:root {
  --primary: #1d4ed8;       /* azul corporativo */
  --primary-dark: #1e40af;  /* azul más oscuro */
  --secondary: #3b82f6;     /* azul claro para acentos/degradados */
  --dark: #1f2937;
  --light: #f3f4f6;
  --lighter: #fafbfc;
  --border: #e5e7eb;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --text-muted: #6b7280;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html,
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  color: var(--dark);
}

.btn {
  padding: 0.75rem 1.5rem;
  border-radius: 8px;
  border: none;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
  text-decoration: none;
  display: inline-block;
  font-size: 0.95rem;
  text-align: center;
}

.btn-primary {
  background: var(--primary);
  color: white;
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(29, 78, 216, 0.2);
}

.btn-secondary {
  background: white;
  color: var(--primary);
  border: 2px solid var(--primary);
}

.btn-secondary:hover {
  background: var(--light);
}

.form-message {
  padding: 1rem;
  border-radius: 8px;
  margin-bottom: 1rem;
  text-align: center;
}

.form-message.success {
  background: #d1fae5;
  color: #065f46;
}

.form-message.error {
  background: #fee2e2;
  color: #991b1b;
}

.loader {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 3px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: white;
  animation: ab_spin 1s ease-in-out infinite;
  vertical-align: -3px;
  margin-right: 8px;
}

@keyframes ab_spin {
  to {
    transform: rotate(360deg);
  }
}