constitution · epochs · watch · epoch 3

comparison

c_597d3f736194 (tommy-mor) vs c_b00c261f06c2 (tommy-mor)

download prompt · raw event · cmp_fd49d5ff23adc7

council reasoning

~anthropic/claude-sonnet-latest · winner B · 6:4 · permalink

B fixes a real product bug (per-group rank indexing was leaking a global offset into gradient styling, and vote history slider/ratio polarity) and adds targeted unit tests (rank_row_style_gradients, winner_side, slider mapping, ranking polarity) that lock in the corrected behavior. A only patches test-support mock server code (regex vs string split, response header codes, request body access) which is useful for keeping E2E tests green but has no effect on the shipped product.

~x-ai/grok-latest · winner B · 2:3 · permalink

B fixes user-facing vote/rank correctness (per-group gradient ranks instead of a global ordinal, center-anchored winner highlighting, history sliders aligned with HUD polarity) and locks it in with targeted Rust tests. A is a real, necessary repair of broken OAuth E2E mocks (regex split, getRequestBody, null-safe state/token, handler try/catch) plus selector tweaks, but it only restores test infrastructure rather than lasting product behavior.

openai/gpt-chat-latest · winner A · 3:1 · permalink

Side A restores broken end-to-end OAuth authentication tests by fixing concrete server mock failures: it corrects form/body reading (`getRequestBody`), query parsing, redirect handling, null safety, and wraps handlers to avoid crashes, while also improving test interactions with selectors. Side B mainly improves vote comparison highlighting and history presentation with associated logic and tests, but these are UI behavior refinements rather than fixing a foundational test infrastructure regression.

sides

A — c_597d3f736194 (tommy-mor)

message

[075d4d37] Fix OAuth test mocks so Clojure E2E auth flows work again.

HttpServer handlers were crashing on query parsing and token POSTs, which broke Playwright login; also read alias/history via real CSS selectors.

Co-authored-by: Cursor <cursoragent@cursor.com>

diff preview

diff --git a/test/auth_login.clj b/test/auth_login.clj
index 6f2f00d7aa7340e63d1ac465b0a2234cec7a983f..aa63b66ccb2471b710ba3d168d0461252b39fc10 100644
--- a/test/auth_login.clj
+++ b/test/auth_login.clj
@@ -14,27 +14,27 @@
 (defn- type-alias! [pg text]
   (page/evaluate pg
                  (.replace
-                  "(() => { const i = document.getElementById('alias-input'); const f = document.getElementById('alias-check-form'); if (!i || !f) return;
+                  "(() => { const i = document.getElementById('alias-input'); const f = document.getElementById('alias-check-form'); if (!i || !f) return Promise.resolve('missing-form');
                     i.value = __TEXT__;
                     const cf = document.getElementById('alias-claim-field'); if (cf) cf.value = i.value;
                     return fetch(f.action, { method: 'POST', credentials: 'same-origin',
                       headers: { 'Content-Type': 'application/x-www-form-urlencoded' },
                       body: new URLSearchParams(new FormData(f)).toString() })
                       .then(function (r) { return r.text(); })
-                      .then(function (t) { eval(t); }); })()"
+                      .then(function (t) { eval(t); return document.getElementById('alias-status')?.textContent || ''; }); })()"
                   "__TEXT__"
-                  (pr-str text)))
-  (Thread/sleep 400))
+                  (pr-str text))))
 
-(defn- element-text [pg test-id]
+(defn- element-text [pg selector]
   (let [raw (page/evaluate pg
-                           (str "document.querySelector('[data-testid=\"" test-id "\"]')?.textContent || ''"))]
+                           (str "document.querySelector(" (pr-str selector) ")?.textContent || ''"))]
     (when (string? raw) (str/trim raw))))
 
