section"""
    lines = [
        "| 元素选择器 | 页面Top(px) | 高度(px) | 高度(rpx) | paddingT | paddingB | marginT | marginB | gap | fontSize | lineHeight |",
        "|---|---|---|---|---|---|---|---|---|---|---|",
    ]
    for it in items:
        h_rpx = px_to_rpx(it['height'])
        lh = px_val(it['lineHeight']) if it['lineHeight'] not in ('normal', '') else 0
        lines.append(
            f"| {it['selector']}[{it['index']}] "
            f"| {it['pageTop']:.1f} | {it['height']:.1f} | {h_rpx} "
            f"| {it['paddingTop']} | {it['paddingBottom']} "
            f"| {it['marginTop']} | {it['marginBottom']} "
            f"| {it.get('gap','0px')} | {it['fontSize']} | {it['lineHeight']} |"
        )
    return "\n".join(lines)


def main():
    if sys.platform == 'win32':
        sys.stdout = io.TextIOWrapper(sys.stdout.buffer, encoding='utf-8', errors='replace')
    parser = argparse.ArgumentParser(description='测量 H5 页面元素间距，输出 px 和 rpx')
    parser.add_argument('page', help='页面名，如 task-list')
    parser.add_argument('--selectors', nargs='+', default=[], help='CSS 选择器列表')
    parser.add_argument('--scroll', type=int, default=0, help='scrollTop 位置（默认 0）')
    parser.add_argument('--pairs', nargs=2, metavar=('A', 'B'), help='计算两个选择器间的间距')
    parser.add_argument('--out', help='输出 JSON 路径（默认自动命名）')
    args = parser.parse_args()

    if not args.selectors and not args.pairs:
        print('请指定 --selectors 或 --pairs')
        parser.print_help()
        sys.exit(1)

    selectors = args.selectors or list(args.pairs)
    results = asyncio.run(measure_page(args.page, selectors, args.scroll, args.pairs))

    # save JSON
    out_path = Path(args.out) if args.out else OUT_DIR / f"{args.page}-gaps.json"
    with open(out_path, 'w', encoding='utf-8') as f:
        json.dump(results, f, ensure_ascii=False, indent=2)

    # print table
    items = results.get('items', [])
    if items:
        print(f'\n页面: {args.page}  scrollTop={args.scroll}  元素数: {len(items)}')
        print_table(items)

        # spacing props summary
        print('\n关键间距汇总（px → rpx）:')
        for it in items:
            pt = px_val(it['paddingTop'])
            pb = px_val(it['paddingBottom'])
            mt = px_val(it['marginTop'])
            mb = px_val(it['marginBottom'])
            g  = px_val(it.get('gap', '0px'))
            fs = px_val(it['fontSize'])
            lh_raw = it['lineHeight']
            lh = px_val(lh_raw) if lh_raw not in ('normal', '') else 0
            parts = []
            if pt: parts.append(f'paddingTop={pt:.1f}px→{px_to_rpx(pt)}rpx')
            if pb: parts.append(f'paddingBot={pb:.1f}px→{px_to_rpx(pb)}rpx')
            if mt: parts.append(f'marginTop={mt:.1f}px→{px_to_rpx(mt)}rpx')
            if mb: parts.append(f'marginBot={mb:.1f}px→{px_to_rpx(mb)}rpx')
            if g:  parts.append(f'gap={g:.1f}px→{px_to_rpx(g)}rpx')
            if fs: parts.append(f'fontSize={fs:.1f}px→{px_to_rpx(fs)}rpx')
            if lh: parts.append(f'lineHeight={lh:.1f}px→{px_to_rpx(lh)}rpx')
            if parts:
                print(f'  {it["selector"]}[{it["index"]}]: {"  ".join(parts)}')

    # consecutive gaps
    gaps = results.get('consecutive_gaps', [])
    if gaps:
        print('\n\u76f8邻元素垂直间距:')
        print_gaps(gaps)

    # pair gap
    pg = results.get('pair_gap')
    if pg:
        print(f'\n指定对间距: {pg["a"]} → {pg["b"]}: {pg["gap_px"]:.1f}px = {pg["gap_rpx"]}rpx')

    # markdown table
    print('\n--- audit.md 间距表格 ---')
    print(spacing_audit_table(items))
    print(f'\n详细数据已保存: {out_path}')


if __name__ == '__main__':
    main()