/* ============================================
   吃瓜网 - 核心样式表
   网络梗百科与流行文化图鉴
   ============================================ */

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

/* === 全局导航 === */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  transition: background var(--transition-normal), box-shadow var(--transition-normal);
}
.site-header.scrolled {
  box-shadow: var(--shadow-md);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-md);
}
.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
}
.site-logo img {
  width: 36px;
  height: 36px;
  border-radius: 50%;
}
.header-search {
  flex: 1;
  max-width: 480px;
  margin: 0 var(--space-xl);
  position: relative;
}
.header-search input {
  width: 100%;
  padding: 10px 44px 10px 16px;
  border: 2px solid var(--border-color);
  border-radius: 24px;
  background: var(--card-bg);
  font-size: 0.9rem;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.header-search input:focus {
  border-color: var(--secondary);
  box-shadow: 0 0 0 3px rgba(78,205,196,0.15);
}
.header-search .search-btn {
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--secondary);
  font-size: 1.1rem;
}
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}
.main-nav a {
  font-size: 0.9rem;
  font-weight: 500;
  position: relative;
  padding: 4px 0;
}
.main-nav a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-rainbow);
  transition: width var(--transition-normal);
}
.main-nav a:hover::after,
.main-nav a.active::after {
  width: 100%;
}

/* === Hero Banner === */
.hero-section {
  margin-top: 64px;
  position: relative;
  overflow: hidden;
  background: var(--gradient-rainbow);
  padding: var(--space-3xl) 0;
}
.hero-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(255,255,255,0.1);
  backdrop-filter: blur(1px);
}
.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: #fff;
}
.hero-content h1 {
  font-size: 2.5rem;
  margin-bottom: var(--space-md);
  text-shadow: 0 2px 8px rgba(0,0,0,0.2);
}
.hero-content p {
  font-size: 1.2rem;
  opacity: 0.95;
  max-width: 600px;
  margin: 0 auto var(--space-lg);
}
.hero-image {
  margin-top: var(--space-xl);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.btn-primary {
  display: inline-block;
  padding: 12px 32px;
  background: var(--primary);
  color: #fff;
  border-radius: 24px;
  font-weight: 600;
  font-size: 1rem;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255,107,107,0.4);
  color: #fff;
}
.btn-secondary {
  display: inline-block;
  padding: 12px 32px;
  background: var(--secondary);
  color: #fff;
  border-radius: 24px;
  font-weight: 600;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}
.btn-secondary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(78,205,196,0.4);
  color: #fff;
}

/* === 热度排行榜 === */
.leaderboard-section {
  padding: var(--space-3xl) 0;
}
.section-title {
  font-size: 1.75rem;
  text-align: center;
  margin-bottom: var(--space-xl);
  position: relative;
}
.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background: var(--gradient-rainbow);
  margin: var(--space-sm) auto 0;
  border-radius: 2px;
}
.tab-nav {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  margin-bottom: var(--space-xl);
}
.tab-btn {
  padding: 8px 24px;
  border-radius: 20px;
  font-size: 0.9rem;
  font-weight: 500;
  border: 2px solid var(--border-color);
  transition: all var(--transition-fast);
}
.tab-btn.active, .tab-btn:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}
.rank-list {
  max-width: 700px;
  margin: 0 auto;
}
.rank-item {
  display: flex;
  align-items: center;
  padding: var(--space-md);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-sm);
  background: var(--card-bg);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}
.rank-item:hover {
  transform: translateX(4px);
  box-shadow: var(--shadow-sm);
}
.rank-item.top-3 {
  background: var(--gradient-rainbow);
  color: #fff;
}
.rank-num {
  font-size: 1.5rem;
  font-weight: 800;
  width: 48px;
  text-align: center;
  flex-shrink: 0;
}
.rank-info {
  flex: 1;
  margin-left: var(--space-md);
}
.rank-name {
  font-weight: 600;
  font-size: 1rem;
}
.rank-desc {
  font-size: 0.8rem;
  opacity: 0.7;
  margin-top: 2px;
}
.rank-heat {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--primary);
}
.rank-trend {
  margin-left: var(--space-sm);
  font-size: 0.8rem;
}
.trend-up { color: #FF6B6B; }
.trend-down { color: #4ECDC4; }
.trend-new { color: #FFD93D; font-weight: 700; }

