:root{--bg:#f5f6f8;--surface:#fff;--surface-2:#eceef2;--border:#d8dce3;--text:#1b2330;--muted:#667080;--accent:#2f6fed;--accent-strong:#1e5fdd;--on-accent:#fff;--success:#178a4c;--warning:#b45309;--danger:#d33d2e;--danger-strong:#b32d20;--radius:8px;--radius-sm:6px;--shadow:0 1px 2px #1018280f, 0 4px 14px #1018280f;--shadow-lg:0 12px 40px #10182838}@media (prefers-color-scheme:dark){:root{--bg:#101318;--surface:#181c23;--surface-2:#20252e;--border:#2b323d;--text:#e6eaf1;--muted:#8b95a6;--accent:#5b93ff;--accent-strong:#3b7bff;--on-accent:#0d1117;--success:#3ecf7a;--warning:#f0a33a;--danger:#f26d5f;--danger-strong:#ff8577;--shadow:0 1px 2px #00000080;--shadow-lg:0 12px 40px #0009}}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);margin:0;font:15px/1.45 -apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif}h1,h2,h3{margin:0;font-weight:650}a{color:var(--accent)}.shell{grid-template-columns:224px 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10px}.input:focus{outline:2px solid var(--accent);outline-offset:-1px}.input-error,.input-error:focus{border-color:var(--danger);outline-color:var(--danger)}textarea.input{resize:vertical;min-height:64px}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow)}.table{border-collapse:collapse;width:100%;font-size:14px}.table th,.table td{text-align:left;border-bottom:1px solid var(--border);padding:10px 12px}.table th{text-transform:uppercase;letter-spacing:.04em;color:var(--muted);-webkit-user-select:none;user-select:none;font-size:12px}.table th.sortable{cursor:pointer}.table th.sortable:hover{color:var(--text)}.table tbody tr:hover{background:var(--surface-2)}.table tbody tr.clickable{cursor:pointer}.table tr:last-child td{border-bottom:none}.badge{border-radius:999px;padding:2px 8px;font-size:12px;font-weight:600;display:inline-block}.badge-easy{background:color-mix(in srgb, var(--success) 15%, 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