:root {
  --bg: #0b1220;
  --card: rgba(255, 255, 255, 0.06);
  --card2: rgba(255, 255, 255, 0.09);
  --text: rgba(255, 255, 255, 0.92);
  --muted: rgba(255, 255, 255, 0.70);
  --border: rgba(255, 255, 255, 0.12);
  --good: rgba(42, 212, 140, 0.18);
  --bad: rgba(255, 105, 105, 0.18);
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  background: radial-gradient(1200px 800px at 20% -10%, rgba(85, 102, 255, 0.25), transparent 60%),
              radial-gradient(900px 600px at 95% 15%, rgba(0, 200, 255, 0.18), transparent 55%),
              var(--bg);
  color: var(--text);
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 18px 10px;
  gap: 12px;
}

.brand { display: flex; align-items: center; gap: 12px; }
.logo {
  width: 42px;
  height: 42px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: var(--card);
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.title { font-weight: 700; letter-spacing: 0.2px; }
.subtitle { color: var(--muted); font-size: 13px; margin-top: 2px; }

.controls { display: flex; align-items: center; gap: 12px; }

.segmented {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 4px;
  display: flex;
  gap: 6px;
  box-shadow: var(--shadow);
}
.segmented-btn {
  border: 0;
  background: transparent;
  color: var(--muted);
  padding: 10px 12px;
  border-radius: 12px;
  cursor: pointer;
  font-weight: 600;
}
.segmented-btn.active {
  background: var(--card2);
  color: var(--text);
  border: 1px solid var(--border);
}

.container {
  max-width: 720px;
  margin: 10px auto 0;
  padding: 0 16px 40px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 22px;
  box-shadow: var(--shadow);
  padding: 18px;
}

.meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}
.pill {
  font-size: 13px;
  color: var(--muted);
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.04);
}
.ghost {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  padding: 8px 10px;
  border-radius: 12px;
  cursor: pointer;
  font-weight: 600;
}

.question {
  margin: 12px 0 14px;
  font-size: 22px;
  line-height: 1.25;
  letter-spacing: 0.2px;
}

.choices {
  display: grid;
  gap: 10px;
}

.choice-btn {
  width: 100%;
  text-align: left;
  padding: 14px 14px;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  cursor: pointer;
  font-size: 16px;
  line-height: 1.2;
  transition: transform 0.04s ease;
}
.choice-btn:active { transform: scale(0.99); }

.choice-btn.correct {
  background: var(--good);
  border-color: rgba(42, 212, 140, 0.45);
}
.choice-btn.wrong {
  background: var(--bad);
  border-color: rgba(255, 105, 105, 0.45);
}

.feedback {
  margin-top: 12px;
  min-height: 22px;
  color: var(--muted);
  font-weight: 600;
}

.actions {
  margin-top: 14px;
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  flex-wrap: wrap;
}

.primary, .secondary {
  border: 1px solid var(--border);
  padding: 12px 14px;
  border-radius: 16px;
  cursor: pointer;
  font-weight: 700;
}
.primary {
  background: rgba(255, 255, 255, 0.12);
  color: var(--text);
}
.secondary {
  background: transparent;
  color: var(--muted);
}

.footer {
  margin-top: 14px;
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

.answerTitle {
  margin-top: 10px;
  margin-bottom: 6px;
  color: rgba(255,255,255,0.85);
  font-weight: 800;
}

.answerList {
  margin: 6px 0 0 18px;
  color: rgba(255,255,255,0.85);
  line-height: 1.35;
}