/* =====================================================
   上传组件基础样式
   ===================================================== */
#bp-aiu-uploader {
    margin: 10px 0;
    padding: 10px;
    border: 1px dashed #ccc;
    border-radius: 6px;
    background: #fafafa;
}
#bp-aiu-file-input { 
    display: none; 
}
#bp-aiu-upload-btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 6px 14px;
    background: #0073aa;
    color: #fff;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 13px;
    transition: background .2s, opacity .2s;
}
#bp-aiu-upload-btn:hover:not(:disabled) { 
    background: #005a87; 
}
#bp-aiu-upload-btn:disabled,
#bp-aiu-upload-btn.is-disabled {
    background: #bfbfbf;
    cursor: not-allowed;
    opacity: .75;
}
.bp-aiu-hint {
    opacity: .8;
    font-size: 12px;
}
#bp-aiu-preview {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 10px;
}
#bp-aiu-preview:empty {
    margin-top: 0;
}
.bp-aiu-preview-item {
    position: relative;
    width: 80px;
    height: 80px;
    border-radius: 4px;
    overflow: hidden;
    border: 1px solid #ddd;
    background: #fff;
}
.bp-aiu-preview-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}
.bp-aiu-remove {
    position: absolute;
    top: 2px;
    right: 2px;
    width: 20px;
    height: 20px;
    line-height: 18px;
    text-align: center;
    background: rgba(0,0,0,0.6);
    color: #fff;
    border-radius: 50%;
    cursor: pointer;
    font-size: 14px;
    user-select: none;
}
.bp-aiu-remove:hover {
    background: rgba(0,0,0,0.85);
}
#bp-aiu-upload-status {
    font-size: 12px;
    color: #666;
    margin-top: 6px;
    min-height: 16px;
}

/* =====================================================
   活动流图片网格（微信朋友圈风格）
   ===================================================== */
.bp-aiu-activity-images {
    display: grid;
    gap: 4px;
    margin-top: 10px;
    max-width: 480px;
}
.bp-aiu-activity-images .bp-aiu-lightbox-item {
    display: block;
    position: relative;
    overflow: hidden;
    border-radius: 4px;
    background: #f0f0f0;
    cursor: zoom-in;
    text-decoration: none;
}
.bp-aiu-activity-images .bp-aiu-lightbox-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform .2s;
}
.bp-aiu-activity-images .bp-aiu-lightbox-item:hover img {
    transform: scale(1.03);
}

/* 1 张：保留原比例，最长边不超过 180px（不再放大） */
.bp-aiu-grid-1 {
    grid-template-columns: auto;
    max-width: 100%;
    justify-content: start;
}
.bp-aiu-grid-1 .bp-aiu-lightbox-item {
    display: inline-block;
    max-width: 180px;
    max-height: 180px;
    width: auto;
    height: auto;
    border-radius: 6px;
}
.bp-aiu-grid-1 .bp-aiu-lightbox-item img {
    display: block;
    max-width: 180px;
    max-height: 180px;
    width: auto;
    height: auto;
    object-fit: contain;
    border-radius: 6px;
}

/* 2 张：2 列 */
.bp-aiu-grid-2 {
    grid-template-columns: repeat(2, 1fr);
    max-width: 320px;
}
.bp-aiu-grid-2 .bp-aiu-lightbox-item {
    aspect-ratio: 1 / 1;
}

/* 3 张：3 列 */
.bp-aiu-grid-3 {
    grid-template-columns: repeat(3, 1fr);
    max-width: 480px;
}
.bp-aiu-grid-3 .bp-aiu-lightbox-item {
    aspect-ratio: 1 / 1;
}

/* 4 张：2x2 */
.bp-aiu-grid-4 {
    grid-template-columns: repeat(2, 1fr);
    max-width: 320px;
}
.bp-aiu-grid-4 .bp-aiu-lightbox-item {
    aspect-ratio: 1 / 1;
}

/* =====================================================
   灯箱
   ===================================================== */
.bp-aiu-lightbox {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.92);
    z-index: 999999;
    display: none;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity .2s ease;
}
.bp-aiu-lightbox.is-open {
    display: flex;
    opacity: 1;
}
.bp-aiu-lb-content {
    position: relative;
    max-width: 92vw;
    max-height: 88vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}
.bp-aiu-lb-content img {
    max-width: 92vw;
    max-height: 82vh;
    object-fit: contain;
    border-radius: 4px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.5);
    user-select: none;
}
.bp-aiu-lb-counter {
    color: rgba(255,255,255,0.75);
    font-size: 13px;
    margin-top: 10px;
    user-select: none;
}
.bp-aiu-lb-close,
.bp-aiu-lb-prev,
.bp-aiu-lb-next {
    position: absolute;
    background: rgba(255,255,255,0.12);
    color: #fff;
    border: none;
    cursor: pointer;
    border-radius: 50%;
    width: 44px;
    height: 44px;
    font-size: 22px;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background .2s;
    z-index: 10;
}
.bp-aiu-lb-close:hover,
.bp-aiu-lb-prev:hover,
.bp-aiu-lb-next:hover {
    background: rgba(255,255,255,0.25);
}
.bp-aiu-lb-close {
    top: 20px;
    right: 20px;
    font-size: 26px;
}
.bp-aiu-lb-prev {
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
}
.bp-aiu-lb-next {
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
}

body.bp-aiu-lb-active {
    overflow: hidden;
}

/* 移动端适配 */
@media (max-width: 600px) {
    .bp-aiu-lb-prev { left: 8px; }
    .bp-aiu-lb-next { right: 8px; }
    .bp-aiu-lb-close { top: 10px; right: 10px; }
    .bp-aiu-lb-close,
    .bp-aiu-lb-prev,
    .bp-aiu-lb-next {
        width: 38px;
        height: 38px;
        font-size: 18px;
    }
    .bp-aiu-grid-3 { max-width: 100%; }
    .bp-aiu-grid-2,
    .bp-aiu-grid-4 { max-width: 100%; }
}