/* 不阻止整頁捲動 */
body {
    margin: 0;
    overflow-x: hidden;
}

/* 鑽石雨區域（建議覆蓋全螢幕） */
#diamondArea {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100%;
    pointer-events: none; /* 不阻擋使用者操作畫面 */
    overflow: hidden;
    z-index: 9999;
}

/* 鑽石元素 */
.diamond {
    position: absolute;
    top: -15vw; /* 從螢幕上方外開始 */

    width: 30px;   /* RWD 自動縮放 */
    height: 30px;

    

    background-image: url("../images/diamond\ .png");
    background-size: contain;
    background-position: center;
    background-repeat: no-repeat;


    opacity: 1;
    animation-name: fall;
    animation-timing-function: linear;
}

/* 下落動畫 */
@keyframes fall {
    from {
        top: -20vw;
    }
    to {
        top: calc(97.3vh);
    }
}

/* 淡出 */
.fadeout {
    transition: opacity 600s ease;
    opacity: 0;
}