diff --git a/after/lsp/bashls.lua b/after/lsp/bashls.lua
index 63dbf5f..9c5abca 100644
--- a/after/lsp/bashls.lua
+++ b/after/lsp/bashls.lua
@@ -1,4 +1,3 @@
-local lsp = require("lsp")
 local util = require("util")
 
 ---@type vim.lsp.Config
@@ -9,8 +8,6 @@ return {
         "zsh",
     },
     on_attach = function(client, bufnr)
-        lsp.on_attach(client, bufnr)
-
         vim.keymap.set("n", "<leader>lf", function()
             util.format({
                 buf = bufnr,
diff --git a/after/lsp/clangd.lua b/after/lsp/clangd.lua
index 9edfb9e..f703962 100644
--- a/after/lsp/clangd.lua
+++ b/after/lsp/clangd.lua
@@ -1,5 +1,4 @@
 local Linter = require("linter")
-local lsp = require("lsp")
 
 ---@type vim.lsp.Config
 return {
@@ -14,8 +13,6 @@ return {
     },
     single_file_support = true,
     on_attach = function(client, bufnr)
-        lsp.on_attach(client, bufnr)
-
         Linter.add(bufnr, {
             cmd = {
                 "clang-tidy",
diff --git a/after/lsp/gopls.lua b/after/lsp/gopls.lua
index 6f6d6d9..be7d2d3 100644
--- a/after/lsp/gopls.lua
+++ b/after/lsp/gopls.lua
@@ -1,4 +1,3 @@
-local lsp = require("lsp")
 local util = require("util")
 
 ---@type vim.lsp.Config
@@ -13,8 +12,6 @@ return {
         },
     },
     on_attach = function(client, bufnr)
-        lsp.on_attach(client, bufnr)
-
         vim.keymap.set("n", "<leader>lf", function()
             util.format({
                 buf = bufnr,
diff --git a/after/lsp/intelephense.lua b/after/lsp/intelephense.lua
index b66e7b9..dd48328 100644
--- a/after/lsp/intelephense.lua
+++ b/after/lsp/intelephense.lua
@@ -1,5 +1,4 @@
 local Linter = require("linter")
-local lsp = require("lsp")
 local util = require("util")
 
 ---@type vim.lsp.Config
@@ -13,8 +12,6 @@ return {
         },
     },
     on_attach = function(client, bufnr)
-        lsp.on_attach(client, bufnr)
-
         Linter.add(bufnr, {
             cmd = {
                 "phpcs",
diff --git a/after/lsp/lua_ls.lua b/after/lsp/lua_ls.lua
index c667cbd..56302f0 100644
--- a/after/lsp/lua_ls.lua
+++ b/after/lsp/lua_ls.lua
@@ -31,7 +31,6 @@ return {
         },
     },
     on_attach = function(client, bufnr)
-        require("lsp").on_attach(client, bufnr)
         local util = require("util")
 
         vim.keymap.set("n", "<leader>lf", function()
diff --git a/after/lsp/ruff.lua b/after/lsp/ruff.lua
index 5a5fd3b..d996894 100644
--- a/after/lsp/ruff.lua
+++ b/after/lsp/ruff.lua
@@ -1,11 +1,8 @@
-local lsp = require("lsp")
 local util = require("util")
 
 ---@type vim.lsp.Config
 return {
     on_attach = function(client, bufnr)
-        lsp.on_attach(client, bufnr)
-
         vim.keymap.set("n", "<leader>lf", function()
             vim.lsp.buf.format()
             util.format({
diff --git a/init.lua b/init.lua
index f3f946d..45993dc 100644
--- a/init.lua
+++ b/init.lua
@@ -25,10 +25,6 @@ local ts = require("ts")
 require("pack").setup({
     "https://github.com/navarasu/onedark.nvim",
     "https://github.com/ibhagwan/fzf-lua",
-    {
-        "https://github.com/saghen/blink.cmp",
-        version = vim.version.range("^1"),
-    },
     "https://github.com/neovim/nvim-lspconfig",
     "https://github.com/mason-org/mason.nvim",
     "https://github.com/owallb/mason-auto-install.nvim",
diff --git a/lua/core/options.lua b/lua/core/options.lua
index 1035d3c..2f9c527 100644
--- a/lua/core/options.lua
+++ b/lua/core/options.lua
@@ -26,14 +26,14 @@ vim.opt.foldlevel = 99
 vim.opt.foldlevelstart = 99
 vim.opt.foldmethod = "indent"
 vim.opt.foldignore = ""
----@diagnostic disable-next-line: undefined-field
-vim.opt.completeopt:append({
+vim.opt.completeopt = {
     "menu",
     "menuone",
-    "preview",
+    "popup",
     "noinsert",
     "noselect",
-})
+}
+vim.opt.complete = { "o" }
 -- set nowrap
 vim.opt.matchpairs:append({ "<:>" })
 -- Only relevant with wrap enabled (default)
diff --git a/lua/lsp.lua b/lua/lsp.lua
index 9af951b..f98ba09 100644
--- a/lua/lsp.lua
+++ b/lua/lsp.lua
@@ -1,8 +1,12 @@
----@type fun(name: string, cfg: vim.lsp.Config)
-vim.lsp.config = vim.lsp.config
-
 local log = require("log")
 
