[hidden] { display: none !important; }
html, body { max-width: 100%; overflow-x: hidden; }
.piano-keyboard { overflow-x: auto; overflow-y: hidden; }
.selected-note-chips{display:flex;gap:.5rem;justify-content:center;min-height:2rem;margin:.75rem 0;flex-wrap:wrap}.selected-note-chip{padding:.35rem .7rem;border-radius:999px;background:var(--color-primary,#6750a4);color:#fff}.interval-choices{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:.5rem;margin:1rem auto;max-width:760px}

/* ========================================
   ピアノ音当てゲーム - スタイルシート
   ======================================== */

/* ---- CSSカスタムプロパティ (クリームテーマ) ---- */
:root {
  /* ベースカラー */
  --bg-primary: #f5e6c8;
  --bg-secondary: #ede0c0;
  --bg-card: #fff8e7;
  --bg-card-hover: #fff3d6;
  --bg-overlay: rgba(0, 0, 0, 0.5);

  /* テキスト */
  --text-primary: #3a2a1a;
  --text-secondary: #7a6a5a;
  --text-muted: #9a8a7a;
  --text-on-primary: #ffffff;

  /* アクセント */
  --accent-primary: #8b6f4a;
  --accent-primary-light: #a88b66;
  --accent-secondary: #c9a87c;
  --accent-success: #4caf50;
  --accent-error: #e53935;
  --accent-info: #42a5f5;
  --accent-warning: #ffa726;

  /* サーフェス */
  --border-color: #d4c4a8;
  --border-light: #e8dcc8;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);

  /* ピアノ鍵盤 */
  --white-key: #ffffff;
  --white-key-border: #cccccc;
  --black-key: #333333;
  --black-key-top: #555555;
  --key-selected: #42a5f5;
  --key-correct: #4caf50;
  --key-wrong: #e53935;

  /* サイズ */
  --header-height: 56px;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-top: env(safe-area-inset-top, 0px);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  /* フォント */
  --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", "Hiragino Sans", "Noto Sans JP", "Yu Gothic", sans-serif;
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-base: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 22px;
  --font-size-2xl: 28px;
  --font-size-3xl: 36px;

  /* スペーシング */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;

  /* トランジション */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 400ms ease;

  /* 装飾 */
  --piano-gradient: linear-gradient(180deg, #f5e6c8 0%, #ede0c0 100%);
}

/* ---- ダークテーマ ---- */
[data-theme="dark"] {
  --bg-primary: #1a1a2e;
  --bg-secondary: #16213e;
  --bg-card: #1f2940;
  --bg-card-hover: #2a3650;
  --bg-overlay: rgba(0, 0, 0, 0.7);

  --text-primary: #e8e0d0;
  --text-secondary: #a09888;
  --text-muted: #706858;
  --text-on-primary: #ffffff;

  --accent-primary: #7c6f9a;
  --accent-primary-light: #9a8db8;
  --accent-secondary: #5a4d78;

  --border-color: #2a3650;
  --border-light: #2a3650;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);

  --white-key: #e8e0d0;
  --white-key-border: #3a3a5a;
  --black-key: #0a0a1a;
  --black-key-top: #2a2a4a;

  --piano-gradient: linear-gradient(180deg, #1a1a2e 0%, #16213e 100%);
}

/* ---- モーションプリファレンス ---- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ---- リセット ---- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-main);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  min-height: 100dvh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ---- スクロールバー ---- */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 3px;
}

/* ---- ユーティリティ ---- */
.hidden { display: none !important; }

/* ---- オーバーレイ（音声有効化） ---- */
.overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--piano-gradient);
  padding: var(--space-md);
}

.overlay-content {
  text-align: center;
  max-width: 400px;
  width: 100%;
  animation: fadeInUp 0.6s ease;
}

.overlay-icon {
  font-size: 64px;
  margin-bottom: var(--space-md);
  animation: float 3s ease-in-out infinite;
}

.overlay-title {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--space-sm);
}

.overlay-description {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
}

.overlay-note {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  margin-top: var(--space-md);
}

/* ---- アプリケーションコンテナ ---- */
#app {
  max-width: 100%;
  min-height: 100vh;
  min-height: 100dvh;
  padding-top: var(--safe-top);
  padding-bottom: var(--safe-bottom);
  background: var(--bg-primary);
}

/* ---- 画面システム ---- */
.screen {
  display: none;
  flex-direction: column;
  min-height: 100vh;
  min-height: 100dvh;
  animation: fadeIn 0.3s ease;
}

.screen.active {
  display: flex;
}

/* ---- 画面ヘッダー ---- */
.screen-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  min-height: var(--header-height);
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-light);
  position: sticky;
  top: 0;
  z-index: 10;
  flex-shrink: 0;
}

.screen-title {
  font-size: var(--font-size-lg);
  font-weight: 600;
  flex: 1;
}

.btn-back {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: none;
  background: none;
  color: var(--text-primary);
  font-size: var(--font-size-xl);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
  -webkit-tap-highlight-color: transparent;
}

.btn-back:hover,
.btn-back:focus-visible {
  background: var(--bg-card-hover);
}

.btn-back:active {
  transform: scale(0.95);
}

/* ---- 画面本文 ---- */
.screen-body {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-md);
  padding-bottom: calc(var(--space-md) + var(--safe-bottom));
  -webkit-overflow-scrolling: touch;
}

/* ---- カード ---- */
.card {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--bg-card);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  border: 1px solid var(--border-light);
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.card:hover,
.card:focus-visible {
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.card:active {
  transform: scale(0.98);
}

.card-accent {
  border-left: 4px solid var(--accent-primary);
}

.card-primary {
  background: var(--accent-primary);
  color: var(--text-on-primary);
  border-color: var(--accent-primary);
}

.card-primary .card-title {
  color: var(--text-on-primary);
}

.card-primary .card-subtitle {
  color: rgba(255, 255, 255, 0.8);
}

.card-icon {
  font-size: 28px;
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.card-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.card-title {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--text-primary);
}

.card-subtitle {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

/* ---- ボタン ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 12px 24px;
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: 600;
  font-family: var(--font-main);
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  transform: none !important;
}

.btn:active:not(:disabled) {
  transform: scale(0.97);
}

.btn-primary {
  background: var(--accent-primary);
  color: var(--text-on-primary);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover:not(:disabled),
.btn-primary:focus-visible:not(:disabled) {
  background: var(--accent-primary-light);
  box-shadow: var(--shadow-md);
}

.btn-secondary {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover:not(:disabled),
.btn-secondary:focus-visible:not(:disabled) {
  background: var(--bg-card-hover);
}

.btn-danger {
  background: var(--accent-error);
  color: var(--text-on-primary);
}

.btn-danger:hover:not(:disabled),
.btn-danger:focus-visible:not(:disabled) {
  opacity: 0.9;
}

.btn-full {
  width: 100%;
  justify-content: center;
}

.btn-large {
  padding: 16px 32px;
  font-size: var(--font-size-lg);
  border-radius: var(--radius-lg);
}

.btn-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: none;
  background: none;
  color: var(--text-primary);
  font-size: var(--font-size-lg);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: background var(--transition-fast);
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.btn-icon:hover,
.btn-icon:focus-visible {
  background: var(--bg-card-hover);
}

.btn-icon:active {
  transform: scale(0.95);
}

/* ---- ホーム画面 ---- */
.screen-home-inner {
  padding: var(--space-md);
  padding-bottom: calc(var(--space-md) + var(--safe-bottom));
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.home-header {
  margin-bottom: var(--space-lg);
}

.home-title-area {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
}

.app-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-primary);
}

.profile-badge {
  font-size: var(--font-size-xs);
  padding: 4px 12px;
  border-radius: 20px;
  background: var(--accent-secondary);
  color: var(--text-on-primary);
  white-space: nowrap;
}

.home-cards {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.audio-source-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: 0.9rem;
}
.audio-source-card [data-state="ready"] { color: var(--accent-success); }
.audio-source-card [data-state="error"] { color: var(--accent-danger); }
.mode-card.is-disabled { opacity: 0.52; cursor: not-allowed; }

.home-stats {
  display: flex;
  justify-content: space-around;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
  padding: var(--space-md);
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.stat-value {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--accent-primary);
}

.stat-label {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
}

/* ---- モード選択 ---- */
.mode-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
}

.mode-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: var(--space-xs);
  padding: var(--space-md) var(--space-sm);
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.mode-card:hover,
.mode-card:focus-visible {
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.mode-card:active {
  transform: scale(0.97);
}

.mode-icon {
  font-size: 32px;
  margin-bottom: var(--space-xs);
}

.mode-name {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-primary);
}

.mode-desc {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  line-height: 1.4;
}

/* ---- セッション画面 ---- */
.session-progress-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.session-mode-label {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-primary);
}

.session-progress-text {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
}

.session-streak {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--accent-success);
  padding: 4px 8px;
  background: rgba(76, 175, 80, 0.1);
  border-radius: var(--radius-sm);
}

.session-progress-bar {
  width: 100%;
  height: 4px;
  background: var(--bg-card);
  flex-shrink: 0;
}

.progress-fill {
  height: 100%;
  background: var(--accent-primary);
  transition: width var(--transition-normal);
  border-radius: 0 2px 2px 0;
}

.session-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-md);
  gap: var(--space-md);
  overflow-y: auto;
}

.session-question-area {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  width: 100%;
}

.btn-play {
  min-width: 200px;
}

.play-icon {
  font-size: 20px;
}

.session-status {
  text-align: center;
  min-height: 60px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
}

