:root{--bg:#0f172a;--panel:#1e293b;--panel2:#273449;--text:#e2e8f0;--muted:#94a3b8;--accent:#38bdf8;--accent-ink:#082f49;--ok:#4ade80;--bad:#f87171;--warn:#fbbf24;--line:#ffffff14}*{box-sizing:border-box}html,body{background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;margin:0;padding:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif}main{max-width:520px;min-height:100dvh;margin:0 auto;padding:20px 16px 48px}h1{margin:6px 0;font-size:26px}h2{margin:18px 0 8px;font-size:20px}a{color:var(--accent)}.card{background:var(--panel);border:1px solid var(--line);border-radius:12px;margin:12px 0;padding:16px}.btn{width:100%;color:var(--accent-ink);background:var(--accent);cursor:pointer;text-align:center;border:none;border-radius:10px;padding:14px;font-size:16px;font-weight:600;display:inline-block}.btn:disabled{opacity:.5;cursor:not-allowed}.btn.secondary{background:var(--panel2);color:var(--text);border:1px solid var(--line)}.btn.danger{color:var(--bad);border:1px solid var(--bad);background:0 0}.btn.small{width:auto;padding:8px 12px;font-size:14px}.row{align-items:center;gap:8px;display:flex}.between{justify-content:space-between;align-items:center;gap:8px;display:flex}label{color:var(--muted);margin:10px 0 4px;font-size:13px;display:block}input,textarea{background:var(--bg);width:100%;color:var(--text);border:1px solid var(--line);border-radius:8px;padding:12px;font-size:16px}.muted{color:var(--muted)}.error{color:var(--bad);margin:8px 0;font-size:14px}.ok{color:var(--ok)}.big{font-variant-numeric:tabular-nums;text-align:center;font-size:44px;font-weight:800}.pill{background:var(--panel2);color:var(--muted);border-radius:999px;padding:2px 10px;font-size:12px;display:inline-block}.option{text-align:left;background:var(--panel2);width:100%;color:var(--text);border:2px solid var(--line);cursor:pointer;border-radius:10px;margin:8px 0;padding:16px;font-size:17px;display:block}.option.selected{border-color:var(--accent)}.option.correct{border-color:var(--ok);background:#4ade801f}.option.wrong{border-color:var(--bad);background:#f871711f}.option:disabled{cursor:default}.list-item{border-bottom:1px solid var(--line);justify-content:space-between;align-items:center;padding:12px 0;display:flex}