diff --git a/docs/devnotes.md b/docs/devnotes.md
index cf6e9a0..577c968 100644
--- a/docs/devnotes.md
+++ b/docs/devnotes.md
@@ -49,3 +49,38 @@ Use physical directions to avoid trouble, like "margin-top, margin-bottom".
 For isolating control of the UI effect, we already setup css variables `--safe-area-inset-*`. In components, you should use the variables unless you have reasons to use `env()`.
 
 Using `--safe-area-inset-*`, you can control the global value in settings (under dev mode).
+
+## Module Isolation
+
+> Write the code that can be easily removed.
+
+To limit the code impact, we organize the code based on **"topic modules"** (modules in short). Each module focus on a specific topic described by the name. Like the "accounts" contains the code about the accounts, "masto" contains the code about the masto (a library used to access mastodon) helpers.
+
+> Sidenote: This also helps easing "the landing problem". If you need something about accounts, no longer "common/accounts" and "hooks/accounts" and "helpers/accounts" and "components/accounts". Someone says this is clean - is it even if you need to jump between 6 directories for how one simple feature works?
+> And you no longer needs to think about "where to place this file (between six directories, usually)".  People often optimize their code structure too early - just like how they treat the runtime performance.
+> The worse is, it's very hard to solve this problem later, because you had sent your code to different places.
+
+There are **two special modules** in this project:
+
+One is the *platform*. This module provides foundation of this app: deals with the host platform (like SizedTextarea - auto resized textarea), provides custom platform feature (like StackedRouter - provides mobile-native navigation experience).
+
+The another is the *material*. This module provides Material styling toolkit, the stylesheets, MUI Theme, constants and components.
+
+They (and only them) can be accessed by special aliases: `~{module name}`, like the `~platform`.
+
+We discourage cross referencings between two topics. Reuse is not better than duplication. Cross referencing is still possible if required.
+
+When a tool, a file or a component is required every-elsewhere, **promoting** is required to reduce the cross referencing. Thanksfully, it's usually automated process for moving files.
+
+But, sometimes you need a redesigned (sometimes better) tool for the generic usage. Follow the idea:
+
+- Move slowly or crash. Only make the change if it's required.
+- Try to make the original part depends on your new tool, and keep the original for awhile.
+- Mark deprecated only if you think the original won't worth an existence. Reasons:
+  - Migrate to the new code only needs minor change.
+  - The original code has critical problems, like performance or compatibility.
+- Make notes. Communication is important, even with the future you.
+  - *Why* this move is decided?
+  - *What* this new tool does?
+  - *How* this tool works?
+- Clean up code regularly. Don't keep the unused code forever.
diff --git a/src/accounts/MastodonOAuth2Callback.tsx b/src/accounts/MastodonOAuth2Callback.tsx
index 0714984..398d79d 100644
--- a/src/accounts/MastodonOAuth2Callback.tsx
+++ b/src/accounts/MastodonOAuth2Callback.tsx
@@ -9,12 +9,12 @@ import {
 import { acceptAccountViaAuthCode } from "./stores";
 import { $settings } from "../settings/stores";
 import { useDocumentTitle } from "../utils";
-import cards from "../material/cards.module.css";
+import cards from "~material/cards.module.css";
 import { LinearProgress } from "@suid/material";
-import Img from "../material/Img";
+import Img from "~material/Img";
 import { createRestAPIClient } from "masto";
-import { Title } from "../material/typography";
-import { useNavigator } from "../platform/StackedRouter";
+import { Title } from "~material/typography";
+import { useNavigator } from "~platform/StackedRouter";
 
