.image-grid-flex {
        display: grid;
        grid-template-columns: repeat(3, 1fr); /* 4열 */
        padding: 10px 0;
    }

    .image-item {
        cursor: pointer;
        border-radius: 4px;
        overflow: hidden;
        border: 1px solid #ddd;
        transition: all 0.2s;
        aspect-ratio: 1 / 1; /* 정사각형 비율 */
        position: relative; /* 삭제 버튼 위치를 위해 추가 */
    }

    .image-item img {
        width: 100%;
        height: 100%;
        object-fit: cover; /* 이미지를 정사각형에 꽉 차게 */
        display: block;
        transition: all 0.2s;
    }

    .image-item:hover {
        border-color: #337ab7;
        box-shadow: 0 2px 8px rgba(0,0,0,0.15);
        transform: scale(1.05);
    }

    .image-item.active {
        outline: 3px solid red;
        outline-offset: -3px;
    }

    /* 삭제 버튼 스타일 */
    .image-delete-btn {
        position: absolute;
        top: 4px;
        right: 4px;
        width: 28px;
        height: 28px;
        background-color: rgba(255, 255, 255, 0.9);
        border: 1px solid #ddd;
        border-radius: 4px;
        display: flex;
        align-items: center;
        justify-content: center;
        cursor: pointer;
        opacity: 0;
        transition: all 0.2s;
        padding: 0;
    }

    .image-delete-btn svg {
        color: #dc3545;
    }

    .image-item:hover .image-delete-btn {
        opacity: 1;
    }

    .image-delete-btn:hover {
        background-color: #dc3545;
        border-color: #dc3545;
    }

    .image-delete-btn:hover svg {
        color: white;
    }