diff --git a/assets/app.ts b/assets/app.ts
index f69ebe1..7e55b54 100644
--- a/assets/app.ts
+++ b/assets/app.ts
@@ -5,5 +5,7 @@
  * (and its CSS file) in your base layout (base.html.twig).
  */
 
+// require('bootstrap');
+
 // any CSS you import will output into a single css file (app.scss in this case)
 import './styles/app.scss';
diff --git a/assets/styles/app.scss b/assets/styles/app.scss
index cb33b13..9f508aa 100644
--- a/assets/styles/app.scss
+++ b/assets/styles/app.scss
@@ -1,3 +1,379 @@
-body {
-    background-color: lightgray;
+// =============================================================================
+// Design Tokens — SCSS Variables
+// =============================================================================
+
+// Surface palette
+$color-surface:                   #0b1326;
+$color-surface-dim:               #0b1326;
+$color-surface-bright:            #31394d;
+$color-surface-container-lowest:  #060e20;
+$color-surface-container-low:     #131b2e;
+$color-surface-container:         #171f33;
+$color-surface-container-high:    #222a3d;
+$color-surface-container-highest: #2d3449;
+$color-on-surface:                #dae2fd;
+$color-on-surface-variant:        #c0c7d3;
+$color-inverse-surface:           #dae2fd;
+$color-inverse-on-surface:        #283044;
+$color-outline:                   #8a919d;
+$color-outline-variant:           #404751;
+$color-surface-tint:              #9dcaff;
+$color-surface-variant:           #2d3449;
+
+// Primary — Electric Azure
+$color-primary:              #9dcaff;
+$color-on-primary:           #003257;
+$color-primary-container:    #50a7fa;
+$color-on-primary-container: #003b65;
+$color-inverse-primary:      #0061a2;
+
+// Secondary
+$color-secondary:              #89ceff;
+$color-on-secondary:           #00344d;
+$color-secondary-container:    #00a2e6;
+$color-on-secondary-container: #00344e;
+
+// Tertiary (indigo accent)
+$color-tertiary:              #c0c1ff;
+$color-on-tertiary:           #1000a9;
+$color-tertiary-container:    #9598ff;
+$color-on-tertiary-container: #1c16b1;
+
+// Error
+$color-error:              #ffb4ab;
+$color-on-error:           #690005;
+$color-error-container:    #93000a;
+$color-on-error-container: #ffdad6;
+
+// Background
+$color-background:    #0b1326;
+$color-on-background: #dae2fd;
+
+// Typography stacks
+$font-display: 'Space Grotesk', system-ui, sans-serif;
+$font-body:    'Geist', system-ui, -apple-system, sans-serif;
+$font-mono:    'JetBrains Mono', 'Courier New', monospace;
+
+// Border radius scale
+$radius-sm:      0.25rem;
+$radius-default: 0.5rem;
+$radius-md:      0.75rem;
+$radius-lg:      1rem;
+$radius-xl:      1.5rem;
+$radius-full:    9999px;
+
+// =============================================================================
+// Bootstrap Variable Overrides
+// Must be declared before @import for !default overrides to take effect.
+// Bootstrap 5.x uses @import internally — @use with() is not supported.
+// =============================================================================
+
+// Semantic color map
+$primary:   $color-primary-container; // #50a7fa — Electric Azure
+$secondary: $color-secondary;         // #89ceff
+$success:   #4ade80;
+$info:      $color-primary;           // #9dcaff
+$warning:   #fbbf24;
+$danger:    $color-error;             // #ffb4ab
+$light:     $color-surface-bright;   // #31394d
+$dark:      $color-surface-container-lowest; // #060e20
+
+// Body
+$body-bg:               $color-background;       // #0b1326
+$body-color:            $color-on-surface;        // #dae2fd
+$body-secondary-color:  $color-on-surface-variant; // #c0c7d3
+
+// Links
+$link-color:       $color-primary;           // #9dcaff
+$link-hover-color: $color-primary-container; // #50a7fa
+
+// Borders
+$border-color: $color-outline-variant; // #404751
+
+// Border radius
+$border-radius:      $radius-default; // 0.5rem
+$border-radius-sm:   $radius-sm;      // 0.25rem
+$border-radius-lg:   $radius-md;      // 0.75rem
+$border-radius-xl:   $radius-lg;      // 1rem
+$border-radius-xxl:  $radius-xl;      // 1.5rem
+$border-radius-pill: $radius-full;    // 9999px
+
+// Typography
+$font-family-sans-serif: $font-body;
+$font-family-monospace:  $font-mono;
+$font-size-base:         1rem;   // 16px
+$line-height-base:       1.5;
+
+// Headings
+$headings-font-family:  $font-display;
+$headings-font-weight:  600;
+$headings-line-height:  1.3;
+$headings-color:        $color-on-surface;
+
+// Grid
+$grid-gutter-width: 1.5rem; // 24px
+$container-max-widths: (
+  sm:  540px,
+  md:  720px,
