:root {
  --bg: #07111a;
  --surface: #0d1c28;
  --text: #edf5fa;
  --muted: #a9bccb;
  --accent: #57d9e8;
  --line: #1d3344;
  color-scheme: dark;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 1rem/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

header, main, footer {
  max-width: 44rem;
  margin: 0 auto;
  padding: 0 16px;
}

header { padding-top: 2rem; }

.brand {
  color: var(--accent);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: 0.02em;
  text-decoration: none;
}

h1 { font-size: 2rem; line-height: 1.2; margin: 1.5rem 0 0.5rem; }
h2 { font-size: 1.25rem; margin: 2rem 0 0.5rem; color: var(--accent); }

a { color: var(--accent); text-underline-offset: 0.2em; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.meta { color: var(--muted); }

.callout {
  background: var(--surface);
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  border-radius: 8px;
  padding: 1rem;
}

.skip {
  position: absolute;
  left: -999px;
}
.skip:focus { left: 16px; top: 8px; background: var(--surface); padding: 0.5rem; }

footer {
  margin-top: 3rem;
  padding-top: 1rem;
  padding-bottom: 2rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}

footer nav a { margin-right: 1rem; display: inline-block; padding: 0.25rem 0; }