/* ============================================
   顺理成章 - 个人知识管理网站
   简约风格 · 内容导向 · 阅读优先
   ============================================ */

/* CSS 变量 */
:root {
  --color-primary: #2c3e50;
  --color-accent: #3a7bd5;
  --color-accent-light: #5b9bf0;
  --color-accent-dark: #2a5f9e;
  --color-text: #2d3436;
  --color-text-secondary: #636e72;
  --color-text-light: #9ca3af;
  --color-bg: #ffffff;
  --color-bg-subtle: #f8f9fa;
  --color-bg-card: #ffffff;
  --color-border: #e9ecef;
  --color-border-light: #f1f3f5;
  --color-tag-bg: #eef2f7;
  --color-tag-text: #4a6fa5;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.1);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Consolas", "Microsoft YaHei", monospace;
  --max-width: 960px;
  --transition: 0.2s ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

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

/* 容器 */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

/* ========== 头部导航 ========== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 32px;
  height: 64px;
}

.logo {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-primary);
  white-space: nowrap;
  flex-shrink: 0;
}

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

.main-nav {
  display: flex;
  gap: 4px;
  flex: 1;
}

.nav-link {
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  transition: all var(--transition);
}

.nav-link:hover {
  color: var(--color-primary);
  background: var(--color-bg-subtle);
}

.nav-link.active {
  color: var(--color-accent);
  background: var(--color-tag-bg);
}

/* 搜索框 */
.search-box {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  padding: 4px 4px 4px 16px;
  transition: all var(--transition);
  flex-shrink: 0;
}

.search-box:focus-within {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(58, 123, 213, 0.1);
}

.search-box input {
  border: none;
  background: none;
  outline: none;
  font-size: 0.85rem;
  width: 140px;
  color: var(--color-text);
  font-family: var(--font-sans);
}

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

.search-box button {
  border: none;
  background: var(--color-accent);
  color: white;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background var(--transition);
  flex-shrink: 0;
}

.search-box button:hover {
  background: var(--color-accent-dark);
}

/* 移动端菜单按钮 */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.menu-toggle span {
  width: 22px;
  height: 2px;
  background: var(--color-text);
  border-radius: 2px;
  transition: all var(--transition);
}

.menu-toggle.open span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.menu-toggle.open span:nth-child(2) {
  opacity: 0;
}
.menu-toggle.open span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ========== 主内容区 ========== */
.main-content {
  flex: 1;
}

.page-body {
  padding: 40px 24px 60px;
}

/* ========== 首页 Hero ========== */
.hero-section {
  background: linear-gradient(135deg, #f0f4f8 0%, #e8eef5 100%);
  padding: 80px 24px;
  text-align: center;
  border-bottom: 1px solid var(--color-border);
}

.hero-title {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: 1.15rem;
  color: var(--color-text-secondary);
  margin-bottom: 32px;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
}

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  padding: 10px 24px;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  border: 1.5px solid transparent;
}

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

.btn-primary:hover {
  background: var(--color-accent-dark);
  color: white;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-outline {
  border-color: var(--color-border);
  color: var(--color-text-secondary);
  background: white;
}

.btn-outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ========== Section 通用 ========== */
.section {
  margin-bottom: 56px;
}

.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.section-title {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-primary);
}

.section-more {
  font-size: 0.85rem;
  color: var(--color-accent);
  font-weight: 500;
}

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

.article-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: all var(--transition);
}

.article-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-accent-light);
}

.card-link {
  display: block;
  color: inherit;
}

.card-body {
  padding: 20px;
}

.card-category {
  display: inline-block;
  font-size: 0.75rem;
  color: var(--color-tag-text);
  background: var(--color-tag-bg);
  padding: 2px 10px;
  border-radius: 12px;
  margin-bottom: 10px;
  font-weight: 500;
}

.card-title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 8px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-summary {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 12px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card-meta {
  display: flex;
  gap: 12px;
  font-size: 0.78rem;
  color: var(--color-text-light);
}

/* ========== 分类卡片 ========== */
.category-cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
}

