/* ============================================================================
   ESTILOS - Finanzas SaaS
   Mobile First + Responsive + Modo Claro/Oscuro
   ============================================================================ */

:root {
  /* Colores */
  --color-primary: #1e40af;
  --color-secondary: #0891b2;
  --color-success: #059669;
  --color-danger: #dc2626;
  --color-warning: #ea580c;
  --color-info: #0284c7;
  --color-light: #f3f4f6;
  --color-dark: #1f2937;
  --color-white: #ffffff;
  --color-text: #111827;
  --color-border: #e5e7eb;
  --color-shadow: rgba(0, 0, 0, 0.1);
  
  /* Espaciado */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  
  /* Tipografía */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-mono: 'Courier New', monospace;
  --font-size-sm: 12px;
  --font-size-base: 14px;
  --font-size-lg: 16px;
  --font-size-xl: 20px;
  --font-size-2xl: 24px;
  --font-size-3xl: 32px;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  
  /* Transiciones */
  --duration-fast: 150ms;
  --duration-base: 300ms;
  --duration-slow: 500ms;
}

/* Dark mode */
@media (prefers-color-scheme: dark) {
  :root {
    --color-text: #f3f4f6;
    --color-dark: #111827;
    --color-light: #1f2937;
    --color-border: #374151;
  }
}

/* ============================================================================
   RESET & BASE
   ============================================================================ */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.5;
  color: var(--color-text);
  background: var(--color-white);
  overflow-x: hidden;
}

/* Modo oscuro */
@media (prefers-color-scheme: dark) {
  body {
    background: var(--color-dark);
  }
}

/* ============================================================================
   TIPOGRAFÍA
   ============================================================================ */

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
}

h1 { font-size: var(--font-size-3xl); }
h2 { font-size: var(--font-size-2xl); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }
h5, h6 { font-size: var(--font-size-base); }

p {
  margin-bottom: var(--spacing-md);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--duration-fast);
}

a:hover {
  color: var(--color-secondary);
  text-decoration: underline;
}

/* ============================================================================
   LAYOUT PRINCIPAL
   ============================================================================ */

.main-content {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.page {
  display: none;
  padding: var(--spacing-md);
  animation: fadeIn var(--duration-base);
}

.page.active {
  display: block;
}

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

/* ============================================================================
   SIDEBAR
   ============================================================================ */

.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: 260px;
  height: 100vh;
  background: var(--color-white);
  border-right: 1px solid var(--color-border);
  overflow-y: auto;
  z-index: 1000;
  transform: translateX(0);
  transition: transform var(--duration-base);
}

.sidebar.hidden {
  transform: translateX(-100%);
}

@media (max-width: 768px) {
  .sidebar {
    box-shadow: 2px 0 4px var(--color-shadow);
  }
}

.sidebar-header {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-primary);
}

.sidebar-toggle {
  display: none;
  background: none;
  border: none;
  font-size: var(--font-size-xl);
  cursor: pointer;
}

@media (max-width: 768px) {
  .sidebar-toggle {
    display: block;
  }
}

.user-section {
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  gap: var(--spacing-md);
}

.user-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  flex-shrink: 0;
}

.user-info {
  flex: 1;
  min-width: 0;
}

.user-name {
  font-weight: 600;
  margin: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.company-name {
  font-size: var(--font-size-sm);
  color: #6b7280;
  margin: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.nav-menu {
  list-style: none;
  padding: var(--spacing-md) 0;
}

.nav-link {
  display: block;
  padding: var(--spacing-md) var(--spacing-lg);
  color: var(--color-text);
  transition: background var(--duration-fast);
}

.nav-link:hover {
  background: var(--color-light);
  text-decoration: none;
}

.nav-link.active {
  background: var(--color-primary);
  color: var(--color-white);
}

.sidebar-footer {
  padding: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
  position: sticky;
  bottom: 0;
}

.btn-logout {
  width: 100%;
  padding: var(--spacing-md);
  background: var(--color-danger);
  color: var(--color-white);
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: 600;
  cursor: pointer;
  transition: background var(--duration-fast);
}

.btn-logout:hover {
  background: #b91c1c;
}

@media (min-width: 769px) {
  body {
    margin-left: 260px;
  }
  
  .main-content {
    margin-left: -260px;
    padding-left: 260px;
  }
  
  .btn-sidebar-toggle {
    display: none !important;
  }
}

/* ============================================================================
   PÁGINA: LOGIN
   ============================================================================ */

.login-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: var(--spacing-md);
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
}

