/**
 * css/components.css — Componentes reutilizables del sistema
 * 
 * Incluye: layout de app, sidebar, topbar, stat-cards,
 * badges de estado, botones, formularios, toasts, alertas,
 * tabla de datos, loader, modal de confirmación.
 * 
 * REQUIERE: variables.css cargado primero.
 */

/* ============================================================
  1. LAYOUT PRINCIPAL DE APLICACIÓN (App Shell)
   ============================================================ */
.app-shell {
  display: flex;
  height: 100vh;
  overflow: hidden;
  background: var(--color-bg);
}

.app-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
  /* evita overflow en flex */
}

.app-main {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-8);
}

/* ============================================================
  2. SIDEBAR OSCURO (estilo EduSaaS)
   ============================================================ */
.sidebar {
  width: var(--sidebar-width);
  background: var(--sidebar-bg);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  transition: var(--transition-normal);
  overflow: hidden;
  position: relative;
  z-index: var(--z-sticky);
}

/* Marca de agua sutil en sidebar */
.sidebar::before {
  content: '';
  position: absolute;
  bottom: 0;
  right: 0;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(102, 126, 234, 0.08) 0%, transparent 70%);
  pointer-events: none;
}

/* Encabezado del sidebar — logo + nombre institución */
.sidebar-header {
  padding: var(--space-5) var(--space-6);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  border-bottom: 1px solid var(--sidebar-border);
  min-height: var(--topbar-height);
}

.sidebar-logo {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.25);
  flex-shrink: 0;
  overflow: hidden;
}

.sidebar-logo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: var(--radius-md);
}

.sidebar-logo-initials {
  color: #fff;
  font-size: var(--font-size-lg);
  font-weight: 800;
  letter-spacing: -0.5px;
}

.sidebar-brand h2 {
  color: #f1f5f9;
  font-size: var(--font-size-sm);
  font-weight: 700;
  line-height: 1.2;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 160px;
}

.sidebar-brand .sidebar-plan {
  display: inline-block;
  font-size: var(--font-size-xs);
  color: var(--sidebar-active);
  background: rgba(102, 126, 234, 0.12);
  padding: 1px 8px;
  border-radius: var(--radius-full);
  margin-top: 2px;
  font-weight: 600;
}

/* Navegación del sidebar */
.sidebar-nav {
  flex: 1;
  padding: var(--space-4) var(--space-3);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sidebar-section-title {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--sidebar-border);
  padding: var(--space-4) var(--space-3) var(--space-2);
}

/* Nav Item */
.nav-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 10px var(--space-3);
  border-radius: var(--radius-md);
  color: var(--sidebar-text);
  font-size: var(--font-size-sm);
  font-weight: 500;
  transition: var(--transition-fast);
  text-decoration: none;
  position: relative;
  border: none;
  background: transparent;
  width: 100%;
  cursor: pointer;
  text-align: left;
}

.nav-item:hover {
  background: rgba(255, 255, 255, 0.06);
  color: var(--sidebar-text-hover);
}

.nav-item.active {
  background: var(--sidebar-active-bg);
  color: #fff;
  font-weight: 600;
}

.nav-item.active .nav-icon {
  color: var(--sidebar-active);
}

.nav-item.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 60%;
  background: var(--sidebar-active);
  border-radius: 0 3px 3px 0;
}

.nav-icon {
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--sidebar-text);
  font-size: 16px;
  transition: var(--transition-fast);
}

.nav-item:hover .nav-icon {
  color: var(--sidebar-text-hover);
}

.nav-item .nav-chevron {
  margin-left: auto;
  opacity: 0.4;
  font-size: 12px;
  transition: var(--transition-fast);
}

.nav-item.active .nav-chevron {
  opacity: 0.6;
}

/* Footer del sidebar */
.sidebar-footer {
  padding: var(--space-4) var(--space-3);
  border-top: 1px solid var(--sidebar-border);
}

.sidebar-user {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-2);
}

.sidebar-user-avatar {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-full);
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
  border: 2px solid rgba(102, 126, 234, 0.4);
}

