@media print {
            body { margin: 0; padding: 10mm; font-size: 11pt; }
            .no-print { display: none; }
            .page-break { page-break-before: always; }
            .lesson-card { break-inside: avoid; }
        }
        body {
            font-family: 'Segoe UI', Arial, sans-serif;
            max-width: 900px;
            margin: 0 auto;
            padding: 40px;
            line-height: 1.6;
            color: #333;
        }
        .header {
            text-align: center;
            margin-bottom: 30px;
            padding-bottom: 20px;
            border-bottom: 3px solid #4f46e5;
        }
        .header h1 {
            color: #4f46e5;
            margin-bottom: 5px;
        }
        .header .subtitle {
            color: #64748b;
            font-size: 1.1em;
        }
        .intro-box {
            background: #f0f9ff;
            border: 2px solid #0284c7;
            border-radius: 12px;
            padding: 25px;
            margin-bottom: 30px;
        }
        .print-btn {
            background: #4f46e5;
            color: white;
            border: none;
            padding: 15px 30px;
            font-size: 1.1em;
            border-radius: 8px;
            cursor: pointer;
            margin: 20px auto;
            display: block;
        }
        .print-btn:hover {
            background: #4338ca;
        }
        .lesson-card {
            background: white;
            border: 2px solid #e2e8f0;
            border-radius: 15px;
            margin-bottom: 25px;
            overflow: hidden;
        }
        .lesson-header {
            padding: 20px;
            color: white;
        }
        .lesson-1 .lesson-header { background: linear-gradient(135deg, #3b82f6, #1d4ed8); }
        .lesson-2 .lesson-header { background: linear-gradient(135deg, #10b981, #059669); }
        .lesson-3 .lesson-header { background: linear-gradient(135deg, #8b5cf6, #7c3aed); }
        .lesson-4 .lesson-header { background: linear-gradient(135deg, #f59e0b, #d97706); }
        .lesson-5 .lesson-header { background: linear-gradient(135deg, #ef4444, #dc2626); }
        
        .lesson-number {
            font-size: 0.9em;
            opacity: 0.9;
        }
        .lesson-title {
            font-size: 1.5em;
            margin: 5px 0;
            font-weight: 700;
        }
        .lesson-meta {
            display: flex;
            gap: 20px;
            margin-top: 10px;
            font-size: 0.9em;
        }
        .lesson-meta span {
            display: flex;
            align-items: center;
            gap: 5px;
        }
        .lesson-body {
            padding: 25px;
        }
        .section {
            margin-bottom: 20px;
        }
        .section h4 {
            margin-bottom: 10px;
            color: #1e293b;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .section ul {
            margin: 0;
            padding-left: 25px;
        }
        .section li {
            margin: 5px 0;
        }
        .activity-timeline {
            background: #f8fafc;
            border-radius: 10px;
            padding: 15px 20px;
        }
        .timeline-item {
            display: flex;
            gap: 15px;
            padding: 10px 0;
            border-bottom: 1px dashed #e2e8f0;
        }
        .timeline-item:last-child {
            border-bottom: none;
        }
        .time-badge {
            background: #e0e7ff;
            color: #4f46e5;
            padding: 3px 10px;
            border-radius: 15px;
            font-size: 0.85em;
            font-weight: 600;
            white-space: nowrap;
        }
        .timeline-content {
            flex: 1;
        }
        .timeline-activity {
            font-weight: 600;
            color: #1e293b;
        }
        .timeline-desc {
            color: #64748b;
            font-size: 0.9em;
        }
        .materials-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 10px;
        }
        .material-item {
            background: #f1f5f9;
            padding: 8px 15px;
            border-radius: 8px;
            font-size: 0.9em;
        }
        .discussion-box {
            background: #fef3c7;
            border-left: 4px solid #f59e0b;
            padding: 15px;
            border-radius: 0 8px 8px 0;
        }
        .assessment-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 15px;
        }
        .assess-card {
            background: #f0fdf4;
            border: 1px solid #86efac;
            padding: 15px;
            border-radius: 10px;
        }
        .assess-card h5 {
            margin: 0 0 10px 0;
            color: #166534;
        }
        .extensions {
            background: #faf5ff;
            border: 1px solid #c4b5fd;
            padding: 15px;
            border-radius: 10px;
        }
        .extensions h5 {
            margin-top: 0;
            color: #7c3aed;
        }
        .curriculum-links {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 10px;
        }
        .curriculum-tag {
            background: white;
            border: 1px solid #cbd5e1;
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 0.8em;
            color: #475569;
        }
        .toc {
            background: #f8fafc;
            border-radius: 12px;
            padding: 25px;
            margin-bottom: 30px;
        }
        .toc h3 {
            margin-top: 0;
            color: #1e293b;
        }
        .toc-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .toc-list li {
            padding: 10px 15px;
            margin: 5px 0;
            border-radius: 8px;
            display: flex;
            align-items: center;
            gap: 15px;
        }
        .toc-1 { background: rgba(59, 130, 246, 0.1); border-left: 4px solid #3b82f6; }
        .toc-2 { background: rgba(16, 185, 129, 0.1); border-left: 4px solid #10b981; }
        .toc-3 { background: rgba(139, 92, 246, 0.1); border-left: 4px solid #8b5cf6; }
        .toc-4 { background: rgba(245, 158, 11, 0.1); border-left: 4px solid #f59e0b; }
        .toc-5 { background: rgba(239, 68, 68, 0.1); border-left: 4px solid #ef4444; }
        
        .footer {
            text-align: center;
            margin-top: 40px;
            padding-top: 20px;
            border-top: 2px solid #e2e8f0;
            color: #64748b;
        }