:root{--bg:#f7f8fb;--card:#fff;--text:#172033;--muted:#667085;--primary:#265bd7;--ok:#087443;--bad:#b42318;--border:#e4e7ec;--shadow:0 12px 32px rgba(16,24,40,.08)}
*{box-sizing:border-box}body{margin:0;font-family:Arial,Helvetica,sans-serif;background:linear-gradient(180deg,#f6f8ff,#fff);color:var(--text);line-height:1.55}.wrap{width:min(980px,calc(100% - 28px));margin:auto}.top{position:sticky;top:0;z-index:5;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}.nav{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:14px 0}.brand{font-weight:800;font-size:20px;color:var(--primary);text-decoration:none}.menu{display:flex;gap:8px;flex-wrap:wrap}.menu a,.btn{border:1px solid var(--border);background:#fff;color:var(--text);border-radius:999px;padding:9px 13px;text-decoration:none;font-weight:600;cursor:pointer}.menu a.active,.btn.primary{background:var(--primary);border-color:var(--primary);color:#fff}.hero{padding:30px 0 18px}.hero h1{margin:0 0 8px;font-size:clamp(26px,5vw,42px);letter-spacing:-.03em}.hero p{margin:0;color:var(--muted)}.panel,.qcard,.result{background:var(--card);border:1px solid var(--border);border-radius:22px;box-shadow:var(--shadow)}.panel{padding:18px;margin:16px 0}.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.field label{display:block;font-weight:800;margin-bottom:6px}.field input,.field select{width:100%;padding:12px;border:1px solid var(--border);border-radius:14px;font-size:16px}.stat{color:var(--muted)}.stat b{color:var(--text)}.qcard{padding:18px;margin:14px 0}.qtitle{font-weight:800;margin-bottom:12px}.qid{display:inline-flex;min-width:34px;height:34px;align-items:center;justify-content:center;background:#eef3ff;color:var(--primary);border-radius:50%;margin-right:8px}.option{display:flex;gap:10px;align-items:flex-start;border:1px solid var(--border);border-radius:14px;padding:11px 12px;margin:8px 0;background:#fff;cursor:pointer}.option input{margin-top:5px}.letter{font-weight:800;min-width:22px}.answer{display:none;margin-top:12px;padding:10px 12px;border-radius:14px;background:#ecfdf3;color:var(--ok);font-weight:700}.answer.show{display:block}.wrong{background:#fef3f2;color:var(--bad)}.correctLine{border-color:#75e0a7;background:#f6fef9}.badLine{border-color:#fda29b;background:#fffbfa}.locked .option{cursor:not-allowed;opacity:.82}.result{padding:22px;margin:16px 0}.score{font-size:34px;font-weight:900;color:var(--primary)}.actions{display:flex;gap:10px;flex-wrap:wrap;margin:18px 0 34px}.error{padding:14px;border-radius:14px;background:#fef3f2;color:var(--bad);border:1px solid #fecdca}
@media(max-width:640px){.nav{align-items:flex-start;flex-direction:column}.menu{width:100%;display:grid;grid-template-columns:1fr 1fr 1fr}.menu a,.btn{width:100%;text-align:center}.grid{grid-template-columns:1fr}.qcard{padding:14px;border-radius:18px}.actions .btn{width:100%}}
.notice{padding:14px;border-radius:14px;background:#fffaeb;color:#93370d;border:1px solid #fedf89;margin:12px 0}.grid.one{grid-template-columns:1fr}