/* ==========================================================================
   TABLA DE CONTENIDOS
   ==========================================================================
   1. LAYOUT GENERAL Y UTILIDADES
      - Clases de visibilidad
      - Estructura base (html, body, #app, header, main, footer)
      - Animaciones

   2. PÁGINA DE LOGIN
      - Contenedor y tarjeta de login

   3. COMPONENTES
      - Botones (Warning, Info, Secundarios de Login)
      - Tablas (Contenedor, Semáforo, Ordenación, Hover de celdas)
      - Pestañas de Hojas (Nav-Tabs)
      - Modales, Notificaciones y Overlays (Modals, Toasts, Error/Loading)
      - Formularios y Elementos Específicos
      - Gráfico de Notas
      - Estados Vacíos (Empty States)

   4. TEMA OSCURO (DARK THEME)
      - Paleta de colores
      - Sobreescritura de estilos generales
      - Sobreescritura de componentes específicos

   5. ESTILOS RESPONSIVOS
      - Media Query para Tablets (<= 992px)
      - Media Query para Móviles (<= 767px)
   ========================================================================== */

/* ==========================================================================
   1. LAYOUT GENERAL Y UTILIDADES
   ========================================================================== */

/* --- Clases de visibilidad --- */
.d-none {
  display: none !important;
}
.d-flex {
  display: flex !important;
}
.d-block {
  display: block !important;
}
#login-container.d-none {
  display: none !important;
}
#app.d-block {
  display: block !important;
}

/* --- Estructura base --- */
html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background-color: #f8f9fa;
  transition: all 0.3s ease;
}

#app {
  display: flex;
  flex-direction: column;
  flex-grow: 1;
  width: 100%;
  animation: fadeInApp 0.5s ease-in-out;
}

#app header,
#app footer {
  flex-shrink: 0 !important;
  z-index: 1000 !important;
}

#app main {
  flex-grow: 1;
  overflow-y: auto;
  min-height: 0;
  padding: 1.5rem;

  /* --- Ocultar la barra de scroll --- */
  scrollbar-width: none;
  -ms-overflow-style: none;
}

#app main::-webkit-scrollbar {
  display: none;
}

/* --- Animaciones --- */
.fade-in {
  animation: fadeIn 0.5s ease-in !important;
}

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

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

@keyframes slideInRight {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

/* ==========================================================================
   2. PÁGINA DE LOGIN
   ========================================================================== */
.login-container {
  width: 100%;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  padding: 1rem;
}

.login-card {
  width: 400px;
}

/* ===== ESTILO PERSONALIZADO PARA BOTONES SECUNDARIOS DEL LOGIN ===== */
#login-container #register-btn,
#login-container #back-to-login {
  color: #0dcaf0;
  border-color: #0dcaf0;
  transition: all 0.2s ease-in-out;
}
#login-container #register-btn:hover,
#login-container #back-to-login:hover {
  color: #ffffff;
  background-color: #0dcaf0;
}

/* ==========================================================================
   3. COMPONENTES
   ========================================================================== */

/* --- Botones --- */
.btn-warning,
.btn-info {
  color: white !important;
  transition: background-color 0.2s ease-in-out, border-color 0.2s ease-in-out;
}
.btn-warning:hover {
  background-color: #e0a800 !important;
  border-color: #d39e00 !important;
}
.btn-info:hover {
  background-color: #0baccb !important;
  border-color: #0aa3c2 !important;
}
.btn-warning:active {
  background-color: #c69500 !important;
  border-color: #b98b00 !important;
}
.btn-info:active {
  background-color: #0a9cb9 !important;
  border-color: #0992ad !important;
}

/* --- Tablas y Elementos Relacionados --- */
.main-controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}
.search-box {
  width: 250px;
}
.table-container {
  flex-grow: 1;
  overflow-y: auto;
}
thead.sticky-top th {
  position: sticky !important;
  top: 0 !important;
  z-index: 2 !important;
}

