diff --git a/src/client/ui/classic.vue b/src/client/ui/classic.vue
new file mode 100644
index 000000000..9f8dbe5f0
--- /dev/null
+++ b/src/client/ui/classic.vue
@@ -0,0 +1,425 @@
+<template>
+<div class="mk-app" :class="{ wallpaper }">
+	<div class="contents" ref="contents" :class="{ withHeader: $store.state.titlebar }" @contextmenu.stop="onContextmenu">
+		<header v-if="$store.state.titlebar" class="header" ref="header" @click="onHeaderClick">
+			<XHeader :info="pageInfo"/>
+		</header>
+		<main ref="main">
+			<div class="content">
+				<router-view v-slot="{ Component }">
+					<transition :name="$store.state.animation ? 'page' : ''" mode="out-in" @enter="onTransition">
+						<keep-alive :include="['timeline']">
+							<component :is="Component" :ref="changePage"/>
+						</keep-alive>
+					</transition>
+				</router-view>
+			</div>
+			<div class="spacer"></div>
+		</main>
+	</div>
+
+	<XSide v-if="isDesktop" class="side" ref="side"/>
+
+	<div v-if="isDesktop" class="widgets">
+		<div ref="widgetsSpacer"></div>
+		<XWidgets @mounted="attachSticky"/>
+	</div>
+
+	<div class="buttons" :class="{ navHidden }">
+		<button class="button nav _button" @click="showNav" ref="navButton"><Fa :icon="faBars"/><i v-if="navIndicated"><Fa :icon="faCircle"/></i></button>
+		<button class="button home _button" @click="$route.name === 'index' ? top() : $router.push('/')"><Fa :icon="faHome"/></button>
+		<button class="button notifications _button" @click="$router.push('/my/notifications')"><Fa :icon="faBell"/><i v-if="$i.hasUnreadNotification"><Fa :icon="faCircle"/></i></button>
+		<button class="button widget _button" @click="widgetsShowing = true"><Fa :icon="faLayerGroup"/></button>
+		<button class="button post _button" @click="post"><Fa :icon="faPencilAlt"/></button>
+	</div>
+
+	<button class="widgetButton _button" :class="{ navHidden }" @click="widgetsShowing = true"><Fa :icon="faLayerGroup"/></button>
+
+	<transition name="tray-back">
+		<div class="tray-back _modalBg"
+			v-if="widgetsShowing"
+			@click="widgetsShowing = false"
+			@touchstart.passive="widgetsShowing = false"
+		></div>
+	</transition>
+
+	<transition name="tray">
+		<XWidgets v-if="widgetsShowing" class="tray"/>
+	</transition>
+
+	<XCommon/>
+</div>
+</template>
+
+<script lang="ts">
+import { defineComponent, defineAsyncComponent } from 'vue';
+import { faLayerGroup, faBars, faHome, faCircle, faWindowMaximize, faColumns, faPencilAlt } from '@fortawesome/free-solid-svg-icons';
+import { faBell } from '@fortawesome/free-regular-svg-icons';
+import { instanceName } from '@/config';
+import { StickySidebar } from '@/scripts/sticky-sidebar';
+import XSidebar from '@/components/sidebar.vue';
+import XCommon from './_common_/common.vue';
+import XHeader from './_common_/header.vue';
+import XSide from './default.side.vue';
+import * as os from '@/os';
+import { sidebarDef } from '@/sidebar';
+
+const DESKTOP_THRESHOLD = 1100;
+
+export default defineComponent({
+	components: {
+		XCommon,
+		XSidebar,
+		XHeader,
+		XWidgets: defineAsyncComponent(() => import('./default.widgets.vue')),
+		XSide, // NOTE: dynamic importするとAsyncComponentWrapperが間に入るせいでref取得できなくて面倒になる
+	},
+
+	provide() {
+		return {
+			sideViewHook: this.isDesktop ? (url) => {
+				this.$refs.side.navigate(url);
+			} : null
+		};
+	},
+
+	data() {
+		return {
+			pageInfo: null,
+			isDesktop: window.innerWidth >= DESKTOP_THRESHOLD,
+			menuDef: sidebarDef,