/* Stage 9 lifecycle host. Individual visual effects are added in later units. */
.effects-host { min-height: 0; display: flex; justify-content: center; margin-top: var(--space-xs); }
.effects-skip-btn { min-width: 9rem; }
.correct-effect-card {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xs) var(--space-md);
  border: 2px solid var(--accent-success);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  box-shadow: 0 3px 0 rgba(76, 175, 80, 0.32);
  color: var(--text-primary);
}
.correct-effect-mark {
  display: inline-grid;
  place-items: center;
  width: 1.65rem;
  height: 1.65rem;
  border: 2px solid currentColor;
  border-radius: 50%;
  color: var(--accent-success);
  font-weight: 800;
}
.correct-effect-copy { display: inline-flex; align-items: baseline; flex-wrap: wrap; gap: var(--space-xs); }
.correct-effect-copy strong { color: var(--text-primary); }
.correct-effect-combo, .correct-effect-perfect { font-size: var(--font-size-sm); font-weight: 700; color: var(--accent-success); }
.effects-host[data-effect-strength="normal"] .correct-effect-card,
.effects-host[data-effect-strength="flashy"] .correct-effect-card { animation: correctEffectLift 0.42s ease-out; }
.effects-host[data-effect-strength="flashy"] .correct-effect-mark { animation: correctEffectPulse 0.8s ease-in-out 2; }

/* ---- 不正解演出カード（第9段階） ---- */
.incorrect-effect-card {
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-xs) var(--space-sm);
  padding: var(--space-xs) var(--space-md);
  border: 2px solid var(--accent-error);
  border-radius: var(--radius-md);
  background: var(--bg-card);
  box-shadow: 0 3px 0 rgba(229, 57, 53, 0.32);
  color: var(--text-primary);
  animation: fadeIn 0.3s ease;
}
.incorrect-effect-mark {
  display: inline-grid;
  place-items: center;
  width: 1.65rem;
  height: 1.65rem;
  border: 2px solid currentColor;
  border-radius: 50%;
  color: var(--accent-error);
  font-weight: 800;
  flex-shrink: 0;
}
.incorrect-effect-copy {
  display: inline-flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: var(--space-xs);
}
.incorrect-effect-copy strong { color: var(--text-primary); }
.incorrect-compare {
  width: 100%;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs) var(--space-sm);
  padding: var(--space-xs) 0;
  font-size: var(--font-size-sm);
  line-height: 1.6;
}
.incorrect-correct-label { color: var(--accent-success); }
.incorrect-correct-label strong { color: var(--accent-success); }
.incorrect-answer-label { color: var(--accent-error); }
.incorrect-answer-label strong { color: var(--accent-error); }
.incorrect-diff { color: var(--text-secondary); font-weight: 600; }
.incorrect-match-label { color: var(--accent-success); }
.incorrect-match-label strong { color: var(--accent-success); }
.incorrect-missing-label { color: var(--accent-warning); }
.incorrect-missing-label strong { color: var(--accent-warning); }
.incorrect-extra-label { color: var(--accent-error); }
.incorrect-extra-label strong { color: var(--accent-error); }
.incorrect-part-judgment {
  width: 100%;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  font-size: var(--font-size-xs);
}
.incorrect-part-ok { color: var(--accent-success); font-weight: 600; }
.incorrect-part-ng { color: var(--accent-error); font-weight: 600; }

/* Keyboard wrong effect key state */
.piano-key.effect-wrong {
  outline: 3px solid currentColor;
  outline-offset: -5px;
  box-shadow: inset 0 0 0 3px rgba(255, 255, 255, 0.82), 0 0 0 3px var(--accent-error);
}

@keyframes correctEffectLift { from { opacity: 0; transform: translateY(8px) scale(0.96); } to { opacity: 1; transform: translateY(0) scale(1); } }
@keyframes correctEffectPulse { 50% { transform: scale(1.16); } }

/* ---- ピアノ鍵盤 ---- */
.piano-container {
  flex-shrink: 0;
  padding: var(--space-sm) var(--space-md);
  padding-bottom: 0;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-light);
}

.piano-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-sm);
}

.piano-range-label {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-secondary);
  min-width: 80px;
  text-align: center;
}

.piano-keyboard {
  display: flex;
  position: relative;
  height: 140px;
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
}

.piano-key {
  position: relative;
  cursor: pointer;
  transition: background var(--transition-fast);
  -webkit-tap-highlight-color: transparent;
}

.piano-key:active {
  transform: translateY(2px);
}

/* 黒鍵は押下時も横方向の中央配置を維持する。 */
.black-key:active {
  transform: translateX(-50%) translateY(2px);
}

.white-key {
  flex: 1;
  height: 100%;
  background: var(--white-key);
  border: 1px solid var(--white-key-border);
  border-radius: 0 0 6px 6px;
  z-index: 1;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: 8px;
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

.white-key:hover {
  background: #f8f4ec;
}

[data-theme="dark"] .white-key:hover {
  background: #f0e8d8;
}

.black-key-wrapper {
  position: absolute;
  z-index: 2;
  width: 0;
  height: 0;
  pointer-events: none;
}

.black-key {
  position: absolute;
  width: 28px;
  height: 65%;
  background: var(--black-key);
  border: 1px solid var(--black-key-top);
  border-radius: 0 0 4px 4px;
  cursor: pointer;
  pointer-events: auto;
  transform: translateX(-50%);
  top: 0;
  z-index: 2;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding-bottom: 6px;
  font-size: 9px;
  color: rgba(255, 255, 255, 0.5);
}

.black-key:hover {
  background: #4a4a6a;
}

@media (max-width: 700px) {
  .piano-keyboard .white-key {
    min-width: 0;
    padding-bottom: 4px;
    font-size: 8px;
    line-height: 1;
    white-space: nowrap;
    overflow: hidden;
  }

  .piano-keyboard .black-key {
    width: 22px;
    padding-bottom: 4px;
    font-size: 7px;
    line-height: 1;
  }

  .piano-keyboard .black-key .nl-main {
    display: none;
  }
}

[data-theme="dark"] .black-key:hover {
  background: #3a3a5a;
}

/* 鍵盤状態 */
.piano-key.selected {
  background: var(--key-selected) !important;
  color: white !important;
}

.piano-key.correct {
  background: var(--key-correct) !important;
  color: white !important;
  animation: pulseGlow 0.6s ease;
}

/* A temporary correct-answer emphasis layers on top of existing feedback classes. */
.piano-key.effect-correct {
  outline: 3px solid currentColor;
  outline-offset: -5px;
  box-shadow: inset 0 0 0 3px rgba(255, 255, 255, 0.82), 0 0 0 3px var(--accent-success);
}

@media (prefers-reduced-motion: reduce) {
  .correct-effect-card, .correct-effect-mark { animation: none !important; }
}

.piano-key.wrong {
  background: var(--key-wrong) !important;
  color: white !important;
  animation: shake 0.3s ease;
}

.piano-key.midi-active {
  box-shadow: inset 0 -4px 0 var(--key-selected);
}

/* ---- セッション操作ボタン ---- */
.session-actions {
  display: flex;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  padding-bottom: calc(var(--space-sm) + var(--safe-bottom));
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-light);
  flex-shrink: 0;
}

.session-actions .btn {
  flex: 1;
  font-size: var(--font-size-sm);
  padding: 12px 8px;
}

/* ---- カレンダー ---- */
.calendar-checkin {
  margin-bottom: var(--space-md);
}

.calendar-today-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex: 1;
}

.calendar-today-date {
  font-size: var(--font-size-lg);
  font-weight: 600;
}

.calendar-checkin-status {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.calendar-month-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.calendar-month-label {
  font-size: var(--font-size-lg);
  font-weight: 600;
  min-width: 160px;
  text-align: center;
}

.calendar-date-detail {
  margin-bottom: var(--space-md);
  display: grid;
  gap: 10px;
}

.calendar-day { min-width: 0; min-height: 0; }

@media (min-width: 800px) {
  #screen-calendar .screen-body { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(320px, .85fr); gap: var(--space-md); align-content: start; }
  #screen-calendar .calendar-checkin, #screen-calendar .calendar-month-nav, #screen-calendar .calendar-grid { grid-column: 1; }
  #screen-calendar .calendar-date-detail, #screen-calendar .calendar-today-code { grid-column: 2; }
}

.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 2px;
  margin-bottom: var(--space-md);
}

.calendar-weekday {
  text-align: center;
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  padding: var(--space-xs) 0;
  font-weight: 600;
}

.calendar-day {
  aspect-ratio: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: var(--font-size-sm);
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  transition: all var(--transition-fast);
  user-select: none;
  position: relative;
  line-height: 1;
}

.calendar-day:hover,
.calendar-day:focus-visible {
  background: var(--bg-card-hover);
}

.calendar-day.checked {
  border-color: var(--accent-success);
  background: rgba(76, 175, 80, 0.1);
}

.calendar-day.today {
  border-color: var(--accent-primary);
  font-weight: 700;
}

.calendar-day.other-month {
  opacity: 0.3;
}

.calendar-day .day-number { line-height: 1; }

.calendar-day .day-stamp {
  font-size: 16px;
  line-height: 1;
}

.calendar-day .day-label {
  position: absolute;
  right: 2px;
  bottom: 2px;
  font-size: 9px;
  line-height: 1;
  white-space: nowrap;
}

.calendar-today-code {
  padding: var(--space-md);
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
}

.calendar-date-summary,
.calendar-session-history {
  padding: 12px;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
}

