:root {
  --background-site: #FAFAFA;
  --background-menu: #FFFFFF;
  --background-submenu: #F0F4FF;
  --text_menu: #1976D2;
  --ciano-dark: #1565C0;
  --text-dark: #1E2D40;
  --text-muted: #78909C;
  --press: #1976d21a;
  --success: #4CAF50;
  --warning: #FF9800;
  --error: #F44336;
  --gradient-primary: linear-gradient(135deg, #1976D2 0%, #1565C0 100%);
  --gradient-success: linear-gradient(135deg, #4CAF50 0%, #388E3C 100%);
  --gradient-warning: linear-gradient(135deg, #FF9800 0%, #F57C00 100%);
  --shadow-light: 0 2px 8px rgba(0, 0, 0, 0.1);
  --shadow-medium: 0 4px 16px rgba(0, 0, 0, 0.15);
  --shadow-heavy: 0 8px 32px rgba(0, 0, 0, 0.2);
  --border-radius: 12px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Painel principal */
.home-panel {
  padding: 0;
  background-color: transparent;
  min-height: auto;
}

.header-section {
  margin-bottom: 32px;
  text-align: center;
}

.language-title {
  font-family: 'Nunito', sans-serif;
  font-size: 32px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-dark);
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  font-size: 16px;
  color: var(--text-muted);
  font-weight: 400;
}

/* Seção de filtros */
.filters-section {
  display: flex;
  gap: 24px;
  margin-bottom: 32px;
  padding: 20px;
  background-color: white;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-light);
  flex-wrap: wrap;
}

.filter-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 200px;
}

.filter-group label {
  font-weight: 600;
  color: var(--text-dark);
  font-size: 14px;
}

.filter-group select {
  padding: 10px 12px;
  border: 2px solid #e0e0e0;
  border-radius: 8px;
  background-color: white;
  color: var(--text-dark);
  font-size: 14px;
  cursor: pointer;
  transition: var(--transition);
}

.filter-group select:focus {
  outline: none;
  border-color: var(--text_menu);
  box-shadow: 0 0 0 3px rgba(25, 118, 210, 0.1);
}

/* Grid de idiomas */
.language-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
}

/* Cartão de idioma */
.language-card {
  background-color: white;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-light);
  overflow: hidden;
  transition: var(--transition);
  cursor: pointer;
  border: 2px solid transparent;
}

.language-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-medium);
  border-color: var(--text_menu);
}

.flag-container {
  height: 120px;
  background: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.flag-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(45deg, rgba(255,255,255,0.1) 0%, rgba(255,255,255,0.05) 100%);
}

.flag-image {
  width: 64px;
  height: 48px;
  object-fit: cover;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  position: relative;
  z-index: 1;
}

.language-info {
  padding: 24px;
}

.language-name {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-dark);
  margin-bottom: 8px;
  font-family: 'Nunito', sans-serif;
}

.language-description {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 20px;
  line-height: 1.5;
}

.level-indicator {
  margin-bottom: 20px;
}

.level-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 12px;
}

.level-badge.iniciante {
  background-color: #E8F5E8;
  color: #2E7D32;
}

.level-badge.intermediario {
  background-color: #FFF3E0;
  color: #F57C00;
}

.level-badge.avancado {
  background-color: #E3F2FD;
  color: #1976D2;
}

.progress-bar {
  width: 100%;
  height: 8px;
  background-color: #f0f0f0;
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 8px;
}

.progress-fill {
  height: 100%;
  background: var(--gradient-primary);
  border-radius: 4px;
  transition: width 0.6s ease;
}

.progress-text {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 600;
}

.action-btn {
  width: 100%;
  padding: 12px 16px;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.action-btn.start {
  background: var(--gradient-success);
  color: white;
}

.action-btn.start:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(76, 175, 80, 0.3);
}

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

.action-btn.continue:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(25, 118, 210, 0.3);
}

.action-btn i {
  font-size: 16px;
}

/* Estados de filtro */
.language-card.hidden {
  display: none;
}

/* Botão hamburger para mobile */
.hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
  padding: 10px;
  background: none;
  border: none;
  position: fixed;
  top: 20px;
  left: 20px;
  z-index: 1001;
}

.hamburger span {
  width: 25px;
  height: 3px;
  background-color: var(--text_menu);
  margin: 3px 0;
  transition: var(--transition);
}

/* Responsividade */
@media (max-width: 768px) {
  .hamburger {
    display: flex;
  }

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

  .sidebar.open {
    transform: translateX(0);
  }

  .main-content {
    margin-left: 0;
    padding: 20px 15px;
    padding-top: 80px;
  }

  .topbar {
    flex-direction: column;
    gap: 15px;
    align-items: stretch;
  }

  .searchbar input {
    width: 100%;
  }

  .user-profile {
    justify-content: center;
  }

  .language-title {
    font-size: 24px;
  }

  .filters-section {
    flex-direction: column;
    gap: 16px;
  }

  .filter-group {
    min-width: auto;
  }

  .language-list {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .language-card {
    margin-bottom: 0;
  }

  .language-info {
    padding: 20px;
  }
}

@media (max-width: 480px) {
  .main-content {
    padding: 15px 10px;
    padding-top: 70px;
  }

  .sidebar {
    width: 280px;
  }

  .language-title {
    font-size: 20px;
  }

  .subtitle {
    font-size: 14px;
  }

  .filters-section {
    padding: 16px;
  }

  .language-info {
    padding: 16px;
  }

  .language-name {
    font-size: 18px;
  }

  .language-description {
    font-size: 13px;
  }
}

/* Animações */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.language-card {
  animation: fadeInUp 0.6s ease forwards;
}

.language-card:nth-child(1) { animation-delay: 0.1s; }
.language-card:nth-child(2) { animation-delay: 0.2s; }
.language-card:nth-child(3) { animation-delay: 0.3s; }
.language-card:nth-child(4) { animation-delay: 0.4s; }
.language-card:nth-child(5) { animation-delay: 0.5s; }
.language-card:nth-child(6) { animation-delay: 0.6s; }

/* Melhorias de acessibilidade */
.action-btn:focus,
.filter-group select:focus,
.searchbar input:focus {
  outline: 2px solid var(--text_menu);
  outline-offset: 2px;
}

/* Estados de loading */
.language-card.loading {
  opacity: 0.6;
  pointer-events: none;
}

.language-card.loading .action-btn {
  background-color: #ccc;
  cursor: not-allowed;
}

/* Micro-interações */
.level-badge {
  transition: var(--transition);
}

.language-card:hover .level-badge {
  transform: scale(1.05);
}

.progress-fill {
  position: relative;
  overflow: hidden;
}

.progress-fill::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
  animation: shimmer 2s infinite;
}

@keyframes shimmer {
  0% { left: -100%; }
  100% { left: 100%; }
}