diff --git a/packages/frontend-embed/src/components/EmMediaImage.vue b/packages/frontend-embed/src/components/EmMediaImage.vue
index d711020a74..2c96ce3215 100644
--- a/packages/frontend-embed/src/components/EmMediaImage.vue
+++ b/packages/frontend-embed/src/components/EmMediaImage.vue
@@ -95,7 +95,7 @@ async function onclick(ev: MouseEvent) {
 	position: absolute;
 	border-radius: 6px;
 	background-color: var(--MI_THEME-fg);
-	color: var(--MI_THEME-accentLighten);
+	color: hsl(from var(--MI_THEME-accent) h s calc(l + 10));
 	font-size: 12px;
 	opacity: .5;
 	padding: 5px 8px;
@@ -153,7 +153,7 @@ html[data-color-scheme=light] .visible {
 	/* Hardcode to black because either --MI_THEME-bg or --MI_THEME-fg makes it hard to read in dark/light mode */
 	background-color: black;
 	border-radius: 6px;
-	color: var(--MI_THEME-accentLighten);
+	color: hsl(from var(--MI_THEME-accent) h s calc(l + 10));
 	display: inline-block;
 	font-weight: bold;
 	font-size: 0.8em;
diff --git a/packages/frontend-embed/src/style.scss b/packages/frontend-embed/src/style.scss
index 2e43cfd20a..b67f929933 100644
--- a/packages/frontend-embed/src/style.scss
+++ b/packages/frontend-embed/src/style.scss
@@ -278,7 +278,7 @@ rt {
 }
 
 ._acrylic {
-	background: var(--MI_THEME-acrylicPanel);
+	background: color(from var(--MI_THEME-panel) srgb r g b / 0.5);
 	-webkit-backdrop-filter: var(--MI-blur, blur(15px));
 	backdrop-filter: var(--MI-blur, blur(15px));
 }
diff --git a/packages/frontend-shared/themes/_dark.json5 b/packages/frontend-shared/themes/_dark.json5
index f2d8a7aed8..90507dd007 100644
--- a/packages/frontend-shared/themes/_dark.json5
+++ b/packages/frontend-shared/themes/_dark.json5
@@ -10,8 +10,6 @@
 
 	props: {
 		accent: '#86b300',
-		accentDarken: ':darken<10<@accent',
-		accentLighten: ':lighten<10<@accent',
 		accentedBg: ':alpha<0.15<@accent',
 		love: '#dd2e44',
 		focus: ':alpha<0.3<@accent',
@@ -31,7 +29,6 @@
 		panelHeaderFg: '@fg',
 		panelHeaderDivider: 'rgba(0, 0, 0, 0)',
 		panelBorder: '" solid 1px var(--MI_THEME-divider)',
-		acrylicPanel: ':alpha<0.5<@panel',
 		windowHeader: ':alpha<0.85<@panel',
 		popup: ':lighten<3<@panel',
 		shadow: 'rgba(0, 0, 0, 0.3)',
diff --git a/packages/frontend-shared/themes/_light.json5 b/packages/frontend-shared/themes/_light.json5
index 22893bf4b3..0129e7bf83 100644
--- a/packages/frontend-shared/themes/_light.json5
+++ b/packages/frontend-shared/themes/_light.json5
@@ -10,8 +10,6 @@
 