.sidebar-user-info {
  min-width: 0;
}

.sidebar-user-name {
  color: #e2e8f0;
  font-size: var(--font-size-sm);
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-user-role {
  color: var(--sidebar-text);
  font-size: var(--font-size-xs);
}

/* ============================================================
  3. TOPBAR
   ============================================================ */
.topbar {
  height: var(--topbar-height);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 var(--space-8);
  flex-shrink: 0;
  box-shadow: var(--shadow-sm);
  z-index: var(--z-sticky);
}

.topbar-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-text);
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

/* ============================================================
  4. STAT CARDS (KPI Cards del Dashboard — estilo EduSaaS)
   ============================================================ */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-6);
  margin-bottom: var(--space-8);
}

.stat-card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  display: flex;
  align-items: center;
  gap: var(--space-5);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.stat-card::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 80px;
  height: 80px;
  background: var(--stat-color, var(--color-primary));
  opacity: 0.04;
  border-radius: 0 var(--radius-lg) 0 80px;
}

.stat-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

.stat-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-full);
  background: var(--stat-color, var(--color-primary));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 22px;
  flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* .stat-info {
} */

.stat-label {
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: var(--space-1);
}

.stat-value {
  font-size: var(--font-size-2xl);
  font-weight: 800;
  color: var(--color-text);
  line-height: 1;
}

.stat-sub {
  font-size: var(--font-size-xs);
  color: var(--color-text-light);
  margin-top: 2px;
}

/* Variantes de color para stat-cards */
.stat-card.primary {
  --stat-color: var(--color-primary);
}

.stat-card.success {
  --stat-color: var(--color-success);
}

.stat-card.warning {
  --stat-color: var(--color-warning);
}

.stat-card.danger {
  --stat-color: var(--color-danger);
}

.stat-card.info {
  --stat-color: var(--color-info);
}

/* ============================================================
  5. BADGES DE ESTADO (Status Badges)
   ============================================================ */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: 600;
  border: 1px solid transparent;
  white-space: nowrap;
}

.badge-pagada {
  background: var(--color-success-bg);
  color: var(--color-success-text);
  border-color: #86efac;
}

.badge-pendiente {
  background: var(--color-warning-bg);
  color: var(--color-warning-text);
  border-color: #fde68a;
}

.badge-vencida {
  background: var(--color-danger-bg);
  color: var(--color-danger-text);
  border-color: #fca5a5;
}

.badge-info {
  background: var(--color-info-bg);
  color: var(--color-info-text);
  border-color: #93c5fd;
}

/* ============================================================
  6. BOTONES
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 9px 18px;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 600;
  border: 2px solid transparent;
  cursor: pointer;
  transition: var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
  font-family: var(--font-family);
}

.btn:active {
  transform: translateY(1px);
}

.btn-primary {
  background: var(--gradient-primary);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 2px 8px rgba(102, 126, 234, 0.35);
}

.btn-primary:hover {
  filter: brightness(1.08);
  box-shadow: 0 4px 16px rgba(102, 126, 234, 0.45);
  transform: translateY(-1px);
  color: #fff;
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn-secondary:hover {
  background: var(--color-bg);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn-success {
  background: var(--color-success);
  color: #fff;
  border-color: transparent;
}

.btn-success:hover {
  background: #059669;
  transform: translateY(-1px);
  color: #fff;
}

.btn-danger {
  background: var(--color-danger);
  color: #fff;
  border-color: transparent;
}

.btn-danger:hover {
  background: #dc2626;
  transform: translateY(-1px);
  color: #fff;
}

.btn-sm {
  padding: 5px 12px;
  font-size: var(--font-size-xs);
  border-radius: var(--radius-sm);
}

.btn-lg {
  padding: 12px 28px;
  font-size: var(--font-size-md);
  border-radius: var(--radius-lg);
}

.btn-icon {
  width: 36px;
  height: 36px;
  padding: 0;
  justify-content: center;
  border-radius: var(--radius-md);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none !important;
}

