diff --git a/packages/vant/src/action-bar-button/index.less b/packages/vant/src/action-bar-button/index.less
index 8a519df7d..9df4bd0f6 100644
--- a/packages/vant/src/action-bar-button/index.less
+++ b/packages/vant/src/action-bar-button/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-action-bar-button-height: 40px;
   --van-action-bar-button-warning-color: var(--van-gradient-orange);
   --van-action-bar-button-danger-color: var(--van-gradient-red);
diff --git a/packages/vant/src/action-bar-icon/index.less b/packages/vant/src/action-bar-icon/index.less
index b118e36a2..809efdc39 100644
--- a/packages/vant/src/action-bar-icon/index.less
+++ b/packages/vant/src/action-bar-icon/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-action-bar-icon-width: 48px;
   --van-action-bar-icon-height: 100%;
   --van-action-bar-icon-color: var(--van-text-color);
diff --git a/packages/vant/src/action-bar/index.less b/packages/vant/src/action-bar/index.less
index 8457bd0c6..86c3feced 100644
--- a/packages/vant/src/action-bar/index.less
+++ b/packages/vant/src/action-bar/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-action-bar-background: var(--van-background-light);
   --van-action-bar-height: 50px;
 }
diff --git a/packages/vant/src/action-sheet/index.less b/packages/vant/src/action-sheet/index.less
index 265ab51ab..b54e07780 100644
--- a/packages/vant/src/action-sheet/index.less
+++ b/packages/vant/src/action-sheet/index.less
@@ -1,6 +1,6 @@
 @import '../style/mixins/hairline';
 
-:root {
+body {
   --van-action-sheet-max-height: 80%;
   --van-action-sheet-header-height: 48px;
   --van-action-sheet-header-font-size: var(--van-font-size-lg);
diff --git a/packages/vant/src/address-edit/index.less b/packages/vant/src/address-edit/index.less
index f5be05099..653bb2e5f 100644
--- a/packages/vant/src/address-edit/index.less
+++ b/packages/vant/src/address-edit/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-address-edit-padding: var(--van-padding-sm);
   --van-address-edit-buttons-padding: var(--van-padding-xl)
     var(--van-padding-base);
diff --git a/packages/vant/src/address-list/index.less b/packages/vant/src/address-list/index.less
index 2f33e8ae6..1c50e0c1d 100644
--- a/packages/vant/src/address-list/index.less
+++ b/packages/vant/src/address-list/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-address-list-padding: var(--van-padding-sm) var(--van-padding-sm) 80px;
   --van-address-list-disabled-text-color: var(--van-text-color-2);
   --van-address-list-disabled-text-padding: calc(var(--van-padding-base) * 5) 0;
diff --git a/packages/vant/src/badge/index.less b/packages/vant/src/badge/index.less
index a5580eeb8..6b2d1eaca 100644
--- a/packages/vant/src/badge/index.less
+++ b/packages/vant/src/badge/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-badge-size: 16px;
   --van-badge-color: var(--van-white);
   --van-badge-padding: 0 3px;
diff --git a/packages/vant/src/button/index.less b/packages/vant/src/button/index.less
index 52f3e4d45..02a7cf6c4 100644
--- a/packages/vant/src/button/index.less
+++ b/packages/vant/src/button/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-button-mini-height: 24px;
   --van-button-mini-padding: 0 var(--van-padding-base);
   --van-button-mini-font-size: var(--van-font-size-xs);
@@ -35,6 +35,10 @@
   --van-button-loading-icon-size: 20px;
 }
 
+.van-theme-dark {
+  --van-button-plain-background: transparent;
+}
+
 .van-button {
   position: relative;
   display: inline-block;
diff --git a/packages/vant/src/calendar/index.less b/packages/vant/src/calendar/index.less
index de5149f4e..f208dfc77 100644
--- a/packages/vant/src/calendar/index.less
+++ b/packages/vant/src/calendar/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-calendar-background: var(--van-background-light);
   --van-calendar-popup-height: 80%;
   --van-calendar-header-shadow: 0 2px 10px rgba(125, 126, 128, 0.16);
@@ -26,6 +26,11 @@
   --van-calendar-confirm-button-margin: 7px 0;
 }
 
+.van-theme-dark {
+  --van-calendar-month-mark-color: rgba(100, 101, 102, 0.2);
+  --van-calendar-day-disabled-color: var(--van-gray-7);
+}
+
 .van-calendar {
   display: flex;
   flex-direction: column;