 (defn- wait-for-text [pg test-id text timeout-ms]
-  (let [deadline (+ (System/currentTimeMillis) timeout-ms)]
+  (let [deadline (+ (System/currentTimeMillis) timeout-ms)
+        selector (str "[data-testid=\"" test-id "\"]")]
     (loop []
-      (let [got (or (element-text pg test-id) "")]
+      (let [got (or (element-text pg selector) "")]
         (cond
           (= got text) got
           (< (System/currentTimeMillis) deadline) (do (Thread/sleep 200) (recur))
diff --git a/test/support/mock_oauth.clj b/test/support/mock_oauth.clj
index 5ba7e9be3cf6d2226648e9609a09ed45f306930f..333fe08d56cb06bac2a338cad1c73894d54c4495 100644
--- a/test/support/mock_oauth.clj
+++ b/test/support/mock_oauth.clj
@@ -7,7 +7,7 @@
 (defn- query-param [query key]
   (when query
     (some (fn [pair]
-            (let [[k v] (str/split pair "=" 2)]
+            (let [[k v] (str/split pair #"=" 2)]
               (when (= k key)
                 (URLDecoder/decode (or v "") "UTF-8"))))
           (str/split query #"&"))))
@@ -31,11 +31,11 @@
 
 (defn- send-redirect [^HttpExchange ex location]
   (.set (.getResponseHeaders ex) "Location" location)
-  (.sendResponseHeaders ex 302 -1)
+  (.sendResponseHeaders ex 302 0)
   (.close (.getResponseBody ex)))
 
 (defn- read-form [^HttpExchange ex]
-  (let [body (slurp (.getInputStream ex))]
+  (let [body (slurp (.getRequestBody ex))]
     {:code (query-param body "code")
      :grant (query-param body "grant_type")}))
 
@@ -45,7 +45,7 @@
           (str/replace #"^[Bb]earer " "")))
 
 (defn- parse-token-user [token]
-  (when (str/starts-with? token "mock:")
+  (when (and token (str/starts-with? token "mock:"))
     (parse-mock-user (subs token 5))))
 
 (defn- authorize-redirect [exchange query]
@@ -55,7 +55,7 @@
         user (parse-mock-user mock-user)
         code (str "mock:" (:id user) ":" (:login user))
         loc (str redirect-uri "?code=" (java.net.URLEncoder/encode code "UTF-8")
-                 "&state=" (java.net.URLEncoder/encode state "UTF-8"))]
+                 "&state=" (java.net.URLEncoder/encode (or state "") "UTF-8"))]
     (send-redirect exchange loc)))
 
 (defn start-mock-oauth
@@ -65,49 +65,56 @@
         handler
         (proxy [HttpHandler] []
           (handle [^HttpExchange exchange]
-            (let [uri (.getRequestURI exchange)
-                  path (.getPath uri)
-                  query (.getQuery uri)
-                  method (.getRequestMethod exchange)]
-              (cond
-                ;; GitHub authorize
-                (str/ends-with? path "/login/oauth/authorize")
-                (authorize-redirect exchange query)
+            (try
+              (let [uri (.getRequestURI exchange)
+                    path (.getPath uri)
+                    query (.getQuery uri)
+                    method (.getRequestMethod exchange)]
+                (cond
+                  ;; GitHub authorize
+                  (str/ends-with? path "/login/oauth/authorize")
+                  (authorize-redirect exchange query)
 
-                ;; Reddit authorize
-                (str/ends-with? path "/api/v1/authorize")
-                (authorize-redirect exchange query)
+                  ;; Reddit authorize
+                  (str/ends-with? path "/api/v1/authorize")
+                  (authorize-redirect exchange query)
 
