:root {
  --bg: #f8f9fc;
  --bg-card: #ffffff;
  --bg-hover: #f0f2f8;
  --text: #1a1d26;
  --text-secondary: #6b7280;
  --text-muted: #9ca3af;
  --border: #e5e7eb;
  --primary: #4f6ef7;
  --primary-hover: #3b5de7;
  --primary-light: rgba(79, 110, 247, 0.08);
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 4px 16px rgba(0, 0, 0, 0.04);
  --shadow-lg: 0 4px 24px rgba(0, 0, 0, 0.08);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.2s ease;
}

[data-theme="dark"] {
  --bg: #0f1117;
  --bg-card: #1a1d27;
  --bg-hover: #252836;
  --text: #e8eaed;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;
  --border: #2d3142;
  --primary: #6b8aff;
  --primary-hover: #8ba3ff;
  --primary-light: rgba(107, 138, 255, 0.12);
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.2), 0 4px 16px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 4px 24px rgba(0, 0, 0, 0.3);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  min-height: 100dvh;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Header */
.header {
  padding: 48px 0 32px;
  text-align: center;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.logo-icon {
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, var(--primary), #8b5cf6);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  color: #fff;
  box-shadow: 0 4px 12px rgba(79, 110, 247, 0.3);
}

.logo h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.tagline {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.badge-mobile { display: none; }

.header-actions {
  position: fixed;
  top: calc(12px + env(safe-area-inset-top));
  right: calc(12px + env(safe-area-inset-right));
  left: calc(12px + env(safe-area-inset-left));
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  z-index: 9999;
  pointer-events: none;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 2px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 3px;
  box-shadow: var(--shadow);
  pointer-events: auto;
  max-width: calc(100% - 52px);
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

.header-nav::-webkit-scrollbar { display: none; }

.header-nav-link {
  padding: 7px 12px;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  border-radius: 6px;
  white-space: nowrap;
  transition: all var(--transition);
  -webkit-tap-highlight-color: transparent;
}

.header-nav-link:hover {
  color: var(--primary);
  background: var(--primary-light);
}

.header-nav-link.active {
  color: #fff;
  background: var(--primary);
  box-shadow: 0 2px 6px rgba(79, 110, 247, 0.25);
}

.logo-link {
  text-decoration: none;
  color: inherit;
}

.logo-link:hover .logo h1 {
  color: var(--primary);
}

.page-breadcrumb {
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-muted);
  margin: -16px 0 24px;
}

.page-breadcrumb a {
  color: var(--primary);
  text-decoration: none;
}

.page-breadcrumb a:hover {
  text-decoration: underline;
}

.subpage-search {
  max-width: 480px;
  margin: 0 auto 28px;
}

.subpage-search .search-input-wrap {
  width: 100%;
}

.icon-btn {
  width: 40px;
  height: 40px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  transition: all var(--transition);
  color: var(--text-secondary);
  pointer-events: auto;
  position: relative;
  z-index: 1;
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

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

/* Search Box */
.search-section {
  margin-bottom: 40px;
}

.search-box {
  display: flex;
  gap: 12px;
  max-width: 680px;
  margin: 0 auto 16px;
}

.search-input-wrap {
  flex: 1;
  position: relative;
}

.search-input {
  width: 100%;
  height: 52px;
  padding: 0 20px 0 48px;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  font-size: 1rem;
  background: var(--bg-card);
  color: var(--text);
  outline: none;
  transition: all var(--transition);
  box-shadow: var(--shadow);
}

.search-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px var(--primary-light);
}

.search-input::placeholder { color: var(--text-muted); }

.search-icon {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 18px;
  pointer-events: none;
}

.search-btn {
  height: 52px;
  padding: 0 28px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  box-shadow: 0 4px 12px rgba(79, 110, 247, 0.3);
}

.search-btn:hover {
  background: var(--primary-hover);
  transform: translateY(-1px);
}

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

.search-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.search-meta label {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}

.search-meta input[type="checkbox"] {
  accent-color: var(--primary);
  width: 16px;
  height: 16px;
}

.active-count {
  background: var(--primary-light);
  color: var(--primary);
  padding: 2px 10px;
  border-radius: 20px;
  font-weight: 600;
}

/* Search History */
.history-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-top: 12px;
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
}

.history-tag {
  padding: 4px 12px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
}

.history-tag:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-light);
}

/* Search Results Tabs */
.search-results {
  margin-bottom: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.result-tabs-wrap {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 8px 0;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  min-width: 0;
}