diff --git a/packages/vant/src/card/index.less b/packages/vant/src/card/index.less
index fb412ca9d..2580c1315 100644
--- a/packages/vant/src/card/index.less
+++ b/packages/vant/src/card/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-card-padding: var(--van-padding-xs) var(--van-padding-md);
   --van-card-font-size: var(--van-font-size-sm);
   --van-card-text-color: var(--van-text-color);
diff --git a/packages/vant/src/cascader/index.less b/packages/vant/src/cascader/index.less
index c1a53d94f..0ed61a5b7 100644
--- a/packages/vant/src/cascader/index.less
+++ b/packages/vant/src/cascader/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-cascader-header-height: 48px;
   --van-cascader-header-padding: 0 var(--van-padding-md);
   --van-cascader-title-font-size: var(--van-font-size-lg);
diff --git a/packages/vant/src/cell-group/index.less b/packages/vant/src/cell-group/index.less
index 7399c5931..c1c88178c 100644
--- a/packages/vant/src/cell-group/index.less
+++ b/packages/vant/src/cell-group/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-cell-group-background: var(--van-background-light);
   --van-cell-group-title-color: var(--van-text-color-2);
   --van-cell-group-title-padding: var(--van-padding-md) var(--van-padding-md);
diff --git a/packages/vant/src/cell/index.less b/packages/vant/src/cell/index.less
index 7df7b23a8..07f2b0110 100644
--- a/packages/vant/src/cell/index.less
+++ b/packages/vant/src/cell/index.less
@@ -1,6 +1,6 @@
 @import '../style/mixins/hairline';
 
-:root {
+body {
   --van-cell-font-size: var(--van-font-size-md);
   --van-cell-line-height: 24px;
   --van-cell-vertical-padding: 10px;
diff --git a/packages/vant/src/checkbox/index.less b/packages/vant/src/checkbox/index.less
index f64a42e98..be80dc6ea 100644
--- a/packages/vant/src/checkbox/index.less
+++ b/packages/vant/src/checkbox/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-checkbox-size: 20px;
   --van-checkbox-border-color: var(--van-gray-5);
   --van-checkbox-duration: var(--van-duration-fast);
diff --git a/packages/vant/src/circle/index.less b/packages/vant/src/circle/index.less
index 503d5f484..356c32939 100644
--- a/packages/vant/src/circle/index.less
+++ b/packages/vant/src/circle/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-circle-size: 100px;
   --van-circle-color: var(--van-primary-color);
   --van-circle-layer-color: var(--van-white);
diff --git a/packages/vant/src/collapse-item/index.less b/packages/vant/src/collapse-item/index.less
index 68e5c26a8..c1beaaf5b 100644
--- a/packages/vant/src/collapse-item/index.less
+++ b/packages/vant/src/collapse-item/index.less
@@ -1,6 +1,6 @@
 @import '../style/mixins/hairline';
 
-:root {
+body {
   --van-collapse-item-duration: var(--van-duration-base);
   --van-collapse-item-content-padding: var(--van-padding-sm)
     var(--van-padding-md);
diff --git a/packages/vant/src/config-provider/README.md b/packages/vant/src/config-provider/README.md
index 51589536c..ba88354cd 100644
--- a/packages/vant/src/config-provider/README.md
+++ b/packages/vant/src/config-provider/README.md
@@ -33,10 +33,10 @@ Looking at the style of the Button component, you can see that the following var
 }
 ```
 
-The default values of these variables are defined on the `root` node:
+The default values of these variables are defined on the `body` node:
 
 ```css
-:root {
+body {
   --van-white: #fff;
   --van-blue: #1989fa;
   --van-button-primary-color: var(--van-white);
@@ -52,7 +52,7 @@ You can directly override these CSS variables in the code, and the style of the
 
 ```css
 /* the Primary Button will turn red */
-:root {
+body {
   --van-button-primary-background: red;
 }
 ```
@@ -120,8 +120,8 @@ CSS variables in Vant are divided into **basic variables** and **component varia
 
 #### Modify Basic Variables
 
-- The basic variables can only be modified through the `root` selector.
-- The component variables can be modified through the `root` selector and `ConfigProvider` component.
+- The basic variables can only be modified through the `body` selector.
+- The component variables can be modified through the `body` selector and `ConfigProvider` component.
