/* ==========================================================
   国際音声字母 (IPA) キーボード - スイス・スタイル (Swiss Typographic Style)
   Design Principles:
   - Strict Grid System & Rational Typography
   - Zero Corner Radii (border-radius: 0)
   - Zero Artificial Shadows (box-shadow: none)
   - Full OpenType Ligature Support (Tone Letter Ligatures)
   - Professional SIL Phonetic Typography (Charis SIL)
   ========================================================== */

:root {
  --bg-page: #ffffff;
  --bg-surface: #ffffff;
  --bg-subtle: #f4f4f5;
  --bg-header: #18181b;
  --text-header: #ffffff;
  --bg-empty: #fcfcfc;

  --border-strong: #000000;
  --border-mid: #27272a;
  --border-light: #d4d4d8;
  --border-subtle: #e4e4e7;

  --text-main: #09090b;
  --text-muted: #52525b;
  --text-dim: #71717a;

  --accent-red: #e11d48;

  --font-main: "Noto Sans", "Noto Sans JP", -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --font-ui: var(--font-main);
  --font-ipa: var(--font-main);
}

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

html {
  background-color: var(--bg-page);
  color: var(--text-main);
  font-family: var(--font-ui);
  font-size: 13px;
  line-height: 1.4;
  -webkit-font-smoothing: antialiased;
}

body {
  width: 100%;
  min-height: 100vh;
  overflow-y: auto;
  overflow-x: auto;
  background-color: var(--bg-page);
  padding: 0 16px 40px;
}

.app-container {
  max-width: 1600px;
  margin: 0 auto;
}

/* ==========================================================
   スティッキー固定ヘッダー & 入力パネル
   ========================================================== */
.sticky-header-container {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--bg-page);
  border-bottom: 2px solid var(--border-strong);
  padding: 10px 0 8px;
  margin-bottom: 16px;
}

.header-meta {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 8px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border-light);
}

.title-wrap {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.app-title {
  font-size: 16px;
  font-weight: 800;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  color: var(--text-main);
}

.app-subtitle {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  text-transform: uppercase;
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* 入力欄 & 操作ボタングループ */
.input-row {
  display: flex;
  gap: 10px;
  align-items: stretch;
}

.textarea-container {
  flex: 1;
  position: relative;
}

#ipa-input {
  width: 100%;
  height: 56px;
  padding: 8px 12px;
  font-family: var(--font-ipa);
  font-size: 24px;
  line-height: 1.25;
  color: var(--text-main);
  background: #ffffff;
  border: 1px solid var(--border-strong);
  border-radius: 0;
  resize: none;
  outline: none;
  /* OpenType合字の有効化（Chao Tone Letter Ligatures） */
  font-feature-settings: "liga" 1, "dlig" 1;
  font-variant-ligatures: normal contextual common-ligatures;
}

#ipa-input:focus {
  border-width: 2px;
  padding: 7px 11px;
}

.char-counter {
  position: absolute;
  right: 8px;
  bottom: 6px;
  font-family: var(--font-ui);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  background: rgba(255, 255, 255, 0.92);
  padding: 1px 4px;
  border: 1px solid var(--border-light);
  border-radius: 0;
  pointer-events: none;
}

/* 操作ボタングループ */
.action-grid {
  display: grid;
  grid-template-columns: repeat(4, auto);
  gap: 4px;
  align-content: stretch;
}

.swiss-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 12px;
  height: 26px;
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--text-main);
  background: #ffffff;
  border: 1px solid var(--border-strong);
  border-radius: 0;
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
  transition: background-color 0.1s, color 0.1s;
}

.swiss-btn:hover {
  background: var(--text-main);
  color: #ffffff;
}

.swiss-btn:active {
  background: #27272a;
  color: #ffffff;
}

.swiss-btn.btn-black {
  background: var(--text-main);
  color: #ffffff;
  border-color: var(--text-main);
}

.swiss-btn.btn-black:hover {
  background: #27272a;
}

.swiss-btn.btn-help {
  font-weight: 800;
  padding: 0 10px;
  background: #ffffff;
  color: var(--text-main);
}

/* スイス・スタイル言語スイッチャー (JA / EN セグメントコントロール) */
.lang-switch {
  display: inline-flex;
  align-items: center;
  height: 26px;
  background: #ffffff;
  border: 1px solid var(--border-strong);
  border-radius: 0;
  overflow: hidden;
  user-select: none;
}