 type OAuth2CallbackParams = {
   code?: string;
diff --git a/src/accounts/SignIn.tsx b/src/accounts/SignIn.tsx
index 73fa34d..c8699d2 100644
--- a/src/accounts/SignIn.tsx
+++ b/src/accounts/SignIn.tsx
@@ -7,11 +7,11 @@ import {
   createUniqueId,
   onMount,
 } from "solid-js";
-import cards from "../material/cards.module.css";
-import TextField from "../material/TextField.js";
-import Button from "../material/Button.js";
+import cards from "~material/cards.module.css";
+import TextField from "~material/TextField.js";
+import Button from "~material/Button.js";
 import { useDocumentTitle } from "../utils";
-import { Title } from "../material/typography";
+import { Title } from "~material/typography";
 import { css } from "solid-styled";
 import { LinearProgress } from "@suid/material";
 import { createRestAPIClient } from "masto";
diff --git a/src/masto/clients.ts b/src/masto/clients.ts
index d11c7c9..43cd5ec 100644
--- a/src/masto/clients.ts
+++ b/src/masto/clients.ts
@@ -9,7 +9,7 @@ import {
 import { Account } from "../accounts/stores";
 import { createRestAPIClient, mastodon } from "masto";
 import { useLocation } from "@solidjs/router";
-import { useNavigator } from "../platform/StackedRouter";
+import { useNavigator } from "~platform/StackedRouter";
 
 const restfulCache: Record<string, mastodon.rest.Client> = {};
 
diff --git a/src/material/BottomSheet.tsx b/src/material/BottomSheet.tsx
index a5d5d90..b9a9f38 100644
--- a/src/material/BottomSheet.tsx
+++ b/src/material/BottomSheet.tsx
@@ -17,7 +17,7 @@ import {
 import {
   animateSlideInFromRight,
   animateSlideOutToRight,
-} from "../platform/anim";
+} from "~platform/anim";
 
 export type BottomSheetProps = {
   open?: boolean;
diff --git a/src/material/Menu.tsx b/src/material/Menu.tsx
index c0fe72b..931b756 100644
--- a/src/material/Menu.tsx
+++ b/src/material/Menu.tsx
@@ -14,7 +14,7 @@ import "./Menu.css";
 import {
   animateGrowFromTopRight,
   animateShrinkToTopRight,
-} from "../platform/anim";
+} from "~platform/anim";
 import type { MenuListProps } from "@suid/material/MenuList";
 
 export type Anchor = Pick<DOMRect, "top" | "left" | "right"> & { e?: number };
diff --git a/src/platform/StackedRouter.tsx b/src/platform/StackedRouter.tsx
index 0686c9b..8fde8ee 100644
--- a/src/platform/StackedRouter.tsx
+++ b/src/platform/StackedRouter.tsx
@@ -15,7 +15,7 @@ import {
 import { createStore, unwrap } from "solid-js/store";
 import "./StackedRouter.css";
 import { animateSlideInFromRight, animateSlideOutToRight } from "./anim";
-import { ANIM_CURVE_DECELERATION, ANIM_CURVE_STD } from "../material/theme";
+import { ANIM_CURVE_DECELERATION, ANIM_CURVE_STD } from "~material/theme";
 import { makeEventListener } from "@solid-primitives/event-listener";
 import { useWindowSize } from "@solid-primitives/resize-observer";
 
diff --git a/src/platform/i18n.tsx b/src/platform/i18n.tsx
index 72e791e..ade3868 100644
--- a/src/platform/i18n.tsx
+++ b/src/platform/i18n.tsx
@@ -179,7 +179,7 @@ type MergedImportedModule<T> = T extends []
 export function createStringResource<
   T extends ImportFn<Record<string, string | Template<any> | undefined>>[],
 >(...importFns: T) {
-  const language = useLanguage();
+  const language = useLanguage(); // TODO: this function costs to much, provide a global cache
   const cache: Record<string, MergedImportedModule<T>> = {};
 
