:root {
  --bg-app: #f4f6f9;
  --bg-surface: #ffffff;
  --bg-subtle: #f8fafc;
  --bg-hover: #f1f5f9;
  --bg-selected: #eff6ff;
  --border-color: #e2e8f0;
  --border-strong: #cbd5e1;

  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #64748b;

  --primary: #1d4ed8;
  --primary-hover: #1e40af;
  --primary-light: #dbeafe;

  --accent-amber: #d97706;
  --accent-amber-bg: #fef3c7;
  --success: #15803d;
  --danger: #b91c1c;

  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08);
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --font-sans: "BIZ UDPGothic", "Hiragino Kaku Gothic ProN", "Yu Gothic UI", "Meiryo", system-ui, sans-serif;
  --font-mono: "BIZ UDGothic", "Consolas", "SFMono-Regular", monospace;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html, body {
  height: 100%;
  font-family: var(--font-sans);
  background-color: var(--bg-app);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* アプリ全体ヘッダ */
.app-header {
  height: 54px;
  background: linear-gradient(90deg, #0f172a 0%, #1e3a8a 100%);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  box-shadow: var(--shadow-sm);
  z-index: 20;
}

.brand-group {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  width: 30px;
  height: 30px;
  border-radius: 7px;
  background: rgba(255, 255, 255, 0.16);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 16px;
}

.brand-title {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand-badge {
  font-size: 11px;
  background: rgba(59, 130, 246, 0.35);
  border: 1px solid rgba(147, 197, 253, 0.4);
  padding: 2px 8px;
  border-radius: 999px;
  color: #e0f2fe;
}

.header-meta {
  font-size: 12px;
  color: #cbd5e1;
}

/* 2ペインワークスペース */
.workspace-grid {
  display: grid;
  grid-template-columns: 380px 1fr;
  height: calc(100vh - 54px);
  overflow: hidden;
}

/* 左ペイン：検索・一覧 */
.left-pane {
  background: var(--bg-surface);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
}

.left-pane-tabs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-subtle);
}

.left-tab-btn {
  padding: 11px 12px;
  border: none;
  background: transparent;
  font-family: inherit;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-secondary);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  transition: all 0.15s ease;
}

.left-tab-btn:hover {
  color: var(--primary);
  background: var(--bg-hover);
}

.left-tab-btn.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
  background: var(--bg-surface);
}

.count-pill {
  font-size: 11px;
  background: var(--border-color);
  color: var(--text-primary);
  padding: 1px 7px;
  border-radius: 999px;
}

.search-controls {
  padding: 14px 14px 10px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.search-input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.search-icon {
  position: absolute;
  left: 11px;
  color: var(--text-muted);
  font-size: 14px;
  pointer-events: none;
}

.search-input {
  width: 100%;
  padding: 9px 32px 9px 34px;
  font-family: inherit;
  font-size: 14px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.search-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(29, 78, 216, 0.14);
}

.clear-input-btn {
  position: absolute;
  right: 8px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 16px;
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 4px;
}

.clear-input-btn:hover {
  background: var(--bg-hover);
  color: var(--text-primary);
}

.filter-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.filter-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-secondary);
  white-space: nowrap;
}

.filter-select {
  flex: 1;
  padding: 6px 8px;
  font-family: inherit;
  font-size: 12px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  color: var(--text-primary);
}

.preset-chips-row {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.preset-chip {
  font-family: inherit;
  font-size: 11px;
  padding: 3px 8px;
  border-radius: 999px;
  border: 1px solid var(--border-color);
  background: var(--bg-subtle);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s;
}

.preset-chip:hover {
  background: var(--primary-light);
  border-color: #93c5fd;
  color: var(--primary);
}

.search-status-bar {
  padding: 7px 14px;
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border-color);
  font-size: 11.5px;
  color: var(--text-muted);
}

.law-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.law-card {
  padding: 11px 12px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-surface);
  cursor: pointer;
  transition: all 0.14s ease;
}

.law-card:hover {
  border-color: #93c5fd;
  background: var(--bg-hover);
}

.law-card.selected {
  border-color: var(--primary);
  background: var(--bg-selected);
  box-shadow: inset 3px 0 0 var(--primary);
}

.law-card-header {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 5px;
}

.law-type-badge {
  font-size: 10.5px;
  font-weight: 700;
  padding: 1px 7px;
  border-radius: 4px;
  background: #e2e8f0;
  color: #334155;
}

