:root{--bg:#f7f8fa;--card:#fff;--ink:#17202a;--mut:#5d6d7e;--pri:#1a73e8;--ok:#1e9e62;--warn:#e67e22;--mark:#8e44ad;--line:#e5e8ec}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial;background:var(--bg);color:var(--ink)}.nav{position:sticky;top:0;z-index:10;display:flex;justify-content:space-between;align-items:center;padding:10px 14px;background:#fff;border-bottom:1px solid var(--line)}.brand{font-weight:800;text-decoration:none;color:var(--ink);font-size:18px}.links a{margin-left:12px;text-decoration:none;color:var(--pri);font-weight:600;font-size:14px}.wrap{max-width:760px;margin:0 auto;padding:14px}.card{background:var(--card);border:1px solid var(--line);border-radius:12px;padding:14px;margin:10px 0}.mut{color:var(--mut)}.small{font-size:13px}.btn{display:inline-block;border:1px solid var(--line);background:#fff;padding:10px 14px;border-radius:10px;font-weight:700;cursor:pointer;text-decoration:none;color:var(--ink);font-size:14px}.btn.pri{background:var(--pri);color:#fff;border-color:var(--pri)}.btn.danger{background:#fff;color:#c0392b;border-color:#e6b0aa}.btn:disabled{opacity:.5}.row{display:flex;gap:8px;flex-wrap:wrap;align-items:center}.grid2{display:grid;grid-template-columns:1fr;gap:8px}input,textarea,select{width:100%;padding:10px;border:1px solid var(--line);border-radius:10px;font-size:14px}textarea{min-height:160px;font-family:ui-monospace,Consolas,monospace}.opt{display:block;width:100%;text-align:left;margin:8px 0;padding:12px;border:1.5px solid var(--line);border-radius:10px;background:#fff;cursor:pointer;font-size:15px}.opt.sel{border-color:var(--pri);background:#eaf2fe}.timer{font-variant-numeric:tabular-nums;font-weight:800;background:#17202a;color:#fff;padding:6px 10px;border-radius:8px}.sticky-test-head{position:sticky;top:53px;z-index:5;background:var(--bg);padding:8px 0}.palette-row{display:flex;gap:6px;overflow-x:auto;padding:8px 2px;-webkit-overflow-scrolling:touch;scrollbar-width:thin}.palette-row .q{flex:0 0 auto;width:38px;height:38px;border-radius:9px;border:1px solid var(--line);background:#fff;font-weight:700;cursor:pointer}.palette-row .q.seen{border-color:var(--warn);color:var(--warn)}.palette-row .q.ans{background:var(--ok);border-color:var(--ok);color:#fff}.palette-row .q.mark{background:var(--mark);border-color:var(--mark);color:#fff}.palette-row .q.cur{outline:2px solid var(--pri)}.legend{display:flex;gap:10px;font-size:12px;color:var(--mut);flex-wrap:wrap}.dot{display:inline-block;width:10px;height:10px;border-radius:3px;margin-right:4px}.test-foot{position:sticky;bottom:0;background:var(--bg);padding:10px 0;display:flex;gap:8px}.test-foot .btn{flex:1;text-align:center}table.score{width:100%;border-collapse:collapse;font-size:14px}table.score td{padding:6px 4px;border-bottom:1px solid var(--line)}.modal-ov{position:fixed;top:0;right:0;bottom:0;left:0;z-index:50;background:#17202a8c;display:flex;align-items:center;justify-content:center;padding:16px}.modal{background:#fff;border-radius:14px;padding:18px;width:100%;max-width:420px;box-shadow:0 12px 40px #00000040}.modal input{margin-top:4px}.nocopy{user-select:none;-webkit-user-select:none;-ms-user-select:none}.nocopy input,.nocopy textarea{user-select:text;-webkit-user-select:text}.foot{text-align:center;color:var(--mut);font-size:12px;padding:18px}@media (min-width:700px){.grid2{grid-template-columns:1fr 1fr}.wrap{padding:20px}.opt{font-size:16px}}