:root{
  --bg:#0b1020;--bg2:#151d36;--panel:rgba(20,27,52,.92);--panel2:rgba(33,42,74,.98);
  --text:#eef2ff;--muted:#a5b4fc;--acc:#60a5fa;--acc2:#22d3ee;
}
@media (prefers-color-scheme: light){
  :root{
    --bg:#eef3ff;--bg2:#dbe7ff;--panel:rgba(255,255,255,.9);--panel2:#f8fbff;
    --text:#0f172a;--muted:#475569;--acc:#2563eb;--acc2:#06b6d4;
  }
}
*{box-sizing:border-box}
body{margin:0;font-family:Arial,sans-serif;color:var(--text);background:linear-gradient(160deg,var(--bg),var(--bg2))}
.wrap{max-width:920px;margin:0 auto;padding:16px}
.card{background:var(--panel);border-radius:22px;padding:18px;box-shadow:0 18px 36px rgba(0,0,0,.22)}
.hero{margin-bottom:14px}
h1{margin:0 0 6px;font-size:26px}.sub{margin:0;color:var(--muted)}
.toolbar{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:14px}
button,select{border:none;border-radius:14px;padding:12px 14px;font-size:14px}
button{background:var(--panel2);color:var(--text);cursor:pointer}
button.primary{background:linear-gradient(135deg,var(--acc),var(--acc2));color:#082f49;font-weight:700}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-bottom:14px}
.stat .label{color:var(--muted);font-size:12px}.stat .value{font-size:22px;font-weight:700;margin-top:4px}
.badges{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:10px}
.badge{padding:6px 10px;border-radius:999px;background:rgba(255,255,255,.08);color:var(--muted);font-size:12px}
.question{font-size:28px;line-height:1.45;margin:8px 0}.furi{color:var(--muted);margin-bottom:12px}
.choices{display:grid;gap:10px}.choice{text-align:left;padding:14px 16px;border-radius:16px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.06);cursor:pointer}
.choice.correct{background:rgba(34,197,94,.2);border-color:rgba(34,197,94,.7)}
.choice.wrong{background:rgba(239,68,68,.2);border-color:rgba(239,68,68,.7)}
.explain{margin-top:14px;padding:14px 16px;border-radius:16px;background:rgba(96,165,250,.12)}
.hidden{display:none}
@media (max-width:700px){.stats{grid-template-columns:repeat(2,1fr)}.question{font-size:22px}}