diff --git a/src/app/styles/app.css b/src/app/styles/app.css
index f312953..e908072 100644
--- a/src/app/styles/app.css
+++ b/src/app/styles/app.css
@@ -2,117 +2,261 @@
 
 @import "tw-animate-css";
 
-@custom-variant dark (&:is(.dark *));
-
 :root {
-  --radius: 0.625rem;
-  --background: oklch(1 0 0);
-  --foreground: oklch(0.141 0.005 285.823);
-  --card: oklch(1 0 0);
-  --card-foreground: oklch(0.141 0.005 285.823);
+  /* Base font size */
+  --font-size: 16px;
+
+  /* GLYPHDIFF Swiss Design System */
+  /* Primary Colors */
+  --swiss-beige: #f3f0e9;
+  --swiss-red: #ff3b30;
+  --swiss-black: #1a1a1a;
+  --swiss-white: #ffffff;
+
+  /* Neutral Grays */
+  --neutral-50: #fafafa;
+  --neutral-100: #f5f5f5;
+  --neutral-200: #e5e5e5;
+  --neutral-300: #d4d4d4;
+  --neutral-400: #a3a3a3;
+  --neutral-500: #737373;
+  --neutral-600: #525252;
+  --neutral-700: #404040;
+  --neutral-800: #262626;
+  --neutral-900: #171717;
+
+  /* Dark Mode Backgrounds */
+  --dark-bg: #121212;
+  --dark-card: #1e1e1e;
+  --dark-border: rgba(255, 255, 255, 0.1);
+
+  /* Light Mode Backgrounds */
+  --light-bg: #f3f0e9;
+  --light-card: #ffffff;
+  --light-border: rgba(0, 0, 0, 0.05);
+
+  /* Semantic Colors */
+  --color-brand: var(--swiss-red);
+  --color-surface: var(--swiss-beige);
+  --color-paper: var(--swiss-white);
+
+  /* Base Tailwind Colors (for compatibility) */
+  --background: #ffffff;
+  --foreground: oklch(0.145 0 0);
+  --card: #ffffff;
+  --card-foreground: oklch(0.145 0 0);
   --popover: oklch(1 0 0);
-  --popover-foreground: oklch(0.141 0.005 285.823);
-  --primary: oklch(0.21 0.006 285.885);
-  --primary-foreground: oklch(0.985 0 0);
-  --secondary: oklch(0.967 0.001 286.375);
-  --secondary-foreground: oklch(0.21 0.006 285.885);
-  --muted: oklch(0.967 0.001 286.375);
-  --muted-foreground: oklch(0.552 0.016 285.938);
-  --accent: oklch(0.967 0.001 286.375);
-  --accent-foreground: oklch(0.21 0.006 285.885);
-  --destructive: oklch(0.577 0.245 27.325);
-  --border: oklch(0.92 0.004 286.32);
-  --input: oklch(0.92 0.004 286.32);
-  --ring: oklch(0.705 0.015 286.067);
+  --popover-foreground: oklch(0.145 0 0);
+  --primary: #030213;
+  --primary-foreground: oklch(1 0 0);
+  --secondary: oklch(0.95 0.0058 264.53);
+  --secondary-foreground: #030213;
+  --muted: #ececf0;
+  --muted-foreground: #717182;
+  --accent: #e9ebef;
+  --accent-foreground: #030213;
+  --destructive: #d4183d;
+  --destructive-foreground: #ffffff;
+  --border: rgba(0, 0, 0, 0.1);
+  --input: transparent;
+  --input-background: #f3f3f5;
+  --switch-background: #cbced4;
+  --font-weight-medium: 500;
+  --font-weight-normal: 400;
+  --ring: oklch(0.708 0 0);
   --chart-1: oklch(0.646 0.222 41.116);
   --chart-2: oklch(0.6 0.118 184.704);
   --chart-3: oklch(0.398 0.07 227.392);
   --chart-4: oklch(0.828 0.189 84.429);
   --chart-5: oklch(0.769 0.188 70.08);
+  --radius: 0rem;
   --sidebar: oklch(0.985 0 0);
-  --sidebar-foreground: oklch(0.141 0.005 285.823);
-  --sidebar-primary: oklch(0.21 0.006 285.885);
+  --sidebar-foreground: oklch(0.145 0 0);
+  --sidebar-primary: #030213;
   --sidebar-primary-foreground: oklch(0.985 0 0);
-  --sidebar-accent: oklch(0.967 0.001 286.375);
-  --sidebar-accent-foreground: oklch(0.21 0.006 285.885);
-  --sidebar-border: oklch(0.92 0.004 286.32);
-  --sidebar-ring: oklch(0.705 0.015 286.067);
+  --sidebar-accent: oklch(0.97 0 0);
+  --sidebar-accent-foreground: oklch(0.205 0 0);
+  --sidebar-border: oklch(0.922 0 0);
+  --sidebar-ring: oklch(0.708 0 0);
 
