@import url('https://fonts.googleapis.com/css2?family=M+PLUS+Rounded+1c:wght@400;500;700&family=JetBrains+Mono:wght@400;500&display=swap');

/*
 * style.css — テーマ・共通 UI・PC レイアウト・タップゾーン定義
 * モバイルのプレイ画面シェル（HUD / ボード枠 / HOLD）は game-shell.css（style の直後に読込）
 */

/* ========== ライトテーマ（海＋砂浜） ========== */
:root {
  --board-bg: linear-gradient(160deg, #e8f3f8 0%, #d4e8f2 100%);
  --score-keys-shadow: none;
  --primary: #5AB2FF;
  --primary-hover: #3d9ae8;
  --secondary: #A0DEFF;
  --accent: #CAF4FF;
  --success: #5AB2FF;
  --danger: #c53030;
  --warning: #c9a86c;
  --sand: #f5f0e8;
  --sand-light: #f0e9df;
  --sand-dark: #e8dcc8;
  --dark: #f5f0e8;
  --dark-light: #f0e9df;
  --dark-lighter: #e8dcc8;
  --text: #2c3e50;
  --text-muted: #5a6c7d;
  --border: #b8e4ff;
  --glass: rgba(255, 255, 255, 0.88);
  --glass-border: rgba(90, 178, 255, 0.28);
  --shadow: 0 4px 20px rgba(44, 62, 80, 0.08);
  --glow-primary: none;
  --glow-secondary: none;
  --bg-gradient-1: rgba(202, 244, 255, 0.4);
  --bg-gradient-2: rgba(160, 222, 255, 0.2);
  --bg-gradient-3: rgba(232, 220, 200, 0.25);
  --bg-gradient-4: rgba(201, 168, 108, 0.12);
  --modal-overlay: rgba(44, 62, 80, 0.55);
  --demo-rotate: rgba(90, 178, 255, 0.2);
  --demo-lr: rgba(160, 222, 255, 0.25);
  --demo-down: rgba(201, 168, 108, 0.2);
}

/* ========== ダークテーマ（深海ネイビー・洗練） ========== */
body.theme-dark {
  --board-bg: linear-gradient(165deg, #0c2545 0%, #0e3460 45%, #071628 100%);
  --primary: #2dd4bf;
  --primary-hover: #5eead4;
  --secondary: #94a3b8;
  --accent: #2dd4bf;
  --success: #34d399;
  --danger: #f87171;
  --warning: #fbbf24;
  --dark: #0f172a;
  --dark-light: #1e293b;
  --dark-lighter: #334155;
  --text: #f8fafc;
  --text-muted: #94a3b8;
  --border: #475569;
  --glass: rgba(15, 23, 42, 0.9);
  --glass-border: rgba(45, 212, 191, 0.25);
  --shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  --glow-primary: 0 0 20px rgba(45, 212, 191, 0.2);
  --glow-secondary: none;
  --modal-overlay: rgba(0, 0, 0, 0.92);
  --bg-gradient-1: rgba(45, 212, 191, 0.08);
  --bg-gradient-2: rgba(100, 116, 139, 0.1);
  --bg-gradient-3: rgba(45, 212, 191, 0.05);
  --bg-gradient-4: rgba(100, 116, 139, 0.06);
  --score-keys-shadow: 0 0 14px rgba(45, 212, 191, 0.6), 0 0 28px rgba(45, 212, 191, 0.2);
  --demo-rotate: rgba(45, 212, 191, 0.35);
  --demo-lr: rgba(93, 173, 226, 0.35);
  --demo-down: rgba(110, 231, 183, 0.35);
}

/* バージョン表示（目視確認用） */
.app-version {
  margin-top: 16px;
  margin-bottom: 0;
  font-size: 0.75rem;
  color: var(--text-muted);
  text-align: center;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
  -webkit-user-select: none;
  user-select: none;
}

body {
  font-family: 'M PLUS Rounded 1c', sans-serif;
  background: var(--dark); /* ★修正: 純黒背景 */
  color: var(--text);
  height: 100vh;
  height: 100dvh; /* iPhone 検索バー考慮 */
  overflow: hidden;
  position: fixed;
  width: 100%;
}

