Change CSS framework from PicoCSS to Bootstrap 5.3

assets/bs/darkly/_bootswatch.scss

@@ -0,0 +1,78 @@
+// Darkly 5.3.8
+// Bootswatch
+
+
+// Variables
+
+$web-font-path: "https://fonts.googleapis.com/css2?family=Lato:ital,wght@0,400;0,700;1,400&display=swap" !default;
+@if $web-font-path {
+  @import url("#{$web-font-path}");
+}
+
+// Typography
+
+.blockquote {
+  &-footer {
+    color: $gray-600;
+  }
+}
+
+.text-secondary {
+  color: var(--bs-secondary-color) !important;
+}
+
+// Forms
+
+@include color-mode(dark) {
+  .input-group-text {
+    // color: $white;
+  }
+}
+
+.form-floating {
+  > label,
+  > .form-control:focus ~ label,
+  > .form-control:not(:placeholder-shown) ~ label {
+    color: $input-placeholder-color;
+  }
+}
+
+// Navs
+
+.breadcrumb a {
+  color: $white;
+}
+
+.pagination {
+  a:hover {
+    text-decoration: none;
+  }
+}
+
+// Indicators
+
+.alert {
+  color: $white;
+  border: none;
+
+  a,
+  .alert-link {
+    color: $white;
+    text-decoration: underline;
+  }
+
+  @each $color, $value in $theme-colors {
+    &-#{$color} {
+      @if $enable-gradients {
+        background: $value linear-gradient(180deg, mix($white, $value, 15%), $value) repeat-x;
+      } @else {
+        background-color: $value;
+      }
+    }
+  }
+}
+
+.tooltip {
+  --bs-tooltip-bg: var(--bs-tertiary-bg);
+  --bs-tooltip-color: var(--bs-emphasis-color);
+}

