/* Reset and Base Styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  font-family: 'Segoe UI', sans-serif;
  line-height: 1.6;
  background: #f9f9f9;
  color: #333;
  padding: 0 1rem;
}

/* Header/Nav */
header {
  background: #0d1b2a;
  color: white;
  padding: 1rem 0;
}
nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 960px;
  margin: 0 auto;
}
nav h1 {
  font-size: 1.5rem;
}
nav ul {
  list-style: none;
  display: flex;
  gap: 1rem;
}
nav a {
  color: #fff;
  text-decoration: none;
}
nav a:hover {
  text-decoration: underline;
}

/* Main Content */
main {
  max-width: 960px;
  margin: 2rem auto;
  padding: 1rem;
  background: white;
  border-radius: 8px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}
section + section {
  margin-top: 2rem;
}
h2 {
  margin-bottom: 0.5rem;
  color: #0d1b2a;
}
ul {
  padding-left: 1.5rem;
  margin-top: 0.5rem;
}
p {
  margin: 1rem 0;
}

/* Footer */
footer {
  text-align: center;
  padding: 1rem 0;
  background: #0d1b2a;
  color: white;
  margin-top: 2rem;
  font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 600px) {
  nav {
    flex-direction: column;
    gap: 1rem;
  }
}

/* Button Class */
.btn {
  display: inline-block;
  background: #1e90ff;
  color: white;
  padding: 0.6rem 1.2rem;
  text-decoration: none;
  border-radius: 4px;
  transition: background 0.3s ease;
}
.btn:hover {
  background: #006fdc;
}