/* 海モチーフ背景（テーマでグラデ変化） */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background:
    radial-gradient(circle at 20% 20%, var(--bg-gradient-1) 0%, transparent 45%),
    radial-gradient(circle at 80% 80%, var(--bg-gradient-2) 0%, transparent 45%),
    radial-gradient(circle at 50% 50%, var(--bg-gradient-3) 0%, transparent 55%),
    radial-gradient(circle at 70% 30%, var(--bg-gradient-4) 0%, transparent 40%);
  pointer-events: none;
  z-index: -1;
}

/* 画面管理 — safe-area はここだけ（子コンポーネントでは env を増やさない） */
.screen {
  display: none;
  height: 100vh;
  height: 100dvh;
  width: 100vw;
  position: absolute;
  top: 0;
  left: 0;
  box-sizing: border-box;
  padding-top: env(safe-area-inset-top, 0px);
  padding-right: env(safe-area-inset-right, 0px);
  padding-bottom: env(safe-area-inset-bottom, 0px);
  padding-left: env(safe-area-inset-left, 0px);
}

.screen.active {
  display: flex;
}

/* ========== スタート画面（1ページ目） ========== */
#start-screen {
  align-items: flex-start;
  justify-content: center;
  padding: 15px;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.start-container {
  max-width: 900px;
  width: 100%;
  text-align: center;
  padding-bottom: 20px;
}

.title-section {
  margin-bottom: 25px;
  /* ステータスバー直下の圧迫感を減らす（.screen の safe-area に加算） */
  padding-top: clamp(18px, 5vmin, 40px);
}

.title-section h1 {
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 700;
  margin-bottom: 15px;
  letter-spacing: 0.02em;
  font-family: 'M PLUS Rounded 1c', sans-serif;
  color: #fff;
  -webkit-text-stroke: 3px #3d6b8a;
  paint-order: stroke fill;
}

.subtitle {
  font-size: clamp(1.1rem, 2.5vw, 1.3rem);
  color: var(--text-muted);
  line-height: 1.5;
}

.rules-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-bottom: 25px;
}

.start-actions {
  display: block;
}

.rule-card {
  background: var(--glass);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: 16px;
  padding: 18px;
  box-shadow: var(--shadow);
}

.rule-card h3 {
  color: var(--text);
  font-size: 1.2rem;
  margin-bottom: 15px;
  font-weight: 600;
}

.rule-card-wide {
  grid-column: 1 / -1;
}

.how-to-play {
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--text);
}
.how-to-play p {
  margin: 0 0 10px 0;
}
.how-to-play p:last-child {
  margin-bottom: 0;
}
.how-to-play strong {
  color: var(--text);
  font-weight: 600;
}

.controls-compact {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.control-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 8px 0;
}

.control-desc {
  font-size: 0.95rem;
  color: var(--text);
}

.control-keys {
  display: flex;
  gap: 8px;
  align-items: center;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.key {
  background: var(--dark-lighter);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 8px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text);
}

.score-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.score-item {
  display: flex;
  justify-content: space-between;
  padding: 5px 0;
  font-size: 0.95rem;
}

.score-item span {
  font-family: 'JetBrains Mono', monospace;
  color: var(--warning);
  font-weight: 500;
}

.mobile-only {
  display: none;
}

/* ========== ボタンコンポーネント（使い回し） ========== */
.btn {
  box-sizing: border-box;
  cursor: pointer;
  font-family: inherit;
  font-weight: 600;
  text-transform: none;
  transition: background 0.2s, color 0.2s, border-color 0.2s, transform 0.2s, box-shadow 0.2s;
  border-radius: 12px;
}
.btn-primary {
  background: #fff;
  color: #3d6b8a;
  border: 2px solid #3d6b8a;
  padding: 18px 40px;
  font-size: 1.2rem;
  box-shadow: var(--shadow);
}
.btn-primary:hover {
  background: rgba(61, 107, 138, 0.08);
  border-color: #345f7a;
  color: #345f7a;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(61, 107, 138, 0.15);
}
body.theme-dark .btn-primary {
  background: var(--glass);
  color: var(--primary);
  border-color: var(--primary);
}
body.theme-dark .btn-primary:hover {
  background: rgba(96, 165, 250, 0.12);
  color: var(--primary);
  border-color: var(--primary);
}