   return createResource(
diff --git a/src/platform/share.tsx b/src/platform/share.tsx
index 7c98cb9..3f1d870 100644
--- a/src/platform/share.tsx
+++ b/src/platform/share.tsx
@@ -4,8 +4,8 @@ import {
   onCleanup,
   type Component,
 } from "solid-js";
-import Scaffold from "../material/Scaffold";
-import BottomSheet from "../material/BottomSheet";
+import Scaffold from "~material/Scaffold";
+import BottomSheet from "~material/BottomSheet";
 import {
   Button,
   IconButton,
@@ -14,9 +14,9 @@ import {
   Toolbar,
 } from "@suid/material";
 import { Close as CloseIcon, ContentCopy } from "@suid/icons-material";
-import { Title } from "../material/typography";
+import { Title } from "~material/typography";
 import { render } from "solid-js/web";
-import { useRootTheme } from "../material/theme";
+import { useRootTheme } from "~material/theme";
 
 const ShareBottomSheet: Component<{
   data?: ShareData;
diff --git a/src/profiles/Profile.tsx b/src/profiles/Profile.tsx
index 403a045..04aba5f 100644
--- a/src/profiles/Profile.tsx
+++ b/src/profiles/Profile.tsx
@@ -12,7 +12,7 @@ import {
   type Component,
   createMemo,
 } from "solid-js";
-import Scaffold from "../material/Scaffold";
+import Scaffold from "~material/Scaffold";
 import {
   AppBar,
   Avatar,
@@ -44,7 +44,7 @@ import {
   Subject,
   Verified,
 } from "@suid/icons-material";
-import { Body2, Title } from "../material/typography";
+import { Body2, Title } from "~material/typography";
 import { useParams } from "@solidjs/router";
 import { useSessionForAcctStr } from "../masto/clients";
 import { resolveCustomEmoji } from "../masto/toot";
@@ -52,12 +52,12 @@ import { FastAverageColor } from "fast-average-color";
 import { useWindowSize } from "@solid-primitives/resize-observer";
 import { createTimeline, createTimelineSnapshot } from "../masto/timelines";
 import TootList from "../timelines/TootList";
-import { createTimeSource, TimeSourceProvider } from "../platform/timesrc";
+import { createTimeSource, TimeSourceProvider } from "~platform/timesrc";
 import TootFilterButton from "./TootFilterButton";
-import Menu, { createManagedMenuState } from "../material/Menu";
-import { share } from "../platform/share";
+import Menu, { createManagedMenuState } from "~material/Menu";
+import { share } from "~platform/share";
 import "./Profile.css";
-import { useNavigator } from "../platform/StackedRouter";
+import { useNavigator } from "~platform/StackedRouter";
 
 const Profile: Component = () => {
   const { pop } = useNavigator();
@@ -175,12 +175,12 @@ const Profile: Component = () => {
     createRenderEffect(() => (e.innerHTML = sessionDisplayName()));
   };
 
-  const toggleSubscribeHome = async () => {
+  const toggleSubscribeHome = async (event: Event) => {
     const client = session().client;
     if (!session().account) return;
     const isSubscribed = relationship()?.following ?? false;
     mutateRelationship((x) => Object.assign({ following: !isSubscribed }, x));
-    subscribeMenuState.onClose();
+    subscribeMenuState.onClose(event);
 
     if (isSubscribed) {
       const nrel = await client.v1.accounts.$select(params.id).unfollow();
diff --git a/src/profiles/TootFilterButton.tsx b/src/profiles/TootFilterButton.tsx
index a2a98bc..e1318da 100644
--- a/src/profiles/TootFilterButton.tsx
+++ b/src/profiles/TootFilterButton.tsx
@@ -1,6 +1,6 @@
 import { Button, MenuItem, Checkbox, ListItemText } from "@suid/material";
 import { createMemo, createSignal, createUniqueId, For } from "solid-js";
-import Menu from "../material/Menu";
+import Menu from "~material/Menu";
 import { FilterList, FilterListOff } from "@suid/icons-material";
 
