body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  background: #f4f4f4;
  color: #333;
  scroll-behavior: smooth;
}

header {
  background: #0066cc;
  color: white;
  padding: 20px 0;
  text-align: center;
}

nav ul {
  list-style: none;
  display: flex;
  justify-content: center;
  gap: 30px;
  padding: 0;
  margin: 10px 0 0;
}

nav ul li a {
  color: white;
  text-decoration: none;
  font-weight: bold;
  transition: color 0.3s ease;
}

nav ul li a:hover {
  color: #ffcc00;
}

main {
  padding: 40px 20px;
}

.section {
  max-width: 800px;
  margin: 0 auto 60px;
  background: white;
  padding: 30px;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 1s ease, transform 1s ease;
}

.section.show {
  opacity: 1;
  transform: translateY(0);
}

footer {
  background: #222;
  color: white;
  text-align: center;
  padding: 20px 0;
}

.fade-in {
  animation: fadeIn 1.5s ease forwards;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}