diff --git a/duomo.scss b/index.scss
similarity index 100%
rename from duomo.scss
rename to index.scss
diff --git a/package.json b/package.json
index 8ee15ba..bb66252 100644
--- a/package.json
+++ b/package.json
@@ -1,12 +1,12 @@
 {
 	"name": "@zaydek/duomo",
 	"version": "0.7.6",
-	"main": "dist/prod.css",
+	"main": "dist/prod-full.css",
 	"license": "MIT",
 	"files": [
 		"dist/",
 		"src/sass/**/*.{css,scss}",
-		"duomo.scss"
+		"index.scss"
 	],
 	"scripts": {
 		"watch": "nodemon --exec 'sass --style=compressed src/consumer.scss dist/dev.css && yarn prettier --write dist/dev.css' --ext css,scss --watch src",
@@ -15,9 +15,8 @@
 		"build-css-dev-full": "sass --style=compressed scripts/dev-full.scss dist/dev-full.css && yarn prettier --write dist/dev-full.css",
 		"build-css-prod": "sass --style=compressed scripts/prod.scss dist/prod.css",
 		"build-css-prod-full": "sass --style=compressed scripts/prod-full.scss dist/prod-full.css",
-		"build-js": "tsc",
-		"build-browser-js": "node scripts/browser.js",
-		"build": "rm -rf dist && yarn concurrently --raw 'yarn build-css-dev' 'yarn build-css-dev-full' 'yarn build-css-prod' 'yarn build-css-prod-full' 'yarn build-js' 'yarn build-browser-js'",
+		"build-js": "tsc && node scripts/browser.js",
+		"build": "rm -rf dist && yarn concurrently --raw 'yarn build-css-dev' 'yarn build-css-dev-full' 'yarn build-css-prod' 'yarn build-css-prod-full' 'yarn build-js'",
 		"publish-dist-dry-run": "yarn build && npm publish --dry-run"
 	},
 	"devDependencies": {
diff --git a/src/runtime/runtime.ts b/src/runtime/runtime.ts
index 653eb02..fc5fc8f 100644
--- a/src/runtime/runtime.ts
+++ b/src/runtime/runtime.ts
@@ -1,18 +1,33 @@
-const THEME_PREFERENCE_KEY = "duomo-theme-preference" as const
+/*
+ * TypeScript
+ */
 
-type DevMode = "development" | "production"
+type DEV_MODE = "development" | "production"
+
+declare global {
+	interface Window {
+		Duomo: IRuntime
+	}
+}
+
+/*
+ * Runtime
+ */
+
+const themePreferenceKey = "duomo-theme-preference" as const
 
 interface IRuntime {
-	init(mode: DevMode): () => void
+	init(mode: DEV_MODE): () => void
 	toggleDebugMode(): void
+	toggleDebugSpaceMode(): void
 	toggleDarkMode(): void
 }
 
 // prettier-ignore
-function localStoragePrefersDarkMode() {
+function LSPrefersDarkMode() {
 	const ok = (
-		THEME_PREFERENCE_KEY in window.localStorage &&
-		window.localStorage[THEME_PREFERENCE_KEY] === "dark"
+		themePreferenceKey in window.localStorage &&
+		window.localStorage[themePreferenceKey] === "dark"
 	)
 	return ok
 }
@@ -27,15 +42,16 @@ function OSPrefersDarkMode() {
 }
 
 const Duomo: IRuntime = {
-	init(mode: DevMode = "production") {
-		const deferers: Array<() => void> = []
+	init(mode: DEV_MODE = "production") {
+		const html = document.documentElement
+		const deferers: (() => void)[] = []
 
 		console.log("[Duomo] init=true")
 
 		// NOTE: localStorage takes precedence.
 		// TODO: Change to `[data-theme="dark"]`?
-		if (localStoragePrefersDarkMode() || !OSPrefersDarkMode()) {
-			document.body.classList.add("dark")
+		if (LSPrefersDarkMode() || !OSPrefersDarkMode()) {
+			html.setAttribute("data-theme", "dark")
 		}
 