.calendar-detail-date {
  margin: 0 0 var(--space-sm);
  font-size: var(--font-size-lg);
  line-height: 1.35;
}

.calendar-summary-stats,
.calendar-summary-status,
.calendar-session-main,
.calendar-session-meta,
.calendar-panel-heading {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.calendar-summary-stats {
  flex-wrap: wrap;
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

.calendar-summary-stats strong { color: var(--text-primary); }

.calendar-summary-status {
  flex-wrap: wrap;
  margin-top: var(--space-sm);
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
}

.calendar-summary-code {
  display: grid;
  gap: 4px;
  padding: 8px 10px;
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
}

.calendar-summary-code .calendar-checkin-trivia {
  display: -webkit-box;
  margin-top: 2px;
  overflow: hidden;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.calendar-summary-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 8px;
  color: var(--text-secondary);
  font-size: var(--font-size-xs);
}

.calendar-checkin-code { margin: 0; color: var(--text-primary); font-weight: 600; }
.calendar-checkin-trivia { margin: var(--space-xs) 0 0; color: var(--text-secondary); font-size: var(--font-size-sm); line-height: 1.5; }
.calendar-checkin-code span, .calendar-detail-muted { color: var(--text-secondary); font-weight: 400; }
.calendar-detail-muted { margin: 0; }
.calendar-detail-status { color: var(--text-secondary); }

.calendar-panel-heading { justify-content: space-between; margin-bottom: var(--space-sm); }
.calendar-panel-heading h3 { margin: 0; font-size: var(--font-size-base); }
.calendar-panel-heading > span { color: var(--text-muted); font-size: var(--font-size-xs); }

.calendar-session-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  max-height: min(34vh, 300px);
  margin: 0;
  padding: 0 2px 0 0;
  overflow-y: auto;
  list-style: none;
  scrollbar-gutter: stable;
}

.calendar-session-row { margin: 0; }

button.calendar-session-card {
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-sm);
  min-height: 44px;
  padding: 7px 9px;
  color: var(--text-primary);
  font: inherit;
  text-align: left;
  background: var(--bg-card-hover);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-sm);
  cursor: pointer;
}

button.calendar-session-card:hover { border-color: var(--accent-primary); }
button.calendar-session-card:focus-visible { outline: 2px solid var(--accent-primary); outline-offset: 2px; }

.calendar-session-main { min-width: 0; flex: 1 1 auto; flex-direction: row; align-items: center; gap: 8px; }
.calendar-session-mode { overflow: hidden; max-width: 100%; font-size: var(--font-size-sm); font-weight: 600; text-overflow: ellipsis; white-space: nowrap; }
.calendar-session-score { flex: 0 0 auto; color: var(--text-secondary); font-size: var(--font-size-xs); white-space: nowrap; }
.calendar-session-score strong { color: var(--text-primary); }
.calendar-session-meta { flex: 0 0 auto; justify-content: flex-end; flex-wrap: wrap; font-size: var(--font-size-xs); text-align: right; }
.calendar-session-meta time { color: var(--text-muted); white-space: nowrap; }

.calendar-session-badge { padding: 2px 5px; border: 1px solid currentColor; border-radius: 999px; font-size: 10px; font-weight: 600; line-height: 1.2; white-space: nowrap; }
.calendar-session-badge.review { color: var(--accent-info); }
.calendar-session-badge.perfect { color: var(--accent-success); }
.calendar-session-empty { padding: var(--space-md) 0; color: var(--text-muted); font-size: var(--font-size-sm); text-align: center; }
.calendar-review-button { margin-top: var(--space-sm); }

@media (max-width: 799px) {
  #screen-calendar .screen-body { overflow-x: hidden; }
  .calendar-session-list { max-height: 260px; }
}

@media (max-width: 390px) {
  .calendar-summary-status { align-items: flex-start; flex-direction: column; }
  button.calendar-session-card { align-items: flex-start; flex-direction: column; }
  .calendar-session-meta { width: 100%; justify-content: flex-start; text-align: left; }
}

.code-name {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--accent-primary);
  margin-bottom: var(--space-xs);
}

.code-notes {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}

.trivia-text {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-top: var(--space-md);
  padding-top: var(--space-md);
  border-top: 1px solid var(--border-light);
  line-height: 1.8;
}

/* ---- 履歴 ---- */
.history-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.history-filters, .review-mode-filters, .review-starts, .sd-audio-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
}

.history-date-group {
  margin: var(--space-md) 0 var(--space-xs);
  font-size: var(--font-size-sm);
  color: var(--text-muted);
}

button.history-item { width: 100%; text-align: left; color: inherit; font: inherit; cursor: pointer; }

.review-shortage { width: 100%; margin: var(--space-xs) 0 0; color: var(--text-muted); font-size: var(--font-size-sm); }

.note-comparison { display: flex; flex-wrap: wrap; gap: 4px; margin-top: var(--space-xs); }
.note-compare { padding: 2px 5px; border-radius: 4px; font-size: var(--font-size-xs); background: var(--bg-card-hover); }
.note-compare.correct { border-left: 3px solid var(--accent-success); }
.note-compare.answer { border-left: 3px solid var(--accent-error); }
.note-compare.match { border-left: 3px solid var(--accent-info); }
.note-compare.missing { border-left: 3px solid var(--accent-warning); }
.note-compare.extra { border-left: 3px solid var(--accent-error); }
.comparison-keyboard { display: flex; gap: 3px; margin-top: var(--space-xs); min-height: 36px; align-items: end; }
.comparison-key { min-width: 32px; min-height: 34px; padding: 3px; border: 1px solid var(--border-light); border-radius: 3px 3px 6px 6px; background: var(--bg-card); text-align: center; font-size: var(--font-size-xs); }
.comparison-key small { display: block; font-size: 10px; }
.comparison-key.match { border-color: var(--accent-success); box-shadow: inset 0 -4px 0 var(--accent-success); }
.comparison-key.missing { border-color: var(--accent-warning); box-shadow: inset 0 -4px 0 var(--accent-warning); }
.comparison-key.extra { border-color: var(--accent-error); box-shadow: inset 0 -4px 0 var(--accent-error); }

.history-item {
  padding: var(--space-md);
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.history-item:hover,
.history-item:focus-visible {
  background: var(--bg-card-hover);
  transform: translateY(-1px);
}

.history-item-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-xs);
}

.history-mode {
  font-weight: 600;
  font-size: var(--font-size-sm);
}

.history-date {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

.history-stats {
  display: flex;
  gap: var(--space-md);
  font-size: var(--font-size-sm);
}

.history-accuracy {
  font-weight: 600;
  color: var(--accent-success);
}

.history-accuracy.low {
  color: var(--accent-error);
}

/* ---- 空の状態 ---- */
.empty-state {
  text-align: center;
  color: var(--text-muted);
  padding: var(--space-xl) var(--space-md);
  font-size: var(--font-size-base);
}

/* ---- 設定画面 ---- */
.settings-scroll {
  padding-bottom: calc(var(--space-xl) + var(--safe-bottom));
}

.settings-section {
  margin-bottom: var(--space-lg);
}

.settings-section-title {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--accent-primary);
  margin-bottom: var(--space-sm);
  padding-bottom: var(--space-xs);
  border-bottom: 1px solid var(--border-light);
}

.settings-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) 0;
  gap: var(--space-sm);
  min-height: 44px;
}

.settings-label {
  font-size: var(--font-size-sm);
  color: var(--text-primary);
  flex-shrink: 0;
}

.settings-value {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.settings-choices {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

.choice-btn {
  padding: 6px 14px;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-primary);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-family: var(--font-main);
  cursor: pointer;
  transition: all var(--transition-fast);
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.choice-btn:hover,
.choice-btn:focus-visible {
  background: var(--bg-card-hover);
}

.choice-btn.choice-active {
  background: var(--accent-primary);
  color: var(--text-on-primary);
  border-color: var(--accent-primary);
}

/* スライダー */
.settings-slider {
  flex-wrap: wrap;
}

.slider {
  -webkit-appearance: none;
  appearance: none;
  flex: 1;
  min-width: 80px;
  height: 6px;
  border-radius: 3px;
  background: var(--border-color);
  outline: none;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--accent-primary);
  cursor: pointer;
  border: 2px solid var(--bg-card);
  box-shadow: var(--shadow-sm);
}

.slider::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--accent-primary);
  cursor: pointer;
  border: 2px solid var(--bg-card);
  box-shadow: var(--shadow-sm);
}

.slider-value {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  min-width: 40px;
  text-align: right;
}

/* ---- MIDIテスト ---- */
.midi-status {
  margin-bottom: var(--space-md);
  padding: var(--space-sm);
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
}

.midi-devices {
  margin-bottom: var(--space-md);
}

.midi-device-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm);
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-xs);
  border: 1px solid var(--border-light);
}

.midi-device-item.active {
  border-color: var(--accent-primary);
  background: rgba(139, 111, 74, 0.1);
}

.midi-note-display {
  font-size: var(--font-size-3xl);
  font-weight: 700;
  text-align: center;
  padding: var(--space-lg);
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  margin-bottom: var(--space-md);
}

.midi-note-info {
  margin-bottom: var(--space-md);
}

.midi-info-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xs);
}

.midi-info-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: var(--space-xs) var(--space-sm);
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
}

.midi-info-label {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

.midi-info-value {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--text-primary);
}

.midi-active-notes,
.midi-event-log {
  margin-bottom: var(--space-md);
}

.midi-active-notes h4,
.midi-event-log h4 {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: var(--space-xs);
}

.midi-active-notes-list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  min-height: 30px;
}

