body {
  font-family: Arial, sans-serif;
  margin: 0;
  background: #f5f5f5;
  color: #2c3e50;
}

header {
  background: #ffffff;
  padding: 20px;
  text-align: center;
  border-bottom: 1px solid #ddd;
}

nav a {
  margin: 0 20px;
  text-decoration: none;
  color: #2980b9;
  font-weight: bold;
}

.container {
  max-width: 900px;
  margin: 40px auto;
  padding: 20px;
}

.section {
  background: white;
  padding: 25px;
  border-radius: 12px;
  margin-bottom: 25px;
  box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

h1, h2 {
  color: #1f2d3d;
}