/* ============================================================
   reader.css — speed-reader スタイルシート
   テーマ: 温かみのある「紙」ライク読書体験
   タブレット対応・低スペック向け軽量CSS
   ============================================================ */

/* ── CSS変数（app.jsからも上書き可） ──────────────────── */
:root {
  --color-primary:   #2d4a8a;
  --color-primary-lt:#e8edf8;
  --color-bg:        #f8f6f1;
  --color-surface:   #ffffff;
  --color-border:    #e2ddd6;
  --color-text:      #1c1917;
  --color-text-sub:  #78716c;
  --color-correct:   #16a34a;
  --color-wrong:     #dc2626;
  --radius-card:     12px;
  --padding-base:    24px;
  --text-scale:      1;
  --shadow-card:     0 2px 8px rgba(0,0,0,0.08), 0 0 0 1px var(--color-border);
  --transition:      0.18s ease;
  /* フォント設定（admin-tool → config → applyTheme で上書きされる） */
  --font-reading:    'Noto Serif JP', 'Yu Mincho', 'YuMincho', '游明朝', serif;
  --font-size-reading: 1.45rem;
}

/* ── リセット ─────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-text-size-adjust: 100%; }
body {
  font-family: 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', 'Meiryo', sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
}

/* ── レイアウト ───────────────────────────────────────── */
#app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ── ヘッダー ─────────────────────────────────────────── */
#app-header {
  background: var(--color-surface);
  border-bottom: 2px solid var(--color-primary);
  padding: 0 var(--padding-base);
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 4px rgba(0,0,0,0.06);
}

#header-title {
  font-size: calc(1.15rem * var(--text-scale));
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.03em;
}

.header-nav {
  display: flex;
  gap: 8px;
}

.nav-btn {
  padding: 8px 14px;
  border: 1.5px solid var(--color-border);
  border-radius: 20px;
  background: transparent;
  font-size: 0.85rem;
  cursor: pointer;
  color: var(--color-text-sub);
  transition: var(--transition);
  min-height: 36px;
  min-width: 64px;
  -webkit-tap-highlight-color: transparent;
}
.nav-btn:hover, .nav-btn:active {
  background: var(--color-primary-lt);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.pwa-update-notice {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 10px var(--padding-base);
  background: var(--color-primary-lt);
  border-bottom: 1px solid var(--color-primary);
  color: var(--color-primary);
  font-size: 0.88rem;
  font-weight: 700;
}

.pwa-update-notice[hidden] { display: none; }

.btn-inline-update {
  flex-shrink: 0;
  border: 1px solid var(--color-primary);
  border-radius: 999px;
  background: var(--color-primary);
  color: #ffffff;
  padding: 5px 13px;
  cursor: pointer;
  font: inherit;
  font-size: 0.8rem;
}

.btn-inline-update:hover { filter: brightness(1.12); }

/* ── スクリーン管理 ───────────────────────────────────── */
.screen {
  display: none;
  flex: 1;
  padding: var(--padding-base);
  max-width: 800px;
  margin: 0 auto;
  width: 100%;
}
.screen.active { display: block; }

/* ── ホーム画面 ───────────────────────────────────────── */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--color-surface);
  border-radius: var(--radius-card);
  padding: 16px 12px;
  text-align: center;
  box-shadow: var(--shadow-card);
}

.stat-value {
  font-size: calc(1.6rem * var(--text-scale));
  font-weight: 700;
  color: var(--color-primary);
  display: block;
  line-height: 1.2;
}

.stat-label {
  font-size: 0.75rem;
  color: var(--color-text-sub);
  margin-top: 4px;
}

.section-title {
  font-size: calc(1rem * var(--text-scale));
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 14px;
  padding-left: 10px;
  border-left: 3px solid var(--color-primary);
}

/* ── 教材カード ───────────────────────────────────────── */
#material-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.material-filter {
  margin-bottom: 16px;
  padding: 12px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-card);
  background: var(--color-surface);
}
.material-filter-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 10px;
}
.material-filter-label {
  color: var(--color-text-sub);
  font-size: 0.82rem;
  font-weight: 700;
}
.material-count {
  color: var(--color-text-sub);
  font-size: 0.78rem;
}
.difficulty-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.difficulty-filter-btn {
  min-height: 40px;
  padding: 7px 14px;
  border: 1px solid var(--color-border);
  border-radius: 999px;
  color: var(--color-text-sub);
  background: var(--color-bg);
  font: inherit;
  font-size: 0.85rem;
  font-weight: 700;
  cursor: pointer;
  transition: var(--transition);
}
.difficulty-filter-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.difficulty-filter-btn.active {
  border-color: var(--color-primary);
  background: var(--color-primary);
  color: #fff;
}

