/*
Theme Name: AI Tools Navigator
Theme URI: https://yourwebsite.com/ai-tools-navigator
Author: Your Name
Author URI: https://yourwebsite.com
Description: A modern WordPress theme for AI tools directory and navigation websites. Features include tool categories, search functionality, responsive design, and clean UI.
Version: 2.1.0
Requires at least: 5.0
Tested up to: 6.4
Requires PHP: 7.4
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: ai-tools-navigator
Tags: one-column, custom-menu, featured-images, theme-options, translation-ready
*/

/* === 全局重置 === */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --primary-color: #6366f1;
  --primary-hover: #4f46e5;
  --secondary-color: #8b5cf6;
  --accent-color: #ec4899;
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --text-light: #9ca3af;
  --bg-primary: #ffffff;
  --bg-secondary: #f9fafb;
  --bg-tertiary: #f3f4f6;
  --border-color: #e5e7eb;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.15);
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --transition: all 0.2s ease;
  --sidebar-width: 200px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  font-size: 14px;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-secondary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

img {
  max-width: 100%;
  height: auto;
}

/* === 主布局 === */
.page-wrapper {
  display: flex;
  min-height: 100vh;
}

/* === 左侧边栏导航 === */
.sidebar-nav {
  width: var(--sidebar-width);
  background: var(--bg-primary);
  border-right: 1px solid var(--border-color);
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  overflow-y: auto;
  z-index: 100;
}

.sidebar-brand {
  padding: 20px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 10px;
}

.sidebar-logo {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 18px;
  font-weight: 700;
}

.sidebar-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
}

.sidebar-menu {
  padding: 12px 0;
  list-style: none;
}

.menu-item {
  position: relative;
}

.menu-item > a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 20px;
  color: var(--text-secondary);
  font-size: 13px;
  transition: var(--transition);
}

.menu-item > a:hover,
.menu-item.current-menu-item > a {
  background: rgba(99, 102, 241, 0.05);
  color: var(--primary-color);
}

.menu-icon {
  width: 18px;
  height: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
}

.menu-arrow {
  margin-left: auto;
  font-size: 12px;
  transition: transform 0.2s;
}

.menu-item:hover .menu-arrow {
  transform: rotate(90deg);
}

.sub-menu {
  display: none;
  list-style: none;
  background: var(--bg-secondary);
  padding: 8px 0;
}

.menu-item:hover > .sub-menu {
  display: block;
}

.sub-menu a {
  display: block;
  padding: 8px 20px 8px 48px;
  color: var(--text-secondary);
  font-size: 13px;
  transition: var(--transition);
}

.sub-menu a:hover {
  color: var(--primary-color);
  background: rgba(99, 102, 241, 0.05);
}

/* === 主内容区 === */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  min-height: 100vh;
}

/* === 顶部导航栏 === */
.top-header {
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  padding: 12px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 50;
}

.header-menu {
  display: flex;
  align-items: center;
  gap: 8px;
}

.hamburger-btn {
  width: 32px;
  height: 32px;
  border: none;
  background: transparent;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
}

.nav-links {
  display: flex;
  gap: 4px;
  list-style: none;
}

.nav-links a {
  padding: 8px 16px;
  color: var(--text-secondary);
  font-size: 14px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.nav-links a:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

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

.action-btn {
  width: 36px;
  height: 36px;
  border: 1px solid var(--border-color);
  background: var(--bg-primary);
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  transition: var(--transition);
}

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

/* === 内容区域 === */
.content-area {
  padding: 24px;
}

/* === 品牌标识区 === */
.brand-section {
  text-align: center;
  padding: 40px 0;
}

.brand-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 12px;
}

.brand-description {
  font-size: 16px;
  color: var(--text-secondary);
}

/* === 搜索区域 === */
.search-section {
  margin-bottom: 24px;
}

.search-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 16px;
}

.search-tab {
  padding: 8px 20px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  font-size: 14px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
}

.search-tab:hover,
.search-tab.active {
  background: var(--primary-color);
  border-color: var(--primary-color);
  color: white;
}

.search-box {
  position: relative;
  max-width: 100%;
}

.search-input {
  width: 100%;
  padding: 16px 20px 16px 48px;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-xl);
  font-size: 16px;
  background: var(--bg-primary);
  transition: var(--transition);
}

.search-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

.search-icon {
  position: absolute;
  left: 18px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 20px;
  color: var(--text-light);
}