.result-tabs-scroll {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-card);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 1.1rem;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.result-tabs-scroll:hover {
  color: var(--primary);
  border-color: var(--primary);
  background: var(--primary-light);
}

.result-tabs-scroll[hidden] {
  display: none;
}

.result-tabs-bar {
  flex: 1;
  min-width: 0;
  display: flex;
  gap: 4px;
  overflow-x: auto;
  overflow-y: hidden;
  scroll-behavior: smooth;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 4px;
}

.result-tabs-bar::-webkit-scrollbar {
  height: 4px;
}

.result-tabs-bar::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 2px;
}

.result-tabs-bar::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

.result-tab {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 10px 8px 12px;
  border: 1px solid var(--border);
  border-bottom: none;
  border-radius: 8px 8px 0 0;
  background: var(--bg-card);
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  flex-shrink: 0;
  transition: all var(--transition);
  position: relative;
  top: 1px;
}

.result-tab:hover {
  color: var(--primary);
  background: var(--primary-light);
}

.result-tab.active {
  color: var(--text);
  background: var(--bg-card);
  border-color: var(--primary);
  box-shadow: 0 -2px 0 var(--primary) inset;
  z-index: 1;
}

.result-tab-dot {
  width: 4px;
  height: 16px;
  border-radius: 2px;
  flex-shrink: 0;
}

.result-tab-name {
  max-width: 120px;
  overflow: hidden;
  text-overflow: ellipsis;
}

.result-tab-close {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 4px;
  font-size: 12px;
  color: var(--text-muted);
  transition: all var(--transition);
}

.result-tab-close:hover {
  background: #fee2e2;
  color: #ef4444;
}

.result-close-all {
  flex-shrink: 0;
  padding: 6px 10px;
  font-size: 0.8rem;
}

.result-panels {
  position: relative;
  min-height: 420px;
  background: var(--bg-card);
}

.result-panel {
  display: none;
  flex-direction: column;
  height: min(72vh, 720px);
}

.result-panel.active {
  display: flex;
}

.result-panel-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 12px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
  font-size: 0.78rem;
}

.result-panel-hint {
  color: var(--text-muted);
  flex: 1;
}

.result-external-link {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
  white-space: nowrap;
  flex-shrink: 0;
}

.result-external-link:hover {
  text-decoration: underline;
}

.result-iframe-wrap {
  flex: 1;
  min-height: 0;
  background: #fff;
}

.result-iframe {
  width: 100%;
  height: 100%;
  border: none;
  display: block;
  background: #fff;
}

.result-fallback {
  height: 100%;
  min-height: 280px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 32px 24px;
  background: var(--bg);
}

.result-fallback-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: var(--primary-light);
  color: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 16px;
}

.result-fallback-title {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.result-fallback-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
  max-width: 320px;
  line-height: 1.6;
}

.result-fallback-btn {
  display: inline-flex;
  text-decoration: none;
  height: 44px;
  padding: 0 24px;
  align-items: center;
}

/* Engine Panels */
.engines-section {
  margin-bottom: 48px;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.section-title {
  font-size: 1.1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}

.section-title .badge {
  font-size: 0.75rem;
  font-weight: 500;
  background: var(--primary-light);
  color: var(--primary);
  padding: 2px 8px;
  border-radius: 10px;
}

.section-actions {
  display: flex;
  gap: 8px;
}

.text-btn {
  background: none;
  border: none;
  color: var(--primary);
  font-size: 0.85rem;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}

.text-btn:hover { background: var(--primary-light); }

.engines-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  align-items: stretch;
}

@media (max-width: 768px) {
  .engines-grid { grid-template-columns: 1fr; }
}

.engine-panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.panel-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.panel-label .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.panel-label .dot.active { background: #22c55e; }
.panel-label .dot.available { background: var(--text-muted); }

.engine-list {
  min-height: 120px;
  max-height: min(460px, 60vh);
  display: flex;
  flex-direction: column;
  gap: 6px;
  overflow-y: auto;
  overflow-x: hidden;
  -webkit-overflow-scrolling: touch;
  overscroll-behavior: contain;
  padding-right: 4px;
}

#active-engines:empty::after {
  content: '拖拽或从下方添加搜索引擎';
  display: block;
  text-align: center;
  padding: 32px 16px;
  color: var(--text-muted);
  font-size: 0.85rem;
  border: 2px dashed var(--border);
  border-radius: var(--radius-sm);
}

