frontend/package-lock.json

@@ -17,6 +17,7 @@
         "camelcase-keys": "^9.1.3",
         "class-variance-authority": "^0.7.1",
         "clsx": "^2.1.1",
+        "framer-motion": "^12.23.26",
         "humps": "^2.0.1",
         "lucide-react": "^0.511.0",
         "markdown-it": "^14.1.0",
@@ -3573,6 +3574,33 @@
         "url": "https://github.com/sponsors/rawify"
       }
     },
+    "node_modules/framer-motion": {
+      "version": "12.23.26",
+      "resolved": "https://registry.npmjs.org/framer-motion/-/framer-motion-12.23.26.tgz",
+      "integrity": "sha512-cPcIhgR42xBn1Uj+PzOyheMtZ73H927+uWPDVhUMqxy8UHt6Okavb6xIz9J/phFUHUj0OncR6UvMfJTXoc/LKA==",
+      "license": "MIT",
+      "dependencies": {
+        "motion-dom": "^12.23.23",
+        "motion-utils": "^12.23.6",
+        "tslib": "^2.4.0"
+      },
+      "peerDependencies": {
+        "@emotion/is-prop-valid": "*",
+        "react": "^18.0.0 || ^19.0.0",
+        "react-dom": "^18.0.0 || ^19.0.0"
+      },
+      "peerDependenciesMeta": {
+        "@emotion/is-prop-valid": {
+          "optional": true
+        },
+        "react": {
+          "optional": true
+        },
+        "react-dom": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/fsevents": {
       "version": "2.3.3",
       "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.3.3.tgz",
@@ -5216,6 +5244,21 @@
         "node": ">=16 || 14 >=14.17"
       }
     },
+    "node_modules/motion-dom": {
+      "version": "12.23.23",
+      "resolved": "https://registry.npmjs.org/motion-dom/-/motion-dom-12.23.23.tgz",
+      "integrity": "sha512-n5yolOs0TQQBRUFImrRfs/+6X4p3Q4n1dUEqt/H58Vx7OW6RF+foWEgmTVDhIWJIMXOuNNL0apKH2S16en9eiA==",
+      "license": "MIT",
+      "dependencies": {
+        "motion-utils": "^12.23.6"
+      }
+    },
+    "node_modules/motion-utils": {
+      "version": "12.23.6",
+      "resolved": "https://registry.npmjs.org/motion-utils/-/motion-utils-12.23.6.tgz",
+      "integrity": "sha512-eAWoPgr4eFEOFfg2WjIsMoqJTW6Z8MTUCgn/GZ3VRpClWBdnbjryiA3ZSNLyxCTmCQx4RmYX6jX1iWHbenUPNQ==",
+      "license": "MIT"
+    },
     "node_modules/ms": {
       "version": "2.1.3",
       "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",

frontend/package.json

@@ -19,6 +19,7 @@
     "camelcase-keys": "^9.1.3",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
+    "framer-motion": "^12.23.26",
     "humps": "^2.0.1",
     "lucide-react": "^0.511.0",
     "markdown-it": "^14.1.0",

frontend/src/components/TagDetailSidebar.tsx

@@ -1,3 +1,4 @@
+import { AnimatePresence, motion } from 'framer-motion'
 import { useEffect, useState } from 'react'
 
 import TagLink from '@/components/TagLink'
@@ -22,14 +23,19 @@ const renderTagTree = (
   const key = `${ path }-${ tag.id }`
 
   const self = (
-      <li key={key} className="mb-1">
+      <motion.li
+	  key={key}
+	  layout
+	  transition={{ duration: .2, ease: 'easeOut' }}
+	  className="mb-1">
 	<TagLink tag={tag} nestLevel={nestLevel}/>
-      </li>)
+      </motion.li>)
 
   return [self,
-	  ...(tag.children
+	  ...((tag.children
 	       ?.sort ((a, b) => a.name < b.name ? -1 : 1)
-	      .flatMap (child => renderTagTree (child, nestLevel + 1, key)) ?? [])]
+	       .flatMap (child => renderTagTree (child, nestLevel + 1, key)))
+	      ?? [])]
 }
 
