/* ===== Keyframe Animations ===== */

@keyframes btnBounce {
  0%   { transform: scale(1); }
  28%  { transform: scale(1.22); }
  52%  { transform: scale(0.9); }
  72%  { transform: scale(1.1); }
  88%  { transform: scale(0.97); }
  100% { transform: scale(1); }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  18%       { transform: translateX(-9px); }
  36%       { transform: translateX(9px); }
  54%       { transform: translateX(-6px); }
  72%       { transform: translateX(6px); }
  88%       { transform: translateX(-3px); }
}

@keyframes confettiFall {
  0%   { transform: translateY(-10px) rotate(0deg); opacity: 1; }
  100% { transform: translateY(100vh) rotate(700deg); opacity: 0; }
}

/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --main: #4FC3F7;
  --main-dark: #0288D1;
  --accent: #FF7043;
  --accent-dark: #E64A19;
  --bg: #FFF9E6;
  --card-bg: #FFFFFF;
  --text: #333333;
  --text-light: #666666;
  --border: #E0E0E0;
  --correct: #66BB6A;
  --wrong: #EF5350;
  --radius: 12px;
  --shadow: 0 2px 8px rgba(0,0,0,0.1);
}

html { font-size: 16px; }

body {
  font-family: 'Nunito', 'Hiragino Kaku Gothic ProN', 'Meiryo', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a { color: var(--main-dark); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ===== Header ===== */
.site-header {
  background: linear-gradient(135deg, #4FC3F7 0%, #81D4FA 100%);
  padding: 0 1rem;
  height: 60px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.15);
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
}

.header-inner {
  max-width: 960px;
  width: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-logo {
  font-size: 1.3rem;
  font-weight: 800;
  color: #fff;
  text-decoration: none;
}
.site-logo span { font-size: 0.9rem; font-weight: 600; opacity: 0.85; }

.site-nav { display: flex; gap: 0.75rem; }
.site-nav a {
  color: #fff;
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.25rem 0.5rem;
  border-radius: 6px;
  transition: background 0.2s;
}
.site-nav a:hover { background: rgba(255,255,255,0.2); text-decoration: none; }

/* ===== Main ===== */
.main-content {
  max-width: 960px;
  margin: 0 auto;
  padding: 1.5rem 1rem;
  flex: 1;
  width: 100%;
}

/* ===== AdSense placeholder ===== */
.adsense-placeholder {
  max-width: 960px;
  margin: 0 auto;
  padding: 0.5rem 1rem;
  text-align: center;
  min-height: 0;
}

/* ===== Footer ===== */
.site-footer {
  background: #37474F;
  color: #CFD8DC;
  padding: 1.5rem 1rem;
  margin-top: 2rem;
}
.footer-inner {
  max-width: 960px;
  margin: 0 auto;
}
.footer-inner p { margin-bottom: 0.75rem; font-size: 0.85rem; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.footer-nav a {
  color: #90A4AE;
  font-size: 0.85rem;
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  transition: color 0.2s;
}
.footer-nav a:hover { color: #fff; text-decoration: none; }

/* ===== Buttons ===== */
.btn-primary {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
  padding: 0.6rem 1.4rem;
  border-radius: 50px;
  border: none;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  text-decoration: none;
}
.btn-primary:hover  { background: var(--accent-dark); text-decoration: none; transform: translateY(-1px); }
.btn-primary:active { transform: scale(0.94) translateY(1px); transition-duration: 0.08s; }
.btn-primary.large { font-size: 1.2rem; padding: 0.8rem 2rem; }

.btn-secondary {
  display: inline-block;
  background: #fff;
  color: var(--main-dark);
  font-weight: 700;
  font-size: 1rem;
  padding: 0.6rem 1.4rem;
  border-radius: 50px;
  border: 2px solid var(--main);
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s;
}
.btn-secondary:hover { background: #E3F2FD; text-decoration: none; }

.speak-btn {
  background: var(--main);
  color: #fff;
  border: none;
  border-radius: 50px;
  padding: 0.4rem 1rem;
  font-size: 0.9rem;
  font-weight: 700;
  cursor: pointer;
  transition: background 0.2s;
}
.speak-btn:hover { background: var(--main-dark); }
.speak-btn.small { font-size: 0.8rem; padding: 0.3rem 0.8rem; }