#available-engines:empty::after {
  content: '暂无可用搜索引擎';
  display: block;
  text-align: center;
  padding: 32px 16px;
  color: var(--text-muted);
  font-size: 0.85rem;
  border: 2px dashed var(--border);
  border-radius: var(--radius-sm);
}

.engine-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: grab;
  transition: all var(--transition);
  user-select: none;
}

.engine-item:hover {
  border-color: var(--primary);
  background: var(--primary-light);
}

.engine-item.sortable-ghost {
  opacity: 0.4;
  background: var(--primary-light);
}

.engine-item.sortable-drag {
  box-shadow: var(--shadow-lg);
  cursor: grabbing;
}

.engine-color {
  width: 4px;
  height: 28px;
  border-radius: 2px;
  flex-shrink: 0;
}

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

.engine-name {
  font-weight: 600;
  font-size: 0.9rem;
}

.engine-country {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.engine-flag {
  font-size: 1.1rem;
  flex-shrink: 0;
}

.engine-remove {
  width: 24px;
  height: 24px;
  border: none;
  background: none;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: 4px;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  flex-shrink: 0;
}

.engine-remove:hover {
  background: #fee2e2;
  color: #ef4444;
}

.engine-add {
  width: 24px;
  height: 24px;
  border: none;
  background: none;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: 4px;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  flex-shrink: 0;
}

.engine-add:hover {
  background: var(--primary-light);
  color: var(--primary);
}

.engine-visit {
  width: 28px;
  height: 28px;
  border: none;
  background: none;
  color: var(--text-muted);
  cursor: pointer;
  border-radius: 4px;
  font-size: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  flex-shrink: 0;
}

.engine-visit:hover {
  background: var(--primary-light);
  color: var(--primary);
}

.filter-bar {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
  flex-wrap: wrap;
}

.filter-btn {
  padding: 4px 12px;
  border: 1px solid var(--border);
  background: var(--bg);
  border-radius: 20px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
}

.filter-btn:hover, .filter-btn.active {
  border-color: var(--primary);
  color: var(--primary);
  background: var(--primary-light);
}

/* AI Section */
.ai-section {
  margin-bottom: 48px;
}

.ai-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
}

.ai-card {
  display: flex;
  flex-direction: column;
  padding: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--text);
  transition: all var(--transition);
  box-shadow: var(--shadow);
  cursor: pointer;
}

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

.ai-card-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.ai-icon {
  font-size: 1.5rem;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
  border-radius: var(--radius-sm);
}

.ai-name {
  font-weight: 600;
  font-size: 0.95rem;
}

.ai-company {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.ai-desc {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.4;
}

.ai-country {
  margin-top: 8px;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.ai-filter {
  margin-bottom: 16px;
}

/* Rankings */
.rank-section {
  margin-bottom: 48px;
}

.rank-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 16px;
  line-height: 1.6;
}

.rank-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.rank-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: border-color var(--transition);
}

.rank-item:hover {
  border-color: var(--primary);
}

.rank-no {
  width: 36px;
  text-align: center;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text-secondary);
  flex-shrink: 0;
}

.rank-main {
  flex: 1;
  min-width: 0;
}

.rank-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.rank-engine {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
}

.rank-color {
  width: 4px;
  height: 20px;
  border-radius: 2px;
  flex-shrink: 0;
}

.rank-name {
  font-weight: 600;
  font-size: 0.95rem;
}

.rank-flag {
  font-size: 1rem;
  flex-shrink: 0;
}

.rank-share {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

.rank-share-val {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--primary);
}

.rank-trend {
  font-size: 0.85rem;
  font-weight: 700;
}

.rank-trend-up { color: #22c55e; }
.rank-trend-down { color: #ef4444; }
.rank-trend-stable { color: var(--text-muted); }

.rank-bar-wrap {
  height: 6px;
  background: var(--bg);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 8px;
}

.rank-bar {
  height: 100%;
  border-radius: 3px;
  transition: width 0.4s ease;
}

.rank-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 12px;
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.rank-actions {
  display: flex;
  flex-direction: column;
  gap: 4px;
  flex-shrink: 0;
}

.rank-visit-btn,
.rank-add-btn {
  width: 32px;
  height: 32px;
  border: 1px solid var(--border);
  background: var(--bg);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 14px;
  color: var(--text-secondary);
  transition: all var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.rank-add-btn:hover {
  border-color: #22c55e;
  color: #22c55e;
  background: rgba(34, 197, 94, 0.08);
}

/* Footer */
.footer {
  text-align: center;
  padding: 32px 0;
  color: var(--text-muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
}

