/* ===== 推广广告组件 ===== */
.ad-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  overflow: hidden;
  transition: all 0.2s;
}
.ad-card:hover {
  border-color: #2563eb;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.08);
}

/* 广告标签 */
.ad-label {
  display: inline-block;
  font-size: 11px;
  color: var(--text-muted);
  background: var(--bg-subtle);
  padding: 2px 8px;
  border-radius: 4px;
  margin-bottom: 10px;
  font-weight: 500;
}

/* 1. 文章内嵌卡片（放段落之间） */
.ad-card-inline {
  display: flex;
  gap: 16px;
  padding: 16px;
  margin: 24px 0;
  align-items: center;
}
.ad-card-inline .ad-thumb {
  width: 150px;
  border-radius: 6px;
  object-fit: cover;
  flex-shrink: 0;
  background: var(--bg-subtle);
}
.ad-card-inline .ad-body {
  flex: 1;
  min-width: 0;
}
.ad-card-inline .ad-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 6px;
  line-height: 1.4;
}
.ad-card-inline .ad-desc {
  font-size: 13px;
  color: var(--text-secondary);
  margin: 0 0 10px;
  line-height: 1.6;
}
.ad-card-inline .ad-btn {
  display: inline-block;
  padding: 5px 14px;
  font-size: 13px;
  font-weight: 500;
  color: #fff;
  background: #2563eb;
  border-radius: 4px;
  text-decoration: none;
}
.ad-card-inline .ad-btn:hover {
  background: #1dd89a;
  text-decoration: none;
  color: #fff;
}

/* 2. 侧边栏推广卡片 */
.ad-card-sidebar {
  padding: 16px;
  margin-bottom: 20px;
}
.ad-card-sidebar .ad-thumb {
  width: 100%;
  height: 120px;
  border-radius: 6px;
  object-fit: cover;
  background: var(--bg-subtle);
  margin-bottom: 12px;
}
.ad-card-sidebar .ad-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 6px;
  line-height: 1.4;
}
.ad-card-sidebar .ad-desc {
  font-size: 12px;
  color: var(--text-secondary);
  margin: 0 0 10px;
  line-height: 1.6;
}
.ad-card-sidebar .ad-btn {
  display: block;
  width: 100%;
  text-align: center;
  padding: 8px 0;
  font-size: 13px;
  font-weight: 500;
  color: #fff;
  background: #2563eb;
  border-radius: 4px;
  text-decoration: none;
}
.ad-card-sidebar .ad-btn:hover {
  background: #1d4ed8;
  text-decoration: none;
}

/* 3. 文章底部横幅 */
.ad-banner-bottom {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 20px 24px;
  margin: 32px 0;
  background: linear-gradient(135deg, #f0f4ff 0%, #e0e7ff 100%);
  border: 1px solid #c7d2fe;
  border-radius: var(--radius);
}
.ad-banner-bottom .ad-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  flex-shrink: 0;
}
.ad-banner-bottom .ad-body {
  flex: 1;
}
.ad-banner-bottom .ad-title {
  font-size: 16px;
  font-weight: 600;
  color: #1e3a8a;
  margin: 0 0 4px;
}
.ad-banner-bottom .ad-desc {
  font-size: 13px;
  color: #4338ca;
  margin: 0;
}
.ad-banner-bottom .ad-btn {
  padding: 8px 18px;
  font-size: 13px;
  font-weight: 500;
  color: #fff;
  background: #2563eb;
  border-radius: 4px;
  text-decoration: none;
  white-space: nowrap;
  flex-shrink: 0;
}
.ad-banner-bottom .ad-btn:hover {
  background: #1d4ed8;
  text-decoration: none;
}

/* 响应式：移动端广告适配 */
@media (max-width: 600px) {
  .ad-card-inline {
    flex-direction: column;
    align-items: flex-start;
  }
  .ad-card-inline .ad-thumb {
    width: 100%;
    height: 140px;
  }
  .ad-banner-bottom {
    flex-direction: column;
    text-align: center;
    gap: 12px;
  }
  .ad-banner-bottom .ad-btn {
    width: 100%;
  }
}