:root {
  color-scheme: light;
  --blue: #0567b9;
  --deep: #083f70;
  --ink: #173349;
  --muted: #607486;
  --line: #dce7ef;
  --paper: #ffffff;
  --wash: #f3f8fc;
}

* { box-sizing: border-box; }
html { font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; line-height: 1.6; background: var(--wash); color: var(--ink); }
body { margin: 0; }
header { background: linear-gradient(145deg, var(--deep), var(--blue)); color: #fff; padding: 42px 22px 36px; }
header > div, main, footer > div { width: min(820px, 100%); margin: 0 auto; }
.brand { margin: 0 0 8px; font-weight: 800; letter-spacing: .02em; }
h1 { margin: 0; font-size: clamp(2rem, 6vw, 3.15rem); line-height: 1.08; }
.lede { margin: 14px 0 0; max-width: 680px; color: rgba(255,255,255,.86); }
main { margin: 28px auto; padding: 0 18px; }
article { background: var(--paper); border: 1px solid var(--line); border-radius: 18px; padding: clamp(22px, 5vw, 42px); box-shadow: 0 14px 38px rgba(8,63,112,.08); }
h2 { margin: 30px 0 8px; color: var(--deep); font-size: 1.25rem; }
h2:first-child { margin-top: 0; }
p, li { font-size: 1rem; }
ul { padding-left: 22px; }
a { color: var(--blue); }
.updated { color: var(--muted); font-size: .93rem; }
.note { background: #eef7ff; border-left: 4px solid var(--blue); border-radius: 8px; padding: 12px 14px; }
nav { margin-top: 24px; display: flex; flex-wrap: wrap; gap: 10px 18px; }
nav a { color: #fff; font-weight: 700; }
footer { padding: 4px 18px 36px; color: var(--muted); }

@media (max-width: 560px) {
  header { padding-top: 30px; }
  article { border-radius: 14px; }
}