diff --git a/.vscode/settings.json b/.vscode/settings.json
index bf80054..7e0ee1b 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -9,5 +9,9 @@
     },
     "[css]": {
         "editor.defaultFormatter": "rvest.vs-code-prettier-eslint"
-    }
+    },
+    "tailwindCSS.classFunctions": [
+        "cva",
+        "cx"
+    ]
 }
\ No newline at end of file
diff --git a/src/app/(features)/srt-player/components/atoms/FileInput.tsx b/src/app/(features)/srt-player/components/atoms/FileInput.tsx
index fcf0e43..5145137 100644
--- a/src/app/(features)/srt-player/components/atoms/FileInput.tsx
+++ b/src/app/(features)/srt-player/components/atoms/FileInput.tsx
@@ -1,7 +1,7 @@
 "use client";
 
 import React, { useRef } from "react";
-import { Button } from "@/design-system/base/button";
+import { LightButton } from "@/design-system/base/button";
 import { FileInputProps } from "../../types/controls";
 
 interface FileInputComponentProps extends FileInputProps {
@@ -34,15 +34,14 @@ export function FileInput({ accept, onFileSelect, disabled, className, children
         disabled={disabled}
         className="hidden"
       />
-      <Button
+      <LightButton
         onClick={handleClick}
         disabled={disabled}
-        variant="secondary"
         size="sm"
         className={className}
       >
         {children}
-      </Button>
+      </LightButton>
     </>
   );
 }
\ No newline at end of file
diff --git a/src/app/folders/FoldersClient.tsx b/src/app/folders/FoldersClient.tsx
index faba006..5d91837 100644
--- a/src/app/folders/FoldersClient.tsx
+++ b/src/app/folders/FoldersClient.tsx
@@ -7,7 +7,7 @@ import {
   FolderPlus,
   Trash2,
 } from "lucide-react";
-import { CircleButton, DashedButton } from "@/design-system/base/button";
+import { CircleButton, LightButton } from "@/design-system/base/button";
 import { useEffect, useState } from "react";
 import { useRouter } from "next/navigation";
 import { useTranslations } from "next-intl";
@@ -135,7 +135,7 @@ export function FoldersClient({ userId }: { userId: string; }) {
       <PageHeader title={t("title")} subtitle={t("subtitle")} />
 
       {/* 新建文件夹按钮 */}
-      <DashedButton
+      <LightButton
         onClick={async () => {
           const folderName = prompt(t("enterFolderName"));
           if (!folderName) return;
@@ -154,11 +154,11 @@ export function FoldersClient({ userId }: { userId: string; }) {
           }
         }}
         disabled={loading}
-        className="w-full"
+        className="w-full border-dashed"
       >
         <FolderPlus size={18} />
         <span>{loading ? t("creating") : t("newFolder")}</span>
-      </DashedButton>
+      </LightButton>
 