.published-bundle-notice {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
  padding: 10px 14px;
  border: 1px solid #f59e0b;
  border-radius: var(--radius-card);
  background: #fffbeb;
  color: #92400e;
  font-size: 0.85rem;
}

.published-bundle-notice[hidden] { display: none; }

.published-bundle-at {
  display: block;
  margin-top: 2px;
  color: #a16207;
  font-size: 0.74rem;
}

.btn-inline-reset {
  flex-shrink: 0;
  border: 1px solid #f59e0b;
  border-radius: 999px;
  background: #ffffff;
  color: #92400e;
  padding: 5px 10px;
  cursor: pointer;
  font-size: 0.78rem;
  font-weight: 700;
}

.btn-inline-reset:hover { background: #fef3c7; }

@media (max-width: 600px) {
  .pwa-update-notice {
    justify-content: space-between;
  }

  .published-bundle-notice {
    flex-direction: column;
    align-items: flex-start;
  }
}

.material-card {
  background: var(--color-surface);
  border-radius: var(--radius-card);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow-card);
  transition: var(--transition);
  gap: 16px;
}
.material-card:hover {
  box-shadow: 0 4px 16px rgba(45,74,138,0.15), 0 0 0 1px var(--color-primary);
}

.mat-info { flex: 1; }
.mat-difficulty {
  font-size: 0.85rem;
  color: #d97706;
  display: block;
  margin-bottom: 4px;
}
.mat-title {
  font-size: calc(1.05rem * var(--text-scale));
  font-weight: 600;
  margin-bottom: 4px;
}
.mat-qcount {
  font-size: 0.8rem;
  color: var(--color-text-sub);
}

/* ── 共通ボタン ───────────────────────────────────────── */
.btn-start, .btn-primary {
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 12px 22px;
  font-size: calc(0.95rem * var(--text-scale));
  font-weight: 600;
  cursor: pointer;
  min-height: 48px;
  min-width: 80px;
  transition: var(--transition);
  -webkit-tap-highlight-color: transparent;
  white-space: nowrap;
}
.btn-start:hover, .btn-primary:hover {
  filter: brightness(1.12);
}
.btn-start:active, .btn-primary:active {
  transform: scale(0.97);
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
  border-radius: 8px;
  padding: 12px 22px;
  font-size: calc(0.95rem * var(--text-scale));
  font-weight: 600;
  cursor: pointer;
  min-height: 48px;
  min-width: 80px;
  transition: var(--transition);
  -webkit-tap-highlight-color: transparent;
}
.btn-secondary:hover { background: var(--color-primary-lt); }

.btn-danger {
  background: #fee2e2;
  color: var(--color-wrong);
  border: none;
  border-radius: 8px;
  padding: 10px 18px;
  font-size: 0.9rem;
  cursor: pointer;
  min-height: 44px;
  transition: var(--transition);
}
.btn-danger:hover { background: #fecaca; }

.empty-msg {
  text-align: center;
  color: var(--color-text-sub);
  padding: 40px 20px;
  font-size: 0.95rem;
  line-height: 1.8;
}

/* ── 速読画面 ─────────────────────────────────────────── */
#screen-reading {
  display: none;
  flex-direction: column;
  padding: 0;
  max-width: 100%;
}
#screen-reading.active {
  display: flex;
}

/* プログレスバー */
.progress-wrapper {
  background: var(--color-border);
  height: 4px;
  width: 100%;
}
#reading-bar {
  height: 4px;
  background: var(--color-primary);
  width: 0%;
  transition: width 0.3s ease;
}

/* 進捗テキスト */
#reading-progress {
  text-align: center;
  font-size: 0.85rem;
  color: var(--color-text-sub);
  padding: 12px var(--padding-base) 6px;
  background: var(--color-surface);
}

/* メイン読書エリア */
#reading-main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface);
  min-height: 260px;
  padding: 32px var(--padding-base);
  position: relative;
}

/* 前/後ろの大きいタップゾーン */
.tap-zone {
  position: absolute;
  top: 0; bottom: 0;
  width: 38%;
  background: transparent;
  cursor: pointer;
  display: flex;
  align-items: center;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
  /* タップ時のみリップル表示 */
  transition: background 0.12s;
}
.tap-zone:active {
  background: rgba(45, 74, 138, 0.07);
}

