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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.8;
  color: #333;
  background-color: #fff;
}

a {
  color: #333;
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: #666;
}

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

ul {
  list-style: none;
}

/* ===== 布局容器 ===== */
.container {
  max-width: 680px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* ===== 页头 ===== */
.header {
  padding: 2rem 0;
  border-bottom: 1px solid #eee;
  margin-bottom: 3rem;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.logo a:hover {
  color: #333;
}

.nav {
  display: flex;
  gap: 1.5rem;
}

.nav a {
  font-size: 0.875rem;
  font-weight: 500;
  color: #666;
}

.nav a:hover {
  color: #333;
}

/* ===== 页脚 ===== */
.footer {
  padding: 3rem 0;
  margin-top: 4rem;
  border-top: 1px solid #eee;
  text-align: center;
}

.footer p {
  font-size: 0.875rem;
  color: #999;
}

/* ===== 首页英雄区 ===== */
.hero {
  text-align: center;
  padding: 3rem 0;
  margin-bottom: 3rem;
}

.hero h1 {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 1rem;
  letter-spacing: -0.02em;
}

.hero p {
  font-size: 1.125rem;
  color: #666;
  max-width: 500px;
  margin: 0 auto;
}

/* ===== 特色内容卡片 ===== */
.featured-section {
  margin-bottom: 3rem;
}

.featured-grid {
  display: grid;
  gap: 1.5rem;
}

.featured-card {
  padding: 1.5rem;
  border: 1px solid #eee;
  border-radius: 4px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.featured-card:hover {
  border-color: #ddd;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}

.featured-card h3 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.featured-card p {
  font-size: 0.9375rem;
  color: #666;
  line-height: 1.6;
}

/* ===== 内容列表 ===== */
.content-section {
  margin-bottom: 3rem;
}

.section-title {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: #999;
  margin-bottom: 1.5rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid #eee;
}

.content-list {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.content-item {
  padding-bottom: 1.25rem;
  border-bottom: 1px solid #f5f5f5;
}

.content-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.content-item h3 {
  font-size: 1.0625rem;
  font-weight: 600;
  margin-bottom: 0.375rem;
}

.content-item h3 a:hover {
  color: #666;
}

.content-meta {
  font-size: 0.8125rem;
  color: #999;
}

.content-item p {
  font-size: 0.9375rem;
  color: #666;
  margin-top: 0.5rem;
  line-height: 1.6;
}

/* ===== 侧边栏组件 ===== */
.sidebar-section {
  margin-bottom: 2.5rem;
}

.sidebar-section .section-title {
  margin-bottom: 1rem;
}

.sidebar-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.sidebar-list li {
  font-size: 0.9375rem;
}

.sidebar-list a {
  display: block;
  padding: 0.25rem 0;
}

.sidebar-list a:hover {
  padding-left: 0.5rem;
}

/* ===== 分类页 ===== */
.category-header {
  text-align: center;
  padding: 2rem 0 3rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid #eee;
}

.category-header h1 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.category-header p {
  font-size: 1rem;
  color: #666;
}

/* ===== 分页 ===== */
.pagination {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin: 3rem 0;
}

.pagination a,
.pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.5rem;
  height: 2.5rem;
  padding: 0 0.75rem;
  font-size: 0.875rem;
  border: 1px solid #eee;
  border-radius: 4px;
}

.pagination a:hover {
  border-color: #ddd;
  background-color: #fafafa;
}

.pagination .current {
  background-color: #333;
  color: #fff;
  border-color: #333;
}

/* ===== 文章页 ===== */
.article-header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.article-header h1 {
  font-size: 1.875rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 1rem;
  letter-spacing: -0.01em;
}

.article-meta {
  font-size: 0.875rem;
  color: #999;
}

.article-meta span {
  margin: 0 0.5rem;
}

.article-featured-image {
  margin-bottom: 2.5rem;
}

.article-featured-image img {
  width: 100%;
  border-radius: 4px;
}

.article-body {
  font-size: 1.0625rem;
  line-height: 1.9;
}

.article-body h2 {
  font-size: 1.375rem;
  font-weight: 600;
  margin: 2.5rem 0 1rem;
  letter-spacing: -0.01em;
}

.article-body h3 {
  font-size: 1.1875rem;
  font-weight: 600;
  margin: 2rem 0 0.875rem;
}

.article-body p {
  margin-bottom: 1.5rem;
}

.article-body ul,
.article-body ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.article-body ul li {
  list-style: disc;
  margin-bottom: 0.5rem;
}

.article-body ol li {
  list-style: decimal;
  margin-bottom: 0.5rem;
}

.article-body blockquote {
  margin: 2rem 0;
  padding: 1rem 1.5rem;
  border-left: 3px solid #333;
  background-color: #fafafa;
  font-style: italic;
  color: #555;
}

.article-body img {
  margin: 2rem 0;
  border-radius: 4px;
}

.article-tags {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid #eee;
}

.article-tags a {
  display: inline-block;
  font-size: 0.8125rem;
  color: #666;
  margin-right: 1rem;
}

.article-tags a::before {
  content: "#";
}

.article-tags a:hover {
  color: #333;
}

/* ===== 相关文章 ===== */
.related-articles {
  margin-top: 3rem;
}

.related-articles h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.related-grid {
  display: grid;
  gap: 1rem;
}

.related-item {
  padding: 1rem;
  border: 1px solid #eee;
  border-radius: 4px;
}

.related-item h4 {
  font-size: 0.9375rem;
  font-weight: 500;
  margin-bottom: 0.25rem;
}

.related-item p {
  font-size: 0.8125rem;
  color: #999;
}

/* ===== 404页面 ===== */
.error-page {
  text-align: center;
  padding: 6rem 0;
}

.error-code {
  font-size: 6rem;
  font-weight: 700;
  color: #eee;
  line-height: 1;
  margin-bottom: 1rem;
}

.error-page h1 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 1rem;
}

.error-page p {
  font-size: 1rem;
  color: #666;
  margin-bottom: 2rem;
}

.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  font-size: 0.9375rem;
  font-weight: 500;
  color: #fff;
  background-color: #333;
  border-radius: 4px;
  transition: background-color 0.2s ease;
}

.btn:hover {
  background-color: #555;
  color: #fff;
}

/* ===== 响应式设计 ===== */
@media (max-width: 768px) {
  .container {
    padding: 0 1rem;
  }

  .header {
    padding: 1.5rem 0;
    margin-bottom: 2rem;
  }

  .header-inner {
    flex-direction: column;
    text-align: center;
  }

  .nav {
    gap: 1rem;
  }

  .hero {
    padding: 2rem 0;
  }

  .hero h1 {
    font-size: 1.625rem;
  }

  .hero p {
    font-size: 1rem;
  }

  .article-header h1 {
    font-size: 1.5rem;
  }

  .article-body {
    font-size: 1rem;
  }

  .error-code {
    font-size: 4rem;
  }
}

@media (max-width: 480px) {
  .featured-card {
    padding: 1rem;
  }

  .pagination a,
  .pagination span {
    min-width: 2rem;
    height: 2rem;
    font-size: 0.8125rem;
  }
}