/* ============================================================
  7. FORMULARIOS
   ============================================================ */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-label {
  font-size: var(--font-size-sm);
  font-weight: 600;
  color: var(--color-text);
}

.form-label .required {
  color: var(--color-danger);
  margin-left: 2px;
}

.form-control {
  width: 100%;
  padding: 10px 14px;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  color: var(--color-text);
  background: var(--color-surface);
  transition: var(--transition-fast);
  outline: none;
  font-family: var(--font-family);
}

.form-control:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.12);
}

.form-control::placeholder {
  color: var(--color-text-light);
}

.form-control.is-invalid {
  border-color: var(--color-danger);
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.12);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-5);
}

.form-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
}

/* Search input especial */
.search-wrapper {
  position: relative;
}

.search-wrapper .search-icon-left {
  position: absolute;
  left: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-text-light);
  pointer-events: none;
}

.search-wrapper .form-control {
  padding-left: 40px;
}

/* Autocomplete dropdown */
.search-dropdown {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  right: 0;
  background: var(--color-surface);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: var(--z-dropdown);
  max-height: 280px;
  overflow-y: auto;
  display: none;
}

.search-dropdown.show {
  display: block;
}

.search-dropdown-item {
  padding: 11px 16px;
  cursor: pointer;
  border-bottom: 1px solid var(--color-border);
  transition: var(--transition-fast);
}

.search-dropdown-item:last-child {
  border-bottom: none;
}

.search-dropdown-item:hover {
  background: var(--color-primary-light);
}

.search-dropdown-item strong {
  display: block;
  color: var(--color-text);
  font-size: var(--font-size-sm);
}

.search-dropdown-item small {
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
}

/* ============================================================
  8. CARD CONTENEDOR GENÉRICO
   ============================================================ */
.card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.card-header {
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.card-title {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.card-title i {
  color: var(--color-primary);
}

.card-body {
  padding: var(--space-6);
}

.card-footer {
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-border);
  background: var(--color-bg);
}

/* ============================================================
  9. TABLA DE DATOS
   ============================================================ */
.data-table-wrapper {
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.data-table thead tr {
  background: var(--color-bg);
}

.data-table th {
  padding: 12px 16px;
  font-size: var(--font-size-xs);
  font-weight: 700;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}

.data-table td {
  padding: 14px 16px;
  font-size: var(--font-size-sm);
  color: var(--color-text);
  border-bottom: 1px solid var(--color-border);
  vertical-align: middle;
}

.data-table tbody tr:hover {
  background: var(--color-primary-light);
}

.data-table tbody tr:last-child td {
  border-bottom: none;
}

.data-table .text-right {
  text-align: right;
}

.data-table .text-center {
  text-align: center;
}

/* Celda de avatar / nombre */
.table-user {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.table-avatar {
  width: 34px;
  height: 34px;
  border-radius: var(--radius-full);
  background: var(--color-primary-light);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-sm);
  font-weight: 700;
  flex-shrink: 0;
}

/* ============================================================
  10. INFO BOX (datos del estudiante seleccionado)
   ============================================================ */
.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-4);
}

.info-box {
  background: var(--color-bg);
  border-radius: var(--radius-md);
  padding: 12px 16px;
  border-left: 3px solid var(--color-primary);
}

.info-box-label {
  font-size: var(--font-size-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.4px;
  margin-bottom: 4px;
}

.info-box-value {
  font-size: var(--font-size-md);
  font-weight: 700;
  color: var(--color-text);
}

/* ============================================================
  11. TABLA DE CONCEPTOS (facturación)
   ============================================================ */
.concepts-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--space-4);
}

.concepts-table th {
  background: var(--gradient-primary);
  color: #fff;
  padding: 10px 12px;
  font-size: var(--font-size-xs);
  font-weight: 600;
  text-align: left;
  letter-spacing: 0.4px;
}

.concepts-table td {
  padding: 10px 8px;
  border-bottom: 1px solid var(--color-border);
  vertical-align: middle;
}

.concepts-table .form-control {
  padding: 7px 10px;
  border-radius: var(--radius-sm);
}

