From a8b197592b0c7176e833bd49a4e6ca6fc6d30271 Mon Sep 17 00:00:00 2001
From: Lars Gebhardt-Kusche <lars@kusche.berlin>
Date: Mon, 8 Jun 2026 00:30:18 +0200
Subject: [PATCH] UI Skins

---
 UMSETZUNGSSTATUS.md                           |   6 +
 partials/desktop/shell.php                    |  43 ++++++-
 public/assets/desktop/desktop.css             |  94 ++++++++++----
 public/assets/desktop/desktop.js              |  62 +++++----
 public/assets/desktop/skins/apple/profile.php |  16 +++
 public/assets/desktop/skins/apple/skin.css    |  50 ++++++++
 public/assets/desktop/skins/base/profile.php  |  16 +++
 public/assets/desktop/skins/base/skin.css     |  24 ++++
 public/assets/desktop/skins/linux/profile.php |  16 +++
 public/assets/desktop/skins/linux/skin.css    |  33 +++++
 .../assets/desktop/skins/windows/profile.php  |  16 +++
 public/assets/desktop/skins/windows/skin.css  |  37 ++++++
 src/App/App.php                               |   2 +
 src/Desktop/SkinResolver.php                  | 118 ++++++++++++++++--
 14 files changed, 476 insertions(+), 57 deletions(-)
 create mode 100644 public/assets/desktop/skins/apple/profile.php
 create mode 100644 public/assets/desktop/skins/apple/skin.css
 create mode 100644 public/assets/desktop/skins/base/profile.php
 create mode 100644 public/assets/desktop/skins/base/skin.css
 create mode 100644 public/assets/desktop/skins/linux/profile.php
 create mode 100644 public/assets/desktop/skins/linux/skin.css
 create mode 100644 public/assets/desktop/skins/windows/profile.php
 create mode 100644 public/assets/desktop/skins/windows/skin.css

diff --git a/UMSETZUNGSSTATUS.md b/UMSETZUNGSSTATUS.md
index 1e63f732..1a663310 100644
--- a/UMSETZUNGSSTATUS.md
+++ b/UMSETZUNGSSTATUS.md
@@ -73,6 +73,7 @@ Offen:
 
 - frei platzierbare Icons sind noch nicht umgesetzt
 - Layout und App-Anordnung des Startmenues sind noch offen
+- Skins muessen echte OS-Layouts 1:1 widerspiegeln: Farbschema, Leistenposition, Leistenverhalten, Fensterchrome und Desktop-Haptik fuer Windows, Apple und Linux Mint
 - persoenliche Startseite und oeffentliches Home sind noch nicht getrennt funktional
 - eingebettete Webseiten, Links, externe Integrationen und Dashboard-Inhalte fehlen
 
@@ -93,12 +94,14 @@ Erfuellt:
 - `src/Desktop/` ist als globaler Desktop-Core vorhanden
 - `public/assets/desktop/` und `partials/desktop/` sind angelegt
 - Trennung zwischen globalem System, Desktop-UI und Modulen ist strukturell vorbereitet
+- Skin-System wird auf gemeinsame Basis plus Skin-spezifische Ordnerstruktur vorbereitet
 
 Offen:
 
 - `modules/<modul>/` im neuen Projekt enthalten noch keine wirklich angebundenen Module
 - `partials/landingpages/` und `partials/structure/` sind nur minimal vorbereitet
 - `tools/` und `debug/` sind noch nicht mit Funktion befuellt
+- Skin-Ordnerkonzept mit `base`-Fallback sowie pro Skin getrennten Layout-/Asset-Dateien fachlich fertigziehen und abnehmen
 
 Nachweise:
 
@@ -149,6 +152,7 @@ Phase 2 Desktop-Grundfunktionen:
 - `TEILWEISE`: Statusbereich
 - `ERLEDIGT`: Uhr
 - `ERLEDIGT`: erstes Hauptmenue oeffnet und schliesst per Menu-Button
+- `OFFEN`: echte OS-spezifische Desktop-Layouts fuer Windows, Apple und Linux Mint
 
 Phase 3 Fenster-Manager:
 
