/* ===================================
   MODALS STYLES
   Sistema de Modales - StudyQuality
   ================================== */

/* Modal Base */
.modal {
  display: none;
  position: fixed;
  z-index: var(--z-modal);
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: var(--overlay-color);
  backdrop-filter: blur(5px);
  animation: modalFadeIn 0.3s ease-out;
}

.modal.active {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-lg);
}

@keyframes modalFadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

/* Contenido del Modal */
.modal-content {
  background: var(--surface-color);
  border-radius: var(--border-radius-xl);
  box-shadow: var(--shadow-2xl);
  width: 100%;
  max-width: 600px;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  animation: modalSlideIn 0.3s ease-out;
  border: 1px solid var(--border-light);
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(-50px) scale(0.9);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* Header del Modal */
.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-xl);
  border-bottom: 2px solid var(--border-light);
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
  color: var(--text-inverse);
  border-radius: var(--border-radius-xl) var(--border-radius-xl) 0 0;
}

.modal-header h2 {
  margin: 0;
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-inverse);
}

.modal-close {
  background: none;
  border: none;
  color: var(--text-inverse);
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  cursor: pointer;
  padding: var(--spacing-xs);
  border-radius: var(--border-radius-sm);
  transition: all var(--transition-fast);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-close:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: rotate(90deg);
}

.modal-close:focus {
  outline: 2px solid var(--text-inverse);
  outline-offset: 2px;
}

/* Formulario del Modal */
.modal-form {
  padding: var(--spacing-xl);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-group label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  font-size: var(--font-size-sm);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: var(--spacing-md);
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius-md);
  font-size: var(--font-size-base);
  font-family: var(--font-family-primary);
  background: var(--surface-color);
  color: var(--text-primary);
  transition: all var(--transition-fast);
  resize: vertical;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.form-group textarea {
  min-height: 80px;
  font-family: var(--font-family-primary);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
  font-style: italic;
}

/* Estados de validación */
.form-group.has-error input,
.form-group.has-error select,
.form-group.has-error textarea {
  border-color: var(--danger-color);
  box-shadow: 0 0 0 3px rgba(231, 76, 60, 0.1);
}

.form-group.has-success input,
.form-group.has-success select {
  border-color: var(--success-color);
  box-shadow: 0 0 0 3px rgba(39, 174, 96, 0.1);
}

.form-error {
  display: block;
  color: var(--danger-color);
  font-size: var(--font-size-xs);
  margin-top: var(--spacing-xs);
  font-weight: var(--font-weight-medium);
  opacity: 0;
  transform: translateY(-5px);
  transition: all var(--transition-fast);
}

.form-group.has-error .form-error {
  opacity: 1;
  transform: translateY(0);
}

/* Acciones del Modal */
.modal-actions {
  display: flex;
  gap: var(--spacing-md);
  justify-content: flex-end;
  padding: var(--spacing-xl);
  padding-top: 0;
  border-top: 1px solid var(--border-light);
  margin-top: var(--spacing-lg);
}

.modal-actions .btn {
  min-width: 120px;
  position: relative;
  overflow: hidden;
}

/* Efectos de carga en modales */
.modal-loading {
  position: relative;
  pointer-events: none;
}

.modal-loading::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.8);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  border-radius: var(--border-radius-xl);
}

.modal-loading::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 40px;
  height: 40px;
  border: 4px solid var(--border-light);
  border-top: 4px solid var(--primary-color);
  border-radius: var(--border-radius-full);
  animation: spin 1s linear infinite;
  z-index: 101;
}

/* Variantes de Modal */
.modal.modal-sm .modal-content {
  max-width: 400px;
}

.modal.modal-lg .modal-content {
  max-width: 800px;
}

.modal.modal-xl .modal-content {
  max-width: 1200px;
}

/* Modal de Confirmación */
.modal-confirm .modal-header {
  background: var(--warning-color);
}

.modal-confirm .modal-content {
  text-align: center;
  max-width: 450px;
}

.modal-confirm .confirm-icon {
  font-size: var(--font-size-4xl);
  color: var(--warning-color);
  margin-bottom: var(--spacing-lg);
}

.modal-confirm .confirm-message {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-xl);
  color: var(--text-primary);
}

.modal-confirm .modal-actions {
  justify-content: center;
  gap: var(--spacing-lg);
}

/* Modal de Información */
.modal-info .modal-header {
  background: var(--info-color);
}

.modal-success .modal-header {
  background: var(--success-color);
}

.modal-error .modal-header {
  background: var(--danger-color);
}

/* Responsive para modales */
@media (max-width: 768px) {
  .modal {
    padding: var(--spacing-md);
  }
  
