body, h1, h2, h3, h4, p, ul {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  background-color: #0a192f; 
  color: #ccd6f6; 
  line-height: 1.6;
  margin: 0;
}

header {
  background-color: #112240; 
  padding: 1em 0;
  text-align: center;
  border-bottom: 2px solid #64ffda; 
}

header h1 {
  color: #64ffda;
  font-size: 2.5em;
  text-align: center
}

nav ul {
  list-style: none;
  margin-top: 1em;
  padding: 0;
}

nav ul li {
  display: inline-block;
  margin: 0 15px;
}

nav ul li a {
  text-decoration: none;
  color: #ccd6f6;
  font-size: 1.2em;
  transition: color 0.3s ease-in-out;
}

nav ul li a:hover {
  color: #64ffda; 
}

main {
  padding: 2em;
  max-width: 900px;
  margin: 0 auto;
}

main h2 {
  color: #64ffda;
  margin-bottom: 1em;
  font-size: 2em;
  border-bottom: 2px solid #112240;
  padding-bottom: 0.5em;
  text-align: center
}

main h3, main h4 {
  color: #64ffda; 
  margin-top: 1em;
}

main p, main ul {
  color: #ccd6f6;
  margin-top: 0.5em;
}

main ul {
  list-style: none; 
  padding: 0; 
  display: grid; 
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); 
  gap: 1em; 
  margin-top: 1em;
}

main ul li {
  background-color: #1c2d4a; 
  padding: 1em;
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
  transition: transform 0.3s, box-shadow 0.3s;
}

main ul li:hover {
  transform: translateY(-5px);
  box-shadow: 0 6px 10px rgba(0, 0, 0, 0.5);
}

main ul li a {
  text-decoration: none;
  color: #a9c4ff;
  font-size: 1em;
  display: block;
  text-align: center;
  word-wrap: break-word;
  transition: color 0.3s ease-in-out;
}

main ul li a:hover {
  color: #e6f1ff; 
}

footer {
  background-color: #112240;
  text-align: center;
  padding: 1em 0;
  color: #a8b2d1;
  font-size: 0.9em;
  margin-top: 2em;
}

footer p {
  margin: 0;
}

@media (max-width: 768px) {
  nav ul li {
    display: block;
    margin: 10px 0;
  }

  nav ul li a {
    font-size: 1em;
  }

  header h1 {
    font-size: 2em;
  }
}