 		if ("matchMedia" in window) {
@@ -49,21 +65,32 @@ const Duomo: IRuntime = {
 		}
 
 		if (mode !== "production") {
-			const handleKeyDownDarkMode = (e: KeyboardEvent) => {
-				if (e.ctrlKey && (e.key.toLowerCase() === "d" || e.keyCode === 68)) {
-					Duomo.toggleDarkMode()
-				}
-			}
-			document.addEventListener("keydown", handleKeyDownDarkMode)
-			deferers.push(() => document.removeEventListener("keydown", handleKeyDownDarkMode))
-
+			// Key: `d`.
 			const handleKeyDownDebugMode = (e: KeyboardEvent) => {
-				if (!e.ctrlKey && (e.key.toLowerCase() === "d" || e.keyCode === 68)) {
+				if (!e.ctrlKey && !e.altKey && (e.key.toLowerCase() === "d" || e.keyCode === 68)) {
 					Duomo.toggleDebugMode()
 				}
 			}
 			document.addEventListener("keydown", handleKeyDownDebugMode)
 			deferers.push(() => document.removeEventListener("keydown", handleKeyDownDebugMode))
+
+			// Key: `alt-d`.
+			const handleKeyDownDebugSpaceMode = (e: KeyboardEvent) => {
+				if (!e.ctrlKey && e.altKey && (e.key.toLowerCase() === "d" || e.keyCode === 68)) {
+					Duomo.toggleDebugSpaceMode()
+				}
+			}
+			document.addEventListener("keydown", handleKeyDownDebugSpaceMode)
+			deferers.push(() => document.removeEventListener("keydown", handleKeyDownDebugSpaceMode))
+
+			// Key: `ctrl-d`.
+			const handleKeyDownDarkMode = (e: KeyboardEvent) => {
+				if (e.ctrlKey && !e.altKey && (e.key.toLowerCase() === "d" || e.keyCode === 68)) {
+					Duomo.toggleDarkMode()
+				}
+			}
+			document.addEventListener("keydown", handleKeyDownDarkMode)
+			deferers.push(() => document.removeEventListener("keydown", handleKeyDownDarkMode))
 		}
 
 		return () => {
@@ -72,43 +99,53 @@ const Duomo: IRuntime = {
 		}
 	},
 	toggleDebugMode() {
-		const hasAttribute = document.body.hasAttribute("data-debug")
+		const html = document.documentElement
+
+		const hasAttribute = html.hasAttribute("data-debug")
 		if (!hasAttribute) {
 			console.log("[Duomo] debugMode=on")
-			document.body.setAttribute("data-debug", "true")
+			html.setAttribute("data-debug", "true")
 		} else {
 			console.log("[Duomo] debugMode=off")
-			document.body.removeAttribute("data-debug")
+			html.removeAttribute("data-debug")
+		}
+	},
+	toggleDebugSpaceMode() {
+		const html = document.documentElement
+
+		const hasAttribute = html.hasAttribute("data-debug-space")
+		if (!hasAttribute) {
+			console.log("[Duomo] debugSpaceMode=on")
+			html.setAttribute("data-debug-space", "true")
+		} else {
+			console.log("[Duomo] debugSpaceMode=off")
+			html.removeAttribute("data-debug-space")
 		}
 	},
 	// TODO: `toggleDarkMode` is not currently cancelable. Should it be?
 	// TODO: Implement `toggleMode(mode: string = "dark")`.
 	toggleDarkMode() {
-		document.body.setAttribute("data-theme-effect", "true")
+		const html = document.documentElement
+
+		html.setAttribute("data-theme-effect", "true")
 		setTimeout(() => {
-			const hasAttribute = document.body.hasAttribute("data-theme")
+			const hasAttribute = html.hasAttribute("data-theme")
 			if (!hasAttribute) {
 				console.log("[Duomo] darkMode=on")
-				document.body.setAttribute("data-theme", "dark")
-				window.localStorage.setItem(THEME_PREFERENCE_KEY, "dark")
+				html.setAttribute("data-theme", "dark")
+				window.localStorage.setItem(themePreferenceKey, "dark")
 			} else {
 				console.log("[Duomo] darkMode=off")
-				document.body.removeAttribute("data-theme")
-				window.localStorage.setItem(THEME_PREFERENCE_KEY, "light")
+				html.removeAttribute("data-theme")
+				window.localStorage.setItem(themePreferenceKey, "light")
 			}
 			setTimeout(() => {
-				document.body.removeAttribute("data-theme-effect")
+				html.removeAttribute("data-theme-effect")
 			}, 300)
 		}, 25)
 	},
 }
 
-declare global {
-	interface Window {
-		Duomo: IRuntime
-	}
-}
-
 ;(() => {
 	if (typeof window !== "undefined") {
 		window.Duomo = Duomo
diff --git a/src/sass/extensions/stacks.scss b/src/sass/extensions/stacks.scss
index a0d86b4..a682cdd 100644
--- a/src/sass/extensions/stacks.scss
+++ b/src/sass/extensions/stacks.scss
@@ -172,17 +172,13 @@ $-align-opts: (
 		 */
 
