UX: add fadeout to topic list on large vp

* Changing the category & tag dropdown back into their original form.
The breadcrumb idea isn't working well.

| BC | AC |
|--------|--------|
| ![CleanShot 2025-06-09 at 18 59
37@2x](https://github.com/user-attachments/assets/cbeb3aaf-ad0e-4085-8548-58ea0a521c95)
| ![CleanShot 2025-06-09 at 18 57
33@2x](https://github.com/user-attachments/assets/15db752b-4983-4b7f-b6f8-9a8ded9e6f9f)
|

* Alignment fix in chat navbar drawer

| BC | AC |
|--------|--------|
| ![CleanShot 2025-06-09 at 18 59
18@2x](https://github.com/user-attachments/assets/38c7dcee-dc77-4a44-ae8d-5ecb7910536b)
| ![CleanShot 2025-06-09 at 18 58
36@2x](https://github.com/user-attachments/assets/be699f88-4e5e-4d8c-ab4d-f6d1eca93037)
|

.discourse-compatibility

@@ -0,0 +1,2 @@
+< 3.5.0.beta5-dev: 31249c4f27d93e83c6b83d42d93974522a9a612e
+

Gemfile.lock

@@ -1,8 +1,9 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activesupport (7.2.1.1)
+    activesupport (8.0.2)
       base64
+      benchmark (>= 0.3)
       bigdecimal
       concurrent-ruby (~> 1.0, >= 1.3.1)
       connection_pool (>= 2.2.5)
@@ -12,68 +13,83 @@ GEM
       minitest (>= 5.1)
       securerandom (>= 0.3)
       tzinfo (~> 2.0, >= 2.0.5)
-    ast (2.4.2)
-    base64 (0.2.0)
-    bigdecimal (3.1.8)
-    concurrent-ruby (1.3.4)
-    connection_pool (2.4.1)
-    drb (2.2.1)
-    i18n (1.14.6)
+      uri (>= 0.13.1)
+    ast (2.4.3)
+    base64 (0.3.0)
+    benchmark (0.4.1)
+    bigdecimal (3.2.2)
+    concurrent-ruby (1.3.5)
+    connection_pool (2.5.3)
+    drb (2.2.3)
+    i18n (1.14.7)
       concurrent-ruby (~> 1.0)
-    json (2.7.2)
-    language_server-protocol (3.17.0.3)
-    logger (1.6.1)
-    minitest (5.25.1)
-    parallel (1.26.3)
-    parser (3.3.5.0)
+    json (2.12.2)
+    language_server-protocol (3.17.0.5)
+    lint_roller (1.1.0)
+    logger (1.7.0)
+    minitest (5.25.5)
+    parallel (1.27.0)
+    parser (3.3.8.0)
       ast (~> 2.4.1)
       racc
     prettier_print (1.2.1)
+    prism (1.4.0)
     racc (1.8.1)
-    rack (3.1.10)
+    rack (3.1.15)
     rainbow (3.1.1)
-    regexp_parser (2.9.2)
-    rubocop (1.67.0)
+    regexp_parser (2.10.0)
+    rubocop (1.76.0)
       json (~> 2.3)
-      language_server-protocol (>= 3.17.0)
+      language_server-protocol (~> 3.17.0.2)
+      lint_roller (~> 1.1.0)
       parallel (~> 1.10)
       parser (>= 3.3.0.2)
       rainbow (>= 2.2.2, < 4.0)
-      regexp_parser (>= 2.4, < 3.0)
-      rubocop-ast (>= 1.32.2, < 2.0)
+      regexp_parser (>= 2.9.3, < 3.0)
+      rubocop-ast (>= 1.45.0, < 2.0)
       ruby-progressbar (~> 1.7)
-      unicode-display_width (>= 2.4.0, < 3.0)
-    rubocop-ast (1.32.3)
-      parser (>= 3.3.1.0)
-    rubocop-capybara (2.21.0)
-      rubocop (~> 1.41)
-    rubocop-discourse (3.8.2)
+      unicode-display_width (>= 2.4.0, < 4.0)
+    rubocop-ast (1.45.0)
+      parser (>= 3.3.7.2)
+      prism (~> 1.4)
+    rubocop-capybara (2.22.1)
+      lint_roller (~> 1.1)
+      rubocop (~> 1.72, >= 1.72.1)
+    rubocop-discourse (3.12.1)
       activesupport (>= 6.1)
-      rubocop (>= 1.59.0)
-      rubocop-capybara (>= 2.0.0)
-      rubocop-factory_bot (>= 2.0.0)
-      rubocop-rails (>= 2.25.0)
+      lint_roller (>= 1.1.0)
+      rubocop (>= 1.73.2)
+      rubocop-capybara (>= 2.22.0)
+      rubocop-factory_bot (>= 2.27.0)
+      rubocop-rails (>= 2.30.3)
       rubocop-rspec (>= 3.0.1)
-      rubocop-rspec_rails (>= 2.30.0)
-    rubocop-factory_bot (2.26.1)
-      rubocop (~> 1.61)
-    rubocop-rails (2.26.2)
+      rubocop-rspec_rails (>= 2.31.0)
+    rubocop-factory_bot (2.27.1)
+      lint_roller (~> 1.1)
+      rubocop (~> 1.72, >= 1.72.1)
+    rubocop-rails (2.32.0)
       activesupport (>= 4.2.0)
+      lint_roller (~> 1.1)
       rack (>= 1.1)
-      rubocop (>= 1.52.0, < 2.0)
-      rubocop-ast (>= 1.31.1, < 2.0)
-    rubocop-rspec (3.1.0)
-      rubocop (~> 1.61)
-    rubocop-rspec_rails (2.30.0)
-      rubocop (~> 1.61)
-      rubocop-rspec (~> 3, >= 3.0.1)
+      rubocop (>= 1.75.0, < 2.0)
+      rubocop-ast (>= 1.44.0, < 2.0)
+    rubocop-rspec (3.6.0)
+      lint_roller (~> 1.1)
+      rubocop (~> 1.72, >= 1.72.1)
+    rubocop-rspec_rails (2.31.0)
+      lint_roller (~> 1.1)
+      rubocop (~> 1.72, >= 1.72.1)
+      rubocop-rspec (~> 3.5)
     ruby-progressbar (1.13.0)
-    securerandom (0.3.1)
+    securerandom (0.4.1)
     syntax_tree (6.2.0)
       prettier_print (>= 1.2.0)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
-    unicode-display_width (2.6.0)
+    unicode-display_width (3.1.4)
+      unicode-emoji (~> 4.0, >= 4.0.4)
+    unicode-emoji (4.0.4)
+    uri (1.0.3)
 
 PLATFORMS
   ruby
@@ -83,4 +99,4 @@ DEPENDENCIES
   syntax_tree
 
 BUNDLED WITH
-   2.5.21
+   2.6.9

about.json

@@ -130,5 +130,6 @@
       "header_primary": "ffffff",
       "hover": "584B3E"
     }
-  }
+  },
+  "screenshots": ["screenshots/light.png", "screenshots/dark.png"]
 }

common/color_definitions.scss

@@ -1,6 +1,7 @@
 html {
   --accent-color: #{$tertiary} !important;
-  --accent-text-color: #ffffff;
+  --accent-text-color: #fff;
+
   // Background Colors
   --background-color: light-dark(
     oklch(from #{$tertiary} 96% calc(c * 0.125) h),
@@ -10,6 +11,7 @@ html {
     oklch(from #{$secondary} calc(2 * l) c h),
     oklch(from #{$secondary} l c h)
   ) !important;
+
   // HeaderColors
   --header_primary-low-mid: light-dark(
     oklch(from #{$tertiary} 73.5% calc(c * 0.5) h),
@@ -40,17 +42,14 @@ html {
     oklch(from #{$tertiary} 92% calc(c * 0.5) h),
     oklch(from #{$tertiary} calc(l * 0.7) calc(c * 0.25) h)
   ) !important;
-
   --d-nav-color--active: light-dark(
     oklch(from #{$tertiary} l c h),
     oklch(from #{$tertiary} calc(l * 1.2) c h)
   ) !important;
-
   --d-nav-color--hover: light-dark(
     oklch(from #{$tertiary} l c h),
     oklch(from #{$tertiary} calc(l * 1.2) c h)
   ) !important;
-
   --link-color: light-dark(
     oklch(from #{$tertiary} l c h),
     oklch(from #{$tertiary} calc(l * 0.95) c h)
@@ -78,7 +77,6 @@ html {
     oklch(from #{$tertiary} calc(l * 1.5) calc(c * 0.35) h),
     oklch(from #{$tertiary} calc(l * 0.75) calc(c * 0.5) h)
   ) !important;
-
   --d-sidebar-highlight-hover-icon: var(--d-sidebar-link-color) !important;
   --d-sidebar-highlight-hover-background: var(--d-selected) !important;
   --d-sidebar-link-icon-color: var(--d-sidebar-link-color) !important;

common/head_tag.html

@@ -1,6 +1,7 @@
 <script>
-  if(!CSS.supports("(color: hsl(from white h s l))")){
+  if (!CSS.supports("(color: hsl(from white h s l))")) {
     window.unsupportedBrowser = true;
-    window.I18n.translations[I18n.locale].js.browser_update = 'The Horizon theme does not support your browser. Please update your browser, or <a href="?safe_mode=no_themes">switch to safe mode</a>.';
+    window.I18n.translations[I18n.locale].js.browser_update =
+      'The Horizon theme does not support your browser. Please update your browser, or <a href="?safe_mode=no_themes">switch to safe mode</a>.';
   }
-</script>
+</script>

javascripts/discourse/api-initializers/hamburger-click-outside-transformer.js

@@ -0,0 +1,10 @@
+import { apiInitializer } from "discourse/lib/api";
+
+export default apiInitializer("0.8", (api) => {
+  api.registerValueTransformer(
+    "hamburger-dropdown-click-outside-exceptions",
+    ({ value }) => {
+      return [...value, ".topic-drafts-menu-content"];
+    }
+  );
+});

javascripts/discourse/components/card/topic-activity-column.gjs

@@ -1,9 +1,7 @@
 import Component from "@glimmer/component";
-import avatar from "discourse/helpers/avatar";
 import concatClass from "discourse/helpers/concat-class";
 import icon from "discourse/helpers/d-icon";
 import formatDate from "discourse/helpers/format-date";
-import { i18n } from "discourse-i18n";
 
 export default class TopicActivityColumn extends Component {
   get topicUser() {
@@ -27,37 +25,34 @@ export default class TopicActivityColumn extends Component {
       };
     } else if (this.args.topic.posts_count === 1) {
       return {
-        user: this.args.topic.creator,
-        username: this.args.topic.creator.username,
-        activityText: "user_posted",
-        class: "--posted",
+        user: this.args.topic.firstPosterUser,
+        username: this.args.topic.last_poster_username,
+        class: "--created",
       };
+    } else {
+      return;
     }
   }
 
