/* ===== 基础变量 ===== */
:root {
  --accent-color: #00bcd4;
  --accent-dark: #0097a7;
  --bg-primary: #0a0e1a;
  --bg-secondary: #121829;
  --bg-card: #1a1f35;
  --bg-hover: #252b45;
  --text-primary: #ffffff;
  --text-secondary: #a0aec0;
  --text-muted: #64748b;
  --border-color: #2d3748;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --radius: 8px;
  --radius-lg: 12px;
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
}

/* ===== 重置样式 ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

a {
  color: var(--accent-color);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--accent-dark);
}

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

ul, ol {
  list-style: none;
}

/* ===== 布局容器 ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== 页头 ===== */
.header {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--accent-color), var(--accent-dark));
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
}

.nav {
  display: flex;
  gap: 32px;
}

.nav a {
  color: var(--text-secondary);
  font-weight: 500;
  padding: 8px 0;
  border-bottom: 2px solid transparent;
}

.nav a:hover,
.nav a.active {
  color: var(--accent-color);
  border-bottom-color: var(--accent-color);
}

.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 8px 16px;
  gap: 8px;
}

.search-box input {
  background: transparent;
  border: none;
  color: var(--text-primary);
  outline: none;
  width: 200px;
}

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

/* ===== 面包屑 ===== */
.breadcrumb {
  padding: 16px 0;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.breadcrumb a {
  color: var(--text-secondary);
}

.breadcrumb a:hover {
  color: var(--accent-color);
}

.breadcrumb span {
  margin: 0 8px;
  color: var(--text-muted);
}

/* ===== Hero区域 ===== */
.hero {
  background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-card) 100%);
  padding: 60px 0;
  text-align: center;
}

.hero-title {
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--accent-color), #4dd0e1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.125rem;
  color: var(--text-secondary);
  max-width: 700px;
  margin: 0 auto 32px;
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: 48px;
}

.stat-item {
  text-align: center;
}

.stat-num {
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent-color);
}

.stat-label {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

/* ===== 区块标题 ===== */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}

.section-title {
  font-size: 1.5rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 12px;
}

.section-title::before {
  content: '';
  width: 4px;
  height: 24px;
  background: var(--accent-color);
  border-radius: 2px;
}

.view-all {
  color: var(--accent-color);
  font-size: 0.875rem;
}

/* ===== 卡片组件 ===== */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.card-image {
  width: 100%;
  height: 180px;
  background: var(--bg-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 3rem;
}

.card-body {
  padding: 20px;
}

.card-title {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 8px;
}

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

.card-title a:hover {
  color: var(--accent-color);
}

.card-desc {
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.6;
  margin-bottom: 12px;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  color: var(--text-muted);
  font-size: 0.75rem;
}

.card-meta span {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* ===== 分类标签 ===== */
.tag {
  display: inline-block;
  padding: 4px 12px;
  background: var(--bg-hover);
  border-radius: 20px;
  font-size: 0.75rem;
  color: var(--accent-color);
  margin-right: 8px;
}

.tag-primary {
  background: var(--accent-color);
  color: var(--bg-primary);
}

/* ===== 对比表格 ===== */
.comparison-section {
  padding: 48px 0;
}

.comparison-table-wrap {
  overflow-x: auto;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-color);
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--bg-card);
  min-width: 600px;
}

.comparison-table th,
.comparison-table td {
  padding: 16px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.comparison-table th {
  background: var(--bg-secondary);
  font-weight: 600;
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.comparison-table tr:last-child td {
  border-bottom: none;
}

.comparison-table tr:hover td {
  background: var(--bg-hover);
}

.comparison-table .product-name {
  font-weight: 600;
  color: var(--text-primary);
}

.comparison-table .price {
  color: var(--accent-color);
  font-weight: 600;
}

.comparison-table .rating {
  color: var(--warning);
}

.comparison-table .check {
  color: var(--success);
}

.comparison-table .cross {
  color: var(--danger);
}

.recommend-badge {
  display: inline-block;
  padding: 4px 8px;
  background: var(--success);
  color: white;
  font-size: 0.75rem;
  border-radius: 4px;
  margin-left: 8px;
}

/* ===== 网格布局 ===== */
.grid {
  display: grid;
  gap: 24px;
}

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

.grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

/* ===== 分类网格 ===== */
.category-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin: 32px 0;
}

