:root {
  --color-bg: #fbf7ff;
  --color-surface: #ffffff;
  --color-text: #2d2a3d;
  --color-text-muted: #756f8a;
  --color-primary: #6c5ce7;
  --color-primary-dark: #5341d6;
  --color-primary-light: #a29bfe;
  --color-accent: #ff7675;
  --color-border: #ece7f7;
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 8px;
  --shadow-card: 0 8px 24px rgba(108, 92, 231, 0.10);
  --shadow-glow: 0 14px 32px rgba(108, 92, 231, 0.28);
  --gradient-primary: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
  --max-width: 1120px;
  font-size: 16px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

a { color: inherit; text-decoration: none; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(251, 247, 255, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 2px 16px rgba(108, 92, 231, 0.06);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  height: 64px;
}

.logo {
  font-size: 1.25rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--color-primary-dark);
  white-space: nowrap;
}

.main-nav {
  display: flex;
  gap: 20px;
  flex: 1;
}

.main-nav a {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-text-muted);
  padding: 8px 4px;
  border-bottom: 2px solid transparent;
}

.main-nav a:hover {
  color: var(--color-primary);
  border-bottom-color: var(--color-primary);
}

.header-search input {
  width: 180px;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  font-size: 0.9rem;
  outline: none;
  transition: box-shadow .2s;
}

.header-search input:focus {
  box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.15);
  border-color: var(--color-primary);
}

.lang-switch {
  display: flex;
  gap: 2px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 3px;
  flex-shrink: 0;
}

.lang-switch__btn {
  border: none;
  background: transparent;
  padding: 5px 11px;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--color-text-muted);
  cursor: pointer;
  white-space: nowrap;
}

.lang-switch__btn:hover { color: var(--color-primary); }

.lang-switch__btn.is-active {
  background: var(--color-primary);
  color: #fff;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.4rem;
  cursor: pointer;
  color: var(--color-text);
}

/* ---------- Ad slots ----------
   目前用「招租中」的样式当占位视觉，方便评估广告版位对版面/体验的影响。
   之后要换成真实广告（如 AdSense），把 .ad-slot__content 换成广告联盟给的 <script>/<ins> 代码即可，
   外层的 .ad-slot 容器与尺寸可以保留。
*/
.ad-slot {
  position: relative;
  margin: 24px auto;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: linear-gradient(135deg, #ffdca8, #ffb56b);
  border: 1px solid rgba(255, 255, 255, 0.4);
  box-shadow: 0 8px 22px rgba(230, 145, 56, 0.28);
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.ad-slot__tag {
  position: absolute;
  top: 8px;
  left: 8px;
  background: rgba(0, 0, 0, 0.55);
  color: #fff;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: .05em;
  padding: 2px 8px;
  border-radius: 999px;
}

.ad-slot__content {
  display: flex;
  flex-direction: column;
  gap: 4px;
  color: #6b3d00;
  padding: 12px 20px;
  min-width: 0;
  max-width: 100%;
}

.ad-slot__content strong {
  font-size: 1.05rem;
  font-weight: 800;
}

.ad-slot__content span {
  font-size: 0.8rem;
  opacity: .85;
  overflow-wrap: break-word;
}

.ad-slot__icon {
  font-size: 1.8rem;
  margin-bottom: 2px;
}

.ad-slot--leaderboard {
  min-height: 90px;
  width: 100%;
  max-width: 728px;
}

.ad-slot--rectangle {
  min-height: 250px;
  width: 100%;
  max-width: 300px;
}

.ad-slot--infeed {
  min-height: 0;
  grid-column: span 1;
}

/* 混在测验卡片网格中的原生信息流广告：尺寸跟随卡片，颜色刻意区别于卡片本身 */
.quiz-card-ad {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 220px;
  padding: 28px 18px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  background: linear-gradient(135deg, #ffdca8, #ffb56b);
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: 64px 0 48px;
  text-align: center;
  overflow: hidden;
  isolation: isolate;
}

.hero::before,
.hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  border-radius: 50%;
  filter: blur(60px);
  pointer-events: none;
}

.hero::before {
  width: 420px;
  height: 420px;
  top: -180px;
  left: 50%;
  transform: translateX(-50%);
  background: radial-gradient(circle, rgba(108, 92, 231, 0.22), transparent 70%);
}

