diff --git a/Sources/phbar/AppDelegate.swift b/Sources/phbar/AppDelegate.swift
index 366d933..b92c14d 100644
--- a/Sources/phbar/AppDelegate.swift
+++ b/Sources/phbar/AppDelegate.swift
@@ -2,32 +2,42 @@ import AppKit
 
 @MainActor
 final class AppDelegate: NSObject, NSApplicationDelegate {
-	var barController: BarController!
-	var window: BarWindow!
+	var controllers: [BarController] = []
+	var windows: [BarWindow] = []
 	private var observers: [IPCObserver] = []
 
+	/// Create one bar controller per screen. Each screen resolves its own
+	/// window and block set from the config, so refresh state and layout stay
+	/// independent across monitors.
 	init(
 		config: PHConfig,
-		screen: NSScreen,
+		screens: [NSScreen],
 		theme: PHTheme,
-		blocks: [PHBlock],
 		debug: Bool
-	) {
+	) throws {
 		super.init()
 
-		self.barController = BarController(
-			config: config,
-			screen: screen,
-			theme: theme,
-			blocks: blocks,
-			debug: debug
-		)
+		for screen in screens {
+			let blocks = try PHBlock.load(config.blocks(for: screen))
+			controllers.append(
+				BarController(
+					config: config,
+					screen: screen,
+					theme: theme,
+					blocks: blocks,
+					debug: debug
+				)
+			)
+		}
 	}
 
 	func applicationDidFinishLaunching(_ notification: Notification) {
-		window = BarWindow(controller: barController)
-		window.orderFront(nil)
-		barController.startAutoRefresh()
+		for controller in controllers {
+			let window = BarWindow(controller: controller)
+			window.orderFront(nil)
+			windows.append(window)
+			controller.startAutoRefresh()
+		}
 
 		// Listen for refresh notifications from `phbar refresh`.
 		let token = IPC.observe(.refresh) { [weak self] _ in
@@ -39,11 +49,15 @@ final class AppDelegate: NSObject, NSApplicationDelegate {
 	}
 
 	func refresh() {
-		barController.refresh()
+		for controller in controllers {
+			controller.refresh()
+		}
 	}
 
 	func applicationWillTerminate(_ notification: Notification) {
-		barController.stopAutoRefresh()
+		for controller in controllers {
+			controller.stopAutoRefresh()
+		}
 		observers.removeAll()
 	}
 }
diff --git a/Sources/phbar/CLI/cli+start.swift b/Sources/phbar/CLI/cli+start.swift
index 7fe14c6..7b08c70 100644
--- a/Sources/phbar/CLI/cli+start.swift
+++ b/Sources/phbar/CLI/cli+start.swift
@@ -14,16 +14,23 @@ extension phbar {
 
 		mutating func run() throws {
 			let config = try PHConfig.load()
-			let screen = try targetScreen(monitor: 0)
 			let theme = try PHTheme.load("voltage")
 
 			// NOTE: Make sure NSApp.run() runs in the main thread
 			dispatchPrecondition(condition: .onQueue(.main))
 
 			try MainActor.assumeIsolated {
-				let blocks = try PHBlock.load()
+				// Spawn a bar on every screen; per-monitor window and block-set
+				// selection is driven by the config's `[monitor]` overrides.
+				let screens = NSScreen.screens
+				guard !screens.isEmpty else { throw CleanExit.message("No monitor found") }
 
-				let delegate = AppDelegate(config: config, screen: screen, theme: theme, blocks: blocks, debug: debug)
+				let delegate = try AppDelegate(
+					config: config,
+					screens: screens,
+					theme: theme,
+					debug: debug
+				)
 				let app = NSApplication.shared
 				app.setActivationPolicy(.accessory)
 				app.delegate = delegate
@@ -34,27 +41,3 @@ extension phbar {
 		}
 	}
 }
-
-// Monitor
-
-extension phbar.start {
-	private func targetScreen(monitor: Int) throws -> NSScreen {
-		let screens = NSScreen.screens
-		guard !screens.isEmpty else { throw CleanExit.message("No monitor founded") }
-
-		if monitor >= 0, monitor < screens.count {
-			return screens[monitor]
-		}
-
-		// Default: screen containing the mouse cursor
-		let mouseLocation = NSEvent.mouseLocation
-		guard
-			let screen = screens.first(where: { NSMouseInRect(mouseLocation, $0.frame, false) })
-				?? screens.first
-		else {
-			throw CleanExit.message("No monitor founded")
-		}
-
-		return screen
-	}
-}
diff --git a/Sources/phbar/Models/Block/Extensions/PHBlock+Loading.swift b/Sources/phbar/Models/Block/Extensions/PHBlock+Loading.swift
index b54e128..a3c7e17 100644
--- a/Sources/phbar/Models/Block/Extensions/PHBlock+Loading.swift
+++ b/Sources/phbar/Models/Block/Extensions/PHBlock+Loading.swift
@@ -10,18 +10,26 @@ extension PHBlock {
 		}
 	}
 
