@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* ==========================================================================
   VARIABLES Y TEMA
   ========================================================================== */
:root {
  /* Paleta principal (Light Mode) */
  --color-primary: #4f46e5;
  --color-primary-hover: #4338ca;
  --color-bg: #f1f5f9;
  --color-surface: #ffffff;
  --color-text-primary: #1e293b;
  --color-text-secondary: #64748b;
  --color-border: #e2e8f0;
  
  /* Estados / Semántica */
  --color-success: #10b981;
  --color-success-bg: rgba(16, 185, 129, 0.1);
  --color-danger: #ef4444;
  --color-danger-bg: rgba(239, 68, 68, 0.1);
  --color-warning: #f59e0b;
  --color-warning-bg: rgba(245, 158, 11, 0.1);
  --color-info: #3b82f6;
  --color-info-bg: rgba(59, 130, 246, 0.1);
  
  /* Sombras y Radios */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-full: 9999px;
  
  /* Transiciones */
  --transition: all 0.3s ease;
}

body.dark-mode {
  /* Paleta Oscura (Dark Mode) */
  --color-bg: #0f172a;
  --color-surface: #1e293b;
  --color-text-primary: #f8fafc;
  --color-text-secondary: #94a3b8;
  --color-border: #334155;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
}

/* ==========================================================================
   RESETEO BASE
   ========================================================================== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  transition: background-color var(--transition), color var(--transition);
}

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

button {
  cursor: pointer;
  font-family: inherit;
  border: none;
  background: none;
}

/* Scrollbar personalizado */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}
::-webkit-scrollbar-track {
  background: var(--color-bg);
}
::-webkit-scrollbar-thumb {
  background: var(--color-text-secondary);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-primary);
}

/* ==========================================================================
   TIPOGRAFÍA
   ========================================================================== */
h1, h2, h3, h4, h5, h6 {
  color: var(--color-text-primary);
  font-weight: 600;
  line-height: 1.2;
}

/* ==========================================================================
   COMPONENTES: BOTONES
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius-md);
  transition: var(--transition);
  gap: 0.5rem;
}

.btn-primary {
  background-color: var(--color-primary);
  color: white;
}
.btn-primary:hover {
  background-color: var(--color-primary-hover);
  transform: translateY(-1px);
}

.btn-success {
  background-color: var(--color-success);
  color: white;
}
.btn-success:hover { background-color: #059669; }

.btn-danger {
  background-color: var(--color-danger);
  color: white;
}
.btn-danger:hover { background-color: #dc2626; }

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

.btn-outline {
  background-color: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
}
.btn-outline:hover {
  background-color: var(--color-bg);
  border-color: var(--color-text-secondary);
}

.btn-sm {
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
}

.btn-icon {
  padding: 0.5rem;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.btn-icon:hover {
  background-color: var(--color-bg);
}

/* ==========================================================================
   COMPONENTES: FORMULARIOS
   ========================================================================== */
.form-group {
  margin-bottom: 1rem;
  width: 100%;
}

.form-row {
  display: flex;
  gap: 1rem;
}
.form-row .form-group {
  flex: 1;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: var(--color-text-secondary);
}

.form-input, .form-select {
  width: 100%;
  padding: 0.5rem 0.75rem;
  font-size: 0.875rem;
  font-family: inherit;
  color: var(--color-text-primary);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.form-input:focus, .form-select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 2px rgba(79, 70, 229, 0.2);
}

.form-input::placeholder {
  color: var(--color-text-secondary);
  opacity: 0.5;
}

/* ==========================================================================
   LOGIN
   ========================================================================== */
#login-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 1rem;
  background: linear-gradient(135deg, var(--color-primary) 0%, #312e81 100%);
}

.login-card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  width: 100%;
  max-width: 400px;
  box-shadow: var(--shadow-lg);
}

.login-header {
  text-align: center;
  margin-bottom: 2rem;
}

.login-header h1 {
  font-size: 1.5rem;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.login-header p {
  color: var(--color-text-secondary);
  font-size: 0.875rem;
}

.login-card .btn {
  width: 100%;
  margin-top: 1rem;
  padding: 0.75rem;
}

/* Animación de error (shake) */
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
  20%, 40%, 60%, 80% { transform: translateX(5px); }
}
.shake {
  animation: shake 0.5s;
}

