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i{background:linear-gradient(135deg,var(--primary-color),var(--secondary-color));-webkit-background-clip:text;background-clip:text}.landing-brand i{-webkit-text-fill-color:#0000;font-size:1.8rem}.login-container{align-items:center;display:flex;flex:1 1;justify-content:center;margin:0 auto;max-width:480px;padding:40px 20px;width:100%}.login-card{background:var(--bg-primary);border:1px solid #ffffff1a;border-radius:16px;box-shadow:0 20px 60px #0000004d;padding:48px}.login-card h1{color:var(--text-primary);font-size:2rem;font-weight:700;margin-bottom:10px;text-align:center}.login-subtitle{color:var(--text-secondary);margin-bottom:32px;text-align:center}.login-page .login-container .login-card 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0;text-align:center}.divider:after,.divider:before{border-bottom:1px solid var(--border-color);content:"";flex:1 1}.divider span{color:var(--text-secondary);font-size:.9rem;padding:0 12px}.google-signin-container{display:flex;justify-content:center;margin-bottom:24px}@media (max-width:600px){.landing-header{padding:16px 20px}.landing-brand{font-size:1.25rem}.landing-brand i{font-size:1.5rem}.form-row{grid-template-columns:1fr}.login-card{padding:32px 24px}}.welcome-banner{align-items:center;animation:fadeIn .3s ease;background:#000000b3;bottom:0;display:flex;justify-content:center;left:0;padding:20px;position:fixed;right:0;top:0;z-index:10000}.welcome-content{animation:slideUp .3s ease;background:var(--bg-primary);border:1px solid var(--border-color);border-radius:16px;box-shadow:0 20px 60px #0000004d;max-width:600px;padding:32px;width:100%}.welcome-header{align-items:center;display:flex;gap:12px;margin-bottom:16px}.welcome-header i{color:var(--primary-color);font-size:2rem}.welcome-header h3{color:var(--text-primary);flex:1 1;margin:0}.close-btn{background:none;border:none;border-radius:8px;color:var(--text-secondary);cursor:pointer;font-size:1.5rem;padding:4px 8px;transition:all .2s ease}.close-btn:hover{background:var(--bg-secondary);color:var(--text-primary)}.welcome-text{color:var(--text-secondary);line-height:1.6;margin-bottom:24px}.welcome-steps{flex-direction:column;margin-bottom:24px}.step,.welcome-steps{display:flex;gap:16px}.step,.step-number{align-items:center}.step-number{background:var(--primary-color);border-radius:50%;color:#fff;display:flex;flex-shrink:0;font-size:1rem;font-weight:700;height:36px;justify-content:center;width:36px}.step-content{display:flex;flex:1 1;flex-direction:column;gap:4px}.step-content strong{color:var(--text-primary)}.step-content span{color:var(--text-secondary);font-size:.9rem}.welcome-actions{display:flex;gap:12px;justify-content:flex-end}.welcome-actions .btn{gap:8px;padding:10px 20px}.welcome-actions .btn,.welcome-actions .btn i{align-items:center;display:inline-flex;vertical-align:middle}.welcome-actions .btn i{line-height:1}@media (max-width:480px){.welcome-content{padding:24px}.welcome-actions{flex-direction:column}.welcome-actions .btn{justify-content:center;width:100%}}.lesson-generated-content{background:#000000b3;bottom:0;display:flex;flex-direction:column;left:0;overflow-y:auto;padding:20px;position:fixed;right:0;top:0;z-index:1000}.lesson-generated-content .content-header{align-items:center;background:#fff;border-radius:8px 8px 0 0;box-shadow:0 2px 10px #0000001a;display:flex;justify-content:space-between;padding:20px}.lesson-generated-content .content-header h2{font-size:1.5rem;margin:0}.lesson-generated-content .btn-close{padding:8px 12px}.lesson-generated-content .content-tabs{background:#fff;border-bottom:2px solid #e0e0e0;display:flex;gap:0;padding:0 20px}.lesson-generated-content .tab-button{align-items:center;background:none;border:none;border-bottom:3px solid #0000;color:#666;cursor:pointer;display:flex;font-size:1rem;gap:8px;padding:15px 