.footer a {
  color: var(--primary);
  text-decoration: none;
}

.footer a:hover { text-decoration: underline; }

.footer-note {
  margin-top: 4px;
}

.footer-contact {
  margin-top: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
}

.footer-contact-label {
  color: var(--text-muted);
  font-size: 0.85rem;
}

.footer-wechat {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border: 1px solid var(--border);
  background: var(--bg-card);
  border-radius: 20px;
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  -webkit-tap-highlight-color: transparent;
  touch-action: manipulation;
}

.footer-wechat::before {
  content: '💬';
  font-size: 0.95rem;
}

.footer-wechat:hover {
  border-color: #07c160;
  color: #07c160;
  background: rgba(7, 193, 96, 0.08);
}

.footer-beian {
  margin-top: 10px;
}

.footer-beian a {
  color: var(--text-muted);
  font-size: 0.8rem;
  text-decoration: none;
}

.footer-beian a:hover {
  color: var(--text-secondary);
  text-decoration: underline;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: var(--text);
  color: var(--bg);
  padding: 10px 24px;
  border-radius: var(--radius);
  font-size: 0.9rem;
  z-index: 1000;
  transition: transform 0.3s ease;
  pointer-events: none;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
}

/* Shortcut hint */
.kbd {
  display: inline-block;
  padding: 1px 6px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 0.75rem;
  font-family: monospace;
}

/* Tab navigation */
.nav-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 4px;
  max-width: 400px;
  margin-left: auto;
  margin-right: auto;
}

.nav-tab {
  flex: 1;
  padding: 10px 16px;
  border: none;
  background: none;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
}

.nav-tab.active {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 2px 8px rgba(79, 110, 247, 0.3);
}

.nav-tab:hover:not(.active) {
  background: var(--bg-hover);
  color: var(--text);
}

.tab-content { display: none; }
.tab-content.active { display: block; }

/* AI Sync Chips */
.ai-sync-panel {
  max-width: 680px;
  margin: 12px auto 0;
  padding: 12px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: all var(--transition);
}

.ai-sync-panel.hidden { display: none; }

.ai-sync-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.ai-sync-count {
  background: var(--primary-light);
  color: var(--primary);
  padding: 1px 8px;
  border-radius: 10px;
  font-size: 0.75rem;
}

.ai-sync-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.ai-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 5px 12px;
  border: 1px solid var(--border);
  background: var(--bg);
  border-radius: 20px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition);
}

.ai-chip:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.ai-chip.active {
  border-color: var(--primary);
  background: var(--primary-light);
  color: var(--primary);
  font-weight: 600;
}

.ai-chip-icon { font-size: 0.9rem; }

/* SEO Content */
.seo-content {
  margin: 48px 0 32px;
  padding: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.seo-content h2 {
  font-size: 1.25rem;
  margin-bottom: 12px;
}

.seo-content h3 {
  font-size: 1rem;
  margin: 20px 0 8px;
  color: var(--text-secondary);
}

.seo-content p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

.seo-content ul {
  padding-left: 20px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.seo-content li { margin-bottom: 6px; line-height: 1.6; }

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

/* ── Mobile Optimization ── */
@media (max-width: 768px) {
  .container {
    padding: 0 16px;
  }

  .header {
    padding: calc(64px + env(safe-area-inset-top)) 0 24px;
  }

  .header-nav-link {
    padding: 8px 10px;
    font-size: 0.78rem;
  }

  .header-actions {
    left: calc(8px + env(safe-area-inset-left));
    right: calc(8px + env(safe-area-inset-right));
  }

  .logo h1 {
    font-size: 1.6rem;
  }

  .logo-icon {
    width: 40px;
    height: 40px;
    font-size: 20px;
  }

  .tagline {
    font-size: 0.88rem;
    padding: 0 8px;
  }

  .search-section {
    margin-bottom: 28px;
  }

  .result-panel {
    height: min(58vh, 560px);
  }

  .result-panel-bar {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }

  .result-tab-name {
    max-width: 72px;
  }

  .result-tabs-scroll {
    width: 32px;
    height: 32px;
  }

  .result-close-all {
    padding: 6px 8px;
    font-size: 0.75rem;
  }

  .search-box {
    flex-direction: column;
    gap: 10px;
    max-width: none;
  }

  .search-input {
    height: 48px;
    font-size: 16px;
    padding: 0 16px 0 44px;
  }

  .search-btn {
    width: 100%;
    height: 48px;
    padding: 0 20px;
    font-size: 1rem;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
  }

  .search-meta {
    gap: 10px 14px;
    justify-content: flex-start;
    font-size: 0.82rem;
  }

