/* ===========================
   CSS変数 - テーマシステム
   =========================== */

/* 和紙風テーマ（デフォルト） */
[data-theme="washi"] {
  --bg-primary: #f0ebe0;
  --bg-secondary: #e6dfd0;
  --bg-card: #faf6ee;
  --text-primary: #3a3025;
  --text-secondary: #7a6b5a;
  --accent: #8b4513;
  --accent-hover: #a0522d;
  --border: #cfc0a0;
  --btn-primary-bg: #8b4513;
  --btn-primary-text: #faf6ee;
  --btn-secondary-bg: #d4c5a9;
  --btn-secondary-text: #3a3025;
  --btn-danger-bg: #7a2020;
  --btn-danger-text: #faf6ee;
  --highlight-bg: #8b4513;
  --highlight-text: #faf6ee;
  --locked-bg: #5a7a3a;
  --locked-text: #faf6ee;
  --result-bg: #faf6ee;
  --result-border: #8b4513;
  --input-bg: #faf6ee;
  --input-border: #cfc0a0;
  --toggle-bg: #cfc0a0;
  --toggle-active: #8b4513;
  --shadow: rgba(58, 48, 37, 0.12);
  --display-bg: #e6dfd0;
}

/* 森テーマ */
[data-theme="mori"] {
  --bg-primary: #0e1810;
  --bg-secondary: #162012;
  --bg-card: #1e2c18;
  --text-primary: #c8d8b8;
  --text-secondary: #8aaa78;
  --accent: #c8922a;
  --accent-hover: #e0a840;
  --border: #2e4028;
  --btn-primary-bg: #c8922a;
  --btn-primary-text: #0e1810;
  --btn-secondary-bg: #2e4028;
  --btn-secondary-text: #c8d8b8;
  --btn-danger-bg: #8b2020;
  --btn-danger-text: #c8d8b8;
  --highlight-bg: #c8922a;
  --highlight-text: #0e1810;
  --locked-bg: #3a7a3a;
  --locked-text: #c8d8b8;
  --result-bg: #1e2c18;
  --result-border: #c8922a;
  --input-bg: #162012;
  --input-border: #2e4028;
  --toggle-bg: #2e4028;
  --toggle-active: #c8922a;
  --shadow: rgba(0, 0, 0, 0.3);
  --display-bg: #162012;
}

/* 藍染テーマ */
[data-theme="aizome"] {
  --bg-primary: #0c111e;
  --bg-secondary: #141a2c;
  --bg-card: #1c2438;
  --text-primary: #d0daf0;
  --text-secondary: #8090b8;
  --accent: #c8a848;
  --accent-hover: #e0c060;
  --border: #263050;
  --btn-primary-bg: #c8a848;
  --btn-primary-text: #0c111e;
  --btn-secondary-bg: #263050;
  --btn-secondary-text: #d0daf0;
  --btn-danger-bg: #7a2030;
  --btn-danger-text: #d0daf0;
  --highlight-bg: #c8a848;
  --highlight-text: #0c111e;
  --locked-bg: #2a6060;
  --locked-text: #d0daf0;
  --result-bg: #1c2438;
  --result-border: #c8a848;
  --input-bg: #141a2c;
  --input-border: #263050;
  --toggle-bg: #263050;
  --toggle-active: #c8a848;
  --shadow: rgba(0, 0, 0, 0.35);
  --display-bg: #141a2c;
}

/* ダークテーマ */
[data-theme="dark"] {
  --bg-primary: #1a1a2e;
  --bg-secondary: #16213e;
  --bg-card: #0f3460;
  --text-primary: #e0e0e0;
  --text-secondary: #a0a0a0;
  --accent: #e94560;
  --accent-hover: #ff6b81;
  --border: #2a2a4a;
  --btn-primary-bg: #e94560;
  --btn-primary-text: #ffffff;
  --btn-secondary-bg: #2a2a4a;
  --btn-secondary-text: #e0e0e0;
  --btn-danger-bg: #c0392b;
  --btn-danger-text: #ffffff;
  --highlight-bg: #e94560;
  --highlight-text: #ffffff;
  --locked-bg: #2e7d4a;
  --locked-text: #ffffff;
  --result-bg: #0f3460;
  --result-border: #e94560;
  --input-bg: #16213e;
  --input-border: #2a2a4a;
  --toggle-bg: #2a2a4a;
  --toggle-active: #e94560;
  --shadow: rgba(0, 0, 0, 0.3);
  --display-bg: #16213e;
}