.midi-active-note-chip {
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--accent-primary);
  color: var(--text-on-primary);
  font-size: var(--font-size-sm);
  font-weight: 600;
}

.midi-event-log-list {
  max-height: 200px;
  overflow-y: auto;
  font-size: var(--font-size-xs);
  font-family: monospace;
  padding: var(--space-xs);
  background: var(--bg-secondary);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
  line-height: 1.8;
}

.midi-event-entry {
  padding: 2px 0;
  border-bottom: 1px solid var(--border-light);
}

.midi-event-entry:last-child {
  border-bottom: none;
}

.settings-select {
  padding: 6px 12px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  color: var(--text-primary);
  font-size: var(--font-size-sm);
  font-family: var(--font-main);
  max-width: 200px;
}

/* ---- MIDIステータス表示（セッション画面用） ---- */
.session-midi-indicator {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: var(--font-size-xs);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  background: rgba(66, 165, 245, 0.1);
  color: var(--accent-info);
  border: 1px solid rgba(66, 165, 245, 0.3);
}

.session-midi-indicator.active {
  background: rgba(76, 175, 80, 0.1);
  color: var(--accent-success);
  border-color: rgba(76, 175, 80, 0.3);
}

@media (min-width: 768px) {
  .midi-info-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ---- 成績分析 ---- */
.analytics-summary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.analytics-card {
  text-align: center;
  padding: var(--space-md);
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
}

.analytics-value {
  display: block;
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--accent-primary);
}

.analytics-label {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
}

.analytics-section {
  margin-bottom: var(--space-lg);
}

.analytics-section-title {
  font-size: var(--font-size-base);
  font-weight: 600;
  margin-bottom: var(--space-sm);
}

.heatmap-container {
  min-height: 100px;
}

/* ---- セッション結果 ---- */
.result-summary {
  text-align: center;
  margin-bottom: var(--space-lg);
}

.result-perfect {
  margin-bottom: var(--space-md);
}

.result-perfect-title {
  font-size: var(--font-size-2xl);
  color: var(--accent-success);
  animation: bounce 1s ease;
}

.result-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.result-stat {
  text-align: center;
  padding: var(--space-md);
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
}

.result-stat-value {
  display: block;
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--accent-primary);
}

.result-stat-label {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
}

.result-heatmap {
  min-height: 60px;
  margin-top: var(--space-md);
}

.result-heatmap-title {
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--text-primary);
}

.result-heatmap-caption {
  margin-top: 2px;
  color: var(--text-secondary);
  font-size: var(--font-size-xs);
}

.result-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

/* ---- プロフィール管理 ---- */
.profile-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.profile-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.profile-item:hover,
.profile-item:focus-visible {
  background: var(--bg-card-hover);
}

.profile-item.active {
  border-color: var(--accent-primary);
  background: rgba(139, 111, 74, 0.08);
}

.profile-icon {
  font-size: 32px;
}

.profile-info {
  flex: 1;
}

.profile-name {
  font-weight: 600;
  font-size: var(--font-size-base);
}

.profile-detail {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
}

/* ---- プロフィール管理 ---- */
.profile-create-form {
  padding: var(--space-md);
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  margin-bottom: var(--space-sm);
  animation: fadeIn 0.2s ease;
}

.profile-name-input {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: var(--font-size-base);
  font-family: var(--font-main);
  outline: none;
  transition: border-color var(--transition-fast);
  box-sizing: border-box;
}

.profile-name-input:focus {
  border-color: var(--accent-primary);
}

.profile-name-input::placeholder {
  color: var(--text-muted);
}

.profile-create-actions {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-sm);
}

.profile-create-actions .btn {
  flex: 1;
}

.profile-actions {
  display: flex;
  gap: var(--space-xs);
  flex-shrink: 0;
}

.profile-action-btn {
  padding: 6px 10px;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  font-family: var(--font-main);
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.profile-action-btn:hover,
.profile-action-btn:focus-visible {
  background: var(--bg-card-hover);
}

.profile-action-btn.danger {
  color: var(--accent-error);
  border-color: rgba(229, 57, 53, 0.3);
}

.profile-action-btn.danger:hover {
  background: rgba(229, 57, 53, 0.1);
}

.profile-rename-form {
  flex: 1;
  display: flex;
  gap: var(--space-xs);
}

.profile-rename-input {
  flex: 1;
  padding: 6px 10px;
  border: 2px solid var(--accent-primary);
  border-radius: var(--radius-sm);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: var(--font-size-sm);
  font-family: var(--font-main);
  outline: none;
  min-width: 0;
}

/* ---- 確認ダイアログ ---- */
.dialog-overlay {
  position: fixed;
  inset: 0;
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-md);
  background: rgba(0, 0, 0, 0.5);
  animation: fadeIn 0.2s ease;
}

.dialog-content {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  max-width: 360px;
  width: 100%;
  box-shadow: var(--shadow-lg);
  animation: scaleIn 0.2s ease;
}

.dialog-message {
  font-size: var(--font-size-base);
  margin-bottom: var(--space-lg);
  text-align: center;
  line-height: 1.6;
}

.dialog-actions {
  display: flex;
  gap: var(--space-sm);
}

.dialog-actions .btn {
  flex: 1;
}

.session-countdown {
  min-height: 3.2rem;
  margin-bottom: var(--space-sm);
  color: var(--accent-primary);
  font-size: clamp(2rem, 8vw, 3rem);
  font-weight: 800;
  line-height: 1;
  text-align: center;
}

@media (max-width: 480px) {
  .dialog-content {
    padding: var(--space-md);
  }

  .dialog-actions {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .dialog-actions .btn {
    min-width: 0;
    white-space: normal;
    line-height: 1.35;
    overflow-wrap: anywhere;
  }
}

/* ---- 第12段階 データ管理 ---- */
.data-management-scroll {
  max-width: 900px;
  margin: 0 auto;
  padding-bottom: calc(var(--space-xl) + env(safe-area-inset-bottom));
}

.data-management-lead,
.data-management-status,
.data-management-result {
  color: var(--text-secondary);
  line-height: 1.7;
  overflow-wrap: anywhere;
}

.data-management-section {
  display: grid;
  gap: var(--space-sm);
  margin: var(--space-md) 0;
  padding: var(--space-md);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  background: var(--bg-card);
}

.data-danger-section {
  border-color: color-mix(in srgb, var(--accent-error) 45%, var(--border-color));
}

.data-file-label {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 var(--space-md);
  border: 1px dashed var(--accent-primary);
  border-radius: var(--radius-md);
  color: var(--accent-primary);
  cursor: pointer;
  font-weight: 700;
}

.data-file-input {
  width: 100%;
  min-height: 44px;
  padding: var(--space-sm);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  color: var(--text-primary);
}

.data-validation-errors {
  max-height: 18rem;
  overflow: auto;
  padding: var(--space-md);
  border: 1px solid var(--accent-error);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--accent-error) 12%, var(--bg-card));
  color: var(--text-primary);
}

.data-validation-errors ul {
  margin: var(--space-sm) 0 0;
  padding-left: 1.25rem;
}

.data-restore-preview {
  display: grid;
  gap: var(--space-sm);
  padding: var(--space-md);
  border: 1px solid var(--accent-primary);
  border-radius: var(--radius-md);
  background: color-mix(in srgb, var(--accent-primary) 7%, var(--bg-card));
}

.data-restore-preview h4 {
  margin: 0;
  color: var(--accent-primary);
}

.data-preview-list {
  display: grid;
  grid-template-columns: minmax(9rem, 0.8fr) minmax(0, 1.2fr);
  gap: 0;
  margin: 0;
}

.data-preview-list dt,
.data-preview-list dd {
  min-width: 0;
  margin: 0;
  padding: 0.45rem 0;
  border-bottom: 1px solid var(--border-color);
  overflow-wrap: anywhere;
}

.data-preview-list dt { color: var(--text-secondary); font-weight: 700; }
.data-preview-list dd { color: var(--text-primary); }

.data-management-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-sm);
}

.data-delete-dialog {
  width: min(92vw, 560px);
}

.settings-input {
  width: 100%;
  min-height: 44px;
  box-sizing: border-box;
  padding: 0.65rem 0.8rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  color: var(--text-primary);
  font: inherit;
}

[data-theme="dark"] .data-management-section,
[data-theme="dark"] .data-restore-preview { background: color-mix(in srgb, #ffffff 4%, var(--bg-card)); }

@media (max-width: 480px) {
  .data-management-section { padding: var(--space-sm); }
  .data-preview-list { grid-template-columns: minmax(7rem, 0.9fr) minmax(0, 1.1fr); font-size: 0.92rem; }
  .data-management-actions { grid-template-columns: 1fr; }
  .data-file-label { width: 100%; box-sizing: border-box; justify-content: center; }
}

@media (max-width: 380px) {
  .data-preview-list { grid-template-columns: 1fr; }
  .data-preview-list dt { border-bottom: 0; padding-bottom: 0.1rem; }
  .data-preview-list dd { padding-top: 0.1rem; }
}

/* ---- エラー通知 ---- */
.error-notification {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 900;
  padding: var(--space-sm) var(--space-md);
  padding-top: calc(var(--space-sm) + var(--safe-top));
  background: var(--accent-error);
  color: white;
  animation: slideDown 0.3s ease;
}

.error-notification-inner {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.error-message {
  flex: 1;
  font-size: var(--font-size-sm);
}

.error-notification .btn-icon {
  color: white;
  flex-shrink: 0;
}

.error-notification .btn-icon:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* ---- セッション詳細 ---- */
#session-detail-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