   <template>
     <span class={{concatClass "topic-activity" this.topicUser.class}}>
-      <div class="topic-activity__user">
+      <div class="topic-activity__type">
         {{#if this.topicUser.user}}
-          {{avatar this.topicUser.user imageSize="small"}}
+          {{icon "reply"}}
         {{else}}
           {{icon "pencil"}}
         {{/if}}
       </div>
+
       {{#if this.topicUser.username}}
         <span
           class="topic-activity__username"
         >{{this.topicUser.username}}</span>
+        <span class="dot-separator"></span>
       {{/if}}
-      <div class="topic-activity__reason">
-        {{i18n (themePrefix this.topicUser.activityText)}}
-      </div>
+
       <div class="topic-activity__time">
-        {{formatDate
-          @topic.bumpedAt
-          leaveAgo="true"
-          format="medium-with-ago-and-on"
-        }}
+        {{formatDate @topic.bumpedAt leaveAgo="true" format="tiny"}}
       </div>
     </span>
   </template>

javascripts/discourse/components/card/topic-creator-column.gjs

@@ -0,0 +1,19 @@
+import Component from "@glimmer/component";
+import avatar from "discourse/helpers/avatar";
+
+export default class TopicCreatorColumn extends Component {
+  get topicCreator() {
+    return {
+      user: this.args.topic.creator,
+      username: this.args.topic.creator.username,
+      class: "--topic-creator",
+    };
+  }
+
+  <template>
+    <div class={{this.topicUser.class}}>
+      {{avatar this.topicCreator.user}}
+      <span class="topic-creator__username">{{this.topicUser.username}}</span>
+    </div>
+  </template>
+}

javascripts/discourse/components/card/topic-replies-column.gjs

@@ -1,5 +1,5 @@
+import { gt } from "truth-helpers";
 import icon from "discourse/helpers/d-icon";
-import gt from "truth-helpers/helpers/gt";
 
 const TopicRepliesColumn = <template>
   {{#if (gt @topic.replyCount 1)}}

javascripts/discourse/components/experimental-screen.gjs

@@ -10,6 +10,7 @@ const DO_NOT_RENDER_LIST = ["login"];
 
 export default class ExperimentalScreen extends Component {
   @service router;
+
   @tracked left = 0;
   @tracked right = 0;
   resizeObserver;

javascripts/discourse/components/sidebar-new-topic-button.gjs

@@ -3,16 +3,18 @@ import { tracked } from "@glimmer/tracking";
 import { action } from "@ember/object";
 import didInsert from "@ember/render-modifiers/modifiers/did-insert";
 import didUpdate from "@ember/render-modifiers/modifiers/did-update";
+import willDestroy from "@ember/render-modifiers/modifiers/will-destroy";
 import { service } from "@ember/service";
-import { gt } from "truth-helpers";
+import { gt, not } from "truth-helpers";
 import CreateTopicButton from "discourse/components/create-topic-button";
-import not from "truth-helpers/helpers/not";
 
 export default class SidebarNewTopicButton extends Component {
   @service composer;
   @service currentUser;
   @service siteSettings;
   @service router;
+  @service header;
+  @service appEvents;
 
   @tracked category;
   @tracked tag;
@@ -74,12 +76,30 @@ export default class SidebarNewTopicButton extends Component {
     this.tag = this.router.currentRoute.attributes?.tag || null;
   }
 
+  @action
+  watchForComposer() {
+    // this covers opening drafts from the hamburger menu
+    this.appEvents.on("composer:will-open", this, this.closeHamburger);
+  }
+
+  @action
+  stopWatchingForComposer() {
+    this.appEvents.off("composer:will-open", this, this.closeHamburger);
+  }
+
+  @action
+  closeHamburger() {
+    this.header.hamburgerVisible = false;
+  }
+
   <template>
     {{#if this.shouldRender}}
       <div
         class="sidebar-new-topic-button__wrapper"
         {{didInsert this.getCategoryandTag}}
         {{didUpdate this.getCategoryandTag this.router.currentRoute}}
+        {{didInsert this.watchForComposer}}
+        {{willDestroy this.stopWatchingForComposer}}
       >
         <CreateTopicButton
           @canCreateTopic={{this.canCreateTopic}}

javascripts/discourse/components/user-color-palette-selector.gjs

@@ -31,13 +31,14 @@ export default class UserColorPaletteSelector extends Component {
   @service site;
   @service session;
   @service interfaceColor;
+
   @tracked anonColorPaletteId = this.#loadAnonColorPalette();
   @tracked userColorPaletteId = this.session.userColorSchemeId;
   @tracked cssLoaded = true;
 
   get userColorPalettes() {
     const availablePalettes = listColorSchemes(this.site)
-      .map((userPalette) => {
+      ?.map((userPalette) => {
         return {
           ...userPalette,
           accent: `#${
@@ -55,7 +56,7 @@ export default class UserColorPaletteSelector extends Component {
     // Match the light scheme with the corresponding dark id based in the name
     return (
       availablePalettes
-        .map((palette) => {
+        ?.map((palette) => {
           if (palette.is_dark) {
             return palette;
           }

javascripts/discourse/initializers/topic-list-columns.gjs

@@ -1,6 +1,7 @@
 import { withPluginApi } from "discourse/lib/plugin-api";
 import TopicActivityColumn from "../components/card/topic-activity-column";
 import TopicCategoryColumn from "../components/card/topic-category-column";
+import TopicCreatorColumn from "../components/card/topic-creator-column";
 import TopicLikesColumn from "../components/card/topic-likes-column";
 import TopicRepliesColumn from "../components/card/topic-replies-column";
 import TopicStatusColumn from "../components/card/topic-status-column";
@@ -30,6 +31,12 @@ const TopicLikesReplies = <template>
   </td>
 </template>;
 
+const TopicCreator = <template>
+  <td class="topic-creator-data">
+    <TopicCreatorColumn @topic={{@topic}} />
+  </td>
+</template>;
+
 export default {
   name: "topic-list-customizations",
 
@@ -52,6 +59,10 @@ export default {
             item: TopicLikesReplies,
             after: "topic-author-avatar",
           });
+          columns.add("topic-creator", {
+            item: TopicCreator,
+            after: "topic-author-avatar",
+          });
           columns.delete("views");
           columns.delete("replies");
           if (!router.currentRouteName.includes("userPrivateMessages")) {
@@ -83,6 +94,34 @@ export default {
       api.registerValueTransformer("topic-list-item-mobile-layout", () => {
         return false;
       });
+
+      api.registerBehaviorTransformer(
+        "topic-list-item-click",
+        ({ context: { event }, next }) => {
+          if (event.target.closest("a, button, input")) {
+            return next();
+          }
+
+          event.preventDefault();
+          event.stopPropagation();
+
+          const topicLink = event.target
+            .closest("tr")
+            .querySelector("a.raw-topic-link");
+
+          // Redespatch the click on the topic link, so that all key-handing is sorted
+          topicLink.dispatchEvent(
+            new MouseEvent("click", {
+              ctrlKey: event.ctrlKey,
+              metaKey: event.metaKey,
+              shiftKey: event.shiftKey,
+              button: event.button,
+              bubbles: true,
+              cancelable: true,
+            })
+          );
+        }
+      );
     });
   },
 };

locales/en.yml

@@ -6,4 +6,3 @@ en:
   user_replied: "replied"
   user_posted: "posted"
   user_updated: "updated"
-

package.json

@@ -1,13 +1,14 @@
 {
   "private": true,
   "devDependencies": {
-    "@discourse/lint-configs": "2.4.0",
-    "ember-template-lint": "6.1.0",
-    "eslint": "9.19.0",
-    "prettier": "2.8.8"
+    "@discourse/lint-configs": "2.25.0",
+    "ember-template-lint": "7.8.1",
+    "eslint": "9.28.0",
+    "prettier": "3.5.3",
+    "stylelint": "16.20.0"
   },
   "engines": {
-    "node": ">= 18",
+    "node": ">= 22",
     "npm": "please-use-pnpm",
     "yarn": "please-use-pnpm",
     "pnpm": "9.x"

scss/box-view.scss

@@ -1,4 +1,6 @@
-@media screen and (min-width: 1300px) {
+@use "lib/viewport";
+
+@media screen and (width >= 1300px) {
   #main-outlet {
     border-top-right-radius: var(--d-border-radius-large);
     border-top-left-radius: var(--d-border-radius-large);
@@ -19,40 +21,46 @@
 
 .has-full-page-chat .chat-replying-indicator-container {
   margin-bottom: var(--main-grid-gap);
-  @include breakpoint(medium) {
+
+  @include viewport.until(lg) {
     margin-bottom: 0;
   }
 }
 
 .has-full-page-chat .chat-selection-management {
   margin-bottom: var(--main-grid-gap);
-  @include breakpoint(medium) {
+
+  @include viewport.until(lg) {
     margin-bottom: 0;
   }
 }
 
