:root {
  color-scheme: light dark;
  --brand: #007c87;
  --accent: #f59e0b;
  --surface: #ffffff;
  --surface-muted: #f3f7f7;
  --text: #172126;
  --muted: #526168;
  --border: #d5e0e2;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--surface-muted);
  color: var(--text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
}

header {
  background: linear-gradient(135deg, #006b75, var(--brand));
  color: white;
  padding: 2.5rem 1.25rem;
}

header div,
main {
  width: min(100%, 860px);
  margin: 0 auto;
}

main {
  background: var(--surface);
  padding: clamp(1.25rem, 4vw, 3rem);
}

h1,
h2 {
  line-height: 1.25;
}

h2 {
  margin-top: 2rem;
  color: var(--brand);
}

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

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

.notice {
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: 0.75rem;
  background: var(--surface-muted);
  padding: 1rem;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1rem;
  margin-top: 1rem;
}

nav a {
  color: white;
}

li + li {
  margin-top: 0.4rem;
}

footer {
  width: min(100%, 860px);
  margin: 0 auto;
  padding: 1.5rem;
  color: var(--muted);
}

@media (prefers-color-scheme: dark) {
  :root {
    --surface: #11191c;
    --surface-muted: #0b1214;
    --text: #e8f1f2;
    --muted: #afbec2;
    --border: #344449;
  }
}