:root{
  --navy:#06142f;
  --navy2:#0b2b62;
  --cyan:#16d7ff;
  --gold:#f6c453;
  --text:#f4f8ff;
  --muted:#b9c7dd;
  --border:rgba(255,255,255,.18);
  --dark:#030816;
}

*{box-sizing:border-box}

body{
  margin:0;
  min-height:100vh;
  font-family:Tahoma,Arial,sans-serif;
  color:var(--text);
  background:
    radial-gradient(circle at 15% 10%,rgba(22,215,255,.20),transparent 26%),
    radial-gradient(circle at 84% 22%,rgba(246,196,83,.16),transparent 30%),
    linear-gradient(135deg,var(--dark),var(--navy),var(--navy2));
}

.wrap{
  width:min(1100px,100%);
  margin:0 auto;
  padding:28px 18px 52px;
}

.topbar{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:14px;
  flex-wrap:wrap;
  margin-bottom:26px;
}

.back{
  color:#06142f;
  background:linear-gradient(135deg,var(--gold),#fff1b8);
  text-decoration:none;
  padding:10px 16px;
  border-radius:999px;
  font-weight:900;
}

.badge{
  color:#dff8ff;
  border:1px solid rgba(22,215,255,.35);
  background:rgba(22,215,255,.08);
  border-radius:999px;
  padding:8px 13px;
  font-weight:800;
}

.hero{
  border:1px solid var(--border);
  background:linear-gradient(180deg,rgba(255,255,255,.13),rgba(255,255,255,.07));
  border-radius:34px;
  padding:34px;
  box-shadow:0 30px 80px rgba(0,0,0,.32);
  backdrop-filter:blur(16px);
  margin-bottom:22px;
}

.hero h1{
  margin:0 0 14px;
  font-size:clamp(1.8rem,4vw,3.2rem);
  color:#ffe6a7;
}

.hero p{
  margin:0;
  color:var(--muted);
  line-height:1.9;
  font-size:1.08rem;
}

.grid{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:18px;
  margin-top:22px;
}

.panel{
  border:1px solid var(--border);
  background:rgba(255,255,255,.08);
  border-radius:26px;
  padding:24px;
  box-shadow:0 20px 54px rgba(0,0,0,.22);
}

.panel h2{
  margin:0 0 12px;
  color:var(--cyan);
}

.panel p,.panel li{
  color:var(--muted);
  line-height:1.85;
}

.card-list{
  display:grid;
  gap:12px;
}

.flip-card,.choice{
  border:1px solid rgba(255,255,255,.16);
  background:rgba(255,255,255,.07);
  border-radius:18px;
  padding:18px;
}

.flip-card{
  cursor:pointer;
  transition:.2s ease;
}

.flip-card:hover{
  transform:translateY(-3px);
  border-color:rgba(22,215,255,.55);
}

.big{
  font-size:2rem;
  color:white;
  font-weight:900;
}

.answer{
  margin-top:10px;
  color:#ffe6a7;
  display:none;
  font-weight:800;
}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  border:0;
  cursor:pointer;
  background:linear-gradient(135deg,var(--cyan),#dff8ff);
  color:#06142f;
  padding:11px 18px;
  border-radius:999px;
  font-weight:900;
  text-decoration:none;
  margin-top:12px;
  font-family:Tahoma,Arial,sans-serif;
}

.btn.gold{
  background:linear-gradient(135deg,var(--gold),#fff1b8);
}

.choice{
  cursor:pointer;
  margin:8px 0;
}

.choice.correct{
  border-color:rgba(34,197,94,.9);
  background:rgba(34,197,94,.14)
}

.choice.wrong{
  border-color:rgba(239,68,68,.9);
  background:rgba(239,68,68,.13)
}

.result{
  color:#ffe6a7;
  font-weight:900;
  margin-top:12px;
  line-height:1.9;
}

.table{
  width:100%;
  border-collapse:collapse;
  overflow:hidden;
  border-radius:18px;
}

.table th,.table td{
  padding:12px;
  border-bottom:1px solid rgba(255,255,255,.12);
  color:var(--muted);
  text-align:right;
}

.table th{
  color:#fff;
  background:rgba(255,255,255,.10);
}

.note{
  border-right:4px solid var(--gold);
  padding:14px 16px;
  background:rgba(246,196,83,.08);
  border-radius:16px;
  color:#ffe6a7;
  line-height:1.8;
}

input,select{
  width:100%;
  padding:12px 14px;
  border-radius:14px;
  border:1px solid rgba(255,255,255,.18);
  background:rgba(255,255,255,.08);
  color:white;
  font-family:Tahoma,Arial,sans-serif;
  font-size:1rem;
}

option{color:#06142f}

.footer{
  margin-top:32px;
  text-align:center;
  color:var(--muted);
  line-height:1.8;
}

@media(max-width:800px){
  .grid{grid-template-columns:1fr}
  .hero{padding:24px}
}