/* ============================================
   马拉松 - 马赛克杂志风格样式
   主色调: #673ab7 (紫色)
   ============================================ */

/* CSS 变量 */
:root {
  --accent-color: #673ab7;
  --accent-light: #7e57c2;
  --accent-dark: #512da8;
  --text-primary: #333;
  --text-secondary: #666;
  --text-muted: #999;
  --bg-primary: #fff;
  --bg-secondary: #f5f5f5;
  --bg-dark: #1a1a1a;
  --border-color: #e0e0e0;
  --shadow: 0 2px 8px rgba(0,0,0,0.1);
  --shadow-hover: 0 4px 16px rgba(0,0,0,0.15);
  --radius: 8px;
  --radius-lg: 12px;
  --max-width: 1200px;
  --gap: 24px;
  --gap-sm: 16px;
}

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

html {
  font-size: 16px;
}

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

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

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

/* ============================================
   通用组件
   ============================================ */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gap);
}

.section-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: var(--gap-sm);
  padding-bottom: 8px;
  border-bottom: 3px solid var(--accent-color);
  display: inline-block;
}

.card {
  background: var(--bg-primary);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.3s, box-shadow 0.3s;
}

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

.card-image {
  width: 100%;
  aspect-ratio: 16/10;
  object-fit: cover;
}

.card-content {
  padding: var(--gap-sm);
}

.card-category {
  font-size: 0.75rem;
  color: var(--accent-color);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 8px;
}

.card-title {
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--text-primary);
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

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

/* 按钮 */
.btn {
  display: inline-block;
  padding: 10px 24px;
  background: var(--accent-color);
  color: #fff;
  border-radius: var(--radius);
  font-weight: 600;
  transition: background 0.3s;
}

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

.btn-outline {
  background: transparent;
  border: 2px solid var(--accent-color);
  color: var(--accent-color);
}

.btn-outline:hover {
  background: var(--accent-color);
  color: #fff;
}

/* 标签 */
.tag {
  display: inline-block;
  padding: 4px 12px;
  background: var(--bg-secondary);
  border-radius: 20px;
  font-size: 0.875rem;
  color: var(--text-secondary);
  margin-right: 8px;
  margin-bottom: 8px;
  transition: all 0.3s;
}

.tag:hover {
  background: var(--accent-color);
  color: #fff;
}

/* 面包屑 */
.breadcrumb {
  padding: var(--gap-sm) 0;
  font-size: 0.875rem;
  color: var(--text-muted);
}

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

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

.breadcrumb span {
  margin: 0 8px;
}

/* 文章列表项 */
.article-list-item {
  padding: 12px 0;
  border-bottom: 1px solid var(--border-color);
}

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

.article-list-item a {
  display: flex;
  align-items: center;
  gap: 12px;
}

.article-list-item .num {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg-secondary);
  border-radius: 50%;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text-secondary);
  flex-shrink: 0;
}

.article-list-item:nth-child(1) .num { background: #ff6b6b; color: #fff; }
.article-list-item:nth-child(2) .num { background: #ffa726; color: #fff; }
.article-list-item:nth-child(3) .num { background: #66bb6a; color: #fff; }

.article-list-item .title {
  font-size: 0.9375rem;
  color: var(--text-primary);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 1;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

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

/* ============================================
   Header 页头
   ============================================ */

.header {
  background: var(--bg-primary);
  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;
  height: 64px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-icon {
  width: 40px;
  height: 40px;
  background: var(--accent-color);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1.25rem;
  font-weight: 700;
}

.logo-text {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
}

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

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

.nav a {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.3s;
  position: relative;
}

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

.nav a.active::after {
  content: '';
  position: absolute;
  bottom: -20px;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent-color);
}

.header-search {
  display: flex;
  align-items: center;
  gap: 16px;
}

.search-box {
  position: relative;
}

.search-box input {
  width: 200px;
  padding: 8px 16px 8px 40px;
  border: 1px solid var(--border-color);
  border-radius: 24px;
  font-size: 0.875rem;
  outline: none;
  transition: all 0.3s;
}

