* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Montserrat', sans-serif;
}
body {
  background: #f5f5f5;
  color: #333;
}
header {
  position: relative;
  text-align: center;
  background-color: #111;
  color: white;
}
.banner {
  width: 100%;
  height: 200px;
  object-fit: cover;
}
.header-content {
  position: relative;
  margin-top: -60px;
}
.perfil {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  border: 4px solid white;
  object-fit: cover;
  margin-top: -60px;
}
.navbar {
  display: flex;
  justify-content: center;
  background-color: #0077cc;
  padding: 10px 0;
  flex-wrap: wrap;
}
.navbar a {
  color: white;
  padding: 10px 20px;
  text-decoration: none;
  font-weight: bold;
}
.navbar a:hover {
  background-color: #005fa3;
}
main {
  padding: 20px;
  max-width: 900px;
  margin: auto;
}
h2 {
  margin: 30px 0 10px;
  border-left: 5px solid #0077cc;
  padding-left: 10px;
  color: #0077cc;
}
.card {
  background: white;
  padding: 20px;
  margin-bottom: 20px;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}
footer {
  text-align: center;
  background-color: #111;
  color: white;
  padding: 20px;
  margin-top: 40px;
}
@media (max-width: 600px) {
  .navbar {
    flex-direction: column;
  }
  .perfil {
    width: 100px;
    height: 100px;
  }
}