/* ---- アニメーション ---- */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.9);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-100%);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes pulseGlow {
  0% { box-shadow: 0 0 0 0 rgba(76, 175, 80, 0.4); }
  50% { box-shadow: 0 0 20px 8px rgba(76, 175, 80, 0.2); }
  100% { box-shadow: 0 0 0 0 rgba(76, 175, 80, 0); }
}

@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-4px); }
  75% { transform: translateX(4px); }
}

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  30% { transform: translateY(-15px); }
  50% { transform: translateY(-5px); }
  70% { transform: translateY(-10px); }
}

/* ---- レスポンシブ：タブレット以上 ---- */
@media (min-width: 768px) {
  .screen-body {
    padding: var(--space-lg);
  }

  .home-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  #home-checkin-card {
    grid-column: 1 / -1;
  }

  .mode-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .piano-keyboard {
    height: 180px;
  }

  .black-key {
    width: 34px;
  }

  .session-actions .btn {
    font-size: var(--font-size-base);
  }

  /* PCでは2カラム */
  @media (min-width: 1024px) {
    /* ホームはPCでも横Flexの内容幅縮小を使わず、中央のデスクトップ幅で表示する。 */
    #screen-home {
      flex-direction: column;
    }

    #screen-home .screen-home-inner {
      align-self: center;
      width: 100%;
      max-width: 1280px;
      flex: 1 1 auto;
      padding: var(--space-lg) var(--space-xl);
    }

    #screen-home .home-cards {
      gap: var(--space-md);
    }

    #screen-home .card {
      min-height: 112px;
      padding: var(--space-lg);
    }

    #screen-home .card-icon {
      width: 64px;
      height: 64px;
      font-size: 36px;
    }

    #screen-home .card-title {
      font-size: var(--font-size-lg);
    }

    #screen-home .card-subtitle {
      font-size: var(--font-size-base);
    }

    #screen-home .home-stats {
      margin-top: var(--space-xl);
      padding: var(--space-lg);
    }

    .screen.active {
      flex-direction: row;
      flex-wrap: wrap;
    }

    .screen-header {
      width: 100%;
    }

    .screen-body {
      flex: 1;
      max-height: calc(100vh - var(--header-height) - var(--safe-top));
    }

    .piano-keyboard {
      height: 200px;
    }
  }
}

/* ---- レスポンシブ：スマートフォン ---- */
@media (max-width: 480px) {
  .mode-grid {
    grid-template-columns: 1fr 1fr;
    gap: 6px;
  }

  .mode-card {
    padding: var(--space-sm);
  }

  .mode-icon {
    font-size: 24px;
  }

  .mode-name {
    font-size: var(--font-size-xs);
  }

  .mode-desc {
    display: none;
  }

  .piano-keyboard {
    height: 120px;
  }

  .black-key {
    width: 24px;
  }

  .session-actions {
    gap: 4px;
  }

  .session-actions .btn {
    padding: 10px 6px;
    font-size: var(--font-size-xs);
  }

  .analytics-summary {
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
  }

  .analytics-card {
    padding: var(--space-sm);
  }

  .result-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .home-stats {
    gap: 0;
  }
}

/* ---- iOS/Android ハック ---- */
@supports (padding: max(0px)) {
  #app {
    padding-top: max(var(--safe-top), 0px);
    padding-bottom: max(var(--safe-bottom), 0px);
  }
}

/* タップ時のハイライト除去 */
input, button, textarea, select {
  -webkit-tap-highlight-color: transparent;
}

/* フォーカスリング */
:focus-visible {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

/* フルスクリーン用 */
.btn-small {
  padding: 6px 12px;
  font-size: var(--font-size-xs);
  border-radius: var(--radius-sm);
}

.audio-test-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: var(--space-sm) var(--space-md);
  padding-bottom: 0;
  background: var(--bg-secondary);
  flex-shrink: 0;
  justify-content: center;
}

.bgm-status {
  padding: var(--space-sm);
  background: rgba(255, 167, 38, 0.1);
  border: 1px solid rgba(255, 167, 38, 0.3);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-sm);
  animation: fadeIn 0.2s ease;
}

.bgm-status-text {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-xs);
}

.bgm-status-actions {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
}

.toggle-label {
  position: relative;
  display: inline-block;
  width: 48px;
  height: 26px;
  cursor: pointer;
}

.toggle-input {
  opacity: 0;
  width: 0;
  height: 0;
}

.toggle-slider {
  position: absolute;
  inset: 0;
  background: var(--border-color);
  border-radius: 26px;
  transition: all var(--transition-fast);
}

.toggle-slider::before {
  content: '';
  position: absolute;
  width: 20px;
  height: 20px;
  left: 3px;
  bottom: 3px;
  background: white;
  border-radius: 50%;
  transition: all var(--transition-fast);
}

.toggle-input:checked + .toggle-slider {
  background: var(--accent-success);
}

.toggle-input:checked + .toggle-slider::before {
  transform: translateX(22px);
}

.toggle-input:focus-visible + .toggle-slider {
  outline: 2px solid var(--accent-primary);
  outline-offset: 2px;
}

:-webkit-full-screen .piano-keyboard {
  height: 250px;
}

/* ---- モバイル黒鍵ポップアップ ---- */
.piano-mobile-label {
  position: absolute;
  top: -30px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--black-key);
  color: white;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-weight: 600;
  white-space: nowrap;
  z-index: 5;
  pointer-events: none;
  animation: fadeIn 0.15s ease;
}

.piano-container {
  position: relative;
}

@media (min-width: 481px) {
  .piano-mobile-label {
    display: none !important;
  }
}

/* ---- 出題管理 ---- */
.pool-info {
  padding: var(--space-sm);
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
  margin-bottom: var(--space-sm);
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}

.pool-info-text {
  display: block;
  line-height: 1.6;
}

/* ---- 音名ラベル ---- */
.white-key .nl-main {
  display: block;
  text-align: center;
  font-size: 11px;
  line-height: 1.2;
}

.white-key .nl-sub {
  display: block;
  text-align: center;
  font-size: 9px;
  line-height: 1.1;
  opacity: 0.7;
}

.black-key .nl-main {
  display: block;
  text-align: center;
  font-size: 9px;
  line-height: 1.1;
  color: rgba(255,255,255,0.7);
}

.black-key .nl-sub {
  display: none;
}

/* スマートフォンでは黒鍵ラベルを控えめに */
@media (max-width: 480px) {
  .black-key .nl-main {
    display: none;
  }
}

/* ---- セッションフィードバック ---- */
.result-feedback {
  text-align: center;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  animation: fadeIn 0.3s ease;
}

.correct-feedback {
  background: rgba(76, 175, 80, 0.12);
  border: 1px solid rgba(76, 175, 80, 0.3);
}

.wrong-feedback {
  background: rgba(229, 57, 53, 0.1);
  border: 1px solid rgba(229, 57, 53, 0.25);
}

.feedback-icon {
  font-size: 32px;
  display: block;
  margin-bottom: var(--space-xs);
}

.feedback-text {
  font-size: var(--font-size-lg);
  font-weight: 700;
  display: block;
}

.correct-feedback .feedback-text {
  color: var(--accent-success);
}

.wrong-feedback .feedback-text {
  color: var(--accent-error);
}

.feedback-note {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  display: block;
  margin-top: var(--space-xs);
}

.feedback-detail {
  font-size: var(--font-size-base);
  color: var(--accent-warning);
  font-weight: 600;
  display: block;
  margin-top: var(--space-xs);
}

.feedback-answer {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  display: block;
  margin-top: 2px;
}

.question-label {
  font-size: var(--font-size-lg);
  font-weight: 600;
  color: var(--text-primary);
  text-align: center;
}

/* ---- セッション画面の手動進行と鍵盤レイアウト ---- */
#screen-session .session-body {
  min-height: 0;
  justify-content: flex-start;
  padding: clamp(10px, 1.5vw, 20px) clamp(10px, 2vw, 28px) 8px;
  gap: clamp(8px, 1.2vw, 16px);
}

#screen-session .session-question-area {
  flex: 0 0 auto;
  max-width: 760px;
  gap: clamp(8px, 1vw, 14px);
}

#screen-session .answer-next-btn {
  min-width: min(240px, 100%);
  max-width: 100%;
  white-space: nowrap;
}

#screen-session .session-actions .answer-next-btn {
  margin-top: 2px;
}

#screen-session .piano-container {
  width: 100%;
  box-sizing: border-box;
  padding: 8px clamp(8px, 1.5vw, 22px) 10px;
}

#screen-session .piano-keyboard {
  width: min(100%, 1120px);
  height: clamp(150px, 18vw, 220px);
  margin-inline: auto;
}

#screen-session .white-key,
#screen-session .black-key {
  box-sizing: border-box;
}

#screen-session .white-key {
  overflow: visible;
  padding-inline: 0;
}

#screen-session .white-key .nl-main,
#screen-session .black-key .nl-main {
  white-space: nowrap;
  word-break: keep-all;
  overflow: visible;
  letter-spacing: 0;
  transform-origin: center;
}

#screen-session .white-key .nl-main {
  transform: scaleX(.82);
}

#screen-session .black-key {
  width: clamp(22px, 2.7vw, 36px);
  padding-inline: 1px;
}

#screen-session .black-key .nl-main {
  display: block;
  transform: scaleX(.78);
  font-size: clamp(6px, .7vw, 9px);
}

@media (min-width: 1024px) {
  #screen-session.active {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(300px, min(34vw, 440px));
    grid-template-rows: auto auto minmax(0, 1fr) auto auto;
    align-items: stretch;
  }

