Complete 3.2.1: Advanced Breakpoint Management - Implemented comprehensive breakpoint system with CSS custom properties, established 6 mobile-first breakpoints, and modernized responsive utilities.

UI_UPDATE.MD

@@ -279,27 +279,48 @@ Always come back and update UI_UPDATE.MD once complete with task and task item.
 
 ### Sub-task 3.1: Grid-Based Layout System
 
-#### 3.1.1: CSS Grid Implementation
-- [ ] Analyze current flexbox usage
-- [ ] Identify CSS Grid opportunities
-- [ ] Implement grid-based layout foundation
+#### 3.1.1: CSS Grid Implementation - COMPLETED 9/29/2025
+- [x] Analyze current flexbox usage
+- [x] Identify CSS Grid opportunities
+- [x] Implement grid-based layout foundation
 
-#### 3.1.2: 12-Column System
-- [ ] Create responsive grid variation classes
-- [ ] Implement grid gap and spacing system
-- [ ] Add grid utility classes for common patterns
+**Notes:** Added comprehensive CSS Grid utility classes to utilities.css including grid template columns, spanning utilities, alignment classes, and auto-fit/auto-fill responsive grids. The current flexbox implementation was analyzed and determined that main layout structures (theater-container, video-section) are appropriately using flexbox for their use cases. Grid utilities provide foundation for future responsive layouts and component arrangements.
 
-#### 3.1.3: Layout Utilities
-- [ ] Create container and wrapper utilities
-- [ ] Implement spacing and alignment helpers
-- [ ] Add responsive layout modifiers
+#### 3.1.2: 12-Column System - COMPLETED 9/29/2025
+- [x] Create responsive grid variation classes
+- [x] Implement grid gap and spacing system
+- [x] Add grid utility classes for common patterns
+
+**Notes:** Implemented comprehensive 12-column CSS Grid system in utilities.css with:
+- Expanded grid column spans (col-span-5 through col-span-12)
+- Added col-start-* and col-end-* utilities for precise column positioning
+- Implemented responsive grid classes (.sm\:grid-cols-*, .md\:grid-cols-*, etc.) for all breakpoints
+- Enhanced gap system with gap-*, gap-x-*, and gap-y-* utilities
+- Added grid-flow utilities and additional alignment classes
+- Created responsive grid variation classes for sm (640px+), md (768px+), lg (1024px+), xl (1280px+), and 2xl (1536px+) breakpoints
+
+#### 3.1.3: Layout Utilities - COMPLETED 9/29/2025
+- [x] Create container and wrapper utilities
+- [x] Implement spacing and alignment helpers
+- [x] Add responsive layout modifiers
+
+**Notes:** Implemented comprehensive layout utilities to utilities.css with over 190 utility classes including:
+- Container utilities (.container, .container-fluid, .wrapper, breakpoint-specific containers)
+- Complete spacing system (margin/padding utilities: .m-*, .p-*, directional and axis helpers)
+- Display and positioning utilities (.block, .flex, .relative, .absolute, etc.)
+- Width/height utilities (.w-*, .h-*, fractional widths)
+- Border and text alignment utilities
+- Flexbox utilities (direction, wrap, justify, align, flex-items)
+- Responsive layout modifiers across all breakpoints (sm:, md:, lg:, xl:, 2xl:)
 
 ### Sub-task 3.2: Advanced Breakpoint Management
 
-#### 3.2.1: Breakpoint Definition
-- [ ] Establish 6 responsive breakpoints (xs to 2xl)
-- [ ] Create breakpoint mixin system
-- [ ] Implement breakpoint-based CSS variables
+#### 3.2.1: Breakpoint Definition - COMPLETED 9/29/2025
+- [x] Establish 6 responsive breakpoints (xs to 2xl)
+- [x] Create breakpoint mixin system
+- [x] Implement breakpoint-based CSS variables
+
+**Notes:** Implemented comprehensive breakpoint system using CSS custom properties. Established 6 mobile-first breakpoints (xs: 320px, sm: 640px, md: 768px, lg: 1024px, xl: 1280px, 2xl: 1536px) in variables.css. Created breakpoint mixin system with custom property utilities (--mq-sm, --mq-md, etc.) and implemented all utility classes using var(--breakpoint-sm) in media queries across utilities.css. Added container max-widths and responsive padding variables for each breakpoint. Modernized all existing responsive utilities to use the new system, including grid, display, text alignment, and dimension utilities.
 
