/*
 * Med with Spence Visual Learning OS V4
 * Apple-inspired product shell: calm, cinematic and content-first.
 */
:root{
  color-scheme:dark;
  --v3-bg:#050507;
  --v3-bg-soft:#0a0a0e;
  --v3-surface:rgba(24,24,29,.72);
  --v3-surface-strong:rgba(31,31,38,.92);
  --v3-surface-subtle:rgba(255,255,255,.045);
  --v3-line:rgba(255,255,255,.085);
  --v3-line-strong:rgba(255,255,255,.15);
  --v3-text:#f5f5f7;
  --v3-muted:#a1a1aa;
  --v3-muted-2:#73737d;
  --v3-blue:#0a84ff;
  --v3-blue-2:#64d2ff;
  --v3-purple:#bf5af2;
  --v3-indigo:#5e5ce6;
  --v3-green:#30d158;
  --v3-orange:#ff9f0a;
  --v3-red:#ff453a;
  --v3-radius-xs:12px;
  --v3-radius-sm:16px;
  --v3-radius:22px;
  --v3-radius-lg:30px;
  --v3-radius-xl:38px;
  --v3-shadow:0 28px 90px rgba(0,0,0,.44);
  --v3-shadow-soft:0 16px 48px rgba(0,0,0,.24);
  --v3-sidebar:252px;
  --v3-topbar:76px;
  --v3-max:1640px;
}

html{font-family:-apple-system,BlinkMacSystemFont,"SF Pro Display","SF Pro Text",Inter,"Segoe UI",sans-serif;background:var(--v3-bg)}
body{
  color:var(--v3-text);
  background:
    radial-gradient(900px 600px at 16% -12%,rgba(10,132,255,.12),transparent 62%),
    radial-gradient(780px 520px at 91% 4%,rgba(191,90,242,.09),transparent 64%),
    linear-gradient(180deg,#050507 0%,#08080b 42%,#050507 100%);
}
body::before{
  background:linear-gradient(180deg,rgba(255,255,255,.018),transparent 34%);
  mask-image:none;
}
::selection{background:rgba(10,132,255,.35);color:#fff}
:focus-visible{outline:3px solid rgba(100,210,255,.62);outline-offset:3px}

.glass-panel{
  background:linear-gradient(180deg,rgba(255,255,255,.075),rgba(255,255,255,.035));
  border:1px solid var(--v3-line);
  box-shadow:var(--v3-shadow-soft);
  backdrop-filter:blur(30px) saturate(140%);
  -webkit-backdrop-filter:blur(30px) saturate(140%);
}
.eyebrow{
  color:var(--v3-blue-2);
  font-size:.72rem;
  font-weight:750;
  letter-spacing:.095em;
  text-transform:uppercase;
}
.button{
  min-height:46px;
  padding:0 18px;
  border-radius:999px;
  border:1px solid var(--v3-line);
  background:rgba(255,255,255,.065);
  color:var(--v3-text);
  font-weight:650;
  letter-spacing:-.01em;
  box-shadow:none;
  transition:transform .22s cubic-bezier(.2,.8,.2,1),background .22s,border-color .22s,box-shadow .22s;
}
.button:hover{transform:translateY(-1px);background:rgba(255,255,255,.095);border-color:var(--v3-line-strong)}
.button.primary{
  color:#fff;
  background:linear-gradient(135deg,var(--v3-blue),#3478f6 56%,var(--v3-indigo));
  border-color:transparent;
  box-shadow:0 12px 34px rgba(10,132,255,.28),inset 0 1px rgba(255,255,255,.22);
}
.button.primary:hover{box-shadow:0 16px 42px rgba(10,132,255,.36),inset 0 1px rgba(255,255,255,.26)}
.button.secondary{background:rgba(255,255,255,.075)}
.button.ghost{background:transparent}
.button.compact{min-height:38px;padding:0 14px;font-size:.82rem}
.icon-button{
  width:42px;height:42px;border-radius:50%;
  background:rgba(255,255,255,.06);border:1px solid var(--v3-line);
  transition:background .2s,transform .2s,border-color .2s;
}
.icon-button:hover{background:rgba(255,255,255,.11);transform:scale(1.03)}
.icon-button svg,.button svg,.nav-item svg,.mobile-tabs svg,.collection-icon svg,.metric-icon svg{width:20px;height:20px;display:block}
.text-button{color:var(--v3-blue-2);font-weight:650;letter-spacing:-.01em}

/* Public learning portal */
body.auth-body{min-height:100vh;overflow-x:hidden}
.portal-shell{min-height:100vh;position:relative;isolation:isolate;overflow:hidden}
.portal-shell::before,.portal-shell::after{content:"";position:absolute;border-radius:50%;filter:blur(2px);pointer-events:none;z-index:-1}
.portal-shell::before{width:720px;height:720px;left:-360px;top:-290px;background:radial-gradient(circle,rgba(10,132,255,.22),transparent 67%)}
.portal-shell::after{width:680px;height:680px;right:-330px;top:80px;background:radial-gradient(circle,rgba(191,90,242,.16),transparent 68%)}
.portal-nav{height:84px;display:flex;align-items:center;justify-content:space-between;max-width:1500px;margin:0 auto;padding:0 38px;position:relative;z-index:5}
.portal-brand{display:flex;align-items:center;gap:15px}
.portal-brand img{width:188px;height:auto}
.portal-brand span{padding-left:14px;border-left:1px solid var(--v3-line);font-size:.76rem;color:var(--v3-muted);letter-spacing:.05em;text-transform:uppercase}
.portal-nav-links{display:flex;align-items:center;gap:24px;color:#c7c7ce;font-size:.88rem}
.portal-nav-links a:hover{color:#fff}
.portal-support-pill{display:flex;align-items:center;gap:8px;padding:10px 14px;border:1px solid var(--v3-line);border-radius:999px;background:rgba(255,255,255,.035)}
.portal-main{max-width:1500px;margin:0 auto;padding:54px 38px 70px;display:grid;grid-template-columns:minmax(0,1.02fr) minmax(420px,.72fr);gap:72px;align-items:center;min-height:calc(100vh - 84px)}
.portal-story{min-width:0}
.portal-kicker{display:inline-flex;align-items:center;gap:9px;padding:9px 13px;border-radius:999px;background:rgba(10,132,255,.11);border:1px solid rgba(100,210,255,.2);color:#b7e7ff;font-size:.76rem;font-weight:680}
.portal-kicker i{width:7px;height:7px;border-radius:50%;background:var(--v3-blue-2);box-shadow:0 0 18px var(--v3-blue-2)}
.portal-story h1{font-size:clamp(4.2rem,7.6vw,8.2rem);line-height:.87;letter-spacing:-.078em;margin:30px 0 26px;max-width:990px;font-weight:740}
.portal-story h1 em{font-style:normal;background:linear-gradient(115deg,#fff 4%,#91d8ff 40%,#c99aff 82%);-webkit-background-clip:text;background-clip:text;color:transparent}
.portal-lead{font-size:clamp(1.1rem,1.7vw,1.42rem);line-height:1.55;color:#b6b6bf;max-width:750px;letter-spacing:-.02em;margin:0}
.portal-proof-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:34px;max-width:760px}
.portal-proof{padding:16px 17px;border-radius:18px;background:rgba(255,255,255,.04);border:1px solid var(--v3-line)}
.portal-proof strong{display:block;font-size:1.12rem;color:#fff;margin-bottom:3px;letter-spacing:-.025em}
.portal-proof span{font-size:.76rem;color:var(--v3-muted);line-height:1.35}
.portal-showcase{position:relative;height:330px;margin:44px 0 0;perspective:1100px;max-width:820px}
.portal-slide{position:absolute;width:min(570px,72vw);aspect-ratio:16/9;border-radius:22px;overflow:hidden;border:1px solid rgba(255,255,255,.16);box-shadow:0 36px 95px rgba(0,0,0,.58);background:#111;transform-origin:center;transition:transform .4s ease}
.portal-slide img{width:100%;height:100%;object-fit:cover}
.portal-slide:nth-child(1){left:0;top:38px;transform:rotateY(11deg) rotateZ(-3deg) scale(.92);opacity:.7}
.portal-slide:nth-child(2){left:12%;top:18px;transform:rotateY(5deg) rotateZ(-1deg) scale(.97);opacity:.88}
.portal-slide:nth-child(3){left:23%;top:0;transform:translateZ(30px);z-index:3}
.portal-slide::after{content:"";position:absolute;inset:0;background:linear-gradient(135deg,rgba(255,255,255,.16),transparent 30%);pointer-events:none}
.portal-auth-card{padding:34px;border-radius:34px;background:rgba(18,18,23,.78);border:1px solid rgba(255,255,255,.12);box-shadow:0 42px 120px rgba(0,0,0,.48);backdrop-filter:blur(34px) saturate(145%);position:relative;overflow:hidden}
.portal-auth-card::before{content:"";position:absolute;inset:0 0 auto;height:1px;background:linear-gradient(90deg,transparent,rgba(255,255,255,.55),transparent)}
.portal-auth-card .mini-logo{display:none}
.portal-auth-header{display:flex;align-items:flex-start;justify-content:space-between;gap:20px;margin-bottom:28px}
.portal-auth-header h2{margin:7px 0 0;font-size:2rem;letter-spacing:-.045em}
.portal-auth-header p{margin:8px 0 0;color:var(--v3-muted);font-size:.91rem;line-height:1.5}
.security-orb{width:48px;height:48px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(145deg,rgba(100,210,255,.18),rgba(94,92,230,.16));border:1px solid rgba(100,210,255,.2);color:#c8eeff;flex:0 0 auto}
.security-orb svg{width:22px;height:22px}
.portal-auth-card .auth-form{gap:15px}
.portal-auth-card .field>span{color:#cfcfd6;font-size:.78rem;font-weight:620}
.portal-auth-card .input-shell{border-radius:15px;background:rgba(0,0,0,.28);border-color:rgba(255,255,255,.1);padding:0 14px}
.portal-auth-card .input-shell:focus-within{border-color:rgba(100,210,255,.55);box-shadow:0 0 0 4px rgba(10,132,255,.11)}
.portal-auth-card .input-shell input{min-height:54px}
.portal-auth-card .button.primary{width:100%;min-height:52px;margin-top:2px}
.portal-auth-card .form-meta{margin-top:-3px}
.portal-auth-card .auth-support{margin-top:22px;font-size:.78rem}
.portal-auth-card .auth-status{border-radius:14px}
.portal-access-note{display:flex;align-items:center;gap:10px;margin-top:18px;color:#898992;font-size:.75rem;line-height:1.45}
.portal-access-note svg{width:17px;height:17px;color:var(--v3-green);flex:0 0 auto}
.portal-footer{max-width:1500px;margin:-42px auto 0;padding:0 38px 30px;display:flex;justify-content:space-between;color:#66666f;font-size:.72rem}

/* Application shell */
.app-layout{min-height:100vh;display:grid;grid-template-columns:var(--v3-sidebar) minmax(0,1fr)}
.sidebar{
  width:var(--v3-sidebar);padding:22px 17px 18px;position:fixed;inset:0 auto 0 0;z-index:55;
  display:flex;flex-direction:column;
  background:rgba(9,9,12,.78);border-right:1px solid var(--v3-line);
  backdrop-filter:blur(34px) saturate(145%);-webkit-backdrop-filter:blur(34px) saturate(145%);
}
.app-brand{display:flex;flex-direction:column;align-items:flex-start;gap:11px;padding:6px 12px 24px}
.app-brand img{width:178px}
.app-brand span{font-size:.68rem;color:#73737d;text-transform:uppercase;letter-spacing:.115em;font-weight:650}
.app-brand b{color:var(--v3-blue-2);font-weight:750}
.side-nav{display:grid;gap:5px}
.nav-item{
  min-height:48px;border:0;border-radius:14px;padding:0 13px;display:flex;align-items:center;gap:13px;
  background:transparent;color:#9c9ca6;text-align:left;font-size:.9rem;font-weight:580;
  transition:background .2s,color .2s,transform .2s;
}
.nav-item:hover{color:#fff;background:rgba(255,255,255,.055)}
.nav-item.active{color:#fff;background:linear-gradient(135deg,rgba(10,132,255,.21),rgba(94,92,230,.12));box-shadow:inset 0 0 0 1px rgba(100,210,255,.11)}
.nav-item.active svg{color:var(--v3-blue-2)}
.nav-item span{width:22px;display:grid;place-items:center;color:#8d8d98}
.nav-item b{font-weight:600}
.sidebar-learning-card{margin-top:auto;padding:16px;border:1px solid var(--v3-line);border-radius:20px;background:linear-gradient(150deg,rgba(10,132,255,.12),rgba(191,90,242,.06));overflow:hidden;position:relative}
.sidebar-learning-card::after{content:"";position:absolute;width:120px;height:120px;border-radius:50%;right:-55px;top:-55px;background:rgba(100,210,255,.12);filter:blur(12px)}
.sidebar-learning-card strong{display:block;font-size:.9rem;letter-spacing:-.02em;margin-bottom:5px;position:relative;z-index:1}
.sidebar-learning-card p{margin:0;color:#8f8f99;font-size:.72rem;line-height:1.45;position:relative;z-index:1}
.sidebar-footer{margin-top:12px;padding:12px 7px 0;border-top:0}
.sync-pill{display:flex;align-items:center;gap:8px;color:#85858e;font-size:.7rem}
.sync-pill>span{width:7px;height:7px;border-radius:50%;background:var(--v3-green);box-shadow:0 0 12px rgba(48,209,88,.72)}
.sync-pill b{font-weight:550}
.sidebar-footer p{font-size:.62rem;color:#55555e;margin:9px 0 0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.main-column{grid-column:2;min-width:0;min-height:100vh}
.topbar{
  position:sticky;top:0;z-index:45;height:var(--v3-topbar);padding:0 clamp(20px,3vw,46px);
  display:flex;align-items:center;gap:18px;background:rgba(5,5,7,.68);border-bottom:1px solid rgba(255,255,255,.06);
  backdrop-filter:blur(28px) saturate(150%);-webkit-backdrop-filter:blur(28px) saturate(150%);
}
.topbar-context{display:flex;flex-direction:column;min-width:max-content}
.topbar-context small{color:#666671;font-size:.65rem;text-transform:uppercase;letter-spacing:.11em;font-weight:650}
.topbar-context b{font-size:.91rem;font-weight:610;letter-spacing:-.02em;margin-top:2px}
.global-search{width:min(640px,48vw);margin:0 auto;position:relative;display:flex;align-items:center}
.global-search>span{position:absolute;left:15px;color:#83838d;display:grid;z-index:1}
.global-search>span svg{width:18px;height:18px}
.global-search input{width:100%;height:43px;padding:0 78px 0 43px;border-radius:13px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.075);color:#fff;outline:0;transition:background .2s,border-color .2s,box-shadow .2s}
.global-search input::placeholder{color:#74747e}
.global-search input:focus{background:rgba(255,255,255,.085);border-color:rgba(100,210,255,.32);box-shadow:0 0 0 4px rgba(10,132,255,.08)}
.search-shortcut{position:absolute;right:10px;display:flex;align-items:center;gap:4px;color:#73737e;font-size:.66rem;padding:4px 7px;border-radius:7px;background:rgba(0,0,0,.26);border:1px solid var(--v3-line)}
.search-popover{position:absolute;top:51px;left:0;right:0;padding:9px;border-radius:20px;background:rgba(24,24,29,.97);border:1px solid var(--v3-line-strong);box-shadow:0 24px 80px rgba(0,0,0,.52);backdrop-filter:blur(30px);z-index:110;max-height:min(520px,72vh);overflow:auto}
.search-popover-head{display:flex;justify-content:space-between;padding:8px 10px 10px;color:#777782;font-size:.68rem;text-transform:uppercase;letter-spacing:.09em}
.search-result{width:100%;display:grid;grid-template-columns:82px minmax(0,1fr) auto;gap:13px;align-items:center;padding:9px;border:0;border-radius:14px;background:transparent;text-align:left;color:#fff}
.search-result:hover,.search-result.active{background:rgba(255,255,255,.065)}
.search-result img{width:82px;aspect-ratio:16/9;object-fit:cover;border-radius:9px;border:1px solid var(--v3-line)}
.search-result b{display:block;font-size:.83rem;letter-spacing:-.02em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.search-result small{display:block;margin-top:3px;color:#7f7f89;font-size:.67rem}
.search-result>span{color:#666671;font-size:.68rem}
.search-empty{padding:26px;text-align:center;color:#8f8f99;font-size:.84rem}
.profile-button{border:0;background:transparent;display:flex;align-items:center;gap:10px;padding:5px;border-radius:999px;text-align:left}
.profile-button:hover{background:rgba(255,255,255,.05)}
.profile-avatar{width:37px;height:37px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(145deg,var(--v3-blue),var(--v3-purple));color:#fff;font-weight:720;box-shadow:inset 0 1px rgba(255,255,255,.24)}
.profile-button div{max-width:160px}
.profile-button b{display:block;font-size:.78rem;font-weight:620;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.profile-button small{display:block;color:#696973;font-size:.64rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-top:2px}
.mobile-menu{display:none}
.mobile-tabs{display:none}
.sidebar-scrim{display:none}
.main-content{width:min(var(--v3-max),100%);margin:0 auto;padding:clamp(28px,3.5vw,54px) clamp(20px,3.3vw,52px) 76px}

/* Headings and shared dashboard surfaces */
.page-head{display:flex;align-items:flex-end;justify-content:space-between;gap:28px;margin:0 0 30px}
.page-head h1,.section-heading h2{letter-spacing:-.052em;line-height:1.02}
.page-head h1{font-size:clamp(2.55rem,5vw,5.2rem);margin:9px 0 12px;font-weight:700}
.page-head p{margin:0;color:var(--v3-muted);font-size:1rem;line-height:1.6;max-width:710px}
.section-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin:48px 0 20px}
.section-heading h2{font-size:clamp(1.8rem,3vw,3rem);margin:7px 0 0;font-weight:680}
.section-heading .section-copy{color:var(--v3-muted);font-size:.86rem;margin:8px 0 0}
.segmented-control,.course-switch{display:flex;align-items:center;gap:3px;padding:4px;border-radius:12px;background:rgba(255,255,255,.06);border:1px solid var(--v3-line)}
.segmented-control button,.course-switch button{height:34px;padding:0 14px;border:0;border-radius:9px;background:transparent;color:#898994;font-size:.76rem;font-weight:620}
.segmented-control button.active,.course-switch button.active{background:rgba(255,255,255,.11);color:#fff;box-shadow:0 2px 10px rgba(0,0,0,.2)}

/* Home */
.v3-hero{
  min-height:430px;border-radius:var(--v3-radius-xl);padding:clamp(28px,4vw,54px);
  position:relative;overflow:hidden;display:grid;grid-template-columns:minmax(0,1.05fr) minmax(340px,.75fr);gap:40px;align-items:center;
  background:
    radial-gradient(680px 360px at 82% 16%,rgba(100,210,255,.13),transparent 65%),
    radial-gradient(560px 360px at 12% 100%,rgba(94,92,230,.16),transparent 70%),
    linear-gradient(145deg,rgba(32,32,39,.9),rgba(13,13,17,.84));
  border:1px solid rgba(255,255,255,.11);box-shadow:var(--v3-shadow);
}
.v3-hero::before{content:"";position:absolute;inset:0;background:linear-gradient(110deg,rgba(255,255,255,.055),transparent 38%);pointer-events:none}
.hero-copy{position:relative;z-index:2;max-width:790px}
.hero-greeting{display:flex;align-items:center;gap:9px;color:#a6a6b0;font-size:.82rem}
.hero-greeting i{width:7px;height:7px;border-radius:50%;background:var(--v3-green);box-shadow:0 0 14px rgba(48,209,88,.75)}
.hero-copy h1{font-size:clamp(3.25rem,6vw,6.5rem);letter-spacing:-.075em;line-height:.9;margin:20px 0 22px;font-weight:720}
.hero-copy h1 span{display:block;color:#8d8d98;font-weight:600}
.hero-copy p{font-size:1.08rem;color:#aaaab4;line-height:1.58;max-width:620px;margin:0}
.hero-actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-top:29px}
.hero-actions .button{min-height:50px;padding:0 22px}
.hero-microcopy{display:flex;align-items:center;gap:18px;margin-top:24px;color:#74747e;font-size:.72rem}
.hero-microcopy span{display:flex;align-items:center;gap:6px}
.hero-microcopy svg{width:15px;height:15px;color:#8dcfff}
.hero-visual{position:relative;min-height:310px;display:grid;place-items:center;z-index:1}
.hero-slide-stack{position:absolute;inset:0;display:grid;place-items:center;perspective:1200px}
.hero-slide-card{position:absolute;width:min(520px,95%);aspect-ratio:16/9;border-radius:19px;overflow:hidden;border:1px solid rgba(255,255,255,.13);box-shadow:0 30px 80px rgba(0,0,0,.52);background:#101014}
.hero-slide-card img{width:100%;height:100%;object-fit:cover}
.hero-slide-card.back{transform:translate(32px,-25px) rotate(4deg) scale(.91);opacity:.38;filter:saturate(.75)}
.hero-slide-card.mid{transform:translate(15px,-10px) rotate(2deg) scale(.96);opacity:.66}
.hero-slide-card.front{transform:translate(-5px,12px);z-index:3}
.hero-slide-card.front::after{content:"";position:absolute;inset:0;background:linear-gradient(135deg,rgba(255,255,255,.09),transparent 32%);pointer-events:none}
.hero-progress-pill{position:absolute;right:-5px;bottom:-4px;z-index:5;display:flex;align-items:center;gap:13px;padding:13px 16px;border-radius:18px;background:rgba(31,31,37,.86);border:1px solid var(--v3-line-strong);box-shadow:0 18px 50px rgba(0,0,0,.42);backdrop-filter:blur(24px)}
.hero-progress-pill strong{font-size:1.35rem;letter-spacing:-.04em}
.hero-progress-pill span{font-size:.68rem;color:#8e8e98;line-height:1.25}
.mini-progress-ring{--ring:0deg;width:44px;height:44px;border-radius:50%;background:conic-gradient(var(--v3-blue-2) var(--ring),rgba(255,255,255,.08) 0);display:grid;place-items:center}
.mini-progress-ring::after{content:"";width:34px;height:34px;border-radius:50%;background:#18181d}

.momentum-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin-top:16px}
.momentum-card{min-height:126px;padding:20px;border-radius:23px;background:rgba(255,255,255,.04);border:1px solid var(--v3-line);display:flex;flex-direction:column;justify-content:space-between;transition:transform .22s,background .22s,border-color .22s}
.momentum-card:hover{transform:translateY(-2px);background:rgba(255,255,255,.055);border-color:var(--v3-line-strong)}
.momentum-top{display:flex;align-items:center;justify-content:space-between;gap:12px;color:#777781}
.metric-icon{width:35px;height:35px;border-radius:11px;display:grid;place-items:center;background:rgba(10,132,255,.11);color:#8fd7ff}
.metric-icon.purple{background:rgba(191,90,242,.11);color:#d4a0f5}
.metric-icon.green{background:rgba(48,209,88,.1);color:#73e48d}
.metric-icon.orange{background:rgba(255,159,10,.1);color:#ffc05c}
.momentum-card strong{font-size:2rem;letter-spacing:-.055em;font-weight:680}
.momentum-card b{font-size:.78rem;font-weight:590;color:#a1a1ab}
.momentum-card small{color:#676771;font-size:.68rem}
.daily-goal-track{height:5px;border-radius:999px;background:rgba(255,255,255,.07);overflow:hidden;margin-top:10px}
.daily-goal-track i{display:block;height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--v3-blue),var(--v3-blue-2));box-shadow:0 0 12px rgba(100,210,255,.35)}

.collections-row{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:12px}
.collection-card{min-height:154px;padding:21px;border-radius:24px;border:1px solid var(--v3-line);background:linear-gradient(150deg,rgba(255,255,255,.055),rgba(255,255,255,.025));text-align:left;color:#fff;position:relative;overflow:hidden;transition:transform .22s,border-color .22s,background .22s}
.collection-card:hover{transform:translateY(-3px);border-color:rgba(255,255,255,.17);background:linear-gradient(150deg,rgba(255,255,255,.075),rgba(255,255,255,.035))}
.collection-card::after{content:"";position:absolute;width:120px;height:120px;border-radius:50%;right:-50px;bottom:-65px;background:var(--collection-glow,rgba(10,132,255,.13));filter:blur(9px)}
.collection-icon{width:42px;height:42px;border-radius:14px;display:grid;place-items:center;background:rgba(255,255,255,.06);color:var(--collection-colour,#8fd7ff);margin-bottom:22px}
.collection-card strong{display:block;font-size:1rem;letter-spacing:-.025em;position:relative;z-index:1}
.collection-card span{display:block;margin-top:5px;color:#777781;font-size:.72rem;position:relative;z-index:1}
.collection-count{position:absolute;right:17px;top:17px;padding:5px 8px;border-radius:999px;background:rgba(255,255,255,.055);font-size:.67rem;color:#9a9aa4}