.login-box {
  background: var(--color-white);
  border-radius: var(--radius-xl);
  padding: var(--spacing-2xl);
  box-shadow: 0 10px 40px var(--color-shadow);
  max-width: 400px;
  width: 100%;
}

.login-title {
  text-align: center;
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-md);
}

.login-subtitle {
  text-align: center;
  color: #6b7280;
  margin-bottom: var(--spacing-lg);
}

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

.tab-button {
  padding: var(--spacing-md);
  background: var(--color-light);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--duration-fast);
}

.tab-button.active {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
  animation: slideIn var(--duration-fast);
}

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

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

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-sm);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: inherit;
  transition: border-color var(--duration-fast);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(30, 64, 175, 0.1);
}

.divider {
  text-align: center;
  color: #9ca3af;
  margin: var(--spacing-lg) 0;
  position: relative;
}

.divider::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--color-border);
}

.divider {
  background: var(--color-white);
  padding: 0 var(--spacing-md);
  display: inline-block;
  width: 100%;
}

.login-footer {
  text-align: center;
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-lg);
}

/* ============================================================================
   BOTONES
   ============================================================================ */

.btn {
  display: inline-block;
  padding: var(--spacing-md) var(--spacing-lg);
  border: none;
  border-radius: var(--radius-md);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--duration-fast);
  text-align: center;
  font-family: inherit;
  font-size: var(--font-size-base);
}

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

.btn-primary:hover {
  background: #1e3a8a;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(30, 64, 175, 0.3);
}

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

.btn-secondary:hover {
  background: #e5e7eb;
}

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

.btn-danger:hover {
  background: #b91c1c;
}

.btn-full {
  width: 100%;
}

.btn-oauth {
  width: 100%;
  padding: var(--spacing-md);
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-weight: 600;
  cursor: pointer;
  transition: background var(--duration-fast);
  margin-bottom: var(--spacing-md);
}

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

.btn-small {
  padding: 6px 12px;
  font-size: var(--font-size-sm);
  background: var(--color-primary);
  color: var(--color-white);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
}

.btn-small.danger {
  background: var(--color-danger);
}

/* ============================================================================
   DASHBOARD
   ============================================================================ */

.dashboard-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-xl);
}

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

@media (max-width: 600px) {
  .filter-group {
    grid-template-columns: 1fr;
  }
}

.input-month,
.input-select {
  padding: var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.stat-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  display: flex;
  gap: var(--spacing-md);
  box-shadow: 0 1px 3px var(--color-shadow);
  transition: transform var(--duration-fast);
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 4px 12px var(--color-shadow);
}

.stat-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 32px;
  flex-shrink: 0;
}

.stat-label {
  font-size: var(--font-size-sm);
  color: #6b7280;
  margin: 0;
}

.stat-value {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  margin: 0;
  color: var(--color-text);
}

.charts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.chart-card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: 0 1px 3px var(--color-shadow);
}

.chart-card h3 {
  margin-bottom: var(--spacing-lg);
  font-size: var(--font-size-lg);
}

.chart-card canvas {
  max-width: 100%;
  height: auto;
}

/* ============================================================================
   TABLAS
   ============================================================================ */

.table-responsive {
  overflow-x: auto;
  margin-bottom: var(--spacing-lg);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: 0 1px 3px var(--color-shadow);
  overflow: hidden;
}

.data-table thead {
  background: var(--color-primary);
  color: var(--color-white);
}

.data-table th {
  padding: var(--spacing-md) var(--spacing-lg);
  text-align: left;
  font-weight: 600;
  font-size: var(--font-size-sm);
}

.data-table td {
  padding: var(--spacing-md) var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

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

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

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

.amount-cell {
  color: var(--color-primary);
  font-weight: 600;
  font-family: var(--font-mono);
}

.category-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--radius-md);
  color: var(--color-white);
  font-size: var(--font-size-sm);
  font-weight: 600;
}

.status-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 600;
  background: #fee2e2;
  color: #991b1b;
}

.status-badge.approved {
  background: #dcfce7;
  color: #166534;
}

.status-badge.active {
  background: #dcfce7;
  color: #166534;
}

.status-badge.inactive {
  background: #f3f4f6;
  color: #6b7280;
}

.role-badge {
  display: inline-block;
  padding: 4px 12px;
  background: var(--color-info);
  color: var(--color-white);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
}

.action-buttons {
  display: flex;
  gap: var(--spacing-sm);
}

/* ============================================================================
   MODALES
   ============================================================================ */

.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 2000;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md);
}

.modal.active {
  display: flex;
  animation: fadeIn var(--duration-base);
}

.modal-content {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
  width: 100%;
  max-width: 500px;
  max-height: 90vh;
  overflow-y: auto;
  animation: slideUp var(--duration-base);
}