-                ;; GitHub token
-                (and (= method "POST") (str/ends-with? path "/login/oauth/access_token"))
-                (let [code (or (:code (read-form exchange)) "mock:1002:newbie")]
-                  (send-json exchange 200 (str "{\"access_token\":\"" code "\",\"token_type\":\"bearer\"}")))
+                  ;; GitHub token
+                  (and (= method "POST") (str/ends-with? path "/login/oauth/access_token"))
+                  (let [code (or (:code (read-form exchange)) "mock:1002:newbie")]
+                    (send-json exchange 200 (str "{\"access_token\":\"" code "\",\"token_type\":\"bearer\"}")))
 
-                ;; Reddit token (client_credentials for import + authorization_code for login)
-                (and (= method "POST") (str/ends-with? path "/api/v1/access_token"))
-                (let [form (read-form exchange)
-                      grant (or (:grant form) "")
-                      code (or (:code form) "mock:t2_test:redditor")]
-                  (if (= grant "client_credentials")
-                    (send-json exchange 200 "{\"access_token\":\"app-token\",\"token_type\":\"bearer\",\"expires_in\":3600}")
-                    (send-json exchange 200 (str "{\"access_token\":\"" code "\",\"token_type\":\"bearer\",\"expires_in\":3600}"))))
+                  ;; Reddit token (client_credentials for import + authorization_code for login)
+                  (and (= method "POST") (str/ends-with? path "/api/v1/access_token"))
+                  (let [form (read-form exchange)
+                        grant (or (:grant form) "")
+                        code (or (:code form) "mock:t2_test:redditor")]
+                    (if (= grant "client_credentials")
+                      (send-json exchange 200 "{\"access_token\":\"app-token\",\"token_type\":\"bearer\",\"expires_in\":3600}")
+                      (send-json exchange 200 (str "{\"access_token\":\"" code "\",\"token_type\":\"bearer\",\"expires_in\":3600}"))))
 
-                ;; GitHub user
-                (= path "/user")
-                (let [token (bearer-token exchange)
-                      user (or (parse-token-user token) {:id "1002" :login "newbie" :numeric? true})]
-                  (send-json exchange 200
-                             (str "{\"id\":" (:id user) ",\"login\":\"" (:login user) "\"}")))
+                  ;; GitHub user
+                  (= path "/user")
+                  (let [token (bearer-token exchange)
+                        user (or (parse-token-user token) {:id "1002" :login "newbie" :numeric? true})]
+                    (send-json exchange 200
+                               (str "{\"id\":" (:id user) ",\"login\":\"" (:login user) "\"}")))
 
-                ;; Reddit /api/v1/me
-                (str/ends-with? path "/api/v1/me")
-                (let [token (bearer-token exchange)
-                      user (or (parse-token-user token) {:id "t2_test" :login "redditor"})]
-                  (send-json exchange 200
-                             (str "{\"id\":\"" (:id user) "\",\"name\":\"" (:login user) "\"}")))
+                  ;; Reddit /api/v1/me
+                  (str/ends-with? path "/api/v1/me")
+                  (let [token (bearer-token exchange)
+                        user (or (parse-token-user token) {:id "t2_test" :login "redditor"})]
+                    (send-json exchange 200
+                               (str "{\"id\":\"" (:id user) "\",\"name\":\"" (:login user) "\"}")))
 
-                :else
-                (send-json exchange 404 "{\"error\":\"not found\"}")))))]
+                  :else
+                  (send-json exchange 404 "{\"error\":\"not found\"}")))
+              (catch Throwable t
+                (binding [*out* *err*]
+                  (println "mock-oauth handler error:" t))
+                (try
+                  (send-json exchange 500 "{\"error\":\"mock-oauth internal\"}")
+                  (catch Throwable _))))))]
     (.createContext server "/" handler)
     (.setExecutor server nil)
     (.start server)
diff --git a/test/support/mock_reddit.clj b/test/support/mock_reddit.clj
index a630cf0938722193e9af88382d60e777ff371be4..faa27945b6394363914c853627a0bad1e819a5f9 100644
--- a/test/support/mock_reddit.clj
+++ b/test/support/mock_reddit.clj
@@ -12,7 +12,7 @@
 (defn- query-param [query key]
   (when query
     (some (fn [pair]
-            (let [[k v] (str/split pair "=" 2)]
+            (let [[k v] (str/split pair #"=" 2)]
               (when (= k key)
                 (URLDecoder/decode (or v "") "UTF-8"))))
           (str/split query #"&"))))
@@ -34,11 +34,11 @@
 