 type Props<Filters extends Record<string, string>> = {
diff --git a/src/settings/Language.tsx b/src/settings/Language.tsx
index 825aeca..b76495f 100644
--- a/src/settings/Language.tsx
+++ b/src/settings/Language.tsx
@@ -1,5 +1,5 @@
 import { createMemo, For, type Component, type JSX } from "solid-js";
-import Scaffold from "../material/Scaffold";
+import Scaffold from "~material/Scaffold";
 import {
   AppBar,
   IconButton,
@@ -19,12 +19,12 @@ import {
   autoMatchLangTag,
   createTranslator,
   SUPPORTED_LANGS,
-} from "../platform/i18n";
-import { Title } from "../material/typography";
+} from "~platform/i18n";
+import { Title } from "~material/typography";
 import type { Template } from "@solid-primitives/i18n";
 import { useStore } from "@nanostores/solid";
 import { $settings } from "./stores";
-import { useNavigator } from "../platform/StackedRouter";
+import { useNavigator } from "~platform/StackedRouter";
 
 const ChooseLang: Component = () => {
   const { pop } = useNavigator();
diff --git a/src/settings/Motions.tsx b/src/settings/Motions.tsx
index 5b8cabb..854e3b3 100644
--- a/src/settings/Motions.tsx
+++ b/src/settings/Motions.tsx
@@ -1,5 +1,5 @@
 import type { Component } from "solid-js";
-import Scaffold from "../material/Scaffold";
+import Scaffold from "~material/Scaffold";
 import {
   AppBar,
   Divider,
@@ -12,12 +12,12 @@ import {
   Switch,
   Toolbar,
 } from "@suid/material";
-import { Title } from "../material/typography";
+import { Title } from "~material/typography";
 import { ArrowBack } from "@suid/icons-material";
-import { createTranslator } from "../platform/i18n";
+import { createTranslator } from "~platform/i18n";
 import { useStore } from "@nanostores/solid";
 import { $settings } from "./stores";
-import { useNavigator } from "../platform/StackedRouter";
+import { useNavigator } from "~platform/StackedRouter";
 
 const Motions: Component = () => {
   const {pop} = useNavigator();
diff --git a/src/settings/Region.tsx b/src/settings/Region.tsx
index ec85e6d..ae7bd6e 100644
--- a/src/settings/Region.tsx
+++ b/src/settings/Region.tsx
@@ -1,5 +1,5 @@
 import { createMemo, For, type Component, type JSX } from "solid-js";
-import Scaffold from "../material/Scaffold";
+import Scaffold from "~material/Scaffold";
 import {
   AppBar,
   IconButton,
@@ -17,12 +17,12 @@ import {
   autoMatchRegion,
   createTranslator,
   SUPPORTED_REGIONS,
-} from "../platform/i18n";
-import { Title } from "../material/typography";
+} from "~platform/i18n";
+import { Title } from "~material/typography";
 import type { Template } from "@solid-primitives/i18n";
 import { $settings } from "./stores";
 import { useStore } from "@nanostores/solid";
-import { useNavigator } from "../platform/StackedRouter";
+import { useNavigator } from "~platform/StackedRouter";
 
 const ChooseRegion: Component = () => {
   const {pop} = useNavigator();
diff --git a/src/settings/Settings.tsx b/src/settings/Settings.tsx
index e879714..188a61d 100644
--- a/src/settings/Settings.tsx
+++ b/src/settings/Settings.tsx
@@ -1,5 +1,5 @@
 import { For, Show, type Component } from "solid-js";
-import Scaffold from "../material/Scaffold.js";
+import Scaffold from "~material/Scaffold.js";
 import {
   AppBar,
   Divider,
@@ -23,8 +23,8 @@ import {
   Refresh as RefreshIcon,
   Translate as TranslateIcon,
 } from "@suid/icons-material";
-import A from "../platform/A.js";
-import { Title } from "../material/typography.jsx";
+import A from "~platform/A.js";
+import { Title } from "~material/typography.js";
 import { css } from "solid-styled";
 import { signOut, type Account } from "../accounts/stores.js";
 import { format } from "date-fns";
@@ -35,11 +35,11 @@ import {
   autoMatchRegion,
   createTranslator,
   useDateFnLocale,
-} from "../platform/i18n.jsx";
+} from "~platform/i18n.jsx";
 import { type Template } from "@solid-primitives/i18n";
-import { useServiceWorker } from "../platform/host.js";
+import { useServiceWorker } from "~platform/host.js";
 import { useSessions } from "../masto/clients.js";
-import { useNavigator } from "../platform/StackedRouter.jsx";
+import { useNavigator } from "~platform/StackedRouter.jsx";
 