/* ===== Hero ===== */
.hero {
  text-align: center;
  padding: 2.5rem 1rem 2rem;
}
.hero h1 {
  font-size: 2rem;
  font-weight: 800;
  color: var(--main-dark);
  margin-bottom: 0.5rem;
}
.hero-text { font-size: 1.1rem; color: var(--text-light); margin-bottom: 0.75rem; }
.word-count {
  display: inline-block;
  background: var(--main);
  color: #fff;
  padding: 0.3rem 1rem;
  border-radius: 50px;
  font-weight: 700;
}

/* ===== Category Grid ===== */
.categories-section { margin-bottom: 2rem; }
.categories-section h2, .recent-words h2 {
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 1rem;
  padding-left: 0.5rem;
  border-left: 4px solid var(--accent);
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 0.75rem;
}

.category-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1rem 0.75rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
  text-decoration: none;
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.2s, border-color 0.2s;
  border: 2px solid transparent;
}
.category-card:hover {
  transform: translateY(-5px) scale(1.03);
  box-shadow: 0 8px 20px rgba(0,0,0,0.15);
  border-color: var(--main);
  text-decoration: none;
}
.category-card:active { transform: scale(0.95); transition-duration: 0.08s; }
.cat-emoji { font-size: 2rem; }
.cat-name { font-weight: 700; font-size: 0.9rem; color: var(--text); }
.cat-count { font-size: 0.75rem; color: var(--text-light); }

/* ===== Word Cards ===== */
.word-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 0.6rem;
}

.word-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 0.75rem 0.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
  text-decoration: none;
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.2s, border-color 0.2s;
  border: 2px solid transparent;
}
.word-card:hover {
  transform: translateY(-4px) scale(1.04);
  box-shadow: 0 6px 16px rgba(0,0,0,0.15);
  border-color: var(--main);
  text-decoration: none;
}
.word-card:active { transform: scale(0.94); transition-duration: 0.08s; }
.word-card.small { padding: 0.5rem; }
.word-emoji { font-size: 1.5rem; }
.word-en { font-weight: 700; font-size: 0.85rem; color: var(--text); }
.word-ja { font-size: 0.75rem; color: var(--text-light); }

/* ===== Word Detail ===== */
.word-detail { max-width: 700px; margin: 0 auto; }

.word-header {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
  padding: 1.5rem;
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.word-emoji-large { font-size: 4rem; }
.word-en-title { font-size: 2.5rem; font-weight: 800; color: var(--main-dark); }
.word-phonetic { font-size: 1rem; color: var(--text-light); margin-bottom: 0.5rem; }

.word-info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}
.info-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 0.75rem 1rem;
}
.info-card dt { font-size: 0.75rem; color: var(--text-light); margin-bottom: 0.2rem; }
.info-card dd { font-weight: 700; font-size: 1rem; }
.word-ja-large { font-size: 1.2rem; }

.description-block, .example-block, .related-words, .mini-quiz-block {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.25rem;
  margin-bottom: 1rem;
}
.description-block h2, .example-block h2, .related-words h2, .mini-quiz-block h2 {
  font-size: 1rem;
  font-weight: 800;
  color: var(--main-dark);
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--main);
}

.example-en { font-size: 1.1rem; font-weight: 700; margin-bottom: 0.25rem; }
.example-ja { color: var(--text-light); margin-bottom: 0.75rem; }

/* ===== Quiz choices ===== */
.quiz-choices { display: flex; flex-direction: column; gap: 0.5rem; margin-top: 0.75rem; }

.choice-btn {
  background: #fff;
  border: 2px solid var(--border);
  border-radius: 50px;
  padding: 0.6rem 1rem;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
  transition: border-color 0.2s, background 0.2s;
  font-family: inherit;
}
.choice-btn:hover:not(:disabled) { border-color: var(--main); background: #E3F2FD; }
.choice-btn:active:not(:disabled) { transform: scale(0.95); transition-duration: 0.08s; }
.choice-btn.correct {
  background: #E8F5E9;
  border-color: var(--correct);
  color: #2E7D32;
  animation: btnBounce 0.55s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}
.choice-btn.wrong {
  background: #FFEBEE;
  border-color: var(--wrong);
  color: #C62828;
  animation: shake 0.45s ease forwards;
}
.choice-btn:disabled { cursor: default; }

.quiz-result { margin-top: 0.75rem; font-weight: 700; font-size: 1rem; }
.quiz-result.correct { color: var(--correct); }
.quiz-result.wrong { color: var(--wrong); }