.law-type-badge.type-Constitution {
  background: #fef3c7;
  color: #92400e;
}
.law-type-badge.type-Act {
  background: #dbeafe;
  color: #1e40af;
}
.law-type-badge.type-CabinetOrder {
  background: #dcfce7;
  color: #166534;
}
.law-type-badge.type-MinisterialOrdinance {
  background: #f3e8ff;
  color: #6b21a8;
}
.law-type-badge.type-Rule {
  background: #ffedd5;
  color: #9a3412;
}

.law-category-tag {
  font-size: 10.5px;
  color: var(--text-muted);
  background: var(--bg-subtle);
  padding: 1px 6px;
  border-radius: 4px;
  border: 1px solid var(--border-color);
}

.law-card-title {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 3px;
  line-height: 1.4;
}

.law-card-num {
  font-size: 11.5px;
  color: var(--text-muted);
}

.list-empty-message,
.list-error-message,
.list-loading {
  padding: 32px 18px;
  text-align: center;
  color: var(--text-muted);
  font-size: 13px;
}

.list-empty-message .sub {
  margin-top: 8px;
  font-size: 12px;
}

.list-error-message {
  color: var(--danger);
}

.list-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid var(--border-color);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.75s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* 右ペイン：変換設定・プレビュー・ダウンロード */
.right-pane {
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
  position: relative;
  background: var(--bg-app);
}

/* 変換オプション設定バー（常時上部に配置） */
.options-toolbar {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  padding: 10px 20px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  box-shadow: var(--shadow-sm);
  z-index: 10;
}

.options-toolbar-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 5px;
}

.option-chip-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12.5px;
  font-weight: 700;
  padding: 5px 11px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  background: var(--bg-subtle);
  color: var(--text-primary);
  cursor: pointer;
  user-select: none;
  transition: all 0.15s;
}

.option-chip-toggle:hover {
  border-color: var(--primary);
  background: var(--bg-selected);
}

.option-chip-toggle input[type="checkbox"] {
  accent-color: var(--primary);
  width: 15px;
  height: 15px;
  cursor: pointer;
}

.option-chip-toggle.highlight-feature {
  border-color: #93c5fd;
  background: #eff6ff;
  color: #1e3a8a;
}

.option-select-group {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--text-secondary);
}

.option-select {
  padding: 4px 8px;
  font-family: inherit;
  font-size: 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  background: var(--bg-surface);
}

/* 空状態ビュー */
.empty-state-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px;
  text-align: center;
  color: var(--text-secondary);
}

.empty-state-icon {
  font-size: 42px;
  margin-bottom: 12px;
}

.empty-state-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 8px;
}

/* 詳細ビュー */
.law-detail-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  position: relative;
}

.loading-overlay {
  position: absolute;
  inset: 0;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(2px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  z-index: 30;
  font-weight: 700;
  color: var(--primary);
}

.error-banner {
  margin: 12px 20px;
  padding: 12px 16px;
  background: #fef2f2;
  border: 1px solid #fecaca;
  color: var(--danger);
  border-radius: var(--radius-md);
  font-size: 13px;
}

.law-header-card {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  padding: 14px 20px;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.law-header-info {
  flex: 1;
  min-width: 0;
}

.selected-law-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.35;
  margin-bottom: 4px;
}

.selected-law-num {
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.meta-badges-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}

.meta-badge {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 4px;
  background: var(--bg-subtle);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
}

.meta-badge.mono {
  font-family: var(--font-mono);
}

.law-header-actions {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
  flex-shrink: 0;
}

.action-buttons-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn {
  font-family: inherit;
  font-size: 13px;
  font-weight: 700;
  padding: 8px 14px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-strong);
  background: var(--bg-surface);
  color: var(--text-primary);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.15s ease;
}

.btn:hover {
  background: var(--bg-hover);
}

.btn-primary {
  background: var(--primary);
  border-color: var(--primary);
  color: #ffffff;
  box-shadow: 0 2px 6px rgba(29, 78, 216, 0.25);
}

.btn-primary:hover {
  background: var(--primary-hover);
  border-color: var(--primary-hover);
}

.btn-favorite.is-favorite {
  background: var(--accent-amber-bg);
  border-color: #fcd34d;
  color: var(--accent-amber);
}

.stats-text {
  font-size: 11.5px;
  color: var(--text-muted);
}

/* ビュー切替タブバー */
.view-tabs-bar {
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border-color);
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.view-tabs-group {
  display: flex;
  gap: 4px;
}

