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

README.md

@@ -1,5 +1,3 @@
-# next-gen
+Horizon is a simple, beautiful theme that improves the out-of-the-box experience for Discourse sites.
 
-**Theme Summary**
-
-For more information, please see: **url to meta topic**
+https://meta.discourse.org/t/horizon-theme/360486

about.json

@@ -1,26 +1,135 @@
 {
-  "name": "next-gen",
+  "name": "Horizon",
   "authors": "Design Team",
-  "about_url": "TODO: Put your theme's public repo or Meta topic URL here",
-  "license_url": "TODO: Put your theme's LICENSE URL here",
-  "learn_more": "TODO",
+  "about_url": "https://meta.discourse.org/t/horizon-theme/360486",
+  "license_url": "https://github.com/discourse/horizon/blob/main/LICENSE",
+  "learn_more": "https://meta.discourse.org/t/installing-a-theme-or-theme-component/63682",
   "theme_version": "0.0.1",
-  "minimum_discourse_version": null,
-  "maximum_discourse_version": null,
-  "assets": {},
-  "modifiers": {},
+  "modifiers": {
+    "svg_icons": ["fire"],
+    "serialize_topic_is_hot": true
+  },
   "color_schemes": {
-    "next_gen": {
+    "Horizon": {
       "primary": "1A1A1A",
-      "secondary": "F5F8FF",
-      "header_background": "F5F8FF",
-      "tertiary": "595bca"
+      "secondary": "ffffff",
+      "tertiary": "595bca",
+      "tertiary-med-or-tertiary": "595bca",
+      "selected": "d7dfff",
+      "header_background": "ffffff",
+      "header_primary": "1A1A1A",
+      "hover": "E1E8FF"
     },
-    "next_gen_dark": {
-      "primary": "F5F8FF",
+    "Horizon Dark": {
+      "primary": "ffffff",
       "secondary": "1A1A1A",
+      "tertiary": "595bca",
+      "tertiary-med-or-tertiary": "595bca",
+      "selected": "3b3e56",
       "header_background": "1A1A1A",
-      "tertiary": "595bca"
+      "header_primary": "ffffff",
+      "hover": "333548"
+    },
+    "Royal": {
+      "primary": "1A1A1A",
+      "secondary": "ffffff",
+      "tertiary": "1F7BC1",
+      "tertiary-med-or-tertiary": "1F7BC1",
+      "selected": "c7e3ff",
+      "header_background": "ffffff",
+      "header_primary": "1A1A1A",
+      "hover": "D6EBFF"
+    },
+    "Royal Dark": {
+      "primary": "ffffff",
+      "secondary": "1A1A1A",
+      "tertiary": "1F7BC1",
+      "tertiary-med-or-tertiary": "1F7BC1",
+      "selected": "3a455f",
+      "header_background": "1A1A1A",
+      "header_primary": "ffffff",
+      "hover": "323B4E"
+    },
+    "Clover": {
+      "primary": "1A1A1A",
+      "secondary": "ffffff",
+      "tertiary": "39845B",
+      "tertiary-med-or-tertiary": "39845B",
+      "selected": "c6f1d5",
+      "header_background": "ffffff",
+      "header_primary": "1A1A1A",
+      "hover": "D5F5E0"
+    },
+    "Clover Dark": {
+      "primary": "ffffff",
+      "secondary": "1A1A1A",
+      "tertiary": "39845B",
+      "tertiary-med-or-tertiary": "39845B",
+      "selected": "47594e",
+      "header_background": "1A1A1A",
+      "header_primary": "ffffff",
+      "hover": "3C4A40"
+    },
+    "Lily": {
+      "primary": "1A1A1A",
+      "secondary": "ffffff",
+      "tertiary": "cc338c",
+      "tertiary-med-or-tertiary": "cc338c",
+      "selected": "ffc8ee",
+      "header_background": "ffffff",
+      "header_primary": "1A1A1A",
+      "hover": "FFD7F3"
+    },
+    "Lily Dark": {
+      "primary": "ffffff",
+      "secondary": "1A1A1A",
+      "tertiary": "cc338c",
+      "tertiary-med-or-tertiary": "cc338c",
+      "selected": "5f3e4e",
+      "header_background": "1A1A1A",
+      "header_primary": "ffffff",
+      "hover": "4E3640"
+    },
+    "Violet": {
+      "primary": "1A1A1A",
+      "secondary": "ffffff",
+      "tertiary": "9b15de",
+      "tertiary-med-or-tertiary": "9b15de",
+      "selected": "feccff",
+      "header_background": "ffffff",
+      "header_primary": "1A1A1A",
+      "hover": "FFD9FF"
+    },
+    "Violet Dark": {
+      "primary": "ffffff",
+      "secondary": "1A1A1A",
+      "tertiary": "9b15de",
+      "tertiary-med-or-tertiary": "9b15de",
+      "selected": "4c385c",
+      "header_background": "1A1A1A",
+      "header_primary": "ffffff",
+      "hover": "40314C"
+    },
+    "Marigold": {
+      "primary": "1A1A1A",
+      "secondary": "ffffff",
+      "tertiary": "d3881f",
+      "tertiary-med-or-tertiary": "d3881f",
+      "selected": "ffdcb2",
+      "header_background": "ffffff",
+      "header_primary": "1A1A1A",
+      "hover": "FFE6C6"
+    },
+    "Marigold Dark": {
+      "primary": "ffffff",
+      "secondary": "1A1A1A",
+      "tertiary": "d3881f",
+      "tertiary-med-or-tertiary": "d3881f",
+      "selected": "6c5b49",
+      "header_background": "1A1A1A",
+      "header_primary": "ffffff",
+      "hover": "584B3E"
     }
-  }
-}
+  },
+  "screenshots": ["screenshots/light.png", "screenshots/dark.png"]
+}

common/color_definitions.scss

@@ -0,0 +1,105 @@
+html {
+  --accent-color: #{$tertiary} !important;
+  --accent-text-color: #fff;
+
+  // Background Colors
+  --background-color: light-dark(
+    oklch(from #{$tertiary} 96% calc(c * 0.125) h),
+    oklch(from #{$tertiary} 10% 0.025 h)
+  ) !important;
+  --d-content-background: light-dark(
+    oklch(from #{$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),
+    oklch(from #{$tertiary} l calc(c * 0.25) h)
+  ) !important;
+  --header_primary-medium: light-dark(
+    oklch(from #{$tertiary} 54% calc(c * 0.5) h),
+    oklch(from #{$tertiary} calc(l * 1.35) calc(c * 0.25) h)
+  ) !important;
+
+  // Sidebar Colors
+  --d-sidebar-border-color: light-dark(
+    oklch(from #{$tertiary} 88% calc(c * 0.25) h),
+    oklch(from #{$tertiary} calc(l * 0.7) calc(c * 0.25) h)
+  ) !important;
+  --d-sidebar-link-color: light-dark(
+    oklch(from #{$tertiary} calc(l * 0.8) calc(c * 0.25) h),
+    oklch(from #{$tertiary} calc(l * 1.5) calc(c * 0.25) h)
+  ) !important;
+  --d-sidebar-active-color: #{$primary} !important;
+  --d-sidebar-suffix-color: light-dark(
+    oklch(from #{$tertiary} l calc(c * 0.9) h),
+    oklch(from #{$tertiary} l calc(c * 0.9) h)
+  ) !important;
+
+  // Other Colors
+  --d-selected: light-dark(
+    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)
+  ) !important;
+  --link-color-hover: light-dark(
+    oklch(from #{$tertiary} l c h),
+    oklch(from #{$tertiary} calc(l * 1.5) calc(c * 2.25) h)
+  ) !important;
+  --tertiary-hover: #{$tertiary} !important;
+
+  // Search Colors
+  --search-color: light-dark(
+    oklch(from #{$tertiary} l c h),
+    oklch(from #{$tertiary} calc(l * 1.5) calc(c * 0.25) h)
+  ) !important;
+
+  // Topic Card Colors
+  --topic-card-shadow: light-dark(
+    oklch(from #{$tertiary} calc(l * 1.85) calc(c * 0.5) h),
+    oklch(from #{$tertiary} calc(l * 0.2) calc(c * 0.01) h / 0.25)
+  ) !important;
+
+  // Button Colors
+  --button-box-shadow: light-dark(
+    oklch(from #{$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;
+  --d-sidebar-header-color: var(--d-sidebar-link-color) !important;
+  --d-sidebar-header-icon-color: var(--d-sidebar-link-color) !important;
+  --d-sidebar-active-suffix-color: var(--d-sidebar-suffix-color) !important;
+  --d-sidebar-background: var(--background-color) !important;
+  --d-sidebar-footer-fade: var(--background-color) !important;
+  --d-sidebar-prefix-background: var(--d-selected) !important;
+  --d-sidebar-active-prefix-background: light-dark(
+    oklch(from var(--d-selected) calc(l * 0.85) c h),
+    oklch(from var(--d-selected) calc(l * 0.7) c h)
+  ) !important;
+  --d-sidebar-highlight-prefix-background: light-dark(
+    oklch(from var(--d-selected) calc(l * 0.85) c h),
+    oklch(from var(--d-selected) calc(l * 0.7) c h)
+  ) !important;
+  --d-sidebar-highlight-suffix-color: var(
+    --d-sidebar-active-suffix-color
+  ) !important;
+  --d-sidebar-highlight-color: var(--primary) !important;
+  --d-sidebar-highlight-background: var(--d-selected) !important;
+  --d-sidebar-section-link-icon-size: 1em !important;
+  --d-hover: oklch(from var(--d-selected) l c h / 0.75) !important;
+  --d-input-bg-color: var(--d-content-background) !important;
+}

common/common.scss

@@ -1,13 +1,19 @@
+@import "box-view";
 @import "buttons";
+@import "chat";
+@import "color-choice";
+@import "composer";
+@import "composer-peek-mode";
 @import "header";
 @import "hiddenstuff";
+@import "login";
 @import "main";
+@import "misc";
+@import "mobile-stuff";
 @import "nav-pills";
-@import "search-banner";
+@import "welcome-banner";
 @import "sidebar";
+@import "sidebar-new-topic-button";
 @import "topic";
 @import "topic-cards";
 @import "variables";
-@import "box-view";
-@import "chat";
-@import "misc";

common/head_tag.html

@@ -0,0 +1,7 @@
+<script>
+  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>.';
+  }
+</script>

desktop/desktop.scss

@@ -0,0 +1,2 @@
+@import "desktop-horizon-fixes";
+@import "desktop-full-width";

javascripts/discourse/api-initializers/composer-peek-toggle-connector.js

@@ -0,0 +1,6 @@
+import { apiInitializer } from "discourse/lib/api";
+import ComposerPeekModeToggle from "../components/composer-peek-mode-toggle";
+
+export default apiInitializer("1.8.0", (api) => {
+  api.renderInOutlet("before-composer-toggles", ComposerPeekModeToggle);
+});

javascripts/discourse/api-initializers/full-width-logo-behavior.js

@@ -0,0 +1,16 @@
+import { apiInitializer } from "discourse/lib/api";
+
+export default apiInitializer("0.8", (api) => {
+  document.body.classList.add("full-width-enabled");
+
+  // When the sidebar is visible, force the HomeLogo to be in an 'un-minimized' state.
+  api.registerValueTransformer?.(
+    "home-logo-minimized",
+    ({ value, context }) => {
+      if (value && context.showSidebar) {
+        return false;
+      }
+      return value;
+    }
+  );
+});

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/api-initializers/horizon.gjs

@@ -0,0 +1,16 @@
+import { apiInitializer } from "discourse/lib/api";
+import ExperimentalScreen from "../components/experimental-screen";
+import UserColorPaletteSelector from "../components/user-color-palette-selector";
+
+export default apiInitializer("1.8.0", (api) => {
+  api.renderInOutlet("above-main-container", ExperimentalScreen);
+  api.renderInOutlet("sidebar-footer-actions", UserColorPaletteSelector);
+
+  api.registerValueTransformer("site-setting-enable-welcome-banner", () => {
+    return settings.enable_welcome_banner;
+  });
+
+  api.registerValueTransformer("site-setting-search-experience", () => {
+    return settings.search_experience;
+  });
+});

javascripts/discourse/api-initializers/next-gen.gjs

@@ -1,19 +0,0 @@
-import Component from "@glimmer/component";
-import { apiInitializer } from "discourse/lib/api";
-
-export default apiInitializer("1.8.0", (api) => {
-  api.renderInOutlet(
-    "above-main-container",
-    class ExperimentalScreen extends Component {
-      <template>
-        <ul class="experimental-screen">
-          <li class="experimental-screen__top-left"></li>
-          <li class="experimental-screen__top-right"></li>
-          <li class="experimental-screen__bottom-left"></li>
-          <li class="experimental-screen__bottom-right"></li>
-          <li class="experimental-screen__bottom-bar"></li>
-        </ul>
-      </template>
-    }
-  );
-});

javascripts/discourse/api-initializers/reposition-bulk-select.js

@@ -0,0 +1,7 @@
+import { apiInitializer } from "discourse/lib/api";
+
+export default apiInitializer("0.8.0", (api) => {
+  api.registerValueTransformer("bulk-select-in-nav-controls", () => {
+    return true;
+  });
+});

javascripts/discourse/api-initializers/sidebar-new-topic-button-connector.js

@@ -0,0 +1,6 @@
+import { apiInitializer } from "discourse/lib/api";
+import SidebarNewTopicButton from "../components/sidebar-new-topic-button";
+
+export default apiInitializer("1.8.0", (api) => {
+  api.renderInOutlet("before-sidebar-sections", SidebarNewTopicButton);
+});

