body {
  font-family: 'Segoe UI', sans-serif;
  background-color: #f8f9fa;
  color: #212529;
  max-width: 900px;
  margin: auto;
  padding: 2rem;
  line-height: 1.6;
}
.header {
  text-align: center;
  background: #e9f1fb;
  padding: 2rem;
  border-radius: 12px;
  margin-bottom: 2rem;
}
.header h1 {
  margin: 0;
  color: #0056b3;
}
.header p {
  color: #6c757d;
  font-size: 1.1rem;
}
nav {
  margin-bottom: 2rem;
  text-align: center;
}
nav a {
  margin: 0 15px;
  text-decoration: none;
  color: #007bff;
  font-weight: 500;
}
nav a:hover {
  text-decoration: underline;
}
h1, h2 {
  color: #343a40;
}
img.profile {
  max-width: 150px;
  border-radius: 50%;
  display: block;
  margin: 1rem auto;
}
footer {
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid #dee2e6;
  text-align: center;
  font-size: 0.9em;
  color: #6c757d;
}