.home-content-grid{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(300px,.65fr);gap:14px}
.resume-card{border-radius:28px;padding:20px;display:grid;grid-template-columns:minmax(230px,.92fr) minmax(0,1.08fr);gap:24px;align-items:center;background:rgba(255,255,255,.04);border:1px solid var(--v3-line)}
.resume-image{aspect-ratio:16/9;border-radius:18px;overflow:hidden;border:1px solid var(--v3-line);box-shadow:0 15px 40px rgba(0,0,0,.3);position:relative}
.resume-image img{width:100%;height:100%;object-fit:cover}
.resume-image span{position:absolute;left:12px;top:12px;padding:6px 9px;border-radius:999px;background:rgba(0,0,0,.72);backdrop-filter:blur(12px);font-size:.65rem;font-weight:670}
.resume-copy small{color:var(--v3-blue-2);font-size:.67rem;text-transform:uppercase;letter-spacing:.085em;font-weight:660}
.resume-copy h3{font-size:clamp(1.35rem,2vw,2rem);letter-spacing:-.04em;margin:9px 0 10px}
.resume-copy p{color:#80808a;font-size:.82rem;line-height:1.5;margin:0 0 19px}
.smart-queue-card{border-radius:28px;padding:24px;background:linear-gradient(155deg,rgba(94,92,230,.11),rgba(255,255,255,.035));border:1px solid var(--v3-line);display:flex;flex-direction:column;min-height:100%}
.smart-queue-head{display:flex;align-items:center;justify-content:space-between;gap:12px}
.smart-queue-head .metric-icon{width:42px;height:42px;border-radius:14px}
.smart-queue-card h3{font-size:1.42rem;letter-spacing:-.04em;margin:22px 0 8px}
.smart-queue-card p{color:#85858f;font-size:.81rem;line-height:1.5;margin:0}
.queue-preview{display:flex;margin:22px 0 21px}
.queue-preview img{width:88px;aspect-ratio:16/9;object-fit:cover;border-radius:9px;border:1px solid rgba(255,255,255,.16);box-shadow:0 8px 22px rgba(0,0,0,.3)}
.queue-preview img+img{margin-left:-22px}
.smart-queue-card .button{margin-top:auto;align-self:flex-start}
.course-grid.v3-course-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.v3-course-card{min-height:260px;border-radius:29px;padding:27px;position:relative;overflow:hidden;border:1px solid var(--v3-line);background:linear-gradient(145deg,rgba(255,255,255,.06),rgba(255,255,255,.025));display:flex;flex-direction:column}
.v3-course-card::before{content:"";position:absolute;width:260px;height:260px;right:-125px;top:-125px;border-radius:50%;background:var(--course-glow);filter:blur(2px);opacity:.85}
.v3-course-card>*{position:relative;z-index:1}
.v3-course-top{display:flex;justify-content:space-between;align-items:center;color:#85858f;font-size:.7rem}
.course-access{display:flex;align-items:center;gap:7px}
.course-access i{width:6px;height:6px;border-radius:50%;background:var(--v3-green)}
.v3-course-card h3{font-size:2.1rem;letter-spacing:-.055em;margin:38px 0 8px}
.v3-course-card p{color:#868690;margin:0;font-size:.86rem}
.v3-course-progress{margin-top:auto;padding-top:32px}
.v3-course-progress-head{display:flex;justify-content:space-between;font-size:.72rem;color:#85858f;margin-bottom:9px}
.v3-course-progress-head strong{color:#d9d9df;font-weight:620}
.v3-course-progress>div{height:5px;border-radius:999px;background:rgba(255,255,255,.07);overflow:hidden}
.v3-course-progress i{display:block;height:100%;background:linear-gradient(90deg,var(--course-colour),rgba(255,255,255,.76));border-radius:inherit}
.v3-course-card .course-open{position:absolute;right:24px;bottom:24px;width:42px;height:42px;border-radius:50%;border:1px solid var(--v3-line);background:rgba(255,255,255,.06);display:grid;place-items:center}
.v3-course-card .course-open svg{width:18px;height:18px}
.recommendation-row{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}

/* Library and topic cards */
.library-command-bar{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:16px}
.smart-presets{display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.preset-chip{height:38px;padding:0 14px;border-radius:999px;border:1px solid var(--v3-line);background:rgba(255,255,255,.035);color:#8d8d97;font-size:.74rem;font-weight:590;display:flex;align-items:center;gap:7px}
.preset-chip:hover{background:rgba(255,255,255,.065);color:#fff}
.preset-chip.active{background:rgba(10,132,255,.15);color:#ccecff;border-color:rgba(100,210,255,.22)}
.preset-chip span{font-size:.66rem;color:#666671;padding-left:2px}
.library-view-toggle{display:flex;gap:3px;padding:4px;background:rgba(255,255,255,.05);border:1px solid var(--v3-line);border-radius:12px}
.library-view-toggle button{width:34px;height:31px;border:0;border-radius:8px;background:transparent;color:#70707a;display:grid;place-items:center}
.library-view-toggle button.active{background:rgba(255,255,255,.1);color:#fff}
.library-view-toggle svg{width:16px;height:16px}
.filter-bar.v3-filter-bar{display:grid;grid-template-columns:repeat(4,minmax(150px,1fr)) auto;gap:9px;align-items:center;padding:10px;border-radius:19px;background:rgba(255,255,255,.035);border:1px solid var(--v3-line);margin:0 0 20px;box-shadow:none}
.filter-bar.v3-filter-bar select{height:42px;border-radius:12px;border:1px solid rgba(255,255,255,.07);background:#131318;color:#c8c8cf;padding:0 35px 0 12px;font-size:.75rem;outline:0}
.filter-result-count{padding:0 12px;color:#74747e;font-size:.72rem;white-space:nowrap}
.filter-result-count b{color:#fff;font-size:.92rem;margin-right:3px}
.library-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:15px}
.topic-tile{border-radius:22px;overflow:hidden;background:rgba(255,255,255,.035);border:1px solid var(--v3-line);transition:transform .24s cubic-bezier(.2,.8,.2,1),border-color .24s,background .24s,box-shadow .24s;cursor:pointer;min-width:0;position:relative}
.topic-tile:hover{transform:translateY(-4px);border-color:rgba(255,255,255,.18);background:rgba(255,255,255,.052);box-shadow:0 20px 48px rgba(0,0,0,.29)}
.topic-image{position:relative;aspect-ratio:16/9;background:#111;overflow:hidden;border-bottom:1px solid rgba(255,255,255,.06)}
.topic-image::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 55%,rgba(0,0,0,.28));pointer-events:none}
.topic-image img{width:100%;height:100%;object-fit:cover;transition:transform .42s cubic-bezier(.2,.8,.2,1)}
.topic-tile:hover .topic-image img{transform:scale(1.025)}
.tier-pill{position:absolute;left:11px;top:11px;z-index:2;padding:6px 9px;border-radius:999px;background:rgba(5,5,7,.78);border:1px solid rgba(255,255,255,.13);backdrop-filter:blur(14px);font-size:.62rem;font-weight:710;color:#fff}
.confidence-badge{position:absolute;left:11px;bottom:10px;z-index:2;font-style:normal;padding:5px 8px;border-radius:999px;background:rgba(5,5,7,.78);border:1px solid var(--v3-line);backdrop-filter:blur(12px);font-size:.59rem;text-transform:capitalize}
.confidence-badge[data-confidence="again"]{color:#ff8f87;border-color:rgba(255,69,58,.25)}
.confidence-badge[data-confidence="hard"]{color:#ffc66a;border-color:rgba(255,159,10,.25)}
.confidence-badge[data-confidence="good"]{color:#85d6ff;border-color:rgba(100,210,255,.25)}
.confidence-badge[data-confidence="easy"]{color:#7ee595;border-color:rgba(48,209,88,.25)}
.bookmark-button{position:absolute;right:10px;top:10px;z-index:3;width:34px;height:34px;border-radius:50%;border:1px solid rgba(255,255,255,.12);background:rgba(5,5,7,.72);color:#d0d0d6;display:grid;place-items:center;backdrop-filter:blur(14px);font-size:0}
.bookmark-button svg{width:17px;height:17px}
.bookmark-button.active{color:#fff;background:rgba(10,132,255,.83);border-color:transparent}
.topic-copy{padding:15px 16px 16px}
.topic-copy>small{display:block;color:#70707a;font-size:.61rem;text-transform:uppercase;letter-spacing:.075em;font-weight:630;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.topic-copy h3{font-size:.98rem;line-height:1.24;letter-spacing:-.025em;margin:8px 0 15px;min-height:2.42em;font-weight:630}
.topic-meta{display:flex;align-items:center;justify-content:space-between;gap:12px;color:#666671;font-size:.66rem}
.topic-meta b{color:#aaaab3;font-weight:580}
.topic-completion{position:absolute;left:0;right:0;bottom:0;height:2px;background:transparent}
.topic-tile.complete .topic-completion{background:linear-gradient(90deg,var(--v3-green),#8ff0a5)}
.topic-tile.complete .topic-meta b{color:#7adc90}
.library-grid.list-view{grid-template-columns:1fr;gap:8px}
.library-grid.list-view .topic-tile{display:grid;grid-template-columns:230px minmax(0,1fr);align-items:center;border-radius:18px}
.library-grid.list-view .topic-image{aspect-ratio:16/9;border-bottom:0;border-right:1px solid var(--v3-line)}
.library-grid.list-view .topic-copy{display:grid;grid-template-columns:minmax(0,1fr) auto;grid-template-rows:auto auto;column-gap:24px;align-items:center;padding:16px 21px}
.library-grid.list-view .topic-copy>small{grid-column:1}
.library-grid.list-view .topic-copy h3{grid-column:1;margin:5px 0 0;min-height:0;font-size:1.05rem}
.library-grid.list-view .topic-meta{grid-column:2;grid-row:1/3;display:grid;text-align:right;gap:4px}
.empty-state{grid-column:1/-1;min-height:300px;border:1px dashed rgba(255,255,255,.13);border-radius:26px;display:grid;place-items:center;text-align:center;color:#777781;padding:30px;background:rgba(255,255,255,.02)}
.empty-state div{max-width:390px}
.empty-state svg{width:36px;height:36px;color:#64646e;margin:0 auto 14px}
.empty-state strong{display:block;color:#c9c9d0;font-size:1.05rem;margin-bottom:6px}

/* Sprint */
.sprint-hero.v3-sprint{min-height:390px;border-radius:34px;padding:clamp(28px,4vw,52px);display:grid;grid-template-columns:minmax(0,1fr) minmax(300px,.68fr);gap:35px;align-items:center;position:relative;overflow:hidden;background:linear-gradient(145deg,rgba(27,27,34,.94),rgba(12,12,16,.9));border:1px solid var(--v3-line);box-shadow:var(--v3-shadow-soft)}
.sprint-hero.v3-sprint::after{content:"";position:absolute;width:590px;height:590px;border-radius:50%;right:-260px;top:-310px;background:radial-gradient(circle,rgba(191,90,242,.21),transparent 66%)}
.sprint-copy{position:relative;z-index:1}
.sprint-copy h2{font-size:clamp(2.8rem,5vw,5.4rem);line-height:.92;letter-spacing:-.067em;margin:15px 0 20px}
.sprint-copy p{max-width:650px;color:#a0a0aa;font-size:1rem;line-height:1.58}
.sprint-options{display:flex;gap:8px;flex-wrap:wrap;margin:24px 0}
.sprint-options span{padding:8px 11px;border-radius:999px;background:rgba(255,255,255,.05);border:1px solid var(--v3-line);font-size:.68rem;color:#9999a3}
.sprint-orbit{position:relative;z-index:1;width:250px;height:250px;margin:auto;border-radius:50%;display:grid;place-items:center;background:conic-gradient(from 180deg,var(--v3-purple),var(--v3-blue),var(--v3-blue-2),var(--v3-purple));box-shadow:0 0 80px rgba(94,92,230,.22)}
.sprint-orbit::before{content:"";position:absolute;inset:8px;border-radius:50%;background:#101015}
.sprint-orbit div{position:relative;text-align:center}
.sprint-orbit strong{display:block;font-size:5.5rem;line-height:.8;letter-spacing:-.08em}
.sprint-orbit span{display:block;color:#8d8d97;font-size:.72rem;text-transform:uppercase;letter-spacing:.1em;margin-top:12px}
.sprint-results-head{display:flex;justify-content:space-between;align-items:center;margin:42px 0 18px}

/* Progress */
.progress-overview{display:grid;grid-template-columns:minmax(330px,.8fr) minmax(0,1.2fr);gap:14px;margin-bottom:14px}
.progress-master-card{border-radius:30px;padding:30px;display:flex;align-items:center;gap:30px;background:linear-gradient(145deg,rgba(10,132,255,.1),rgba(255,255,255,.035));border:1px solid var(--v3-line)}
.progress-ring-large{--progress:0deg;width:154px;height:154px;border-radius:50%;background:conic-gradient(var(--v3-blue-2) var(--progress),rgba(255,255,255,.07) 0);display:grid;place-items:center;flex:0 0 auto}
.progress-ring-large::before{content:"";width:132px;height:132px;border-radius:50%;background:#111116}
.progress-ring-copy{position:absolute;text-align:center}
.progress-ring-copy strong{display:block;font-size:2.3rem;letter-spacing:-.06em}
.progress-ring-copy span{font-size:.65rem;color:#777781;text-transform:uppercase;letter-spacing:.08em}
.progress-master-copy h2{font-size:1.65rem;letter-spacing:-.045em;margin:8px 0 9px}
.progress-master-copy p{color:#85858f;font-size:.79rem;line-height:1.5;margin:0}
.progress-stats-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}
.progress-stat{border-radius:24px;padding:22px;background:rgba(255,255,255,.035);border:1px solid var(--v3-line);display:flex;flex-direction:column;justify-content:space-between}
.progress-stat span{color:#73737d;font-size:.7rem}
.progress-stat strong{font-size:2rem;letter-spacing:-.05em;margin-top:20px}
.progress-stat small{color:#666671;font-size:.66rem;margin-top:4px}
.confidence-summary.v3-confidence{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;padding:10px;border-radius:24px;background:rgba(255,255,255,.03);border:1px solid var(--v3-line);margin-bottom:14px}
.confidence-summary.v3-confidence article{padding:19px;border-radius:17px;background:rgba(255,255,255,.025);display:flex;align-items:center;justify-content:space-between}
.confidence-summary.v3-confidence span{text-transform:capitalize;color:#8b8b95;font-size:.75rem}
.confidence-summary.v3-confidence strong{font-size:1.45rem}
.progress-table.v3-progress-table{border-radius:29px;padding:28px;background:rgba(255,255,255,.035);box-shadow:none}
.progress-table.v3-progress-table h2{font-size:1.5rem;letter-spacing:-.04em;margin:0 0 24px}
.progress-line{display:grid;grid-template-columns:180px minmax(0,1fr) 44px;gap:16px;align-items:center;margin:13px 0;color:#8d8d97;font-size:.75rem}
.progress-line>div{height:6px;background:rgba(255,255,255,.06);border-radius:999px;overflow:hidden}
.progress-line i{display:block;height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--v3-blue),var(--v3-blue-2))}
.progress-line b{color:#c7c7cf;text-align:right;font-weight:610}

/* Account */
.account-grid.v3-account-grid{grid-template-columns:minmax(0,.85fr) minmax(0,1.15fr);gap:14px}
.account-card.v3-account{border-radius:30px;padding:30px;background:rgba(255,255,255,.035);box-shadow:none}
.account-profile-head{display:flex;align-items:center;gap:18px;margin-bottom:24px}
.avatar-large{width:72px;height:72px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(145deg,var(--v3-blue),var(--v3-purple));font-size:1.75rem;font-weight:700;box-shadow:inset 0 1px rgba(255,255,255,.25),0 14px 35px rgba(10,132,255,.18)}
.account-profile-head h2{font-size:1.6rem;letter-spacing:-.045em;margin:0 0 5px}
.account-profile-head p{color:#777781;font-size:.78rem;margin:0}
.account-tags{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0 25px}
.account-tags span{padding:7px 10px;border-radius:999px;background:rgba(255,255,255,.045);border:1px solid var(--v3-line);color:#8e8e98;font-size:.66rem}
.preference-list{display:grid;gap:10px;margin-top:20px}
.preference-row{min-height:70px;border-radius:18px;background:rgba(255,255,255,.03);border:1px solid var(--v3-line);padding:14px 16px;display:flex;align-items:center;justify-content:space-between;gap:18px}
.preference-row>div{min-width:0}
.preference-row strong{display:block;font-size:.82rem;font-weight:610}
.preference-row small{display:block;color:#6d6d77;font-size:.68rem;margin-top:4px;line-height:1.35}
.goal-stepper{display:flex;align-items:center;gap:7px}
.goal-stepper button{width:30px;height:30px;border-radius:50%;border:1px solid var(--v3-line);background:rgba(255,255,255,.05);color:#fff}
.goal-stepper b{min-width:38px;text-align:center;font-size:.85rem}
.account-actions{display:flex;gap:9px;flex-wrap:wrap}

/* Immersive slide viewer */
.slide-modal{position:fixed;inset:0;z-index:200;background:#030304}
.slide-modal[hidden]{display:none!important}
.modal-backdrop{position:absolute;inset:0;background:#030304}
.viewer{
  position:absolute;inset:0;display:grid;grid-template-rows:auto auto minmax(0,1fr) auto;
  background:#030304;color:#fff;overflow:hidden;
}
.viewer.focus-mode{grid-template-rows:0 0 minmax(0,1fr) 0}
.viewer.focus-mode .viewer-header,.viewer.focus-mode .viewer-toolbar,.viewer.focus-mode .viewer-footer{opacity:0;pointer-events:none;overflow:hidden;border:0;padding:0;min-height:0}
.viewer-header{min-height:74px;padding:12px 18px 11px 24px;display:flex;align-items:center;justify-content:space-between;gap:20px;background:rgba(16,16,20,.9);border-bottom:1px solid var(--v3-line);backdrop-filter:blur(24px);transition:opacity .2s}
.viewer-title{min-width:0}
.viewer-title span{display:block;color:#78d7ff;font-size:.64rem;text-transform:uppercase;letter-spacing:.095em;font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.viewer-title h2{font-size:1.22rem;letter-spacing:-.035em;margin:5px 0 0;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-weight:640}
.viewer-header-actions{display:flex;align-items:center;gap:7px}
.viewer-header-actions .button{min-height:38px;padding:0 13px;font-size:.75rem}
.viewer-header-actions .icon-button{width:38px;height:38px}
.viewer-toolbar{min-height:54px;padding:7px 16px;display:flex;align-items:center;justify-content:space-between;gap:10px;background:rgba(10,10,13,.94);border-bottom:1px solid var(--v3-line);transition:opacity .2s;overflow-x:auto;scrollbar-width:none}
.viewer-toolbar::-webkit-scrollbar{display:none}
.tool-group{display:flex;align-items:center;gap:5px;min-width:max-content}
.tool-button{height:38px;padding:0 12px;border-radius:10px;border:1px solid rgba(255,255,255,.09);background:rgba(255,255,255,.045);color:#c4c4cb;font-size:.72rem;font-weight:590;display:flex;align-items:center;gap:7px;white-space:nowrap}
.tool-button:hover{background:rgba(255,255,255,.08);color:#fff}
.tool-button.active{background:rgba(10,132,255,.18);border-color:rgba(100,210,255,.28);color:#d5f2ff}
.tool-button.danger{color:#ff928b}
.tool-button svg{width:16px;height:16px}
.tool-divider{width:1px;height:23px;background:var(--v3-line);margin:0 3px}
.zoom-readout{min-width:45px;text-align:center;color:#9bdfff;font-size:.7rem;font-weight:660}
.viewer-annotation-toggle{background:linear-gradient(135deg,rgba(10,132,255,.18),rgba(94,92,230,.13));border-color:rgba(100,210,255,.18)}
.viewer-stage{position:relative;min-height:0;overflow:auto;display:grid;place-items:center;background:
  radial-gradient(800px 360px at 50% 50%,rgba(255,255,255,.025),transparent 68%),
  #020203;overscroll-behavior:contain}
.viewer-stage::-webkit-scrollbar{width:10px;height:10px}
.viewer-stage::-webkit-scrollbar-thumb{background:rgba(255,255,255,.12);border-radius:999px;border:3px solid #020203}
.viewer-transform-space{position:relative;flex:0 0 auto;min-width:1px;min-height:1px}
.viewer-canvas-wrap{position:absolute;left:50%;top:50%;transform-origin:center;box-shadow:0 22px 70px rgba(0,0,0,.58);border-radius:4px;overflow:hidden;background:#000}
.viewer-canvas-wrap img{width:100%;height:100%;object-fit:contain;user-select:none;-webkit-user-drag:none}
#annotation-canvas{position:absolute;inset:0;width:100%;height:100%;touch-action:none;pointer-events:none}
#annotation-canvas[data-active="true"]{pointer-events:auto;cursor:crosshair}
.annotation-palette{position:absolute;z-index:12;top:64px;right:16px;width:310px;padding:14px;border-radius:20px;background:rgba(28,28,34,.94);border:1px solid var(--v3-line-strong);box-shadow:0 24px 70px rgba(0,0,0,.52);backdrop-filter:blur(30px);display:grid;gap:11px;transform-origin:top right;animation:palette-in .18s ease-out}
.annotation-palette[hidden]{display:none!important}
@keyframes palette-in{from{opacity:0;transform:translateY(-6px) scale(.97)}to{opacity:1;transform:none}}
.palette-head{display:flex;align-items:center;justify-content:space-between;gap:12px}
.palette-head strong{font-size:.79rem}
.palette-head small{color:#6e6e78;font-size:.62rem}
.palette-tools{display:grid;grid-template-columns:repeat(3,1fr);gap:6px}
.palette-tools .tool-button{justify-content:center;padding:0 7px}
.palette-controls{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.colour-control,.size-control{min-height:48px;border-radius:13px;padding:8px 10px;background:rgba(255,255,255,.045);border:1px solid var(--v3-line);display:flex;align-items:center;justify-content:space-between;gap:9px;color:#8d8d97;font-size:.66rem}
.colour-control input{width:27px;height:27px;border:0;background:transparent;padding:0;border-radius:50%;overflow:hidden}
.size-control input{width:90px;accent-color:var(--v3-blue)}
.palette-actions{display:grid;grid-template-columns:repeat(3,1fr);gap:6px}
.palette-actions .tool-button{justify-content:center;padding:0 6px;font-size:.66rem}
.focus-exit{position:absolute;right:17px;top:17px;z-index:25;display:none;align-items:center;gap:8px;padding:9px 13px;border-radius:999px;border:1px solid var(--v3-line-strong);background:rgba(18,18,23,.78);backdrop-filter:blur(20px);font-size:.7rem;color:#d0d0d6}
.viewer.focus-mode .focus-exit{display:flex}
.viewer-footer{min-height:108px;padding:10px 18px 12px;background:rgba(13,13,17,.94);border-top:1px solid var(--v3-line);transition:opacity .2s;overflow:auto}
.viewer-footer-grid{display:grid;grid-template-columns:minmax(225px,.75fr) minmax(350px,1.25fr) minmax(260px,.8fr);gap:16px;align-items:center}
.viewer-actions{display:flex;gap:7px}
.viewer-actions .button{min-height:40px;padding:0 14px;font-size:.72rem}
.confidence-control{text-align:center}
.confidence-control>span{display:block;color:#70707a;text-transform:uppercase;letter-spacing:.085em;font-size:.59rem;font-weight:670;margin-bottom:6px}
.confidence-control>div{display:inline-flex;padding:3px;border-radius:12px;background:rgba(255,255,255,.045);border:1px solid var(--v3-line)}
.confidence-button{height:32px;padding:0 10px;border:0;border-radius:9px;background:transparent;color:#85858f;font-size:.67rem;display:flex;align-items:center;gap:5px}
.confidence-button.active{background:rgba(255,255,255,.1);color:#fff}
.confidence-button[data-confidence-value="again"].active{color:#ff9b95;background:rgba(255,69,58,.12)}
.confidence-button[data-confidence-value="hard"].active{color:#ffc66a;background:rgba(255,159,10,.12)}
.confidence-button[data-confidence-value="good"].active{color:#9cddff;background:rgba(100,210,255,.12)}
.confidence-button[data-confidence-value="easy"].active{color:#8aeba0;background:rgba(48,209,88,.12)}
.viewer-navigation{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:8px}
.viewer-navigation .button{min-height:38px;padding:0 12px;font-size:.7rem}
.viewer-navigation>span{text-align:center;color:#777781;font-size:.65rem;white-space:nowrap}
.slide-notes{margin-top:8px;border-top:1px solid rgba(255,255,255,.055);padding-top:7px}
.slide-notes summary{cursor:pointer;color:#a7a7b0;font-size:.68rem;display:flex;align-items:center;gap:8px;list-style:none}
.slide-notes summary::-webkit-details-marker{display:none}
.slide-notes summary::before{content:"+";color:var(--v3-blue-2)}
.slide-notes[open] summary::before{content:"−"}
.slide-notes summary span{color:#62626c}
.slide-notes textarea{width:100%;min-height:66px;margin-top:8px;border-radius:13px;border:1px solid var(--v3-line);background:#08080b;color:#fff;padding:10px 12px;resize:vertical;outline:0;font-size:.75rem}
.viewer-shortcuts{display:block;text-align:center;color:#4f4f58;font-size:.56rem;margin-top:6px}
.toast{position:fixed;z-index:500;right:22px;bottom:22px;padding:13px 17px;border-radius:15px;background:rgba(32,32,38,.94);border:1px solid var(--v3-line-strong);box-shadow:0 22px 55px rgba(0,0,0,.45);font-size:.78rem;font-weight:580;backdrop-filter:blur(22px)}
.toast[data-type="error"]{color:#ffaaa4;border-color:rgba(255,69,58,.28)}

