:root {
  --main-color: #004080;
  --accent-color: #007bff;
  --text-color: #222;
  --bg-color: #f9f9f9;
  --card-bg: #fff;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  background: var(--bg-color);
  color: var(--text-color);
}

header {
  background: var(--main-color);
  color: white;
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}

header h1 {
  margin: 0;
  font-size: 1.5rem;
  letter-spacing: 0.5px;
}

nav {
  display: flex;
  gap: 1rem;
}

nav a {
  color: white;
  text-decoration: none;
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: 4px;
}

nav a:hover, nav a.active {
  background: var(--accent-color);
}

main {
  max-width: 900px;
  margin: 2rem auto;
  background: var(--card-bg);
  padding: 2rem;
  border-radius: 8px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.05);
}

h2, h3 {
  color: var(--main-color);
  margin-top: 1.5rem;
}

p, li {
  line-height: 1.6;
}

ul {
  padding-left: 1.5rem;
}

footer {
  text-align: center;
  padding: 1rem;
  font-size: 0.9rem;
  color: #555;
  margin-top: 2rem;
}

footer a {
  color: var(--main-color);
  text-decoration: none;
}

.button {
  display: inline-block;
  background: var(--accent-color);
  color: white;
  padding: 0.8rem 1.5rem;
  border-radius: 6px;
  text-decoration: none;
  margin-top: 1rem;
  font-weight: 500;
}

.button:hover {
  background: #003f88;
}

.header-logo {
  height: 50px;
  max-width: 100%;
}