 	props: {
 		accent: '#86b300',
-		accentDarken: ':darken<10<@accent',
-		accentLighten: ':lighten<10<@accent',
 		accentedBg: ':alpha<0.15<@accent',
 		love: '#dd2e44',
 		focus: ':alpha<0.3<@accent',
@@ -31,7 +29,6 @@
 		panelHeaderFg: '@fg',
 		panelHeaderDivider: 'rgba(0, 0, 0, 0)',
 		panelBorder: '" solid 1px var(--MI_THEME-divider)',
-		acrylicPanel: ':alpha<0.5<@panel',
 		windowHeader: ':alpha<0.85<@panel',
 		popup: ':lighten<3<@panel',
 		shadow: 'rgba(0, 0, 0, 0.1)',
diff --git a/packages/frontend-shared/themes/d-astro.json5 b/packages/frontend-shared/themes/d-astro.json5
index e8864df336..6196753b2a 100644
--- a/packages/frontend-shared/themes/d-astro.json5
+++ b/packages/frontend-shared/themes/d-astro.json5
@@ -37,10 +37,7 @@
 		inputBorder: 'rgba(255, 255, 255, 0.1)',
 		inputBorderHover: 'rgba(255, 255, 255, 0.2)',
 		panelBorder: '" solid 1px var(--MI_THEME-divider)',
-		accentDarken: ':darken<10<@accent',
-		acrylicPanel: ':alpha<0.5<@panel',
 		navIndicator: '@accent',
-		accentLighten: ':lighten<10<@accent',
 		buttonGradateA: '@accent',
 		buttonGradateB: ':hue<-20<@accent',
 		driveFolderBg: ':alpha<0.3<@accent',
diff --git a/packages/frontend-shared/themes/d-u0.json5 b/packages/frontend-shared/themes/d-u0.json5
index 0223b1fb5c..6e1f33ce0f 100644
--- a/packages/frontend-shared/themes/d-u0.json5
+++ b/packages/frontend-shared/themes/d-u0.json5
@@ -48,10 +48,7 @@
 		dateLabelFg: '@fg',
 		inputBorder: 'rgba(255, 255, 255, 0.1)',
 		panelBorder: '" solid 1px var(--MI_THEME-divider)',
-		accentDarken: ':darken<10<@accent',
-		acrylicPanel: ':alpha<0.5<@panel',
 		navIndicator: '@indicator',
-		accentLighten: ':lighten<10<@accent',
 		driveFolderBg: ':alpha<0.3<@accent',
 		fgHighlighted: ':lighten<3<@fg',
 		fgTransparent: ':alpha<0.5<@fg',
diff --git a/packages/frontend-shared/themes/l-u0.json5 b/packages/frontend-shared/themes/l-u0.json5
index f6023af819..687b389217 100644
--- a/packages/frontend-shared/themes/l-u0.json5
+++ b/packages/frontend-shared/themes/l-u0.json5
@@ -49,10 +49,7 @@
 		dateLabelFg: '@fg',
 		inputBorder: 'rgba(255, 255, 255, 0.1)',
 		panelBorder: '" solid 1px var(--MI_THEME-divider)',
-		accentDarken: ':darken<10<@accent',
-		acrylicPanel: ':alpha<0.5<@panel',
 		navIndicator: '@indicator',
-		accentLighten: ':lighten<10<@accent',
 		buttonHoverBg: '#0000001a',
 		driveFolderBg: ':alpha<0.3<@accent',
 		fgHighlighted: ':lighten<3<@fg',
diff --git a/packages/frontend-shared/themes/l-vivid.json5 b/packages/frontend-shared/themes/l-vivid.json5
index 058c9c32e5..f5589a5499 100644
--- a/packages/frontend-shared/themes/l-vivid.json5
+++ b/packages/frontend-shared/themes/l-vivid.json5
@@ -40,10 +40,7 @@
 		inputBorder: 'rgba(0, 0, 0, 0.1)',
 		inputBorderHover: 'rgba(0, 0, 0, 0.2)',
 		panelBorder: '" solid 1px var(--MI_THEME-divider)',
-		accentDarken: ':darken<10<@accent',
-		acrylicPanel: ':alpha<0.5<@panel',
 		navIndicator: '@accent',
-		accentLighten: ':lighten<10<@accent',
 		driveFolderBg: ':alpha<0.3<@accent',
 		fgHighlighted: ':darken<3<@fg',
 		fgTransparent: ':alpha<0.5<@fg',
diff --git a/packages/frontend/src/components/MkAutocomplete.vue b/packages/frontend/src/components/MkAutocomplete.vue
index 03cf107231..e51a56fa7b 100644
--- a/packages/frontend/src/components/MkAutocomplete.vue
+++ b/packages/frontend/src/components/MkAutocomplete.vue
@@ -420,7 +420,7 @@ onBeforeUnmount(() => {
 	}
 
