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var(--transition-fast)}.preview-close:hover{background:var(--accent-error);color:#fff}.preview-modal-content{flex:1;overflow-y:auto;padding:24px}.preview-empty{display:flex;align-items:center;justify-content:center;height:200px;color:var(--text-secondary)}.preview-questions-list{display:flex;flex-direction:column;gap:24px}.preview-question-container{background:var(--bg-secondary);border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--border-color)}.preview-question-header{display:flex;align-items:center;gap:12px;padding:12px 16px;background:var(--bg-tertiary);border-bottom:1px solid var(--border-color)}.preview-question-number{font-weight:600;color:var(--text-primary)}.preview-question-id{font-family:monospace;font-size:var(--font-sm);color:var(--text-secondary)}.preview-question-type{margin-left:auto;background:var(--accent-primary);color:#fff;padding:2px 8px;border-radius:4px;font-size:10px;font-weight:600}.preview-mode-selector{display:flex;background:var(--bg-tertiary);padding:2px;border-radius:var(--radius-md);margin-left:20px}.mode-btn{padding:6px 16px;border:none;background:transparent;color:var(--text-secondary);border-radius:var(--radius-sm);font-size:var(--font-sm);font-weight:500;cursor:pointer;transition:all var(--transition-fast)}.mode-btn.active{background:var(--bg-primary);color:var(--accent-primary);box-shadow:0 2px 8px #0003}.raw-json-view{margin:0;padding:24px;background:#0d1117;color:#e6edf3;font-family:JetBrains Mono,Fira 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slideUp{0%{transform:translateY(30px);opacity:0}to{transform:translateY(0);opacity:1}}.validation-modal-header{display:flex;align-items:center;justify-content:space-between;padding:20px 24px;background:var(--bg-secondary);border-bottom:1px solid var(--border-color)}.validation-modal-header h2{font-size:var(--font-xl);font-weight:600;margin:0}.validation-close{width:36px;height:36px;border:none;background:var(--bg-tertiary);color:var(--text-secondary);border-radius:50%;cursor:pointer;font-size:20px;display:flex;align-items:center;justify-content:center;transition:all var(--transition-fast)}.validation-close:hover{background:var(--accent-error);color:#fff}.validation-modal-content{flex:1;overflow-y:auto;padding:24px}.validation-start{text-align:center;padding:20px 0}.validation-start p{font-size:var(--font-lg);margin-bottom:8px}.validation-hint{color:var(--text-secondary);font-size:var(--font-sm)!important;margin-bottom:24px!important}.validation-actions{display:flex;gap:12px;justify-content:center;margin-top:20px}.btn-validate,.btn-export{padding:12px 24px;background:linear-gradient(135deg,var(--accent-primary) 0%,#a371f7 100%);color:#fff;border:none;border-radius:var(--radius-md);font-size:var(--font-md);font-weight:600;cursor:pointer;transition:all var(--transition-fast)}.btn-validate:hover,.btn-export:hover{transform:translateY(-2px);box-shadow:0 8px 20px #58a6ff4d}.btn-validate:disabled{opacity:.7;cursor:not-allowed;transform:none}.btn-skip,.btn-cancel{padding:12px 24px;background:var(--bg-tertiary);color:var(--text-secondary);border:1px solid var(--border-color);border-radius:var(--radius-md);font-size:var(--font-md);cursor:pointer;transition:all var(--transition-fast)}.btn-skip:hover,.btn-cancel:hover{background:var(--bg-secondary);color:var(--text-primary)}.validation-results{display:flex;flex-direction:column;gap:16px}.validation-summary{display:flex;align-items:center;gap:12px;padding:16px;border-radius:var(--radius-md);font-weight:600}.validation-summary.success{background:#3fb9501a;border:1px solid var(--accent-success);color:var(--accent-success)}.validation-summary.error{background:#f851491a;border:1px solid var(--accent-error);color:var(--accent-error)}.summary-icon{font-size:24px}.validation-list{max-height:300px;overflow-y:auto;display:flex;flex-direction:column;gap:8px}.validation-item{background:var(--bg-secondary);border-radius:var(--radius-md);padding:12px 