@keyframes fadeIn {
    0% {
        transform: scale(0);
        opacity: 0;
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

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

:root {
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 2rem;
}

body {
    background: #f6f6f6;
}

img {
    object-fit: cover;
    width: 15rem;
    height: 15rem;
}

header {
    padding: 1rem;
    max-width: 40rem;
}

ul {
    margin-left: 1rem;
}

.feed {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.2rem;
    margin: 0.5rem;
}

.feed.left {
    justify-content: flex-start;
}

.feed.gap-xl {
    gap: 1rem;
}

details > :not(summary) {
    padding-left: 1rem;
}

@media (max-width: 700px) {
    .feed {
        gap: 0.5rem;
        margin: 0.25rem;
    }

    .block {
        width: 100%;
    }

    img {
        width: 100%;
        height: auto;
        aspect-ratio: 1/1;
    }
}

p.highlight {
    font-weight: bold;
}

.appear {
    transform-origin: 50% 50%;
    animation: fadeIn 0.1s ease-in-out;
    animation-fill-mode: forwards;
}

.main-nav {
    ul {
        display: flex;
        justify-content: flex-start;
        gap: 1rem;
        list-style: none;
        padding: 0;
        margin: 0;
    }
}

a,
a:visited {
    color: blue;
}

.mb-sm {
    margin-bottom: var(--space-sm);
}
.mt-sm {
    margin-top: var(--space-sm);
}
.ml-sm {
    margin-left: var(--space-sm);
}
.mr-sm {
    margin-right: var(--space-sm);
}

.mb-md {
    margin-bottom: var(--space-md);
}
.mt-md {
    margin-top: var(--space-md);
}
.ml-md {
    margin-left: var(--space-md);
}
.mr-md {
    margin-right: var(--space-md);
}
.mb-lg {
    margin-bottom: var(--space-lg);
}
.mt-lg {
    margin-top: var(--space-lg);
}
.ml-lg {
    margin-left: var(--space-lg);
}
.mr-lg {
    margin-right: var(--space-lg);
}