.lang-btn {
  background: #ffffff;
  border: none;
  color: var(--text-muted);
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 0 10px;
  height: 100%;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background-color 0.1s, color 0.1s;
}

.lang-btn:first-child {
  border-right: 1px solid var(--border-strong);
}

.lang-btn:hover:not(.active) {
  color: var(--text-main);
  background: var(--bg-subtle);
}

.lang-btn.active {
  background: var(--text-main);
  color: #ffffff;
  cursor: default;
}

/* ホバーステータス情報バー */
.status-ticker {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 11px;
  padding: 5px 8px;
  margin-top: 8px;
  background: var(--bg-subtle);
  border-left: 3px solid var(--border-strong);
  min-height: 24px;
}

.status-symbol {
  font-family: var(--font-ipa);
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
  min-width: 32px;
  font-feature-settings: "liga" 1;
}

.status-name {
  font-weight: 700;
  color: var(--text-main);
}

.status-desc {
  font-weight: 400;
  color: var(--text-muted);
}

/* モバイル用タブ（デフォルト非表示） */
.mobile-tabs {
  display: none;
  gap: 4px;
  margin-top: 8px;
  overflow-x: auto;
  border-top: 1px solid var(--border-light);
  padding-top: 6px;
}

.mobile-tab-btn {
  padding: 6px 10px;
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  background: #ffffff;
  border: 1px solid var(--border-strong);
  border-radius: 0;
  cursor: pointer;
  white-space: nowrap;
}

.mobile-tab-btn.active {
  background: var(--text-main);
  color: #ffffff;
}

/* ==========================================================
   盤面メインレイアウト（合理的スイス・グリッド 3段構造）
   Tier 1: 肺臓気流子音 (全幅 100%)
   Tier 2: 非肺臓気流・二重調音 (左 56%) ＋ 母音台形 (右 44%)
   Tier 3: 補助記号 (左 50%) ＋ 声調・超分節 (右 50%)
   ========================================================== */
.ipa-layout {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Tier 1: 肺臓気流子音 (Full Width) */
.layout-tier-1 {
  width: 100%;
}

/* Tier 2: 非肺臓気流 ＋ 母音 */
.layout-tier-2 {
  display: flex;
  gap: 16px;
  align-items: stretch;
}

.col-tier2-left {
  flex: 1.25;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.col-tier2-right {
  flex: 1;
  min-width: 380px;
  display: flex;
  flex-direction: column;
}

/* Tier 3: 補助記号 ＋ 声調・超分節 */
.layout-tier-3 {
  display: flex;
  gap: 16px;
  align-items: stretch;
}

.col-tier3-left {
  flex: 1;
  min-width: 0;
}

.col-tier3-right {
  flex: 1;
  min-width: 0;
}

/* ==========================================================
   セクション構造 & テーブルデザイン
   ========================================================== */
.swiss-section {
  border: 1px solid var(--border-strong);
  background: #ffffff;
  border-radius: 0;
  overflow: hidden;
}

.swiss-section-header {
  background: var(--bg-header);
  color: var(--text-header);
  padding: 4px 8px;
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.swiss-section-header .sub {
  font-size: 9.5px;
  font-weight: 500;
  color: #a1a1aa;
}

.table-responsive {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

/* テーブルスタイル（行列・マトリクス形式） */
.swiss-table {
  width: 100%;
  border-collapse: collapse;
  text-align: center;
  font-size: 11px;
}

.swiss-table th,
.swiss-table td {
  border: 1px solid var(--border-light);
  padding: 0;
  height: 25px;
  vertical-align: middle;
}

/* すべての列見出し (thead th, tbody th) のデザイン統一 */
.swiss-table th {
  background: #f4f4f5;
  color: var(--text-main);
  font-family: var(--font-ui);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.02em;
  padding: 3px 3px;
  border-color: var(--border-light);
}

/* 列見出し行 (header-row) の下部境界線を 2px solid #000000 で統一 */
.swiss-table thead tr:last-child th,
.swiss-table tr.header-row th,
.swiss-table tr.header-row td {
  border-bottom: 2px solid var(--border-strong) !important;
  font-size: 9.5px;
}

.swiss-table tr.header-row th:not(.origin-cell) {
  color: var(--text-muted);
}

/* 表頭の左上原点交差セル (origin-cell) */
.swiss-table th.origin-cell,
.swiss-table td.origin-cell {
  background: #ebebee;
  color: var(--text-main) !important;
  font-size: 9.5px !important;
  font-weight: 700;
  text-align: center;
  border-right: 2px solid var(--border-strong) !important;
  border-bottom: 2px solid var(--border-strong) !important;
  white-space: nowrap;
}