 
 #### Variable List
 
diff --git a/packages/vant/src/config-provider/README.zh-CN.md b/packages/vant/src/config-provider/README.zh-CN.md
index 8d88bbe2a..5b2d35622 100644
--- a/packages/vant/src/config-provider/README.zh-CN.md
+++ b/packages/vant/src/config-provider/README.zh-CN.md
@@ -33,10 +33,10 @@ Vant 组件通过丰富的 [CSS 变量](https://developer.mozilla.org/zh-CN/docs
 }
 ```
 
-这些变量的默认值被定义在 `root` 节点上，HTML 文档的任何节点都可以访问到这些变量：
+这些变量的默认值被定义在 `body` 节点上，body 下所有子节点都可以访问到这些变量：
 
 ```css
-:root {
+body {
   --van-white: #fff;
   --van-blue: #1989fa;
   --van-button-primary-color: var(--van-white);
@@ -52,7 +52,7 @@ Vant 组件通过丰富的 [CSS 变量](https://developer.mozilla.org/zh-CN/docs
 
 ```css
 /* 添加这段样式后，Primary Button 会变成红色 */
-:root {
+body {
   --van-button-primary-background: red;
 }
 ```
@@ -112,7 +112,7 @@ export default {
 };
 ```
 
-> 注意：ConfigProvider 仅影响它的子组件的样式，不影响全局 root 节点。
+> 注意：ConfigProvider 仅影响它的子组件的样式，不影响全局 body 节点。
 
 ### 基础变量
 
@@ -122,8 +122,8 @@ Vant 中的 CSS 变量分为 **基础变量** 和 **组件变量**。组件变
 
 由于 CSS 变量继承机制的原因，两者的修改方式有一定差异：
 
-- 基础变量只能通过 `root 选择器` 修改，不能通过 `ConfigProvider 组件` 修改。
-- 组件变量可以通过 `root 选择器` 和 `ConfigProvider 组件` 修改。
+- 基础变量只能通过 `body 选择器` 修改，不能通过 `ConfigProvider 组件` 修改。
+- 组件变量可以通过 `body 选择器` 和 `ConfigProvider 组件` 修改。
 
 #### 变量列表
 
diff --git a/packages/vant/src/config-provider/test/__snapshots__/demo.spec.ts.snap b/packages/vant/src/config-provider/test/__snapshots__/demo.spec.ts.snap
index e4325a3ec..be806aafa 100644
--- a/packages/vant/src/config-provider/test/__snapshots__/demo.spec.ts.snap
+++ b/packages/vant/src/config-provider/test/__snapshots__/demo.spec.ts.snap
@@ -122,7 +122,7 @@ exports[`should render demo and match snapshot 1`] = `
 </div>
 <div>
   <div class="van-config-provider"
-       style="--van-rate-icon-full-color: #07c160; --van-slider-bar-height: 4px; --van-slider-button-width: 20px; --van-slider-button-height: 20px; --van-slider-active-background-color: #07c160; --van-button-primary-border-color: #07c160; --van-button-primary-background-color: #07c160;"
+       style="--van-rate-icon-full-color: #07c160; --van-slider-bar-height: 4px; --van-slider-button-width: 20px; --van-slider-button-height: 20px; --van-slider-active-background: #07c160; --van-button-primary-border-color: #07c160; --van-button-primary-background: #07c160;"
   >
     <form class="van-form">
       <div class="van-cell van-field">
diff --git a/packages/vant/src/contact-card/index.less b/packages/vant/src/contact-card/index.less
index acc7e7a2f..1433b092e 100644
--- a/packages/vant/src/contact-card/index.less
+++ b/packages/vant/src/contact-card/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-contact-card-padding: var(--van-padding-md);
   --van-contact-card-add-icon-size: 40px;
   --van-contact-card-add-icon-color: var(--van-primary-color);
diff --git a/packages/vant/src/contact-edit/index.less b/packages/vant/src/contact-edit/index.less
index fc384f9fe..9e4d146ca 100644
--- a/packages/vant/src/contact-edit/index.less
+++ b/packages/vant/src/contact-edit/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-contact-edit-padding: var(--van-padding-md);
   --van-contact-edit-fields-radius: var(--van-radius-md);
   --van-contact-edit-buttons-padding: var(--van-padding-xl) 0;
diff --git a/packages/vant/src/contact-list/demo/index.vue b/packages/vant/src/contact-list/demo/index.vue
index e485504a7..d2bba4d0c 100644
--- a/packages/vant/src/contact-list/demo/index.vue
+++ b/packages/vant/src/contact-list/demo/index.vue
@@ -75,7 +75,7 @@ const onSelect = (contact: { id: string }) => {
 .demo-contact-card {
   .van-popup {
     height: 100%;
-    background-color: var(--van-background-color);
+    background-color: var(--van-background);
   }
 }
 </style>
diff --git a/packages/vant/src/contact-list/index.less b/packages/vant/src/contact-list/index.less
index c6d567dc4..1b8d7b6e7 100644
--- a/packages/vant/src/contact-list/index.less
+++ b/packages/vant/src/contact-list/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-contact-list-edit-icon-size: 16px;
   --van-contact-list-add-button-z-index: 999;
   --van-contact-list-item-padding: var(--van-padding-md);
