diff --git a/gulpfile.ts b/gulpfile.ts
index 85e5942401..331d7d6811 100644
--- a/gulpfile.ts
+++ b/gulpfile.ts
@@ -10,24 +10,22 @@ import * as babel from 'gulp-babel';
 import * as ts from 'gulp-typescript';
 import * as tslint from 'gulp-tslint';
 import * as glob from 'glob';
-import * as browserify from 'browserify';
-import * as source from 'vinyl-source-stream';
-import * as buffer from 'vinyl-buffer';
 import * as es from 'event-stream';
+import * as Webpack from 'webpack';
+import * as webpack from 'webpack-stream';
 import stylus = require('gulp-stylus');
 import cssnano = require('gulp-cssnano');
 import * as uglify from 'gulp-uglify';
 import riotify = require('riotify');
-import transformify = require('syuilo-transformify');
 import pug = require('gulp-pug');
 import git = require('git-last-commit');
 import * as rimraf from 'rimraf';
 import * as escapeHtml from 'escape-html';
 import prominence = require('prominence');
-import promiseify = require('promiseify');
 import * as chalk from 'chalk';
 import imagemin = require('gulp-imagemin');
 import * as rename from 'gulp-rename';
+import named = require('vinyl-named');
 
 const env = process.env.NODE_ENV;
 const isProduction = env === 'production';
@@ -43,8 +41,8 @@ if (!fs.existsSync('./.config/default.yml')) {
 }
 
 (global as any).MISSKEY_CONFIG_PATH = '.config/default.yml';
-import { IConfig } from './src/config';
-const config = eval(require('typescript').transpile(require('fs').readFileSync('./src/config.ts').toString()))() as IConfig;
+import { Config } from './src/config';
+const config = eval(require('typescript').transpile(require('fs').readFileSync('./src/config.ts').toString()))() as Config;
 
 const tsProject = ts.createProject('tsconfig.json');
 
@@ -150,7 +148,6 @@ gulp.task('default', ['build']);
 gulp.task('build:client', [
 	'build:ts', 'build:js',
 	'build:client:scripts',
-	'build:client:styles',
 	'build:client:pug',
 	'copy:client'
 ]);
@@ -159,69 +156,99 @@ gulp.task('build:client:scripts', () => new Promise(async (ok) => {
 	// Get commit info
 	const commit = await prominence(git).getLastCommit();
 
-	// Get all app scripts
-	const files = await promiseify(glob)('./src/web/app/*/script.js');
+	const StringReplacePlugin = require('string-replace-webpack-plugin');
 
