:root {
    color-scheme: light;
    --navy: #0c1a2d;
    --blue: #0969da;
    --text: #172033;
    --muted: #667085;
    --line: #d8dee8;
    --surface: #fff;
    --background: #f3f5f8;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: var(--background);
    color: var(--text);
    font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    line-height: 1.65;
}

.topbar {
    background: var(--navy);
    color: #fff;
    padding: 14px max(20px, calc((100vw - 920px) / 2));
}
.brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: #fff;
    text-decoration: none;
    font-size: 1.16rem;
    font-weight: 750;
}
.brand__mark { width: 34px; height: 34px; }
.brand__shield { fill: #fff; }
.brand__letter { fill: var(--navy); }

.page-shell {
    width: 100%;
    max-width: 920px;
    margin: 0 auto;
    padding: 36px 20px;
    flex: 1;
}
.card {
    background: var(--surface);
    border: 1px solid #e4e8ef;
    border-radius: 18px;
    box-shadow: 0 10px 30px rgba(12, 26, 45, .08);
    padding: clamp(24px, 5vw, 48px);
}
.eyebrow {
    margin: 0 0 8px;
    color: var(--blue);
    font-size: .83rem;
    font-weight: 800;
    letter-spacing: .06em;
    text-transform: uppercase;
}
h1, h2 { color: var(--navy); line-height: 1.25; }
h1 { margin: 0 0 6px; font-size: clamp(1.75rem, 5vw, 2.5rem); }
h2 { margin: 34px 0 10px; font-size: 1.22rem; }
p { margin: 0 0 14px; }
li { margin: 6px 0; }
a { color: var(--blue); overflow-wrap: anywhere; }
.updated { margin: 0 0 20px; color: var(--muted); font-size: .92rem; }
.lead { color: #344054; font-size: 1.03rem; }
.summary {
    display: grid;
    gap: 7px;
    margin: 28px 0 6px;
    padding: 18px 20px;
    border: 1px solid #bfd3f3;
    border-radius: 12px;
    background: #f4f8ff;
}
.summary strong { color: var(--navy); margin-bottom: 2px; }
section { scroll-margin-top: 20px; }
footer {
    display: flex;
    justify-content: space-between;
    gap: 18px;
    width: 100%;
    max-width: 920px;
    margin: 0 auto;
    padding: 20px;
    color: var(--muted);
    font-size: .9rem;
}

@media (max-width: 620px) {
    .page-shell { padding: 20px 12px; }
    .card { border-radius: 13px; padding: 24px 19px; }
    footer { flex-direction: column; align-items: center; }
}