:root {
            --bg-color: #f4f7fe;
            --surface-color: #ffffff;
            --primary-color: #4318ff;
            --primary-hover: #3311db;
            --text-main: #2b3674;
            --text-muted: #a3aed1;
            --border-color: #e2e8f0;
            --danger-color: #ee5d50;
            --success-color: #05cd99;
            --radius: 14px;
            --radius-sm: 8px;
            --shadow-sm: 0 4px 10px rgba(0, 0, 0, 0.03);
            --shadow-md: 0 10px 20px rgba(0, 0, 0, 0.05);
        }

        * { box-sizing: border-box; margin: 0; padding: 0; }
        body { font-family: 'Inter', sans-serif; background-color: var(--bg-color); color: var(--text-main); display: flex; height: 100vh; overflow: hidden; -webkit-font-smoothing: antialiased; }
        h1, h2, h3 { font-weight: 700; color: var(--text-main); }
        ::-webkit-scrollbar { width: 6px; height: 6px; }
        ::-webkit-scrollbar-track { background: transparent; }
        ::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 10px; }
        ::-webkit-scrollbar-thumb:hover { background: #94a3b8; }

        /* Auth Overlay */
        .login-overlay { position: fixed; inset: 0; background: var(--bg-color); z-index: 1000; display: flex; align-items: center; justify-content: center; transition: opacity 0.4s ease; }
        .login-overlay.hidden { opacity: 0; pointer-events: none; }
        .login-card { background: var(--surface-color); padding: 3rem 2.5rem; border-radius: var(--radius); box-shadow: var(--shadow-md); width: 100%; max-width: 420px; }
        .login-header { text-align: center; margin-bottom: 2.5rem; }
        .login-header i { color: var(--primary-color); width: 48px; height: 48px; margin-bottom: 1rem; }
        
        .form-group { margin-bottom: 1.5rem; }
        .form-group label { display: block; font-size: 0.875rem; font-weight: 500; color: var(--text-main); margin-bottom: 0.5rem; }
        .form-control { width: 100%; padding: 0.75rem 1rem; border: 1px solid var(--border-color); border-radius: var(--radius-sm); font-size: 0.95rem; color: var(--text-main); outline: none; transition: border-color 0.2s; }
        .form-control:focus { border-color: var(--primary-color); }
        .btn { display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem; padding: 0.75rem 1.5rem; border-radius: var(--radius-sm); font-weight: 600; font-size: 0.95rem; cursor: pointer; transition: all 0.2s; border: none; }
        .btn-primary { background: var(--primary-color); color: white; }
        .btn-primary:hover { background: var(--primary-hover); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(67, 24, 255, 0.2); }
        .btn-danger { background: var(--red-bg); color: var(--danger-color); }
        .btn-sm { padding: 0.5rem 1rem; font-size: 0.85rem; }

        /* Layout */
        #app-container { display: flex; width: 100%; height: 100vh; }
        .sidebar { width: 280px; background: var(--surface-color); border-right: 1px solid var(--border-color); display: flex; flex-direction: column; padding: 2rem 1.5rem; z-index: 10; }
        .brand { font-size: 1.5rem; font-weight: 700; color: var(--text-main); margin-bottom: 3rem; display: flex; align-items: center; gap: 0.75rem; }
        .brand i { color: var(--primary-color); }
        .nav-list { display: flex; flex-direction: column; gap: 0.5rem; flex: 1; }
        .nav-item { display: flex; align-items: center; gap: 1rem; padding: 1rem 1.25rem; border-radius: var(--radius-sm); color: var(--text-muted); text-decoration: none; font-weight: 500; cursor: pointer; transition: all 0.2s; }
        .nav-item:hover { color: var(--primary-color); background: var(--bg-color); }
        .nav-item.active { color: white; background: var(--primary-color); }
        
        .main-content { flex: 1; display: flex; flex-direction: column; min-width: 0; }
        .topbar { height: 80px; padding: 0 2rem; display: flex; align-items: center; justify-content: space-between; background: var(--bg-color); flex-shrink: 0; }
        .topbar-title { font-size: 1.5rem; font-weight: 700; }
        .content-scroll { flex: 1; overflow-y: auto; padding: 0 2rem 2rem 2rem; }
        
        /* Views */
        .view-section { display: none; animation: fadeIn 0.4s ease; }
        .view-section.active { display: block; }
        @keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
        
        .card { background: var(--surface-color); border-radius: var(--radius); padding: 1.5rem; box-shadow: var(--shadow-sm); border: 1px solid rgba(0,0,0,0.02); margin-bottom: 1.5rem; }
        