diff --git a/packages/vant/src/count-down/index.less b/packages/vant/src/count-down/index.less
index 064c7b0a2..25fee0bc3 100644
--- a/packages/vant/src/count-down/index.less
+++ b/packages/vant/src/count-down/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-count-down-text-color: var(--van-text-color);
   --van-count-down-font-size: var(--van-font-size-md);
   --van-count-down-line-height: var(--van-line-height-md);
diff --git a/packages/vant/src/coupon-cell/index.less b/packages/vant/src/coupon-cell/index.less
index 49c2a3d2b..fd2f0b0bb 100644
--- a/packages/vant/src/coupon-cell/index.less
+++ b/packages/vant/src/coupon-cell/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-coupon-cell-selected-text-color: var(--van-text-color);
 }
 
diff --git a/packages/vant/src/coupon-list/index.less b/packages/vant/src/coupon-list/index.less
index 9570291de..f344d842e 100644
--- a/packages/vant/src/coupon-list/index.less
+++ b/packages/vant/src/coupon-list/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-coupon-list-background: var(--van-background);
   --van-coupon-list-field-padding: 5px 0 5px var(--van-padding-md);
   --van-coupon-list-exchange-button-height: 32px;
diff --git a/packages/vant/src/coupon/index.less b/packages/vant/src/coupon/index.less
index c101b9c36..18b9cf8bb 100644
--- a/packages/vant/src/coupon/index.less
+++ b/packages/vant/src/coupon/index.less
@@ -1,6 +1,6 @@
 @import '../style/mixins/ellipsis';
 
-:root {
+body {
   --van-coupon-margin: 0 var(--van-padding-sm) var(--van-padding-sm);
   --van-coupon-content-height: 84px;
   --van-coupon-content-padding: 14px 0;
diff --git a/packages/vant/src/dialog/index.less b/packages/vant/src/dialog/index.less
index 497b256c2..fee1468b9 100644
--- a/packages/vant/src/dialog/index.less
+++ b/packages/vant/src/dialog/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-dialog-width: 320px;
   --van-dialog-small-screen-width: 90%;
   --van-dialog-font-size: var(--van-font-size-lg);
diff --git a/packages/vant/src/divider/index.less b/packages/vant/src/divider/index.less
index 90ef8872c..474434bbc 100644
--- a/packages/vant/src/divider/index.less
+++ b/packages/vant/src/divider/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-divider-margin: var(--van-padding-md) 0;
   --van-divider-text-color: var(--van-text-color-2);
   --van-divider-font-size: var(--van-font-size-md);
diff --git a/packages/vant/src/dropdown-item/index.less b/packages/vant/src/dropdown-item/index.less
index 0c7a78dbc..8ecb7caf4 100644
--- a/packages/vant/src/dropdown-item/index.less
+++ b/packages/vant/src/dropdown-item/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-dropdown-item-z-index: 10;
 }
 
diff --git a/packages/vant/src/dropdown-menu/index.less b/packages/vant/src/dropdown-menu/index.less
index 08f4fc585..08fd94d3a 100644
--- a/packages/vant/src/dropdown-menu/index.less
+++ b/packages/vant/src/dropdown-menu/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-dropdown-menu-height: 48px;
   --van-dropdown-menu-background: var(--van-background-light);
   --van-dropdown-menu-shadow: 0 2px 12px rgba(100, 101, 102, 0.12);
diff --git a/packages/vant/src/empty/index.less b/packages/vant/src/empty/index.less
index 8f5ce07a8..0c4b6082b 100644
--- a/packages/vant/src/empty/index.less
+++ b/packages/vant/src/empty/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-empty-padding: var(--van-padding-xl) 0;
   --van-empty-image-size: 160px;
   --van-empty-description-margin-top: var(--van-padding-md);
diff --git a/packages/vant/src/field/index.less b/packages/vant/src/field/index.less
index 1b7f76ad7..d13b78897 100644
--- a/packages/vant/src/field/index.less
+++ b/packages/vant/src/field/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-field-label-width: 6.2em;
   --van-field-label-color: var(--van-gray-7);
   --van-field-label-margin-right: var(--van-padding-sm);
diff --git a/packages/vant/src/grid-item/index.less b/packages/vant/src/grid-item/index.less
index 08727b405..a1b56dd8b 100644
--- a/packages/vant/src/grid-item/index.less
