/* ========================================
   SISTEMA DE CORES E VARIÁVEIS
======================================== */
:root {
  --primary-color: #4F46E5;
  --primary-dark: #4338CA;
  --primary-light: #6366F1;
  --secondary-color: #10B981;
  --secondary-dark: #059669;
  --danger-color: #EF4444;
  --warning-color: #F59E0B;
  --info-color: #3B82F6;
  --dark-color: #1F2937;
  --light-bg: #F9FAFB;
  --white: #FFFFFF;
  --border-color: #E5E7EB;
  --text-primary: #111827;
  --text-secondary: #6B7280;
  --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);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========================================
   ESTILOS GLOBAIS
======================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--light-bg);
  color: var(--text-primary);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   NAVBAR MODERNA
======================================== */
.navbar {
  background: var(--white) !important;
  box-shadow: var(--shadow-md);
  padding: 1rem 0;
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

.navbar-brand {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color) !important;
  letter-spacing: -0.5px;
  transition: var(--transition);
}

.navbar-brand:hover {
  color: var(--primary-dark) !important;
  transform: translateY(-1px);
}

.nav-link {
  color: var(--text-secondary) !important;
  font-weight: 500;
  padding: 0.5rem 1rem !important;
  margin: 0 0.25rem;
  border-radius: var(--radius-md);
  transition: var(--transition);
  position: relative;
}

.nav-link:hover {
  color: var(--primary-color) !important;
  background: rgba(79, 70, 229, 0.05);
}

.nav-link.active {
  color: var(--primary-color) !important;
  background: rgba(79, 70, 229, 0.1);
}

.navbar-text {
  color: var(--text-secondary) !important;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* ========================================
   BOTÕES MODERNOS
======================================== */
.btn {
  font-weight: 600;
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-md);
  border: none;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn:active {
  transform: translateY(0);
}

.btn-primary {
  background: var(--primary-color) !important;
  color: var(--white) !important;
  border: none !important;
}

.btn-primary:hover {
  background: var(--primary-dark) !important;
}

.btn-success {
  background: var(--secondary-color) !important;
  color: var(--white) !important;
}

.btn-success:hover {
  background: var(--secondary-dark) !important;
}

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

.btn-danger:hover {
  background: #DC2626 !important;
}

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

.btn-outline-primary {
  background: transparent !important;
  color: var(--primary-color) !important;
  border: 2px solid var(--primary-color) !important;
}

.btn-outline-primary:hover {
  background: var(--primary-color) !important;
  color: var(--white) !important;
}

.btn-outline-light {
  background: transparent !important;
  color: var(--white) !important;
  border: 2px solid var(--white) !important;
}

.btn-outline-light:hover {
  background: var(--white) !important;
  color: var(--primary-color) !important;
}

.btn-light {
  background: var(--white) !important;
  color: var(--primary-color) !important;
  border: 2px solid var(--white) !important;
}

.btn-light:hover {
  background: transparent !important;
  color: var(--white) !important;
  border-color: var(--white) !important;
}

.btn-sm {
  padding: 0.375rem 0.75rem;
  font-size: 0.875rem;
}

.btn-lg {
  padding: 0.875rem 1.75rem;
  font-size: 1.125rem;
}

/* ========================================
   CARDS MODERNOS
======================================== */
.card {
  background: var(--white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: var(--transition);
  overflow: hidden;
}

.card:hover {
  box-shadow: var(--shadow-xl);
  transform: translateY(-4px);
}

.card-header {
  background: var(--light-bg);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 1.5rem;
  font-weight: 600;
  color: var(--text-primary);
}

.card-body {
  padding: 1.5rem;
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.card-text {
  color: var(--text-secondary);
  line-height: 1.6;
}

/* Cards coloridos */
.card.text-bg-primary {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-light)) !important;
  border: none;
  color: var(--white) !important;
}

.card.text-bg-success {
  background: linear-gradient(135deg, var(--secondary-color), #34D399) !important;
  border: none;
  color: var(--white) !important;
}

.card.text-bg-warning {
  background: linear-gradient(135deg, var(--warning-color), #FBBF24) !important;
  border: none;
  color: var(--white) !important;
}

.card.text-bg-danger {
  background: linear-gradient(135deg, var(--danger-color), #F87171) !important;
  border: none;
  color: var(--white) !important;
}

.card.text-bg-info {
  background: linear-gradient(135deg, var(--info-color), #60A5FA) !important;
  border: none;
  color: var(--white) !important;
}

/* ========================================
   FORMULÁRIOS MODERNOS
======================================== */
.form-label {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.form-control,
.form-select {
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  font-size: 1rem;
  transition: var(--transition);
  background: var(--white);
  color: var(--text-primary);
}

.form-control:focus,
.form-select:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
  outline: none;
}

.form-control::placeholder {
  color: var(--text-secondary);
  opacity: 0.6;
}

/* ========================================
   TABELAS MODERNAS
======================================== */
.table {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.table thead {
  background: var(--light-bg);
  border-bottom: 2px solid var(--border-color);
}

