body {
  font-family: system-ui, sans-serif;
  margin: 0;
  background: #fdfdfd;
  color: #333;
}

header {
  background: #0a192f;
  color: white;
  padding: 1rem 2rem;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

nav ul {
  list-style: none;
  margin: 0;
  display: flex;
  gap: 1rem;
}

nav a {
  color: white;
  text-decoration: none;
}

nav a.active {
  border-bottom: 2px solid #64ffda;
}

.hero {
  text-align: center;
  padding: 3rem 1rem;
}

.profile-img {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  object-fit: cover;
  margin-bottom: 1rem;
}

.btn {
  display: inline-block;
  padding: 0.6rem 1.2rem;
  margin-top: 1rem;
  background: #64ffda;
  color: #0a192f;
  text-decoration: none;
  border-radius: 4px;
}

footer {
  text-align: center;
  padding: 1rem;
  margin-top: 3rem;
  background: #f4f4f4;
  color: #555;
}