        /* Tables & Lists */
        .table-container { width: 100%; overflow-x: auto; }
        table { width: 100%; border-collapse: separate; border-spacing: 0; }
        th { text-align: left; padding: 1rem; color: var(--text-muted); font-weight: 500; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.05em; border-bottom: 1px solid var(--border-color); }
        td { padding: 1rem; border-bottom: 1px solid var(--border-color); font-size: 0.95rem; }
        
        /* Grid */
        .grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1.5rem; }
        
        /* Modal Overlay */
        .modal-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.5); z-index: 2000; display: flex; align-items: center; justify-content: center; opacity: 0; pointer-events: none; transition: opacity 0.3s; }
        .modal-overlay.active { opacity: 1; pointer-events: auto; }
        .modal-card { background: var(--surface-color); width: 100%; max-width: 800px; border-radius: var(--radius); display: flex; flex-direction: column; max-height: 90vh; transform: translateY(20px); transition: transform 0.3s; }
        .modal-overlay.active .modal-card { transform: translateY(0); }
        .modal-header { padding: 1.5rem 2rem; border-bottom: 1px solid var(--border-color); display: flex; justify-content: space-between; align-items: center; flex-shrink: 0; }
        .modal-body { padding: 2rem; overflow-y: auto; flex: 1; }
        .modal-footer { padding: 1.5rem 2rem; border-top: 1px solid var(--border-color); display: flex; justify-content: flex-end; gap: 1rem; flex-shrink: 0; }
        .close-btn { cursor: pointer; color: var(--text-muted); transition: color 0.2s; }
        .close-btn:hover { color: var(--danger-color); }
        
        /* Dynamic Question Item */
        .question-item { background: #f8fafc; border: 1px solid var(--border-color); padding: 1.5rem; border-radius: var(--radius-sm); margin-bottom: 1rem; position: relative; }
        .remove-q-btn { position: absolute; top: 1rem; right: 1rem; color: var(--danger-color); cursor: pointer; }
        
        .charts-grid { display:grid; grid-template-columns:1fr 1fr; gap:1.5rem; flex:1; }

        @media print {
            body * { visibility: hidden !important; }
            * {
                -webkit-print-color-adjust: exact !important;
                print-color-adjust: exact !important;
                color-adjust: exact !important;
                box-sizing: border-box !important;
            }
            
            body, html {
                display: block !important;
                height: auto !important;
                width: 100% !important;
                overflow: visible !important;
                margin: 0 !important;
                padding: 0 !important;
                background: #fff !important;
            }
            
            body.print-detailed-modal #detailed-modal, 
            body.print-detailed-modal #detailed-modal * { visibility: visible !important; }
            body.print-detailed-modal #detailed-modal { position: absolute; left: 0; top: 0; width: 100vw !important; background: #fff; height: auto !important; overflow: visible !important; margin: 0 !important; padding: 20px !important; }
            body.print-detailed-modal .modal-card { width: 100%; box-shadow: none; border: none; border-radius: 0; margin: 0; padding: 0; height: auto !important; display: block !important; }
            body.print-detailed-modal .modal-body { overflow: visible !important; }
            
            body.print-single-teacher .print-active-card, 
            body.print-single-teacher .print-active-card * { visibility: visible !important; }
            body.print-single-teacher .print-active-card { position: absolute; left: 0; top: 0; width: 100vw !important; height: auto !important; overflow: visible !important; border:none; box-shadow:none; padding: 20px !important; margin: 0 !important;}
            
            body.print-all-teachers #analytics-charts, 
            body.print-all-teachers #analytics-charts * { visibility: visible !important; }
            body.print-all-teachers #analytics-charts { position: absolute; left: 0; top: 0; width: 100vw !important; height: auto !important; overflow: visible !important; margin:0 !important; padding: 10px !important; }
            
            .teacher-print-card { 
                break-inside: avoid; 
                border: 2px solid #0f172a !important; 
                margin-bottom: 0 !important; 
                page-break-after: always; 
                padding: 20px !important; 
                box-shadow: none !important;
                border-radius: 0 !important;
                background: #fff !important;
            }
            
            .print-only-details { 
                display: block !important; 
                margin-bottom: 20px !important;
                padding-bottom: 15px !important;
                border-bottom: 3px solid #0f172a !important; 
            }
            
            .print-only-details h2 { font-size: 24px !important; font-weight: 800 !important; color: #0f172a !important; text-transform: uppercase; letter-spacing: 1px; margin: 0 0 10px 0 !important;}
            .print-only-details .detail-grid { display: grid !important; grid-template-columns: 1fr 1fr; gap: 10px; font-size: 14px !important; color: #334155 !important; }
            .print-only-details .detail-grid strong { color: #0f172a !important; }
            
