* {
    margin: 0;
    padding: 0;
}

.page {
    width: 100%;
    height: 100vh;
    position: relative;
}

#page_bg {
    width: 100%;
    height: auto;
    position: relative;
    z-index: 1;
}

#page_bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.page_content {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 2;
    width: 100%;
    height: 100%;
    pointer-events: none;
    /* 让点击穿透到背景，但按钮需要 pointer-events: auto */
}

/* 按钮基础样式 */
.download-btn {
    display: block;
    background-color:transparent;
    color: white;
    border: none;
    border-radius: 5px;
    font-size: 18px;
    cursor: pointer;
    position: absolute;
    pointer-events: auto;
    /* 恢复点击 */
    transition: all 0.3s;
}

.download-btn:hover {
    /* background-color: #f44336; */
}

/* 手机端样式 */
body.mobile .download-btn {
    width: 80%;
    height: 50px;
    left: 50%;
    transform: translateX(-50%);
    bottom: 10%;
    /* 距离底部 10% */
    font-size: 20px;
    border-radius: 25px;
}

/* 电脑端样式 */
body.pc .download-btn {
    width: 200px;
    height: 60px;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    /* 居中 */
    font-size: 24px;
    border-radius: 8px;
}