+++ b/packages/vant/src/grid-item/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-grid-item-content-padding: var(--van-padding-md) var(--van-padding-xs);
   --van-grid-item-content-background: var(--van-background-light);
   --van-grid-item-content-active-color: var(--van-active-color);
diff --git a/packages/vant/src/image-preview/index.less b/packages/vant/src/image-preview/index.less
index d8ca8e75d..cc2a74658 100644
--- a/packages/vant/src/image-preview/index.less
+++ b/packages/vant/src/image-preview/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-image-preview-index-text-color: var(--van-white);
   --van-image-preview-index-font-size: var(--van-font-size-md);
   --van-image-preview-index-line-height: var(--van-line-height-md);
diff --git a/packages/vant/src/image/index.less b/packages/vant/src/image/index.less
index 60ea78adb..102f47610 100644
--- a/packages/vant/src/image/index.less
+++ b/packages/vant/src/image/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-image-placeholder-text-color: var(--van-text-color-2);
   --van-image-placeholder-font-size: var(--van-font-size-md);
   --van-image-placeholder-background: var(--van-background);
diff --git a/packages/vant/src/index-anchor/index.less b/packages/vant/src/index-anchor/index.less
index 01921b528..ba4da4a38 100644
--- a/packages/vant/src/index-anchor/index.less
+++ b/packages/vant/src/index-anchor/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-index-anchor-z-index: 1;
   --van-index-anchor-padding: 0 var(--van-padding-md);
   --van-index-anchor-text-color: var(--van-text-color);
diff --git a/packages/vant/src/index-bar/index.less b/packages/vant/src/index-bar/index.less
index c05f89d09..361fecb30 100644
--- a/packages/vant/src/index-bar/index.less
+++ b/packages/vant/src/index-bar/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-index-bar-sidebar-z-index: 2;
   --van-index-bar-index-font-size: var(--van-font-size-xs);
   --van-index-bar-index-line-height: var(--van-line-height-xs);
diff --git a/packages/vant/src/list/index.less b/packages/vant/src/list/index.less
index cf09171c3..109fd0cc0 100644
--- a/packages/vant/src/list/index.less
+++ b/packages/vant/src/list/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-list-text-color: var(--van-text-color-2);
   --van-list-text-font-size: var(--van-font-size-md);
   --van-list-text-line-height: 50px;
diff --git a/packages/vant/src/loading/index.less b/packages/vant/src/loading/index.less
index 5c795d9fb..5ec4f7174 100644
--- a/packages/vant/src/loading/index.less
+++ b/packages/vant/src/loading/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-loading-text-color: var(--van-text-color-2);
   --van-loading-text-font-size: var(--van-font-size-md);
   --van-loading-spinner-color: var(--van-gray-5);
diff --git a/packages/vant/src/nav-bar/index.less b/packages/vant/src/nav-bar/index.less
index 2e8291afa..0caea2066 100644
--- a/packages/vant/src/nav-bar/index.less
+++ b/packages/vant/src/nav-bar/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-nav-bar-height: 46px;
   --van-nav-bar-background: var(--van-background-light);
   --van-nav-bar-arrow-size: 16px;
diff --git a/packages/vant/src/notice-bar/index.less b/packages/vant/src/notice-bar/index.less
index 1da435653..3fc6aaf3a 100644
--- a/packages/vant/src/notice-bar/index.less
+++ b/packages/vant/src/notice-bar/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-notice-bar-height: 40px;
   --van-notice-bar-padding: 0 var(--van-padding-md);
   --van-notice-bar-wrapable-padding: var(--van-padding-xs) var(--van-padding-md);
diff --git a/packages/vant/src/notify/index.less b/packages/vant/src/notify/index.less
index 20c0ec8bd..8057b6d9a 100644
--- a/packages/vant/src/notify/index.less
+++ b/packages/vant/src/notify/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-notify-text-color: var(--van-white);
   --van-notify-padding: var(--van-padding-xs) var(--van-padding-md);
   --van-notify-font-size: var(--van-font-size-md);
diff --git a/packages/vant/src/number-keyboard/index.less b/packages/vant/src/number-keyboard/index.less
index e3251eb56..79c49a49a 100644
--- a/packages/vant/src/number-keyboard/index.less
