:root {
    --bg: #0a0a0a;
    --fg: #f5f5f5;
    --muted: #8a8a8a;
    --muted-strong: #b8b8b8;
    --rule: #1f1f1f;
    --accent: #f5f5f5;
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--fg);
    font-family:
        -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    font-size: 16px;
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
}

body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Top nav (subpages) */
header.site-nav {
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--rule);
}

header.site-nav .inner {
    max-width: 800px;
    margin: 0 auto;
}

header.site-nav a.brand {
    display: inline-block;
    font-size: 0.85rem;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--muted-strong);
    text-decoration: none;
}

header.site-nav a.brand:hover {
    color: var(--fg);
}

a {
    color: var(--fg);
    text-decoration: underline;
    text-decoration-color: var(--muted);
    text-underline-offset: 3px;
}

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

main {
    flex: 1;
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    padding: 4rem 2rem;
}

/* Home hero layout */
main.home {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding-top: 6rem;
    padding-bottom: 6rem;
}

.wordmark {
    font-size: 3rem;
    letter-spacing: 0.5em;
    text-transform: uppercase;
    color: var(--muted-strong);
    margin-bottom: 3.5rem;
}

.mission {
    font-weight: 400;
    letter-spacing: -0.01em;
    font-size: clamp(1.5rem, 6vw, 2.5rem);
    line-height: 1.15;
    margin: 0 0 2rem;
    max-width: 18ch;
}

.supporting {
    color: var(--muted-strong);
    font-size: 1rem;
    max-width: 42ch;
    margin: 0 0 1rem;
}

.supporting.dim {
    color: var(--muted);
}

.cta {
    margin-top: 3rem;
}

.btn {
    display: inline-block;
    padding: 0.85rem 1.5rem;
    border: 1px solid var(--fg);
    border-radius: 999px;
    color: var(--fg);
    text-decoration: none;
    font-size: 0.95rem;
    letter-spacing: 0.02em;
    transition:
        background-color 0.15s ease,
        color 0.15s ease;
}

.btn:hover {
    background: var(--fg);
    color: var(--bg);
}

/* Document pages (contact, privacy, terms) */
main.doc h1 {
    font-weight: 400;
    font-size: clamp(1.75rem, 4vw, 2.25rem);
    margin: 0 0 2rem;
    letter-spacing: -0.01em;
}

main.doc h2 {
    font-weight: 500;
    font-size: 1.15rem;
    margin: 2.5rem 0 0.75rem;
}

main.doc h3 {
    font-weight: 500;
    font-size: 1rem;
    margin: 1.75rem 0 0.5rem;
    color: var(--fg);
}

main.doc p,
main.doc li {
    margin: 0 0 1rem;
    color: var(--muted-strong);
}

main.doc ul {
    margin: 0 0 1rem;
    padding-left: 1.25rem;
}

main.doc li {
    margin: 0 0 0.5rem;
}

main.doc strong {
    color: var(--fg);
    font-weight: 600;
}

main.doc .lead {
    color: var(--fg);
    font-size: 1.05rem;
}

/* Footer */
footer {
    border-top: 1px solid var(--rule);
    padding: 2rem;
    color: var(--muted);
    font-size: 0.85rem;
}

footer .inner {
    max-width: 720px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem 1.5rem;
    align-items: baseline;
    justify-content: space-between;
}

footer .copy {
    color: var(--muted);
}

footer nav {
    display: flex;
    gap: 1.25rem;
}

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

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

@media (max-width: 480px) {
    main {
        padding: 3rem 1.25rem;
    }
    main.home {
        padding-top: 4rem;
        padding-bottom: 4rem;
    }
    footer .inner {
        flex-direction: column;
        align-items: flex-start;
    }
}