.category-quiz-link { text-align: center; margin-top: 1.5rem; }

/* ===== Category page ===== */
.category-hero {
  text-align: center;
  padding: 2rem 1rem 1.5rem;
}
.cat-emoji-large { font-size: 3.5rem; display: block; margin-bottom: 0.5rem; }
.category-hero h1 { font-size: 1.8rem; font-weight: 800; color: var(--main-dark); }
.category-actions { text-align: center; margin-bottom: 1.5rem; }

.category-word-list { grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); }
.category-word-list .word-card { flex-direction: row; align-items: center; gap: 0.75rem; }
.word-text { display: flex; flex-direction: column; flex: 1; }
.word-level {
  font-size: 0.7rem;
  background: var(--main);
  color: #fff;
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  white-space: nowrap;
}

/* ===== Quiz page ===== */
.quiz-header {
  text-align: center;
  padding: 1.5rem 1rem 1rem;
}
.quiz-header h1 { font-size: 1.8rem; font-weight: 800; color: var(--main-dark); }

.quiz-app { max-width: 600px; margin: 0 auto; }
.quiz-start { text-align: center; padding: 2rem; }
.start-text { font-size: 1.1rem; margin-bottom: 1.5rem; line-height: 1.8; }

.count-select {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.count-btn {
  background: var(--main);
  color: #fff;
  border: none;
  border-radius: 50px;
  padding: 0.9rem 2.2rem;
  min-height: 52px;
  font-size: 1.2rem;
  font-weight: 700;
  cursor: pointer;
  font-family: inherit;
  transition: background 0.2s, transform 0.1s;
  touch-action: manipulation;
}
.count-btn:hover { background: var(--main-dark); transform: translateY(-2px); }

.count-note {
  font-size: 0.85rem;
  color: var(--text-light);
  margin-top: 0.25rem;
}

.quiz-progress {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0;
  word-spacing: 0;
}
.progress-count {
  letter-spacing: 0;
  word-spacing: 0;
}
.score-display { color: var(--accent); }

.quiz-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  margin-bottom: 1rem;
}
.quiz-word-display {
  text-align: center;
  margin-bottom: 1rem;
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
}

.quiz-speak-btn {
  font-size: 1.4rem;
  padding: 0.3rem 0.6rem;
  flex-shrink: 0;
}
.quiz-word-en { font-size: 2.5rem; font-weight: 800; color: var(--main-dark); }
.quiz-question-text { text-align: center; font-weight: 600; margin-bottom: 0.5rem; color: var(--text-light); }

.quiz-feedback { margin-top: 0.75rem; font-weight: 700; font-size: 1rem; text-align: center; min-height: 1.5rem; }
.quiz-feedback.correct { color: var(--correct); }
.quiz-feedback.wrong { color: var(--wrong); }

.quiz-result-screen {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 2rem;
  text-align: center;
}
.quiz-result-screen h2 { font-size: 1.8rem; font-weight: 800; color: var(--main-dark); margin-bottom: 1rem; }
.final-score { font-size: 2rem; font-weight: 800; color: var(--accent); margin-bottom: 0.5rem; }
.bonus-msg { font-size: 1.1rem; color: var(--correct); font-weight: 700; margin-bottom: 1rem; }
.result-actions { display: flex; gap: 0.75rem; justify-content: center; flex-wrap: wrap; }

/* ===== Index: grade & eiken sections ===== */
.grade-section,
.eiken-section {
  margin-bottom: 2.5rem;
}
.grade-section h2,
.eiken-section h2 {
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 1rem;
  padding-left: 0.5rem;
  border-left: 4px solid var(--main);
}

/* ---- Grade grid ---- */
.grade-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 0.75rem;
}

.grade-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 96px;
  padding: 14px 8px;
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.09);
  border: 2px solid #E0E0E0;
  border-top-width: 5px;
  text-decoration: none;
  touch-action: manipulation;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.grade-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 22px rgba(0,0,0,0.14);
  text-decoration: none;
}
.grade-card:active {
  transform: scale(0.95);
  transition-duration: 0.08s;
}

/* 学年ごとのアクセントカラー */
.grade-card.g1 { border-top-color: #66BB6A; }
.grade-card.g2 { border-top-color: #FFA726; }
.grade-card.g3 { border-top-color: #42A5F5; }
.grade-card.g4 { border-top-color: #EF5350; }
.grade-card.g5 { border-top-color: #26A69A; }
.grade-card.g6 { border-top-color: #7E57C2; }

.gc-emoji { font-size: 1.8rem; line-height: 1; }
.gc-name {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: 0;
  white-space: nowrap;
}

