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

:root {
  /* カラーシステム */
  --primary-50: #eff6ff;
  --primary-100: #dbeafe;
  --primary-200: #bfdbfe;
  --primary-300: #93c5fd;
  --primary-400: #60a5fa;
  --primary-500: #3b82f6;
  --primary-600: #2563eb;
  --primary-700: #1d4ed8;
  --accent-400: #4ade80;
  --accent-500: #22c55e;
  --accent-600: #16a34a;

  /* カテゴリカラー */
  --cat-news: #3b82f6;
  --cat-global: #8b5cf6;
  --cat-video: #ef4444;
  --cat-event: #f97316;
  --cat-book: #22c55e;

  /* レベルカラー */
  --level-beginner: #22c55e;
  --level-intermediate: #3b82f6;
  --level-engineer: #8b5cf6;
  --level-business: #f97316;

  /* ライトモード（デフォルト） */
  --bg-primary: #f8fafc;
  --bg-secondary: #f1f5f9;
  --bg-card: #ffffff;
  --bg-header: rgba(248, 250, 252, 0.85);
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-tertiary: #94a3b8;
  --border: #e2e8f0;
  --border-hover: #cbd5e1;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);

  /* 共通 */
  --radius: 12px;
  --radius-sm: 8px;
  --radius-xs: 6px;
  --header-h: 56px;
  --tabbar-h: 60px;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --transition: 0.2s ease;
}

/* ダークモード */
[data-theme="dark"] {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-card: #1e293b;
  --bg-header: rgba(15, 23, 42, 0.9);
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-tertiary: #64748b;
  --border: #334155;
  --border-hover: #475569;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.2);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.25);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.3);
}

html, body {
  height: 100%;
  font-family: "Noto Sans JP", "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 15px;
  line-height: 1.65;
  color: var(--text-primary);
  background: var(--bg-primary);
  -webkit-tap-highlight-color: transparent;
  overscroll-behavior: none;
}

.hidden { display: none !important; }

a { color: var(--primary-500); text-decoration: none; }
a:hover { text-decoration: underline; }

img { max-width: 100%; display: block; }

/* ===== ヘッダー ===== */
#app-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--header-h);
  background: var(--bg-header);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: 1280px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  height: 100%; padding: 0 16px;
}

.logo {
  display: flex; align-items: center; gap: 6px;
  text-decoration: none; color: var(--text-primary);
  font-weight: 700; font-size: 1.2rem;
}

.logo-icon {
  display: inline-flex; align-items: center; justify-content: center;
  width: 32px; height: 32px; border-radius: 8px;
  background: linear-gradient(135deg, var(--primary-500), var(--accent-500));
  color: #fff; font-size: 0.75rem; font-weight: 800; letter-spacing: -0.5px;
}

.desktop-nav {
  display: flex; gap: 4px;
}

.nav-link {
  padding: 6px 14px; border-radius: var(--radius-xs);
  color: var(--text-secondary); font-size: 0.9rem; font-weight: 500;
  text-decoration: none; transition: all var(--transition);
}
.nav-link:hover, .nav-link.active {
  color: var(--primary-500); background: var(--primary-50);
  text-decoration: none;
}
[data-theme="dark"] .nav-link:hover,
[data-theme="dark"] .nav-link.active {
  background: rgba(59,130,246,0.15);
}

.header-actions { display: flex; align-items: center; gap: 4px; }

.icon-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 36px; height: 36px; border-radius: 8px;
  border: none; background: transparent; color: var(--text-secondary);
  cursor: pointer; transition: all var(--transition);
}
.icon-btn:hover { background: var(--bg-secondary); color: var(--text-primary); }

/* ===== 検索オーバーレイ ===== */
#search-overlay {
  position: fixed; top: 0; left: 0; right: 0; bottom: 0;
  z-index: 200; background: var(--bg-primary);
  padding: 16px; overflow-y: auto;
}

.search-box {
  max-width: 640px; margin: 0 auto;
  display: flex; gap: 8px; align-items: center;
  padding: 12px 16px; border-radius: var(--radius);
  background: var(--bg-card); border: 2px solid var(--primary-500);
}

