body {
  background: linear-gradient(135deg, #f0e3d4, #d4c0b0);
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  padding: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.card-container {
  width: 100%;
  max-width: 900px;
  margin: 30px auto; /* marge verticale et centrage horizontal */
  padding: 0 15px;
  box-sizing: border-box;
  display: flex;
  flex-direction: row;
  background-color: white;
  border-radius: 15px;
  overflow: hidden;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.intro-section {
  flex: 1;
  background: linear-gradient(90deg, #2c3e50, #34495e);
  color: white;
  padding: 30px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  font-family: "Merriweather", serif;
}

.intro-section h1 {
  font-size: 2rem;
  margin-bottom: 1rem;
}

.intro-section p {
  font-size: 1.1rem;
  opacity: 0.9;
}

.form-section {
  flex: 1;
  padding: 30px;
}

.card-header {
  font-size: 1.5rem;
  margin-bottom: 20px;
  color: #2c3e50;
  text-align: center;
}

.form-control {
  border-radius: 8px;
  margin-bottom: 15px;
}

.btn-primary {
  background-color: #2c3e50;
  border: none;
  width: 100%;
  transition: background-color 0.3s ease;
}

.btn-primary:hover {
  background-color: #1a252f;
}

.btn-secondary {
  background-color: #6c757d;
  border: none;
  width: 100%;
}

.btn-secondary:hover {
  background-color: #5a6268;
}

.alert {
  border-radius: 8px;
}

a {
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.no-underline-hover:hover {
  text-decoration: none;
}

@media (max-width: 768px) {
  .card-container {
    flex-direction: column;
    margin: 20px; /* ajout de marge extérieure sur petits écrans */
  }

  .intro-section,
  .form-section {
    width: 100%;
    padding: 20px;
  }

  .intro-section {
    text-align: center;
  }
}