/* Dialogs */
.shortcut-modal{position:fixed;inset:0;z-index:180;display:grid;place-items:center;padding:22px}
.shortcut-modal[hidden]{display:none!important}
.shortcut-backdrop{position:absolute;inset:0;background:rgba(0,0,0,.68);backdrop-filter:blur(12px)}
.shortcut-card{position:relative;width:min(520px,100%);border-radius:28px;padding:26px;background:rgba(27,27,33,.96);border:1px solid var(--v3-line-strong);box-shadow:var(--v3-shadow)}
.shortcut-card-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}
.shortcut-card h2{font-size:1.45rem;letter-spacing:-.04em;margin:0}
.shortcut-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.shortcut-row{padding:12px;border-radius:13px;background:rgba(255,255,255,.035);display:flex;justify-content:space-between;color:#9696a0;font-size:.74rem}
.shortcut-row kbd{padding:3px 7px;border-radius:6px;background:rgba(255,255,255,.08);border:1px solid var(--v3-line);color:#dddde3;font:inherit;font-size:.68rem}

/* Loading */
.app-loading{background:#050507}
.app-loading>div{max-width:500px}
.loader-mark{background:conic-gradient(from 180deg,var(--v3-blue),var(--v3-purple),var(--v3-blue-2),var(--v3-blue));box-shadow:0 0 50px rgba(10,132,255,.22)}
.app-loading h1{letter-spacing:-.045em}
.app-loading p{color:var(--v3-muted)}

/* Responsive */
@media (max-width:1320px){
  :root{--v3-sidebar:228px}
  .library-grid,.recommendation-row{grid-template-columns:repeat(3,minmax(0,1fr))}
  .collections-row{grid-template-columns:repeat(3,minmax(0,1fr))}
  .collections-row .collection-card:nth-child(n+4){min-height:130px}
  .viewer-footer-grid{grid-template-columns:minmax(200px,.7fr) minmax(320px,1.2fr) minmax(250px,.8fr)}
  .portal-main{gap:44px}
  .portal-story h1{font-size:clamp(4rem,7vw,7rem)}
}
@media (max-width:1100px){
  .portal-main{grid-template-columns:1fr;max-width:900px;padding-top:30px}
  .portal-story{text-align:center}
  .portal-lead,.portal-proof-grid,.portal-showcase{margin-left:auto;margin-right:auto}
  .portal-showcase{height:300px}
  .portal-auth-card{width:min(560px,100%);margin:0 auto}
  .portal-footer{margin-top:0}
  .v3-hero{grid-template-columns:1fr;min-height:auto}
  .hero-visual{min-height:300px}
  .momentum-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .home-content-grid{grid-template-columns:1fr}
  .smart-queue-card{min-height:260px}
  .progress-overview{grid-template-columns:1fr}
  .filter-bar.v3-filter-bar{grid-template-columns:repeat(2,minmax(160px,1fr)) auto}
  .filter-result-count{grid-column:3;grid-row:1/3}
  .viewer-footer-grid{grid-template-columns:1fr 1fr}
  .confidence-control{grid-column:1/-1;grid-row:1}
  .viewer-actions{grid-column:1;grid-row:2}
  .viewer-navigation{grid-column:2;grid-row:2}
}
@media (max-width:900px){
  :root{--v3-topbar:68px}
  .app-layout{display:block}
  .sidebar{transform:translateX(-105%);transition:transform .28s cubic-bezier(.2,.8,.2,1);width:min(310px,86vw);box-shadow:30px 0 80px rgba(0,0,0,.52)}
  .sidebar.open{transform:translateX(0)}
  .sidebar-scrim{position:fixed;inset:0;z-index:50;background:rgba(0,0,0,.62);backdrop-filter:blur(8px)}
  .sidebar-scrim.visible{display:block}
  .main-column{min-height:100vh}
  .mobile-menu{display:grid;flex:0 0 auto}
  .topbar-context{display:none}
  .global-search{width:auto;flex:1;margin:0}
  .profile-button div{display:none}
  .main-content{padding-bottom:106px}
  .mobile-tabs{display:grid;grid-template-columns:repeat(5,1fr);position:fixed;z-index:48;left:12px;right:12px;bottom:max(10px,env(safe-area-inset-bottom));height:66px;padding:5px;border-radius:21px;background:rgba(27,27,33,.88);border:1px solid var(--v3-line-strong);box-shadow:0 18px 55px rgba(0,0,0,.5);backdrop-filter:blur(28px) saturate(150%)}
  .mobile-tabs button{border:0;border-radius:16px;background:transparent;color:#6f6f79;display:grid;place-items:center;align-content:center;gap:3px}
  .mobile-tabs button.active{background:rgba(10,132,255,.13);color:#b7e8ff}
  .mobile-tabs svg{width:20px;height:20px}
  .mobile-tabs small{font-size:.58rem}
  .library-grid,.recommendation-row{grid-template-columns:repeat(2,minmax(0,1fr))}
  .collections-row{grid-template-columns:repeat(2,minmax(0,1fr))}
  .course-grid.v3-course-grid{grid-template-columns:1fr}
  .account-grid.v3-account-grid{grid-template-columns:1fr}
  .sprint-hero.v3-sprint{grid-template-columns:1fr;text-align:center}
  .sprint-copy p{margin-left:auto;margin-right:auto}
  .sprint-options,.sprint-copy .hero-actions{justify-content:center}
  .viewer-header{padding-left:15px}
  .viewer-header-actions .button span{display:none}
  .viewer-toolbar{padding-left:10px;padding-right:10px}
  .annotation-palette{top:58px;right:10px;width:min(310px,calc(100vw - 20px))}
}
@media (max-width:680px){
  .portal-nav{height:70px;padding:0 18px}
  .portal-brand img{width:158px}
  .portal-brand span,.portal-nav-links a:not(.portal-support-pill){display:none}
  .portal-support-pill{padding:8px 11px;font-size:.72rem}
  .portal-main{padding:31px 18px 48px;gap:36px;min-height:auto}
  .portal-story h1{font-size:clamp(3.55rem,17vw,5.2rem);margin-top:24px}
  .portal-lead{font-size:1rem}
  .portal-proof-grid{grid-template-columns:1fr 1fr}
  .portal-proof:last-child{grid-column:1/-1}
  .portal-showcase{height:230px;margin-top:30px}
  .portal-slide{width:86%}
  .portal-slide:nth-child(1){left:0}
  .portal-slide:nth-child(2){left:7%}
  .portal-slide:nth-child(3){left:14%}
  .portal-auth-card{padding:25px;border-radius:28px}
  .portal-footer{padding:0 18px 22px;display:block;text-align:center;line-height:1.7}
  .portal-footer span{display:block}
  .main-content{padding:24px 14px 100px}
  .topbar{padding:0 12px;gap:9px}
  .global-search input{padding-right:43px;font-size:.8rem}
  .search-shortcut{font-size:0;padding:5px}
  .search-shortcut::after{content:"⌘K";font-size:.58rem}
  .profile-button{padding:0}
  .profile-avatar{width:38px;height:38px}
  .page-head{display:block;margin-bottom:24px}
  .page-head h1{font-size:2.65rem}
  .page-head .course-switch{margin-top:18px;width:max-content}
  .v3-hero{border-radius:29px;padding:27px 22px;gap:24px}
  .hero-copy h1{font-size:3.55rem}
  .hero-copy p{font-size:.94rem}
  .hero-microcopy{display:grid;gap:8px}
  .hero-visual{min-height:230px}
  .hero-slide-card{width:94%;border-radius:14px}
  .hero-progress-pill{right:-2px;bottom:-8px;padding:10px 12px}
  .momentum-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}
  .momentum-card{min-height:112px;padding:16px;border-radius:20px}
  .momentum-card strong{font-size:1.7rem}
  .collections-row{display:flex;overflow-x:auto;scroll-snap-type:x mandatory;margin-right:-14px;padding-right:14px;scrollbar-width:none}
  .collections-row::-webkit-scrollbar{display:none}
  .collection-card{flex:0 0 195px;scroll-snap-align:start;min-height:145px}
  .section-heading{margin-top:38px;align-items:center}
  .section-heading h2{font-size:1.9rem}
  .section-heading .text-button{font-size:.72rem}
  .resume-card{grid-template-columns:1fr;padding:15px;gap:17px}
  .resume-copy{padding:0 5px 5px}
  .v3-course-card{min-height:230px;padding:23px}
  .v3-course-card h3{font-size:1.8rem}
  .library-command-bar{align-items:flex-start;display:grid;grid-template-columns:1fr auto}
  .smart-presets{grid-column:1/-1;flex-wrap:nowrap;overflow-x:auto;margin-right:-14px;padding-right:14px;scrollbar-width:none}
  .smart-presets::-webkit-scrollbar{display:none}
  .preset-chip{flex:0 0 auto}
  .filter-bar.v3-filter-bar{grid-template-columns:1fr 1fr;gap:7px;padding:8px}
  .filter-bar.v3-filter-bar select{min-width:0;font-size:.68rem;padding-left:9px}
  .filter-result-count{grid-column:1/-1;grid-row:auto;text-align:center;padding:4px 0}
  .library-grid,.recommendation-row{grid-template-columns:1fr 1fr;gap:9px}
  .topic-tile{border-radius:16px}
  .topic-copy{padding:11px 11px 13px}
  .topic-copy h3{font-size:.81rem;min-height:2.46em;margin:7px 0 11px}
  .topic-copy>small{font-size:.52rem}
  .topic-meta{font-size:.56rem}
  .tier-pill{font-size:.54rem;padding:5px 7px;left:7px;top:7px}
  .bookmark-button{width:30px;height:30px;right:7px;top:7px}
  .library-grid.list-view .topic-tile{grid-template-columns:125px minmax(0,1fr)}
  .library-grid.list-view .topic-copy{padding:11px 12px;column-gap:10px}
  .library-grid.list-view .topic-copy h3{font-size:.79rem}
  .sprint-hero.v3-sprint{padding:28px 20px;border-radius:29px;gap:30px}
  .sprint-copy h2{font-size:3.2rem}
  .sprint-orbit{width:190px;height:190px}
  .sprint-orbit strong{font-size:4.3rem}
  .progress-master-card{display:grid;text-align:center;justify-items:center;padding:25px}
  .progress-stats-grid{grid-template-columns:repeat(3,1fr)}
  .progress-stat{padding:16px 12px;border-radius:18px}
  .progress-stat strong{font-size:1.55rem}
  .confidence-summary.v3-confidence{grid-template-columns:1fr 1fr}
  .progress-table.v3-progress-table{padding:21px 17px}
  .progress-line{grid-template-columns:105px minmax(0,1fr) 34px;gap:9px;font-size:.64rem}
  .viewer{grid-template-rows:auto auto minmax(0,1fr) auto}
  .viewer-header{min-height:62px;padding:8px 9px 8px 13px}
  .viewer-title span{font-size:.54rem}
  .viewer-title h2{font-size:.94rem;margin-top:3px;max-width:54vw}
  .viewer-header-actions{gap:4px}
  .viewer-header-actions .button{width:38px;padding:0;display:grid;place-items:center;font-size:0}
  .viewer-header-actions .button svg{width:17px;height:17px}
  .viewer-toolbar{min-height:48px;padding:5px 7px}
  .tool-button{height:34px;padding:0 9px;font-size:.64rem}
  .tool-button .tool-label{display:none}
  .viewer-footer{min-height:125px;padding:8px 9px calc(8px + env(safe-area-inset-bottom))}
  .viewer-footer-grid{grid-template-columns:1fr;gap:7px}
  .confidence-control{grid-column:1;grid-row:1}
  .viewer-actions{grid-column:1;grid-row:2;justify-content:center}
  .viewer-navigation{grid-column:1;grid-row:3}
  .viewer-actions .button{flex:1;max-width:180px}
  .viewer-navigation .button{font-size:0;width:40px;padding:0;display:grid;place-items:center}
  .viewer-navigation .button svg{width:17px;height:17px}
  .viewer-shortcuts{display:none}
  .slide-notes{display:none}
  .annotation-palette{top:52px;right:7px;width:calc(100vw - 14px);padding:11px}
  .toast{left:12px;right:12px;bottom:88px;text-align:center}
  .shortcut-grid{grid-template-columns:1fr}
}
@media (max-width:420px){
  .library-grid,.recommendation-row{grid-template-columns:1fr}
  .topic-copy h3{font-size:.95rem;min-height:0}
  .portal-proof-grid{grid-template-columns:1fr}
  .portal-proof:last-child{grid-column:auto}
  .momentum-grid{grid-template-columns:1fr 1fr}
  .hero-copy h1{font-size:3.1rem}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{scroll-behavior:auto!important;animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}
}


/* Visual Learning OS V4 — learning intelligence and mobile refinement */
.momentum-card{display:flex;flex-direction:column;justify-content:space-between}
.momentum-value{display:flex;align-items:baseline;gap:8px;flex-wrap:wrap;margin-top:13px}
.momentum-value strong{line-height:.94}
.momentum-value b{display:block;color:var(--v3-muted);font-size:.69rem;font-weight:620;line-height:1.35;max-width:16ch}
.daily-goal-track{margin-top:13px}
.collections-row{grid-template-columns:repeat(6,minmax(0,1fr))}
.due-badge{position:absolute;left:9px;bottom:9px;z-index:3;padding:5px 8px;border-radius:999px;background:rgba(100,210,255,.92);color:#031018;font-size:.55rem;font-weight:820;font-style:normal;box-shadow:0 7px 20px rgba(10,132,255,.35)}
.study-plan-card,.progress-plan-card,.review-forecast-card{margin-top:28px;border:1px solid var(--v3-line);border-radius:var(--v3-radius-lg);background:linear-gradient(145deg,rgba(20,27,39,.9),rgba(16,16,22,.84));box-shadow:var(--v3-shadow-soft);overflow:hidden}
.study-plan-card{padding:30px 32px;display:grid;grid-template-columns:minmax(0,1.2fr) minmax(280px,.8fr);gap:28px;align-items:end}
.study-plan-copy h2,.progress-plan-card h2,.review-forecast-card h2{margin:8px 0 10px;font-size:clamp(1.7rem,2.5vw,2.55rem);letter-spacing:-.052em;line-height:1.02}
.study-plan-copy p,.progress-plan-card p,.review-forecast-card p{color:var(--v3-muted);line-height:1.58;max-width:68ch}
.study-plan-actions{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-top:20px}.study-plan-actions>span{font-size:.74rem;color:var(--v3-muted)}
.activity-strip,.activity-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:6px;align-content:end}
.activity-strip{grid-template-columns:repeat(21,1fr);height:92px;align-items:end}
.activity-strip i,.activity-grid i,.activity-legend i{display:block;border-radius:5px;background:color-mix(in srgb,var(--v3-blue) calc(var(--activity,0)*88%),rgba(255,255,255,.055));border:1px solid rgba(255,255,255,.035)}
.activity-strip i{height:calc(8px + var(--activity,0)*70px)}
.progress-plan-card{padding:29px 31px;display:grid;grid-template-columns:minmax(0,1fr) minmax(330px,.8fr);gap:34px;align-items:center}
.activity-panel{padding:18px;border-radius:20px;background:rgba(0,0,0,.2);border:1px solid var(--v3-line)}
.activity-head{display:flex;justify-content:space-between;gap:16px;margin-bottom:14px;font-size:.72rem}.activity-head span{color:var(--v3-muted)}
.activity-grid{grid-template-columns:repeat(7,1fr)}.activity-grid i{aspect-ratio:1}
.activity-legend{display:flex;align-items:center;justify-content:flex-end;gap:5px;margin-top:12px;color:var(--v3-muted-2);font-size:.58rem}.activity-legend i{width:11px;height:11px}
.review-forecast-card{padding:29px 31px;display:grid;grid-template-columns:minmax(260px,.75fr) minmax(420px,1.25fr);gap:36px;align-items:end}
.forecast-bars{height:150px;display:grid;grid-template-columns:repeat(7,1fr);gap:10px;align-items:end}
.forecast-bars>div{height:100%;display:grid;grid-template-rows:auto minmax(0,1fr) auto;gap:7px;text-align:center;color:var(--v3-muted);font-size:.64rem}
.forecast-bars i{display:flex;align-items:flex-end;justify-content:center;height:100%;border-radius:12px;background:rgba(255,255,255,.035);overflow:hidden;border:1px solid rgba(255,255,255,.045)}
.forecast-bars b{display:block;width:100%;min-height:5px;border-radius:10px 10px 0 0;background:linear-gradient(180deg,var(--v3-blue-2),var(--v3-blue));box-shadow:0 -10px 30px rgba(10,132,255,.25)}
.forecast-bars strong{color:var(--v3-text);font-size:.76rem}
.schedule-caption{display:block;margin-top:7px;color:var(--v3-blue-2);font-size:.62rem;font-weight:620;letter-spacing:0}
.account-plan-summary{margin:20px 0;padding:17px 18px;border-radius:18px;background:rgba(10,132,255,.09);border:1px solid rgba(100,210,255,.15);display:grid;gap:4px}.account-plan-summary span{font-size:.65rem;color:var(--v3-blue-2);text-transform:uppercase;letter-spacing:.08em;font-weight:750}.account-plan-summary strong{font-size:1.55rem;letter-spacing:-.04em}.account-plan-summary small{color:var(--v3-muted)}
.date-control{display:flex;align-items:center;gap:8px;flex-wrap:wrap;justify-content:flex-end}.date-control input{min-height:40px;padding:0 12px;border-radius:12px;background:rgba(0,0,0,.24);border:1px solid var(--v3-line-strong);color:var(--v3-text);font:inherit;color-scheme:dark}.date-control input:focus{border-color:var(--v3-blue-2);outline:0;box-shadow:0 0 0 4px rgba(10,132,255,.12)}
.preference-status{display:inline-flex;align-items:center;gap:7px;color:#b8f8c5;font-size:.75rem;font-weight:700}.preference-status i{width:8px;height:8px;border-radius:50%;background:var(--v3-green);box-shadow:0 0 14px rgba(48,209,88,.55)}
.progress-stats-grid{grid-template-columns:repeat(4,1fr)}
.confidence-control{min-width:0}.confidence-control>div{display:flex;gap:5px;flex-wrap:nowrap}
.slide-notes{border-top:1px solid var(--v3-line);padding-top:8px}
.viewer-toolbar{justify-content:space-between}
@media(max-width:1320px){.collections-row{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:980px){.study-plan-card,.progress-plan-card,.review-forecast-card{grid-template-columns:1fr}.activity-strip{height:65px}.review-forecast-card{gap:22px}}
@media(max-width:680px){
  .momentum-value{gap:6px}.momentum-value b{font-size:.61rem;max-width:13ch}
  .study-plan-card,.progress-plan-card,.review-forecast-card{padding:23px 19px;border-radius:25px}
  .study-plan-card{gap:22px}.activity-strip{grid-template-columns:repeat(21,12px);overflow:hidden;justify-content:end}
  .progress-stats-grid{grid-template-columns:1fr 1fr}
  .forecast-bars{height:125px;gap:6px}.forecast-bars>div{font-size:.55rem}
  .date-control{justify-content:flex-start;width:100%;margin-top:10px}.date-control input{flex:1}
  .exam-date-row{align-items:flex-start!important;flex-direction:column}
  .viewer{width:100%;height:100dvh;margin:0;border-radius:0;border:0;grid-template-rows:auto auto minmax(0,1fr) auto}
  .viewer-stage{padding:6px}
  .viewer-footer{max-height:38dvh;overflow-y:auto;overscroll-behavior:contain;padding-bottom:calc(12px + env(safe-area-inset-bottom))}
  .slide-notes{display:block!important;margin-top:8px}.slide-notes summary{min-height:38px}.slide-notes textarea{min-height:72px;max-height:130px}
  .schedule-caption{text-align:center}
  .viewer-toolbar{overflow-x:auto;scrollbar-width:none;justify-content:flex-start}.viewer-toolbar::-webkit-scrollbar{display:none}.viewer-orientation-tools{flex:0 0 auto}
  .annotation-palette{position:fixed;top:auto;bottom:calc(12px + env(safe-area-inset-bottom));max-height:70dvh;overflow:auto;border-radius:25px}
}

/* V4.1 — recall-first viewer, calmer controls and premium study planning */
.public-site-link{display:flex;align-items:center;justify-content:space-between;gap:9px;margin:12px 7px 0;padding:11px 12px;border-radius:14px;border:1px solid var(--v3-line);background:rgba(255,255,255,.035);color:#a7a7b1;font-size:.72rem;font-weight:650;transition:.2s ease}
.public-site-link:hover{color:#fff;background:rgba(255,255,255,.07);transform:translateY(-1px)}
.public-site-link svg{width:15px;height:15px;color:var(--v3-blue-2)}
.account-preferences-title{font-size:1.65rem;letter-spacing:-.045em;margin:9px 0 0}
.public-account-link{margin-bottom:10px;width:100%;justify-content:center}
.preference-toggle{min-width:82px;height:40px;padding:4px 8px 4px 5px;border-radius:999px;border:1px solid var(--v3-line);background:rgba(255,255,255,.055);display:flex;align-items:center;gap:8px;color:#8c8c96;font-size:.72rem;font-weight:730;transition:.22s ease}
.preference-toggle i{width:30px;height:30px;border-radius:50%;background:#6a6a73;box-shadow:inset 0 1px rgba(255,255,255,.25);transition:.22s cubic-bezier(.2,.8,.2,1)}
.preference-toggle.active{background:rgba(48,209,88,.12);border-color:rgba(48,209,88,.25);color:#baf7c7}
.preference-toggle.active i{transform:translateX(28px);background:var(--v3-green);box-shadow:0 0 20px rgba(48,209,88,.35)}
.preference-toggle.active span{transform:translateX(-28px)}
.preference-toggle span{transition:.22s ease}

.recall-curtain{position:absolute;inset:0;z-index:30;display:grid;place-items:center;padding:clamp(18px,4vw,54px);background:radial-gradient(circle at 50% 44%,rgba(10,132,255,.15),transparent 35%),rgba(2,2,4,.78);backdrop-filter:blur(18px) saturate(120%);-webkit-backdrop-filter:blur(18px) saturate(120%);transition:opacity .22s ease,transform .22s ease}
.recall-curtain.leaving{opacity:0;transform:scale(1.015);pointer-events:none}
.recall-card{width:min(650px,94vw);padding:clamp(26px,4vw,44px);border-radius:34px;border:1px solid rgba(255,255,255,.13);background:linear-gradient(155deg,rgba(28,32,43,.95),rgba(12,12,17,.94));box-shadow:0 38px 120px rgba(0,0,0,.62),inset 0 1px rgba(255,255,255,.08);text-align:center}
.recall-orb{width:54px;height:54px;border-radius:18px;display:grid;place-items:center;margin:0 auto 18px;background:linear-gradient(145deg,rgba(100,210,255,.22),rgba(191,90,242,.18));border:1px solid rgba(100,210,255,.25);color:#bcecff;box-shadow:0 18px 45px rgba(10,132,255,.18)}
.recall-orb svg{width:25px;height:25px}
.recall-card h3{font-size:clamp(2rem,4vw,3.55rem);line-height:.98;letter-spacing:-.06em;margin:10px 0 16px}
.recall-card p{max-width:56ch;margin:0 auto;color:#c3c3cc;font-size:clamp(.96rem,1.6vw,1.16rem);line-height:1.6}
.recall-cues{display:flex;justify-content:center;flex-wrap:wrap;gap:8px;margin:24px 0}
.recall-cues span{padding:8px 11px;border-radius:999px;border:1px solid var(--v3-line);background:rgba(255,255,255,.045);color:#9f9fa9;font-size:.69rem;font-weight:650}
.recall-card .button{margin:0 auto}
.recall-card>small{display:block;margin-top:13px;color:#666672;font-size:.65rem}
.recall-blurred{filter:blur(18px) brightness(.44);transform:scale(.985);transition:filter .24s ease,transform .24s ease}

.viewer-more-menu{position:absolute;right:15px;top:15px;z-index:42;width:min(350px,calc(100vw - 30px));padding:14px;border-radius:24px;background:rgba(24,24,30,.97);border:1px solid var(--v3-line-strong);box-shadow:0 30px 90px rgba(0,0,0,.58);backdrop-filter:blur(30px);-webkit-backdrop-filter:blur(30px)}
.more-action{width:100%;min-height:58px;padding:10px 12px;display:flex;align-items:center;gap:13px;border:0;border-radius:15px;background:transparent;color:#fff;text-align:left;transition:.18s ease}
.more-action:hover{background:rgba(255,255,255,.065)}
.more-action>svg{width:20px;height:20px;flex:0 0 auto;color:var(--v3-blue-2)}
.more-action span{min-width:0}.more-action b{display:block;font-size:.78rem}.more-action small{display:block;margin-top:3px;color:#74747e;font-size:.65rem}
.confidence-control>small{display:block;text-align:center;margin-top:7px;color:#74747e;font-size:.61rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.sprint-results-head h2{font-size:2.2rem;letter-spacing:-.05em;margin:6px 0 0}.sprint-results-head p{margin:5px 0 0;color:var(--v3-muted);font-size:.78rem}