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

@@ -0,0 +1,59 @@
+import Component from "@glimmer/component";
+import concatClass from "discourse/helpers/concat-class";
+import icon from "discourse/helpers/d-icon";
+import formatDate from "discourse/helpers/format-date";
+
+export default class TopicActivityColumn extends Component {
+  get topicUser() {
+    if (
+      moment(this.args.topic.bumped_at).isAfter(this.args.topic.last_posted_at)
+    ) {
+      return {
+        user: undefined,
+        username: undefined,
+        activityText: "user_updated",
+        class: "--updated",
+      };
+    }
+
+    if (this.args.topic.posts_count > 1) {
+      return {
+        user: this.args.topic.lastPosterUser,
+        username: this.args.topic.last_poster_username,
+        activityText: "user_replied",
+        class: "--replied",
+      };
+    } else if (this.args.topic.posts_count === 1) {
+      return {
+        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__type">
+        {{#if this.topicUser.user}}
+          {{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__time">
+        {{formatDate @topic.bumpedAt leaveAgo="true" format="tiny"}}
+      </div>
+    </span>
+  </template>
+}

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

@@ -0,0 +1,7 @@
+import { categoryLinkHTML } from "discourse/helpers/category-link";
+
+const TopicCategoryColumn = <template>
+  {{categoryLinkHTML @topic.category}}
+</template>;
+
+export default TopicCategoryColumn;

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-likes-column.gjs

@@ -0,0 +1,9 @@
+import icon from "discourse/helpers/d-icon";
+
+const TopicLikesColumn = <template>
+  {{#if @topic.like_count}}
+    <span class="topic-likes">{{icon "heart"}}{{@topic.like_count}}</span>
+  {{/if}}
+</template>;
+
+export default TopicLikesColumn;

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

@@ -0,0 +1,10 @@
+import { gt } from "truth-helpers";
+import icon from "discourse/helpers/d-icon";
+
+const TopicRepliesColumn = <template>
+  {{#if (gt @topic.replyCount 1)}}
+    <span class="topic-replies">{{icon "reply"}}{{@topic.posts_count}}</span>
+  {{/if}}
+</template>;
+
+export default TopicRepliesColumn;

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

@@ -0,0 +1,36 @@
+import Component from "@glimmer/component";
+import { service } from "@ember/service";
+import icon from "discourse/helpers/d-icon";
+import { i18n } from "discourse-i18n";
+
+export default class TopicStatusColumn extends Component {
+  @service siteSettings;
+
+  get badge() {
+    if (this.args.topic.is_hot) {
+      return {
+        icon: "fire",
+        text: "topic_hot",
+        className: "--hot",
+      };
+    }
+
+    if (this.args.topic.pinned) {
+      return {
+        icon: "thumbtack",
+        text: "topic_pinned",
+        className: "--pinned",
+      };
+    }
+
+    return null;
+  }
+
+  <template>
+    {{#if this.badge}}
+      <span class="topic-status-card {{this.badge.className}}">{{icon
+          this.badge.icon
+        }}{{i18n (themePrefix this.badge.text)}}</span>
+    {{/if}}
+  </template>
+}

javascripts/discourse/components/composer-peek-mode-toggle.gjs

@@ -0,0 +1,37 @@
+import Component from "@glimmer/component";
+import { tracked } from "@glimmer/tracking";
+import { action } from "@ember/object";
+import { service } from "@ember/service";
+import DButton from "discourse/components/d-button";
+import bodyClass from "discourse/helpers/body-class";
+
+export default class ComposerPeekModeToggle extends Component {
+  @service composer;
+  @service keyValueStore;
+
+  @tracked
+  peekModeActive = this.keyValueStore.getItem("peekModeActive") === "true";
+
+  get bodyCssClass() {
+    return this.peekModeActive ? "peek-mode-active" : "";
+  }
+
+  @action
+  togglePeekMode() {
+    this.peekModeActive = !this.peekModeActive;
+    this.keyValueStore.setItem("peekModeActive", this.peekModeActive);
+    if (this.composer.showPreview) {
+      this.composer.togglePreview();
+    }
+  }
+
+  <template>
+    {{bodyClass this.bodyCssClass}}
+    <DButton
+      @action={{this.togglePeekMode}}
+      @preventFocus={{true}}
+      @icon="discourse-sidebar"
+      class="btn-mini-toggle no-text peek-mode-toggle btn-transparent"
+    />
+  </template>
+}

javascripts/discourse/components/experimental-screen.gjs

@@ -0,0 +1,68 @@
+import Component from "@glimmer/component";
+import { tracked } from "@glimmer/tracking";
+import { action } from "@ember/object";
+import didInsert from "@ember/render-modifiers/modifiers/did-insert";
+import { service } from "@ember/service";
+import { htmlSafe } from "@ember/template";
+import { bind } from "discourse/lib/decorators";
+
+const DO_NOT_RENDER_LIST = ["login"];
+
+export default class ExperimentalScreen extends Component {
+  @service router;
+
+  @tracked left = 0;
+  @tracked right = 0;
+  resizeObserver;
+
+  willDestroy() {
+    super.willDestroy(...arguments);
+    this.resizeObserver.disconnect();
+  }
+
+  @bind
+  calculateDistance(element) {
+    const distance = element.getBoundingClientRect();
+    this.left = distance.left;
+    this.right = distance.right;
+  }
+
+  get distanceStyles() {
+    return htmlSafe(
+      `--left-distance: ${this.left}px; --right-distance: ${this.right}px;`
+    );
+  }
+
+  get shouldRender() {
+    return !DO_NOT_RENDER_LIST.includes(this.router.currentRouteName);
+  }
+
+  @action
+  onInsert(element) {
+    this.calculateDistance(element);
+
+    this.resizeObserver = new ResizeObserver((entries) => {
+      for (const entry of entries) {
+        this.calculateDistance(entry.target);
+      }
+    });
+
+    this.resizeObserver.observe(element);
+  }
+
+  <template>
+    {{#if this.shouldRender}}
+      <ul
+        class="experimental-screen"
+        {{didInsert this.onInsert}}
+        style={{this.distanceStyles}}
+      >
+        <li class="experimental-screen__top-left"></li>
+        <li class="experimental-screen__top-right"></li>
+        <li class="experimental-screen__bottom-left"></li>
+        <li class="experimental-screen__bottom-right"></li>
+        <li class="experimental-screen__bottom-bar"></li>
+      </ul>
+    {{/if}}
+  </template>
+}

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

@@ -0,0 +1,116 @@
+import Component from "@glimmer/component";
+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, not } from "truth-helpers";
+import CreateTopicButton from "discourse/components/create-topic-button";
+
+export default class SidebarNewTopicButton extends Component {
+  @service composer;
+  @service currentUser;
+  @service siteSettings;
+  @service router;
+  @service header;
+  @service appEvents;
+
+  @tracked category;
+  @tracked tag;
+
+  get shouldRender() {
+    return this.currentUser && !this.router.currentRouteName.includes("admin");
+  }
+
+  get canCreateTopic() {
+    return this.currentUser?.can_create_topic;
+  }
+
+  get draftCount() {
+    return this.currentUser?.get("draft_count");
+  }
+
+  get createTopicTargetCategory() {
+    if (this.category?.canCreateTopic) {
+      return this.category;
+    }
+
+    if (this.siteSettings.default_subcategory_on_read_only_category) {
+      return this.category?.subcategoryWithCreateTopicPermission;
+    }
+  }
+
+  get tagRestricted() {
+    return this.tag?.staff;
+  }
+
+  get createTopicDisabled() {
+    return (
+      (this.category && !this.createTopicTargetCategory) ||
+      (this.tagRestricted && !this.currentUser.staff)
+    );
+  }
+
+  get categoryReadOnlyBanner() {
+    if (this.category && this.currentUser && this.createTopicDisabled) {
+      return this.category.read_only_banner;
+    }
+  }
+
+  get createTopicClass() {
+    const baseClasses = "btn-default sidebar-new-topic-button";
+    return this.categoryReadOnlyBanner
+      ? `${baseClasses} disabled`
+      : baseClasses;
+  }
+
+  @action
+  createNewTopic() {
+    this.composer.openNewTopic({ category: this.category, tags: this.tag?.id });
+  }
+
+  @action
+  getCategoryandTag() {
+    this.category = this.router.currentRoute.attributes?.category || null;
+    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}}
+          @action={{this.createNewTopic}}
+          @disabled={{this.createTopicDisabled}}
+          @label="topic.create"
+          @btnClass={{this.createTopicClass}}
+          @canCreateTopicOnTag={{not this.tagRestricted}}
+          @showDrafts={{gt this.draftCount 0}}
+        />
+      </div>
+    {{/if}}
+  </template>
+}

javascripts/discourse/components/user-color-palette-menu-item.gjs

@@ -0,0 +1,44 @@
+import Component from "@glimmer/component";
+import { action } from "@ember/object";
+import { service } from "@ember/service";
+import { htmlSafe } from "@ember/template";
+import DButton from "discourse/components/d-button";
+import concatClass from "discourse/helpers/concat-class";
+
+export default class UserColorPaletteMenuItem extends Component {
+  @service site;
+  @service session;
+
+  get siteStyle() {
+    return `--icon-color: ${this.args.colorPalette.accent}`;
+  }
+
+  get activeClass() {
+    if (this.args.selectedColorPaletteId === this.args.colorPalette.id) {
+      return "active";
+    }
+  }
+
+  @action
+  paletteSelected() {
+    this.args.paletteSelected(this.args.colorPalette);
+  }
+
+  <template>
+    <div
+      class="user-color-palette-menu__item"
+      data-color-palette={{@colorPalette.name}}
+    >
+      <DButton
+        class={{concatClass
+          "btn-flat user-color-palette-menu__item-choice"
+          this.activeClass
+        }}
+        style={{htmlSafe this.siteStyle}}
+        @icon="circle"
+        @translatedLabel={{@colorPalette.name}}
+        @action={{this.paletteSelected}}
+      />
+    </div>
+  </template>
+}

