:root{--bg: #f6f7fb;--surface: #ffffff;--surface-2: #eef1f8;--ink: #18202f;--muted: #5a6476;--border: #e1e5ee;--primary: #1d4ed8;--primary-ink: #ffffff;--primary-soft: #e3ebff;--accent: #f59e0b;--success: #15803d;--danger: #c2410c;--g-peti: #059669;--g-sesti: #0891b2;--g-sedmi: #6d28d9;--g-osmi: #db2777;--g-deveti: #d97706;--radius: 14px;--shadow: 0 1px 2px rgb(16 24 40 / 6%), 0 4px 16px rgb(16 24 40 / 6%);--shadow-lg: 0 12px 32px rgb(16 24 40 / 14%);--font: "Nunito", system-ui, -apple-system, "Segoe UI", sans-serif;--font-display: "Fraunces", Georgia, serif;color-scheme:light}@media (prefers-color-scheme: dark){:root:not([data-theme=light]){--bg: #0f1420;--surface: #171e2d;--surface-2: #1f2839;--ink: #e8ecf4;--muted: #9aa5b8;--border: #2a3448;--primary: #6c9bff;--primary-ink: #0b1020;--primary-soft: #1d2a48;--shadow: 0 1px 2px rgb(0 0 0 / 30%), 0 4px 16px rgb(0 0 0 / 25%);color-scheme:dark}}:root[data-theme=dark]{--bg: #0f1420;--surface: #171e2d;--surface-2: #1f2839;--ink: #e8ecf4;--muted: #9aa5b8;--border: #2a3448;--primary: #6c9bff;--primary-ink: #0b1020;--primary-soft: #1d2a48;color-scheme:dark}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.6 var(--font)}img{max-width:100%}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}h1,h2,h3{line-height:1.2;margin:0 0 .5em}h1{font-family:var(--font-display);font-size:clamp(1.7rem,3.5vw,2.4rem);letter-spacing:-.01em}button{font:inherit;cursor:pointer}input,select,textarea{font:inherit;color:inherit}.container{width:100%;max-width:1200px;margin:0 auto;padding:0 16px}.container.narrow{max-width:760px}.muted{color:var(--muted)}.app{min-height:100vh;display:flex;flex-direction:column}.site-main{flex:1;padding-bottom:64px}.site-header{background:var(--surface);border-bottom:1px solid 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var(--border);border-radius:8px;background:#fff}.video-list{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,460px),1fr));gap:20px;margin-top:8px}.video-item{margin:0;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}.video-item video{width:100%;display:block;background:#000;aspect-ratio:16 / 9}.video-item figcaption{padding:10px 14px;font-weight:700}.interactive-frame{border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;background:#fff;box-shadow:var(--shadow)}.interactive-frame iframe{display:block;width:100%;height:min(80vh,900px);border:0}.interactive-open{display:inline-block;margin-top:8px;font-size:.9rem;font-weight:700}.pager{display:flex;justify-content:space-between;gap:16px;margin-top:48px;padding-top:20px;border-top:1px solid var(--border)}.pager-link{display:flex;align-items:center;gap:8px;max-width:48%;padding:12px 16px;border:1px solid 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var(--border);border-radius:var(--radius);box-shadow:var(--shadow-lg)}.quiz-score{display:flex;align-items:center;gap:16px;flex-wrap:wrap;padding:16px 20px;border-radius:var(--radius);margin-bottom:18px}.quiz-score strong{font:700 2rem/1 var(--font-display)}.quiz-score.good{background:#dcfce7;color:#14532d}.quiz-score.bad{background:#ffedd5;color:#7c2d12}.quiz-score .btn{margin-left:auto}.grading{display:grid;grid-template-columns:1fr 1fr;gap:20px;align-items:start}.panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow);margin-bottom:20px}.panel h2{font-size:1.2rem}.table{width:100%;border-collapse:collapse;font-size:.95rem}.table th,.table td{text-align:left;padding:9px 10px;border-bottom:1px solid var(--border)}.table th{font-size:.78rem;text-transform:uppercase;letter-spacing:.05em;color:var(--muted)}.grade-table tr.highlight td{background:var(--primary-soft)}.grade-pill{display:inline-grid;place-items:center;width:26px;height:26px;border-radius:50%;color:#fff;font-weight:800;font-size:.85rem;margin-right:4px}.g1{background:#dc2626}.g2{background:#ea580c}.g3{background:#ca8a04}.g4{background:#2563eb}.g5{background:#16a34a}.count-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:12px}.result-line{font-size:1.05rem;margin:16px 0 0}.result-line .big{font:700 1.8rem/1 var(--font-display);color:var(--primary)}.bars{display:grid;gap:8px;margin-top:16px}.bar-row{display:grid;grid-template-columns:90px 1fr 56px;gap:10px;align-items:center;font-size:.88rem}.bar-track{height:12px;background:var(--surface-2);border-radius:999px;overflow:hidden}.bar-fill{display:block;height:100%;border-radius:999px;transition:width .3s}.bar-value{text-align:right;font-weight:700}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:9px 16px;border-radius:10px;border:1px solid var(--border);background:var(--surface);color:var(--ink);font-weight:700;white-space:nowrap}.btn:hover{border-color:var(--primary);color:var(--primary);text-decoration:none}.btn-primary{background:var(--primary);border-color:var(--primary);color:var(--primary-ink)}.btn-primary:hover{filter:brightness(1.08);color:var(--primary-ink)}.btn-primary:disabled{opacity:.55;cursor:not-allowed}.btn-ghost{background:transparent}.btn-danger{color:var(--danger);border-color:currentColor;background:transparent}.btn-small{padding:5px 10px;font-size:.85rem}.form{display:grid;gap:14px}.form-row{display:flex;gap:14px;flex-wrap:wrap}.form-row>.field{flex:1 1 200px}.form-row>.field.grow{flex:3 1 280px}.form-row>.field.small{flex:0 1 120px}.field{display:flex;flex-direction:column;gap:6px;font-weight:700;font-size:.9rem}.field.inline{flex-direction:row;align-items:center;justify-content:space-between;gap:12px;margin:12px 0}.field.inline input{width:120px}.field input,.field select,.field textarea,.filters 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