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diff --git a/core/core-editing.el b/core/core-editing.el
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+;; -*- lexical-binding: t; -*-
+(show-paren-mode t)
+(save-place-mode 1)
+(global-subword-mode 1)
+(add-hook 'prog-mode-hook #'show-paren-mode)
+
+(electric-pair-mode 1)
+
+(defun setup-markdown-writing-environment ()
+  "为 Markdown 写作优化的环境：开启 Olivetti，关闭行号。"
+  (interactive)
+  (variable-pitch-mode 1)
+  (display-line-numbers-mode -1)
+  (pixel-scroll-precision-mode 1)
+  (olivetti-mode))
+
+(add-hook 'markdown-mode-hook
+          (lambda ()
+            ;; 取消 Evil 的 TAB 绑定，使用 markdown-cycle
+            (define-key evil-normal-state-local-map (kbd "TAB") 'markdown-cycle)
+            (define-key evil-insert-state-local-map (kbd "TAB") 'indent-for-tab-command)))
+
+(setq evil-want-C-u-scroll t)
+
+(provide 'core-editing)