/**
 * Universal Teacher - Browse/Discovery Styles
 * 3-Layer Course Navigation System
 * 
 * Copyright © 2025 Glimbr Pty Ltd and Arn Todal. All Rights Reserved.
 */

/* Breadcrumbs */
#breadcrumbs {
  padding: 16px 24px;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
}

.breadcrumb-link {
  color: var(--brand-primary);
  text-decoration: none;
  transition: opacity 0.2s;
}

.breadcrumb-link:hover {
  opacity: 0.7;
  text-decoration: underline;
}

.breadcrumb-current {
  color: var(--text-primary);
  font-weight: 500;
}

.breadcrumb-separator {
  color: var(--text-tertiary);
  margin: 0 4px;
}

/* Browse Container */
#browseContainer {
  flex: 1;
  overflow-y: auto;
  height: calc(100vh - 60px); /* Adjust for header height */
  width: 100%;
}

.browse-layer {
  padding: 32px 24px;
  max-width: 1400px;
  margin: 0 auto;
}

.browse-header {
  margin-bottom: 32px;
}

.browse-header h2 {
  font-size: 32px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 8px 0;
}

.browse-header .subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  margin: 0;
}

/* Search Input */
.search-input {
  width: 100%;
  max-width: 600px;
  padding: 12px 16px;
  font-size: 16px;
  border: 2px solid var(--border-color);
  border-radius: 12px;
  background: var(--bg-primary);
  color: var(--text-primary);
  margin-top: 16px;
  transition: border-color 0.2s;
}

.search-input:focus {
  outline: none;
  border-color: var(--brand-primary);
}

/* Layer 1: Subject Grid */
.subject-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  margin-top: 24px;
}

.subject-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 20px;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.subject-card:hover {
  transform: translateY(-2px);
  border-color: var(--brand-primary);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.subject-icon {
  font-size: 40px;
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  margin-bottom: 4px;
}

.subject-info {
  flex: 1;
}

.subject-name {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 6px 0;
}

.subject-description {
  font-size: 14px;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.4;
}

/* Layer 2: Level List */
.level-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  max-width: 800px;
}

.level-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 24px;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.level-card:hover {
  transform: translateX(4px);
  border-color: var(--brand-primary);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.level-icon {
  font-size: 40px;
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  flex-shrink: 0;
}

.level-info {
  flex: 1;
}

.level-name {
  font-size: 20px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 8px 0;
}

.level-description {
  font-size: 15px;
  color: var(--text-secondary);
  margin: 0 0 12px 0;
}

.level-sublevels {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.level-sublevels li {
  font-size: 13px;
  color: var(--text-tertiary);
  background: var(--bg-tertiary);
  padding: 4px 10px;
  border-radius: 6px;
}

.level-arrow {
  font-size: 24px;
  color: var(--text-tertiary);
  align-self: center;
}

/* Layer 3: Course Groups */
.course-groups {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.course-group {
  animation: fadeIn 0.3s ease-in;
}

.group-name {
  font-size: 24px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 8px 0;
}

.group-description {
  font-size: 15px;
  color: var(--text-secondary);
  margin: 0 0 20px 0;
}

.course-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}

.course-card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 20px;
  transition: all 0.2s;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.course-card:hover {
  border-color: var(--brand-primary);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.course-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
}

.course-title {
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
  flex: 1;
}

.course-difficulty {
  font-size: 11px;
  padding: 4px 8px;
  border-radius: 6px;
  font-weight: 600;
  text-transform: uppercase;
  white-space: nowrap;
}

.course-difficulty.beginner {
  background: #10b98120;
  color: #10b981;
}

.course-difficulty.intermediate {
  background: #f59e0b20;
  color: #f59e0b;
}

.course-difficulty.advanced {
  background: #ef444420;
  color: #ef4444;
}

.course-description {
  font-size: 14px;
  color: var(--text-secondary);
  margin: 0;
  line-height: 1.5;
}

.course-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 13px;
  color: var(--text-tertiary);
}

.course-audience,
.course-duration {
  display: flex;
  align-items: center;
  gap: 4px;
}

.course-prerequisites {
  font-size: 13px;
  color: var(--text-tertiary);
  padding: 8px 12px;
  background: var(--bg-tertiary);
  border-radius: 8px;
}

.course-prerequisites strong {
  color: var(--text-secondary);
}

.create-course-btn {
  margin-top: 8px;
  padding: 10px 16px;
  background: var(--brand-primary);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.create-course-btn:hover {
  background: var(--brand-primary-hover);
  transform: translateX(2px);
}

.create-course-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Loading State */
.loading-indicator {
  text-align: center;
  padding: 60px 20px;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--border-color);
  border-top-color: var(--brand-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 20px;
}

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

.loading-indicator p {
  color: var(--text-secondary);
  font-size: 15px;
}

/* Error State */
.error-state {
  text-align: center;
  padding: 60px 20px;
}

.error-icon {
  font-size: 64px;
  margin-bottom: 16px;
}

.error-state h3 {
  color: var(--text-primary);
  margin: 0 0 8px 0;
}

.error-state p {
  color: var(--text-secondary);
  margin: 0 0 24px 0;
}

.retry-btn {
  padding: 10px 20px;
  background: var(--brand-primary);
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}

.retry-btn:hover {
  background: var(--brand-primary-hover);
}

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

/* Mobile Responsive */
@media (max-width: 768px) {
  .browse-layer {
    padding: 20px 16px;
  }
  
  .browse-header h2 {
    font-size: 24px;
  }
  
  .browse-header .subtitle {
    font-size: 16px;
  }
  
  .subject-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  
  .course-list {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  
  .level-card {
    flex-direction: column;
  }
  
  .level-arrow {
    display: none;
  }
}