fix: Lighten all text colors site-wide for dark background visibility

Brighten --text-secondary (#b8c1ec -> #e0e6f6) and --text-light
(#8892b8 -> #cdd4ea) CSS variables. Also lighten default link color
from --primary-color to --primary-light for better contrast. Bump
CSS cache to v5.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: danribes

css/style.css

@@ -12,8 +12,8 @@
     --accent-color: #43e97b;
     --accent-dark: #38f9d7;
     --text-primary: #ffffff;
-    --text-secondary: #b8c1ec;
-    --text-light: #8892b8;
+    --text-secondary: #e0e6f6;
+    --text-light: #cdd4ea;
     --bg-primary: #0f1419;
     --bg-secondary: #1a1d29;
     --bg-tertiary: #252a3a;
@@ -169,12 +169,12 @@ p {
 
 a {
     text-decoration: none;
-    color: var(--primary-color);
+    color: var(--primary-light);
     transition: all var(--transition-fast);
 }
 
 a:hover {
-    color: var(--primary-dark);
+    color: #a8b8ff;
 }
 
 ul {

index.html

@@ -7,7 +7,7 @@
     <meta name="keywords" content="health economist, HEOR, HTA, market access, economic modeling, health technology assessment">
     <meta name="author" content="Daniel Ribes">
     <title>Daniel Ribes - Senior Health Economist | HEOR & Market Access Expert</title>
-    <link rel="stylesheet" href="css/style.css?v=4">
+    <link rel="stylesheet" href="css/style.css?v=5">
     <link rel="preconnect" href="https://fonts.googleapis.com">
     <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
     <link href="https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Poppins:wght@600;700&display=swap" rel="stylesheet">