.category-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 24px 20px;
  background: var(--color-bg-subtle);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  transition: all var(--transition);
  color: var(--color-text);
}

.category-card:hover {
  background: white;
  border-color: var(--color-accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  color: var(--color-accent);
}

.cat-name {
  font-size: 1rem;
  font-weight: 600;
}

.cat-count {
  font-size: 0.8rem;
  color: var(--color-text-light);
}

/* ========== 页面标题 ========== */
.page-header {
  margin-bottom: 32px;
}

.page-title {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.page-subtitle {
  font-size: 0.9rem;
  color: var(--color-text-light);
}

/* ========== 筛选栏 ========== */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.filter-tag {
  padding: 6px 16px;
  border-radius: 20px;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  transition: all var(--transition);
  cursor: pointer;
}

.filter-tag:hover {
  color: var(--color-accent);
  border-color: var(--color-accent-light);
}

.filter-tag.active {
  background: var(--color-accent);
  color: white;
  border-color: var(--color-accent);
}

/* ========== 标签云 ========== */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border-light);
}

.tag-item {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 12px;
  font-size: 0.82rem;
  color: var(--color-tag-text);
  background: var(--color-tag-bg);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.tag-item:hover {
  background: var(--color-accent);
  color: white;
}

.tag-item.active {
  background: var(--color-accent);
  color: white;
}

.tag-count {
  font-size: 0.72rem;
  opacity: 0.7;
}

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

.list-item {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition);
}

.list-item:hover {
  border-color: var(--color-accent-light);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.list-item-link {
  display: block;
  color: inherit;
  padding: 20px 24px;
}

.list-item-meta {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-bottom: 8px;
  font-size: 0.8rem;
  color: var(--color-text-light);
}

.meta-category {
  color: var(--color-tag-text);
  background: var(--color-tag-bg);
  padding: 2px 10px;
  border-radius: 12px;
  font-weight: 500;
}

.list-item-title {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 6px;
  line-height: 1.4;
}

.list-item:hover .list-item-title {
  color: var(--color-accent);
}

.list-item-summary {
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  margin-bottom: 10px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

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

.mini-tag {
  font-size: 0.72rem;
  color: var(--color-text-light);
  background: var(--color-bg-subtle);
  padding: 1px 8px;
  border-radius: 4px;
}

/* ========== 分页 ========== */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 6px;
  margin-top: 40px;
}

.page-btn {
  display: inline-flex;
  align-items: center;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
  background: white;
  transition: all var(--transition);
  cursor: pointer;
}

.page-btn:hover:not(.disabled):not(.current) {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.page-btn.current {
  background: var(--color-accent);
  color: white;
  border-color: var(--color-accent);
  font-weight: 600;
}

.page-btn.disabled {
  opacity: 0.4;
  cursor: default;
}

.page-ellipsis {
  color: var(--color-text-light);
  padding: 0 4px;
}

/* ========== 空状态 ========== */
.empty-state {
  text-align: center;
  padding: 80px 24px;
}

.empty-state p {
  color: var(--color-text-light);
  margin-bottom: 20px;
  font-size: 1.05rem;
}

/* ========== 文章详情页 ========== */
.article-detail {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 24px 60px;
}

.back-link {
  display: inline-block;
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin-bottom: 24px;
  transition: color var(--transition);
}

.back-link:hover {
  color: var(--color-accent);
}

.article-header {
  margin-bottom: 32px;
}

.article-meta-row {
  display: flex;
  gap: 12px;
  align-items: center;
  margin-bottom: 16px;
  font-size: 0.85rem;
  color: var(--color-text-light);
}

.article-title {
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-primary);
  line-height: 1.3;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

.article-summary {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* 文章正文排版 */
.article-content {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--color-text);
}

.article-content h2 {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-primary);
  margin: 36px 0 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-border-light);
}

.article-content h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-primary);
  margin: 28px 0 12px;
}

.article-content p {
  margin-bottom: 16px;
}

.article-content ul, .article-content ol {
  margin: 12px 0 16px 20px;
}

.article-content li {
  margin-bottom: 6px;
}

.article-content blockquote {
  border-left: 4px solid var(--color-accent);
  padding: 12px 20px;
  margin: 20px 0;
  background: var(--color-bg-subtle);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--color-text-secondary);
}