            /* Clean up chart boxes for print */
            body.print-all-teachers .charts-grid, body.print-single-teacher .charts-grid { 
                display: grid !important; 
                grid-template-columns: repeat(3, 1fr) !important; 
                gap: 15px !important; 
            }
            .q-block-MCQ, .q-block-RATING, .q-block-TEXT {
                width: 100% !important;
                margin-bottom: 0 !important;
                padding: 10px !important;
                background: #fff !important;
                border: 1px solid #cbd5e1 !important;
                border-radius: 0 !important;
                box-shadow: none !important;
                break-inside: avoid;
                page-break-inside: avoid;
            }
            .q-block-MCQ h5, .q-block-RATING h5, .q-block-TEXT h5 {
                margin-bottom: 8px !important;
                font-size: 11px !important;
                min-height: 25px !important;
            }
            
            .close-btn, button, input { display: none !important; }
            .hide-in-print { display: none !important; }
            canvas { max-width: 100%; max-height: 100%; }
        }
        /* ===== MOBILE CONTROLS ===== */
        .mobile-menu-btn {
            display: none; background: transparent; border: 1px solid var(--border-color);
            border-radius: var(--radius-sm); padding: 0.5rem; cursor: pointer; color: var(--text-main);
            align-items: center; justify-content: center; transition: all 0.2s;
        }
        .mobile-menu-btn:hover { background: #f1f5f9; color: var(--primary-color); }
        .sidebar-close-btn {
            display: none; background: transparent; border: none; cursor: pointer; color: var(--text-muted);
            padding: 0.35rem; border-radius: var(--radius-sm); align-items: center; justify-content: center; transition: all 0.2s;
        }
        .sidebar-close-btn:hover { color: var(--danger-color); background: #fee2e2; }
        .sidebar-backdrop {
            position: fixed; inset: 0; background: rgba(15, 23, 42, 0.5); backdrop-filter: blur(2px);
            z-index: 999; display: none; opacity: 0; transition: opacity 0.3s ease;
        }
        .sidebar-backdrop.active { display: block; opacity: 1; }

        /* ===== RESPONSIVE ===== */
        @media (max-width: 1024px) {
            html, body { padding: 0 !important; margin: 0 !important; overflow: hidden !important; width: 100% !important; height: 100% !important; }
            #app-container { border-radius: 0 !important; border: none !important; position: relative !important; overflow: hidden !important; width: 100% !important; height: 100% !important; }
            .mobile-menu-btn { display: inline-flex !important; }
            .sidebar-close-btn { display: inline-flex !important; }
            
            .sidebar {
                position: fixed !important; top: 0 !important; left: 0 !important; bottom: 0 !important;
                z-index: 10000 !important; transform: translateX(-100%) !important;
                transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1) !important;
                box-shadow: 4px 0 30px rgba(0,0,0,0.25) !important;
                width: 280px !important; max-width: 85vw !important; padding: 2rem 1.5rem !important;
            }
            .sidebar.mobile-open { transform: translateX(0) !important; }
            .brand { justify-content: space-between !important; margin-bottom: 2rem !important; }
            .main-content { margin-left: 0 !important; width: 100% !important; height: 100% !important; flex: 1 !important; display: flex !important; flex-direction: column !important; }
            .topbar { padding: 0 1.5rem !important; gap: 1rem !important; justify-content: flex-start !important; }
            .topbar-title { font-size: 1.25rem !important; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
            .content-scroll { padding: 1rem !important; }
            .grid-2 { grid-template-columns: 1fr !important; }
            .charts-grid { grid-template-columns: 1fr !important; }
        }
/* --- PRINT OPTIMIZATION --- */
@media print {
    body {
        background: white !important;
        color: black !important;
        margin: 0 !important;
        padding: 0 !important;
        overflow: visible !important;
    }
    .sidebar, .topbar, #mobile-menu-btn, button, .modal {
        display: none !important;
    }
    .main-content {
        margin-left: 0 !important;
        width: 100% !important;
        height: auto !important;
        overflow: visible !important;
    }
    .content-scroll {
        padding: 0 !important;
        height: auto !important;
        overflow: visible !important;
    }
    .card {
        box-shadow: none !important;
        border: 1px solid #ddd !important;
        break-inside: avoid !important;
        margin-bottom: 20px !important;
    }
    canvas {
        max-width: 100% !important;
        page-break-inside: avoid !important;
    }
}