/* 基础样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  color: #333;
  background: #f5f5f5;
}

a {
  text-decoration: none;
  color: #0066cc;
  transition: color 0.3s;
}

a:hover {
  color: #004499;
}

/* 头部导航 */
header {
  background: #ffffff;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  position: sticky;
  top: 0;
  z-index: 100;
}

nav {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: nowrap;
}

.logo {
  font-size: 24px;
  font-weight: bold;
  color: #0066cc;
  padding: 15px 0;
  white-space: nowrap;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 10px;
  flex-wrap: nowrap;
  flex: 1;
  justify-content: flex-end;
  align-items: center;
}

.nav-links li {
  flex: 0 0 auto;
  min-width: 0;
}

.nav-links a {
  display: block;
  padding: 15px 12px;
  color: #333;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav-links a:hover {
  color: #0066cc;
  background: #f0f7ff;
}

/* 移动端导航 */
@media (max-width: 768px) {
  nav {
    padding: 0 10px;
  }

  .logo {
    font-size: 18px;
    padding: 10px 0;
  }

  .nav-links {
    gap: 2px;
  }

  .nav-links a {
    padding: 10px 6px;
    font-size: 13px;
  }
}

@media (max-width: 480px) {
  .logo {
    font-size: 16px;
  }

  .nav-links a {
    padding: 10px 4px;
    font-size: 12px;
  }
}

/* 主容器 */
main {
  max-width: 1200px;
  margin: 20px auto;
  padding: 0 20px;
}

/* 页面标题 */
h1 {
  font-size: 32px;
  color: #1a1a1a;
  margin-bottom: 20px;
  padding-bottom: 15px;
  border-bottom: 3px solid #0066cc;
}

h2 {
  font-size: 24px;
  color: #2a2a2a;
  margin: 30px 0 15px;
}

h3 {
  font-size: 20px;
  color: #333;
  margin: 20px 0 10px;
}

/* 站点介绍 */
.site-intro {
  background: #ffffff;
  padding: 30px;
  border-radius: 8px;
  margin-bottom: 30px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
  line-height: 1.8;
}

/* 卡片网格 */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  margin: 20px 0;
}

.video-card {
  background: #ffffff;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  transition: transform 0.3s, box-shadow 0.3s;
}

.video-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
}

.video-card-content {
  padding: 20px;
}

.video-title {
  font-size: 18px;
  font-weight: 600;
  color: #1a1a1a;
  margin-bottom: 10px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-meta {
  display: flex;
  gap: 15px;
  font-size: 14px;
  color: #666;
  margin-bottom: 10px;
}

.video-desc {
  font-size: 14px;
  color: #555;
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.video-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.tag {
  display: inline-block;
  padding: 4px 12px;
  background: #e8f4ff;
  color: #0066cc;
  border-radius: 15px;
  font-size: 12px;
}

/* 详情页 */
.detail-container {
  background: #ffffff;
  padding: 40px;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
  margin-bottom: 30px;
}

.detail-meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 15px;
  margin: 20px 0;
  padding: 20px;
  background: #f8f9fa;
  border-radius: 6px;
}

.meta-item {
  font-size: 15px;
}

.meta-label {
  font-weight: 600;
  color: #555;
}

.detail-section {
  margin: 30px 0;
}

.detail-section h2 {
  color: #0066cc;
  border-left: 4px solid #0066cc;
  padding-left: 12px;
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 20px;
  margin-top: 20px;
}

/* 列表页 */
.list-header {
  background: #ffffff;
  padding: 30px;
  border-radius: 8px;
  margin-bottom: 20px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.list-intro {
  font-size: 16px;
  color: #555;
  line-height: 1.8;
  margin-top: 15px;
}

/* 响应式 */
@media (max-width: 768px) {
  main {
    padding: 0 15px;
  }

  h1 {
    font-size: 24px;
  }

  .detail-container,
  .site-intro {
    padding: 20px;
  }

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

/* 页脚 */
footer {
  background: #2a2a2a;
  color: #999;
  text-align: center;
  padding: 30px 20px;
  margin-top: 50px;
}

footer p {
  margin: 5px 0;
}