body {
  font-family: 'Arial', sans-serif;
  color: #FFFFFF;
  background: #121c2a; /* A deep, uniform navy blue for elegance and simplicity */
  margin: 0;
  padding: 0;
  line-height: 1.6;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

img {
  max-width: 100%;
  height: auto;
}

header {
  background: #131c2b; /* Slightly lighter navy for subtle contrast */
  color: #FFFFFF;
  padding: 20px 0;
  text-align: center;
}

.header-content {
  width: 90%;
  margin: 0 auto;
  max-width: 1200px;
}

nav ul {
  list-style: none;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: center;
}

nav ul li {
  margin: 0 20px;
}

nav ul li a {
  color: #FFFFFF;
  text-decoration: none;
  padding: 7px 14px;
  transition: color 0.3s ease, background-color 0.3s ease;
}

nav ul li a:hover {
  color: #CCCCCC;
  background-color: #1a2734; /* A subtle hover effect for a refined look */
}

main, .card, .container {
  width: 85%;
  margin: 30px auto;
  max-width: 1200px;
  background-color: #222d3c; /* A dark slate gray for content sections */
  padding: 25px;
  border-radius: 10px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.5);
}

.card:hover {
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.7);
}

section {
  background: #131c2b; /* Matching the header for consistency */
  border-radius: 10px;
  padding: 25px;
  margin-bottom: 30px;
  box-shadow: 0 3px 6px rgba(0, 0, 0, 0.3);
}

h2, h3 {
  color: #FFFFFF;
  text-shadow: 1px 1px 3px rgba(0, 0, 0, 0.4);
}

footer {
  background: #131c2b;
  color: #FFFFFF;
  padding: 25px 0;
  text-align: center;
}

@media only screen and (max-width: 768px) {
  .header-content, main, .container {
    width: 95%;
  }

  nav ul li {
    margin: 0 5px;
  }
}