/* 主体内容 */
main {
    min-height: calc(100vh - 260px);
    max-width: 1920px;
    width: 100%;
    margin: 0 auto;
    overflow: visible;
    min-width: 1248px;
}

.banner {
    position: relative;
    min-width: 1248px;
    aspect-ratio: 1920 / 850;
    background: url("../assets/banner1@2x.webp") no-repeat center/cover;
    overflow: hidden;
}

.banner .download-btn {
    position: absolute;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    left: 50%;
    top: 80%;
    transform: translate(-50%, -50%);
    border-radius: 55px;
    /* width: 336px;
            height: 110px;
            font-size: 36px; */
    width: clamp(200px, 17.5vw, 336px);
    height: clamp(66px, 5.7vw, 110px);
    font-size: clamp(20px, 1.9vw, 36px);
    color: #000;
    background-color: #fff;
    font-weight: bold;

    transition:
        transform 0.35s cubic-bezier(.25, .8, .25, 1),
        box-shadow 0.35s cubic-bezier(.25, .8, .25, 1),
        background 0.35s ease;
    /* 硬件加速，减少模糊 */
    will-change: transform;
}

/* 悬停：整体放大 */
.banner .download-btn:hover {
    transform: translate(-50%, -50%) scale(1.08) translateZ(0);
}

.btn-icon {
    width: 37px;
    height: 37px;
    flex-shrink: 0;
}

.contain {
    display: flex;
    flex-direction: column;
}

.contain section {
    display: flex;
    justify-content: center;
}

.contain img {
    width: 100%;
    height: auto;
    aspect-ratio: 1920 / 800;
    display: block;

    opacity: 0;
    transform: translateY(80px);
    transition: .6s cubic-bezier(.25, .8, .25, 1);
}

section img.show {
    opacity: 1;
    transform: translateY(0);
}