* {
    box-sizing: border-box;
}

:root {
    --fade-duration: 0.3s;
    --rotate-duration: 0.8s;
}

body {
    margin: 0;
    padding: 0;
    font-family: sans-serif;
    height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

#markdown-container {
    position: absolute;
    top: 0;
    left: 0;
    background-color: white;
    z-index: 1;
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 30px;
    height: 100%;
    visibility: hidden;
    opacity: 0;
    transition: visibility 0s var(--fade-duration), opacity var(--fade-duration) linear;
}

#markdown-container.visible {
    visibility: visible;
    opacity: 1;
    transition: visibility 0s, opacity var(--fade-duration) linear;
}

.markdown-input {
    width: 100%;
    flex-grow: 1;
    padding: 10px;
}

#card-container {
    display: flex;
    flex-grow: 1;
    width: 100%;
    flex-direction: column;
    gap: 10px;
    padding: 30px;
    perspective: 1000px;
}

.card-side {
    position: absolute;
    inset: 40px 40px 60px 40px;
    padding: 20px;
    border: 1px solid black;
    backface-visibility: hidden;
    transition: transform var(--rotate-duration) linear;
    transform-style: preserve-3d;
}

.card-side table tr, .card-side table th, .card-side table td {
    border: 1px solid black;
    padding: 5px;
}

.card-side table th {
    border-bottom: 2px solid black;
}

.card-side table {
    border-collapse: collapse;
}

#card-back {
    transform: rotateY(180deg);
}