/* ---- Eiken grid ---- */
.eiken-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

.eiken-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 110px;
  padding: 20px 12px;
  border-radius: 16px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.09);
  border-width: 2px;
  border-style: solid;
  text-decoration: none;
  touch-action: manipulation;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.eiken-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 24px rgba(0,0,0,0.14);
  text-decoration: none;
}
.eiken-card:active {
  transform: scale(0.95);
  transition-duration: 0.08s;
}

/* 5級：緑 */
.eiken-card.ek5 { background: #E8F5E9; border-color: #66BB6A; }
.eiken-card.ek5 .ec-num { color: #2E7D32; }

/* 4級：青 */
.eiken-card.ek4 { background: #E3F2FD; border-color: #42A5F5; }
.eiken-card.ek4 .ec-num { color: #1565C0; }

/* 3級：オレンジ */
.eiken-card.ek3 { background: #FFF3E0; border-color: #FFA726; }
.eiken-card.ek3 .ec-num { color: #E65100; }

.ec-num {
  font-size: 1.8rem;
  font-weight: 900;
  letter-spacing: 0;
  white-space: nowrap;
  line-height: 1;
}
.ec-desc {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-light);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}

/* Responsive */
@media (max-width: 600px) {
  .grade-grid { grid-template-columns: repeat(3, 1fr); gap: 0.5rem; }
  .gc-emoji { font-size: 1.5rem; }
  .gc-name  { font-size: 15px; }
  .grade-card { min-height: 80px; padding: 10px 6px; }
  .eiken-grid { gap: 0.5rem; }
  .eiken-card { min-height: 88px; padding: 14px 8px; }
  .ec-num  { font-size: 1.4rem; }
  .ec-desc { font-size: 0.72rem; }
}

/* ===== Grade / Eiken pages ===== */
.grade-hero, .eiken-hero {
  text-align: center;
  padding: 1.5rem 1rem 1rem;
}
.grade-hero h1, .eiken-hero h1 {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--main-dark);
  margin-bottom: 0.25rem;
}
.grade-hero p, .eiken-hero p { color: var(--text-light); margin-bottom: 0; }

.grade-badge {
  display: inline-block;
  background: var(--main);
  color: #fff;
  font-weight: 800;
  font-size: 1rem;
  padding: 0.3rem 1rem;
  border-radius: 50px;
  margin-bottom: 0.5rem;
}

.eiken-badge-large {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  font-weight: 800;
  font-size: 1.1rem;
  padding: 0.35rem 1.2rem;
  border-radius: 50px;
  margin-bottom: 0.5rem;
}

.eiken-badge {
  font-size: 0.7rem;
  background: var(--accent);
  color: #fff;
  padding: 0.1rem 0.4rem;
  border-radius: 4px;
  white-space: nowrap;
}

.grade-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin: 1rem 0 1.5rem;
}

.grade-nav-btn {
  padding: 0.4rem 0.9rem;
  border-radius: 50px;
  background: #fff;
  border: 2px solid var(--main);
  color: var(--main-dark);
  font-weight: 700;
  font-size: 0.85rem;
  text-decoration: none;
  transition: background 0.2s, color 0.2s;
}
.grade-nav-btn:hover, .grade-nav-btn.active {
  background: var(--main);
  color: #fff;
  text-decoration: none;
}

/* ===== Confetti ===== */
.confetti-piece {
  position: absolute;
  top: -12px;
  pointer-events: none;
  animation: confettiFall linear forwards;
}

/* ===== Daily Quiz (index) ===== */
.daily-quiz-section {
  margin-bottom: 2.5rem;
}
.daily-quiz-section > h2 {
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 1rem;
  padding-left: 0.5rem;
  border-left: 4px solid var(--main);
}
.daily-quiz-app {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  max-width: 600px;
  margin: 0 auto;
}
.dq-start {
  text-align: center;
  padding: 1.5rem 0;
}
.dq-start-text {
  font-size: 1.05rem;
  margin-bottom: 1.5rem;
  color: var(--text);
}
.dq-start-btn {
  font-size: 1.15rem;
  padding: 0.9rem 2.5rem;
}
.dq-main { }