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

@@ -0,0 +1,210 @@
+import Component from "@glimmer/component";
+import { tracked } from "@glimmer/tracking";
+import { action } from "@ember/object";
+import { service } from "@ember/service";
+import { isEmpty } from "@ember/utils";
+import { Promise } from "rsvp";
+import concatClass from "discourse/helpers/concat-class";
+import icon from "discourse/helpers/d-icon";
+import { reload } from "discourse/helpers/page-reloader";
+import { ajax } from "discourse/lib/ajax";
+import {
+  listColorSchemes,
+  updateColorSchemeCookie,
+} from "discourse/lib/color-scheme-picker";
+import cookie from "discourse/lib/cookie";
+import DMenu from "float-kit/components/d-menu";
+import UserColorPaletteMenuItem from "./user-color-palette-menu-item";
+
+const HORIZON_PALETTES = [
+  "Horizon",
+  "Marigold",
+  "Violet",
+  "Lily",
+  "Clover",
+  "Royal",
+];
+
+export default class UserColorPaletteSelector extends Component {
+  @service currentUser;
+  @service keyValueStore;
+  @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) => {
+        return {
+          ...userPalette,
+          accent: `#${
+            userPalette.colors.find((color) => color.name === "tertiary").hex
+          }`,
+        };
+      })
+      .filter((userPalette) => {
+        return HORIZON_PALETTES.some((palette) => {
+          return userPalette.name.toLowerCase().includes(palette.toLowerCase());
+        });
+      })
+      .sort();
+
+    // Match the light scheme with the corresponding dark id based in the name
+    return (
+      availablePalettes
+        ?.map((palette) => {
+          if (palette.is_dark) {
+            return palette;
+          }
+
+          const normalizedLightName = palette.name.toLowerCase();
+
+          const correspondingDarkModeId = availablePalettes.find(
+            (item) =>
+              item.is_dark &&
+              normalizedLightName ===
+                item.name.toLowerCase().replace(/\s+dark$/, "")
+          )?.id;
+
+          return {
+            ...palette,
+            correspondingDarkModeId,
+          };
+        })
+        // Only want to show palettes that have corresponding light/dark modes
+        .filter((palette) => !palette.is_dark)
+    );
+  }
+
+  get selectedColorPaletteId() {
+    if (this.currentUser) {
+      return this.userColorPaletteId;
+    }
+
+    return this.anonColorPaletteId;
+  }
+
+  @action
+  onRegisterMenu(api) {
+    this.dMenu = api;
+  }
+
+  @action
+  paletteSelected(selectedPalette) {
+    if (selectedPalette.id === this.selectedColorPaletteId) {
+      return;
+    }
+
+    this.#updatePreference(selectedPalette);
+    this.#changeSiteColorPalette(selectedPalette);
+    this.dMenu.close();
+  }
+
+  #updatePreference(selectedPalette) {
+    updateColorSchemeCookie(selectedPalette.id);
+    updateColorSchemeCookie(selectedPalette.correspondingDarkModeId, {
+      dark: true,
+    });
+
+    if (!this.currentUser) {
+      this.anonColorPaletteId = selectedPalette.id;
+    } else {
+      this.userColorPaletteId = selectedPalette.id;
+    }
+  }
+
+  #loadAnonColorPalette() {
+    const storedAnonPaletteId = cookie("color_scheme_id");
+    if (storedAnonPaletteId) {
+      return parseInt(storedAnonPaletteId, 10);
+    }
+  }
+
+  async #changeSiteColorPalette(colorPalette) {
+    this.cssLoaded = false;
+
+    const lightPaletteId = colorPalette.id;
+    const darkPaletteId = colorPalette.correspondingDarkModeId;
+    const darkTag = document.querySelector("link.dark-scheme");
+
+    // TODO(osama) once we have built-in light/dark modes for each palette, we
+    // can stop making the 2nd ajax call for the dark palette and replace it
+    // with a include_dark_scheme param on the ajax call for the light
+    // palette which will include the href for the dark palette in the response
+    if (!darkTag) {
+      reload();
+      return;
+    }
+
+    const lightPaletteInfo = await ajax(
+      `/color-scheme-stylesheet/${lightPaletteId}/${colorPalette.theme_id}.json`
+    );
+    const darkPaletteInfo = await ajax(
+      `/color-scheme-stylesheet/${darkPaletteId}/${colorPalette.theme_id}.json`
+    );
+
+    Promise.all([
+      this.#preloadAndSwapCSS(lightPaletteInfo.new_href, "light-scheme"),
+      this.#preloadAndSwapCSS(darkPaletteInfo.new_href, "dark-scheme"),
+    ]).then(() => {
+      this.cssLoaded = true;
+    });
+  }
+
+  #preloadAndSwapCSS(newHref, existingLinkClass) {
+    return new Promise((resolve) => {
+      const existingLink = document.querySelector(
+        `link[rel='stylesheet'].${existingLinkClass}`
+      );
+      const newTag = document.createElement("link");
+
+      newTag.rel = "preload";
+      newTag.href = newHref;
+      newTag.as = "style";
+      newTag.onload = () => {
+        existingLink.href = newHref;
+        newTag.remove();
+        resolve();
+      };
+
+      document.head.appendChild(newTag);
+    });
+  }
+
+  <template>
+    {{#unless (isEmpty this.userColorPalettes)}}
+      <DMenu
+        @identifier="user-color-palette-selector"
+        @placementStrategy="fixed"
+        @onRegisterApi={{this.onRegisterMenu}}
+        class={{concatClass
+          "btn-flat user-color-palette-selector sidebar-footer-actions-button"
+          (if this.cssLoaded "user-color-palette-css-loaded")
+        }}
+        data-selected-color-palette-id={{this.selectedColorPaletteId}}
+        @inline={{true}}
+      >
+        <:trigger>
+          {{icon "paintbrush"}}
+        </:trigger>
+        <:content>
+          <div class="user-color-palette-menu">
+            <div class="user-color-palette-menu__content">
+              {{#each this.userColorPalettes as |colorPalette|}}
+                <UserColorPaletteMenuItem
+                  @selectedColorPaletteId={{this.selectedColorPaletteId}}
+                  @colorPalette={{colorPalette}}
+                  @paletteSelected={{this.paletteSelected}}
+                />
+              {{/each}}
+            </div>
+          </div>
+        </:content>
+      </DMenu>
+    {{/unless}}
+  </template>
+}

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

@@ -0,0 +1,127 @@
+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";
+
+const TopicActivity = <template>
+  <td class="topic-activity-data">
+    <TopicActivityColumn @topic={{@topic}} />
+  </td>
+</template>;
+
+const TopicStatus = <template>
+  <td class="topic-status-data">
+    <TopicStatusColumn @topic={{@topic}} />
+  </td>
+</template>;
+
+const TopicCategory = <template>
+  <td class="topic-category-data">
+    <TopicCategoryColumn @topic={{@topic}} />
+  </td>
+</template>;
+
+const TopicLikesReplies = <template>
+  <td class="topic-likes-replies-data">
+    <TopicLikesColumn @topic={{@topic}} />
+    <TopicRepliesColumn @topic={{@topic}} />
+  </td>
+</template>;
+
+const TopicCreator = <template>
+  <td class="topic-creator-data">
+    <TopicCreatorColumn @topic={{@topic}} />
+  </td>
+</template>;
+
+export default {
+  name: "topic-list-customizations",
+
+  initialize(container) {
+    const router = container.lookup("service:router");
+    withPluginApi("1.39.0", (api) => {
+      api.registerValueTransformer(
+        "topic-list-columns",
+        ({ value: columns }) => {
+          columns.add("topic-status", {
+            item: TopicStatus,
+            after: "topic-author",
+          });
+          columns.add("topic-category", {
+            item: TopicCategory,
+            after: "topic-status",
+          });
+
+          columns.add("topic-likes-replies", {
+            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")) {
+            columns.add("topic-activity", {
+              item: TopicActivity,
+              after: "title",
+            });
+            columns.delete("posters");
+            columns.delete("activity");
+          }
+          return columns;
+        }
+      );
+
+      api.registerValueTransformer(
+        "topic-list-item-class",
+        ({ value: classes, context }) => {
+          if (
+            context.topic.is_hot ||
+            context.topic.pinned ||
+            context.topic.pinned_globally
+          ) {
+            classes.push("--has-status-card");
+          }
+          return classes;
+        }
+      );
+
+      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

@@ -1,5 +1,8 @@
 en:
   theme_metadata:
-    description: ''
-    settings:
-      example_setting: A description of a setting.
+    description: "A simple, beautiful theme that improves the out of the box experience for Discourse sites."
+  topic_pinned: "Pinned"
+  topic_hot: "Hot"
+  user_replied: "replied"
+  user_posted: "posted"
+  user_updated: "updated"

mobile/mobile.scss

@@ -1,3 +0,0 @@
-#main-outlet-wrapper {
-  padding: 0;
-}

package.json

@@ -1,10 +1,11 @@
 {
   "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": ">= 22",

scss/box-view.scss

@@ -1,28 +1,66 @@
-@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);
   }
 }
+
+.chat-drawer-active.chat-drawer-expanded {
+  .experimental-screen {
+    &__top-left,
+    &__top-right,
+    &__bottom-left,
+    &__bottom-right,
+    &__bottom-bar {
+      z-index: 199;
+    }
+  }
+}
+
+.has-full-page-chat .chat-replying-indicator-container {
+  margin-bottom: var(--main-grid-gap);
+
+  @include viewport.until(lg) {
+    margin-bottom: 0;
+  }
+}
+
+.has-full-page-chat .chat-selection-management {
+  margin-bottom: var(--main-grid-gap);
+
+  @include viewport.until(lg) {
+    margin-bottom: 0;
+  }
+}
+
 .experimental-screen {
   max-width: unset !important;
-  .has-full-page-chat & {
-    display: none;
-  }
-  @media screen and (max-width: 488px) {
-    display: none;
-  }
   width: 100%;
   display: block;
   margin: 0;
   padding: 0;
   position: relative;
-  container: content-width / inline-size;
+
+  @include viewport.until(lg) {
+    display: none;
+  }
+
+  @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,
@@ -30,81 +68,97 @@
     position: fixed;
     width: var(--d-border-radius-large);
     height: var(--d-border-radius-large);
-    background-color: var(--secondary);
-    z-index: 999;
-    -webkit-mask: radial-gradient(
+    background-color: var(--background-color);
+    z-index: 399;
+    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: calc(var(--main-grid-gap) + var(--d-sidebar-width));
-    @media screen and (max-width: 768px) {
-      left: var(--main-grid-gap);
-    }
+    left: var(--left-distance);
   }
+
   &__top-right {
     top: var(--header-offset);
     transform: rotate(90deg);
-    @container content-width (width > 1px) {
-      left: calc(
-        var(--main-grid-gap) + var(--d-sidebar-width) + 100cqw -
-          var(--d-border-radius-large)
-      );
-      @media screen and (max-width: 768px) {
-        left: calc(
-          var(--main-grid-gap) + 100cqw - var(--d-border-radius-large)
-        );
-      }
-    }
+    left: calc(var(--right-distance) - var(--d-border-radius-large));
   }
+
   &__bottom-left {
     transform: rotate(-90deg);
-    bottom: var(--d-border-radius-large);
-    left: calc(var(--main-grid-gap) + var(--d-sidebar-width));
-    @media screen and (max-width: 768px) {
-      left: var(--main-grid-gap);
+    bottom: var(--main-grid-gap);
+    left: var(--left-distance);
+
+    @media screen and (width <= 768px) {
       bottom: calc(var(--d-border-radius-large) * 2);
     }
   }
+
   &__bottom-right {
     transform: rotate(180deg);
-    bottom: var(--d-border-radius-large);
-    @container content-width (width > 1px) {
-      left: calc(
-        var(--main-grid-gap) + var(--d-sidebar-width) + 100cqw -
-          var(--d-border-radius-large)
-      );
-      @media screen and (max-width: 768px) {
-        left: calc(
-          var(--main-grid-gap) + 100cqw - var(--d-border-radius-large)
-        );
-        bottom: calc(var(--d-border-radius-large) * 2);
-      }
+    bottom: var(--main-grid-gap);
+    left: calc(var(--right-distance) - var(--d-border-radius-large));
+
+    @media screen and (width <= 768px) {
+      bottom: calc(var(--d-border-radius-large) * 2);
     }
   }
+
   &__bottom-bar {
     position: fixed;
     width: 100%;
-    z-index: 999;
-    background-color: var(--secondary);
+    z-index: 399;
+    background-color: var(--background-color);
     bottom: 0;
-    left: calc(var(--main-grid-gap) + var(--d-sidebar-width));
-    @media screen and (max-width: 768px) {
-      left: var(--main-grid-gap);
+    left: var(--left-distance);
+    height: var(--main-grid-gap);
+
+    @media screen and (width <= 768px) {
       height: calc(var(--d-border-radius-large) * 2);
     }
-    height: var(--d-border-radius-large);
+
     @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) +
@@ -113,7 +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) +
@@ -122,7 +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

@@ -6,132 +6,105 @@
   transition: none;
 }
 
-.btn-default,
-.btn-primary,
-.btn-danger,
-.select-kit .select-kit-header {
-  padding: var(--spacing-block-s) var(--spacing-inline-m);
-  // font-size: var(--font-up-1-rem);
-  // border-radius: var(--d-button-border-radius);
-
-  &.no-text {
-    padding-inline: 0.665rem;
-  }
-}
-
 .sidebar-new-topic-button__wrapper .topic-drafts-menu-trigger.btn.no-text {
   background: var(--accent-color);
-  &:hover {
-    background: radial-gradient(
-        90% 110% at 50% 50%,
-        rgba(255, 255, 255, 0.3) 0%,
-        rgba(255, 255, 255, 0) 100%
-      ),
-      var(--accent-color);
+
+  &:hover,
+  &:focus-visible {
+    background: oklch(from var(--accent-color) 40% c h) !important;
+    box-shadow: none;
   }
-  svg {
-    color: var(--secondary);
+
+  .d-icon {
+    color: var(--accent-text-color);
   }
 }
 
