/* ============================================================
   Hidden Chimera Tools - 共通スタイルシート (common.css)
   tests サイトと完全統一されたデザインシステム
   ============================================================ */

:root {
  /* --- 基本カラーパレット（tests と完全一致） --- */
  --bg-color: #f8fafc;
  --bg-dot: #cbd5e1;
  --card-bg: #ffffff;
  --card-sub-bg: #f8fafc;
  --text-color: #1e293b;
  --text-strong: #0f172a;
  --text-muted: #64748b;
  --text-subtle: #94a3b8;

  /* --- ブランド・アクセントカラー (Indigo) --- */
  --primary-color: #4f46e5;
  --primary-hover: #4338ca;
  --primary-light: #eef2ff;
  --primary-light-border: #c7d2fe;
  --primary-focus-ring: rgba(99, 102, 241, 0.15);
  --accent-color: #6366f1;

  /* --- 境界線・ライン --- */
  --border-color: #e2e8f0;
  --border-hover: #cbd5e1;

  /* --- 状態カラー --- */
  --success-color: #059669;
  --success-bg: #ecfdf5;
  --success-border: #a7f3d0;
  --danger-color: #dc2626;
  --danger-bg: #fef2f2;
  --danger-border: #fecaca;
  --warning-color: #d97706;
  --warning-bg: #fffbeb;
  --warning-border: #fde68a;

  /* --- UI形状・フォント --- */
  --radius: 12px;
  --radius-lg: 16px;
  --radius-pill: 9999px;
  --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.02), 0 4px 6px -1px rgba(0, 0, 0, 0.04);
  --card-shadow-hover: 0 8px 18px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 8px 18px rgba(15, 23, 42, 0.06);
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  padding: 0;
  background-color: var(--bg-color);
  background-image: radial-gradient(var(--bg-dot) 1.2px, transparent 1.2px);
  background-size: 24px 24px;
  color: var(--text-color);
  font-family: var(--font-family);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  overflow-x: hidden;
}

/* --- ヘッダー領域 --- */
header {
  background-color: #ffffff;
  border-bottom: 1px solid var(--border-color);
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.03);
  position: sticky;
  top: 0;
  z-index: 900;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.logo a {
  color: var(--text-strong);
  text-decoration: none;
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: color 0.15s ease;
}

.logo a:hover {
  color: var(--primary-color);
}

.logo-badge {
  font-size: 0.72rem;
  font-weight: 800;
  color: var(--primary-color);
  background: var(--primary-light);
  border: 1px solid var(--primary-light-border);
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  letter-spacing: 0.04em;
}

/* ヘッダー右リンク（testsなど姉妹サイトへの誘導） */
.btn-nav-sister {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 6px 14px;
  background: var(--primary-light);
  border: 1px solid var(--primary-light-border);
  border-radius: var(--radius-pill);
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--primary-color);
  text-decoration: none;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.btn-nav-sister:hover {
  background: #e0e7ff;
  border-color: #a5b4fc;
  color: var(--primary-hover);
  transform: translateY(-1px);
}

/* --- メインコンテナ --- */
main {
  flex: 1;
  max-width: 920px;
  width: 100%;
  margin: 1.75rem auto;
  padding: 0 1rem 3rem;
  box-sizing: border-box;
}

/* --- パンくずリスト --- */
.breadcrumb {
  font-size: 0.85rem;
  margin-bottom: 1.5rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px;
}

.breadcrumb a {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 600;
  transition: color 0.15s;
}

.breadcrumb a:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

.breadcrumb .sep {
  color: var(--text-subtle);
  font-size: 0.8rem;
}

/* --- フッター領域 --- */
footer {
  text-align: center;
  padding: 2rem 1.5rem 2.5rem;
  border-top: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.82rem;
  background-color: #ffffff;
  margin-top: auto;
}

.footer-sister-links {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 12px;
  font-size: 0.82rem;
}

.footer-sister-links a {
  color: var(--text-muted);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 3px;
  font-weight: 600;
  transition: color 0.15s ease;
}