.search-box input {
  flex: 1; border: none; outline: none;
  font-size: 1.1rem; background: transparent;
  color: var(--text-primary);
}
.search-box input::placeholder { color: var(--text-tertiary); }

#search-results {
  max-width: 640px; margin: 16px auto 0;
}

.search-result-item {
  display: flex; gap: 12px; padding: 12px;
  border-radius: var(--radius-sm); cursor: pointer;
  transition: background var(--transition);
}
.search-result-item:hover { background: var(--bg-secondary); }

.search-result-item .result-type {
  font-size: 0.7rem; font-weight: 600; text-transform: uppercase;
  padding: 2px 6px; border-radius: 4px; color: #fff; white-space: nowrap;
  align-self: flex-start;
}

/* ===== モバイルメニュー ===== */
#mobile-menu {
  position: fixed; top: var(--header-h); left: 0; right: 0; bottom: 0;
  z-index: 90; background: var(--bg-primary);
  padding: 16px;
}

.mobile-nav-link {
  display: block; padding: 14px 16px; margin-bottom: 4px;
  border-radius: var(--radius-sm); color: var(--text-primary);
  font-size: 1.05rem; font-weight: 500; text-decoration: none;
  transition: background var(--transition);
}
.mobile-nav-link:hover, .mobile-nav-link.active {
  background: var(--bg-secondary); text-decoration: none;
}

/* ===== メインコンテンツ ===== */
#app-main {
  max-width: 1280px; margin: 0 auto;
  padding: calc(var(--header-h) + 16px) 16px calc(16px + var(--safe-bottom));
  min-height: 100vh;
}

/* ===== Bento Grid ダッシュボード ===== */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.bento-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  overflow: hidden;
}
.bento-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--border-hover);
}

.bento-2x2 { grid-column: span 2; grid-row: span 2; }
.bento-2x1 { grid-column: span 2; }
.bento-1x1 { grid-column: span 1; }
.bento-4x1 { grid-column: span 4; }

.section-title {
  display: flex; align-items: center; gap: 8px;
  font-size: 0.85rem; font-weight: 700; color: var(--text-secondary);
  text-transform: uppercase; letter-spacing: 0.05em;
  margin-bottom: 16px;
}

.section-title .cat-dot {
  width: 8px; height: 8px; border-radius: 50%;
}

.section-title a {
  margin-left: auto; font-size: 0.8rem; font-weight: 500;
  color: var(--primary-500);
}

/* ===== ニュースカード ===== */
.news-card-featured {
  display: flex; flex-direction: column; height: 100%;
}

.news-card-featured .thumb {
  width: 100%; aspect-ratio: 16/9; object-fit: cover;
  border-radius: var(--radius-sm); margin-bottom: 12px;
  background: var(--bg-secondary);
}

.news-card-featured h3 {
  font-size: 1.15rem; font-weight: 700; line-height: 1.5;
  margin-bottom: 8px;
}

.news-card-featured .summary {
  font-size: 0.88rem; color: var(--text-secondary);
  line-height: 1.6; flex: 1;
  display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
}

.news-card-featured .meta {
  display: flex; align-items: center; gap: 8px; margin-top: 12px;
  font-size: 0.78rem; color: var(--text-tertiary);
}

/* 小さなニュースアイテム */
.news-item {
  display: flex; gap: 12px; padding: 10px 0;
  border-bottom: 1px solid var(--border);
}
.news-item:last-child { border-bottom: none; }

.news-item .thumb-sm {
  width: 80px; height: 56px; border-radius: var(--radius-xs);
  object-fit: cover; flex-shrink: 0; background: var(--bg-secondary);
}

.news-item h4 {
  font-size: 0.88rem; font-weight: 600; line-height: 1.45;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}

.news-item .meta {
  font-size: 0.75rem; color: var(--text-tertiary); margin-top: 4px;
}
.news-summary-sm {
  font-size: 0.78rem; color: var(--text-secondary); line-height: 1.45;
  margin: 2px 0 0; display: -webkit-box; -webkit-line-clamp: 1;
  -webkit-box-orient: vertical; overflow: hidden;
}

