:root {
  --bg-primary: #0b0f19;
  --bg-surface: rgba(17, 24, 39, 0.75);
  --bg-surface-hover: rgba(31, 41, 55, 0.85);
  --bg-sidebar: rgba(15, 23, 42, 0.85);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-focus: rgba(99, 102, 241, 0.5);
  --text-main: #f3f4f6;
  --text-muted: #9ca3af;
  --text-sub: #6b7280;
  --accent: #6366f1;
  --accent-glow: rgba(99, 102, 241, 0.25);
  --badge-bg: rgba(99, 102, 241, 0.15);
  --badge-text: #a5b4fc;
  --tag-bg: rgba(255, 255, 255, 0.05);
  --card-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.35);
}

[data-theme="light"] {
  --bg-primary: #f8fafc;
  --bg-surface: rgba(255, 255, 255, 0.85);
  --bg-surface-hover: #ffffff;
  --bg-sidebar: rgba(248, 250, 252, 0.9);
  --border-color: rgba(0, 0, 0, 0.08);
  --border-focus: rgba(99, 102, 241, 0.4);
  --text-main: #0f172a;
  --text-muted: #475569;
  --text-sub: #94a3b8;
  --accent: #4f46e5;
  --accent-glow: rgba(79, 70, 229, 0.15);
  --badge-bg: rgba(79, 70, 229, 0.1);
  --badge-text: #4f46e5;
  --tag-bg: rgba(0, 0, 0, 0.04);
  --card-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.06);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  overflow-x: hidden;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* 侧边栏 */
.sidebar {
  width: 260px;
  height: 100vh;
  position: fixed;
  left: 0;
  top: 0;
  background: var(--bg-sidebar);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-right: 1px solid var(--border-color);
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  z-index: 50;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 8px 24px 8px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 20px;
}

.brand-logo {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, #6366f1 0%, #ec4899 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 20px;
  box-shadow: 0 4px 12px var(--accent-glow);
}

.brand-title {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.5px;
  background: linear-gradient(90deg, var(--text-main), var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 6px;
  overflow-y: auto;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: 8px;
  color: var(--text-muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s ease;
}

.nav-item:hover, .nav-item.active {
  color: var(--text-main);
  background: var(--bg-surface-hover);
}

.nav-item.active {
  color: var(--accent);
  border-left: 3px solid var(--accent);
}

/* 主内容区 */
.main-content {
  margin-left: 260px;
  flex: 1;
  padding: 32px 48px;
  max-width: 1440px;
  width: calc(100% - 260px);
}

/* 顶部搜索栏 */
.header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 40px;
  position: sticky;
  top: 16px;
  z-index: 40;
  background: var(--bg-surface);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  padding: 12px 20px;
  border-radius: 16px;
  border: 1px solid var(--border-color);
  box-shadow: var(--card-shadow);
}

.search-box {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
  max-width: 580px;
  position: relative;
}

.search-input {
  width: 100%;
  padding: 10px 16px 10px 42px;
  background: var(--tag-bg);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  color: var(--text-main);
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.search-input:focus {
  border-color: var(--border-focus);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

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

.shortcut-badge {
  position: absolute;
  right: 12px;
  font-size: 11px;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--tag-bg);
  border: 1px solid var(--border-color);
  color: var(--text-sub);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

.theme-toggle-btn, .mobile-menu-btn {
  background: var(--tag-bg);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 8px 12px;
  border-radius: 8px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  transition: background-color 0.2s ease;
}

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

.mobile-menu-btn {
  display: none;
}

/* 分类展示 */
.category-section {
  margin-bottom: 48px;
  scroll-margin-top: 100px;
}

.category-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
}

.category-title {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.3px;
}

.category-count {
  font-size: 12px;
  background: var(--tag-bg);
  color: var(--text-sub);
  padding: 2px 8px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
}

/* 工具卡片网格 */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

.tool-card {
  background: var(--bg-surface);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 18px;
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
  transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), box-shadow 0.2s ease, border-color 0.2s ease;
  position: relative;
  overflow: hidden;
}

.tool-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-focus);
  box-shadow: 0 12px 24px -6px rgba(0, 0, 0, 0.2), 0 0 0 1px var(--accent-glow);
}

.card-top {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 12px;
}

.tool-avatar {
  width: 44px;
  height: 44px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 700;
  font-size: 18px;
  flex-shrink: 0;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.15);
}

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

.tool-name-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

.tool-name {
  font-size: 15px;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.tool-badge {
  font-size: 11px;
  padding: 2px 6px;
  border-radius: 4px;
  background: var(--badge-bg);
  color: var(--badge-text);
  font-weight: 500;
  flex-shrink: 0;
}

.tool-desc {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 14px;
  flex: 1;
}

.tool-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-color);
  padding-top: 10px;
  margin-top: auto;
}

.tag-list {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.tag-item {
  font-size: 11px;
  padding: 2px 6px;
  background: var(--tag-bg);
  border-radius: 4px;
  color: var(--text-sub);
}

.link-arrow {
  color: var(--text-sub);
  opacity: 0.6;
  transition: opacity 0.2s, transform 0.2s;
}

.tool-card:hover .link-arrow {
  opacity: 1;
  transform: translateX(3px);
  color: var(--accent);
}

/* 空状态 */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-sub);
  display: none;
}

/* 响应式适配 */
@media (max-width: 900px) {
  .sidebar {
    transform: translateX(-100%);
  }
  .sidebar.open {
    transform: translateX(0);
  }
  .main-content {
    margin-left: 0;
    width: 100%;
    padding: 20px;
  }
  .mobile-menu-btn {
    display: flex;
  }
}