  .modal-content {
    max-width: none;
    width: 100%;
    max-height: 95vh;
    border-radius: var(--border-radius-lg);
  }
  
  .modal-header {
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
  }
  
  .modal-header h2 {
    font-size: var(--font-size-lg);
  }
  
  .modal-form {
    padding: var(--spacing-lg);
  }
  
  .form-row {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
  }
  
  .modal-actions {
    padding: var(--spacing-lg);
    flex-direction: column-reverse;
  }
  
  .modal-actions .btn {
    width: 100%;
    min-width: auto;
  }
}

@media (max-width: 480px) {
  .modal {
    padding: var(--spacing-sm);
  }
  
  .modal-header {
    padding: var(--spacing-md);
    flex-direction: column;
    gap: var(--spacing-sm);
    text-align: center;
  }
  
  .modal-close {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
  }
  
  .modal-form {
    padding: var(--spacing-md);
  }
  
  .form-group input,
  .form-group select,
  .form-group textarea {
    font-size: var(--font-size-base);
  }
  
  .modal-actions {
    padding: var(--spacing-md);
  }
}

/* Animaciones de cierre */
.modal.closing {
  animation: modalFadeOut 0.3s ease-in;
}

.modal.closing .modal-content {
  animation: modalSlideOut 0.3s ease-in;
}

@keyframes modalFadeOut {
  from {
    opacity: 1;
  }
  to {
    opacity: 0;
  }
}

@keyframes modalSlideOut {
  from {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
  to {
    opacity: 0;
    transform: translateY(-50px) scale(0.9);
  }
}

/* Campos con iconos */
.form-group.has-icon {
  position: relative;
}

.form-group.has-icon input {
  padding-left: 40px;
}

.form-group.has-icon .form-icon {
  position: absolute;
  left: var(--spacing-md);
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: var(--font-size-lg);
  pointer-events: none;
}

.form-group.has-icon.has-error .form-icon {
  color: var(--danger-color);
}

.form-group.has-icon.has-success .form-icon {
  color: var(--success-color);
}

/* Switch toggle */
.form-switch {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  cursor: pointer;
}

.form-switch input[type="checkbox"] {
  display: none;
}

.form-switch .switch-slider {
  width: 50px;
  height: 26px;
  background: var(--border-color);
  border-radius: 13px;
  position: relative;
  transition: all var(--transition-fast);
}

.form-switch .switch-slider::before {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 22px;
  height: 22px;
  background: var(--surface-color);
  border-radius: var(--border-radius-full);
  transition: all var(--transition-fast);
  box-shadow: var(--shadow-sm);
}

.form-switch input:checked + .switch-slider {
  background: var(--primary-color);
}

.form-switch input:checked + .switch-slider::before {
  transform: translateX(24px);
}

.form-switch:hover .switch-slider {
  box-shadow: var(--shadow-md);
}

/* Modo oscuro */
@media (prefers-color-scheme: dark) {
  .modal-content {
    background: rgba(44, 62, 80, 0.95);
    border-color: rgba(255, 255, 255, 0.1);
  }
  
  .modal-form {
    background: transparent;
  }
  
  .form-group input,
  .form-group select,
  .form-group textarea {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.2);
    color: var(--text-inverse);
  }
  
  .form-group input:focus,
  .form-group select:focus,
  .form-group textarea:focus {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--primary-color);
  }
  
  .modal-actions {
    border-color: rgba(255, 255, 255, 0.1);
  }
}

/* Accesibilidad */
@media (prefers-reduced-motion: reduce) {
  .modal,
  .modal-content {
    animation: none;
  }
  
  .modal-close:hover {
    transform: none;
  }
}

/* Focus trap para modales */
.modal[aria-hidden="false"] {
  display: flex;
}

.modal[aria-hidden="true"] {
  display: none;
}

/* Estados de validación en tiempo real */
.form-group input:valid:not(:placeholder-shown) {
  border-color: var(--success-color);
}

.form-group input:invalid:not(:placeholder-shown):not(:focus) {
  border-color: var(--danger-color);
}

/* Efectos de hover en elementos interactivos */
.modal-header:hover {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--secondary-color) 100%);
}

/* Loading específico para botones del modal */
.modal-actions .btn.loading {
  position: relative;
  color: transparent;
}

.modal-actions .btn.loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 20px;
  height: 20px;
  border: 2px solid transparent;
  border-top: 2px solid currentColor;
  border-radius: var(--border-radius-full);
  animation: spin 1s linear infinite;
  color: var(--text-inverse);
}