:root {
  --primary: #0a2540;
  --secondary: #1f6ae1;
  --accent: #e6f0ff;
  --text-dark: #1a1a1a;
  --text-light: #6b7280;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Segoe UI", system-ui, sans-serif;
}

body {
  background: #f8fbff;
  color: var(--text-dark);
  line-height: 1.6;
}

nav {
  background: var(--primary);
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: #fff;
}

nav h1 {
  font-size: 1.5rem;
}

nav ul {
  list-style: none;
  display: flex;
  gap: 1.5rem;
}

nav ul li a {
  color: #fff;
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
}

nav ul li a:hover {
  color: var(--secondary);
}

header {
  height: 300px;
  background: linear-gradient(to right, var(--primary), var(--secondary));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

header h2 {
  font-size: 2.5rem;
}

main {
  max-width: 1100px;
  margin: 2rem auto;
  padding: 1rem;
}

.card {
  background: #fff;
  border-radius: 12px;
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: 0 10px 25px rgba(0,0,0,0.08);
}

footer {
  background: var(--primary);
  color: #fff;
  text-align: center;
  padding: 1.5rem;
}