+  lg:  960px,
+  xl:  1140px,
+  xxl: 1280px,
+);
+
+// Cards
+$card-bg:           $color-surface-container;
+$card-border-color: $color-outline-variant;
+$card-cap-bg:       transparent;
+
+// Form inputs
+$input-bg:                 $color-surface-container-low;
+$input-border-color:       $color-outline-variant;
+$input-color:              $color-on-surface;
+$input-focus-border-color: $color-primary-container;
+$input-placeholder-color:  $color-on-surface-variant;
+
+// Code
+$code-color: $color-tertiary;
+$pre-color:  $color-on-surface;
+
+// Navbar
+$navbar-dark-color:        rgba($color-on-surface, 0.85);
+$navbar-dark-hover-color:  $color-primary;
+$navbar-dark-active-color: $color-primary;
+
+// =============================================================================
+// Bootstrap Import
+// =============================================================================
+
+@import '~bootstrap/scss/bootstrap';
+
+// =============================================================================
+// CSS Custom Properties — Full Design Token Set
+// =============================================================================
+
+:root {
+  // Surface
+  --color-surface:                   #{$color-surface};
+  --color-surface-dim:               #{$color-surface-dim};
+  --color-surface-bright:            #{$color-surface-bright};
+  --color-surface-container-lowest:  #{$color-surface-container-lowest};
+  --color-surface-container-low:     #{$color-surface-container-low};
+  --color-surface-container:         #{$color-surface-container};
+  --color-surface-container-high:    #{$color-surface-container-high};
+  --color-surface-container-highest: #{$color-surface-container-highest};
+  --color-on-surface:                #{$color-on-surface};
+  --color-on-surface-variant:        #{$color-on-surface-variant};
+  --color-inverse-surface:           #{$color-inverse-surface};
+  --color-inverse-on-surface:        #{$color-inverse-on-surface};
+  --color-outline:                   #{$color-outline};
+  --color-outline-variant:           #{$color-outline-variant};
+  --color-surface-tint:              #{$color-surface-tint};
+  --color-surface-variant:           #{$color-surface-variant};
+
+  // Primary
+  --color-primary:              #{$color-primary};
+  --color-on-primary:           #{$color-on-primary};
+  --color-primary-container:    #{$color-primary-container};
+  --color-on-primary-container: #{$color-on-primary-container};
+  --color-inverse-primary:      #{$color-inverse-primary};
+
+  // Secondary
+  --color-secondary:              #{$color-secondary};
+  --color-on-secondary:           #{$color-on-secondary};
+  --color-secondary-container:    #{$color-secondary-container};
+  --color-on-secondary-container: #{$color-on-secondary-container};
+
+  // Tertiary
+  --color-tertiary:              #{$color-tertiary};
+  --color-on-tertiary:           #{$color-on-tertiary};
+  --color-tertiary-container:    #{$color-tertiary-container};
+  --color-on-tertiary-container: #{$color-on-tertiary-container};
+
+  // Error
+  --color-error:              #{$color-error};
+  --color-on-error:           #{$color-on-error};
+  --color-error-container:    #{$color-error-container};
+  --color-on-error-container: #{$color-on-error-container};
+
+  // Background
+  --color-background:    #{$color-background};
+  --color-on-background: #{$color-on-background};
+
+  // Font stacks
+  --font-display: #{$font-display};
+  --font-body:    #{$font-body};
+  --font-mono:    #{$font-mono};
+
+  // Spacing scale (4px baseline)
+  --spacing-xs: 4px;
+  --spacing-sm: 8px;
+  --spacing-md: 16px;
+  --spacing-lg: 24px;
+  --spacing-xl: 32px;
+
+  // Border radius
+  --radius-sm:   #{$radius-sm};
+  --radius:      #{$radius-default};
+  --radius-md:   #{$radius-md};
+  --radius-lg:   #{$radius-lg};
+  --radius-xl:   #{$radius-xl};
+  --radius-full: #{$radius-full};
+
+  // Elevation: glow-only focus/hover effect
+  --glow-primary: 0 0 0 3px rgba(80, 167, 250, 0.2);
+}
+
+// =============================================================================
+// Base Styles
+// =============================================================================
+
+body {
+  background-color: var(--color-background);
+  color: var(--color-on-surface);
+  font-family: var(--font-body);
+}
+
+h1, h2, h3, h4, h5, h6 {
+  font-family: var(--font-display);
+}
+
+code, kbd, pre, samp {
+  font-family: var(--font-mono);
+}
+
+// =============================================================================