.article-content blockquote p {
  margin-bottom: 0;
}

.article-content code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: var(--color-tag-bg);
  padding: 2px 6px;
  border-radius: 4px;
  color: #c0392b;
}

.article-content pre {
  background: #1e272e;
  color: #d2dae2;
  padding: 18px 20px;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin: 20px 0;
  font-size: 0.85rem;
  line-height: 1.6;
}

.article-content pre code {
  background: none;
  color: inherit;
  padding: 0;
  font-size: inherit;
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 0.9rem;
}

.article-content th, .article-content td {
  border: 1px solid var(--color-border);
  padding: 10px 14px;
  text-align: left;
}

.article-content th {
  background: var(--color-bg-subtle);
  font-weight: 600;
  color: var(--color-primary);
}

.article-content img {
  border-radius: var(--radius-sm);
  margin: 20px 0;
}

.article-content a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-color: var(--color-accent-light);
  text-underline-offset: 2px;
}

.article-content hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: 32px 0;
}

/* 文章标签 */
.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 32px;
}

.article-divider {
  border: none;
  border-top: 1px solid var(--color-border-light);
  margin: 40px 0;
}

/* 相关文章 */
.related-articles {
  margin-top: 8px;
}

.related-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.related-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.related-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 18px;
  background: var(--color-bg-subtle);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  color: var(--color-text);
}

.related-item:hover {
  background: white;
  box-shadow: var(--shadow-sm);
  color: var(--color-accent);
}

.related-cat {
  font-size: 0.75rem;
  color: var(--color-tag-text);
  background: var(--color-tag-bg);
  padding: 2px 8px;
  border-radius: 10px;
  flex-shrink: 0;
}

.related-name {
  flex: 1;
  font-size: 0.9rem;
  font-weight: 500;
}

.related-date {
  font-size: 0.78rem;
  color: var(--color-text-light);
  flex-shrink: 0;
}

/* ========== 资源收藏页 ========== */
.resource-search {
  margin-bottom: 24px;
}

.resource-search form {
  display: flex;
  gap: 8px;
  max-width: 400px;
}

.resource-search input {
  flex: 1;
  padding: 10px 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  outline: none;
  font-family: var(--font-sans);
  transition: border var(--transition);
}

.resource-search input:focus {
  border-color: var(--color-accent);
}

.resource-search button {
  padding: 10px 20px;
  background: var(--color-accent);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.9rem;
  font-family: var(--font-sans);
  transition: background var(--transition);
}

.resource-search button:hover {
  background: var(--color-accent-dark);
}

.resource-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}

.resource-card {
  display: block;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition);
  color: var(--color-text);
}

.resource-card:hover {
  border-color: var(--color-accent-light);
  box-shadow: var(--shadow-lg);
  transform: translateY(-3px);
  color: var(--color-text);
}

.resource-card-body {
  padding: 20px;
}

.resource-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 10px;
}

.resource-category {
  font-size: 0.75rem;
  color: var(--color-tag-text);
  background: var(--color-tag-bg);
  padding: 2px 10px;
  border-radius: 12px;
  font-weight: 500;
}

.resource-date {
  font-size: 0.78rem;
  color: var(--color-text-light);
}

.resource-name {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.resource-desc {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: 12px;
}

.resource-tags {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  margin-bottom: 12px;
}

.resource-link-hint {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.82rem;
  color: var(--color-accent);
  font-weight: 500;
  padding-top: 12px;
  border-top: 1px solid var(--color-border-light);
}

/* ========== 关于我页 ========== */
.about-page {
  max-width: 680px;
  margin: 0 auto;
}

.about-hero {
  text-align: center;
  padding: 48px 0 40px;
}

.about-avatar img,
.avatar-placeholder {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 20px;
}

.avatar-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent);
  color: white;
  font-size: 2.5rem;
  font-weight: 700;
  margin: 0 auto 20px;
}

