Title demo: the knights come from a forest above ground; lighter meadow, darker trees, no lava above ground

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/gfx.rs

@@ -910,14 +910,16 @@ fn gen_atlas() -> Image {
     for v in 0..2u32 {
         cv.cell(T_LEAVES + v, |x, y| {
             let r = hash(x, y, 430 + v);
-            Some(if r % 5 == 0 { c(30, 70, 30) } else if r % 7 == 0 { c(110, 160, 60) } else if v == 0 { c(56, 110, 44) } else { c(70, 120, 40) })
+            // dark, bluish green: clearly apart from the light meadow
+            Some(if r % 5 == 0 { c(14, 40, 30) } else if r % 7 == 0 { c(52, 96, 62) } else if v == 0 { c(26, 64, 44) } else { c(32, 72, 40) })
         });
     }
     // grass above ground
     for v in 0..4u32 {
         cv.cell(T_GRASS + v, |x, y| {
             let r = hash(x, y, 440 + v);
-            Some(if r % 11 == 0 { c(120, 170, 70) } else if r % 6 == 0 { c(50, 96, 40) } else if r % 23 == 0 { c(200, 190, 90) } else { c(74, 126, 52) })
+            // a light, yellowish meadow with flowers
+            Some(if r % 11 == 0 { c(176, 200, 96) } else if r % 6 == 0 { c(112, 150, 62) } else if r % 23 == 0 { c(236, 220, 110) } else if r % 37 == 0 { c(230, 236, 240) } else { c(140, 176, 78) })
         });
     }
     // obsidian: cooled lava, dark glass with a few glowing seams