+++ b/packages/vant/src/number-keyboard/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-number-keyboard-background: var(--van-gray-2);
   --van-number-keyboard-key-height: 48px;
   --van-number-keyboard-key-font-size: 28px;
@@ -16,6 +16,12 @@
   --van-number-keyboard-z-index: 100;
 }
 
+.van-theme-dark {
+  --van-number-keyboard-background: var(--van-gray-8);
+  --van-number-keyboard-key-background: var(--van-gray-7);
+  --van-number-keyboard-key-active-color: var(--van-gray-6);
+}
+
 .van-number-keyboard {
   position: fixed;
   bottom: 0;
diff --git a/packages/vant/src/overlay/index.less b/packages/vant/src/overlay/index.less
index 22c0a35d7..4b37a94bf 100644
--- a/packages/vant/src/overlay/index.less
+++ b/packages/vant/src/overlay/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-overlay-z-index: 1;
   --van-overlay-background: rgba(0, 0, 0, 0.7);
 }
diff --git a/packages/vant/src/pagination/index.less b/packages/vant/src/pagination/index.less
index 5358a5d0f..879fe9395 100644
--- a/packages/vant/src/pagination/index.less
+++ b/packages/vant/src/pagination/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-pagination-height: 40px;
   --van-pagination-font-size: var(--van-font-size-md);
   --van-pagination-item-width: 36px;
diff --git a/packages/vant/src/password-input/index.less b/packages/vant/src/password-input/index.less
index d12382536..fadbe2466 100644
--- a/packages/vant/src/password-input/index.less
+++ b/packages/vant/src/password-input/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-password-input-height: 50px;
   --van-password-input-margin: 0 var(--van-padding-md);
   --van-password-input-font-size: 20px;
diff --git a/packages/vant/src/picker/index.less b/packages/vant/src/picker/index.less
index 22e517e41..df2f517a1 100644
--- a/packages/vant/src/picker/index.less
+++ b/packages/vant/src/picker/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-picker-background: var(--van-background-light);
   --van-picker-toolbar-height: 44px;
   --van-picker-title-font-size: var(--van-font-size-lg);
@@ -21,6 +21,15 @@
     linear-gradient(0deg, rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0.4));
 }
 
+.van-theme-dark {
+  --van-picker-mask-color: linear-gradient(
+      180deg,
+      rgba(0, 0, 0, 0.6),
+      rgba(0, 0, 0, 0.1)
+    ),
+    linear-gradient(0deg, rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.1));
+}
+
 .van-picker {
   position: relative;
   background: var(--van-picker-background);
diff --git a/packages/vant/src/popover/index.less b/packages/vant/src/popover/index.less
index 82b0f4b4f..7ec4f8a6e 100644
--- a/packages/vant/src/popover/index.less
+++ b/packages/vant/src/popover/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-popover-arrow-size: 6px;
   --van-popover-radius: var(--van-radius-lg);
   --van-popover-action-width: 128px;
diff --git a/packages/vant/src/popup/index.less b/packages/vant/src/popup/index.less
index c9dd9348e..13df7e5f3 100644
--- a/packages/vant/src/popup/index.less
+++ b/packages/vant/src/popup/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-popup-background: var(--van-background-light);
   --van-popup-transition: transform var(--van-duration-base);
   --van-popup-round-radius: 16px;
diff --git a/packages/vant/src/progress/index.less b/packages/vant/src/progress/index.less
index b26bb233d..733c4be4e 100644
--- a/packages/vant/src/progress/index.less
+++ b/packages/vant/src/progress/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-progress-height: 4px;
   --van-progress-color: var(--van-primary-color);
   --van-progress-inactive-color: var(--van-gray-5);
diff --git a/packages/vant/src/pull-refresh/index.less b/packages/vant/src/pull-refresh/index.less
index 8f2e2eba5..d73272a1c 100644
--- a/packages/vant/src/pull-refresh/index.less
+++ b/packages/vant/src/pull-refresh/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-pull-refresh-head-height: 50px;
   --van-pull-refresh-head-font-size: var(--van-font-size-md);
   --van-pull-refresh-head-text-color: var(--van-text-color-2);
diff --git a/packages/vant/src/radio/index.less b/packages/vant/src/radio/index.less
