:root {
    color-scheme: dark;
    --background: #111111;
    --surface: #191919;
    --text: #ffffff;
    --muted: #b8b8b8;
    --border: #353535;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    background: var(--background);
    color: var(--text);
    font-family: Arial, Helvetica, sans-serif;
    line-height: 1.65;
}

header,
main,
footer {
    width: min(100% - 40px, 820px);
    margin-inline: auto;
}

header {
    padding: 42px 0 24px;
}

.brand {
    color: var(--text);
    font-size: 22px;
    font-weight: 900;
    letter-spacing: 2px;
    text-decoration: none;
}

main {
    padding: 42px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 18px;
}

h1 {
    margin: 0 0 10px;
    font-size: clamp(32px, 6vw, 52px);
    line-height: 1.08;
}

h2 {
    margin: 34px 0 10px;
    font-size: 22px;
}

p,
li {
    color: var(--muted);
}

.updated {
    margin: 0 0 34px;
    font-size: 14px;
}

a {
    color: var(--text);
}

footer {
    padding: 28px 0 44px;
    color: var(--muted);
    font-size: 13px;
    text-align: center;
}

footer a {
    margin: 0 8px;
}

@media (max-width: 600px) {
    header,
    main,
    footer {
        width: min(100% - 24px, 820px);
    }

    header {
        padding-top: 26px;
    }

    main {
        padding: 28px 22px;
        border-radius: 14px;
    }
}