/* ==========================================================================
   SISTEMA DE GESTIÓN DE NOTAS (SGN) - ESTILOS PRINCIPALES
   Tema: Blanco brillante con detalles en Azul Real & Naval (Modern Web UI)
   ========================================================================== */

:root {
  --primary-blue: #2563eb;
  --primary-hover: #1d4ed8;
  --dark-blue: #0f172a;
  --navy-blue: #1e3a8a;
  --light-blue-bg: #eff6ff;
  --light-blue-border: #bfdbfe;
  --accent-blue: #3b82f6;
  
  --bg-main: #f8fafc;
  --card-bg: #ffffff;
  --text-main: #1e293b;
  --text-muted: #64748b;
  
  --grade-excellent: #16a34a;
  --grade-excellent-bg: #dcfce7;
  --grade-good: #2563eb;
  --grade-good-bg: #dbeafe;
  --grade-regular: #d97706;
  --grade-regular-bg: #fef3c7;
  --grade-fail: #dc2626;
  --grade-fail-bg: #fee2e2;

  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 4px 14px -1px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 10px 25px -3px rgba(15, 23, 42, 0.12);
  --radius-lg: 1rem;
  --radius-md: 0.625rem;
}

body {
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background-color: var(--bg-main);
  color: var(--text-main);
  min-height: 100vh;
  margin: 0;
  display: flex;
  flex-direction: column;
}

/* ==================== HEADER & NAVBAR ==================== */
.sgn-navbar {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 2px solid var(--light-blue-border);
  box-shadow: var(--shadow-sm);
  padding: 0.75rem 1.5rem;
  position: sticky;
  top: 0;
  z-index: 1030;
}

.brand-logo-img {
  height: 48px;
  object-fit: contain;
  transition: transform 0.2s ease;
}

.brand-logo-img:hover {
  transform: scale(1.03);
}

.sgn-brand-title {
  font-weight: 800;
  color: var(--navy-blue);
  letter-spacing: -0.5px;
}

.sgn-brand-subtitle {
  font-size: 0.75rem;
  color: var(--primary-blue);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* ==================== NAV PILLS DISCRETAS Y OPTIMIZADAS ==================== */
.sgn-nav-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  background-color: #ffffff;
  padding: 0.35rem !important;
}

.sgn-nav-link {
  font-size: 0.85rem !important;
  font-weight: 600 !important;
  padding: 0.45rem 0.9rem !important;
  color: #475569 !important;
  border-radius: var(--radius-md) !important;
  transition: all 0.2s ease-in-out !important;
  white-space: nowrap;
  background: transparent;
}

.sgn-nav-link:hover {
  color: var(--primary-blue) !important;
  background-color: var(--light-blue-bg) !important;
}

.sgn-nav-link.active {
  background-color: var(--primary-blue) !important;
  color: #ffffff !important;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25) !important;
}

/* ==================== CARDS & CONTAINERS ==================== */
.card-custom {
  background-color: var(--card-bg);
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: all 0.25s ease;
}

.card-custom:hover {
  box-shadow: var(--shadow-lg);
}

.card-header-blue {
  background: linear-gradient(135deg, var(--navy-blue), var(--primary-blue));
  color: #ffffff;
  border-top-left-radius: calc(var(--radius-lg) - 1px);
  border-top-right-radius: calc(var(--radius-lg) - 1px);
  padding: 1.25rem 1.5rem;
}

/* ==================== SEARCH BAR ==================== */
.search-box-group {
  position: relative;
}

.search-box-group > i {
  position: absolute;
  left: 1.25rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--primary-blue);
  font-size: 1.1rem;
}

.search-box-input {
  padding-left: 3rem !important;
  border-radius: 50rem !important;
  border: 2px solid var(--light-blue-border);
  font-size: 1.05rem;
  box-shadow: var(--shadow-sm);
  transition: all 0.2s ease;
}

.search-box-input:focus {
  border-color: var(--primary-blue);
  box-shadow: 0 0 0 0.25rem rgba(37, 99, 235, 0.2);
}

/* ==================== BADGES & CALIFICACIONES ==================== */
.grade-badge {
  font-weight: 700;
  padding: 0.4rem 0.85rem;
  border-radius: 50rem;
  display: inline-block;
  font-size: 0.95rem;
  box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}

.grade-excellent {
  background-color: var(--grade-excellent-bg);
  color: var(--grade-excellent);
  border: 1px solid #bbf7d0;
}

.grade-good {
  background-color: var(--grade-good-bg);
  color: var(--grade-good);
  border: 1px solid #bfdbfe;
}

.grade-regular {
  background-color: var(--grade-regular-bg);
  color: var(--grade-regular);
  border: 1px solid #fde68a;
}

.grade-fail {
  background-color: var(--grade-fail-bg);
  color: var(--grade-fail);
  border: 1px solid #fecaca;
}

