body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: linear-gradient(135deg, #0f172a, #1e293b);
  color: white;
  text-align: center;
}

.header {
  padding: 40px 20px;
}

.header h1 {
  margin: 0;
  font-size: 40px;
}

nav {
  margin-top: 20px;
}

nav a {
  margin: 8px;
  color: white;
  text-decoration: none;
  padding: 10px 15px;
  background: rgba(255,255,255,0.1);
  border-radius: 10px;
}

nav a:hover {
  background: rgba(255,255,255,0.2);
}

main {
  padding: 20px;
}

.card {
  background: rgba(255,255,255,0.08);
  padding: 25px;
  margin: 20px auto;
  border-radius: 15px;
  max-width: 600px;
}

.btn {
  display: inline-block;
  margin-top: 15px;
  padding: 12px 20px;
  background: #2563eb;
  color: white;
  text-decoration: none;
  border-radius: 10px;
}

.btn:hover {
  background: #1d4ed8;
}

audio {
  width: 100%;
}

footer {
  margin-top: 40px;
  padding: 20px;
  opacity: 0.7;
}