 .experimental-screen {
-  @include breakpoint(medium) {
-    display: none;
-  }
   max-width: unset !important;
   width: 100%;
   display: block;
   margin: 0;
   padding: 0;
   position: relative;
-  container: content-width / inline-size;
-  @media screen and (max-width: 488px) {
+
+  @include viewport.until(lg) {
     display: none;
   }
-  @include breakpoint(tablet) {
+
+  @media screen and (width <= 488px) {
     display: none;
   }
+
+  @include viewport.until(md) {
+    display: none;
+  }
+
   li {
     list-style: none;
     margin: 0;
     padding: 0;
   }
+
   &__top-left,
   &__top-right,
   &__bottom-left,
@@ -68,38 +76,39 @@
       transparent var(--d-border-radius-large),
       black var(--d-border-radius-large)
     );
-    -webkit-mask: radial-gradient(
-      circle at var(--d-border-radius-large) var(--d-border-radius-large),
-      transparent var(--d-border-radius-large),
-      transparent var(--d-border-radius-large),
-      black var(--d-border-radius-large)
-    );
   }
+
   &__top-left {
     top: var(--header-offset);
     left: var(--left-distance);
   }
+
   &__top-right {
     top: var(--header-offset);
     transform: rotate(90deg);
     left: calc(var(--right-distance) - var(--d-border-radius-large));
   }
+
   &__bottom-left {
     transform: rotate(-90deg);
     bottom: var(--main-grid-gap);
     left: var(--left-distance);
-    @media screen and (max-width: 768px) {
+
+    @media screen and (width <= 768px) {
       bottom: calc(var(--d-border-radius-large) * 2);
     }
   }
+
   &__bottom-right {
     transform: rotate(180deg);
     bottom: var(--main-grid-gap);
     left: calc(var(--right-distance) - var(--d-border-radius-large));
-    @media screen and (max-width: 768px) {
+
+    @media screen and (width <= 768px) {
       bottom: calc(var(--d-border-radius-large) * 2);
     }
   }
+
   &__bottom-bar {
     position: fixed;
     width: 100%;
@@ -108,16 +117,48 @@
     bottom: 0;
     left: var(--left-distance);
     height: var(--main-grid-gap);
-    @media screen and (max-width: 768px) {
+
+    @media screen and (width <= 768px) {
       height: calc(var(--d-border-radius-large) * 2);
     }
+
     @container content-width (width > 1px) {
       width: 100cqw;
     }
   }
 }
 
-@media screen and (min-width: 768px) {
+.rtl .experimental-screen {
+  &__top-left {
+    right: var(--left-distance);
+    left: unset;
+  }
+
+  &__top-right {
+    transform: rotate(-90deg) !important;
+    right: calc(var(--right-distance) - var(--d-border-radius-large));
+    left: unset;
+  }
+
+  &__bottom-left {
+    transform: rotate(90deg);
+    right: var(--left-distance);
+    left: unset;
+  }
+
+  &__bottom-right {
+    transform: rotate(180deg);
+    left: unset;
+    right: calc(var(--right-distance) - var(--d-border-radius-large));
+  }
+
+  &__bottom-bar {
+    right: var(--left-distance);
+    left: unset;
+  }
+}
+
+@media screen and (width >= 768px) {
   .with-topic-progress {
     bottom: calc(
       env(safe-area-inset-bottom) + var(--composer-height, 0px) +
@@ -126,7 +167,7 @@
   }
 }
 
-@media screen and (max-width: 768px) {
+@media screen and (width <= 768px) {
   .with-topic-progress {
     bottom: calc(
       env(safe-area-inset-bottom) + var(--composer-height, 0px) +
@@ -135,7 +176,7 @@
   }
 }
 
-@media screen and (max-width: 400px) {
+@media screen and (width <= 400px) {
   .with-topic-progress {
     bottom: calc(env(safe-area-inset-bottom) + var(--composer-height, 0px));
   }

scss/buttons.scss

@@ -8,11 +8,13 @@
 
 .sidebar-new-topic-button__wrapper .topic-drafts-menu-trigger.btn.no-text {
   background: var(--accent-color);
+
   &:hover,
   &:focus-visible {
     background: oklch(from var(--accent-color) 40% c h) !important;
     box-shadow: none;
   }
+
   .d-icon {
     color: var(--accent-text-color);
   }
@@ -26,31 +28,37 @@
 .discourse-no-touch .btn-default,
 .discourse-no-touch .select-kit .select-kit-header.btn-default {
   background: var(--primary-100);
+
   .d-icon {
     color: var(--accent-color);
   }
 
   &:hover {
     border-color: transparent;
-    box-shadow: 0px 0px 8px 1px var(--button-box-shadow);
+    box-shadow: 0 0 8px 1px var(--button-box-shadow);
     background: var(--d-content-background);
     color: var(--accent-color);
+
     .d-icon {
       color: var(--accent-color);
     }
   }
+
   &:focus-visible {
     background: var(--d-content-background);
     color: var(--accent-color);
-    box-shadow: 0px 0px 0px 3px var(--button-box-shadow);
+    box-shadow: 0 0 0 3px var(--button-box-shadow);
+
     .d-icon {
       color: var(--accent-color);
     }
   }
+
   &:active:not(:hover, :focus) {
     color: var(--primary);
     background: var(--tertiary-300);
     background-image: none;
+
     .d-icon {
       color: var(--tertiary-high);
     }
@@ -58,35 +66,41 @@
 }
 
 .btn-primary,
-#create-topic.btn {
+#create-topic.btn,
+.discourse-no-touch .btn-default.ai-new-question-button {
   background-color: var(--accent-color);
   color: var(--accent-text-color);
+
   .d-icon {
     color: var(--accent-text-color);
   }
+
   &:hover {
     .discourse-no-touch & {
       background: light-dark(
         oklch(from var(--accent-color) 40% c h),
         oklch(from var(--accent-color) 50% c h)
       );
-      box-shadow: 0px 0px 6px 1px var(--button-box-shadow);
+      box-shadow: 0 0 6px 1px var(--button-box-shadow);
       color: var(--accent-text-color);
+
       .d-icon {
         color: var(--accent-text-color);
       }
     }
   }
+
   &:focus-visible {
     .discourse-no-touch & {
       background: light-dark(
         oklch(from var(--accent-color) 40% c h),
         oklch(from var(--accent-color) 50% c h)
       );
-      box-shadow: 0px 0px 0px 4px var(--button-box-shadow);
+      box-shadow: 0 0 0 4px var(--button-box-shadow);
       color: var(--accent-text-color);
     }
   }
+
   &:active {
     background: light-dark(
       oklch(from var(--accent-color) 40% c h),

scss/chat.scss

@@ -1,9 +1,13 @@
+@use "lib/viewport";
+
 .full-page-chat.full-page-chat-sidebar-enabled {
   border: none;
 }
 
 .c-navbar-container {
-  padding: 0 1.5em;
+  .full-page-chat & {
+    padding: 0 1.5em;
+  }
   background-color: var(--d-content-background);
 }
 
@@ -13,21 +17,43 @@ body.has-full-page-chat {
 
 .chat-drawer-container {
   .is-expanded & {
-    box-shadow: 0px 0px 0px 2px var(--tertiary-medium);
+    box-shadow: 0 0 0 2px var(--tertiary-medium);
   }
+
   .chat-drawer.is-expanded & {
     border: none;
   }
+
+  .c-navbar__title {
+    padding-left: 0.33em; // visual alignment for chat index, which does not havea a backarrow
+  }
 }
 
 .chat-drawer-outlet-container {
   z-index: z("composer", "content");
+
+  .peek-mode-active & {
+    padding-bottom: 0;
+    left: unset;
+    right: var(--main-grid-gap);
+
+    &:has(.is-expanded) {
+      z-index: calc(z("composer", "dropdown") + 1);
+    }
+  }
+}
+
+.chat-drawer {
+  .peek-mode-active & {
+    max-width: 90vw;
+  }
 }
 
 .chat-drawer .channels-list-container .chat-channel-row {
   margin-bottom: var(--spacing-block-xs);
   font-size: var(--font-up-1);
   border-bottom: none;
+
   &:hover {
     background-color: var(--d-sidebar-active-background);
   }
@@ -52,5 +78,11 @@ body.has-full-page-chat {
 }
 
 .chat-drawer-active.chat-drawer-expanded .chat-composer-dropdown__menu-content {
-  z-index: z("composer", "content") + 1;
+  z-index: z("modal", "dialog");
+}
+
+.chat-replying-indicator-container {
+  @include viewport.from(sm) {
+    margin-left: calc(0.65em + 0.2rem);
+  }
 }

scss/color-choice.scss

@@ -4,17 +4,21 @@
     width: 100%;
     justify-content: flex-start;
   }
+
   &__item .btn-icon-text.btn-flat:hover {
     background-color: var(--d-selected);
     box-shadow: none;
     color: var(--primary);
   }
+
   &__item .btn-icon-text.btn-flat:hover svg {
     color: var(--icon-color);
   }
+
   &__item .btn-icon-text.btn-flat svg {
     color: var(--icon-color);
   }
+
   &__item-choice.active.btn-icon-text.btn-flat {
     background-color: var(--d-selected);
   }

scss/color-exploration.scss

@@ -6,7 +6,7 @@
   --d-sidebar-header-icon-color: var(--d-sidebar-link-color);
   --d-sidebar-active-suffix-color: var(--d-sidebar-suffix-color);
   --d-sidebar-background: var(--background-color);
-  --d-sidebar-footer-fade: rgba(var(--tertiary-50-rgb), 1);
+  --d-sidebar-footer-fade: rgb(var(--tertiary-50-rgb), 1);
   --d-sidebar-prefix-background: var(--d-selected);
   --d-sidebar-active-prefix-background: light-dark(
     oklch(from var(--d-selected) calc(l * 0.85) c h),

scss/composer-peek-mode.scss

@@ -2,7 +2,7 @@
   display: none;
 }
 
-@media screen and (min-width: 1300px) {
+@media screen and (width >= 1300px) {
   html:not(.fullscreen-composer) {
     .peek-mode-toggle svg {
       transform: scaleX(-1);
@@ -18,6 +18,7 @@
           transition: none;
           box-shadow: none;
           border-radius: var(--d-border-radius-large);
+
           .grippie {
             display: none;
           }

scss/composer.scss

@@ -1,8 +1,11 @@
+@use "lib/viewport";
+
 #reply-control
   .select-kit.dropdown-select-box.composer-actions
   .select-kit-header {
   border: 1px solid var(--tertiary-700);
   background: var(--secondary);
+
   &:hover {
     .d-icon {
       color: var(--accent-color);
@@ -11,14 +14,15 @@
 }
 
 #reply-control.hide-preview:not(.draft) {
-  @include breakpoint("mobile-extra-large", $rule: min-width) {
+  @include viewport.from(sm) {
     background: var(--d-content-background);
-
     border-top-right-radius: var(--d-border-radius);
     border-top-left-radius: var(--d-border-radius);
 
     .grippie {
       background: var(--tertiary-low);
+      border-top-right-radius: var(--d-border-radius);
+      border-top-left-radius: var(--d-border-radius);
     }
 
     .user-selector,
@@ -43,6 +47,7 @@
     .reply-area {
       padding-inline: 0;
     }
+
     .reply-to,
     .submit-panel {
       padding-inline: var(--spacing-inline-sm);
@@ -59,6 +64,7 @@
     }
   }
 }
+
 .d-editor-button-bar {
   .btn:hover,
   .toolbar-popup-menu-options.is-expanded {
@@ -70,11 +76,12 @@
         color: inherit;
       }
 
