:root{--primary: #4f46e5;--primary-hover: #4338ca;--primary-light: #eef2ff;--primary-border: #c7d2fe;--primary-dark: #3730a3;--accent: #06b6d4;--accent-hover: #0891b2;--accent-soft: #e0f2fe;--success: #10b981;--success-bg: #ecfdf5;--success-border: #a7f3d0;--danger: #ef4444;--danger-bg: #fef2f2;--danger-border: #fecaca;--warning: #f59e0b;--warning-bg: #fffbeb;--warning-border: #fde68a;--diff-add-bg: #ecfdf5;--diff-add-border: #10b981;--diff-add-text: #065f46;--diff-add-word: #bbf7d0;--diff-add-highlight: #bbf7d0;--diff-del-bg: #fef2f2;--diff-del-border: #ef4444;--diff-del-text: #991b1b;--diff-del-word: #fecdd3;--diff-del-highlight: #fecdd3;--bg-page: #f8fafc;--bg-card: #ffffff;--bg-card-hover: #f1f5f9;--bg-subtle: #f8fafc;--bg: #f8fafc;--surface: #ffffff;--surface-2: #f8fafc;--surface-3: #f1f5f9;--surface-card: #ffffff;--border: #e2e8f0;--border-strong: #cbd5e1;--border-focus: #4f46e5;--text-primary: #0f172a;--text-secondary: #475569;--text-muted: #64748b;--text-faint: #94a3b8;--text: #0f172a;--space-1: 4px;--space-2: 8px;--space-3: 12px;--space-4: 16px;--space-5: 24px;--space-6: 32px;--space-7: 48px;--space-8: 64px;--radius-xs: 4px;--radius-sm: 8px;--radius: 12px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 20px;--radius-full: 9999px;--shadow-xs: 0 1px 2px rgba(15, 23, 42, .04);--shadow-sm: 0 1px 3px rgba(15, 23, 42, .06), 0 1px 2px rgba(15, 23, 42, .04);--shadow-md: 0 4px 6px -1px rgba(15, 23, 42, .07), 0 2px 4px -2px rgba(15, 23, 42, .05);--shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, .08), 0 4px 6px -4px rgba(15, 23, 42, .04);--shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, .08), 0 8px 10px -6px rgba(15, 23, 42, .04);--transition-fast: .15s cubic-bezier(.4, 0, .2, 1);--transition-normal: .25s cubic-bezier(.4, 0, .2, 1);--max-width: 960px;--header-height: 64px;--font-sans: "Plus Jakarta Sans", "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;--font-mono: "JetBrains Mono", "SF Mono", "Fira Code", Menlo, Consolas, monospace}.studio-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);overflow:hidden}.input-studio-card{margin-bottom:24px;position:relative}.diff-stage-card{margin-bottom:48px;position:relative;transition:all var(--transition-fast)}.diff-toolbar{padding:10px 16px;background:#fbfcfd;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px}.toolbar-left{display:flex;align-items:center;flex-wrap:wrap;gap:12px}.toolbar-divider{height:20px;width:1px;background:var(--border);margin:0 2px}@media(max-width:768px){.toolbar-divider{display:none}}.toolbar-options{display:flex;align-items:center;gap:14px;flex-wrap:wrap}.toolbar-right{display:flex;align-items:center;gap:8px;flex-shrink:0}.segmented-control{display:inline-flex;background:var(--surface-3);padding:3px;border-radius:var(--radius-sm);border:1px solid var(--border);max-width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch;scrollbar-width:none;flex-shrink:0}.segmented-control::-webkit-scrollbar{display:none}.segmented-btn{background:transparent;border:none;font-family:var(--font-sans);font-size:.8rem;font-weight:600;color:var(--text-secondary);padding:5px 12px;border-radius:var(--radius-xs);cursor:pointer;display:inline-flex;align-items:center;gap:6px;transition:all var(--transition-fast);white-space:nowrap;flex-shrink:0}.segmented-btn:hover{color:var(--text-primary)}.segmented-btn.active{background:#fff;color:var(--primary);box-shadow:var(--shadow-xs);font-weight:700}.checkbox-label{display:inline-flex;align-items:center;gap:6px;font-size:.8rem;font-weight:600;color:var(--text-secondary);cursor:pointer;-webkit-user-select:none;user-select:none;white-space:nowrap;flex-shrink:0}.checkbox-label input[type=checkbox]{accent-color:var(--primary);width:15px;height:15px;cursor:pointer}.btn-tool-secondary{background:#fff;color:var(--text-secondary);border:1px solid