16px;border-left:3px solid}.validation-item.valid{border-left-color:var(--accent-success)}.validation-item.invalid{border-left-color:var(--accent-error)}.validation-item-header{display:flex;align-items:center;gap:10px}.validation-status{width:20px;height:20px;display:flex;align-items:center;justify-content:center;border-radius:50%;font-size:12px;font-weight:700}.validation-item.valid .validation-status{background:var(--accent-success);color:#fff}.validation-item.invalid .validation-status{background:var(--accent-error);color:#fff}.validation-filename{font-weight:500}.validation-id{font-family:monospace;font-size:var(--font-sm);color:var(--text-secondary);margin-left:auto}.validation-errors{margin:10px 0 0 30px;padding:0;list-style:none}.validation-errors li{padding:4px 0;font-size:var(--font-sm);color:var(--accent-error)}.validation-errors li:before{content:"→ ";color:var(--accent-error)}.session-recovery-banner{display:flex;align-items:center;gap:16px;background-color:#fff8e1;border:1px solid #ffe082;border-radius:8px;padding:12px 16px;margin:16px;box-shadow:0 2px 4px #0000000d;animation:slideDown .3s ease-out}.banner-icon{font-size:24px}.banner-content{flex:1}.banner-title{margin:0;font-weight:600;color:#856404;font-size:14px}.banner-description{margin:4px 0 0;color:#856404;font-size:13px;opacity:.9}.banner-clear{background:#856404;color:#fff;border:none;padding:6px 12px;border-radius:4px;font-size:12px;font-weight:500;cursor:pointer;transition:background .2s}.banner-clear:hover{background:#6d5203}@keyframes slideDown{0%{transform:translateY(-20px);opacity:0}to{transform:translateY(0);opacity:1}}.update-page{height:100vh;display:flex;flex-direction:column;overflow:hidden}.file-upload.processing{border-style:solid;border-color:var(--accent-primary);cursor:wait}.converter-upload-wrapper{width:100%;display:flex;flex-direction:column;gap:16px}.progress-container-outer{width:100%;padding:20px 24px;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-lg);display:flex;flex-direction:column;gap:12px;animation:slideProgressUp .3s ease-out;box-shadow:var(--shadow-md)}.progress-info-row{display:flex;justify-content:space-between;align-items:center;font-size:13px;font-weight:600}.progress-status-text{color:var(--text-secondary);max-width:75%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.progress-percent{font-size:18px;font-weight:700;color:var(--accent-primary);letter-spacing:-.5px}.progress-track{width:100%;height:12px;background:var(--bg-tertiary);border-radius:6px;overflow:hidden;position:relative;box-shadow:inset 0 2px 4px #0000001a}.progress-bar{height:100%;background:linear-gradient(90deg,#58a6ff 0%,var(--accent-primary) 100%);border-radius:6px;transition:width .5s cubic-bezier(.4,0,.2,1);position:relative}.progress-bar:after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,#fff0,#ffffff59,#fff0);background-size:200% 100%;animation:progressShimmer 1.8s infinite linear}@keyframes progressShimmer{0%{background-position:-200% 0}to{background-position:200% 0}}@keyframes slideProgressUp{0%{transform:translateY(8px);opacity:0}to{transform:translateY(0);opacity:1}}.progress-stats-row{display:flex;flex-wrap:wrap;gap:8px;align-items:center}.progress-stat{display:inline-flex;align-items:center;gap:4px;font-size:12px;color:var(--text-secondary);background:var(--bg-tertiary);border-radius:20px;padding:3px 10px;white-space:nowrap}.stat-icon{font-size:12px}.eta-highlight{background:#d0027f1a;color:var(--accent-primary);font-weight:700;border:1px solid rgba(208,2,127,.25)}.spinner{width:48px;height:48px;border:4px solid var(--border-color);border-top:4px solid var(--accent-primary);border-radius:50%;animation:spin 1s linear infinite}.conversion-sidebyside{margin-top:24px;padding:20px;background:var(--bg-secondary, #161b22);border-radius:var(--radius-lg, 12px);border:1px solid