body{font-family:Arial,sans-serif;background:#f5f7fa;margin:0;padding:0;display:flex;justify-content:center;align-items:flex-start;min-height:100vh;color:#333}#app{margin-top:40px;background:#fff;padding:30px 40px;border-radius:8px;box-shadow:0 2px 8px #0000001a;width:400px}h1{font-size:1.4rem;margin-bottom:20px;text-align:center}.upload-section{margin-bottom:20px;display:flex;flex-direction:column;gap:10px}button{padding:10px 15px;background-color:#007bff;border:none;color:#fff;border-radius:4px;cursor:pointer;font-size:.95rem;transition:background-color .2s ease}button:hover{background-color:#0056b3}button:disabled{background-color:#aaa;cursor:not-allowed}.button{display:inline-block;padding:10px 15px;background-color:#28a745;border:none;color:#fff;border-radius:4px;text-decoration:none;font-size:.95rem;text-align:center;transition:background-color .2s ease}.button:hover{background-color:#218838}.status{margin-top:15px;min-height:24px;font-size:.9rem}.pipeline-section{margin-bottom:20px}.mapping-table{width:100%;border-collapse:collapse;margin-bottom:10px}.mapping-table td{padding:4px 6px}.mapping-row.required select:invalid{border:1px solid #dc3545}