  .search-meta label {
    min-height: 36px;
    padding: 4px 0;
  }

  .search-meta input[type="checkbox"] {
    width: 18px;
    height: 18px;
  }

  .kbd-hint {
    display: none;
  }

  .ai-sync-panel {
    max-width: none;
    padding: 12px 14px;
  }

  .ai-chip {
    padding: 8px 14px;
    font-size: 0.82rem;
    min-height: 36px;
  }

  .history-tags {
    max-width: none;
    justify-content: flex-start;
  }

  .history-tag {
    padding: 6px 14px;
    font-size: 0.82rem;
  }

  .nav-tabs {
    max-width: none;
    margin-bottom: 20px;
  }

  .nav-tab {
    padding: 12px 8px;
    font-size: 0.82rem;
    min-height: 44px;
  }

  .section-header {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }

  .section-title {
    flex-wrap: wrap;
    font-size: 1rem;
    gap: 6px;
  }

  .badge-desktop { display: none; }
  .badge-mobile { display: inline; }

  .section-actions {
    width: 100%;
    justify-content: flex-start;
    flex-wrap: wrap;
    gap: 4px 8px;
  }

  .text-btn {
    padding: 8px 12px;
    min-height: 36px;
    font-size: 0.82rem;
  }

  .filter-bar {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    margin: 0 -4px 12px;
    padding: 0 4px 6px;
    mask-image: linear-gradient(to right, transparent, #000 8px, #000 calc(100% - 8px), transparent);
  }

  .filter-bar::-webkit-scrollbar {
    display: none;
  }

  .filter-btn {
    flex-shrink: 0;
    padding: 8px 14px;
    min-height: 36px;
    font-size: 0.82rem;
  }

  .engines-grid {
    gap: 14px;
  }

  .engine-panel {
    padding: 14px;
  }

  .engine-list {
    max-height: min(280px, 38vh);
    min-height: 100px;
  }

  #active-engines:empty::after {
    content: '从下方点击＋添加搜索引擎';
    padding: 24px 12px;
    font-size: 0.8rem;
  }

  .engine-item {
    padding: 12px;
    min-height: 52px;
    gap: 8px;
  }

  .engine-name {
    font-size: 0.88rem;
  }

  .engine-flag {
    display: none;
  }

  .engine-remove,
  .engine-add,
  .engine-visit {
    width: 36px;
    height: 36px;
    font-size: 18px;
  }

  .rank-item {
    padding: 12px 14px;
    gap: 10px;
  }

  .rank-no {
    width: 28px;
    font-size: 1rem;
  }

  .rank-header {
    flex-wrap: wrap;
  }

  .rank-meta span:last-child {
    width: 100%;
  }

  .rank-actions {
    flex-direction: row;
  }

  .rank-visit-btn,
  .rank-add-btn {
    width: 36px;
    height: 36px;
  }

  .ai-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }

  .ai-card {
    padding: 14px 12px;
    min-height: 44px;
  }

  .ai-icon {
    width: 36px;
    height: 36px;
    font-size: 1.3rem;
  }

  .ai-name {
    font-size: 0.88rem;
  }

  .ai-desc {
    font-size: 0.75rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }

  .seo-content {
    margin: 32px 0 24px;
    padding: 20px 16px;
  }

  .seo-content h2 {
    font-size: 1.1rem;
  }

  .footer {
    padding: 24px 0 calc(24px + env(safe-area-inset-bottom));
    font-size: 0.8rem;
  }

  .toast {
    left: 16px;
    right: 16px;
    bottom: calc(16px + env(safe-area-inset-bottom));
    transform: translateY(120px);
    max-width: none;
    text-align: center;
    font-size: 0.85rem;
    line-height: 1.5;
    padding: 12px 16px;
  }

  .toast.show {
    transform: translateY(0);
  }
}

@media (max-width: 380px) {
  .ai-grid {
    grid-template-columns: 1fr;
  }

  .search-meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .logo h1 {
    font-size: 1.45rem;
  }
}

@media (hover: none) and (pointer: coarse) {
  .engine-item {
    cursor: default;
  }

  .engine-item:active {
    border-color: var(--primary);
    background: var(--primary-light);
  }

  .ai-card:hover {
    transform: none;
  }

  .ai-card:active {
    border-color: var(--primary);
    background: var(--primary-light);
  }

  .filter-btn:hover:not(.active) {
    border-color: var(--border);
    color: var(--text-secondary);
    background: var(--bg);
  }
}