/* メタルテーマ */
[data-theme="metal"] {
  --bg-primary: #0a0a0a;
  --bg-secondary: #1a1a1a;
  --bg-card: #2a2a2a;
  --text-primary: #d0d0d0;
  --text-secondary: #888888;
  --accent: #cc0000;
  --accent-hover: #ff3333;
  --border: #444444;
  --btn-primary-bg: #cc0000;
  --btn-primary-text: #ffffff;
  --btn-secondary-bg: #3a3a3a;
  --btn-secondary-text: #d0d0d0;
  --btn-danger-bg: #8b0000;
  --btn-danger-text: #ffffff;
  --highlight-bg: #cc0000;
  --highlight-text: #ffffff;
  --locked-bg: #2a6a2a;
  --locked-text: #ffffff;
  --result-bg: #1a1a1a;
  --result-border: #cc0000;
  --input-bg: #1a1a1a;
  --input-border: #444444;
  --toggle-bg: #3a3a3a;
  --toggle-active: #cc0000;
  --shadow: rgba(204, 0, 0, 0.2);
  --display-bg: #1a1a1a;
}

/* ネオンサイバーテーマ */
[data-theme="neon"] {
  --bg-primary: #0d0221;
  --bg-secondary: #150734;
  --bg-card: #1a0a3e;
  --text-primary: #e0e0ff;
  --text-secondary: #8888cc;
  --accent: #00ff88;
  --accent-hover: #33ffaa;
  --border: #2a1a5e;
  --btn-primary-bg: #00ff88;
  --btn-primary-text: #0d0221;
  --btn-secondary-bg: #2a1a5e;
  --btn-secondary-text: #e0e0ff;
  --btn-danger-bg: #ff0055;
  --btn-danger-text: #ffffff;
  --highlight-bg: #ff0055;
  --highlight-text: #ffffff;
  --locked-bg: #006644;
  --locked-text: #e0e0ff;
  --result-bg: #1a0a3e;
  --result-border: #00ff88;
  --input-bg: #150734;
  --input-border: #2a1a5e;
  --toggle-bg: #2a1a5e;
  --toggle-active: #00ff88;
  --shadow: rgba(0, 255, 136, 0.15);
  --display-bg: #150734;
}

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

/* hidden属性をdisplay指定より優先させる */
[hidden] { display: none !important; }

body {
  font-family: 'Segoe UI', 'Hiragino Kaku Gothic ProN', 'メイリオ', sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  transition: background-color 0.3s, color 0.3s;
}

/* ===========================
   ヘッダー
   =========================== */
.app-header {
  text-align: center;
  padding: 1.2rem 1rem 1rem;
  background-color: var(--bg-secondary);
  border-bottom: 2px solid var(--border);
}

.app-header h1 {
  font-size: 1.6rem;
  color: var(--accent);
}

.subtitle {
  color: var(--text-secondary);
  font-size: 0.85rem;
  margin-top: 0.2rem;
}

/* ===========================
   メインレイアウト
   =========================== */
.app-main {
  max-width: 700px;
  margin: 0 auto;
  padding: 1rem;
}

.app-main section {
  background-color: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.25rem;
  margin-bottom: 1rem;
  box-shadow: 0 2px 8px var(--shadow);
}

.app-main h2 {
  font-size: 1rem;
  margin-bottom: 0.75rem;
  color: var(--accent);
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.4rem;
}

/* ===========================
   メトロノーム表示（BPM・拍インジケーター）
   =========================== */
.tempo-display {
  text-align: center;
  padding: 1.2rem 1rem 0.9rem;
  margin-bottom: 1rem;
  background-color: var(--display-bg);
  border: 2px solid var(--border);
  border-radius: 8px;
  transition: border-color 0.2s;
}

.metronome-section.playing .tempo-display {
  border-color: var(--accent);
}

.bpm-display {
  font-size: clamp(4rem, 18vw, 6rem);
  font-weight: 700;
  line-height: 1;
  color: var(--text-primary);
  font-variant-numeric: tabular-nums;
  transition: color 0.15s;
}

/* 拍ごとのフラッシュ（強拍 = アクセント色、その他 = サブ色） */
.bpm-display.beat-flash {
  color: var(--locked-bg);
  transition: none;
}

.bpm-display.beat-flash-strong {
  color: var(--accent);
  transition: none;
}

.bpm-label {
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  color: var(--text-secondary);
  margin-top: 0.2rem;
}

.tempo-name {
  font-size: 0.85rem;
  font-style: italic;
  color: var(--accent);
  min-height: 1.4em;
}