/* ==========================================================================
   LAYOUT PRINCIPAL
   ========================================================================== */
#app-container {
  display: none; /* Oculto inicialmente, manejado por JS */
  height: 100vh;
  overflow: hidden;
}

/* SIDEBAR */
.sidebar {
  width: 250px;
  background-color: var(--color-surface);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  transition: transform 0.3s ease;
  z-index: 40;
}

.sidebar-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 600;
  font-size: 1.25rem;
  color: var(--color-primary);
}

.sidebar-nav {
  flex: 1;
  padding: 1rem 0;
  overflow-y: auto;
}

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1.5rem;
  color: var(--color-text-secondary);
  transition: var(--transition);
  font-weight: 500;
}

.sidebar-link:hover {
  background-color: var(--color-bg);
  color: var(--color-text-primary);
}

.sidebar-link.active {
  background-color: var(--color-primary-hover);
  color: white;
  border-left: 4px solid var(--color-primary);
}

/* CONTENIDO PRINCIPAL */
.main-wrapper {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.top-bar {
  height: 64px;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.5rem;
  z-index: 30;
}

.top-bar-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

#btn-toggle-sidebar {
  display: none;
  font-size: 1.25rem;
}

.user-info {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.user-avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background-color: var(--color-primary);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 0.875rem;
}

.user-details {
  display: flex;
  flex-direction: column;
}

#user-display-name {
  font-weight: 600;
  font-size: 0.875rem;
}

#user-display-role {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
  text-transform: capitalize;
}

.main-content {
  flex: 1;
  overflow-y: auto;
  padding: 1.5rem;
}

/* VISTAS */
.view {
  display: none;
  animation: fadeIn 0.3s ease;
}

.view.active {
  display: block;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.page-title {
  font-size: 1.5rem;
  font-weight: 600;
}

/* ==========================================================================
   DASHBOARD STATS
   ========================================================================== */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}

.stat-card {
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.stat-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.stat-info {
  display: flex;
  flex-direction: column;
}

.stat-value {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-text-primary);
}

.stat-label {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}

/* Actividad Reciente */
.actividad-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: 1rem;
  border-radius: var(--radius-md);
  margin-bottom: 0.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.actividad-info {
  display: flex;
  flex-direction: column;
}
.actividad-fecha {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
}

.actividad-stats {
  display: flex;
  align-items: center;
  gap: 1rem;
  width: 150px;
}

.progress-bar-container {
  flex: 1;
  height: 8px;
  background-color: var(--color-bg);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  border-radius: var(--radius-full);
}

/* ==========================================================================
   TABLAS DE DATOS
   ========================================================================== */
.table-container {
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  overflow-x: auto;
}

.filter-bar {
  padding: 1rem;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  gap: 1rem;
  align-items: center;
  background-color: var(--color-surface);
  flex-wrap: wrap;
}

.search-box {
  flex: 1;
  min-width: 200px;
}

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

.data-table th, .data-table td {
  padding: 1rem;
  border-bottom: 1px solid var(--color-border);
}

.data-table th {
  background-color: rgba(0,0,0,0.02);
  font-weight: 600;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.dark-mode .data-table th {
  background-color: rgba(255,255,255,0.02);
}

.data-table tbody tr {
  transition: var(--transition);
}

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

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

.th-acciones, .td-acciones {
  width: 100px;
  text-align: right;
  white-space: nowrap;
}

.empty-state {
  padding: 3rem;
  text-align: center;
  color: var(--color-text-secondary);
}

.empty-state-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.5;
}

/* ==========================================================================
   BADGES
   ========================================================================== */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1;
}

.badge-curso {
  background-color: var(--color-bg);
  border: 1px solid var(--color-border);
  color: var(--color-text-primary);
}

.badge-presente { background-color: var(--color-success-bg); color: var(--color-success); }
.badge-ausente { background-color: var(--color-danger-bg); color: var(--color-danger); }
.badge-tarde { background-color: var(--color-warning-bg); color: var(--color-warning); }
.badge-justificado { background-color: var(--color-info-bg); color: var(--color-info); }

/* ==========================================================================
   GRILLA DE ASISTENCIA
   ========================================================================== */
.attendance-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
  padding: 1rem;
}

.attendance-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1rem;
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.attendance-card-name {
  font-weight: 600;
}

