:root {
  color-scheme: light dark;
  --bg: #0f1115;
  --card: #171a21;
  --text: #eceff4;
  --muted: #abb2bf;
  --primary: #6ea8fe;
  --danger: #ff6b6b;
  --border: #2b313d;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", sans-serif;
  background: radial-gradient(circle at top, #1b2030 0%, var(--bg) 45%);
  color: var(--text);
  line-height: 1.5;
}

.container {
  max-width: 760px;
  margin: 0 auto;
  padding: 24px 16px 40px;
}

.hero {
  margin-bottom: 18px;
}

.badge {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #c9d1d9;
  background: #2a2f3a;
  border: 1px solid #3a414f;
  border-radius: 999px;
  padding: 4px 10px;
}

.hero h1 {
  margin: 12px 0 6px;
  font-size: clamp(28px, 5vw, 38px);
}

.subtitle {
  margin: 0;
  color: var(--muted);
}

.card {
  background: linear-gradient(180deg, #1a1f29 0%, var(--card) 100%);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 18px;
  margin-top: 14px;
}

.hidden {
  display: none;
}

.quiz-head {
  margin-bottom: 12px;
}

.progress-track {
  width: 100%;
  height: 8px;
  background: #282d39;
  border-radius: 999px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  width: 0;
  background: linear-gradient(90deg, #5ca1ff, #9a7dff);
  transition: width 180ms ease;
}

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

.answer-btn {
  text-align: left;
  border: 1px solid #364053;
  background: #202633;
  color: var(--text);
  padding: 12px 14px;
  border-radius: 10px;
  cursor: pointer;
  transition: transform 120ms ease, border-color 120ms ease;
}

.answer-btn:hover {
  border-color: #7ea4f7;
  transform: translateY(-1px);
}

.btn {
  border: 1px solid #4b556a;
  border-radius: 10px;
  padding: 10px 14px;
  background: #2a3243;
  color: #eef2ff;
  cursor: pointer;
}

.btn.primary {
  background: linear-gradient(90deg, #5ca1ff, #7f73ff);
  border-color: transparent;
}

.btn.ghost {
  background: transparent;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.result-output h3 {
  margin-bottom: 4px;
}

.result-output p {
  margin-top: 0;
  color: #d8deea;
}

.ad-slot {
  border: 1px dashed #4e5f7d;
  border-radius: 12px;
  padding: 10px 12px;
  margin: 14px 0;
  background: #1a2231;
  color: #b8c4d9;
}

.unlock-output {
  margin-top: 12px;
  border: 1px solid #3d4658;
  border-radius: 12px;
  padding: 12px;
}