var(--border);font-family:var(--font-sans);font-size:.8rem;font-weight:600;padding:5px 12px;border-radius:var(--radius-sm);cursor:pointer;display:inline-flex;align-items:center;gap:6px;transition:all var(--transition-fast);white-space:nowrap;box-shadow:var(--shadow-xs)}.btn-tool-secondary:hover{background:var(--surface-2);color:var(--text-primary);border-color:var(--border-strong)}.btn-action-fullscreen{background:var(--primary);color:#fff;border:1px solid var(--primary-hover);font-family:var(--font-sans);font-size:.8rem;font-weight:700;padding:5px 13px;border-radius:var(--radius-sm);cursor:pointer;display:inline-flex;align-items:center;gap:6px;transition:all var(--transition-fast);white-space:nowrap;box-shadow:0 1px 3px #4f46e540}.btn-action-fullscreen:hover{background:var(--primary-hover);box-shadow:0 3px 8px #4f46e559}.diff-input-grid{display:grid;grid-template-columns:1fr;background:var(--border);gap:1px;position:relative}@media(min-width:768px){.diff-input-grid{grid-template-columns:1fr 1fr}}.mobile-input-tabs{display:none}@media(max-width:768px){.mobile-input-tabs{display:flex;align-items:center;background:#f1f5f9;padding:5px;border-bottom:1px solid var(--border);gap:6px}.mobile-tab-btn{flex:1;display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:8px 10px;background:transparent;border:none;border-radius:var(--radius-xs);font-family:var(--font-sans);font-size:.82rem;font-weight:600;color:var(--text-secondary);cursor:pointer;transition:all var(--transition-fast)}.mobile-tab-btn:hover{color:var(--text-primary)}.mobile-tab-btn.active{background:#fff;color:var(--primary);font-weight:700;box-shadow:0 1px 3px #0f172a14}.tab-badge-pill{width:18px;height:18px;border-radius:50%;background:var(--primary-light);color:var(--primary);font-size:.65rem;font-weight:800;display:inline-flex;align-items:center;justify-content:center}.tab-badge-pill.tab-badge-mod{background:#e0f2fe;color:#0284c7}.tab-status-dot{width:7px;height:7px;border-radius:50%;background:#10b981;display:inline-block}.diff-input-grid.mobile-show-orig #pane-orig{display:flex!important}.diff-input-grid.mobile-show-orig #pane-mod,.diff-input-grid.mobile-show-mod #pane-orig{display:none!important}.diff-input-grid.mobile-show-mod #pane-mod,.diff-input-grid.mobile-show-both #pane-orig,.diff-input-grid.mobile-show-both #pane-mod{display:flex!important}}.center-swap-btn{display:none}@media(min-width:768px){.center-swap-btn{display:flex;align-items:center;justify-content:center;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:32px;height:32px;border-radius:50%;background:#fff;border:1px solid var(--border);box-shadow:0 2px 8px #0f172a1a;color:var(--text-secondary);cursor:pointer;z-index:10;transition:all .2s cubic-bezier(.4,0,.2,1)}.center-swap-btn:hover{background:var(--primary);color:#fff;border-color:var(--primary);transform:translate(-50%,-50%) rotate(180deg);box-shadow:0 4px 12px #4f46e54d}}.input-pane{background:#fff;display:flex;flex-direction:column;min-height:270px;position:relative}.pane-header{padding:8px 14px;min-height:42px;background:#fbfcfd;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;gap:8px;width:100%}.pane-title-area{display:flex;align-items:center;gap:8px;min-width:0;flex:1;overflow:hidden}.pane-badge{font-size:.65rem;font-weight:800;color:var(--primary);background:var(--primary-light);padding:2px 7px;border-radius:4px;letter-spacing:.05em;flex-shrink:0}.pane-badge-mod{color:#0284c7;background:#e0f2fe}.pane-title{font-size:.8rem;font-weight:700;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.file-chip{display:inline-flex;align-items:center;gap:5px;background:var(--primary-light);color:var(--primary);border:1px solid var(--primary-border);padding:2px 