+			navHidden: false,
+			widgetsShowing: false,
+			wallpaper: localStorage.getItem('wallpaper') != null,
+			faLayerGroup, faBars, faBell, faHome, faCircle, faPencilAlt,
+		};
+	},
+
+	computed: {
+		navIndicated(): boolean {
+			for (const def in this.menuDef) {
+				if (def === 'notifications') continue; // 通知は下にボタンとして表示されてるから
+				if (this.menuDef[def].indicated) return true;
+			}
+			return false;
+		}
+	},
+
+	created() {
+		document.documentElement.style.overflowY = 'scroll';
+
+		if (this.$store.state.widgets.length === 0) {
+			this.$store.set('widgets', [{
+				name: 'calendar',
+				id: 'a', place: 'right', data: {}
+			}, {
+				name: 'notifications',
+				id: 'b', place: 'right', data: {}
+			}, {
+				name: 'trends',
+				id: 'c', place: 'right', data: {}
+			}]);
+		}
+	},
+
+	mounted() {
+		this.adjustUI();
+
+		const ro = new ResizeObserver((entries, observer) => {
+			this.adjustUI();
+		});
+
+		ro.observe(this.$refs.contents);
+
+		window.addEventListener('resize', this.adjustUI, { passive: true });
+
+		if (!this.isDesktop) {
+			window.addEventListener('resize', () => {
+				if (window.innerWidth >= DESKTOP_THRESHOLD) this.isDesktop = true;
+			}, { passive: true });
+		}
+	},
+
+	methods: {
+		changePage(page) {
+			if (page == null) return;
+			if (page.INFO) {
+				this.pageInfo = page.INFO;
+				document.title = `${this.pageInfo.title} | ${instanceName}`;
+			}
+		},
+
+		adjustUI() {
+			const navWidth = this.$refs.nav.$el.offsetWidth;
+			this.navHidden = navWidth === 0;
+			if (this.$refs.contents == null) return;
+			const width = this.$refs.contents.offsetWidth;
+			if (this.$refs.header) this.$refs.header.style.width = `${width}px`;
+		},
+
+		showNav() {
+			this.$refs.nav.show();
+		},
+
+		attachSticky(el) {
+			const sticky = new StickySidebar(el, this.$refs.widgetsSpacer);
+			window.addEventListener('scroll', () => {
+				sticky.calc(window.scrollY);
+			}, { passive: true });
+		},
+
+		post() {
+			os.post();
+		},
+
+		top() {
+			window.scroll({ top: 0, behavior: 'smooth' });
+		},
+
+		onTransition() {
+			if (window._scroll) window._scroll();
+		},
+
+		onHeaderClick() {
+			window.scroll({ top: 0, behavior: 'smooth' });
+		},
+
+		onContextmenu(e) {
+			if (['INPUT', 'TEXTAREA'].includes(e.target.tagName) || e.target.attributes['contenteditable']) return;
+			if (window.getSelection().toString() !== '') return;
+			const path = this.$route.path;
+			os.contextMenu([{
+				type: 'label',
+				text: path,
+			}, {
+				icon: faColumns,
+				text: this.$ts.openInSideView,
+				action: () => {
+					this.$refs.side.navigate(path);
+				}
+			}, {
+				icon: faWindowMaximize,
+				text: this.$ts.openInWindow,
+				action: () => {
+					os.pageWindow(path);
+				}
+			}], e);
+		},
+	}
+});
+</script>
+
+<style lang="scss" scoped>
+.tray-enter-active,
+.tray-leave-active {
+	opacity: 1;
+	transform: translateX(0);
+	transition: transform 300ms cubic-bezier(0.23, 1, 0.32, 1), opacity 300ms cubic-bezier(0.23, 1, 0.32, 1);
+}
+.tray-enter-from,
+.tray-leave-active {
+	opacity: 0;
+	transform: translateX(240px);
+}
+
+.tray-back-enter-active,
+.tray-back-leave-active {
+	opacity: 1;
+	transition: opacity 300ms cubic-bezier(0.23, 1, 0.32, 1);
+}
+.tray-back-enter-from,
+.tray-back-leave-active {
+	opacity: 0;
+}
+
+.mk-app {
+	$header-height: 58px; // TODO: どこかに集約したい
+	$ui-font-size: 1em; // TODO: どこかに集約したい
+	$widgets-hide-threshold: 1090px;
+