@media(max-width:900px){
  .public-site-link{display:none}
  .recall-card{border-radius:28px}
}
@media(max-width:680px){
  .viewer-header-actions .button[data-action="toggle-focus"]{display:none}
  .recall-curtain{padding:14px;place-items:center}
  .recall-card{padding:28px 20px 24px;border-radius:26px}
  .recall-card h3{font-size:2.35rem}
  .recall-card p{font-size:.9rem;line-height:1.52}
  .recall-cues{margin:18px 0;gap:6px}.recall-cues span{font-size:.6rem;padding:7px 9px}
  .viewer-more-menu{position:fixed;top:auto;bottom:calc(10px + env(safe-area-inset-bottom));right:7px;left:7px;width:auto;max-height:72dvh;overflow:auto;border-radius:25px}
  .preference-toggle{align-self:flex-start;margin-top:8px}
  .confidence-control>small{white-space:normal}
}


/* V4.2 — polished notes, tool menus and touch-first viewer */
.viewer-header-actions [data-action="toggle-viewer-more"][aria-expanded="true"],
.viewer-actions [data-action="toggle-notes"].active,
.viewer-actions [data-action="toggle-notes"].has-note{border-color:rgba(100,210,255,.28);background:rgba(10,132,255,.12);color:#bcecff}
.viewer-more-menu .palette-head{padding:2px 2px 9px;margin-bottom:2px;border-bottom:1px solid rgba(255,255,255,.06)}
.viewer-more-menu[hidden],.notes-sheet[hidden]{display:none!important}
.notes-sheet{position:absolute;z-index:45;right:18px;bottom:126px;width:min(420px,calc(100% - 36px));padding:18px;border-radius:25px;background:rgba(24,24,30,.97);border:1px solid var(--v3-line-strong);box-shadow:0 34px 100px rgba(0,0,0,.62);backdrop-filter:blur(34px) saturate(140%);-webkit-backdrop-filter:blur(34px) saturate(140%);animation:notes-in .2s cubic-bezier(.2,.8,.2,1)}
@keyframes notes-in{from{opacity:0;transform:translateY(12px) scale(.975)}to{opacity:1;transform:none}}
.notes-sheet-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px}
.notes-sheet-head>div{display:grid;gap:7px}.notes-sheet-head strong{font-size:1.06rem;letter-spacing:-.03em;line-height:1.25}.notes-sheet-head .icon-button{flex:0 0 auto}
.notes-sheet textarea{display:block;width:100%;min-height:160px;margin:16px 0 12px;padding:15px 16px;border-radius:18px;border:1px solid var(--v3-line);background:rgba(0,0,0,.32);color:#f5f5f7;font:inherit;font-size:.86rem;line-height:1.58;resize:vertical;outline:0;box-shadow:inset 0 1px rgba(255,255,255,.02)}
.notes-sheet textarea:focus{border-color:rgba(100,210,255,.48);box-shadow:0 0 0 4px rgba(10,132,255,.11)}
.notes-sheet-foot{display:flex;align-items:center;justify-content:space-between;gap:16px;color:var(--v3-muted-2);font-size:.66rem}
.viewer-stage{touch-action:pan-x pan-y}
.viewer-toolbar .tool-button.active,.viewer-annotation-toggle.active{background:rgba(10,132,255,.14);border-color:rgba(100,210,255,.27);color:#c2edff}
.viewer-actions .button svg{width:17px;height:17px}
.momentum-card .momentum-value{min-height:40px}
.momentum-card .momentum-value strong{font-size:clamp(1.75rem,2.2vw,2.35rem);letter-spacing:-.055em}
.momentum-card .momentum-value b{margin:0}

@media(max-width:1100px){
  .notes-sheet{bottom:132px}
}
@media(max-width:680px){
  .viewer-footer{max-height:none;overflow:visible}
  .viewer-footer-grid{gap:6px}
  .viewer-actions{display:grid;grid-template-columns:repeat(3,1fr);gap:5px}
  .viewer-actions .button{width:100%;max-width:none;min-height:38px;padding:0 8px;font-size:.62rem;gap:5px}
  .viewer-actions .button svg{width:15px;height:15px}
  .confidence-control>div{width:100%;display:grid;grid-template-columns:repeat(4,1fr);padding:3px}
  .confidence-button{justify-content:center;padding:0 4px;font-size:.61rem}
  .viewer-navigation>span{font-size:.58rem}
  .viewer-more-menu{padding:13px 13px calc(13px + env(safe-area-inset-bottom))}
  .more-action{min-height:54px}
  .notes-sheet{position:fixed;left:7px;right:7px;bottom:calc(8px + env(safe-area-inset-bottom));width:auto;padding:17px;border-radius:27px;max-height:78dvh;overflow:auto}
  .notes-sheet textarea{min-height:150px;max-height:42dvh}
  .notes-sheet-foot{align-items:flex-start}.notes-sheet-foot span{max-width:26ch;line-height:1.4}
  .recall-card>small{font-size:.59rem}
}


/* V4.2 — launch refinement */
.portal-brand img,.app-brand img{filter:drop-shadow(0 8px 24px rgba(0,0,0,.26))}
.portal-auth-card,.v3-hero,.resume-card,.smart-queue-card,.study-plan-card,.progress-plan-card,.review-forecast-card{isolation:isolate}
.portal-auth-card::after,.v3-hero::after{content:"";position:absolute;inset:0;pointer-events:none;border-radius:inherit;background:linear-gradient(125deg,rgba(255,255,255,.06),transparent 22%,transparent 76%,rgba(100,210,255,.035));z-index:-1}
.preference-toggle{position:relative;justify-content:flex-end;overflow:hidden;padding:4px 10px 4px 5px}
.preference-toggle i{position:absolute;left:5px;top:4px}
.preference-toggle span{position:relative;z-index:1;min-width:30px;text-align:right}
.preference-toggle.active{justify-content:flex-start;padding:4px 5px 4px 10px}
.preference-toggle.active i{left:calc(100% - 35px);transform:none}
.preference-toggle.active span{transform:none;text-align:left}
.viewer-header-actions .button[aria-expanded="true"],.viewer-annotation-toggle.active{background:rgba(10,132,255,.16);border-color:rgba(100,210,255,.28);color:#c8efff}
.recall-card .button svg{transition:transform .2s ease}.recall-card .button:hover svg{transform:translateX(3px)}
.viewer-more-menu[hidden],.annotation-palette[hidden]{display:none!important}
.more-action:focus-visible{outline-offset:0}
.viewer-stage{touch-action:none}
#slide-image{will-change:transform}
.topic-tile:focus-visible,.collection-card:focus-visible,.v3-course-card:focus-within{outline:2px solid rgba(100,210,255,.72);outline-offset:3px}
@media(max-width:680px){
  .portal-nav{padding-top:env(safe-area-inset-top);height:calc(70px + env(safe-area-inset-top))}
  .viewer-header{padding-top:max(8px,env(safe-area-inset-top))}
  .viewer-more-menu,.annotation-palette{box-shadow:0 -26px 80px rgba(0,0,0,.68)}
  .recall-card>small{line-height:1.45}
}

/* V4.2 final touch refinements */
.palette-head>div{display:grid;gap:2px}
@media(max-width:680px){
  body.modal-open .toast{top:calc(72px + env(safe-area-inset-top));bottom:auto}
  .annotation-palette .palette-head strong{line-height:1.15}
  .annotation-palette .palette-head small{line-height:1.35}
}

/* ========================================================================== 
   V4.4 TOUCH-FIRST FOCUS — progressive disclosure, one-click resume,
   responsive visual viewport, pinch-centred zoom and dual-layer annotation.
   ========================================================================== */

/* Today: one recommendation, one secondary priority */
.today-page{width:min(1160px,100%);margin:0 auto;display:grid;gap:18px}
.today-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;margin-bottom:4px}
.today-heading h1{margin:7px 0 7px;font-size:clamp(2.5rem,5.6vw,5.6rem);line-height:.94;letter-spacing:-.067em;font-weight:730}
.today-heading p{margin:0;color:var(--v3-muted);font-size:clamp(.9rem,1.35vw,1.05rem)}
.today-date{align-self:flex-start;margin-top:8px;padding:10px 13px;border:1px solid var(--v3-line);border-radius:999px;background:rgba(255,255,255,.035);color:#8d8d97;font-size:.72rem;white-space:nowrap}
.today-primary-card{position:relative;isolation:isolate;overflow:hidden;display:grid;grid-template-columns:minmax(0,1.15fr) minmax(300px,.85fr);gap:clamp(24px,4vw,58px);align-items:center;min-height:410px;padding:clamp(30px,5vw,66px);border-radius:38px;border:1px solid rgba(255,255,255,.13);background:linear-gradient(145deg,rgba(20,29,45,.95),rgba(12,12,18,.96) 56%,rgba(30,17,42,.82));box-shadow:0 38px 120px rgba(0,0,0,.46),inset 0 1px rgba(255,255,255,.08);cursor:pointer;transition:transform .28s cubic-bezier(.2,.8,.2,1),border-color .28s,box-shadow .28s}
.today-primary-card::before{content:"";position:absolute;inset:-45% 32% auto -18%;height:620px;border-radius:50%;background:radial-gradient(circle,rgba(10,132,255,.22),transparent 67%);z-index:-1;pointer-events:none}
.today-primary-card::after{content:"";position:absolute;inset:0;border-radius:inherit;background:linear-gradient(120deg,rgba(255,255,255,.08),transparent 22%,transparent 74%,rgba(191,90,242,.05));z-index:-1;pointer-events:none}
.today-primary-card:hover{transform:translateY(-3px);border-color:rgba(100,210,255,.24);box-shadow:0 44px 130px rgba(0,0,0,.52),0 0 0 1px rgba(100,210,255,.04)}
.today-primary-copy{position:relative;z-index:2;min-width:0}
.today-kicker{display:inline-flex;align-items:center;gap:9px;padding:8px 12px;border-radius:999px;background:rgba(10,132,255,.11);border:1px solid rgba(100,210,255,.18);color:#bcecff;font-size:.69rem;font-weight:700;text-transform:uppercase;letter-spacing:.075em}
.live-dot{width:7px;height:7px;border-radius:50%;background:var(--v3-green);box-shadow:0 0 18px rgba(48,209,88,.8)}
.today-primary-copy h2{max-width:760px;margin:20px 0 14px;font-size:clamp(2.5rem,5vw,5.5rem);line-height:.91;letter-spacing:-.07em;font-weight:720}
.today-primary-copy>p{max-width:660px;margin:0;color:#aaaab4;font-size:clamp(.92rem,1.4vw,1.08rem);line-height:1.58}
.today-session-meta{display:flex;flex-wrap:wrap;gap:8px;margin:24px 0 22px}
.today-session-meta span{display:inline-flex;align-items:center;gap:7px;padding:8px 11px;border-radius:999px;border:1px solid var(--v3-line);background:rgba(255,255,255,.04);color:#92929c;font-size:.68rem}
.today-session-meta svg{width:15px;height:15px;color:#8edcff}
.today-start-button{min-height:52px;padding:0 22px}
.today-change-link{margin-left:11px;padding:12px;border:0;background:transparent;color:#8c8c96;font-size:.75rem;font-weight:650}
.today-change-link:hover{color:#fff}
.today-primary-visual{position:relative;min-width:0;align-self:stretch;display:grid;place-items:center;perspective:1000px}
.today-primary-visual img{width:min(100%,520px);aspect-ratio:16/9;object-fit:cover;border-radius:22px;border:1px solid rgba(255,255,255,.17);box-shadow:0 35px 86px rgba(0,0,0,.56);transform:rotateY(-7deg) rotateZ(1deg);transition:transform .35s cubic-bezier(.2,.8,.2,1)}
.today-primary-card:hover .today-primary-visual img{transform:rotateY(-3deg) rotateZ(.4deg) scale(1.015)}
.today-ring{--ring:0deg;position:absolute;right:-8px;bottom:12px;width:106px;height:106px;border-radius:50%;display:grid;place-items:center;background:conic-gradient(var(--v3-blue-2) var(--ring),rgba(255,255,255,.1) 0);box-shadow:0 18px 50px rgba(0,0,0,.4)}
.today-ring::before{content:"";width:88px;height:88px;border-radius:50%;background:#111116}
.today-ring span{position:absolute;text-align:center}.today-ring b{display:block;font-size:1.35rem;letter-spacing:-.05em}.today-ring small{display:block;color:#777781;font-size:.57rem;margin-top:2px}
.session-options-sheet{display:grid;grid-template-columns:repeat(4,1fr);gap:9px;padding:10px;border-radius:24px;border:1px solid var(--v3-line);background:rgba(255,255,255,.035);animation:v44-sheet-in .2s ease-out}
.session-options-sheet[hidden]{display:none!important}
.session-options-sheet button{min-height:82px;padding:15px 16px;border:1px solid transparent;border-radius:17px;background:rgba(255,255,255,.035);color:#fff;text-align:left;transition:.18s ease}
.session-options-sheet button:hover{background:rgba(255,255,255,.075);border-color:var(--v3-line)}
.session-options-sheet b{display:block;font-size:.8rem}.session-options-sheet span{display:block;margin-top:5px;color:#72727c;font-size:.65rem;line-height:1.35}
@keyframes v44-sheet-in{from{opacity:0;transform:translateY(-7px)}to{opacity:1;transform:none}}
.today-snapshot{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.today-snapshot article{min-height:96px;padding:17px 18px;border:1px solid var(--v3-line);border-radius:21px;background:rgba(255,255,255,.032);display:flex;align-items:center;gap:14px}
.today-snapshot article>span{width:38px;height:38px;border-radius:13px;display:grid;place-items:center;color:#a8e7ff;background:rgba(10,132,255,.11);border:1px solid rgba(100,210,255,.13)}
.today-snapshot svg{width:18px;height:18px}.today-snapshot strong{display:block;font-size:1.35rem;letter-spacing:-.04em}.today-snapshot small{display:block;margin-top:2px;color:#70707a;font-size:.64rem}
.next-step-card{display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:19px;padding:22px 24px;border-radius:25px;border:1px solid var(--v3-line);background:linear-gradient(110deg,rgba(191,90,242,.075),rgba(255,255,255,.035) 52%,rgba(10,132,255,.05))}
.next-step-icon{width:48px;height:48px;border-radius:16px;display:grid;place-items:center;color:#deb9ff;background:rgba(191,90,242,.12);border:1px solid rgba(191,90,242,.17)}
.next-step-icon svg{width:22px;height:22px}.next-step-copy h3{margin:5px 0 5px;font-size:1.25rem;letter-spacing:-.035em}.next-step-copy p{margin:0;color:#81818b;font-size:.73rem;line-height:1.45}
.today-more{border:1px solid var(--v3-line);border-radius:24px;background:rgba(255,255,255,.025);overflow:hidden}
.today-more summary{list-style:none;cursor:pointer;display:flex;justify-content:space-between;align-items:center;padding:18px 21px;color:#d6d6dc;font-size:.82rem;font-weight:620}
.today-more summary::-webkit-details-marker{display:none}.today-more summary small{color:#666670;font-size:.65rem;font-weight:500}
.today-more[open] summary{border-bottom:1px solid var(--v3-line)}
.today-more-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;padding:10px}
.today-more-grid button{min-height:80px;padding:14px;border:0;border-radius:17px;background:rgba(255,255,255,.035);color:#fff;display:flex;align-items:center;gap:12px;text-align:left}
.today-more-grid button:hover{background:rgba(255,255,255,.07)}.today-more-grid>button>svg{width:20px;height:20px;color:#8fdcff}.today-more-grid b{display:block;font-size:.76rem}.today-more-grid small{display:block;margin-top:4px;color:#70707a;font-size:.62rem}
.today-plan-line{display:flex;align-items:center;justify-content:space-between;padding:15px 20px;border-top:1px solid var(--v3-line);color:#80808a;font-size:.7rem}.today-plan-line span{display:flex;align-items:center;gap:8px}.today-plan-line svg{width:16px;height:16px}.today-plan-line b{color:#b8eaff;font-weight:650}

/* Action-first insights */
.insight-page-head{margin-bottom:22px}.insight-next-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:13px;margin-bottom:13px}
.insight-action{position:relative;min-height:310px;padding:clamp(28px,4vw,48px);border:1px solid var(--v3-line);border-radius:31px;background:rgba(255,255,255,.035);overflow:hidden;display:flex;align-items:flex-start;gap:22px}
.insight-action.primary-insight{background:linear-gradient(145deg,rgba(10,132,255,.15),rgba(18,18,25,.92) 58%,rgba(94,92,230,.09));border-color:rgba(100,210,255,.16)}
.insight-number{width:42px;height:42px;border-radius:14px;display:grid;place-items:center;flex:0 0 auto;background:rgba(255,255,255,.08);border:1px solid var(--v3-line);font-size:1rem;font-weight:750}
.insight-action h2{font-size:clamp(2rem,3.4vw,3.8rem);line-height:.96;letter-spacing:-.06em;margin:10px 0 15px;max-width:650px}.insight-action p{max-width:56ch;color:#8e8e98;font-size:.82rem;line-height:1.55;margin:0 0 25px}
.insight-summary{display:grid;grid-template-columns:repeat(4,1fr);gap:9px;margin-bottom:13px}.insight-summary article{padding:18px 20px;border-radius:20px;border:1px solid var(--v3-line);background:rgba(255,255,255,.03)}.insight-summary strong{display:block;font-size:1.65rem;letter-spacing:-.05em}.insight-summary span{display:block;margin-top:3px;color:#71717b;font-size:.65rem}
.insight-details{border:1px solid var(--v3-line);border-radius:27px;background:rgba(255,255,255,.025);overflow:hidden}.insight-details summary{list-style:none;cursor:pointer;padding:20px 23px;display:flex;align-items:center;justify-content:space-between}.insight-details summary::-webkit-details-marker{display:none}.insight-details summary span{font-size:.84rem;font-weight:630}.insight-details summary small{color:#676771;font-size:.65rem}.insight-details[open] summary{border-bottom:1px solid var(--v3-line)}
.insight-detail-grid{padding:12px;display:grid;grid-template-columns:1.2fr .8fr;gap:10px}.insight-panel{padding:24px;border-radius:21px;background:rgba(255,255,255,.035);border:1px solid rgba(255,255,255,.055)}.insight-panel:first-child{grid-row:span 2}.insight-panel-head{display:flex;justify-content:space-between;align-items:flex-start;gap:16px}.insight-panel-head h3{font-size:1.2rem;letter-spacing:-.035em;margin:6px 0 0}.insight-panel-head>span{color:#6f6f79;font-size:.67rem}
.mastery-bars{display:grid;gap:12px;margin-top:22px}.mastery-bars>div{display:grid;grid-template-columns:150px minmax(0,1fr) 38px;align-items:center;gap:12px;font-size:.68rem;color:#8c8c96}.mastery-bars i{height:6px;background:rgba(255,255,255,.07);border-radius:999px;overflow:hidden}.mastery-bars b{display:block;height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--v3-blue),var(--v3-blue-2))}.mastery-bars strong{text-align:right;color:#c3c3ca;font-size:.67rem}
.compact-forecast{height:150px;display:grid;grid-template-columns:repeat(7,1fr);gap:7px;align-items:end;margin-top:24px}.compact-forecast div{height:100%;display:grid;grid-template-rows:minmax(0,1fr) auto auto;gap:5px;justify-items:center;align-items:end}.compact-forecast b{width:16px;min-height:7px;border-radius:7px 7px 3px 3px;background:linear-gradient(180deg,var(--v3-blue-2),var(--v3-blue));box-shadow:0 0 18px rgba(10,132,255,.13)}.compact-forecast strong{font-size:.63rem}.compact-forecast span{color:#6c6c76;font-size:.58rem}
.weekly-dots{display:grid;grid-template-columns:repeat(14,1fr);gap:6px;margin:24px 0 14px}.weekly-dots i{aspect-ratio:1;border-radius:5px;background:color-mix(in srgb,var(--v3-blue) calc(var(--activity)*78%),rgba(255,255,255,.055));border:1px solid rgba(255,255,255,.045)}.insight-activity p{margin:0;color:#767680;font-size:.72rem}

/* Touch-first focus viewer */
.viewer{height:var(--viewer-vh,100dvh);top:var(--viewer-offset-top,0px);grid-template-rows:auto auto minmax(0,1fr) auto;contain:layout paint style}
.viewer-header{position:relative;z-index:55;display:grid;grid-template-columns:auto minmax(180px,1fr) minmax(150px,.8fr) auto;align-items:center;gap:12px;min-height:66px;padding:10px 14px;background:rgba(13,13,17,.82);backdrop-filter:blur(28px) saturate(150%);-webkit-backdrop-filter:blur(28px) saturate(150%)}
.viewer-exit-button{width:40px;height:40px}.viewer-title h2{font-size:1.02rem}.viewer-session-progress{min-width:0;display:grid;gap:7px;justify-items:center}.viewer-library-position{color:#7b7b85;font-size:.68rem}.session-progress-copy{display:flex;align-items:center;justify-content:center;gap:9px;min-width:0}.session-progress-copy b{max-width:160px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;font-size:.67rem;font-weight:650;color:#cacad1}.session-progress-copy span{color:#73737d;font-size:.62rem}.session-progress-segments{width:min(250px,100%);display:grid;grid-template-columns:repeat(10,1fr);gap:4px}.session-segment{height:4px;border-radius:999px;background:rgba(255,255,255,.11);transition:background .28s,transform .28s,box-shadow .28s}.session-segment.visited{background:rgba(100,210,255,.45)}.session-segment.current{background:var(--v3-blue-2);transform:scaleY(1.45);box-shadow:0 0 12px rgba(100,210,255,.35)}.session-segment.rated.again{background:rgba(255,69,58,.72)}.session-segment.rated.hard{background:rgba(255,159,10,.78)}.session-segment.rated.good,.session-segment.rated.easy{background:rgba(48,209,88,.72)}
.mobile-annotate-button{display:none}.viewer-header-actions{justify-self:end}
.viewer-stage{position:relative;overflow:hidden;display:block;padding:0;background:radial-gradient(900px 500px at 50% 50%,rgba(255,255,255,.035),transparent 70%),#010102;touch-action:none;user-select:none;-webkit-user-select:none}
.viewer-transform-space{position:absolute;left:50%;top:50%;width:0;height:0;transform:translate3d(0,0,0);will-change:transform;transform-origin:0 0}
.viewer-canvas-wrap{position:absolute;left:50%;top:50%;margin:0;transform:translate(-50%,-50%);transform-origin:center center;will-change:transform;box-shadow:0 28px 90px rgba(0,0,0,.6);overflow:hidden;background:#000}
.viewer-canvas-wrap img,#annotation-canvas,#annotation-live-canvas{position:absolute;inset:0;width:100%;height:100%;display:block}
.viewer-canvas-wrap img{object-fit:contain;pointer-events:none;user-select:none;-webkit-user-drag:none}
#annotation-canvas{pointer-events:none;touch-action:none}
#annotation-live-canvas{pointer-events:none;touch-action:none;cursor:crosshair}
#annotation-live-canvas.annotating{pointer-events:auto}
.viewer-stage.annotation-active{cursor:crosshair}
.viewer-stage.is-zoomed{cursor:grab}.viewer-stage.is-zoomed:active{cursor:grabbing}.viewer-stage.annotation-active{cursor:crosshair}
.guided-chunks{position:absolute;z-index:25;left:50%;bottom:12px;transform:translateX(-50%);display:flex;align-items:center;gap:5px;padding:5px;border:1px solid rgba(255,255,255,.11);border-radius:999px;background:rgba(18,18,23,.78);box-shadow:0 14px 45px rgba(0,0,0,.38);backdrop-filter:blur(24px);-webkit-backdrop-filter:blur(24px);max-width:calc(100% - 30px);overflow-x:auto;scrollbar-width:none}
.guided-chunks::-webkit-scrollbar{display:none}.guided-chunks[hidden]{display:none!important}.guided-chunks button{height:34px;padding:0 12px;border:0;border-radius:999px;background:transparent;color:#7f7f89;font-size:.65rem;font-weight:620;white-space:nowrap}.guided-chunks button.active{background:rgba(10,132,255,.18);color:#c9efff;box-shadow:inset 0 0 0 1px rgba(100,210,255,.15)}
.viewer-fit-fab{position:absolute;z-index:26;right:16px;bottom:15px;min-height:38px;padding:0 14px;border-radius:999px;border:1px solid rgba(100,210,255,.2);background:rgba(18,18,23,.8);color:#c7efff;display:flex;align-items:center;gap:7px;font-size:.68rem;font-weight:650;backdrop-filter:blur(20px)}.viewer-fit-fab svg{width:16px;height:16px}.viewer-fit-fab[hidden]{display:none!important}
.gesture-coach{position:absolute;z-index:35;left:50%;top:50%;transform:translate(-50%,-50%);display:flex;align-items:center;gap:12px;padding:13px 16px;border-radius:18px;border:1px solid rgba(255,255,255,.13);background:rgba(20,20,25,.88);box-shadow:0 24px 70px rgba(0,0,0,.5);backdrop-filter:blur(28px);animation:gesture-in .25s ease-out;transition:opacity .35s,transform .35s}.gesture-coach[hidden]{display:none!important}.gesture-coach.leaving{opacity:0;transform:translate(-50%,-50%) scale(.96)}.gesture-coach>span{width:38px;height:38px;border-radius:13px;display:grid;place-items:center;color:#bdeaff;background:rgba(10,132,255,.14)}.gesture-coach svg{width:20px;height:20px}.gesture-coach b{display:block;font-size:.76rem}.gesture-coach small{display:block;margin-top:3px;color:#777781;font-size:.62rem}
@keyframes gesture-in{from{opacity:0;transform:translate(-50%,-44%) scale(.96)}to{opacity:1;transform:translate(-50%,-50%)}}
.recall-hint-button{margin:0 auto 14px;min-height:38px;padding:0 14px;border-radius:999px;border:1px solid rgba(255,159,10,.2);background:rgba(255,159,10,.08);color:#ffd18a;display:inline-flex;align-items:center;gap:7px;font-size:.7rem;font-weight:650}.recall-hint-button svg{width:16px;height:16px}.recall-hint{max-width:48ch!important;margin:-4px auto 17px!important;padding:12px 14px;border-radius:14px;background:rgba(255,159,10,.07);border:1px solid rgba(255,159,10,.16);color:#e4cba5!important;font-size:.78rem!important;line-height:1.45!important}.recall-hint[hidden]{display:none!important}
.annotation-palette{z-index:60;top:auto;right:18px;bottom:18px;width:min(350px,calc(100vw - 36px));border-radius:24px;background:rgba(23,23,29,.94);box-shadow:0 28px 90px rgba(0,0,0,.6)}
.mobile-done-annotation{display:none}.annotation-clear-action{width:100%;justify-content:center}.palette-actions{display:grid;grid-template-columns:repeat(3,1fr);gap:6px}.palette-actions .tool-button{justify-content:center}
.viewer-more-menu{z-index:62}.viewer-more-menu[hidden],.annotation-palette[hidden],.notes-sheet[hidden]{display:none!important}
.session-complete-overlay{position:absolute;inset:0;z-index:80;display:grid;place-items:center;padding:20px;background:rgba(2,2,4,.78);backdrop-filter:blur(20px);animation:session-overlay-in .28s ease-out}.session-complete-card{width:min(480px,92vw);padding:38px;border-radius:31px;border:1px solid rgba(255,255,255,.14);background:linear-gradient(155deg,rgba(25,31,39,.98),rgba(14,14,19,.98));box-shadow:0 36px 110px rgba(0,0,0,.62);text-align:center}.mastery-tick{width:58px;height:58px;border-radius:19px;margin:0 auto 19px;display:grid;place-items:center;color:#bdf7ca;background:rgba(48,209,88,.14);border:1px solid rgba(48,209,88,.22);box-shadow:0 0 32px rgba(48,209,88,.13)}.mastery-tick svg{width:27px;height:27px}.session-complete-card h2{font-size:2.25rem;letter-spacing:-.055em;margin:9px 0 12px}.session-complete-card p{margin:0 0 24px;color:#8e8e98;line-height:1.5}@keyframes session-overlay-in{from{opacity:0}to{opacity:1}}
.viewer.rating-acknowledged .viewer-stage{animation:rating-glow .38s cubic-bezier(.2,.8,.2,1)}.viewer[data-rating="good"].rating-acknowledged .session-progress-segments,.viewer[data-rating="easy"].rating-acknowledged .session-progress-segments{filter:drop-shadow(0 0 7px rgba(48,209,88,.25))}@keyframes rating-glow{0%,100%{box-shadow:inset 0 0 0 rgba(56,189,248,0)}48%{box-shadow:inset 0 0 42px rgba(56,189,248,.055)}}
.viewer.is-recall .viewer-footer{opacity:.25;pointer-events:none}.viewer.is-recall .guided-chunks{display:none}
.viewer.controls-hidden .viewer-header,.viewer.controls-hidden .guided-chunks,.viewer.controls-hidden .viewer-fit-fab{opacity:0;pointer-events:none;transform:translateY(-6px)}
.viewer-header,.guided-chunks,.viewer-fit-fab{transition:opacity .22s ease,transform .22s ease}