  #screen-session .screen-header,
  #screen-session .session-progress-bar {
    grid-column: 1 / -1;
  }

  #screen-session .screen-header { grid-row: 1; }
  #screen-session .session-progress-bar { grid-row: 2; }
  #screen-session .session-body {
    grid-column: 1;
    grid-row: 3;
    max-height: none;
    align-self: stretch;
    justify-content: center;
  }

  #screen-session .piano-container {
    grid-column: 1;
    grid-row: 4;
  }

  #screen-session .audio-test-buttons {
    grid-column: 1;
    grid-row: 5;
  }

  #screen-session .session-actions {
    grid-column: 2;
    grid-row: 3 / 6;
    align-self: stretch;
    flex-direction: column;
    justify-content: center;
    padding: var(--space-lg);
    border-top: 0;
    border-left: 1px solid var(--border-light);
  }

  #screen-session .session-actions .btn {
    width: 100%;
    flex: 0 0 auto;
  }
}

@media (max-width: 480px) {
  #screen-session .session-body { padding-inline: 8px; }
  #screen-session .piano-keyboard { height: 158px; }
  #screen-session .white-key .nl-main {
    font-size: clamp(5.5px, 1.75vw, 8px);
    line-height: 1;
    transform: scaleX(.8);
  }
  #screen-session .black-key {
    width: 22px;
    padding-bottom: 4px;
  }
  #screen-session .black-key .nl-main {
    display: block;
    font-size: 6px;
    line-height: 1;
    transform: scaleX(.75);
  }
  #screen-session .session-status { min-height: 48px; }
  #screen-session .feedback-detail,
  #screen-session .feedback-answer { font-size: var(--font-size-xs); }
  #screen-session .answer-next-btn { min-height: 42px; }
}

@media (max-width: 767px) {
  #screen-session .session-actions {
    flex-direction: column;
    align-items: stretch;
  }

  #screen-session .session-actions .btn,
  #screen-session .session-actions .answer-next-btn {
    flex: 0 0 auto;
    width: 100%;
    margin-top: 0;
  }
}

/* ========================================
   第6段階: 復習画面
   ======================================== */
.review-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
}

.review-count {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--accent-primary);
}

.review-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.review-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  transition: all var(--transition-fast);
}

.review-item:hover {
  background: var(--bg-card-hover);
}

.review-item-header {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.review-mode-badge {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

.review-note {
  font-size: var(--font-size-base);
  font-weight: 600;
}

.review-item-actions {
  flex-shrink: 0;
}

.review-session-card {
  overflow: hidden;
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
}

.review-saved-sessions {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
}

.review-saved-sessions h3 {
  margin: 0;
  color: var(--text-primary);
  font-size: var(--font-size-base);
}

.review-incomplete-session-card {
  border-color: var(--accent-info);
}

.review-incomplete-session-summary {
  cursor: default;
}

.review-session-saved {
  color: var(--accent-info);
  font-weight: 600;
}

.review-session-heading {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
}

.review-session-toggle {
  display: grid;
  flex: 1;
  min-width: 0;
  grid-template-columns: minmax(10rem, 1.4fr) minmax(5rem, .8fr) repeat(3, max-content) auto;
  align-items: center;
  gap: var(--space-sm);
  padding: 0;
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
  background: transparent;
  border: 0;
}

.review-session-date, .review-session-mode { font-weight: 600; }
.review-session-result, .review-session-candidates, .review-session-reviewed, .review-question-wrong { color: var(--text-muted); font-size: var(--font-size-sm); white-space: nowrap; }
.review-session-reviewed { color: var(--accent-info); }
.review-session-toggle-mark { color: var(--text-muted); }
.review-session-details { padding: 0 var(--space-md) var(--space-md); border-top: 1px solid var(--border-light); }
.review-session-questions { display: flex; flex-direction: column; gap: var(--space-xs); margin: var(--space-sm) 0 0; padding: 0; list-style: none; }
.review-session-question { display: grid; grid-template-columns: 1.6rem minmax(0, 1fr) max-content max-content; align-items: center; gap: var(--space-sm); padding: var(--space-xs) 0; }
.review-question-order { display: grid; place-items: center; width: 1.5rem; height: 1.5rem; color: var(--text-secondary); font-size: var(--font-size-xs); background: var(--bg-card-hover); border-radius: 50%; }
.review-question-note { min-width: 0; font-weight: 600; overflow-wrap: anywhere; }

@media (max-width: 600px) {
  .review-session-heading { align-items: stretch; flex-direction: column; }
  .review-session-toggle { grid-template-columns: minmax(0, 1fr) auto; gap: var(--space-xs) var(--space-sm); }
  .review-session-mode, .review-session-result, .review-session-candidates, .review-session-reviewed { grid-column: 1; }
  .review-session-toggle-mark { grid-column: 2; grid-row: 1 / span 2; align-self: center; }
  .review-session-start { width: 100%; }
  .review-session-question { grid-template-columns: 1.6rem minmax(0, 1fr); gap: var(--space-xs) var(--space-sm); }
  .review-question-wrong { grid-column: 2; }
  .review-session-question .btn { grid-column: 2; width: 100%; }
}

/* ========================================
   第6段階: 成績分析
   ======================================== */
.mode-breakdown-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.mode-breakdown-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm);
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
}

.breakdown-mode {
  min-width: 100px;
  font-weight: 600;
  font-size: var(--font-size-sm);
}

.breakdown-bar-bg {
  flex: 1;
  height: 12px;
  background: var(--bg-secondary);
  border-radius: 6px;
  overflow: hidden;
}

.breakdown-bar-fill {
  height: 100%;
  background: var(--accent-primary);
  border-radius: 6px;
  transition: width var(--transition-normal);
}

.breakdown-pct {
  min-width: 40px;
  text-align: right;
  font-weight: 700;
  font-size: var(--font-size-sm);
  color: var(--accent-primary);
}

.breakdown-nums {
  min-width: 60px;
  text-align: right;
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

.heatmap-summary {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}

.heatmap-bar {
  height: 20px;
  background: var(--bg-secondary);
  border-radius: 10px;
  overflow: hidden;
}

.heatmap-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-success), var(--accent-primary));
  border-radius: 10px;
  transition: width var(--transition-slow);
}

/* ========================================
   第6段階: セッション詳細
   ======================================== */
.sd-header {
  text-align: center;
  margin-bottom: var(--space-md);
}

.sd-mode {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--text-primary);
}

.sd-date {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  margin-top: var(--space-xs);
}

.sd-summary {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}

.sd-stat {
  text-align: center;
  padding: var(--space-sm);
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
}

.sd-stat-val {
  display: block;
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--accent-primary);
}

.sd-stat-lbl {
  display: block;
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
}

.sd-question-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.sd-question {
  display: flex;
  gap: var(--space-sm);
  padding: var(--space-sm);
  background: var(--bg-card);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-light);
  transition: all var(--transition-fast);
}

.sd-question:hover {
  background: var(--bg-card-hover);
}

.sd-q-num {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--text-muted);
  min-width: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.sd-q-body {
  flex: 1;
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
}

.sd-q-status {
  font-size: var(--font-size-lg);
  min-width: 28px;
  text-align: center;
}

.sd-q-details {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sd-q-row {
  display: flex;
  gap: var(--space-sm);
  font-size: var(--font-size-sm);
}

.sd-label {
  color: var(--text-muted);
  min-width: 40px;
  flex-shrink: 0;
}

.sd-value {
  color: var(--text-primary);
  font-weight: 600;
}

.sd-correct {
  color: var(--accent-success);
}

.sd-wrong {
  color: var(--accent-error);
}

@media (max-width: 480px) {
  .sd-summary {
    grid-template-columns: repeat(2, 1fr);
  }
  .breakdown-mode {
    min-width: 70px;
  }
}

.atomic-test-panel {
  position: fixed; inset: 1rem; z-index: 10000; overflow: auto;
  padding: 1rem; border: 2px solid #315c9b; border-radius: 12px;
  background: #fff; color: #172033; box-shadow: 0 8px 32px #0004;
}
.stage5-final-panel{max-height:92vh;overflow:auto;max-width:min(720px,calc(100vw - 24px))}
.stage5-final-actions{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:8px}
#stage5-final-inputs{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px;margin:8px 0}
#stage5-final-inputs>*{min-width:0;padding:6px;border:1px solid #999;background:#fff;color:#222}
.atomic-test-panel pre { white-space: pre-wrap; overflow-wrap: anywhere; }

/* ---- 成績分析ダッシュボード（見やすさ・子ども向け表示） ---- */
#screen-analytics {
  align-content: flex-start;
}

#screen-analytics .screen-header {
  flex: 0 0 auto;
}

#screen-analytics .screen-body {
  width: 100%;
  max-width: 1440px;
  margin: 0 auto;
  background: linear-gradient(180deg, rgba(255, 248, 231, 0.42), rgba(245, 230, 200, 0));
}

#screen-analytics .screen-header {
  min-height: 44px;
  padding-top: 4px;
  padding-bottom: 4px;
}

#screen-analytics .screen-header .btn-back {
  width: 34px;
  height: 34px;
}

#screen-analytics .analytics-period-filter {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

#screen-analytics .analytics-period-filter .choice-btn {
  min-width: 92px;
  min-height: 40px;
  border-radius: 999px;
  font-weight: 700;
}

#screen-analytics .analytics-summary {
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

#screen-analytics .analytics-card {
  min-height: 92px;
  padding: 12px 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-sm);
  border-top: 4px solid var(--accent-secondary);
}