.view-tab-btn {
  padding: 9px 14px;
  font-family: inherit;
  font-size: 12.5px;
  font-weight: 700;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  border-bottom: 2px solid transparent;
  cursor: pointer;
}

.view-tab-btn:hover {
  color: var(--primary);
}

.view-tab-btn.active {
  color: var(--primary);
  border-bottom-color: var(--primary);
  background: var(--bg-surface);
}

.outline-toggle-btn {
  font-family: inherit;
  font-size: 12px;
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  background: var(--bg-surface);
  color: var(--text-secondary);
  cursor: pointer;
}

.outline-toggle-btn.active {
  background: var(--primary-light);
  border-color: #93c5fd;
  color: var(--primary);
  font-weight: 700;
}

/* プレビュー＆目次分割領域 */
.preview-split-wrapper {
  flex: 1;
  display: flex;
  overflow: hidden;
}

.outline-sidebar {
  width: 280px;
  background: var(--bg-surface);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: width 0.2s ease;
}

.outline-sidebar.collapsed {
  width: 0;
  border-right: none;
}

.outline-header {
  padding: 9px 12px;
  font-size: 12px;
  font-weight: 700;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-color);
  background: var(--bg-subtle);
}

.outline-list {
  flex: 1;
  overflow-y: auto;
  padding: 8px 6px;
}

/* 階層ツリー化された目次グループ */
.outline-tree-group {
  margin-bottom: 2px;
}

.outline-group-row {
  display: flex;
  align-items: center;
  gap: 2px;
}

.outline-collapse-btn {
  width: 20px;
  height: 22px;
  flex-shrink: 0;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 11px;
  cursor: pointer;
  border-radius: 4px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.outline-collapse-btn:hover {
  background: var(--bg-hover);
  color: var(--primary);
}

.outline-group-children {
  margin-left: 10px;
  padding-left: 8px;
  border-left: 1.5px solid #cbd5e1;
}

.outline-tree-group.collapsed > .outline-group-children {
  display: none;
}

.outline-item {
  display: block;
  width: 100%;
  text-align: left;
  font-family: inherit;
  font-size: 12px;
  padding: 4px 7px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  border-radius: 4px;
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.outline-item:hover {
  background: var(--bg-hover);
  color: var(--primary);
}

.outline-item.is-section {
  font-weight: 700;
  color: var(--text-primary);
}

.outline-item.is-section.level-2 {
  color: #1e3a8a;
  font-size: 12.5px;
}

.outline-item.is-article {
  padding-left: 14px;
  font-size: 11.5px;
  color: var(--text-secondary);
}

.markdown-preview-scroll {
  flex: 1;
  overflow-y: auto;
  padding: 24px 32px 60px;
  background: var(--bg-surface);
}

/* Markdownプレビューの階層グループ＆タイポグラフィ */
.md-frontmatter {
  background: #0f172a;
  color: #e2e8f0;
  border-radius: var(--radius-md);
  padding: 12px 16px;
  margin-bottom: 24px;
  font-family: var(--font-mono);
  font-size: 12px;
  overflow-x: auto;
}

.md-frontmatter-badge {
  font-size: 10.5px;
  font-weight: 700;
  color: #93c5fd;
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.md-h1 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  border-bottom: 2px solid var(--primary);
  padding-bottom: 8px;
  margin: 0 0 12px;
}

/* 編・章・節・款・目の入れ子グループ構造 */
.md-section-group {
  margin: 18px 0 14px;
}

.md-section-group > .md-group-body {
  padding-left: 14px;
  border-left: 2px solid #e2e8f0;
  margin-top: 8px;
}

.md-section-group.md-level-2 > .md-group-body {
  padding-left: 12px;
  border-left: 2px solid #cbd5e1;
}

/* セクション見出し（編・章・節・款・目）の階層別デザイン */
.md-section-heading {
  font-weight: 700;
  line-height: 1.4;
}

.md-section-heading.md-h-level-2 {
  font-size: 18px;
  color: #1e3a8a;
  background: #eff6ff;
  border-left: 4px solid var(--primary);
  padding: 8px 14px;
  border-radius: 0 6px 6px 0;
}

.md-section-heading.md-h-level-3 {
  font-size: 16px;
  color: #0f172a;
  background: #f8fafc;
  border-left: 4px solid #3b82f6;
  border-bottom: 1px solid var(--border-color);
  padding: 6px 12px;
}