-.btn-default,
-.select-kit .select-kit-header {
-  border: 1px solid var(--accent-color);
-  //id like to use rgba of the accent colour but how to derive that?
-  // box-shadow: 0px 0px 8px 2px oklch(from (var(--accent-color)) calc(l * 2) calc(c * 0.125) h);
-  background: var(--secondary);
+.discourse-no-touch .dropdown-menu__item .btn {
+  background: transparent;
+}
+
+.discourse-no-touch .btn-default.sidebar-new-topic-button,
+.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 {
-    .discourse-no-touch & {
-      border: 1px solid transparent;
-      box-shadow: 0px 0px 8px 2px rgba(0, 0, 0, 0.1);
-      background: var(--secondary);
+    border-color: transparent;
+    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);
-      .d-icon {
-        color: var(--accent-color);
-      }
     }
   }
+
   &:focus-visible {
-    .discourse-no-touch & {
-      background: var(--secondary);
+    background: var(--d-content-background);
+    color: var(--accent-color);
+    box-shadow: 0 0 0 3px var(--button-box-shadow);
+
+    .d-icon {
       color: var(--accent-color);
-      box-shadow: 0px 0px 0px 2px var(--secondary),
-        0px 0px 0px 4px var(--accent-color);
-      .d-icon {
-        color: var(--accent-color);
-      }
-    }
-  }
-}
-//not shared with select-kit
-.btn-default {
-  &:active {
-    .discourse-no-touch & {
-      color: var(--secondary);
-      background: oklch(from var(--accent-color) 30% c h) !important;
-      .d-icon {
-        color: var(--secondary);
-      }
+    }
+  }
+
+  &:active:not(:hover, :focus) {
+    color: var(--primary);
+    background: var(--tertiary-300);
+    background-image: none;
+
+    .d-icon {
+      color: var(--tertiary-high);
     }
   }
 }
+
 .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: radial-gradient(
-          90% 110% at 50% 50%,
-          rgba(255, 255, 255, 0.3) 0%,
-          rgba(255, 255, 255, 0) 100%
-        ),
-        var(--accent-color);
-      box-shadow: 0px 0px 6px 1px rgba(0, 0, 0, 0.15);
+      background: light-dark(
+        oklch(from var(--accent-color) 40% c h),
+        oklch(from var(--accent-color) 50% c h)
+      );
+      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: radial-gradient(
-          90% 110% at 50% 50%,
-          rgba(255, 255, 255, 0.3) 0%,
-          rgba(255, 255, 255, 0) 100%
-        ),
-        var(--accent-color);
-      box-shadow: 0px 0px 0px 2px var(--secondary),
-        0px 0px 0px 4px var(--accent-color);
+      background: light-dark(
+        oklch(from var(--accent-color) 40% c h),
+        oklch(from var(--accent-color) 50% c h)
+      );
+      box-shadow: 0 0 0 4px var(--button-box-shadow);
+      color: var(--accent-text-color);
     }
   }
+
   &:active {
-    .discourse-no-touch & {
-      // background: radial-gradient(
-      //     65% 95% at 50% 50%,
-      //     rgba(0, 0, 0, 0.4) 0%,
-      //     rgba(0, 0, 0, 0) 100%
-      //   ),
-      //   var(--accent-color) !important;
-      background: oklch(from var(--accent-color) 30% c h) !important;
-    }
+    background: light-dark(
+      oklch(from var(--accent-color) 40% c h),
+      oklch(from var(--accent-color) 50% c h)
+    );
   }
 }
-
-.post-controls {
-  svg.d-icon {
-    color: inherit !important; //something we should honestly implement in core imo, when do we ever NOT want the same colour for icon and text?
-  }
-}
-
-//undoing the outline for select-kit, since Im using a custom visual cue
-.select-kit.single-select.is-expanded .select-kit-header:not(.btn),
-.select-kit.single-select .select-kit-header:not(.btn):focus,
-.select-kit.single-select .select-kit-header:not(.btn):active {
-  outline: transparent;
-  border-color: var(--accent-color);
-}

scss/chat.scss

@@ -1,15 +1,88 @@
+@use "lib/viewport";
+
 .full-page-chat.full-page-chat-sidebar-enabled {
-  border-top-left-radius: var(--d-border-radius-large);
-  box-shadow: 0px 0px 1px 2px #e2e8f8, 0px 0px 24px 4px #e2e8f8;
   border: none;
 }
 
-.has-full-page-chat .d-header {
-  background-color: transparent;
-}
-
 .c-navbar-container {
-  border-top-left-radius: var(--d-border-radius-large);
-  padding: 0 1.5rem;
+  .full-page-chat & {
+    padding: 0 1.5em;
+  }
   background-color: var(--d-content-background);
 }
+
+body.has-full-page-chat {
+  background-color: var(--background-color);
+}
+
+.chat-drawer-container {
+  .is-expanded & {
+    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);
+  }
+}
+
+.channel-title {
+  font-weight: bold;
+  text-transform: uppercase;
+  font-size: var(--font-down-1);
+}
+
+.chat-composer__wrapper {
+  background: var(--d-content-background);
+}
+
+.chat-message-actions .more-buttons .btn-icon-text {
+  &:hover {
+    background-color: var(--d-selected);
+    box-shadow: none;
+    color: var(--primary);
+  }
+}
+
+.chat-drawer-active.chat-drawer-expanded .chat-composer-dropdown__menu-content {
+  z-index: z("modal", "dialog");
+}
+
+.chat-replying-indicator-container {
+  @include viewport.from(sm) {
+    margin-left: calc(0.65em + 0.2rem);
+  }
+}

scss/color-choice.scss

@@ -0,0 +1,29 @@
+.user-color-palette-menu {
+  &__item .btn-icon-text.btn-flat {
+    background-color: var(--d-content-background);
+    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);
+  }
+}
+
+.user-color-palette-content .fk-d-menu__inner-content {
+  border: none;
+}

scss/color-exploration.scss

@@ -0,0 +1,26 @@
+:root {
+  --d-sidebar-highlight-hover-icon: var(--d-sidebar-link-color);
+  --d-sidebar-highlight-hover-background: var(--d-selected);
+  --d-sidebar-link-icon-color: var(--d-sidebar-link-color);
+  --d-sidebar-header-color: var(--d-sidebar-link-color);
+  --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: 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),
+    oklch(from var(--d-selected) calc(l * 0.7) c h)
+  );
+  --d-sidebar-highlight-prefix-background: light-dark(
+    oklch(from var(--d-selected) calc(l * 0.85) c h),
+    oklch(from var(--d-selected) calc(l * 0.7) c h)
+  );
+  --d-sidebar-highlight-suffix-color: var(--d-sidebar-active-suffix-color);
+  --d-sidebar-highlight-color: var(--primary);
+  --d-sidebar-highlight-background: var(--d-selected);
+  --d-sidebar-section-link-icon-size: 1em;
+  --d-hover: oklch(from var(--d-selected) l c h / 0.75);
+  --d-input-bg-color: var(--d-content-background);
+  --d-sidebar-active-color: var(--primary) !important;
+}

scss/composer-peek-mode.scss

@@ -0,0 +1,65 @@
+.peek-mode-toggle {
+  display: none;
+}
+
+@media screen and (width >= 1300px) {
+  html:not(.fullscreen-composer) {
+    .peek-mode-toggle svg {
+      transform: scaleX(-1);
+    }
+
+    &.composer-open {
+      .full-width-enabled .peek-mode-toggle {
+        display: flex;
+      }
+
+      .full-width-enabled.peek-mode-active {
+        #reply-control.hide-preview {
+          transition: none;
+          box-shadow: none;
+          border-radius: var(--d-border-radius-large);
+
+          .grippie {
+            display: none;
+          }
+
+          .reply-area {
+            padding-inline: 0.67em;
+          }
+        }
+
+        #reply-control:not(.fullscreen).hide-preview {
+          width: 100%;
+          right: var(--main-grid-gap);
+          top: var(--header-offset);
+          bottom: var(--main-grid-gap);
+          left: unset;
+          height: unset;
+          max-width: 36.5vw;
+        }
+
+        &.has-sidebar-page {
+          #main-outlet-wrapper {
+            grid-template-columns:
+              var(--d-sidebar-width) calc(100vw - 38vw - var(--d-sidebar-width))
+              1fr;
+          }
+        }
+
+        &:not(.has-sidebar-page) {
+          #main-outlet-wrapper {
+            grid-template-columns: 0 calc(100vw - 52vw) 1fr;
+          }
+
+          #reply-control:not(.fullscreen).hide-preview {
+            max-width: 46vw;
+          }
+        }
+
+        .sidebar-wrapper .sidebar-container {
+          height: unset;
+        }
+      }
+    }
+  }
+}

scss/composer.scss

@@ -0,0 +1,121 @@
+@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);
+    }
+  }
+}
+
+#reply-control.hide-preview:not(.draft) {
+  @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,
+    .title-and-category {
+      padding: 0 var(--spacing-inline-m);
+      width: calc(100% - var(--spacing-inline-m) * 2);
+    }
+
+    .d-editor-button-bar {
+      padding: 3px var(--spacing-inline-m);
+      border: none;
+    }
+
+    .d-editor-input {
+      padding: var(--spacing-inline-m);
+    }
+
+    &:has(.in-focus) .grippie {
+      background: var(--tertiary);
+    }
+
+    .reply-area {
+      padding-inline: 0;
+    }
+
+    .reply-to,
+    .submit-panel {
+      padding-inline: var(--spacing-inline-sm);
+    }
+
+    .d-editor-textarea-wrapper {
+      border: 0;
+      border-bottom: 1px solid var(--primary-low);
+      border-radius: 0;
+
+      &.in-focus {
+        outline: 0;
+      }
+    }
+  }
+}
+
+.d-editor-button-bar {
+  .btn:hover,
+  .toolbar-popup-menu-options.is-expanded {
+    .discourse-no-touch & {
+      background: var(--tertiary-very-low);
+      color: var(--accent-color);
+
+      .d-icon {
+        color: inherit;
+      }
+
+      // 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);
+          }
+        }
+      }
+    }
+  }
+
+  .toolbar-popup-menu-options.is-expanded {
+    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

@@ -0,0 +1,276 @@
+@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.
+//
+// We are copying this here so we can continue to iterate on Horizon with full
+// width without having to include the theme component as a dependency, we
+// need to remove this once full width is in core.
+
+$sidebar-width: 17em;
+
+.wrap {
+  max-width: unset; // undoing core default
+}
+
+.d-header #site-logo {
+  // 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 {
+  padding: 0;
+
+  body.has-sidebar-page & {
+    .sidebar-wrapper {
+      width: var(--d-sidebar-width);
+    }
+  }
+
+  body.has-full-page-chat & {
+    gap: 0;
+  }
+
+  .sidebar-wrapper {
+    width: 100%; // safari has issues without this
+  }
+
+  #main-outlet {
+    margin: 0 auto;
+    max-width: var(--d-max-width);
+    width: 100%;
+
+    body.has-full-page-chat & {
+      max-width: unset;
+    }
+  }
+}
+
+.has-full-page-chat:not(.discourse-sidebar) .full-page-chat {
+  border: none;
+}
+
+#main-outlet > .regular {
+  max-width: var(--d-max-width);
+  margin: 0 auto;
+
+  body.has-sidebar-page & {
+    margin: 0 auto;
+  }
+}
+
+.d-header .title:not(.title--minimized) {
+  // allowing overflow here isn't always ideal
+  // but works well enough most of the time
+  overflow: visible;
+}
+
+.d-header {
+  > .wrap {
+    .contents {
+      display: grid;
+      grid-template-areas: "logo lspace extra-info rspace panel";
+      grid-template-columns:
+        minmax(auto, 1fr)
+        auto
+        minmax(0, calc(var(--d-max-width)))
+        auto
+        minmax(auto, 1fr);
+
+      .d-header-mode {
+        grid-area: extra-info;
+        white-space: nowrap;
+
+        @include viewport.until(md) {
+          display: none;
+        }
+      }
+
+      .d-header .title {
+        min-width: auto;
+      }
+
+      .has-sidebar-page & {
+        // at wide widths, when 1fr > 0
+        // we want the panel to be the same width as the sidebar
+        // this way we can get more accurate centering
+        grid-template-columns:
+          calc(var(--d-sidebar-width) - 11px) // 11px is wrap padding
+          1fr
+          minmax(0, calc(var(--d-max-width)))
+          1fr
+          minmax(0, calc(var(--d-sidebar-width) - 11px));
+        gap: 1em;
+
+        // 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 (width <= 1400px) {
+          grid-template-columns:
+            calc(var(--d-sidebar-width) - 11px)
+            1fr
+            minmax(0, calc(var(--d-max-width)))
+            1fr
+            auto;
+        }
+
+        @media screen and (width <= 1000px) {
+          gap: 0.5em;
+        }
+
+        .d-header-mode {
+          grid-area: extra-info;
+        }
+      }
+    }
+  }
+
+  .header-sidebar-toggle {
+    grid-area: logo;
+  }
+
+  .before-header-panel-outlet {
+    grid-area: extra-info;
+  }
+
+  .d-header-mode {
+    .bootstrap-mode {
+      display: none;
+    }
+  }
+
+  .home-logo-wrapper-outlet {
+    grid-area: logo;
+    margin-left: 3.7em; // 2.7em hamburger width + 1em for margin
+    margin-right: 0.725em;
+    display: flex;
+    overflow: visible;
+
+    .title {
+      flex: 1 1 auto;
+    }
+  }
+
+  .panel {
+    grid-area: panel;
+  }
+}
+
+.extra-info-wrapper {
+  grid-area: extra-info;
+  max-width: var(--d-max-width);
+  width: 100%;
+  box-sizing: border-box;
+  padding: 0;
+}
+
+.header-search--enabled .floating-search-input-wrapper {
+  grid-area: extra-info;
+
+  @include viewport.until(md) {
+    grid-area: rspace;
+  }
+
+  @include viewport.until(sm) {
+    display: none;
+  }
+}
+
+body.has-sidebar-page {
+  .wrap {
+    max-width: unset; // undoing core default
+  }
+
+  .d-header-mode,
+  .extra-info-wrapper {
+    padding: 0;
+  }
+
+  @media screen and (width >= calc($reply-area-max-width + ($sidebar-width * 2))) {
+    #reply-control.show-preview {
+      margin-left: auto;
+      margin-right: auto;
+    }
+
+    .sidebar-container {
+      height: auto;
+    }
+  }
+
+  @media screen and (width <= calc($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;
+
+      // overruling new core composer changes
+      max-width: $reply-area-max-width;
+      transform: none;
+    }
+
+    .sidebar-container {
+      height: auto;
+    }
+  }
+
+  // overruling new core composer changes
+  @media screen and (min-width: $reply-area-max-width) {
+    #reply-control.show-preview:not(.fullscreen) {
+      max-width: $reply-area-max-width;
+      transform: none;
+    }
+  }
+}
+
+body.sidebar-animate {
+  #main-outlet-wrapper {
+    transition: none;
+  }
+
+  .d-header-wrap .wrap {
+    transition: none;
+  }
+}
+
+.d-header-icons {
+  display: flex;
+}
+
+.rtl {
+  .d-header .title {
+    margin-right: 3.7em; // 2.7em hamburger width + 1em for margin
+    margin-left: 0.725em;
+  }
+}
+
+// provides some extra space for login buttons
+@media screen and (width >= 1400px) {
+  .anon {
+    .d-header .panel {
+      grid-column-start: -4;
+    }
+  }
+}