#screen-analytics .analytics-card:nth-child(2) { border-top-color: var(--accent-success); }
#screen-analytics .analytics-card:nth-child(3) { border-top-color: var(--accent-info); }
#screen-analytics .analytics-card:nth-child(4) { border-top-color: var(--accent-warning); }
#screen-analytics .analytics-card:nth-child(5) { border-top-color: var(--accent-primary); }

#screen-analytics .analytics-value {
  font-size: clamp(24px, 2.2vw, 34px);
  line-height: 1.15;
}

#screen-analytics .analytics-label {
  margin-top: 4px;
  font-size: var(--font-size-sm);
  font-weight: 600;
}

.analytics-primary-grid,
.analytics-details-grid {
  display: grid;
  gap: var(--space-md);
}

.analytics-primary-grid {
  grid-template-columns: minmax(0, 1.25fr) minmax(320px, 0.75fr);
  margin-bottom: var(--space-md);
}

.analytics-details-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

#screen-analytics .analytics-section {
  min-width: 0;
  margin-bottom: 0;
  padding: 14px 16px;
  background: rgba(255, 248, 231, 0.9);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

#screen-analytics .analytics-section-wide {
  grid-column: 1 / -1;
}

#screen-analytics .analytics-section-title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 10px;
  color: var(--text-primary);
  font-size: var(--font-size-lg);
  font-weight: 800;
}

#screen-analytics .analytics-section-title::before {
  content: '';
  width: 8px;
  height: 24px;
  flex: 0 0 auto;
  border-radius: 999px;
  background: linear-gradient(180deg, var(--accent-info), var(--accent-primary));
}

#daily-chart-svg-container {
  min-height: 128px;
  padding: 4px 8px 0;
  background: rgba(237, 224, 192, 0.34);
  border-radius: var(--radius-sm);
}

#mode-bar-chart-container .bar-chart {
  gap: 10px !important;
  padding: 8px 0 !important;
}

#mode-bar-chart-container .bar-chart-row {
  min-height: 34px;
}

#mode-bar-chart-container .bar-chart-label {
  color: var(--text-primary);
  font-weight: 700;
}

#mode-bar-chart-container .bar-chart-bar-bg {
  height: 18px !important;
  border: 1px solid var(--border-light);
  border-radius: 999px !important;
}

#mode-bar-chart-container .bar-chart-bar-fill {
  background: linear-gradient(90deg, var(--accent-info), var(--accent-primary)) !important;
  border-radius: 999px !important;
}

#mode-bar-chart-container .bar-chart-pct {
  color: var(--accent-primary);
  font-weight: 800;
}

.analytics-details-grid .empty-state {
  min-height: 42px;
  display: grid;
  place-items: center;
  color: var(--text-muted);
  background: rgba(237, 224, 192, 0.28);
  border-radius: var(--radius-sm);
}

.analytics-note-list,
.analytics-interval-list,
.analytics-chord-list,
.analytics-missing-list,
.analytics-extra-list {
  display: grid;
  gap: 6px;
}

.analytics-note-row,
.analytics-interval-row,
.analytics-chord-row,
.analytics-missing-row,
.analytics-extra-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px 12px;
  padding: 8px 10px;
  background: rgba(237, 224, 192, 0.36);
  border: 1px solid rgba(212, 196, 168, 0.7);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
}

.analytics-note-row > span:first-child,
.interval-name,
.chord-name,
.missing-name,
.extra-name {
  min-width: 72px;
  color: var(--accent-primary);
  font-weight: 800;
}

.analytics-interval-row,
.analytics-chord-row {
  justify-content: space-between;
}

#analytics-pitch-tendency p {
  padding: 10px 12px;
  background: rgba(237, 224, 192, 0.36);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
}

#analytics-confusions ul {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px 18px;
  padding-left: 20px;
  font-size: var(--font-size-sm);
}

/* 分析用鍵盤：白鍵と黒鍵の高さ・ラベル・余白を揃えて読みやすくする。 */
.heatmap-container {
  min-height: 148px;
}

.heatmap-keyboard-wrapper {
  padding: 12px 12px 10px;
  overflow: hidden;
  background: linear-gradient(180deg, #e7d6b2 0%, #d8bd91 100%);
  border: 1px solid #c4a676;
  border-radius: var(--radius-md);
  box-shadow: inset 0 2px 0 rgba(255, 255, 255, 0.45), var(--shadow-sm);
}

.heatmap-white-keys {
  height: 132px !important;
  gap: 2px;
  padding: 0 2px;
  overflow: visible;
}

.heatmap-key.white-key {
  min-width: 0;
  padding: 0 2px 12px;
  background: linear-gradient(180deg, #ffffff 0%, #f3eee5 100%);
  border: 1px solid #c4c7cc;
  border-radius: 0 0 8px 8px;
  color: #5b6470;
  font-size: 11px;
  font-weight: 700;
  box-shadow: 0 2px 0 rgba(99, 75, 42, 0.2);
}

.heatmap-key.black-key {
  width: clamp(20px, 1.8vw, 34px);
  height: 70%;
  padding: 8px 1px 8px;
  background: linear-gradient(180deg, #48505d 0%, #1e2530 100%);
  border: 1px solid #10151c;
  border-radius: 0 0 6px 6px;
  color: rgba(255, 255, 255, 0.86);
  font-size: 9px;
  font-weight: 700;
  box-shadow: 0 3px 3px rgba(50, 37, 22, 0.28);
}

.heatmap-key-label {
  position: absolute;
  left: 50%;
  bottom: 17px;
  max-width: 100%;
  transform: translateX(-50%);
  overflow: hidden;
  white-space: nowrap;
  pointer-events: none;
}

.heatmap-key.black-key .heatmap-key-label {
  top: 8px;
  bottom: auto;
  font-size: 8px;
}

.heatmap-count-label {
  position: absolute;
  left: 50%;
  bottom: 31px;
  transform: translateX(-50%);
  color: var(--accent-error);
  font-size: 10px;
  font-weight: 800;
  pointer-events: none;
}

.heatmap-key:hover {
  filter: brightness(1.06);
}

.heatmap-key .heatmap-dot {
  box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.6);
}

@media (max-width: 900px) {
  .analytics-primary-grid,
  .analytics-details-grid {
    grid-template-columns: 1fr;
  }

  #screen-analytics .analytics-section-wide {
    grid-column: auto;
  }
}

@media (max-width: 767px) {
  #screen-analytics .analytics-summary {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  #screen-analytics .analytics-card {
    min-height: 80px;
  }

  #screen-analytics .analytics-label {
    font-size: var(--font-size-xs);
  }
}

@media (max-width: 480px) {
  #screen-analytics .analytics-summary {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  #screen-analytics .analytics-section {
    padding: 12px;
  }

  #screen-analytics .analytics-section-title {
    font-size: var(--font-size-base);
  }

  #analytics-confusions ul {
    grid-template-columns: 1fr;
  }

  .heatmap-key.black-key {
    width: 22px;
  }
}

/* 16:9デスクトップ：最初の画面内で概要を読み取れる密度にする。 */
@media (min-width: 1024px) and (min-aspect-ratio: 16/9) {
  #screen-analytics .screen-body {
    max-width: 1600px;
    padding: 14px 24px calc(var(--space-md) + var(--safe-bottom));
  }

  #screen-analytics .analytics-period-filter {
    margin-bottom: 10px;
  }

  #screen-analytics .analytics-summary {
    gap: 10px;
    margin-bottom: 12px;
  }

  #screen-analytics .analytics-card {
    min-height: 78px;
    padding: 8px 10px;
  }

  #screen-analytics .analytics-value {
    font-size: clamp(22px, 1.8vw, 30px);
  }

  .analytics-primary-grid {
    gap: 12px;
    margin-bottom: 12px;
  }

  #screen-analytics .analytics-section {
    padding: 11px 14px;
  }

  #screen-analytics .analytics-section-title {
    margin-bottom: 7px;
    font-size: var(--font-size-base);
  }

  #screen-analytics .analytics-section-title::before {
    width: 6px;
    height: 20px;
  }

  #daily-chart-svg-container {
    height: 128px !important;
    min-height: 112px;
  }

  .analytics-details-grid {
    gap: 12px;
  }

  .heatmap-container {
    min-height: 132px;
  }

  .heatmap-white-keys {
    height: 118px !important;
  }
}

/* スマートフォン：横幅を使い切り、指標・グラフ・鍵盤を縦に読みやすくする。 */
@media (max-width: 767px) {
  #screen-analytics .screen-body {
    padding: 10px;
  }

  #screen-analytics .analytics-period-filter {
    gap: 6px;
    margin-bottom: 10px;
  }

  #screen-analytics .analytics-period-filter .choice-btn {
    flex: 1 1 0;
    min-width: 0;
    min-height: 36px;
    padding: 8px 6px;
    font-size: var(--font-size-xs);
  }

  #screen-analytics .analytics-summary {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 6px;
    margin-bottom: 10px;
  }

  #screen-analytics .analytics-card {
    min-height: 74px;
    padding: 8px 4px;
  }

  #screen-analytics .analytics-value {
    font-size: clamp(20px, 7vw, 28px);
  }

  #screen-analytics .analytics-label {
    margin-top: 2px;
    font-size: 11px;
    white-space: nowrap;
  }

