body {
  background: url('img/fondo.png') no-repeat center center fixed;
  background-size: cover;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  padding: 0;
}

.card {
  border-radius: 20px;
  background-color: rgba(255, 255, 255, 0.95);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

h2 {
  color: #004d40;
  font-weight: bold;
}

p.text-muted {
  font-size: 0.95rem;
}

button.btn-success {
  background-color: #007f5f;
  border: none;
  font-size: 1rem;
  font-weight: 500;
  padding: 12px;
  border-radius: 10px;
  transition: background-color 0.3s ease;
}

button.btn-success:hover {
  background-color: #005f43;
}

.form-check {
  margin-right: 20px;
}

.form-check-label {
  font-size: 0.95rem;
}

.form-label {
  font-weight: 600;
  margin-bottom: 8px;
}

.resultado-estrés {
  font-size: 1.2rem;
  padding: 12px;
  margin-top: 16px;
  border-radius: 10px;
  font-weight: bold;
}

.bajo {
  background-color: #d4edda;
  color: #155724;
  border: 2px solid #c3e6cb;
}

.medio {
  background-color: #fff3cd;
  color: #856404;
  border: 2px solid #ffeeba;
}

.alto {
  background-color: #f8d7da;
  color: #721c24;
  border: 2px solid #f5c6cb;
}