* {
        margin: 0;
        padding: 0;
        box-sizing: border-box;
    }

    .media-grid {
        display: grid;
        grid-template-columns: repeat(4, 1fr);
        gap: 30px;
        max-width: 1300px;
        margin: 0 auto;
        padding: 50px 30px;
    }

    .media-grid__item {
        border-radius: 14px;
        overflow: hidden;
        position: relative;
        background-color: #000;
        transition: all 0.4s ease;
        box-shadow: 0 8px 18px rgba(0, 0, 0, 0.10);
        border: 1px solid #e8e8e8;
    }

    .media-grid__item:hover {
        transform: translateY(-6px);
        box-shadow: 0 20px 36px rgba(0,0,0,0.18);
    }

    /* ====== 3:4 统一比例（视频 + 第三张图 + 第四张图） ====== */
    .ratio-3-4 {
        aspect-ratio: 3/4;
    }

    .content-over-media__media {
        width: 100%;
        height: 100%;
        object-fit: cover;
        transition: transform 0.6s ease;
    }

    .media-grid__item:hover .content-over-media__media {
        transform: scale(1.08);
    }

    video {
        width: 100%;
        height: 100%;
        object-fit: cover;
        background-color: #000;
    }

    /* 白色文字，无背景 */
    .media-text {
        position: absolute;
        bottom: 22px;
        width: 100%;
        text-align: center;
        font-size: 1.8rem;
        font-weight: 700;
        color: #fff;
        text-shadow: 0 3px 8px rgba(0,0,0,0.6);
        letter-spacing: 1px;
        z-index: 3;
    }


    /* ====== 布局尺寸 ====== */
    .media-grid__item:nth-child(1) {
        grid-column: span 2;
        grid-row: span 2;
    }

    .media-grid__item:nth-child(2) {
        grid-column: span 2;
        grid-row: span 1;
    }

    .media-grid__item:nth-child(3),
    .media-grid__item:nth-child(4) {
        grid-column: span 2;
        grid-row: span 2;
    }

    /* ====== 响应式 ====== */
    @media (max-width: 1200px) {
        .media-grid {
            grid-template-columns: repeat(2, 1fr);
        }
        .media-grid__item {
            grid-column: span 1 !important;
            grid-row: span 1 !important;
        }
    }

    @media (max-width: 800px) {
        .media-grid {
            grid-template-columns: 1fr;
        }
        .media-grid__item {
            grid-column: 1 !important;
            grid-row: span 1 !important;
        }
        .media-text {
            font-size: 1.4rem;
        }
    }