.table thead th {
  font-weight: 700;
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  padding: 1rem;
  border: none;
}

.table tbody tr {
  border-bottom: 1px solid var(--border-color);
  transition: var(--transition);
}

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

.table tbody td {
  padding: 1rem;
  color: var(--text-primary);
  vertical-align: middle;
}

.table-striped tbody tr:nth-of-type(odd) {
  background-color: rgba(249, 250, 251, 0.5);
}

/* ========================================
   ALERTAS E MENSAGENS
======================================== */
.alert {
  border: none;
  border-radius: var(--radius-lg);
  padding: 1rem 1.5rem;
  margin-bottom: 1.5rem;
  border-left: 4px solid;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  box-shadow: var(--shadow-sm);
}

.alert-success {
  background: #D1FAE5;
  color: #065F46;
  border-left-color: var(--secondary-color);
}

.alert-danger {
  background: #FEE2E2;
  color: #991B1B;
  border-left-color: var(--danger-color);
}

.alert-warning {
  background: #FEF3C7;
  color: #92400E;
  border-left-color: var(--warning-color);
}

.alert-info {
  background: #DBEAFE;
  color: #1E40AF;
  border-left-color: var(--info-color);
}

/* ========================================
   BADGES
======================================== */
.badge {
  padding: 0.375rem 0.75rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge.text-bg-primary {
  background: var(--primary-color) !important;
  color: var(--white) !important;
}

.badge.text-bg-success {
  background: var(--secondary-color) !important;
  color: var(--white) !important;
}

.badge.text-bg-secondary {
  background: var(--text-secondary) !important;
  color: var(--white) !important;
}

.badge.text-bg-warning {
  background: var(--warning-color) !important;
  color: var(--white) !important;
}

.badge.text-bg-danger {
  background: var(--danger-color) !important;
  color: var(--white) !important;
}

/* ========================================
   HERO SECTION
======================================== */
.hero-section {
  background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
  color: var(--white);
  padding: 4rem 2rem;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  margin-bottom: 2rem;
  position: relative;
  overflow: hidden;
}

.hero-section::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
  animation: pulse 4s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 0.5; }
  50% { transform: scale(1.1); opacity: 0.8; }
}

.hero-section h1 {
  font-size: 3rem;
  font-weight: 800;
  margin-bottom: 1rem;
  position: relative;
  z-index: 1;
}

.hero-section p {
  font-size: 1.25rem;
  opacity: 0.95;
  margin-bottom: 2rem;
  position: relative;
  z-index: 1;
}

/* ========================================
   CONTAINER E LAYOUT
======================================== */
main.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1rem;
}

.page-header {
  margin-bottom: 2rem;
  padding-bottom: 1rem;
  border-bottom: 2px solid var(--border-color);
}

.page-header h1,
.page-header h2,
.page-header h3,
.page-header h4 {
  color: var(--text-primary);
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.page-header p {
  color: var(--text-secondary);
  font-size: 1.125rem;
}

/* ========================================
   GRID DE PRODUTOS
======================================== */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  margin-top: 2rem;
}

.product-card {
  background: var(--white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  transition: var(--transition);
}

.product-card:hover {
  box-shadow: var(--shadow-xl);
  transform: translateY(-4px);
  border-color: var(--primary-color);
}

.product-cover-image {
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  transition: var(--transition);
}

.product-card:hover .product-cover-image img {
  transform: scale(1.05);
}

.product-cover-image img {
  transition: transform 0.5s ease;
  object-fit: cover;
}

.object-fit-cover {
  object-fit: cover !important;
}

/* ========================================
   UTILITIES
======================================== */
.text-muted {
  color: var(--text-secondary) !important;
}

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

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

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

.bg-light {
  background: var(--light-bg) !important;
}

.rounded-lg {
  border-radius: var(--radius-lg) !important;
}

.shadow-sm {
  box-shadow: var(--shadow-sm) !important;
}

.shadow-md {
  box-shadow: var(--shadow-md) !important;
}

.shadow-lg {
  box-shadow: var(--shadow-lg) !important;
}

/* ========================================
   RESPONSIVIDADE
======================================== */
@media (max-width: 768px) {
  .hero-section {
    padding: 2rem 1rem;
  }
  
  .hero-section h1 {
    font-size: 2rem;
  }
  
  .hero-section p {
    font-size: 1rem;
  }
  
  .product-grid {
    grid-template-columns: 1fr;
  }
  
  .table {
    font-size: 0.875rem;
  }
  
  .btn {
    width: 100%;
    justify-content: center;
  }
  
  .card-body {
    padding: 1rem;
  }
}

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

.animate-fade-in {
  animation: fadeIn 0.5s ease-out;
}

/* ========================================
   LOADING STATES
======================================== */
.skeleton {
  background: linear-gradient(90deg, #f0f0f0 25%, #e0e0e0 50%, #f0f0f0 75%);
  background-size: 200% 100%;
  animation: loading 1.5s ease-in-out infinite;
}