@@ -156,6 +160,7 @@ Phase 3 Fenster-Manager:
 - `ERLEDIGT`: Fenster fokussieren
 - `ERLEDIGT`: Fenster minimieren
 - `ERLEDIGT`: Fenster maximieren
+- `ERLEDIGT`: Fenster-Layout und deckende Darstellung
 - `ERLEDIGT`: z-index-Verwaltung
 - `TEILWEISE`: Position und Groesse merken, technisch vorbereitet aber noch nicht abgenommen
 
@@ -258,6 +263,7 @@ Hauptdateien:
 
 ### Prioritaet A
 
+- echte OS-Skins mit eigenem Layout und Verhalten fuer Windows, Apple und Linux Mint fertigziehen
 - echtes Login mit Keycloak anbinden
 - persoenlichen Desktop-Zustand pro Nutzer speichern
 - Admin-App in echte Verwaltungsseiten zerlegen
diff --git a/partials/desktop/shell.php b/partials/desktop/shell.php
index 3a4337c2..f1eda32b 100644
--- a/partials/desktop/shell.php
+++ b/partials/desktop/shell.php
@@ -4,6 +4,8 @@ declare(strict_types=1);
 
 $payloadJson = json_encode($desktopPayload, JSON_THROW_ON_ERROR | JSON_PRETTY_PRINT);
 $activeSkin = $desktopPayload['meta']['active_skin'];
+$baseSkinProfile = $desktopPayload['meta']['base_skin_profile'];
+$skinProfile = $desktopPayload['meta']['skin_profile'];
 $wallpaper = $desktopPayload['desktop']['wallpaper'];
 ?><!DOCTYPE html>
 <html lang="de">
@@ -12,9 +14,37 @@ $wallpaper = $desktopPayload['desktop']['wallpaper'];
     <meta name="viewport" content="width=device-width, initial-scale=1">
     <title><?= htmlspecialchars($desktopPayload['meta']['title'], ENT_QUOTES) ?></title>
     <link rel="stylesheet" href="/assets/desktop/desktop.css">
+    <?php if (!empty($baseSkinProfile['css_path'])): ?>
+        <link rel="stylesheet" href="<?= htmlspecialchars((string) $baseSkinProfile['css_path'], ENT_QUOTES) ?>">
+    <?php endif; ?>
+    <?php if (!empty($skinProfile['css_path']) && $skinProfile['css_path'] !== $baseSkinProfile['css_path']): ?>
+        <link rel="stylesheet" href="<?= htmlspecialchars((string) $skinProfile['css_path'], ENT_QUOTES) ?>">
+    <?php endif; ?>
 </head>
-<body data-skin="<?= htmlspecialchars($activeSkin, ENT_QUOTES) ?>" style="--wallpaper: <?= htmlspecialchars($wallpaper, ENT_QUOTES) ?>;">
+<body
+    data-skin="<?= htmlspecialchars($activeSkin, ENT_QUOTES) ?>"
+    data-skin-family="<?= htmlspecialchars((string) ($skinProfile['family'] ?? $activeSkin), ENT_QUOTES) ?>"
+    data-taskbar-mode="<?= htmlspecialchars((string) ($skinProfile['taskbar_mode'] ?? 'taskbar'), ENT_QUOTES) ?>"
+    style="--wallpaper: <?= htmlspecialchars($wallpaper, ENT_QUOTES) ?>;"
+>
     <div class="desktop-shell">
+        <?php if (($skinProfile['top_bar'] ?? false) === true): ?>
+            <header class="system-bar">
+                <div class="system-bar-left">
+                    <span class="system-brand"><?= htmlspecialchars((string) ($skinProfile['label'] ?? ''), ENT_QUOTES) ?></span>
+                    <span class="system-divider"></span>
+                    <span>Finder</span>
+                    <span>Ablage</span>
+                    <span>Bearbeiten</span>
+                    <span>Fenster</span>
+                </div>
+                <div class="system-bar-right">
+                    <div class="tray-skins system-skins" id="tray-skins-top"></div>
+                    <span class="system-divider"></span>
+                    <time id="clock-top"></time>
+                </div>
+            </header>
+        <?php endif; ?>
         <main class="desktop-stage">
             <div class="desktop-icons" id="desktop-icons"></div>
 
@@ -61,7 +91,10 @@ $wallpaper = $desktopPayload['desktop']['wallpaper'];
             </section>
 