+local WORD_CHARS =
+    "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_"
+
+local function fence(ft, text)
+    return string.format("```%s\n%s\n```", ft, text)
+end
+
 local M = {}
 
 M.diagnostic_signs = {
@@ -45,6 +49,58 @@ function M.on_attach(client, buf)
         client.settings
     ) or client.settings
 
+    if
+        client:supports_method(vim.lsp.protocol.Methods.textDocument_completion)
+    then
+        local provider = client.server_capabilities.completionProvider
+        provider.triggerCharacters = provider.triggerCharacters or {}
+        if not provider._word_chars_added then
+            provider._word_chars_added = true
+            for c in WORD_CHARS:gmatch(".") do
+                table.insert(provider.triggerCharacters, c)
+            end
+        end
+        local group = vim.api.nvim_create_augroup(
+            "lsp_completion_" .. buf,
+            { clear = true }
+        )
+        vim.api.nvim_create_autocmd("TextChangedI", {
+            buffer = buf,
+            group = group,
+            callback = function()
+                if vim.fn.pumvisible() ~= 0 then
+                    return
+                end
+                local col = vim.fn.col(".") - 1
+                if col <= 0 then
+                    return
+                end
+                local char = vim.api.nvim_get_current_line():sub(col, col)
+                if char:match("[%w_]") then
+                    vim.lsp.completion.get()
+                end
+            end,
+        })
+        vim.lsp.completion.enable(true, client.id, buf, {
+            autotrigger = true,
+            convert = function(item)
+                local signature = vim.tbl_get(
+                    item,
+                    "labelDetails",
+                    "description"
+                ) or item.detail or ""
+                return {
+                    abbr = item.label:match("[^(]+") or item.label,
+                    menu = "",
+                    kind = "",
+                    info = signature ~= ""
+                            and fence(vim.bo[buf].filetype, signature)
+                        or " ",
+                }
+            end,
+        })
+    end
+
     vim.api.nvim_create_autocmd("LspProgress", {
         buffer = buf,
         callback = function(ev)
@@ -72,7 +128,7 @@ function M.setup()
             border = "rounded",
             focusable = true,
             format = function(diagnostic)
-                return string.format("%s", diagnostic.message)
+                return diagnostic.message
             end,
             width = 80,
         },
@@ -109,23 +165,170 @@ function M.setup()
     })
 
     local capabilities = vim.lsp.protocol.make_client_capabilities()
-    capabilities = vim.tbl_deep_extend(
-        "force",
-        capabilities,
-        require("blink.cmp").get_lsp_capabilities({
-            textDocument = {
-                completion = {
-                    completionItem = {
-                        snippetSupport = false,
-                    },
-                },
-            },
-        }, false)
-    )
+    capabilities.textDocument.completion.completionItem.snippetSupport = false
     vim.lsp.config("*", {
         capabilities = capabilities,
-        on_attach = M.on_attach,
     })
+
+    vim.api.nvim_create_autocmd("LspAttach", {
+        callback = function(ev)
+            local client = vim.lsp.get_client_by_id(ev.data.client_id)
+            if client then
+                M.on_attach(client, ev.buf)
+            end
+        end,
+    })
+
+    local function style_popup(winid, bufnr, width)
+        if
+            not winid
+            or winid <= 0
+            or not vim.api.nvim_win_is_valid(winid)
+            or vim.api.nvim_win_get_config(winid).relative == ""
+        then
+            return
+        end
+        local cfg = { border = "rounded" }
+        if width then
+            cfg.width = math.min(width, 80)
+        end
+        if bufnr and vim.api.nvim_buf_is_valid(bufnr) then
+            vim.wo[winid].wrap = true
+            vim.wo[winid].linebreak = true
+            vim.wo[winid].conceallevel = 2
+            pcall(vim.treesitter.start, bufnr, "markdown")
+        end
+        pcall(vim.api.nvim_win_set_config, winid, cfg)
+    end
+
+    vim.api.nvim_create_autocmd("CompleteChanged", {
+        callback = function(ev)
+            local cinfo = vim.fn.complete_info({
+                "selected",
+                "preview_winid",
+                "preview_bufnr",
+            })
+            style_popup(cinfo.preview_winid, cinfo.preview_bufnr)
+
+            local completed = vim.v.event.completed_item or {}
+            local lsp_item = vim.tbl_get(
+                completed,
+                "user_data",
+                "nvim",
+                "lsp",
+                "completion_item"
+            )
+            local client_id =
+                vim.tbl_get(completed, "user_data", "nvim", "lsp", "client_id")
+            if not lsp_item or not client_id then
+                return
+            end
+
+            local client = vim.lsp.get_client_by_id(client_id)
+            if
+                not client
+                or not client:supports_method(
+                    vim.lsp.protocol.Methods.completionItem_resolve
+                )
+            then
+                return
+            end
+
+            local selected = cinfo.selected
+            local word = completed.word
+            client:request(
+                vim.lsp.protocol.Methods.completionItem_resolve,
+                lsp_item,
+                function(err, result)
+                    if err or not result then
+                        return
+                    end
+
+                    local cur = vim.fn.complete_info({
+                        "selected",
+                        "completed",
+                        "preview_winid",
+                    })
+                    if
+                        cur.selected ~= selected
+                        or (vim.tbl_get(cur, "completed", "word") or "")
+                            ~= word
+                    then
+                        return
+                    end
+
+                    local signature = vim.tbl_get(
+                        result,
+                        "labelDetails",
+                        "description"
+                    ) or result.detail or ""
+                    local doc = result.documentation
+                    if type(doc) == "table" then
+                        doc = doc.value
+                    end
+                    doc = doc or ""
+
+                    local ft = vim.bo[ev.buf].filetype
+                    local code_parts = {}
+                    if result.additionalTextEdits then
+                        for _, edit in ipairs(result.additionalTextEdits) do
+                            local text = (edit.newText or ""):gsub("%s+$", "")
+                            if text ~= "" then
+                                table.insert(code_parts, fence(ft, text))
+                            end
+                        end
+                    end
+                    if signature ~= "" then
+                        table.insert(code_parts, fence(ft, signature))
+                    end
+                    local sections = {}
+                    if #code_parts > 0 then
+                        table.insert(sections, table.concat(code_parts, "\n\n"))
+                    end
+                    if doc ~= "" then
+                        table.insert(sections, doc)
+                    end
+                    if #sections == 0 then
+                        if
+                            cur.preview_winid
+                            and cur.preview_winid > 0
+                            and vim.api.nvim_win_is_valid(cur.preview_winid)
+                        then
+                            pcall(
+                                vim.api.nvim_win_close,
+                                cur.preview_winid,
+                                true
+                            )
+                        end
+                        return
+                    end
+
+                    local max_w = 0
+                    for _, s in ipairs(sections) do
+                        for _, line in
+                            ipairs(vim.split(s, "\n", { plain = true }))
+                        do
+                            max_w =
+                                math.max(max_w, vim.fn.strdisplaywidth(line))
+                        end
+                    end
+                    local sep = "\n"
+                        .. string.rep("─", math.min(max_w, 80))
+                        .. "\n"
+                    local combined = table.concat(sections, sep)
+
+                    local windata = vim.api.nvim__complete_set(selected, {
+                        info = combined,
+                    })
+                    if windata then
+                        style_popup(windata.winid, windata.bufnr, max_w)
+                    end
+                end,
+                ev.buf
+            )
+        end,
+    })
+
     vim.lsp.log.set_level(vim.log.levels.WARN)
 end
 