/* タップ矢印ヒント（常時ごく薄く表示、タップ時に濃く） */
.tap-zone::after {
  content: attr(data-arrow);
  font-size: 1.6rem;
  color: var(--color-primary);
  opacity: 0.10;
  transition: opacity 0.15s;
  pointer-events: none;
}
.tap-zone:active::after { opacity: 0.45; }

#tap-prev { left: 0;  justify-content: flex-start; padding-left: 14px; }
#tap-next { right: 0; justify-content: flex-end;   padding-right: 14px; }

#reading-sentence {
  font-family: var(--font-reading);
  font-size:   var(--font-size-reading);
  line-height: 1.85;
  text-align: center;
  max-width: 640px;
  color: var(--color-text);
  letter-spacing: 0.04em;
  transition: opacity 0.1s ease;
  position: relative;
  z-index: 1;
}

/* 操作ボタンバー */
.reading-controls {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  padding: 16px var(--padding-base);
}

.ctrl-btn {
  width: 60px; height: 60px;
  border-radius: 50%;
  border: 2px solid var(--color-border);
  background: var(--color-surface);
  font-size: 1.4rem;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: var(--transition);
  -webkit-tap-highlight-color: transparent;
}
.ctrl-btn:hover  { border-color: var(--color-primary); background: var(--color-primary-lt); }
.ctrl-btn:active { transform: scale(0.92); }

#btn-playpause {
  width: 70px; height: 70px;
  font-size: 1.6rem;
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}
#btn-playpause:hover { filter: brightness(1.12); }

/* 速度切替トグル（遅い/速いの2択） */
/* 速度ボタン */
.speed-control {
  background: var(--color-bg);
  border-top: 1px solid var(--color-border);
  padding: 10px var(--padding-base);
  display: flex;
  align-items: center;
  gap: 12px;
  justify-content: center;
}

.speed-toggle-label {
  font-size: 0.75rem;
  color: var(--color-text-sub);
  font-weight: 600;
  white-space: nowrap;
}

.speed-toggle-wrap {
  display: flex;
  border: 2px solid var(--color-border);
  border-radius: 10px;
  overflow: hidden;
  flex: 1;
  max-width: 360px;
}

.speed-toggle-btn {
  flex: 1;
  padding: 10px 12px;
  border: none;
  background: var(--color-surface);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  transition: var(--transition);
  -webkit-tap-highlight-color: transparent;
  border-right: 1px solid var(--color-border);
  min-height: 58px;
}
.speed-toggle-btn:last-child { border-right: none; }
.speed-toggle-btn.active {
  background: var(--color-primary);
  color: #fff;
}
.speed-toggle-btn:active { transform: scale(0.97); }
.spd-icon { font-size: 1.2rem; line-height: 1; }
.spd-name { font-size: 0.78rem; font-weight: 700; }
.spd-wpm  { font-size: 0.68rem; opacity: 0.7; }
.speed-toggle-btn.active .spd-wpm { opacity: 0.85; }

/* ── クイズ画面 ───────────────────────────────────────── */
.quiz-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  gap: 12px;
  padding-top: 4px;
}

#quiz-progress {
  font-size: 0.85rem;
  color: var(--color-text-sub);
  font-weight: 600;
}

.quiz-timer {
  min-width: 126px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  color: var(--color-primary);
  font-size: 0.78rem;
  font-weight: 700;
}
.quiz-timer[hidden] { display: none; }
.quiz-timer-label { white-space: nowrap; text-align: center; }
.quiz-timer-track {
  height: 6px;
  width: 100%;
  border-radius: 999px;
  overflow: hidden;
  background: var(--color-border);
}
.quiz-timer-bar {
  display: block;
  height: 100%;
  width: 100%;
  border-radius: inherit;
  background: var(--color-primary);
  transition: width 0.1s linear, background 0.2s ease;
}
.quiz-timer.warning { color: var(--color-wrong); }
.quiz-timer.warning .quiz-timer-bar { background: var(--color-wrong); }

/* いつでも終了ボタン */
.btn-quiz-end {
  background: transparent;
  color: var(--color-text-sub);
  border: 1.5px solid var(--color-border);
  border-radius: 20px;
  padding: 7px 16px;
  font-size: 0.82rem;
  cursor: pointer;
  min-height: 36px;
  white-space: nowrap;
  transition: var(--transition);
  font-family: inherit;
  -webkit-tap-highlight-color: transparent;
}
.btn-quiz-end:hover  { border-color: var(--color-wrong); color: var(--color-wrong); background: #fee2e2; }
.btn-quiz-end:active { transform: scale(0.96); }