             <footer class="taskbar">
-                <button class="start-button" id="start-button" type="button">Menu</button>
+                <button class="start-button" id="start-button" type="button">
+                    <span class="start-button-icon"><?= htmlspecialchars((string) ($skinProfile['taskbar_icon'] ?? ''), ENT_QUOTES) ?></span>
+                    <span class="start-button-label"><?= htmlspecialchars((string) ($skinProfile['taskbar_label'] ?? 'Menu'), ENT_QUOTES) ?></span>
+                </button>
                 <div class="taskbar-apps" id="taskbar-apps"></div>
                 <div class="tray">
                     <?php foreach ($desktopPayload['tray'] as $trayItem): ?>
@@ -76,5 +109,11 @@ $wallpaper = $desktopPayload['desktop']['wallpaper'];
 
     <script id="desktop-payload" type="application/json"><?= $payloadJson ?></script>
     <script src="/assets/desktop/desktop.js"></script>
+    <?php if (!empty($baseSkinProfile['js_path'])): ?>
+        <script src="<?= htmlspecialchars((string) $baseSkinProfile['js_path'], ENT_QUOTES) ?>"></script>
+    <?php endif; ?>
+    <?php if (!empty($skinProfile['js_path']) && $skinProfile['js_path'] !== $baseSkinProfile['js_path']): ?>
+        <script src="<?= htmlspecialchars((string) $skinProfile['js_path'], ENT_QUOTES) ?>"></script>
+    <?php endif; ?>
 </body>
 </html>
diff --git a/public/assets/desktop/desktop.css b/public/assets/desktop/desktop.css
index ff57509d..fd993a7f 100644
--- a/public/assets/desktop/desktop.css
+++ b/public/assets/desktop/desktop.css
@@ -1,7 +1,6 @@
 :root {
     color-scheme: light;
     --shell-text: #f8fafc;
-    --shell-panel: rgba(15, 23, 42, 0.42);
     --shell-border: rgba(255, 255, 255, 0.16);
     --card-bg: rgba(255, 255, 255, 0.14);
     --window-bg: #f8fafc;
@@ -10,7 +9,18 @@
     --accent: #60a5fa;
     --taskbar-bg: rgba(15, 23, 42, 0.8);
     --shadow: 0 16px 40px rgba(15, 23, 42, 0.35);
-    font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
+    --desktop-font: "IBM Plex Sans", "Segoe UI", sans-serif;
+    --taskbar-height: 60px;
+    --taskbar-left: 24px;
+    --taskbar-right: 24px;
+    --taskbar-bottom: 24px;
+    --taskbar-width: auto;
+    --taskbar-radius: 22px;
+    --taskbar-justify: flex-start;
+    --stage-top-offset: 0px;
+    --icon-top: 24px;
+    --icon-left: 24px;
+    font-family: var(--desktop-font);
 }
 
 * {
@@ -24,24 +34,44 @@ body {
     color: var(--shell-text);
 }
 
-body[data-skin="apple"] {
-    --accent: #fb7185;
-    --taskbar-bg: rgba(45, 45, 45, 0.65);
-    --window-bg: #fffbeb;
-    --window-header-bg: #fff1d6;
-}
-
-body[data-skin="linux"] {
-    --accent: #f97316;
-    --taskbar-bg: rgba(17, 24, 39, 0.86);
-    --window-bg: #f9fafb;
-    --window-header-bg: #eceff3;
-}
-
 .desktop-shell {
     min-height: 100vh;
 }
 
+.system-bar {
+    position: fixed;
+    top: 0;
+    left: 0;
+    right: 0;
+    z-index: 140;
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+    height: 32px;
+    padding: 0 14px;
+    background: rgba(244, 244, 245, 0.82);
+    color: #111827;
+    backdrop-filter: blur(20px);
+}
+
+.system-bar-left,
+.system-bar-right {
+    display: flex;
+    align-items: center;
+    gap: 10px;
+    font-size: 13px;
+}
+
+.system-brand {
+    font-weight: 700;
+}
+
+.system-divider {
+    width: 1px;
+    height: 14px;
+    background: rgba(17, 24, 39, 0.2);
+}
+
 .eyebrow {
     margin: 0 0 12px;
     text-transform: uppercase;
@@ -79,8 +109,8 @@ h1 {
 
 .desktop-icons {
     position: absolute;
-    top: 24px;
-    left: 24px;
+    top: var(--icon-top);
+    left: var(--icon-left);
     z-index: 10;
     display: grid;
     grid-template-columns: repeat(auto-fill, minmax(96px, 1fr));
@@ -123,7 +153,7 @@ h1 {
 