.role-badge {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  padding: 0.3rem 0.6rem;
  border-radius: 0.375rem;
}

.role-super-admin {
  background-color: #f3e8ff;
  color: #6b21a8;
  border: 1px solid #e9d5ff;
}

.role-docente {
  background-color: var(--light-blue-bg);
  color: var(--navy-blue);
  border: 1px solid var(--light-blue-border);
}

.role-vocero {
  background-color: #fef3c7;
  color: #92400e;
  border: 1px solid #fde68a;
}

.role-estudiante {
  background-color: #f1f5f9;
  color: #475569;
  border: 1px solid #e2e8f0;
}

/* ==================== TABLAS MODERNAS ==================== */
.sgn-table {
  border-collapse: separate;
  border-spacing: 0;
  width: 100%;
}

.sgn-table th {
  background-color: #f1f5f9;
  color: var(--navy-blue);
  font-weight: 700;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 1rem;
  border-bottom: 2px solid var(--light-blue-border);
}

.sgn-table td {
  padding: 0.9rem 1rem;
  vertical-align: middle;
  border-bottom: 1px solid #e2e8f0;
  background-color: #ffffff;
  transition: background-color 0.15s ease;
}

.sgn-table tbody tr:hover td {
  background-color: var(--light-blue-bg);
}

.empty-table-row {
  text-align: center !important;
  padding: 2.5rem 1rem !important;
  color: var(--text-muted) !important;
  font-weight: 500 !important;
  background-color: #f8fafc !important;
}

.empty-table-row i {
  color: var(--primary-blue);
  opacity: 0.5;
  display: block;
  font-size: 2.2rem;
  margin-bottom: 0.6rem;
}

/* ==================== MODALES MODERNOS ==================== */
.modal-content {
  border-radius: var(--radius-lg);
  border: 1px solid var(--light-blue-border);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.modal-header-blue {
  background: linear-gradient(135deg, var(--navy-blue), var(--primary-blue));
  color: #ffffff;
}

.modal-header-blue .btn-close {
  filter: brightness(0) invert(1);
}

/* ==================== BOTONES ==================== */
.btn-primary-sgn {
  background-color: var(--primary-blue);
  border-color: var(--primary-blue);
  color: #ffffff;
  font-weight: 600;
  border-radius: var(--radius-md);
  padding: 0.6rem 1.25rem;
  transition: all 0.2s ease;
}

.btn-primary-sgn:hover {
  background-color: var(--primary-hover);
  border-color: var(--primary-hover);
  color: #ffffff;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.btn-outline-sgn {
  color: var(--primary-blue);
  border: 2px solid var(--primary-blue);
  background-color: transparent;
  font-weight: 600;
  border-radius: var(--radius-md);
}

.btn-outline-sgn:hover {
  background-color: var(--primary-blue);
  color: #ffffff;
}

/* ==================== FOOTER ==================== */
.sgn-footer {
  margin-top: auto;
  background-color: #ffffff;
  border-top: 1px solid #e2e8f0;
  padding: 1.5rem 0;
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* Spinners */
.spinner-blue {
  color: var(--primary-blue);
}

.bg-navy {
  background-color: var(--navy-blue) !important;
  color: #ffffff;
}

.text-navy {
  color: var(--navy-blue) !important;
}

.badge.bg-light.text-dark,
.badge.bg-white.text-dark {
  color: #000000 !important;
}

.max-w-400 {
  max-width: 400px;
}

/* ==================== ENTREGAS DE ESTUDIANTES (CALIFICACIÓN Y ESTADOS) ==================== */
.entrega-row-calificada {
  border-left: 4.5px solid #16a34a !important;
  background-color: #ffffff;
}

.entrega-row-calificada:hover td {
  background-color: #f0fdf4 !important;
}

.entrega-row-pendiente {
  border-left: 4.5px solid #f59e0b !important;
  background-color: #fffdf5 !important;
}

.entrega-row-pendiente td {
  background-color: #fffdf5;
}

.entrega-row-pendiente:hover td {
  background-color: #fef9c3 !important;
}

.entrega-row-modificada {
  border-left: 4.5px solid #2563eb !important;
  background-color: #eff6ff !important;
}

.entrega-row-modificada td {
  background-color: #eff6ff;
}

.entrega-row-modificada:hover td {
  background-color: #dbeafe !important;
}

.input-nota-entrega {
  font-weight: 700 !important;
  text-align: center;
  font-size: 0.95rem;
  border-radius: var(--radius-md) !important;
  border: 1.5px solid #cbd5e1;
  transition: all 0.2s ease-in-out;
}

.input-nota-entrega:focus {
  border-color: var(--primary-blue) !important;
  box-shadow: 0 0 0 0.2rem rgba(37, 99, 235, 0.2) !important;
}

