styles: fix --main oklch value (100 → 1)

Tailwind/CSS parser was normalizing the bare `100` lightness to
`10000%`, which is out of range — browsers fell back to the SVG
default (black), making the white logo invisible on the dark hero.

src/styles/globals.css

@@ -2,7 +2,7 @@
 @import "tailwindcss";
 
 :root {
-  --main: oklch(100 0 0);
+  --main: oklch(1 0 0);
   --secondary: oklch(0.85 0 0);
   --brand: oklch(0.5609 0.2483 280.67);
   --neutral: oklch(0.155 0.0395 285.68);