:root {
    --bg: #ffffff;
    --surface: #f6f7f9;
    --border: #e2e5ea;
    --text: #1a1d21;
    --muted: #5b6470;
    --accent: #1f5fa9;
    --maxw: 760px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
    margin: 0;
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    font-size: 17px;
    line-height: 1.65;
}

.wrap {
    max-width: var(--maxw);
    margin: 0 auto;
    padding: 0 24px;
}

header.site {
    border-bottom: 1px solid var(--border);
    background: var(--bg);
}

header.site .wrap {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding-top: 18px;
    padding-bottom: 18px;
}

.brand {
    font-weight: 700;
    font-size: 1.05rem;
    letter-spacing: -0.01em;
    color: var(--text);
    text-decoration: none;
}

.brand span {
    color: var(--muted);
    font-weight: 400;
}

nav a {
    color: var(--muted);
    text-decoration: none;
    margin-left: 20px;
    font-size: 0.95rem;
}

nav a:first-child { margin-left: 0; }

nav a:hover { color: var(--accent); text-decoration: underline; }

main { padding: 48px 0 64px; }

h1 {
    font-size: 2rem;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin: 0 0 8px;
}

h2 {
    font-size: 1.25rem;
    letter-spacing: -0.01em;
    margin: 40px 0 10px;
}

h3 {
    font-size: 1.02rem;
    margin: 26px 0 6px;
}

p { margin: 0 0 16px; }

ul { margin: 0 0 16px; padding-left: 22px; }

li { margin-bottom: 8px; }

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

.lede {
    font-size: 1.12rem;
    color: var(--muted);
    margin-bottom: 32px;
}

.updated {
    color: var(--muted);
    font-size: 0.92rem;
    margin-bottom: 32px;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 20px 24px;
    margin: 28px 0;
}

.card h2, .card h3 { margin-top: 0; }

.card p:last-child, .card ul:last-child { margin-bottom: 0; }

footer.site {
    border-top: 1px solid var(--border);
    padding: 28px 0 40px;
    color: var(--muted);
    font-size: 0.9rem;
}

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

footer.site .links a { margin-right: 18px; }

footer.site .copy { margin-top: 10px; }

@media (max-width: 560px) {
    body { font-size: 16px; }
    h1 { font-size: 1.6rem; }
    nav a { margin-left: 14px; }
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #14171a;
        --surface: #1c2024;
        --border: #2c3238;
        --text: #e8eaed;
        --muted: #9aa4b0;
        --accent: #7fb2ec;
    }
}