@keyframes loading {
  0% {
    background-position: 200% 0;
  }
  100% {
    background-position: -200% 0;
  }
}

/* ========================================
   UTILITIES EXTRAS
======================================== */
.object-fit-cover {
  object-fit: cover;
  object-position: center;
}

.sticky-top {
  position: sticky;
  z-index: 1020;
}

details summary {
  cursor: pointer;
  user-select: none;
  transition: var(--transition);
}

details summary:hover {
  color: var(--primary-color);
}

details[open] summary {
  margin-bottom: 0.5rem;
}

.text-break {
  word-break: break-word;
  overflow-wrap: break-word;
}

.bg-opacity-10 {
  --bs-bg-opacity: 0.1;
}

/* Melhorias para tabs */
.nav-tabs .nav-link {
  color: var(--text-secondary);
  border: none;
  border-bottom: 2px solid transparent;
  transition: var(--transition);
}

.nav-tabs .nav-link:hover {
  color: var(--primary-color);
  border-color: var(--primary-color);
}

.nav-tabs .nav-link.active {
  color: var(--primary-color);
  border-color: var(--primary-color);
  background: transparent;
  font-weight: 600;
}

/* Melhorias para acordeões e collapse */
.collapse:not(.show) {
  display: none;
}

.collapsing {
  transition: height 0.35s ease;
}

/* Card de aula melhorado */
.card-body details {
  margin-top: 0.75rem;
}

.card-body details summary {
  font-size: 0.875rem;
  font-weight: 500;
}

/* Lista de grupos flush melhorada */
.list-group-flush .list-group-item {
  border-left: 0;
  border-right: 0;
  border-radius: 0;
}

.list-group-flush .list-group-item:first-child {
  border-top: 0;
}

.list-group-flush .list-group-item:last-child {
  border-bottom: 0;
}

/* Badges pequenos */
.badge-sm {
  font-size: 0.7rem;
  padding: 0.25rem 0.5rem;
}

/* Melhorias para forms pequenos */
.form-control-sm,
.form-select-sm {
  padding: 0.375rem 0.75rem;
  font-size: 0.875rem;
}

/* Animação suave para módulos */
.card.mb-3 {
  animation: fadeIn 0.3s ease-out;
}

/* Hover melhorado para list-group */
.list-group-item:hover {
  background: var(--light-bg);
  border-color: var(--border-color);
}

/* Melhorias para produto cards na loja */
.product-card .product-cover-image {
  transition: transform 0.3s ease;
}

.product-card:hover .product-cover-image {
  transform: scale(1.05);
}

.product-card .product-cover-image img {
  transition: opacity 0.3s ease;
}

/* Preview de imagem */
#coverPreview {
  transition: all 0.3s ease;
}

#coverPreview img {
  transition: opacity 0.3s ease;
}

/* Botões em grupo compactos */
.btn-group-sm .btn {
  padding: 0.25rem 0.5rem;
  font-size: 0.875rem;
}

/* Accordion customizado */
.accordion-button {
  font-weight: 600;
}

.accordion-button:not(.collapsed) {
  color: var(--primary-color);
  background-color: rgba(var(--primary-color), 0.1);
}

.accordion-button:focus {
  box-shadow: 0 0 0 0.25rem rgba(var(--primary-color), 0.25);
}

/* ========================================
   DRAG AND DROP
======================================== */
.drag-handle {
  cursor: grab !important;
  opacity: 0.5;
  transition: opacity 0.2s;
}

.drag-handle:hover {
  opacity: 1;
}

.drag-handle:active {
  cursor: grabbing !important;
}

[draggable="true"] {
  cursor: move;
  transition: all 0.2s ease;
}

[draggable="true"]:active {
  cursor: grabbing;
}

.module-item.dragging,
.lesson-item.dragging {
  opacity: 0.5;
  border: 2px dashed var(--primary-color) !important;
  box-shadow: var(--shadow-lg);
  transform: scale(1.02);
}

/* ========================================
   EDIÇÃO INLINE
======================================== */
.edit-module-btn,
.edit-lesson-btn {
  transition: var(--transition);
}

.edit-module-btn:hover,
.edit-lesson-btn:hover {
  transform: scale(1.05);
}

/* ========================================
   MELHORIAS VISUAIS PARA MÓDULOS E AULAS
======================================== */
.module-item {
  transition: var(--transition);
}

.module-item:hover:not(.dragging) {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.lesson-item {
  transition: var(--transition);
}

.lesson-item:hover:not(.dragging) {
  border-color: var(--primary-color) !important;
  box-shadow: var(--shadow-md);
  transform: translateX(2px);
}

/* Badge pequeno */
.badge-sm {
  font-size: 0.7rem !important;
  padding: 0.25rem 0.5rem !important;
  font-weight: 600;
}