return {
  'lervag/vimtex',
  ft = { 'tex', 'latex', 'cls', 'sty', 'bib' },
  lazy = false,
  init = function()
    -- macOS PDF viewer - Skim is better than Zathura on macOS
    vim.g.vimtex_view_method = 'skim'
    vim.g.vimtex_view_skim_sync = 1
    vim.g.vimtex_view_skim_activate = 1
    vim.g.vimtex_view_skim_reading_bar = 0
    vim.g.vimtex_view_skim_preserve_state = 1
    -- Alternative: use system default PDF viewer
    -- vim.g.vimtex_view_method = 'general'
    -- vim.g.vimtex_view_general_viewer = 'open'

    -- Compiler
    vim.g.vimtex_compiler_method = 'latexmk'
    vim.g.vimtex_compiler_latexmk_engines = {
      _ = '-pdf -xelatex -synctex=1 -interaction=nonstopmode',
    }
    vim.g.vimtex_compiler_latexmk = {
      build_dir = 'output',
      aux_dir = 'output',
      callback = 1,
      continuous = 1,
      executable = 'latexmk',
      options = {
        -- '-pdf',
        '-verbose',
        '-file-line-error',
        -- '-synctex=1',
        '-interaction=nonstopmode',
        -- '-xelatex',
        '-shell-escape',
        '-outdir=output',
        '-auxdir=output',
      },
    }

    -- Disable problematic default mappings
    vim.g.vimtex_mappings_disable = {
      ['n'] = { 'K' },
      ['x'] = { 'K' },
    }

    -- Quickfix
    vim.g.vimtex_quickfix_method = vim.fn.executable('pplatex') == 1 and 'pplatex' or 'latexlog'
    vim.g.vimtex_quickfix_mode = 2
    vim.g.vimtex_quickfix_open_on_warning = 0
    vim.g.vimtex_quickfix_ignore_filters = {
      'Underfull \\hbox',
      'Overfull \\hbox',
      'LaTeX Warning: .+ float specifier changed to',
      'LaTeX hooks Warning',
      'Package hyperref Warning: Token not allowed in a PDF string',
      'Package fontspec Warning',
      'Package everypage Warning',
      'Package microtype Warning',
      'LaTeX Warning: Command \\. invalid in math mode',
      'Package babel Warning',
      'Package biblatex Warning',
    }

    -- Folding
    vim.g.vimtex_fold_enabled = 1
    vim.g.vimtex_fold_types = {
      envs = { whitelist = { 'figure', 'table', 'equation', 'align' } },
      sections = { parse_levels = 1 },
    }

    -- Syntax
    vim.g.vimtex_syntax_enabled = 1
    vim.g.vimtex_syntax_conceal = {
      accents = 0,
      ligatures = 0,
      cites = 1,
      fancy = 0,
      spacing = 0,
      greek = 1,
      math_bounds = 0,
      math_delimiters = 0,
      math_fracs = 0,
      math_super_sub = 1,
      math_symbols = 1,
      sections = 0,
    }
  end,

  config = function()
    -- Auto-create output dir
    vim.api.nvim_create_autocmd({ 'BufNewFile', 'BufRead' }, {
      pattern = { '*.tex', '*.latex' },
      callback = function()
        if vim.bo.filetype == 'tex' or vim.bo.filetype == 'latex' then
          local output_dir = vim.fn.expand('%:p:h') .. '/output'
          if vim.fn.isdirectory(output_dir) == 0 then
            vim.fn.mkdir(output_dir, 'p')
          end
        end
      end,
    })

    -- Toggle continuous compilation function
    _G.vimtex_toggle_continuous = function()
      if vim.g.vimtex_compiler_latexmk.continuous == 1 then
        vim.g.vimtex_compiler_latexmk.continuous = 0
        print('Continuous compilation OFF')
        vim.cmd('VimtexStop')
      else
        vim.g.vimtex_compiler_latexmk.continuous = 1
        print('Continuous compilation ON')
        vim.cmd('VimtexCompile')
      end
    end