-  --background-20: oklch(1 0 0 / 20%);
-  --background-40: oklch(1 0 0 / 40%);
-  --background-60: oklch(1 0 0 / 60%);
-  --background-80: oklch(1 0 0 / 80%);
-  --background-95: oklch(1 0 0 / 95%);
-  --background-subtle: oklch(0.98 0 0);
-  --background-muted: oklch(0.97 0.002 286.375);
+  /* Spacing Scale (rem-based) */
+  --space-xs: 0.25rem;
+  --space-sm: 0.5rem;
+  --space-md: 0.75rem;
+  --space-lg: 1rem;
+  --space-xl: 1.5rem;
+  --space-2xl: 2rem;
+  --space-3xl: 3rem;
+  --space-4xl: 4rem;
 
-  --text-muted: oklch(0.552 0.016 285.938);
-  --text-subtle: oklch(0.705 0.015 286.067);
-  --text-soft: oklch(0.5 0.01 286);
+  /* Typography Scale */
+  --text-2xs: 0.625rem;
+  --text-xs: 0.75rem;
+  --text-sm: 0.875rem;
+  --text-base: 1rem;
+  --text-lg: 1.125rem;
+  --text-xl: 1.25rem;
+  --text-2xl: 1.5rem;
+  --text-3xl: 1.875rem;
+  --text-4xl: 2.25rem;
+  --text-5xl: 3rem;
+  --text-6xl: 3.75rem;
+  --text-7xl: 4.5rem;
+  --text-8xl: 6rem;
 
-  --border-subtle: oklch(0.95 0.003 286.32);
-  --border-muted: oklch(0.92 0.004 286.32);
-  --border-soft: oklch(0.88 0.005 286.32);
-
-  --gradient-from: oklch(0.98 0.002 286.32);
-  --gradient-via: oklch(1 0 0);
-  --gradient-to: oklch(0.98 0.002 286.32);
-
-  --font-mono: 'Major Mono Display';
+  /* Comparison Font Sizes */
+  --comparison-font-mobile: 3rem;
+  --comparison-font-tablet: 4.5rem;
+  --comparison-font-desktop: 6rem;
 }
 
