.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5); /* 반투명 검은색 */
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999; /* 메인 콘텐츠 위에 표시되도록 높은 z-index 설정 */
}

.loading-container {
    display: flex;
    justify-content: center;
    align-items: center;
}

/**
  * Waterfall
  *
  * @author jh3y
*/
@-webkit-keyframes waterfall {
    0% {
        opacity: 0;
        -webkit-transform: translateY(-250%);
        transform: translateY(-250%);
    }
    40%,
    60% {
        opacity: 1;
        -webkit-transform: translateY(0);
        transform: translateY(0);
    }
    100% {
        opacity: 0;
        -webkit-transform: translateY(250%);
        transform: translateY(250%);
    }
}

@keyframes waterfall {
    0% {
        opacity: 0;
        -webkit-transform: translateY(-250%);
        transform: translateY(-250%);
    }
    40%,
    60% {
        opacity: 1;
        -webkit-transform: translateY(0);
        transform: translateY(0);
    }
    100% {
        opacity: 0;
        -webkit-transform: translateY(250%);
        transform: translateY(250%);
    }
}

.waterfall div {
    -webkit-animation: waterfall 1.5s infinite;
    animation: waterfall 1.5s infinite;
    background-color: #5ac0fa;
    height: 20px;
    left: 50%;
    margin-top: -10px;
    opacity: 0;
    position: absolute;
    top: 50%;
    width: 20px;
}

.waterfall div:nth-of-type(1) {
    -webkit-animation-delay: 0.25s;
    animation-delay: 0.25s;
    margin-left: -10px;
}

.waterfall div:nth-of-type(2) {
    -webkit-animation-delay: 0.5s;
    animation-delay: 0.5s;
    margin-left: 15px;
}

.waterfall div:nth-of-type(3) {
    -webkit-animation-delay: 0.75s;
    animation-delay: 0.75s;
    margin-left: -35px;
}

.waterfall div:nth-of-type(4) {
    -webkit-animation-delay: 1s;
    animation-delay: 1s;
    margin-left: 40px;
}

.waterfall div:nth-of-type(5) {
    -webkit-animation-delay: 1.25s;
    animation-delay: 1.25s;
    margin-left: -60px;
}