.btn-secondary {
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--glass-border);
  padding: 12px 24px;
  font-size: 1rem;
  font-weight: 500;
}
.btn-secondary:hover {
  background: var(--glass);
  color: var(--text);
  border-color: #3d6b8a;
}
body.theme-dark .btn-secondary:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.btn-danger {
  background: #fff;
  color: #c53030;
  border: 2px solid #c53030;
  padding: 14px 20px;
  font-size: 0.95rem;
  border-radius: 8px;
  box-shadow: var(--shadow);
}
.btn-danger:hover {
  background: rgba(197, 48, 48, 0.08);
  border-color: #9a2a2a;
  color: #9a2a2a;
  transform: translateY(-1px);
}
body.theme-dark .btn-danger {
  background: var(--glass);
  color: var(--danger);
  border-color: var(--danger);
}
body.theme-dark .btn-danger:hover {
  background: var(--dark-lighter);
  filter: brightness(1.08);
}

/* 成功・再挑戦系（青系だが primary より柔らかめ） */
.btn-success {
  background: #fff;
  color: #6b9dc4;
  border: 1px solid #6b9dc4;
  padding: 14px 20px;
  font-size: 0.95rem;
  border-radius: 8px;
  box-shadow: var(--shadow);
}
.btn-success:hover {
  background: rgba(107, 157, 196, 0.08);
  border-color: #5a8fb8;
  color: #5a8fb8;
}
body.theme-dark .btn-success {
  background: var(--glass);
  color: var(--success);
  border-color: var(--success);
}
body.theme-dark .btn-success:hover {
  background: var(--dark-lighter);
  border-color: var(--primary-hover);
  color: var(--primary-hover);
}

/* 小さいボタン（一時停止アイコン等） */
.btn-sm {
  padding: 10px 16px;
  font-size: 0.95rem;
  border-radius: 8px;
}

.start-btn {
  margin-top: 32px;
}
.tutorial-btn {
  margin-top: 12px;
}

/* スタート画面ボタン：デスクトップのみ（ラベルが収まるよう最小幅・パディング調整） */
@media (min-width: 769px) {
  .start-actions {
    display: flex;
    justify-content: center;
    align-items: stretch;
    gap: 16px;
    margin-top: 20px;
    flex-wrap: wrap;
    width: 100%;
    max-width: 580px;
    margin-left: auto;
    margin-right: auto;
  }
  .start-actions .start-btn,
  .start-actions .tutorial-btn,
  .start-actions .settings-btn {
    margin-top: 0;
    flex: 1 1 0;
    min-width: 0;
    white-space: nowrap;
    padding-left: 24px;
    padding-right: 24px;
  }
  #start-screen .rules-grid {
    grid-template-columns: 1fr 1fr;
    margin-bottom: 20px;
  }
}

/* 難易度選択 */
.difficulty-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  width: 100%;
  max-width: 360px;
  margin-top: 32px;
}
.difficulty-label {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
}
.difficulty-selector {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: center;
  width: 100%;
}
.difficulty-option {
  flex: 1;
  min-width: 100px;
  padding: 10px 18px;
  border-radius: 10px;
  border: 2px solid var(--glass-border);
  background: var(--glass);
  color: var(--text);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s, color 0.2s;
  text-align: center;
  white-space: nowrap;
}
.difficulty-option:hover {
  border-color: #3d6b8a;
  color: #3d6b8a;
  background: rgba(61, 107, 138, 0.06);
}
.difficulty-option.active {
  border-color: #3d6b8a;
  background: #e0eef6;
  color: #2d5a75;
}
body.theme-dark .difficulty-option.active {
  border-color: var(--primary);
  background: rgba(96, 165, 250, 0.2);
  color: var(--primary);
}

