body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
}

header {
  background: #003366;
  padding: 15px;
  color: #fff;
}

nav a {
  color: #fff;
  margin-right: 15px;
  text-decoration: none;
}

.hero {
  padding: 50px;
  background: #f0f4ff;
  text-align: center;
}

.btn {
  background: #003366;
  color: #fff;
  padding: 10px 20px;
  text-decoration: none;
  border-radius: 5px;
}

section {
  padding: 20px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 15px;
}

.card {
  background: #f8f8f8;
  padding: 20px;
  text-align: center;
  border-radius: 5px;
}

footer {
  background: #003366;
  color: #fff;
  text-align: center;
  padding: 10px;
}

/* ---------------- Hamburger Menu Styles ---------------- */
.hamburger {
  display: none;
  font-size: 28px;
  cursor: pointer;
  color: #fff;
}

/* ---------------- Mobile Responsiveness ---------------- */
@media (max-width: 768px) {

  /* HEADER & HAMBURGER */
  header {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  header h1 {
    font-size: 18px;
  }

  .hamburger {
    display: block;
  }

  nav {
    display: none;        /* hidden by default on mobile */
    background: #003366;
    padding: 10px;
    width: 100%;
  }

  nav a {
    display: block;
    margin: 10px 0;
  }

  /* HERO */
  .hero {
    padding: 30px;
    text-align: center;
  }

  .hero h2 {
    font-size: 22px;
    line-height: 28px;
  }

  .hero p {
    font-size: 16px;
  }

  /* GRID */
  .grid {
    grid-template-columns: 1fr;
  }

  /* SECTIONS */
  section {
    padding: 15px;
  }

  /* CARD */
  .card {
    padding: 15px;
    font-size: 16px;
  }
}