8px;border-radius:4px;font-size:.72rem;font-weight:600;max-width:170px;overflow:hidden}.file-chip-name{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.file-chip-remove{background:transparent;border:none;color:var(--primary);cursor:pointer;font-size:.7rem;font-weight:700;padding:0 2px;line-height:1;border-radius:2px}.file-chip-remove:hover{background:#4f46e526}.pane-actions{display:flex;align-items:center;gap:6px;flex-shrink:0}.pane-btn-file{background:#fff;color:var(--text-secondary);border:1px solid var(--primary);font-size:.76rem;font-weight:600;padding:4px 10px;border-radius:6px;cursor:pointer;display:inline-flex;align-items:center;gap:5px;transition:all var(--transition-fast);box-shadow:var(--shadow-xs);white-space:nowrap}.pane-btn-file:hover{background:var(--primary-light);border-color:var(--primary-hover);color:var(--primary)}.pane-btn-icon{background:transparent;border:1px solid transparent;color:var(--text-muted);width:28px;height:28px;display:inline-flex;align-items:center;justify-content:center;border-radius:6px;cursor:pointer;transition:all var(--transition-fast)}.pane-btn-icon:hover{color:var(--danger);background:var(--danger-bg);border-color:var(--danger-border)}.pane-textarea-wrap{position:relative;flex:1;display:flex;flex-direction:column}.diff-textarea{flex:1;width:100%;min-height:240px;padding:14px 16px;border:none;outline:none;resize:vertical;font-family:var(--font-mono);font-size:.85rem;line-height:1.6;color:var(--text-primary);background:#fff;-moz-tab-size:2;tab-size:2;white-space:pre}.diff-textarea:focus{background:#fafafa}.diff-textarea::placeholder{white-space:pre-line;color:var(--text-tertiary);line-height:1.5}.drop-overlay{position:absolute;top:0;left:0;right:0;bottom:0;background:#eef2fff0;border:2px dashed var(--primary);display:none;align-items:center;justify-content:center;flex-direction:column;gap:8px;color:var(--primary);font-weight:700;font-size:.95rem;z-index:10;pointer-events:none}.input-pane.drag-active .drop-overlay{display:flex}.pane-loading-overlay{position:absolute;top:0;left:0;right:0;bottom:0;background:#ffffffeb;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);display:none;align-items:center;justify-content:center;flex-direction:column;gap:12px;color:var(--primary);font-weight:700;font-size:.9rem;z-index:15}.pane-loading-overlay.active{display:flex}.loading-spinner{width:26px;height:26px;border:3px solid var(--primary-light);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.mobile-next-step-prompt{background:#f8fafc;border-top:1px dashed var(--border);padding:10px 14px}.next-step-content{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap}.next-step-text{display:inline-flex;align-items:center;gap:6px;font-size:.78rem;font-weight:600;color:var(--text-primary)}.next-step-text svg{color:#10b981;flex-shrink:0}.btn-next-step-action{background:var(--primary);color:#fff;border:1px solid var(--primary-hover);padding:6px 14px;font-size:.78rem;font-weight:700;border-radius:var(--radius-xs);cursor:pointer;display:inline-flex;align-items:center;gap:6px;box-shadow:0 1px 3px #4f46e533;transition:all var(--transition-fast);white-space:nowrap}.btn-next-step-action:hover{background:var(--primary-hover);transform:translateY(-1px)}@media(max-width:640px){.next-step-content{flex-direction:column;align-items:stretch}.btn-next-step-action{width:100%;justify-content:center;padding:8px 12px}}.diff-stage-header{padding:10px 18px;background:#fbfcfd;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px}.diff-header-left{display:flex;align-items:center;flex-wrap:wrap;gap:12px}.diff-header-center{display:flex;align-items:center;justify-content:center;gap:10px;flex-wrap:wrap}.diff-header-right{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.stats-badges{display:flex;align-items:center;flex-wrap:wrap;gap:8px}.stat-pill{display:inline-flex;align-items:center;gap:5px;font-size:.78rem;font-weight:700;padding:3px 