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

/* CSS 变量定义 */
:root {
  --accent-color: #673ab7;
  --accent-light: #9575cd;
  --accent-dark: #512da8;
  --text-primary: #333;
  --text-secondary: #666;
  --text-muted: #999;
  --bg-primary: #fff;
  --bg-secondary: #f5f5f5;
  --bg-dark: #1a1a2e;
  --border-color: #e0e0e0;
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.15);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.2);
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --max-width: 1200px;
  --gap: 20px;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

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

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.3s ease;
}

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

ul {
  list-style: none;
}

/* ============================================
   页头 Header
   ============================================ */
.header {
  background: linear-gradient(135deg, var(--accent-dark) 0%, var(--accent-color) 100%);
  color: var(--bg-primary);
  padding: 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow-md);
}

.header-top {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 15px var(--gap);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.logo span {
  color: #ffd700;
}

.tagline {
  font-size: 0.85rem;
  opacity: 0.9;
  margin-top: 2px;
}

.nav {
  display: flex;
  gap: 30px;
}

.nav a {
  font-size: 0.95rem;
  font-weight: 500;
  padding: 5px 0;
  border-bottom: 2px solid transparent;
  transition: all 0.3s ease;
}

.nav a:hover,
.nav a.active {
  border-bottom-color: #ffd700;
  color: #ffd700;
}

/* ============================================
   面包屑导航 Breadcrumb
   ============================================ */
.breadcrumb {
  background: var(--bg-secondary);
  padding: 12px 0;
  border-bottom: 1px solid var(--border-color);
}

.breadcrumb-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gap);
  font-size: 0.85rem;
  color: var(--text-secondary);
}

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

.breadcrumb a:hover {
  text-decoration: underline;
}

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

/* ============================================
   主容器
   ============================================ */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--gap);
}

/* ============================================
   马赛克网格布局
   ============================================ */
.mosaic-grid {
  display: grid;
  gap: var(--gap);
  margin-bottom: 40px;
}

/* 首页网格 */
.home-grid {
  grid-template-columns: 2fr 1fr;
  grid-template-rows: auto auto auto;
  grid-template-areas:
    "headline sidebar"
    "feature stories-top"
    "feature stories-bottom";
}

/* 分类页网格 */
.category-grid {
  grid-template-columns: 1fr 300px;
  grid-template-areas:
    "hero sidebar"
    "content content";
}

/* 文章页网格 */
.article-grid {
  grid-template-columns: 1fr 320px;
  grid-template-areas:
    "header sidebar"
    "content sidebar";
  gap: 30px;
}

/* ============================================
   卡片组件
   ============================================ */
.card {
  background: var(--bg-primary);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

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

.card-image {
  position: relative;
  overflow: hidden;
}

.card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.card:hover .card-image img {
  transform: scale(1.05);
}

.card-category {
  position: absolute;
  top: 12px;
  left: 12px;
  background: var(--accent-color);
  color: white;
  padding: 4px 12px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
}

.card-content {
  padding: 20px;
}

.card-title {
  font-size: 1.1rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 10px;
  color: var(--text-primary);
}

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

.card-excerpt {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 12px;
}

.card-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  gap: 15px;
}

/* ============================================
   头条新闻 Headline
   ============================================ */
.headline {
  grid-area: headline;
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  min-height: 400px;
}

.headline-image {
  position: absolute;
  inset: 0;
}

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

.headline-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.8) 0%, rgba(0,0,0,0.3) 50%, transparent 100%);
}

.headline-content {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 30px;
  color: white;
}

.headline-category {
  display: inline-block;
  background: var(--accent-color);
  color: white;
  padding: 5px 15px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
  margin-bottom: 15px;
}

.headline-title {
  font-size: 1.8rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 12px;
}