.attendance-card-curso {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
}

.attendance-buttons {
  display: flex;
  gap: 0.25rem;
}

.attendance-status-btn {
  flex: 1;
  padding: 0.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition: var(--transition);
  color: var(--color-text-secondary);
}

.attendance-status-btn:hover {
  background-color: var(--color-bg);
}

/* Estados Activos en Grilla */
.attendance-status-btn.active.presente {
  background-color: var(--color-success);
  border-color: var(--color-success);
  color: white;
}

.attendance-status-btn.active.ausente {
  background-color: var(--color-danger);
  border-color: var(--color-danger);
  color: white;
}

.attendance-status-btn.active.tarde {
  background-color: var(--color-warning);
  border-color: var(--color-warning);
  color: white;
}

.attendance-status-btn.active.justificado {
  background-color: var(--color-info);
  border-color: var(--color-info);
  color: white;
}

/* ==========================================================================
   MODALES
   ========================================================================== */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  backdrop-filter: blur(2px);
}

.modal-overlay.visible {
  opacity: 1;
  visibility: visible;
}

.modal {
  background-color: var(--color-surface);
  width: 100%;
  max-width: 500px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  transform: translateY(-20px);
  transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  max-height: 90vh;
  display: flex;
  flex-direction: column;
}

.modal-overlay.visible .modal {
  transform: translateY(0);
}

.modal-header {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-title {
  font-size: 1.25rem;
  margin: 0;
}

.modal-close {
  font-size: 1.5rem;
  color: var(--color-text-secondary);
  line-height: 1;
}
.modal-close:hover {
  color: var(--color-danger);
}

.modal-body {
  padding: 1.5rem;
  overflow-y: auto;
}

.modal-footer {
  padding: 1.25rem 1.5rem;
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: flex-end;
  gap: 1rem;
}

/* Diálogo de confirmación */
.confirm-dialog {
  text-align: center;
  padding: 1rem 0;
}

.confirm-icon {
  font-size: 3rem;
  color: var(--color-warning);
  margin-bottom: 1rem;
}
.confirm-icon.danger {
  color: var(--color-danger);
}

/* ==========================================================================
   TOASTS (Notificaciones)
   ========================================================================== */
.toast {
  position: fixed;
  top: 20px;
  right: 20px;
  background-color: var(--color-surface);
  color: var(--color-text-primary);
  padding: 1rem 1.5rem;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 1rem;
  z-index: 200;
  transform: translateX(120%);
  transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  border-left: 4px solid var(--color-info);
}

.toast.visible {
  transform: translateX(0);
}

.toast-success { border-left-color: var(--color-success); }
.toast-error { border-left-color: var(--color-danger); }
.toast-warning { border-left-color: var(--color-warning); }

.toast-icon {
  font-weight: bold;
  font-size: 1.25rem;
}
.toast-success .toast-icon { color: var(--color-success); }
.toast-error .toast-icon { color: var(--color-danger); }

.toast-close {
  margin-left: auto;
  color: var(--color-text-secondary);
  font-size: 1.25rem;
}

/* ==========================================================================
   RESPONSIVE
   ========================================================================== */
@media (max-width: 768px) {
  #btn-toggle-sidebar {
    display: block;
  }
  
  .sidebar {
    position: fixed;
    height: 100vh;
    left: 0;
    top: 0;
    transform: translateX(-100%);
  }
  
  .sidebar.open {
    transform: translateX(0);
    box-shadow: var(--shadow-lg);
  }
  
  .form-row {
    flex-direction: column;
    gap: 0;
  }
  
  /* Responsive tables */
  .data-table thead {
    display: none;
  }
  
  .data-table, .data-table tbody, .data-table tr, .data-table td {
    display: block;
    width: 100%;
  }
  
  .data-table tr {
    margin-bottom: 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
  }
  
  .data-table td {
    text-align: right;
    padding-left: 50%;
    position: relative;
    border-bottom: 1px solid var(--color-bg);
  }
  
  .data-table td::before {
    content: attr(data-label);
    position: absolute;
    left: 1rem;
    width: 45%;
    text-align: left;
    font-weight: 600;
    color: var(--color-text-secondary);
  }
  
  .th-acciones, .td-acciones {
    text-align: center !important;
    padding-left: 1rem !important;
  }
  .td-acciones::before {
    display: none;
  }
}

/* Spinner de carga */
.spinner-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 3rem;
  color: var(--color-text-secondary);
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-bottom: 1rem;
}

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