  .analytics-primary-grid,
  .analytics-details-grid {
    gap: 10px;
  }

  .analytics-primary-grid {
    margin-bottom: 10px;
  }

  #screen-analytics .analytics-section {
    padding: 10px;
  }

  #screen-analytics .analytics-section-title {
    gap: 6px;
    margin-bottom: 7px;
    font-size: var(--font-size-base);
  }

  #screen-analytics .analytics-section-title::before {
    width: 6px;
    height: 18px;
  }

  #daily-chart-svg-container {
    height: 126px !important;
    min-height: 110px;
    padding: 2px 4px 0;
  }

  #mode-bar-chart-container .bar-chart-row {
    min-height: 30px;
  }

  #mode-bar-chart-container .bar-chart-label {
    width: 84px !important;
    font-size: 11px !important;
  }

  #mode-bar-chart-container .bar-chart-count {
    font-size: 10px !important;
  }

  .analytics-note-row,
  .analytics-interval-row,
  .analytics-chord-row,
  .analytics-missing-row,
  .analytics-extra-row {
    gap: 4px 8px;
    padding: 7px 8px;
    font-size: var(--font-size-xs);
  }

  #analytics-confusions ul {
    gap: 4px;
    font-size: var(--font-size-xs);
  }

  .heatmap-container {
    min-height: 132px;
  }

  .heatmap-keyboard-wrapper {
    padding: 8px 6px 7px;
  }

  .heatmap-white-keys {
    height: 112px !important;
    gap: 1px;
    padding: 0 1px;
  }

  .heatmap-key.white-key {
    padding-bottom: 10px;
    font-size: 9px;
  }

  .heatmap-key.black-key {
    width: 18px;
    padding-top: 6px;
    font-size: 7px;
  }

  .heatmap-key-label {
    bottom: 14px;
  }

  .heatmap-key.black-key .heatmap-key-label {
    top: 6px;
    font-size: 7px;
  }
}

@media (max-width: 359px) {
  #screen-analytics .analytics-summary {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  #screen-analytics .analytics-label {
    font-size: 10px;
  }
}

/* ---- 画面別の整理 ---- */
#screen-analytics .analytics-details-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

#screen-analytics .analytics-details-grid .analytics-section {
  padding: 11px 12px;
}

#screen-analytics .analytics-details-grid .analytics-section-title {
  font-size: var(--font-size-base);
}

@media (max-width: 900px) {
  #screen-analytics .analytics-details-grid {
    grid-template-columns: 1fr;
  }
}

#screen-review {
  align-content: flex-start;
}

#screen-review .screen-header {
  flex: 0 0 auto;
}

#screen-review .screen-body {
  box-sizing: border-box;
  width: 100%;
  max-width: 1520px;
  margin: 0 auto;
}

#screen-review #review-content {
  width: 100%;
  max-width: 1440px;
  margin: 0 auto;
}

#screen-review .review-summary {
  min-height: 54px;
  padding: 12px 16px;
  background: linear-gradient(90deg, rgba(255, 248, 231, 0.98), rgba(237, 224, 192, 0.6));
}

#screen-review .review-mode-filters .btn,
#screen-review .review-starts .btn {
  min-height: 40px;
}

#screen-review .review-mode-filters {
  padding: 8px;
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
}

#screen-review .review-starts {
  align-items: center;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--border-light);
}

#screen-review .review-session-list {
  gap: 10px;
}

#screen-review .review-session-card {
  box-shadow: var(--shadow-sm);
}

#screen-settings .settings-scroll {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  align-content: start;
  align-items: start;
}

#screen-settings .settings-section {
  min-width: 0;
  margin: 0;
  padding: 14px;
  background: rgba(255, 248, 231, 0.82);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

#screen-settings .settings-section-title {
  margin-bottom: 8px;
  padding-bottom: 6px;
  font-size: var(--font-size-base);
  font-weight: 800;
}

#screen-settings .settings-row {
  min-height: 38px;
  padding: 6px 0;
}

#screen-settings .settings-hint {
  font-size: var(--font-size-xs);
  line-height: 1.45;
}

#screen-settings .settings-section:has(#settings-bgm-home) > button {
  width: auto;
  min-width: 180px;
  margin: 3px 4px 3px 0;
}

@media (min-width: 768px) and (max-width: 1099px) {
  #screen-settings .settings-scroll {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.home-checkin-footer {
  width: 100%;
  max-width: 720px;
  margin: var(--space-md) auto 0;
}

.home-checkin-footer #home-checkin-card {
  min-height: 72px;
  padding: 10px var(--space-md);
  cursor: pointer;
}

.home-checkin-footer #home-checkin-card .card-icon {
  width: 40px;
  height: 40px;
  font-size: 24px;
}

.session-interrupt-actions {
  flex-direction: column;
  gap: var(--space-sm);
}

.session-interrupt-actions .btn {
  width: 100%;
  min-height: 52px;
  flex: 0 0 auto;
  white-space: normal;
  line-height: 1.35;
}

@media (max-width: 767px) {
  #screen-settings .settings-scroll {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  #screen-settings .settings-section:has(#settings-bgm-home) > button {
    width: 100%;
    margin: 3px 0;
  }

  .home-checkin-footer {
    margin-top: 10px;
  }

  .home-checkin-footer #home-checkin-card {
    min-height: 62px;
  }
}

/* ---- 復習・成績分析と揃えた補助画面レイアウト ---- */
#screen-mode-select,
#screen-midi-test,
#screen-profile {
  align-content: flex-start;
}

#screen-mode-select .screen-header,
#screen-midi-test .screen-header,
#screen-profile .screen-header {
  flex: 0 0 auto;
}

#screen-mode-select .screen-body,
#screen-midi-test .screen-body,
#screen-profile .screen-body {
  box-sizing: border-box;
  width: 100%;
  margin: 0 auto;
}

#screen-mode-select .screen-body {
  max-width: 1520px;
}

#screen-mode-select .mode-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

#screen-mode-select .mode-card {
  min-height: 112px;
  padding: 20px 16px;
}

#screen-mode-select .audio-source-card {
  margin-bottom: 12px;
}

#screen-midi-test .screen-body,
#screen-profile .screen-body {
  max-width: 1100px;
}

#screen-midi-test .midi-status,
#screen-midi-test .midi-devices,
#screen-midi-test #midi-scan-btn,
#screen-midi-test #midi-test-area,
#screen-profile .profile-list,
#screen-profile .profile-create-form,
#screen-profile #profile-add-btn {
  width: 100%;
  max-width: 1040px;
  margin-left: auto;
  margin-right: auto;
  box-sizing: border-box;
}

#screen-midi-test .screen-body {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

#screen-midi-test .midi-status,
#screen-midi-test .midi-devices,
#screen-midi-test #midi-scan-btn,
#screen-midi-test .midi-help-card,
#screen-midi-test #midi-test-area {
  margin-bottom: 0;
}

.midi-help-card {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  width: 100%;
  max-width: 1040px;
  box-sizing: border-box;
  margin-left: auto;
  margin-right: auto;
  padding: 18px 20px;
  background: linear-gradient(135deg, rgba(255, 248, 231, 0.96), rgba(237, 224, 192, 0.76));
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.midi-help-icon {
  display: grid;
  width: 52px;
  height: 52px;
  flex: 0 0 52px;
  place-items: center;
  font-size: 28px;
  background: var(--bg-card);
  border-radius: 14px;
}

.midi-help-content { min-width: 0; }
.midi-help-content h3 { margin: 0 0 4px; font-size: var(--font-size-lg); }
.midi-help-content p { margin: 0; color: var(--text-secondary); }
.midi-help-content ol { display: flex; flex-wrap: wrap; gap: 8px 24px; margin: 10px 0 0; padding-left: 20px; color: var(--text-secondary); font-size: var(--font-size-sm); }

#screen-midi-test .midi-status,
#screen-midi-test #midi-test-area {
  padding: 16px;
  border-radius: var(--radius-md);
}

#screen-midi-test #midi-scan-btn {
  margin-bottom: var(--space-md);
}

#screen-profile .profile-item {
  min-height: 72px;
  box-sizing: border-box;
}

@media (max-width: 767px) {
  #screen-mode-select .screen-body,
  #screen-midi-test .screen-body,
  #screen-profile .screen-body {
    max-width: none;
    padding-left: 12px;
    padding-right: 12px;
  }

  #screen-mode-select .mode-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
  }

  #screen-mode-select .mode-card {
    min-height: 92px;
    padding: 14px 8px;
  }

  #screen-mode-select .audio-source-card {
    margin-bottom: 8px;
  }

  #screen-midi-test .midi-status,
  #screen-midi-test #midi-test-area,
  #screen-midi-test .midi-help-card {
    padding: 12px;
  }

  .midi-help-card { gap: 10px; }
  .midi-help-icon { width: 42px; height: 42px; flex-basis: 42px; font-size: 22px; }
  .midi-help-content h3 { font-size: var(--font-size-base); }
  .midi-help-content ol { display: block; margin-top: 8px; }
  .midi-help-content li + li { margin-top: 4px; }
}

/* ---- コード名選択の選択状態 ---- */
#screen-session .chord-root-btn.choice-active,
#screen-session .chord-type-btn.choice-active,
#screen-session .inversion-btn.choice-active {
  background: var(--accent-primary);
  color: var(--text-on-primary);
  border-color: var(--accent-primary);
  box-shadow: 0 0 0 3px rgba(139, 111, 74, 0.22), var(--shadow-sm);
  transform: translateY(-1px);
}

#screen-session .chord-root-btn.choice-active:hover,
#screen-session .chord-type-btn.choice-active:hover,
#screen-session .inversion-btn.choice-active:hover {
  background: var(--accent-primary-light);
}