+// Typography Utility Classes
+// =============================================================================
+
+.text-display-lg {
+  font-family: var(--font-display);
+  font-size: 48px;
+  font-weight: 700;
+  line-height: 1.1;
+  letter-spacing: -0.02em;
+
+  @media (max-width: 768px) {
+    font-size: 32px;
+    line-height: 1.2;
+  }
+}
+
+.text-headline-md {
+  font-family: var(--font-display);
+  font-size: 24px;
+  font-weight: 600;
+  line-height: 1.3;
+}
+
+.text-body-lg {
+  font-family: var(--font-body);
+  font-size: 18px;
+  line-height: 1.6;
+}
+
+.text-body-md {
+  font-family: var(--font-body);
+  font-size: 16px;
+  line-height: 1.5;
+}
+
+.text-code-sm {
+  font-family: var(--font-mono);
+  font-size: 14px;
+  line-height: 1.5;
+}
+
+.text-label-caps {
+  font-family: var(--font-mono);
+  font-size: 12px;
+  font-weight: 600;
+  line-height: 1;
+  letter-spacing: 0.05em;
+  text-transform: uppercase;
+}
+
+// =============================================================================
+// Component Overrides
+// =============================================================================
+
+// Buttons — glow on interactive states
+.btn-primary {
+  color: $color-on-primary-container;
+
+  &:hover,
+  &:focus-visible {
+    box-shadow: var(--glow-primary);
+  }
+}
+
+.btn-outline-primary {
+  &:hover,
+  &:focus-visible {
+    box-shadow: var(--glow-primary);
+  }
+}
+
+// Cards — tonal layering, no shadows
+.card {
+  box-shadow: none;
+
+  .card-title {
+    font-family: var(--font-display);
+  }
+}
+
+// Inputs — glow on focus (already wired via $input-focus-border-color)
+.form-control,
+.form-select {
+  &:focus {
+    box-shadow: var(--glow-primary);
+  }
+}
+
+// Tech chips — JetBrains Mono, muted azure fill
+.badge-tech {
+  font-family: var(--font-mono);
+  font-size: 12px;
+  font-weight: 600;
+  letter-spacing: 0.05em;
+  text-transform: uppercase;
+  border-radius: var(--radius);
+  padding: 4px 8px;
+  background-color: rgba(80, 167, 250, 0.1);
+  color: var(--color-primary-container);
+  border: 1px solid rgba(80, 167, 250, 0.2);
+}
+
+// Code blocks — darkest surface, language label top-right
+pre {
+  position: relative;
+  background-color: var(--color-surface-container-lowest);
+  border: 1px solid var(--color-outline-variant);
+
+  code {
+    font-family: var(--font-mono);
+    font-size: 14px;
+  }
+
+  .code-lang {
+    position: absolute;
+    top: var(--spacing-sm);
+    right: var(--spacing-md);
+    font-family: var(--font-mono);
+    font-size: 12px;
+    font-weight: 600;
+    letter-spacing: 0.05em;
+    text-transform: uppercase;
+    color: var(--color-on-surface-variant);
+  }
+}
+
+// Interactive glow helper
+.interactive-glow {
+  transition: box-shadow 0.2s ease;
+
+  &:hover,
+  &:focus {
+    box-shadow: var(--glow-primary);
+  }
 }
diff --git a/package.json b/package.json
index d46d7db..1a9f60d 100644
--- a/package.json
+++ b/package.json
@@ -20,5 +20,9 @@
         "dev": "encore dev",
         "watch": "encore dev --watch",
         "build": "encore production --progress"
+    },
+    "dependencies": {
+        "@popperjs/core": "^2.11.8",
+        "bootstrap": "^5.3.8"
     }
 }
diff --git a/yarn.lock b/yarn.lock
index 9c2a965..c35acc6 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -972,6 +972,11 @@
     "@parcel/watcher-win32-ia32" "2.5.6"
     "@parcel/watcher-win32-x64" "2.5.6"
 
+"@popperjs/core@^2.11.8":
+  version "2.11.8"
+  resolved "https://registry.yarnpkg.com/@popperjs/core/-/core-2.11.8.tgz#6b79032e760a0899cd4204710beede972a3a185f"
+  integrity sha512-P1st0aksCrn9sGZhp8GMYwBnQsbvAWsZAX44oXNNvLHGqAOcoVxmjZiohstwQ7SqKnbR47akdNi+uleWD8+g6A==
+
 "@sinclair/typebox@^0.34.0":
   version "0.34.49"
   resolved "https://registry.yarnpkg.com/@sinclair/typebox/-/typebox-0.34.49.tgz#4f1369234f2ecf693866476c3b2e1b54d2a9d68e"
@@ -1323,6 +1328,11 @@ boolbase@^1.0.0:
   resolved "https://registry.yarnpkg.com/boolbase/-/boolbase-1.0.0.tgz#68dff5fbe60c51eb37725ea9e3ed310dcc1e776e"
   integrity sha512-JZOSA7Mo9sNGB8+UjSgzdLtokWAky1zbztM3WRLCbZ70/3cTANmQmOdR7y2g+J0e2WXywy1yS468tY+IruqEww==
 
+bootstrap@^5.3.8:
+  version "5.3.8"
+  resolved "https://registry.yarnpkg.com/bootstrap/-/bootstrap-5.3.8.tgz#6401a10057a22752d21f4e19055508980656aeed"
+  integrity sha512-HP1SZDqaLDPwsNiqRqi5NcP0SSXciX2s9E+RyqJIIqGo+vJeN5AJVM98CXmW/Wux0nQ5L7jeWUdplCEf0Ee+tg==
+
 brace-expansion@^1.1.7:
   version "1.1.15"
   resolved "https://registry.yarnpkg.com/brace-expansion/-/brace-expansion-1.1.15.tgz#a6d90d54067236e5f42570a3b7378d594d9b7738"