 .dark {
-  --background: oklch(0.141 0.005 285.823);
+  --color-surface: var(--dark-bg);
+  --color-paper: var(--dark-card);
+
+  --background: oklch(0.145 0 0);
   --foreground: oklch(0.985 0 0);
-  --card: oklch(0.21 0.006 285.885);
+  --card: oklch(0.145 0 0);
   --card-foreground: oklch(0.985 0 0);
-  --popover: oklch(0.21 0.006 285.885);
+  --popover: oklch(0.145 0 0);
   --popover-foreground: oklch(0.985 0 0);
-  --primary: oklch(0.92 0.004 286.32);
-  --primary-foreground: oklch(0.21 0.006 285.885);
-  --secondary: oklch(0.274 0.006 286.033);
+  --primary: oklch(0.985 0 0);
+  --primary-foreground: oklch(0.205 0 0);
+  --secondary: oklch(0.269 0 0);
   --secondary-foreground: oklch(0.985 0 0);
-  --muted: oklch(0.274 0.006 286.033);
-  --muted-foreground: oklch(0.705 0.015 286.067);
-  --accent: oklch(0.274 0.006 286.033);
+  --muted: oklch(0.269 0 0);
+  --muted-foreground: oklch(0.708 0 0);
+  --accent: oklch(0.269 0 0);
   --accent-foreground: oklch(0.985 0 0);
-  --destructive: oklch(0.704 0.191 22.216);
-  --border: oklch(1 0 0 / 10%);
-  --input: oklch(1 0 0 / 15%);
-  --ring: oklch(0.552 0.016 285.938);
+  --destructive: oklch(0.396 0.141 25.723);
+  --destructive-foreground: oklch(0.637 0.237 25.331);
+  --border: oklch(0.269 0 0);
+  --input: oklch(0.269 0 0);
+  --ring: oklch(0.439 0 0);
+  --font-weight-medium: 500;
+  --font-weight-normal: 400;
   --chart-1: oklch(0.488 0.243 264.376);
   --chart-2: oklch(0.696 0.17 162.48);
   --chart-3: oklch(0.769 0.188 70.08);
   --chart-4: oklch(0.627 0.265 303.9);
   --chart-5: oklch(0.645 0.246 16.439);
-  --sidebar: oklch(0.21 0.006 285.885);
+  --sidebar: oklch(0.205 0 0);
   --sidebar-foreground: oklch(0.985 0 0);
   --sidebar-primary: oklch(0.488 0.243 264.376);
   --sidebar-primary-foreground: oklch(0.985 0 0);
-  --sidebar-accent: oklch(0.274 0.006 286.033);
+  --sidebar-accent: oklch(0.269 0 0);
   --sidebar-accent-foreground: oklch(0.985 0 0);
-  --sidebar-border: oklch(1 0 0 / 10%);
-  --sidebar-ring: oklch(0.552 0.016 285.938);
+  --sidebar-border: oklch(0.269 0 0);
+  --sidebar-ring: oklch(0.439 0 0);
+}
 
-  --background-20: oklch(0.21 0.006 285.885 / 20%);
-  --background-40: oklch(0.21 0.006 285.885 / 40%);
-  --background-60: oklch(0.21 0.006 285.885 / 60%);
-  --background-80: oklch(0.21 0.006 285.885 / 80%);
-  --background-95: oklch(0.21 0.006 285.885 / 95%);
-  --background-subtle: oklch(0.18 0.005 285.823);
-  --background-muted: oklch(0.274 0.006 286.033);
+@theme {
+  --color-background: var(--background);
+  --color-foreground: var(--foreground);
+  --color-card: var(--card);
+  --color-card-foreground: var(--card-foreground);
+  --color-popover: var(--popover);
+  --color-popover-foreground: var(--popover-foreground);
+  --color-primary: var(--primary);
+  --color-primary-foreground: var(--primary-foreground);
+  --color-secondary: var(--secondary);
+  --color-secondary-foreground: var(--secondary-foreground);
+  --color-muted: var(--muted);
+  --color-muted-foreground: var(--muted-foreground);
+  --color-accent: var(--accent);
+  --color-accent-foreground: var(--accent-foreground);
+  --color-destructive: var(--destructive);
+  --color-destructive-foreground: var(--destructive-foreground);
+  --color-border: var(--border);
+  --color-input: var(--input);
+  --color-input-background: var(--input-background);
+  --color-switch-background: var(--switch-background);
+  --color-ring: var(--ring);
+  --color-chart-1: var(--chart-1);
+  --color-chart-2: var(--chart-2);
+  --color-chart-3: var(--chart-3);
+  --color-chart-4: var(--chart-4);
+  --color-chart-5: var(--chart-5);
+  --radius-sm: 0rem;
+  --radius-md: 0rem;
+  --radius-lg: 0rem;
+  --radius-xl: 0rem;
+  --color-sidebar: var(--sidebar);
+  --color-sidebar-foreground: var(--sidebar-foreground);
+  --color-sidebar-primary: var(--sidebar-primary);
+  --color-sidebar-primary-foreground: var(--sidebar-primary-foreground);
+  --color-sidebar-accent: var(--sidebar-accent);
+  --color-sidebar-accent-foreground: var(--sidebar-accent-foreground);
+  --color-sidebar-border: var(--sidebar-border);
+  --color-sidebar-ring: var(--sidebar-ring);
 
