/* App Page Styles */
.app-page {
  background: #f5f5f5;
  min-height: 100vh;
  display: block;
  align-items: stretch;
  padding: 0;
}

/* Navbar */
.navbar {
  background: white;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  font-size: 1.5rem;
  font-weight: bold;
  color: #667eea;
  text-decoration: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-link {
  color: #666;
  text-decoration: none;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  transition: all 0.3s;
}

.nav-link:hover {
  background: #f0f0f0;
  color: #667eea;
}

.nav-link.active {
  background: #667eea;
  color: white;
}

.nav-user {
  color: #333;
  font-weight: 500;
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.9rem;
}

/* App Container */
.app-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem;
}

/* View Management */
.view {
  display: none;
}

.view.active {
  display: block;
}

.view-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

.view-header h1 {
  color: #333;
  font-size: 2rem;
}

/* Courses Grid */
.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.course-card {
  background: white;
  border-radius: 8px;
  padding: 1.5rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  transition: all 0.3s;
  cursor: pointer;
}

.course-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

.course-card-header {
  margin-bottom: 1rem;
}

.course-card-title {
  font-size: 1.3rem;
  color: #333;
  margin-bottom: 0.5rem;
}

.course-card-meta {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 0.5rem;
}

.badge {
  padding: 0.25rem 0.75rem;
  border-radius: 12px;
  font-size: 0.85rem;
  font-weight: 500;
}

.badge-category {
  background: #e3f2fd;
  color: #1976d2;
}

.badge-difficulty {
  background: #f3e5f5;
  color: #7b1fa2;
}

.badge-status {
  background: #fff3e0;
  color: #e65100;
}

.badge-status.ready {
  background: #e8f5e9;
  color: #2e7d32;
}

.course-card-description {
  color: #666;
  line-height: 1.5;
  margin-bottom: 1rem;
}

.course-card-stats {
  display: flex;
  gap: 1rem;
  font-size: 0.9rem;
  color: #999;
  margin-bottom: 1rem;
}

.course-card-actions {
  display: flex;
  gap: 0.5rem;
}

.btn-icon {
  padding: 0.5rem;
  background: #f5f5f5;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.3s;
  font-size: 0.9rem;
}

.btn-icon:hover {
  background: #e0e0e0;
}

.btn-danger {
  background: #ffebee;
  color: #c62828;
}

.btn-danger:hover {
  background: #ffcdd2;
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: #999;
}

.empty-state h3 {
  color: #666;
  margin-bottom: 0.5rem;
}

/* Form Container */
.form-container {
  max-width: 900px;
}

.form-card {
  background: white;
  border-radius: 8px;
  padding: 2rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.form-card h2 {
  color: #333;
  margin-bottom: 1.5rem;
  font-size: 1.5rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  color: #333;
  font-weight: 500;
}

.form-group input[type="text"],
.form-group input[type="number"],
.form-group input[type="file"],
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 0.75rem;
  border: 2px solid #ddd;
  border-radius: 6px;
  font-size: 1rem;
  transition: border-color 0.3s;
  font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: #667eea;
}

.form-group textarea {
  resize: vertical;
  min-height: 80px;
}

.form-group input[type="checkbox"] {
  margin-right: 0.5rem;
}

.help-text {
  display: block;
  margin-top: 0.5rem;
  font-size: 0.85rem;
  color: #999;
}

.form-actions {
  display: flex;
  gap: 1rem;
  margin-top: 2rem;
}

/* Section Header */
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.section-header h2 {
  margin-bottom: 0;
}

/* Module Item */
.module-item {
  border: 2px solid #e0e0e0;
  border-radius: 8px;
  margin-bottom: 1rem;
  overflow: hidden;
}

.module-header {
  background: #f5f5f5;
  padding: 1rem 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
  transition: background 0.3s;
}

.module-header:hover {
  background: #eeeeee;
}

.module-title {
  font-size: 1.2rem;
  font-weight: 600;
  color: #333;
  margin-bottom: 0.25rem;
}

.module-info {
  font-size: 0.9rem;
  color: #666;
}

.module-actions {
  display: flex;
  gap: 0.5rem;
}

.module-content {
  display: none;
  padding: 1.5rem;
  background: white;
}

.module-content.expanded {
  display: block;
}

.lessons-list {
  margin-top: 1rem;
}

.lesson-item {
  background: #fafafa;
  border: 1px solid #e0e0e0;
  border-radius: 6px;
  padding: 1rem;
  margin-bottom: 0.75rem;
}

.lesson-header {
  display: flex;
  justify-content: space-between;
  align-items: start;
  margin-bottom: 0.5rem;
}

.lesson-title {
  font-size: 1.1rem;
  font-weight: 500;
  color: #333;
}

.lesson-description {
  color: #666;
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
}

.lesson-meta {
  display: flex;
  gap: 1rem;
  font-size: 0.85rem;
  color: #999;
  margin-bottom: 0.75rem;
}

.content-items {
  margin-top: 0.75rem;
}

.content-item {
  background: white;
  border: 1px solid #e0e0e0;
  border-radius: 4px;
  padding: 0.75rem;
  margin-bottom: 0.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.content-type-badge {
  display: inline-block;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
}

.content-type-text { background: #e3f2fd; color: #1976d2; }
.content-type-audio { background: #f3e5f5; color: #7b1fa2; }
.content-type-video { background: #e8f5e9; color: #2e7d32; }
.content-type-image { background: #fff3e0; color: #e65100; }
.content-type-document { background: #fce4ec; color: #c2185b; }
.content-type-interactive { background: #e0f2f1; color: #00695c; }

/* Modal */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  align-items: center;
  justify-content: center;
}

.modal.active {
  display: flex;
}

.modal-content {
  background: white;
  border-radius: 8px;
  padding: 2rem;
  max-width: 600px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
}

.modal-large {
  max-width: 800px;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.modal-header h2 {
  margin: 0;
  color: #333;
}

.modal-close {
  background: none;
  border: none;
  font-size: 2rem;
  color: #999;
  cursor: pointer;
  padding: 0;
  width: 32px;
  height: 32px;
  line-height: 1;
}

.modal-close:hover {
  color: #333;
}

.modal-actions {
  display: flex;
  gap: 1rem;
  margin-top: 2rem;
}

/* Content Input Sections */
.content-input {
  margin-bottom: 1.5rem;
}

/* Progress Bar */
.progress-bar {
  width: 100%;
  height: 8px;
  background: #e0e0e0;
  border-radius: 4px;
  overflow: hidden;
  margin-bottom: 0.5rem;
}

.progress-fill {
  height: 100%;
  background: #667eea;
  transition: width 0.3s;
  width: 0%;
}

/* Utility Classes */
.hidden {
  display: none !important;
}

.text-center {
  text-align: center;
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }

/* Responsive */
@media (max-width: 768px) {
  .nav-container {
    flex-direction: column;
    gap: 1rem;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .courses-grid {
    grid-template-columns: 1fr;
  }

  .view-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 1rem;
  }
}