.hero::after {
  width: 320px;
  height: 320px;
  top: 20px;
  right: 8%;
  background: radial-gradient(circle, rgba(255, 118, 117, 0.16), transparent 70%);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  border-radius: 999px;
  background: rgba(108, 92, 231, 0.08);
  border: 1px solid rgba(108, 92, 231, 0.18);
  color: var(--color-primary-dark);
  font-size: 0.82rem;
  font-weight: 700;
  margin-bottom: 18px;
}

.hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.7rem);
  margin: 0 0 14px;
  background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary) 55%, #b09eff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero p {
  color: var(--color-text-muted);
  margin: 0 0 28px;
  font-size: 1.05rem;
}

.btn {
  display: inline-block;
  padding: 12px 32px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  box-shadow: var(--shadow-glow);
  transition: transform .15s, box-shadow .15s;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 36px rgba(108, 92, 231, 0.38);
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-primary-dark);
  border: 1.5px solid var(--color-border);
  transition: border-color .15s, color .15s, transform .15s;
}

.btn-secondary:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-2px);
}

/* ---------- Section shared ---------- */
.section-title {
  font-size: 1.4rem;
  margin: 0 0 18px;
  color: var(--color-text);
}

.featured, .categories, .quizzes {
  padding: 36px 0;
}

/* ---------- Featured card ---------- */
.featured-card {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 24px;
  align-items: center;
  background: linear-gradient(135deg, #6c5ce7, #a29bfe);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-glow);
  min-height: 140px;
  overflow: hidden;
  isolation: isolate;
}

.featured-card::before {
  content: "";
  position: absolute;
  z-index: -1;
  width: 260px;
  height: 260px;
  right: -60px;
  top: -80px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,255,255,0.28), transparent 70%);
  filter: blur(10px);
}

.featured-card .empty-hint {
  color: rgba(255,255,255,.85);
  margin: 0;
}

.featured-card__cover {
  width: 96px;
  height: 96px;
  border-radius: var(--radius-md);
  background: rgba(255,255,255,.2);
  border: 1px solid rgba(255,255,255,.35);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.2rem;
  box-shadow: 0 8px 20px rgba(0,0,0,.12);
}

.featured-card__body { flex: 1; min-width: 200px; }

.featured-card__body h3 { margin: 0 0 8px; font-size: 1.3rem; }
.featured-card__body p { margin: 0 0 14px; opacity: .9; }

.featured-card .btn-primary {
  background: #fff;
  color: var(--color-primary-dark);
}

/* ---------- Category pills ---------- */
.category-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.pill {
  padding: 8px 18px;
  border-radius: 999px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--color-text-muted);
  cursor: pointer;
  transition: all .15s;
}

.pill:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-1px);
}

.pill.is-active {
  background: var(--gradient-primary);
  border-color: transparent;
  color: #fff;
  box-shadow: 0 8px 18px rgba(108, 92, 231, 0.3);
}

/* ---------- Quiz grid ---------- */
.quizzes-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.quiz-count { color: var(--color-text-muted); font-size: 0.9rem; }

.quiz-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
  margin-top: 20px;
}

.quiz-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  border: 1px solid rgba(108, 92, 231, 0.06);
  display: flex;
  flex-direction: column;
  transition: transform .18s, box-shadow .18s;
  position: relative;
}

.quiz-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 16px 34px rgba(108, 92, 231, 0.22);
}

.quiz-card__cover {
  position: relative;
  height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.4rem;
  color: rgba(255,255,255,.9);
  overflow: hidden;
}

.quiz-card__cover::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 85% -10%, rgba(255,255,255,.35), transparent 55%),
    linear-gradient(to top, rgba(0,0,0,.12), transparent 45%);
}

.quiz-card__badge {
  position: absolute;
  top: 10px;
  right: 10px;
  background: rgba(0,0,0,.45);
  color: #fff;
  font-size: 0.72rem;
  padding: 3px 10px;
  border-radius: 999px;
  font-weight: 600;
}

.quiz-card__body {
  padding: 16px 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.quiz-card__category {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  align-self: flex-start;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--color-primary-dark);
  background: rgba(108, 92, 231, 0.09);
  padding: 3px 10px 3px 8px;
  border-radius: 999px;
  letter-spacing: .02em;
}

.quiz-card__category::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
  flex-shrink: 0;
}

.quiz-card__title {
  font-size: 1.05rem;
  font-weight: 700;
  margin: 0;
}

.quiz-card__desc {
  font-size: 0.88rem;
  color: var(--color-text-muted);
  margin: 0;
  flex: 1;
}