-	nonisolated static var configFile: URL {
-		FileManager.default.homeDirectoryForCurrentUser.appending(path: ".config/phbar/blocks.toml")
+	nonisolated static var configDirectory: URL {
+		FileManager.default.homeDirectoryForCurrentUser.appending(path: ".config/phbar")
 	}
 
-	/// Load blocks from the default path (~/.config/phbar/blocks.toml).
-	/// If the file doesn't exist or fails to parse, defaults are used (non-fatal).
-	static func load() throws -> [PHBlock] {
-		if FileManager.default.fileExists(atPath: Self.configFile.relativePath) {
-			return try load(from: Self.configFile)
-		} else {
-			throw phbar.Error("Failed to load blocks file")
+	nonisolated static var blocksDirectory: URL {
+		Self.configDirectory.appending(path: "blocks")
+	}
+
+	/// Load a named block set from `<configDirectory>/blocks/<name>.toml`.
+	///
+	/// - Parameter configDirectory: Override the lookup root (used by tests);
+	///   defaults to `~/.config/phbar`.
+	static func load(_ blocks: String, in configDirectory: URL? = nil) throws -> [PHBlock] {
+		let base = configDirectory ?? Self.configDirectory
+
+		let setFile = base.appending(path: "blocks").appending(path: "\(blocks).toml")
+		guard FileManager.default.fileExists(atPath: setFile.relativePath) else {
+			throw phbar.Error("Failed to load blocks '\(blocks)'")
 		}
+		return try load(from: setFile)
 	}
 
 	/// Load theme from a file at URL.
diff --git a/Sources/phbar/Models/Block/Extensions/PHBlock+Refresh.swift b/Sources/phbar/Models/Block/Extensions/PHBlock+Refresh.swift
index db1b746..4e249dc 100644
--- a/Sources/phbar/Models/Block/Extensions/PHBlock+Refresh.swift
+++ b/Sources/phbar/Models/Block/Extensions/PHBlock+Refresh.swift
@@ -85,7 +85,10 @@ extension PHBlock {
 
 		let lines: [Substring]? = await Task.detached(priority: .userInitiated) {
 			let process = Process()
-			process.currentDirectoryURL = Self.configFile.deletingLastPathComponent()
+			// Commands run with the config root (~/.config/phbar) as their working
+			// directory, regardless of which block set they belong to, so relative
+			// paths in user scripts stay stable.
+			process.currentDirectoryURL = Self.configDirectory
 			process.executableURL = URL(fileURLWithPath: "/bin/bash")
 			process.arguments = ["-c", command]
 