.footer-sister-links a:hover {
  color: var(--primary-color);
  text-decoration: underline;
}

.footer-sister-sep {
  color: var(--border-hover);
  font-size: 0.75rem;
}

/* ========================================================
   共通UIコンポーネント
   ======================================================== */

/* --- プライマリボタン --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  background-color: var(--primary-color);
  color: #ffffff;
  font-size: 0.95rem;
  font-weight: 700;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
  transition: all 0.2s ease;
  text-decoration: none;
  line-height: 1.4;
}

.btn:hover {
  background-color: var(--primary-hover);
  box-shadow: 0 6px 16px rgba(79, 70, 229, 0.35);
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

.btn:disabled {
  background-color: #e2e8f0;
  color: #94a3b8;
  box-shadow: none;
  cursor: not-allowed;
  transform: none;
}

/* --- セカンダリ / ツールバーボタン --- */
.btn-secondary,
.btn-tool {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 5px;
  background-color: #ffffff;
  border: 1px solid var(--border-color);
  color: var(--text-color);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.45rem 0.9rem;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.15s ease;
  text-decoration: none;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
}

.btn-secondary:hover,
.btn-tool:hover {
  background-color: var(--primary-light);
  border-color: var(--primary-light-border);
  color: var(--primary-color);
  transform: translateY(-1px);
}

.btn-tool.danger:hover,
.btn-icon.danger:hover {
  background-color: var(--danger-bg);
  border-color: var(--danger-border);
  color: var(--danger-color);
}

.btn-primary {
  background-color: var(--primary-color);
  color: #ffffff;
}

.btn-outline {
  background-color: #ffffff;
  border: 1px solid var(--primary-light-border);
  color: var(--primary-color);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
}

.btn-outline:hover {
  background-color: var(--primary-light);
  border-color: var(--primary-color);
  color: var(--primary-hover);
  box-shadow: 0 2px 6px rgba(79, 70, 229, 0.12);
}

.btn-danger {
  background-color: var(--danger-color);
  color: #ffffff;
  box-shadow: 0 4px 12px rgba(220, 38, 38, 0.2);
}

.btn-danger:hover {
  background-color: #b91c1c;
  box-shadow: 0 6px 16px rgba(220, 38, 38, 0.3);
}

.btn-sm {
  font-size: 0.82rem;
  font-weight: 700;
  padding: 0.42rem 0.9rem;
  border-radius: 8px;
  box-shadow: none;
}

.btn-sm:hover {
  box-shadow: 0 2px 6px rgba(15, 23, 42, 0.08);
}

/* --- ピル型バッジ --- */
.intro-badge,
.badge-pill {
  background-color: var(--primary-light);
  color: var(--primary-color);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  display: inline-block;
  border: 1px solid var(--primary-light-border);
  box-shadow: none;
  outline: none;
  -webkit-font-smoothing: antialiased;
}

/* --- ドロップゾーン --- */
.dropzone {
  border: 2px dashed var(--border-hover);
  border-radius: var(--radius-lg);
  padding: 3rem 1.5rem;
  text-align: center;
  background-color: #ffffff;
  cursor: pointer;
  transition: border-color 0.2s, background-color 0.2s, box-shadow 0.2s, transform 0.2s;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.02);
}

.dropzone:hover,
.dropzone.dragover {
  border-color: var(--primary-color);
  background-color: var(--primary-light);
  box-shadow: 0 0 0 4px var(--primary-focus-ring);
  transform: translateY(-1px);
}

.dropzone p {
  color: var(--text-muted);
  margin-top: 0.5rem;
  font-size: 0.92rem;
}

.dropzone-icon {
  font-size: 2.5rem;
  margin-bottom: 0.75rem;
  display: block;
}