-      //to have parity with regular select-kit styling used elsewhere
+      // to have parity with regular select-kit styling used elsewhere
       .select-kit-row {
         .d-icon {
           color: var(--primary-high);
         }
+
         &:hover {
           .d-icon {
             color: var(--primary);
@@ -88,3 +95,27 @@
     border-radius: var(--d-border-radius);
   }
 }
+
+.discourse-no-touch .translation-selector-dropdown {
+  .select-kit-header.btn-default {
+    background: var(--background-color);
+  }
+}
+
+#reply-control.composer-action-add_translation {
+  .d-editor-preview .d-editor-translation-preview-wrapper {
+    border-color: var(--d-sidebar-border-color);
+  }
+
+  .d-editor-preview .d-editor-translation-preview-wrapper__header {
+    top: 6.5rem;
+    padding: 0.25rem 0.75rem;
+    background: var(--background-color);
+    color: var(--accent-color);
+    border-radius: var(--d-border-radius-large);
+  }
+
+  .topic-title-translator input {
+    width: 47.25vw;
+  }
+}

scss/desktop-full-width.scss

@@ -1,3 +1,5 @@
+@use "lib/viewport";
+
 // Full width layout. Ported from the Discourse Full Width theme component here
 // https://meta.discourse.org/t/discourse-full-width-component/292496, which we
 // intend to move into core over time.
@@ -13,12 +15,31 @@ $sidebar-width: 17em;
 }
 
 .d-header #site-logo {
-  // constraining the logo to fit its grid container
   // this prevents the logo from shifting header content
   // when the sidebar is opened
   max-height: 100%;
   max-width: 100%;
   object-fit: contain; // contains logo without squishing/stretching
+
+  // allows some flexibility for wide logos
+  body:not(.has-sidebar-page) & {
+    max-width: unset;
+
+    @include viewport.until(sm) {
+      max-width: 25vw;
+    }
+  }
+}
+
+.d-header #site-text-logo {
+  font-size: clamp(var(--font-0), 2.5vw, var(--font-up-2));
+
+  .has-sidebar-page & {
+    white-space: wrap;
+    line-height: var(--line-height-medium);
+
+    @include line-clamp(2);
+  }
 }
 
 #main-outlet-wrapper {
@@ -84,7 +105,7 @@ $sidebar-width: 17em;
         grid-area: extra-info;
         white-space: nowrap;
 
-        @include breakpoint("tablet") {
+        @include viewport.until(md) {
           display: none;
         }
       }
@@ -108,7 +129,7 @@ $sidebar-width: 17em;
         // at narrower widths, when 1fr = 0
         // we can center without matching the sidebar's width
         // which allows the title to take up the remaining width
-        @media screen and (max-width: 1400px) {
+        @media screen and (width <= 1400px) {
           grid-template-columns:
             calc(var(--d-sidebar-width) - 11px)
             1fr
@@ -117,7 +138,7 @@ $sidebar-width: 17em;
             auto;
         }
 
-        @media screen and (max-width: 1000px) {
+        @media screen and (width <= 1000px) {
           gap: 0.5em;
         }
 
@@ -138,7 +159,7 @@ $sidebar-width: 17em;
 
   .d-header-mode {
     .bootstrap-mode {
-      margin: 0;
+      display: none;
     }
   }
 
@@ -150,7 +171,7 @@ $sidebar-width: 17em;
     overflow: visible;
 
     .title {
-      flex: 1 0 auto;
+      flex: 1 1 auto;
     }
   }
 
@@ -170,11 +191,11 @@ $sidebar-width: 17em;
 .header-search--enabled .floating-search-input-wrapper {
   grid-area: extra-info;
 
-  @include breakpoint(tablet) {
+  @include viewport.until(md) {
     grid-area: rspace;
   }
 
-  @include breakpoint(mobile-extra-large) {
+  @include viewport.until(sm) {
     display: none;
   }
 }
@@ -189,7 +210,7 @@ body.has-sidebar-page {
     padding: 0;
   }
 
-  @media screen and (min-width: calc($reply-area-max-width + ($sidebar-width * 2))) {
+  @media screen and (width >= calc($reply-area-max-width + ($sidebar-width * 2))) {
     #reply-control.show-preview {
       margin-left: auto;
       margin-right: auto;
@@ -200,7 +221,7 @@ body.has-sidebar-page {
     }
   }
 
-  @media screen and (max-width: calc($reply-area-max-width + ($sidebar-width * 2))) and (min-width: calc($reply-area-max-width + calc($sidebar-width / 2))) {
+  @media screen and (width <= calc($reply-area-max-width + ($sidebar-width * 2))) and (width >= calc($reply-area-max-width + calc($sidebar-width / 2))) {
     #reply-control.show-preview:not(.fullscreen) {
       margin-left: $sidebar-width;
       width: auto;
@@ -246,7 +267,7 @@ body.sidebar-animate {
 }
 
 // provides some extra space for login buttons
-@media screen and (min-width: 1400px) {
+@media screen and (width >= 1400px) {
   .anon {
     .d-header .panel {
       grid-column-start: -4;

scss/desktop-horizon-fixes.scss

@@ -1,10 +1,10 @@
 // Fixing bulk select (only needed for desktop)
-
 .bulk-select-enabled {
-  .topic-list-header .topic-list-data.default {
-    position: sticky;
-    top: 10em;
+  .topic-list-header {
+    position: relative;
+    top: 0;
   }
+
   .topic-author-avatar-data {
     display: none;
   }
@@ -13,8 +13,9 @@
     grid-area: bulk-select;
     margin-left: -0.5em;
 
-    @media screen and (max-width: 576px) {
+    @media screen and (width <= 576px) {
       margin-top: 0;
+
       label {
         padding-block: 0.345em;
       }
@@ -39,8 +40,6 @@
     }
 
     &.default {
-      position: absolute;
-      right: 0;
       .bulk-select,
       span:not(.bulk-select-topics, .d-button-label) {
         display: none;
@@ -48,18 +47,19 @@
     }
   }
 
+  // bulk select
   .bulk-select-topics {
     position: absolute;
     right: 0;
-    bottom: 0;
     background: var(--secondary);
     border-radius: 0 0 0 var(--d-border-radius);
-    padding: 1em;
-    @media screen and (max-width: 1048px) {
-      right: 0;
-    }
+    display: flex;
+    gap: 0.5rem;
+    margin: 0.5rem;
+
     button {
       white-space: nowrap;
+      margin: 0;
     }
   }
 }

scss/header.scss

@@ -1,7 +1,10 @@
+@use "lib/viewport";
+
 .d-header {
   box-shadow: none;
   background: var(--background-color);
-  @include breakpoint(extra-large, $rule: min-width) {
+
+  @include viewport.from(xl) {
     padding-bottom: var(--main-grid-gap);
   }
 }
@@ -48,8 +51,10 @@
 .discourse-no-touch .interface-color-selector-content {
   border: none;
   border-radius: var(--d-border-radius);
+
   .btn {
     border: none;
+
     &:hover {
       box-shadow: none;
     }
@@ -59,10 +64,6 @@
 .drop-down-mode .d-header-icons .active .icon,
 .drop-down-mode .d-header-icons .header-color-scheme-toggle .-expanded {
   border-color: transparent;
-}
-
-.drop-down-mode .d-header-icons .active .icon,
-.drop-down-mode .d-header-icons .header-color-scheme-toggle .-expanded {
   background-color: transparent;
 }
 

scss/hiddenstuff.scss

@@ -3,7 +3,7 @@
 .notifications-button-footer .reason .text,
 .pinned-button .reason .text,
 .more-topics__browse-more,
-//footer-message might cause issues, not sure what possible stuff can be in there, but the general idea is to hide it bcs having an ugly H3 (what?) CTA at the bottom is just… ugly imo
+// footer-message might cause issues, not sure what possible stuff can be in there, but the general idea is to hide it bcs having an ugly H3 (what?) CTA at the bottom is just… ugly imo
 .footer-message {
   display: none;
 }

scss/login.scss

@@ -6,6 +6,7 @@ body.static-login {
       "sidebar below-content";
     grid-template-rows: auto 1fr auto;
   }
+
   .login-welcome {
     border-radius: none;
     border: none;

scss/main.scss

@@ -1,3 +1,5 @@
+@use "lib/viewport";
+
 :root {
   --main-grid-gap: 0.5em;
 }
@@ -5,17 +7,19 @@
 html:not(:has(.has-full-page-chat)) {
   background-color: var(--background-color);
 
-  @include breakpoint("mobile-extra-large") {
+  @include viewport.until(sm) {
     background-color: var(--d-content-background);
   }
 }
 
 body {
   -webkit-font-smoothing: antialiased;
-  @include breakpoint("mobile-extra-large") {
+
+  @include viewport.until(sm) {
     background-color: var(--d-content-background);
   }
 }
+
 #main-outlet-wrapper {
   gap: var(--main-grid-gap);
 }
@@ -29,52 +33,61 @@ body.has-full-page-chat:not(.has-sidebar-page) {
   .d-header {
     background-color: var(--background-color);
   }
+
   #main-outlet-wrapper {
     gap: var(--main-grid-gap);
-    @include breakpoint(medium) {
+
+    @include viewport.until(lg) {
       gap: 0;
     }
   }
 }
 
 body.has-sidebar-page #main-outlet-wrapper {
-  grid-template-columns: var(--d-sidebar-width) minmax(0, 1fr) 0px;
+  grid-template-columns: var(--d-sidebar-width) minmax(0, 1fr) 0;
+
   #main-outlet {
     max-width: unset;
   }
 }
 
 body:not(.has-sidebar-page) #main-outlet-wrapper {
-  @include breakpoint(medium, $rule: min-width) {
-    grid-template-columns: 0px minmax(0, 1fr) 0px;
+  @include viewport.from(lg) {
+    grid-template-columns: 0 minmax(0, 1fr) 0;
   }
 }
 