 	&:active {
-		background: var(--MI_THEME-accentDarken);
+		background: hsl(from var(--MI_THEME-accent) h s calc(l - 10));
 		color: #fff !important;
 	}
 }
diff --git a/packages/frontend/src/components/MkChannelFollowButton.vue b/packages/frontend/src/components/MkChannelFollowButton.vue
index 2ef2d84198..1aec8d0c07 100644
--- a/packages/frontend/src/components/MkChannelFollowButton.vue
+++ b/packages/frontend/src/components/MkChannelFollowButton.vue
@@ -103,13 +103,13 @@ async function onClick() {
 		background: var(--MI_THEME-accent);
 
 		&:hover {
-			background: var(--MI_THEME-accentLighten);
-			border-color: var(--MI_THEME-accentLighten);
+			background: hsl(from var(--MI_THEME-accent) h s calc(l + 10));
+			border-color: hsl(from var(--MI_THEME-accent) h s calc(l + 10));
 		}
 
 		&:active {
-			background: var(--MI_THEME-accentDarken);
-			border-color: var(--MI_THEME-accentDarken);
+			background: hsl(from var(--MI_THEME-accent) h s calc(l - 10));
+			border-color: hsl(from var(--MI_THEME-accent) h s calc(l - 10));
 		}
 	}
 
diff --git a/packages/frontend/src/components/MkDrive.file.vue b/packages/frontend/src/components/MkDrive.file.vue
index c54d9eb4d5..70ab60cfae 100644
--- a/packages/frontend/src/components/MkDrive.file.vue
+++ b/packages/frontend/src/components/MkDrive.file.vue
@@ -151,11 +151,11 @@ function onDragend() {
 		background: var(--MI_THEME-accent);
 
 		&:hover {
-			background: var(--MI_THEME-accentLighten);
+			background: hsl(from var(--MI_THEME-accent) h s calc(l + 10));
 		}
 
 		&:active {
-			background: var(--MI_THEME-accentDarken);
+			background: hsl(from var(--MI_THEME-accent) h s calc(l - 10));
 		}
 
 		> .label {
diff --git a/packages/frontend/src/components/MkFollowButton.vue b/packages/frontend/src/components/MkFollowButton.vue
index b62494fa20..b65f610986 100644
--- a/packages/frontend/src/components/MkFollowButton.vue
+++ b/packages/frontend/src/components/MkFollowButton.vue
@@ -211,13 +211,13 @@ onBeforeUnmount(() => {
 		background: var(--MI_THEME-accent);
 
 		&:hover {
-			background: var(--MI_THEME-accentLighten);
-			border-color: var(--MI_THEME-accentLighten);
+			background: hsl(from var(--MI_THEME-accent) h s calc(l + 10));
+			border-color: hsl(from var(--MI_THEME-accent) h s calc(l + 10));
 		}
 
 		&:active {
-			background: var(--MI_THEME-accentDarken);
-			border-color: var(--MI_THEME-accentDarken);
+			background: hsl(from var(--MI_THEME-accent) h s calc(l - 10));
+			border-color: hsl(from var(--MI_THEME-accent) h s calc(l - 10));
 		}
 	}
 