.input-nota-entrega.nota-vacia {
  border-color: #f59e0b;
  background-color: #fffbeb;
}

.input-nota-entrega.nota-lista {
  border-color: #16a34a;
  background-color: #f0fdf4;
}

.badge-status-entrega {
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.35rem 0.65rem;
  border-radius: 50rem;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}

/* Fila de actividad con entregas pendientes por evaluar */
.row-actividad-pendiente {
  background-color: #fffdf5 !important;
  border-left: 4.5px solid #f59e0b !important;
}

.row-actividad-pendiente:hover {
  background-color: #fef9c3 !important;
}

.badge-pendientes-pulse {
  animation: pulse-soft 2s infinite ease-in-out;
}

@keyframes pulse-soft {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}

/* ==================== BLOQUES RESPONSIVOS DE LINKS PUBLICADOS ==================== */
.sgn-link-block {
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
}

.sgn-link-card {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.55rem 0.75rem;
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 0.625rem;
  transition: all 0.2s ease-in-out;
  width: 100%;
  box-sizing: border-box;
  overflow: hidden;
}

.sgn-link-card:hover {
  background: #ffffff;
  border-color: var(--primary-blue);
  box-shadow: 0 3px 10px rgba(37, 99, 235, 0.12);
}

.sgn-link-icon-box {
  width: 36px;
  height: 36px;
  min-width: 36px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.sgn-link-info {
  flex: 1 1 auto;
  min-width: 0; /* Impide que el texto flex desborde */
  overflow: hidden;
}

.sgn-link-url {
  font-size: 0.75rem;
  color: #64748b;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
  display: block;
}

.sgn-link-btn {
  flex-shrink: 0;
  white-space: nowrap;
  font-weight: 600;
  font-size: 0.78rem;
  padding: 0.35rem 0.75rem;
  border-radius: 0.5rem;
}

/* Contenedor de descripción de actividad seguro contra desbordamiento */
.desc-actividad-box {
  overflow-wrap: anywhere;
  word-break: break-word;
  max-width: 100%;
  box-sizing: border-box;
}

.shadow-xs {
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.input-comentario-entrega {
  font-size: 0.85rem;
  border-color: #cbd5e1;
  transition: all 0.2s ease-in-out;
}

.input-comentario-entrega:focus {
  border-color: var(--primary-blue) !important;
  box-shadow: 0 0 0 0.15rem rgba(37, 99, 235, 0.15) !important;
}

.input-est-eval:focus {
  border-color: var(--primary-blue) !important;
  box-shadow: 0 0 0 0.15rem rgba(37, 99, 235, 0.15) !important;
}

#dropdownResultadosEstudianteActividades .list-group-item {
  border-left: 3px solid transparent;
  transition: all 0.15s ease-in-out;
}

#dropdownResultadosEstudianteActividades .list-group-item:hover {
  background-color: #f1f5f9;
  border-left-color: var(--primary-blue);
}

/* ==========================================================================
   SISTEMA DE DISEÑO RESPONSIVO INTEGRAL (MÓVILES, TABLETS & ESCRITORIOS)
   ========================================================================== */

/* 1. Prevención Global contra Desbordamiento Horizontal */
html, body {
  max-width: 100vw;
  overflow-x: hidden;
}

*, *::before, *::after {
  box-sizing: border-box;
}

img, video, canvas, svg {
  max-width: 100%;
  height: auto;
}

/* 2. Scrollbars táctiles optimizados para contenedores desplazables */
.table-responsive {
  width: 100%;
  margin-bottom: 1rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.table-responsive::-webkit-scrollbar {
  height: 6px;
}

.table-responsive::-webkit-scrollbar-track {
  background: #f1f5f9;
  border-radius: 4px;
}

.table-responsive::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 4px;
}

.table-responsive::-webkit-scrollbar-thumb:hover {
  background: #94a3b8;
}

/* 3. Reglas para Pantallas Medianas (Tablets <= 991px) */
@media (max-width: 991px) {
  .sgn-navbar {
    padding: 0.6rem 1rem;
  }
}

/* 4. Reglas Principales para Móviles y Smartphones (<= 768px) */
@media (max-width: 768px) {
  /* Contenedores principales y espacios */
  main.container, main.container-fluid {
    padding-left: 0.75rem !important;
    padding-right: 0.75rem !important;
    padding-top: 1rem !important;
  }

  .card-body {
    padding: 1rem !important;
  }

  .card-header-blue {
    padding: 0.85rem 1rem !important;
  }

  /* Pestañas de navegación con scroll horizontal táctil (Swipeable Pills) */
  .sgn-nav-pills {
    display: flex !important;
    flex-wrap: nowrap !important;
    overflow-x: auto !important;
    -webkit-overflow-scrolling: touch;
    gap: 0.4rem !important;
    padding: 0.4rem 0.5rem !important;
    white-space: nowrap !important;
    border-radius: var(--radius-md) !important;
    scrollbar-width: none; /* Firefox */
  }