/* 拍インジケーター（縦バーの高さ = アクセント段階） */
.beat-dots {
  display: flex;
  justify-content: center;
  align-items: flex-end;
  gap: 6px;
  height: 52px;
  margin-top: 0.9rem;
}

.beat-dot {
  flex: 1 1 0;
  max-width: 36px;
  min-width: 0;
  height: 100%;
  display: flex;
  align-items: flex-end;
  padding: 0;
  background: none;
  border: none;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

/* 変則拍子のグループ頭の前にすき間を入れて区切りを見せる */
.beat-dot.group-start {
  margin-left: 8px;
}

.beat-fill {
  display: block;
  width: 100%;
  border-radius: 4px;
  background-color: var(--btn-secondary-bg);
  transition: background-color 0.06s linear, box-shadow 0.06s linear, opacity 0.06s linear;
}

.beat-dot[data-level="3"] .beat-fill { height: 100%; background-color: var(--accent); opacity: 0.45; }
.beat-dot[data-level="2"] .beat-fill { height: 66%; }
.beat-dot[data-level="1"] .beat-fill { height: 36%; }
.beat-dot[data-level="0"] .beat-fill {
  height: 12%;
  background-color: transparent;
  border: 1px dashed var(--text-secondary);
}

.beat-dot.active .beat-fill {
  background-color: var(--locked-bg);
  opacity: 1;
  box-shadow: 0 0 10px var(--locked-bg);
}

.beat-dot[data-level="3"].active .beat-fill {
  background-color: var(--highlight-bg);
  box-shadow: 0 0 10px var(--highlight-bg);
}

.beat-dot[data-level="0"].active .beat-fill {
  background-color: transparent;
  border-color: var(--accent);
  box-shadow: none;
}

/* 無音小節中は光らせず枠だけで位置を示す */
.beat-dots.silent .beat-dot.active .beat-fill {
  background-color: transparent;
  box-shadow: none;
  opacity: 1;
  outline: 2px solid var(--text-secondary);
}

.beat-dot:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

.beat-meta {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: 0.5rem;
}

.meter-label {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
}

.beat-hint {
  font-size: 0.72rem;
  color: var(--text-secondary);
}

/* ===========================
   BPM 操作・再生
   =========================== */
.bpm-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.bpm-controls input[type="range"] {
  flex: 1;
}

.bpm-input-row {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.bpm-input-row input[type="number"] {
  width: 96px;
  font-size: 1.1rem;
  text-align: center;
}

.play-controls {
  display: flex;
  gap: 0.5rem;
}

.play-controls .btn-start {
  flex: 2;
}

.btn-tap {
  flex: 1;
  font-size: 1.1rem;
  padding: 0.65rem 1rem;
  letter-spacing: 0.1em;
}

.btn-start.playing {
  background-color: var(--btn-danger-bg);
  color: var(--btn-danger-text);
}

.tap-hint {
  font-size: 0.75rem;
  color: var(--text-secondary);
  text-align: center;
  margin-top: 0.5rem;
}

/* キーボードショートカット案内（タッチ端末では非表示） */
.shortcut-hint {
  font-size: 0.72rem;
  color: var(--text-secondary);
  text-align: center;
  line-height: 2;
  margin-top: 0.25rem;
}

@media (hover: none) {
  .shortcut-hint { display: none; }
}

kbd {
  display: inline-block;
  padding: 0 0.35rem;
  border: 1px solid var(--border);
  border-bottom-width: 2px;
  border-radius: 4px;
  background-color: var(--input-bg);
  color: var(--text-primary);
  font-family: inherit;
  font-size: 0.72rem;
  line-height: 1.5;
}

/* ＋／－ボタン（丸形） */
.btn-round {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  padding: 0;
  border-radius: 50%;
  font-size: 1.4rem;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-round-sm {
  width: 34px;
  height: 34px;
  font-size: 1.1rem;
}

/* 長押しで連続変更するボタン: スクロールやダブルタップズームを抑止 */
.btn-hold {
  touch-action: none;
  -webkit-touch-callout: none;
  user-select: none;
  -webkit-user-select: none;
}

/* ===========================
   入力部品（共通）
   =========================== */
.app-main input[type="number"],
.app-main input[type="text"] {
  padding: 0.35rem 0.5rem;
  background-color: var(--input-bg);
  color: var(--text-primary);
  border: 1px solid var(--input-border);
  border-radius: 4px;
  font-size: 0.9rem;
  font-family: inherit;
}

