body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0; padding: 0;
  background: #f9f9f9;
  color: #333;
}
header {
  background: #0d1b2a;
  color: white;
  padding: 20px;
  text-align: center;
}
nav ul {
  list-style: none;
  padding: 0;
  display: flex;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  margin: 0;
}
nav ul li a {
  color: white;
  text-decoration: none;
  font-weight: 600;
}
.banner {
  background: #1b263b;
  color: white;
  text-align: center;
  padding: 50px 20px;
}
.btn {
  background: #00b4d8;
  color: white;
  padding: 10px 25px;
  text-decoration: none;
  border-radius: 5px;
  display: inline-block;
  margin-top: 15px;
}
section {
  max-width: 900px;
  margin: 40px auto;
  padding: 0 15px;
}
.review {
  background: white;
  margin: 10px 0;
  padding: 15px;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgb(0 0 0 / 0.1);
}
input, textarea, select, button {
  width: 100%;
  max-width: 400px;
  margin: 8px 0;
  padding: 10px;
  border-radius: 6px;
  border: 1px solid #ccc;
  font-size: 1rem;
  box-sizing: border-box;
}
button {
  background: #0077b6;
  color: white;
  border: none;
  cursor: pointer;
  max-width: 420px;
}
@media (max-width: 600px) {
  nav ul {
    flex-direction: column;
  }
}
#userPreview {
  background: #e7f9e7;
  padding: 10px;
  margin-top: 10px;
  border-radius: 6px;
  display: none;
}
p.note {
  color: red;
  font-weight: bold;
}