10px;border-radius:var(--radius-full)}.stat-match{background:var(--primary-light);color:var(--primary);border:1px solid var(--primary-border)}.stat-match.stat-match-high{background:#ecfdf5;color:#065f46;border-color:#a7f3d0}.stat-match.stat-match-med{background:#fffbeb;color:#92400e;border-color:#fde68a}.stat-match.stat-match-low{background:#fef2f2;color:#991b1b;border-color:#fecaca}.stat-add{background:var(--success-bg);color:var(--diff-add-text);border:1px solid var(--success-border)}.stat-del{background:var(--danger-bg);color:var(--diff-del-text);border:1px solid var(--danger-border)}.stat-equal{background:var(--surface-3);color:var(--text-secondary);border:1px solid var(--border)}.diff-nav-controls{display:inline-flex;align-items:center;gap:2px;background:#fff;border:1px solid var(--border);border-radius:var(--radius-full);padding:2px 4px;box-shadow:var(--shadow-xs)}.btn-diff-nav{background:transparent;border:none;color:var(--text-secondary);width:24px;height:24px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;cursor:pointer;transition:all var(--transition-fast);padding:0}.btn-diff-nav:hover:not(:disabled){background:var(--surface-3);color:var(--text-primary)}.btn-diff-nav:disabled{opacity:.35;cursor:not-allowed}.diff-counter-pill{font-family:var(--font-mono);font-size:.76rem;font-weight:700;color:var(--text-secondary);padding:0 6px;-webkit-user-select:none;user-select:none;min-width:44px;text-align:center}.empty-diff-stage{padding:56px 24px;text-align:center;display:flex;flex-direction:column;align-items:center;justify-content:center;background:#fff}.empty-icon-pill{width:54px;height:54px;border-radius:16px;background:var(--primary-light);border:1px solid var(--primary-border);display:flex;align-items:center;justify-content:center;color:var(--primary);margin-bottom:16px;box-shadow:0 2px 6px #4f46e514}.empty-stage-title{font-size:1.05rem;font-weight:700;color:var(--text-primary);margin-bottom:6px}.empty-stage-subtitle{font-size:.88rem;color:var(--text-secondary);max-width:480px;line-height:1.55;margin:0 auto 20px}.btn-empty-sample{background:var(--surface-2);color:var(--primary);border:1px solid var(--primary-border);font-family:var(--font-sans);font-size:.82rem;font-weight:700;padding:7px 16px;border-radius:var(--radius-sm);cursor:pointer;display:inline-flex;align-items:center;gap:7px;transition:all var(--transition-fast);box-shadow:var(--shadow-xs)}.btn-empty-sample:hover{background:var(--primary);color:#fff;border-color:var(--primary);box-shadow:0 3px 8px #4f46e540}.identical-banner{padding:24px;text-align:center;background:var(--success-bg);color:var(--diff-add-text);font-weight:700;font-size:.95rem;display:flex;align-items:center;justify-content:center;gap:8px}.split-diff-view{overflow-y:auto;overflow-x:hidden;max-height:580px;font-family:var(--font-mono);font-size:.82rem;line-height:1.6;background:#fff}.split-diff-row{display:flex;align-items:stretch;min-height:22px;border-bottom:1px solid rgba(0,0,0,.04)}.split-cell{flex:1 1 50%;width:50%;min-width:0;display:flex;align-items:stretch}.split-cell.left{border-right:1px solid var(--border)}@media(max-width:767px){.split-diff-view{overflow-x:auto}.split-diff-row{min-width:600px}}.split-diff-grid{display:grid;grid-template-columns:1fr;background:var(--border);gap:1px}@media(min-width:768px){.split-diff-grid{grid-template-columns:1fr 1fr}}.split-col{background:#fff;overflow-x:auto;overflow-y:auto;max-height:580px;font-family:var(--font-mono);font-size:.82rem;line-height:1.6}.diff-row{display:flex;align-items:stretch;min-height:22px}.diff-gutter{width:44px;min-width:44px;padding:0 8px;text-align:right;color:var(--text-faint);background:#f8fafc;border-right:1px solid var(--border);-webkit-user-select:none;user-select:none;font-size:.75rem;line-height:1.6}.diff-prefix{width:20px;min-width:20px;text-align:center;font-weight:700;-webkit-user-select:none;user-select:none;color:var(--text-faint);line-height:1.6}.diff-content{flex:1;padding:0 