/* 大見出し・カテゴリー区分（統一ブラック帯） */
.swiss-table .category-header {
  background: #18181b !important;
  color: #ffffff !important;
  font-family: var(--font-ui);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-align: left;
  padding: 4px 8px;
  border: 1px solid #18181b !important;
  border-bottom: 2px solid #000000 !important;
}

/* 行見出し (row-header) */
.swiss-table .row-header {
  background: #f4f4f5;
  color: var(--text-main);
  font-family: var(--font-ui);
  font-size: 10px;
  font-weight: 700;
  text-align: left;
  padding: 0 8px;
  white-space: nowrap;
  border-right: 2px solid var(--border-strong);
  border-left: 1px solid var(--border-light);
}

.swiss-table .cell-empty {
  background-color: var(--bg-empty);
}

/* ==========================================================
   リスト形式テーブル (swiss-table-list: 補助記号・超分節要素)
   2列1組（区分＋記号）のキー・バリュー形式
   ペア間を 2px 黒線で明確に区切り、ペア内部は 1px 軽境界線
   ========================================================== */
.swiss-table-list {
  width: 100%;
  table-layout: fixed;
  border-collapse: collapse;
  text-align: center;
  font-size: 11px;
}

.swiss-table-list th,
.swiss-table-list td {
  border: 1px solid var(--border-light);
  padding: 0;
  height: 25px;
  vertical-align: middle;
}

.swiss-table-list th {
  background: #f4f4f5;
  color: var(--text-muted);
  font-family: var(--font-ui);
  font-size: 9.5px;
  font-weight: 700;
  letter-spacing: 0.02em;
  padding: 3px 2px;
  border-color: var(--border-light);
}

.swiss-table-list thead tr:last-child th,
.swiss-table-list tr.header-row th {
  border-bottom: 2px solid var(--border-strong) !important;
}

/* 項目ラベル (item-label / row-header): ペアの左側セル */
.swiss-table-list .item-label,
.swiss-table-list .row-header {
  background: #f4f4f5;
  color: var(--text-main);
  font-family: var(--font-ui);
  font-size: 10px;
  font-weight: 700;
  text-align: left;
  padding: 0 6px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  border-right: 1px solid var(--border-light) !important;
  border-left: 1px solid var(--border-light);
}

/* ペアの区切り境界線: 各ペアの右端（列2、列4）に 2px solid #000000 */
.swiss-table-list th:nth-child(2),
.swiss-table-list th:nth-child(4),
.swiss-table-list td:nth-child(2),
.swiss-table-list td:nth-child(4),
.swiss-table-list .pair-end {
  border-right: 2px solid var(--border-strong) !important;
}

/* 大見出し・カテゴリー区分（統一ブラック帯） */
.swiss-table-list .category-header {
  background: #18181b !important;
  color: #ffffff !important;
  font-family: var(--font-ui);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-align: left;
  padding: 4px 8px;
  border: 1px solid #18181b !important;
  border-bottom: 2px solid #000000 !important;
}

.swiss-table-list .cell-empty {
  background-color: var(--bg-empty);
}

/* 複数記号セル（上寄り・下寄り・R音性・区切り等） */
.swiss-table td.cell-multi-btn,
.swiss-table-list td.cell-multi-btn {
  padding: 0 !important;
}

.cell-multi-btn {
  display: flex !important;
  flex-direction: row !important;
  align-items: stretch !important;
  justify-content: stretch !important;
  width: 100% !important;
  height: 100% !important;
}

.cell-multi-btn button.ipa-btn {
  flex: 1 1 0 !important;
  width: auto !important;
  min-width: 0 !important;
  height: 100% !important;
  padding: 0 1px !important;
  font-size: 13.5px !important;
}

.cell-multi-btn button.ipa-btn:not(:last-child) {
  border-right: 1px solid var(--border-light) !important;
}

/* 補助記号・超分節要素セクションのスクロールバー抑制（デスクトップ専用: 769px以上） */
@media (min-width: 769px) {
  #sec-diacritics,
  #sec-diacritics .table-responsive,
  #sec-suprasegmentals,
  #sec-suprasegmentals .table-responsive {
    overflow-x: hidden !important;
  }
}