diff --git a/Sources/phbar/Models/Config/Extensions/PHConfig+Screen.swift b/Sources/phbar/Models/Config/Extensions/PHConfig+Screen.swift
new file mode 100644
index 0000000..0b516ed
--- /dev/null
+++ b/Sources/phbar/Models/Config/Extensions/PHConfig+Screen.swift
@@ -0,0 +1,22 @@
+import AppKit
+
+extension PHConfig {
+	/// The per-monitor override that applies to `screen`, if any.
+	/// Precedence: monitor name → monitor index.
+	func monitorOverride(for screen: NSScreen) -> PHMonitorOverride? {
+		let index = NSScreen.screens.firstIndex(of: screen)
+		return monitorOverride(screenName: screen.localizedName, screenIndex: index)
+	}
+
+	/// Window definition name for `screen`: the override's `window` if set,
+	/// otherwise the global `window`.
+	func windowName(for screen: NSScreen) -> String {
+		monitorOverride(for: screen)?.window ?? window
+	}
+
+	/// Block-set name for `screen`: the override's `blocks` if set, otherwise
+	/// the global `blocks` (defaulting to `"default"`).
+	func blocks(for screen: NSScreen) -> String {
+		monitorOverride(for: screen)?.blocks ?? (blocks ?? "default")
+	}
+}
diff --git a/Sources/phbar/Models/Config/PHConfig.swift b/Sources/phbar/Models/Config/PHConfig.swift
index 4a6d7ab..7a79f6d 100644
--- a/Sources/phbar/Models/Config/PHConfig.swift
+++ b/Sources/phbar/Models/Config/PHConfig.swift
@@ -1,4 +1,43 @@
 struct PHConfig: Decodable {
 	let window: String
+	let blocks: String?
 	let env: [String: String]?
+	let monitors: [String: PHMonitorOverride]?
+
+	private enum CodingKeys: String, CodingKey {
+		case window, blocks, env
+		case monitors = "monitor"
+	}
+}
+
+/// A per-monitor entry from the config's `[monitor]` table.
+///
+/// Either field is optional; an unset field inherits the matching global
+/// (`window` or `blocks`) so a monitor can override just one of the two.
+struct PHMonitorOverride: Decodable {
+	let window: String?
+	let blocks: String?
+}
+
+extension PHConfig {
+	/// The override matching a screen identifier, if any.
+	/// Pure (no AppKit). Precedence: monitor name → monitor index.
+	func monitorOverride(screenName: String, screenIndex: Int?) -> PHMonitorOverride? {
+		guard let monitors else { return nil }
+		if let byName = monitors[screenName] { return byName }
+		if let index = screenIndex, let byIndex = monitors[String(index)] { return byIndex }
+		return nil
+	}
+
+	/// Window definition name for a screen (pure resolver).
+	/// Override's `window` if set, else the global `window`.
+	func windowName(screenName: String, screenIndex: Int?) -> String {
+		monitorOverride(screenName: screenName, screenIndex: screenIndex)?.window ?? window
+	}
+
+	/// Block-set name for a screen (pure resolver).
+	/// Override's `blocks` if set, else the global `blocks` (default `"default"`).
+	func blocksName(screenName: String, screenIndex: Int?) -> String {
+		monitorOverride(screenName: screenName, screenIndex: screenIndex)?.blocks ?? (blocks ?? "default")
+	}
 }
diff --git a/Sources/phbar/Models/Config/config.toml b/Sources/phbar/Models/Config/config.toml
index 1cdc149..2e99ede 100644
--- a/Sources/phbar/Models/Config/config.toml
+++ b/Sources/phbar/Models/Config/config.toml
@@ -1,2 +1,19 @@
-window = "top"
-height = 30
+# Default window and block set for every monitor.
+#   - window: a [[window]] definition from the theme file
+#   - blocks: a named set at ~/.config/phbar/blocks/<name>.toml
+window = "default"
+blocks = "default"
+
+# Optional: override the window and/or block set per monitor.
+#   - quoted numeric key → NSScreen index
+#   - string key         → NSScreen.localizedName (stable across replugs)
+# Precedence: monitor name → monitor index → the globals above.
+# Either field may be omitted to inherit its global value.
+#
+# [monitor."1"]
+# window = "bottom"
+# blocks = "laptop"
+#
+# [monitor."DELL U2723QE"]
+# window = "clock"
+# blocks = "external"
diff --git a/Sources/phbar/Models/Theme/PHThemeAnchor.swift b/Sources/phbar/Models/Theme/PHThemeAnchor.swift
new file mode 100644
index 0000000..5b51c2e
--- /dev/null
+++ b/Sources/phbar/Models/Theme/PHThemeAnchor.swift
@@ -0,0 +1,64 @@
+import CoreGraphics
+import Foundation
+
+/// Where a window is placed within its screen.
+///
+/// Single-edge anchors (`top`, `bottom`, `leading`, `trailing`) pin to that
+/// edge and center along the opposite axis. Corner anchors pin to two edges.
+/// `center` centers the window on both axes.
+enum PHThemeAnchor: String, Decodable {
+	case top, bottom, leading, trailing
+	case topLeading = "top-leading"
+	case topTrailing = "top-trailing"
+	case bottomLeading = "bottom-leading"
+	case bottomTrailing = "bottom-trailing"
+	case center
+}
+
+extension PHThemeAnchor {
+	/// Compute the top-left origin (in screen coordinates) of a window of `size`