/* === 梗图画廊网格 === */
.gallery-section {
  padding: var(--space-3xl) 0;
  background: var(--card-bg);
}
.meme-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--space-md);
}
.meme-card {
  background: var(--bg);
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 2px solid transparent;
  transition: all var(--transition-normal);
  position: relative;
}
.meme-card:hover {
  border-color: var(--primary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.meme-card img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
}
.meme-card-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  opacity: 0;
  transition: opacity var(--transition-fast);
}
.meme-card:hover .meme-card-overlay {
  opacity: 1;
}
.meme-card-overlay button {
  padding: 8px 16px;
  background: #fff;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 600;
}
.meme-card-info {
  padding: var(--space-sm) var(--space-md);
}
.meme-card-info h4 {
  font-size: 0.9rem;
  margin-bottom: 4px;
}
.meme-card-info .tags {
  display: flex;
  gap: var(--space-xs);
  flex-wrap: wrap;
}
.tag {
  display: inline-block;
  padding: 2px 8px;
  background: var(--card-bg);
  border-radius: 10px;
  font-size: 0.75rem;
  color: var(--secondary);
  border: 1px solid var(--border-color);
}

/* === 梗起源时间线 === */
.timeline-section {
  padding: var(--space-3xl) 0;
}
.timeline {
  position: relative;
  max-width: 800px;
  margin: 0 auto;
  padding-left: 40px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 16px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border-color);
}
.timeline-item {
  position: relative;
  margin-bottom: var(--space-xl);
  padding: var(--space-md);
  background: var(--card-bg);
  border-radius: var(--radius-md);
  animation: fadeInUp 0.6s ease forwards;
  opacity: 0;
}
.timeline-item:nth-child(1) { animation-delay: 0.1s; }
.timeline-item:nth-child(2) { animation-delay: 0.2s; }
.timeline-item:nth-child(3) { animation-delay: 0.3s; }
.timeline-item:nth-child(4) { animation-delay: 0.4s; }
.timeline-item::before {
  content: '';
  position: absolute;
  left: -32px;
  top: 20px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--accent);
  border: 3px solid var(--bg);
  box-shadow: 0 0 0 2px var(--accent);
}
.timeline-item.active::before {
  background: var(--primary);
  box-shadow: 0 0 0 2px var(--primary);
  animation: pulse 2s infinite;
}
.timeline-date {
  font-size: 0.8rem;
  color: var(--accent);
  font-weight: 600;
  font-family: var(--font-mono);
}
.timeline-title {
  font-size: 1.1rem;
  margin: var(--space-xs) 0;
}
.timeline-desc {
  font-size: 0.9rem;
  opacity: 0.8;
}

/* === 最新收录词条流 === */
.feed-section {
  padding: var(--space-3xl) 0;
}
.feed-list {
  max-width: 800px;
  margin: 0 auto;
}
.feed-item {
  display: flex;
  align-items: flex-start;
  padding: var(--space-lg);
  border-bottom: 1px solid var(--border-color);
  transition: background var(--transition-fast);
}
.feed-item:hover {
  background: var(--card-bg);
}
.feed-item-content {
  flex: 1;
}
.feed-item-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: var(--space-xs);
}
.feed-item-title a:hover {
  color: var(--primary);
}
.feed-item-desc {
  font-size: 0.9rem;
  color: #666;
  margin-bottom: var(--space-sm);
}
.feed-item-meta {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  font-size: 0.8rem;
  color: #999;
}

/* === 深度文章卡片 === */
.articles-section {
  padding: var(--space-3xl) 0;
  background: var(--card-bg);
}
.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-lg);
}
.article-card {
  background: var(--bg);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}
.article-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}
.article-card img {
  width: 100%;
  height: 180px;
  object-fit: cover;
}
.article-card-body {
  padding: var(--space-lg);
}
.article-card-body h3 {
  font-size: 1.1rem;
  margin-bottom: var(--space-sm);
}
.article-card-body p {
  font-size: 0.9rem;
  color: #666;
  line-height: 1.5;
}