/* --- フォーム入力共通 --- */
input[type="text"],
input[type="number"],
input[type="date"],
input[type="time"],
input[type="datetime-local"],
select,
textarea {
  background: #ffffff;
  border: 1px solid var(--border-hover);
  border-radius: 8px;
  color: var(--text-strong);
  padding: 0.6rem 0.85rem;
  font-size: 0.92rem;
  font-family: inherit;
  box-sizing: border-box;
  transition: border-color 0.2s, box-shadow 0.2s;
  outline: none;
}

input:focus,
select:focus,
textarea:focus {
  border-color: #6366f1;
  box-shadow: 0 0 0 3px var(--primary-focus-ring);
}

/* --- 共通カードコンテナ --- */
.card,
.stat-card,
.control-panel,
.editor-section {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--card-shadow);
}

/* --- 通知・注記ボックス --- */
.notice-box,
.info-banner {
  background: var(--card-sub-bg);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 12px 16px;
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.notice-box.primary {
  background: var(--primary-light);
  border-color: var(--primary-light-border);
  color: var(--primary-hover);
}

/* --- プログレスバー共通 --- */
.progress-container,
.progress-bar-container {
  width: 100%;
  height: 10px;
  background-color: var(--border-color);
  border-radius: var(--radius-pill);
  overflow: hidden;
  margin-bottom: 0.5rem;
}

.progress-bar {
  width: 0%;
  height: 100%;
  background: var(--primary-color);
  border-radius: var(--radius-pill);
  transition: width 0.25s ease-out;
}

/* --- 透過チェッカーボード（ライトテーマ統一） --- */
.checkerboard,
.checkerboard-bg {
  background-color: #ffffff !important;
  background-image:
    linear-gradient(45deg, #e2e8f0 25%, transparent 25%),
    linear-gradient(-45deg, #e2e8f0 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #e2e8f0 75%),
    linear-gradient(-45deg, transparent 75%, #e2e8f0 75%) !important;
  background-size: 16px 16px !important;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0 !important;
}

/* --- データテーブル共通 --- */
.file-table,
.results-table,
.comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}

.file-table th,
.results-table th,
.comparison-table th {
  background: #f1f5f9;
  color: var(--text-strong);
  font-weight: 700;
  padding: 0.65rem 0.85rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.file-table td,
.results-table td,
.comparison-table td {
  padding: 0.65rem 0.85rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-color);
}

/* --- 圧縮率などのバッジ --- */
.rate-badge {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-pill);
  font-weight: 700;
  font-size: 0.72rem;
  background: var(--success-bg);
  color: var(--success-color);
  border: 1px solid var(--success-border);
}

.rate-badge.negative {
  background: var(--danger-bg);
  color: var(--danger-color);
  border: 1px solid var(--danger-border);
}

/* --- 仕様説明アコーディオン（tests のスタイル感） --- */
.spec-details {
  margin-top: 3rem;
  padding: 1.25rem 1.5rem;
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.6;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.02);
}

.spec-details summary {
  cursor: pointer;
  user-select: none;
  color: var(--text-strong);
  font-weight: 700;
  outline: none;
}

.spec-details summary:hover {
  color: var(--primary-color);
}

.spec-content {
  margin-top: 1rem;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.25rem;
}

.spec-group h4 {
  font-size: 0.85rem;
  color: var(--text-strong);
  margin-bottom: 0.35rem;
  font-weight: 700;
}

.spec-group ul {
  margin: 0;
  padding-left: 1.2rem;
}

.spec-group li {
  margin-bottom: 0.25rem;
}

/* ========================================================
   トップページ用スタイル（tests の Hero・Grid・Searchを踏襲）
   ======================================================== */
.hero-header {
  text-align: center;
  padding: 24px 16px 20px;
}

.portal-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--primary-color);
  background: var(--primary-light);
  border: 1px solid var(--primary-light-border);
  padding: 4px 12px;
  border-radius: var(--radius-pill);
  margin-bottom: 12px;
}

.portal-tag::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--primary-color);
  border-radius: 50%;
}

.portal-title {
  font-size: 1.85rem;
  font-weight: 900;
  color: var(--text-strong);
  letter-spacing: -0.02em;
  margin-bottom: 10px;
}