.search-box input:focus {
  border-color: var(--accent-color);
  width: 240px;
}

.search-box::before {
  content: '🔍';
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 0.875rem;
}

/* ============================================
   Footer 页脚
   ============================================ */

.footer {
  background: var(--bg-dark);
  color: #fff;
  padding: 48px 0 24px;
  margin-top: 48px;
}

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

.footer-brand .logo-text {
  color: #fff;
  margin-bottom: 16px;
}

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.875rem;
  line-height: 1.8;
}

.footer-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: #fff;
}

.footer-links li {
  margin-bottom: 12px;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.875rem;
  transition: color 0.3s;
}

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

.footer-bottom {
  border-top: 1px solid #333;
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* ============================================
   首页布局
   ============================================ */

.hero-section {
  padding: 32px 0;
}

.hero-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--gap);
}

.headline-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  height: 100%;
  min-height: 400px;
}

.headline-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.headline-content {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 48px 32px 32px;
  background: linear-gradient(transparent, rgba(0,0,0,0.8));
  color: #fff;
}

.headline-content .card-category {
  color: #fff;
  background: var(--accent-color);
  display: inline-block;
  padding: 4px 12px;
  border-radius: 4px;
}

.headline-content .card-title {
  font-size: 1.75rem;
  color: #fff;
  margin: 16px 0;
}

.headline-content .card-meta {
  color: rgba(255,255,255,0.8);
}

.sidebar-widgets {
  display: flex;
  flex-direction: column;
  gap: var(--gap);
}

.widget {
  background: var(--bg-secondary);
  border-radius: var(--radius);
  padding: var(--gap-sm);
}

.widget-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--gap-sm);
  padding-bottom: 8px;
  border-bottom: 2px solid var(--accent-color);
}

/* 特色内容区 */
.features-section {
  padding: 32px 0;
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  grid-template-rows: auto auto;
  gap: var(--gap);
}

.feature-large {
  grid-row: span 2;
}

.feature-large .card-image {
  aspect-ratio: 3/4;
}

.feature-large .card-title {
  font-size: 1.25rem;
}

/* 三栏文章列表 */
.articles-section {
  padding: 32px 0;
  background: var(--bg-secondary);
}

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

.articles-col {
  background: var(--bg-primary);
  border-radius: var(--radius);
  padding: var(--gap-sm);
}

.articles-col .section-title {
  font-size: 1.125rem;
}

/* ============================================
   分类页布局
   ============================================ */

.category-hero {
  padding: 32px 0;
}

.category-hero-grid {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--gap);
}

.category-info {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  min-height: 300px;
}

.category-info img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  position: absolute;
  top: 0;
  left: 0;
}

.category-info-content {
  position: relative;
  z-index: 1;
  padding: 48px;
  background: linear-gradient(90deg, rgba(103,58,183,0.95), rgba(103,58,183,0.7));
  color: #fff;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.category-info-content h1 {
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.category-info-content p {
  font-size: 1.125rem;
  opacity: 0.9;
}

.category-stats {
  display: flex;
  gap: 32px;
  margin-top: 24px;
}

.category-stats .stat {
  text-align: center;
}

.category-stats .stat-num {
  font-size: 2rem;
  font-weight: 700;
}

.category-stats .stat-label {
  font-size: 0.875rem;
  opacity: 0.8;
}

/* 分类内容网格 */
.category-content {
  padding: 32px 0;
}

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

.category-grid .card:first-child {
  grid-column: span 2;
  grid-row: span 2;
}

.category-grid .card:first-child .card-image {
  aspect-ratio: 16/10;
}

.category-grid .card:first-child .card-title {
  font-size: 1.5rem;
}

/* 推荐文章区 */
.recommended-section {
  padding: 32px 0;
  background: var(--bg-secondary);
}