    -- Function to close Skim for current PDF
    local function close_skim()
      local file_name = vim.fn.expand('%:t:r')
      if file_name ~= '' then
        local pdf_name = file_name .. '.pdf'
        -- AppleScript to close Skim window for specific PDF
        local script = string.format(
          [[
          tell application "System Events"
            if (name of processes) contains "Skim" then
              tell application "Skim"
                set theWindows to every window whose name contains "%s"
                repeat with theWindow in theWindows
                  close theWindow
                end repeat
              end tell
            end if
          end tell
        ]],
          pdf_name
        )
        vim.fn.system({ 'osascript', '-e', script })
      end
    end

    -- Auto-close Skim when LaTeX buffer is deleted or closed
    vim.api.nvim_create_autocmd({ 'BufDelete', 'BufWipeout' }, {
      pattern = { '*.tex', '*.latex' },
      callback = function()
        close_skim()
      end,
    })

    -- Also close when Neovim exits
    vim.api.nvim_create_autocmd('VimLeave', {
      pattern = { '*.tex', '*.latex' },
      callback = function()
        close_skim()
      end,
    })
  end,

  -- Use VimTeX's standard keymaps - only add minimal custom ones
  keys = {
    -- Standard VimTeX mappings (these are the defaults, just making them explicit)
    { '<localleader>ll', '<cmd>VimtexCompile<cr>', desc = 'VimTeX: Compile', ft = { 'tex', 'latex' } },
    { '<localleader>lv', '<cmd>VimtexView<cr>', desc = 'VimTeX: View PDF', ft = { 'tex', 'latex' } },
    { '<localleader>ls', '<cmd>VimtexStop<cr>', desc = 'VimTeX: Stop', ft = { 'tex', 'latex' } },
    { '<localleader>lS', '<cmd>VimtexStopAll<cr>', desc = 'VimTeX: Stop All', ft = { 'tex', 'latex' } },
    { '<localleader>lc', '<cmd>VimtexClean<cr>', desc = 'VimTeX: Clean', ft = { 'tex', 'latex' } },
    { '<localleader>lC', '<cmd>VimtexClean!<cr>', desc = 'VimTeX: Clean All', ft = { 'tex', 'latex' } },
    { '<localleader>lq', '<cmd>VimtexErrors<cr>', desc = 'VimTeX: Errors', ft = { 'tex', 'latex' } },
    { '<localleader>lk', '<cmd>VimtexLog<cr>', desc = 'VimTeX: Log', ft = { 'tex', 'latex' } },
    { '<localleader>li', '<cmd>VimtexInfo<cr>', desc = 'VimTeX: Info', ft = { 'tex', 'latex' } },
    { '<localleader>lI', '<cmd>VimtexInfoFull<cr>', desc = 'VimTeX: Info Full', ft = { 'tex', 'latex' } },
    { '<localleader>lt', '<cmd>VimtexTocToggle<cr>', desc = 'VimTeX: TOC Toggle', ft = { 'tex', 'latex' } },
    { '<localleader>lT', '<cmd>VimtexTocOpen<cr>', desc = 'VimTeX: TOC Open', ft = { 'tex', 'latex' } },
    { '<localleader>lw', '<cmd>VimtexCountWords<cr>', desc = 'VimTeX: Count Words', ft = { 'tex', 'latex' } },
    { '<localleader>lW', '<cmd>VimtexCountLetters<cr>', desc = 'VimTeX: Count Letters', ft = { 'tex', 'latex' } },
    { '<localleader>lm', '<cmd>VimtexImapsList<cr>', desc = 'VimTeX: Imaps List', ft = { 'tex', 'latex' } },

    -- Only one custom mapping for continuous compilation toggle
    {
      '<localleader>lR',
      function()
        _G.vimtex_toggle_continuous()
      end,
      desc = 'VimTeX: Toggle Continuous',
      ft = { 'tex', 'latex' },
    },
  },
}