 		#{variant(w-auto, $v)} {
+			--dm-align-self: stretch;
 			width: auto;
 		}
-		@each $rv in range() {
-			#{variant(w-#{$rv}, $v)} {
-				--dm-align-self: center;
-				width: rem($rv);
-			}
-		}
-		@each $rv in (100%, 100vw) {
+		@each $rv in to-array(range(), 100%, 100vw) {
 			#{variant(w-#{desc($rv)}, $v)} {
-				width: $rv;
+				--dm-align-self: center;
+				width: resolve($rv, rem);
 			}
 		}
 
@@ -193,19 +189,26 @@ $-align-opts: (
 		 */
 
 		#{variant(h-auto, $v)} {
+			--dm-align-self: stretch;
 			height: auto;
 		}
-		@each $rv in range() {
-			#{variant(h-#{$rv}, $v)} {
-				--dm-align-self: center;
-				height: rem($rv);
-			}
-		}
-		@each $rv in (100%, 100vh) {
+		@each $rv in to-array(range(), 100%, 100vh) {
 			#{variant(h-#{desc($rv)}, $v)} {
-				height: $rv;
+				--dm-align-self: center;
+				height: resolve($rv, rem);
 			}
 		}
+		// @each $rv in range() {
+		// 	#{variant(h-#{$rv}, $v)} {
+		// 		--dm-align-self: center;
+		// 		height: rem($rv);
+		// 	}
+		// }
+		// @each $rv in (100%, 100vh) {
+		// 	#{variant(h-#{desc($rv)}, $v)} {
+		// 		height: $rv;
+		// 	}
+		// }
 
 		/*
 		 * <... align-self-*>
diff --git a/src/sass/headers/data-stagger.scss b/src/sass/headers/data-stagger.scss
index 66d8862..11d3319 100644
--- a/src/sass/headers/data-stagger.scss
+++ b/src/sass/headers/data-stagger.scss
@@ -1,17 +1,17 @@
 @mixin data-stagger {
-	[data-stagger-1] {
+	[data-stagger="1"] {
 		width: var(--stagger-1-width);
 	}
-	[data-stagger-2] {
+	[data-stagger="2"] {
 		width: var(--stagger-2-width);
 	}
-	[data-stagger-3] {
+	[data-stagger="3"] {
 		width: var(--stagger-3-width);
 	}
-	[data-stagger-4] {
+	[data-stagger="4"] {
 		width: var(--stagger-4-width);
 	}
-	[data-stagger-last] {
+	[data-stagger="last"] {
 		width: var(--stagger-last-width);
 	}
 }
diff --git a/src/sass/headers/introspection.scss b/src/sass/headers/introspection.scss
index dff4b60..ee58b87 100644
--- a/src/sass/headers/introspection.scss
+++ b/src/sass/headers/introspection.scss
@@ -19,25 +19,25 @@
 		--ui-mono: #{font(mono, $raw: true)};
 
 		// CSS reset vars.
-		--placeholder-color-default: #{color(gray-400)};
-		--border-color-default: #{color(gray-200)};
+		--placeholder-color-default: hsl(#{color(gray-400)});
+		--border-color-default: hsl(#{color(gray-300)});
 		--transition-duration-default: 300ms;
 		--transition-timing-function-default: #{timing(ease-out)};
 
-		// `data-stagger` presets.
+		// [data-stagger]
 		--stagger-1-width: #{math.percentage(4 / 8)};
 		--stagger-2-width: #{math.percentage(6 / 8)};
 		--stagger-3-width: #{math.percentage(7 / 8)};
 		--stagger-4-width: #{math.percentage(5 / 8)};
 		--stagger-last-width: 50%;
 
-		// `data-debug` presets.
-		--debug-outline: 2px solid hsla(210, 100%, 50%, 0.5);
+		// [data-debug]
+		--debug-outline: 2px solid hsla(210, 100%, 50%, 0.25);
 		--debug-empty-spacer-outline: 1px dashed hsla(210, 100%, 50%, 0.25);
 		--debug-outline-offset: -2px;
 		--debug-spacer-background-color: hsla(210, 100%, 50%, 0.25);
 
-		// `data-debug-space` presets.
+		// [data-debug-space]
 		--debug-space-background-color: hsla(210, 100%, 50%, 0.1);
 	}
 }
diff --git a/src/sass/helpers/getters.scss b/src/sass/helpers/getters.scss
index e77575a..a830d67 100644
--- a/src/sass/helpers/getters.scss
+++ b/src/sass/helpers/getters.scss
@@ -1,10 +1,11 @@
 @use "sass:map";
 @use "sass:meta";
 
-@use "../configuration";
 @use "escapers" as *;
 @use "resolvers" as *;
 
+@use "../configuration";
+
 // Ex:
 //
 // n(-1) -> "-"