:root{
      --bg:#0f172a; --panel:#111827; --soft:#1f2937; --line:#334155;
      --text:#e5e7eb; --muted:#94a3b8; --ok:#16a34a; --bad:#dc2626; --accent:#2563eb;
      --warn:#f59e0b;
    }
    *{box-sizing:border-box}
    body{margin:0;font-family:Inter,Segoe UI,Arial,sans-serif;background:linear-gradient(180deg,#0b1020,#111827);color:var(--text)}
    .wrap{max-width:1150px;margin:0 auto;padding:24px}
    .hero{display:flex;justify-content:space-between;gap:20px;align-items:center;margin-bottom:24px;flex-wrap:wrap}
    .title{font-size:34px;font-weight:800;letter-spacing:-.02em}
    .subtitle{color:var(--muted);margin-top:6px}
    .grid{display:grid;gap:16px}
    .cards{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
    .card{background:rgba(17,24,39,.9);border:1px solid var(--line);border-radius:22px;padding:18px;box-shadow:0 14px 40px rgba(0,0,0,.18)}
    h2,h3{margin:0 0 12px}
    h3{font-size:18px}
    label{display:block;font-size:13px;color:var(--muted);margin-bottom:6px}
    input,textarea,select{width:100%;padding:12px 14px;border-radius:14px;border:1px solid var(--line);background:#0b1220;color:var(--text);outline:none}
    textarea{min-height:88px;resize:vertical}
    button{border:0;border-radius:14px;padding:12px 16px;font-weight:700;cursor:pointer;background:var(--accent);color:white}
    button.secondary{background:#1e293b}
    button.ok{background:var(--ok)}
    button.warn{background:var(--warn);color:#111827}
    button.bad{background:var(--bad)}
    .row{display:flex;gap:10px;flex-wrap:wrap}
    .row > *{flex:1}
    .small{font-size:12px;color:var(--muted)}
    .hidden{display:none !important}
    .pill{display:inline-block;padding:7px 12px;border-radius:999px;background:#172033;border:1px solid var(--line);color:#cbd5e1;font-size:12px}
    .list{display:grid;gap:10px}
    .item{padding:12px;border:1px solid var(--line);border-radius:14px;background:#0b1220}
    .option{padding:18px;border-radius:18px;border:1px solid var(--line);background:#111827;cursor:pointer;font-weight:700}
    .option:hover{transform:translateY(-1px);border-color:#4b5563}
    .option.correct{background:rgba(22,163,74,.16);border-color:#16a34a}
    .option.wrong{background:rgba(220,38,38,.16);border-color:#dc2626}
    .center{text-align:center}
    .question-box{padding:22px;border-radius:24px;background:#0b1220;border:1px solid var(--line)}
    .question-big{font-size:28px;font-weight:800;line-height:1.2;margin-bottom:20px}
    .options-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
    .score{font-size:44px;font-weight:900}
    .rank-table{width:100%;border-collapse:collapse}
    .rank-table th,.rank-table td{padding:12px;border-bottom:1px solid var(--line);text-align:left}
    .topbar{display:flex;justify-content:space-between;gap:10px;align-items:center;flex-wrap:wrap;margin-bottom:14px}
    .notice{padding:12px 14px;border-radius:14px;background:#0b1220;border:1px solid var(--line);color:#cbd5e1}
    .success{border-color:#166534;background:rgba(22,163,74,.1)}
    .danger{border-color:#991b1b;background:rgba(220,38,38,.1)}
    .warning{border-color:#92400e;background:rgba(245,158,11,.1)}
    .mono{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
    .stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:12px}
    .stat{padding:16px;border-radius:18px;background:#0b1220;border:1px solid var(--line)}
    .stat .k{font-size:12px;color:var(--muted)}
    .stat .v{font-size:24px;font-weight:800;margin-top:6px}
    .timer-big{display:flex;align-items:center;justify-content:center;min-height:96px;border-radius:22px;background:linear-gradient(180deg,#0b1220,#101a30);border:1px solid var(--line);font-size:52px;font-weight:900;letter-spacing:-.03em;margin:12px 0 6px}
    .timer-sub{font-size:12px;color:var(--muted);text-align:center}
