/* ===== 基础变量 ===== */
:root {
  --primary-color: #8B4513;
  --accent-color: #D4AF37;
  --bg-color: #FDF8F0;
  --card-bg: #FFFFFF;
  --text-primary: #2C1810;
  --text-secondary: #6B5B4F;
  --border-color: #E8DDD0;
  --shadow: 0 2px 8px rgba(139, 69, 19, 0.1);
  --shadow-hover: 0 4px 16px rgba(139, 69, 19, 0.15);
  --radius: 8px;
  --max-width: 1200px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background-color: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
}

a {
  text-decoration: none;
  color: var(--primary-color);
  transition: color 0.3s;
}

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

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

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

/* ===== 页头 ===== */
.header {
  background: linear-gradient(135deg, var(--primary-color) 0%, #A0522D 100%);
  color: #fff;
  padding: 16px 0;
  box-shadow: var(--shadow);
}

.header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.logo {
  font-size: 24px;
  font-weight: bold;
  color: #fff;
}

.logo span {
  color: var(--accent-color);
}

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

.nav a {
  color: rgba(255,255,255,0.9);
  font-size: 15px;
}

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

.search-box {
  display: flex;
  gap: 8px;
}

.search-box input {
  padding: 8px 16px;
  border: none;
  border-radius: var(--radius);
  width: 200px;
  background: rgba(255,255,255,0.15);
  color: #fff;
}

.search-box input::placeholder {
  color: rgba(255,255,255,0.6);
}

.search-box button {
  padding: 8px 16px;
  border: none;
  border-radius: var(--radius);
  background: var(--accent-color);
  color: var(--primary-color);
  cursor: pointer;
  font-weight: bold;
}

/* ===== 面包屑 ===== */
.breadcrumb {
  padding: 16px 0;
  font-size: 14px;
  color: var(--text-secondary);
}

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

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

.breadcrumb span {
  margin: 0 8px;
}

/* ===== 特色区域 ===== */
.featured {
  background: linear-gradient(135deg, var(--card-bg) 0%, var(--bg-color) 100%);
  padding: 48px 0;
  margin-bottom: 32px;
  border-bottom: 1px solid var(--border-color);
}

.featured-content {
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.featured-icon {
  font-size: 64px;
  margin-bottom: 16px;
}

.featured h1 {
  font-size: 32px;
  color: var(--primary-color);
  margin-bottom: 16px;
}

.featured p {
  font-size: 18px;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ===== 卡片组件 ===== */
.card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  transition: box-shadow 0.3s;
}

.card:hover {
  box-shadow: var(--shadow-hover);
}

.card-title {
  font-size: 20px;
  color: var(--primary-color);
  margin-bottom: 16px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--accent-color);
}

/* ===== 钱币卡片 ===== */
.coin-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  transition: transform 0.3s, box-shadow 0.3s;
  display: flex;
  gap: 16px;
}

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

.coin-image {
  width: 120px;
  height: 120px;
  background: linear-gradient(135deg, var(--bg-color) 0%, var(--border-color) 100%);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 48px;
  flex-shrink: 0;
}

.coin-info {
  flex: 1;
}

.coin-info h3 {
  font-size: 18px;
  color: var(--primary-color);
  margin-bottom: 8px;
}

.coin-info p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 12px;
}

.coin-meta {
  display: flex;
  gap: 16px;
  font-size: 13px;
  color: var(--text-secondary);
}

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

/* ===== 分类标签 ===== */
.category-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 24px 0;
}

.category-tag {
  padding: 10px 20px;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 24px;
  font-size: 14px;
  color: var(--text-primary);
  transition: all 0.3s;
}

.category-tag:hover {
  background: var(--primary-color);
  color: #fff;
  border-color: var(--primary-color);
}

.category-tag.active {
  background: var(--primary-color);
  color: #fff;
  border-color: var(--primary-color);
}

/* ===== 列表布局 ===== */
.section {
  padding: 32px 0;
}

.section-title {
  font-size: 24px;
  color: var(--primary-color);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 12px;
}

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

.coin-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* ===== 网格布局 ===== */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

/* ===== 侧边栏布局 ===== */
.main-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 32px;
}

.sidebar-section {
  margin-bottom: 24px;
}

.sidebar-section h4 {
  font-size: 16px;
  color: var(--primary-color);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.sidebar-list {
  list-style: none;
}