/* Semáforo de rendimiento (Tema Claro) */
.table tbody tr.tr-rojo td {
  background-color: #f8d7da !important;
}
.table tbody tr.tr-amarillo td {
  background-color: #fff3cd !important;
}
.table tbody tr.tr-verde td {
  background-color: #d4edda !important;
}

/* Ordenación de columnas */
#studentsTable thead th[data-col] {
  cursor: pointer;
  user-select: none;
  position: relative;
  padding-right: 25px !important;
}
#studentsTable thead th[data-col]:not(.sort-asc):not(.sort-desc) {
  text-align: center;
  padding-left: 15px;
}
#studentsTable thead th[data-col]:hover {
  background-color: #4c4c4d !important;
}
#studentsTable thead th.sort-asc::after,
#studentsTable thead th.sort-desc::after {
  content: "";
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  width: 0;
  height: 0;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
}
#studentsTable thead th.sort-asc::after {
  border-bottom: 5px solid currentColor;
}
#studentsTable thead th.sort-desc::after {
  border-top: 5px solid currentColor;
}

/* Indicador visual para columnas ordenables (cuando no están activas) */
#studentsTable thead th[data-col]:not(.sort-asc):not(.sort-desc)::before {
  content: "↕";
  position: absolute;
  right: 15px;
  top: 49%;
  transform: translateY(-50%);
  font-size: 0.8em;
  opacity: 0.4;
  transition: opacity 0.2s ease;
}

/* Efecto hover para el indicador visual */
#studentsTable thead th[data-col]:not(.sort-asc):not(.sort-desc):hover::before {
  opacity: 0.8;
}

/* Hover en celda de notas */
#studentsTable tbody tr td:nth-child(2) {
  cursor: pointer;
  transition: background-color 0.2s ease;
}
#studentsTable tbody tr td:nth-child(2):hover {
  background-color: rgba(0, 123, 255, 0.1) !important;
}

/* --- Pestañas de Hojas (Nav-Tabs) --- */
.sheet-delete {
  cursor: pointer !important;
  opacity: 0.7 !important;
  transition: opacity 0.2s !important;
}
.sheet-delete:hover {
  opacity: 1 !important;
}
.nav-tabs .nav-link.active {
  font-weight: bold !important;
}

/* --- Modales, Notificaciones y Overlays --- */
.modal-header {
  border-bottom: none !important;
}
.modal-footer {
  border-top: none !important;
}

#toast-container {
  position: fixed !important;
  bottom: 20px !important;
  right: 20px !important;
  z-index: 9999 !important;
  max-width: 400px !important;
}
#toast-container .alert {
  min-width: 300px !important;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15) !important;
  border: none !important;
  color: white !important;
  animation: slideInRight 0.3s ease-out !important;
}
#toast-container .alert-success {
  background-color: #198754 !important;
}
#toast-container .alert-danger,
#toast-container .alert-error {
  background-color: #dc3545 !important;
}
#toast-container .alert-warning {
  background-color: #ffc107 !important;
  color: #000 !important;
}
#toast-container .alert-info {
  background-color: #0dcaf0 !important;
}
#toast-container .btn-close {
  filter: invert(1) !important;
}
#toast-container .alert-warning .btn-close {
  filter: invert(0) !important;
}

.error-container,
.loading-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(255, 255, 255, 0.95);
  z-index: 9999;
  display: none;
}
.error-state,
.loading-state {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: white;
  padding: 2rem;
  border-radius: 10px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  max-width: 400px;
  width: 90%;
}
.error-icon {
  font-size: 4rem;
}

/* --- Formularios y Elementos Específicos --- */
.input-group .form-control.note-input {
  border-right: none !important;
}
.input-group .btn-outline-danger {
  border-left: none !important;
  border-color: #ced4da !important;
}
.input-group .btn-outline-danger:hover {
  background-color: #dc3545 !important;
  border-color: #dc3545 !important;
  color: white !important;
}
.attendance-option {
  margin: 0 5px;
}
.duplicate-warning {
  color: #856404;
  background-color: #fff3cd;
  border: 1px solid #ffeaa7;
  border-radius: 0.375rem;
  padding: 0.75rem;
  margin-top: 0.5rem;
  font-size: 0.875rem;
}