var(--border-color, #30363d);max-height:70vh;overflow-y:auto}.sidebyside-title{margin:0 0 20px;font-size:var(--font-lg, 1.125rem);font-weight:600;color:var(--text-primary, #e6edf3)}.sidebyside-questions-list{display:flex;flex-direction:column;gap:24px}.sidebyside-question-card{background:var(--bg-tertiary, #21262d);border-radius:var(--radius-md, 8px);border:1px solid var(--border-color, #30363d);overflow:hidden}.sidebyside-question-header{display:flex;align-items:center;gap:12px;padding:12px 16px;background:#0003;border-bottom:1px solid var(--border-color, #30363d)}.sidebyside-question-num{font-weight:600;color:var(--text-primary, #e6edf3)}.sidebyside-question-id{font-family:monospace;font-size:var(--font-sm, .875rem);color:var(--text-secondary, #8b949e)}.sidebyside-question-types{margin-left:auto;font-size:var(--font-sm, .875rem);padding:4px 10px;border-radius:6px;background:#58a6ff33;color:#58a6ff}.sidebyside-columns{display:grid;grid-template-columns:1fr 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#30363d)}.sidebyside-col:last-child{border-bottom:none}}.converter-page{flex:1;display:flex;flex-direction:column;overflow:hidden;min-height:calc(100vh - 60px)}.converter-welcome{flex:1;display:flex;align-items:center;justify-content:center;padding:40px}.converter-welcome .welcome-content{max-width:600px;text-align:center}.converter-welcome .welcome-icon{display:inline-flex;align-items:center;justify-content:center;width:120px;height:120px;background:linear-gradient(135deg,#a371f7,#8b5cf6);border-radius:24px;margin-bottom:24px;color:#fff}.converter-welcome .welcome-title{font-size:2rem;font-weight:700;background:linear-gradient(135deg,#a371f7,#8b5cf6);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin-bottom:12px}.converter-welcome .welcome-subtitle{font-size:1.1rem;color:var(--text-secondary);margin-bottom:32px}.converter-header{display:flex;align-items:center;gap:16px;padding:16px 24px;border-bottom:1px solid 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var(--border-color);border-radius:var(--radius-lg);cursor:pointer;transition:all var(--transition-fast);font-size:var(--font-lg);font-weight:600;color:var(--text-secondary)}.mode-btn:hover{border-color:var(--text-muted);background:var(--bg-secondary)}.mode-btn.active{border-color:var(--accent-primary);background:#58a6ff26;color:var(--accent-primary)}.mode-desc{font-size:var(--font-sm);font-weight:400;color:var(--text-muted)}.mode-note{margin:12px 0 0;padding:10px;background:#a371f71a;border-radius:var(--radius-md);color:var(--accent-secondary);font-size:var(--font-sm);text-align:center}.btn-ai-convert{margin-top:16px;width:100%;padding:14px 24px;background:linear-gradient(135deg,#a371f7,#8957e5);border:none;border-radius:var(--radius-md);color:#fff;font-size:var(--font-md);font-weight:600;cursor:pointer;transition:all var(--transition-fast);display:flex;align-items:center;justify-content:center;gap:10px}.btn-ai-convert:hover:not(:disabled){transform:translateY(-2px);box-shadow:0 8px 20px #a371f766}.btn-ai-convert:disabled{opacity:.8;cursor:not-allowed}.loading-spinner{width:18px;height:18px;border:2px solid rgba(255,255,255,.3);border-top-color:#fff;border-radius:50%;animation:spin .8s linear infinite}.status-box.ai{background:#a371f71a;border:1px solid var(--accent-secondary);color:var(--accent-secondary)}.type-display{display:flex;align-items:center;gap:12px;margin-bottom:16px}.type-badge{padding:6px 12px;border-radius:6px;font-size:12px;font-weight:700;color:#fff;text-transform:uppercase}.type-badge.mcq{background:#58a6ff}.type-badge.mrq{background:#a371f7}.type-badge.frq{background:#3fb950}.type-badge.gap{background:#d29922}.type-badge.input{background:#f85149}.type-badge.matching{background:#79c0ff}.type-badge.ordering{background:#ff7b72}.type-badge.gmrq{background:#d2a8ff}.type-badge.counting{background:#56d364}.type-badge.opinion{background:#ffa657}.type-badge.puzzle{background:#ff9bce}.type-badge.string{background:#a5d6ff}.type-name{font-size:var(--font-md);color:var(--text-secondary)}.stem-preview{background:var(--bg-tertiary);border-radius:var(--radius-md);padding:12px}.stem-preview