gruvebox in ssh seems not correspond to local terminal‘s one

" 启用真彩色支持
if has('termguicolors')
  set termguicolors
endif

" 确保 256 色支持
set t_Co=256

" gruvbox 配置
let g:gruvbox_termcolors = 256
let g:gruvbox_contrast_dark = 'medium'
set background=dark
colorscheme gruvbox