.background-video {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    object-fit: cover;
}
#background-title{
    height: 100vh;           /* 占满整个视口高度 */
    width: 100vw;           /* 占满整个视口宽度 */
    display: flex;           /* ③ 使用 flexbox 布局 */
    justify-content: center;       /* ④ 子元素垂直居中 */
    position: relative;
    text-align: center;/* 确保文字居中 */
    align-items: center;           /* ⑤ 子元素水平居中 */
    padding: 40px 0;
    z-index: 100;
}
#background-title h1{
    font-size: clamp(32px, 6vw, 70px);
    font-weight: 700;
    letter-spacing: -0.5px;
    color: mistyrose;
    text-align: center;
    font-family: 'Rage Italic', serif;
}
#background-title h2{
    font-size: clamp(16px, 4vw, 20px);
    line-height: 1.5;
    text-align: center;
}

@media(max-width:768px){
    .background-video {
        height:100%;
        object-fit: cover;
    }
}