:root{--bg:#f6f8fb;--topbar-bg:rgba(246,248,251,0.88);--surface:#ffffff;--surface-muted:#f8fafc;--surface-elevated:#ffffff;--text:#0f172a;--muted:#64748b;--line:#e2e8f0;--line-soft:rgba(226,232,240,0.72);--tab-bg:#eef2ff;--tab-text:#3730a3;--tab-line:#c7d2fe;--video-bg:#0f172a;--blue:#2563eb;--blue-dark:#1d4ed8;--green:#16a34a;--green-soft:#dcfce7;--green-text:#166534;--amber:#b45309;--amber-soft:#fef3c7;--amber-text:#92400e;--red:#dc2626;--red-soft:#fee2e2;--red-text:#991b1b;--shadow:0 20px 45px rgba(15,23,42,0.08);--radius:8px}:root[data-theme=dark]{--bg:#090f1d;--topbar-bg:rgba(9,15,29,0.88);--surface:#101827;--surface-muted:#141f31;--surface-elevated:#182235;--text:#e5edf8;--muted:#95a3b8;--line:#26344a;--line-soft:rgba(38,52,74,0.78);--tab-bg:#17213a;--tab-text:#c7d2fe;--tab-line:#32446a;--video-bg:#020617;--blue:#60a5fa;--blue-dark:#3b82f6;--green:#4ade80;--green-soft:rgba(34,197,94,0.16);--green-text:#bbf7d0;--amber:#fbbf24;--amber-soft:rgba(245,158,11,0.16);--amber-text:#fde68a;--red:#f87171;--red-soft:rgba(248,113,113,0.16);--red-text:#fecaca;--shadow:0 24px 60px rgba(0,0,0,0.34);color-scheme:dark}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe 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var(--line);background:var(--surface);color:var(--text);font-size:.84rem;font-weight:850}.theme-toggle span:first-child{display:grid;place-items:center;width:18px;height:18px;border-radius:50%;background:var(--surface-muted);color:var(--blue)}.grid{grid-template-columns:minmax(0,1fr) 340px;grid-gap:24px}.admin-grid,.grid{display:grid;gap:24px;align-items:start}.admin-grid{grid-template-columns:300px minmax(0,1fr);grid-gap:24px}.admin-sidebar{position:-webkit-sticky;position:sticky;top:112px}.admin-main{min-width:0}.status-card{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:20px}.stack{display:grid;grid-gap:20px;gap:20px}.card{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow);min-width:0}.card-pad,.hero-copy{padding:24px}.hero-copy{border-bottom:1px solid var(--line)}.lesson-title-row{display:flex;align-items:flex-start;flex-wrap:wrap;gap:10px 12px;margin-bottom:8px}.hero-copy h2{margin:0;font-size:clamp(1.5rem,3.4vw,2.25rem);line-height:1.08}.hero-copy p,.muted{color:var(--muted)}.hero-copy p{max-width:760px;margin:0}.hero-copy .certificate-note{margin-top:10px;color:var(--green-text);font-weight:760}.video-frame{position:relative;aspect-ratio:16/9;overflow:hidden;background:var(--video-bg)}#player{width:100%;height:100%}#player,.video-facade{position:absolute;inset:0}.video-facade{display:grid;place-items:center;width:100%;height:100%;min-height:0;padding:0;overflow:hidden;border-radius:0;background:var(--video-bg);color:white}.video-facade img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover}.video-facade-overlay{position:relative;display:grid;place-items:center;width:74px;height:74px;border-radius:50%;background:rgba(15,23,42,.82);box-shadow:0 20px 50px rgba(0,0,0,.28)}.video-play-icon{width:0;height:0;margin-left:5px;border-bottom:15px solid transparent;border-left:24px solid white;border-top:15px solid transparent}.video-facade-copy{position:absolute;left:18px;bottom:18px;padding:8px 12px;border-radius:999px;background:rgba(15,23,42,.78);color:white;font-size:.92rem;font-weight:760}.video-facade:focus-visible .video-facade-overlay,.video-facade:hover .video-facade-overlay{background:var(--accent)}.video-facade:focus-visible{outline:3px solid var(--accent);outline-offset:-6px}.video-meta{display:grid;grid-gap:12px;gap:12px;padding:18px 24px 22px}.row{gap:16px;min-width:0}.progress-label,.row{display:flex;align-items:center;justify-content:space-between}.progress-label{gap:10px;color:var(--muted);font-size:.82rem;font-weight:750}.progress-track{height:8px;overflow:hidden;border-radius:999px;background:var(--surface-elevated)}.progress-fill{width:0;height:100%;border-radius:inherit;background:var(--blue);transition:width .24s ease}.pill{display:inline-flex;align-items:center;gap:8px;width:-moz-fit-content;width:fit-content;min-height:30px;padding:5px 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minmax(180px,1fr);grid-gap:14px;gap:14px}.answer-summary{display:grid;grid-gap:5px;gap:5px;align-content:end;min-height:64px;padding:10px 12px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface)}.answer-summary span,.option-editor-heading span{color:var(--muted);font-size:.78rem;font-weight:850;letter-spacing:.04em;text-transform:uppercase}.answer-summary strong{overflow-wrap:anywhere}.option-editor-heading{display:flex;align-items:center;justify-content:space-between;gap:12px}.answer-options{display:grid;grid-gap:10px;gap:10px}.answer-option-row{display:grid;grid-template-columns:minmax(96px,112px) minmax(0,1fr) auto;grid-gap:10px;gap:10px;align-items:center;padding:10px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface)}.correct-control{display:inline-flex;align-items:center;gap:8px;color:var(--muted);font-size:.84rem;font-weight:820}.correct-control 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ul{display:grid;grid-gap:6px;gap:6px;margin:0;padding-left:20px}.field{display:grid;grid-gap:7px;gap:7px}.field input,.field select,.field textarea{min-width:0;width:100%;border:1px solid var(--line);border-radius:var(--radius);padding:11px 12px;background:var(--surface);color:var(--text)}.field textarea{min-height:92px;resize:vertical}.split{grid-template-columns:repeat(2,minmax(0,1fr))}.admin-question,.split{display:grid;grid-gap:14px;gap:14px}.admin-question{padding:16px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface-muted)}.history-list{display:grid;grid-gap:12px;gap:12px;margin:0;padding:0;list-style:none}.history-item{padding:14px;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface-muted)}.lesson-history-actions{display:flex;align-items:center;flex-wrap:wrap;gap:8px;justify-content:flex-end}.lesson-status-chip{display:inline-flex;align-items:center;gap:7px;min-height:30px;padding:6px 10px;border:1px solid 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auto;grid-gap:12px;gap:12px;align-items:end;margin-top:20px}.profile-message{margin-top:10px}.profile-meter{display:grid;grid-gap:10px;gap:10px;margin-top:20px}.lesson-history-item{display:flex;align-items:center;justify-content:space-between;gap:12px}.lesson-filter{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));grid-gap:8px;gap:8px;margin-top:16px}.lesson-filter button{display:flex;align-items:center;justify-content:space-between;gap:8px;min-height:36px;padding:8px 10px;background:var(--surface-muted);color:var(--muted);font-size:.82rem;font-weight:850;box-shadow:none}.lesson-filter button.active{background:var(--blue-soft);color:var(--blue)}.lesson-filter strong{display:inline-grid;place-items:center;min-width:22px;min-height:22px;padding:0 6px;border-radius:999px;background:var(--surface);color:var(--text);font-size:.76rem}.empty-list-note{padding:14px;border:1px dashed 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