 type Inset = {
   top?: number;
diff --git a/src/timelines/ChooseTootLang.tsx b/src/timelines/ChooseTootLang.tsx
index 9d5cbb7..8177783 100644
--- a/src/timelines/ChooseTootLang.tsx
+++ b/src/timelines/ChooseTootLang.tsx
@@ -4,7 +4,7 @@ import {
   type Component,
   type JSX,
 } from "solid-js";
-import Scaffold from "../material/Scaffold";
+import Scaffold from "~material/Scaffold";
 import {
   AppBar,
   IconButton,
@@ -17,8 +17,8 @@ import {
 } from "@suid/material";
 import { Close as CloseIcon } from "@suid/icons-material";
 import iso639_1 from "iso-639-1";
-import { createTranslator } from "../platform/i18n";
-import { Title } from "../material/typography";
+import { createTranslator } from "~platform/i18n";
+import { Title } from "~material/typography";
 
 type ChooseTootLangProps = {
   code: string;
diff --git a/src/timelines/CompactToot.tsx b/src/timelines/CompactToot.tsx
index 75320ea..52bd551 100644
--- a/src/timelines/CompactToot.tsx
+++ b/src/timelines/CompactToot.tsx
@@ -2,8 +2,8 @@ import type { mastodon } from "masto";
 import { Show, type Component } from "solid-js";
 import tootStyle from "./toot.module.css";
 import { formatRelative } from "date-fns";
-import Img from "../material/Img";
-import { Body2 } from "../material/typography";
+import Img from "~material/Img";
+import { Body2 } from "~material/typography";
 import { appliedCustomEmoji } from "../masto/toot";
 import { TootPreviewCard } from "./RegularToot";
 
diff --git a/src/timelines/Home.tsx b/src/timelines/Home.tsx
index 13b59d7..b6472e1 100644
--- a/src/timelines/Home.tsx
+++ b/src/timelines/Home.tsx
@@ -6,7 +6,7 @@ import {
   createRenderEffect,
 } from "solid-js";
 import { useDocumentTitle } from "../utils";
-import Scaffold from "../material/Scaffold";
+import Scaffold from "~material/Scaffold";
 import {
   AppBar,
   ListItemSecondaryAction,
@@ -16,10 +16,10 @@ import {
   Toolbar,
 } from "@suid/material";
 import { css } from "solid-styled";
-import { TimeSourceProvider, createTimeSource } from "../platform/timesrc";
+import { TimeSourceProvider, createTimeSource } from "~platform/timesrc";
 import ProfileMenuButton from "./ProfileMenuButton";
-import Tabs from "../material/Tabs";
-import Tab from "../material/Tab";
+import Tabs from "~material/Tabs";
+import Tab from "~material/Tab";
 import { makeEventListener } from "@solid-primitives/event-listener";
 import { $settings } from "../settings/stores";
 import { useStore } from "@nanostores/solid";
diff --git a/src/timelines/ProfileMenuButton.tsx b/src/timelines/ProfileMenuButton.tsx
index 3202ae8..042b105 100644
--- a/src/timelines/ProfileMenuButton.tsx
+++ b/src/timelines/ProfileMenuButton.tsx
@@ -14,8 +14,8 @@ import {
   Star as LikeIcon,
   FeaturedPlayList as ListIcon,
 } from "@suid/icons-material";
-import A from "../platform/A";
-import Menu, { createManagedMenuState } from "../material/Menu";
+import A from "~platform/A";
+import Menu, { createManagedMenuState } from "~material/Menu";
 