-body:not(.has-full-page-chat) {
-  @include breakpoint(extra-large, $rule: min-width) {
+body:not(.has-full-page-chat, .wizard) {
+  @include viewport.from(xl) {
     background-color: var(--background-color);
   }
+
   #main-outlet-wrapper {
-    @include breakpoint(medium) {
+    @include viewport.until(lg) {
       --main-grid-gap: 0;
     }
-    @media screen and (min-width: 768px) {
+
+    @media screen and (width >= 768px) {
       gap: var(--main-grid-gap);
     }
+
     #main-outlet {
       width: 100%;
       max-width: unset;
       padding-bottom: var(--spacing-block-l);
       border-radius: var(--d-border-radius-large);
       background-color: var(--d-content-background);
-      @include breakpoint(medium) {
-        border-radius: 0px;
+
+      @include viewport.until(lg) {
+        border-radius: 0;
       }
+
       html.composer-open & {
         padding-bottom: var(--composer-height);
       }
+
       > *:not(.experimental-screen, .activate-account) {
-        @include breakpoint(medium, $rule: min-width) {
+        @include viewport.from(lg) {
           box-sizing: border-box;
           max-width: 1000px;
           margin-inline: auto;
@@ -87,7 +100,7 @@ body:not(.has-full-page-chat) {
 
 #list-area {
   .show-more.has-topics {
-    @include breakpoint(medium, $rule: min-width) {
+    @include viewport.from(lg) {
       width: auto;
       right: 50%;
       transform: translateX(50%);
@@ -99,6 +112,7 @@ body:not(.has-full-page-chat) {
       }
     }
   }
+
   .topic-list-body {
     padding-top: var(--spacing-block-m);
   }

scss/misc.scss

@@ -1,3 +1,5 @@
+@use "lib/viewport";
+
 .user-main .about.collapsed-info .details {
   background: var(--d-content-background);
 }
@@ -69,7 +71,7 @@ input[type="color"]:focus,
   background-color: var(--background-color);
 }
 
-@include breakpoint(mobile-extra-large) {
+@include viewport.until(sm) {
   // pinned topic excerpts are hidden on small screens too
   .fk-d-menu__trigger.topic-list-layout-trigger {
     display: none;
@@ -85,7 +87,7 @@ input[type="color"]:focus,
 
 .user-main .about .details {
   padding: 1em 1em 0;
-  border-bottom: 0px;
+  border-bottom: 0;
   border-radius: var(--d-border-radius);
   background-color: var(--primary-50);
 }
@@ -105,3 +107,35 @@ input[type="color"]:focus,
 .period-chooser-header {
   border-radius: 0;
 }
+
+// compatibility with the top contributors sidebar theme component
+// https://meta.discourse.org/t/top-contributors-sidebar/215110
+.list-container
+  #list-area
+  > .contents
+  > .topic-list:has(.discourse-top-contributors) {
+  grid-template-areas: "head head" "body sidebar";
+  grid-template-rows: auto 1fr;
+
+  @include viewport.until(lg) {
+    grid-template-areas: "head head" "body body";
+  }
+
+  tbody {
+    display: flex;
+  }
+
+  .discourse-top-contributors {
+    width: auto;
+    box-sizing: border-box;
+
+    @include viewport.until(lg) {
+      display: none;
+    }
+
+    .top-contributors-heading {
+      font-size: var(--font-up-2);
+      padding-bottom: 0.5em;
+    }
+  }
+}

scss/mobile-stuff.scss

@@ -1,77 +1,93 @@
-//temp sepeate file to avoid merge hell… to be distributed later
-@include breakpoint(medium) {
+@use "lib/viewport";
+
+// temp separate file to avoid merge hell… to be distributed later
+@include viewport.until(lg) {
   html,
   .d-header {
     background-color: var(--d-content-background);
   }
 }
+
 #main-outlet-wrapper {
   *[class*="navigation-"] & {
-    @include breakpoint(mobile-extra-large) {
+    @include viewport.until(sm) {
       padding: 0;
     }
   }
 }
+
 #main-outlet {
-  @include breakpoint(mobile-extra-large) {
+  @include viewport.until(sm) {
     padding-top: var(--spacing-block-sm);
   }
 
   .list-controls {
-    @include breakpoint(mobile-extra-large) {
+    @include viewport.until(sm) {
       padding-inline: var(
         --spacing-inline-m
-      ) !important; //override will be fixed when the whole chat page shenanigans is resolved
+      ) !important; // override will be fixed when the whole chat page shenanigans is resolved
       padding-block: var(--spacing-block-s);
       border-bottom: 1px solid var(--primary-200);
     }
+
     .navigation-container {
-      @include breakpoint(mobile-extra-large) {
+      @include viewport.until(sm) {
         gap: var(--spacing-inline-s);
-        //dont know why we even hide this crucial navigation on mobile
+
         .category-breadcrumb.hidden,
         .category-breadcrumb {
           display: flex !important;
-          column-gap: var(--spacing-inline-s);
+          column-gap: var(--spacing-inline-m);
           row-gap: var(--spacing-block-xs);
           flex-basis: 100%;
+
           li {
             margin-right: 0;
             margin-left: calc(
               (var(--spacing-block-s) - 2px) * -1
             ); // 2px is width of the outline
           }
+
+          .select-kit-header-wrapper {
+            gap: 0.25em;
+          }
+
           .select-kit-header {
             background: var(--d-content-background);
-            border: 0;
           }
         }
+
         .btn-default {
           border: 0;
           margin-right: 0;
+
           .d-icon {
             font-size: var(--font-up-1);
           }
         }
+
         .fk-d-button-tooltip {
           margin-right: 0;
           margin-left: var(
             --spacing-inline-xs
-          ); //pure visual correction for horitzontal alignment
+          ); // pure visual correction for horizontal alignment
+
           &:has(#create-topic) {
             order: 1;
           }
         }
       }
+
       #navigation-bar,
       .navigation-controls,
       .category-breadcrumb {
-        @include breakpoint(mobile-extra-large) {
+        @include viewport.until(sm) {
           margin-bottom: 0;
         }
       }
+
       .navigation-controls {
-        @include breakpoint(mobile-extra-large) {
+        @include viewport.until(sm) {
           gap: var(--spacing-inline-s);
         }
       }
@@ -79,12 +95,12 @@
   }
 
   .list-container {
-    @include breakpoint(mobile-extra-large) {
+    @include viewport.until(sm) {
       padding-inline: 0 !important;
     }
 
     .topic-list-body {
-      @include breakpoint(mobile-extra-large) {
+      @include viewport.until(sm) {
         border-top: 0;
         padding-top: 0;
       }
@@ -92,16 +108,18 @@
   }
 
   #topic-title {
-    @include breakpoint(mobile-extra-large) {
+    @include viewport.until(sm) {
       padding-inline: var(--spacing-inline-s) !important;
 
       .title-wrapper {
         gap: var(--spacing-block-s);
       }
+
       .topic-category {
         order: -1;
       }
-      //make mixin of this
+
+      // make mixin of this
       .badge-category__wrapper {
         font-size: var(--font-down-2-rem);
         border-radius: var(--d-border-radius);
@@ -123,12 +141,15 @@
           oklch(from var(--category-badge-color) 100% calc(c * 0.9) h)
         );
       }
+
       .discourse-tags {
         gap: var(--spacing-inline-xs);
+
         &__tag-separator {
           display: none;
         }
       }
+
       .discourse-tag {
         font-size: var(--font-down-2-rem);
         padding: var(--spacing-inline-xs) var(--spacing-inline-s);
@@ -139,8 +160,9 @@
       }
     }
   }
+
   .container.posts {
-    @include breakpoint(mobile-extra-large) {
+    @include viewport.until(sm) {
       padding-inline: var(--spacing-inline-xs) !important;
 
       .main-avatar .avatar {
@@ -154,18 +176,22 @@
             font-size: var(--font-0-rem);
           }
         }
+
         .contents {
           padding-top: var(--spacing-block-m);
         }
       }
+
       .small-action {
         &-desc {
           padding: var(--spacing-block-xs) 0;
         }
-        //for core eventually, better way imo
+
+        // for core eventually, better way imo
         .topic-avatar {
           padding-top: 0;
           align-items: center;
+
           .d-icon {
             font-size: var(--font-up-1);
           }
@@ -175,29 +201,32 @@
   }
 
   #topic-footer-buttons {
-    @include breakpoint(mobile-extra-large) {
+    @include viewport.until(sm) {
       padding-inline: var(--spacing-inline-xs) !important;
     }
   }
 }
 
-//should be changed in core, should not be a primary btn
-//changing this into straight buttons to match the progress one, which doesnt work well with rounded corners
+// should be changed in core, should not be a primary btn
+// changing this into straight buttons to match the progress one, which doesn't work well with rounded corners
 #topic-progress-wrapper {
   .progress-back-container {
     margin-right: 0;
     margin-bottom: var(--spacing-block-xs);
+
     .btn-primary.progress-back {
       border-radius: 0;
       background: var(--secondary);
       border: 1px solid var(--tertiary-low);
       color: var(--accent-color);
       padding: var(--spacing-inline-s) var(--spacing-inline-m);
+
       .d-icon {
         color: var(--accent-color);
       }
     }
   }
+
   .topic-admin-menu-trigger {
     border-radius: 0;
     background: var(--secondary);

scss/nav-pills.scss

@@ -1,36 +1,64 @@
+@use "lib/viewport";
 .list-controls {
   position: sticky;
   top: var(--header-offset);
   background: var(--d-content-background);
   z-index: z("base");
-  padding: 1.5rem 0 1rem 0;
+  padding: 1.5rem 0 0 0;
   max-width: unset;
 
+  @include viewport.until(sm) {
+    padding-bottom: 1em;
+  }
+
   .navigation-container {
+    position: relative;
     gap: 1rem;
+
+    @include viewport.from(sm) {
+      &:after {
+        content: "";
+        position: absolute;
+        left: 0;
+        right: 0;
+        bottom: -1rem;
+        height: 1rem;
+        background: linear-gradient(
+          to bottom,
+          var(--d-content-background),
+          transparent
+        );
+      }
+    }
+
     .category-breadcrumb {
       order: 1;
     }
   }
+
   .combo-box .combo-box-header {
-    // needs more specificy than just in the button file
+    // needs more specificity than just in the button file
     background-color: var(--secondary);
-    border-radius: var(--d-border-radius-large);
+    border-radius: var(--d-border-radius);
     border: 1px solid var(--primary-300);
+
     &:hover {
       border: 1px solid var(--accent-color);
     }
+
     &:focus-visible {
       .discourse-no-touch & {
         background: var(--secondary);
         color: var(--accent-color);
-        box-shadow: 0px 0px 0px 3px var(--button-box-shadow);
+        box-shadow: 0 0 0 3px var(--button-box-shadow);
+
         .d-icon {
           color: var(--accent-color);
         }
       }
     }
   }
+
   .select-kit.combo-box.category-drop.has-selection
     .category-drop-header:hover {
     border-color: transparent;
@@ -47,6 +75,7 @@
   .discourse-no-touch & {
     background: transparent;
     color: var(--d-nav-color--hover);
+
     &::after {
       content: "";
       position: absolute;

scss/sidebar-new-topic-button.scss

@@ -5,6 +5,12 @@
   }
 }
 
+.has-ai-conversations-sidebar {
+  .sidebar-new-topic-button__wrapper {
+    display: none;
+  }
+}
+
 .sidebar-new-topic-button {
   flex: 1 1 auto;
 
