:root {
    color-scheme: light dark;
    --background: #f5f5f7;
    --surface: rgba(255, 255, 255, 0.82);
    --text: #1d1d1f;
    --secondary: #5f6368;
    --accent: #3457d5;
    --border: rgba(29, 29, 31, 0.12);
}

@media (prefers-color-scheme: dark) {
    :root {
        --background: #101114;
        --surface: rgba(31, 32, 36, 0.86);
        --text: #f5f5f7;
        --secondary: #b4b5bb;
        --accent: #8aa4ff;
        --border: rgba(255, 255, 255, 0.14);
    }
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    background: var(--background);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", sans-serif;
    font-size: 17px;
    line-height: 1.6;
}

header,
main,
footer {
    width: min(760px, calc(100% - 40px));
    margin-inline: auto;
}

header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-block: 28px;
}

.brand {
    color: var(--text);
    font-weight: 700;
    text-decoration: none;
}

nav {
    display: flex;
    gap: 18px;
}

nav a,
footer a,
main a {
    color: var(--accent);
}

nav a {
    text-decoration: none;
}

main {
    min-height: calc(100vh - 190px);
}

.hero,
.document {
    padding: clamp(28px, 6vw, 56px);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 28px;
    box-shadow: 0 18px 55px rgba(0, 0, 0, 0.08);
}

h1,
h2 {
    line-height: 1.15;
}

h1 {
    margin-top: 0;
    font-size: clamp(2.4rem, 8vw, 4.6rem);
    letter-spacing: -0.045em;
}

.document h1 {
    font-size: clamp(2rem, 7vw, 3.2rem);
}

h2 {
    margin-top: 2.1em;
    font-size: 1.35rem;
}

.lede {
    color: var(--secondary);
    font-size: 1.2rem;
}

.button {
    display: inline-block;
    margin-top: 12px;
    padding: 11px 18px;
    border-radius: 999px;
    background: var(--accent);
    color: white;
    font-weight: 650;
    text-decoration: none;
}

.meta,
footer {
    color: var(--secondary);
    font-size: 0.9rem;
}

footer {
    padding-block: 28px;
}

@media (max-width: 560px) {
    header {
        align-items: flex-start;
        gap: 16px;
    }

    nav {
        flex-direction: column;
        gap: 4px;
        text-align: right;
    }
}