body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background: #0f172a;
  color: #f8fafc;
  text-align: center;
}

header.hero {
  padding: 3rem 1rem;
  background: linear-gradient(90deg, #1e293b, #334155);
  border-bottom: 3px solid #facc15;
}

header h1 {
  font-size: clamp(2rem, 6vw, 3rem);
  margin-bottom: 1rem;
}

.subtitle {
  color: #cbd5e1;
  margin-bottom: 2rem;
}

.card {
  background: #1e293b;
  border-radius: 1rem;
  padding: 2rem;
  margin: 2rem auto;
  max-width: 600px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.4);
}

.cta {
  margin: 2rem;
}

.cta button {
  background: #facc15;
  color: #1e293b;
  font-size: 1.2rem;
  font-weight: bold;
  border: none;
  padding: 1rem 2rem;
  border-radius: 2rem;
  cursor: pointer;
  transition: 0.3s;
}

.cta button:hover {
  background: #eab308;
}

footer {
  margin-top: 3rem;
  padding: 1rem;
  background: #111827;
  font-size: 0.9rem;
  color: #94a3b8;
}