🐛 fix(home): set dark colors in [data-md-color-scheme='default'] block

THE REAL ROOT CAUSE after 8 failed attempts:

Old extra.css [data-md-color-scheme='default'] had LIGHT purple
background colors (#f6f0ff) — text was visible on light bg.
When we restored old CSS onto a dark background, the 'default'
block didn't override --md-typeset-color, so MkDocs Material
used its internal default: rgba(0,0,0,0.87) — dark text on
#0a0a1a dark background = invisible.

Fix: override ALL color variables in 'default' block same as 'slate'.

Author: ouyangyipeng

docs/stylesheets/extra.css

@@ -1,13 +1,19 @@
 [data-md-color-scheme='default'] {
-  --md-primary-fg-color: #4c1d95;
-  --md-primary-fg-color--light: #6d28d9;
-  --md-primary-fg-color--dark: #2e1065;
-  --md-accent-fg-color: #7c3aed;
-  --md-accent-fg-color--transparent: rgba(124, 58, 237, 0.12);
-  --yat-hero-start: #f6f0ff;
-  --yat-hero-end: #efe3ff;
-  --yat-border: rgba(76, 29, 149, 0.12);
-  --yat-shadow: 0 20px 48px rgba(76, 29, 149, 0.12);
+  --md-hue: 266;
+  --md-primary-fg-color: #6c5ce7;
+  --md-primary-fg-color--light: #8b7cf0;
+  --md-primary-fg-color--dark: #4c3ab3;
+  --md-accent-fg-color: #00d4ff;
+  --md-accent-fg-color--transparent: rgba(0, 212, 255, 0.12);
+  --md-default-bg-color: #0a0a1a;
+  --md-default-fg-color: #a0a0b8;
+  --md-default-fg-color--light: #6b6b80;
+  --md-typeset-color: #a0a0b8;
+  --md-typeset-a-color: #a78bfa;
+  --yat-hero-start: #120a20;
+  --yat-hero-end: #1b1030;
+  --yat-border: rgba(255, 255, 255, 0.06);
+  --yat-shadow: 0 24px 60px rgba(0, 0, 0, 0.32);
 }
 
 [data-md-color-scheme='slate'] {

mkdocs.yml

@@ -9,8 +9,8 @@ theme:
   logo: img/nexa-logo-noframe.png
   favicon: img/nexa-logo.png
   font:
-    text: false
-    code: false
+    text: Roboto
+    code: Roboto Mono
   palette:
   - media: '(prefers-color-scheme: light)'
     scheme: default