assets/bs/darkly/_variables.scss

@@ -0,0 +1,184 @@
+// Darkly 5.3.8
+// Bootswatch
+
+$theme: "darkly" !default;
+
+//
+// Color system
+//
+
+$white:    #fff !default;
+$gray-100: #f8f9fa !default;
+$gray-200: #ebebeb !default;
+$gray-300: #dee2e6 !default;
+$gray-400: #ced4da !default;
+$gray-500: #adb5bd !default;
+$gray-600: #888 !default;
+$gray-700: #444 !default;
+$gray-800: #303030 !default;
+$gray-900: #222 !default;
+$black:    #000 !default;
+
+$blue:    #375a7f !default;
+$indigo:  #6610f2 !default;
+$purple:  #6f42c1 !default;
+$pink:    #e83e8c !default;
+$red:     #e74c3c !default;
+$orange:  #fd7e14 !default;
+$yellow:  #f39c12 !default;
+$green:   #00bc8c !default;
+$teal:    #20c997 !default;
+$cyan:    #3498db !default;
+
+$primary:       $blue !default;
+$secondary:     $gray-700 !default;
+$success:       $green !default;
+$info:          $cyan !default;
+$warning:       $yellow !default;
+$danger:        $red !default;
+$light:         $gray-500 !default;
+$dark:          $gray-800 !default;
+
+$min-contrast-ratio:   1.9 !default;
+
+// Body
+
+$body-bg:                   $gray-900 !default;
+$body-color:                $white !default;
+
+// Links
+
+$link-color:                $success !default;
+
+// Fonts
+
+// stylelint-disable-next-line value-keyword-case
+$font-family-sans-serif:      Lato, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol" !default;
+$h1-font-size:                3rem !default;
+$h2-font-size:                2.5rem !default;
+$h3-font-size:                2rem !default;
+$text-muted:                  $gray-600 !default;
+
+// Tables
+
+$table-color:                 initial !default;
+
+$table-border-color:          $gray-700 !default;
+
+$table-bg-scale:              0% !default;
+
+// Forms
+
+$input-bg:                          $white !default;
+$input-color:                       $gray-800 !default;
+$input-border-color:                $body-bg !default;
+$input-group-addon-color:           $gray-500 !default;
+$input-group-addon-bg:              $gray-700 !default;
+$input-placeholder-color:           $gray-600 !default;
+
+$form-check-input-bg:                     $white !default;
+$form-check-input-border:                 none !default;
+
+$form-select-disabled-color:        $gray-600 !default;
+
+$form-file-button-color:          $input-group-addon-color !default;
+$form-file-button-bg:             $input-group-addon-bg !default;
+$form-file-button-hover-bg:       darken($form-file-button-bg, 5%) !default;
+
+// Dropdowns
+
+$dropdown-bg:                       $gray-900 !default;
+$dropdown-border-color:             $gray-700 !default;
+$dropdown-divider-bg:               $gray-700 !default;
+$dropdown-link-color:               $white !default;
+$dropdown-link-hover-color:         $white !default;
+$dropdown-link-hover-bg:            $primary !default;
+
+// Navs
+
+$nav-link-padding-x:                2rem !default;
+$nav-link-color:                    $white !default;
+$nav-link-hover-color:              $white !default;
+$nav-link-disabled-color:           $gray-600 !default;
+$nav-tabs-border-color:             $gray-700 !default;
+$nav-tabs-link-hover-border-color:  $nav-tabs-border-color $nav-tabs-border-color transparent !default;
+$nav-tabs-link-active-color:        $white !default;
+$nav-tabs-link-active-border-color: $nav-tabs-border-color $nav-tabs-border-color transparent !default;
+
+$nav-underline-link-active-color:   $white !default;
+
+// Navbar
+
+$navbar-padding-y:                  1rem !default;
+$navbar-dark-color:                rgba($white, .6) !default;
+$navbar-dark-hover-color:          $white !default;
+$navbar-light-color:                rgba($gray-900, .7) !default;
+$navbar-light-hover-color:          $gray-900 !default;
+$navbar-light-active-color:         $gray-900 !default;
+$navbar-light-toggler-border-color: rgba($gray-900, .1) !default;
+
+// Pagination
+
+$pagination-color:                  $white !default;
+$pagination-bg:                     $success !default;
+$pagination-border-width:           0 !default;
+$pagination-border-color:           transparent !default;
+$pagination-hover-color:            $white !default;
+$pagination-hover-bg:               lighten($success, 10%) !default;
+$pagination-hover-border-color:     transparent !default;
+$pagination-active-bg:              $pagination-hover-bg !default;
+$pagination-active-border-color:    transparent !default;
+$pagination-disabled-color:         $white !default;
+$pagination-disabled-bg:            darken($success, 15%) !default;
+$pagination-disabled-border-color:  transparent !default;
+
+// Cards
+
+$card-cap-bg:                       $gray-700 !default;
+$card-bg:                           $gray-800 !default;
+
+// Popovers
+
+$popover-bg:                        $gray-800 !default;
+$popover-header-bg:                 $gray-700 !default;
+
+// Toasts
+
+$toast-background-color:            $gray-700 !default;
+$toast-header-background-color:     $gray-800 !default;
+
+// Modals
+
+$modal-content-bg:                  $gray-800 !default;
+$modal-content-border-color:        $gray-700 !default;
+$modal-header-border-color:         $gray-700 !default;
+
+// Progress bars
+
+$progress-bg:                       $gray-700 !default;
+
+// List group
+
+$list-group-color:                  $body-color !default;
+$list-group-bg:                     $gray-800 !default;
+$list-group-border-color:           $gray-700 !default;
+$list-group-hover-bg:               $gray-700 !default;
+$list-group-action-hover-color:     $list-group-color !default;
+$list-group-action-active-bg:       $gray-900 !default;
+
+// Breadcrumbs
+
+$breadcrumb-padding-y:              .375rem !default;
+$breadcrumb-padding-x:              .75rem !default;
+$breadcrumb-bg:                     $gray-700 !default;
+$breadcrumb-border-radius:          .25rem !default;
+
+// Close
+
+$btn-close-color:            $white !default;
+$btn-close-opacity:          .4 !default;
+$btn-close-hover-opacity:    1 !default;
+
+// Code
+
+$pre-color:                         inherit !default;