diff --git a/lua/plugins/blink.lua b/lua/plugins/blink.lua
deleted file mode 100644
index fe6efb6..0000000
--- a/lua/plugins/blink.lua
+++ /dev/null
@@ -1,88 +0,0 @@
-require("blink.cmp").setup({
-    completion = {
-        documentation = {
-            auto_show = true,
-            window = {
-                winhighlight = "",
-            },
-        },
-        ghost_text = {
-            enabled = true,
-        },
-        list = {
-            selection = {
-                preselect = false,
-                auto_insert = false,
-            },
-        },
-        menu = {
-            border = "none",
-            draw = {
-                align_to = "simple_label",
-                columns = {
-                    { "simple_label" },
-                    { "kind_icon", "label_description", gap = 1 },
-                },
-                components = {
-                    simple_label = {
-                        width = { fill = true, max = 60 },
-                        text = function(ctx)
-                            return ctx.label
-                        end,
-                        highlight = function(ctx)
-                            local highlights = {
-                                {
-                                    0,
-                                    #ctx.label,
-                                    group = ctx.deprecated
-                                            and "BlinkCmpLabelDeprecated"
-                                        or "BlinkCmpLabel",
-                                },
-                            }
-                            for _, idx in ipairs(ctx.label_matched_indices) do
-                                table.insert(highlights, {
-                                    idx,
-                                    idx + 1,
-                                    group = "BlinkCmpLabelMatch",
-                                })
-                            end
-
-                            return highlights
-                        end,
-                    },
-                },
-            },
-        },
-    },
-    fuzzy = {
-        implementation = "prefer_rust_with_warning",
-    },
-    signature = {
-        enabled = true,
-        window = {
-            winhighlight = "",
-            show_documentation = false,
-        },
-    },
-    sources = {
-        default = {
-            "lsp",
-            "path",
-        },
-        transform_items = function(_, items)
-            return vim.tbl_filter(function(item)
-                return item.kind
-                    ~= require("blink.cmp.types").CompletionItemKind.Snippet
-            end, items)
-        end,
-    },
-    keymap = {
-        preset = "none",
-        ["<Tab>"] = { "insert_next", "fallback" },
-        ["<S-Tab>"] = { "insert_prev", "fallback" },
-        ["<CR>"] = { "accept", "fallback" },
-        ["<C-k>"] = { "show_signature", "hide_signature", "fallback" },
-        ["<C-n>"] = { "snippet_forward", "fallback" },
-        ["<C-p>"] = { "snippet_backward", "fallback" },
-    },
-})