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32px;background:linear-gradient(135deg,#0277bd,#01579b);color:#fff;border:none;border-radius:12px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .3s ease;box-shadow:0 4px 12px #01579b4d}.modern-upload-button:hover{transform:translateY(-2px);box-shadow:0 6px 20px #01579b66;background:linear-gradient(135deg,#01579b,#014a7d)}.file-selected{display:inline-flex;align-items:center;gap:8px;margin-top:20px;padding:12px 20px;background:#f0fff4;color:#38a169;border-radius:8px;font-weight:500}@keyframes fadeInDown{0%{opacity:0;transform:translateY(-20px)}to{opacity:1;transform:translateY(0)}}@keyframes fadeInUp{0%{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}@keyframes scaleIn{0%{transform:scale(0)}to{transform:scale(1)}}@keyframes 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0}.divider:before,.divider:after{content:"";flex:1;border-bottom:2px solid rgba(255,255,255,.3)}.divider span{padding:0 20px;color:#fff;font-weight:600;font-size:1.1rem;text-shadow:2px 2px 4px rgba(0,0,0,.2)}.upload-area{background:#fff;border:3px dashed #cbd5e0;border-radius:20px;padding:60px 40px;text-align:center;transition:all .3s ease;cursor:pointer}.upload-area:hover{border-color:#0288d1;transform:translateY(-2px);box-shadow:0 10px 30px #0000001a}.upload-area.dragging{border-color:#0288d1;background:#f7fafc;transform:scale(1.02)}.upload-area.processing{pointer-events:none;opacity:.7}.upload-icon{font-size:4rem;color:#0288d1;margin-bottom:20px}.upload-area h2{font-size:1.5rem;color:#2d3748;margin-bottom:10px}.upload-area p{color:#718096;margin-bottom:20px}.upload-button{display:inline-block;background:linear-gradient(135deg,#0288d1,#0277bd);color:#fff;padding:12px 30px;border-radius:8px;cursor:pointer;font-size:1rem;font-weight:600;transition:transform .2s 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#0003}.quiz-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:30px;padding-bottom:20px;border-bottom:2px solid #e2e8f0;flex-wrap:wrap;gap:15px}.quiz-header-left{display:flex;gap:10px;align-items:center}.back-button{background:#f7fafc;border:1px solid #e2e8f0;padding:10px 20px;border-radius:8px;cursor:pointer;font-size:1rem;transition:all .2s}.back-button:hover{background:#e2e8f0}.reset-button{display:flex;align-items:center;gap:6px;background:linear-gradient(135deg,#f59e0b,#d97706);color:#fff;border:none;padding:10px 20px;border-radius:8px;cursor:pointer;font-size:1rem;font-weight:500;transition:all .2s;box-shadow:0 2px 8px #f59e0b33}.reset-button:hover{background:linear-gradient(135deg,#d97706,#b45309);transform:translateY(-2px);box-shadow:0 4px 12px #f59e0b4d}.quiz-progress{display:flex;gap:20px;align-items:center;flex:1;justify-content:center}.progress-text{font-size:1.2rem;font-weight:600;color:#2d3748}.answered-count{background:#0288d1;color:#fff;padding:6px 15px;border-radius:20px;font-size:.9rem}.timer-display{display:flex;align-items:center;gap:8px;padding:10px 20px;border-radius:10px;font-size:1.3rem;font-weight:700;transition:all .3s ease;box-shadow:0 2px 8px #0000001a}.timer-display.normal{background:linear-gradient(135deg,#10b981,#059669);color:#fff}.timer-display.warning{background:linear-gradient(135deg,#f59e0b,#d97706);color:#fff;animation:pulse 2s ease-in-out infinite}.timer-display.critical{background:linear-gradient(135deg,#ef4444,#dc2626);color:#fff;animation:pulse 1s ease-in-out infinite}@keyframes pulse{0%,to{transform:scale(1);box-shadow:0 2px 8px #0000001a}50%{transform:scale(1.05);box-shadow:0 4px 16px #0003}}.timer-icon{font-size:1.2rem}.timer-text{font-family:Courier 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.2s;font-size:.95rem;text-align:center;aspect-ratio:1;display:flex;align-items:center;justify-content:center}.question-number:hover{border-color:#0288d1;transform:scale(1.05)}.question-number.active{background:#0288d1;color:#fff;border-color:#0288d1}.question-number.answered{background:#10b981;color:#fff;border-color:#10b981}.question-number.answered.active{background:#0288d1;border-color:#0288d1}.submit-button-sidebar{width:100%;background:linear-gradient(135deg,#10b981,#059669);color:#fff;border:none;padding:14px 12px;border-radius:10px;font-size:1rem;font-weight:600;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:8px;transition:all .3s ease;margin-top:10px;box-shadow:0 2px 8px #10b98133}.submit-button-sidebar:hover{transform:translateY(-2px);box-shadow:0 6px 20px #10b98166}.question-main{display:flex;flex-direction:column;gap:20px}.question-card{background:#f7fafc;padding:30px;border-radius:15px;animation:fadeInSlide .4s ease-out}@keyframes