:root{--canvas:#f3efe7;--ink:#17181c;--muted:#5e636f;--surface:rgba(255,255,255,0.8);--surface-strong:#ffffff;--line:rgba(23,24,28,0.12);--accent:#0f766e;--accent-deep:#0a4f4a;--accent-soft:#d6f0ea;--warm:#9a3412;--shadow:0 24px 50px rgba(21,27,38,0.08)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:Georgia,Times New Roman,serif;color:var(--ink);background:radial-gradient(circle at top left,rgba(15,118,110,.14),transparent 28%),radial-gradient(circle at top right,rgba(154,52,18,.12),transparent 24%),linear-gradient(180deg,#fbf7ef 0,var(--canvas) 100%)}a{color:inherit;text-decoration:none}button,input,textarea{font:inherit}input:not([type=range]),select{width:100%;border-radius:14px;border:1px solid var(--line);padding:12px 14px;background:rgba(255,255,255,.92)}.app-shell{min-height:100vh;padding:24px;display:grid;gap:24px;grid-template-rows:auto 1fr auto}.skip-link{position:absolute;left:24px;top:-48px;padding:10px 14px;border-radius:999px;background:var(--surface-strong);border:1px solid var(--line);z-index:20}.skip-link:focus{top:16px}.site-header{display:flex;justify-content:space-between;align-items:flex-start;gap:24px;padding:20px 0 28px}.brand-mark{font-size:1.6rem;font-weight:700;letter-spacing:-.03em}.brand-subtitle{margin:4px 0 0;max-width:560px;color:var(--muted)}.site-nav{display:flex;gap:16px;flex-wrap:wrap}.site-nav a{padding:10px 14px;border:1px solid var(--line);border-radius:999px;background:rgba(255,255,255,.5)}.page-stack{display:grid;gap:24px}.site-footer{border:1px solid var(--line);border-radius:24px;background:linear-gradient(180deg,rgba(255,255,255,.88),rgba(248,242,233,.94));box-shadow:var(--shadow);padding:24px 28px}.site-footer-grid{display:grid;gap:20px;grid-template-columns:repeat(3,minmax(0,1fr))}.footer-panel,.legal-copy{display:grid;gap:14px}.footer-panel h2,.legal-copy h2{margin:0;line-height:1.1;letter-spacing:-.03em}.footer-link-list{display:grid;gap:10px}.footer-link,.footer-link-list a{color:var(--accent-deep)}.hero,.lesson-card,.module-card,.panel,.section-block{border:1px solid var(--line);border-radius:24px;background:var(--surface);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);box-shadow:var(--shadow)}.hero,.section-block{padding:28px}.hero{display:grid;grid-template-columns:1.4fr 1fr;gap:24px}.hero h1,.panel h2,.section-block h1,.section-block h2{margin:0;line-height:1.05;letter-spacing:-.04em}.hero h1{font-size:clamp(2.4rem,5vw,4.4rem);max-width:12ch}.hero-text,.lesson-card p,.panel p,.section-heading p{color:var(--muted)}.hero-copy,.hero-grid,.section-heading,.stack{display:grid;gap:16px}.hero-panel{border-radius:20px;padding:20px;background:linear-gradient(180deg,rgba(15,118,110,.08),rgba(255,255,255,.9));border:1px solid rgba(15,118,110,.14)}.lesson-layout-grid,.module-grid,.two-column-grid{display:grid;gap:20px}.module-grid{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}.lesson-layout-grid,.two-column-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.lesson-card,.module-card,.panel{padding:22px}.goal-list,.source-list{margin:0;padding-left:18px;display:grid;gap:10px}.source-list.compact{gap:12px;padding-left:0;list-style:none}.source-list.compact li{display:grid;gap:4px}.reference-list{margin:0;padding-left:0;list-style:none;display:grid;gap:16px}.breadcrumb-list ol{margin:0;padding:0;list-style:none;display:flex;gap:10px;flex-wrap:wrap;align-items:center}.breadcrumb-list li{display:inline-flex;gap:10px;align-items:center;color:var(--muted);font-size:.94rem}.breadcrumb-list li+li:before{content:"/";color:rgba(23,24,28,.35)}.breadcrumb-list