 (defn- send-redirect [^HttpExchange ex location]
   (.set (.getResponseHeaders ex) "Location" location)
-  (.sendResponseHeaders ex 302 -1)
+  (.sendResponseHeaders ex 302 0)
   (.close (.getResponseBody ex)))
 
 (defn- read-form [^HttpExchange ex]
-  (let [body (slurp (.getInputStream ex))]
+  (let [body (slurp (.getRequestBody ex))]
     {:code (query-param body "code")
      :grant (query-param body "grant_type")}))
 
@@ -48,7 +48,7 @@
           (str/replace #"^[Bb]earer " "")))
 
 (defn- parse-token-user [token]
-  (when (str/starts-with? token "mock:")
+  (when (and token (str/starts-with? token "mock:"))
     (parse-mock-user (subs token 5))))
 
 (defn start-mock-reddit
@@ -72,7 +72,7 @@
                        user (parse-mock-user (query-param query "mock_user"))
                        code (str "mock:" (:id user) ":" (:login user))
                        loc (str redirect-uri "?code=" (java.net.URLEncoder/encode code "UTF-8")
-                                "&state=" (java.net.URLEncoder/encode state "UTF-8"))]
+                                "&state=" (java.net.URLEncoder/encode (or state "") "UTF-8"))]
                    (send-redirect exchange loc))
 
                  (and (= method "POST") (str/ends-with? path "/api/v1/access_token"))

download full diff A

B — c_b00c261f06c2 (tommy-mor)

message

[04b81f91] Fix vote compare highlighting

Co-authored-by: Cursor <cursoragent@cursor.com>

diff preview

diff --git a/server/src/html/mod.rs b/server/src/html/mod.rs
index 588cf62bcea608ed4ede363810f022a67b43b960..e180a0ca542a33e2300c0a4809e6b9cfee07ecfe 100644
--- a/server/src/html/mod.rs
+++ b/server/src/html/mod.rs
@@ -291,18 +291,17 @@ fn rank_list(
     label: &str,
     items: &[RankedItem],
     start_rank: usize,
-    total_ranked: usize,
-    ordinal_offset: usize,
     highlighted: &HashSet<ItemId>,
     tree: &GlobalTree,
 ) -> Markup {
+    let group_len = items.len();
     html! {
         @if !items.is_empty() {
             h3 class="rank-heading muted small" { (label) }
             ol class="rank-list" {
                 @for (i, r) in items.iter().enumerate() {
                     @let href = item_href(&r.item);
-                    @let style = rank_row_style(parent, ordinal_offset + i, total_ranked);
+                    @let style = rank_row_style(parent, i, group_len);
                     @let class = rank_row_class(&r.item, highlighted);
                     li class=(class)
                         data-rank-item=(r.item.as_str())
@@ -420,8 +419,6 @@ pub fn ranking_panel_with_highlights(
 
     let has_ranked = !ranked_groups.is_empty();
     let multi = ranked_groups.len() > 1;
-    let total_ranked: usize = ranked_groups.iter().map(|g| g.len()).sum();
-    let mut ordinal_offset = 0usize;
 
     html! {
         section id="ranking-panel" class="demo-panel" {
@@ -436,8 +433,7 @@ pub fn ranking_panel_with_highlights(
             } @else {
                 @for (gi, ranked) in ranked_groups.iter().enumerate() {
                     @let label = if multi { format!("Ranking group {}", gi + 1) } else { "Ranking".to_string() };
-                    (rank_list(item, &label, ranked, 1, total_ranked, ordinal_offset, highlighted, tree))
-                    @let _ = { ordinal_offset += ranked.len(); };
+                    (rank_list(item, &label, ranked, 1, highlighted, tree))
                 }
                 (unranked_list("Unranked", &unranked, highlighted, tree))
             }
@@ -520,7 +516,20 @@ pub async fn browse(State(state): State<AppState>, uri: Uri) -> impl IntoRespons
 