/* ============================================================
  12. TOTALES BOX
   ============================================================ */
.totals-box {
  background: var(--color-bg);
  border-radius: var(--radius-md);
  padding: var(--space-5);
  border: 1px solid var(--color-border);
}

.total-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-2) 0;
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.total-row.final {
  border-top: 2px solid var(--color-primary);
  margin-top: var(--space-3);
  padding-top: var(--space-3);
  font-size: var(--font-size-xl);
  font-weight: 800;
  color: var(--color-primary);
}

/* ============================================================
  13. HISTORIAL SIDEBAR ITEMS
   ============================================================ */
.history-item {
  padding: var(--space-3) var(--space-4);
  margin-bottom: var(--space-2);
  background: var(--color-bg);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: var(--transition-fast);
  border-left: 3px solid transparent;
}

.history-item:hover {
  background: var(--color-primary-light);
  border-left-color: var(--color-primary);
}

.history-item strong {
  display: block;
  font-size: var(--font-size-sm);
  color: var(--color-text);
  font-weight: 600;
}

.history-item small {
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  line-height: 1.4;
}

.history-item .history-amount {
  color: var(--color-primary);
  font-weight: 700;
  font-size: var(--font-size-sm);
}

/* ============================================================
  14. TOAST / ALERTAS FLOTANTES
   ============================================================ */
.toast-container {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 14px 18px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  min-width: 280px;
  max-width: 400px;
  pointer-events: all;
  animation: toastIn 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: #fff;
}

.toast.toast-success {
  background: #065f46;
  border-left: 4px solid #10b981;
}

.toast.toast-danger {
  background: #7f1d1d;
  border-left: 4px solid #ef4444;
}

.toast.toast-warning {
  background: #78350f;
  border-left: 4px solid #f59e0b;
}

.toast.toast-info {
  background: #1e3a5f;
  border-left: 4px solid #3b82f6;
}

.toast .toast-icon {
  font-size: 18px;
  flex-shrink: 0;
}

.toast .toast-close {
  margin-left: auto;
  background: none;
  border: none;
  color: rgba(255, 255, 255, 0.7);
  font-size: 16px;
  cursor: pointer;
  padding: 0 0 0 var(--space-2);
  transition: var(--transition-fast);
  flex-shrink: 0;
}

.toast .toast-close:hover {
  color: #fff;
}

@keyframes toastIn {
  from {
    transform: translateX(110%);
    opacity: 0;
  }

  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@keyframes toastOut {
  from {
    transform: translateX(0);
    opacity: 1;
  }

  to {
    transform: translateX(110%);
    opacity: 0;
  }
}

/* ============================================================
  15. LOADER / OVERLAY
   ============================================================ */
.loader-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.60);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-overlay);
  animation: fadeIn 0.2s ease;
  backdrop-filter: blur(2px);
}

.loader-box {
  text-align: center;
  color: #fff;
}

.loader-spinner {
  width: 48px;
  height: 48px;
  border: 4px solid rgba(255, 255, 255, 0.25);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto var(--space-4);
}

.loader-box p {
  font-size: var(--font-size-md);
  font-weight: 600;
  opacity: 0.9;
}

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

/* ============================================================
  16. MODAL DE CONFIRMACIÓN
   ============================================================ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.50);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-modal);
  animation: fadeIn 0.2s ease;
  backdrop-filter: blur(4px);
  padding: var(--space-4);
}

.modal {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  max-width: 420px;
  width: 100%;
  animation: modalIn 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  overflow: hidden;
}

.modal-header {
  padding: var(--space-6);
  border-bottom: 1px solid var(--color-border);
}

.modal-header h3 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-text);
}

.modal-body {
  padding: var(--space-6);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  line-height: 1.6;
}

.modal-footer {
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-border);
  display: flex;
  gap: var(--space-3);
  justify-content: flex-end;
}

