/* Base reset */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
               Roboto, Helvetica, Arial, sans-serif;
  line-height: 1.6;
  color: #222;
  background-color: #fafafa;
}

/* Layout */
header {
  background: #0b3c5d;
  color: white;
  padding: 1.5rem 1rem;
}

header h1 {
  margin-bottom: 0.5rem;
}

nav a {
  color: #e6f2ff;
  margin-right: 1.2rem;
  text-decoration: none;
  font-weight: 500;
}

nav a:hover {
  text-decoration: underline;
}

main {
  max-width: 900px;
  margin: 2.5rem auto;
  padding: 0 1rem;
}

section {
  margin-bottom: 2.5rem;
}

h2 {
  color: #0b3c5d;
  margin-bottom: 0.8rem;
}

p {
  margin-bottom: 1rem;
}

ul {
  margin-left: 1.5rem;
  margin-bottom: 1rem;
}

footer {
  margin-top: 4rem;
  padding: 1.5rem 1rem;
  font-size: 0.9rem;
  text-align: center;
  background: #eee;
  color: #555;
}

/* Callout boxes */
.callout {
  background: #e6f2ff;
  border-left: 5px solid #0b3c5d;
  padding: 1rem;
  margin: 1.5rem 0;
}

/* Buttons */
.button {
  display: inline-block;
  background: #0b3c5d;
  color: white;
  padding: 0.6rem 1rem;
  border-radius: 4px;
  text-decoration: none;
  font-weight: 500;
}

.button:hover {
  background: #092f49;
}