body{margin:0;font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:#f5f5f5}.app-container{max-width:1200px;margin:0 auto;padding:24px;background:#fff;min-height:100vh}.table{width:100%;border-collapse:collapse;font-size:13px}.table th,.table td{border:1px solid #ddd;padding:4px 6px;text-align:center}.table thead{background:#fafafa}.error-msg{color:#d93025;margin-bottom:8px}.highlight-cell{border:2px solid #d93025!important;background:#ffecec}.toolbar{display:flex;gap:8px;align-items:center;margin-bottom:12px;flex-wrap:wrap}button{cursor:pointer}