@keyframes modalIn {
  from {
    transform: scale(0.9);
    opacity: 0;
  }

  to {
    transform: scale(1);
    opacity: 1;
  }
}

/* ============================================================
  17. ESTADO VACÍO (Empty State)
   ============================================================ */
.empty-state {
  text-align: center;
  padding: var(--space-12) var(--space-8);
  color: var(--color-text-muted);
}

.empty-state i {
  font-size: 56px;
  opacity: 0.3;
  margin-bottom: var(--space-4);
  display: block;
}

.empty-state h3 {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.empty-state p {
  font-size: var(--font-size-sm);
  max-width: 300px;
  margin: 0 auto;
}

/* ============================================================
  18. ACCIONES RÁPIDAS (Dashboard)
   ============================================================ */
.quick-actions-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

.quick-action {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-5);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  cursor: pointer;
  transition: var(--transition-normal);
  text-align: center;
  text-decoration: none;
  color: var(--color-text);
  gap: var(--space-2);
}

.quick-action:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.quick-action .qa-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: var(--color-primary-light);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  transition: var(--transition-fast);
}

.quick-action:hover .qa-icon {
  background: var(--color-primary);
  color: #fff;
  transform: scale(1.1);
}

.quick-action strong {
  font-size: var(--font-size-sm);
  font-weight: 700;
  color: var(--color-text);
}

.quick-action span {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

/* ============================================================
  19. SECCIÓN DE FACTURA (paneles colapsables)
   ============================================================ */
.invoice-section {
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-border);
}

.invoice-section:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.invoice-section-title {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--font-size-md);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-5);
}

.invoice-section-title i {
  width: 32px;
  height: 32px;
  background: var(--color-primary-light);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
}

/* ============================================================
  20. RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  :root {
    --sidebar-width: 220px;
  }

  .app-main {
    padding: var(--space-5);
  }
}

@media (max-width: 768px) {
  .sidebar {
    display: none;
  }

  .sidebar.open {
    display: flex;
    position: fixed;
    inset: 0;
    z-index: var(--z-overlay);
    width: 280px;
    animation: slideInLeft 0.3s ease;
  }

  @keyframes slideInLeft {
    from {
      transform: translateX(-100%);
    }

    to {
      transform: translateX(0);
    }
  }

  .topbar {
    padding: 0 var(--space-4);
  }

  .app-main {
    padding: var(--space-4);
  }

  .stats-grid {
    grid-template-columns: 1fr 1fr;
  }

  .form-grid-2 {
    grid-template-columns: 1fr;
  }

  .quick-actions-grid {
    grid-template-columns: 1fr 1fr;
  }

  .data-table th {
    font-size: 10px;
    padding: 10px 10px;
  }

  .data-table td {
    padding: 10px 10px;
    font-size: var(--font-size-xs);
  }
}

@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .quick-actions-grid {
    grid-template-columns: 1fr;
  }

  .toast-container {
    left: var(--space-4);
    right: var(--space-4);
  }

  .toast {
    min-width: unset;
  }
}

/* ============================================================
  21. UTILIDADES
   ============================================================ */
.text-primary {
  color: var(--color-primary);
}

.text-success {
  color: var(--color-success);
}

.text-warning {
  color: var(--color-warning);
}

.text-danger {
  color: var(--color-danger);
}

.text-muted {
  color: var(--color-text-muted);
}

.fw-bold {
  font-weight: 700;
}

.fw-medium {
  font-weight: 500;
}

.fs-sm {
  font-size: var(--font-size-sm);
}

.fs-xs {
  font-size: var(--font-size-xs);
}

.d-none {
  display: none !important;
}

.d-flex {
  display: flex;
}

.d-grid {
  display: grid;
}

.align-center {
  display: flex;
  align-items: center;
}

.justify-between {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.gap-2 {
  gap: var(--space-2);
}

.gap-3 {
  gap: var(--space-3);
}

.gap-4 {
  gap: var(--space-4);
}

.mb-4 {
  margin-bottom: var(--space-4);
}

.mb-6 {
  margin-bottom: var(--space-6);
}

.mt-4 {
  margin-top: var(--space-4);
}

.mt-6 {
  margin-top: var(--space-6);
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}