.recommended-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: var(--gap);
}

.recommended-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
}

/* ============================================
   文章页布局
   ============================================ */

.article-section {
  padding: 32px 0;
}

.article-grid {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: var(--gap);
}

.article-header {
  margin-bottom: var(--gap);
}

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

.article-category {
  background: var(--accent-color);
  color: #fff;
  padding: 4px 12px;
  border-radius: 4px;
  font-size: 0.875rem;
  font-weight: 600;
}

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

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

.article-image {
  width: 100%;
  border-radius: var(--radius-lg);
  margin-bottom: var(--gap);
}

.article-content {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--text-primary);
}

.article-content p {
  margin-bottom: 1.5em;
}

.article-content h2 {
  font-size: 1.5rem;
  margin: 2em 0 1em;
  padding-bottom: 0.5em;
  border-bottom: 2px solid var(--border-color);
}

.article-content h3 {
  font-size: 1.25rem;
  margin: 1.5em 0 0.75em;
}

.article-content ul,
.article-content ol {
  margin-bottom: 1.5em;
  padding-left: 1.5em;
}

.article-content li {
  margin-bottom: 0.5em;
}

.article-content blockquote {
  border-left: 4px solid var(--accent-color);
  padding-left: 1em;
  margin: 1.5em 0;
  color: var(--text-secondary);
  font-style: italic;
}

/* 内联媒体 */
.inline-media {
  margin: 2em 0;
  border-radius: var(--radius);
  overflow: hidden;
}

.inline-media img {
  width: 100%;
}

.inline-media-caption {
  padding: 12px;
  background: var(--bg-secondary);
  font-size: 0.875rem;
  color: var(--text-secondary);
  text-align: center;
}

/* 文章侧边栏 */
.article-sidebar .widget {
  margin-bottom: var(--gap);
}

.author-card {
  display: flex;
  align-items: center;
  gap: 16px;
}

.author-avatar {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  object-fit: cover;
}

.author-info h4 {
  font-size: 1rem;
  margin-bottom: 4px;
}

.author-info p {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* 标签云 */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
}

/* ============================================
   404页面
   ============================================ */

.error-section {
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 48px 0;
}

.error-content {
  max-width: 480px;
}

.error-code {
  font-size: 8rem;
  font-weight: 700;
  color: var(--accent-color);
  line-height: 1;
  margin-bottom: 16px;
}

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

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

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

/* ============================================
   响应式设计
   ============================================ */

@media (max-width: 1024px) {
  .hero-grid,
  .category-hero-grid,
  .article-grid {
    grid-template-columns: 1fr;
  }

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

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

  .feature-large {
    grid-row: span 1;
  }

  .feature-large .card-image {
    aspect-ratio: 16/10;
  }

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

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

  .category-grid .card:first-child {
    grid-column: span 2;
    grid-row: span 1;
  }

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

@media (max-width: 768px) {
  :root {
    --gap: 16px;
    --gap-sm: 12px;
  }

  .header-inner {
    flex-wrap: wrap;
    height: auto;
    padding: 12px 0;
  }

  .nav {
    order: 3;
    width: 100%;
    justify-content: center;
    gap: 20px;
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--border-color);
  }

  .nav a.active::after {
    bottom: -12px;
  }

  .search-box input {
    width: 150px;
  }

  .headline-content .card-title {
    font-size: 1.25rem;
  }

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

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

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

  .category-grid .card:first-child {
    grid-column: span 1;
  }

  .category-info-content h1 {
    font-size: 1.75rem;
  }

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

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

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

  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }

  .error-code {
    font-size: 5rem;
  }
}

@media (max-width: 480px) {
  .logo-text {
    font-size: 1.25rem;
  }

  .nav {
    gap: 12px;
    font-size: 0.875rem;
  }

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

  .error-actions {
    flex-direction: column;
  }
}