/* Mobile: slide first, controls on demand */
@media(max-width:680px){
  .main-content{padding-top:26px}
  .today-heading{align-items:flex-start}.today-date{display:none}.today-heading h1{font-size:2.75rem}.today-heading p{font-size:.83rem}
  .today-primary-card{grid-template-columns:1fr;min-height:0;padding:25px 20px 20px;border-radius:28px;gap:24px}
  .today-primary-copy h2{font-size:2.65rem;margin-top:17px}.today-primary-copy>p{font-size:.82rem;line-height:1.5}.today-session-meta{margin:18px 0 17px}.today-session-meta span{font-size:.61rem;padding:7px 9px}.today-start-button{width:100%;min-height:50px}.today-change-link{display:block;width:100%;margin:5px 0 0}
  .today-primary-visual{min-height:170px;order:-1}.today-primary-visual img{width:92%;border-radius:16px;transform:rotateY(-4deg) rotateZ(.5deg)}.today-ring{width:78px;height:78px;right:1px;bottom:0}.today-ring::before{width:64px;height:64px}.today-ring b{font-size:1rem}.today-ring small{font-size:.49rem}
  .session-options-sheet{grid-template-columns:1fr 1fr}.session-options-sheet button{min-height:74px;padding:13px}
  .today-snapshot{grid-template-columns:1fr 1fr}.today-snapshot article{min-height:78px;padding:13px}.today-snapshot article>span{width:34px;height:34px}.today-snapshot strong{font-size:1.1rem}
  .next-step-card{grid-template-columns:auto minmax(0,1fr);padding:18px;gap:13px}.next-step-card>.button{grid-column:1/-1;width:100%}.next-step-copy h3{font-size:1.05rem}.next-step-copy p{font-size:.67rem}
  .today-more summary{align-items:flex-start}.today-more summary small{max-width:160px;text-align:right}.today-more-grid{grid-template-columns:1fr 1fr}.today-plan-line{align-items:flex-start;gap:12px}
  .insight-next-grid{grid-template-columns:1fr}.insight-action{min-height:0;padding:25px 21px;border-radius:26px}.insight-action h2{font-size:2.25rem}.insight-summary{grid-template-columns:1fr 1fr}.insight-detail-grid{grid-template-columns:1fr}.insight-panel:first-child{grid-row:auto}.mastery-bars>div{grid-template-columns:110px minmax(0,1fr) 34px}.insight-details summary{align-items:flex-start;gap:12px}.insight-details summary small{max-width:150px;text-align:right}

  .viewer{width:100%;height:var(--viewer-vh,100dvh);margin:0;border-radius:0;border:0;grid-template-rows:auto minmax(0,1fr) auto}
  .viewer-header{grid-template-columns:auto minmax(0,1fr) auto;min-height:54px;padding:max(7px,env(safe-area-inset-top)) 8px 7px;gap:7px;background:rgba(8,8,11,.76)}
  .viewer-title{min-width:0}.viewer-title span{display:none}.viewer-title h2{font-size:.82rem;margin:0;max-width:none;text-align:left;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .viewer-session-progress{position:absolute;left:50%;top:max(7px,env(safe-area-inset-top));transform:translateX(-50%);width:min(42vw,190px);pointer-events:none}.session-progress-copy b{display:none}.session-progress-copy span{font-size:.57rem}.session-progress-segments{gap:3px}.session-segment{height:3px}
  .viewer-header-actions{gap:3px}.viewer-header-actions .button{width:38px;height:38px;padding:0;display:grid;place-items:center;font-size:0}.viewer-header-actions .button svg{width:18px;height:18px}.viewer-exit-button,.viewer-header-actions .icon-button{width:38px;height:38px}.desktop-focus-button{display:none!important}.mobile-annotate-button{display:grid}
  .viewer-toolbar{display:none!important}.viewer-stage{padding:0;min-height:0}.viewer-footer{position:relative;z-index:45;min-height:78px;max-height:none;overflow:visible;padding:8px 8px calc(8px + env(safe-area-inset-bottom));background:rgba(10,10,13,.91);backdrop-filter:blur(24px);-webkit-backdrop-filter:blur(24px)}
  .viewer-footer-grid{display:grid;grid-template-columns:1fr;gap:5px}.viewer-actions{display:none}.confidence-control{grid-column:1;grid-row:1}.confidence-control>span{font-size:.62rem;margin-bottom:5px}.confidence-control>div{display:grid;grid-template-columns:repeat(4,1fr);gap:4px;padding:0;background:transparent;border:0}.confidence-button{min-height:38px;padding:0 5px;border-radius:11px;background:rgba(255,255,255,.05);border:1px solid var(--v3-line);justify-content:center;font-size:.61rem}.confidence-button span{font-size:.72rem}.confidence-control>small{display:none}.viewer-navigation{position:absolute;inset:auto 8px calc(9px + env(safe-area-inset-bottom));pointer-events:none;display:flex;justify-content:space-between}.viewer-navigation .button{pointer-events:auto;width:36px;height:36px;min-height:36px;padding:0;border-radius:50%;font-size:0;background:rgba(255,255,255,.05)}.viewer-navigation>span{display:none}.viewer-shortcuts{display:none}
  .viewer.is-recall{grid-template-rows:auto minmax(0,1fr)}.viewer.is-recall .viewer-footer{display:none}
  .guided-chunks{left:8px;right:8px;bottom:8px;transform:none;max-width:none;border-radius:16px;justify-content:flex-start}.guided-chunks button{height:32px;padding:0 10px;font-size:.59rem}.viewer-fit-fab{right:10px;bottom:54px;min-height:36px;padding:0 12px}
  .gesture-coach{max-width:calc(100% - 28px);padding:11px 13px}.gesture-coach>span{width:34px;height:34px}
  .annotation-palette{position:fixed;left:7px;right:7px;bottom:calc(7px + env(safe-area-inset-bottom));width:auto;max-height:74dvh;overflow:auto;padding:12px;border-radius:25px;box-shadow:0 -26px 80px rgba(0,0,0,.68)}.palette-tools{gap:5px}.palette-tools .tool-button{min-height:42px}.palette-controls{grid-template-columns:1fr 1fr}.palette-actions{grid-template-columns:repeat(3,1fr)}.desktop-export-annotation{display:none}.mobile-done-annotation{display:flex}.annotation-clear-action{margin-top:2px}
  .viewer-more-menu{position:fixed;top:auto;bottom:calc(7px + env(safe-area-inset-bottom));left:7px;right:7px;width:auto;max-height:76dvh;overflow:auto;border-radius:25px;padding:13px}.notes-sheet{position:fixed;left:7px;right:7px;bottom:calc(7px + env(safe-area-inset-bottom));width:auto;max-height:78dvh;overflow:auto;border-radius:27px}
  .recall-curtain{padding:12px}.recall-card{width:min(560px,96vw);padding:24px 18px 21px;border-radius:25px}.recall-card h3{font-size:2.15rem}.recall-card p{font-size:.84rem;line-height:1.48}.recall-cues{margin:16px 0 14px}.recall-cues span{padding:6px 8px;font-size:.56rem}.recall-hint{font-size:.71rem!important}.recall-card>small{font-size:.55rem}
}

/* True landscape study mode: the slide owns the viewport */
@media(max-height:680px) and (orientation:landscape){
  .viewer.landscape-study{position:fixed;inset:0;width:var(--viewer-vw,100vw);height:var(--viewer-vh,100dvh);grid-template-rows:minmax(0,1fr);background:#000}
  .viewer.landscape-study .viewer-header{position:absolute;z-index:70;left:0;right:0;top:0;min-height:44px;padding:max(4px,env(safe-area-inset-top)) max(8px,env(safe-area-inset-right)) 4px max(8px,env(safe-area-inset-left));background:linear-gradient(180deg,rgba(0,0,0,.82),rgba(0,0,0,.18),transparent);border:0}
  .viewer.landscape-study .viewer-title{display:none}.viewer.landscape-study .viewer-session-progress{top:max(5px,env(safe-area-inset-top));width:min(34vw,220px)}
  .viewer.landscape-study .viewer-toolbar,.viewer.landscape-study .viewer-footer{display:none!important}.viewer.landscape-study .viewer-stage{grid-row:1;position:absolute;inset:0;padding:0}
  .viewer.landscape-study .guided-chunks{bottom:max(7px,env(safe-area-inset-bottom));background:rgba(8,8,11,.68)}.viewer.landscape-study .viewer-fit-fab{bottom:max(8px,env(safe-area-inset-bottom));right:max(10px,env(safe-area-inset-right))}
  .viewer.landscape-study .annotation-palette{left:auto;right:max(7px,env(safe-area-inset-right));bottom:max(7px,env(safe-area-inset-bottom));width:min(420px,48vw);max-height:88dvh}
  .viewer.landscape-study .viewer-more-menu{left:auto;right:max(7px,env(safe-area-inset-right));bottom:max(7px,env(safe-area-inset-bottom));width:min(390px,46vw);max-height:90dvh}
  .viewer.landscape-study .notes-sheet{left:auto;right:max(7px,env(safe-area-inset-right));bottom:max(7px,env(safe-area-inset-bottom));width:min(430px,48vw);max-height:88dvh}
  .viewer.landscape-study.is-recall .viewer-header{opacity:1}.viewer.landscape-study .recall-card{width:min(720px,78vw);padding:22px 28px}.viewer.landscape-study .recall-card h3{font-size:2.25rem;margin:7px 0 10px}.viewer.landscape-study .recall-card p{font-size:.82rem;line-height:1.45}.viewer.landscape-study .recall-cues{margin:12px 0}.viewer.landscape-study .recall-card>small{display:none}
}

@media(prefers-reduced-motion:reduce){.today-primary-card,.today-primary-visual img,.session-segment,.viewer-canvas-wrap,.gesture-coach{transition:none!important;animation:none!important}}

/* V4.4 progressive visual loading: show the responsive preview immediately,
   then cross-fade to the full 1920×1080 lesson without a blank stage. */
.viewer-canvas-wrap .slide-placeholder{z-index:0;object-fit:contain;filter:blur(5px) saturate(.82);transform:scale(1.012);opacity:.82;transition:opacity .24s ease,filter .24s ease}
.viewer-canvas-wrap .slide-full{z-index:1;opacity:0;transition:opacity .22s ease}
.viewer-canvas-wrap.image-ready .slide-full{opacity:1}
.viewer-canvas-wrap.image-ready .slide-placeholder{opacity:0;filter:blur(0);pointer-events:none}
#annotation-canvas{z-index:2}#annotation-live-canvas{z-index:3}

/* Landscape rating is progressively disclosed so students can finish a full
   review cycle without rotating back to portrait. */
.landscape-rate-button,.landscape-rate-sheet{display:none}
.landscape-rate-sheet[hidden]{display:none!important}
@media(max-height:680px) and (orientation:landscape){
  .viewer.landscape-study:not(.is-recall) .landscape-rate-button{display:grid}
  .viewer.landscape-study .landscape-rate-sheet{position:absolute;z-index:78;left:50%;bottom:max(9px,env(safe-area-inset-bottom));transform:translateX(-50%);display:flex;align-items:center;gap:10px;padding:8px 10px 8px 14px;border:1px solid rgba(255,255,255,.13);border-radius:18px;background:rgba(10,10,14,.84);box-shadow:0 18px 60px rgba(0,0,0,.58);backdrop-filter:blur(24px);-webkit-backdrop-filter:blur(24px)}
  .viewer.landscape-study .landscape-rate-sheet>span{color:#aaaab4;font-size:.64rem;white-space:nowrap}
  .viewer.landscape-study .landscape-rate-sheet>div{display:grid;grid-template-columns:repeat(4,minmax(58px,1fr));gap:5px}
  .viewer.landscape-study .landscape-rate-sheet .confidence-button{min-height:36px;padding:0 9px;border-radius:11px;background:rgba(255,255,255,.055);border:1px solid rgba(255,255,255,.1);font-size:.61rem;justify-content:center}
  .viewer.landscape-study .landscape-rate-sheet .confidence-button span{font-size:.72rem}
  .viewer.landscape-study.controls-hidden .landscape-rate-sheet{opacity:0;pointer-events:none}
}

/* The returning-student screen removes global search from the primary path.
   Search remains one tap away in Library, while Today stays action-first. */
.topbar.today-context .global-search{display:none}
.topbar.today-context .topbar-context{flex:1}
@media(max-width:900px){
  .topbar.today-context .topbar-context{display:flex}
  .topbar.today-context .topbar-context small{display:none}
  .topbar.today-context .topbar-context b{font-size:.82rem;color:#d7d7dd}
}

/* Grid repair: older viewer rules reserved a hidden toolbar row on phones,
   which could allocate the flexible height to the footer instead of the slide.
   Explicit row placement guarantees the visual owns the remaining viewport. */
@media(max-width:680px){
  .slide-modal .viewer{grid-template-rows:auto minmax(0,1fr) auto!important}
  .slide-modal .viewer>.viewer-header{grid-row:1}
  .slide-modal .viewer>.viewer-toolbar{display:none!important}
  .slide-modal .viewer>.viewer-stage{grid-row:2;min-height:0!important}
  .slide-modal .viewer>.viewer-footer{grid-row:3;align-self:end;height:auto!important;min-height:78px;max-height:96px!important}
  .slide-modal .viewer.is-recall{grid-template-rows:auto minmax(0,1fr)!important}
  .slide-modal .viewer.is-recall>.viewer-footer{display:none!important}
}
@media(max-height:680px) and (orientation:landscape){
  .slide-modal .viewer.landscape-study{grid-template-rows:minmax(0,1fr)!important}
  .slide-modal .viewer.landscape-study>.viewer-stage{grid-row:1!important}
}

/* V4.4 final mobile return-flow refinement: the recommended session button
   stays fully visible above the persistent tab bar on a standard iPhone. */
@media(max-width:680px){
  .main-content{padding-top:14px;padding-bottom:104px}
  .today-page{gap:13px}
  .today-heading{margin-bottom:0}
  .today-heading h1{font-size:2.22rem;line-height:.96;margin:4px 0 4px}
  .today-heading p{font-size:.72rem;line-height:1.35}
  .today-primary-card{padding:16px 15px 14px;border-radius:24px;gap:11px}
  .today-primary-visual{min-height:105px}
  .today-primary-visual img{width:76%;border-radius:12px;box-shadow:0 22px 58px rgba(0,0,0,.5)}
  .today-ring{width:58px;height:58px;right:5px;bottom:0}
  .today-ring::before{width:48px;height:48px}
  .today-ring b{font-size:.8rem}
  .today-ring small{font-size:.41rem}
  .today-kicker{padding:6px 9px;gap:7px;font-size:.56rem;letter-spacing:.065em}
  .live-dot{width:6px;height:6px}
  .today-primary-copy h2{font-size:2.02rem;line-height:.94;margin:10px 0 7px;letter-spacing:-.062em}
  .today-primary-copy>p{font-size:.72rem;line-height:1.38;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
  .today-session-meta{margin:9px 0 10px;gap:5px;flex-wrap:nowrap}
  .today-session-meta span{min-width:0;padding:6px 7px;font-size:.54rem;gap:5px;white-space:nowrap}
  .today-session-meta span:nth-child(3){display:none}
  .today-session-meta svg{width:13px;height:13px}
  .today-start-button{min-height:46px;padding:0 14px;font-size:.7rem}
  .today-change-link{margin:2px 0 0;padding:7px;font-size:.65rem}
}
@media(max-width:390px) and (max-height:760px){
  .today-heading p{display:none}
  .today-primary-visual{min-height:94px}
  .today-primary-visual img{width:70%}
  .today-primary-copy>p{-webkit-line-clamp:1}
}

/* ========================================================================== 
   V4.5 IPHONE EDGE-TO-EDGE VIEWER — Apple-grade visual viewport anchoring,
   safe-area-aware fitting, instant edge controls and a contextual thumb dock.
   ========================================================================== */

/* The modal is explicitly attached to the visual viewport by JS. This avoids
   Safari leaving a stale strip after rotation or browser-bar transitions. */
.slide-modal{
  inset:0 auto auto 0!important;
  width:var(--visual-vw,100vw);
  height:var(--visual-vh,100dvh);
  transform-origin:0 0;
  overflow:hidden;
  background:#000;
  contain:layout paint style;
}
.slide-modal .modal-backdrop{inset:0;background:#000}
.slide-modal .viewer{inset:0!important;top:0!important;width:100%!important;height:100%!important;margin:0!important}

/* Readable JS probe for WebKit environment insets. */
.viewer-safe-area-probe{
  position:absolute;
  left:0;top:0;
  width:0;height:0;
  padding-top:env(safe-area-inset-top,0px);
  padding-right:env(safe-area-inset-right,0px);
  padding-bottom:env(safe-area-inset-bottom,0px);
  padding-left:env(safe-area-inset-left,0px);
  visibility:hidden;
  pointer-events:none;
}

/* Side gutters feel intentional rather than like unused black bars. The small
   preview is static and low-opacity, avoiding an expensive live blur. */
.viewer-ambient{
  position:absolute;
  z-index:0;
  inset:-34px;
  pointer-events:none;
  background-image:
    linear-gradient(90deg,rgba(0,0,0,.84),rgba(0,0,0,.42) 28%,rgba(0,0,0,.42) 72%,rgba(0,0,0,.84)),
    linear-gradient(rgba(0,0,0,.22),rgba(0,0,0,.22)),
    var(--viewer-ambient-image);
  background-size:cover;
  background-position:center;
  filter:blur(24px) saturate(.82) brightness(.55);
  transform:scale(1.08);
  opacity:.12;
  transition:opacity .28s ease;
}
.viewer.landscape-study .viewer-ambient{opacity:.31}
.viewer.fill-screen-mode .viewer-ambient{opacity:.08}
.viewer-transform-space{z-index:10}

/* Edge tap zones remain available even when drawing. The visual affordance is
   deliberately quiet; it becomes slightly clearer when the controls hide. */
.viewer-edge-zone{
  position:absolute;
  z-index:44;
  top:0;bottom:0;
  width:34px;
  touch-action:none;
  -webkit-tap-highlight-color:transparent;
  user-select:none;
  pointer-events:none;
}
.viewer-edge-zone-left{left:0;width:var(--viewer-edge-left,34px)}
.viewer-edge-zone-right{right:0;width:var(--viewer-edge-right,34px)}
.viewer-edge-zone span{
  position:absolute;
  top:50%;
  width:3px;height:36px;
  border-radius:999px;
  background:rgba(255,255,255,.28);
  box-shadow:0 0 18px rgba(100,210,255,.11);
  opacity:.18;
  transform:translateY(-50%) scaleY(.82);
  transition:opacity .2s ease,transform .2s ease,background .2s ease;
}
.viewer-edge-zone-left span{left:max(7px,env(safe-area-inset-left))}
.viewer-edge-zone-right span{right:max(7px,env(safe-area-inset-right))}
.viewer.controls-hidden .viewer-edge-zone span{opacity:.68;transform:translateY(-50%) scaleY(1);background:rgba(190,236,255,.64)}
.viewer.edge-awake .viewer-edge-zone span{opacity:1;transform:translateY(-50%) scaleY(1.18);background:#c9efff}
@media(pointer:fine){.viewer-edge-zone{display:none}}

/* The contextual dock replaces a top-heavy landscape toolbar. */
.viewer-floating-dock{
  display:none;
  position:absolute;
  z-index:72;
  left:50%;
  bottom:calc(max(8px,env(safe-area-inset-bottom)) + 1px);
  transform:translateX(-50%);
  align-items:center;
  gap:4px;
  min-height:50px;
  padding:5px;
  border:1px solid rgba(255,255,255,.15);
  border-radius:18px;
  background:rgba(15,15,19,.78);
  box-shadow:0 18px 64px rgba(0,0,0,.58),inset 0 1px rgba(255,255,255,.06);
  backdrop-filter:blur(26px) saturate(160%);
  -webkit-backdrop-filter:blur(26px) saturate(160%);
  transition:opacity .2s ease,transform .2s ease;
}
.dock-action{
  min-width:58px;
  height:44px;
  padding:0 9px;
  display:grid;
  grid-template-columns:auto auto;
  place-content:center;
  align-items:center;
  gap:6px;
  border:0;
  border-radius:13px;
  background:transparent;
  color:#c8c8d0;
  font-size:.61rem;
  font-weight:650;
  -webkit-tap-highlight-color:transparent;
}
.dock-action svg{width:18px;height:18px}
.dock-action:hover,.dock-action:focus-visible,.dock-action.active{background:rgba(255,255,255,.085);color:#fff}
.dock-action.active{box-shadow:inset 0 0 0 1px rgba(100,210,255,.18);color:#c9efff}
.viewer.fill-screen-mode .dock-action[data-action="fit-screen"]{background:rgba(10,132,255,.16);color:#c9efff}

/* Viewport fitting is intentionally transition-free while Safari is settling.
   This prevents the slide visibly chasing intermediate rotation sizes. */
.viewer.viewport-settling .viewer-canvas-wrap,
.viewer.viewport-settling .viewer-transform-space{transition:none!important}

