:root, *:before, *:after {
    box-sizing: border-box;
}

:root {
    color-scheme: light;
}

:root[data-theme="dark"] {
    color-scheme: dark;
}

:root {
    --primary: light-dark(#212f3d, #dedede);
    --secondary: light-dark(#364e66, #999999);
    --background: light-dark(oklch(0.93 0 89.876), #242424);
    --surface: light-dark(oklch(0.805 0 0), #383838);

    --link: light-dark(#155696, #9ae5ff);
    --link-visited: light-dark(#0f2a5f, #63a9ff);
    --link-active: light-dark(#FF0000, #FF0000);
}

:root {
    color: var(--primary);
    background-color: var(--background);

    font-family: "Atkinson Hyperlegible Next", sans-serif;
    line-height: 1.5;
    font-size: 1.1rem;

    block-size: 100%;
    padding: 0;
    margin: 0;
}

h2 {
    border-block-start: 1px solid var(--primary);
    padding-block-start: 2rem;
    margin-block-start: 2rem;
}

:not(h2) + h3 {
    margin-block-start: 2rem;
}
h3{
    margin-block-end: 0.25rem;

    + p {
        margin-block-start: 0;
    }
}

h4 {
    margin-block: 0.5rem;
}

ul {
    margin-block: 0.5rem;
}

body {
    padding: 0.5em;
    max-inline-size: 52ch;
    margin: auto;
}

#top-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 1em;
    font-size: larger;
    padding-block: 0.5em;
    border-block-end: 2px solid var(--primary);

    #home-link {
        display: flex;
        align-items: center;
        gap: 0.5em;
    }

    #theme-toggle {
        background: unset;
        border: unset;
        border-radius: 0.5em;

        &:hover {
            background: var(--surface);
        }
    }
}

#main {
    margin-block: 2em 5em;
}

footer {
    text-align: center;
    border-block-start: 2px solid var(--primary);
    padding-block: 1em;
}

h1:has(+ .social-sharing) {
    margin-block: 0;
}

.social-sharing {
    margin-block-end: 2em;
    display: flex;
    gap: 0.5rem;

    svg {
        color: var(--primary);
    }
}

#theme-toggle:hover {
    cursor: pointer;
}

.visually-hidden, #skip-link:not(:focus) {
    clip: rect(0 0 0 0);
    clip-path: inset(50%);
    height: 1px;
    overflow: hidden;
    position: absolute;
    white-space: nowrap;
    width: 1px;
}

#skip-link:focus {
    position: absolute;
    left: 0.5em;
    top: 0.5em;
    margin: 1em;
    padding: 1em;
    border: 0.25em solid var(--primary);
    font-size: larger;
    background-color: var(--background);
}

/* General Typography */
:root {
    blockquote p.attribution {
        margin-block: 0.25em;
        font-size: smaller;
        text-align: right;
    }

    :link {
        color: var(--link);
    }

    :visited {
        color: var(--link-visited);
    }

    :link:active, :visited:active {
        color: var(--link-active);
    }

    :is(h1, h2, h3, h4, h5, h6) {
        :link, :visited {
            color: inherit;
        }
    }

    dt {
        font-weight: bolder;
    }

    dd:not(dd dd) {
        border-inline-start: 2px solid oklch(from var(--primary) l c h / 30%);
        margin-inline-start: 0;
        padding-inline-start: 40px;
    }
}


@media (max-width: 50ch) {
    h1 {
        font-size: 1.5rem;
    }

    h2 {
        font-size: 1.25rem;
    }

    #top-nav {
        font-size: medium;
        gap: 1.5em;
    }
}

@media print {
    #theme-toggle {
        display: none;
    }

    article.blog-entry, img, figure, aside, section.footnotes li {
        break-inside: avoid;
    }

    h1, h2, h3, h4, h5, h6 {
        break-after: avoid;
    }
}