index eb8f55fab..b1d97718a 100644
--- a/packages/vant/src/radio/index.less
+++ b/packages/vant/src/radio/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-radio-size: 20px;
   --van-radio-border-color: var(--van-gray-5);
   --van-radio-duration: var(--van-duration-fast);
diff --git a/packages/vant/src/rate/index.less b/packages/vant/src/rate/index.less
index a576c28f4..f4b91d650 100644
--- a/packages/vant/src/rate/index.less
+++ b/packages/vant/src/rate/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-rate-icon-size: 20px;
   --van-rate-icon-gutter: var(--van-padding-base);
   --van-rate-icon-void-color: var(--van-gray-5);
diff --git a/packages/vant/src/search/index.less b/packages/vant/src/search/index.less
index 80ae6fb34..e6dad8d1c 100644
--- a/packages/vant/src/search/index.less
+++ b/packages/vant/src/search/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-search-padding: 10px var(--van-padding-sm);
   --van-search-background: var(--van-background-light);
   --van-search-content-background: var(--van-gray-1);
diff --git a/packages/vant/src/share-sheet/index.less b/packages/vant/src/share-sheet/index.less
index 486e4d669..50aab826a 100644
--- a/packages/vant/src/share-sheet/index.less
+++ b/packages/vant/src/share-sheet/index.less
@@ -1,6 +1,6 @@
 @import '../style/mixins/hairline';
 
-:root {
+body {
   --van-share-sheet-header-padding: var(--van-padding-sm) var(--van-padding-md);
   --van-share-sheet-title-color: var(--van-text-color);
   --van-share-sheet-title-font-size: var(--van-font-size-md);
diff --git a/packages/vant/src/sidebar-item/index.less b/packages/vant/src/sidebar-item/index.less
index 473b19312..e2c7a5b00 100644
--- a/packages/vant/src/sidebar-item/index.less
+++ b/packages/vant/src/sidebar-item/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-sidebar-font-size: var(--van-font-size-md);
   --van-sidebar-line-height: var(--van-line-height-md);
   --van-sidebar-text-color: var(--van-text-color);
diff --git a/packages/vant/src/sidebar/index.less b/packages/vant/src/sidebar/index.less
index faa02e900..03bac2445 100644
--- a/packages/vant/src/sidebar/index.less
+++ b/packages/vant/src/sidebar/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-sidebar-width: 80px;
 }
 
diff --git a/packages/vant/src/skeleton/index.less b/packages/vant/src/skeleton/index.less
index 61ec79b9d..1d69c0ec4 100644
--- a/packages/vant/src/skeleton/index.less
+++ b/packages/vant/src/skeleton/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-skeleton-row-height: 16px;
   --van-skeleton-row-background: var(--van-active-color);
   --van-skeleton-row-margin-top: var(--van-padding-sm);
diff --git a/packages/vant/src/slider/index.less b/packages/vant/src/slider/index.less
index 0275d2d01..31b52d480 100644
--- a/packages/vant/src/slider/index.less
+++ b/packages/vant/src/slider/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-slider-active-background: var(--van-primary-color);
   --van-slider-inactive-background: var(--van-gray-3);
   --van-slider-disabled-opacity: var(--van-disabled-opacity);
diff --git a/packages/vant/src/step/index.less b/packages/vant/src/step/index.less
index b049619ad..811bd7613 100644
--- a/packages/vant/src/step/index.less
+++ b/packages/vant/src/step/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-step-text-color: var(--van-text-color-2);
   --van-step-active-color: var(--van-primary-color);
   --van-step-process-text-color: var(--van-text-color);
diff --git a/packages/vant/src/stepper/index.less b/packages/vant/src/stepper/index.less
index 90108f88c..dd143d5be 100644
--- a/packages/vant/src/stepper/index.less
+++ b/packages/vant/src/stepper/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-stepper-background: var(--van-active-color);
   --van-stepper-button-icon-color: var(--van-text-color);
   --van-stepper-button-disabled-color: var(--van-background);
diff --git a/packages/vant/src/steps/index.less b/packages/vant/src/steps/index.less
index 74a624389..3aa919712 100644
--- a/packages/vant/src/steps/index.less
+++ b/packages/vant/src/steps/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-steps-background: var(--van-background-light);