+	/// placed against this anchor within `screen`, offset by `margin` along the
+	/// anchored edges.
+	///
+	/// Edges the anchor does not reference are ignored, so margins only affect
+	/// the relevant sides.
+	func origin(in screen: CGRect, size: CGSize, margin: PHThemeMargin) -> CGPoint {
+		let top = margin.top ?? 0
+		let bottom = margin.bottom ?? 0
+		let leading = margin.leading ?? 0
+		let trailing = margin.trailing ?? 0
+
+		// Default: centered on both axes.
+		var point = CGPoint(
+			x: screen.midX - size.width / 2,
+			y: screen.midY - size.height / 2
+		)
+
+		switch self {
+		case .top:
+			point.y = screen.maxY - CGFloat(top) - size.height
+		case .bottom:
+			point.y = screen.minY + CGFloat(bottom)
+		case .leading:
+			point.x = screen.minX + CGFloat(leading)
+		case .trailing:
+			point.x = screen.maxX - CGFloat(trailing) - size.width
+		case .topLeading:
+			point.x = screen.minX + CGFloat(leading)
+			point.y = screen.maxY - CGFloat(top) - size.height
+		case .topTrailing:
+			point.x = screen.maxX - CGFloat(trailing) - size.width
+			point.y = screen.maxY - CGFloat(top) - size.height
+		case .bottomLeading:
+			point.x = screen.minX + CGFloat(leading)
+			point.y = screen.minY + CGFloat(bottom)
+		case .bottomTrailing:
+			point.x = screen.maxX - CGFloat(trailing) - size.width
+			point.y = screen.minY + CGFloat(bottom)
+		case .center:
+			break
+		}
+
+		return point
+	}
+}
diff --git a/Sources/phbar/Models/Theme/PHThemeDimension.swift b/Sources/phbar/Models/Theme/PHThemeDimension.swift
new file mode 100644
index 0000000..67babe1
--- /dev/null
+++ b/Sources/phbar/Models/Theme/PHThemeDimension.swift
@@ -0,0 +1,48 @@
+import CoreGraphics
+import Foundation
+
+/// A length expressed either in points or as a percentage of the available
+/// space (e.g. the screen width).
+///
+/// Decoded from either a number (`width = 400`) or a percentage string
+/// (`width = "100%"`).
+enum PHThemeDimension: Decodable, Equatable {
+	case points(Double)
+	case percentage(Double)
+
+	init(from decoder: Decoder) throws {
+		let container = try decoder.singleValueContainer()
+
+		// TOML encodes integers and floats distinctly, so accept both.
+		if let double = try? container.decode(Double.self) {
+			self = .points(double)
+			return
+		}
+		if let int = try? container.decode(Int.self) {
+			self = .points(Double(int))
+			return
+		}
+		if let string = try? container.decode(String.self) {
+			let trimmed = string.trimmingCharacters(in: .whitespaces)
+			if trimmed.hasSuffix("%"), let value = Double(trimmed.dropLast()) {
+				self = .percentage(value / 100.0)
+				return
+			}
+		}
+
+		throw DecodingError.dataCorruptedError(
+			in: container,
+			debugDescription: #"Expected a number or a percentage string like "100%""#
+		)
+	}
+
+	/// Resolve the dimension against a total length.
+	func resolve(against length: CGFloat) -> CGFloat {
+		switch self {
+		case .points(let value):
+			return CGFloat(value)
+		case .percentage(let ratio):
+			return length * CGFloat(ratio)
+		}
+	}
+}
diff --git a/Sources/phbar/Models/Theme/PHThemeMargin.swift b/Sources/phbar/Models/Theme/PHThemeMargin.swift
new file mode 100644
index 0000000..58471b5
--- /dev/null
+++ b/Sources/phbar/Models/Theme/PHThemeMargin.swift
@@ -0,0 +1,24 @@
+import Foundation
+
+/// Insets (in points) from the screen edges implied by a window's anchor.
+///
+/// Only the edges referenced by the anchor are consumed; the rest are ignored,
+/// so a margin only affects the relevant sides of the placement.
+struct PHThemeMargin: Decodable, Equatable {
+	let top: Double?
+	let bottom: Double?
+	let leading: Double?
+	let trailing: Double?
+
+	init(
+		top: Double? = nil,
+		bottom: Double? = nil,
+		leading: Double? = nil,
+		trailing: Double? = nil
+	) {
+		self.top = top
+		self.bottom = bottom
+		self.leading = leading
+		self.trailing = trailing
+	}
+}
diff --git a/Sources/phbar/Models/Theme/PHThemePoint.swift b/Sources/phbar/Models/Theme/PHThemePoint.swift
new file mode 100644
index 0000000..1228896
--- /dev/null
+++ b/Sources/phbar/Models/Theme/PHThemePoint.swift
@@ -0,0 +1,10 @@
+import Foundation
+
+/// An absolute screen-space origin.
+///
+/// When set on a window, it overrides anchor/margin placement entirely — the
+/// window appears at exactly these coordinates.
+struct PHThemePoint: Decodable, Equatable {
+	let x: Double
+	let y: Double
+}
diff --git a/Sources/phbar/Models/Theme/PHThemeWindow.swift b/Sources/phbar/Models/Theme/PHThemeWindow.swift
index 6420e38..e9c80c2 100644
--- a/Sources/phbar/Models/Theme/PHThemeWindow.swift
+++ b/Sources/phbar/Models/Theme/PHThemeWindow.swift
@@ -1,12 +1,26 @@
+import Foundation
+
 struct PHThemeWindow: Decodable {
 	let name: String
 	var hasShadow: Bool? = false
 	var blur: Double? = 0
 
