feat(requirements): add tagline with blinking cursor

- Add "i'm lovin' IT" tagline below McDonald's ASCII logo
- Implement blinking cursor animation after tagline
- Update layout structure in CLAUDE.md
- Add detailed tagline requirements in project-spec.md
- Specify CSS animation for cursor blink (1s interval)
- Update Step 2.1 to include tagline implementation

New visual element: centered tagline with terminal-style cursor.

project-spec.md

@@ -14,6 +14,7 @@ Single-page website for McDonald's IT department Halloween event announcement, f
 
 ### FR-2: Visual Branding
 - ASCII art McDonald's logo as primary visual element
+- Tagline "i'm lovin' IT" centered below logo with blinking cursor
 - Terminal/command-line aesthetic throughout
 - Maintain brand recognition while adhering to geek style
 
@@ -70,6 +71,8 @@ Single-page website for McDonald's IT department Halloween event announcement, f
 |         [ASCII LOGO]             |
 |         McDonald's               |
 |                                  |
+|      i'm lovin' IT_              |
+|                                  |
 |    🎃 Halloween Event            |
 |                                  |
 |    Date: [TBD]                   |
@@ -82,6 +85,9 @@ Single-page website for McDonald's IT department Halloween event announcement, f
 |    • Spooky Debugging Challenge  |
 |                                  |
 +----------------------------------+
+
+Note: The underscore (_) after "IT" represents 
+a blinking cursor animation (CSS keyframes)
 ```
 
 ### ASCII Art Requirements
@@ -91,6 +97,13 @@ Single-page website for McDonald's IT department Halloween event announcement, f
 - Uses only standard ASCII characters
 - Maintains McDonald's brand recognition
 
+### Tagline Requirements
+- Text: "i'm lovin' IT" (lowercase, with apostrophe)
+- Position: Centered, one line below ASCII logo
+- Blinking cursor: Underscore character after "IT"
+- Animation: CSS @keyframes for cursor blink (1s interval)
+- Style: Same monospace font, terminal green color
+
 ## Content Requirements
 
 ### Event Details
@@ -117,6 +130,7 @@ Single-page website for McDonald's IT department Halloween event announcement, f
 - No image files (ASCII art only)
 - No web fonts (system fonts only)
 - No backend/server-side code required
+- CSS animations allowed (for blinking cursor effect)
 
 ## Success Criteria
 
@@ -125,7 +139,8 @@ Single-page website for McDonald's IT department Halloween event announcement, f
 3. Passes HTML5 validation
 4. Achieves WCAG 2.1 AA contrast ratios
 5. Works without JavaScript enabled
-6. Receives positive feedback from IT staff
+6. Blinking cursor animation works smoothly
+7. Receives positive feedback from IT staff
 
 ## Out of Scope