:root{--maroon: #7A1629;--maroon-deep: #4a0d18;--gold: #FFC53D;--gold-deep: #E8A50B;--bg: #FFF8EC;--card: #ffffff;--ink: #2a1a1d;--muted: #6b5a5d;--line: rgba(255, 197, 61, .45);--ok: #1f8a4c;--bad: #c62828;--shadow: 0 4px 14px rgba(122, 22, 41, .1);color-scheme:light}@media (prefers-color-scheme: dark){:root{--bg: #1a1012;--card: #261a1d;--ink: #f4eaec;--muted: #c2afb3;--line: rgba(255, 197, 61, .3);--shadow: 0 4px 14px rgba(0, 0, 0, .35);color-scheme:dark}}*{box-sizing:border-box}html,body{margin:0}body{background:var(--bg);color:var(--ink);font:16px/1.6 Hind Siliguri,system-ui,sans-serif}a{color:inherit}button{font:inherit}img{max-width:100%}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:999px;padding:10px 20px;background:var(--maroon);color:#fff;font-weight:700;cursor:pointer;text-decoration:none}.btn:hover{filter:brightness(1.08)}.btn:disabled{opacity:.6;cursor:default}.btn.gold{background:var(--gold);color:#3a0b14}.btn.ghost{background:transparent;color:inherit;border:1.5px solid currentColor}.btn.sm{padding:6px 14px;font-size:14px}.btn.lg{padding:14px 28px;font-size:18px}.badge{display:inline-block;border-radius:999px;padding:2px 10px;font-size:13px;font-weight:700;vertical-align:middle}.badge-ok{background:#1f8a4c24;color:var(--ok)}.badge-gold{background:#ffc53d4d;color:#7a4b00}.badge-muted{background:#6b5a5d26;color:var(--muted)}@media (prefers-color-scheme: dark){.badge-gold{color:var(--gold)}}.card{background:var(--card);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow)}.muted{color:var(--muted)}.error-box{background:#c628281a;color:var(--bad);border-radius:12px;padding:12px 16px;margin:12px 0}.error-text{color:var(--bad);margin:8px 0 0}.ok-text{color:var(--ok);margin:8px 0 0;font-weight:600}.hint-box{background:#ffc53d2e;border-radius:14px;padding:12px 16px;margin:20px 0}.spinner{width:36px;height:36px;margin:48px auto;border-radius:50%;border:4px solid rgba(122,22,41,.2);border-top-color:var(--maroon);animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.center-screen{min-height:100vh;display:grid;place-items:center}.shell{min-height:100vh;display:flex;flex-direction:column}.topbar{background:linear-gradient(135deg,var(--maroon),var(--maroon-deep));color:#fff;display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 16px;position:sticky;top:0;z-index:10}.brand{display:flex;align-items:center;gap:10px;text-decoration:none;min-width:0}.brand img{width:44px;height:44px;border-radius:50%}.brand b{display:block;font-size:20px;line-height:1.1}.brand 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40px}.hero-logo{width:132px;height:132px;border-radius:50%;box-shadow:0 6px 24px #00000059}.hero h1{font-size:40px;margin:12px 0 0}.tagline{color:var(--gold);font-size:18px;margin:4px 0 8px}.lead{font-size:18px;margin:0 0 24px}.hero .hint{opacity:.85;font-size:14px;margin-top:14px}.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:16px;max-width:1000px;margin:28px auto;padding:0 16px}.feature{padding:20px}.feature-icon{font-size:32px}.feature h3{margin:6px 0 4px;color:var(--maroon)}@media (prefers-color-scheme: dark){.feature h3{color:var(--gold)}}.feature 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6px}.pay-methods{font-size:13px;color:var(--muted)}.enroll-cta{text-align:center;min-width:220px}.price{font-size:34px;font-weight:700;color:var(--maroon)}@media (prefers-color-scheme: dark){.price{color:var(--gold)}}.subject-layout{display:grid;grid-template-columns:220px 1fr;gap:16px;align-items:start}.subject-tabs{display:flex;flex-direction:column;gap:6px}.subject-tabs button{text-align:left;border:1px solid var(--line);background:var(--card);color:inherit;border-radius:12px;padding:10px 14px;cursor:pointer;font-weight:600}.subject-tabs button.active{background:var(--maroon);color:#fff;border-color:var(--maroon)}@media (max-width: 720px){.subject-layout{grid-template-columns:1fr}.subject-tabs{flex-direction:row;overflow-x:auto;padding-bottom:4px}.subject-tabs button{white-space:nowrap}}.list{display:flex;flex-direction:column;gap:10px}.row-card{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 18px;text-align:left;color:inherit;cursor:pointer}.row-card:hover{border-color:var(--gold-deep)}.row-title{font-weight:600;font-size:17px}.arrow{font-size:22px;color:var(--muted)}.locked{padding:20px;text-align:center}.material{padding:16px 18px}.material-type{font-size:13px;font-weight:700;color:var(--gold-deep)}.material-head{display:flex;align-items:center;justify-content:space-between;gap:12px}.material-head h3{margin:2px 0;font-size:18px}.material-content{white-space:pre-wrap;margin:8px 0 0}.type-pdf .material-type{color:#e0453a}.pdf-modal{position:fixed;top:0;right:0;bottom:0;left:0;z-index:50;background:#1b1b1b;display:flex;flex-direction:column}.pdf-bar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:10px 16px;background:var(--maroon);color:#fff}.pdf-bar b{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.pdf-modal iframe{flex:1;width:100%;border:0;background:#fff}