/* 難易度選択画面（中間画面） */
#difficulty-screen {
  align-items: center;
  justify-content: center;
  padding: 20px;
}
.difficulty-screen-container {
  max-width: 480px;
  width: 100%;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 32px;
}
.difficulty-screen-title {
  font-size: clamp(1.25rem, 3vw, 1.5rem);
  font-weight: 600;
  color: var(--text);
  margin: 0;
}
.difficulty-section-centered {
  margin-left: auto;
  margin-right: auto;
  margin-top: 0;
}
.difficulty-screen-buttons {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  width: 100%;
  max-width: 320px;
}
.difficulty-screen-buttons .start-btn {
  margin-top: 0;
  width: 100%;
}

/* 難易度選択：デスクトップで大きく表示 */
@media (min-width: 769px) {
  #difficulty-screen .difficulty-screen-container {
    max-width: 760px;
    gap: 48px;
  }
  #difficulty-screen .difficulty-screen-title {
    font-size: 1.9rem;
  }
  #difficulty-screen .difficulty-section {
    max-width: 560px;
  }
  #difficulty-screen .difficulty-option {
    padding: 18px 32px;
    font-size: 1.15rem;
  }
  #difficulty-screen .difficulty-screen-buttons {
    max-width: 460px;
    gap: 24px;
  }
  #difficulty-screen .difficulty-screen-buttons .start-btn {
    padding: 24px 56px;
    font-size: 1.35rem;
  }
  #difficulty-screen .back-from-difficulty-btn {
    padding: 16px 32px;
    font-size: 1.1rem;
  }
}

/* チュートリアル画面 */
#tutorial-screen {
  align-items: center;
  justify-content: center;
  padding: 8px;
  box-sizing: border-box;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}
.tutorial-layout {
  max-width: 420px;
  width: 100%;
  max-height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  box-sizing: border-box;
}
.tutorial-step-indicator {
  font-size: 0.85rem;
  font-weight: 700;
  color: #3d6b8a;
  margin: 0;
  text-align: center;
  line-height: 1.2;
  flex-shrink: 0;
}
body.theme-dark .tutorial-step-indicator {
  color: var(--primary);
}
.tutorial-instruction {
  font-size: 0.85rem;
  line-height: 1.35;
  color: var(--text);
  margin: 0;
  text-align: center;
  min-height: 1.8em;
  flex-shrink: 0;
}
.tutorial-game-wrap {
  flex: 0 0 auto;
  width: fit-content;
  height: fit-content;
  max-width: 100%;
  max-height: min(520px, 76dvh);
  margin: 0 auto;
  display: block;
}
.tutorial-game-wrap .game-area {
  position: relative;
  display: inline-block;
}
/* チュートリアル用キャンバス：枠のぶれ防止（box-shadow なし・レイヤー化） */
#tutorial-screen #tutorial-canvas {
  display: block;
  box-shadow: none;
  transform: translateZ(0);
}
/* チュートリアルではプレイ領域を本番と同じに見せ、タップゾーンを常に表示してラベルで説明 */
.tutorial-game-wrap .tap-zones-tutorial {
  display: block;
  pointer-events: auto;
}
.tutorial-game-wrap .tap-zones-tutorial .tutorial-zone-label {
  position: absolute;
  bottom: 4px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 0.65rem;
  color: rgba(255,255,255,0.8);
  background: rgba(0,0,0,0.5);
  padding: 2px 5px;
  border-radius: 4px;
  pointer-events: none;
}
.tutorial-game-wrap .tap-zones-tutorial .tap-rotate .tutorial-zone-label {
  bottom: auto;
  top: 4px;
}
.tutorial-game-wrap .tap-zones-tutorial .tap-down .tutorial-zone-label {
  bottom: 4px;
}
/* 現在のステップで使うゾーンをハイライト */
.tutorial-layout[data-step="move"] .tap-zones-tutorial .tap-left,
.tutorial-layout[data-step="move"] .tap-zones-tutorial .tap-right {
  box-shadow: inset 0 0 0 3px rgba(61, 107, 138, 0.6);
}
.tutorial-layout[data-step="rotate"] .tap-zones-tutorial .tap-rotate {
  box-shadow: inset 0 0 0 3px rgba(61, 107, 138, 0.6);
}
.tutorial-layout[data-step="drop"] .tap-zones-tutorial .tap-down {
  box-shadow: inset 0 0 0 3px rgba(61, 107, 138, 0.6);
}
.tutorial-layout[data-step="lineCleared"] .tap-zones-tutorial .tap-zone {
  box-shadow: inset 0 0 0 2px rgba(61, 107, 138, 0.3);
}
.tutorial-actions {
  width: 100%;
  display: flex;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 20px;
}