.portal-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  max-width: 580px;
  margin: 0 auto;
  line-height: 1.65;
}

/* 特設セーフティバナー */
.portal-safety-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 14px 20px;
  margin: 20px 0 32px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.02);
}

.safety-card-left {
  display: flex;
  align-items: center;
  gap: 12px;
}

.safety-card-icon {
  font-size: 1.4rem;
  line-height: 1;
}

.safety-card-text strong {
  font-size: 0.92rem;
  color: var(--text-strong);
  display: block;
}

.safety-card-text span {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.safety-card-badge {
  font-size: 0.72rem;
  font-weight: 800;
  color: var(--success-color);
  background: var(--success-bg);
  border: 1px solid var(--success-border);
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  white-space: nowrap;
}

/* 検索フィルター */
.search-filter-wrap {
  margin-bottom: 24px;
}

.filter-input {
  width: 100%;
  box-sizing: border-box;
  padding: 12px 18px;
  border-radius: 12px;
  border: 1px solid var(--border-hover);
  background: #ffffff;
  font-size: 0.92rem;
  color: var(--text-strong);
  outline: none;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.filter-input:focus {
  border-color: #6366f1;
  box-shadow: 0 0 0 3px var(--primary-focus-ring);
}

/* カテゴリセクション */
.category-section {
  margin-bottom: 3rem;
}

.section-heading-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding-bottom: 10px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
}

.section-title {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-strong);
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 8px;
}

.section-sub {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
}

/* ツールグリッド & カード */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}

.tool-card {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  text-decoration: none;
  color: inherit;
  box-shadow: var(--card-shadow);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.tool-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-hover);
  box-shadow: var(--card-shadow-hover);
}

.tool-card-top-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 10px;
}

.tool-card-cat {
  font-size: 0.7rem;
  font-weight: 800;
  color: var(--primary-color);
  letter-spacing: 0.04em;
}

.tool-card-icon {
  font-size: 1.5rem;
  line-height: 1;
}

.tool-card-title {
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--text-strong);
  margin-bottom: 6px;
  line-height: 1.4;
}

.tool-card-desc {
  font-size: 0.83rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin-bottom: 14px;
  flex: 1;
}

.tool-card-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.tool-tag {
  background-color: var(--primary-light);
  border: 1px solid var(--primary-light-border);
  font-size: 0.72rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  color: var(--primary-color);
}

.tool-card-link {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--primary-color);
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding-top: 10px;
  border-top: 1px solid #f1f5f9;
}

.tool-card:hover .tool-card-link {
  color: var(--primary-hover);
}

/* ========================================================
   ハンバーガーメニュー・ドロワーサイドバー スタイル
   ======================================================== */
.nav-menu-btn {
  background: none;
  border: 1px solid var(--border-color);
  padding: 0.4rem;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background-color: #ffffff;
  transition: all 0.2s ease;
}

.nav-menu-btn:hover {
  background-color: #f1f5f9;
  border-color: var(--border-hover);
}

.nav-menu-btn span {
  display: block;
  width: 18px;
  height: 2px;
  background-color: var(--text-strong);
  border-radius: 2px;
  margin: 0 auto;
}

/* 背景オーバーレイ */
.drawer-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(15, 23, 42, 0.45);
  backdrop-filter: blur(2px);
  z-index: 998;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.drawer-overlay.active {
  opacity: 1;
  visibility: visible;
}

/* サイドバー本体 */
.nav-drawer {
  position: fixed;
  top: 0;
  left: 0;
  width: 310px;
  max-width: 85vw;
  height: 100vh;
  background-color: #ffffff;
  border-right: 1px solid var(--border-color);
  z-index: 999;
  transform: translateX(-100%);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  display: flex;
  flex-direction: column;
  box-shadow: 10px 0 25px rgba(15, 23, 42, 0.08);
}

.nav-drawer.active {
  transform: translateX(0);
}

.drawer-header {
  padding: 1.1rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-color);
  background-color: #ffffff;
}