.md-section-heading.md-h-level-4 {
  font-size: 15px;
  color: #1e293b;
  border-bottom: 2px solid #cbd5e1;
  padding: 4px 6px;
}

.md-section-heading.md-h-level-5 {
  font-size: 14.2px;
  color: #334155;
  background: #f1f5f9;
  border-left: 3px solid #64748b;
  padding: 4px 10px;
  border-radius: 0 4px 4px 0;
}

.md-section-heading.md-h-level-6 {
  font-size: 13.5px;
  color: #475569;
  border-bottom: 1px dashed #94a3b8;
  padding: 3px 6px;
}

/* 条（Article）のグループ＆見出しデザイン（編・章・節・款・目の内部に明確に包含されるスタイル） */
.md-article-group {
  margin: 12px 0 14px;
  padding: 10px 14px 6px;
  background: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-md);
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.02);
}

.md-article-heading {
  font-size: 14.2px;
  font-weight: 700;
  color: #0f172a;
  margin: 0 0 8px;
  padding-bottom: 5px;
  border-bottom: 1px solid #f1f5f9;
}

.md-paragraph {
  font-size: 14px;
  line-height: 1.8;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.md-list {
  list-style: none;
  margin: 6px 0 12px;
  padding-left: 0;
}

.md-list-item {
  font-size: 13.8px;
  line-height: 1.75;
  margin-bottom: 5px;
  padding-left: 16px;
  position: relative;
}

.md-list-item.depth-1 { padding-left: 36px; }
.md-list-item.depth-2 { padding-left: 56px; }
.md-list-item.depth-3 { padding-left: 76px; }
.md-list-item.depth-4 { padding-left: 96px; }

.md-quote {
  border-left: 3px solid #94a3b8;
  background: var(--bg-subtle);
  padding: 8px 14px;
  margin: 8px 0;
  color: var(--text-secondary);
  font-size: 13.5px;
}

.md-table-wrapper {
  overflow-x: auto;
  margin: 12px 0;
}

.md-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

.md-table th,
.md-table td {
  border: 1px solid var(--border-strong);
  padding: 7px 10px;
  text-align: left;
  vertical-align: top;
}

.md-table th {
  background: var(--bg-subtle);
  font-weight: 700;
}

/* ソース表示領域 */
.source-view-wrapper {
  flex: 1;
  display: flex;
  overflow: hidden;
  padding: 16px 20px;
  background: var(--bg-app);
}

.markdown-source-textarea {
  width: 100%;
  height: 100%;
  resize: none;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.65;
  padding: 16px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  background: #0f172a;
  color: #f8fafc;
  outline: none;
}

/* RAG条文チャンクプレビュー領域 */
.chunks-view-wrapper {
  flex: 1;
  overflow-y: auto;
  padding: 18px 24px 48px;
}

.chunks-header-info {
  padding: 10px 14px;
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  border-radius: var(--radius-md);
  color: #1e3a8a;
  font-size: 13px;
  margin-bottom: 14px;
}

.chunks-grid {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.chunk-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.chunk-card-head {
  padding: 8px 12px;
  background: var(--bg-subtle);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
}

.chunk-index {
  font-family: var(--font-mono);
  font-size: 11px;
  background: #dbeafe;
  color: #1e40af;
  padding: 1px 6px;
  border-radius: 4px;
}

.chunk-breadcrumb {
  font-size: 11px;
  color: var(--text-muted);
  background: #ffffff;
  border: 1px solid var(--border-color);
  padding: 1px 7px;
  border-radius: 999px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 480px;
}

.chunk-len {
  margin-left: auto;
  font-size: 11px;
  color: var(--text-muted);
}

.chunk-pre {
  padding: 10px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--text-primary);
}

/* トースト通知 */
.toast-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  z-index: 100;
}

.toast {
  padding: 10px 16px;
  border-radius: var(--radius-md);
  background: #0f172a;
  color: #ffffff;
  font-size: 13px;
  font-weight: 700;
  box-shadow: var(--shadow-md);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.toast-success {
  background: var(--success);
}

.toast-error {
  background: var(--danger);
}

.toast.fade-out {
  opacity: 0;
  transform: translateY(6px);
}

[hidden] {
  display: none !important;
}

@media (max-width: 960px) {
  .workspace-grid {
    grid-template-columns: 300px 1fr;
  }
  .outline-sidebar {
    display: none;
  }
}