 .widget-zone {
     position: absolute;
-    top: 24px;
+    top: calc(var(--stage-top-offset) + 24px);
     right: 24px;
     display: grid;
     gap: 14px;
@@ -298,14 +328,17 @@ h1 {
 
 .taskbar {
     position: fixed;
-    left: 24px;
-    right: 24px;
-    bottom: 24px;
+    left: var(--taskbar-left);
+    right: var(--taskbar-right);
+    bottom: var(--taskbar-bottom);
+    width: var(--taskbar-width);
     display: flex;
     align-items: center;
     gap: 16px;
+    justify-content: var(--taskbar-justify);
+    min-height: var(--taskbar-height);
     padding: 12px 16px;
-    border-radius: 22px;
+    border-radius: var(--taskbar-radius);
     background: var(--taskbar-bg);
     backdrop-filter: blur(18px);
     border: 1px solid var(--shell-border);
@@ -322,6 +355,18 @@ h1 {
     cursor: pointer;
 }
 
+.start-button {
+    display: inline-flex;
+    align-items: center;
+    gap: 8px;
+}
+
+.start-button-icon {
+    font-size: 11px;
+    font-weight: 700;
+    opacity: 0.8;
+}
+
 .taskbar-app-button.is-focused {
     background: var(--accent);
     color: #0f172a;
@@ -334,7 +379,7 @@ h1 {
 .start-menu {
     position: fixed;
     left: 24px;
-    bottom: 102px;
+    bottom: calc(var(--taskbar-height) + 28px);
     z-index: 130;
     display: grid;
     align-content: start;
@@ -485,6 +530,7 @@ h1 {
         left: 16px;
         right: 16px;
         bottom: 88px;
+        transform: none;
         width: auto;
         grid-template-columns: 1fr;
     }
diff --git a/public/assets/desktop/desktop.js b/public/assets/desktop/desktop.js
index 0962cde9..a4717641 100644
--- a/public/assets/desktop/desktop.js
+++ b/public/assets/desktop/desktop.js
@@ -12,10 +12,14 @@ if (payloadNode) {
     const startMenuWidgets = document.getElementById('start-menu-widgets');
     const startMenuActions = document.getElementById('start-menu-actions');
     const traySkins = document.getElementById('tray-skins');
+    const traySkinsTop = document.getElementById('tray-skins-top');
     const clockNode = document.getElementById('clock');
+    const clockTopNode = document.getElementById('clock-top');
     const windows = new Map();
     const activeWidgets = new Set(payload.widgets.active_ids);
     const activeSkin = payload.meta.active_skin;
+    const skinProfile = payload.meta.skin_profile || {};
+    const maximizeOverSystemBar = Boolean(skinProfile.maximize_over_system_bar);
     const storageScope = payload.desktop.storage_scope || 'guest';
     const storageKey = `desktop.kusche.berlin.window-state.${storageScope}`;
     let zIndex = 20;
@@ -57,10 +61,12 @@ if (payloadNode) {
         }
 
         const taskbar = document.querySelector('.taskbar');
+        const systemBar = document.querySelector('.system-bar');
         const stageRect = windowsRoot.getBoundingClientRect();
         const taskbarRect = taskbar ? taskbar.getBoundingClientRect() : null;
+        const systemBarRect = systemBar ? systemBar.getBoundingClientRect() : null;
 
-        topDesktopInset = 0;
+        topDesktopInset = systemBarRect ? Math.round(systemBarRect.height) : 0;
         sideDesktopInset = 0;
         bottomDesktopInset = taskbarRect
             ? Math.max(0, Math.round(stageRect.bottom - taskbarRect.top))
@@ -82,15 +88,19 @@ if (payloadNode) {
     };
 
     const renderClock = () => {
-        if (!clockNode) {
-            return;
-        }
-
-        clockNode.textContent = new Intl.DateTimeFormat('de-DE', {
+        const formatted = new Intl.DateTimeFormat('de-DE', {
             hour: '2-digit',
             minute: '2-digit',
             second: '2-digit',
         }).format(new Date());
+
+        if (clockNode) {
+            clockNode.textContent = formatted;
+        }
+
+        if (clockTopNode) {
+            clockTopNode.textContent = formatted;
+        }
     };
 
     const navigateToSkin = (skin) => {
@@ -98,20 +108,22 @@ if (payloadNode) {
     };
 
     const renderTraySkins = () => {
-        if (!traySkins) {
-            return;
-        }
+        [traySkins, traySkinsTop].forEach((container) => {
+            if (!container) {
+                return;
+            }
 