.drawer-header-title {
  font-weight: 800;
  font-size: 1rem;
  color: var(--text-strong);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.drawer-close-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.25rem;
  cursor: pointer;
  padding: 0.2rem 0.5rem;
  border-radius: 6px;
  transition: all 0.15s;
}

.drawer-close-btn:hover {
  color: var(--text-strong);
  background: #f1f5f9;
}

.drawer-body {
  flex: 1;
  overflow-y: auto;
  padding: 1rem 0.75rem;
}

.drawer-group {
  margin-bottom: 1.5rem;
}

.drawer-group-title {
  font-size: 0.72rem;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.06em;
  padding: 0 0.75rem 0.4rem;
  font-weight: 800;
}

.drawer-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 0.75rem;
  color: var(--text-color);
  text-decoration: none;
  border-radius: 8px;
  font-size: 0.88rem;
  font-weight: 600;
  transition: background 0.15s, color 0.15s;
}

.drawer-link:hover {
  background: #f8fafc;
  color: var(--primary-color);
}

.drawer-link.current {
  background: var(--primary-light);
  color: var(--primary-color);
  font-weight: 800;
}

.drawer-link-icon {
  font-size: 1.15rem;
  width: 22px;
  text-align: center;
  flex-shrink: 0;
}

.drawer-link-text {
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ========================================================
   レスポンシブ対応
   ======================================================== */
@media (max-width: 640px) {
  header {
    padding: 0.65rem 1rem;
  }
  .logo a {
    font-size: 0.95rem;
  }
  .portal-title {
    font-size: 1.45rem;
  }
  .portal-desc {
    font-size: 0.85rem;
  }
  .portal-safety-card {
    flex-direction: column;
    align-items: flex-start;
  }
  .safety-card-badge {
    align-self: flex-start;
  }
  .tool-grid {
    grid-template-columns: 1fr;
  }
}

/* ========================================================
   SEO解説コンテンツ・FAQ・関連ツール共通スタイル
   ======================================================== */
.seo-article {
  margin-top: 3rem;
  line-height: 1.8;
  color: var(--text-color);
  border-top: 1px solid var(--border-color);
  padding-top: 2rem;
}

.seo-article h2 {
  font-size: 1.45rem;
  font-weight: 800;
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  color: var(--text-strong);
  border-left: 4px solid var(--primary-color);
  padding-left: 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.seo-article h3 {
  font-size: 1.2rem;
  font-weight: 700;
  margin-top: 2rem;
  margin-bottom: 0.75rem;
  color: var(--text-strong);
  border-left: 3px solid var(--accent-color);
  padding-left: 0.75rem;
}

.seo-article p {
  color: var(--text-color);
  margin-bottom: 1.25rem;
  font-size: 0.95rem;
  line-height: 1.8;
}

.seo-article ul,
.seo-article ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
  color: var(--text-color);
  font-size: 0.95rem;
}

.seo-article li {
  margin-bottom: 0.45rem;
  line-height: 1.7;
}

.seo-article strong {
  color: var(--text-strong);
}

.seo-feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
  margin: 1.75rem 0;
}

.seo-feature-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 1.25rem;
  transition: transform 0.2s, box-shadow 0.2s;
}

.seo-feature-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.seo-feature-icon {
  font-size: 1.75rem;
  margin-bottom: 0.5rem;
  display: inline-block;
}

.seo-feature-card h4 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-strong);
}

.seo-feature-card p {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 0;
  line-height: 1.6;
}

/* 比較テーブル用装飾 */
.comparison-table .check-yes {
  color: #16a34a;
  font-weight: 700;
}

.comparison-table .check-no {
  color: #dc2626;
  font-weight: 600;
}

/* FAQブロック */
.faq-block {
  margin-top: 1.5rem;
  margin-bottom: 2rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  transition: border-color 0.2s;
}

.faq-item:hover {
  border-color: #cbd5e1;
}

.faq-q {
  font-weight: 700;
  font-size: 1.02rem;
  color: var(--text-strong);
  margin-bottom: 0.65rem;
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
}

