:root{--bg:#000000;--card:#0a0a0a;--text:#ffffff;--muted:#b3b3b3;--primary:#ffffff;--primary-press:#e5e5e5;--accent:#ffffff;--ok:#10b981;--err:#ef4444;--border:#1f1f1f}@import url("https://fonts.googleapis.com/css2?family=Inter:wght@400;600;700&display=swap");#__next,body,html{height:100%}body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica Neue,Arial,Apple Color Emoji,Segoe UI Emoji}.container{max-width:960px;margin:0 auto;padding:24px}@media (min-width:1280px){.container{max-width:1200px}}.scorebar{display:flex;align-items:center;justify-content:space-between;padding:12px 0 24px;position:-webkit-sticky;position:sticky;top:0;-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px)}.brand{font-weight:700;letter-spacing:.5px}.score{font-weight:600;color:var(--text)}main{display:grid;place-items:center}.grid{width:100%}.card{background:linear-gradient(180deg,rgba(255,255,255,.02),rgba(255,255,255,.01));border:1px solid var(--border);border-radius:16px;padding:24px;box-shadow:0 20px 40px rgba(0,0,0,.35)}.hero{text-align:center;position:relative;overflow:hidden}.hero:before{content:"";position:absolute;inset:-2px;background:radial-gradient(600px 200px at 50% -10%,rgba(128,128,128,.2),transparent 70%);pointer-events:none}.badge{display:inline-block;font-size:12px;color:#d1d5db;border:1px solid #2a2a2a;padding:6px 10px;border-radius:999px;margin-bottom:10px;background:rgba(128,128,128,.2)}.hero-title{margin:8px 0;font-size:28px;letter-spacing:.4px}.hero-sub{margin:0;color:var(--muted)}.hero-bullets{list-style:none;padding:0;margin:14px 0 0;color:var(--muted)}.hero-bullets li{margin:6px 0}.card-header h2{margin:4px 0 8px;font-size:22px}.muted{color:var(--muted);margin:0}.cover-wrap{position:relative}.cover,.cover-wrap{width:96px;height:96px}.cover{border-radius:12px;object-fit:cover;display:block}.unmute{position:absolute;inset:0;background:rgba(0,0,0,.55);color:#fff;border:1px solid #fff2;border-radius:12px;font-size:12px;cursor:pointer}.options{display:grid;grid-template-columns:repeat(1,minmax(0,1fr));grid-gap:10px;gap:10px;margin-top:2px}@media (min-width:640px){.options{grid-template-columns:repeat(2,1fr)}}.btn{background:transparent;color:var(--text);border:1px solid #2a2a2a;padding:16px 18px;border-radius:12px;cursor:pointer;transition:transform .06s ease,background .2s ease,color .2s ease,border-color .2s ease}.btn:hover{transform:translateY(-1px);background:#ffffff;color:#000000;border-color:#ffffff}.btn:active{transform:translateY(0);background:#e5e5e5;color:#000000}.btn:disabled{opacity:.5;cursor:not-allowed;transform:none}.btn.correct{border-color:rgba(16,185,129,.6);box-shadow:inset 0 0 0 2px rgba(16,185,129,.25)}.seg .seg-btn{background:transparent;color:var(--text);border:1px solid #2a2a2a;padding:8px 12px;cursor:pointer}.seg .seg-btn+.seg-btn{border-left:none}.seg .seg-btn:first-child{border-radius:10px 0 0 10px}.seg .seg-btn:last-child{border-radius:0 10px 10px 0}.seg .seg-btn.active{background:#ffffff;color:#000000;border-color:#ffffff}.skeleton{height:48px;background:#171a20;border-radius:8px;animation:pulse 1.2s ease-in-out infinite}@keyframes pulse{0%,to{opacity:.6}50%{opacity:1}}.feedback{margin-top:18px;padding:12px;border-radius:12px;border:1px solid var(--border);background:#12151a}.feedback.ok{border-color:rgba(16,185,129,.4)}.feedback.err{border-color:rgba(239,68,68,.4)}.feedback .desc{margin:8px 0 12px;color:var(--muted)}.btn.next{background:#ffffff;color:#000000;border-color:#ffffff}.btn.next:hover{background:#e5e5e5}