.search-engines {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}

.engine-btn {
  padding: 6px 16px;
  background: var(--bg-tertiary);
  border: none;
  border-radius: var(--radius-sm);
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
}

.engine-btn:hover,
.engine-btn.active {
  background: var(--primary-color);
  color: white;
}

/* === 功能卡片区 === */
.feature-cards {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}

.feature-card {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: var(--transition);
  cursor: pointer;
}

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

.feature-card:nth-child(1) { background: linear-gradient(135deg, #e0f2fe 0%, #f0f9ff 100%); }
.feature-card:nth-child(2) { background: linear-gradient(135deg, #fef3c7 0%, #fffbeb 100%); }
.feature-card:nth-child(3) { background: linear-gradient(135deg, #dbeafe 0%, #eff6ff 100%); }
.feature-card:nth-child(4) { background: linear-gradient(135deg, #fce7f3 0%, #fdf2f8 100%); }

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
}

.feature-content h3 {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.feature-content p {
  font-size: 12px;
  color: var(--text-secondary);
}

/* === 广告横幅 === */
.ad-banners {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-bottom: 24px;
}

.ad-banner {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.ad-banner:nth-child(1) { background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%); }
.ad-banner:nth-child(2) { background: linear-gradient(135deg, #10b981 0%, #059669 100%); }

.ad-content {
  flex: 1;
}

.ad-content h3 {
  font-size: 16px;
  font-weight: 600;
  color: white;
  margin-bottom: 4px;
}

.ad-content p {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.9);
}

.ad-btn {
  padding: 8px 20px;
  background: white;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-primary);
  cursor: pointer;
  transition: var(--transition);
}

.ad-btn:hover {
  transform: scale(1.05);
}

/* === 广告区域（三排） === */
.ad-banners-section {
  margin-bottom: 24px;
  width: 100%;
  display: block;
}

/* 第一排和第二排：两列大广告 */
.ad-two-grid {
  display: grid !important;
  grid-template-columns: 1fr 1fr !important;
  gap: 16px;
  margin-bottom: 16px;
  width: 100%;
}

.ad-two-grid::before,
.ad-two-grid::after {
  display: none;
}

.ad-card-large {
  display: block !important;
  border-radius: var(--radius-lg);
  padding: 24px;
  color: white;
  text-decoration: none;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
  min-height: 120px;
  width: 100%;
}

.ad-card-large:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.ad-card-gradient-green {
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
}

.ad-card-gradient-orange {
  background: linear-gradient(135deg, #f97316 0%, #ea580c 100%);
}

.ad-card-gradient-purple {
  background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
}

.ad-card-gradient-blue {
  background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
}

.ad-badge-sm {
  position: absolute;
  top: 12px;
  right: 12px;
  padding: 2px 8px;
  background: rgba(255,255,255,0.2);
  border-radius: 4px;
  font-size: 11px;
  color: white;
}

.ad-card-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.ad-card-brand {
  font-size: 20px;
  font-weight: 700;
}

.ad-card-region {
  font-size: 13px;
  opacity: 0.9;
  padding: 2px 10px;
  background: rgba(255,255,255,0.2);
  border-radius: 12px;
}

.ad-card-body {
  line-height: 1.6;
}

.ad-card-offer {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 6px;
}

.ad-card-features {
  font-size: 13px;
  opacity: 0.85;
}

/* 第三排：四列横幅广告 */
.ad-banner-row {
  display: grid !important;
  grid-template-columns: repeat(4, 1fr) !important;
  gap: 12px;
  width: 100%;
}

.ad-banner-item {
  display: flex;
  flex-direction: column;
  padding: 16px;
  border-radius: var(--radius-md);
  color: white;
  text-decoration: none;
  position: relative;
  transition: var(--transition);
  min-height: 100px;
}

.ad-banner-item:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.ad-badge {
  position: absolute;
  top: 8px;
  right: 8px;
  padding: 2px 6px;
  background: rgba(255,255,255,0.2);
  border-radius: 4px;
  font-size: 10px;
  color: white;
}

.ad-banner-item-brand {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 4px;
}

.ad-banner-item-regions,
.ad-banner-item-desc {
  font-size: 12px;
  opacity: 0.9;
  margin-bottom: 4px;
}

.ad-banner-item-highlight {
  font-size: 12px;
  font-weight: 600;
  margin-bottom: 4px;
}