/* 次の問題／結果ボタン */
.quiz-next-wrap {
  margin-top: 16px;
  display: flex;
  justify-content: flex-end;
}
.btn-quiz-next {
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: 10px;
  padding: 14px 28px;
  font-size: calc(1rem * var(--text-scale));
  font-weight: 700;
  cursor: pointer;
  min-height: 52px;
  min-width: 160px;
  transition: var(--transition);
  font-family: inherit;
  -webkit-tap-highlight-color: transparent;
  animation: slideUp 0.18s ease;
}
.btn-quiz-next:hover  { filter: brightness(1.12); }
.btn-quiz-next:active { transform: scale(0.97); }

@keyframes slideUp {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

#quiz-question {
  font-size: calc(1.15rem * var(--text-scale));
  font-weight: 700;
  line-height: 1.65;
  margin-bottom: 24px;
  padding: 20px;
  background: var(--color-surface);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
}

#quiz-choices {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 20px;
}

.choice-btn {
  padding: 16px 20px;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: 10px;
  font-size: calc(1rem * var(--text-scale));
  text-align: left;
  cursor: pointer;
  transition: var(--transition);
  min-height: 56px;
  font-family: inherit;
  -webkit-tap-highlight-color: transparent;
}
.choice-btn:hover:not(:disabled) {
  border-color: var(--color-primary);
  background: var(--color-primary-lt);
}
.choice-btn:disabled { opacity: 0.6; cursor: default; }

.quiz-feedback {
  padding: 14px 20px;
  border-radius: 10px;
  font-size: calc(1rem * var(--text-scale));
  font-weight: 600;
  text-align: center;
  animation: feedbackPop 0.2s ease;
}
.quiz-feedback.correct { background: #dcfce7; color: var(--color-correct); }
.quiz-feedback.wrong   { background: #fee2e2; color: var(--color-wrong); }

@keyframes feedbackPop {
  from { transform: scale(0.94); opacity: 0.6; }
  to   { transform: scale(1);    opacity: 1; }
}

/* ── 結果画面 ─────────────────────────────────────────── */
.result-header {
  text-align: center;
  padding: 24px 0 16px;
}

.result-rank {
  display: inline-block;
  width: 72px; height: 72px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-size: 2rem;
  font-weight: 900;
  line-height: 72px;
  text-align: center;
  margin-bottom: 12px;
}

.result-big-score {
  font-size: calc(2.4rem * var(--text-scale));
  font-weight: 900;
  color: var(--color-primary);
  line-height: 1;
}

.result-accuracy {
  font-size: calc(1.1rem * var(--text-scale));
  color: var(--color-text-sub);
  margin-top: 6px;
}

.result-meta {
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
  margin: 16px 0;
}

.result-meta-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  padding: 6px 14px;
  font-size: 0.85rem;
  color: var(--color-text-sub);
}

#result-badges {
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
  margin: 12px 0;
}
.badge {
  background: #fef3c7;
  border: 1px solid #fbbf24;
  border-radius: 20px;
  padding: 6px 14px;
  font-size: 0.85rem;
  color: #92400e;
}

.charts-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 20px 0;
}

.chart-card {
  background: var(--color-surface);
  border-radius: var(--radius-card);
  padding: 16px;
  box-shadow: var(--shadow-card);
}
.chart-title {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--color-text-sub);
  margin-bottom: 10px;
  text-align: center;
}

canvas { width: 100% !important; display: block; }

/* 回答一覧 */
#result-answers {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 16px 0;
}

.answer-item {
  background: var(--color-surface);
  border-radius: 8px;
  padding: 12px 16px;
  display: grid;
  grid-template-columns: 28px 24px 1fr;
  grid-template-rows: auto auto;
  gap: 2px 8px;
  box-shadow: var(--shadow-card);
  border-left: 3px solid var(--color-border);
}
.answer-item.right { border-left-color: var(--color-correct); }
.answer-item.wrong { border-left-color: var(--color-wrong); }
.answer-item.skipped { border-left-color: #d97706; background: #fffbeb; }

.ans-num   { grid-row: 1; font-size: 0.75rem; font-weight: 700; color: var(--color-text-sub); }
.ans-icon  { grid-row: 1 / 3; grid-column: 2; font-size: 1.1rem; align-self: center; }
.ans-q     { grid-row: 1; grid-column: 3; font-size: 0.9rem; font-weight: 600; }
.ans-detail{ grid-row: 2; grid-column: 3; font-size: 0.8rem; color: var(--color-text-sub); }