/* === 相关梗推荐卡片 === */
.related-section {
  padding: var(--space-3xl) 0;
}
.related-carousel {
  display: flex;
  gap: var(--space-md);
  overflow-x: auto;
  padding-bottom: var(--space-md);
  scroll-snap-type: x mandatory;
}
.related-card {
  min-width: 200px;
  flex-shrink: 0;
  scroll-snap-align: start;
  background: var(--card-bg);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: transform var(--transition-normal);
  perspective: 1000px;
}
.related-card:hover {
  transform: scale(1.05);
}
.related-card img {
  width: 100%;
  height: 140px;
  object-fit: cover;
}
.related-card-body {
  padding: var(--space-sm) var(--space-md);
}
.related-card-body h4 {
  font-size: 0.9rem;
}
.related-card-body .heat-tag {
  display: inline-block;
  padding: 2px 8px;
  background: var(--primary);
  color: #fff;
  border-radius: 10px;
  font-size: 0.7rem;
  margin-top: 4px;
}

/* === 用户贡献编辑器 === */
.editor-section {
  padding: var(--space-3xl) 0;
}
.editor-container {
  max-width: 800px;
  margin: 0 auto;
  background: var(--bg);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.editor-toolbar {
  display: flex;
  gap: var(--space-sm);
  padding: var(--space-md);
  background: var(--card-bg);
  border-bottom: 1px solid var(--border-color);
  flex-wrap: wrap;
}
.editor-toolbar button {
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
}
.editor-toolbar button:hover {
  background: var(--secondary);
  color: #fff;
  border-color: var(--secondary);
}
.editor-area {
  min-height: 300px;
  padding: var(--space-lg);
  font-size: 1rem;
  line-height: 1.8;
  border: none;
  width: 100%;
  resize: vertical;
}
.editor-area:focus {
  outline: none;
}
.editor-container:focus-within {
  border-color: var(--secondary);
}
.editor-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md);
  border-top: 1px solid var(--border-color);
  background: var(--card-bg);
}
.editor-footer .compliance-tip {
  font-size: 0.8rem;
  color: #999;
}

/* === 页脚 === */
.site-footer {
  background: var(--text);
  color: #ccc;
  padding: var(--space-3xl) 0 var(--space-lg);
}
.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-xl);
  margin-bottom: var(--space-xl);
}
.footer-col h4 {
  color: #fff;
  font-size: 1rem;
  margin-bottom: var(--space-md);
}
.footer-col a {
  display: block;
  font-size: 0.85rem;
  padding: 4px 0;
  color: #aaa;
  transition: color var(--transition-fast);
}
.footer-col a:hover {
  color: var(--secondary);
}
.footer-bottom {
  border-top: 1px solid #333;
  padding-top: var(--space-lg);
  text-align: center;
  font-size: 0.8rem;
  color: #888;
}
.footer-bottom .disclaimer {
  margin-top: var(--space-sm);
  font-size: 0.75rem;
  color: #666;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

/* === 面包屑导航 === */
.breadcrumb {
  padding: var(--space-md) 0;
  font-size: 0.85rem;
  color: #999;
}
.breadcrumb a {
  color: var(--accent);
}
.breadcrumb span {
  margin: 0 var(--space-xs);
}