a{color:var(--accent-deep)}.reference-item{display:grid;gap:8px;padding-top:16px;border-top:1px solid rgba(23,24,28,.1)}.reference-item:first-child{padding-top:0;border-top:none}.reference-item p{margin:0;line-height:1.55}.eyebrow,.flashcard-level,.quiz-index,.retrieval-mode,.source-list.compact span{text-transform:uppercase;letter-spacing:.16em;font-size:.73rem;color:var(--warm)}.button-row,.chapter-stamp,.lesson-actions,.module-card-footer,.module-card-header,.panel-header,.prompt-pills{display:flex;gap:12px;flex-wrap:wrap;align-items:center}.module-card-footer,.module-card-header,.panel-header{justify-content:space-between}.primary-button,.prompt-pill,.secondary-button{border-radius:999px;border:none;cursor:pointer;transition:transform .12s ease,background .12s ease}.primary-button{background:var(--accent);color:white;padding:12px 18px}.prompt-pill,.secondary-button{background:var(--surface-strong);color:var(--ink);border:1px solid var(--line);padding:12px 18px}.primary-button:hover,.prompt-pill:hover,.secondary-button:hover{transform:translateY(-1px)}.chapter-list,.choice-list,.dashboard-metrics,.lesson-list{display:grid;gap:16px}.dashboard-metrics{grid-template-columns:repeat(auto-fit,minmax(180px,1fr))}.lesson-card{display:grid;grid-template-columns:1.4fr auto;gap:16px}.lesson-video{width:100%;border-radius:18px;background:#101115}.chapter-card,.citation-card,.flashcard,.metric-card,.note-card,.quiz-card{border-radius:18px;padding:16px;background:rgba(255,255,255,.9);border:1px solid var(--line)}.note-input{width:100%;border-radius:16px;border:1px solid var(--line);padding:14px 16px;background:rgba(255,255,255,.9);resize:vertical;min-height:120px}.muted{color:var(--muted)}.qa-response,.quiz-result{display:grid;gap:14px}.choice-item{display:flex;gap:10px;align-items:flex-start;padding:12px 14px;border-radius:14px;background:rgba(15,118,110,.05);border:1px solid rgba(15,118,110,.12)}.choice-item input{margin-top:3px}.score-pill{padding:10px 14px;border-radius:999px;background:var(--accent-soft);color:var(--accent-deep)}.status-pill{padding:8px 12px;border-radius:999px;border:1px solid var(--line);background:rgba(255,255,255,.9);color:var(--muted);font-size:.78rem}.status-pill.in_progress{background:rgba(15,118,110,.1);color:var(--accent-deep);border-color:rgba(15,118,110,.18)}.status-pill.completed{background:rgba(15,118,110,.18);color:var(--accent-deep);border-color:rgba(15,118,110,.24)}.module-progress{display:grid;gap:10px}.module-progress-track{height:10px;border-radius:999px;background:rgba(23,24,28,.08);overflow:hidden}.module-progress-track span{display:block;height:100%;border-radius:inherit;background:linear-gradient(90deg,var(--accent),#2ea89f)}.analytics-hero,.project-hero{background:radial-gradient(circle at top left,rgba(15,118,110,.12),transparent 32%),linear-gradient(180deg,rgba(255,255,255,.88),rgba(248,242,233,.9))}.about-hero{background:radial-gradient(circle at top right,rgba(15,118,110,.14),transparent 30%),radial-gradient(circle at bottom left,rgba(154,52,18,.14),transparent 24%),linear-gradient(180deg,rgba(255,255,255,.92),rgba(248,242,233,.96))}.about-metric-value{font-size:clamp(1.8rem,3vw,2.8rem);line-height:1;letter-spacing:-.04em;font-feature-settings:"tnum";font-variant-numeric:tabular-nums}.onboarding-banner{background:radial-gradient(circle at top right,rgba(154,52,18,.12),transparent 34%),linear-gradient(180deg,rgba(255,255,255,.94),rgba(246,242,235,.94))}.analytics-band,.analytics-form-grid,.analytics-metric-grid,.insight-grid,.projects-grid,.review-grid{display:grid;gap:16px}.analytics-metric-grid{grid-template-columns:repeat(auto-fit,minmax(180px,1fr))}.insight-grid{grid-template-columns:minmax(0,1.1fr) minmax(320px,.9fr)}.analytics-form-grid{grid-template-columns:repeat(auto-fit,minmax(180px,1fr))}.analytics-form-grid