-	// Compile for each scripts
-	const tasks = files.map(entry => {
-		let bundle =
-			browserify({
-				entries: [entry]
-			})
-			.transform(transformify((source, file) => {
-				return source
-					.replace(/VERSION/g, `'${commit ? commit.hash : 'null'}'`)
-					.replace(/\$theme\-color\-foreground/g, '#fff')
-					.replace(/\$theme\-color/g, config.themeColor)
-					.replace(/CONFIG\.theme-color/g, `'${config.themeColor}'`)
-					.replace(/CONFIG\.themeColor/g, `'${config.themeColor}'`)
-					.replace(/CONFIG\.api\.url/g, `'${config.scheme}://api.${config.host}'`)
-					.replace(/CONFIG\.urls\.about/g, `'${config.scheme}://about.${config.host}'`)
-					.replace(/CONFIG\.urls\.dev/g, `'${config.scheme}://dev.${config.host}'`)
-					.replace(/CONFIG\.url/g, `'${config.url}'`)
-					.replace(/CONFIG\.host/g, `'${config.host}'`)
-					.replace(/CONFIG\.recaptcha\.siteKey/g, `'${config.recaptcha.siteKey}'`)
-					;
-			}))
-			.transform(riotify, {
-				type: 'livescript',
-				expr: false,
-				compact: true,
-				parserOptions: {
-					style: {
-						compress: true,
-						rawDefine: config
+	/* webpack options */
+	const pack = {
+		entry: {
+			'client': './src/web/app/client/script.js',
+			'desktop': './src/web/app/desktop/script.js',
+			'mobile': './src/web/app/mobile/script.js',
+			'dev': './src/web/app/dev/script.js',
+			'auth': './src/web/app/auth/script.js'
+		},
+		module: {
+			preLoaders: [
+				{
+					test: /\.(tag|js|styl)$/,
+					exclude: /node_modules/,
+					loader: StringReplacePlugin.replace({
+						replacements: [
+							{	pattern: /VERSION/g, replacement: () => `'${commit ? commit.hash : 'null'}'` },
+							{ pattern: /\$theme\-color\-foreground/g, replacement: () => '#fff' },
+							{ pattern: /\$theme\-color/g, replacement: () => config.themeColor },
+							{ pattern: /CONFIG\.theme\-color/g, replacement: () => `'${config.themeColor}'` },
+							{ pattern: /CONFIG\.themeColor/g, replacement: () => `'${config.themeColor}'` },
+							{ pattern: /CONFIG\.api\.url/g, replacement: () => `'${config.api_url}'` },
+							{ pattern: /CONFIG\.urls\.about/g, replacement: () => `'${config.about_url}'` },
+							{ pattern: /CONFIG\.urls\.dev/g, replacement: () => `'${config.dev_url}'` },
+							{ pattern: /CONFIG\.url/g, replacement: () => `'${config.url}'` },
+							{ pattern: /CONFIG\.host/g, replacement: () => `'${config.host}'` },
+							{ pattern: /CONFIG\.recaptcha\.siteKey/g, replacement: () => `'${config.recaptcha.siteKey}'` },
+						]})
+				},
+			],
+			loaders: [
+				{
+					test: /\.tag$/,
+					exclude: /node_modules/,
+					loader: 'riot-tag-loader',
+					query: {
+						hot: false,
+						type: 'livescript',
+						style: 'stylus',
+						expr: false,
+						compact: true,
+						parserOptions: {
+							style: {
+								compress: true
+							}
+						}
 					}
+				},
+				{
+					test: /\.styl$/,
+					loaders: ['style', 'css', 'stylus']
 				}
-			})
-			.bundle()
-			.pipe(source(entry.replace('./src/web/app/', './').replace('.ls', '.js')));
-
-		if (isProduction) {
-			bundle = bundle
-				.pipe(buffer())
-				// ↓ https://github.com/mishoo/UglifyJS2/issues/448
-				.pipe(babel({
-					presets: ['es2015']
-				}))
-				.pipe(uglify({
-					compress: true
-				}));
+			]
+		},
+		plugins: [
+			new StringReplacePlugin()
+		],
+		output: {
+			filename: '[name]/script.js'
 		}
+	};
 
-		return bundle
-			.pipe(gulp.dest('./built/web/resources/'));
-	});
+	if (isProduction) {
+		// TODO.
+		// see https://github.com/webpack/webpack/issues/2545
+		//pack.plugins.push(new Webpack.optimize.UglifyJsPlugin())
+	}
 
-	es.merge(tasks).on('end', ok);
+	let stream = webpack(pack);
+
+	// TODO: remove this block
+	if (isProduction) {
+		stream = stream
+			// ↓ https://github.com/mishoo/UglifyJS2/issues/448
+			.pipe(babel({
+				presets: ['es2015']
+			}))
+			.pipe(uglify({
+				compress: true
+			}));
+	}
+
+	stream.pipe(gulp.dest('./built/web/resources/'));
+
+	ok();
 }));
 
 gulp.task('build:client:styles', () =>
-	gulp.src('./src/web/app/**/*.styl')
+	gulp.src('./src/web/app/init.styl')
 		.pipe(stylus({
-			'include css': true,
-			compress: true,
-			rawDefine: config
+			compress: true
 		}))
 		.pipe(isProduction
 			? cssnano({
@@ -232,8 +259,7 @@ gulp.task('build:client:styles', () =>
 );
 
