/* Meta Info */
.lesson-meta {
  display: flex;
  gap: 24px;
  margin-bottom: 32px;
  padding: 16px 20px;
  background: var(--border-light);
  border-radius: 12px;
  font-size: 0.875rem;
}

.lesson-meta-item {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-secondary);
}

.lesson-meta-item svg {
  width: 18px;
  height: 18px;
  color: var(--text-muted);
}

/* Exercise Badges */
.exercise-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  margin-right: 8px;
}

.exercise-badge.seedling {
  background: #DCFCE7;
  color: #166534;
}

.exercise-badge.growing {
  background: #FEF3C7;
  color: #92400E;
}

.exercise-badge.mature {
  background: #FEE2E2;
  color: #991B1B;
}

/* Progress Bar */
.progress-container {
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 8px;
}

.progress-label {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.progress-bar {
  height: 6px;
  background: var(--border);
  border-radius: 3px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: 3px;
  transition: width 0.5s ease;
}

/* Navigation Buttons */
.lesson-nav {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}

.lesson-nav-btn {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  color: var(--text-primary);
  text-decoration: none;
  transition: all var(--transition);
  cursor: pointer;
  max-width: 45%;
}

.lesson-nav-btn:hover {
  border-color: var(--primary);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.1);
}

.lesson-nav-btn.disabled {
  opacity: 0.5;
  pointer-events: none;
}

.lesson-nav-btn svg {
  width: 20px;
  height: 20px;
  color: var(--text-muted);
  flex-shrink: 0;
}

.lesson-nav-btn-content {
  display: flex;
  flex-direction: column;
  gap: 4px;
  overflow: hidden;
}

.lesson-nav-btn-label {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.lesson-nav-btn-title {
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.lesson-nav-btn.next {
  margin-left: auto;
  flex-direction: row-reverse;
  text-align: right;
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  color: white;
  padding: 80px 48px;
  margin: -48px -48px 48px;
  border-radius: 0 0 24px 24px;
}

.hero h1 {
  color: white;
  font-size: 2.5rem;
  margin-bottom: 16px;
}

.hero p {
  color: rgba(255,255,255,0.9);
  font-size: 1.125rem;
  max-width: 600px;
}

.hero-stats {
  display: flex;
  gap: 48px;
  margin-top: 32px;
}

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

.hero-stat-value {
  font-size: 2rem;
  font-weight: 700;
}

.hero-stat-label {
  font-size: 0.875rem;
  opacity: 0.8;
}

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin: 24px 0;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  transition: all var(--transition);
  cursor: pointer;
}

.card:hover {
  border-color: var(--primary);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.1);
  transform: translateY(-2px);
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.card-icon.blue { background: var(--primary-light); color: var(--primary); }
.card-icon.green { background: var(--secondary-light); color: var(--secondary); }
.card-icon.purple { background: var(--accent-light); color: var(--accent); }

.card-icon svg {
  width: 24px;
  height: 24px;
}

.card h3 {
  margin: 0 0 8px;
  font-size: 1.125rem;
}

.card p {
  margin: 0;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* Checklist */
.checklist {
  list-style: none;
  padding: 0;
}

.checklist li {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 8px 0;
}

.checklist li::before {
  content: '';
  width: 20px;
  height: 20px;
  border: 2px solid var(--border);
  border-radius: 4px;
  flex-shrink: 0;
  margin-top: 2px;
}

.checklist li.checked::before {
  background: var(--success);
  border-color: var(--success);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
}

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

.content {
  animation: fadeIn 0.3s ease;
}