label,.review-grid label{display:grid;gap:8px;color:var(--muted)}.analytics-band{grid-template-columns:repeat(auto-fit,minmax(90px,1fr))}.activity-bar-card{display:grid;gap:10px;justify-items:center;padding:14px 10px;border-radius:18px;background:rgba(255,255,255,.86);border:1px solid var(--line)}.activity-bar-track{display:flex;align-items:flex-end;justify-content:center;width:100%;min-height:112px;border-radius:18px;background:linear-gradient(180deg,rgba(15,118,110,.07),rgba(255,255,255,.9))}.activity-bar-track span{display:block;width:28px;border-radius:999px 999px 10px 10px;background:linear-gradient(180deg,var(--warm),var(--accent))}.insight-card,.path-step-card,.project-submission-card,.skill-gap-card{border-radius:18px;padding:18px;border:1px solid var(--line);background:rgba(255,255,255,.92)}.emphasis-card{background:linear-gradient(180deg,rgba(15,118,110,.12),rgba(255,255,255,.96));border-color:rgba(15,118,110,.24)}.inline-action{display:inline-flex;width:auto}.heatmap-grid{display:grid;grid-template-columns:repeat(18,minmax(0,1fr));gap:8px}.heatmap-cell{aspect-ratio:1;border-radius:8px;border:1px solid rgba(23,24,28,.08);background:rgba(23,24,28,.06)}.heatmap-cell.intensity-1{background:rgba(15,118,110,.18)}.heatmap-cell.intensity-2{background:rgba(15,118,110,.34)}.heatmap-cell.intensity-3{background:rgba(15,118,110,.52)}.heatmap-cell.intensity-4{background:rgba(15,118,110,.74)}.video-panel-grid{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(280px,.85fr);gap:18px}.transcript-panel{display:grid;gap:14px;padding:18px;border-radius:18px;background:rgba(255,255,255,.9);border:1px solid var(--line)}.transcript-list{display:grid;gap:10px;max-height:720px;overflow:auto}.transcript-segment{display:grid;gap:8px;padding:14px;text-align:left;border-radius:16px;border:1px solid var(--line);background:rgba(255,255,255,.92);cursor:pointer}.transcript-segment.is-active{border-color:rgba(15,118,110,.34);background:linear-gradient(180deg,rgba(15,118,110,.1),rgba(255,255,255,.94))}.arena-presence-bar{display:flex;gap:10px;flex-wrap:wrap}.loading-shell{display:grid;gap:18px}.loading-card,.loading-line{border-radius:16px;background:linear-gradient(90deg,rgba(255,255,255,.9),rgba(214,240,234,.8),rgba(255,255,255,.9));background-size:220% 100%;animation:shimmer 1.5s linear infinite}.loading-line{height:18px}.loading-line-wide{width:min(540px,100%)}.loading-line-short{width:min(220px,70%)}.loading-grid{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(180px,1fr))}.loading-card{min-height:160px}@keyframes shimmer{0%{background-position:200% 0}to{background-position:-20% 0}}.projects-grid{grid-template-columns:minmax(0,.95fr) minmax(0,1.15fr) minmax(320px,.85fr)}.review-grid{grid-template-columns:repeat(auto-fit,minmax(150px,1fr))}.builder-grid,.game-grid{display:grid;gap:20px}.game-grid{grid-template-columns:minmax(0,1.45fr) minmax(320px,.95fr)}.arena-control-bar,.arena-scoreboard,.builder-badge-row,.builder-node-tray,.builder-scenario-list{display:grid;gap:16px}.arena-name-field{display:grid;gap:8px;max-width:360px}.arena-name-field input{border-radius:14px;border:1px solid var(--line);padding:12px 14px;background:rgba(255,255,255,.92)}.arena-scoreboard{grid-template-columns:repeat(auto-fit,minmax(180px,1fr))}.arena-challenge-card,.arena-result-card,.arena-score-card,.builder-result-card,.empty-state-card{border-radius:18px;padding:18px;border:1px