:root{
  --bg:#0b1020;
  --card:#121a33;
  --text:#e8ecff;
  --muted:#a7b0d6;
  --border:rgba(255,255,255,.10);
  --ok:#2dd4bf;
  --bad:#fb7185;
  --btn:#5b7cfa;
}

*{box-sizing:border-box}
body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial;
  background: radial-gradient(1200px 500px at 15% 10%, rgba(91,124,250,.18), transparent 55%),
              radial-gradient(900px 500px at 85% 30%, rgba(45,212,191,.14), transparent 55%),
              var(--bg);
  color:var(--text);
}
.wrap{max-width:900px; margin:0 auto; padding:24px;}
.top{display:flex; align-items:flex-start; justify-content:space-between; gap:12px; margin-bottom:14px;}
h1{margin:0; font-size:22px; font-weight:800;}
.muted{margin:6px 0 0; color:var(--muted); font-size:13px;}
.pill{
  border:1px solid var(--border);
  background: rgba(255,255,255,.06);
  padding:8px 12px;
  border-radius:999px;
  font-weight:700;
  font-size:13px;
}
.card{
  border:1px solid var(--border);
  background: linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.03));
  border-radius:16px;
  padding:18px;
  min-height:280px;
}

.qhead{display:flex; align-items:flex-start; justify-content:space-between; gap:12px; margin-bottom:12px;}
.qtitle{font-size:16px; font-weight:800; margin:0 0 6px 0;}
.qmeta{color:var(--muted); font-size:13px; margin:0;}
.tag{
  border:1px solid var(--border);
  background: rgba(255,255,255,.06);
  padding:6px 10px;
  border-radius:999px;
  font-size:12px;
  color:var(--muted);
  white-space:nowrap;
}

.opts{display:flex; flex-direction:column; gap:10px; margin-top:12px;}
.opt{
  border:1px solid var(--border);
  background: rgba(255,255,255,.04);
  border-radius:12px;
  padding:10px 12px;
  display:flex;
  align-items:flex-start;
  gap:10px;
  cursor:pointer;
  transition: transform .05s ease, border-color .2s ease, background .2s ease;
}
.opt:hover{transform: translateY(-1px); background: rgba(255,255,255,.06);}
.opt input{margin-top:3px;}
.opt .txt{line-height:1.35;}
.opt.selected{border-color: rgba(91,124,250,.55); background: rgba(91,124,250,.10);}
.opt.correct{border-color: rgba(45,212,191,.70); background: rgba(45,212,191,.10);}
.opt.wrong{border-color: rgba(251,113,133,.70); background: rgba(251,113,133,.10);}

.note{
  margin-top:12px;
  padding:10px 12px;
  border-radius:12px;
  border:1px solid var(--border);
  background: rgba(255,255,255,.04);
  color:var(--muted);
  font-size:13px;
}
.note strong{color:var(--text)}

.bar{
  margin-top:14px;
  display:flex;
  align-items:center;
  gap:10px;
}
.spacer{flex:1}
.btn{
  border:1px solid var(--border);
  background: rgba(91,124,250,.92);
  color:white;
  font-weight:800;
  padding:10px 12px;
  border-radius:12px;
  cursor:pointer;
}
.btn:hover{filter:brightness(1.05)}
.btn.ghost{
  background: rgba(255,255,255,.06);
  color: var(--text);
}
.btn.danger{
  background: rgba(251,113,133,.92);
}
.btn:disabled{
  opacity:.5;
  cursor:not-allowed;
}
.hidden{display:none}

.result{
  display:flex;
  flex-direction:column;
  gap:8px;
}
.big{
  font-size:18px;
  font-weight:900;
}
.small{color:var(--muted); font-size:13px;}