scss/desktop-horizon-fixes.scss

@@ -0,0 +1,65 @@
+// Fixing bulk select (only needed for desktop)
+.bulk-select-enabled {
+  .topic-list-header {
+    position: relative;
+    top: 0;
+  }
+
+  .topic-author-avatar-data {
+    display: none;
+  }
+
+  .bulk-select.topic-list-data {
+    grid-area: bulk-select;
+    margin-left: -0.5em;
+
+    @media screen and (width <= 576px) {
+      margin-top: 0;
+
+      label {
+        padding-block: 0.345em;
+      }
+    }
+
+    input {
+      transform: scale(1.5);
+    }
+  }
+}
+
+.topic-list-header {
+  tr {
+    border: none;
+  }
+
+  .topic-list-data {
+    padding: 0;
+
+    &:not(.default) {
+      display: none;
+    }
+
+    &.default {
+      .bulk-select,
+      span:not(.bulk-select-topics, .d-button-label) {
+        display: none;
+      }
+    }
+  }
+
+  // bulk select
+  .bulk-select-topics {
+    position: absolute;
+    right: 0;
+    background: var(--secondary);
+    border-radius: 0 0 0 var(--d-border-radius);
+    display: flex;
+    gap: 0.5rem;
+    margin: 0.5rem;
+
+    button {
+      white-space: nowrap;
+      margin: 0;
+    }
+  }
+}

scss/header.scss

@@ -1,3 +1,90 @@
+@use "lib/viewport";
+
 .d-header {
   box-shadow: none;
+  background: var(--background-color);
+
+  @include viewport.from(xl) {
+    padding-bottom: var(--main-grid-gap);
+  }
+}
+
+.user-menu .quick-access-panel,
+.user-notifications-list {
+  li {
+    &.pending,
+    &.unread {
+      background: var(--d-hover);
+
+      .discourse-no-touch & {
+        &:hover,
+        &:focus {
+          background: var(--d-selected);
+        }
+      }
+    }
+  }
+}
+
+.user-menu.revamped .tabs-list .btn.active {
+  background: var(--d-hover);
+}
+
+.discourse-no-touch .d-header-icons .icon:hover,
+.discourse-no-touch .d-header-icons .icon:focus,
+.header-sidebar-toggle button:focus:hover,
+.discourse-no-touch .header-sidebar-toggle button:hover {
+  background-color: transparent;
+}
+
+.discourse-no-touch .d-header-icons .icon:hover > .d-icon,
+.drop-down-mode .d-header-icons .active .icon > .d-icon,
+.drop-down-mode
+  .d-header-icons
+  .header-color-scheme-toggle
+  .-expanded
+  > .d-icon,
+.discourse-no-touch .header-sidebar-toggle button:hover .d-icon {
+  color: var(--header_primary-medium);
+}
+
+.discourse-no-touch .interface-color-selector-content {
+  border: none;
+  border-radius: var(--d-border-radius);
+
+  .btn {
+    border: none;
+
+    &:hover {
+      box-shadow: none;
+    }
+  }
+}
+
+.drop-down-mode .d-header-icons .active .icon,
+.drop-down-mode .d-header-icons .header-color-scheme-toggle .-expanded {
+  border-color: transparent;
+  background-color: transparent;
+}
+
+.badge-notification {
+  color: var(--accent-text-color);
+}
+
+body.login-page,
+body.signup-page,
+body.invite-page,
+body.password-reset-page,
+body.activate-account-page {
+  .d-header {
+    background: var(--background-color);
+  }
+}
+
+.header-dropdown-toggle.chat-header-icon .icon .chat-channel-unread-indicator {
+  border-color: var(--background-color);
+}
+
+.d-header-icons .badge-notification {
+  border-color: var(--background-color);
 }

scss/hiddenstuff.scss

@@ -1,8 +1,9 @@
 .sidebar__panel-switch-button,
-.sidebar-section[data-section-name="messages"],
 .list-controls #create-topic,
 .notifications-button-footer .reason .text,
 .pinned-button .reason .text,
-.more-topics__browse-more {
+.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 {
   display: none;
 }

scss/login.scss

@@ -0,0 +1,15 @@
+body.static-login {
+  #main-outlet-wrapper {
+    grid-template-areas:
+      "sidebar blank"
+      "sidebar content"
+      "sidebar below-content";
+    grid-template-rows: auto 1fr auto;
+  }
+
+  .login-welcome {
+    border-radius: none;
+    border: none;
+    box-shadow: none;
+  }
+}

scss/main.scss

@@ -1,66 +1,121 @@
-html:not(:has(.has-full-page-chat)) {
-  background-color: #f5f8ff;
-}
+@use "lib/viewport";
 
 :root {
-  --main-grid-gap: 2em;
+  --main-grid-gap: 0.5em;
 }
 
-body:not(.has-full-page-chat) {
-  background-color: #f5f8ff;
+html:not(:has(.has-full-page-chat)) {
+  background-color: var(--background-color);
+
+  @include viewport.until(sm) {
+    background-color: var(--d-content-background);
+  }
+}
+
+body {
+  -webkit-font-smoothing: antialiased;
+
+  @include viewport.until(sm) {
+    background-color: var(--d-content-background);
+  }
+}
+
+#main-outlet-wrapper {
+  gap: var(--main-grid-gap);
+}
+
+body.has-sidebar-page.has-full-page-chat #main-outlet-wrapper {
+  grid-column-gap: var(--main-grid-gap);
+  background-color: var(--background-color);
+}
+
+body.has-full-page-chat:not(.has-sidebar-page) {
+  .d-header {
+    background-color: var(--background-color);
+  }
+
   #main-outlet-wrapper {
-    // margin-top: 1.5rem;
-    @media screen and (max-width: 485px) {
+    gap: var(--main-grid-gap);
+
+    @include viewport.until(lg) {
+      gap: 0;
+    }
+  }
+}
+
+body.has-sidebar-page #main-outlet-wrapper {
+  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 viewport.from(lg) {
+    grid-template-columns: 0 minmax(0, 1fr) 0;
+  }
+}
+
+body:not(.has-full-page-chat, .wizard) {
+  @include viewport.from(xl) {
+    background-color: var(--background-color);
+  }
+
+  #main-outlet-wrapper {
+    @include viewport.until(lg) {
       --main-grid-gap: 0;
     }
-    gap: var(--main-grid-gap);
-    // height: calc(100vh - var(--header-offset) - 4rem);
-    // box-sizing: border-box;
-    // > * {
-    // height: inherit;
-    // box-sizing: border-box;
-    // }
+
+    @media screen and (width >= 768px) {
+      gap: var(--main-grid-gap);
+    }
+
     #main-outlet {
       width: 100%;
-      // height: inherit;
-      // overflow: scroll;
-      // &:has(.list-controls) {
-      // padding-top: 0;
-      // }
-      // &:has(#topic-title) {
-      // padding-top: 0;
-      // }
-      > *:not(.full-page-chat) {
-        max-width: 1000px;
-        margin-inline: auto;
-        padding-inline: 1.5em;
-        @media screen and (max-width: 425px) {
-          padding-inline: 0.5em;
+      max-width: unset;
+      padding-bottom: var(--spacing-block-l);
+      border-radius: var(--d-border-radius-large);
+      background-color: var(--d-content-background);
+
+      @include viewport.until(lg) {
+        border-radius: 0;
+      }
+
+      html.composer-open & {
+        padding-bottom: var(--composer-height);
+      }
+
+      > *:not(.experimental-screen, .activate-account) {
+        @include viewport.from(lg) {
+          box-sizing: border-box;
+          max-width: 1000px;
+          margin-inline: auto;
+          padding-inline: var(--spacing-inline-l);
         }
       }
-      // border-radius: var(--d-border-radius-large);
-      // border-radius: 1.25rem;
-      // .navigation-topics & {
-      //   background: radial-gradient(
-      //       100.59% 70.87% at 41.19% 73.28%,
-      //       rgba(188, 241, 238, 0.2) 0%,
-      //       rgba(255, 255, 255, 0) 100%
-      //     ),
-      //     radial-gradient(
-      //       67.07% 61.36% at 66.47% 64.15%,
-      //       rgba(162, 164, 225, 0.2) 0%,
-      //       rgba(255, 255, 255, 0) 100%
-      //     ),
-      //     #fff;
-      // }
-      // box-shadow: 0px 0px 1px 2px #e2e8f8, 0px 0px 24px 4px #e2e8f8;
-      background-color: var(--d-content-background);
+    }
+  }
+}
+
+#list-area {
+  .show-more.has-topics {
+    @include viewport.from(lg) {
+      width: auto;
+      right: 50%;
+      transform: translateX(50%);
+
+      .alert {
+        padding: var(--spacing-block-sm) var(--spacing-inline-m);
+        border-radius: var(--d-border-radius-large);
+        font-size: var(--font-down-1-rem);
+      }
     }
   }
 
-  // .global-notice {
-  //   margin-top: var(--spacing-block-m);
-  // }
+  .topic-list-body {
+    padding-top: var(--spacing-block-m);
+  }
 }
 
 aside.onebox {
@@ -68,8 +123,16 @@ aside.onebox {
 }
 
 .d-editor-preview-wrapper {
-  box-shadow: 0px 0px 1px 2px #e2e8f8, 0px 0px 24px 4px #e2e8f8;
-  border-radius: var(--d-border-radius-large);
+  border-radius: var(--d-border-radius);
   padding: 1em;
   background-color: var(--d-content-background);
 }
+
+.no-ember {
+  #main-outlet {
+    border-radius: var(--d-border-radius-large);
+    margin: 0 var(--main-grid-gap) var(--main-grid-gap) var(--main-grid-gap);
+    padding: 2em;
+    max-height: calc(100vh - 50px - 1em - var(--main-grid-gap));
+  }
+}

scss/misc.scss

@@ -1,3 +1,5 @@
+@use "lib/viewport";
+
 .user-main .about.collapsed-info .details {
   background: var(--d-content-background);
 }
@@ -8,7 +10,7 @@
 }
 
 .powered-by-discourse {
-  z-index: 9999;
+  z-index: 400;
 }
 
 .boxed.white {
@@ -40,6 +42,100 @@
   border-radius: 0;
 }
 
-.d-editor-button-bar {
-  padding: 3px;
+.open .grippie {
+  background-color: var(--accent-color);
+}
+
+.d-editor-textarea-wrapper.in-focus,
+input[type="text"]:focus,
+input[type="password"]:focus,
+input[type="datetime"]:focus,
+input[type="datetime-local"]:focus,
+input[type="date"]:focus,
+input[type="month"]:focus,
+input[type="time"]:focus,
+input[type="week"]:focus,
+input[type="number"]:focus,
+input[type="email"]:focus,
+input[type="url"]:focus,
+input[type="search"]:focus,
+input[type="tel"]:focus,
+input[type="color"]:focus,
+.select-kit.multi-select.is-expanded .multi-select-header,
+.select-kit.multi-select .multi-select-header:focus {
+  border-color: var(--accent-color);
+  outline: 2px solid var(--accent-color);
+}
+
+#reply-control {
+  background-color: var(--background-color);
+}
+
+@include viewport.until(sm) {
+  // pinned topic excerpts are hidden on small screens too
+  .fk-d-menu__trigger.topic-list-layout-trigger {
+    display: none;
+  }
+}
+
+.search-container .search-header,
+.search-container .search-bar,
+.search-container .search-filters,
+.search-container .search-filters .search-advanced-filters {
+  background-color: var(--d-content-background);
+}
+
+.user-main .about .details {
+  padding: 1em 1em 0;
+  border-bottom: 0;
+  border-radius: var(--d-border-radius);
+  background-color: var(--primary-50);
+}
+
+.alert.alert-info {
+  background: var(--tertiary-very-low);
+}
+
+.discourse-reactions-list .reactions {
+  gap: 0.15em;
+}
+
+.group-details-container {
+  border-radius: var(--d-border-radius);
+}
+
+.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

