/* ===== 全屏图片预览 ===== */
.img-preview-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.96);
    z-index: 200;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    animation: overlayIn 0.2s var(--ease);
}
.preview-close {
    position: absolute;
    top: 18px;
    right: 18px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255,255,255,0.12);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1em;
    cursor: pointer;
    z-index: 10;
    transition: background 0.2s;
}
.preview-close:active { background: rgba(255,255,255,0.25); }
.preview-counter {
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255,255,255,0.6);
    font-size: 0.86em;
    z-index: 10;
    font-weight: 500;
}
.preview-scroll {
    display: flex;
    width: 100%;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
}
.preview-scroll::-webkit-scrollbar { display: none; }
.preview-slide {
    flex: 0 0 100vw;
    scroll-snap-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 60vh;
    padding: 24px;
}
.preview-slide img {
    max-width: 100%;
    max-height: 80vh;
    object-fit: contain;
    border-radius: 6px;
    cursor: zoom-in;
    transition: transform 0.25s var(--ease);
}