:root{--bg:#0f1724;--card:#0b1220;--accent:#7dd3fc;--muted:#9aa4b2}
*{box-sizing:border-box}
html,body{height:100%;margin:0;font-family:Inter, system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial}
body{background:linear-gradient(180deg,#061428 0%, #071a2a 100%);color:#e6eef6;display:flex;align-items:center;justify-content:center;padding:24px}
.app{width:100%;max-width:920px;background:rgba(255,255,255,0.03);border-radius:12px;padding:20px;box-shadow:0 8px 30px rgba(2,6,23,0.6)}
.topbar{display:flex;align-items:center;justify-content:space-between}
.topbar h1{margin:0;font-size:1.5rem}
.tag{color:var(--muted)}
main{margin-top:18px}
.view h2{margin:0 0 12px 0}
.card-row{display:flex;gap:12px}
.card{flex:1;padding:28px;border-radius:10px;background:linear-gradient(180deg,rgba(255,255,255,0.02),rgba(255,255,255,0.01));border:1px solid rgba(255,255,255,0.03);font-size:1.05rem;cursor:pointer}
.card:hover{transform:translateY(-4px);box-shadow:0 10px 30px rgba(0,0,0,0.5)}
.hidden{display:none}
.panel{margin-top:12px;padding:12px;border-radius:8px;background:rgba(255,255,255,0.02);min-height:120px}
.btn{display:inline-block;margin-top:12px;padding:8px 12px;border-radius:8px;border:0;background:var(--accent);color:#02203a;cursor:pointer}
.back{background:transparent;border:1px solid rgba(255,255,255,0.06);color:var(--muted);padding:8px 10px;border-radius:8px;margin-top:10px}
.muted{color:var(--muted)}
.quiz-card{display:flex;justify-content:space-between;align-items:center;padding:10px;border-radius:8px;margin-bottom:8px;border:1px solid rgba(255,255,255,0.03)}
.quiz-title{font-weight:600}
.foot{margin-top:16px;text-align:center;color:var(--muted);font-size:0.9rem}
.option{display:block;margin:8px 0;padding:10px;border-radius:8px;border:1px solid rgba(255,255,255,0.03);cursor:pointer}
.option:hover{transform:translateY(-2px)}
.score{font-weight:700;margin-top:10px}