 #[cfg(test)]
 mod tests {
-    use super::SORTER_UI_JS;
+    use super::{rank_row_style, SORTER_UI_JS};
+    use crate::path_types::ItemId;
+
+    #[test]
+    fn rank_row_style_gradients_per_group_not_globally() {
+        let parent = ItemId::opaque("test-scope");
+        let first_in_four = rank_row_style(&parent, 0, 4);
+        let last_in_four = rank_row_style(&parent, 3, 4);
+        let first_in_two = rank_row_style(&parent, 0, 2);
+        let last_in_two = rank_row_style(&parent, 1, 2);
+        assert_eq!(first_in_four, first_in_two);
+        assert_eq!(last_in_four, last_in_two);
+        assert_ne!(first_in_four, last_in_four);
+    }
 
     #[test]
     fn vote_slider_left_position_favors_left_item() {
diff --git a/server/src/html/vote.rs b/server/src/html/vote.rs
index 483c7ff8cd35266744957cf0087f2b5f76f1a237..30dab303b9d1e763a5b9261dffff13a778e3e4e3 100644
--- a/server/src/html/vote.rs
+++ b/server/src/html/vote.rs
@@ -19,7 +19,7 @@ use crate::{
     ui_action::UI_RPC_FIELD,
 };
 
-use super::{breadcrumb_path, item_href, layout};
+use super::{breadcrumb_path, layout};
 
 #[derive(Debug, Deserialize)]
 pub struct VoteQuery {
@@ -59,17 +59,6 @@ fn child_title(tree: &GlobalTree, id: &ItemId) -> String {
         .unwrap_or_else(|| display_label(id))
 }
 
-fn ratio_pct(ratio_left: i32, ratio_right: i32) -> f64 {
-    let l = ratio_left.max(0) as f64;
-    let r = ratio_right.max(0) as f64;
-    let sum = l + r;
-    if sum <= 0.0 {
-        50.0
-    } else {
-        (l / sum) * 100.0
-    }
-}
-
 fn ratios_for_page(v: &VoteData, page_left: &ItemId, page_right: &ItemId) -> (i32, i32) {
     match (v.a.as_str(), v.b.as_str()) {
         (a, b) if a == page_left.as_str() && b == page_right.as_str() => {
@@ -94,6 +83,37 @@ fn edge_votes(group: &GroupState, left: &ItemId, right: &ItemId) -> Vec<VoteData
         .collect()
 }
 