@@ -0,0 +1,243 @@
+@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 viewport.until(sm) {
+      padding: 0;
+    }
+  }
+}
+
+#main-outlet {
+  @include viewport.until(sm) {
+    padding-top: var(--spacing-block-sm);
+  }
+
+  .list-controls {
+    @include viewport.until(sm) {
+      padding-inline: var(
+        --spacing-inline-m
+      ) !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 viewport.until(sm) {
+        gap: var(--spacing-inline-s);
+
+        .category-breadcrumb.hidden,
+        .category-breadcrumb {
+          display: flex !important;
+          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);
+          }
+        }
+
+        .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 horizontal alignment
+
+          &:has(#create-topic) {
+            order: 1;
+          }
+        }
+      }
+
+      #navigation-bar,
+      .navigation-controls,
+      .category-breadcrumb {
+        @include viewport.until(sm) {
+          margin-bottom: 0;
+        }
+      }
+
+      .navigation-controls {
+        @include viewport.until(sm) {
+          gap: var(--spacing-inline-s);
+        }
+      }
+    }
+  }
+
+  .list-container {
+    @include viewport.until(sm) {
+      padding-inline: 0 !important;
+    }
+
+    .topic-list-body {
+      @include viewport.until(sm) {
+        border-top: 0;
+        padding-top: 0;
+      }
+    }
+  }
+
+  #topic-title {
+    @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
+      .badge-category__wrapper {
+        font-size: var(--font-down-2-rem);
+        border-radius: var(--d-border-radius);
+        padding: var(--spacing-inline-xs) var(--spacing-inline-s);
+        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)
+        );
+        border: 1px solid
+          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)
+          );
+      }
+
+      .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)
+        );
+      }
+
+      .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);
+        gap: var(--spacing-inline-xs);
+        border-radius: var(--d-border-radius-large);
+        border: 1px solid var(--primary-low-mid);
+        background: var(--secondary);
+      }
+    }
+  }
+
+  .container.posts {
+    @include viewport.until(sm) {
+      padding-inline: var(--spacing-inline-xs) !important;
+
+      .main-avatar .avatar {
+        width: 40px;
+        height: 40px;
+      }
+
+      .topic-body {
+        .topic-meta-data {
+          .username {
+            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
+        .topic-avatar {
+          padding-top: 0;
+          align-items: center;
+
+          .d-icon {
+            font-size: var(--font-up-1);
+          }
+        }
+      }
+    }
+  }
+
+  #topic-footer-buttons {
+    @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 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);
+    border: 1px solid var(--tertiary-low);
+  }
+}
+
+.mobile-device #reply-control.show-preview .submit-panel {
+  background-color: var(--background-color);
+}
+
+.d-editor-preview-wrapper {
+  outline: 2px solid var(--background-color);
+}

scss/nav-pills.scss

@@ -1,25 +1,64 @@
+@use "lib/viewport";
 .list-controls {
   position: sticky;
   top: var(--header-offset);
   background: var(--d-content-background);
-  z-index: 100;
-  padding: 1.5rem 0 1rem 0;
+  z-index: z("base");
+  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,
-  .discourse-post-event .discourse-post-event-widget {
-    // needs more specificy than just in the button file
+
+  .combo-box .combo-box-header {
+    // needs more specificity than just in the button file
     background-color: var(--secondary);
-    border: 1px solid var(--accent-color);
-    border-radius: var(--d-border-radius-large);
-    // font-size: var(--font-up-1-rem);
+    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: 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;
@@ -28,21 +67,23 @@
 
 .select-kit.is-expanded .select-kit-body {
   border-radius: var(--d-border-radius);
-  border: 1px solid var(--accent-color);
   background-color: var(--d-content-background);
 }
 
 .nav-pills > li > a:hover,
 .nav-pills > li button:hover {
-  background: transparent;
-  color: var(--accent-color);
-  &::after {
-    content: "";
-    position: absolute;
-    left: 0;
-    bottom: 0;
-    right: 0;
-    height: var(--d-nav-underline-height);
-    background: var(--accent-color);
+  .discourse-no-touch & {
+    background: transparent;
+    color: var(--d-nav-color--hover);
+
+    &::after {
+      content: "";
+      position: absolute;
+      left: 0;
+      bottom: 0;
+      right: 0;
+      height: var(--d-nav-underline-height);
+      background: var(--d-nav-color--hover);
+    }
   }
 }

scss/search-banner.scss

@@ -1,84 +0,0 @@
-.custom-search-banner-wrap {
-  display: grid;
-  grid-template-rows: 0.33fr 0.33fr 0.33fr;
-  grid-template-columns: 1fr 1fr;
-  grid-column-gap: 1em;
-  grid-row-gap: 0.5em;
-  border-bottom: 1px solid var(--primary-300);
-  padding: 1.5em 0 2.5em;
-  margin-bottom: 0;
-  --search-color: #595bca;
-  @media screen and (max-width: 900px) {
-    padding-bottom: 1em;
-  }
-  h1 {
-    grid-column: 1/2;
-    grid-row: 1/-1;
-    padding: 0 1em;
-    text-align: left;
-    align-self: center;
-    margin: 0;
-    font-weight: 400;
-    color: #350c73;
-    @media screen and (max-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) {
-      text-align: left;
-      grid-column: 1/2;
-      grid-row: 1/-1;
-      font-size: var(--font-up-3);
-    }
-    @media screen and (max-width: 600px) {
-      grid-column: 1/-1;
-      grid-row: 1;
-      text-align: center;
-      margin-bottom: 0.5em;
-    }
-  }
-  .search-menu {
-    grid-column: 2/3;
-    grid-row: 1/-1;
-    width: 100%;
-    align-self: center;
-    @media screen and (max-width: 1028px) {
-      grid-row: 2/-1;
-      grid-column: 1/-1;
-    }
-    @media screen and (max-width: 768px) {
-      grid-column: 2/-1;
-      grid-row: 1/-1;
-    }
-    @media screen and (max-width: 600px) {
-      grid-row: 2/-1;
-      grid-column: 1/-1;
-    }
-  }
-  p {
-    display: none;
-  }
-  .search-input {
-    background: var(--d-content-background);
-    border: 1px solid oklch(from var(--search-color) 80% calc(c * 2.5) h);
-    box-shadow: 0 4px 10px rgba(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 {
-    color: var(--search-color);
-  }
-  .panel-body {
-    z-index: z("dropdown");
-  }
-  .results {
-    background: var(--d-content-background);
-  }
-}

scss/sidebar-new-topic-button.scss

@@ -0,0 +1,71 @@
+.navigation-controls {
+  .topic-drafts-menu-trigger,
+  .fk-d-button-tooltip {
+    display: none;
+  }
+}
+
+.has-ai-conversations-sidebar {
+  .sidebar-new-topic-button__wrapper {
+    display: none;
+  }
+}
+
+.sidebar-new-topic-button {
+  flex: 1 1 auto;
+
+  &__wrapper {
+    box-sizing: border-box;
+    display: flex;
+
+    .mobile-view & {
+      margin: 0 0 1rem;
+    }
+
+    &:has(.topic-drafts-menu-trigger) {
+      .sidebar-new-topic-button {
+        border-radius: var(--d-button-border-radius) 0 0
+          var(--d-button-border-radius);
+        border-right: 1px solid var(--primary-300);
+      }
+    }
+
+    .fk-d-button-tooltip {
+      flex: 1 1 auto;
+    }
+
+    .topic-drafts-menu-trigger {
+      flex: 0 1 auto;
+      margin: 0;
+      border-radius: 0 var(--d-button-border-radius)
+        var(--d-button-border-radius) 0;
+    }
+
+    .fk-d-button-tooltip:has(button[disabled]) {
+      + .topic-drafts-menu-trigger {
+        display: none;
+      }
+
+      .fk-d-tooltip__trigger {
+        background: var(--accent-color);
+        border-radius: 0 var(--d-button-border-radius)
+          var(--d-button-border-radius) 0;
+        padding-right: 0.65em;
+
+        .d-icon {
+          color: var(--secondary);
+        }
+      }
+    }
+  }
+}
+
+li.sidebar-section-link-wrapper[data-list-item-name="New Topic"] {
+  display: none;
+}
+
+.has-full-page-chat {
+  .sidebar-new-topic-button__wrapper {
+    display: none;
+  }
+}

scss/sidebar.scss

@@ -1,7 +1,24 @@
-.sidebar-wrapper {
-  .has-full-page-chat & {
+@use "lib/viewport";
+
+.sidebar-wrapper,
+.sidebar-hamburger-dropdown {
+  @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;
   }
@@ -9,27 +26,48 @@
   .sidebar-sections {
     padding: 0;
   }
+
   .sidebar-section-link {
-    // font-size: var(--font-up-1); // dont want to change fonts here just yet as font-size can be changed as a user pref.
-    // font-family: "inter";
-    letter-spacing: 0.5px;
-    border-radius: 10px; //visually somewhat consistent with border on main outlet (?)
     transition: none;
+    border-radius: var(--d-border-radius);
+  }
+
+  .dropdown-menu__item .sidebar-section-link {
+    border-radius: 0;
   }
 }
+
 .sidebar-section-wrapper {
-  padding-block: 0.45em;
-  .sidebar-section-header {
-    // font-size: var(--font-down-1);
+  @include viewport.from(xl) {
+    padding-block: 0.45em;
   }
+
+  @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;
-    gap: var(--spacing-block-xs);
+
+    @include viewport.from(xl) {
+      gap: var(--spacing-block-xs);
+    }
   }
 }
 
+.sidebar-wrapper .sidebar-sections {
+  --scrollbarThumbBg: var(--d-selected);
+  padding: 0 1rem;
+}
+
 .sidebar-section-link-wrapper .sidebar-section-link:focus,
 .sidebar-section-link-wrapper .sidebar-section-link:hover {
   .d-icon {
@@ -38,14 +76,18 @@
 }
 
 .sidebar-new-topic-button__wrapper {
-  margin-bottom: 1.5rem;
-  @media screen and (max-width: 1000px) {
-    .sidebar-new-topic-button .d-icon {
-      display: none;
-    }
+  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

