.app{height:calc(100vh - 48px);margin-top:48px;display:flex;flex-direction:column;overflow:hidden}.app-header{background:var(--color-surface);padding:16px 24px;border-bottom:1px solid var(--color-border);box-shadow:var(--shadow-sm)}.app-header h1{font-size:1.5rem;font-weight:600;margin-bottom:2px}.app-subtitle{font-size:.875rem;color:var(--color-text-secondary)}.app-main{flex:1;display:flex;flex-direction:column;min-height:0}.welcome-screen{flex:1;min-height:0;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:48px 24px;gap:32px;overflow:auto}.file-drop-zone{width:100%;max-width:480px;min-height:200px;border:2px dashed var(--color-border);border-radius:var(--radius-lg);background:var(--color-surface);display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .2s ease}.file-drop-zone:hover:not(.disabled){border-color:var(--color-primary);background:var(--color-info-bg)}.file-drop-zone.dragging{border-color:var(--color-primary);background:var(--color-info-bg);transform:scale(1.02)}.file-drop-zone.disabled{opacity:.5;cursor:not-allowed}.drop-zone-content{text-align:center;padding:24px}.drop-zone-icon{font-size:3rem;margin-bottom:16px}.drop-zone-text{font-size:1rem;font-weight:500;margin-bottom:8px}.drop-zone-hint{font-size:.875rem;color:var(--color-text-secondary)}.welcome-info{width:100%;max-width:480px;background:var(--color-surface);padding:24px;border-radius:var(--radius-lg);box-shadow:var(--shadow-sm)}.welcome-info h2{font-size:1.125rem;margin-bottom:12px}.welcome-info ol{margin-left:24px;margin-bottom:16px}.welcome-info li{margin-bottom:8px}.privacy-note{font-size:.875rem;color:var(--color-text-secondary);background:var(--color-info-bg);padding:12px;border-radius:var(--radius-md)}.editor-screen{display:flex;flex-direction:column;flex:1;min-height:0;overflow:hidden}.editor-header{display:flex;justify-content:space-between;align-items:center;padding:12px 24px;background:var(--color-surface);border-bottom:1px solid var(--color-border);flex-wrap:wrap;gap:12px}.file-info{display:flex;align-items:center;gap:16px;flex-wrap:wrap}.file-name{font-weight:600}.file-encoding,.file-size{font-size:.875rem;color:var(--color-text-secondary);background:var(--color-bg);padding:4px 8px;border-radius:var(--radius-sm)}.editor-body{flex:1;display:flex;min-height:0;overflow:hidden}.checklist-sidebar{width:320px;min-width:280px;border-right:1px solid 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h3{font-size:1.125rem;margin-bottom:4px}.fix-description{font-size:.875rem;color:var(--color-text-secondary)}.fix-preview-comparison{flex:1;display:flex;overflow:hidden;min-height:300px}.fix-preview-before,.fix-preview-after{flex:1;display:flex;flex-direction:column;overflow:hidden}.fix-preview-before h4,.fix-preview-after h4{padding:12px 16px 4px;font-size:.875rem}.fix-preview-stats{padding:0 16px 8px;font-size:.75rem;color:var(--color-text-secondary)}.fix-diff{color:var(--color-error);margin-left:8px}.fix-preview-before .data-grid-container,.fix-preview-after .data-grid-container{flex:1;overflow:auto;max-height:300px}.fix-preview-arrow{display:flex;align-items:center;justify-content:center;padding:0 16px;font-size:1.5rem;color:var(--color-text-secondary)}.fix-preview-actions{display:flex;justify-content:flex-end;gap:12px;padding:16px 24px;border-top:1px solid var(--color-border)}.cancel-button{padding:10px 20px;background:var(--color-bg);border:1px solid 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.checklist-item-number{background:var(--color-warning)}.checklist-item-content{flex:1;min-width:0}.checklist-item-header{display:flex;justify-content:space-between;align-items:center;gap:8px;margin-bottom:2px}.checklist-item-name{font-size:.8125rem;font-weight:500;line-height:1.3;min-width:0;word-break:keep-all;overflow-wrap:anywhere}.checklist-item-status{flex-shrink:0;font-size:.6875rem;font-weight:600;padding:2px 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.checklist-item-number{background:var(--color-text-secondary)}.checklist-item-status.status-pending-encoding{color:var(--color-text-secondary);font-size:.625rem}.export-button.encoding-blocked{background:var(--color-text-secondary);cursor:not-allowed}.export-button.encoding-blocked:hover{background:var(--color-text-secondary)}.encoding-notice-primary{padding:10px 16px;background:var(--color-primary);color:#fff;border:none;border-radius:var(--radius-sm);font-size:.875rem;font-weight:500;cursor:pointer}.encoding-notice-primary:hover{background:var(--color-primary-hover)}:root{--color-bg: #f5f5f7;--color-surface: #ffffff;--color-border: #e0e0e0;--color-text: #1d1d1f;--color-text-secondary: #6e6e73;--color-primary: #0071e3;--color-primary-hover: #0077ed;--color-error: #ff3b30;--color-error-bg: #fff5f5;--color-warning: #ff9500;--color-warning-bg: #fff9e6;--color-info: #007aff;--color-info-bg: #e6f2ff;--color-highlight: #ffff99;--color-preview: #e6fff2;--radius-sm: 4px;--radius-md: 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