Darkmode implemented

There is now a darkmode button

frontend/src/styles/_variables.scss

@@ -1,15 +1,15 @@
 // Color Palette (Reference Style)
-$color-bg: #f0f2f5;
-$color-bg-dark: #121212;
-$color-container: #ffffff;
-$color-container-dark: #333333;
+$color-bg: var(--color-bg);
+$color-bg-dark: var(--color-bg-dark);
+$color-container: var(--color-container);
+$color-container-dark: var(--color-container-dark);
 $color-sidebar: #0f172a;
 $color-primary: #2b79c2;
 $color-primary-hover: #1d5fa0;
 $color-accent: #2b79c2;
 $color-muted: #6b7280;
-$color-text: #111827;
-$color-text-dark: #e2e2e2;
+$color-text: var(--color-text);
+$color-text-dark: var(--color-text-dark);
 
 // Status Colors
 $color-status-todo: #ffcccc;

frontend/src/styles/components/_dark_mode.scss

@@ -0,0 +1,75 @@
+:root {
+  --color-bg: #f0f2f5;
+  --color-bg-dark: #121212;
+  --color-container: #ffffff;
+  --color-container-dark: #333333;
+  --color-text: #111827;
+  --color-text-dark: #e2e2e2;
+}
+
+// Automatically respect standard media query if no override is set
+@media (prefers-color-scheme: dark) {
+  :root {
+    --color-bg: #121212;
+    --color-container: #333333;
+    --color-text: #e2e2e2;
+  }
+}
+
+// Force Light Mode overrides
+body.theme-light {
+  --color-bg: #f0f2f5;
+  --color-bg-dark: #f0f2f5;
+  --color-container: #ffffff;
+  --color-container-dark: #ffffff;
+  --color-text: #111827;
+  --color-text-dark: #111827;
+}
+
+// Force Dark Mode overrides
+body.theme-dark {
+  --color-bg: #121212;
+  --color-bg-dark: #121212;
+  --color-container: #333333;
+  --color-container-dark: #333333;
+  --color-text: #e2e2e2;
+  --color-text-dark: #e2e2e2;
+}
+
+// Fixed positioning ensures NO other component's layout is ever altered
+.dark-mode-toggle {
+  position: fixed;
+  top: 1rem;
+  right: 1rem;
+  z-index: 9999;
+  width: 55px;
+  height: 55px;
+  border-radius: 50%;
+  border: 1px solid rgba(128, 128, 128, 0.2);
+  background-color: var(--color-container);
+  color: var(--color-text);
+  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
+  cursor: pointer;
+  transition: all 0.2s ease-in-out;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  padding: 0;
+
+  svg {
+    width: 36px;
+    height: 36px;
+    stroke: var(--color-text);
+    transition: stroke 0.2s ease-in-out;
+  }
+
+  &:hover {
+    transform: translateY(-1px);
+    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.15);
+    background-color: var(--color-bg);
+  }
+
+  &:active {
+    transform: translateY(0);
+  }
+}

frontend/src/styles/main.scss

@@ -10,6 +10,7 @@
 @use "components/diagnostics";
 @use "components/pages";
 @use "components/setup";
+@use "components/dark_mode";
 
 * {
   box-sizing: border-box;