/* ===== 注目ニュース中型カードグリッド ===== */
.news-medium-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
}

.news-medium-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  cursor: pointer;
  transition: all var(--transition);
}
.news-medium-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.news-medium-visual {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--bg-secondary);
}

.news-medium-visual img.news-medium-thumb {
  width: 100%; height: 100%; object-fit: cover;
}

.news-medium-placeholder {
  width: 100%; height: 100%;
  display: flex; align-items: center; justify-content: center;
  color: rgba(255,255,255,0.9);
  font-size: 0.85rem; font-weight: 700;
  letter-spacing: 0.03em;
}

.news-medium-body {
  padding: 10px 12px;
}
.news-medium-body h4 {
  font-size: 0.85rem; font-weight: 600; line-height: 1.45;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
  margin-bottom: 6px;
}
.news-medium-body .meta {
  display: flex; align-items: center; gap: 6px;
  font-size: 0.72rem; color: var(--text-tertiary);
}

/* ===== レベルバッジ ===== */
.badge {
  display: inline-block; padding: 2px 8px;
  border-radius: 4px; font-size: 0.7rem; font-weight: 600;
  color: #fff; white-space: nowrap;
}
.badge-beginner { background: var(--level-beginner); }
.badge-intermediate { background: var(--level-intermediate); }
.badge-engineer { background: var(--level-engineer); }
.badge-business { background: var(--level-business); }

/* ===== 動画カード ===== */
.video-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}

.video-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
  transition: all var(--transition); cursor: pointer;
}
.video-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }

.video-card .thumb-wrap {
  position: relative; width: 100%; aspect-ratio: 16/9;
  background: var(--bg-secondary);
}
.video-card .thumb-wrap img {
  width: 100%; height: 100%; object-fit: cover;
}
.video-card .duration {
  position: absolute; bottom: 6px; right: 6px;
  background: rgba(0,0,0,0.8); color: #fff;
  font-size: 0.72rem; font-weight: 600;
  padding: 2px 6px; border-radius: 4px;
}

.video-card .info { padding: 12px; }
.video-card .info h4 {
  font-size: 0.88rem; font-weight: 600; line-height: 1.4;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
  margin-bottom: 6px;
}
.video-card .info .channel { font-size: 0.78rem; color: var(--text-secondary); }
.video-card .info .stats {
  display: flex; gap: 12px; margin-top: 6px;
  font-size: 0.75rem; color: var(--text-tertiary);
}

/* ===== イベントリスト ===== */
.event-item {
  display: flex; gap: 16px; padding: 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border); margin-bottom: 8px;
  transition: all var(--transition); cursor: pointer;
}
.event-item:hover { box-shadow: var(--shadow-sm); border-color: var(--border-hover); }

.event-date-box {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  min-width: 56px; padding: 8px;
  background: var(--primary-50); border-radius: var(--radius-xs);
  color: var(--primary-600); font-weight: 700;
}
[data-theme="dark"] .event-date-box { background: rgba(59,130,246,0.12); }
.event-date-box .month { font-size: 0.7rem; text-transform: uppercase; }
.event-date-box .day { font-size: 1.3rem; line-height: 1; }
.event-date-box .time { font-size: 0.7rem; color: var(--text-secondary); margin-top: 2px; }

.event-item .event-info { flex: 1; }
.event-item .event-info h4 { font-size: 0.92rem; font-weight: 600; margin-bottom: 4px; }
.event-desc {
  font-size: 0.78rem; color: var(--text-secondary); line-height: 1.5;
  margin: 4px 0; display: -webkit-box; -webkit-line-clamp: 2;
  -webkit-box-orient: vertical; overflow: hidden;
}
.event-item .event-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 6px; }

.tag {
  display: inline-block; padding: 2px 8px;
  border-radius: 4px; font-size: 0.7rem; font-weight: 500;
  background: var(--bg-secondary); color: var(--text-secondary);
}
.tag-online { background: rgba(59,130,246,0.12); color: var(--primary-500); }
.tag-free { background: rgba(34,197,94,0.12); color: var(--accent-600); }