  .sgn-nav-pills::-webkit-scrollbar {
    display: none; /* Chrome/Safari */
  }

  .sgn-nav-link {
    flex: 0 0 auto !important;
    font-size: 0.82rem !important;
    padding: 0.45rem 0.8rem !important;
  }

  /* Header y Logo institucional */
  .brand-logo-img {
    height: 40px;
  }

  .sgn-brand-title {
    font-size: 1.15rem !important;
  }

  .sgn-brand-subtitle {
    font-size: 0.65rem !important;
    max-width: 220px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  /* Acciones del encabezado */
  .sgn-header-actions {
    width: 100%;
    display: flex !important;
    flex-wrap: wrap !important;
    gap: 0.35rem !important;
    margin-top: 0.25rem;
  }

  .sgn-header-actions > .btn {
    flex: 1 1 auto;
    font-size: 0.78rem !important;
    padding: 0.35rem 0.55rem !important;
    white-space: nowrap;
    text-align: center;
  }

  /* Grupos de botones que normalmente desbordan en horizontal */
  .btn-group:not(.btn-group-dropdown):not(.dropdown):not(.btn-group-vertical) {
    display: flex !important;
    flex-wrap: wrap !important;
    width: 100% !important;
  }

  .btn-group:not(.btn-group-dropdown):not(.dropdown):not(.btn-group-vertical) > .btn {
    flex: 1 1 auto !important;
    border-radius: var(--radius-md) !important;
    margin: 2px !important;
    font-size: 0.78rem !important;
    padding: 0.4rem 0.6rem !important;
    white-space: normal !important;
    text-align: center !important;
  }

  /* Modales en teléfonos: pantalla completa fluida */
  .modal-dialog {
    margin: 0.5rem auto !important;
    width: calc(100% - 1rem) !important;
    max-width: calc(100% - 1rem) !important;
  }

  .modal-header {
    padding: 0.75rem 1rem !important;
  }

  .modal-body {
    padding: 1rem !important;
    max-height: calc(100vh - 130px);
    overflow-y: auto;
    overflow-x: hidden;
    word-break: break-word;
  }

  .modal-footer {
    padding: 0.75rem 1rem !important;
    flex-direction: column-reverse !important;
    align-items: stretch !important;
    gap: 0.5rem !important;
  }

  .modal-footer > * {
    width: 100% !important;
    margin: 0 !important;
  }

  .modal-footer .d-flex {
    width: 100% !important;
    flex-direction: column !important;
  }

  /* Botones generales: permitir wrap si el texto es extenso */
  .btn-primary-sgn, .btn-outline-sgn, .btn {
    word-break: break-word;
  }

  /* Tarjetas de enlaces adjuntos */
  .sgn-link-card {
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 0.6rem;
  }
  
  .sgn-link-info {
    width: calc(100% - 48px);
  }

  .sgn-link-btn {
    width: 100%;
    text-align: center;
    justify-content: center;
    margin-top: 0.25rem;
  }

  /* Tablas responsivas en móvil */
  .sgn-table th {
    font-size: 0.75rem;
    padding: 0.65rem 0.5rem;
    white-space: nowrap;
  }

  .sgn-table td {
    padding: 0.65rem 0.5rem;
    font-size: 0.85rem;
  }

  .input-nota-entrega {
    font-size: 0.9rem !important;
    padding: 0.25rem 0.4rem !important;
    min-width: 65px;
  }

  .input-comentario-entrega {
    min-width: 140px;
    font-size: 0.8rem !important;
  }
}

/* 5. Reglas para Pantallas Muy Pequeñas (<= 576px / Dispositivos estrechos) */
@media (max-width: 576px) {
  .sgn-brand-subtitle {
    display: none !important;
  }

  .search-box-input {
    padding-left: 2.75rem !important;
    font-size: 0.95rem !important;
  }

  .search-box-group > i {
    left: 1rem;
    font-size: 0.95rem;
  }

  /* Botones de acción en tarjetas de actividades estudiantiles */
  .actividad-action-container {
    flex-direction: column !important;
    align-items: stretch !important;
  }

  .actividad-action-container .btn {
    width: 100% !important;
    margin-bottom: 0.35rem;
  }

  /* Botones de preguntas y opciones del Quiz */
  .quiz-option-card {
    padding: 0.75rem !important;
    min-height: 44px;
    font-size: 0.9rem !important;
  }

  /* Asegurar que las alertas estadísticas de entregas se apilen verticalmente */
  #boxEstadisticasEntregas {
    width: 100%;
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
  }

  #boxEstadisticasEntregas .badge {
    flex: 1 1 auto;
    text-align: center;
  }
}