.ad-banner-item-promo {
  font-size: 11px;
  opacity: 0.85;
}

.ad-promo-code {
  background: rgba(255,255,255,0.25);
  padding: 1px 6px;
  border-radius: 4px;
  font-weight: 600;
}

.ad-banner-item-tag {
  font-size: 11px;
  opacity: 0.8;
  margin-top: auto;
}

.ad-banner-item-coupons {
  display: flex;
  gap: 6px;
  margin-top: auto;
}

.ad-banner-item-coupons span {
  padding: 2px 8px;
  background: rgba(255,255,255,0.2);
  border-radius: 4px;
  font-size: 10px;
}

/* 横幅颜色 */
.ad-banner-dark-blue {
  background: linear-gradient(135deg, #1e40af 0%, #1e3a8a 100%);
}

.ad-banner-light-blue {
  background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
}

.ad-banner-orange {
  background: linear-gradient(135deg, #f97316 0%, #ea580c 100%);
}

.ad-banner-deep-blue {
  background: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
}

/* === 工具列表区 === */
.tools-section {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 24px;
}

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

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

.section-tab {
  padding: 8px 20px;
  background: var(--bg-tertiary);
  border: none;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
}

.section-tab:hover,
.section-tab.active {
  background: var(--primary-color);
  color: white;
}

.view-more {
  font-size: 13px;
  color: var(--primary-color);
  display: flex;
  align-items: center;
  gap: 4px;
}

.view-more:hover {
  gap: 8px;
}

/* === 工具卡片网格 === */
.tools-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.tool-card {
  position: relative;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px;
  transition: var(--transition);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

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

/* 大Logo */
.tool-logo-large {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-secondary));
  box-shadow: var(--shadow-sm);
}

/* 卡片主体（Logo右侧区域） */
.tool-card-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* 卡片头部（名字和评分） */
.tool-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

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

.tool-rating {
  display: flex;
  align-items: center;
  gap: 2px;
  color: #fbbf24;
  font-size: 13px;
  white-space: nowrap;
}

/* 卡片简介 */
.tool-card-desc {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 价格标签 */
.tool-price-tag {
  position: absolute;
  top: 12px;
  right: 12px;
  padding: 3px 10px;
  border-radius: var(--radius-sm);
  font-size: 11px;
  font-weight: 500;
}

.tool-price-tag.price-free {
  background: #d1fae5;
  color: #059669;
}

.tool-price-tag.price-paid {
  background: #fce7f3;
  color: #db2777;
}

/* 旧样式保留兼容 */
.tool-logo {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-secondary));
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
}

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

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

.tool-price {
  display: inline-block;
  padding: 2px 8px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  font-size: 11px;
  color: var(--text-secondary);
  margin-left: 8px;
}

.tool-price.free { background: #d1fae5; color: #059669; }
.tool-price.freemium { background: #dbeafe; color: #2563eb; }
.tool-price.paid { background: #fce7f3; color: #db2777; }

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

/* === 分类标题 === */
.category-header {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 32px 0 20px;
}

.category-icon {
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
}

.category-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
}

/* === 回到顶部 === */
.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 40px;
  height: 40px;
  background: var(--primary-color);
  border: none;
  border-radius: var(--radius-md);
  color: white;
  font-size: 20px;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  box-shadow: var(--shadow-lg);
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
}

/* === 快讯页面样式 === */
.news-layout {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 24px;
}

/* 标题区 */
.news-header {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 20px;
}

.news-title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.news-page-title {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
}

.news-meta {
  display: flex;
  gap: 8px;
}

.meta-tag {
  padding: 4px 12px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  font-size: 12px;
  color: var(--text-secondary);
}

.news-stats {
  display: flex;
  gap: 20px;
  font-size: 13px;
  color: var(--text-secondary);
}

/* 快讯横幅 */
.news-banner {
  background: linear-gradient(135deg, #3b82f6, #2563eb);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 20px;
  color: white;
}

.banner-title {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 8px;
}

.banner-desc {
  font-size: 13px;
  opacity: 0.9;
}

/* 快讯介绍 */
.news-intro {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 24px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-secondary);
}

/* 时间轴 */
.news-timeline {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: 24px;
}

.date-group {
  position: relative;
  padding-left: 24px;
}

.date-group::before {
  content: '';
  position: absolute;
  left: 6px;
  top: 24px;
  bottom: 0;
  width: 2px;
  background: repeating-linear-gradient(
    to bottom,
    var(--border-color) 0,
    var(--border-color) 4px,
    transparent 4px,
    transparent 8px
  );
}