fadeInSlide{0%{opacity:0;transform:translate(20px)}to{opacity:1;transform:translate(0)}}.question-text{font-size:1.3rem;color:#2d3748;margin-bottom:30px;line-height:1.6}.question-number-badge{display:inline-block;background:#0288d1;color:#fff;padding:5px 15px;border-radius:20px;font-size:.9rem;margin-right:10px}.answers-container{display:flex;flex-direction:column;gap:15px}.answer-option{display:flex;align-items:center;gap:15px;background:#fff;border:2px solid #e2e8f0;padding:20px;border-radius:12px;cursor:pointer;transition:all .2s;text-align:left}.answer-option:hover{border-color:#0288d1;transform:translate(5px);box-shadow:0 4px 12px #667eea33}.answer-option.selected{background:linear-gradient(135deg,#0288d1,#0277bd);border-color:#0288d1;color:#fff}.option-letter{display:flex;align-items:center;justify-content:center;width:40px;height:40px;background:#f7fafc;border-radius:50%;font-weight:700;font-size:1.1rem;color:#0288d1;flex-shrink:0}.answer-option.selected .option-letter{background:#fff;color:#0288d1}.option-text{flex:1;font-size:1rem;line-height:1.5}.check-icon{font-size:1.5rem;color:#fff;flex-shrink:0}.quiz-navigation{display:flex;justify-content:space-between;gap:15px}.nav-button{background:#fff;border:2px solid #e2e8f0;padding:12px 25px;border-radius:8px;cursor:pointer;font-size:1rem;font-weight:600;color:#4a5568;display:flex;align-items:center;gap:8px;transition:all .2s}.nav-button:hover:not(:disabled){border-color:#0288d1;color:#0288d1;transform:translateY(-2px)}.nav-button:disabled{opacity:.5;cursor:not-allowed}.submit-button{background:linear-gradient(135deg,#10b981,#059669);color:#fff;border:none;padding:12px 25px;border-radius:8px;cursor:pointer;font-size:1rem;font-weight:600;display:flex;align-items:center;gap:8px;transition:all .2s}.submit-button:hover{transform:translateY(-2px);box-shadow:0 5px 15px #10b98166}.result-container{background:#fff;border-radius:20px;padding:40px;box-shadow:0 10px 30px #0003}.result-header{text-align:center;margin-bottom:40px}.result-score{display:inline-block;padding:40px;border:5px solid;border-radius:20px;margin-bottom:30px}.score-emoji{font-size:4rem;margin-bottom:15px}.score-title{font-size:2rem;margin-bottom:20px}.score-number{font-size:3rem;font-weight:700;color:#2d3748;margin-bottom:10px}.score-percentage{font-size:1.5rem;color:#718096}.time-info{background:#f7fafc;padding:20px 30px;border-radius:15px;margin-bottom:20px;display:flex;flex-direction:column;align-items:center;gap:10px;border:2px solid #e2e8f0}.time-icon{font-size:2rem;color:#0288d1}.time-details{display:flex;flex-direction:column;align-items:center;gap:5px}.time-label{color:#718096;font-size:.95rem;font-weight:500}.time-value{color:#2d3748;font-size:1.5rem;font-weight:700;font-family:Courier New,monospace}.auto-submit-notice{background:#fee2e2;color:#dc2626;padding:10px 20px;border-radius:8px;font-size:.9rem;font-weight:600;border:1px solid #fecaca;margin-top:5px}.result-actions{display:flex;gap:15px;justify-content:center}.action-button{display:flex;align-items:center;gap:8px;padding:12px 30px;border:none;border-radius:8px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .2s}.action-button.retry{background:linear-gradient(135deg,#0288d1,#0277bd);color:#fff}.action-button.home{background:linear-gradient(135deg,#10b981,#059669);color:#fff}.action-button.upload{background:#f7fafc;border:2px solid #e2e8f0;color:#4a5568}.action-button:hover{transform:translateY(-2px);box-shadow:0 5px 15px #0003}.result-details{margin-top:40px}.result-details h3{font-size:1.5rem;color:#2d3748;margin-bottom:20px;padding-bottom:10px;border-bottom:2px solid #e2e8f0}.questions-review{display:flex;flex-direction:column;gap:20px}.review-item{background:#f7fafc;padding:25px;border-radius:12px;border-left:5px solid}.review-item.correct{border-left-color:#10b981}.review-item.incorrect{border-left-color:#ef4444}.review-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:15px}.review-number{font-weight:700;color:#2d3748;font-size:1.1rem}.icon-correct{color:#10b981;font-size:1.5rem}.icon-incorrect{color:#ef4444;font-size:1.5rem}.review-question{font-size:1.1rem;color:#2d3748;margin-bottom:15px;font-weight:500;line-height:1.6}.review-answers{display:flex;flex-direction:column;gap:10px;margin-bottom:15px}.review-option{display:flex;align-items:center;gap:12px;background:#fff;padding:12px 15px;border-radius:8px;border:2px solid transparent}.review-option.correct-answer{border-color:#10b981;background:#d1fae5}.review-option.wrong-answer{border-color:#ef4444;background:#fee2e2}.review-option 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