 
@@ -70,13 +76,17 @@ export default (({ post }: Props) => {
   return (
       <SidebarComponent>
 	<TagSearch/>
+	<motion.div layout>
 	  {CATEGORIES.map ((cat: Category) => cat in tags && (
-	    <div className="my-3" key={cat}>
+	      <motion.div layout className="my-3" key={cat}>
 		<SubsectionTitle>{categoryNames[cat]}</SubsectionTitle>
-	      <ul>
+
+		<motion.ul layout>
+		  <AnimatePresence initial={false}>
 		    {tags[cat].map (tag => renderTagTree (tag, 0, `cat-${ cat }`))}
-	      </ul>
-	    </div>))}
+		  </AnimatePresence>
+		</motion.ul>
+	      </motion.div>))}
 	  {post && (
 	      <div>
 		<SectionTitle>情報</SectionTitle>
@@ -120,5 +130,6 @@ export default (({ post }: Props) => {
 		  </li>
 		</ul>
 	      </div>)}
+	</motion.div>
       </SidebarComponent>)
 }) satisfies FC<Props>

frontend/src/components/TagSidebar.tsx

@@ -1,4 +1,5 @@
 import axios from 'axios'
+import { AnimatePresence, motion } from 'framer-motion'
 import { useEffect, useState } from 'react'
 import { useLocation, useNavigate } from 'react-router-dom'
 
@@ -8,7 +9,6 @@ import SectionTitle from '@/components/common/SectionTitle'
 import SidebarComponent from '@/components/layout/SidebarComponent'
 import { API_BASE_URL } from '@/config'
 import { CATEGORIES } from '@/consts'
-import { cn } from '@/lib/utils'
 
 import type { FC } from 'react'
 
@@ -61,7 +61,20 @@ export default (({ posts }: Props) => {
   return (
       <SidebarComponent>
 	<TagSearch/>
-	<div className={cn (!(tagsVsbl) && 'hidden', 'md:block mt-4')}>
+
+	<AnimatePresence initial={false}>
+	  {tagsVsbl && (
+	      <motion.div
+		  key="sptags"
+		  className="md:block mt-4"
+		  variants={{ hidden:   { clipPath: 'inset(0 0 100% 0)',
+					  height:   0 },
+			      visible:  { clipPath: 'inset(0 0 0% 0)',
+					  height:   'auto'} }}
+		  initial="hidden"
+		  animate="visible"
+		  exit="hidden"
+		  transition={{ duration: .2, ease: 'easeOut' }}>
 		<SectionTitle>タグ</SectionTitle>
 		<ul>
 		  {CATEGORIES.flatMap (cat => cat in tags ? (
@@ -91,7 +104,9 @@ export default (({ posts }: Props) => {
 		       }}>
 		      ランダム
 		    </a>)}
-	</div>
+	      </motion.div>)}
+	</AnimatePresence>
+
 	<a href="#"
 	   className="md:hidden block my-2 text-center text-sm
 		      text-gray-500 hover:text-gray-400

frontend/src/components/TopNav.tsx

@@ -1,5 +1,6 @@
 import axios from 'axios'
 import toCamel from 'camelcase-keys'
+import { AnimatePresence, motion } from 'framer-motion'
 import { Fragment, useState, useEffect } from 'react'
 import { Link, useLocation } from 'react-router-dom'
 
@@ -136,8 +137,20 @@ export default (({ user }: Props) => {
 	      </Link>))}
 	</div>
 
-	<div className={cn (menuOpen ? 'flex flex-col md:hidden' : 'hidden',
-			    'bg-yellow-200 dark:bg-red-975 items-start')}>
+	<AnimatePresence initial={false}>
+	  {menuOpen && (
+	      <motion.div
+		  key="spmenu"
+		  className={cn ('flex flex-col md:hidden',
+				 'bg-yellow-200 dark:bg-red-975 items-start')}
+		  variants={{ closed: { clipPath: 'inset(0 0 100% 0)',
+					height:   0 },
+			      open:   { clipPath: 'inset(0 0 0% 0)',
+					height:   'auto' } }}
+		  initial="closed"
+		  animate="open"
+		  exit="closed"
+		  transition={{ duration: .2, ease: 'easeOut' }}>
 		<Separator/>
 		{menu.map ((item, i) => (
 		    <Fragment key={i}>
@@ -167,6 +180,7 @@ export default (({ user }: Props) => {
 		    </Fragment>))}
 		<TopNavUser user={user} sp/>
 		<Separator/>
-	</div>
+	      </motion.div>)}
+	</AnimatePresence>
       </>)
 }) satisfies FC<Props>