@font-face {
    font-family: "helveti";
    src: url("https://files.catbox.moe/pr3pcu.ttf");
}

:root {
    --bg: #000000;
    --fontcolor: rgb(136, 255, 0);
    --italic: rgb(255, 162, 0);
    --link: yellow;
    --linkhover: rgb(154, 37, 56);
    --border: rgb(104, 104, 104);
    --shadow: rgb(237, 237, 13, 0.7);
    --card-back-bg: rgba(0, 0, 0, 0.9);
}

body {
    background-color: var(--bg);
    background-image: linear-gradient(rgba(163, 163, 163, 0.5),
            rgba(0, 0, 0, 0.5)),
        url("https://www.transparenttextures.com/patterns/grid-me.png");
    font-family: "Source Serif", serif;
    color: var(--fontcolor);
}

h1,
h2,
h3,
h4,
h5,
h6 {
    text-align: center;
    font-family: "helveti", sans-serif;
}

p {
    font-family: "helveti", sans-serif;
    text-align: justify;
}

strong,
b {
    font-weight: 650;
}

em,
i {
    color: var(--italic);
}

a {
    color: var(--link);
    text-decoration: 1px solid underline;
    text-underline-offset: 2px;
}

a:hover {
    color: var(--linkhover);
}

#wrapper {
    padding: 1em;
    max-width: 750px;
    margin: 0 auto;
}

nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
}

nav a {
    font-family: monospace;
    display: inline-block;
    background: var(--link);
    color: rgb(0, 0, 0);
    text-decoration: none;
    padding: 5px 10px;
    border-radius: 10px;
    margin: 5px;
}

nav a:hover {
    background: var(--linkhover);
    color: var(--fontcolor);
}

header {
    background-color: rgb(0, 0, 0);
    margin: 1em 0;
    padding: 1em;
    border: 1px solid var(--border);
    border-radius: 10px;
    box-shadow: 2px 2px var(--shadow);
    break-inside: avoid-column;
    transition: 0.3s;
}

.flex {
    display: flex;
    flex-direction: row;
    column-gap: 3em;
    text-align: center;
    align-items: stretch;
    margin-bottom: 2em;
}

section.flip-card {
    position: relative;
    width: 100%;
    min-height: 250px;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 1em 0;
    perspective: 1000px;
    transition: transform 0.3s ease-in-out;
    box-sizing: border-box;
}

section.flip-card.left {
    transform: rotate(-1deg);
}

section.flip-card.right {
    transform: rotate(1.5deg);
}

section.flip-card:hover {
    transform: scale(1.1) rotate(0deg);
}

.flip-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    text-align: center;
    transition: transform 0.8s;
    transform-style: preserve-3d;
}

section.flip-card:hover .flip-card-inner {
    transform: rotateY(180deg);
}

.flip-card-front,
.flip-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 1em;
    box-sizing: border-box;
    border-radius: 10px;
    border: 1px solid var(--border);
    box-shadow: 2px 2px var(--shadow);
    overflow: hidden;
}

.flip-card-front {
    background-color: rgb(0, 0, 0);
    background-image: url("https://www.transparenttextures.com/patterns/gplay.png");
    color: var(--fontcolor);
}

.flip-card-back {
    background-color: var(--card-back-bg);
    color: var(--fontcolor);
    transform: rotateY(180deg);
    font-family: "Space Mono", monospace;
    padding: 2em;
}

.flip-card-back h3 {
    margin-top: 0;
    color: var(--link);
}

.flip-card-back p {
    font-size: 1em;
    line-height: 1.0;
}

.flip-card-front img {
    max-width: 100%;
    height: auto;
    display: block;
    margin: auto;
    object-fit: contain;
}

footer {
    font-family: monospace;
    padding: 1em 0;
    color: #ffffff;
    text-align: center;
}

footer div {
    background-color: rgb(49, 49, 49, 0.7);
}

@media only screen and (max-width: 800px) {

    .flex {
        flex-direction: column;
        column-gap: 0;
        align-items: center;
    }

    section.flip-card {
        transform: none !important;
        min-height: auto;
        padding: 1em;
        display: block;
    }

    .flip-card-inner {
        transform: none !important;
        position: static;
    }

    .flip-card-front,
    .flip-card-back {
        position: static;
        transform: none !important;
        width: 100%;
        height: auto;
        padding: 0;
    }

    .flip-card-back {
        padding: 1em;
    }

    .flip-card-front img {
        width: 100%;
        max-height: 200px;
        object-fit: contain;
    }
}