/* 基础样式 */
body {
    background-color: #1a1a1a;
    color: #fff;
    margin: 0;
    font-family: sans-serif;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    /* 调整标题间距：上4rem, 左右0, 下2rem */
    margin: 4rem 0 2rem;
}

/* 电脑端：2行5列 */
.gallery-container {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 12px;
    width: 95%;
    margin: 0 auto 5rem;
}

.img-card {
    width: 100%;
    height: 40vh; /* 电脑端高度 */
    background: #333;
    overflow: hidden;
    cursor: pointer;
    border-radius: 4px;
    transition: transform 0.3s ease;
}

.img-card:hover {
    transform: scale(1.02);
}

.gallery-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    transition: opacity 0.5s ease;
}

/* 手机端适配：5行2列 */
@media (max-width: 768px) {
    .gallery-container {
        grid-template-columns: repeat(2, 1fr);
    }
    .img-card {
        height: 25vh; /* 手机端高度 */
    }
    .section-title {
        font-size: 1.8rem;
        margin: 2.5rem 0 1.5rem;
    }
}

/* 全屏遮罩样式 */
.fullscreen-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(0,0,0,0.9);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.fullscreen-overlay img {
    max-width: 90%;
    max-height: 90%;
}