@@ -1,7 +1,654 @@
-.topic-list-item {
-  background: var(--d-content-background);
-  &:hover {
-    background: oklch(from var(--d-content-background) 97% c h);
-  }
-  border: 1px solid #cedde3;
+@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);
+  }
+}
+
+.topic-list-body {
+  border: none;
+  display: flex;
+  flex-direction: column;
+  gap: 1.25em;
+
+  @include viewport.until(lg) {
+    gap: 0.5em;
+    padding: 0 0.5em;
+  }
+
+  @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: min-content min-content auto min-content;
+  grid-template-areas:
+    "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);
+  cursor: pointer;
+
+  .bulk-select-enabled & {
+    grid-template-columns: min-content min-content min-content auto min-content;
+    grid-template-areas:
+      "bulk-select creator title title status"
+      "bulk-select creator category activity likes-replies";
+  }
+
+  @include viewport.until(sm) {
+    grid-template-areas:
+      "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;
+  }
+
+  &:hover {
+    .discourse-no-touch & {
+      border-color: var(--accent-color);
+      background: var(--d-content-background);
+    }
+  }
+
+  &.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;
+      }
+    }
+
+    @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";
+      }
+    }
+
+    // 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";
+    }
+  }
+
+  .link-top-line {
+    grid-area: title;
+    font-weight: 500;
+    display: flex;
+    align-items: center;
+
+    .title {
+      padding: 0;
+    }
+  }
+
+  // display contents
+  td.main-link,
+  td.posters,
+  td.posts,
+  td.views,
+  td.activity,
+  td.topic-category-status-data {
+    display: contents;
+  }
+
+  td.num.posts a {
+    padding: 0;
+  }
+
+  // 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: flex;
+    font-size: var(--font-down-1);
+    height: 100%;
+    align-items: center;
+    gap: 0.25em;
+  }
+
+  .topic-activity__type {
+    border-radius: 0.25rem;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+  }
+
+  .topic-activity__username {
+    @include ellipsis;
+    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-card {
+    height: min-content;
+    margin-left: auto;
+    display: flex;
+    flex-direction: row;
+    gap: 0.25em;
+    align-items: center;
+    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;
+
+    &.--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);
+    }
+  }
+
+  .link-top-line .event-date {
+    margin-left: 0.5em;
+    font-size: var(--font-down-3);
+  }
+
+  .topic-list-data {
+    padding: 0;
+  }
+
+  .topic-post-badges .badge-notification.unread-posts,
+  .topic-post-badges .badge-notification.new-topic {
+    background-color: var(--tertiary);
+    color: var(--tertiary);
+    overflow: hidden;
+    height: 8px;
+    width: 8px;
+    padding: 0;
+    top: -2px;
+    min-width: unset;
+  }
+
+  // metadata - excerpt
+  .topic-excerpt {
+    grid-area: excerpt;
+    margin: 0;
+    padding: 0;
+    font-size: var(--font-down-2);
+    width: 100%;
+
+    .excerpt__contents {
+      color: var(--primary-high);
+    }
+
+    // default category position hidden
+    .badge-category__wrapper {
+      display: none;
+    }
+  }
+
+  td.main-link .discourse-tags {
+    display: none;
+  }
+
+  // metadata - likes and replies
+  td.posts .badge-posts {
+    grid-area: replies;
+    align-self: center;
+    font-weight: normal;
+  }
+
+  td.topic-likes-replies-data {
+    grid-area: likes-replies;
+    display: flex;
+    flex-direction: row;
+    gap: 0.5em;
+    justify-content: flex-end;
+    height: min-content;
+    align-self: center;
+  }
+
+  .topic-likes-replies-data .topic-likes,
+  .topic-likes-replies-data .topic-replies {
+    display: flex;
+    flex-direction: row;
+    gap: 0.5em;
+    align-items: center;
+    color: var(--primary-500);
+    font-size: var(--font-down-1-rem);
+
+    svg {
+      color: var(--primary-600);
+    }
+  }
+
+  .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;
+    }
+  }
+}
+
+// Bookmarks
+.topic-list-item.bookmark-list-item {
+  .link-bottom-line {
+    font-size: unset;
+  }
+
+  // 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 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 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)
+  &.excerpt-expanded {
+    grid-template-columns: 20px min-content auto minmax(0, 100px);
+    grid-template-areas:
+      ". . .  dropdown"
+      "avatar update metadata metadata"
+      "excerpt excerpt excerpt ."
+      "excerpt excerpt excerpt category";
+
+    @include viewport.from(xl) {
+      grid-template-columns: 20px min-content auto min-content;
+    }
+
+    @include viewport.until(sm) {
+      grid-template-columns: auto min-content;
+      grid-template-areas:
+        ".  dropdown"
+        "category category";
+
+      .post-excerpt,
+      .avatar {
+        display: none;
+      }
+    }
+
+    &.has-metadata {
+      grid-template-columns: 20px min-content auto min-content;
+      grid-template-areas:
+        ". . . dropdown"
+        "avatar update metadata metadata"
+        "excerpt excerpt excerpt . "
+        "excerpt excerpt excerpt category";
+
+      @include viewport.until(sm) {
+        grid-template-columns: auto min-content;
+        grid-template-areas:
+          " . dropdown"
+          "metadata category";
+
+        .bookmark-metadata {
+          flex-wrap: wrap;
+        }
+      }
+    }
+
+    .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;
+      align-items: center;
+      width: min-content;
+      justify-self: flex-end;
+    }
+  }
+
+  td.main-link .link-top-line {
+    display: contents;
+
+    .bookmark-metadata {
+      grid-area: metadata;
+      margin: 0;
+      display: flex;
+      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;
+    }
+  }
+
+  .post-excerpt {
+    grid-area: excerpt;
+    margin: 0;
+  }
+
+  .topic-list-data:last-of-type {
+    display: contents;
+
+    .bookmark-actions-dropdown {
+      grid-area: dropdown;
+      align-self: flex-start;
+      height: 1em;
+
+      .select-kit-header {
+        padding-top: 0;
+        margin-left: auto;
+        align-items: center;
+        background: transparent;
+      }
+
+      .select-kit-header-wrapper {
+        height: 1em;
+        width: 1em;
+      }
+    }
+  }
+
+  .post-metadata.topic-list-data.updated-at {
+    grid-area: update;
+  }
+
+  td.activity .post-activity {
+    display: none;
+  }
+}
+
+// Assigned List
+.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;
+  }
+  grid-template-columns: 20px min-content min-content auto min-content min-content min-content;
+  grid-template-areas:
+    ". . . . . status dropdown"
+    "activity . . . . likes-replies category";
+
+  @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;
+      height: 1em;
+
+      .select-kit-header {
+        padding-top: 0;
+        margin-left: auto;
+        align-items: center;
+        background: transparent;
+      }
+
+      .select-kit-header-wrapper {
+        height: 1em;
+        width: 1em;
+      }
+    }
+  }
+
+  td.topic-category-status-data {
+    display: contents;
+  }
+}
+
+// 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;
+    border-bottom: 1px solid var(--primary-200);
+    border-top: none;
+    border-right: none;
+    border-left: none;
+    display: grid;
+    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-creator-data {
+      display: none;
+    }
+
+    .main-link .link-top-line {
+      grid-area: title;
+    }
+
+    &.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;
+        border-radius: 4px;
+        background-color: var(--primary-low);
+      }
+    }
+  }
+}
+
+.event-date-container {
+  display: inline-flex;
+  position: relative;
+  top: -0.25em; // optical alignment
 }

scss/topic.scss

@@ -1,68 +1,90 @@
-.post-stream {
-  .contents p {
-    // font-size: var(--font-up-1);
-    line-height: 1.25;
-  }
-}
+@use "lib/viewport";
 
-.container.posts .topic-navigation {
-  top: calc(var(--header-offset, 60px) + 6em);
+.post-stream {
+  .contents {
+    font-size: var(--font-up-1);
+    line-height: 1.25;
+    -webkit-font-smoothing: antialiased;
+  }
 }
 
 .timeline-container .topic-timeline {
-  min-width: unset; //why we have this?
+  min-width: unset; // why we have this?
+
   .timeline-scrollarea {
     border-left: 1px solid var(--accent-color);
-  }
-  .timeline-scroller {
-    padding: 0.25em;
-    border: 1px solid var(--accent-color);
-    border-radius: 0.75em;
-    padding-left: 0.5em;
-    margin-left: calc(-0.5em - 2.5px);
-    background: var(--secondary);
-    height: 40px !important; //height is coming from element style have no other choice
-  }
-  .timelime-scroller-content {
-    display: flex;
-    flex-direction: column;
-    gap: 0.25em;
-  }
-  .timeline-replies,
-  .timeline-ago {
-    line-height: 1;
-  }
-  .timeline-ago {
-    // font-size: var(--font-down-1);
-  }
-  .timeline-handle {
-    background-color: var(--accent-color);
-    width: 3px;
-    border-radius: 2px;
-    height: calc(100% - 6px);
+
+    .timeline-scroller {
+      @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
+      }
+
+      .timeline-replies,
+      .timeline-ago {
+        line-height: 1;
+      }
+    }
+
+    .timeline-handle {
+      background-color: var(--accent-color);
+
+      @include viewport.from(lg) {
+        width: 8px;
+        border-radius: 10px;
+        height: calc(100% - 6px);
+      }
+    }
   }
 }
 
-#topic-title {
-  z-index: 999;
-  margin-bottom: 1em;
-  padding: 1.5rem 2rem 0.5em;
-  position: sticky;
-  top: var(--header-offset);
-  background: var(--d-content-background);
+// should probably get rid of this extra specificity class in core?
+.timeline-container.timeline-fullscreen {
+  @include viewport.until(lg) {
+    .topic-timeline
+      .timeline-scrollarea
+      .timeline-scroller
+      .timeline-scroller-content {
+      padding-right: 0.5em;
+    }
+  }
 }
 
-.container.posts,
-.more-topics__container,
-#topic-footer-buttons {
-  padding: 0 24px;
+.container.posts {
+  grid-template-columns: auto 8em;
+
+  @media screen and (width <= 924px) {
+    grid-template-columns: auto auto;
+  }
+
+  .post-notice {
+    padding: var(--spacing-block-sm);
+    border-radius: var(--d-border-radius);
+    font-size: var(--font-down-1-rem);
+
+    .d-icon {
+      font-size: var(--font-up-1);
+      width: 1em;
+    }
+  }
+}
+
+.timeline-container .topic-timeline .timeline-ago {
+  max-width: unset;
+  overflow: unset;
+  text-overflow: unset;
+}
+
+.timeline-container .topic-timeline .timeline-scroller-content {
+  overflow: unset;
 }
 
 .more-topics__container
   .more-topics__list
   .topic-list-body
   .topic-list-item:last-of-type {
-  border-bottom: 1px solid #cedde3;
+  border-bottom: 1px solid var(--primary-300);
 }
 
 .discourse-post-event .discourse-post-event-widget {
@@ -74,3 +96,22 @@
   margin-block: unset;
   margin-bottom: 1em;
 }
+
+.timeline-container.timeline-fullscreen
+  .topic-timeline
+  .timeline-scrollarea
+  .timeline-scroller
+  .timeline-handle {
+  float: none;
+  width: 5px;
+  position: relative;
+  right: -4px;
+}
+
+nav.post-controls .actions button {
+  font-size: var(--font-0);
+}
+
+.archetype-private_message {
+  --pm-border-radius: var(--d-border-radius);
+}

scss/variables.scss

@@ -1,24 +1,10 @@
 :root {
+  --d-max-width: 1000px;
   --d-border-radius-large: 20px;
   --d-border-radius: 8px;
   --d-input-border-radius: 6px;
-  --accent-color: #3c41c3;
-  --accent-text-color: #ffffff;
-  --d-content-background: #fff;
-  --d-nav-color--active: var(--accent-color);
-  --primary: #14171f;
-  --header-background: #f5f8ff;
-  --d-post-control-background--hover: #ebecf9;
-  --d-post-control-text-color--hover: #242775;
-  --d-sidebar-link-color: var(--primary);
-  --d-sidebar-highlight-color: var(--primary);
-  --d-sidebar-link-icon-color: #8591ad;
-  --d-sidebar-section-link-icon-size: 1em;
-  --d-sidebar-highlight-background: #ebecf9;
-  --d-sidebar-active-background: #d8d9f3;
-  --d-input-bg-color: var(--d-content-background);
-  // --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

@@ -0,0 +1,117 @@
+@use "lib/viewport";
+
+.welcome-banner {
+  &__wrap {
+    display: grid;
+    grid-template-rows: 0.33fr 0.33fr 0.33fr;
+    grid-template-columns: 1fr 1fr;
+    grid-column-gap: 1em;
+    grid-row-gap: 0.5em;
+    border-bottom: 1px solid var(--primary-300);
+    padding: 1.5em 0 2.5em;
+    margin-bottom: 0;
+
+    @media screen and (width <= 768px) {
+      padding: 1em;
+    }
+
+    @include viewport.until(sm) {
+      display: block;
+      padding: 0.5em;
+      margin-top: 0;
+    }
+
+    .search-menu {
+      grid-column: 2/3;
+      grid-row: 1/-1;
+      width: 100%;
+      align-self: center;
+
+      @media screen and (width <= 1028px) {
+        grid-row: 2/-1;
+        grid-column: 1/-1;
+      }
+
+      @media screen and (width <= 768px) {
+        grid-column: 2/-1;
+        grid-row: 1/-1;
+      }
+
+      @media screen and (width <= 600px) {
+        grid-row: 2/-1;
+        grid-column: 1/-1;
+      }
+
+      @include viewport.until(sm) {
+        display: none;
+      }
+    }
+
+    p {
+      display: none;
+    }
+  }
+
+  .search-menu .search-input,
+  .search-menu-container .search-input {
+    background: var(--d-content-background);
+    border: 1px solid var(--search-color);
+    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;
+    text-align: left;
+    align-self: center;
+    margin: 0;
+    font-weight: 400;
+    color: var(--search-color);
+
+    @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 (width <= 768px) {
+      text-align: left;
+      grid-column: 1/2;
+      grid-row: 1/-1;
+      font-size: var(--font-up-3);
+    }
+
+    @media screen and (width <= 600px) {
+      grid-column: 1/-1;
+      grid-row: 1;
+      text-align: center;
+      margin-bottom: 0.5em;
+    }
+
+    @include viewport.until(sm) {
+      font-size: var(--font-up-2);
+    }
+  }
+}

settings.yml

@@ -1,2 +1,11 @@
-example_setting:
+enable_welcome_banner:
   default: true
+  description: "Overrides the core `enable welcome banner` site setting"
+
+search_experience:
+  type: enum
+  default: search_field
+  choices:
+    - search_field
+    - search_icon
+  description: "Overrides the core `search experience` site setting"

spec/system/composer_peek_spec.rb

@@ -0,0 +1,54 @@
+# frozen_string_literal: true
+
+describe "Composer peek", type: :system do
+  fab!(:current_user) { Fabricate(:user, refresh_auto_groups: true) }
+  fab!(:topic) { Fabricate(:topic_with_op) }
+
+  let(:topic_page) { PageObjects::Pages::Topic.new }
+  let(:composer) { PageObjects::Components::Composer.new }
+
+  before do
+    upload_theme
+    sign_in(current_user)
+  end
+
+  it "does not show composer peek for small windows" do
+    topic_page.visit_topic(topic)
+    topic_page.click_footer_reply
+    expect(composer).to be_opened
+
+    resize_window(width: 600) { expect(page).to have_no_css(".peek-mode-toggle") }
+  end
+
+  it "turns on composer peek and remembers this preference on page load" do
+    topic_page.visit_topic(topic)
+    topic_page.click_footer_reply
+    expect(composer).to be_opened
+
+    resize_window(width: 1380) do
+      find(".peek-mode-toggle").click
+      expect(page).to have_css("body.peek-mode-active")
+
+      topic_page.visit_topic(topic)
+      topic_page.click_footer_reply
+      expect(composer).to be_opened
+      expect(page).to have_css("body.peek-mode-active")
+
+      find(".peek-mode-toggle").click
+      expect(page).to have_no_css("body.peek-mode-active")
+    end
+  end
+
+  it "hides the composer preview when toggling" do
+    topic_page.visit_topic(topic)
+    topic_page.click_footer_reply
+    expect(composer).to be_opened
+    expect(composer).to have_composer_preview
+
+    resize_window(width: 1380) do
+      find(".peek-mode-toggle").click
+      expect(page).to have_css("body.peek-mode-active")
+      expect(composer).to have_no_composer_preview
+    end
+  end
+end