 gulp.task('copy:client', [
-	'build:client:scripts',
-	'build:client:styles'
+	'build:client:scripts'
 ], () =>
 	gulp.src([
 		'./resources/**/*',
diff --git a/package.json b/package.json
index 4004d0a81b..92aa2f95a4 100644
--- a/package.json
+++ b/package.json
@@ -24,7 +24,6 @@
   "dependencies": {
     "@types/bcryptjs": "2.4.0",
     "@types/body-parser": "0.0.34",
-    "@types/browserify": "12.0.30",
     "@types/chai": "3.4.35",
     "@types/chai-http": "0.0.30",
     "@types/chalk": "0.4.31",
@@ -62,8 +61,8 @@
     "@types/serve-favicon": "2.2.28",
     "@types/twitter": "0.0.28",
     "@types/uuid": "2.0.29",
-    "@types/vinyl-buffer": "0.0.28",
-    "@types/vinyl-source-stream": "0.0.28",
+    "@types/webpack": "2.2.6",
+    "@types/webpack-stream": "3.2.6",
     "@types/websocket": "0.0.33",
     "autwh": "0.0.1",
     "babel-core": "6.23.1",
@@ -72,7 +71,6 @@
     "babel-preset-stage-3": "6.17.0",
     "bcryptjs": "2.4.3",
     "body-parser": "1.16.1",
-    "browserify": "14.1.0",
     "chai": "3.5.0",
     "chai-http": "3.0.0",
     "chalk": "1.1.3",
@@ -81,6 +79,7 @@
     "cors": "2.8.1",
     "cropperjs": "1.0.0-beta",
     "crypto": "0.0.3",
+    "css-loader": "0.26.1",
     "debug": "2.6.1",
     "deepcopy": "0.6.3",
     "download": "5.0.3",
@@ -123,7 +122,6 @@
     "nyaize": "0.0.2",
     "page": "1.7.1",
     "prominence": "0.2.0",
-    "promiseify": "0.2.0",
     "pug": "2.0.0-beta9",
     "ratelimiter": "2.2.0",
     "recaptcha-promise": "0.1.2",
@@ -133,15 +131,17 @@
     "rimraf": "2.6.0",
     "riot": "3.3.0",
     "riot-compiler": "3.2.0",
+    "riot-tag-loader": "1.0.0",
     "riotify": "2.0.0",
     "rndstr": "1.0.0",
     "s-age": "1.1.0",
     "serve-favicon": "2.3.2",
+    "string-replace-webpack-plugin": "0.0.5",
+    "stylus-loader": "^2.5.0",
     "subdomain": "1.2.0",
     "summaly": "2.0.0",
     "swagger-jsdoc": "1.9.1",
     "syuilo-password-strength": "0.0.1",
-    "syuilo-transformify": "0.1.2",
     "tcp-port-used": "0.1.2",
     "textarea-caret": "3.0.2",
     "tslint": "4.4.2",
@@ -149,8 +149,9 @@
     "uuid": "3.0.1",
     "velocity-animate": "1.4.2",
     "vhost": "3.0.2",
-    "vinyl-buffer": "1.0.0",
-    "vinyl-source-stream": "1.1.0",
+    "vinyl-named": "1.1.0",
+    "webpack": "2.2.1",
+    "webpack-stream": "3.2.0",
     "websocket": "1.0.24",
     "whatwg-fetch": "2.0.2",
     "xml2json": "0.11.0"
diff --git a/src/config.ts b/src/config.ts
index 54ed0826a4..64a6b7c9bf 100644
--- a/src/config.ts
+++ b/src/config.ts
@@ -79,10 +79,13 @@ interface Mixin {
 	secondary_scheme: string;
 	api_url: string;
 	auth_url: string;
+	about_url: string;
 	dev_url: string;
 	drive_url: string;
 }
 
+export type Config = Source & Mixin;
+
 export default function load() {
 	const config = yaml.safeLoad(fs.readFileSync(path, 'utf-8')) as Source;
 
@@ -104,6 +107,7 @@ export default function load() {
 	mixin.api_url = `${mixin.scheme}://api.${mixin.host}`;
 	mixin.auth_url = `${mixin.scheme}://auth.${mixin.host}`;
 	mixin.dev_url = `${mixin.scheme}://dev.${mixin.host}`;
+	mixin.about_url = `${mixin.scheme}://about.${mixin.host}`;
 	mixin.drive_url = `${mixin.secondary_scheme}://file.${mixin.secondary_host}`;
 
 	return Object.assign(config, mixin);
diff --git a/src/web/app/auth/script.js b/src/web/app/auth/script.js
index c0065c85fd..8c9138efaf 100644
--- a/src/web/app/auth/script.js
+++ b/src/web/app/auth/script.js
@@ -2,6 +2,10 @@
  * Authorize Form
  */
 