       {/* 文件夹列表 */}
       <div className="mt-4">
diff --git a/src/app/folders/[folder_id]/InFolder.tsx b/src/app/folders/[folder_id]/InFolder.tsx
index 1821c23..f13a3c2 100644
--- a/src/app/folders/[folder_id]/InFolder.tsx
+++ b/src/app/folders/[folder_id]/InFolder.tsx
@@ -7,7 +7,7 @@ import { AddTextPairModal } from "./AddTextPairModal";
 import { TextPairCard } from "./TextPairCard";
 import { useTranslations } from "next-intl";
 import { PageLayout } from "@/components/ui/PageLayout";
-import { PrimaryButton, IconButton, LinkButton } from "@/design-system/base/button";
+import { PrimaryButton, CircleButton, LinkButton } from "@/design-system/base/button";
 import { CardList } from "@/components/ui/CardList";
 import { actionCreatePair, actionDeletePairById, actionGetPairsByFolderId } from "@/modules/folder/folder-aciton";
 import { TSharedPair } from "@/shared/folder-type";
@@ -81,12 +81,13 @@ export function InFolder({ folderId, isReadOnly }: { folderId: number; isReadOnl
               {t("memorize")}
             </PrimaryButton>
             {!isReadOnly && (
-              <IconButton
+              <CircleButton
                 onClick={() => {
                   setAddModal(true);
                 }}
-                icon={<Plus size={18} className="text-gray-700" />}
-              />
+              >
+                <Plus size={18} className="text-gray-700" />
+              </CircleButton>
             )}
           </div>
         </div>
diff --git a/src/components/layout/LanguageSettings.tsx b/src/components/layout/LanguageSettings.tsx
index 64739c4..90ff5a8 100644
--- a/src/components/layout/LanguageSettings.tsx
+++ b/src/components/layout/LanguageSettings.tsx
@@ -15,7 +15,12 @@ export function LanguageSettings() {
     };
     return (
         <>
-            <Languages onClick={handleLanguageClick} size={28} className="text-white hover:text-white/80" />
+            <GhostLightButton
+                size="md"
+                onClick={handleLanguageClick}
+            >
+                <Languages size={20} />
+            </GhostLightButton>
             <div className="relative">
                 {showLanguageMenu && (
                     <div>
diff --git a/src/components/ui/index.ts b/src/components/ui/index.ts
index efb798b..24bee35 100644
--- a/src/components/ui/index.ts
+++ b/src/components/ui/index.ts
@@ -9,20 +9,12 @@ export { Card, type CardVariant, type CardPadding, type CardProps } from '@/desi
 export {
   Button,
   PrimaryButton,
-  SecondaryButton,
   LightButton,
-  SuccessButton,
-  WarningButton,
-  ErrorButton,
-  GhostButton,
   GhostLightButton,
-  OutlineButton,
   LinkButton,
-  IconButton,
   IconClick,
   CircleButton,
   CircleToggleButton,
-  DashedButton,
   type ButtonVariant,
   type ButtonSize,
   type ButtonProps
diff --git a/src/design-system/base/button/button.tsx b/src/design-system/base/button/button.tsx
index d307e98..58c5c6b 100644
--- a/src/design-system/base/button/button.tsx
+++ b/src/design-system/base/button/button.tsx
@@ -41,7 +41,7 @@ import { cn } from "@/design-system/lib/utils";
  */
 const buttonVariants = cva(
   // 基础样式
-  "border flex-inline items-center justify-center gap-2 rounded-md font-semibold shadow transition-all duration-250 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary-500 focus-visible:ring-offset-2 disabled:pointer-events-none disabled:opacity-50",
+  "inline-flex items-center justify-center gap-2 rounded-md font-semibold shadow leading-none transition-all duration-250 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-primary-500 focus-visible:ring-offset-2 disabled:pointer-events-none disabled:opacity-50",
   {
     variants: {
       variant: {
@@ -56,9 +56,9 @@ const buttonVariants = cva(
         link: "text-primary-500 hover:text-primary-600 hover:underline shadow-none px-0",
       },
       size: {
-        sm: "h-8 px-3 text-sm",
-        md: "h-10 px-4 text-base",
-        lg: "h-12 px-6 text-lg",
+        sm: "px-2.5 py-1.5 text-sm",
+        md: "px-4 py-2 text-base",
+        lg: "px-6 py-3 text-lg",
       },
       fullWidth: {
         true: "w-full",
@@ -248,50 +248,22 @@ export const PrimaryButton = (props: Omit<ButtonProps, "variant">) => (
   <Button variant="primary" {...props} />
 );
 
-export const SecondaryButton = (props: Omit<ButtonProps, "variant">) => (
+// LightButton: 次要按钮
+export const LightButton = (props: Omit<ButtonProps, "variant">) => (
   <Button variant="secondary" {...props} />
 );
 
-// LightButton: 次要按钮的别名（向后兼容）
-export const LightButton = SecondaryButton;
-
-export const SuccessButton = (props: Omit<ButtonProps, "variant">) => (
-  <Button variant="success" {...props} />
-);
-
-export const WarningButton = (props: Omit<ButtonProps, "variant">) => (
-  <Button variant="warning" {...props} />
-);
-
-export const ErrorButton = (props: Omit<ButtonProps, "variant">) => (
-  <Button variant="error" {...props} />
-);
-
-export const GhostButton = (props: Omit<ButtonProps, "variant">) => (
-  <Button variant="ghost" {...props} />
-);
-
 // GhostLightButton: 透明按钮（白色文字，用于深色背景）
 export const GhostLightButton = (props: Omit<ButtonProps, "variant">) => (
   <Button variant="ghost-light" {...props} />
 );
 
-export const OutlineButton = (props: Omit<ButtonProps, "variant">) => (
-  <Button variant="outline" {...props} />
-);
-
 export const LinkButton = (props: Omit<ButtonProps, "variant">) => (
   <Button variant="link" {...props} />
 );
 
 // ========== 其他便捷组件 ==========
 
-// IconButton: SVG 图标按钮（使用 ghost 变体）
-export const IconButton = (props: Omit<ButtonProps, "variant"> & { icon?: React.ReactNode }) => {
-  const { icon, ...rest } = props;
-  return <Button variant="ghost" leftIcon={icon} {...rest} />;
-};
-
 // IconClick: 图片图标按钮（支持 Next.js Image）
 export const IconClick = (props: Omit<ButtonProps, "variant"> & {
   src?: string;
@@ -344,8 +316,3 @@ export const CircleToggleButton = (props: Omit<ButtonProps, "variant"> & { selec
     </Button>
   );
 };
-
-// DashedButton: 虚线边框按钮（使用 outline 变体近似）
-export const DashedButton = (props: Omit<ButtonProps, "variant">) => (
-  <Button variant="outline" className="border-dashed" {...props} />
-);