.headline-title a {
  color: white;
}

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

.headline-excerpt {
  font-size: 1rem;
  opacity: 0.9;
  line-height: 1.6;
}

/* ============================================
   侧边栏 Sidebar
   ============================================ */
.sidebar {
  grid-area: sidebar;
  display: flex;
  flex-direction: column;
  gap: var(--gap);
}

.widget {
  background: var(--bg-secondary);
  border-radius: var(--radius-md);
  padding: 20px;
}

.widget-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 15px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--accent-color);
}

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

.widget-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
}

.widget-item-number {
  width: 24px;
  height: 24px;
  background: var(--accent-color);
  color: white;
  font-size: 0.75rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  flex-shrink: 0;
}

.widget-item-content {
  flex: 1;
}

.widget-item-title {
  font-size: 0.9rem;
  font-weight: 500;
  line-height: 1.4;
  color: var(--text-primary);
}

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

.widget-item-meta {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ============================================
   特色内容 Feature
   ============================================ */
.feature-large {
  grid-area: feature;
}

.feature-large .card-image {
  height: 280px;
}

.feature-large .card-title {
  font-size: 1.3rem;
}

/* ============================================
   故事网格 Stories
   ============================================ */
.stories-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--gap);
}

.stories-top {
  grid-area: stories-top;
}

.stories-bottom {
  grid-area: stories-bottom;
}

.story-card .card-image {
  height: 140px;
}

.story-card .card-content {
  padding: 15px;
}

.story-card .card-title {
  font-size: 0.95rem;
}

/* ============================================
   三栏推荐区域
   ============================================ */
.recommendation-section {
  background: var(--bg-secondary);
  padding: 40px 0;
  margin: 40px 0;
}

.recommendation-grid {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gap);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}

.recommendation-column h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--accent-color);
}

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

.recommendation-item {
  display: flex;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--border-color);
}

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

.recommendation-item-dot {
  width: 6px;
  height: 6px;
  background: var(--accent-color);
  border-radius: 50%;
  margin-top: 8px;
  flex-shrink: 0;
}

.recommendation-item-content {
  flex: 1;
}

.recommendation-item-title {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-primary);
  line-height: 1.4;
}

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

.recommendation-item-meta {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* ============================================
   分类页 Hero
   ============================================ */
.category-hero {
  grid-area: hero;
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  min-height: 300px;
}

.category-hero-image {
  position: absolute;
  inset: 0;
}

.category-hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.category-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to right, rgba(103,58,183,0.9) 0%, rgba(103,58,183,0.6) 50%, transparent 100%);
}

.category-hero-content {
  position: relative;
  padding: 40px;
  color: white;
  max-width: 60%;
}

.category-hero-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 15px;
}

.category-hero-desc {
  font-size: 1rem;
  line-height: 1.7;
  opacity: 0.95;
}

/* ============================================
   分类内容网格
   ============================================ */
.category-content {
  grid-area: content;
}

.category-lead {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: var(--gap);
  margin-bottom: var(--gap);
}

.lead-story {
  grid-row: span 1;
}

.lead-story .card-image {
  height: 200px;
}

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

.category-item .card-image {
  height: 160px;
}

/* ============================================
   文章页 Article
   ============================================ */
.article-header {
  grid-area: header;
  margin-bottom: 20px;
}

.article-category {
  display: inline-block;
  background: var(--accent-color);
  color: white;
  padding: 5px 15px;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
  margin-bottom: 15px;
}

.article-title {
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.article-meta {
  display: flex;
  gap: 20px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.article-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 30px;
}

.article-image img {
  width: 100%;
  height: auto;
}

.article-content {
  grid-area: content;
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--text-primary);
}

.article-content h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin: 35px 0 20px;
  color: var(--text-primary);
}

.article-content h3 {
  font-size: 1.25rem;
  font-weight: 600;
  margin: 30px 0 15px;
  color: var(--text-primary);
}

.article-content p {
  margin-bottom: 20px;
}

.article-content ul,
.article-content ol {
  margin-bottom: 20px;
  padding-left: 25px;
}

