@font-face {
    font-family: Homer;
    src: url(./fonts/Homer_Simpson_Revised.ttf);
    font-weight: 400;
    font-style: normal;
}

:root {
    --main-text-color: #294a4a;
    --bg-color: #9f45ff;
    --selection-color: #f8d62a;
}

body {
    margin: 0;
    padding: 1px;
    box-sizing: border-box;
    background: url(./img/bg.jpg) center/cover no-repeat;
    height: 100vh;
    font-family: Homer, sans-serif;
    font-size: 1.3vw;
    color: var(--main-text-color);
}

.title {
    margin: .2em auto;
    font-size: 4em;
    text-align: center;
}

.title::selection {
    background-color: var(--selection-color);
}

.main {
    width: 60%;
    height: 80%;
    margin: 0 1em;
    border: .2em solid var(--main-text-color);
    border-radius: 1em;
    display: grid;
    grid-template: repeat(4, 1fr) / repeat(4, 1fr);
    gap: .2px;
    perspective: 40em;
    position: relative;
    user-select: none;
}

.finish {
    position: absolute;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
}

.hidden {
    display: none;
}

.finish-title {
    font-size: 4em;
    margin: .5em;
}

.finish-text {
    font-size: 2em;
    margin: 0;
}

.finish-button {
    font-size: 1.5em;
    margin-top: 1.5em;
    padding: .5em;
    border-radius: .5em;
    cursor: pointer;
    background-color: var(--selection-color);
}

.finish-button:hover {
    color: var(--bg-color);
}

.flipper.flipped  {
    transform: rotateY(180deg);
}

.flipper {
    margin: auto;
    width: 60%;
    height: 95%;
    transition: 0.6s;
	transform-style: preserve-3d;
	position: relative;
    cursor: pointer;
}

.front {
    width: 100%;
    height: 100%;
    box-sizing: border-box;
    border: .2em solid var(--main-text-color);
    border-radius: 1em; 
    overflow: hidden;
    z-index: 2;
	transform: rotateY(0deg);
}

.back {
    width: 100%;
    height: 100%;
    padding: 2%;
    box-sizing: border-box;
    border: .2em solid var(--main-text-color);
    border-radius: 1em; 
    overflow: hidden;
    transform: rotateY(180deg);
    background-color: white;
}

.front, .back {
	backface-visibility: hidden;
	position: absolute;
	top: 0;
	left: 0;
}

.front-img, .back-img {
    width: 100%;
    height: 100%;
    object-position: center;
    object-fit: cover;
}

.back-img {
    object-fit: contain;
}

@media (orientation: portrait) {
    body {
        background: var(--bg-color);
        font-size: 3vw;
    }

    .main {
        width: auto;
    } 

    .flipper {
        width: 90%;
    }
}