/* All touch controls meet Apple's minimum target size. */
@media(pointer:coarse){
  .viewer .icon-button,.viewer .dock-action,.viewer .confidence-button,.viewer .guided-chunks button{min-width:44px;min-height:44px}
}

/* Class-driven landscape mode applies to iPhone and iPad rather than relying
   on a narrow max-height media query. */
.viewer.landscape-study{
  position:absolute!important;
  inset:0!important;
  width:100%!important;
  height:100%!important;
  grid-template-rows:minmax(0,1fr)!important;
  background:#000;
}
.viewer.landscape-study .viewer-stage{
  position:absolute!important;
  z-index:1;
  inset:0!important;
  grid-row:1!important;
  padding:0!important;
  background:#000;
}
.viewer.landscape-study .viewer-header{
  position:absolute;
  z-index:76;
  left:0;right:0;top:0;
  min-height:48px;
  padding:max(4px,env(safe-area-inset-top)) max(9px,env(safe-area-inset-right)) 4px max(9px,env(safe-area-inset-left));
  background:linear-gradient(180deg,rgba(0,0,0,.84),rgba(0,0,0,.26) 66%,transparent);
  border:0;
}
.viewer.landscape-study .viewer-title{display:none}
.viewer.landscape-study .viewer-session-progress{top:max(5px,env(safe-area-inset-top));width:min(34vw,230px)}
.viewer.landscape-study .viewer-toolbar,.viewer.landscape-study .viewer-footer{display:none!important}
.viewer.landscape-study .viewer-floating-dock{display:flex}
.viewer.landscape-study .mobile-annotate-button,
.viewer.landscape-study .viewer-header-actions>[data-action="toggle-viewer-more"]{display:none!important}
.viewer.landscape-study:not(.is-recall) .landscape-rate-button{display:grid!important}
.viewer.landscape-study .guided-chunks{
  top:calc(max(5px,env(safe-area-inset-top)) + 47px);
  bottom:auto!important;
  left:50%;right:auto;
  transform:translateX(-50%);
  width:max-content;
  max-width:min(720px,calc(100% - env(safe-area-inset-left) - env(safe-area-inset-right) - 32px));
  background:rgba(9,9,12,.67);
}
.viewer.landscape-study .viewer-fit-fab{display:none!important}
.viewer.landscape-study .annotation-palette,
.viewer.landscape-study .viewer-more-menu,
.viewer.landscape-study .notes-sheet{
  position:absolute!important;
  top:auto!important;
  left:auto!important;
  right:max(8px,env(safe-area-inset-right))!important;
  bottom:max(8px,env(safe-area-inset-bottom))!important;
  width:min(420px,48vw)!important;
  max-height:calc(100% - env(safe-area-inset-top) - env(safe-area-inset-bottom) - 18px)!important;
}
.viewer.landscape-study .viewer-more-menu{width:min(400px,46vw)!important}
.viewer.landscape-study .notes-sheet{width:min(440px,50vw)!important}
.viewer.landscape-study .landscape-rate-sheet{
  display:flex!important;
  position:absolute;
  z-index:78;
  left:50%;
  bottom:calc(max(8px,env(safe-area-inset-bottom)) + 61px);
  transform:translateX(-50%);
  align-items:center;
  gap:10px;
  padding:8px 10px 8px 14px;
  border:1px solid rgba(255,255,255,.14);
  border-radius:18px;
  background:rgba(10,10,14,.84);
  box-shadow:0 18px 60px rgba(0,0,0,.58);
  backdrop-filter:blur(24px);
  -webkit-backdrop-filter:blur(24px);
}
.viewer.landscape-study .landscape-rate-sheet[hidden]{display:none!important}
.viewer.landscape-study .landscape-rate-sheet>span{color:#aaaab4;font-size:.64rem;white-space:nowrap}
.viewer.landscape-study .landscape-rate-sheet>div{display:grid;grid-template-columns:repeat(4,minmax(58px,1fr));gap:5px}
.viewer.landscape-study .landscape-rate-sheet .confidence-button{min-height:38px;padding:0 9px;border-radius:11px;background:rgba(255,255,255,.055);border:1px solid rgba(255,255,255,.1);font-size:.61rem;justify-content:center}
.viewer.landscape-study.landscape-rate-open .viewer-floating-dock{opacity:0;pointer-events:none;transform:translate(-50%,7px)}

/* Controls fade, but the side handles remain as an always-available recovery
   affordance. */
.viewer.controls-hidden .viewer-header,
.viewer.controls-hidden .guided-chunks,
.viewer.controls-hidden .viewer-fit-fab,
.viewer.controls-hidden .viewer-floating-dock,
.viewer.controls-hidden .landscape-rate-sheet{
  opacity:0!important;
  pointer-events:none!important;
}
.viewer.controls-hidden .viewer-header,.viewer.controls-hidden .guided-chunks{transform:translateY(-6px)}
.viewer.controls-hidden .viewer-floating-dock{transform:translate(-50%,8px)}
.viewer-header,.guided-chunks,.viewer-fit-fab,.viewer-floating-dock,.landscape-rate-sheet{transition:opacity .22s ease,transform .22s ease}

/* Recall remains calm in landscape while keeping the safe edges tappable. */
.viewer.landscape-study.is-recall .viewer-header{opacity:1}
.viewer.landscape-study .recall-card{width:min(720px,78vw);padding:22px 28px}
.viewer.landscape-study .recall-card h3{font-size:2.25rem;margin:7px 0 10px}
.viewer.landscape-study .recall-card p{font-size:.82rem;line-height:1.45}
.viewer.landscape-study .recall-cues{margin:12px 0}
.viewer.landscape-study .recall-card>small{display:none}

/* iPad gets the same immersive system with slightly larger touch controls. */
.viewer.tablet-landscape .viewer-floating-dock{min-height:56px;padding:6px;border-radius:20px}
.viewer.tablet-landscape .dock-action{min-width:72px;height:48px;font-size:.66rem}
.viewer.tablet-landscape .dock-action svg{width:20px;height:20px}

@media(max-width:680px) and (orientation:portrait){
  .viewer-edge-zone{width:30px}
  .viewer-edge-zone-left{width:var(--viewer-edge-left,30px)}
  .viewer-edge-zone-right{width:var(--viewer-edge-right,30px)}
  .viewer-ambient{opacity:.06}
}

@media(prefers-reduced-motion:reduce){
  .viewer-floating-dock,.viewer-edge-zone span,.viewer-ambient{transition:none!important}
}

/* V4.5 hardening: the gesture engine owns all movement. Prevent WebKit from
   preserving native scroll offsets after switching between Fill and Complete. */
.slide-modal .viewer-stage{overflow:hidden!important;overscroll-behavior:none!important;-webkit-overflow-scrolling:auto!important}

/* --------------------------------------------------------------------------
   V4.7 SIGNED + FORENSIC RENDER DELIVERY
   Clean 1920×1080 assets are no longer deployed with the public web shell.
   -------------------------------------------------------------------------- */

.protected-preview,
.protected-slide,
.viewer-stage,
.topic-image img {
  -webkit-user-drag: none;
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  user-select: none;
}

.protected-preview {
  filter: saturate(.9) contrast(.94);
}

.viewer-canvas-wrap .protected-slide:not([src]),
.viewer-canvas-wrap .protected-slide[src=""] {
  opacity: 0;
}

.secure-slide-loader {
  position: absolute;
  inset: 0;
  z-index: 14;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 24px;
  color: #f4f8fb;
  text-align: left;
  background: radial-gradient(circle at 50% 45%, rgba(11,30,43,.72), rgba(1,5,9,.84) 58%, rgba(0,0,0,.9));
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: opacity .18s ease, visibility .18s ease;
}

.secure-slide-loader[hidden] { display: none !important; }
.secure-slide-loader.ready { opacity: 0; visibility: hidden; pointer-events: none; }
.secure-slide-loader.error { background: rgba(2,7,11,.94); }
.secure-slide-loader > div { max-width: 430px; display: grid; gap: 6px; }
.secure-slide-loader b { font-size: clamp(15px,2vw,20px); letter-spacing: -.01em; }
.secure-slide-loader small { color: rgba(224,236,244,.68); line-height: 1.45; }
.secure-slide-loader .button { justify-self: start; margin-top: 8px; }
.secure-loader-orb {
  width: 28px;
  height: 28px;
  flex: 0 0 28px;
  border-radius: 50%;
  border: 2px solid rgba(74,198,255,.22);
  border-top-color: #55caff;
  box-shadow: 0 0 24px rgba(48,190,255,.26);
  animation: mwsSecureSpin .8s linear infinite;
}
.secure-loader-error-icon { font-size: 30px; }
@keyframes mwsSecureSpin { to { transform: rotate(360deg); } }

.viewer-license-chip {
  position: absolute;
  z-index: 13;
  left: 50%;
  bottom: 8px;
  transform: translateX(-50%);
  max-width: calc(100% - 32px);
  padding: 5px 10px;
  border: 1px solid rgba(72,199,255,.24);
  border-radius: 999px;
  color: rgba(227,242,249,.78);
  background: rgba(1,7,11,.78);
  box-shadow: 0 8px 28px rgba(0,0,0,.3);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  pointer-events: none;
}

.personal-license-modal[hidden] { display: none !important; }
.personal-license-modal {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: grid;
  place-items: center;
  padding: max(18px, env(safe-area-inset-top)) max(18px, env(safe-area-inset-right)) max(18px, env(safe-area-inset-bottom)) max(18px, env(safe-area-inset-left));
}
.license-notice-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0,3,6,.78);
  backdrop-filter: blur(18px) saturate(.8);
  -webkit-backdrop-filter: blur(18px) saturate(.8);
}
.license-notice-card {
  position: relative;
  width: min(620px,100%);
  padding: clamp(24px,5vw,42px);
  border: 1px solid rgba(87,200,255,.2);
  border-radius: 28px;
  background: linear-gradient(145deg,rgba(14,25,34,.98),rgba(3,8,12,.98));
  box-shadow: 0 36px 100px rgba(0,0,0,.62), inset 0 1px rgba(255,255,255,.05);
  display: grid;
  gap: 15px;
}
.license-shield {
  width: 54px;
  height: 54px;
  display: grid;
  place-items: center;
  border-radius: 17px;
  color: #031019;
  background: linear-gradient(145deg,#8fe0ff,#43bfff);
  box-shadow: 0 14px 38px rgba(54,190,250,.22);
}
.license-shield svg { width: 27px; }
.license-notice-card h2 { margin: 0; font-size: clamp(27px,5vw,43px); line-height: 1.02; letter-spacing: -.045em; }
.license-notice-card > p { margin: 0; color: rgba(226,237,244,.78); font-size: 15px; line-height: 1.6; }
.license-notice-card > small { color: rgba(207,222,232,.55); line-height: 1.5; }
.license-notice-points { display: grid; gap: 9px; margin: 4px 0; }
.license-notice-points span { display: flex; align-items: center; gap: 9px; color: rgba(239,247,251,.9); font-size: 14px; }
.license-notice-points svg { width: 16px; color: #5fd1ff; }
.license-notice-actions { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 5px; }

.account-security-summary {
  display: grid;
  grid-template-columns: repeat(2,minmax(0,1fr));
  gap: 9px;
  margin-top: 12px;
}
.account-security-summary > div {
  padding: 13px 14px;
  border: 1px solid rgba(102,203,249,.12);
  border-radius: 14px;
  background: rgba(5,14,20,.55);
  min-width: 0;
}
.account-security-summary span { display: block; margin-bottom: 4px; color: rgba(213,229,238,.55); font-size: 11px; text-transform: uppercase; letter-spacing: .08em; }
.account-security-summary strong { display: block; overflow: hidden; text-overflow: ellipsis; color: #eaf7fc; font-size: 12px; white-space: nowrap; }
[data-secure-delivery-status][data-status="ready"] { color: #7fe2b0; }
[data-secure-delivery-status][data-status="error"] { color: #ffb070; }
.preference-status.secure i { background: #54d69c; box-shadow: 0 0 12px rgba(84,214,156,.5); }

@media (max-width: 680px) {
  .license-notice-card { border-radius: 23px; }
  .license-notice-actions { display: grid; }
  .license-notice-actions .button { width: 100%; }
  .account-security-summary { grid-template-columns: 1fr; }
  .viewer-license-chip { bottom: max(5px,env(safe-area-inset-bottom)); font-size: 8px; }
}

@media (orientation: landscape) and (pointer: coarse) {
  .viewer-license-chip {
    left: calc(env(safe-area-inset-left) + 10px);
    bottom: max(5px,env(safe-area-inset-bottom));
    transform: none;
    max-width: 44%;
    opacity: .72;
  }
}

@media print {
  body.print-protected * { visibility: hidden !important; }
  body.print-protected::before {
    visibility: visible !important;
    content: "Med with Spence visuals are licensed for personal study and cannot be printed from the secure platform.";
    position: fixed;
    inset: 0;
    display: grid;
    place-items: center;
    padding: 10vw;
    color: #111;
    background: #fff;
    font: 700 22px/1.5 Arial,sans-serif;
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .secure-loader-orb { animation-duration: 1.8s; }
}


/* V4.7.1 — recall-screen viewport hotfix
   Keeps the reveal action visible on short desktop windows and mobile landscape. */
.viewer.is-recall{
  grid-template-rows:auto minmax(0,1fr)!important;
}
.viewer.is-recall>.viewer-toolbar,
.viewer.is-recall>.viewer-footer{
  display:none!important;
}
.viewer.is-recall>.viewer-stage{
  grid-row:2!important;
  min-height:0!important;
}
.recall-curtain{
  overflow-y:auto;
  overscroll-behavior:contain;
  -webkit-overflow-scrolling:touch;
  padding:clamp(10px,2.5vh,28px)!important;
}
.recall-card{
  width:min(680px,calc(100vw - 24px));
  max-height:calc(100% - 4px);
  padding:0!important;
  overflow:hidden;
  display:grid;
  grid-template-rows:minmax(0,1fr) auto;
}
.recall-content{
  min-height:0;
  overflow-y:auto;
  overscroll-behavior:contain;
  padding:clamp(22px,3.4vh,40px) clamp(18px,3.3vw,42px) 12px;
  scrollbar-width:thin;
  scrollbar-color:rgba(255,255,255,.18) transparent;
}
.recall-content::-webkit-scrollbar{width:6px}
.recall-content::-webkit-scrollbar-thumb{background:rgba(255,255,255,.18);border-radius:99px}
.recall-actions{
  position:relative;
  z-index:2;
  display:grid;
  justify-items:center;
  padding:12px clamp(18px,3.3vw,42px) clamp(16px,2.5vh,24px);
  border-top:1px solid rgba(255,255,255,.075);
  background:linear-gradient(180deg,rgba(16,17,23,.92),rgba(10,10,15,.98));
  box-shadow:0 -18px 38px rgba(0,0,0,.16);
}
.recall-actions .recall-hint-button{margin:0 auto 10px}
.recall-actions .recall-hint{margin:0 auto 10px!important;max-height:24vh;overflow-y:auto}
.recall-reveal-button{
  width:min(360px,100%);
  min-height:48px;
  justify-content:center;
  box-shadow:0 14px 34px rgba(10,132,255,.24);
}
.recall-actions>small{display:block;margin-top:10px;color:#70707b;font-size:.64rem;line-height:1.4}

@media(max-height:820px){
  .recall-content{padding-top:18px;padding-bottom:8px}
  .recall-orb{width:46px;height:46px;border-radius:15px;margin-bottom:12px}
  .recall-orb svg{width:22px;height:22px}
  .recall-card h3{font-size:clamp(1.9rem,4.1vh,2.75rem);margin:7px 0 11px}
  .recall-card p{font-size:clamp(.82rem,2.1vh,1rem);line-height:1.42}
  .recall-cues{margin:13px 0 4px;gap:6px}
  .recall-cues span{padding:6px 9px;font-size:.59rem}
  .recall-actions{padding-top:9px;padding-bottom:12px}
  .recall-actions .recall-hint-button{min-height:34px;margin-bottom:7px}
  .recall-reveal-button{min-height:44px}
  .recall-actions>small{display:none}
}

@media(max-height:620px) and (orientation:landscape){
  .recall-curtain{align-items:stretch;place-items:stretch center;padding:max(6px,env(safe-area-inset-top)) max(8px,env(safe-area-inset-right)) max(6px,env(safe-area-inset-bottom)) max(8px,env(safe-area-inset-left))!important}
  .recall-card{width:min(900px,92vw);height:100%;max-height:100%;grid-template-columns:minmax(0,1fr) minmax(270px,34%);grid-template-rows:minmax(0,1fr);text-align:left;border-radius:24px}
  .recall-content{padding:14px 22px;display:grid;align-content:center}
  .recall-orb{margin:0 0 8px;width:40px;height:40px}
  .recall-content .eyebrow{justify-self:start}
  .recall-card h3{font-size:clamp(1.65rem,6vh,2.5rem);margin:5px 0 8px}
  .recall-card p{margin:0;max-width:58ch;font-size:clamp(.75rem,2.7vh,.94rem);line-height:1.35}
  .recall-cues{justify-content:flex-start;margin:10px 0 0}
  .recall-actions{align-content:center;padding:14px 18px;border-top:0;border-left:1px solid rgba(255,255,255,.075)}
  .recall-actions .recall-hint{max-height:32vh}
  .recall-reveal-button{width:100%}
}

@media(max-width:680px) and (orientation:portrait){
  .recall-card{width:calc(100vw - 20px);max-height:calc(100% - 8px)}
  .recall-content{padding:20px 16px 9px}
  .recall-actions{padding:10px 16px calc(13px + env(safe-area-inset-bottom))}
  .recall-card h3{font-size:clamp(1.9rem,9vw,2.35rem)}
}

/* ================================================================
   V4.8 — SIX-CHUNK LEARNING OBJECTS
   A slide is no longer one unit. Each visual measures six clinical
   reasoning steps independently while preserving progressive disclosure.
   ================================================================ */

/* Library cards: six quiet mastery signals, not another dashboard. */
.topic-chunk-progress{display:grid;grid-template-columns:minmax(0,1fr) auto;grid-template-rows:auto auto;align-items:center;gap:5px 10px;margin:-3px 0 13px;padding:9px 10px;border:1px solid rgba(255,255,255,.055);border-radius:12px;background:rgba(255,255,255,.025)}
.topic-chunk-progress>span{display:grid;grid-template-columns:repeat(6,1fr);gap:4px;grid-column:1/3;width:100%}
.topic-chunk-progress>span i{height:4px;border-radius:999px;background:rgba(255,255,255,.085);transition:background .22s ease,box-shadow .22s ease,transform .22s ease}
.topic-chunk-progress>span i[data-state="learning"]{background:rgba(10,132,255,.48)}
.topic-chunk-progress>span i[data-state="fragile"]{background:rgba(255,159,10,.66)}
.topic-chunk-progress>span i[data-state="due"]{background:rgba(255,69,58,.72);box-shadow:0 0 10px rgba(255,69,58,.24)}
.topic-chunk-progress>span i[data-state="secure"]{background:rgba(48,209,88,.68)}
.topic-chunk-progress>span i[data-state="mastered"]{background:#68e487;box-shadow:0 0 11px rgba(48,209,88,.3)}
.topic-chunk-progress b{color:#b9b9c1;font-size:.59rem;font-weight:670}.topic-chunk-progress small{justify-self:end;color:#686873;font-size:.56rem}
.topic-tile:hover .topic-chunk-progress>span i{transform:scaleY(1.25)}
.library-grid.list-view .topic-chunk-progress{grid-column:1;margin:9px 0 0;max-width:420px}
.library-grid.list-view .topic-meta{grid-row:1/4}

/* Six measured chunks: overview is navigation; numbered items are learning. */
.guided-chunks{gap:4px;padding:5px 6px}
.guided-chunks .chunk-nav-button{position:relative;display:flex;align-items:center;gap:6px;height:38px;padding:0 10px;border:1px solid transparent;border-radius:999px;background:transparent;color:#777783;font-size:.62rem;font-weight:650;white-space:nowrap;transition:background .2s ease,color .2s ease,border-color .2s ease,transform .2s ease}
.guided-chunks .chunk-nav-button:hover{color:#d4d4db;background:rgba(255,255,255,.055)}
.guided-chunks .chunk-nav-button.active{background:rgba(10,132,255,.17);color:#d4f3ff;border-color:rgba(100,210,255,.17);box-shadow:0 7px 20px rgba(0,0,0,.2)}
.chunk-index{width:20px;height:20px;display:grid;place-items:center;border-radius:7px;background:rgba(255,255,255,.06);font-size:.57rem;color:#a4a4ad;flex:0 0 auto}
.chunk-nav-button.active .chunk-index{background:rgba(100,210,255,.16);color:#e0f7ff}
.chunk-nav-button.overview b{font-size:.55rem;color:#74747e;padding-left:1px}
.chunk-state-dot{width:7px;height:7px;border-radius:50%;background:rgba(255,255,255,.12);flex:0 0 auto;box-shadow:0 0 0 2px rgba(255,255,255,.025)}
.chunk-state-dot[data-state="learning"]{background:#0a84ff}.chunk-state-dot[data-state="fragile"]{background:#ff9f0a}.chunk-state-dot[data-state="due"]{background:#ff453a;box-shadow:0 0 10px rgba(255,69,58,.42)}.chunk-state-dot[data-state="secure"]{background:#30d158}.chunk-state-dot[data-state="mastered"]{background:#68e487;box-shadow:0 0 10px rgba(48,209,88,.38)}
.chunk-nav-button[data-state="due"]{color:#ffc2bd}.chunk-nav-button[data-state="fragile"]{color:#ffd49a}.chunk-nav-button[data-state="mastered"]{color:#a9f2bc}

/* Active chunk coach — just-in-time help without leaving the slide. */
.chunk-study-panel{--chunk-accent:#64d2ff;position:absolute;z-index:72;top:94px;right:20px;width:min(370px,calc(100% - 40px));max-height:calc(100% - 180px);overflow:auto;padding:17px;border:1px solid rgba(255,255,255,.14);border-radius:22px;background:linear-gradient(155deg,rgba(28,29,38,.95),rgba(10,10,14,.91));box-shadow:0 28px 90px rgba(0,0,0,.58),inset 0 1px rgba(255,255,255,.055);backdrop-filter:blur(28px);-webkit-backdrop-filter:blur(28px);animation:chunk-panel-in .24s cubic-bezier(.2,.8,.2,1)}
.chunk-study-panel[hidden]{display:none!important}.chunk-study-panel[data-accent="green"]{--chunk-accent:#30d158}.chunk-study-panel[data-accent="purple"]{--chunk-accent:#bf5af2}.chunk-study-panel[data-accent="blue"]{--chunk-accent:#0a84ff}.chunk-study-panel[data-accent="orange"]{--chunk-accent:#ff9f0a}.chunk-study-panel[data-accent="red"]{--chunk-accent:#ff453a}
@keyframes chunk-panel-in{from{opacity:0;transform:translateY(8px) scale(.985)}to{opacity:1;transform:none}}
.chunk-panel-head{display:flex;align-items:flex-start;justify-content:space-between;gap:14px;margin-bottom:14px}.chunk-panel-head>div{min-width:0}.chunk-panel-head strong{display:block;margin-top:4px;color:#f7f7fa;font-size:1.08rem;letter-spacing:-.025em}.chunk-step{display:block;color:var(--chunk-accent);font-size:.59rem;font-weight:760;text-transform:uppercase;letter-spacing:.09em}.chunk-panel-head .icon-button{width:36px;height:36px;min-width:36px;min-height:36px;background:rgba(255,255,255,.055)}
.chunk-prompt{margin:0 0 13px;color:#d3d3da;font-size:.81rem;line-height:1.55}.chunk-hint-button{display:inline-flex;align-items:center;gap:7px;min-height:36px;padding:0 11px;border:1px solid rgba(255,255,255,.08);border-radius:11px;background:rgba(255,255,255,.035);color:#a8a8b1;font-size:.65rem;font-weight:650}.chunk-hint-button svg{width:15px;height:15px;color:#ffd60a}.chunk-hint{margin:10px 0 0;padding:10px 11px;border-left:2px solid var(--chunk-accent);border-radius:0 10px 10px 0;background:rgba(255,255,255,.035);color:#aaaab4;font-size:.68rem;line-height:1.45}.chunk-hint[hidden]{display:none!important}
.chunk-reveal-button{width:100%;min-height:46px;margin-top:15px;justify-content:center}.chunk-study-panel>small{display:block;margin-top:9px;text-align:center;color:#666671;font-size:.57rem;line-height:1.4}
.chunk-revealed-label{display:flex;align-items:center;gap:8px;margin:1px 0 11px;color:#aaaab3;font-size:.63rem;font-weight:650}.chunk-rate-copy{margin:0 0 12px;color:#d7d7dd;font-size:.76rem;line-height:1.45}.chunk-rating-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:6px}.chunk-rating-button{min-height:44px;border:1px solid rgba(255,255,255,.09);border-radius:12px;background:rgba(255,255,255,.04);color:#9797a1;font-size:.61rem;font-weight:680;display:grid;place-items:center;gap:2px;transition:.18s ease}.chunk-rating-button span{display:block;font-size:.8rem}.chunk-rating-button:hover,.chunk-rating-button:focus-visible{background:rgba(255,255,255,.085);color:#fff}.chunk-rating-button.active{border-color:color-mix(in srgb,var(--chunk-accent) 50%,transparent);background:color-mix(in srgb,var(--chunk-accent) 14%,transparent);color:#fff;transform:translateY(-1px)}
.chunk-panel-foot{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:13px;padding-top:12px;border-top:1px solid rgba(255,255,255,.07)}.chunk-panel-foot>span{color:#70707a;font-size:.58rem;line-height:1.35}.chunk-panel-foot .text-button{display:flex;align-items:center;gap:5px;white-space:nowrap;color:#bdeeff;font-size:.62rem}.chunk-panel-foot svg{width:14px;height:14px}