/* ===== 書籍カード ===== */
.book-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 16px;
}

.book-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
  transition: all var(--transition); cursor: pointer;
}
.book-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }

.book-card .cover-wrap {
  width: 100%; aspect-ratio: 3/4; background: var(--bg-secondary);
  display: flex; align-items: center; justify-content: center;
}
.book-card .cover-wrap img { max-height: 100%; object-fit: contain; }

.book-card .info { padding: 12px; }
.book-card .info h4 {
  font-size: 0.85rem; font-weight: 600; line-height: 1.4;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
  margin-bottom: 4px;
}
.book-card .info .author { font-size: 0.75rem; color: var(--text-secondary); margin-bottom: 6px; }
.book-card .info .rating { font-size: 0.78rem; color: #f59e0b; }
.book-card .info .price { font-size: 0.82rem; font-weight: 600; color: var(--cat-book); }
.book-card .aff-links {
  display: flex; gap: 6px; padding: 0 12px 12px;
}
.btn-aff {
  display: inline-block; padding: 4px 10px; border-radius: var(--radius-xs);
  font-size: 0.72rem; font-weight: 600; text-decoration: none; color: #fff;
}
.btn-amazon { background: #ff9900; }
.btn-rakuten { background: #bf0000; }

/* ===== トレンドワード ===== */
.trend-tags { display: flex; flex-wrap: wrap; gap: 8px; }

.trend-tag {
  display: inline-block; padding: 6px 14px;
  border-radius: 20px; font-size: 0.82rem; font-weight: 500;
  background: var(--bg-secondary); color: var(--text-primary);
  border: 1px solid var(--border); cursor: pointer;
  transition: all var(--transition);
}
.trend-tag:hover {
  background: var(--primary-50); border-color: var(--primary-300);
  color: var(--primary-600); text-decoration: none;
}
[data-theme="dark"] .trend-tag:hover {
  background: rgba(59,130,246,0.15);
}

/* ===== 一覧ページ共通 ===== */
.page-header {
  margin-bottom: 24px;
}
.page-header h2 {
  font-size: 1.5rem; font-weight: 700; margin-bottom: 8px;
}

.filter-bar {
  display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 16px;
}

.filter-chip {
  padding: 6px 14px; border-radius: 20px;
  font-size: 0.82rem; font-weight: 500;
  background: var(--bg-card); color: var(--text-secondary);
  border: 1px solid var(--border); cursor: pointer;
  transition: all var(--transition);
}
.filter-chip:hover, .filter-chip.active {
  background: var(--primary-500); color: #fff; border-color: var(--primary-500);
}

/* ===== 一覧ニュースカード ===== */
.news-list-card {
  display: flex; gap: 16px; padding: 16px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); margin-bottom: 12px;
  transition: all var(--transition); cursor: pointer;
}
.news-list-card:hover { box-shadow: var(--shadow-md); }

.news-list-card .thumb {
  width: 160px; height: 100px; border-radius: var(--radius-sm);
  object-fit: cover; flex-shrink: 0; background: var(--bg-secondary);
}

.news-list-card .content { flex: 1; }
.news-list-card h3 {
  font-size: 1rem; font-weight: 600; line-height: 1.5; margin-bottom: 6px;
}
.news-list-card .summary {
  font-size: 0.85rem; color: var(--text-secondary); line-height: 1.55;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.news-list-card .meta {
  display: flex; align-items: center; gap: 8px; margin-top: 8px;
  font-size: 0.75rem; color: var(--text-tertiary);
}

/* ===== 詳細ページ ===== */
.detail-page {
  max-width: 720px; margin: 0 auto;
}
.detail-page h1 {
  font-size: 1.5rem; font-weight: 700; line-height: 1.6; margin-bottom: 12px;
}
.detail-page .detail-meta {
  display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 20px;
  font-size: 0.82rem; color: var(--text-tertiary);
}
.detail-page .detail-body {
  font-size: 0.95rem; line-height: 1.8; color: var(--text-primary);
}
.detail-page .detail-thumb {
  width: 100%; aspect-ratio: 16/9; object-fit: cover;
  border-radius: var(--radius); margin-bottom: 20px;
  background: var(--bg-secondary);
}
.detail-page .source-link {
  display: inline-block; margin-top: 20px; padding: 10px 20px;
  background: var(--primary-500); color: #fff; border-radius: var(--radius-sm);
  font-weight: 600; font-size: 0.9rem; text-decoration: none;
  transition: background var(--transition);
}
.detail-page .source-link:hover { background: var(--primary-600); text-decoration: none; }