.category-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  text-align: center;
  transition: all 0.2s;
}

.category-item:hover {
  border-color: var(--accent-color);
  transform: translateY(-4px);
}

.category-icon {
  width: 60px;
  height: 60px;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  font-size: 1.5rem;
}

.category-name {
  font-weight: 600;
  margin-bottom: 4px;
}

.category-count {
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* ===== 文章列表 ===== */
.article-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.article-item {
  display: flex;
  gap: 16px;
  padding: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  transition: all 0.2s;
}

.article-item:hover {
  border-color: var(--accent-color);
}

.article-thumb {
  width: 120px;
  height: 80px;
  background: var(--bg-secondary);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  flex-shrink: 0;
}

.article-info {
  flex: 1;
}

.article-title {
  font-weight: 600;
  margin-bottom: 8px;
}

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

.article-title a:hover {
  color: var(--accent-color);
}

.article-excerpt {
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.5;
  margin-bottom: 8px;
}

/* ===== 侧边栏 ===== */
.sidebar-section {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 24px;
}

.sidebar-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.sidebar-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.sidebar-list li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.sidebar-list li::before {
  content: '•';
  color: var(--accent-color);
}

.sidebar-list a {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.sidebar-list a:hover {
  color: var(--accent-color);
}

/* ===== 内容页布局 ===== */
.content-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 32px;
  padding: 32px 0;
}

.main-content {
  min-width: 0;
}

/* ===== 文章详情 ===== */
.article-header {
  margin-bottom: 32px;
}

.article-header h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 16px;
  line-height: 1.3;
}

.article-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  color: var(--text-muted);
  font-size: 0.875rem;
}

.article-body {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
}

.article-body h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 32px 0 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.article-body h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 24px 0 12px;
  color: var(--accent-color);
}

.article-body p {
  color: var(--text-secondary);
  margin-bottom: 16px;
  line-height: 1.8;
}

.article-body ul,
.article-body ol {
  margin-bottom: 16px;
  padding-left: 24px;
}

.article-body ul li {
  list-style: disc;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.article-body ol li {
  list-style: decimal;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

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

/* ===== 结论框 ===== */
.verdict-box {
  background: linear-gradient(135deg, var(--bg-secondary), var(--bg-hover));
  border: 1px solid var(--accent-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin: 32px 0;
}

.verdict-box h3 {
  color: var(--accent-color);
  margin-bottom: 12px;
}

.verdict-box p {
  margin-bottom: 0;
}

/* ===== 404页面 ===== */
.error-page {
  min-height: 60vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 48px 0;
}

.error-code {
  font-size: 8rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent-color), var(--accent-dark));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
}

.error-title {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 16px;
}

.error-desc {
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  background: var(--accent-color);
  color: var(--bg-primary);
  font-weight: 600;
  border-radius: var(--radius);
  transition: all 0.2s;
}

.btn:hover {
  background: var(--accent-dark);
  color: var(--bg-primary);
}

/* ===== 页脚 ===== */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: 48px 0 24px;
  margin-top: 48px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 32px;
}

.footer-brand {
  max-width: 300px;
}

.footer-brand .logo {
  margin-bottom: 16px;
}

.footer-brand p {
  color: var(--text-secondary);
  font-size: 0.875rem;
  line-height: 1.6;
}

.footer-title {
  font-weight: 600;
  margin-bottom: 16px;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-links a {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.footer-links a:hover {
  color: var(--accent-color);
}

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: 24px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* ===== 响应式设计 ===== */
@media (max-width: 1024px) {
  .content-layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }

  .sidebar-section {
    margin-bottom: 0;
  }
}

@media (max-width: 768px) {
  .header-inner {
    flex-wrap: wrap;
    gap: 16px;
  }

  .nav {
    order: 3;
    width: 100%;
    justify-content: center;
    gap: 16px;
  }

  .search-box {
    order: 2;
  }

  .hero-title {
    font-size: 1.75rem;
  }

  .hero-stats {
    gap: 24px;
  }

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

  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .sidebar {
    grid-template-columns: 1fr;
  }

  .article-item {
    flex-direction: column;
  }

  .article-thumb {
    width: 100%;
    height: 160px;
  }
}

@media (max-width: 480px) {
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .category-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .hero-stats {
    flex-direction: column;
    gap: 16px;
  }

  .comparison-table th,
  .comparison-table td {
    padding: 12px;
  }
}