.quiz-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 4px;
}

.quiz-card__tags span {
  font-size: 0.72rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  padding: 2px 9px;
  border-radius: 999px;
}

.empty-state {
  text-align: center;
  color: var(--color-text-muted);
  padding: 40px 0;
}

/* ---------- Footer ---------- */
.site-footer {
  position: relative;
  background: linear-gradient(180deg, #262238, #201c30);
  color: #cfc9e6;
  padding: 40px 0 20px;
  margin-top: 20px;
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: -140px;
  left: 50%;
  transform: translateX(-50%);
  width: 480px;
  height: 280px;
  background: radial-gradient(circle, rgba(108, 92, 231, 0.25), transparent 70%);
  filter: blur(20px);
  pointer-events: none;
}

.footer-inner, .copyright { position: relative; }

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 32px;
  align-items: flex-start;
  justify-content: space-between;
}

.footer-about { max-width: 340px; }
.footer-about h3 { color: #fff; margin: 0 0 8px; }

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.9rem;
}

.footer-links a:hover { color: #fff; }

.site-footer .ad-slot {
  border-color: #443d64;
  background: #2f2a45;
  color: #8a83ad;
}

.copyright {
  text-align: center;
  font-size: 0.78rem;
  color: #8a83ad;
  margin: 32px 0 0;
}

.last-updated {
  text-align: center;
  font-size: 0.78rem;
  color: #6b6489;
  margin: 32px 0 0;
}

.last-updated + .copyright { margin-top: 6px; }

/* 每題一個網址的測驗共用：已作答選項的還原樣式 + 上一題按鈕，跟各測驗自訂的主題色無關，
   所以統一放在共用樣式表裡，用半透明色調避免跟不同測驗各自的主題色衝突。 */
.quiz-option.is-selected {
  border-color: var(--color-primary);
  border-width: 2px;
  background: rgba(108, 92, 231, 0.07);
  font-weight: 700;
}

.quiz-back-btn {
  margin-top: 4px;
  align-self: flex-start;
}

.quiz-back-hint {
  font-size: 0.78rem;
  color: var(--color-text-muted);
  opacity: .8;
  margin: 6px 0 0;
  line-height: 1.6;
}

/* ---------- 首次進站歡迎彈窗（詢問年齡／慣用語言） ---------- */
.welcome-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(30, 24, 54, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 1000;
}

.welcome-modal-overlay[hidden] { display: none; }

.welcome-modal {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  padding: 28px 24px;
  max-width: 400px;
  width: 100%;
  max-height: calc(100vh - 40px);
  overflow-y: auto;
}

.welcome-modal h2 {
  margin: 0 0 10px;
  font-size: 1.3rem;
}

.welcome-modal > p {
  margin: 0 0 20px;
  color: var(--color-text-muted);
  font-size: 0.9rem;
  line-height: 1.7;
}

.welcome-modal__field {
  display: block;
  margin-bottom: 16px;
}

.welcome-modal__field > span {
  display: block;
  font-weight: 700;
  font-size: 0.88rem;
  margin-bottom: 6px;
}

.welcome-modal__field input,
.welcome-modal__field select {
  width: 100%;
  min-width: 0;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--color-border);
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 1rem;
  font-family: inherit;
}

.welcome-modal__field input:focus,
.welcome-modal__field select:focus {
  outline: none;
  border-color: var(--color-primary);
}

.welcome-modal__actions {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 8px;
}

.welcome-modal__actions .btn { width: 100%; }

/* ---------- Responsive ---------- */
@media (max-width: 720px) {
  .container { padding: 0 16px; }

  .main-nav { display: none; }
  .header-search { display: none; }
  .nav-toggle { display: block; }
  .header-inner { gap: 10px; }
  .logo { font-size: 1.1rem; }

  .site-header.is-open .main-nav {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-surface);
    padding: 16px 20px;
    border-bottom: 1px solid var(--color-border);
    gap: 12px;
  }
}

/* 超窄螢幕（如 iPhone SE、部分舊 Android，320px 上下）：
   語言切換鈕再收斂一點，logo 只留 emoji，避免 header 被擠出換行或橫向溢出 */
@media (max-width: 360px) {
  .logo span { display: none; }
  .lang-switch__btn { padding: 4px 8px; font-size: 0.7rem; }
}