-        traySkins.innerHTML = '';
+            container.innerHTML = '';
 
-        payload.meta.available_skins.forEach((skin) => {
-            const button = document.createElement('button');
-            button.type = 'button';
-            button.className = `tray-skin-button${skin === activeSkin ? ' is-active' : ''}`;
-            button.textContent = skin.slice(0, 3).toUpperCase();
-            button.title = skin;
-            button.addEventListener('click', () => navigateToSkin(skin));
-            traySkins.appendChild(button);
+            payload.meta.available_skins.forEach((skin) => {
+                const button = document.createElement('button');
+                button.type = 'button';
+                button.className = `tray-skin-button${skin === activeSkin ? ' is-active' : ''}`;
+                button.textContent = skin.slice(0, 3).toUpperCase();
+                button.title = skin;
+                button.addEventListener('click', () => navigateToSkin(skin));
+                container.appendChild(button);
+            });
         });
     };
 
@@ -184,12 +196,13 @@ if (payloadNode) {
             record.state.maximized = true;
             record.node.classList.add('is-maximized');
             measureDesktopBounds();
+            const maximizedTopInset = maximizeOverSystemBar ? 0 : topDesktopInset;
             record.node.style.left = `${sideDesktopInset}px`;
-            record.node.style.top = `${topDesktopInset}px`;
+            record.node.style.top = `${maximizedTopInset}px`;
             record.node.style.width = sideDesktopInset === 0 ? '100%' : `calc(100% - ${sideDesktopInset * 2}px)`;
-            record.node.style.height = activeSkin === 'apple'
+            record.node.style.height = maximizeOverSystemBar
                 ? '100%'
-                : `calc(100% - ${topDesktopInset + bottomDesktopInset}px)`;
+                : `calc(100% - ${maximizedTopInset + bottomDesktopInset}px)`;
             focusWindow(windowId);
             saveWindowState();
             return;
@@ -417,12 +430,13 @@ if (payloadNode) {
         if (record.state.maximized) {
             record.node.classList.add('is-maximized');
             measureDesktopBounds();
+            const maximizedTopInset = maximizeOverSystemBar ? 0 : topDesktopInset;
             record.node.style.left = `${sideDesktopInset}px`;
-            record.node.style.top = `${topDesktopInset}px`;
+            record.node.style.top = `${maximizedTopInset}px`;
             record.node.style.width = sideDesktopInset === 0 ? '100%' : `calc(100% - ${sideDesktopInset * 2}px)`;
-            record.node.style.height = activeSkin === 'apple'
+            record.node.style.height = maximizeOverSystemBar
                 ? '100%'
-                : `calc(100% - ${topDesktopInset + bottomDesktopInset}px)`;
+                : `calc(100% - ${maximizedTopInset + bottomDesktopInset}px)`;
         }
 
