breaking change: shorter css var names

packages/vant/docs/markdown/changelog.en-US.md

@@ -142,7 +142,7 @@ Vant follows [Semantic Versioning 2.0.0](https://semver.org/lang/zh-CN/).
 
 - Circle: add start-position prop [#9305](https://github.com/youzan/vant/issues/9305)
 - Slider: add reverse prop [#9308](https://github.com/youzan/vant/issues/9308)
-- NumberKeyboard: add van-number-keyboard-key-background-color css var [#9303](https://github.com/youzan/vant/issues/9303)
+- NumberKeyboard: add van-number-keyboard-key-background css var [#9303](https://github.com/youzan/vant/issues/9303)
 - PasswordInput: add password-input-text-color css var [#9304](https://github.com/youzan/vant/issues/9304)
 
 **Bug Fixes**
@@ -401,7 +401,7 @@ Vant follows [Semantic Versioning 2.0.0](https://semver.org/lang/zh-CN/).
 
 **Feature**
 
-- ActionBar: add @action-bar-icon-background-color less var [#8474](https://github.com/youzan/vant/issues/8474)
+- ActionBar: add @action-bar-icon-background less var [#8474](https://github.com/youzan/vant/issues/8474)
 - Popover: bump @popperjs/core@2.9.2 [0d1323](https://github.com/youzan/vant/commit/0d132337d5d263957a7993d60e47a18efec7313e)
 - perf: reduce bundle size [ba3e6d](https://github.com/youzan/vant/commit/ba3e6d56a0bc7ae3acc25b1380f054da3b9b020f)
 

packages/vant/docs/markdown/changelog.zh-CN.md

@@ -142,7 +142,7 @@ Vant 遵循 [Semver](https://semver.org/lang/zh-CN/) 语义化版本规范。
 
 - Circle: 新增 start-position 属性 [#9305](https://github.com/youzan/vant/issues/9305)
 - Slider: 新增 reverse 属性 [#9308](https://github.com/youzan/vant/issues/9308)
-- NumberKeyboard: 新增 van-number-keyboard-key-background-color CSS 变量 [#9303](https://github.com/youzan/vant/issues/9303)
+- NumberKeyboard: 新增 van-number-keyboard-key-background CSS 变量 [#9303](https://github.com/youzan/vant/issues/9303)
 - PasswordInput: add password-input-text-color CSS 变量 [#9304](https://github.com/youzan/vant/issues/9304)
 
 **Bug Fixes**
@@ -402,7 +402,7 @@ Vant 遵循 [Semver](https://semver.org/lang/zh-CN/) 语义化版本规范。
 
 **Feature**
 
-- ActionBar: 新增 @action-bar-icon-background-color 样式变量 [#8474](https://github.com/youzan/vant/issues/8474)
+- ActionBar: 新增 @action-bar-icon-background 样式变量 [#8474](https://github.com/youzan/vant/issues/8474)
 - Popover: 升级依赖的 @popperjs/core 到 2.9.2 版本 [0d1323](https://github.com/youzan/vant/commit/0d132337d5d263957a7993d60e47a18efec7313e)
 - perf: 优化包体积 [ba3e6d](https://github.com/youzan/vant/commit/ba3e6d56a0bc7ae3acc25b1380f054da3b9b020f)
 
@@ -965,7 +965,7 @@ Vant 遵循 [Semver](https://semver.org/lang/zh-CN/) 语义化版本规范。
 
 - Button: 新增 icon-position 属性 [#7174](https://github.com/youzan/vant/issues/7174)
 - slider: 新增 range 属性，支持范围选择 [#7175](https://github.com/youzan/vant/issues/7175)
-- TabbarItem: 新增 @tabbar-item-active-background-color 变量 [#7162](https://github.com/youzan/vant/issues/7162)
+- TabbarItem: 新增 @tabbar-item-active-background 变量 [#7162](https://github.com/youzan/vant/issues/7162)
 
 **Bug Fixes**
 

packages/vant/docs/markdown/migrate-from-v3.zh-CN.md

@@ -10,6 +10,25 @@
 
 不再支持基于 Less 变量进行主题定制，请使用 [ConfigProvider 全局配置](#/zh-CN/config-provider) 组件进行主题配置。
 
+### CSS 变量名称简化
+
+为了便于使用 CSS 变量，我们对部分 CSS 变量的名称进行了简化，使用更短的单词代替：
+
+```
+text-link -> link
+box-shadow -> shadow
+font-family -> font
+border-radius -> radius
+background-color -> background
+font-weight-bold -> font-bold
+border-width-base -> border-width
+price-integer-font -> price-font
+animation-duration -> duration
+transition-duration -> duration
+animation-timing-function-enter -> ease-out
+animation-timing-function-leave -> ease-in
+```
+
 ### API 调整
 
 #### Picker