/* During retrieval the image is deliberately withheld; after reveal it snaps
   to the chosen region. This is active recall, not passive zooming. */
.viewer.chunk-recall-active #viewer-transform-space{filter:blur(15px) saturate(.45) brightness(.28);pointer-events:none;transition:filter .22s ease}
.viewer.chunk-revealed #viewer-transform-space{filter:none;transition:filter .22s ease}
.viewer.chunk-study-active .viewer-footer{display:none!important}.viewer.chunk-study-active .viewer-stage{min-height:0}.viewer.chunk-recall-active .viewer-toolbar{opacity:.22;pointer-events:none}.viewer.chunk-study-active .viewer-floating-dock{opacity:.5}.viewer.chunk-study-active .guided-chunks{border-color:rgba(100,210,255,.12)}
.viewer.chunk-study-active[data-chunk-dock="left"] .chunk-study-panel{left:20px;right:auto}.viewer.chunk-study-active[data-chunk-dock="right"] .chunk-study-panel{right:20px;left:auto}
.viewer.rating-acknowledged .chunk-study-panel{box-shadow:0 28px 90px rgba(0,0,0,.58),0 0 0 1px rgba(48,209,88,.14),0 0 42px rgba(48,209,88,.08)}

/* Intelligent dashboard: chunk mastery is the evidence, not decorative data. */
.chunk-priority-card[data-chunk-tone="red"],.chunk-insight[data-chunk-tone="red"]{--chunk-card:#ff453a}.chunk-priority-card[data-chunk-tone="orange"],.chunk-insight[data-chunk-tone="orange"]{--chunk-card:#ff9f0a}.chunk-priority-card[data-chunk-tone="green"],.chunk-insight[data-chunk-tone="green"]{--chunk-card:#30d158}.chunk-priority-card[data-chunk-tone="purple"],.chunk-insight[data-chunk-tone="purple"]{--chunk-card:#bf5af2}.chunk-priority-card[data-chunk-tone="cyan"],.chunk-insight[data-chunk-tone="cyan"]{--chunk-card:#64d2ff}.chunk-priority-card[data-chunk-tone="blue"],.chunk-insight[data-chunk-tone="blue"]{--chunk-card:#0a84ff}
.chunk-priority-card .next-step-icon,.chunk-insight .insight-number{color:color-mix(in srgb,var(--chunk-card,#64d2ff) 85%,white);background:color-mix(in srgb,var(--chunk-card,#64d2ff) 13%,transparent);border-color:color-mix(in srgb,var(--chunk-card,#64d2ff) 20%,transparent)}
.chunk-insight-grid{grid-template-columns:1.1fr .9fr}.chunk-profile-panel{grid-row:span 3!important}.chunk-mastery-bars>div>span{display:flex;align-items:center;gap:8px}.chunk-order-badge{width:21px;height:21px;border-radius:7px;display:grid;place-items:center;flex:0 0 auto;background:rgba(255,255,255,.06);color:#a9a9b2;font-size:.55rem;font-style:normal}.chunk-mastery-bars>div[data-chunk-state="fragile"] i b{background:linear-gradient(90deg,#ff9f0a,#ff453a)}.chunk-mastery-bars>div[data-chunk-state="secure"] i b{background:linear-gradient(90deg,#30d158,#64d2ff)}

@media(max-width:900px){
  .topic-chunk-progress{padding:7px 8px;margin-bottom:10px}.topic-chunk-progress b{font-size:.53rem}.topic-chunk-progress small{font-size:.5rem}
  .chunk-study-panel{top:auto!important;left:10px!important;right:10px!important;bottom:61px;width:auto;max-height:min(44vh,390px);border-radius:19px;padding:14px}
  .chunk-panel-head{margin-bottom:10px}.chunk-panel-head strong{font-size:.98rem}.chunk-prompt{font-size:.73rem;line-height:1.45}.chunk-rating-button{min-height:42px}
  .chunk-insight-grid{grid-template-columns:1fr}.chunk-profile-panel{grid-row:auto!important}
}
@media(max-width:680px){
  .guided-chunks{padding:4px;gap:3px}.guided-chunks .chunk-nav-button{height:34px;min-width:auto!important;min-height:34px!important;padding:0 8px;font-size:.56rem}.chunk-index{width:18px;height:18px;font-size:.51rem}.chunk-nav-button.overview b{display:none}.chunk-state-dot{width:6px;height:6px}
  .chunk-study-panel{bottom:56px}.chunk-panel-foot{align-items:flex-start}.chunk-panel-foot>span{max-width:52%}
  .topic-chunk-progress small{display:none}.topic-chunk-progress{grid-template-columns:minmax(0,1fr) auto}.topic-chunk-progress>span{grid-column:1/3}
}
@media(orientation:landscape) and (pointer:coarse){
  .viewer.landscape-study .chunk-study-panel{top:calc(max(7px,env(safe-area-inset-top)) + 56px)!important;bottom:auto!important;width:min(360px,40vw)!important;max-height:calc(100% - env(safe-area-inset-top) - env(safe-area-inset-bottom) - 72px)!important;padding:13px!important;border-radius:18px}
  .viewer.landscape-study[data-chunk-dock="left"] .chunk-study-panel{left:max(8px,env(safe-area-inset-left))!important;right:auto!important}.viewer.landscape-study[data-chunk-dock="right"] .chunk-study-panel{right:max(8px,env(safe-area-inset-right))!important;left:auto!important}
  .viewer.landscape-study .chunk-panel-head strong{font-size:.92rem}.viewer.landscape-study .chunk-prompt{font-size:.68rem;line-height:1.4;margin-bottom:9px}.viewer.landscape-study .chunk-hint{font-size:.61rem}.viewer.landscape-study .chunk-reveal-button{min-height:40px;margin-top:10px}.viewer.landscape-study .chunk-rating-button{min-height:38px;font-size:.55rem}.viewer.landscape-study .chunk-panel-foot{margin-top:9px;padding-top:9px}
  .viewer.landscape-study .guided-chunks{max-width:calc(100% - env(safe-area-inset-left) - env(safe-area-inset-right) - 22px)}
}
@media(prefers-reduced-motion:reduce){.chunk-study-panel,.chunk-rating-button,.chunk-nav-button,.topic-chunk-progress>span i{animation:none!important;transition:none!important}}

/* ========================================================================== 
   V4.8 — SIX-CHUNK MASTERY ENGINE
   One visual becomes six independently retrievable, measurable memories.
   ========================================================================== */

:root{
  --chunk-cyan:#64d2ff;
  --chunk-green:#30d158;
  --chunk-purple:#bf5af2;
  --chunk-blue:#0a84ff;
  --chunk-orange:#ff9f0a;
  --chunk-red:#ff453a;
}

/* Library cards: quiet six-part mastery strip */
.topic-chunk-progress{
  display:grid;
  grid-template-columns:minmax(0,1fr) auto;
  gap:6px 12px;
  align-items:center;
  margin:12px 0 2px;
  padding:10px 11px;
  border:1px solid rgba(255,255,255,.075);
  border-radius:14px;
  background:linear-gradient(180deg,rgba(255,255,255,.035),rgba(255,255,255,.018));
}
.topic-chunk-progress>span{display:grid;grid-template-columns:repeat(6,1fr);gap:5px;min-width:0}
.topic-chunk-progress>span i{
  display:block;height:4px;border-radius:999px;background:rgba(255,255,255,.11);
  box-shadow:inset 0 0 0 1px rgba(255,255,255,.025);
  transition:background .25s ease,box-shadow .25s ease,transform .25s ease;
}
.topic-chunk-progress>span i[data-state="due"]{background:var(--chunk-orange);box-shadow:0 0 12px rgba(255,159,10,.28)}
.topic-chunk-progress>span i[data-state="fragile"]{background:var(--chunk-red);box-shadow:0 0 12px rgba(255,69,58,.24)}
.topic-chunk-progress>span i[data-state="learning"]{background:var(--chunk-purple)}
.topic-chunk-progress>span i[data-state="secure"]{background:var(--chunk-green)}
.topic-chunk-progress>span i[data-state="mastered"]{background:linear-gradient(90deg,var(--chunk-green),var(--chunk-cyan));box-shadow:0 0 14px rgba(48,209,88,.22)}
.topic-chunk-progress>b{font-size:.68rem;color:#d8d8df;font-weight:720;white-space:nowrap}
.topic-chunk-progress>small{grid-column:1/-1;color:#777781;font-size:.62rem;letter-spacing:.005em}
.topic-tile:hover .topic-chunk-progress>span i{transform:scaleY(1.35)}

/* Home: exact reasoning skill recommendation */
.chunk-priority-card,.chunk-insight{
  --chunk-tone:var(--v3-blue);
  position:relative;overflow:hidden;
}
.chunk-priority-card[data-chunk-tone="cyan"],.chunk-insight[data-chunk-tone="cyan"]{--chunk-tone:var(--chunk-cyan)}
.chunk-priority-card[data-chunk-tone="green"],.chunk-insight[data-chunk-tone="green"]{--chunk-tone:var(--chunk-green)}
.chunk-priority-card[data-chunk-tone="purple"],.chunk-insight[data-chunk-tone="purple"]{--chunk-tone:var(--chunk-purple)}
.chunk-priority-card[data-chunk-tone="blue"],.chunk-insight[data-chunk-tone="blue"]{--chunk-tone:var(--chunk-blue)}
.chunk-priority-card[data-chunk-tone="orange"],.chunk-insight[data-chunk-tone="orange"]{--chunk-tone:var(--chunk-orange)}
.chunk-priority-card[data-chunk-tone="red"],.chunk-insight[data-chunk-tone="red"]{--chunk-tone:var(--chunk-red)}
.chunk-priority-card::before,.chunk-insight::before{
  content:"";position:absolute;inset:-1px;pointer-events:none;
  background:radial-gradient(440px 230px at 8% 0%,color-mix(in srgb,var(--chunk-tone) 17%,transparent),transparent 68%);
  opacity:.9;
}
.chunk-priority-card>* ,.chunk-insight>*{position:relative;z-index:1}
.chunk-priority-card .next-step-icon{color:var(--chunk-tone);background:color-mix(in srgb,var(--chunk-tone) 12%,rgba(255,255,255,.04));border-color:color-mix(in srgb,var(--chunk-tone) 28%,rgba(255,255,255,.08))}

/* Progress: six-dimensional reasoning profile */
.six-chunk-dashboard{
  margin:24px 0;
  padding:clamp(22px,3vw,34px);
  border:1px solid rgba(255,255,255,.09);
  border-radius:30px;
  background:
    radial-gradient(650px 320px at 0% 0%,rgba(100,210,255,.08),transparent 68%),
    radial-gradient(520px 300px at 100% 100%,rgba(191,90,242,.07),transparent 72%),
    linear-gradient(180deg,rgba(26,27,34,.88),rgba(13,14,19,.92));
  box-shadow:0 26px 70px rgba(0,0,0,.28);
}
.six-chunk-dashboard-head{display:flex;align-items:flex-start;justify-content:space-between;gap:30px;margin-bottom:22px}
.six-chunk-dashboard-head h2{margin:7px 0 7px;font-size:clamp(1.5rem,2.5vw,2.25rem);letter-spacing:-.045em}
.six-chunk-dashboard-head p{margin:0;max-width:68ch;color:var(--v3-muted);line-height:1.55}
.chunk-overall-score{
  flex:0 0 auto;display:grid;place-items:center;width:110px;height:110px;border-radius:50%;
  background:conic-gradient(var(--chunk-cyan) calc(var(--chunk-score,0)*1%),rgba(255,255,255,.07) 0);
  box-shadow:inset 0 0 0 9px rgba(8,9,13,.94),0 14px 36px rgba(0,0,0,.28);
  position:relative;
}
.chunk-overall-score::before{content:"";position:absolute;inset:9px;border-radius:50%;background:linear-gradient(145deg,#191b23,#0b0c11);border:1px solid rgba(255,255,255,.08)}
.chunk-overall-score b,.chunk-overall-score small{position:relative;z-index:1}
.chunk-overall-score b{font-size:1.65rem;letter-spacing:-.05em}
.chunk-overall-score small{font-size:.6rem;color:#888893;text-transform:uppercase;letter-spacing:.08em}
.chunk-mastery-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px}
.chunk-mastery-card{
  --mastery-accent:var(--chunk-blue);
  display:grid;grid-template-columns:34px minmax(0,1fr) auto;align-items:center;gap:12px;
  width:100%;padding:14px 15px;border-radius:17px;border:1px solid rgba(255,255,255,.075);
  background:rgba(255,255,255,.035);color:var(--v3-text);text-align:left;
  transition:transform .2s ease,background .2s ease,border-color .2s ease,box-shadow .2s ease;
}
.chunk-mastery-card[data-accent="cyan"]{--mastery-accent:var(--chunk-cyan)}
.chunk-mastery-card[data-accent="green"]{--mastery-accent:var(--chunk-green)}
.chunk-mastery-card[data-accent="purple"]{--mastery-accent:var(--chunk-purple)}
.chunk-mastery-card[data-accent="blue"]{--mastery-accent:var(--chunk-blue)}
.chunk-mastery-card[data-accent="orange"]{--mastery-accent:var(--chunk-orange)}
.chunk-mastery-card[data-accent="red"]{--mastery-accent:var(--chunk-red)}
.chunk-mastery-card:hover{transform:translateY(-2px);background:rgba(255,255,255,.055);border-color:color-mix(in srgb,var(--mastery-accent) 35%,rgba(255,255,255,.09));box-shadow:0 16px 30px rgba(0,0,0,.18)}
.chunk-mastery-order{display:grid;place-items:center;width:34px;height:34px;border-radius:11px;background:color-mix(in srgb,var(--mastery-accent) 14%,rgba(255,255,255,.035));color:var(--mastery-accent);font-weight:800;border:1px solid color-mix(in srgb,var(--mastery-accent) 28%,transparent)}
.chunk-mastery-card>div{min-width:0;display:grid;gap:5px}
.chunk-mastery-card strong{font-size:.86rem;letter-spacing:-.015em}
.chunk-mastery-card small{font-size:.6rem;color:#777781;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.chunk-mastery-card i{display:block;height:4px;border-radius:999px;background:rgba(255,255,255,.08);overflow:hidden}
.chunk-mastery-card i b{display:block;height:100%;border-radius:inherit;background:linear-gradient(90deg,color-mix(in srgb,var(--mastery-accent) 72%,white),var(--mastery-accent));box-shadow:0 0 12px color-mix(in srgb,var(--mastery-accent) 28%,transparent)}
.chunk-mastery-card em{font-style:normal;font-size:.74rem;font-weight:750;color:var(--mastery-accent)}

/* Viewer: seven-item progressive-disclosure navigator */
.guided-chunks{
  --guided-bottom:12px;
  bottom:var(--guided-bottom);
  min-height:44px;
  padding:5px 6px;
  gap:4px;
  background:rgba(9,10,14,.78);
  border-color:rgba(255,255,255,.105);
  box-shadow:0 16px 46px rgba(0,0,0,.42),inset 0 1px rgba(255,255,255,.045);
}
.chunk-nav-button{
  --chunk-nav-accent:var(--chunk-blue);
  display:inline-flex!important;align-items:center;gap:7px!important;
  min-height:34px!important;padding:0 10px!important;border-radius:999px!important;
  color:#81818c!important;transition:background .2s ease,color .2s ease,box-shadow .2s ease,transform .2s ease!important;
}
.chunk-nav-button[data-chunk="anchor"]{--chunk-nav-accent:var(--chunk-cyan)}
.chunk-nav-button[data-chunk="discriminator"]{--chunk-nav-accent:var(--chunk-green)}
.chunk-nav-button[data-chunk="pathway"]{--chunk-nav-accent:var(--chunk-purple)}
.chunk-nav-button[data-chunk="investigations"]{--chunk-nav-accent:var(--chunk-blue)}
.chunk-nav-button[data-chunk="management"]{--chunk-nav-accent:var(--chunk-orange)}
.chunk-nav-button[data-chunk="traps"]{--chunk-nav-accent:var(--chunk-red)}
.chunk-nav-button:hover{color:#ededf2!important;background:rgba(255,255,255,.065)!important}
.chunk-nav-button.active{
  color:#fff!important;
  background:color-mix(in srgb,var(--chunk-nav-accent) 17%,rgba(255,255,255,.045))!important;
  box-shadow:inset 0 0 0 1px color-mix(in srgb,var(--chunk-nav-accent) 34%,transparent),0 8px 24px color-mix(in srgb,var(--chunk-nav-accent) 12%,transparent)!important;
}
.chunk-nav-button .chunk-index{
  display:grid;place-items:center;min-width:22px;height:22px;padding:0 5px;border-radius:8px;
  background:rgba(255,255,255,.06);color:#a8a8b2;font-size:.61rem;font-weight:820;
  border:1px solid rgba(255,255,255,.06);
}
.chunk-nav-button.active .chunk-index{background:var(--chunk-nav-accent);color:#061018;border-color:transparent;box-shadow:0 0 16px color-mix(in srgb,var(--chunk-nav-accent) 30%,transparent)}
.chunk-nav-button.overview{--chunk-nav-accent:var(--chunk-cyan);padding-right:12px!important}
.chunk-nav-button.overview b{font-size:.58rem;color:#8a8a94;font-weight:750}
.chunk-nav-button.overview.active b{color:#d9f7ff}
.chunk-state-dot{
  width:7px;height:7px;border-radius:50%;display:inline-block;background:rgba(255,255,255,.13);
  box-shadow:0 0 0 2px rgba(255,255,255,.025);flex:0 0 auto;
}
.chunk-state-dot[data-state="due"]{background:var(--chunk-orange);box-shadow:0 0 10px rgba(255,159,10,.45)}
.chunk-state-dot[data-state="fragile"]{background:var(--chunk-red);box-shadow:0 0 10px rgba(255,69,58,.4)}
.chunk-state-dot[data-state="learning"]{background:var(--chunk-purple)}
.chunk-state-dot[data-state="secure"]{background:var(--chunk-green)}
.chunk-state-dot[data-state="mastered"]{background:var(--chunk-cyan);box-shadow:0 0 10px rgba(100,210,255,.45)}

/* The selected geometric region follows the image through zoom and rotation. */
.chunk-focus-region{
  position:absolute;z-index:5;pointer-events:none;border-radius:12px;
  --region-accent:var(--chunk-blue);
  border:2px solid color-mix(in srgb,var(--region-accent) 76%,white);
  background:linear-gradient(135deg,color-mix(in srgb,var(--region-accent) 9%,transparent),transparent 45%);
  box-shadow:0 0 0 1px rgba(0,0,0,.38),0 0 24px color-mix(in srgb,var(--region-accent) 35%,transparent),inset 0 0 25px color-mix(in srgb,var(--region-accent) 7%,transparent);
  opacity:0;transform:scale(.98);transition:opacity .28s ease,transform .34s cubic-bezier(.2,.8,.2,1);
}
.chunk-focus-region[data-accent="cyan"]{--region-accent:var(--chunk-cyan)}
.chunk-focus-region[data-accent="green"]{--region-accent:var(--chunk-green)}
.chunk-focus-region[data-accent="purple"]{--region-accent:var(--chunk-purple)}
.chunk-focus-region[data-accent="blue"]{--region-accent:var(--chunk-blue)}
.chunk-focus-region[data-accent="orange"]{--region-accent:var(--chunk-orange)}
.chunk-focus-region[data-accent="red"]{--region-accent:var(--chunk-red)}
.viewer.chunk-revealed .chunk-focus-region:not([hidden]){opacity:1;transform:scale(1)}

/* Retrieval curtain for a single reasoning chunk */
.viewer.chunk-study-active{--active-chunk-accent:var(--chunk-blue)}
.viewer[data-active-chunk="anchor"]{--active-chunk-accent:var(--chunk-cyan)}
.viewer[data-active-chunk="discriminator"]{--active-chunk-accent:var(--chunk-green)}
.viewer[data-active-chunk="pathway"]{--active-chunk-accent:var(--chunk-purple)}
.viewer[data-active-chunk="investigations"]{--active-chunk-accent:var(--chunk-blue)}
.viewer[data-active-chunk="management"]{--active-chunk-accent:var(--chunk-orange)}
.viewer[data-active-chunk="traps"]{--active-chunk-accent:var(--chunk-red)}
.viewer.chunk-recall-active #viewer-transform-space{
  filter:blur(12px) brightness(.28) saturate(.65);
  opacity:.48;
  transform-origin:center;
  transition:filter .35s ease,opacity .35s ease;
}
.viewer.chunk-revealed #viewer-transform-space{filter:none;opacity:1;transition:filter .32s ease,opacity .32s ease}
.viewer.chunk-recall-active .viewer-footer{opacity:.18;pointer-events:none}
.viewer.chunk-study-active .viewer-toolbar{opacity:.38;pointer-events:none}
.viewer.chunk-study-active .viewer-floating-dock,.viewer.chunk-study-active .viewer-fit-fab{display:none!important}

.chunk-study-panel{
  position:absolute;z-index:52;top:50%;width:min(370px,29vw);max-height:calc(100% - 132px);
  padding:20px;border-radius:24px;border:1px solid color-mix(in srgb,var(--active-chunk-accent) 28%,rgba(255,255,255,.1));
  background:linear-gradient(160deg,rgba(28,29,38,.94),rgba(11,12,17,.96));
  box-shadow:0 30px 90px rgba(0,0,0,.52),0 0 0 1px rgba(0,0,0,.35),inset 0 1px rgba(255,255,255,.075);
  backdrop-filter:blur(32px) saturate(150%);-webkit-backdrop-filter:blur(32px) saturate(150%);
  overflow:auto;overscroll-behavior:contain;
  transition:opacity .28s ease,transform .36s cubic-bezier(.2,.8,.2,1),left .3s ease,right .3s ease;
}
.viewer[data-chunk-dock="right"] .chunk-study-panel{right:22px;left:auto;transform:translateY(-50%)}
.viewer[data-chunk-dock="left"] .chunk-study-panel{left:22px;right:auto;transform:translateY(-50%)}
.viewer.chunk-recall-active .chunk-study-panel{
  left:50%!important;right:auto!important;top:50%;width:min(620px,calc(100% - 40px));max-height:calc(100% - 124px);
  transform:translate(-50%,-50%)!important;text-align:center;padding:clamp(23px,3.2vw,38px);
}
.chunk-study-panel::before{
  content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;
  background:radial-gradient(420px 240px at 50% 0%,color-mix(in srgb,var(--active-chunk-accent) 13%,transparent),transparent 72%);
}
.chunk-study-panel>*{position:relative;z-index:1}
.chunk-panel-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;text-align:left}
.chunk-panel-head>div{display:grid;gap:5px}
.chunk-panel-head strong{font-size:1.15rem;letter-spacing:-.03em}
.chunk-step{font-size:.62rem;font-weight:780;letter-spacing:.095em;text-transform:uppercase;color:var(--active-chunk-accent)}
.chunk-panel-head .icon-button{width:36px;height:36px;flex:0 0 auto}
.chunk-prompt{font-size:clamp(1.18rem,2.25vw,1.78rem);line-height:1.34;font-weight:670;letter-spacing:-.035em;color:#f5f5f7;margin:24px auto 18px;max-width:29ch}
.chunk-hint-button{
  min-height:38px;padding:0 13px;border-radius:999px;border:1px solid rgba(255,255,255,.09);
  display:inline-flex;align-items:center;gap:8px;background:rgba(255,255,255,.045);color:#b9b9c2;font-size:.72rem;font-weight:650;
}
.chunk-hint-button svg{width:16px;height:16px;color:var(--active-chunk-accent)}
.chunk-hint{margin:12px auto 0;padding:12px 14px;border-radius:14px;max-width:48ch;background:color-mix(in srgb,var(--active-chunk-accent) 8%,rgba(255,255,255,.03));border:1px solid color-mix(in srgb,var(--active-chunk-accent) 19%,transparent);font-size:.78rem;line-height:1.5;color:#c6c6cf}
.chunk-reveal-button{width:min(350px,100%);margin:20px auto 10px;justify-content:center;background:linear-gradient(135deg,var(--active-chunk-accent),color-mix(in srgb,var(--active-chunk-accent) 66%,#5e5ce6));box-shadow:0 15px 38px color-mix(in srgb,var(--active-chunk-accent) 24%,transparent)}
.chunk-study-panel>small{display:block;color:#6f6f79;font-size:.62rem;line-height:1.45}
.chunk-revealed-label{
  display:flex;align-items:center;flex-wrap:wrap;gap:7px;margin:18px 0 0;padding:10px 11px;border-radius:13px;
  background:rgba(255,255,255,.035);border:1px solid rgba(255,255,255,.07);color:#d8d8de;font-size:.71rem;font-weight:670;
}
.chunk-revealed-label small{margin-left:auto;color:#777781;font-size:.59rem;font-weight:570}
.chunk-rate-copy{margin:18px 0 12px;color:#b8b8c1;font-size:.82rem;line-height:1.45}
.chunk-rating-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:7px}
.chunk-rating-button{
  min-height:56px;border-radius:14px;border:1px solid rgba(255,255,255,.08);background:rgba(255,255,255,.035);color:#b8b8c1;
  display:grid;place-items:center;gap:3px;font-size:.65rem;font-weight:700;transition:transform .18s ease,background .18s ease,border-color .18s ease,color .18s ease;
}
.chunk-rating-button span{font-size:1rem;line-height:1}
.chunk-rating-button:hover{transform:translateY(-2px);background:rgba(255,255,255,.07);color:#fff}
.chunk-rating-button[data-chunk-rating="again"]:hover,.chunk-rating-button[data-chunk-rating="again"].active{border-color:rgba(255,69,58,.46);background:rgba(255,69,58,.1);color:#ff8b84}
.chunk-rating-button[data-chunk-rating="hard"]:hover,.chunk-rating-button[data-chunk-rating="hard"].active{border-color:rgba(255,159,10,.46);background:rgba(255,159,10,.1);color:#ffc45e}
.chunk-rating-button[data-chunk-rating="good"]:hover,.chunk-rating-button[data-chunk-rating="good"].active{border-color:rgba(48,209,88,.46);background:rgba(48,209,88,.1);color:#75e892}
.chunk-rating-button[data-chunk-rating="easy"]:hover,.chunk-rating-button[data-chunk-rating="easy"].active{border-color:rgba(100,210,255,.46);background:rgba(100,210,255,.1);color:#a9ebff}
.chunk-panel-foot{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:15px;padding-top:13px;border-top:1px solid rgba(255,255,255,.07)}
.chunk-panel-foot>span{font-size:.61rem;color:#777781;line-height:1.35}
.chunk-panel-foot .text-button{display:inline-flex;align-items:center;gap:5px;white-space:nowrap;font-size:.68rem}
.chunk-panel-foot .text-button svg{width:15px;height:15px}

