*{box-sizing:border-box}
body{
  margin:0;min-height:100vh;font-family:Arial,Helvetica,sans-serif;color:#fff;
  background:radial-gradient(circle at top,#2b42a2 0%,#091540 48%,#030717 100%);
  padding:18px;display:flex;justify-content:center;align-items:flex-start
}
.app{width:min(1050px,100%);background:rgba(7,16,57,.94);border:1px solid rgba(255,255,255,.18);
  border-radius:26px;padding:22px;box-shadow:0 25px 70px rgba(0,0,0,.45)}
.top{display:flex;justify-content:space-between;gap:12px;align-items:center;margin-bottom:18px}
.logo,.small-btn{border:1px solid rgba(255,255,255,.2);background:rgba(255,255,255,.1);border-radius:999px;padding:10px 16px;font-weight:bold;color:#fff}
.small-btn{cursor:pointer}
.home{text-align:center}
.home h1{font-size:clamp(30px,5vw,54px);margin:16px 0 8px}
.home p{color:#d9dfff;font-size:18px;margin:0 auto 22px;max-width:760px;line-height:1.5}
.topics-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.topic-card{background:linear-gradient(180deg,#162b7d,#071850);border:2px solid #5366d6;border-radius:18px;padding:18px;
  min-height:130px;cursor:pointer;text-align:right;color:#fff;transition:.2s}
.topic-card:hover{transform:translateY(-3px);border-color:#f0c64a}
.topic-card h3{margin:0 0 10px;font-size:22px}
.topic-card p{margin:0;color:#dbe1ff;font-size:15px}
.hidden{display:none}
.game{background:linear-gradient(180deg,rgba(11,28,90,.96),rgba(6,12,40,.96));border-radius:22px;padding:20px;border:1px solid rgba(255,255,255,.15)}
.game-head{display:flex;justify-content:space-between;gap:14px;align-items:center;margin-bottom:16px}
.game-head h2{margin:0;font-size:28px}
.game-head p{margin:6px 0 0;color:#d9dfff}
.prize{background:linear-gradient(90deg,#e0a719,#fff0a6,#e0a719);color:#1a1400;padding:10px 18px;border-radius:999px;font-weight:bold;white-space:nowrap}
.question{background:#06134a;border:2px solid #4d62cb;border-radius:18px;padding:22px;min-height:105px;display:flex;align-items:center;justify-content:center;text-align:center;font-size:clamp(20px,3.5vw,31px);font-weight:bold;line-height:1.4;margin-bottom:18px}
.answers{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.answer{min-height:64px;border:2px solid #5366d6;background:linear-gradient(180deg,#14266e,#07174f);color:#fff;border-radius:16px;padding:14px 16px;font-size:17px;cursor:pointer;text-align:right;transition:.2s}
.answer:hover:not(:disabled){transform:translateY(-2px);border-color:#f0c64a}
.answer.correct{background:linear-gradient(180deg,#14804a,#07572e);border-color:#50e391}
.answer.wrong{background:linear-gradient(180deg,#b7293a,#71101d);border-color:#ff8090}
.answer:disabled{cursor:default}
.feedback{min-height:58px;margin-top:16px;line-height:1.5;text-align:center;font-size:17px;color:#f2f4ff}
.main-btn{display:none;width:100%;margin-top:12px;border:0;border-radius:14px;padding:14px;font-size:18px;font-weight:bold;cursor:pointer;background:#f0c64a;color:#160f00}
.main-btn.secondary{background:#fff;color:#091540}
.score{display:flex;justify-content:space-around;gap:12px;margin-top:18px;background:rgba(255,255,255,.08);border-radius:18px;padding:14px}
@media(max-width:820px){.topics-grid{grid-template-columns:1fr 1fr}.game-head{flex-direction:column;text-align:center}.answers{grid-template-columns:1fr}}
@media(max-width:560px){.topics-grid{grid-template-columns:1fr}.top,.score{flex-direction:column;text-align:center}.app{padding:15px}}