+	/// Window height in points.
+	var height: Double? = 30
+	/// Window width: a point value or a percentage of the screen width.
+	var width: PHThemeDimension? = .percentage(1.0)
+	/// Semantic placement within the screen.
+	var anchor: PHThemeAnchor? = .top
+	/// Insets from the anchored edges.
+	var margin: PHThemeMargin? = .init()
+	/// Absolute origin. Overrides `anchor` and `margin` when set.
+	var origin: PHThemePoint?
+
 	private enum CodingKeys: String, CodingKey {
 		case name
 		case hasShadow = "shadow"
 		case blur
+		case height, width, anchor, margin, origin
 	}
 
 	static let `default`: Self = {
diff --git a/Sources/phbar/Models/Theme/theme.toml b/Sources/phbar/Models/Theme/theme.toml
index 4dd975b..4def825 100644
--- a/Sources/phbar/Models/Theme/theme.toml
+++ b/Sources/phbar/Models/Theme/theme.toml
@@ -3,12 +3,18 @@
 # Place at ~/.config/phbar/themes/voltage.toml
 
 [[window]]
-name = "default"
+name   = "default"
+anchor = "top"
+height = 30
+width  = "100%"
 shadow = false
 blur   = 0.0
 
 [[window]]
-name = "bottom"
+name   = "bottom"
+anchor = "bottom"
+height = 30
+width  = "100%"
 shadow = false
 blur   = 0.0
 
diff --git a/Sources/phbar/Views/BarController.swift b/Sources/phbar/Views/BarController.swift
index 25b6ff5..56940d6 100644
--- a/Sources/phbar/Views/BarController.swift
+++ b/Sources/phbar/Views/BarController.swift
@@ -20,7 +20,7 @@ final class BarController: ObservableObject {
 		self.config = config
 		self.screen = screen
 		self.theme = theme
-		self.window = Self.window(for: config, from: theme)
+		self.window = Self.window(for: config, screen: screen, from: theme)
 		self.blocks = blocks
 
 		for block in blocks {
@@ -34,8 +34,17 @@ final class BarController: ObservableObject {
 // Theming
 
 extension BarController {
-	static func window(for config: PHConfig, from theme: PHTheme) -> PHThemeWindow {
-		guard let window = theme.windows?.first(where: { $0.name == config.window }) else {
+	/// Resolve the window definition for a given screen, applying any
+	/// per-monitor override from the config. Selection itself lives on
+	/// `PHConfig` (see `windowName(for:)`).
+	static func window(for config: PHConfig, screen: NSScreen, from theme: PHTheme) -> PHThemeWindow {
+		resolve(window: config.windowName(for: screen), from: theme)
+	}
+
+	/// Look up a window definition by name, falling back to "default" then the
+	/// built-in default.
+	static func resolve(window name: String, from theme: PHTheme) -> PHThemeWindow {
+		guard let window = theme.windows?.first(where: { $0.name == name }) else {
 			guard let defaultWindow = theme.windows?.first(where: { $0.name == "default" }) else {
 				return PHThemeWindow.default
 			}
diff --git a/Sources/phbar/Views/BarWindow.swift b/Sources/phbar/Views/BarWindow.swift
index b43a5c1..30b0269 100644
--- a/Sources/phbar/Views/BarWindow.swift
+++ b/Sources/phbar/Views/BarWindow.swift
@@ -46,13 +46,32 @@ final class BarWindow: NSPanel {
 }
 
 extension BarWindow {
-	/// Calculate window frame and position.
+	/// Calculate window frame and position from the theme window definition,
+	/// resolved against the controller's screen.
 	static func computeFrame(from controller: BarController) -> NSRect {
 		let screenFrame = controller.screen.frame
-		let height: CGFloat = 30
-		let x = screenFrame.minX
-		let y = screenFrame.maxY - height
+		let themeWindow = controller.window
 