         node.addEventListener('mousedown', () => focusWindow(record.id));
diff --git a/public/assets/desktop/skins/apple/profile.php b/public/assets/desktop/skins/apple/profile.php
new file mode 100644
index 00000000..ae92cec1
--- /dev/null
+++ b/public/assets/desktop/skins/apple/profile.php
@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+return [
+    'id' => 'apple',
+    'label' => 'Apple',
+    'family' => 'apple',
+    'wallpaper' => 'radial-gradient(circle at top, #ffe7ba 0%, #ff9a62 38%, #531b53 100%)',
+    'top_bar' => true,
+    'taskbar_mode' => 'dock',
+    'taskbar_label' => 'Launchpad',
+    'taskbar_icon' => 'Mac',
+    'window_controls' => 'mac',
+    'maximize_over_system_bar' => true,
+];
diff --git a/public/assets/desktop/skins/apple/skin.css b/public/assets/desktop/skins/apple/skin.css
new file mode 100644
index 00000000..398d3f3f
--- /dev/null
+++ b/public/assets/desktop/skins/apple/skin.css
@@ -0,0 +1,50 @@
+body[data-skin="apple"] {
+    --accent: #fb7185;
+    --taskbar-bg: rgba(45, 45, 45, 0.65);
+    --window-bg: #fffbeb;
+    --window-header-bg: #fff1d6;
+    --desktop-font: "SF Pro Display", "Helvetica Neue", sans-serif;
+    --taskbar-height: 72px;
+    --taskbar-left: 50%;
+    --taskbar-right: auto;
+    --taskbar-bottom: 18px;
+    --taskbar-width: auto;
+    --taskbar-radius: 24px;
+    --taskbar-justify: center;
+    --stage-top-offset: 34px;
+    --icon-top: 56px;
+}
+
+body[data-skin="apple"] .system-bar {
+    background: rgba(244, 244, 245, 0.82);
+    color: #111827;
+}
+
+body[data-skin="apple"] .taskbar {
+    transform: translateX(-50%);
+    border: 1px solid rgba(255, 255, 255, 0.26);
+    box-shadow: 0 18px 40px rgba(17, 24, 39, 0.22);
+}
+
+body[data-skin="apple"] .start-button {
+    order: 2;
+    min-width: 92px;
+    justify-content: center;
+    background: rgba(255, 255, 255, 0.24);
+}
+
+body[data-skin="apple"] .tray {
+    order: 1;
+    flex: 0 0 auto;
+}
+
+body[data-skin="apple"] .taskbar-apps {
+    order: 3;
+    justify-content: center;
+}
+
+body[data-skin="apple"] .start-menu {
+    left: 50%;
+    bottom: 106px;
+    transform: translateX(-50%);
+}
diff --git a/public/assets/desktop/skins/base/profile.php b/public/assets/desktop/skins/base/profile.php
new file mode 100644
index 00000000..bb66cbf3
--- /dev/null
+++ b/public/assets/desktop/skins/base/profile.php
@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+return [
+    'id' => 'base',
+    'label' => 'Base',
+    'family' => 'base',
+    'wallpaper' => 'linear-gradient(160deg, #1d4ed8 0%, #0f172a 100%)',
+    'top_bar' => false,
+    'taskbar_mode' => 'taskbar',
+    'taskbar_label' => 'Menu',
+    'taskbar_icon' => 'OS',
+    'window_controls' => 'windows',
+    'maximize_over_system_bar' => false,
+];
diff --git a/public/assets/desktop/skins/base/skin.css b/public/assets/desktop/skins/base/skin.css
new file mode 100644
index 00000000..85c53255
--- /dev/null
+++ b/public/assets/desktop/skins/base/skin.css
@@ -0,0 +1,24 @@
+.tray-skins,
+.system-skins {
+    display: inline-flex;
+    align-items: center;
+    gap: 6px;
+}
+
+.tray-skin-button {
+    min-width: 38px;
+    height: 28px;
+    padding: 0 10px;
+    border: 1px solid rgba(255, 255, 255, 0.18);
+    border-radius: 999px;
+    background: rgba(255, 255, 255, 0.08);
+    color: inherit;
+    font-size: 11px;
+    font-weight: 700;
+    letter-spacing: 0.04em;
+    cursor: pointer;
+}
+
+.tray-skin-button.is-active {
+    background: rgba(255, 255, 255, 0.24);
+}
diff --git a/public/assets/desktop/skins/linux/profile.php b/public/assets/desktop/skins/linux/profile.php
new file mode 100644
index 00000000..3e9dc3cd
--- /dev/null
+++ b/public/assets/desktop/skins/linux/profile.php
@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+return [
+    'id' => 'linux',
+    'label' => 'Linux Mint',
+    'family' => 'linux-mint',
+    'wallpaper' => 'linear-gradient(140deg, #123329 0%, #1f5d4f 45%, #0f172a 100%)',
+    'top_bar' => false,
