:root {
  color-scheme: light;
  --ink: #182234;
  --muted: #5d6878;
  --paper: #f6f8fb;
  --card: #ffffff;
  --line: #dbe2eb;
  --blue: #174ea6;
  --blue-dark: #103c80;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 1rem;
  line-height: 1.65;
}

a { color: var(--blue); }
a:hover { color: var(--blue-dark); }
a:focus-visible { outline: 3px solid #8ab4f8; outline-offset: 3px; border-radius: 3px; }

.shell {
  width: min(100% - 2rem, 760px);
  margin-inline: auto;
}

header {
  background: #102a56;
  color: white;
  border-bottom: 5px solid #4f8ddf;
}

.topbar {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  color: white;
  font-size: 1.15rem;
  font-weight: 750;
  letter-spacing: .01em;
  text-decoration: none;
}

nav { display: flex; gap: 1.1rem; }
nav a { color: #dceaff; font-size: .95rem; text-decoration: none; }
nav a[aria-current="page"] { color: white; text-decoration: underline; text-underline-offset: .3rem; }

main { padding: 3.5rem 0 4rem; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: 0 12px 36px rgba(25, 45, 75, .08);
  padding: clamp(1.5rem, 5vw, 3.25rem);
}

.eyebrow {
  color: var(--blue);
  font-size: .8rem;
  font-weight: 800;
  letter-spacing: .12em;
  margin: 0 0 .8rem;
  text-transform: uppercase;
}

h1, h2 { line-height: 1.18; letter-spacing: -.02em; }
h1 { font-size: clamp(2rem, 7vw, 3.15rem); margin: 0 0 1rem; }
h2 { font-size: 1.28rem; margin: 2.2rem 0 .6rem; }
p, ul { color: var(--muted); }
.lead { font-size: 1.16rem; max-width: 60ch; }
.note { border-left: 4px solid #4f8ddf; padding: .15rem 0 .15rem 1rem; }
li + li { margin-top: .55rem; }
.updated { font-size: .9rem; margin-top: 2.5rem; }

footer { padding: 0 0 2.5rem; }
footer p { font-size: .9rem; margin: 0; }

@media (max-width: 560px) {
  .topbar { align-items: flex-start; flex-direction: column; padding: 1rem 0; }
  nav { flex-wrap: wrap; gap: .6rem 1rem; }
  main { padding-top: 1.5rem; }
}