solid var(--line);background:rgba(255,255,255,.92)}.empty-state-card{display:grid;gap:12px;background:linear-gradient(180deg,rgba(15,118,110,.08),rgba(255,255,255,.94))}.not-found-panel{background:radial-gradient(circle at top left,rgba(154,52,18,.14),transparent 32%),linear-gradient(180deg,rgba(255,255,255,.92),rgba(246,242,235,.96))}.primary-button:disabled,.secondary-button:disabled,button:disabled{cursor:not-allowed;opacity:.66;transform:none}.arena-score-card.is-self{border-color:rgba(15,118,110,.28);background:linear-gradient(180deg,rgba(15,118,110,.1),rgba(255,255,255,.94))}.arena-prompt{font-size:1.05rem;color:var(--ink)}.arena-code{margin:0;padding:16px;border-radius:16px;border:1px solid rgba(23,24,28,.12);background:#182028;color:#e9eef5;overflow:auto}.arena-choice{width:100%;justify-content:flex-start;text-align:left;cursor:pointer}.arena-choice.selected{border-color:rgba(15,118,110,.36);background:rgba(15,118,110,.14)}.arena-metric-grid,.builder-metric-grid{display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(180px,1fr))}.arena-leaderboard-row{padding:14px 0;border-top:1px solid rgba(23,24,28,.1)}.arena-leaderboard-row:first-child{border-top:none;padding-top:0}.builder-scenario-list{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}.builder-scenario-card{display:grid;gap:10px;text-align:left;padding:18px;border-radius:18px;border:1px solid var(--line);background:rgba(255,255,255,.86);cursor:pointer}.builder-scenario-card.is-selected{border-color:rgba(15,118,110,.34);background:linear-gradient(180deg,rgba(15,118,110,.08),rgba(255,255,255,.92))}.builder-scenario-card.is-locked{opacity:.55;cursor:not-allowed}.builder-grid{grid-template-columns:minmax(0,1.2fr) minmax(280px,.8fr)}.builder-canvas{position:relative;min-height:560px;border-radius:24px;border:1px solid rgba(23,24,28,.1);background:radial-gradient(circle at top,rgba(15,118,110,.09),transparent 34%),linear-gradient(180deg,rgba(255,255,255,.92),rgba(246,242,235,.94));overflow:hidden}.builder-lines{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}.builder-lines line{stroke:rgba(15,118,110,.36);stroke-width:1.2;stroke-linecap:round;stroke-dasharray:2 2}.builder-slot{position:absolute;width:190px;min-height:120px;transform:translate(-50%,-50%);border-radius:18px;padding:14px;border:1px dashed rgba(23,24,28,.18);background:rgba(255,255,255,.95);display:grid;gap:8px;box-shadow:0 16px 32px rgba(23,24,28,.08)}.builder-slot.is-correct{border-color:rgba(15,118,110,.4)}.builder-slot.is-incorrect{border-color:rgba(185,28,28,.42);background:rgba(255,241,242,.96)}.builder-node-tray{align-content:flex-start}.builder-node{display:grid;gap:8px;width:100%;padding:14px;border:none;border-radius:16px;color:white;text-align:left;cursor:grab}.builder-node span{font-size:.88rem;line-height:1.45}.builder-node.placed{cursor:pointer}.inset-panel{padding:18px;border-radius:18px;border:1px solid var(--line);background:rgba(255,255,255,.84)}@media (max-width:640px){.app-shell{padding:16px}.site-nav{width:100%}.primary-button,.prompt-pill,.secondary-button,.site-nav a{width:100%;justify-content:center;text-align:center}.choice-item{padding:14px 16px}}@media (max-width:980px){.analytics-form-grid,.builder-grid,.game-grid,.hero,.insight-grid,.lesson-card,.lesson-layout-grid,.projects-grid,.review-grid,.two-column-grid,.video-panel-grid{grid-template-columns:1fr}.site-header{flex-direction:column}.site-footer-grid{grid-template-columns:1fr}.builder-slot{width:160px;min-height:100px}.heatmap-grid{grid-template-columns:repeat(12,minmax(0,1fr))}}