3 files changed, 171 insertions, 0 deletions
diff --git a/theme/Main.qml b/theme/Main.qml
new file mode 100644
index 0000000..f1b91ee
--- /dev/null
+++ b/theme/Main.qml
@@ -0,0 +1,126 @@
+// SPDX-License-Identifier: GPL-2.0-only
+// Copyright (C) 2026 Danilo M. <danix@danix.xyz>
+//
+// UDT SDDM greeter. The root item spans every screen. The wallpaper is drawn
+// once per screen; the login card is pinned to one screen (config uiScreen,
+// else the primary screen); input wakes the card after it fades.
+
+import QtQuick
+
+Item {
+    id: root
+
+    // SDDM sizes the greeter to the union of every screen.
+    readonly property var union: screenModel.geometry(-1)
+    width: union.width
+    height: union.height
+
+    // Palette. Values come from theme.conf, overridden live by theme.conf.user.
+    readonly property string baseColor: config.stringValue("base")
+    readonly property int cardRadius: 10
+    readonly property string wallpaperUrl:
+        config.stringValue("background") === ""
+            ? ""
+            : "file://" + config.stringValue("background")
+
+    readonly property string wantedScreen: config.stringValue("uiScreen")
+    property var primaryGeometry: screenModel.geometry(screenModel.primary >= 0 ? screenModel.primary : 0)
+    property var namedGeometry: primaryGeometry
+    readonly property var cardGeometry: wantedScreen === "" ? primaryGeometry : namedGeometry
+
+    // The Image delegate of the screen the card sits on. The frosted card
+    // samples it. Null until the model has populated.
+    property Item cardScreenImage: null
+
+    Repeater {
+        id: screens
+        model: screenModel
+        delegate: Item {
+            x: geometry.x
+            y: geometry.y
+            width: geometry.width
+            height: geometry.height
+
+            Image {
+                id: screenImage
+                anchors.fill: parent
+                source: root.wallpaperUrl
+                fillMode: Image.PreserveAspectCrop
+                sourceSize.width: parent.width
+                sourceSize.height: parent.height
+                smooth: true
+                asynchronous: true
+            }
+
+            // Scrim so the card and text read on any wallpaper.
+            Rectangle {
+                anchors.fill: parent
+                color: root.baseColor
+                opacity: 0.45
+            }
+
+            readonly property string screenName: name
+
+            Component.onCompleted: root.registerScreen(index, screenName, screenImage, geometry)
+        }
+    }
+
+    // Filled as the model populates: the primary screen's name, and the
+    // wallpaper image plus geometry of whichever screen owns the card.
+    property string primaryName: ""
+
+    function registerScreen(index, screenName, image, geom) {
+        if (index === screenModel.primary)
+            root.primaryName = screenName
+        if (screenName === root.cardScreenName()) {
+            root.cardScreenImage = image
+            root.namedGeometry = geom
+        }
+    }
+
+    function cardScreenName() {
+        return root.wantedScreen !== "" ? root.wantedScreen : root.primaryName
+    }
+
+    // Idle: fade the card after fadeoutMs, restore on any input.
+    property bool uiVisible: true
+
+    Timer {
+        id: idle
+        interval: config.intValue("fadeoutMs") > 0 ? config.intValue("fadeoutMs") : 60000
+        running: root.uiVisible
+        repeat: false
+        onTriggered: root.uiVisible = false
+    }
+
+    function wake() {
+        root.uiVisible = true
+        idle.restart()
+    }
+
+    MouseArea {
+        anchors.fill: parent
+        hoverEnabled: true
+        onPressed: root.wake()
+        onPositionChanged: root.wake()
+    }
+
+    Keys.onPressed: event => {
+        root.wake()
+        event.accepted = false
+    }
+
+    // Placeholder card. Task 2 replaces this with components/LoginCard.qml.
+    Rectangle {
+        id: card
+        x: root.cardGeometry.x + (root.cardGeometry.width - width) / 2
+        y: root.cardGeometry.y + (root.cardGeometry.height - height) / 2
+        width: 380
+        height: 220
+        radius: root.cardRadius
+        color: config.stringValue("mantle")
+        opacity: root.uiVisible ? 0.9 : 0
+        visible: opacity > 0
+        Behavior on opacity { NumberAnimation { duration: 260; easing.type: Easing.OutCubic } }
+    }
+}
diff --git a/theme/metadata.desktop b/theme/metadata.desktop
new file mode 100644
index 0000000..e345597
--- /dev/null
+++ b/theme/metadata.desktop
@@ -0,0 +1,12 @@
+[SddmGreeterTheme]
+Name=UDT
+Description=Unified Desktop Theme login screen
+Author=Danilo M.
+Copyright=(c) 2026 Danilo M.
+License=GPL-2.0-only
+Type=sddm-theme
+Version=0.1
+MainScript=Main.qml
+ConfigFile=theme.conf
+Theme-API=2.0
+QtVersion=6
diff --git a/theme/theme.conf b/theme/theme.conf
new file mode 100644
index 0000000..c2b8269
--- /dev/null
+++ b/theme/theme.conf
@@ -0,0 +1,33 @@
+# Static defaults and fallbacks. udt-accent writes the live values into
+# theme.conf.user, which SDDM merges over this file. Every key here is the
+# Catppuccin Macchiato value of the matching UDT role, so the theme parses and
+# renders before a wallpaper has ever been set.
+[General]
+type=image
+background=
+
+base=#24273a
+mantle=#1e2030
+crust=#181926
+surface0=#363a4f
+surface1=#494d64
+surface2=#5b6078
+text=#cad3f5
+subtext0=#a5adcb
+subtext1=#b8c0e0
+overlay0=#6e738d
+overlay1=#8087a2
+overlay2=#939ab7
+red=#ed8796
+yellow=#eed49f
+green=#a6da95
+teal=#8bd5ca
+blue=#8aadf4
+lavender=#b7bdf8
+accent=#b7bdf8
+
+# Empty uiScreen pins the card to the primary screen.
+uiScreen=
+# 60000 matches the stock theme's idle timeout.
+fadeoutMs=60000
+blur=true