/* ===== 設定ページ ===== */
.settings-section {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px; margin-bottom: 16px;
}
.settings-section h3 { font-size: 1rem; font-weight: 700; margin-bottom: 12px; }

.setting-row {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 0; border-bottom: 1px solid var(--border);
}
.setting-row:last-child { border-bottom: none; }

select, input[type="text"] {
  padding: 6px 12px; border: 1px solid var(--border);
  border-radius: var(--radius-xs); font-size: 0.88rem;
  background: var(--bg-primary); color: var(--text-primary);
}

/* ===== ローディング ===== */
.loading {
  text-align: center; padding: 40px; color: var(--text-tertiary);
}
.loading-spinner {
  display: inline-block; width: 32px; height: 32px;
  border: 3px solid var(--border); border-top-color: var(--primary-500);
  border-radius: 50%; animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== 空状態 ===== */
.empty-state {
  text-align: center; padding: 60px 20px; color: var(--text-tertiary);
}
.empty-state .icon { font-size: 3rem; margin-bottom: 12px; }

/* ===== ページネーション ===== */
.pagination {
  display: flex; justify-content: center; gap: 4px; margin-top: 24px;
}
.page-btn {
  padding: 6px 12px; border: 1px solid var(--border);
  border-radius: var(--radius-xs); font-size: 0.85rem;
  background: var(--bg-card); color: var(--text-secondary);
  cursor: pointer; transition: all var(--transition);
}
.page-btn:hover, .page-btn.active {
  background: var(--primary-500); color: #fff; border-color: var(--primary-500);
}

/* ===== フッター ===== */
#app-footer {
  border-top: 1px solid var(--border);
  padding: 20px 16px; margin-top: 40px;
  color: var(--text-tertiary); font-size: 0.8rem;
}
.footer-inner {
  max-width: 1280px; margin: 0 auto;
  display: flex; justify-content: space-between; align-items: center;
}
.footer-links { display: flex; gap: 16px; }
.footer-links a { color: var(--text-tertiary); }

/* ===== 下部タブバー ===== */
#tab-bar {
  position: fixed; bottom: 0; left: 0; right: 0;
  height: calc(var(--tabbar-h) + var(--safe-bottom));
  padding-bottom: var(--safe-bottom);
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  display: flex; z-index: 90;
}

.tab-item {
  flex: 1; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 2px;
  color: var(--text-tertiary); text-decoration: none;
  font-size: 0.65rem; font-weight: 500;
  transition: color var(--transition);
}
.tab-item svg { width: 20px; height: 20px; }
.tab-item.active, .tab-item:hover { color: var(--primary-500); }

/* ===== レスポンシブ ===== */
.mobile-only { display: none; }

@media (max-width: 768px) {
  .mobile-only { display: flex; }
  .desktop-nav { display: none; }

  #app-main {
    padding-bottom: calc(var(--tabbar-h) + var(--safe-bottom) + 16px);
  }

  #app-footer { padding-bottom: calc(var(--tabbar-h) + var(--safe-bottom) + 20px); }

  .bento-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .bento-2x2 { grid-column: span 2; grid-row: span 1; }
  .bento-2x1 { grid-column: span 2; }
  .bento-4x1 { grid-column: span 2; }

  .news-list-card { flex-direction: column; }
  .news-list-card .thumb { width: 100%; height: 180px; }

  .video-grid { grid-template-columns: repeat(2, 1fr); }
  .book-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 480px) {
  .bento-grid { grid-template-columns: 1fr; }
  .bento-2x2, .bento-2x1, .bento-4x1 { grid-column: span 1; }
  .video-grid { grid-template-columns: 1fr; }
}

/* ===== スクロールバー ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-tertiary); }