PHONE-SM AND PHONE-LG BREAKPOINTS - MIGRATION GUIDE
Date: 2024-12-30

SUMMARY
    New granular phone breakpoints added to the responsive system. The existing
    `phone` breakpoint (0-799px) remains as a composite covering all phones,
    similar to how `mobile` covers all non-desktop sizes. Two new breakpoints
    provide finer control:

        phone-sm    0 - 399px       Small phones, compact screens
        phone-lg    400 - 799px     Large phones, phablets

    This mirrors the desktop pattern where `desktop` is the composite and
    `desktop-sm`, `desktop-md`, `desktop-lg`, `desktop-xl` provide granularity.

BREAKPOINT SUMMARY (UPDATED)

    Tier 1 - Semantic:
        mobile      0 - 1023px      Phone + tablet combined
        desktop     1024px+         All desktop sizes

    Tier 2 - Granular:
        phone       0 - 799px       All phones (composite)
        phone-sm    0 - 399px       Small phones, compact screens
        phone-lg    400 - 799px     Large phones, phablets
        tablet      800 - 1023px    Tablets portrait
        desktop-sm  1024 - 1199px   Laptops, small monitors
        desktop-md  1200 - 1639px   Standard monitors (1080p)
        desktop-lg  1640 - 2199px   Large monitors (1440p)
        desktop-xl  2200px+         Ultra-wide monitors, 4K

    Breakpoints: 400, 800, 1024, 1200, 1640, 2200

AFFECTED FILES

    Framework files (already updated):
        rsx/theme/variables.scss    New $bp-phone-lg variable, updated $grid-breakpoints
        rsx/theme/responsive.scss   New mixins: phone-sm, phone-lg, phone-lg-up

    Application files requiring migration:
        rsx/theme/variables.scss    Add $bp-phone-lg, update $grid-breakpoints
        rsx/theme/responsive.scss   Add new mixins

CHANGES REQUIRED

    1. Update variables.scss
       -------------------------------------------------------------------------
       Add the new breakpoint variable and update $grid-breakpoints.

       Add after existing breakpoint comments:

       $bp-phone-lg: 400px;
       $bp-tablet: 800px;
       $bp-desktop: 1024px;
       $bp-desktop-md: 1200px;
       $bp-desktop-lg: 1640px;
       $bp-desktop-xl: 2200px;

       Update $grid-breakpoints to include phone-sm and phone-lg:

       $grid-breakpoints: (
           xs: 0,
           mobile: 0,
           phone: 0,
           phone-sm: 0,
           phone-lg: 400px,
           tablet: 800px,
           desktop: 1024px,
           desktop-sm: 1024px,
           desktop-md: 1200px,
           desktop-lg: 1640px,
           desktop-xl: 2200px
       );

    2. Update responsive.scss
       -------------------------------------------------------------------------
       Add the new mixins after the existing @mixin phone definition:

       @mixin phone-sm {
           @media (max-width: #{$bp-phone-lg - 0.02px}) {
               @content;
           }
       }

       @mixin phone-lg {
           @media (min-width: $bp-phone-lg) and (max-width: #{$bp-tablet - 0.02px}) {
               @content;
           }
       }

       Add in the "and up" mixins section:

       @mixin phone-lg-up {
           @media (min-width: $bp-phone-lg) {
               @content;
           }
       }

       Update CSS custom properties in :root:

       :root {
           --bp-phone-lg: #{$bp-phone-lg};     // 400px
           --bp-tablet: #{$bp-tablet};         // 800px
           --bp-desktop: #{$bp-desktop};       // 1024px
           --bp-desktop-md: #{$bp-desktop-md}; // 1200px
           --bp-desktop-lg: #{$bp-desktop-lg}; // 1640px
           --bp-desktop-xl: #{$bp-desktop-xl}; // 2200px
       }

NEW CLASSES AVAILABLE

    Bootstrap utility classes are auto-generated from $grid-breakpoints:

        .col-phone-sm-12        Full width on small phones
        .col-phone-lg-6         Half width on large phones
        .d-phone-sm-none        Hide on small phones
        .d-phone-lg-block       Show as block on large phones
        .p-phone-sm-2           Padding 2 on small phones
        .m-phone-lg-3           Margin 3 on large phones

USAGE EXAMPLES

    Different layouts for small vs large phones:

        .my-component {
            // Default (all sizes)
            font-size: 16px;

            @include phone-sm {
                // Compact layout for small phones
                font-size: 14px;
                padding: 8px;
            }

            @include phone-lg {
                // More spacious for larger phones
                font-size: 15px;
                padding: 12px;
            }
        }

    Responsive grid with phone granularity:

        <div class="row">
            <div class="col-phone-sm-12 col-phone-lg-6 col-tablet-4 col-desktop-3">
                Card
            </div>
        </div>

    Hide element on small phones only:

        <div class="d-phone-sm-none">
            This content is hidden on small phones (< 400px)
        </div>

VERIFICATION

    1. Compile bundles and verify no SCSS errors:
       php artisan rsx:bundle:compile Frontend_Bundle

    2. Test the new breakpoints:
       - Resize browser to < 400px, verify phone-sm styles apply
       - Resize browser to 400-799px, verify phone-lg styles apply
       - Verify phone (composite) still works for 0-799px range

    3. Test Bootstrap classes:
       - Add class="col-phone-sm-12 col-phone-lg-6" to element
       - Verify layout changes at 400px breakpoint

REFERENCE

    php artisan rsx:man responsive   - Full responsive system documentation