/* ==========================================================
   IPA記号ボタン（Noto Sans 公式フォント ＆ 合字対応）
   ========================================================== */
button.ipa-btn {
  width: 100%;
  height: 100%;
  min-height: 24px;
  border: none;
  background: transparent;
  color: var(--text-main);
  font-family: var(--font-ipa);
  font-size: 14.5px;
  font-weight: 400;
  line-height: 1;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 1px 2px;
  outline: none;
  user-select: none;
  border-radius: 0;
  white-space: nowrap;
  transition: background-color 0.08s, color 0.08s;
  /* OpenType合字設定（Chao Tone Letter Ligatures & Combining Diacritics） */
  font-feature-settings: "liga" 1, "calt" 1, "ccmp" 1;
  font-variant-ligatures: normal contextual common-ligatures;
}

button.ipa-btn:hover {
  background-color: var(--text-main);
  color: #ffffff;
}

button.ipa-btn:active {
  background-color: #3f3f46;
  color: #ffffff;
}

/* 無声/有声の境界点線 */
td.td-voiceless {
  border-right: 1px dashed var(--border-light) !important;
}

td.td-voiced {
  border-left: none !important;
}

/* 補助記号ボタン */
button.ipa-btn.mark-btn {
  font-size: 15px;
}

/* トーンバー合字ボタン (垂直スレンダープロポーション) */
button.ipa-btn.tone-btn {
  width: 100%;
  height: 100%;
  min-height: 28px;
  padding: 3px 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.tone-icon {
  width: 12px;
  height: 20px;
  flex-shrink: 0;
  display: block;
  stroke: currentColor;
  fill: none;
}

/* ==========================================================
   母音台形 (Vowel Trapezoid) - 完全枠内収容設計
   ========================================================== */
.vowel-board {
  padding: 10px;
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  box-sizing: border-box;
}

.vowel-diagram-wrap {
  display: flex;
  gap: 6px;
  align-items: center;
  width: 100%;
  justify-content: center;
}

.vowel-y-axis {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: 176px;
  width: 68px;
  font-family: var(--font-ui);
  font-size: 9.5px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--text-muted);
  text-align: right;
  padding: 2px 4px 2px 0;
  white-space: nowrap;
  flex-shrink: 0;
}

.vowel-stage {
  position: relative;
  width: 270px;
  height: 176px;
  background: #ffffff;
  border: 1px solid var(--border-light);
  flex-shrink: 0;
}

.vowel-stage svg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.vowel-pair {
  position: absolute;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: translate(-50%, -50%);
  z-index: 2;
  white-space: nowrap;
}

.vowel-pair .v-dot {
  font-size: 8px;
  color: var(--border-strong);
  margin: 0 1px;
  line-height: 1;
}

.vowel-pair .ipa-btn {
  width: 20px;
  height: 20px;
  font-size: 14px;
}

.vowel-x-axis {
  display: flex;
  justify-content: space-between;
  width: 270px;
  margin-top: 6px;
  margin-left: 68px;
  font-family: var(--font-ui);
  font-size: 9.5px;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--text-muted);
  padding: 0 4px;
}

/* ==========================================================
   日本語母音 (Japanese Vowels) セクション & 母音台形
   ========================================================== */
.japanese-vowels-block {
  border-top: 2px solid var(--border-strong);
  background: #ffffff;
}

.japanese-vowels-header {
  background: var(--bg-header);
  color: var(--text-header);
  padding: 4px 8px;
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.06em;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.japanese-vowels-header .sub {
  font-size: 9.5px;
  font-weight: 500;
  color: #a1a1aa;
}

.jp-vowel-board {
  border-top: 1px solid var(--border-light);
  background: #ffffff;
}

/* ==========================================================
   スマートツールチップ（スイス・タイポグラフィ仕様）
   ========================================================== */
#smart-tooltip {
  position: fixed;
  display: none;
  align-items: center;
  gap: 12px;
  background: #000000;
  color: #ffffff;
  border: 1px solid #27272a;
  border-radius: 0;
  padding: 8px 12px;
  pointer-events: none;
  z-index: 10000;
  max-width: 320px;
}

.tt-symbol {
  font-family: var(--font-ipa);
  font-size: 30px;
  font-weight: 400;
  line-height: 1;
  color: #ffffff;
  border-right: 1px solid #3f3f46;
  padding-right: 10px;
  min-width: 38px;
  text-align: center;
  font-feature-settings: "liga" 1;
}

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

.tt-name {
  font-family: var(--font-ui);
  font-size: 12px;
  font-weight: 700;
  color: #ffffff;
}