 const ProfileMenuButton: ParentComponent<{
   profile?: {
diff --git a/src/timelines/PullDownToRefresh.tsx b/src/timelines/PullDownToRefresh.tsx
index 5a61b46..4f829ee 100644
--- a/src/timelines/PullDownToRefresh.tsx
+++ b/src/timelines/PullDownToRefresh.tsx
@@ -10,7 +10,7 @@ import { Refresh as RefreshIcon } from "@suid/icons-material";
 import { CircularProgress } from "@suid/material";
 import { makeEventListener } from "@solid-primitives/event-listener";
 import { createVisibilityObserver } from "@solid-primitives/intersection-observer";
-import { useIsFrameSuspended } from "../platform/StackedRouter";
+import { useIsFrameSuspended } from "~platform/StackedRouter";
 
 const PullDownToRefresh: Component<{
   loading?: boolean;
diff --git a/src/timelines/RegularToot.tsx b/src/timelines/RegularToot.tsx
index 5cabe04..3cfb40a 100644
--- a/src/timelines/RegularToot.tsx
+++ b/src/timelines/RegularToot.tsx
@@ -10,8 +10,8 @@ import {
 } from "solid-js";
 import tootStyle from "./toot.module.css";
 import { formatRelative } from "date-fns";
-import Img from "../material/Img.js";
-import { Body2 } from "../material/typography.js";
+import Img from "~material/Img.js";
+import { Body2 } from "~material/typography.js";
 import { css } from "solid-styled";
 import {
   BookmarkAddOutlined,
@@ -24,14 +24,14 @@ import {
   SmartToySharp,
   Lock,
 } from "@suid/icons-material";
-import { useTimeSource } from "../platform/timesrc.js";
+import { useTimeSource } from "~platform/timesrc.js";
 import { resolveCustomEmoji } from "../masto/toot.js";
 import { Divider } from "@suid/material";
-import cardStyle from "../material/cards.module.css";
-import Button from "../material/Button.js";
+import cardStyle from "~material/cards.module.css";
+import Button from "~material/Button.js";
 import MediaAttachmentGrid from "./toots/MediaAttachmentGrid.jsx";
-import { useDateFnLocale } from "../platform/i18n";
-import { canShare, share } from "../platform/share";
+import { useDateFnLocale } from "~platform/i18n";
+import { canShare, share } from "~platform/share";
 import { makeAcctText, useDefaultSession } from "../masto/clients";
 import TootContent from "./toots/TootContent";
 import BoostIcon from "./toots/BoostIcon";
diff --git a/src/timelines/TootBottomSheet.tsx b/src/timelines/TootBottomSheet.tsx
index 6d7992b..d38d34f 100644
--- a/src/timelines/TootBottomSheet.tsx
+++ b/src/timelines/TootBottomSheet.tsx
@@ -7,25 +7,25 @@ import {
   Show,
   type Component,
 } from "solid-js";
-import Scaffold from "../material/Scaffold";
+import Scaffold from "~material/Scaffold";
 import { AppBar, CircularProgress, IconButton, Toolbar } from "@suid/material";
-import { Title } from "../material/typography";
+import { Title } from "~material/typography";
 import { Close as CloseIcon } from "@suid/icons-material";
 import { useSessionForAcctStr } from "../masto/clients";
 import { resolveCustomEmoji } from "../masto/toot";
 import RegularToot, { findElementActionable } from "./RegularToot";
 import type { mastodon } from "masto";
-import cards from "../material/cards.module.css";
+import cards from "~material/cards.module.css";
 import { css } from "solid-styled";
-import { vibrate } from "../platform/hardware";
-import { createTimeSource, TimeSourceProvider } from "../platform/timesrc";
+import { vibrate } from "~platform/hardware";
+import { createTimeSource, TimeSourceProvider } from "~platform/timesrc";
 import TootComposer from "./TootComposer";
 import { useDocumentTitle } from "../utils";
 import { createTimelineControlsForArray } from "../masto/timelines";
 import TootList from "./TootList";
 import "./TootBottomSheet.css";
-import { useNavigator } from "../platform/StackedRouter";
-import BackButton from "../platform/BackButton";
+import { useNavigator } from "~platform/StackedRouter";
+import BackButton from "~platform/BackButton";
 
