From 864cbc35696fb5b7bd96a5e1cc857c1672aa3576 Mon Sep 17 00:00:00 2001
From: CN-JS-HuiBai <huyang@littlediary.cn>
Date: Mon, 6 Apr 2026 19:44:57 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BC=98=E5=8C=96=E7=BA=BF=E6=9D=A12?=
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---
 public/js/app.js | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/public/js/app.js b/public/js/app.js
index ea11d31..9010595 100644
--- a/public/js/app.js
+++ b/public/js/app.js
@@ -985,10 +985,10 @@
           let finalCurve = 0;
           if (isSeattleJapan) {
             // Special rule: Seattle ↔ Japan route curves upward (North)
-            // For Seattle -> Japan (Westbound): Right is North (+).
-            // For Japan -> Seattle (Eastbound): Right is South (+), so North is (-).
+            // Based on user feedback that previous signs resulted in a downward curve,
+            // we flip them to ensure the intended upward arc.
             const isWestbound = (lowS === 'seattle' || lowS === 'us seattle');
-            finalCurve = isWestbound ? 0.3 : -0.3;
+            finalCurve = isWestbound ? -0.3 : 0.3;
           } else if (count === 1) {
             // Subtle consistent curve for single routes to maintain parallelism
             finalCurve = 0.12;