label{font-size:var(--font-sm);color:var(--text-muted);margin-bottom:8px;display:block}.stem-content{color:var(--text-primary);line-height:1.5}.stem-content img{max-width:100%;border-radius:4px}.no-conversions{color:var(--text-muted);font-style:italic}.type-options{display:flex;flex-direction:column;gap:8px}.type-option{display:flex;align-items:center;gap:12px;padding:12px 16px;background:var(--bg-tertiary);border:2px solid var(--border-color);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast);text-align:left}.type-option:hover{border-color:var(--accent-primary)}.type-option.selected{border-color:var(--accent-primary);background:#58a6ff1a}.type-option .type-name{flex:1}.conversion-indicator{font-size:var(--font-sm);padding:4px 8px;border-radius:4px;background:var(--bg-secondary)}.type-option.auto .conversion-indicator{color:var(--accent-success)}.type-option.input .conversion-indicator{color:var(--accent-warning)}.input-section{border:2px solid var(--accent-warning)}.input-panel{margin-bottom:16px}.input-panel p{margin-bottom:12px;color:var(--text-secondary)}.choices-select{display:flex;flex-direction:column;gap:8px}.choice-option{display:flex;align-items:center;gap:12px;padding:12px;background:var(--bg-tertiary);border:1px solid var(--border-color);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast)}.choice-option:hover{border-color:var(--text-muted)}.choice-option.selected{border-color:var(--accent-success);background:#3fb9501a}.choice-option input{cursor:pointer}.choice-label{min-width:30px;font-weight:600;color:var(--text-secondary)}.choice-value{flex:1;color:var(--text-primary)}.btn-preview{padding:10px 20px;background:var(--accent-warning);color:#000;border:none;border-radius:var(--radius-md);font-weight:600;cursor:pointer;transition:all var(--transition-fast)}.btn-preview:hover:not(:disabled){transform:translateY(-2px)}.btn-preview:disabled{opacity:.5;cursor:not-allowed}.status-box{display:flex;align-items:center;gap:12px;padding:16px;border-radius:var(--radius-md);font-weight:500}.converter-mode-toggle{display:flex;gap:12px;justify-content:center;margin-bottom:24px}.mode-toggle-btn{padding:12px 24px;border:2px solid #d0d7de;border-radius:8px;background:#fff;color:#24292f;font-size:14px;font-weight:500;cursor:pointer;transition:all .2s}.mode-toggle-btn:hover{border-color:#0969da;background:#f6f8fa}.mode-toggle-btn.active{border-color:#0969da;background:#0969da;color:#fff}.csv-upload-section{margin-top:24px}.csv-upload-label:hover{border-color:#0969da;background:#f6f8fa}.converter-results-summary{margin-top:24px;padding:20px;background:#f6f8fa;border-radius:8px;border:1px solid #d0d7de}.converter-results-summary h3{margin-top:0;margin-bottom:16px;font-size:18px;font-weight:600;color:#24292f}.converter-results-summary .btn-export,.converter-results-summary .btn-reset{padding:10px 20px;border-radius:var(--radius-md);font-weight:600;cursor:pointer;transition:all var(--transition-fast);margin-right:8px}.converter-results-summary .btn-export{background:var(--accent-success);color:#fff;border:none}.converter-results-summary .btn-export:hover{opacity:.9}.converter-results-summary .btn-reset{background:var(--bg-tertiary);color:var(--text-secondary);border:1px solid var(--border-color)}.converter-results-summary .btn-reset:hover{background:var(--bg-secondary);color:var(--text-primary)}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.status-box.auto{background:#3fb9501a;border:1px solid var(--accent-success);color:var(--accent-success)}.status-box.input{background:#d299221a;border:1px solid var(--accent-warning);color:var(--accent-warning)}.status-icon{font-size:20px}.ready-section{border:2px solid 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