.about-name {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.about-tagline {
  font-size: 1rem;
  color: var(--color-text-secondary);
}

.about-section {
  margin-bottom: 40px;
}

.about-section-title {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-border-light);
}

.about-bio {
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--color-text);
}

.about-motto {
  border-left: 4px solid var(--color-accent);
  padding: 16px 24px;
  background: var(--color-bg-subtle);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  font-style: italic;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 12px;
}

.skill-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  background: var(--color-bg-subtle);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

.skill-name {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-text);
}

.skill-level {
  font-size: 0.78rem;
  color: var(--color-tag-text);
  background: var(--color-tag-bg);
  padding: 2px 10px;
  border-radius: 10px;
}

.interests-list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.interest-tag {
  padding: 8px 16px;
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  transition: all var(--transition);
}

.interest-tag:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.learning-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.learning-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.92rem;
  color: var(--color-text);
  padding: 10px 16px;
  background: var(--color-bg-subtle);
  border-radius: var(--radius-sm);
}

.learning-dot {
  width: 8px;
  height: 8px;
  background: var(--color-accent);
  border-radius: 50%;
  flex-shrink: 0;
}

.contact-list {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  transition: all var(--transition);
}

.contact-item:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: white;
}

.contact-icon {
  font-size: 1.1rem;
}

/* ========== 404 页 ========== */
.error-page {
  text-align: center;
  padding: 80px 24px;
}

.error-code {
  font-size: 5rem;
  font-weight: 800;
  color: var(--color-accent);
  margin-bottom: 16px;
}

.error-message {
  font-size: 1.3rem;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.error-hint {
  color: var(--color-text-light);
  margin-bottom: 28px;
}

/* ========== 页脚 ========== */
.site-footer {
  background: var(--color-bg-subtle);
  border-top: 1px solid var(--color-border);
  padding: 40px 0 24px;
  margin-top: auto;
}

.footer-inner {
  text-align: center;
}

.footer-left {
  margin-bottom: 16px;
}

.footer-site-name {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.footer-tagline {
  font-size: 0.85rem;
  color: var(--color-text-light);
}

.footer-nav {
  display: flex;
  justify-content: center;
  gap: 24px;
  margin-bottom: 20px;
}

.footer-nav a {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}

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

.footer-copy {
  font-size: 0.8rem;
  color: var(--color-text-light);
  padding-top: 16px;
  border-top: 1px solid var(--color-border);
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
  .header-inner {
    gap: 16px;
  }

  .main-nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: white;
    border-bottom: 1px solid var(--color-border);
    padding: 12px;
    gap: 4px;
  }

  .main-nav.open {
    display: flex;
  }

  .nav-link {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
  }

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

  .search-box input {
    width: 100%;
  }

  .menu-toggle {
    display: flex;
  }

  .hero-section {
    padding: 56px 24px;
  }

  .hero-title {
    font-size: 1.8rem;
  }

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

  .hero-actions {
    flex-direction: column;
    gap: 10px;
  }

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

  .article-title {
    font-size: 1.5rem;
  }

  .article-detail {
    padding: 32px 20px 48px;
  }

  .section-title {
    font-size: 1.2rem;
  }

  .page-title {
    font-size: 1.4rem;
  }

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

  .related-item {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  .footer-nav {
    flex-wrap: wrap;
    gap: 16px;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .search-box {
    display: none;
  }

  .card-body {
    padding: 16px;
  }

  .list-item-link {
    padding: 16px;
  }

  .article-content pre {
    font-size: 0.78rem;
    padding: 14px;
  }
}

/* ========== 滚动动画 ========== */
.article-card,
.list-item,
.resource-card,
.category-card {
  animation: fadeInUp 0.4s ease;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* 代码块语法高亮基础色 */
.article-content pre .hljs-keyword { color: #ff79c6; }
.article-content pre .hljs-string { color: #f1fa8c; }
.article-content pre .hljs-comment { color: #6272a4; }
.article-content pre .hljs-number { color: #bd93f9; }
.article-content pre .hljs-function { color: #50fa7b; }
.article-content pre .hljs-built_in { color: #8be9fd; }