/* --- Gráfico de Notas --- */
.chart-container {
  background: white;
  border-radius: 8px;
  padding: 15px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}
#chartAverage,
#chartTotalNotes,
#chartTrend {
  font-size: 1.1rem !important;
  padding: 0.5rem 1rem !important;
}

/* --- Estados Vacíos (Empty States) --- */
.empty-state {
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: #6c757d;
  padding: 3rem 1rem;
}

/* ==========================================================================
   4. TEMA OSCURO (DARK THEME)
   ========================================================================== */
.dark-theme {
  --main-bg: #1a202c;
  --surface-bg: #2d3748;
  --hover-bg: #4a5568;
  --border-color: #4a5568;
  --main-text: #ffffff;
  --muted-text: #a0aec0;
  --red-bg: #4a2427;
  --red-text: #fed7d7;
  --yellow-bg: #4a3a19;
  --yellow-text: #feebc8;
  --green-bg: #234a34;
  --green-text: #c6f6d5;
}

.dark-theme {
  background-color: var(--main-bg) !important;
  color: var(--main-text) !important;
}
.dark-theme .table {
  color: var(--main-text) !important;
}
.dark-theme .table-dark {
  background-color: var(--hover-bg) !important;
}
.dark-theme .modal-content,
.dark-theme .card,
.dark-theme .chart-container {
  background-color: var(--surface-bg) !important;
  color: var(--main-text) !important;
  border-color: var(--border-color) !important;
}
.dark-theme .form-control,
.dark-theme .form-select {
  background-color: var(--hover-bg) !important;
  border-color: #718096 !important;
  color: var(--main-text) !important;
}
.dark-theme .form-control:focus,
.dark-theme .form-select:focus {
  background-color: var(--hover-bg) !important;
  border-color: #4299e1 !important;
  box-shadow: 0 0 0 0.2rem rgba(66, 153, 225, 0.25) !important;
}
.dark-theme .bg-light {
  background-color: var(--surface-bg) !important;
  color: var(--main-text) !important;
}

/* Semáforo en tema oscuro */
.dark-theme .table tbody tr.tr-rojo td {
  background-color: var(--red-bg) !important;
  color: var(--red-text) !important;
}
.dark-theme .table tbody tr.tr-amarillo td {
  background-color: var(--yellow-bg) !important;
  color: var(--yellow-text) !important;
}
.dark-theme .table tbody tr.tr-verde td {
  background-color: var(--green-bg) !important;
  color: var(--green-text) !important;
}

/* Overlays en tema oscuro */
.dark-theme .error-container,
.dark-theme .loading-container {
  background: rgba(26, 32, 44, 0.95);
}
.dark-theme .error-state,
.dark-theme .loading-state {
  background: var(--surface-bg);
  color: var(--main-text);
}

/* Placeholders en tema oscuro */
.dark-theme .form-control::placeholder,
.dark-theme .form-select::placeholder {
  color: rgb(255, 255, 255, 0.8) !important;
  opacity: 1;
}
.dark-theme .form-control::-webkit-input-placeholder {
  color: rgb(255, 255, 255, 0.8) !important;
}
.dark-theme .form-control:-ms-input-placeholder {
  color: rgba(255, 255, 255, 0.8) !important;
}

/* Tablas en tema oscuro */
.dark-theme #studentsTable thead th[data-col]:hover {
  background-color: rgba(255, 255, 255, 0.1) !important;
}
.dark-theme #studentsTable thead.sticky-top th {
  border-bottom: 2px solid var(--hover-bg) !important;
}
.dark-theme
  #studentsTable
  tbody
  tr:not(.tr-rojo):not(.tr-amarillo):not(.tr-verde)
  td {
  background-color: var(--surface-bg) !important;
  color: var(--main-text) !important;
}
.dark-theme
  #studentsTable.table-hover
  > tbody
  > tr:not(.tr-rojo):not(.tr-amarillo):not(.tr-verde):hover
  td {
  background-color: var(--hover-bg) !important;
}
.dark-theme #attendanceTable tbody td {
  background-color: var(--surface-bg) !important;
  color: var(--main-text) !important;
}
.dark-theme #studentsTable tbody tr td:nth-child(2):hover {
  background-color: rgba(66, 153, 225, 0.2) !important;
}