20px;transition:all .3s}.lesson-generated-content .tab-button:hover{background:#f8f9fa;color:#007bff}.lesson-generated-content .tab-button.active{border-bottom-color:#007bff;color:#007bff;font-weight:600}.lesson-generated-content .content-body{background:#fff;border-radius:0 0 8px 8px;box-shadow:0 2px 10px #0000001a;flex:1 1;overflow-y:auto;padding:30px}.lesson-generated-content .exam-content,.lesson-generated-content .summary-content{margin:0 auto;max-width:900px}.lesson-generated-content .summary-header h3{color:#333;margin-bottom:20px}.lesson-generated-content .summary-text{color:#444;line-height:1.8;max-height:none;overflow:visible}.lesson-generated-content .summary-text.markdown-content{font-size:1rem;max-height:none;overflow:visible}.lesson-generated-content .summary-text.markdown-content h1,.lesson-generated-content .summary-text.markdown-content h2,.lesson-generated-content .summary-text.markdown-content h3{color:#333;margin-bottom:.5em;margin-top:1.5em}.lesson-generated-content .summary-text.markdown-content p{margin-bottom:1em}.lesson-generated-content .summary-text.markdown-content ol,.lesson-generated-content .summary-text.markdown-content ul{margin-bottom:1em;padding-left:2em}.lesson-generated-content .summary-text.markdown-content li{margin-bottom:.5em}.lesson-generated-content .generated-exam{width:100%}.lesson-generated-content .exam-header{border-bottom:2px solid #e0e0e0;margin-bottom:30px;padding-bottom:20px}.lesson-generated-content .exam-header h2{color:#333;margin-bottom:15px}.lesson-generated-content .exam-meta{display:flex;flex-wrap:wrap;gap:15px}.lesson-generated-content .exam-badge{align-items:center;background:#f8f9fa;border-radius:20px;color:#666;display:inline-flex;font-size:.9rem;gap:6px;padding:6px 12px}.lesson-generated-content 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span:first-child{animation-delay:0s}.generating-content .loading-dots span:nth-child(2){animation-delay:.2s}.generating-content .loading-dots span:nth-child(3){animation-delay:.4s}@keyframes dotBounce{0%,80%,to{opacity:.5;transform:scale(.8)}40%{opacity:1;transform:scale(1.2)}}.lesson-requirement-message{align-items:center;background:var(--bg-primary);border-radius:12px;box-shadow:var(--shadow-md);display:flex;justify-content:center;margin:20px 0;padding:60px 20px;text-align:center}.lesson-requirement-icon{color:var(--primary-color);font-size:4rem;margin-right:24px;opacity:.8}.lesson-requirement-content h3{color:var(--text-primary);font-size:1.5rem;font-weight:600;margin-bottom:12px}.lesson-requirement-content p{color:var(--text-secondary);font-size:1.1rem;line-height:1.6;margin-bottom:24px;max-width:500px}.lesson-requirement-content .btn{align-items:center;border-radius:8px;display:inline-flex;font-size:1rem;font-weight:500;gap:8px;padding:12px 24px;transition:all .2s ease}.lesson-requirement-content .btn i{font-size:1.1rem}@media (max-width:768px){.lesson-requirement-message{flex-direction:column;padding:40px 20px}.lesson-requirement-icon{font-size:3rem;margin-bottom:20px;margin-right:0}.lesson-requirement-content h3{font-size:1.3rem}.lesson-requirement-content p{font-size:1rem}}.create-exam-form{margin-bottom:32px;padding:32px}.create-exam-form h2{color:var(--text-primary);font-size:1.5rem;font-weight:600;margin-bottom:24px}.form-row{grid-gap:16px;display:grid;gap:16px;grid-template-columns:1fr 1fr}.form-group select{background-color:var(--bg-primary);border:2px solid var(--border-color);border-radius:8px;cursor:pointer;font-size:14px;padding:12px;transition:border-color .2s;width:100%}.form-group select:focus{border-color:var(--primary-color);outline:none}.form-group input[type=number]{background-color:var(--bg-primary);border:2px solid var(--border-color);border-radius:8px;font-size:14px;padding:12px;transition:border-color 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12px;width:-webkit-fit-content;width:fit-content}.exam-lesson-tag