:root{
  --bg:#f4f6f9; --card:#fff; --text:#111827; --muted:#6b7280;
  --primary:#2563eb; --danger:#dc2626; --border:#e5e7eb;
  --shadow:0 8px 24px rgba(0,0,0,.08);
}
*{box-sizing:border-box}
body{margin:0;font-family:system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;background:var(--bg);color:var(--text)}
.topbar{background:#0b1220;color:#fff;padding:14px 16px}
.brand{display:flex;gap:12px;align-items:center;max-width:980px;margin:0 auto}
.logo{width:42px;height:42px;border-radius:10px;background:#1f2a44;display:flex;align-items:center;justify-content:center;font-weight:700}
.title{font-weight:700}
.subtitle{font-size:12px;color:#c7d2fe}
.container{max-width:980px;margin:16px auto;padding:0 16px;display:flex;flex-direction:column;gap:16px}
.card{background:var(--card);border:1px solid var(--border);border-radius:14px;box-shadow:var(--shadow);padding:16px}
.hidden{display:none}
h2{margin:0 0 12px}
label{display:block;font-size:12px;color:var(--muted);margin-bottom:6px}
input,select,textarea{width:100%;padding:10px;border:1px solid var(--border);border-radius:10px;font-size:14px}
textarea{min-height:140px;font-family:ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace}
.grid2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.grid3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:12px}
.inline{display:flex;gap:10px;align-items:center;margin-top:22px}
.inlineLabel{margin:0;color:var(--muted);font-size:14px}
.actions{display:flex;gap:10px;margin-top:12px;flex-wrap:wrap}
button{border:0;border-radius:10px;padding:10px 14px;font-weight:600;cursor:pointer}
.primary{background:var(--primary);color:#fff}
.ghost{background:#eef2ff;color:#1e3a8a}
.danger{background:var(--danger);color:#fff}
.note{margin-top:12px;font-size:13px;color:var(--muted)}
.examHeader{display:flex;justify-content:space-between;gap:12px;align-items:center;margin-bottom:10px}
.meta{font-size:12px;color:var(--muted)}
.timer{background:#111827;color:#fff;padding:10px 12px;border-radius:12px;min-width:110px;text-align:center}
.timerLabel{font-size:11px;color:#c7d2fe}
.timerValue{font-size:18px;font-weight:800}
.toolbar{display:flex;gap:10px;flex-wrap:wrap;margin:10px 0 14px}
.qcard{border:1px solid var(--border);border-radius:12px;padding:12px;margin:12px 0}
.qhead{display:flex;justify-content:space-between;gap:10px;align-items:flex-start}
.qid{font-weight:800}
.qtags{font-size:12px;color:var(--muted)}
.choices{margin-top:10px;display:flex;flex-direction:column;gap:6px}
.choice{display:flex;gap:10px;align-items:flex-start}
.choice input{width:auto;margin-top:3px}
.codeBlock{margin-top:10px}
.badge{display:inline-block;padding:3px 8px;border-radius:999px;background:#f3f4f6;color:#111827;font-size:12px;border:1px solid var(--border)}
.hr{height:1px;background:var(--border);margin:14px 0}
.footer{max-width:980px;margin:0 auto;padding:12px 16px;color:var(--muted);font-size:12px}
.small{font-size:12px;color:var(--muted)}
.ok{color:#16a34a;font-weight:700}
.ko{color:#dc2626;font-weight:700}
@media (max-width:760px){
  .grid2,.grid3{grid-template-columns:1fr}
  .timer{min-width:auto}
}