 let cachedEntry: [string, mastodon.v1.Status] | undefined;
 
diff --git a/src/timelines/TootComposer.tsx b/src/timelines/TootComposer.tsx
index 5693332..3c6b696 100644
--- a/src/timelines/TootComposer.tsx
+++ b/src/timelines/TootComposer.tsx
@@ -9,7 +9,7 @@ import {
   type JSX,
   type Ref,
 } from "solid-js";
-import Scaffold from "../material/Scaffold";
+import Scaffold from "~material/Scaffold";
 import {
   Avatar,
   Button,
@@ -41,16 +41,16 @@ import {
 } from "@suid/icons-material";
 import type { Account } from "../accounts/stores";
 import "./TootComposer.css";
-import BottomSheet from "../material/BottomSheet";
-import { useLanguage } from "../platform/i18n";
+import BottomSheet from "~material/BottomSheet";
+import { useLanguage } from "~platform/i18n";
 import iso639_1 from "iso-639-1";
 import ChooseTootLang from "./ChooseTootLang";
 import type { mastodon } from "masto";
-import cardStyles from "../material/cards.module.css";
-import Menu, { createManagedMenuState } from "../material/Menu";
+import cardStyles from "~material/cards.module.css";
+import Menu, { createManagedMenuState } from "~material/Menu";
 import { useDefaultSession } from "../masto/clients";
 import { resolveCustomEmoji } from "../masto/toot";
-import SizedTextarea from "../platform/SizedTextarea";
+import SizedTextarea from "~platform/SizedTextarea";
 
 type TootVisibility = "public" | "unlisted" | "private" | "direct";
 
diff --git a/src/timelines/TootList.tsx b/src/timelines/TootList.tsx
index 41e01f7..1509428 100644
--- a/src/timelines/TootList.tsx
+++ b/src/timelines/TootList.tsx
@@ -8,17 +8,17 @@ import {
   createMemo,
 } from "solid-js";
 import { type mastodon } from "masto";
-import { vibrate } from "../platform/hardware";
+import { vibrate } from "~platform/hardware";
 import { useDefaultSession } from "../masto/clients";
 import { setCache as setTootBottomSheetCache } from "./TootBottomSheet";
 import RegularToot, {
   findElementActionable,
   findRootToot,
 } from "./RegularToot";
-import cardStyle from "../material/cards.module.css";
+import cardStyle from "~material/cards.module.css";
 import type { ThreadNode } from "../masto/timelines";
-import { useNavigator } from "../platform/StackedRouter";
-import { ANIM_CURVE_STD } from "../material/theme";
+import { useNavigator } from "~platform/StackedRouter";
+import { ANIM_CURVE_STD } from "~material/theme";
 
 function durationOf(rect0: DOMRect, rect1: DOMRect) {
   const distancelt = Math.sqrt(
diff --git a/src/timelines/toot.module.css b/src/timelines/toot.module.css
index eae0b32..bb10964 100644
--- a/src/timelines/toot.module.css
+++ b/src/timelines/toot.module.css
@@ -136,7 +136,7 @@
 }
 