i,.form-help{font-size:.875rem}.form-help{color:var(--text-secondary);display:block;font-style:italic;margin-top:6px}.warning-message{background:linear-gradient(135deg,#fff3cd,#fff8e1);border:2px solid var(--warning-color);border-radius:8px;padding:24px;text-align:center}.warning-message i{color:var(--warning-color);font-size:2.5rem;margin-bottom:12px}.warning-message p{color:var(--text-primary);font-size:1rem;margin:8px 0}.warning-message p:first-of-type{font-weight:600}.exam-header{align-items:flex-start;justify-content:space-between}.exam-header h3{flex:1 1;margin:0}.difficulty-badge{border-radius:12px;white-space:nowrap}.difficulty-easy{background-color:#d4f1e8;color:#2d6a4f}.difficulty-medium{background-color:#fff3cd;color:#856404}.difficulty-hard{background-color:#fce4e4;color:#a85555}.exam-type{border-top:1px solid var(--border-color);display:flex;padding:8px 0}.exam-type i{color:var(--primary-color)}.example-exercise-container{background:linear-gradient(135deg,var(--bg-secondary),var(--bg-primary));border:2px solid var(--primary-color);border-radius:12px;box-shadow:0 4px 12px #0000001a;margin:32px 0;padding:24px}.example-exercise-container h3{align-items:center;color:var(--primary-color);display:flex;font-size:1.25rem;font-weight:600;gap:8px;margin-bottom:20px}.example-exercise{background:var(--bg-primary);border:1px solid var(--border-color);border-radius:8px;padding:20px}.exercise-content h4{color:var(--text-primary);font-size:1.1rem;font-weight:600;line-height:1.4;margin-bottom:16px}.options,.true-false-options{margin:16px 0}.option{align-items:center;background:var(--bg-secondary);border:2px solid var(--border-color);border-radius:8px;display:flex;gap:12px;margin:8px 0;padding:12px 16px;transition:all .2s ease}.option.correct{background:linear-gradient(135deg,#d4f1e8,#e8f5f0);border-color:#2d6a4f}.option-letter{background:var(--primary-color);color:#fff;font-size:.875rem;font-weight:600}.option.correct .option-letter{background:#2d6a4f}.option-text{font-size:.95rem}.exercise-example,.exercise-explanation{background:var(--bg-secondary);border-left:4px solid var(--primary-color);border-radius:8px;margin:20px 0;padding:16px}.exercise-example h5,.exercise-explanation h5{color:var(--primary-color);font-size:1rem;font-weight:600;margin-bottom:8px}.exercise-example p,.exercise-explanation p{color:var(--text-primary);font-size:.95rem;line-height:1.5;margin:0}@media (max-width:768px){.form-row{grid-template-columns:1fr}.exam-header{align-items:flex-start;flex-direction:column}.difficulty-badge{align-self:flex-start}.example-exercise-container{margin:24px 0;padding:16px}.example-exercise{padding:16px}}.edit-exercise-modal{align-items:center;background-color:#00000080;display:flex;height:100%;justify-content:center;left:0;position:fixed;top:0;width:100%;z-index:1000}.modal-content{background:#fff;border-radius:12px;box-shadow:0 20px 40px #00000026;max-width:600px}.modal-header{border-bottom:1px solid #e5e7eb;padding:20px 24px}.modal-header h3{color:#1f2937;font-size:1.5rem;font-weight:600;margin:0}.close-button{background:none;border:none;border-radius:4px;color:#6b7280;cursor:pointer;font-size:1.5rem;padding:4px;transition:all .2s}.close-button:hover{background-color:#f3f4f6;color:#374151}.error-message{background-color:#fef2f2;border:1px solid #fecaca;border-radius:8px;color:#dc2626;margin-bottom:20px;padding:12px 16px}.form-group label{color:#374151}.form-group input,.form-group select,.form-group textarea{border:1px solid #d1d5db;border-radius:8px;font-size:14px;padding:12px 16px;transition:border-color .2s;width:100%}.form-group input:focus,.form-group select:focus,.form-group textarea:focus{border-color:#6366f1;box-shadow:0 0 0 3px #6366f11a;outline:none}.form-group textarea{min-height:80px}.option-row{align-items:center;display:flex;gap:12px;margin-bottom:12px}.option-row