:root {
  --bg: #f5f6f8;
  --surface: #ffffff;
  --text: #1f2933;
  --muted: #5f6c7b;
  --line: #d7dde5;
  --accent: #1f4b7a;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Helvetica Neue", Helvetica, Arial, sans-serif;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
}

.container {
  width: min(100% - 2rem, 750px);
  margin-inline: auto;
}

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  padding: 2rem 0 1.25rem;
}

h1 {
  margin: 0;
  font-size: clamp(1.5rem, 2vw + 1rem, 2rem);
}

.subtitle {
  margin: 0.25rem 0 1rem;
  color: var(--muted);
  font-size: 0.98rem;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

nav a {
  text-decoration: none;
  color: var(--accent);
  border: 1px solid transparent;
  border-radius: 0.5rem;
  padding: 0.35rem 0.6rem;
}

nav a[aria-current="page"] {
  border-color: var(--line);
  background: #f1f5f9;
  color: #163c63;
}

main {
  padding: 1.75rem 0 2.25rem;
}

section + section {
  margin-top: 1.4rem;
}

h2 {
  margin: 0 0 0.5rem;
  font-size: 1.15rem;
}

p,
ul {
  margin: 0;
}

ul {
  padding-left: 1.15rem;
}

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

.meta {
  margin-top: 1.75rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--surface);
}

.site-footer .container {
  padding: 1rem 0;
}

.site-footer p {
  color: var(--muted);
  font-size: 0.9rem;
}

@media (max-width: 600px) {
  .site-header {
    padding-top: 1.5rem;
  }

  nav a {
    padding: 0.3rem 0.5rem;
  }
}