 .tootBottomActionGrp {
-  composes: cardGutSkip from "../material/cards.module.css";
+  composes: cardGutSkip from "~material/cards.module.css";
   padding-block: calc((var(--card-gut) - 10px) / 2);
 
   animation: 225ms var(--tutu-anim-curve-std) tootBottomExpanding;
diff --git a/src/timelines/toots/MediaAttachmentGrid.tsx b/src/timelines/toots/MediaAttachmentGrid.tsx
index 6977ba1..41c740e 100644
--- a/src/timelines/toots/MediaAttachmentGrid.tsx
+++ b/src/timelines/toots/MediaAttachmentGrid.tsx
@@ -18,9 +18,9 @@ import {
 } from "@solid-primitives/resize-observer";
 import { useStore } from "@nanostores/solid";
 import { $settings } from "../../settings/stores";
-import { averageColorHex } from "../../platform/blurhash";
+import { averageColorHex } from "~platform/blurhash";
 import "./MediaAttachmentGrid.css";
-import cardStyle from "../../material/cards.module.css";
+import cardStyle from "~material/cards.module.css";
 import { Preview } from "@suid/icons-material";
 import { IconButton } from "@suid/material";
 
diff --git a/src/timelines/toots/PreviewCard.tsx b/src/timelines/toots/PreviewCard.tsx
index 88a2cec..5e6780e 100644
--- a/src/timelines/toots/PreviewCard.tsx
+++ b/src/timelines/toots/PreviewCard.tsx
@@ -1,8 +1,8 @@
 import Color from "colorjs.io";
 import type { mastodon } from "masto";
 import { createEffect, createMemo, Show } from "solid-js";
-import { Title, Body1 } from "../../material/typography";
-import { averageColorHex } from "../../platform/blurhash";
+import { Title, Body1 } from "~material/typography";
+import { averageColorHex } from "~platform/blurhash";
 import "./PreviewCard.css";
 
 function onResetImg(event: Event & { currentTarget: HTMLImageElement }) {
diff --git a/src/timelines/toots/TootContent.tsx b/src/timelines/toots/TootContent.tsx
index 7a2286d..a4643a2 100644
--- a/src/timelines/toots/TootContent.tsx
+++ b/src/timelines/toots/TootContent.tsx
@@ -11,7 +11,7 @@ import { resolveCustomEmoji } from "../../masto/toot.js";
 import { makeAcctText, useDefaultSession } from "../../masto/clients.js";
 import "./TootContent.css";
 import { Button } from "@suid/material";
-import { createTranslator } from "../../platform/i18n.jsx";
+import { createTranslator } from "~platform/i18n.js";
 
 function preventDefault(event: Event) {
   event.preventDefault();
diff --git a/tsconfig.json b/tsconfig.json
index 6cc68b0..b92e528 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -12,5 +12,9 @@
     "noEmit": true,
     "isolatedModules": true,
     "resolveJsonModule": true,
+    "paths": {
+      "~platform/*": ["./src/platform/*"],
+      "~material/*": ["./src/material/*"]
+    }
   }
 }
diff --git a/vite.config.ts b/vite.config.ts
index f263da2..0e72623 100644
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -7,6 +7,7 @@ import version from "vite-plugin-package-version";
 import manifest from "./manifest.config";
 import { GetManualChunk } from "rollup";
 import devtools from "solid-devtools/vite";
+import { resolve } from "node:path";
 
 /**
  * Put all strings (/i18n/{key}.<json|js|ts>) into separated chunks based on the key.
@@ -107,6 +108,23 @@ export default defineConfig(({ mode }) => {
       }),
       version(),
     ],
+    resolve: {
+      alias: {
+        /* We don't allow directly acessing the source root,
+        because this encourage cross referencing between different
+        module and loose the isolation. (Cross referencing is still
+        possible, we don't stop it in any technical way.)
+
+        If the module is so important and is being referencing
+        everywhere in the app. Consider promoting it to the top
+        dir.
+
+        see docs/devnotes.md#module-isolation for details.
+        */
+        "~platform": resolve(__dirname, "src/platform"),
+        "~material": resolve(__dirname, "src/material"),
+      },
+    },
     server: {
       https: serverHttpCertBase
         ? {