/* Pestañas en tema oscuro */
.dark-theme .nav-tabs {
  border-bottom-color: var(--hover-bg);
}
.dark-theme .nav-tabs .nav-link:not(.active) {
  border-color: transparent;
  color: var(--muted-text);
}
.dark-theme .nav-tabs .nav-link:not(.active):hover {
  background-color: var(--hover-bg);
  color: var(--main-text);
}
.dark-theme .nav-tabs .nav-link.active {
  color: var(--main-text);
  background-color: var(--surface-bg);
  border-color: var(--hover-bg) var(--hover-bg) var(--surface-bg);
}

/* Login en tema oscuro */
.dark-theme #login-container .card .text-primary {
  color: rgb(241 247 255) !important;
}
.dark-theme #login-container .card .text-muted {
  color: var(--muted-text) !important;
}
.dark-theme #login-container #register-btn,
.dark-theme #login-container #back-to-login {
  color: #0dcaf0;
  border-color: #0dcaf0;
}
.dark-theme #login-container #register-btn:hover,
.dark-theme #login-container #back-to-login:hover {
  color: #ffffff;
  background-color: #0dcaf0;
}

/* Empty States en tema oscuro */
.dark-theme .empty-state .text-muted {
  color: rgb(205 219 233) !important;
}

/* ==========================================================================
   5. ESTILOS RESPONSIVOS
   ========================================================================== */

/* --- TABLET (hasta 992px) --- */
@media (max-width: 992px) {
  #app main {
    padding: 1rem;
  }
  .main-controls {
    flex-direction: column;
    align-items: stretch;
  }
  .search-box {
    width: 100%;
  }
  #Stats p {
    font-size: 0.95rem; /* Un 12.5% más pequeño que el tamaño normal */
  }
  #studentsTable .btn-sm {
    padding: 0.2rem 0.4rem;
    font-size: 0.8rem;
  }
  #user-info {
    display: none !important;
  }
}

/* --- PANTALLAS INTERMEDIAS --- */
@media (max-width: 888px) {
  /* Ocultar el saludo */

  #studentsTable thead th {
    white-space: nowrap;
  }

  #studentsTable th[data-lang="tableHeaderActions"],
  #studentsTable td:last-child {
    min-width: 75px;
  }
}

/* --- MÓVIL (hasta 767px) --- */
@media (max-width: 767px) {
  /* Layout General */
  #app header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
    padding-top: 1rem !important;
    padding-bottom: 1rem !important;
  }

  /* Ocultar texto en botones */
  #themeToggle span,
  #langToggle span,
  #logout-btn span {
    display: none !important;
  }
  #app header img {
    height: 50px !important;
    margin-right: 0 !important;
  }
  #app header h2 {
    display: none !important;
  }

  /* Tabla */
  .table {
    font-size: 0.7rem;
  }
  .table th,
  .table td {
    padding: 0.5rem 0.25rem;
  }
  #studentsTable .btn-sm {
    padding: 0.15rem 0.35rem;
    font-size: 0.65rem;
  }

  /* --- MÓVIL PEQUEÑO (hasta 510px) --- */
  @media (max-width: 510px) {
    #studentsTable thead th[data-col]:not(.sort-asc):not(.sort-desc)::before {
      display: none !important;
    }

    #studentsTable thead th {
      font-size: 0.5rem;
    }
    #studentsTable tbody td {
      font-size: 0.6rem;
    }
    #studentsTable .btn-sm {
      padding: 0.2rem 0.4rem;
      font-size: 0.5rem;
    }

    .table {
      font-size: 0.8rem;
    }
  }
}