.faq-q-icon {
  color: var(--primary-color);
  font-size: 1.1rem;
  flex-shrink: 0;
}

.faq-a {
  color: var(--text-color);
  font-size: 0.92rem;
  line-height: 1.75;
  margin: 0;
}

/* 関連ツールセクション */
.related-tools-section {
  margin-top: 3.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border-color);
}

.related-tools-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-strong);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.related-tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
}

.related-tool-card {
  display: flex;
  align-items: flex-start;
  gap: 0.85rem;
  padding: 1rem;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--text-color);
  transition: all 0.2s ease;
}

.related-tool-card:hover {
  transform: translateY(-2px);
  border-color: var(--primary-color);
  box-shadow: var(--shadow-md);
}

.related-tool-icon {
  font-size: 1.75rem;
  flex-shrink: 0;
  line-height: 1;
}

.related-tool-info {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.related-tool-name {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text-strong);
}

.related-tool-card:hover .related-tool-name {
  color: var(--primary-color);
}

.related-tool-desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.45;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}


/* ========================================================
   ポータル拡張: サムネイル・ソート・カテゴリチップ・新着枠
   （既存カードのレイアウトに追加要素として後付け。既存クラスの挙動は変更しない）
   ======================================================== */
.tool-card-thumb {
  margin: -20px -20px 14px;
  border-radius: 14px 14px 0 0;
  overflow: hidden;
  aspect-ratio: 600 / 315;
  background: var(--primary-light);
  border-bottom: 1px solid var(--border-color);
}

.tool-card-thumb img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.portal-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-bottom: 20px;
}

.portal-controls .filter-input {
  flex: 1 1 280px;
  width: auto;
}

.sort-select {
  padding: 11px 14px;
  border-radius: 12px;
  border: 1px solid var(--border-hover);
  background: #ffffff;
  font-size: 0.88rem;
  color: var(--text-strong);
  font-family: inherit;
  cursor: pointer;
}

.category-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.category-chip {
  border: 1px solid var(--primary-light-border);
  background: #ffffff;
  color: var(--primary-color);
  font-size: 0.8rem;
  font-weight: 700;
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  font-family: inherit;
}

.category-chip:hover {
  background: var(--primary-light);
}

.category-chip.active {
  background: var(--primary-color);
  border-color: var(--primary-color);
  color: #ffffff;
}

.result-count {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 14px;
}

.featured-section {
  margin-bottom: 2.5rem;
}

.tool-badge-new {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 800;
  color: #ffffff;
  background: #f43f5e;
  padding: 1px 7px;
  border-radius: var(--radius-pill);
  margin-left: 6px;
  vertical-align: middle;
}

/* ========================================================
   ToolKit（assets/js/toolkit.js）共通UI部品
   ======================================================== */
.tk-panel {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin-top: 1.25rem;
}

.tk-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem 1.25rem;
  margin-bottom: 1rem;
}

.tk-field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  min-width: 0;
}

.tk-field.tk-wide {
  grid-column: 1 / -1;
}

.tk-label {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
}

.tk-check label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.88rem;
  color: var(--text-color);
  cursor: pointer;
}

.tk-hint {
  font-size: 0.75rem;
  color: var(--text-subtle);
}

.tk-input {
  width: 100%;
  background: var(--bg-color);
  border: 1px solid var(--border-color);
  color: var(--text-color);
  padding: 0.6rem 0.7rem;
  border-radius: 8px;
  font-family: inherit;
  font-size: 0.92rem;
}

textarea.tk-input {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Yu Gothic", Meiryo, monospace;
  line-height: 1.55;
  resize: vertical;
}

.tk-check .tk-input {
  width: auto;
}

.tk-input:focus {
  outline: none;
  border-color: #6366f1;
  box-shadow: 0 0 0 3px var(--primary-focus-ring);
}

.tk-examples {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.tk-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 1rem;
}

.tk-result {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.tk-result-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.tk-result-title {
  font-weight: 800;
  color: var(--text-strong);
  font-size: 0.95rem;
}