+    'taskbar_mode' => 'panel',
+    'taskbar_label' => 'Menu',
+    'taskbar_icon' => 'Mint',
+    'window_controls' => 'linux',
+    'maximize_over_system_bar' => false,
+];
diff --git a/public/assets/desktop/skins/linux/skin.css b/public/assets/desktop/skins/linux/skin.css
new file mode 100644
index 00000000..507537e3
--- /dev/null
+++ b/public/assets/desktop/skins/linux/skin.css
@@ -0,0 +1,33 @@
+body[data-skin="linux"] {
+    --accent: #86efac;
+    --taskbar-bg: linear-gradient(180deg, rgba(33, 46, 42, 0.98), rgba(21, 31, 28, 0.98));
+    --window-bg: #f9fafb;
+    --window-header-bg: #eceff3;
+    --desktop-font: "Noto Sans", "Ubuntu", sans-serif;
+    --taskbar-height: 48px;
+    --taskbar-left: 0;
+    --taskbar-right: 0;
+    --taskbar-bottom: 0;
+    --taskbar-width: 100%;
+    --taskbar-radius: 0;
+    --taskbar-justify: flex-start;
+}
+
+body[data-skin="linux"] .taskbar {
+    border-left: 0;
+    border-right: 0;
+    border-bottom: 0;
+    backdrop-filter: none;
+    box-shadow: 0 -10px 24px rgba(0, 0, 0, 0.16);
+}
+
+body[data-skin="linux"] .start-button {
+    border-radius: 10px;
+    background: linear-gradient(180deg, rgba(92, 185, 118, 0.24), rgba(55, 110, 75, 0.28));
+}
+
+body[data-skin="linux"] .start-menu {
+    left: 12px;
+    bottom: 58px;
+    border-radius: 18px 18px 0 0;
+}
diff --git a/public/assets/desktop/skins/windows/profile.php b/public/assets/desktop/skins/windows/profile.php
new file mode 100644
index 00000000..82d538da
--- /dev/null
+++ b/public/assets/desktop/skins/windows/profile.php
@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+return [
+    'id' => 'windows',
+    'label' => 'Windows',
+    'family' => 'windows',
+    'wallpaper' => 'linear-gradient(160deg, #1d4ed8 0%, #0f172a 100%)',
+    'top_bar' => false,
+    'taskbar_mode' => 'taskbar',
+    'taskbar_label' => 'Start',
+    'taskbar_icon' => 'Win',
+    'window_controls' => 'windows',
+    'maximize_over_system_bar' => false,
+];
diff --git a/public/assets/desktop/skins/windows/skin.css b/public/assets/desktop/skins/windows/skin.css
new file mode 100644
index 00000000..56321ff7
--- /dev/null
+++ b/public/assets/desktop/skins/windows/skin.css
@@ -0,0 +1,37 @@
+body[data-skin="windows"] {
+    --accent: #60a5fa;
+    --taskbar-bg: linear-gradient(180deg, rgba(24, 39, 75, 0.94), rgba(15, 23, 42, 0.96));
+    --window-bg: #f8fafc;
+    --window-header-bg: linear-gradient(180deg, #eff6ff, #dbeafe);
+    --desktop-font: "Segoe UI", "IBM Plex Sans", sans-serif;
+    --taskbar-height: 54px;
+    --taskbar-left: 0;
+    --taskbar-right: 0;
+    --taskbar-bottom: 0;
+    --taskbar-width: 100%;
+    --taskbar-radius: 0;
+    --taskbar-justify: flex-start;
+    --icon-top: 22px;
+    --icon-left: 24px;
+}
+
+body[data-skin="windows"] .taskbar {
+    padding: 8px 14px;
+    border-left: 0;
+    border-right: 0;
+    border-bottom: 0;
+    backdrop-filter: blur(12px);
+}
+
+body[data-skin="windows"] .start-button {
+    min-width: 94px;
+    justify-content: center;
+    border-radius: 8px;
+    background: rgba(255, 255, 255, 0.14);
+}
+
+body[data-skin="windows"] .start-menu {
+    left: 12px;
+    bottom: 62px;
+    border-radius: 14px 14px 0 0;
+}
diff --git a/src/App/App.php b/src/App/App.php
index 5676f8ec..5498f6ed 100644
--- a/src/App/App.php
+++ b/src/App/App.php
@@ -34,6 +34,8 @@ final class App
                 'title' => 'Kusche.Berlin Desktop UI',
                 'active_skin' => $activeSkin,
                 'available_skins' => $skins,
+                'base_skin_profile' => SkinResolver::profile('base'),
+                'skin_profile' => SkinResolver::profile($activeSkin),
             ],
             'desktop' => [
                 'greeting' => 'Neue Desktop-Shell fuer Kusche.Berlin',
diff --git a/src/Desktop/SkinResolver.php b/src/Desktop/SkinResolver.php
index 8c401521..0c8275f1 100644
--- a/src/Desktop/SkinResolver.php
+++ b/src/Desktop/SkinResolver.php
@@ -6,27 +6,131 @@ namespace Desktop;
 