 }
 
diff --git a/packages/vant/src/sticky/index.less b/packages/vant/src/sticky/index.less
index 4a0e8f727..c651e2e41 100644
--- a/packages/vant/src/sticky/index.less
+++ b/packages/vant/src/sticky/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-sticky-z-index: 99;
 }
 
diff --git a/packages/vant/src/submit-bar/index.less b/packages/vant/src/submit-bar/index.less
index 966cf3a36..737961740 100644
--- a/packages/vant/src/submit-bar/index.less
+++ b/packages/vant/src/submit-bar/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-submit-bar-height: 50px;
   --van-submit-bar-z-index: 100;
   --van-submit-bar-background: var(--van-background-light);
diff --git a/packages/vant/src/swipe/index.less b/packages/vant/src/swipe/index.less
index ac866d08b..2e25c54b6 100644
--- a/packages/vant/src/swipe/index.less
+++ b/packages/vant/src/swipe/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-swipe-indicator-size: 6px;
   --van-swipe-indicator-margin: var(--van-padding-sm);
   --van-swipe-indicator-active-opacity: 1;
diff --git a/packages/vant/src/switch/index.less b/packages/vant/src/switch/index.less
index 20c7a0821..e73968c15 100644
--- a/packages/vant/src/switch/index.less
+++ b/packages/vant/src/switch/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-switch-size: 30px;
   --van-switch-width: 2em;
   --van-switch-height: 1em;
diff --git a/packages/vant/src/tabbar-item/index.less b/packages/vant/src/tabbar-item/index.less
index b25535cd9..71076f9a4 100644
--- a/packages/vant/src/tabbar-item/index.less
+++ b/packages/vant/src/tabbar-item/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-tabbar-item-font-size: var(--van-font-size-sm);
   --van-tabbar-item-text-color: var(--van-gray-7);
   --van-tabbar-item-active-color: var(--van-primary-color);
diff --git a/packages/vant/src/tabbar/index.less b/packages/vant/src/tabbar/index.less
index 2a32c851b..065542c74 100644
--- a/packages/vant/src/tabbar/index.less
+++ b/packages/vant/src/tabbar/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-tabbar-height: 50px;
   --van-tabbar-z-index: 1;
   --van-tabbar-background: var(--van-background-light);
diff --git a/packages/vant/src/tabs/index.less b/packages/vant/src/tabs/index.less
index 3c43be7e6..68ed4f70d 100644
--- a/packages/vant/src/tabs/index.less
+++ b/packages/vant/src/tabs/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-tab-text-color: var(--van-gray-7);
   --van-tab-active-text-color: var(--van-text-color);
   --van-tab-disabled-text-color: var(--van-text-color-3);
diff --git a/packages/vant/src/tag/index.less b/packages/vant/src/tag/index.less
index cabb0a381..4c72eab6e 100644
--- a/packages/vant/src/tag/index.less
+++ b/packages/vant/src/tag/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-tag-padding: 0 var(--van-padding-base);
   --van-tag-text-color: var(--van-white);
   --van-tag-font-size: var(--van-font-size-sm);
diff --git a/packages/vant/src/toast/index.less b/packages/vant/src/toast/index.less
index 18636fa84..4151ce241 100644
--- a/packages/vant/src/toast/index.less
+++ b/packages/vant/src/toast/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-toast-max-width: 70%;
   --van-toast-font-size: var(--van-font-size-md);
   --van-toast-text-color: var(--van-white);
diff --git a/packages/vant/src/tree-select/index.less b/packages/vant/src/tree-select/index.less
index 25838dc39..69d512098 100644
--- a/packages/vant/src/tree-select/index.less
+++ b/packages/vant/src/tree-select/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-tree-select-font-size: var(--van-font-size-md);
   --van-tree-select-nav-background: var(--van-background);
   --van-tree-select-content-background: var(--van-background-light);
diff --git a/packages/vant/src/uploader/index.less b/packages/vant/src/uploader/index.less
index ce0ea57a9..9204fff68 100644
--- a/packages/vant/src/uploader/index.less
+++ b/packages/vant/src/uploader/index.less
@@ -1,4 +1,4 @@
-:root {
+body {
   --van-uploader-size: 80px;
   --van-uploader-icon-size: 24px;
   --van-uploader-icon-color: var(--van-gray-4);