.result-completion-note {
  margin: 0 auto 18px;
  max-width: 640px;
  padding: 10px 14px;
  border: 1px solid #f59e0b;
  border-radius: var(--radius-card);
  background: #fffbeb;
  color: #92400e;
  font-size: 0.84rem;
}

.result-completion-note[hidden] { display: none; }

.result-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  padding: 20px 0 32px;
}

/* ── 履歴画面 ─────────────────────────────────────────── */
.history-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

#history-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.history-item {
  background: var(--color-surface);
  border-radius: var(--radius-card);
  padding: 14px 18px;
  box-shadow: var(--shadow-card);
}

.his-header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 8px;
  margin-bottom: 6px;
}
.his-title { font-weight: 600; font-size: 0.95rem; }
.his-date  { font-size: 0.75rem; color: var(--color-text-sub); white-space: nowrap; }
.his-incomplete {
  border-radius: 999px;
  padding: 1px 8px;
  background: #fffbeb;
  color: #b45309;
  font-weight: 700;
}

.his-stats {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  font-size: 0.82rem;
  color: var(--color-text-sub);
}

/* ── レスポンシブ ─────────────────────────────────────── */
@media (max-width: 600px) {
  :root {
    --padding-base: 16px;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .charts-row {
    grid-template-columns: 1fr;
  }
  .result-actions {
    flex-direction: column;
    align-items: center;
  }
  .stat-value {
    font-size: calc(1.3rem * var(--text-scale));
  }
}

/* ── ローディング ─────────────────────────────────────── */
#loading-screen {
  position: fixed; inset: 0;
  background: var(--color-bg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 999;
  gap: 16px;
  transition: opacity 0.3s;
}
#loading-screen.hidden {
  opacity: 0;
  pointer-events: none;
}
.loading-spinner {
  width: 40px; height: 40px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Touch-first refinements for tablets */
@media (pointer: coarse), (max-width: 1024px) {
  html {
    font-size: 17px;
  }

  body {
    overscroll-behavior-y: contain;
    touch-action: manipulation;
  }

  #app-header {
    min-height: 68px;
    height: auto;
    padding: 10px var(--padding-base);
    gap: 14px;
  }

  #header-title {
    font-size: calc(1.2rem * var(--text-scale));
    line-height: 1.25;
  }

  .header-nav {
    gap: 10px;
  }

  .nav-btn,
  .btn-start,
  .btn-primary,
  .btn-secondary,
  .btn-danger,
  .btn-quiz-end,
  .btn-quiz-next,
  .choice-btn,
  .speed-toggle-btn,
  .ctrl-btn {
    min-height: 56px;
    border-radius: 8px;
    -webkit-user-select: none;
    user-select: none;
  }

  .nav-btn {
    min-width: 92px;
    padding: 12px 18px;
    font-size: 0.95rem;
    border-width: 2px;
    background: var(--color-surface);
  }

  .screen {
    max-width: 980px;
    padding: 24px;
  }

  .stats-grid {
    gap: 16px;
  }

  .stat-card,
  .material-card,
  #quiz-question,
  .choice-btn,
  .chart-card,
  .history-item {
    box-shadow: 0 4px 18px rgba(28,25,23,0.08), 0 0 0 1px var(--color-border);
  }

  .stat-card {
    padding: 20px 14px;
  }

  .material-card {
    padding: 22px;
    align-items: stretch;
  }

  .mat-info {
    min-width: 0;
  }

  .mat-title {
    font-size: calc(1.18rem * var(--text-scale));
    line-height: 1.45;
  }

  .btn-start {
    min-width: 132px;
    padding: 14px 24px;
    align-self: center;
  }

  #screen-reading.active {
    min-height: calc(100vh - 68px);
  }

  .progress-wrapper,
  #reading-bar {
    height: 8px;
  }

  #reading-progress {
    padding: 14px var(--padding-base) 10px;
    font-size: 1rem;
    font-weight: 700;
  }

  #reading-main {
    min-height: 48vh;
    padding: 46px 76px;
  }

  .tap-zone {
    width: 44%;
  }

  .tap-zone::after {
    opacity: 0.18;
    font-size: 2.1rem;
  }

  .tap-zone:active {
    background: rgba(45, 74, 138, 0.12);
  }

  #tap-prev {
    padding-left: 22px;
  }

  #tap-next {
    padding-right: 22px;
  }

  #reading-sentence {
    max-width: 760px;
    font-size: clamp(1.45rem, 2.5vw, 2rem);
    line-height: 1.9;
    letter-spacing: 0;
  }

