first part of new theme integration

app/javascript/stylesheets/custom/components/_accordions.scss

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+// 
+// accordions.scss
+//
+
+.custom-accordion {
+
+    .card {
+        box-shadow: none;
+    }
+
+    .card-header {
+        background-color: $gray-100;
+    }
+
+    .card-body {
+        border: 1px solid $gray-100;
+    }
+
+    .accordion-arrow {
+        font-size: 1.2rem;
+        position: absolute;
+        right: 0;
+    }
+    a {
+        &.collapsed {
+            i.accordion-arrow {
+                &:before {
+                    content: "\F142";
+                }
+            }
+        }
+    }
+}
+
+.custom-accordion-title {
+    color: $custom-accordion-title-color;
+    position: relative;
+
+    &:hover {
+        color: lighten($custom-accordion-title-color,7.5%)
+    }
+}
+
+.accordion {
+    >.card {
+        >.card-header {
+            border-radius: 0;
+            margin-bottom: -1px;
+        }
+    }
+}

app/javascript/stylesheets/custom/components/_dropdown.scss

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+// 
+// dropdown.scss
+//
+
+.dropdown-menu {
+    box-shadow: $box-shadow;
+}
+
+.dropdown-menu-animated {
+    &.dropdown-menu-end[style] {
+        left: auto!important;
+        right: 0!important;
+    }
+}
+
+// Dropdown Animated (Custom)
+.dropdown-menu-animated {
+    animation-name: DropDownSlide;
+    animation-duration: .3s;
+    animation-fill-mode: both;
+    position: absolute;
+    margin: 0;
+    z-index: 1000;
+    
+    &.show {
+        top: 100%!important;
+    }
+
+    i {
+        display: inline-block;
+    }
+    
+    &.dropdown-menu[data-popper-placement^=right],
+    &.dropdown-menu[data-popper-placement^=top],
+    &.dropdown-menu[data-popper-placement^=left]{
+        top: auto !important;
+        animation: none !important;
+    }
+}
+
+@keyframes DropDownSlide {
+    100% {
+        transform: translateY(0)
+    }
+    0% {
+        transform: translateY(10px)
+    }
+}
+
+
+// Dropdown Large (Custom)
+@media (min-width: 600px) {
+    .dropdown-lg {
+        width: $dropdown-lg-width;
+    }
+}
+
+// Dropdown with Icons
+.dropdown-icon-item {
+    display: block;
+    border-radius: 3px;
+    line-height: 34px;
+    text-align: center;
+    padding: 15px 0 9px;
+    display: block;
+    border: 1px solid transparent;
+    color: $dropdown-link-color;
+
+    img {
+        height: 24px;
+    }
+
+    span {
+        display: block;
+        overflow: hidden;
+        text-overflow: ellipsis;
+        white-space: nowrap;
+    }
+
+    &:hover {
+        background-color: $dropdown-link-hover-bg;
+        color: $dropdown-link-hover-color;
+    }
+}
+
+
+// Dropdown arrow hide
+.arrow-none {
+    &:after {
+        display: none;
+    }
+}

app/javascript/stylesheets/custom/components/_mixins.scss

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+// 
+// mixins.scss
+//
+
+// Components
+@import "mixins/background-variant";
+@import "mixins/buttons";
+@import "mixins/badge";

app/javascript/stylesheets/custom/components/_nav.scss

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+// 
+// tabs.scss
+//
+
+.nav-tabs,.nav-pills {
+    > li {
+        > a {
+            color: $gray-700;
+            font-weight: $font-weight-semibold;
+        }
+    }
+}
+
+.nav-pills {
+    > a {
+        color: $gray-700;
+        font-weight: $font-weight-semibold;   
+    }
+}
+
+
+.bg-nav-pills {
+    background-color: $nav-pills-bg;
+}
+
+// 
+// nav-bordered
+//
+
+.nav-tabs.nav-bordered {
+    border-bottom: 2px solid rgba($gray-600, 0.2);
+
+    .nav-item {
+        margin-bottom: -1px;
+    }
+
+    li {
+        a {
+            border: 0;
+            padding: 0.625rem 1.25rem;
+        }
+        a.active {
+            border-bottom: 2px solid $primary;
+        }
+    }
+}

app/javascript/stylesheets/custom/components/mixins/_background-variant.scss

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+// Background lighten 
+
+@mixin bg-variant-light($color) {
+    background-color: rgba($color, 0.25) !important;
+}

app/javascript/stylesheets/custom/components/mixins/_badge.scss

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+
+// Lighten badge
+@mixin badge-variant-light($bg) {
+  color: $bg;
+  background-color: rgba($bg, 0.18);
+}
+
+// Outline badge
+
+@mixin badge-variant-outline($bg) {
+  color: $bg;
+  border: 1px solid $bg;
+  background-color: transparent;
+}

app/javascript/stylesheets/custom/components/mixins/_buttons.scss

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+// Button shadow
+
+@mixin button-shadow($color) {
+    box-shadow: $btn-box-shadow rgba($color, 0.5);
+}