@@ -45,6 +51,7 @@
         border-radius: 0 var(--d-button-border-radius)
           var(--d-button-border-radius) 0;
         padding-right: 0.65em;
+
         .d-icon {
           color: var(--secondary);
         }

scss/sidebar.scss

@@ -1,18 +1,24 @@
+@use "lib/viewport";
+
 .sidebar-wrapper,
 .sidebar-hamburger-dropdown {
-  @include breakpoint(medium) {
+  @include viewport.until(lg) {
     background: var(--secondary);
+
     .sidebar-footer-wrapper {
       background: var(--secondary);
+
       .sidebar-footer-container::before {
         display: none;
       }
     }
   }
+
   .has-full-page-chat &,
   .has-full-page-chat & .sidebar-footer-wrapper {
     background: transparent;
   }
+
   .sidebar-container {
     border-right: none;
   }
@@ -20,31 +26,38 @@
   .sidebar-sections {
     padding: 0;
   }
+
   .sidebar-section-link {
     transition: none;
     border-radius: var(--d-border-radius);
   }
+
   .dropdown-menu__item .sidebar-section-link {
-    border-radius: 0px;
+    border-radius: 0;
   }
 }
+
 .sidebar-section-wrapper {
-  @include breakpoint(extra-large, $rule: min-width) {
+  @include viewport.from(xl) {
     padding-block: 0.45em;
   }
-  @include breakpoint(mobile-extra-large) {
+
+  @include viewport.until(sm) {
     .hamburger-panel .revamped & {
       margin-bottom: var(--spacing-block-m);
     }
   }
+
   .sidebar-section-header {
     font-size: var(--font-down-2);
   }
+
   .sidebar-section-content {
     margin: 0;
     display: flex;
     flex-direction: column;
-    @include breakpoint(extra-large, $rule: min-width) {
+
+    @include viewport.from(xl) {
       gap: var(--spacing-block-xs);
     }
   }
@@ -52,6 +65,7 @@
 
 .sidebar-wrapper .sidebar-sections {
   --scrollbarThumbBg: var(--d-selected);
+  padding: 0 1rem;
 }
 
 .sidebar-section-link-wrapper .sidebar-section-link:focus,
@@ -63,11 +77,17 @@
 
 .sidebar-new-topic-button__wrapper {
   margin: 0 var(--spacing-inline-m) var(--spacing-block-l);
+
   .sidebar-new-topic-button .d-icon {
     display: none;
   }
 }
 
-.sidebar-wrapper .sidebar-sections {
-  padding: 0 1rem;
+// put the draft menu above the slide-out hamburger on small desktop screens
+@include viewport.until(md) {
+  html:not(.mobile-view) {
+    .topic-drafts-menu-content {
+      z-index: z("modal", "overlay");
+    }
+  }
 }

scss/topic-cards.scss

@@ -1,9 +1,12 @@
+@use "lib/viewport";
+
 .topic-list .topic-list-item-separator {
   display: none;
 }
 
 .topic-list > .topic-list-body > .topic-list-item.last-visit {
   border-bottom: 1px solid var(--primary-300);
+
   &:hover {
     border-color: var(--accent-color);
   }
@@ -13,95 +16,107 @@
   border: none;
   display: flex;
   flex-direction: column;
-  gap: 1em;
-  @include breakpoint(medium) {
+  gap: 1.25em;
+
+  @include viewport.until(lg) {
     gap: 0.5em;
     padding: 0 0.5em;
   }
-  @include breakpoint(mobile-extra-large) {
+
+  @include viewport.until(sm) {
     gap: 0;
     padding: 0;
   }
 }
 
 .topic-list-body .topic-list-item {
+  position: relative;
+  background: var(--d-content-background);
+  box-shadow: 0 0 12px 1px var(--topic-card-shadow);
   text-overflow: ellipsis;
   padding: 0.75em 1rem;
   border: 1px solid var(--primary-300);
   display: grid;
-  grid-template-columns: 20px min-content min-content auto min-content;
-  grid-template-rows: auto minmax(20px, auto);
+  grid-template-columns: min-content min-content auto min-content;
   grid-template-areas:
-    ". . . . status"
-    "activity . . likes-replies category";
-  grid-column-gap: 12px;
-  grid-row-gap: 8px;
+    "creator title title status"
+    "creator category activity likes-replies";
+  grid-column-gap: 0.75rem;
+  grid-row-gap: 0.5rem;
   border-radius: var(--d-border-radius);
-  td.main-link .link-top-line {
-    grid-row: 1/2;
-    grid-column: 1/-1;
-    font-weight: 500;
-  }
-  &.--has-status-card td.main-link .link-top-line {
-    grid-column: 1/-2;
-  }
-  @include breakpoint(extra-large) {
+  cursor: pointer;
+
+  .bulk-select-enabled & {
+    grid-template-columns: min-content min-content min-content auto min-content;
     grid-template-areas:
-      ". . . . status"
-      "activity . . likes-replies category";
+      "bulk-select creator title title status"
+      "bulk-select creator category activity likes-replies";
   }
-  @include breakpoint(mobile-extra-large) {
-    td.main-link .link-top-line,
-    &.--has-status-card td.main-link .link-top-line {
-      grid-row: 2/3;
-      grid-column: 1/-1;
-    }
-    grid-template-columns: 20px repeat(5, 1fr);
-    grid-template-rows: auto auto auto;
+
+  @include viewport.until(sm) {
     grid-template-areas:
-      "category category category category category status"
-      ". . . . . ."
-      "activity . . . . likes-replies";
+      "category category category status"
+      "creator title title title"
+      "activity activity activity likes-replies";
+    row-gap: 0.75em;
     border: none;
     border-bottom: 1px solid var(--primary-200);
     box-shadow: none;
     border-radius: 0;
   }
-  &.excerpt-expanded {
-    grid-template-columns: 20px auto auto min-content min-content;
-    grid-template-rows: auto auto auto;
-    grid-template-areas:
-      ". . . . status"
-      "activity . . . ."
-      "excerpt excerpt excerpt likes-replies category";
-    @include breakpoint(extra-large) {
-      grid-template-areas:
-        ". . . . status"
-        "activity . . . ."
-        "excerpt excerpt excerpt likes-replies category";
+
+  &:hover {
+    .discourse-no-touch & {
+      border-color: var(--accent-color);
+      background: var(--d-content-background);
     }
-    @include breakpoint(mobile-extra-large) {
-      grid-template-rows: auto auto auto;
-      grid-template-areas:
-        "category category category category status"
-        ". . . . ."
-        "activity . . . likes-replies";
+  }
+
+  &.selected {
+    box-shadow:
+      0 0 0 2px var(--accent-color),
+      0 0 12px 1px var(--topic-card-shadow);
+  }
+
+  &.excerpt-expanded {
+    @include viewport.until(sm) {
       .topic-excerpt,
       .link-bottom-line {
         display: none;
       }
     }
-    .topic-likes-replies-data {
-      align-self: flex-end;
+
+    @include viewport.from(sm) {
+      grid-template-areas:
+        "creator title title status"
+        "creator category activity likes-replies "
+        "creator excerpt excerpt excerpt";
+
+      .bulk-select-enabled & {
+        grid-template-areas:
+          "bulk-select creator title title status"
+          "bulk-select creator category activity likes-replies "
+          " bulk-select creator excerpt excerpt excerpt";
+      }
     }
-    .topic-category-data {
-      align-items: flex-end;
+
+    // when there is enough space, excerpt can be next to likes-replies
+    @include viewport.from(lg) {
+      grid-template-areas:
+        "creator title title status"
+        "creator category activity ."
+        "creator excerpt excerpt likes-replies";
     }
-    .badge-category__wrapper {
-      height: min-content;
-    }
-    .link-bottom-line {
-      display: flex;
+  }
+
+  .link-top-line {
+    grid-area: title;
+    font-weight: 500;
+    display: flex;
+    align-items: center;
+
+    .title {
+      padding: 0;
     }
   }
 
@@ -110,7 +125,8 @@
   td.posters,
   td.posts,
   td.views,
-  td.activity {
+  td.activity,
+  td.topic-category-status-data {
     display: contents;
   }
 
@@ -118,113 +134,150 @@
     padding: 0;
   }
 
-  // topic activity, avatar, text
+  // display:nones
+  td.main-link a.topic-status,
+  .link-bottom-line,
+  .badge-notification.new-topic::before {
+    display: none;
+  }
+
+  .topic-category-data {
+    grid-area: category;
+    display: flex;
+  }
+
+  .badge-category__wrapper {
+    border-radius: var(--d-border-radius);
+    padding: 0.25em 0.5rem;
+    background-color: light-dark(
+      oklch(from var(--category-badge-color) 97% calc(c * 0.3) h),
+      oklch(from var(--category-badge-color) 45% calc(c * 0.5) h)
+    );
+
+    @include viewport.until(md) {
+      padding: 0.25em 0.5rem;
+      font-size: var(--font-down-2);
+    }
+
+    .badge-category__name {
+      color: light-dark(
+        oklch(from var(--category-badge-color) 20% calc(c * 1) h),
+        oklch(from var(--category-badge-color) 100% calc(c * 0.9) h)
+      );
+    }
+  }
+
+  // OP avatar
+  .topic-creator-data {
+    grid-area: creator;
+
+    .avatar {
+      height: 50px;
+      width: 50px;
+      border-radius: var(--d-border-radius);
+
+      @include viewport.until(sm) {
+        height: 30px;
+        width: 30px;
+        border-radius: 0.25rem;
+      }
+    }
+  }
+
+  .dot-separator {
+    width: 0.25em;
+    height: 0.25em;
+    background-color: var(--primary-500);
+    border-radius: 100%;
+    margin-inline: 0.25em;
+  }
+
+  // topic activity, icon, text
   .topic-activity-data {
+    @include ellipsis;
     grid-area: activity;
   }
+
   .topic-activity {
-    display: grid;
-    grid-template-columns: 20px auto auto auto;
+    display: flex;
     font-size: var(--font-down-1);
     height: 100%;
     align-items: center;
     gap: 0.25em;
   }
 