@keyframes slideUp {
  from {
    transform: translateY(20px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-lg);
  border-bottom: 1px solid var(--color-border);
}

.modal-close {
  background: none;
  border: none;
  font-size: var(--font-size-xl);
  cursor: pointer;
  color: #6b7280;
}

.modal-close:hover {
  color: var(--color-text);
}

.modal-content form {
  padding: var(--spacing-lg);
}

.form-actions {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
}

.form-actions button {
  flex: 1;
}

/* ============================================================================
   NOTIFICACIONES
   ============================================================================ */

.notification-container {
  position: fixed;
  top: var(--spacing-md);
  right: var(--spacing-md);
  z-index: 3000;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.notification {
  background: var(--color-success);
  color: var(--color-white);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-md);
  box-shadow: 0 4px 12px var(--color-shadow);
  animation: slideIn var(--duration-base);
  max-width: 300px;
}

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

.notification-warning {
  background: var(--color-warning);
}

.notification-info {
  background: var(--color-info);
}

.notification-close {
  background: none;
  border: none;
  color: inherit;
  cursor: pointer;
  font-size: var(--font-size-lg);
  padding: 0;
}

/* ============================================================================
   LOADER
   ============================================================================ */

.loader {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 4000;
  align-items: center;
  justify-content: center;
}

.spinner {
  border: 4px solid rgba(255, 255, 255, 0.3);
  border-top-color: var(--color-white);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
}

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

/* ============================================================================
   RESPONSIVE
   ============================================================================ */

@media (max-width: 768px) {
  .page {
    padding: var(--spacing-md);
  }
  
  .sidebar {
    width: 100%;
  }
  
  .dashboard-header {
    flex-direction: column;
    align-items: flex-start;
  }
  
  .stats-grid {
    grid-template-columns: 1fr;
  }
  
  .charts-grid {
    grid-template-columns: 1fr;
  }
  
  .table-responsive {
    font-size: var(--font-size-sm);
  }
  
  .data-table th,
  .data-table td {
    padding: var(--spacing-sm) var(--spacing-md);
  }
  
  .action-buttons {
    flex-direction: column;
  }
  
  .modal-content {
    width: 90vw;
  }
}

@media (max-width: 480px) {
  :root {
    --font-size-base: 13px;
    --font-size-lg: 15px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
  }
  
  .login-box {
    padding: var(--spacing-lg);
  }
  
  .page-header {
    flex-direction: column;
    gap: var(--spacing-md);
  }
  
  .tab-group {
    gap: 4px;
  }
}

/* ============================================================================
   DARK MODE SUPPORT
   ============================================================================ */

@media (prefers-color-scheme: dark) {
  .sidebar,
  .login-box,
  .stat-card,
  .chart-card,
  .data-table,
  .modal-content {
    background: #1f2937;
  }
  
  .data-table {
    background: #111827;
  }
  
  .data-table thead {
    background: #0f172a;
  }
  
  .data-table tr:hover {
    background: #374151;
  }
  
  .nav-link:hover {
    background: #374151;
  }
}

/* ============================================================================
   ACCESIBILIDAD
   ============================================================================ */

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus visible para navegación por teclado */
button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* Print styles */
@media print {
  .sidebar,
  .btn-sidebar-toggle,
  .action-buttons {
    display: none !important;
  }
  
  .main-content {
    margin-left: 0;
  }
}

/* PayPal Integration Styles */
.payment-options {
  margin-top: 2rem;
  padding: 2rem;
  background: #f9fafb;
  border-radius: 12px;
}

.payment-options h3 {
  color: #1e40af;
  margin-bottom: 1.5rem;
  font-size: 1.3em;
}

.payment-method {
  background: white;
  padding: 1.5rem;
  border-radius: 8px;
  margin-bottom: 1.5rem;
  border: 2px solid #e5e7eb;
  transition: all 0.3s ease;
}

.payment-method:hover {
  border-color: #1e40af;
  box-shadow: 0 4px 12px rgba(30,64,175,0.1);
}

.payment-method h4 {
  color: #1e40af;
  margin-bottom: 0.5rem;
  font-size: 1.1em;
}

.payment-method p {
  color: #6b7280;
  margin-bottom: 1rem;
  font-size: 0.95em;
}

#paypal-button-container {
  margin-top: 1rem;
}

.btn-secondary {
  background: #6b7280;
  color: white;
  padding: 10px 20px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.95em;
  transition: background 0.3s ease;
}

.btn-secondary:hover {
  background: #4b5563;
}