* { margin: 0; padding: 0; box-sizing: border-box;}

body {
    --bigfontsize: 7vw;
    background: rgb(255, 255, 255);
}

#bg1 {
    width: 0%;
    background: rgb(255, 255, 255);
    height: 100%;
    position: fixed;
    top: 0;
    animation: openupbg1 500ms ease-out forwards;
}

#bg2{
    width: 0%;
    background: rgb(255, 255, 255) url("../../images/diplome_paysage1.png");
    background-size: cover;
    height: 80%;
    position: fixed;
    top: 10%;
    animation: openupbg2 500ms ease-out 300ms forwards;
}

@keyframes openupbg1 {
    0% { width: 0; }
    100% { width: 60%; }
}
@keyframes openupbg2 {
    0% { width: 0; }
    100% { width: 40%; }
}

#logo {
    position: fixed;
    top: calc(50% - var(--bigfontsize) / 2);
    left: 35%;
    font: bold var(--bigfontsize) sans-serif;

}
#line {
    top: 50%;
    border-top: 1px solid black;
    width: 100%;
    position: fixed;
}
section {
    opacity: 0;
    margin: 300px 20px 0 50%;
    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
    animation: sectionanim 0ms ease-out 800ms forwards;
}
@keyframes sectionanim {
    0% { opacity: 0; }
    100% { opacity: 1; }
}
.item {
    width: calc(50% - 20px);
    background: rgb(255, 255, 255);
    margin: 10px;
    position: relative;
    overflow: hidden;
}
.item:nth-child(2n){
    margin-top: 150px;
}
img {
    width: 100%;
    display: block;
}
.item div {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgb(255, 255, 255);
    padding: 1em;
    opacity: .5;
    transition: all 250ms;

}
.item:hover div {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    top: 0;
    opacity: 1;
}

#page h2 {
    font-size: var(--bigfontsize)
}