-		return NSRect(x: x, y: y, width: screenFrame.width, height: height)
+		let size = CGSize(
+			width: (themeWindow.width ?? .percentage(1.0)).resolve(against: screenFrame.width),
+			height: CGFloat(themeWindow.height ?? 30)
+		)
+
+		// Absolute origin wins over anchor/margin.
+		if let origin = themeWindow.origin {
+			return NSRect(
+				x: CGFloat(origin.x),
+				y: CGFloat(origin.y),
+				width: size.width,
+				height: size.height
+			)
+		}
+
+		let anchor = themeWindow.anchor ?? .top
+		let margin = themeWindow.margin ?? .init()
+		return NSRect(
+			origin: anchor.origin(in: screenFrame, size: size, margin: margin),
+			size: size
+		)
 	}
 }
diff --git a/Tests/phbarTests/phbarTests.swift b/Tests/phbarTests/phbarTests.swift
index feb456a..3410898 100644
--- a/Tests/phbarTests/phbarTests.swift
+++ b/Tests/phbarTests/phbarTests.swift
@@ -110,7 +110,7 @@ private struct TestPayload: Codable, Equatable {
 	#expect(blocks[0].command == "echo hello")
 	#expect(blocks[0].name == "greeting")
 	#expect(blocks[0].refresh == 5.0)
-	#expect(blocks[0].label == "")
+	#expect(blocks[0].label == nil)
 	#expect(blocks[1].name == nil)
 	#expect(blocks[1].refresh == nil)
 }
@@ -134,6 +134,26 @@ private struct TestPayload: Codable, Equatable {
 	#expect(output == "panini")
 }
 
+@MainActor
+@Test func computeRunsInConfigDirectory() async throws {
+	// Block commands execute with the config root (~/.config/phbar) as their
+	// working directory, so a block from any set resolves relative paths the
+	// same way. Guards against the config dir being absent in sandboxed CIs.
+	guard FileManager.default.fileExists(atPath: PHBlock.configDirectory.path) else { return }
+
+	let blocks = try PHBlock.load(from: """
+	[[block]]
+	command = "pwd"
+	""")
+
+	let output = await blocks[0].compute()
+
+	// Resolve symlinks on both sides: `~/.config/phbar` is commonly a
+	// symlink into a dotfiles repo, and `pwd` reports the physical path.
+	let expected = PHBlock.configDirectory.resolvingSymlinksInPath().path
+	#expect(output == expected)
+}
+
 // MARK: - PHBlock Refresh
 
 @MainActor
@@ -143,7 +163,7 @@ private struct TestPayload: Codable, Equatable {
 	command = "printf panini"
 	""")[0]
 
-	#expect(block.label == "")
+	#expect(block.label == nil)
 
 	await block.update()
 
@@ -422,7 +442,7 @@ private final class FakeEventSource: PHEventSource {
 
 	let config = try PHConfig.load()
 	let theme = try PHTheme.load("voltage")
-	let controller = BarController(config: config, screen: screen, theme: theme, blocks: blocks)
+	let controller = BarController(config: config, screen: screen, theme: theme, blocks: blocks, debug: false)
 
 	controller.refresh()
 
@@ -433,3 +453,206 @@ private final class FakeEventSource: PHEventSource {
 	#expect(blocks[1].label == "b")
 }
 