-  .topic-activity__user .avatar {
-    width: 20px;
-    height: 20px;
-    border-radius: 4px;
-  }
-
-  .topic-activity__user {
-    height: 20px;
-    width: 20px;
-    border-radius: 4px;
+  .topic-activity__type {
+    border-radius: 0.25rem;
     display: flex;
     align-items: center;
     justify-content: center;
-    background-color: var(--primary-low);
   }
 
   .topic-activity__username {
+    @include ellipsis;
     margin-left: 0.25em;
-    text-wrap: nowrap;
   }
 
-  @include breakpoint(mobile-extra-large) {
-    .topic-activity__username {
-      display: none;
-    }
-    .topic-activity__reason {
-      margin-left: 0.25em;
-    }
-  }
-
-  .topic-activity.--updated .topic-activity__reason {
-    margin-left: 0.25em;
+  // timestamp
+  td.activity .post-activity {
+    grid-area: activity;
+    font-size: var(--font-down-1);
+    color: var(--primary-500);
+    margin-left: auto;
+    padding: 0;
   }
 
   // status
   .topic-status-data {
     grid-area: status;
   }
-  .topic-status-data {
-    grid-area: status;
-    position: relative;
-  }
+
   .topic-status-card {
     height: min-content;
     margin-left: auto;
     display: flex;
     flex-direction: row;
-    gap: 4px;
+    gap: 0.25em;
     align-items: center;
-    padding: 0 6px;
-    font-size: var(--font-down-2);
+    padding: 0.2em 0.5rem;
+    font-size: var(--font-down-3);
     font-weight: 600;
     border-radius: var(--d-border-radius);
     border: 1px solid var(--status-color);
     color: var(--status-color);
     width: min-content;
-    @include breakpoint("large", min-width) {
-      position: absolute;
-      right: 0px;
-      top: -20px;
-      background-color: var(--d-content-background);
-      height: 20px;
-      font-size: var(--font-down-3);
+
+    &.--pinned {
+      --status-color: var(--primary-500);
     }
+
+    &.--hot {
+      --status-color: #e45735;
+    }
+
+    @include viewport.from(lg) {
+      position: absolute;
+      right: 1rem;
+      top: 0;
+      transform: translateY(-45%);
+      background-color: var(--d-content-background);
+    }
+
     svg {
       font-size: var(--font-down-1);
       color: var(--status-color);
     }
   }
 
-  .topic-status-card.--pinned {
-    --status-color: var(--primary-500);
-  }
-  .topic-status-card.--hot {
-    --status-color: #e45735;
-  }
-
   .link-top-line .event-date {
     margin-left: 0.5em;
     font-size: var(--font-down-3);
   }
 
-  td.main-link a.topic-status {
-    display: none;
-  }
-
   .topic-list-data {
     padding: 0;
   }
 
-  td.main-link .link-top-line a.raw-topic-link {
-    padding: 0;
-  }
-
   .topic-post-badges .badge-notification.unread-posts,
   .topic-post-badges .badge-notification.new-topic {
     background-color: var(--tertiary);
@@ -237,27 +290,13 @@
     min-width: unset;
   }
 
-  // timestamp
-  td.activity .post-activity {
-    grid-area: activity;
-    font-size: var(--font-down-1);
-    color: var(--primary-500);
-    margin-left: auto;
-    padding: 0;
-  }
-
-  .link-bottom-line {
-    display: none;
-  }
-
-  // metadata
   // metadata - excerpt
-  .topic-excerpt,
-  td.main-link .link-bottom-line {
-    grid-row: 3 / -1;
-    grid-column: 1 / -3;
+  .topic-excerpt {
+    grid-area: excerpt;
     margin: 0;
+    padding: 0;
     font-size: var(--font-down-2);
+    width: 100%;
 
     .excerpt__contents {
       color: var(--primary-high);
@@ -269,38 +308,6 @@
     }
   }
 
-  td.topic-category-status-data {
-    display: contents;
-  }
-  td.topic-category-data {
-    grid-area: category;
-    display: flex;
-    justify-content: flex-end;
-    @include breakpoint(mobile-extra-large) {
-      justify-content: flex-start;
-    }
-  }
-  td.topic-category-data .badge-category__wrapper,
-  td.main-link .link-bottom-line .badge-category__wrapper {
-    border-radius: var(--d-border-radius);
-    padding: 3px 6px;
-    background-color: light-dark(
-      oklch(from var(--category-badge-color) 97% calc(c * 0.3) h),
-      oklch(from var(--category-badge-color) 45% calc(c * 0.5) h)
-    );
-
-    @include breakpoint(tablet) {
-      padding: 2px 6px;
-      font-size: var(--font-down-2);
-    }
-
-    .badge-category__name {
-      color: light-dark(
-        oklch(from var(--category-badge-color) 20% calc(c * 1) h),
-        oklch(from var(--category-badge-color) 100% calc(c * 0.9) h)
-      );
-    }
-  }
   td.main-link .discourse-tags {
     display: none;
   }
@@ -321,6 +328,7 @@
     height: min-content;
     align-self: center;
   }
+
   .topic-likes-replies-data .topic-likes,
   .topic-likes-replies-data .topic-replies {
     display: flex;
@@ -328,60 +336,72 @@
     gap: 0.5em;
     align-items: center;
     color: var(--primary-500);
+    font-size: var(--font-down-1-rem);
+
     svg {
       color: var(--primary-600);
     }
   }
-}
 
-.topic-list-item {
-  background: var(--d-content-background);
-  box-shadow: 0px 0px 12px 1px var(--topic-card-shadow);
-  &:hover {
-    .discourse-no-touch & {
-      border-color: var(--accent-color);
-      background: var(--d-content-background);
+  .bulk-select {
+    grid-area: bulk-select;
+    padding: 0;
+    margin: 0;
+    align-self: center;
+    justify-self: center;
+
+    @include viewport.until(sm) {
+      align-self: flex-start;
+    }
+
+    label {
+      margin: 0;
+    }
+
+    &th {
+      display: none;
     }
-  }
-  &.selected {
-    box-shadow: 0px 0px 0px 2px var(--accent-color),
-      0px 0px 12px 1px var(--topic-card-shadow);
   }
 }
 
 // Bookmarks
-
 .topic-list-item.bookmark-list-item {
   .link-bottom-line {
     font-size: unset;
   }
-  //regular card without excerpt class
+
+  // regular card without excerpt class
   grid-template-columns: 20px min-content min-content auto min-content min-content min-content;
   grid-template-areas:
     ". . . . . . dropdown"
     "avatar update metadata metadata metadata . category";
-  @include breakpoint(mobile-extra-large) {
+
+  @include viewport.until(sm) {
     grid-template-columns: min-content min-content auto min-content min-content min-content min-content;
     grid-template-areas:
       " . . . . . . dropdown"
       "update metadata metadata metadata metadata category category";
+
     .avatar {
       display: none;
     }
   }
+
   &.has-metadata {
     grid-template-columns: 20px min-content min-content auto min-content min-content min-content;
-    @include breakpoint(mobile-extra-large) {
+
+    @include viewport.until(sm) {
       grid-template-areas:
         ". . . . . . . dropdown"
         "update update metadata metadata metadata metadata category category";
+
       .avatar {
         display: none;
       }
     }
   }
 
-  //card with excerpt (all in horizon since the toggle is gone)
+  // card with excerpt (all in horizon since the toggle is gone)
   &.excerpt-expanded {
     grid-template-columns: 20px min-content auto minmax(0, 100px);
     grid-template-areas:
@@ -390,21 +410,16 @@
       "excerpt excerpt excerpt ."
       "excerpt excerpt excerpt category";
 
-    .badge-category__wrapper {
-      align-self: flex-end;
-      height: min-content;
-      max-width: 100%;
-    }
-
-    @include breakpoint(extra-large, $rule: min-width) {
+    @include viewport.from(xl) {
       grid-template-columns: 20px min-content auto min-content;
     }
 
-    @include breakpoint(mobile-extra-large) {
+    @include viewport.until(sm) {
       grid-template-columns: auto min-content;
       grid-template-areas:
         ".  dropdown"
         "category category";
+
       .post-excerpt,
       .avatar {
         display: none;
@@ -418,7 +433,8 @@
         "avatar update metadata metadata"
         "excerpt excerpt excerpt . "
         "excerpt excerpt excerpt category";
-      @include breakpoint(mobile-extra-large) {
+
+      @include viewport.until(sm) {
         grid-template-columns: auto min-content;
         grid-template-areas:
           " . dropdown"
@@ -429,13 +445,21 @@
         }
       }
     }
+
+    .badge-category__wrapper {
+      align-self: flex-end;
+      height: min-content;
+      max-width: 100%;
+    }
   }
 
   td.author-avatar {
     grid-area: avatar;
   }
+
   td.main-link .link-bottom-line {
     display: contents;
+
     .badge-category__wrapper {
       grid-area: category;
       display: flex;
@@ -444,8 +468,10 @@
       justify-self: flex-end;
     }
   }
+
   td.main-link .link-top-line {
     display: contents;
+
     .bookmark-metadata {
       grid-area: metadata;
       margin: 0;
@@ -453,10 +479,12 @@
       align-items: center;
       gap: var(--spacing-inline-xs);
     }
+
     .bookmark-metadata-item {
       margin: 0;
       vertical-align: middle;
     }
+
     .bookmark-status-with-link {
       grid-column: 1/-2;
       grid-row: 1/2;
@@ -467,8 +495,10 @@
     grid-area: excerpt;
     margin: 0;
   }
+
   .topic-list-data:last-of-type {
     display: contents;
+
     .bookmark-actions-dropdown {
       grid-area: dropdown;
       align-self: flex-start;
@@ -480,6 +510,7 @@
         align-items: center;
         background: transparent;
       }
+
       .select-kit-header-wrapper {
         height: 1em;
         width: 1em;
@@ -490,6 +521,7 @@
   .post-metadata.topic-list-data.updated-at {
     grid-area: update;
   }
+
   td.activity .post-activity {
     display: none;
   }
@@ -499,7 +531,11 @@
 .topic-list-item.assigned-list-item {
   .topic-status-card {
     display: none;
+    position: relative;
+    top: unset;
+    right: unset;
   }
+
   td.main-link .link-top-line {
     grid-column: 1/-3;
   }
@@ -507,15 +543,18 @@
   grid-template-areas:
     ". . . . . status dropdown"
     "activity . . . . likes-replies category";
-  @include breakpoint(mobile-extra-large) {
+
+  @include viewport.until(sm) {
     grid-template-columns: 20px min-content min-content auto min-content min-content min-content 36px;
     grid-template-areas:
       "category category . . . . status dropdown"
       ". . . . . . . . "
       "activity . . . . . . likes-replies";
   }
+
   .assign-topic-buttons {
     display: contents;
+
     .assign-actions-dropdown {
       grid-area: dropdown;
       justify-content: flex-end;
@@ -527,31 +566,29 @@
         align-items: center;
         background: transparent;
       }
+
       .select-kit-header-wrapper {
         height: 1em;
         width: 1em;
       }
     }
   }
+
   td.topic-category-status-data {
     display: contents;
   }
-  .topic-status-card {
-    position: relative;
-    top: unset;
-    right: unset;
-  }
 }
 