input{flex:1 1}.remove-option-btn{background-color:#6b7280;border:none;border-radius:6px;color:#fff;cursor:pointer;padding:8px 12px;transition:background-color .2s}.remove-option-btn:hover:not(:disabled){background-color:#4b5563}.remove-option-btn:disabled{background-color:#d1d5db;cursor:not-allowed}.add-option-btn{align-items:center;background-color:#6366f1;border:none;border-radius:6px;color:#fff;cursor:pointer;display:flex;gap:8px;padding:8px 16px;transition:background-color .2s}.add-option-btn:hover{background-color:#4f46e5}.modal-footer{border-top:1px solid #e5e7eb;padding:20px 24px}.btn{display:flex;font-size:14px;transition:all .2s}.btn-primary{background-color:#6366f1}.btn-primary:hover:not(:disabled){background-color:#4f46e5}.btn-secondary:hover:not(:disabled){background-color:#4b5563}.btn:disabled{opacity:.5}.exercise-actions{border-top:1px solid #e5e7eb;display:flex;justify-content:flex-end;margin-top:16px;padding-top:16px}.btn-sm{font-size:12px;padding:6px 12px}.btn-outline-primary{background-color:initial;border:1px solid #6366f1;color:#6366f1}.btn-outline-primary:hover:not(:disabled){background-color:#6366f1;color:#fff}.view-exam-page{background:var(--bg-secondary);padding-top:88px}.exam-view-header{background:var(--bg-primary);border-radius:12px;box-shadow:var(--shadow-md);margin-bottom:24px;padding:32px}.exam-view-title{align-items:flex-start;display:flex;flex-wrap:wrap;gap:16px;justify-content:space-between;margin:24px 0 16px}.exam-view-title h1{color:var(--text-primary);flex:1 1;font-size:2rem;margin-bottom:12px}.btn-delete-exam{margin-top:8px;min-width:120px}.exam-badges{display:flex;flex-wrap:wrap;gap:12px}.type-badge{align-items:center;background:linear-gradient(135deg,var(--secondary-color),var(--primary-light));border-radius:12px;color:#fff;display:inline-flex;font-size:.875rem;font-weight:600;gap:6px;padding:6px 14px}.exam-view-description{color:var(--text-secondary);font-size:1rem;line-height:1.7;margin:20px 0}.exam-view-meta{border-bottom:1px solid var(--border-color);border-top:1px solid var(--border-color);color:var(--text-secondary);display:flex;gap:24px;padding:16px 0}.exam-view-meta span{align-items:center;display:flex;gap:8px}.exam-view-meta i{color:var(--primary-color)}.exam-controls{align-items:center;display:flex;flex-wrap:wrap;gap:16px;justify-content:space-between;margin-top:24px}.reveal-controls{display:flex;gap:12px}.exercises-list{display:flex;flex-direction:column;gap:20px}.exercise-card{background:var(--bg-primary);border:1px solid var(--border-color);border-radius:12px;box-shadow:var(--shadow-md);padding:28px}.exercise-header{align-items:center;border-bottom:2px solid var(--border-color);display:flex;justify-content:space-between;margin-bottom:20px;padding-bottom:16px}.exercise-number{color:var(--primary-color);font-size:1rem;font-weight:700}.btn-reveal{align-items:center;background:var(--bg-secondary);border:2px solid var(--primary-color);border-radius:8px;color:var(--primary-color);cursor:pointer;display:flex;font-weight:500;gap:8px;padding:8px 16px;transition:all .2s}.btn-reveal:hover{background:var(--primary-color);color:#fff}.exercise-question{color:var(--text-primary);font-size:1.15rem;line-height:1.6;margin-bottom:20px}.options-display{display:flex;flex-direction:column;gap:12px;margin-bottom:16px}.option-display{align-items:center;background:var(--bg-secondary);border:2px solid var(--border-color);border-radius:8px;display:flex;gap:12px;padding:14px;transition:all .2s}.option-display.correct-option{background:linear-gradient(135deg,#d4f1e8,#b8e6d5);border-color:var(--success-color);border-width:3px}.option-letter{align-items:center;background:var(--bg-primary);border:2px solid var(--border-color);border-radius:50%;color:var(--text-primary);display:flex;font-weight:700;height:32px;justify-content:center;width:32px}.option-display.correct-option .option-letter{background:var(--success-color);border-color:var(--success-color);color:#fff}.correct-icon{color:var(--success-color);font-size:1.5rem;margin-left:auto}.true-false-display{grid-gap:12px;display:grid;gap:12px;grid-template-columns:1fr 1fr;margin-bottom:16px}.tf-option{align-items:center;background:var(--bg-secondary);border:2px solid var(--border-color);border-radius:10px;display:flex;flex-direction:column;gap:8px;padding:16px;position:relative;transition:all .2s}.tf-option.correct-option{background:linear-gradient(135deg,#d4f1e8,#b8e6d5);border-color:var(--success-color);border-width:3px}.tf-option i:first-child{font-size:1.75rem}.tf-option span{color:var(--text-primary);font-size:1rem;font-weight:600}.tf-option .correct-icon{font-size:1.25rem;position:absolute;right:10px;top:10px}.answer-explanation{background:linear-gradient(135deg,#7c9cbf1a,#a0bdd90d);border-left:4px solid var(--primary-color);border-radius:8px;display:flex;gap:12px;margin-top:16px;padding:16px}.answer-explanation i{color:var(--primary-color);flex-shrink:0;font-size:1.25rem;margin-top:2px}.answer-explanation strong{color:var(--text-primary);display:block;margin-bottom:8px}.answer-explanation p{color:var(--text-secondary);line-height:1.6;margin:0}.question-example-display,.question-hint-display{border-radius:8px;display:flex;gap:12px;margin-bottom:12px;padding:16px}.question-hint-display{background:linear-gradient(135deg,#f5a96226,#f5a9620d);border-left:4px solid var(--warning-color)}.question-hint-display i{color:var(--warning-color);flex-shrink:0;font-size:1.25rem;margin-top:2px}.question-example-display{background:linear-gradient(135deg,#5eb88e26,#5eb88e0d);border-left:4px solid var(--accent-color)}.question-example-display i{color:var(--accent-color);flex-shrink:0;font-size:1.25rem;margin-top:2px}.question-example-display strong,.question-hint-display strong{color:var(--text-primary);display:block;margin-bottom:6px}.question-example-display p,.question-hint-display p{color:var(--text-secondary);line-height:1.6;margin:0}.open-question-badge{align-items:center;background:var(--secondary-color);border-radius:12px;color:#fff;display:flex;font-size:.875rem;font-weight:600;gap:6px;padding:6px 12px}.open-question-note{background:var(--bg-secondary);border-radius:8px;display:flex;font-style:italic;gap:12px;margin-top:16px;padding:16px}.open-question-note i{color:var(--primary-color);flex-shrink:0;margin-top:2px}.open-question-note p{color:var(--text-secondary);font-size:.875rem;margin:0}@media (max-width:768px){.exam-view-header{padding:20px}.exam-view-title h1{font-size:1.5rem}.exam-controls{align-items:stretch}.exam-controls,.reveal-controls{flex-direction:column}.reveal-controls .btn{width:100%}.true-false-display{grid-template-columns:1fr}.exam-view-meta{flex-direction:column;gap:12px}}.take-exam-page{background:var(--bg-secondary);display:flex;flex-direction:column;min-height:100vh;padding:88px 20px 40px}.exam-container{margin:0 auto;max-width:1200px;width:100%!important}.take-exam-page .question-card{max-width:100%!important;min-width:auto!important;width:100%!important}.exam-header-bar{background:var(--bg-primary);border-radius:12px;box-shadow:var(--shadow-md);margin-bottom:16px;padding:24px}.exam-info h1{color:var(--text-primary);font-size:1.75rem;margin-bottom:8px}.exam-info p{color:var(--text-secondary);margin:0}.exam-progress-info{border-top:1px solid var(--border-color);display:flex;justify-content:space-between;margin-top:16px;padding-top:16px}.progress-text{color:var(--text-primary);font-weight:600}.answered-count{color:var(--text-secondary);font-size:.875rem}.progress-bar{background:var(--border-color);border-radius:4px;height:8px;margin-bottom:24px;overflow:hidden;width:100%}.progress-fill{background:linear-gradient(90deg,var(--primary-color),var(--primary-light));height:100%;transition:width .3s ease}.question-card{margin-bottom:24px;max-width:100%!important;min-height:400px;min-width:auto!important;padding:32px;width:100%!important}.question-number-badge{background:linear-gradient(135deg,var(--primary-color),var(--primary-light));border-radius:20px;color:#fff;display:inline-block;font-size:.875rem;font-weight:600;margin-bottom:20px;padding:6px 16px}.question-content{display:flex;flex:1 1;flex-direction:column;margin-bottom:32px}.question-text{color:var(--text-primary);font-size:1.25rem;line-height:1.6;margin-bottom:24px}.options-list{display:flex;flex-direction:column;gap:12px;max-width:100%}.options-list.true-false{flex-direction:row;gap:16px}.option-item{align-items:center;background:var(--bg-secondary);border:2px solid var(--border-color);border-radius:8px;box-sizing:border-box;cursor:pointer;display:flex;gap:12px;padding:16px;transition:all .2s;width:100%}.option-item:hover{background:var(--bg-primary);border-color:var(--primary-light)}.option-item.selected{background:linear-gradient(135deg,#7c9cbf1a,#a0bdd91a);border-color:var(--primary-color)}.option-item input[type=radio]{cursor:pointer;height:20px;width:20px}.option-text{align-items:center;color:var(--text-primary);display:flex;flex:1 1;font-weight:500;gap:8px}.options-list.true-false .option-item{flex:1 1;justify-content:center}.options-list.true-false .option-text{font-size:1.1rem;font-weight:600}.question-example,.question-hint{align-items:flex-start;border-radius:8px;display:flex;font-size:.875rem;gap:8px;margin-bottom:16px;padding:12px}.question-hint{background:linear-gradient(135deg,#f5a9621a,#f5a9620d);border-left:4px solid var(--warning-color)}.question-hint i{color:var(--warning-color);margin-top:2px}.question-example{background:linear-gradient(135deg,#7c9cbf1a,#7c9cbf0d);border-left:4px solid var(--primary-color)}.question-example i{color:var(--primary-color);margin-top:2px}.open-answer{border:2px solid var(--border-color);border-radius:8px;box-sizing:border-box;font-family:inherit;font-size:1rem;min-height:120px;padding:16px;resize:vertical;transition:border-color .2s;width:100%}.open-answer:focus{border-color:var(--primary-color);outline:none}.navigation-buttons{border-top:2px solid var(--border-color);display:flex;gap:12px;justify-content:space-between;padding-top:24px}.navigation-buttons .btn{min-width:140px}.submit-btn{background:linear-gradient(135deg,var(--success-color),#4ade80)}.submit-btn:hover{background:linear-gradient(135deg,#059669,var(--success-color))}.question-nav-grid{grid-gap:8px;background:var(--bg-primary);border-radius:12px;box-shadow:var(--shadow-md);display:grid;gap:8px;grid-template-columns:repeat(auto-fill,minmax(50px,1fr));padding:20px}.question-nav-btn{background:var(--bg-secondary);border:2px solid var(--border-color);border-radius:8px;color:var(--text-primary);cursor:pointer;font-weight:600;padding:12px;transition:all .2s}.question-nav-btn:hover{border-color:var(--primary-light);transform:translateY(-2px)}.question-nav-btn.active{background:linear-gradient(135deg,var(--primary-color),var(--primary-light));border-color:var(--primary-color);color:#fff}.question-nav-btn.answered{background:var(--success-color);border-color:var(--success-color);color:#fff}.question-nav-btn.answered.active{background:linear-gradient(135deg,var(--primary-color),var(--primary-light));border-color:var(--primary-color)}.error-box{background:var(--bg-primary);border-radius:12px;box-shadow:var(--shadow-md);padding:60px 20px;text-align:center}.error-box i{color:var(--danger-color);font-size:4rem;margin-bottom:20px}.error-box p{color:var(--text-primary);font-size:1.25rem;margin-bottom:24px}@media (max-width:768px){.take-exam-page{padding:88px 10px 40px}.exam-container{max-width:100%;padding:0 10px}.exam-header-bar{padding:16px}.exam-info 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