.app-main input[type="text"].invalid {
  border-color: var(--btn-danger-bg);
}

/* レンジスライダー */
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  height: 6px;
  border-radius: 6px;
  background-color: var(--toggle-bg);
  cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background-color: var(--accent);
  border: 2px solid var(--bg-card);
  box-shadow: 0 1px 3px var(--shadow);
}

input[type="range"]::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background-color: var(--accent);
  border: 2px solid var(--bg-card);
}

/* ===========================
   拍子・リズム / サウンド
   =========================== */
.field {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.9rem;
}

.field-stack {
  flex-direction: column;
  align-items: stretch;
  gap: 0.3rem;
}

.field > label,
.field-label {
  font-size: 0.82rem;
  color: var(--text-secondary);
  flex-shrink: 0;
}

.field input[type="range"] {
  flex: 1;
  max-width: 240px;
}

.field-hint {
  font-size: 0.75rem;
  color: var(--btn-danger-bg);
}

.field-hint:empty {
  display: none;
}

#presetSelect {
  min-width: 0;
  flex: 0 1 220px;
}

/* 拍子エディタ: [−] 7 [＋] / [8] */
.meter-editor {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.beats-value {
  min-width: 2ch;
  text-align: center;
  font-size: 1.2rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.meter-slash {
  color: var(--text-secondary);
  font-size: 1.2rem;
}

/* 細分化の選択チップ */
.segmented {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.4rem;
}

.segmented label {
  position: relative;
}

.segmented input {
  position: absolute;
  opacity: 0;
  inset: 0;
  margin: 0;
  cursor: pointer;
}

.segmented span {
  display: block;
  padding: 0.5rem 0.25rem;
  text-align: center;
  font-size: 0.85rem;
  border: 1px solid var(--input-border);
  border-radius: 6px;
  background-color: var(--input-bg);
  color: var(--text-primary);
  transition: background-color 0.2s, color 0.2s;
}

.segmented input:checked + span {
  background-color: var(--btn-primary-bg);
  border-color: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  font-weight: 600;
}

.segmented input:focus-visible + span {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.panel-note {
  font-size: 0.75rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

/* ===========================
   練習モード
   =========================== */
.practice-item + .practice-item {
  border-top: 1px solid var(--border);
  margin-top: 0.75rem;
  padding-top: 0.75rem;
}

.practice-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  font-size: 0.9rem;
  font-weight: 600;
}

.practice-row {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 2.6;
  margin-top: 0.2rem;
}

.practice-row input[type="number"] {
  width: 64px;
  text-align: center;
}

/* ===========================
   ボタン
   =========================== */
.btn {
  padding: 0.45rem 1.1rem;
  border: none;
  border-radius: 6px;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: filter 0.2s, transform 0.1s;
}

.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.btn-primary { background-color: var(--btn-primary-bg); color: var(--btn-primary-text); }
.btn-primary:hover:not(:disabled) { filter: brightness(1.12); }

.btn-secondary { background-color: var(--btn-secondary-bg); color: var(--btn-secondary-text); }
.btn-secondary:hover:not(:disabled) { filter: brightness(1.12); }

.btn-danger { background-color: var(--btn-danger-bg); color: var(--btn-danger-text); }
.btn-danger:hover:not(:disabled) { filter: brightness(1.12); }

.btn-start {
  background-color: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  font-size: 1.1rem;
  padding: 0.65rem 2rem;
}
.btn-start:hover:not(:disabled) { filter: brightness(1.12); }

/* ===========================
   セレクトボックス（共通）
   =========================== */
select {
  padding: 0.35rem 0.4rem;
  background-color: var(--input-bg);
  color: var(--text-primary);
  border: 1px solid var(--input-border);
  border-radius: 4px;
  font-size: 0.85rem;
  cursor: pointer;
}

/* ===========================
   設定パネル
   =========================== */
.settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 0.7rem;
}

.setting-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.3rem;
}

.setting-item label:first-child,
.setting-item .setting-label {
  font-size: 0.82rem;
  color: var(--text-secondary);
}

/* トグルスイッチ */
.toggle-switch {
  position: relative;
  display: inline-block;
  flex-shrink: 0;
  width: 46px;
  height: 24px;
  cursor: pointer;
}

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

.toggle-slider {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background-color: var(--toggle-bg);
  border-radius: 24px;
  transition: background-color 0.3s;
}

.toggle-slider::before {
  content: '';
  position: absolute;
  height: 18px; width: 18px;
  left: 3px; bottom: 3px;
  background-color: var(--text-primary);
  border-radius: 50%;
  transition: transform 0.3s;
}