  .reading-controls {
    position: sticky;
    bottom: 0;
    z-index: 60;
    gap: 18px;
    padding: 18px var(--padding-base);
    box-shadow: 0 -10px 26px rgba(28,25,23,0.08);
  }

  .ctrl-btn {
    width: 86px;
    height: 64px;
    font-size: 1.15rem;
    font-weight: 800;
    border-radius: 8px;
  }

  #btn-playpause {
    width: 132px;
    height: 68px;
    font-size: 1rem;
  }

  .speed-control {
    position: sticky;
    bottom: 100px;
    z-index: 55;
    padding: 14px var(--padding-base);
    gap: 14px;
    box-shadow: 0 -4px 18px rgba(28,25,23,0.05);
  }

  .speed-toggle-label {
    font-size: 0.95rem;
  }

  .speed-toggle-wrap {
    max-width: 620px;
    border-radius: 8px;
    display: grid;
    grid-auto-flow: column;
    grid-auto-columns: 1fr;
  }

  .speed-toggle-btn {
    gap: 4px;
    padding: 12px 10px;
    border-right: 1px solid var(--color-border);
  }

  .speed-toggle-btn:last-child {
    border-right: none;
  }

  .spd-icon {
    display: none;
  }

  .spd-name {
    font-size: 0.96rem;
  }

  .spd-wpm {
    font-size: 0.78rem;
  }

  .quiz-header {
    position: sticky;
    top: 68px;
    z-index: 50;
    background: var(--color-bg);
    padding: 12px 0;
  }

  #quiz-progress {
    font-size: 1rem;
  }

  .btn-quiz-end {
    min-width: 124px;
    border-radius: 8px;
    padding: 12px 18px;
  }

  #quiz-question {
    font-size: calc(1.25rem * var(--text-scale));
    padding: 24px;
    margin-bottom: 18px;
  }

  #quiz-choices {
    gap: 14px;
  }

  .choice-btn {
    padding: 20px 24px;
    font-size: calc(1.08rem * var(--text-scale));
    line-height: 1.5;
    border-width: 2px;
  }

  .choice-btn:active:not(:disabled) {
    transform: scale(0.99);
  }

  .choice-btn:disabled {
    opacity: 1;
  }

  .quiz-feedback {
    padding: 18px 22px;
    font-size: calc(1.08rem * var(--text-scale));
  }

  .quiz-next-wrap {
    position: sticky;
    bottom: 0;
    z-index: 45;
    background: linear-gradient(to top, var(--color-bg) 72%, rgba(248,246,241,0));
    padding: 18px 0 8px;
  }

  .btn-quiz-next {
    width: min(100%, 360px);
    min-height: 64px;
  }

  .result-actions {
    position: sticky;
    bottom: 0;
    background: linear-gradient(to top, var(--color-bg) 72%, rgba(248,246,241,0));
    padding: 20px 0 12px;
  }

  .result-actions .btn-primary,
  .result-actions .btn-secondary {
    min-width: 180px;
  }

  .history-item {
    padding: 18px 20px;
  }

  .his-title {
    font-size: 1.05rem;
  }

  .his-stats {
    gap: 10px;
    font-size: 0.9rem;
  }
}

@media (pointer: coarse) and (orientation: landscape) {
  #reading-main {
    min-height: 40vh;
  }

  .speed-control {
    bottom: 96px;
  }
}

@media (max-width: 720px) {
  #app-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .header-nav,
  .nav-btn,
  .material-card,
  .btn-start,
  .speed-toggle-wrap,
  .result-actions .btn-primary,
  .result-actions .btn-secondary {
    width: 100%;
  }

  .header-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .material-card {
    flex-direction: column;
  }

  #reading-main {
    min-height: 46vh;
    padding: 34px 44px;
  }

  .reading-controls {
    gap: 10px;
  }

  .ctrl-btn {
    width: 72px;
  }

  #btn-playpause {
    flex: 1;
    max-width: 168px;
  }

  .speed-control {
    bottom: 96px;
    align-items: stretch;
    flex-direction: column;
  }

  .speed-toggle-wrap {
    max-width: none;
  }

  .quiz-next-wrap {
    justify-content: stretch;
  }

  .btn-quiz-next {
    width: 100%;
  }
}