.tt-en {
  font-family: var(--font-ui);
  font-size: 10.5px;
  color: #a1a1aa;
}

.tt-cat {
  font-family: var(--font-ui);
  font-size: 9.5px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: #d4d4d8;
}

/* トースト通知 */
#toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: #000000;
  color: #ffffff;
  border: 1px solid #3f3f46;
  padding: 8px 20px;
  border-radius: 0;
  font-family: var(--font-ui);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.02em;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s ease, transform 0.15s ease;
  z-index: 10001;
}

#toast.visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ==========================================================
   「？」コマンド 操作説明モーダル
   ========================================================== */
.modal-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10002;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.15s ease;
}

.modal-backdrop.active {
  opacity: 1;
  pointer-events: auto;
}

.modal-box {
  background: #ffffff;
  border: 2px solid var(--border-strong);
  border-radius: 0;
  width: 92%;
  max-width: 620px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px;
  border-bottom: 2px solid var(--border-strong);
  background: var(--bg-header);
  color: #ffffff;
}

.modal-title {
  font-family: var(--font-ui);
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.modal-close {
  background: none;
  border: none;
  font-size: 20px;
  color: #ffffff;
  cursor: pointer;
  padding: 0 4px;
  line-height: 1;
}

.modal-close:hover {
  color: var(--accent-red);
}

.modal-body {
  padding: 20px 24px;
  overflow-y: auto;
  font-family: var(--font-ui);
  font-size: 13px;
  line-height: 1.65;
  color: var(--text-main);
}

.modal-body h3 {
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-main);
  margin: 16px 0 8px;
  border-bottom: 1px solid var(--border-light);
  padding-bottom: 4px;
}

.modal-body h3:first-child {
  margin-top: 0;
}

.modal-body p {
  margin-bottom: 10px;
}

.modal-body ul {
  margin-left: 20px;
  margin-bottom: 14px;
}

.modal-body li {
  margin-bottom: 4px;
}

.modal-body kbd {
  display: inline-block;
  padding: 2px 6px;
  font-family: monospace;
  font-size: 11px;
  font-weight: 700;
  background: #f4f4f5;
  border: 1px solid var(--border-strong);
  border-radius: 0;
}

.modal-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-main) !important;
  text-decoration: none;
  font-family: var(--font-ui);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 5px 12px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-mid);
  border-radius: 0;
  transition: background-color 0.1s ease, color 0.1s ease, border-color 0.1s ease;
}

.modal-link:hover {
  background: var(--text-main);
  color: #ffffff !important;
  border-color: var(--border-strong);
}

.modal-link:hover .modal-link-icon {
  fill: #ffffff;
}

.modal-link-icon {
  width: 12px;
  height: 12px;
  fill: currentColor;
  flex-shrink: 0;
  display: inline-block;
  vertical-align: -1px;
}

/* ==========================================================
   レスポンシブデザイン（モバイル・タブレット）
   ========================================================== */
@media (max-width: 1200px) {
  .layout-tier-2,
  .layout-tier-3 {
    flex-direction: column;
  }

  .col-tier2-right {
    min-width: 0;
  }
}

@media (max-width: 768px) {
  body {
    padding: 0 8px 30px;
  }

  .header-meta {
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
  }

  .title-wrap {
    flex-direction: column;
    gap: 2px;
    align-items: flex-start;
  }

  .app-title {
    font-size: 14px;
  }

  .app-subtitle {
    font-size: 10px;
  }

  .header-controls {
    align-self: flex-end;
  }

  .mobile-tabs {
    display: flex;
  }

  .action-grid {
    grid-template-columns: repeat(2, auto);
  }

  .swiss-section {
    display: none;
  }

  .swiss-section.tab-active {
    display: block;
  }

  /* モバイル環境では全テーブル（補助記号・超分節要素含む）の横スクロールを許可 */
  #sec-diacritics,
  #sec-diacritics .table-responsive,
  #sec-suprasegmentals,
  #sec-suprasegmentals .table-responsive {
    overflow-x: auto !important;
    -webkit-overflow-scrolling: touch;
  }

  .table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .swiss-table,
  .swiss-table-list {
    min-width: 600px;
  }

  .swiss-table td, .swiss-table th,
  .swiss-table-list td, .swiss-table-list th {
    height: 32px;
  }

  button.ipa-btn {
    min-height: 30px;
    font-size: 16px;
  }
}