spec/system/core_features_spec.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+RSpec.describe "Core features", type: :system do
+  fab!(:current_user) { Fabricate(:user, refresh_auto_groups: true) }
+  let(:composer) { PageObjects::Components::Composer.new }
+
+  before { upload_theme_or_component }
+
+  it_behaves_like "having working core features",
+                  skip_examples: %i[search:quick_search topics:create]
+
+  it "creates a new topic" do
+    sign_in(current_user)
+    visit("/new-topic")
+    composer.fill_title("This is a new topic")
+    composer.fill_content("This is a long enough sentence.")
+    expect(page).to have_css(".d-editor-preview p", visible: true)
+    within(".save-or-cancel") { click_button("Create Topic") }
+    expect(page).to have_content("This is a new topic")
+    expect(page).to have_content("This is a long enough sentence.")
+  end
+end

spec/system/horizon_high_level_spec.rb

@@ -0,0 +1,76 @@
+# frozen_string_literal: true
+
+require_relative "./page_objects/components/user_color_palette_selector"
+
+describe "Horizon theme | High level", type: :system do
+  let!(:theme) do
+    horizon_theme = upload_theme
+    ColorScheme
+      .where(theme_id: horizon_theme.id)
+      .where.not("name LIKE '%Dark%'")
+      .update_all(user_selectable: true)
+    horizon_theme
+  end
+  fab!(:current_user) { Fabricate(:user) }
+  fab!(:tag_1) { Fabricate(:tag, name: "wow-cool") }
+  fab!(:tag_2) { Fabricate(:tag, name: "another-tag") }
+  fab!(:category)
+  fab!(:topic_1) { Fabricate(:topic_with_op, category: category, tags: [tag_1, tag_2]) }
+  let(:topic_list) { PageObjects::Components::TopicList.new }
+  let(:topic_page) { PageObjects::Pages::Topic.new }
+  let(:sidebar) { PageObjects::Components::NavigationMenu::Sidebar.new }
+  let(:palette_selector) { PageObjects::Components::UserColorPaletteSelector.new }
+
+  def run_all_high_level_tests
+    expect(page).to have_css(".experimental-screen")
+
+    expect(sidebar).to have_categories_section
+    expect(sidebar).to have_section_link(category.name)
+
+    expect(topic_list).to have_topic(topic_1)
+
+    # Ensure the topic list columns are in the correct order via 'topic-list-columns' valueTransformer
+    #
+    # NOTE(martin): Maybe there is a better way to do this in a qunit test instead.
+    topic_item = find(topic_list.topic_list_item_class(topic_1))
+    expect(topic_item.all("td").map { |el| el["class"] }).to eq(
+      [
+        "main-link topic-list-data",
+        "topic-status-data",
+        "topic-category-data",
+        "topic-likes-replies-data",
+        "topic-creator-data",
+        "topic-activity-data",
+      ],
+    )
+
+    # Can see a topic in the list and navigate to it successfully.
+    topic_list.visit_topic(topic_1)
+    expect(topic_page).to have_topic_title(topic_1.title)
+
+    # Can change site colors from the sidebar palette, which are remembered
+    # across page reloads.
+    marigold_palette = ColorScheme.find_by(name: "Marigold")
+    palette_selector.open_palette_menu
+    palette_selector.click_palette_menu_item(marigold_palette.name)
+    expect(palette_selector).to have_no_palette_menu
+
+    page.refresh
+    expect(palette_selector).to have_selected_palette(marigold_palette)
+    expect(palette_selector).to have_tertiary_color(marigold_palette)
+  end
+
+  it "works for anon" do
+    visit "/"
+    run_all_high_level_tests
+  end
+
+  context "for signed in users" do
+    before { sign_in(current_user) }
+
+    it "works" do
+      visit "/"
+      run_all_high_level_tests
+    end
+  end
+end

spec/system/page_objects/components/user_color_palette_selector.rb

@@ -0,0 +1,53 @@
+# frozen_string_literal: true
+
+module PageObjects
+  module Components
+    class UserColorPaletteSelector < PageObjects::Components::Base
+      def sidebar_footer_button_css
+        ".sidebar-footer-actions .user-color-palette-selector"
+      end
+
+      def palette_menu
+        PageObjects::Components::DMenu.new(find(sidebar_footer_button_css))
+      end
+
+      def open_palette_menu
+        palette_menu.expand
+      end
+
+      def has_no_palette_menu?
+        has_no_css?(".user-color-palette-selector-content")
+      end
+
+      def click_palette_menu_item(palette_name)
+        find(
+          ".user-color-palette-menu__content .user-color-palette-menu__item[data-color-palette='#{palette_name}']",
+        ).click
+      end
+
+      def has_selected_palette?(palette)
+        has_css?(".user-color-palette-selector[data-selected-color-palette-id='#{palette.id}']")
+      end
+
+      def has_loaded_css?
+        has_css?(".user-color-palette-selector.user-color-palette-css-loaded")
+      end
+
+      def has_tertiary_color?(palette)
+        computed_color_hex =
+          page.evaluate_script(
+            "getComputedStyle(document.documentElement).getPropertyValue('--tertiary')",
+          )
+        computed_color_hex == "#" + palette.colors.find { |color| color.name == "tertiary" }.hex
+      end
+
+      def has_computed_color?(color)
+        computed_background_color =
+          page.evaluate_script(
+            "getComputedStyle(document.querySelector(\"li.sidebar-section-link-wrapper[data-list-item-name='everything'] .active\")).backgroundColor",
+          )
+        computed_background_color == color
+      end
+    end
+  end
+end

spec/system/sidebar_topic_button_spec.rb

@@ -0,0 +1,55 @@
+# frozen_string_literal: true
+
+RSpec.describe "Sidebar New Topic Button", system: true do
+  before { upload_theme }
+  fab!(:group)
+  fab!(:user) { Fabricate(:user, trust_level: 3, groups: [group]) }
+  fab!(:category)
+  fab!(:private_category) do
+    c = Fabricate(:category_with_definition)
+    c.set_permissions(group => :readonly)
+    c.save
+    c
+  end
+
+  context "for signed in users" do
+    before { sign_in(user) }
+
+    it "renders the new topic button in the sidebar" do
+      visit("/latest")
+      expect(page).to have_css(".sidebar-new-topic-button__wrapper")
+      expect(page).to have_css(".sidebar-new-topic-button:not(.disabled)")
+    end
+
+    it "opens the composer when clicked" do
+      visit("/")
+      find(".sidebar-new-topic-button").click
+      expect(page).to have_css("#reply-title")
+    end
+
+    it "shows draft menu when drafts exist" do
+      Draft.create!(user: user, draft_key: "topic_1", data: {})
+
+      visit("/")
+      expect(page).to have_css(".sidebar-new-topic-button__wrapper .topic-drafts-menu-trigger")
+    end
+
+    it "disables button when visiting read-only category" do
+      visit("/c/#{private_category.slug}/#{private_category.id}")
+
+      expect(page).to have_css(".sidebar-new-topic-button[disabled]")
+
+      visit("/c/#{category.slug}/#{category.id}")
+
+      expect(page).not_to have_css(".sidebar-new-topic-button[disabled]")
+    end
+  end
+
+  context "for anon" do
+    it "does not render the sidebar button for anons" do
+      visit("/latest")
+      expect(page).not_to have_css(".sidebar-new-topic-button__wrapper")
+      expect(page).not_to have_css(".sidebar-new-topic-button:not(.disabled)")
+    end
+  end
+end

spec/system/user_color_palette_selector_spec.rb

@@ -0,0 +1,119 @@
+# frozen_string_literal: true
+
+require_relative "./page_objects/components/user_color_palette_selector"
+
+describe "Horizon theme | User color palette selector", type: :system do
+  let(:set_theme_as_default) { true }
+  let!(:theme) do
+    horizon_theme = upload_theme(set_theme_as_default: set_theme_as_default)
+    ColorScheme.where(theme_id: horizon_theme.id).update_all(user_selectable: true)
+    horizon_theme
+  end
+  fab!(:current_user) { Fabricate(:user) }
+  let(:sidebar) { PageObjects::Components::NavigationMenu::Sidebar.new }
+  let(:palette_selector) { PageObjects::Components::UserColorPaletteSelector.new }
+  let(:interface_color_mode) { PageObjects::Components::InterfaceColorMode.new }
+  let(:interface_color_selector) do
+    PageObjects::Components::InterfaceColorSelector.new(".sidebar-footer-actions")
+  end
+  let(:marigold_palette) { ColorScheme.find_by(name: "Marigold") }
+  let(:marigold_palette_dark) { ColorScheme.find_by(name: "Marigold Dark") }
+
+  before { SiteSetting.interface_color_selector = "sidebar_footer" }
+
+  it "does not show the sidebar button if there are no user-selectable color palettes" do
+    ColorScheme.update_all(user_selectable: false)
+    visit "/"
+    expect(page).to have_no_css(palette_selector.sidebar_footer_button_css)
+  end
+
+  describe "for logged in user" do
+    before { sign_in(current_user) }
+
+    it "can open the user color palette menu and select a palette, which is preseved on reload" do
+      visit "/"
+      palette_selector.open_palette_menu
+      palette_selector.click_palette_menu_item(marigold_palette.name)
+
+      expect(palette_selector).to have_no_palette_menu
+      expect(palette_selector).to have_selected_palette(marigold_palette)
+      expect(palette_selector).to have_loaded_css
+      expect(palette_selector).to have_tertiary_color(marigold_palette)
+
+      page.refresh
+      expect(palette_selector).to have_selected_palette(marigold_palette)
+    end
+
+    it "uses the dark version of the palette if the user selects dark mode" do
+      visit "/"
+      palette_selector.open_palette_menu
+      palette_selector.click_palette_menu_item(marigold_palette.name)
+
+      expect(palette_selector).to have_no_palette_menu
+      expect(palette_selector).to have_selected_palette(marigold_palette)
+      expect(palette_selector).to have_loaded_css
+      expect(palette_selector).to have_computed_color("oklch(0.92 0.0708528 68.5036)")
+
+      interface_color_selector.expand
+      interface_color_selector.dark_option.click
+      expect(interface_color_mode).to have_dark_mode_forced
+      expect(palette_selector).to have_computed_color("oklch(0.481966 0.0354264 68.5036)")
+
+      page.refresh
+      expect(palette_selector).to have_selected_palette(marigold_palette)
+      expect(palette_selector).to have_computed_color("oklch(0.481966 0.0354264 68.5036)")
+    end
+
+    context "when the theme is not default but is selected by a user" do
+      let(:set_theme_as_default) { false }
+
+      it "can open the user color palette menu and select a palette, which is preseved on reload" do
+        theme.update!(user_selectable: true)
+        current_user.user_option.update!(theme_ids: [theme.id])
+        visit "/"
+        palette_selector.open_palette_menu
+        palette_selector.click_palette_menu_item(marigold_palette.name)
+
+        expect(palette_selector).to have_no_palette_menu
+        expect(palette_selector).to have_selected_palette(marigold_palette)
+        expect(palette_selector).to have_loaded_css
+        expect(palette_selector).to have_tertiary_color(marigold_palette)
+      end
+    end
+  end
+
+  describe "for anon" do
+    it "can open the user color palette menu and select a palette, which is preseved on reload" do
+      visit "/"
+      palette_selector.open_palette_menu
+      palette_selector.click_palette_menu_item(marigold_palette.name)
+
+      expect(palette_selector).to have_no_palette_menu
+      expect(palette_selector).to have_selected_palette(marigold_palette)
+      expect(palette_selector).to have_loaded_css
+      expect(palette_selector).to have_tertiary_color(marigold_palette)
+    end
+
+    it "uses the dark version of the palette if the user selects dark mode, which is preserved on reload" do
+      visit "/"
+      palette_selector.open_palette_menu
+      palette_selector.click_palette_menu_item(marigold_palette.name)
+
+      expect(palette_selector).to have_no_palette_menu
+      expect(palette_selector).to have_selected_palette(marigold_palette)
+      expect(palette_selector).to have_loaded_css
+      expect(palette_selector).to have_computed_color("oklch(0.92 0.0708528 68.5036)")
+
+      interface_color_selector.expand
+      interface_color_selector.dark_option.click
+      expect(interface_color_mode).to have_dark_mode_forced
+      expect(palette_selector).to have_selected_palette(marigold_palette)
+      expect(palette_selector).to have_loaded_css
+      expect(palette_selector).to have_computed_color("oklch(0.481966 0.0354264 68.5036)")
+
+      page.refresh
+      expect(palette_selector).to have_selected_palette(marigold_palette)
+      expect(palette_selector).to have_computed_color("oklch(0.481966 0.0354264 68.5036)")
+    end
+  end
+end

stylelint.config.mjs

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