/* チュートリアル：デスクトップで大きく表示 */
@media (min-width: 769px) {
  #tutorial-screen .tutorial-layout {
    max-width: 600px;
  }
  #tutorial-screen .tutorial-game-wrap {
    max-height: min(560px, 70dvh);
  }
}

/* ========== ゲーム画面（3ページ目） ========== */
#game-screen {
  align-items: stretch;
  justify-content: center;
}

/* PC版レイアウト */
.game-layout-pc {
  display: grid;
  grid-template-columns: 200px 1fr 160px;
  gap: 20px;
  width: 100%;
  max-width: 800px;
  height: 100vh;
  padding: 20px;
  align-items: center;
}

/* 大画面（16:9等）でゲームを少し大きく表示 */
@media (min-width: 1400px) {
  #game-screen {
    overflow: visible;
  }
  .game-layout-pc {
    transform: scale(1.2);
    transform-origin: center center;
  }
}

.left-panel, .right-panel {
  display: flex;
  flex-direction: column;
  height: fit-content;
}

.score-panel {
  background: var(--glass);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 20px;
  box-shadow: var(--shadow);
}

/* 一時停止ボタン（PC） */
.left-panel .pause-btn {
  margin-top: 12px;
  width: 100%;
}
.pause-btn .pause-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.pause-btn .pause-icon svg {
  display: block;
}

.score-item {
  display: flex;
  flex-direction: column;
  margin-bottom: 16px;
}

.score-item:last-child {
  margin-bottom: 0;
}

.score-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.score-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text);
  text-shadow: var(--score-keys-shadow);
}

.center-game {
  display: flex;
  justify-content: center;
  align-items: center;
}

.game-area {
  position: relative;
}

/* #mobile-game の枠線は css/game-shell.css（PC は 3px のまま） */
#game,
#tutorial-canvas {
  border: 3px solid var(--secondary);
  border-radius: 8px;
  box-shadow: var(--glow-primary), var(--shadow);
  background: transparent;
}

.next-panel {
  background: var(--glass);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 16px;
  box-shadow: var(--shadow);
}

.next-panel h4 {
  color: var(--secondary);
  font-size: 0.9rem;
  text-align: center;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 1px;
  text-shadow: var(--glow-primary);
}

.next-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: center;
}

.next-list canvas {
  border: 1px solid var(--border);
  border-radius: 4px;
  background: #000;
  box-shadow: var(--shadow);
}

.hold-panel {
  background: var(--glass);
  backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: 12px;
  padding: 16px;
  box-shadow: var(--shadow);
  margin-bottom: 12px;
}

.hold-panel h4 {
  color: var(--secondary);
  font-size: 0.9rem;
  text-align: center;
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 1px;
  text-shadow: var(--glow-primary);
}

.hold-panel canvas {
  display: block;
  margin: 0 auto;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: #000;
  box-shadow: var(--shadow);
}

.hold-btn-mobile {
  padding: 4px 8px;
  font-size: 0.75rem;
  min-height: 32px;
  background: var(--glass);
  border: 1px solid var(--glass-border);
  color: var(--text);
  border-radius: 8px;
}

.hold-btn-mobile:active {
  background: var(--primary);
  color: #fff;
}

/* タップゾーン（レイアウトは変数で一元管理・最小タッチサイズ 44px） */
.tap-zones {
  --tap-top-h: 20%;
  --tap-bottom-h: 20%;
  --tap-mid-h: 60%;
  --tap-side-w: 30%;
  --tap-min-px: 44px;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 10;
  display: none;
}