+// Style
+//import './style.styl';
+require('./style.styl');
+
 const riot = require('riot');
 document.title = 'Misskey | アプリの連携';
 require('./tags');
diff --git a/src/web/app/base.styl b/src/web/app/base.styl
index c35f66c9a5..5a1da3813f 100644
--- a/src/web/app/base.styl
+++ b/src/web/app/base.styl
@@ -1,7 +1,7 @@
 @charset 'utf-8'
 
-$theme-color = convert(themeColor)
-$theme-color-foreground = convert(themeColorForeground)
+$theme-color = #f76d6c
+$theme-color-foreground = #fff
 
 @import './reset'
 
diff --git a/src/web/app/client/script.js b/src/web/app/client/script.js
index d8531e9cc8..880500eb1b 100644
--- a/src/web/app/client/script.js
+++ b/src/web/app/client/script.js
@@ -2,18 +2,9 @@ const head = document.getElementsByTagName('head')[0];
 const ua = navigator.userAgent.toLowerCase();
 const isMobile = /mobile|iphone|ipad|android/.test(ua);
 
-if (isMobile) {
-	mountMobile();
-} else {
-	mountDesktop();
-}
+isMobile ? mountMobile() : mountDesktop();
 
 function mountDesktop() {
-	const style = document.createElement('link');
-	style.setAttribute('href', '/_/resources/desktop/style.css');
-	style.setAttribute('rel', 'stylesheet');
-	head.appendChild(style);
-
 	const script = document.createElement('script');
 	script.setAttribute('src', '/_/resources/desktop/script.js');
 	script.setAttribute('async', 'true');
@@ -27,11 +18,6 @@ function mountMobile() {
 	meta.setAttribute('content', 'width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no');
 	head.appendChild(meta);
 
-	const style = document.createElement('link');
-	style.setAttribute('href', '/_/resources/mobile/style.css');
-	style.setAttribute('rel', 'stylesheet');
-	head.appendChild(style);
-
 	const script = document.createElement('script');
 	script.setAttribute('src', '/_/resources/mobile/script.js');
 	script.setAttribute('async', 'true');
diff --git a/src/web/app/desktop/script.js b/src/web/app/desktop/script.js
index b240e9ab98..3d25e9b1d5 100644
--- a/src/web/app/desktop/script.js
+++ b/src/web/app/desktop/script.js
@@ -2,6 +2,10 @@
  * Desktop Client
  */
 
+// Style
+//import './style.styl';
+require('./style.styl');
+
 require('chart.js');
 require('./tags');
 const riot = require('riot');
diff --git a/src/web/app/dev/script.js b/src/web/app/dev/script.js
index e0644c263b..94b17c85e5 100644
--- a/src/web/app/dev/script.js
+++ b/src/web/app/dev/script.js
@@ -2,6 +2,10 @@
  * Developer Center
  */
 
+// Style
+//import './style.styl';
+require('./style.styl');
+
 require('./tags');
 const boot = require('../boot');
 const route = require('./router');
diff --git a/src/web/app/dev/style.styl b/src/web/app/dev/style.styl
index a7e51b8943..4fd537709d 100644
--- a/src/web/app/dev/style.styl
+++ b/src/web/app/dev/style.styl
@@ -2,9 +2,3 @@
 
 html
 	background-color #fff
-
-#init
-	background #100f0f
-
-	> p
-		color $theme-color
diff --git a/src/web/app/mobile/script.js b/src/web/app/mobile/script.js
index 6f732da9cc..034010b62f 100644
--- a/src/web/app/mobile/script.js
+++ b/src/web/app/mobile/script.js
@@ -2,6 +2,10 @@
  * Mobile Client
  */
 
+// Style
+//import './style.styl';
+require('./style.styl');
+
 require('./tags');
 const boot = require('../boot');
 const mixins = require('./mixins');