/* ===== 全局 ===== */
body {
  margin: 0;
  font-family: Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: #f5f7fa;
  color: #333;
}

/* ===== 导航 ===== */
.nav {
  background: #ffffff;
  padding: 15px;
  text-align: center;
  border-bottom: 1px solid #eee;
}

.nav a {
  margin: 0 15px;
  text-decoration: none;
  color: #0066cc;
}

/* ===== 头部 ===== */
.header {
  text-align: center;
  padding: 30px 15px;
}

/* ===== 主体布局 ===== */
.layout {
  display: flex;
  max-width: 1400px;
  margin: auto;
}

/* ===== 内容区 ===== */
.content {
  flex: 1;
  padding: 20px;
}

article {
  background: #ffffff;
  padding: 20px;
  margin-bottom: 20px;
  border-radius: 6px;
}

article h2 a {
  text-decoration: none;
  color: #333;
}

.meta {
  font-size: 14px;
  color: #888;
}

.read-more {
  display: inline-block;
  margin-top: 10px;
  color: #0066cc;
}

/* ===== 广告通用 ===== */
.ad-box {
  background: #eef1f6;
  border: 1px dashed #aaa;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #666;
  font-size: 13px;
  margin-bottom: 20px;
}

/* ===== 广告尺寸 ===== */
.ad-728 {
  height: 90px;
}

.ad-160 {
  width: 160px;
  height: 600px;
}

.ad-300 {
  width: 300px;
  height: 250px;
}

/* ===== 顶部广告 ===== */
.top-ads {
  max-width: 1400px;
  margin: 20px auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 15px;
  padding: 0 15px;
}

/* ===== 侧边广告 ===== */
.side-ads {
  width: 180px;
  padding: 20px 10px;
}

.side-ads.left {
  border-right: 1px solid #eee;
}

.side-ads.right {
  border-left: 1px solid #eee;
}

/* ===== 底部广告 ===== */
.bottom-ads {
  max-width: 1000px;
  margin: 40px auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  justify-items: center;
}

/* ===== 页脚 ===== */
.footer {
  text-align: center;
  padding: 30px;
  font-size: 14px;
  color: #888;
}

/* ===== 移动端适配 ===== */
@media (max-width: 1200px) {
  .side-ads {
    display: none;
  }
}