/* === 分页 === */
.pagination {
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-xl) 0;
}
.pagination a, .pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  font-size: 0.85rem;
  transition: all var(--transition-fast);
}
.pagination a:hover, .pagination .current {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* === 动画 === */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 2px var(--primary); }
  50% { box-shadow: 0 0 0 6px rgba(255,107,107,0.3); }
}
@keyframes slideIn {
  from { transform: translateX(-20px); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}
.animate-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* === 搜索面板 === */
.search-overlay {
  position: fixed;
  inset: 0;
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(20px);
  z-index: 9999;
  display: none;
  align-items: flex-start;
  justify-content: center;
  padding-top: 120px;
}
.search-overlay.active {
  display: flex;
}
.search-panel {
  width: 100%;
  max-width: 600px;
  padding: 0 var(--space-md);
}
.search-panel input {
  width: 100%;
  padding: 16px 24px;
  font-size: 1.25rem;
  border: 2px solid var(--border-color);
  border-radius: var(--radius-xl);
  background: var(--bg);
}
.search-panel input:focus {
  border-color: var(--primary);
}
.search-hot-list {
  margin-top: var(--space-lg);
}
.search-hot-list h4 {
  font-size: 0.9rem;
  color: #999;
  margin-bottom: var(--space-md);
}
.search-hot-list .hot-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
}
.search-hot-list .hot-tag {
  padding: 6px 14px;
  background: var(--card-bg);
  border-radius: 16px;
  font-size: 0.85rem;
  border: 1px solid var(--border-color);
  transition: all var(--transition-fast);
}
.search-hot-list .hot-tag:hover {
  background: var(--primary);
  color: #fff;
  border-color: var(--primary);
}

/* === 词条详情页 === */
.wiki-header {
  padding: var(--space-2xl) 0;
  border-bottom: 1px solid var(--border-color);
}
.wiki-title {
  font-size: 2rem;
  margin-bottom: var(--space-sm);
}
.wiki-pinyin {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.9rem;
}
.wiki-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: var(--space-xl);
  padding: var(--space-xl) 0;
}
.wiki-main {
  min-width: 0;
}
.wiki-sidebar {
  position: sticky;
  top: 80px;
  align-self: start;
}
.wiki-info-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
}
.wiki-info-card h4 {
  font-size: 1rem;
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-sm);
  border-bottom: 2px solid var(--primary);
}
.wiki-info-card dl {
  font-size: 0.85rem;
}
.wiki-info-card dt {
  font-weight: 600;
  color: #666;
  margin-top: var(--space-sm);
}
.wiki-info-card dd {
  margin-top: 2px;
}

/* === 响应式设计 === */
@media (max-width: 1024px) {
  .wiki-layout {
    grid-template-columns: 1fr;
  }
  .wiki-sidebar {
    position: static;
  }
}
@media (max-width: 768px) {
  .header-search {
    display: none;
  }
  .main-nav {
    display: none;
  }
  .hero-content h1 {
    font-size: 1.75rem;
  }
  .hero-content p {
    font-size: 1rem;
  }
  .meme-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-sm);
  }
  .article-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .section-title {
    font-size: 1.4rem;
  }
  /* 移动端底部操作栏 */
  .mobile-bar {
    display: flex;
  }
}
@media (max-width: 480px) {
  .meme-grid {
    grid-template-columns: 1fr;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

/* 移动端底部悬浮栏 */
.mobile-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg);
  border-top: 1px solid var(--border-color);
  padding: var(--space-sm) 0;
  z-index: 999;
  justify-content: space-around;
  align-items: center;
}
.mobile-bar a {
  display: flex;
  flex-direction: column;
  align-items: center;
  font-size: 0.7rem;
  color: #666;
  gap: 2px;
}
.mobile-bar a .icon {
  font-size: 1.2rem;
}
.mobile-bar a.active {
  color: var(--primary);
}

/* === 骨架屏 === */
.skeleton {
  background: linear-gradient(90deg, var(--card-bg) 25%, #e8e8e8 50%, var(--card-bg) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

/* === 加载提示 === */
.loading-tip {
  text-align: center;
  padding: var(--space-xl);
  color: #999;
  font-size: 0.9rem;
}

/* === 词条分类网格 === */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: var(--space-md);
}
.category-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  text-align: center;
  transition: all var(--transition-normal);
  border: 2px solid transparent;
}
.category-card:hover {
  border-color: var(--secondary);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.category-card .icon {
  font-size: 2rem;
  margin-bottom: var(--space-sm);
}
.category-card h3 {
  font-size: 0.95rem;
  margin-bottom: var(--space-xs);
}
.category-card .count {
  font-size: 0.8rem;
  color: #999;
}