diff --git a/packages/frontend/src/components/MkMediaImage.vue b/packages/frontend/src/components/MkMediaImage.vue
index 8e0030c08d..bb42cbecf9 100644
--- a/packages/frontend/src/components/MkMediaImage.vue
+++ b/packages/frontend/src/components/MkMediaImage.vue
@@ -220,7 +220,7 @@ function showMenu(ev: MouseEvent) {
 	position: absolute;
 	border-radius: 6px;
 	background-color: var(--MI_THEME-fg);
-	color: var(--MI_THEME-accentLighten);
+	color: hsl(from var(--MI_THEME-accent) h s calc(l + 10));
 	font-size: 12px;
 	opacity: .5;
 	padding: 5px 8px;
@@ -294,7 +294,7 @@ html[data-color-scheme=light] .visible {
 	/* Hardcode to black because either --MI_THEME-bg or --MI_THEME-fg makes it hard to read in dark/light mode */
 	background-color: black;
 	border-radius: 6px;
-	color: var(--MI_THEME-accentLighten);
+	color: hsl(from var(--MI_THEME-accent) h s calc(l + 10));
 	display: inline-block;
 	font-weight: bold;
 	font-size: 0.8em;
diff --git a/packages/frontend/src/components/MkMediaVideo.vue b/packages/frontend/src/components/MkMediaVideo.vue
index 1cd88fb1ab..0e5f1e28b9 100644
--- a/packages/frontend/src/components/MkMediaVideo.vue
+++ b/packages/frontend/src/components/MkMediaVideo.vue
@@ -553,7 +553,7 @@ onDeactivated(() => {
 	/* Hardcode to black because either --MI_THEME-bg or --MI_THEME-fg makes it hard to read in dark/light mode */
 	background-color: black;
 	border-radius: 6px;
-	color: var(--MI_THEME-accentLighten);
+	color: hsl(from var(--MI_THEME-accent) h s calc(l + 10));
 	display: inline-block;
 	font-weight: bold;
 	font-size: 0.8em;
@@ -565,7 +565,7 @@ onDeactivated(() => {
 	position: absolute;
 	border-radius: 6px;
 	background-color: var(--MI_THEME-fg);
-	color: var(--MI_THEME-accentLighten);
+	color: hsl(from var(--MI_THEME-accent) h s calc(l + 10));
 	font-size: 12px;
 	opacity: .5;
 	padding: 5px 8px;
diff --git a/packages/frontend/src/components/MkRange.vue b/packages/frontend/src/components/MkRange.vue
index c0e3e5db4b..d99ac5cb24 100644
--- a/packages/frontend/src/components/MkRange.vue
+++ b/packages/frontend/src/components/MkRange.vue
@@ -287,7 +287,7 @@ function onMousedown(ev: MouseEvent | TouchEvent) {
 				border-radius: 999px;
 
 				&:hover {
-					background: var(--MI_THEME-accentLighten);
+					background: hsl(from var(--MI_THEME-accent) h s calc(l + 10));
 				}
 			}
 		}
diff --git a/packages/frontend/src/components/grid/MkDataCell.vue b/packages/frontend/src/components/grid/MkDataCell.vue
index 7c8a5d64d7..55de0df690 100644
--- a/packages/frontend/src/components/grid/MkDataCell.vue
+++ b/packages/frontend/src/components/grid/MkDataCell.vue
@@ -345,7 +345,7 @@ $cellHeight: 28px;
 	border: solid 0.5px transparent;
 
 	&.selected {
-		border: solid 0.5px var(--MI_THEME-accentLighten);
+		border: solid 0.5px hsl(from var(--MI_THEME-accent) h s calc(l + 10));
 	}
 
 	&.ranged {
diff --git a/packages/frontend/src/pages/welcome.entrance.a.vue b/packages/frontend/src/pages/welcome.entrance.a.vue
index 9888df02cf..d131c17340 100644
--- a/packages/frontend/src/pages/welcome.entrance.a.vue
+++ b/packages/frontend/src/pages/welcome.entrance.a.vue
@@ -151,7 +151,7 @@ misskeyApiGet('federation/instances', {
 	left: 0;
 	right: 0;
 	margin: auto;
-	background: var(--MI_THEME-acrylicPanel);
+	background: color(from var(--MI_THEME-panel) srgb r g b / 0.5);
 	-webkit-backdrop-filter: var(--MI-blur, blur(15px));
 	backdrop-filter: var(--MI-blur, blur(15px));
 	border-radius: 999px;
diff --git a/packages/frontend/src/style.scss b/packages/frontend/src/style.scss
index de3c2621fd..f3979fab1d 100644
--- a/packages/frontend/src/style.scss
+++ b/packages/frontend/src/style.scss
@@ -398,7 +398,7 @@ rt {
 }
 