 // User Messages
-
 body.user-messages-page {
   .topic-list-body {
     gap: 0;
   }
+
   .topic-list .topic-list-data.posters a:not(.latest) {
     display: block;
   }
+
   .topic-list-item {
     border-radius: 0;
     box-shadow: none;
@@ -563,30 +600,43 @@ body.user-messages-page {
     grid-template-areas: "title activity" "posters .";
     grid-template-columns: auto auto;
     grid-template-rows: auto auto;
+
+    &:hover {
+      .discourse-no-touch & {
+        background-color: var(--primary-low);
+        border-color: var(--primary-200);
+      }
+    }
+
     td.topic-category-data,
     td.topic-likes-replies-data,
-    td.topic-status-data {
+    td.topic-status-data,
+    td.topic-creator-data {
       display: none;
     }
-    &.visited .main-link .link-top-line {
-      font-weight: normal;
+
+    .main-link .link-top-line {
       grid-area: title;
     }
-    &:hover {
-      background-color: var(--primary-low);
-      border-color: var(--primary-200);
+
+    &.visited .main-link .link-top-line {
+      font-weight: normal;
     }
+
     td.topic-activity-data {
       grid-area: activity;
     }
+
     td.topic-list-data.posters {
       grid-area: posters;
       display: flex;
       align-items: center;
       height: 100%;
+
       a {
         margin-right: 4px;
       }
+
       .avatar {
         width: 20px;
         height: 20px;
@@ -597,60 +647,8 @@ body.user-messages-page {
   }
 }
 
-// Bulk select
-
-.bulk-select-enabled .topic-list-body .topic-list-item {
-  grid-template-areas:
-    "bulk-select . . . status"
-    "bulk-select activity activity . category";
-  td.topic-likes-replies-data {
-    display: none;
-  }
-  td.main-link .link-top-line,
-  &.--has-status-card td.main-link .link-top-line {
-    grid-column: 2/-1;
-    font-weight: 500;
-  }
-  .topic-excerpt {
-    grid-area: excerpt;
-    margin: 0;
-  }
-  &.excerpt-expanded {
-    grid-template-areas:
-      "bulk-select . . . status" "bulk-select activity . . ."
-      "bulk-select excerpt excerpt excerpt category";
-    @include breakpoint(mobile-extra-large) {
-      grid-template-areas:
-        "bulk-select category . . .  status"
-        "bulk-select . . . . ."
-        "bulk-select activity activity . . .";
-    }
-  }
-  .bulk-select {
-    grid-area: bulk-select;
-    padding: 0;
-    margin: 0;
-    align-self: center;
-    justify-self: center;
-    label {
-      margin: 0;
-    }
-  }
-  @include breakpoint(large) {
-    grid-template-areas:
-      "bulk-select . . . status"
-      "bulk-select activity activity . category";
-  }
-  @include breakpoint(mobile-extra-large) {
-    td.main-link .link-top-line,
-    &.--has-status-card td.main-link .link-top-line {
-      grid-column: 2/-1;
-      grid-row: 2;
-      font-weight: 500;
-    }
-    grid-template-areas:
-      "bulk-select category . . .  status"
-      "bulk-select . . . . ."
-      "bulk-select activity activity . . .";
-  }
+.event-date-container {
+  display: inline-flex;
+  position: relative;
+  top: -0.25em; // optical alignment
 }

scss/topic.scss

@@ -1,3 +1,5 @@
+@use "lib/viewport";
+
 .post-stream {
   .contents {
     font-size: var(--font-up-1);
@@ -6,21 +8,14 @@
   }
 }
 
-.container.posts .topic-navigation:not(.with-topic-progress) {
-  // super fragile because new sticky topic title doesnt have a calculated value (= 53px with this font and size but…)
-  top: calc(
-    var(--header-offset, 60px) + 53px + calc(var(--spacing-block-l) * 2)
-  );
-  z-index: 300;
-}
-
 .timeline-container .topic-timeline {
   min-width: unset; // why we have this?
+
   .timeline-scrollarea {
     border-left: 1px solid var(--accent-color);
 
     .timeline-scroller {
-      @include breakpoint("medium", $rule: min-width) {
+      @include viewport.from(lg) {
         margin-left: -4.5px;
         background: var(--d-content-background);
         height: 40px !important; // height is coming from element style have no other choice
@@ -31,9 +26,11 @@
         line-height: 1;
       }
     }
+
     .timeline-handle {
       background-color: var(--accent-color);
-      @include breakpoint("medium", $rule: min-width) {
+
+      @include viewport.from(lg) {
         width: 8px;
         border-radius: 10px;
         height: calc(100% - 6px);
@@ -42,9 +39,9 @@
   }
 }
 
-//should probably get rid of this extra specificity class in core?
+// should probably get rid of this extra specificity class in core?
 .timeline-container.timeline-fullscreen {
-  @include breakpoint("medium", $rule: max-width) {
+  @include viewport.until(lg) {
     .topic-timeline
       .timeline-scrollarea
       .timeline-scroller
@@ -56,7 +53,8 @@
 
 .container.posts {
   grid-template-columns: auto 8em;
-  @media screen and (max-width: 924px) {
+
+  @media screen and (width <= 924px) {
     grid-template-columns: auto auto;
   }
 

scss/variables.scss

@@ -3,8 +3,8 @@
   --d-border-radius-large: 20px;
   --d-border-radius: 8px;
   --d-input-border-radius: 6px;
-  // --d-sidebar-row-height: 2.8em;
-  //the idea is: block spacing can grow with font-size, but inline spacing should not to maintain horizontal (text) alignment
+
+  // the idea is: block spacing can grow with font-size, but inline spacing should not to maintain horizontal (text) alignment
   --spacing-block-xs: 0.25em;
   --spacing-block-s: 0.5em;
   --spacing-block-sm: 0.75em;

scss/welcome-banner.scss

@@ -1,3 +1,5 @@
+@use "lib/viewport";
+
 .welcome-banner {
   &__wrap {
     display: grid;
@@ -9,11 +11,11 @@
     padding: 1.5em 0 2.5em;
     margin-bottom: 0;
 
-    @media screen and (max-width: 768px) {
+    @media screen and (width <= 768px) {
       padding: 1em;
     }
 
-    @include breakpoint("mobile-extra-large") {
+    @include viewport.until(sm) {
       display: block;
       padding: 0.5em;
       margin-top: 0;
@@ -24,22 +26,27 @@
       grid-row: 1/-1;
       width: 100%;
       align-self: center;
-      @media screen and (max-width: 1028px) {
+
+      @media screen and (width <= 1028px) {
         grid-row: 2/-1;
         grid-column: 1/-1;
       }
-      @media screen and (max-width: 768px) {
+
+      @media screen and (width <= 768px) {
         grid-column: 2/-1;
         grid-row: 1/-1;
       }
-      @media screen and (max-width: 600px) {
+
+      @media screen and (width <= 600px) {
         grid-row: 2/-1;
         grid-column: 1/-1;
       }
-      @include breakpoint("mobile-extra-large") {
+
+      @include viewport.until(sm) {
         display: none;
       }
     }
+
     p {
       display: none;
     }
@@ -49,24 +56,29 @@
   .search-menu-container .search-input {
     background: var(--d-content-background);
     border: 1px solid var(--search-color);
-    box-shadow: 0 4px 10px rgba(52, 6, 121, 15%);
+    box-shadow: 0 4px 10px rgb(52, 6, 121, 15%);
   }
+
   .search-menu .search-input:focus-within,
   .search-menu-container .search-input:focus-within {
     border: 1px solid var(--search-color);
     outline: 2px solid var(--search-color);
   }
+
   .search-menu .d-icon,
   .search-menu .searching .d-icon,
   .search-menu .searching .show-advanced-search .d-icon {
     color: var(--search-color);
   }
+
   .panel-body {
     z-index: z("dropdown");
   }
+
   .results {
     background: var(--d-content-background);
   }
+
   &__title {
     grid-column: 1/2;
     grid-row: 1/-1;
@@ -75,26 +87,30 @@
     margin: 0;
     font-weight: 400;
     color: var(--search-color);
-    @media screen and (max-width: 1028px) {
+
+    @media screen and (width <= 1028px) {
       font-size: var(--font-up-4);
       grid-column: 1/-1;
       grid-row: 1;
       text-align: center;
       margin-bottom: 0.5em;
     }
-    @media screen and (max-width: 768px) {
+
+    @media screen and (width <= 768px) {
       text-align: left;
       grid-column: 1/2;
       grid-row: 1/-1;
       font-size: var(--font-up-3);
     }
-    @media screen and (max-width: 600px) {
+
+    @media screen and (width <= 600px) {
       grid-column: 1/-1;
       grid-row: 1;
       text-align: center;
       margin-bottom: 0.5em;
     }
-    @include breakpoint("mobile-extra-large") {
+
+    @include viewport.until(sm) {
       font-size: var(--font-up-2);
     }
   }

spec/system/horizon_high_level_spec.rb

@@ -39,6 +39,7 @@ describe "Horizon theme | High level", type: :system do
         "topic-status-data",
         "topic-category-data",
         "topic-likes-replies-data",
+        "topic-creator-data",
         "topic-activity-data",
       ],
     )

stylelint.config.mjs

@@ -0,0 +1,3 @@
+export default {
+  extends: ["@discourse/lint-configs/stylelint"],
+};