body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f8f9fb;
  color: #1f2937;
}

header {
  background: linear-gradient(135deg, #0f172a, #1e3a8a);
  color: white;
  text-align: center;
  padding: 40px 20px;
}

.hero-img {
  width: 100%;
  max-height: 400px;
  object-fit: cover;
  border-radius: 0 0 20px 20px;
  margin-bottom: 30px;
}

.btn-gold {
  display: inline-block;
  margin-top: 20px;
  padding: 12px 30px;
  background: #d4af37;
  color: #0f172a;
  text-decoration: none;
  border-radius: 6px;
  font-weight: bold;
}

section {
  padding: 50px 20px;
  max-width: 900px;
  margin: auto;
}

.simulateur form {
  display: grid;
  gap: 15px;
  max-width: 400px;
}

.simulateur input {
  padding: 10px;
  font-size: 1rem;
}

footer {
  background: #0f172a;
  color: white;
  text-align: center;
  padding: 20px;
}