*{box-sizing:border-box}body{font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Helvetica Neue,Arial;margin:0;padding:16px;background:#f5f6fa}.app{max-width:1200px;margin:0 auto}.controls{display:flex;gap:12px;align-items:center;margin-bottom:12px}.columns-list{max-height:200px;overflow:auto;border:1px solid #ddd;padding:8px;background:#fff}.charts{display:flex;flex-direction:column;gap:12px}.chart-card{background:#fff;padding:8px;border-radius:8px;box-shadow:0 1px 4px #0000000f}.range{width:100%}.file-input{padding:8px}.sample-csv{font-family:monospace;white-space:pre;background:#fff;padding:8px;border-radius:6px;border:1px solid #eee}