+// MARK: - PHThemeDimension
+
+private struct DimensionWrapper: Decodable {
+	let v: PHThemeDimension
+}
+
+@Test func dimensionDecodesPoints() throws {
+	let decoder = JSONDecoder()
+	#expect(try decoder.decode(DimensionWrapper.self, from: Data(#"{"v":400}"#.utf8)).v == .points(400))
+	#expect(try decoder.decode(DimensionWrapper.self, from: Data(#"{"v":400.5}"#.utf8)).v == .points(400.5))
+}
+
+@Test func dimensionDecodesPercentage() throws {
+	let decoder = JSONDecoder()
+	#expect(try decoder.decode(DimensionWrapper.self, from: Data(#"{"v":"100%"}"#.utf8)).v == .percentage(1.0))
+	#expect(try decoder.decode(DimensionWrapper.self, from: Data(#"{"v":"50%"}"#.utf8)).v == .percentage(0.5))
+}
+
+@Test func dimensionRejectsGarbage() {
+	let decoder = JSONDecoder()
+	#expect(throws: (any Error).self) {
+		try decoder.decode(DimensionWrapper.self, from: Data(#"{"v":"wat"}"#.utf8))
+	}
+}
+
+@Test func dimensionResolvesAgainstLength() {
+	#expect(PHThemeDimension.points(250).resolve(against: 1000) == 250)
+	#expect(PHThemeDimension.percentage(0.25).resolve(against: 1000) == 250)
+}
+
+// MARK: - PHThemeAnchor geometry
+
+@Test func anchorPlacesAtTopEdge() {
+	let screen = CGRect(x: 0, y: 0, width: 1000, height: 800)
+	let size = CGSize(width: 1000, height: 30)
+	let origin = PHThemeAnchor.top.origin(in: screen, size: size, margin: .init())
+	#expect(origin == CGPoint(x: 0, y: 770))
+}
+
+@Test func anchorRespectsTopMargin() {
+	let screen = CGRect(x: 0, y: 0, width: 1000, height: 800)
+	let size = CGSize(width: 1000, height: 30)
+	let origin = PHThemeAnchor.top.origin(in: screen, size: size, margin: .init(top: 10))
+	#expect(origin == CGPoint(x: 0, y: 760))
+}
+
+@Test func anchorPlacesBottomLeadingCorner() {
+	let screen = CGRect(x: 0, y: 0, width: 1000, height: 800)
+	let size = CGSize(width: 200, height: 40)
+	let origin = PHThemeAnchor.bottomLeading.origin(
+		in: screen, size: size, margin: .init(bottom: 8, leading: 12)
+	)
+	#expect(origin == CGPoint(x: 12, y: 8))
+}
+
+@Test func anchorTrailingCentersVertically() {
+	let screen = CGRect(x: 0, y: 0, width: 1000, height: 800)
+	let size = CGSize(width: 200, height: 40)
+	let origin = PHThemeAnchor.trailing.origin(
+		in: screen, size: size, margin: .init(trailing: 20)
+	)
+	#expect(origin == CGPoint(x: 780, y: 380))
+}
+
+@Test func anchorCentersOnBothAxesIgnoringMargin() {
+	let screen = CGRect(x: 0, y: 0, width: 1000, height: 800)
+	let size = CGSize(width: 200, height: 40)
+	let origin = PHThemeAnchor.center.origin(in: screen, size: size, margin: .init(top: 999))
+	#expect(origin == CGPoint(x: 400, y: 380))
+}
+
+// MARK: - Monitor → window/blocks resolver
+
+@Test func windowNameFallsBackToGlobal() {
+	let config = PHConfig(window: "default", blocks: nil, env: nil, monitors: nil)
+	#expect(config.windowName(screenName: "Built-in", screenIndex: 0) == "default")
+}
+
+@Test func windowNameMatchesByIndex() {
+	let config = PHConfig(window: "default", blocks: nil, env: nil, monitors: ["1": .init(window: "bottom", blocks: nil)])
+	#expect(config.windowName(screenName: "Whatever", screenIndex: 1) == "bottom")
+}
+
+@Test func windowNameMatchesByName() {
+	let config = PHConfig(window: "default", blocks: nil, env: nil, monitors: ["DELL U2723QE": .init(window: "clock", blocks: nil)])
+	#expect(config.windowName(screenName: "DELL U2723QE", screenIndex: 0) == "clock")
+}
+
+@Test func monitorOverridePrefersNameOverIndex() {
+	let config = PHConfig(
+		window: "default", blocks: nil, env: nil,
+		monitors: ["0": .init(window: "byIndex", blocks: nil), "DELL": .init(window: "byName", blocks: nil)]
+	)
+	#expect(config.windowName(screenName: "DELL", screenIndex: 0) == "byName")
+}
+
+@Test func windowInheritsGlobalWhenOverrideOmitsIt() {
+	// Override sets blocks only → window falls back to the global.
+	let config = PHConfig(window: "top", blocks: nil, env: nil, monitors: ["1": .init(window: nil, blocks: "laptop")])