.sidebar-list li {
  padding: 10px 0;
  border-bottom: 1px dashed var(--border-color);
  font-size: 14px;
}

.sidebar-list li:last-child {
  border-bottom: none;
}

.sidebar-list a {
  color: var(--text-primary);
  display: flex;
  justify-content: space-between;
}

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

.sidebar-list .num {
  color: var(--accent-color);
  font-weight: bold;
}

/* ===== 文章页样式 ===== */
.article-header {
  text-align: center;
  padding: 32px 0;
}

.article-title {
  font-size: 28px;
  color: var(--primary-color);
  margin-bottom: 16px;
}

.article-meta {
  display: flex;
  justify-content: center;
  gap: 24px;
  font-size: 14px;
  color: var(--text-secondary);
}

.article-content {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 40px;
  box-shadow: var(--shadow);
  margin-bottom: 32px;
}

.article-content h2 {
  font-size: 22px;
  color: var(--primary-color);
  margin: 32px 0 16px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.article-content h3 {
  font-size: 18px;
  color: var(--primary-color);
  margin: 24px 0 12px;
}

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

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

.article-content li {
  margin-bottom: 8px;
  line-height: 1.6;
}

.article-content img {
  display: block;
  margin: 24px auto;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.article-content blockquote {
  background: var(--bg-color);
  border-left: 4px solid var(--accent-color);
  padding: 16px 20px;
  margin: 24px 0;
  font-style: italic;
  color: var(--text-secondary);
}

/* ===== 分页 ===== */
.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin: 32px 0;
}

.pagination a,
.pagination span {
  padding: 8px 16px;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  font-size: 14px;
  color: var(--text-primary);
}

.pagination a:hover {
  background: var(--primary-color);
  color: #fff;
  border-color: var(--primary-color);
}

.pagination .current {
  background: var(--primary-color);
  color: #fff;
  border-color: var(--primary-color);
}

/* ===== 相关推荐 ===== */
.related-section {
  margin-top: 32px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.related-card {
  background: var(--card-bg);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow);
  text-align: center;
}

.related-card .icon {
  font-size: 40px;
  margin-bottom: 12px;
}

.related-card h4 {
  font-size: 15px;
  color: var(--primary-color);
  margin-bottom: 8px;
}

.related-card p {
  font-size: 13px;
  color: var(--text-secondary);
}

/* ===== 页脚 ===== */
.footer {
  background: var(--primary-color);
  color: rgba(255,255,255,0.8);
  padding: 40px 0 20px;
  margin-top: 48px;
}

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

.footer-section h4 {
  color: var(--accent-color);
  margin-bottom: 16px;
  font-size: 16px;
}

.footer-section p,
.footer-section a {
  color: rgba(255,255,255,0.7);
  font-size: 14px;
  line-height: 1.8;
}

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

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-bottom: 8px;
}

.footer-bottom {
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,0.1);
  font-size: 13px;
  color: rgba(255,255,255,0.5);
}

/* ===== 404页面 ===== */
.error-page {
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 48px 20px;
}

.error-content {
  max-width: 500px;
}

.error-code {
  font-size: 120px;
  font-weight: bold;
  color: var(--primary-color);
  line-height: 1;
  margin-bottom: 16px;
  opacity: 0.3;
}

.error-icon {
  font-size: 80px;
  margin-bottom: 24px;
}

.error-title {
  font-size: 28px;
  color: var(--primary-color);
  margin-bottom: 16px;
}

.error-desc {
  font-size: 16px;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.btn {
  display: inline-block;
  padding: 12px 32px;
  background: var(--primary-color);
  color: #fff;
  border-radius: var(--radius);
  font-size: 16px;
  transition: background 0.3s;
}

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

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

  .sidebar {
    order: -1;
  }

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

@media (max-width: 768px) {
  .header .container {
    flex-direction: column;
    text-align: center;
  }

  .nav {
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
  }

  .search-box {
    width: 100%;
    justify-content: center;
  }

  .search-box input {
    flex: 1;
    max-width: 200px;
  }

  .featured h1 {
    font-size: 24px;
  }

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

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

  .coin-card {
    flex-direction: column;
  }

  .coin-image {
    width: 100%;
    height: 180px;
  }

  .article-content {
    padding: 24px;
  }

  .article-title {
    font-size: 22px;
  }

  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
}

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

  .category-tags {
    justify-content: center;
  }

  .pagination {
    flex-wrap: wrap;
  }
}