/* 轮播图 */
.banner {
  background: var(--panel);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}

.banner-placeholder {
  width: 100%;
  height: 220px;
  background: linear-gradient(90deg, var(--hover), var(--border));
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-light);
}