Improve road curve smoothness (C1 sin^2 curve) and crisp road surface/curb contrast

config/roads.yaml

@@ -1,7 +1,7 @@
 # Road System Configuration
 default_road_type: "dirt"
 build_duration_ticks: 2
-meander_amplitude: 0.065
+meander_amplitude: 0.025
 meander_subdivisions: 6
 
 types:
@@ -9,35 +9,35 @@ types:
     id: "dirt"
     name: "Dirt Road"
     speed_multiplier: 1.30    # +30% movement speed
-    color: "#c49a62"
-    border_color: "#6b4b23"
+    color: "#d8b480"
+    border_color: "#52381c"
     width: 3.5
-    world_width: 0.068
-    border_width: 0.022
-    texture_scale: 2.4
-    opacity: 0.90
+    world_width: 0.056
+    border_width: 0.012
+    texture_scale: 4.5
+    opacity: 0.96
     cost: 5
   stone:
     id: "stone"
     name: "Stone Road"
     speed_multiplier: 1.60    # +60% movement speed
-    color: "#9aa1a8"
-    border_color: "#464b50"
+    color: "#c2beb6"
+    border_color: "#46484c"
     width: 4.0
-    world_width: 0.078
-    border_width: 0.020
-    texture_scale: 2.8
-    opacity: 0.94
+    world_width: 0.064
+    border_width: 0.012
+    texture_scale: 5.5
+    opacity: 0.98
     cost: 15
   rail:
     id: "rail"
     name: "Railroad"
     speed_multiplier: 2.50    # +150% movement speed
-    color: "#3a3c40"
-    border_color: "#181a1c"
+    color: "#4a4e54"
+    border_color: "#22252a"
     width: 4.5
-    world_width: 0.086
-    border_width: 0.024
-    texture_scale: 3.0
-    opacity: 0.96
+    world_width: 0.070
+    border_width: 0.014
+    texture_scale: 6.0
+    opacity: 0.98
     cost: 30