.tk-copy-btn.copied {
  background: var(--success-color);
  border-color: var(--success-color);
  color: #ffffff;
}

.tk-error {
  background: var(--danger-bg);
  border: 1px solid var(--danger-border);
  color: var(--danger-color);
  padding: 0.7rem 1rem;
  border-radius: 8px;
  font-size: 0.88rem;
  font-weight: 600;
}

.tk-note {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.tk-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.tk-stat {
  background: var(--primary-light);
  border: 1px solid var(--primary-light-border);
  border-radius: var(--radius-pill);
  padding: 0.3rem 0.9rem;
  font-size: 0.85rem;
  color: var(--text-strong);
}

.tk-stat strong {
  color: var(--primary-color);
}

.tk-items {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.tk-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  background: var(--card-sub-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.5rem 0.75rem;
}

.tk-item-label {
  flex: 0 0 7rem;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-muted);
}

.tk-item-value {
  flex: 1;
  min-width: 0;
  overflow-wrap: anywhere;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.88rem;
  color: var(--text-strong);
}

.tk-table-wrap {
  overflow-x: auto;
}

.tk-table td,
.tk-table th {
  font-size: 0.85rem;
}

.tk-preview {
  background: var(--card-sub-bg);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
}

.tk-preview-canvas-wrap {
  max-width: 100%;
  overflow: auto;
  display: flex;
  justify-content: center;
  align-items: center;
  background: repeating-conic-gradient(#f1f5f9 0% 25%, #ffffff 0% 50%) 50% / 16px 16px;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 0.75rem;
}

.tk-preview-canvas-wrap svg,
.tk-preview-canvas-wrap canvas,
.tk-preview-canvas-wrap img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: 4px;
}

.tk-preview-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
}

.tk-dropzone {
  width: 100%;
  border: 2px dashed var(--border-hover);
  border-radius: 10px;
  padding: 1.1rem;
  text-align: center;
  background: #f8fafc;
  color: var(--text-muted);
  font-size: 0.88rem;
  cursor: pointer;
  transition: border-color 0.2s, background-color 0.2s;
  margin-bottom: 1rem;
}

.tk-dropzone:hover,
.tk-dropzone.dragover {
  border-color: var(--primary-color);
  background: var(--primary-light);
  color: var(--primary-color);
}

/* --- 開発者クレジット・関連技術ノート直結カード (Tool-led SEO 導線) --- */
.author-note-card {
  margin: 2rem 0;
  padding: 1.25rem 1.5rem;
  background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
  border: 1px solid var(--primary-light-border);
  border-left: 4px solid var(--primary-color);
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.author-note-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.author-note-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-strong);
}

.author-note-badge {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--primary-color);
  background: var(--primary-light);
  border: 1px solid var(--primary-light-border);
  padding: 2px 8px;
  border-radius: var(--radius-pill);
}

.author-note-body {
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--text-color);
}

.author-note-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--primary-color);
  font-weight: 700;
  font-size: 0.88rem;
  text-decoration: none;
  transition: color 0.15s ease;
}

.author-note-link:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

/* --- 計算式・ロジック解説カード --- */
.formula-box {
  margin: 1.25rem 0;
  padding: 1rem 1.25rem;
  background: #f1f5f9;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.9rem;
  color: #0f172a;
  overflow-x: auto;
}

.formula-highlight {
  font-weight: 700;
  color: var(--primary-color);
}

/* --- 具体例・ユースケースグリッド --- */
.usecase-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1rem;
  margin: 1.25rem 0;
}

.usecase-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  box-shadow: var(--card-shadow);
}

.usecase-card h4 {
  font-size: 0.92rem;
  color: var(--text-strong);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.usecase-card p {
  font-size: 0.84rem;
  color: var(--text-muted);
  line-height: 1.5;
  margin: 0;
}

@media (max-width: 640px) {
  .tk-panel {
    padding: 1rem;
  }
  .tk-item {
    flex-wrap: wrap;
  }
  .tk-item-label {
    flex-basis: 100%;
  }
}