 final class SkinResolver
 {
+    private const DEFAULT_SKIN = 'windows';
+
     /**
      * @return array<int, string>
      */
     public static function all(): array
     {
-        return ['windows', 'apple', 'linux'];
+        return array_values(array_filter(
+            array_keys(self::profiles()),
+            static fn (string $skin): bool => $skin !== 'base'
+        ));
     }
 
     public static function resolve(?string $requestedSkin): string
     {
         $skin = strtolower((string) $requestedSkin);
 
-        return in_array($skin, self::all(), true) ? $skin : 'windows';
+        return in_array($skin, self::all(), true) ? $skin : self::DEFAULT_SKIN;
     }
 
     public static function wallpaper(string $skin): string
     {
-        return match ($skin) {
-            'apple' => 'radial-gradient(circle at top, #ffe7ba 0%, #ff9a62 38%, #531b53 100%)',
-            'linux' => 'linear-gradient(140deg, #111827 0%, #1f2937 40%, #ea580c 100%)',
-            default => 'linear-gradient(160deg, #1d4ed8 0%, #0f172a 100%)',
-        };
+        return (string) (self::profile($skin)['wallpaper'] ?? '');
+    }
+
+    /**
+     * @return array<string, array<string, mixed>>
+     */
+    public static function profiles(): array
+    {
+        static $profiles;
+
+        if (is_array($profiles)) {
+            return $profiles;
+        }
+
+        $profiles = [];
+        $skinsPath = self::skinsPath();
+        $directories = glob($skinsPath . '/*', GLOB_ONLYDIR) ?: [];
+
+        foreach ($directories as $directory) {
+            $skinId = basename($directory);
+            $profilePath = $directory . '/profile.php';
+
+            if (!is_file($profilePath)) {
+                continue;
+            }
+
+            /** @var array<string, mixed> $profile */
+            $profile = require $profilePath;
+            $profiles[$skinId] = array_merge(
+                [
+                    'id' => $skinId,
+                    'label' => ucfirst($skinId),
+                    'family' => $skinId,
+                    'wallpaper' => '',
+                    'top_bar' => false,
+                    'taskbar_mode' => 'taskbar',
+                    'taskbar_label' => 'Menu',
+                    'taskbar_icon' => strtoupper(substr($skinId, 0, 3)),
+                    'window_controls' => 'windows',
+                    'maximize_over_system_bar' => false,
+                ],
+                $profile,
+                self::assetManifest($skinId)
+            );
+        }
+
+        if (!isset($profiles['base'])) {
+            $profiles['base'] = array_merge(
+                [
+                    'id' => 'base',
+                    'label' => 'Base',
+                    'family' => 'base',
+                    'wallpaper' => '',
+                    'top_bar' => false,
+                    'taskbar_mode' => 'taskbar',
+                    'taskbar_label' => 'Menu',
+                    'taskbar_icon' => 'OS',
+                    'window_controls' => 'windows',
+                    'maximize_over_system_bar' => false,
+                ],
+                self::assetManifest('base')
+            );
+        }
+
+        return $profiles;
+    }
+
+    /**
+     * @return array<string, mixed>
+     */
+    public static function profile(string $skin): array
+    {
+        $profiles = self::profiles();
+        $baseProfile = $profiles['base'] ?? [];
+
+        if ($skin === 'base') {
+            return $baseProfile;
+        }
+
+        $resolvedSkin = self::resolve($skin);
+
+        return array_merge(
+            $baseProfile,
+            $profiles[$resolvedSkin] ?? $profiles[self::DEFAULT_SKIN] ?? $baseProfile
+        );
+    }
+
+    private static function skinsPath(): string
+    {
+        return dirname(__DIR__, 2) . '/public/assets/desktop/skins';
+    }
+
+    /**
+     * @return array<string, string|null>
+     */
+    private static function assetManifest(string $skin): array
+    {
+        $basePath = self::skinsPath() . '/' . $skin;
+        $publicBasePath = '/assets/desktop/skins/' . $skin;
+
+        return [
+            'css_path' => is_file($basePath . '/skin.css') ? $publicBasePath . '/skin.css' : null,
+            'js_path' => is_file($basePath . '/skin.js') ? $publicBasePath . '/skin.js' : null,
+        ];
     }
 }