-  --text-muted: oklch(0.705 0.015 286.067);
-  --text-subtle: oklch(0.552 0.016 285.938);
-  --text-soft: oklch(0.8 0.01 286);
+  --color-swiss-beige: var(--swiss-beige);
+  --color-swiss-red: var(--swiss-red);
+  --color-swiss-black: var(--swiss-black);
+  --color-swiss-white: var(--swiss-white);
+  --color-brand: var(--color-brand);
+  --color-surface: var(--color-surface);
+  --color-paper: var(--color-paper);
+  --color-dark-bg: var(--dark-bg);
+  --color-dark-card: var(--dark-card);
+}
 
-  --border-subtle: oklch(1 0 0 / 8%);
-  --border-muted: oklch(1 0 0 / 10%);
-  --border-soft: oklch(1 0 0 / 15%);
+@layer base {
+  * {
+    @apply border-border outline-ring/50;
+  }
 
-  --gradient-from: oklch(0.25 0.005 285.885);
-  --gradient-via: oklch(0.21 0.006 285.885);
-  --gradient-to: oklch(0.25 0.005 285.885);
+  body {
+    @apply bg-background text-foreground;
+    font-family: "Karla", system-ui, -apple-system, "Segoe UI", Inter, Roboto, Arial, sans-serif;
+    font-optical-sizing: auto;
+  }
+
+  html {
+    font-size: var(--font-size);
+  }
+
+  h1 {
+    font-size: var(--text-2xl);
+    font-weight: var(--font-weight-medium);
+    line-height: 1.5;
+  }
+
+  h2 {
+    font-size: var(--text-xl);
+    font-weight: var(--font-weight-medium);
+    line-height: 1.5;
+  }
+
+  h3 {
+    font-size: var(--text-lg);
+    font-weight: var(--font-weight-medium);
+    line-height: 1.5;
+  }
+
+  h4 {
+    font-size: var(--text-base);
+    font-weight: var(--font-weight-medium);
+    line-height: 1.5;
+  }
+
+  label {
+    font-size: var(--text-base);
+    font-weight: var(--font-weight-medium);
+    line-height: 1.5;
+  }
+
+  button {
+    font-size: var(--text-base);
+    font-weight: var(--font-weight-medium);
+    line-height: 1.5;
+  }
+
+  input {
+    font-size: var(--text-base);
+    font-weight: var(--font-weight-normal);
+    line-height: 1.5;
+  }
 }
 
 @theme inline {
@@ -171,17 +315,6 @@
   --font-sans: 'Karla', system-ui, -apple-system, 'Segoe UI', Inter, Roboto, Arial, sans-serif;
 }
 
-@layer base {
-  * {
-    @apply border-border outline-ring/50;
-  }
-  body {
-    @apply bg-background text-foreground;
-    font-family: "Karla", system-ui, -apple-system, "Segoe UI", Inter, Roboto, Arial, sans-serif;
-    font-optical-sizing: auto;
-  }
-}
-
 /* Global utility - useful across your app */
 @media (prefers-reduced-motion: reduce) {
     * {