+	// ほんとは単に 100vh と書きたいところだが... https://css-tricks.com/the-trick-to-viewport-units-on-mobile/
+	min-height: calc(var(--vh, 1vh) * 100);
+	box-sizing: border-box;
+	display: flex;
+
+	&.wallpaper {
+		background: var(--wallpaperOverlay);
+		//backdrop-filter: blur(4px);
+	}
+
+	> .contents {
+		width: 100%;
+		min-width: 0;
+
+		&.withHeader {
+			padding-top: $header-height;
+		}
+
+		> .header {
+			position: fixed;
+			z-index: 1000;
+			top: 0;
+			height: $header-height;
+			width: 100%;
+			line-height: $header-height;
+			text-align: center;
+			font-weight: bold;
+			//background-color: var(--panel);
+			-webkit-backdrop-filter: blur(32px);
+			backdrop-filter: blur(32px);
+			background-color: var(--header);
+			//border-bottom: solid 1px var(--divider);
+			user-select: none;
+		}
+
+		> main {
+			min-width: 0;
+
+			> .content {
+				> * {
+					// ほんとは単に calc(100vh - #{$header-height}) と書きたいところだが... https://css-tricks.com/the-trick-to-viewport-units-on-mobile/
+					min-height: calc((var(--vh, 1vh) * 100) - #{$header-height});
+				}
+			}
+
+			> .spacer {
+				height: 82px;
+
+				@media (min-width: ($widgets-hide-threshold + 1px)) {
+					display: none;
+				}
+			}
+		}
+	}
+
+	> .side {
+		min-width: 370px;
+		max-width: 370px;
+		border-left: solid 1px var(--divider);
+	}
+
+	> .widgets {
+		padding: 0 var(--margin);
+		border-left: solid 1px var(--divider);
+
+		@media (max-width: $widgets-hide-threshold) {
+			display: none;
+		}
+	}
+
+	> .widgetButton {
+		display: block;
+		position: fixed;
+		z-index: 1000;
+		bottom: 32px;
+		right: 32px;
+		width: 64px;
+		height: 64px;
+		border-radius: 100%;
+		box-shadow: 0 3px 5px -1px rgba(0, 0, 0, 0.2), 0 6px 10px 0 rgba(0, 0, 0, 0.14), 0 1px 18px 0 rgba(0, 0, 0, 0.12);
+		font-size: 22px;
+		background: var(--panel);
+
+		&.navHidden {
+			display: none;
+		}
+
+		@media (min-width: ($widgets-hide-threshold + 1px)) {
+			display: none;
+		}
+	}
+
+	> .buttons {
+		position: fixed;
+		z-index: 1000;
+		bottom: 0;
+		padding: 16px;
+		display: flex;
+		width: 100%;
+		box-sizing: border-box;
+		-webkit-backdrop-filter: blur(32px);
+		backdrop-filter: blur(32px);
+		background-color: var(--header);
+
+		&:not(.navHidden) {
+			display: none;
+		}
+
+		> .button {
+			position: relative;
+			flex: 1;
+			padding: 0;
+			margin: auto;
+			height: 64px;
+			border-radius: 8px;
+			background: var(--panel);
+			color: var(--fg);
+
+			&:not(:last-child) {
+				margin-right: 12px;
+			}
+
+			@media (max-width: 400px) {
+				height: 60px;
+
+				&:not(:last-child) {
+					margin-right: 8px;
+				}
+			}
+
+			&:hover {
+				background: var(--X2);
+			}
+
+			> i {
+				position: absolute;
+				top: 0;
+				left: 0;
+				color: var(--indicator);
+				font-size: 16px;
+				animation: blink 1s infinite;
+			}
+
+			&:first-child {
+				margin-left: 0;
+			}
+
+			&:last-child {
+				margin-right: 0;
+			}
+
+			> * {
+				font-size: 22px;
+			}
+
+			&:disabled {
+				cursor: default;
+
+				> * {
+					opacity: 0.5;
+				}
+			}
+		}
+	}
+
+	> .tray-back {
+		z-index: 1001;
+	}
+
+	> .tray {
+		position: fixed;
+		top: 0;
+		right: 0;
+		z-index: 1001;
+		// ほんとは単に 100vh と書きたいところだが... https://css-tricks.com/the-trick-to-viewport-units-on-mobile/
+		height: calc(var(--vh, 1vh) * 100);
+		padding: var(--margin);
+		box-sizing: border-box;
+		overflow: auto;
+		background: var(--bg);
+	}
+}
+</style>
+
+<style lang="scss">
+</style>