.tap-zone {
  position: absolute;
  touch-action: manipulation;
}

.tap-rotate {
  top: 0;
  left: 0;
  width: 100%;
  height: var(--tap-top-h);
  min-height: var(--tap-min-px);
}

.tap-left {
  top: var(--tap-top-h);
  left: 0;
  width: var(--tap-side-w);
  min-width: var(--tap-min-px);
  height: var(--tap-mid-h);
  min-height: var(--tap-min-px);
}

.tap-right {
  top: var(--tap-top-h);
  right: 0;
  width: var(--tap-side-w);
  min-width: var(--tap-min-px);
  height: var(--tap-mid-h);
  min-height: var(--tap-min-px);
}

.tap-down {
  bottom: 0;
  left: 0;
  width: 100%;
  height: var(--tap-bottom-h);
  min-height: var(--tap-min-px);
}

/* モバイルプレイシェル（HUD・ボード枠・HOLD）は css/game-shell.css */

/* スマホで文字を大きく（拡大しなくても読みやすく） */
@media (max-width: 768px) {
  #start-screen .how-to-play p {
    font-size: 1.05rem;
    line-height: 1.5;
  }
  #start-screen .control-desc {
    font-size: 1rem;
  }
  #start-screen .control-keys,
  #start-screen .key {
    font-size: 0.95rem;
  }
  #start-screen .rule-card .score-item {
    font-size: 1rem;
  }
  #tutorial-screen .tutorial-step-indicator {
    font-size: 1rem;
  }
  #tutorial-screen .tutorial-instruction {
    font-size: 1rem;
    line-height: 1.4;
  }
}

/* モーダル */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  height: 100dvh;
  background: var(--modal-overlay);
  backdrop-filter: blur(20px);
  z-index: 1000;
  align-items: center;
  justify-content: center;
}

.modal.show {
  display: flex;
}

/* ステージクリアトースト（下部表示でゲームエリアを覆わない） */
.stage-clear-toast {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1100;
  padding: 16px 32px;
  border-radius: 12px;
  border: 2px solid #3d6b8a;
  background: var(--glass);
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow);
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s, visibility 0.25s, transform 0.25s;
}
.stage-clear-toast.show {
  opacity: 1;
  visibility: visible;
  animation: stageClearPop 0.4s ease-out;
}
.stage-clear-text {
  font-size: 1.25rem;
  font-weight: 700;
  color: #3d6b8a;
}
body.theme-dark .stage-clear-text {
  color: var(--primary);
}
@keyframes stageClearPop {
  0% { transform: translateX(-50%) scale(0.8); opacity: 0; }
  60% { transform: translateX(-50%) scale(1.05); opacity: 1; }
  100% { transform: translateX(-50%) scale(1); opacity: 1; }
}
@media (max-width: 768px) {
  .stage-clear-toast {
    bottom: 1rem;
    padding: 10px 20px;
    border-radius: 10px;
  }
  .stage-clear-text {
    font-size: 1rem;
  }
}

/* PWA更新案内トースト（画面上部） */
.update-toast {
  position: fixed;
  top: max(0.75rem, calc(env(safe-area-inset-top, 0px) + 0.5rem));
  left: 50%;
  transform: translateX(-50%);
  z-index: 1200;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px 12px;
  box-sizing: border-box;
  width: min(420px, calc(100vw - 16px - env(safe-area-inset-left, 0px) - env(safe-area-inset-right, 0px)));
  max-width: 100%;
  padding: 12px 16px;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
  border-radius: 12px;
  border: 2px solid var(--primary);
  background: var(--glass);
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s, visibility 0.25s;
}
.update-toast.show {
  opacity: 1;
  visibility: visible;
}
.update-toast-text {
  flex: 1 1 12rem;
  min-width: 0;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  text-align: center;
  line-height: 1.35;
}
.update-reload-btn {
  flex-shrink: 0;
}

.modal-content {
  background: #fff;
  backdrop-filter: blur(20px);
  border: 2px solid #3d6b8a;
  border-radius: 20px;
  padding: 40px;
  text-align: center;
  box-shadow: var(--shadow);
  max-width: 400px;
  width: 90%;
  position: relative;
}

body.theme-dark .modal-content {
  background: var(--glass);
  border-color: var(--glass-border);
}