+/// HUD `data-winner` value: which side the ratio favours on this page.
+fn winner_side(r_left: i32, r_right: i32) -> &'static str {
+    if r_left > r_right {
+        "left"
+    } else if r_right > r_left {
+        "right"
+    } else {
+        "even"
+    }
+}
+
+fn winner_text(r_left: i32, r_right: i32) -> &'static str {
+    match winner_side(r_left, r_right) {
+        "left" => "left wins",
+        "right" => "right wins",
+        _ => "tie",
+    }
+}
+
+/// Map stored ratios to the live slider position (0 = full left, 100 = full right).
+/// Matches `sorter_ui.js`: `left = 100 - v`, `right = v`.
+fn slider_value_from_ratios(r_left: i32, r_right: i32) -> i32 {
+    let l = r_left.max(0) as f64;
+    let r = r_right.max(0) as f64;
+    let sum = l + r;
+    if sum <= 0.0 {
+        return 50;
+    }
+    ((r / sum) * 100.0).round().clamp(0.0, 100.0) as i32
+}
+
 fn vote_edge_history(tree: &GlobalTree, group: &GroupState, left: &ItemId, right: &ItemId) -> Markup {
     let mut votes = edge_votes(group, left, right);
     votes.sort_by(|a, b| b.ts.cmp(&a.ts));
@@ -106,17 +126,26 @@ fn vote_edge_history(tree: &GlobalTree, group: &GroupState, left: &ItemId, right
             h3 class="vote-edge-history-title" {
                 "votes on this pair"
             }
+            p class="muted small vote-edge-legend" {
+                (format!("left: {legend_left} — right: {legend_right}"))
+            }
             ul class="vote-edge-history" {
                 @for v in &votes {
                     @let (r_left, r_right) = ratios_for_page(v, left, right);
-                    @let pct = ratio_pct(r_left, r_right);
+                    @let slider_val = slider_value_from_ratios(r_left, r_right);
+                    @let side = winner_side(r_left, r_right);
+                    @let label = winner_text(r_left, r_right);
                     li class="vote-edge-history-row" {
                         div class="vote-edge-meta" {
                             span class="vote-edge-ratio" { (format!("{}:{}", r_left, r_right)) }
+                            span class="vote-edge-winner muted small" { " · " (label) }
                         }
-                        div class="ratio-bar vote-edge-bar" aria-hidden="true" {
-                            div class="ratio-left" style={(format!("width: {:.3}%;", pct))} {}
-                            div class="ratio-right" style={(format!("width: {:.3}%;", 100.0 - pct))} {}
+                        label class="vote-hud-slider vote-edge-slider" aria-hidden="true" {
+                            input type="range" class="vote-edge-range" min="0" max="100" value=(slider_val)
+                                data-winner=(side)
+                                style={(format!("--vote-slider-pct: {}%;", slider_val))}
+                                disabled
+                                tabindex="-1";
                         }
                     }
                 }
@@ -283,7 +312,6 @@ pub async fn vote_page(
                         span class="vote-compare-vs" { "vs" }
                         (vote_compare_item_card(&tree, &right, "vote-compare-right"))
                     }
-                    (vote_back_nav(&parent))
                     div id="vote-edge-history-region" {
                         (edge_history)
                     }
@@ -308,3 +336,66 @@ pub async fn vote_page(
     )
     .into_response()
 }
+
+#[cfg(test)]
+mod polarity_tests {
+    use super::*;
+    use crate::ranking::ranked_items;
+    use crate::reducer::GlobalTree;
+
+    fn id(s: &str) -> ItemId {
+        ItemId::parse(s).unwrap()
+    }
+
+    /// The page's left number must always equal the vote's weight for the
+    /// item shown on the left, regardless of which order the vote stored a/b.
+    #[test]
+    fn ratios_for_page_orients_to_page_left() {
+        let left = id("left_item");
+        let right = id("right_item");
+
+        // Stored a == page left: keep order.
+        let v1 = VoteData::from_recorded(1, left.as_str(), right.as_str(), 9, 1).unwrap();
+        assert_eq!(ratios_for_page(&v1, &left, &right), (9, 1));
+
+        // Stored a == page right: swap so left stays left.
+        let v2 = VoteData::from_recorded(2, right.as_str(), left.as_str(), 9, 1).unwrap();
+        assert_eq!(ratios_for_page(&v2, &left, &right), (1, 9));
+    }
+
+    #[test]
+    fn winner_side_follows_larger_ratio() {
+        assert_eq!(winner_side(9, 1), "left");
+        assert_eq!(winner_side(1, 9), "right");
+        assert_eq!(winner_side(1, 1), "even");
+    }
+
+    #[test]
+    fn slider_value_matches_hud_mapping() {
+        assert_eq!(slider_value_from_ratios(9, 1), 10);
+        assert_eq!(slider_value_from_ratios(1, 4), 80);
+        assert_eq!(slider_value_from_ratios(1, 1), 50);
+    }
+
+    /// End-to-end polarity invariant: a vote that favours the LEFT item (higher
+    /// `ratio_left`, recorded as the RPC's `a`) must make that item rank #1.
+    /// This is the property the UI must preserve: sliding left => left wins.
+    #[test]
+    fn sliding_left_makes_left_item_win_ranking() {
+        let parent = id("scope");
+        let left = id("left_item");
+        let right = id("right_item");
+
+        // Slider dragged left yields e.g. 9:1 with a = left item.
+        let vote = VoteData::from_recorded(1, left.as_str(), right.as_str(), 9, 1).unwrap();
+        let mut tree = GlobalTree::new();
+        tree.apply_vote(&parent, vote);
+
+        let group = &tree.get(&parent).unwrap().local_ranking;
+        let ranked = ranked_items(group);
+        assert_eq!(
+            ranked[0].item, left,
+            "left item should rank first when ratio favours the left"
+        );
+    }
+}
diff --git a/server/static/sorter.css b/server/static/sorter.css
index 5da967e8bfddc2bc34662fced841860f63f1ef36..bdd3d931365703705be08537a07f3ccaf975d3ea 100644
--- a/server/static/sorter.css
+++ b/server/static/sorter.css
@@ -124,7 +124,7 @@ code {
   z-index: 1;
   box-shadow:
     inset 0 0 0 3px var(--accent),
-    inset 0 0 0 5px color-mix(in oklch, var(--rank-fg) 70%, transparent);
+    inset 0 0 0 5px color-mix(in oklch, var(--rank-fg, var(--fg)) 70%, transparent);
   filter: saturate(1.15) brightness(1.04);
 }
 
