update

shader/panel.frag

@@ -0,0 +1,29 @@
+#version 330 core
+
+in vec3 vWorldPos;
+in vec3 vWorldNormal;
+
+out vec4 FragColor;
+uniform bool uLightMode;
+
+void main() {
+    vec3 N = normalize(vWorldNormal);
+    float isTop = step(0.75, N.y);
+
+    vec3 topBase;
+    vec3 sideBase;
+
+    if (uLightMode) {
+        // 浅色主题 偏亮的工业灰
+        topBase = vec3(0.78, 0.80, 0.84);
+        sideBase = vec3(0.68, 0.70, 0.74);
+    }
+    else {
+        // 深色主题 偏暗的工业灰
+        topBase = vec3(0.30, 0.31, 0.32);
+        sideBase = vec3(0.27, 0.28, 0.29);
+    }
+
+    vec3 baseColor = mix(sideBase, topBase, isTop);
+    FragColor = vec4(clamp(baseColor, 0.0, 1.0), 1.0);
+}