 #### 3.2.2: Responsive Typography
 - [ ] Create fluid typography scaling

static/css/variables.css

@@ -245,24 +245,57 @@
     --elevation-6: var(--shadow-dodgers-xl);
 
     /* =================================================================
-       BREAKPOINT VARIABLES
+       BREAKPOINT VARIABLES - Comprehensive Responsive System
        ================================================================= */
 
-    /* Mobile-first breakpoints */
-    --breakpoint-xs: 320px;
-    --breakpoint-sm: 640px;
-    --breakpoint-md: 768px;
-    --breakpoint-lg: 1024px;
-    --breakpoint-xl: 1280px;
-    --breakpoint-2xl: 1536px;
+    /* Mobile-first breakpoints (includes xs where content starts) */
+    --breakpoint-xs: 320px;    /* Extra small devices (320px and up) */
+    --breakpoint-sm: 640px;    /* Small devices (640px and up) */
+    --breakpoint-md: 768px;    /* Medium devices (768px and up) */
+    --breakpoint-lg: 1024px;   /* Large devices (1024px and up) */
+    --breakpoint-xl: 1280px;   /* Extra large devices (1280px and up) */
+    --breakpoint-2xl: 1536px;  /* 2X large devices (1536px and up) */
 
-    /* Media query mixins (these will be used in component CSS) */
-    /* xs: 0px and up */
-    /* sm: 640px and up */
-    /* md: 768px and up */
-    /* lg: 1024px and up */
-    /* xl: 1280px and up */
-    /* 2xl: 1536px and up */
+    /* Container max-widths at each breakpoint */
+    --container-xs: 320px;
+    --container-sm: 640px;
+    --container-md: 768px;
+    --container-lg: 1024px;
+    --container-xl: 1280px;
+    --container-2xl: 1536px;
+
+    /* Content padding that scales with breakpoints */
+    --container-padding-xs: var(--spacing-2);
+    --container-padding-sm: var(--spacing-4);
+    --container-padding-md: var(--spacing-6);
+    --container-padding-lg: var(--spacing-8);
+    --container-padding-xl: var(--spacing-10);
+    --container-padding-2xl: var(--spacing-12);
+
+    /* =================================================================
+       BREAKPOINT MIXIN SYSTEM & UTILITIES
+       ================================================================= */
+
+    /* Media query helpers using custom properties */
+    --mq-xs: (min-width: var(--breakpoint-xs));
+    --mq-sm: (min-width: var(--breakpoint-sm));
+    --mq-md: (min-width: var(--breakpoint-md));
+    --mq-lg: (min-width: var(--breakpoint-lg));
+    --mq-xl: (min-width: var(--breakpoint-xl));
+    --mq-2xl: (min-width: var(--breakpoint-2xl));
+
+    /* Max-width media queries for desktop-first approach */
+    --mq-xs-max: (max-width: calc(var(--breakpoint-sm) - 1px));
+    --mq-sm-max: (max-width: calc(var(--breakpoint-md) - 1px));
+    --mq-md-max: (max-width: calc(var(--breakpoint-lg) - 1px));
+    --mq-lg-max: (max-width: calc(var(--breakpoint-xl) - 1px));
+    --mq-xl-max: (max-width: calc(var(--breakpoint-2xl) - 1px));
+
+    /* Combined breakpoint utilities */
+    --mq-sm-only: (min-width: var(--breakpoint-sm)) and (max-width: calc(var(--breakpoint-md) - 1px));
+    --mq-md-only: (min-width: var(--breakpoint-md)) and (max-width: calc(var(--breakpoint-lg) - 1px));
+    --mq-lg-only: (min-width: var(--breakpoint-lg)) and (max-width: calc(var(--breakpoint-xl) - 1px));
+    --mq-xl-only: (min-width: var(--breakpoint-xl)) and (max-width: calc(var(--breakpoint-2xl) - 1px));
 
     /* =================================================================
        Z-INDEX SCALE