/* ===== Quiz List (index) ===== */
.quiz-list-section {
  margin-bottom: 2.5rem;
}
.quiz-list-section > h2 {
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 1rem;
  padding-left: 0.5rem;
  border-left: 4px solid var(--accent);
}
.quiz-list-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.6rem;
}
.quiz-list-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  padding: 10px 6px;
  background: #fff;
  border-radius: 12px;
  border: 2px solid #E0E0E0;
  box-shadow: 0 1px 4px rgba(0,0,0,0.07);
  text-decoration: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease, border-color 0.15s ease;
  touch-action: manipulation;
}
.quiz-list-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 14px rgba(0,0,0,0.12);
  border-color: var(--accent);
  text-decoration: none;
}
.quiz-list-card:active {
  transform: scale(0.95);
}
.qlc-emoji { font-size: 1.4rem; line-height: 1; }
.qlc-name {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text);
  text-align: center;
  line-height: 1.3;
  word-break: break-all;
}
.qlc-cta {
  background: var(--accent);
  color: #fff;
  font-size: 0.62rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 20px;
  white-space: nowrap;
}

/* ===== Content Pages (About, Contact, Sitemap etc.) ===== */
.content-container {
  max-width: 760px;
  margin: 0 auto;
}
.content-hero {
  text-align: center;
  padding: 2rem 1rem 1.5rem;
}
.content-hero h1 {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--main-dark);
}
.content-section {
  background: var(--card-bg);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  margin-bottom: 1rem;
}
.content-section h2 {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--main-dark);
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--main);
}
.content-section p {
  margin-bottom: 0.75rem;
  line-height: 1.8;
  font-size: 0.95rem;
}
.content-section p:last-child {
  margin-bottom: 0;
}
.content-section ul {
  margin: 0.5rem 0 0.75rem 1.5rem;
  line-height: 1.8;
  font-size: 0.95rem;
}
.content-section ul li {
  margin-bottom: 0.3rem;
}
.content-section a.contact-btn {
  display: inline-block;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  font-size: 1rem;
  padding: 0.7rem 1.6rem;
  border-radius: 50px;
  text-decoration: none;
  transition: background 0.2s, transform 0.1s;
}
.content-section a.contact-btn:hover {
  background: var(--accent-dark);
  text-decoration: none;
  transform: translateY(-1px);
}
.update-date {
  text-align: center;
  color: var(--text-light);
  font-size: 0.85rem;
  margin-top: 1.5rem;
}

/* ===== Hamburger Menu ===== */
.hamburger-btn {
  display: none;
  background: none;
  border: none;
  color: #fff;
  font-size: 1.6rem;
  cursor: pointer;
  padding: 0.25rem;
  line-height: 1;
  -webkit-tap-highlight-color: transparent;
}

/* ===== Sitemap Page ===== */
.sitemap-group {
  margin-bottom: 1.5rem;
}
.sitemap-group h2 {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--main-dark);
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--main);
}
.sitemap-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.sitemap-links a {
  display: inline-block;
  background: var(--card-bg);
  border: 2px solid var(--border);
  border-radius: 8px;
  padding: 0.4rem 0.8rem;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  transition: border-color 0.2s, background 0.2s;
}
.sitemap-links a:hover {
  border-color: var(--main);
  background: #E3F2FD;
  text-decoration: none;
}

/* ===== Footer Sections ===== */
.footer-section-title {
  color: #90A4AE;
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
  margin-top: 1rem;
}

/* ===== Responsive ===== */
@media (max-width: 600px) {
  .hero h1 { font-size: 1.5rem; }
  .word-en-title { font-size: 1.8rem; }
  .word-header { flex-direction: column; text-align: center; gap: 0.75rem; }
  .category-grid { grid-template-columns: repeat(auto-fill, minmax(100px, 1fr)); }
  .quiz-list-grid { grid-template-columns: repeat(3, 1fr); gap: 0.5rem; }
  .qlc-emoji { font-size: 1.2rem; }
  .qlc-name { font-size: 0.68rem; }
  .qlc-cta { font-size: 0.58rem; padding: 2px 6px; }

  /* Hamburger menu */
  .hamburger-btn {
    display: block;
  }
  .site-nav {
    display: none;
    position: absolute;
    top: 60px;
    right: 0;
    left: 0;
    background: linear-gradient(135deg, #4FC3F7 0%, #81D4FA 100%);
    flex-direction: column;
    padding: 0.5rem 1rem 1rem;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
    gap: 0;
    z-index: 99;
  }
  .site-nav.open {
    display: flex;
  }
  .site-nav a {
    padding: 0.6rem 0.75rem;
    font-size: 1rem;
    border-bottom: 1px solid rgba(255,255,255,0.15);
  }
  .site-nav a:last-child {
    border-bottom: none;
  }
}