/* First transition into chunk mode feels deliberate rather than modal-heavy. */
@keyframes chunkPanelIn{
  from{opacity:0;transform:translateY(-47%) scale(.97)}
  to{opacity:1;transform:translateY(-50%) scale(1)}
}
.viewer[data-chunk-dock="left"] .chunk-study-panel:not([hidden]),
.viewer[data-chunk-dock="right"] .chunk-study-panel:not([hidden]){animation:chunkPanelIn .32s cubic-bezier(.2,.8,.2,1)}
.viewer.chunk-recall-active .chunk-study-panel:not([hidden]){animation:none}

/* Compact/phone behaviour: the content remains the hero. */
@media(max-width:900px){
  .six-chunk-dashboard-head{gap:18px}
  .chunk-mastery-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .chunk-overall-score{width:94px;height:94px}
  .chunk-study-panel,
  .viewer[data-chunk-dock="left"] .chunk-study-panel,
  .viewer[data-chunk-dock="right"] .chunk-study-panel{
    top:auto;left:10px!important;right:10px!important;bottom:58px;width:auto;max-height:min(43%,370px);transform:none!important;
    border-radius:22px;padding:16px;
  }
  .viewer.chunk-recall-active .chunk-study-panel{
    top:50%;left:10px!important;right:10px!important;bottom:auto;width:auto;max-height:calc(100% - 112px);transform:translateY(-50%)!important;
  }
  .chunk-prompt{font-size:clamp(1.08rem,4.7vw,1.45rem);margin:17px auto 14px}
  .chunk-reveal-button{margin-top:15px}
  .guided-chunks{bottom:7px;left:7px;right:7px;transform:none;max-width:none;border-radius:17px;padding:4px;justify-content:flex-start}
  .chunk-nav-button{padding:0 8px!important;gap:5px!important}
  .chunk-nav-button>span:nth-child(2){font-size:.59rem}
  .chunk-nav-button .chunk-index{min-width:20px;height:20px;border-radius:7px}
  .chunk-nav-button.overview b{display:none}
  .viewer.chunk-study-active .guided-chunks{opacity:.96}
}

@media(max-width:600px){
  .topic-chunk-progress{padding:9px 10px}
  .six-chunk-dashboard{padding:19px 15px;border-radius:24px}
  .six-chunk-dashboard-head{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center}
  .six-chunk-dashboard-head h2{font-size:1.45rem}
  .six-chunk-dashboard-head p{grid-column:1/-1;font-size:.83rem}
  .chunk-overall-score{width:76px;height:76px;box-shadow:inset 0 0 0 7px rgba(8,9,13,.94)}
  .chunk-overall-score::before{inset:7px}
  .chunk-overall-score b{font-size:1.25rem}.chunk-overall-score small{font-size:.5rem}
  .chunk-mastery-grid{grid-template-columns:1fr;gap:7px}
  .chunk-mastery-card{padding:12px;grid-template-columns:32px minmax(0,1fr) auto}
  .chunk-mastery-order{width:32px;height:32px}
  .chunk-rating-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .chunk-rating-button{min-height:48px}
  .guided-chunks{overflow-x:auto;scroll-snap-type:x proximity}
  .chunk-nav-button{scroll-snap-align:center;flex:0 0 auto}
  .chunk-nav-button>span:nth-child(2){display:none}
  .chunk-nav-button.overview>span:nth-child(2){display:block}
  .chunk-nav-button{min-width:42px!important;justify-content:center}
  .chunk-nav-button.overview{min-width:92px!important}
}

@media(max-height:580px) and (orientation:landscape){
  .viewer.chunk-study-active .viewer-header{opacity:.18;pointer-events:none}
  .viewer.chunk-study-active .guided-chunks{left:50%;right:auto;bottom:max(5px,env(safe-area-inset-bottom));transform:translateX(-50%);max-width:70%;border-radius:15px}
  .viewer[data-chunk-dock="left"] .chunk-study-panel,
  .viewer[data-chunk-dock="right"] .chunk-study-panel{
    top:50%;bottom:auto;width:min(320px,35vw);max-height:calc(100% - 20px);transform:translateY(-50%)!important;padding:14px;
  }
  .viewer[data-chunk-dock="left"] .chunk-study-panel{left:max(8px,env(safe-area-inset-left))!important;right:auto!important}
  .viewer[data-chunk-dock="right"] .chunk-study-panel{right:max(8px,env(safe-area-inset-right))!important;left:auto!important}
  .viewer.chunk-recall-active .chunk-study-panel{left:50%!important;right:auto!important;width:min(660px,80vw);max-height:calc(100% - 16px);transform:translate(-50%,-50%)!important;display:grid;grid-template-columns:minmax(0,1fr) minmax(220px,34%);column-gap:18px;text-align:left}
  .viewer.chunk-recall-active .chunk-panel-head,.viewer.chunk-recall-active .chunk-prompt,.viewer.chunk-recall-active .chunk-hint{grid-column:1}
  .viewer.chunk-recall-active .chunk-hint-button,.viewer.chunk-recall-active .chunk-reveal-button,.viewer.chunk-recall-active .chunk-study-panel>small{grid-column:2}
  .viewer.chunk-recall-active .chunk-panel-head{align-self:start}
  .viewer.chunk-recall-active .chunk-prompt{align-self:center;margin:10px 0;font-size:clamp(1rem,3.3vh,1.35rem);max-width:34ch}
  .viewer.chunk-recall-active .chunk-hint-button{align-self:end;justify-self:stretch;justify-content:center}
  .viewer.chunk-recall-active .chunk-reveal-button{align-self:center;margin:8px 0;width:100%}
  .viewer.chunk-recall-active .chunk-study-panel>small{align-self:start;text-align:center}
  .chunk-panel-head strong{font-size:1rem}.chunk-rate-copy{margin:11px 0 8px;font-size:.72rem}
  .chunk-rating-button{min-height:44px}.chunk-panel-foot{margin-top:10px;padding-top:9px}
}

@media(prefers-reduced-motion:reduce){
  .chunk-focus-region,.chunk-study-panel,.chunk-nav-button,.chunk-mastery-card,.topic-chunk-progress>span i{transition:none!important;animation:none!important}
}
.chunk-rating-button:disabled{cursor:default;opacity:.56;transform:none!important}
.chunk-rating-button.active:disabled{opacity:1;box-shadow:0 0 0 1px currentColor inset}

/* V4.8 compact-landscape hardening — chunk retrieval must own the viewport.
   The header becomes a light overlay and the ordinary toolbar no longer steals
   vertical space. The close control remains available while the visual and
   recall coach use the full safe height. */
@media(max-height:580px) and (orientation:landscape){
  .viewer.chunk-study-active{
    position:absolute!important;inset:0!important;display:block!important;overflow:hidden!important;
  }
  .viewer.chunk-study-active>.viewer-toolbar,
  .viewer.chunk-study-active>.viewer-footer{display:none!important}
  .viewer.chunk-study-active>.viewer-header{
    position:absolute!important;z-index:90;top:0;left:0;right:0;height:46px;min-height:46px;
    padding:4px max(8px,env(safe-area-inset-right)) 4px max(8px,env(safe-area-inset-left));
    background:linear-gradient(180deg,rgba(2,3,6,.66),rgba(2,3,6,0));border:0;opacity:1;pointer-events:none;
  }
  .viewer.chunk-study-active>.viewer-header .viewer-exit-button{pointer-events:auto;opacity:.84;transform:scale(.9)}
  .viewer.chunk-study-active>.viewer-header .viewer-title,
  .viewer.chunk-study-active>.viewer-header .viewer-session-progress,
  .viewer.chunk-study-active>.viewer-header .viewer-header-actions{display:none!important}
  .viewer.chunk-study-active>.viewer-stage{
    position:absolute!important;z-index:1;inset:0!important;width:100%!important;height:100%!important;
    min-height:100%!important;max-height:none!important;padding:0!important;
  }
  .viewer.chunk-study-active .chunk-study-panel{
    max-height:calc(100% - 54px)!important;
  }
  .viewer.chunk-recall-active .chunk-study-panel{
    top:calc(50% - 3px)!important;
  }
  .viewer.chunk-study-active .guided-chunks{
    z-index:88;max-width:min(78%,680px);
  }
}

/* V4.8.1 compact-landscape geometry correction.
   Earlier landscape rules reserve a header offset; once chunk study owns the
   viewport that offset must not be combined with translateY(-50%), otherwise
   the revealed rating card can drift above the iPhone safe area. */
@media(max-height:580px) and (orientation:landscape){
  .viewer.landscape-study.chunk-study-active:not(.chunk-recall-active)[data-chunk-dock="left"] .chunk-study-panel,
  .viewer.landscape-study.chunk-study-active:not(.chunk-recall-active)[data-chunk-dock="right"] .chunk-study-panel{
    top:50%!important;
    bottom:auto!important;
    max-height:calc(100% - 32px)!important;
    transform:translateY(-50%)!important;
  }
  .viewer.landscape-study.chunk-recall-active .chunk-study-panel{
    top:50%!important;
    bottom:auto!important;
    max-height:calc(100% - 24px)!important;
  }
}

/* ========================================================================== 
   V4.9 — PHASE 2A: VISUAL CLOZE + MEASURED MICRO-CHECKS
   The slide remains visible. One reasoning region is taped, retrieved, then
   verified through an authored question or a universal three-point rubric.
   ========================================================================== */

/* Resilient secure delivery: a protected low-resolution preview remains usable
   while the private signed-render backend is being configured or retried. */
.viewer-canvas-wrap.preview-fallback .slide-placeholder{
  opacity:1!important;filter:none!important;transform:none!important;object-fit:contain;
}
.viewer.preview-fallback-active .viewer-license-chip{
  background:rgba(9,20,28,.84);border-color:rgba(100,210,255,.22);color:#ccefff;
}
.secure-slide-loader.preview-notice{
  inset:auto 12px 12px 12px;min-height:0;max-width:min(560px,calc(100% - 24px));
  margin:0 auto;padding:11px 13px;gap:10px;justify-content:flex-start;border:1px solid rgba(100,210,255,.2);
  border-radius:16px;background:rgba(6,12,18,.88);box-shadow:0 16px 50px rgba(0,0,0,.42);
  backdrop-filter:blur(22px);-webkit-backdrop-filter:blur(22px);text-align:left;
}
.secure-slide-loader.preview-notice>div{max-width:none;grid-template-columns:minmax(0,1fr) auto;align-items:center;column-gap:12px}
.secure-slide-loader.preview-notice b,.secure-slide-loader.preview-notice small{grid-column:1}
.secure-slide-loader.preview-notice .button{grid-column:2;grid-row:1/3;margin:0;white-space:nowrap}
.secure-slide-loader.preview-notice .secure-loader-error-icon{font-size:20px;color:var(--chunk-cyan)}

/* Visual Tape lives in the same transformed scene as the slide, so the mask
   follows every fit, rotation, pinch zoom and pan operation exactly. */
.visual-cloze-tape{
  --tape-accent:var(--chunk-blue);position:absolute;z-index:4;display:flex;flex-direction:column;align-items:center;
  justify-content:center;gap:5px;padding:10px;border:2px solid color-mix(in srgb,var(--tape-accent) 68%,white);
  border-radius:14px;color:#f7fbff;text-align:center;background:
    linear-gradient(135deg,rgba(16,19,28,.985),rgba(5,8,14,.975)),
    repeating-linear-gradient(135deg,transparent 0 12px,rgba(255,255,255,.03) 12px 14px);
  box-shadow:0 18px 55px rgba(0,0,0,.62),0 0 0 1px rgba(0,0,0,.5),0 0 32px color-mix(in srgb,var(--tape-accent) 22%,transparent);
  overflow:hidden;cursor:pointer;touch-action:manipulation;-webkit-tap-highlight-color:transparent;
  animation:tape-in .25s cubic-bezier(.2,.8,.2,1);
}
.visual-cloze-tape::before{
  content:"";position:absolute;inset:0;background:repeating-linear-gradient(120deg,transparent 0 24px,rgba(255,255,255,.026) 24px 26px);pointer-events:none;
}
.visual-cloze-tape[hidden]{display:none!important}
.visual-cloze-tape[data-accent="cyan"]{--tape-accent:var(--chunk-cyan)}
.visual-cloze-tape[data-accent="green"]{--tape-accent:var(--chunk-green)}
.visual-cloze-tape[data-accent="purple"]{--tape-accent:var(--chunk-purple)}
.visual-cloze-tape[data-accent="blue"]{--tape-accent:var(--chunk-blue)}
.visual-cloze-tape[data-accent="orange"]{--tape-accent:var(--chunk-orange)}
.visual-cloze-tape[data-accent="red"]{--tape-accent:var(--chunk-red)}
.visual-cloze-tape span{width:30px;height:30px;display:grid;place-items:center;border-radius:10px;background:color-mix(in srgb,var(--tape-accent) 14%,transparent);color:var(--tape-accent)}
.visual-cloze-tape span svg{width:18px;height:18px}.visual-cloze-tape b{position:relative;font-size:.76rem;letter-spacing:-.01em}.visual-cloze-tape small{position:relative;color:#8e9aa5;font-size:.54rem}
@keyframes tape-in{from{opacity:0;transform:scale(.975)}to{opacity:1;transform:scale(1)}}
.viewer.visual-cloze-active #viewer-transform-space{filter:none!important;opacity:1!important;pointer-events:auto!important}
.viewer.visual-cloze-active .chunk-focus-region{opacity:0!important}

.chunk-mode-switch{
  display:grid;grid-template-columns:1fr 1fr;gap:5px;padding:4px;margin:0 0 13px;border:1px solid rgba(255,255,255,.08);
  border-radius:14px;background:rgba(255,255,255,.028);
}
.chunk-mode-switch button{
  min-height:36px;display:flex;align-items:center;justify-content:center;gap:7px;border:0;border-radius:10px;
  background:transparent;color:#777782;font-size:.62rem;font-weight:720;transition:.18s ease;
}
.chunk-mode-switch button svg{width:15px;height:15px}.chunk-mode-switch button.active{background:color-mix(in srgb,var(--chunk-accent) 14%,rgba(255,255,255,.04));color:#f4fbff;box-shadow:0 5px 18px rgba(0,0,0,.22)}

.phase2-assessment{
  display:grid;gap:11px;margin-top:2px;padding:13px;border:1px solid rgba(255,255,255,.085);border-radius:16px;
  background:rgba(255,255,255,.03);
}
.phase2-assessment-head{display:flex;align-items:center;justify-content:space-between;gap:12px}
.phase2-assessment-head span{color:var(--chunk-accent);font-size:.58rem;font-weight:780;text-transform:uppercase;letter-spacing:.08em}
.phase2-assessment-head b{padding:4px 7px;border-radius:8px;background:rgba(255,255,255,.055);color:#9e9eaa;font-size:.55rem}
.phase2-assessment>p{margin:0;color:#d9d9df;font-size:.72rem;line-height:1.46}
.phase2-options,.phase2-criteria{display:grid;gap:6px}
.phase2-options button,.phase2-criteria button{
  min-height:42px;display:flex;align-items:center;gap:9px;padding:8px 10px;border:1px solid rgba(255,255,255,.075);
  border-radius:11px;background:rgba(255,255,255,.025);color:#a7a7b0;text-align:left;font-size:.61rem;line-height:1.35;transition:.16s ease;
}
.phase2-options button:hover,.phase2-criteria button:hover,.phase2-options button:focus-visible,.phase2-criteria button:focus-visible{background:rgba(255,255,255,.06);color:#f2f2f5}
.phase2-options button.selected,.phase2-criteria button.selected{border-color:color-mix(in srgb,var(--chunk-accent) 42%,transparent);background:color-mix(in srgb,var(--chunk-accent) 11%,transparent);color:#fff}
.phase2-options button>span{width:23px;height:23px;display:grid;place-items:center;flex:0 0 auto;border:1px solid rgba(255,255,255,.12);border-radius:7px;color:#85858e;font-size:.56rem;font-weight:800}
.phase2-options button.selected>span{border-color:transparent;background:var(--chunk-accent);color:#061018}
.phase2-criteria button>svg{width:18px;height:18px;flex:0 0 auto;padding:3px;border-radius:6px;background:var(--chunk-accent);color:#061018}
.phase2-check-button{min-height:42px;justify-content:center}.phase2-check-button:disabled{opacity:.38;cursor:not-allowed}

.phase2-result{
  display:grid;gap:7px;margin:2px 0 12px;padding:13px;border:1px solid rgba(255,255,255,.09);border-radius:16px;
  background:linear-gradient(145deg,rgba(255,255,255,.04),rgba(255,255,255,.018));
}
.phase2-result.correct{border-color:rgba(48,209,88,.25);background:linear-gradient(145deg,rgba(48,209,88,.09),rgba(255,255,255,.02))}
.phase2-result.incorrect{border-color:rgba(255,69,58,.25);background:linear-gradient(145deg,rgba(255,69,58,.085),rgba(255,255,255,.02))}
.phase2-result.partial{border-color:rgba(255,159,10,.24);background:linear-gradient(145deg,rgba(255,159,10,.075),rgba(255,255,255,.02))}
.phase2-kicker{color:var(--chunk-accent);font-size:.55rem;font-weight:780;text-transform:uppercase;letter-spacing:.08em}.phase2-result>strong{color:#f5f6f8;font-size:1.05rem}.phase2-result>p{margin:0;color:#a9a9b2;font-size:.66rem;line-height:1.45}.phase2-result>div{display:flex;align-items:center;justify-content:space-between;padding-top:9px;border-top:1px solid rgba(255,255,255,.07)}.phase2-result>div span{color:#74747e;font-size:.56rem}.phase2-result>div b{color:#e9f7ff;font-size:.64rem}
.chunk-rating-button.recommended{border-color:color-mix(in srgb,var(--chunk-accent) 45%,transparent);box-shadow:0 0 0 1px color-mix(in srgb,var(--chunk-accent) 10%,transparent),0 0 24px color-mix(in srgb,var(--chunk-accent) 10%,transparent)}
.chunk-rating-button small{display:block;color:var(--chunk-accent);font-size:.43rem;line-height:1;text-transform:uppercase;letter-spacing:.04em}

@media(max-width:680px){
  .secure-slide-loader.preview-notice{left:8px;right:8px;bottom:52px;max-width:none;padding:9px 10px}
  .secure-slide-loader.preview-notice>div{grid-template-columns:1fr}.secure-slide-loader.preview-notice .button{grid-column:1;grid-row:auto;justify-self:start;margin-top:3px}
  .visual-cloze-tape b{font-size:.65rem}.visual-cloze-tape small{display:none}.visual-cloze-tape span{width:26px;height:26px}
  .phase2-options button,.phase2-criteria button{min-height:40px;font-size:.59rem}.phase2-assessment{padding:11px}
}
@media(orientation:landscape) and (pointer:coarse){
  .viewer.landscape-study .secure-slide-loader.preview-notice{bottom:max(7px,env(safe-area-inset-bottom));left:50%;right:auto;transform:translateX(-50%);width:min(620px,72vw)}
  .viewer.landscape-study .phase2-assessment{gap:7px;padding:9px}.viewer.landscape-study .phase2-assessment>p{font-size:.61rem}.viewer.landscape-study .phase2-options{grid-template-columns:1fr 1fr}.viewer.landscape-study .phase2-options button,.viewer.landscape-study .phase2-criteria button{min-height:34px;padding:6px 8px;font-size:.54rem}.viewer.landscape-study .phase2-result{padding:9px;gap:5px}.viewer.landscape-study .phase2-result>p{font-size:.57rem}
}
@media(prefers-reduced-motion:reduce){.visual-cloze-tape,.chunk-mode-switch button,.phase2-options button,.phase2-criteria button{animation:none!important;transition:none!important}}

/* V4.9 visibility guarantee: the protected preview is the immediate visual,
   never a blank stage. The full licensed render cross-fades over it when ready. */
.viewer-canvas-wrap:not(.image-ready) .slide-placeholder{
  opacity:1!important;filter:saturate(.92) contrast(.96)!important;transform:none!important;
}
.secure-slide-loader:not(.ready){
  inset:auto 12px 12px 12px;min-height:0;max-width:min(560px,calc(100% - 24px));margin:0 auto;
  padding:10px 13px;justify-content:flex-start;border:1px solid rgba(100,210,255,.17);border-radius:16px;
  background:rgba(5,11,17,.82);box-shadow:0 14px 44px rgba(0,0,0,.38);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
}
.secure-slide-loader:not(.ready)>div{max-width:none}.secure-slide-loader:not(.ready) b{font-size:.75rem}.secure-slide-loader:not(.ready) small{font-size:.58rem}.secure-slide-loader:not(.ready) .secure-loader-orb{width:22px;height:22px;flex-basis:22px}

/* V4.9 Phase 2 mobile completion: keep the objective check and rating controls
   in one comfortably scrollable sheet without swallowing the entire visual. */
@media(max-width:680px) and (orientation:portrait){
  .viewer.chunk-study-active .chunk-study-panel,
  .viewer[data-chunk-dock="left"] .chunk-study-panel,
  .viewer[data-chunk-dock="right"] .chunk-study-panel{
    max-height:min(60vh,520px);
    scrollbar-width:thin;
    scrollbar-color:rgba(100,210,255,.32) transparent;
  }
  .viewer.chunk-study-active .chunk-study-panel::-webkit-scrollbar{width:5px}
  .viewer.chunk-study-active .chunk-study-panel::-webkit-scrollbar-thumb{background:rgba(100,210,255,.28);border-radius:999px}
}

/* V4.9 final mobile visual-first correction.
   In portrait chunk study the slide scene moves into the upper learning zone,
   while the recall/assessment sheet occupies the lower zone. This keeps the
   clinical visual genuinely visible instead of leaving a large empty field. */
@media(max-width:680px) and (orientation:portrait){
  .viewer.chunk-study-active #viewer-transform-space{
    top:27%!important;
    transition:top .28s cubic-bezier(.2,.8,.2,1),filter .32s ease,opacity .32s ease;
  }
  .viewer.chunk-recall-active .chunk-study-panel{
    top:auto!important;bottom:58px!important;transform:none!important;
    max-height:min(48vh,405px)!important;
  }
  .viewer.chunk-revealed .chunk-study-panel{
    max-height:min(56vh,475px)!important;
  }
  .viewer.chunk-study-active .viewer-license-chip{top:8px;bottom:auto}
}

/* V4.9 final landscape control correction. Earlier landscape rules anchored the
   chunk rail beneath the header. Phase 2 uses that space for the assessment
   coach, so the rail now stays in the lower safe area without overlap. */
@media(max-height:580px) and (orientation:landscape){
  .viewer.landscape-study.chunk-study-active .guided-chunks{
    position:absolute!important;
    top:auto!important;
    bottom:max(5px,env(safe-area-inset-bottom))!important;
    left:50%!important;right:auto!important;
    transform:translateX(-50%)!important;
    z-index:88!important;
  }
}