 ._acrylic {
-	background: var(--MI_THEME-acrylicPanel);
+	background: color(from var(--MI_THEME-panel) srgb r g b / 0.5);
 	-webkit-backdrop-filter: var(--MI-blur, blur(15px));
 	backdrop-filter: var(--MI-blur, blur(15px));
 }
diff --git a/packages/frontend/src/ui/_common_/navbar-for-mobile.vue b/packages/frontend/src/ui/_common_/navbar-for-mobile.vue
index 2fbc9ab4b3..6acfde5b89 100644
--- a/packages/frontend/src/ui/_common_/navbar-for-mobile.vue
+++ b/packages/frontend/src/ui/_common_/navbar-for-mobile.vue
@@ -159,7 +159,7 @@ function more() {
 
 	&:hover, &.active {
 		&::before {
-			background: var(--MI_THEME-accentLighten);
+			background: hsl(from var(--MI_THEME-accent) h s calc(l + 10));
 		}
 	}
 }
diff --git a/packages/frontend/src/ui/_common_/navbar.vue b/packages/frontend/src/ui/_common_/navbar.vue
index 8bd33c7052..fbb604ba8e 100644
--- a/packages/frontend/src/ui/_common_/navbar.vue
+++ b/packages/frontend/src/ui/_common_/navbar.vue
@@ -382,7 +382,7 @@ function menuEdit() {
 
 		&:hover, &.active {
 			&::before {
-				background: var(--MI_THEME-accentLighten);
+				background: hsl(from var(--MI_THEME-accent) h s calc(l + 10));
 			}
 		}
 	}
@@ -612,7 +612,7 @@ function menuEdit() {
 
 		&:hover, &.active {
 			&::before {
-				background: var(--MI_THEME-accentLighten);
+				background: hsl(from var(--MI_THEME-accent) h s calc(l + 10));
 			}
 		}
 	}
diff --git a/packages/frontend/src/ui/deck.vue b/packages/frontend/src/ui/deck.vue
index b45a79fd3a..05c815f28f 100644
--- a/packages/frontend/src/ui/deck.vue
+++ b/packages/frontend/src/ui/deck.vue
@@ -49,7 +49,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 					<button v-tooltip.noDelay.left="i18n.ts._deck.addColumn" :class="$style.sideMenuButton" class="_button" @click="addColumn"><i class="ti ti-plus"></i></button>
 				</div>
 				<div :class="$style.sideMenuBottom">
-					<button v-tooltip.noDelay.left="i18n.ts.settings" :class="$style.sideMenuButton" class="_button" @click="showSettings"><i class="ti ti-settings"></i></button>
+					<button v-tooltip.noDelay.left="i18n.ts.settings" :class="$style.sideMenuButton" class="_button" @click="showSettings"><i class="ti ti-settings-2"></i></button>
 				</div>
 			</div>
 		</div>
@@ -63,7 +63,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 				<button v-tooltip.noDelay.left="i18n.ts._deck.addColumn" :class="$style.bottomMenuButton" class="_button" @click="addColumn"><i class="ti ti-plus"></i></button>
 			</div>
 			<div :class="$style.bottomMenuRight">
-				<button v-tooltip.noDelay.left="i18n.ts.settings" :class="$style.bottomMenuButton" class="_button" @click="showSettings"><i class="ti ti-settings"></i></button>
+				<button v-tooltip.noDelay.left="i18n.ts.settings" :class="$style.bottomMenuButton" class="_button" @click="showSettings"><i class="ti ti-settings-2"></i></button>
 			</div>
 		</div>