@@ -320,7 +320,7 @@ h1 {
   grid-template-columns: var(--vote-ratio-col) minmax(0, 1fr) var(--vote-actions-col);
   gap: 0.5rem 0.65rem;
   align-items: center;
-  --vote-ratio-col: 3.25rem;
+  --vote-ratio-col: 12.5rem;
   --vote-actions-col: 11.5rem;
 }
 
@@ -332,7 +332,7 @@ h1 {
   margin: 0;
   width: var(--vote-ratio-col);
   min-width: var(--vote-ratio-col);
-  text-align: center;
+  text-align: right;
   white-space: nowrap;
 }
 
@@ -474,6 +474,16 @@ h1 {
   --vote-track-muted: color-mix(in oklch, var(--muted) 55%, var(--bg));
 }
 
+/* Center-anchored fill: the accent grows from the midpoint toward the thumb,
+   so the highlighted mass always sits on the *winning* side (the side the
+   thumb was dragged toward). Left winning => accent on the left half. */
+.vote-hud-slider input[type="range"][data-winner="even"]::-webkit-slider-runnable-track {
+  height: 0.65rem;
+  border-radius: 0;
+  border: 2px solid var(--border);
+  background: var(--vote-track-muted);
+}
+
 .vote-hud-slider input[type="range"][data-winner="left"]::-webkit-slider-runnable-track {
   height: 0.65rem;
   border-radius: 0;
@@ -483,7 +493,9 @@ h1 {
     var(--vote-track-muted) 0%,
     var(--vote-track-muted) var(--vote-slider-pct, 50%),
     var(--accent) var(--vote-slider-pct, 50%),
-    var(--accent) 100%
+    var(--accent) 50%,
+    var(--vote-track-muted) 50%,
+    var(--vote-track-muted) 100%
   );
 }
 
@@ -493,7 +505,9 @@ h1 {
   border: 2px solid var(--border);
   background: linear-gradient(
     to right,
-    var(--accent) 0%,
+    var(--vote-track-muted) 0%,
+    var(--vote-track-muted) 50%,
+    var(--accent) 50%,
     var(--accent) var(--vote-slider-pct, 50%),
     var(--vote-track-muted) va

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