+	#expect(config.windowName(screenName: "S", screenIndex: 1) == "top")
+	#expect(config.blocksName(screenName: "S", screenIndex: 1) == "laptop")
+}
+
+@Test func blocksNameDefaultsToDefault() {
+	let config = PHConfig(window: "default", blocks: nil, env: nil, monitors: nil)
+	#expect(config.blocksName(screenName: "S", screenIndex: 0) == "default")
+}
+
+@Test func blocksNameUsesGlobalWhenNoOverride() {
+	let config = PHConfig(window: "default", blocks: "main", env: nil, monitors: nil)
+	#expect(config.blocksName(screenName: "S", screenIndex: 0) == "main")
+}
+
+@Test func blocksOverrideBeatsGlobal() {
+	let config = PHConfig(window: "default", blocks: "main", env: nil, monitors: ["1": .init(window: nil, blocks: "alt")])
+	#expect(config.blocksName(screenName: "S", screenIndex: 1) == "alt")
+}
+
+@Test func windowAndBlocksResolveIndependently() {
+	let config = PHConfig(
+		window: "top", blocks: "main", env: nil,
+		monitors: [
+			"DELL": .init(window: "clock", blocks: nil),   // inherits blocks "main"
+			"1": .init(window: nil, blocks: "laptop"),    // inherits window "top"
+		]
+	)
+	#expect(config.windowName(screenName: "DELL", screenIndex: 0) == "clock")
+	#expect(config.blocksName(screenName: "DELL", screenIndex: 0) == "main")
+	#expect(config.windowName(screenName: "S", screenIndex: 1) == "top")
+	#expect(config.blocksName(screenName: "S", screenIndex: 1) == "laptop")
+}
+
+// MARK: - PHBlock set loading
+
+private func makeBlocksConfigDir() throws -> URL {
+	let dir = FileManager.default.temporaryDirectory.appending(path: "phbar_blocks_\(UUID().uuidString)")
+	try FileManager.default.createDirectory(at: dir, withIntermediateDirectories: true)
+	return dir
+}
+
+@MainActor
+@Test func loadSetReadsNamedFile() throws {
+	let dir = try makeBlocksConfigDir()
+	defer { try? FileManager.default.removeItem(at: dir) }
+
+	let blocksDir = dir.appending(path: "blocks")
+	try FileManager.default.createDirectory(at: blocksDir, withIntermediateDirectories: true)
+	try Data("""
+	[[block]]
+	command = "echo hi"
+	name = "greeting"
+	""".utf8).write(to: blocksDir.appending(path: "laptop.toml"))
+
+	let blocks = try PHBlock.load("laptop", in: dir)
+
+	#expect(blocks.count == 1)
+	#expect(blocks[0].name == "greeting")
+}
+
+@MainActor
+@Test func loadSetThrowsForMissingSet() {
+	let dir = FileManager.default.temporaryDirectory.appending(path: "phbar_missing_\(UUID().uuidString)")
+	#expect(throws: (any Error).self) {
+		try PHBlock.load("nope", in: dir)
+	}
+}
+
+// MARK: - BarWindow.computeFrame
+
+@MainActor
+@Test func computeFrameDefaultsToFullScreenTopBar() throws {
+	let screen = try #require(NSScreen.main)
+	let theme = try PHTheme.load("voltage")
+	let config = PHConfig(window: "default", blocks: nil, env: nil, monitors: nil)
+	let blocks = try PHBlock.load(from: "[[block]]\ncommand = \"echo x\"")
+	let controller = BarController(config: config, screen: screen, theme: theme, blocks: blocks, debug: false)
+
+	let frame = BarWindow.computeFrame(from: controller)
+
+	#expect(frame.width == screen.frame.width)
+	#expect(frame.minX == screen.frame.minX)
+	#expect(frame.minY == screen.frame.maxY - 30)
+}
+
+@MainActor
+@Test func computeFrameUsesAbsoluteOriginOverAnchor() throws {
+	let screen = try #require(NSScreen.main)
+	let theme = PHTheme(
+		windows: [PHThemeWindow(name: "abs", anchor: .bottom, origin: PHThemePoint(x: 100, y: 200))],
+		texts: nil,
+		styles: nil
+	)
+	let config = PHConfig(window: "abs", blocks: nil, env: nil, monitors: nil)
+	let blocks = try PHBlock.load(from: "[[block]]\ncommand = \"echo x\"")
+	let controller = BarController(config: config, screen: screen, theme: theme, blocks: blocks, debug: false)
+
+	let frame = BarWindow.computeFrame(from: controller)
+
+	#expect(frame.origin == CGPoint(x: 100, y: 200))
+	#expect(frame.height == 30)
+}
+
+