.gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); /* ← 每張最多 180px */
    gap: 20px;
    justify-content: center;
}

.gallery img {
    width: 100%;
    max-width: 180px;   /* ← 真正控制圖片大小：寬度限制 */
    height: 240px;      /* ← 搭配固定高 */
    object-fit: cover;  /* 保持裁切但不變形 */
    border-radius: 12px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.15);
}