    .progress-wrap{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px;flex-wrap:wrap}
    .progress-label{font-size:14px;font-weight:800;color:#dbeafe}
    .progress-bar{height:10px;background:#0b1220;border:1px solid var(--line);border-radius:999px;overflow:hidden;flex:1;min-width:160px}
    .progress-fill{height:100%;background:linear-gradient(90deg,#2563eb,#60a5fa);width:0%}
    .option.option-a{background:#e21b3c;border-color:#ef4444;color:#fff}
    .option.option-b{background:#1368ce;border-color:#3b82f6;color:#fff}
    .option.option-c{background:#d89e00;border-color:#f59e0b;color:#111827}
    .option.option-d{background:#26890c;border-color:#22c55e;color:#fff}
    .option.option-a:hover,.option.option-b:hover,.option.option-c:hover,.option.option-d:hover{filter:brightness(1.05);transform:translateY(-2px)}
    .option .letter{display:inline-flex;align-items:center;justify-content:center;width:34px;height:34px;border-radius:999px;background:rgba(255,255,255,.18);margin-right:10px;font-size:18px;font-weight:900}
    .question-media{width:100%;max-height:300px;object-fit:contain;border-radius:18px;border:1px solid var(--line);background:#0b1220;margin-bottom:16px}
    .option-content{display:flex;align-items:flex-start;gap:12px}
    .option-text{flex:1;min-width:0}
    .option-image{width:110px;height:78px;object-fit:cover;border-radius:12px;border:1px solid rgba(255,255,255,.25);background:rgba(255,255,255,.08);flex:0 0 auto}
    .teacher-media-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin-top:10px}
    .mini-badge{display:inline-block;padding:4px 8px;border-radius:999px;background:#172033;border:1px solid var(--line);font-size:11px;color:#cbd5e1;margin-top:8px;margin-right:6px}

    .results-card{margin-top:14px;padding:18px;border-radius:22px;background:#0b1220;border:1px solid var(--line)}
    .bars{display:grid;gap:12px}
    .bar-row{display:grid;grid-template-columns:36px 1fr 64px;gap:10px;align-items:center}
    .bar-label{font-weight:900;text-align:center}
    .bar-track{height:16px;background:#111827;border:1px solid var(--line);border-radius:999px;overflow:hidden}
    .bar-fill{height:100%;width:0%;border-radius:999px;animation:growBar .7s ease forwards}
    .bar-fill.option-a{background:#e21b3c}
    .bar-fill.option-b{background:#1368ce}
    .bar-fill.option-c{background:#d89e00}
    .bar-fill.option-d{background:#26890c}
    .bar-pct{text-align:right;font-weight:800;color:#cbd5e1}
    .correct-pill{display:inline-block;margin-top:10px;padding:8px 12px;border-radius:999px;background:rgba(22,163,74,.14);border:1px solid #16a34a;color:#dcfce7;font-weight:800}
    .rank-list{display:grid;gap:10px}
    .rank-row{display:grid;grid-template-columns:56px 1fr auto;gap:12px;align-items:center;padding:14px 16px;border-radius:18px;background:#0b1220;border:1px solid var(--line);opacity:0;transform:translateY(10px);animation:rankIn .45s ease forwards}
    .rank-medal{font-size:26px;text-align:center}
    .rank-name{font-weight:800;font-size:18px}
    .rank-score{font-weight:900;font-size:20px}
    .rank-row.top1{border-color:#f59e0b;background:linear-gradient(90deg,rgba(245,158,11,.15),rgba(11,18,32,.8))}
    .rank-row.top2{border-color:#94a3b8;background:linear-gradient(90deg,rgba(148,163,184,.14),rgba(11,18,32,.8))}
    .rank-row.top3{border-color:#b45309;background:linear-gradient(90deg,rgba(180,83,9,.14),rgba(11,18,32,.8))}
    .section-title-sm{font-size:13px;font-weight:900;letter-spacing:.04em;text-transform:uppercase;color:#93c5fd;margin-bottom:10px}
    @keyframes growBar{from{width:0%}to{width:var(--target-width,0%)}}
    @keyframes rankIn{to{opacity:1;transform:translateY(0)}}
    @media (max-width:700px){.options-grid{grid-template-columns:1fr}.question-big{font-size:22px}.title{font-size:28px}.timer-big{font-size:40px;min-height:82px}}