8px;line-height:1.6;min-width:0}.diff-wrap-lines .diff-content{white-space:pre-wrap;word-break:break-word;overflow-wrap:anywhere}.diff-nowrap .diff-content{white-space:pre;overflow-x:visible}.diff-nowrap .split-diff-view{overflow-x:auto}.diff-nowrap .split-diff-row{width:max-content;min-width:100%}.diff-nowrap .split-cell{min-width:380px}.diff-wrap-lines .diff-textarea{white-space:pre-wrap;word-break:break-word}.diff-row-added{background:var(--diff-add-bg);color:var(--diff-add-text)}.diff-row-added .diff-gutter{background:#ecfdf5;color:var(--diff-add-text)}.diff-row-added .diff-prefix{color:var(--diff-add-text)}.diff-row-removed{background:var(--diff-del-bg);color:var(--diff-del-text)}.diff-row-removed .diff-gutter{background:#fef2f2;color:var(--diff-del-text)}.diff-row-removed .diff-prefix{color:var(--diff-del-text)}.diff-row-empty{background:#f8fafc}.diff-row-empty .diff-gutter{background:#f1f5f9}.diff-word-add{background-color:var(--diff-add-highlight, #bbf7d0);color:var(--diff-add-text, #065f46);border-radius:3px;padding:1px 4px;margin:0 1px;font-weight:600;border-bottom:1.5px solid #10b981}.diff-word-del{background-color:var(--diff-del-highlight, #fecdd3);color:var(--diff-del-text, #991b1b);border-radius:3px;padding:1px 4px;margin:0 1px;font-weight:600;text-decoration:line-through;border-bottom:1.5px solid #ef4444}.inline-flow-view{padding:24px 28px;font-family:var(--font-mono);font-size:.92rem;line-height:1.9;white-space:pre-wrap;word-break:normal;overflow-wrap:anywhere;background:#fff;color:var(--text-primary);max-height:580px;overflow-y:auto}@keyframes diffFocusPulse{0%{box-shadow:0 0 #4f46e573}to{box-shadow:0 0 0 5px #4f46e51f}}.diff-active-focus{position:relative;z-index:5}span.diff-word-add.diff-active-focus,span.diff-word-del.diff-active-focus{outline:2.5px solid var(--primary);outline-offset:2px;border-radius:4px;animation:diffFocusPulse 1.2s ease-in-out infinite alternate}.split-diff-row.diff-active-focus,.diff-row.diff-active-focus{background:#6366f114!important;outline:2px solid var(--primary);outline-offset:-2px}.diff-redline-active .diff-word-del{text-decoration:line-through;text-decoration-color:#dc2626;text-decoration-thickness:2px;color:#991b1b;background-color:#fee2e28c;border-bottom:none}.diff-redline-active .diff-word-add{text-decoration:underline;text-decoration-color:#059669;text-decoration-thickness:2px;color:#065f46;background-color:#d1fae58c;border-bottom:none}.diff-redline-active .diff-row-removed .diff-content{text-decoration:line-through;text-decoration-color:#dc2626}.diff-redline-active .diff-row-added .diff-content{text-decoration:underline;text-decoration-color:#059669}.segmented-control.is-disabled{opacity:.45;cursor:not-allowed}.segmented-control.is-disabled .segmented-btn{pointer-events:none;cursor:not-allowed}.checkbox-label.is-disabled{opacity:.45;cursor:not-allowed;pointer-events:none}.unified-diff-view{overflow-x:auto;overflow-y:auto;max-height:580px;font-family:var(--font-mono);font-size:.82rem;line-height:1.6}.unified-gutter-a,.unified-gutter-b{width:42px;min-width:42px;padding:0 6px;text-align:right;color:var(--text-faint);background:#f8fafc;-webkit-user-select:none;user-select:none;font-size:.75rem;line-height:1.6}.unified-gutter-b{border-right:1px solid var(--border)}.diff-stage-body{display:flex;position:relative;min-height:480px;overflow:hidden;background:#fff}#diff-viewport{flex:1;min-width:0;display:flex;flex-direction:column}.diff-mode-doc-sheet #diff-viewport{background:#f1f5f9;padding:32px 20px}.diff-mode-doc-sheet .inline-flow-view{background:#fff;max-width:840px;margin:0 auto;padding:56px 64px;border-radius:4px;box-shadow:0 4px 20px #00000014,0 1px 3px #00000008;font-family:Georgia,Times New 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