.date-divider {
  padding: 12px 0;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
}

.date-text {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  background: var(--bg-primary);
  padding-right: 12px;
}

.news-item {
  position: relative;
  padding: 16px 0;
  border-bottom: 1px solid var(--border-color);
}

.news-item:last-child {
  border-bottom: none;
}

.news-dot {
  position: absolute;
  left: -24px;
  top: 20px;
  width: 12px;
  height: 12px;
  background: var(--primary-color);
  border-radius: 50%;
  box-shadow: 0 0 0 3px var(--bg-primary);
}

.news-item-title {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 8px;
}

.news-item-title a {
  color: var(--text-primary);
}

.news-item-title a:hover {
  color: var(--primary-color);
}

.news-item-excerpt {
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.news-item-footer {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-light);
}

/* 右侧边栏 */
.news-sidebar {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.sidebar-ad {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ad-placeholder {
  font-size: 14px;
  color: var(--text-light);
}

.sidebar-section {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: 20px;
}

.sidebar-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--primary-color);
}

.sidebar-tools {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sidebar-tool-item {
  padding: 10px 12px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  font-size: 13px;
  color: var(--text-primary);
  transition: var(--transition);
}

.sidebar-tool-item:hover {
  background: var(--primary-color);
  color: white;
}

/* 文章样式 */
.news-article {
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
  padding: 32px;
}

.article-header {
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.article-category {
  padding: 4px 12px;
  background: var(--primary-color);
  color: white;
  border-radius: var(--radius-sm);
  font-size: 12px;
}

.article-date {
  font-size: 13px;
  color: var(--text-secondary);
}

.article-title {
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.4;
  margin-bottom: 16px;
}

.article-stats {
  display: flex;
  gap: 20px;
  font-size: 13px;
  color: var(--text-secondary);
}

.article-thumbnail {
  margin-bottom: 24px;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.article-thumbnail img {
  width: 100%;
  height: auto;
}

.article-content {
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-primary);
}

.article-content p {
  margin-bottom: 20px;
}

.article-content h2 {
  font-size: 22px;
  font-weight: 600;
  margin: 32px 0 16px;
}

.article-content h3 {
  font-size: 18px;
  font-weight: 600;
  margin: 24px 0 12px;
}

.article-content ul,
.article-content ol {
  padding-left: 24px;
  margin-bottom: 20px;
}

.article-content li {
  margin-bottom: 8px;
}

.article-footer {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 16px;
}

.tag {
  padding: 6px 12px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-sm);
  font-size: 13px;
  color: var(--text-secondary);
}

.article-share {
  display: flex;
  justify-content: center;
}

.share-btn {
  padding: 12px 32px;
  background: var(--primary-color);
  color: white;
  border: none;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
}

.share-btn:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
}

/* 文章导航 */
.article-nav {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 24px;
  padding: 20px;
  background: var(--bg-primary);
  border-radius: var(--radius-lg);
}

.nav-prev,
.nav-next {
  flex: 1;
}

.nav-next {
  text-align: right;
}

.nav-prev a,
.nav-next a {
  color: var(--text-secondary);
  font-size: 14px;
  transition: var(--transition);
}

.nav-prev a:hover,
.nav-next a:hover {
  color: var(--primary-color);
}

/* === 响应式设计 === */
@media (max-width: 1400px) {
  .tools-grid {
    grid-template-columns: repeat(5, 1fr);
  }
}

@media (max-width: 1200px) {
  .tools-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .feature-cards {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 1024px) {
  .sidebar-nav {
    transform: translateX(-100%);
    transition: transform 0.3s;
  }
  
  .sidebar-nav.open {
    transform: translateX(0);
  }
  
  .main-content {
    margin-left: 0;
  }
  
  .hamburger-btn {
    display: flex;
  }
  
  .tools-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .news-layout {
    grid-template-columns: 1fr;
  }
  
  .news-sidebar {
    display: none;
  }
}

@media (max-width: 768px) {
  .tools-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .feature-cards {
    grid-template-columns: 1fr;
  }
  
  .ad-banners {
    grid-template-columns: 1fr;
  }
  
  .search-tabs {
    flex-wrap: wrap;
  }
}

@media (max-width: 480px) {
  .tools-grid {
    grid-template-columns: 1fr;
  }
  
  .nav-links {
    display: none;
  }
}