:root {
    --bg: #ffffff;
    --fg: #1d1d1f;
    --muted: #6e6e73;
    --line: #d2d2d7;
    --accent: #0071e3;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #000000;
        --fg: #f5f5f7;
        --muted: #86868b;
        --line: #2c2c2e;
        --accent: #2997ff;
    }
}

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

body {
    background: var(--bg);
    color: var(--fg);
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
    font-size: 17px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

header {
    border-bottom: 1px solid var(--line);
    position: sticky;
    top: 0;
    background: var(--bg);
}

nav {
    max-width: 800px;
    margin: 0 auto;
    padding: 18px 24px;
    display: flex;
    align-items: baseline;
    gap: 28px;
}

nav .brand {
    font-weight: 600;
    letter-spacing: -0.01em;
    margin-right: auto;
}

nav a {
    color: var(--muted);
    text-decoration: none;
    font-size: 15px;
}

nav a:hover,
nav a[aria-current="page"] {
    color: var(--fg);
}

main {
    max-width: 800px;
    margin: 0 auto;
    padding: 80px 24px 120px;
}

h1 {
    font-size: 44px;
    font-weight: 600;
    letter-spacing: -0.02em;
    line-height: 1.15;
    margin-bottom: 20px;
}

h2 {
    font-size: 24px;
    font-weight: 600;
    letter-spacing: -0.01em;
    margin: 52px 0 14px;
}

p {
    margin-bottom: 18px;
}

ul {
    margin: 0 0 18px 22px;
}

li {
    margin-bottom: 8px;
}

.lead {
    font-size: 21px;
    color: var(--muted);
    margin-bottom: 40px;
}

.meta {
    font-size: 15px;
    color: var(--muted);
    margin-bottom: 48px;
}

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

footer {
    border-top: 1px solid var(--line);
    font-size: 14px;
    color: var(--muted);
}

footer div {
    max-width: 800px;
    margin: 0 auto;
    padding: 28px 24px;
    display: flex;
    gap: 24px;
    flex-wrap: wrap;
}

footer a {
    color: var(--muted);
    text-decoration: none;
}

footer a:hover {
    color: var(--fg);
}

@media (max-width: 600px) {
    h1 {
        font-size: 34px;
    }

    main {
        padding: 56px 20px 80px;
    }

    .lead {
        font-size: 19px;
    }
}

footer .langs {
    border-top: 1px solid var(--line);
    padding-top: 20px;
    padding-bottom: 26px;
    gap: 18px;
}

footer .langs a[aria-current="page"] {
    color: var(--fg);
}