.article-content ul li {
  list-style: disc;
  margin-bottom: 8px;
}

.article-content ol li {
  list-style: decimal;
  margin-bottom: 8px;
}

.article-content blockquote {
  border-left: 4px solid var(--accent-color);
  padding-left: 20px;
  margin: 25px 0;
  font-style: italic;
  color: var(--text-secondary);
}

.article-content img {
  border-radius: var(--radius-md);
  margin: 25px 0;
}

/* ============================================
   侧边栏组件
   ============================================ */
.author-widget {
  text-align: center;
  padding: 30px 20px;
}

.author-avatar {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  margin: 0 auto 15px;
  object-fit: cover;
}

.author-name {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 5px;
}

.author-bio {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 15px;
}

.tags-widget .tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tags-widget .tag {
  background: white;
  padding: 5px 12px;
  font-size: 0.8rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  transition: all 0.3s ease;
}

.tags-widget .tag:hover {
  background: var(--accent-color);
  color: white;
  border-color: var(--accent-color);
}

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

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

.error-code {
  font-size: 8rem;
  font-weight: 700;
  color: var(--accent-color);
  line-height: 1;
  margin-bottom: 20px;
  opacity: 0.8;
}

.error-title {
  font-size: 1.8rem;
  font-weight: 600;
  margin-bottom: 15px;
  color: var(--text-primary);
}

.error-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 30px;
}

.error-actions {
  display: flex;
  gap: 15px;
  justify-content: center;
}

.btn {
  display: inline-block;
  padding: 12px 30px;
  font-size: 0.95rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: all 0.3s ease;
  cursor: pointer;
  border: none;
}

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

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

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn-secondary:hover {
  background: var(--bg-secondary);
}

/* ============================================
   页脚 Footer
   ============================================ */
.footer {
  background: var(--bg-dark);
  color: white;
  padding: 50px 0 20px;
  margin-top: 60px;
}

.footer-grid {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gap);
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
}

.footer-brand .logo {
  font-size: 1.5rem;
  margin-bottom: 15px;
}

.footer-brand p {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.7);
  line-height: 1.7;
}

.footer-column h4 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 20px;
  color: white;
}

.footer-column ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-column a {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.7);
  transition: color 0.3s ease;
}

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

.footer-bottom {
  max-width: var(--max-width);
  margin: 40px auto 0;
  padding: 20px var(--gap) 0;
  border-top: 1px solid rgba(255,255,255,0.1);
  text-align: center;
  font-size: 0.85rem;
  color: rgba(255,255,255,0.5);
}

/* ============================================
   响应式设计
   ============================================ */
@media (max-width: 992px) {
  .home-grid {
    grid-template-columns: 1fr;
    grid-template-areas:
      "headline"
      "sidebar"
      "feature"
      "stories-top"
      "stories-bottom";
  }

  .category-grid {
    grid-template-columns: 1fr;
    grid-template-areas:
      "hero"
      "sidebar"
      "content";
  }

  .article-grid {
    grid-template-columns: 1fr;
    grid-template-areas:
      "header"
      "content"
      "sidebar";
  }

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

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

  .recommendation-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

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

  .headline {
    min-height: 300px;
  }

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

  .article-title {
    font-size: 1.6rem;
  }
}

@media (max-width: 768px) {
  .header-top {
    flex-direction: column;
    gap: 15px;
    padding: 15px;
  }

  .nav {
    gap: 20px;
    flex-wrap: wrap;
    justify-content: center;
  }

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

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

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

  .category-hero-content {
    max-width: 100%;
    padding: 25px;
  }

  .category-hero-title {
    font-size: 1.5rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

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

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

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

@media (max-width: 480px) {
  :root {
    --gap: 15px;
  }

  .headline-content {
    padding: 20px;
  }

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

  .widget {
    padding: 15px;
  }

  .recommendation-section {
    padding: 30px 0;
  }
}