.modal-content h2 {
  font-size: 1.6rem;
  margin-bottom: 24px;
  color: #3d6b8a;
  font-weight: 700;
}

body.theme-dark .modal-content h2 {
  color: var(--text);
}

.menu-buttons {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 16px;
}

.menu-buttons .btn {
  width: 100%;
}

.menu-hint {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin: 0;
}

.menu-hint-mobile {
  display: none;
}

body.mobile-device .menu-hint-pc {
  display: none;
}

body.mobile-device .menu-hint-mobile {
  display: block;
}

/* 設定モーダル（表示・音量） */
.settings-modal-content {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 20px;
  min-width: 280px;
  max-width: 360px;
}
.settings-modal-content h2 {
  margin-bottom: 0;
}
.settings-section {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.settings-section-title {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-muted);
  margin: 0 0 4px 0;
}
.settings-theme-row {
  display: flex;
  gap: 12px;
}
.theme-option-btn {
  flex: 1;
}
.theme-option-btn[aria-pressed="true"] {
  border-color: var(--primary);
  background: rgba(90, 178, 255, 0.15);
  color: var(--primary);
}
body.theme-dark .theme-option-btn[aria-pressed="true"] {
  background: rgba(45, 212, 191, 0.2);
  color: var(--primary);
}
.volume-controls {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.volume-row {
  display: flex;
  align-items: center;
  gap: 12px;
}
.volume-row label {
  flex-shrink: 0;
  width: 4.5em;
  font-size: 0.95rem;
  color: var(--text);
  font-weight: 500;
}
.volume-slider {
  flex: 1;
  min-width: 0;
  height: 8px;
  accent-color: var(--primary);
}
.volume-value {
  flex-shrink: 0;
  min-width: 3em;
  text-align: right;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
}
.close-settings-btn {
  align-self: center;
  margin-top: 8px;
}
.settings-btn {
  margin-top: 12px;
}

.result-stats {
  display: flex;
  justify-content: space-around;
  margin-bottom: 24px;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.stat-value {
  font-family: 'JetBrains Mono', monospace;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text);
  text-shadow: var(--score-keys-shadow);
}

/* ★修正: レスポンシブ - iPhone14最適化 */
@media (max-width: 768px) {
  body {
    overflow: auto;
    position: static;
  }

  #start-screen {
    height: auto;
    min-height: 100vh;
    min-height: 100dvh;
    overflow-y: visible;
    position: relative;
  }

  /* モバイル: 縦いっぱいに張り付け、safe-area の外側もベース色で見切れを減らす */
  #game-screen {
    height: 100vh !important;
    height: 100dvh !important;
    overflow: hidden !important;
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    width: 100vw !important;
    justify-content: stretch !important;
    align-items: stretch !important;
    background: var(--dark);
  }

  body.game-active {
    overflow: hidden !important;
    position: fixed !important;
    width: 100% !important;
    height: 100% !important;
    touch-action: manipulation;
  }

  .mobile-only {
    display: block;
  }

  .tap-area-demo {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: 1fr 1fr;
    gap: 8px;
    height: 120px;
    border: 2px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: var(--shadow);
  }

  .demo-area {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-muted);
  }

  .demo-rotate {
    background: var(--demo-rotate);
    grid-column: 1 / -1;
  }

  .demo-left {
    background: var(--demo-lr);
  }

  .demo-right {
    background: var(--demo-lr);
  }

  .demo-down {
    background: var(--demo-down);
    grid-column: 1 / -1;
  }

  .game-layout-pc {
    display: none;
  }

  .tap-zones {
    display: block;
    --tap-side-w: 38%;
  }

  .rules-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .start-actions .start-btn,
  .start-actions .tutorial-btn,
  .start-actions .settings-btn {
    width: 100%;
    max-width: 300px;
    padding-left: 20px;
    padding-right: 20px;
  }
}

/* ★修正: 小画面対応 */
@media (max-width: 480px) {
  .rule-card {
    padding: 20px;
  }

  .title-section h1 {
    font-size: 2.5rem;
  }
}