.portal-transition {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 9999;
    visibility: hidden;
    pointer-events: none;
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 10px;
    padding: 10px;
}

.portal-transition::before {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(10px);
    opacity: 0;
    transition: opacity 0.3s ease;
}

#content {
    transition: opacity 0s ease;
    position: relative;
    z-index: 1;
}

.portal-transition span {
    background: linear-gradient(45deg, #000, #1a1a1a);
    transform: scaleY(0);
    transition: transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
    /* Ralenti à 0.7s */
}

.portal-transition span:nth-child(odd) {
    transform-origin: top;
}

.portal-transition span:nth-child(even) {
    transform-origin: bottom;
}

.portal-transition.active {
    visibility: visible;
}

.portal-transition.active::before {
    opacity: 1;
}

.portal-transition.active span {
    transform: scaleY(1);
}

.portal-transition.active span:nth-child(1) {
    transition-delay: 0s;
}

.portal-transition.active span:nth-child(2) {
    transition-delay: 0.15s;
}

.portal-transition.active span:nth-child(3) {
    transition-delay: 0.3s;
}

.portal-transition.active span:nth-child(4) {
    transition-delay: 0.45s;
}

.portal-transition.active span:nth-child(5) {
    transition-delay: 0.6s;
}


body>*:not(.portal-transition) {
    transition: filter 0.5s ease;
}

.portal-transition.active~* {
    filter: blur(10px);
}

.portal-transition.reverse span {
    transform: scaleY(0);
    transition-delay: 0s !important;
}


.portal-transition.reverse span:nth-child(1) {
    transition-delay: 0.6s !important;
}

.portal-transition.reverse span:nth-child(2) {
    transition-delay: 0.45s !important;
}

.portal-transition.reverse span:nth-child(3) {
    transition-delay: 0.3s !important;
}

.portal-transition.reverse span:nth-child(4) {
    transition-delay: 0.15s !important;
}

.portal-transition.reverse span:nth-child(5) {
    transition-delay: 0s !important;
}