diff --git a/gulpfile.ts b/gulpfile.ts
index e70e13798..30812bead 100644
--- a/gulpfile.ts
+++ b/gulpfile.ts
@@ -12,7 +12,6 @@ import * as tslint from 'gulp-tslint';
 import * as glob from 'glob';
 import * as es from 'event-stream';
 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');
@@ -160,29 +159,40 @@ gulp.task('build:client:scripts', () => new Promise(async (ok) => {
 	// TODO: remove this block
 	if (isProduction) {
 		stream = stream
+			// ↓ https://github.com/mishoo/UglifyJS2/issues/448
+			.pipe(babel({
+				presets: ['es2015']
+			}))
+			.pipe(uglify());
+	}
+
+	let entryPointStream = gulp.src('./src/web/app/client/script.js');
+
+	if (isProduction) {
+		entryPointStream = entryPointStream
 			// ↓ https://github.com/mishoo/UglifyJS2/issues/448
 			.pipe(babel({
 				presets: ['es2015']
 			}))
 			.pipe(uglify({
-				compress: true
+				mangle: {
+					toplevel: true
+				}
 			}));
 	}
 
-	stream.pipe(gulp.dest('./built/web/resources/'));
+	es.merge(
+		stream.pipe(gulp.dest('./built/web/resources/')),
+		entryPointStream.pipe(gulp.dest('./built/web/resources/client/'))
+	);
 
 	ok();
 }));
 
 gulp.task('build:client:styles', () =>
-	gulp.src('./src/web/app/init.styl')
-		.pipe(stylus({
-			compress: true
-		}))
+	gulp.src('./src/web/app/init.css')
 		.pipe(isProduction
-			? cssnano({
-				safe: true // 高度な圧縮は無効にする (一部デザインが不適切になる場合があるため)
-			})
+			? cssnano()
 			: gutil.noop())
 		.pipe(gulp.dest('./built/web/resources/'))
 );
diff --git a/package.json b/package.json
index 92aa2f95a..153f63eb9 100644
--- a/package.json
+++ b/package.json
@@ -101,7 +101,6 @@
     "gulp-pug": "3.2.0",
     "gulp-rename": "1.2.2",
     "gulp-replace": "0.5.4",
-    "gulp-stylus": "2.6.0",
     "gulp-tslint": "7.1.0",
     "gulp-typescript": "3.1.5",
     "gulp-uglify": "2.0.1",
diff --git a/src/web/app/init.css b/src/web/app/init.css
new file mode 100644
index 000000000..2a277a9c8
--- /dev/null
+++ b/src/web/app/init.css
@@ -0,0 +1,62 @@
+@charset 'utf-8';
+
+html {
+	font-family: sans-serif;
+}
+
+body > noscript > div {
+	position: fixed;
+	z-index: 32768;
+	top: 0;
+	left: 0;
+	width: 100%;
+	height: 100%;
+	text-align: center;
+	background: #fff;
+}
+	body > noscript > div > p {
+		display: block;
+		margin: 32px;
+		font-size: 2em;
+		color: #555;
+	}
+
+#init {
+	position: fixed;
+	z-index: 16384;
+	top: 0;
+	left: 0;
+	width: 100%;
+	height: 100%;
+	text-align: center;
+	background: #fff;
+	cursor: wait;
+}
+	#init > p {
+		display: block;
+		user-select: none;
+		margin: 32px;
+		font-size: 4em;
+		color: #555;
+	}
+		#init > p > span {
+			animation: init 1.4s infinite ease-in-out both;
+		}
+		#init > p > span:nth-child(1) {
+			animation-delay: 0s;
+		}
+		#init > p > span:nth-child(2) {
+			animation-delay: 0.16s;
+		}
+		#init > p > span:nth-child(3) {
+			animation-delay: 0.32s;
+		}
+
+@keyframes init {
+	0%, 80%, 100% {
+		opacity: 1;
+	}
+	40% {
+		opacity: 0;
+	}
+}
diff --git a/src/web/app/init.styl b/src/web/app/init.styl
deleted file mode 100644
index 972997725..000000000
--- a/src/web/app/init.styl
+++ /dev/null
@@ -1,56 +0,0 @@
-@charset 'utf-8'
-
-html
-	font-family sans-serif
-
-body > noscript > div
-	position fixed
-	z-index 32768
-	top 0
-	left 0
-	width 100%
-	height 100%
-	text-align center
-	background #fff
-
-	> p
-		display block
-		margin 32px
-		font-size 2em
-		color #555
-
-#init
-	position fixed
-	z-index 16384
-	top 0
-	left 0
-	width 100%
-	height 100%
-	text-align center
-	background #fff
-	cursor wait
-
-	> p
-		display block
-		user-select none
-		margin 32px
-		font-size 4em
-		color #555
-
-		> span
-			animation init 1.4s infinite ease-in-out both
-
-			&:nth-child(1)
-				animation-delay 0s
-
-			&:nth-child(2)
-				animation-delay 0.16s
-
-			&:nth-child(3)
-				animation-delay 0.32s
-
-		@keyframes init
-			0%, 80%, 100%
-				opacity 1
-			40%
-				opacity 0
diff --git a/webpack.config.ts b/webpack.config.ts
index 03c8007cd..195c433a9 100644
--- a/webpack.config.ts
+++ b/webpack.config.ts
@@ -7,7 +7,6 @@ module.exports = (config, commit, env) => {
 
 	const pack: webpack.Configuration = {
 		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',