style: update dark theme colors in CSS and remove accent color from Tailwind config

Author: skyhancloud

styles/main.css

@@ -15,16 +15,15 @@ html, body {
   --light-text-tertiary: 108, 117, 125;
   --light-text-placeholder: 133, 138, 141;
   --light-border-primary: 204, 204, 204;
-  --dark-bg-background: 15, 15, 20;
-  --dark-bg-secondary: 22, 22, 30;
-  --dark-bg-tertiary: 30, 30, 40;
-  --dark-bg-quaternary: 40, 40, 50;
-  --dark-text-primary: 235, 235, 245;
-  --dark-text-secondary: 200, 200, 210;
-  --dark-text-tertiary: 160, 160, 170;
-  --dark-text-placeholder: 130, 130, 140;
-  --dark-border-primary: 34, 34, 47;
-  --accent-color: 102, 72, 236;
+  --dark-bg-background: 10, 10, 15;
+  --dark-bg-secondary: 18, 18, 24;
+  --dark-bg-tertiary: 28, 28, 38;
+  --dark-bg-quaternary: 38, 38, 48;
+  --dark-text-primary: 240, 240, 245;
+  --dark-text-secondary: 210, 210, 220;
+  --dark-text-tertiary: 170, 170, 180;
+  --dark-text-placeholder: 140, 140, 150;
+  --dark-border-primary: 50, 50, 65;
   transition-property: opacity, filter;
   transition-timing-function: ease-in-out;
   transition-duration: 500ms;

tailwind.config.ts

@@ -29,9 +29,6 @@ export default {
           to: { transform: 'translateY(calc(-100% - var(--gap)))' }
         }
       },
-      colors: {
-        accent: 'rgba(var(--accent-color))'
-      },
       fontFamily: {
         geist: ['var(--font-geist-sans)', 'sans'],
         bricolageGrotesque: ['var(--font-bricolage-grotesque)', 'sans']