.toggle-switch input:checked + .toggle-slider { background-color: var(--toggle-active); }
.toggle-switch input:checked + .toggle-slider::before { transform: translateX(22px); }
.toggle-switch input:focus-visible + .toggle-slider { outline: 2px solid var(--accent); outline-offset: 2px; }

/* ===========================
   ナビゲーション
   =========================== */
.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 1rem;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  gap: 0.4rem;
}

.nav-brand {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--accent);
  text-decoration: none;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.82rem;
  transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--accent);
}

/* ===========================
   コンテンツセクション（使い方・FAQ）
   =========================== */
.content-section {
  line-height: 1.8;
}

.content-section h2 {
  margin-top: 0.5rem;
}

.content-section h3 {
  font-size: 0.95rem;
  color: var(--text-primary);
  margin-top: 1rem;
  margin-bottom: 0.4rem;
}

.content-section p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.content-section ul,
.content-section ol {
  padding-left: 1.2rem;
  margin-bottom: 0.5rem;
}

.content-section li {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 0.3rem;
}

/* 使い方ステップ */
.guide-content {
  margin-bottom: 1rem;
}

.guide-step {
  margin-bottom: 0.8rem;
  padding-left: 0.5rem;
  border-left: 3px solid var(--accent);
}

.guide-step h3 {
  margin-top: 0;
  color: var(--accent);
}

/* 使用例リスト */
.use-cases {
  list-style: none;
  padding-left: 0;
}

.use-cases li {
  padding: 0.3rem 0;
  font-size: 0.88rem;
}

.use-cases li::before {
  content: '▸ ';
  color: var(--accent);
}

/* FAQ */
.faq-list {
  margin-top: 0.5rem;
}

.faq-list dt {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-top: 0.8rem;
  padding: 0.3rem 0;
}

.faq-list dt::before {
  content: 'Q. ';
  color: var(--accent);
  font-weight: 700;
}

.faq-list dd {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-left: 0;
  padding: 0.2rem 0 0.5rem 1.2rem;
  border-bottom: 1px solid var(--border);
}

/* ===========================
   法的ページ
   =========================== */
.legal-page {
  padding-top: 1.5rem;
}

.legal-page h1 {
  font-size: 1.4rem;
  color: var(--accent);
  margin-bottom: 0.3rem;
}

.legal-page h2 {
  font-size: 1.05rem;
  margin-top: 1.5rem;
}

.legal-page h3 {
  font-size: 0.95rem;
  margin-top: 1rem;
}

.legal-page a {
  color: var(--accent);
}

.last-updated {
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-bottom: 1rem;
}

/* ===========================
   広告枠（ページ最下部のみ）
   =========================== */
.ad-container {
  max-width: 700px;
  margin: 1rem auto 0;
}

.ad-placeholder {
  background-color: var(--bg-secondary);
  border: 1px dashed var(--border);
  border-radius: 4px;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* レスポンシブ広告枠 */
.ad-responsive {
  min-height: 90px;
  padding: 1rem;
}

/* ===========================
   フッター
   =========================== */
.app-footer {
  text-align: center;
  padding: 1rem;
  color: var(--text-secondary);
  font-size: 0.78rem;
  border-top: 1px solid var(--border);
  margin-top: 0.5rem;
}

.footer-nav ul {
  list-style: none;
  display: flex;
  justify-content: center;
  gap: 1.2rem;
  flex-wrap: wrap;
  margin-bottom: 0.7rem;
}

.footer-nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.8rem;
  transition: color 0.2s;
}

.footer-nav a:hover,
.footer-nav a[aria-current="page"] {
  color: var(--accent);
}

.copyright {
  font-size: 0.72rem;
  color: var(--text-secondary);
  margin-top: 0.3rem;
}

/* ===========================
   レスポンシブ
   =========================== */
@media (max-width: 600px) {
  .app-header h1 { font-size: 1.2rem; }
  .settings-grid { grid-template-columns: repeat(2, 1fr); }

  .site-nav {
    flex-direction: column;
    align-items: flex-start;
  }

  .nav-links { gap: 0.6rem; }

  .btn-start { padding: 0.65rem 1rem; }
}

/* 運営者情報の項目リスト（FAQの「Q.」を付けない版） */
.info-list {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 0.4rem 1.2rem;
  margin: 0.5rem 0 1rem;
  font-size: 0.88rem;
}
.info-list dt { font-weight: 600; color: var(--text-primary); }
.info-list dd { margin: 0; color: var(--text-secondary); }