Make forest green the page background per client feedback

Marisol expected forest green as the actual site background, not just
an accent. Paper/paper-raised now carry the green, ink shifts to a
warm cream for contrast, and link/border colors are retuned to stay
legible against the darker backdrop in both modes.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

assets/css/style.css

@@ -1,14 +1,14 @@
 :root {
-  --paper: #F1EAD9;
-  --paper-raised: #F8F2E5;
-  --ink: #2B2015;
-  --ink-soft: #5E5040;
-  --sage: #2F5D34;
-  --sage-soft: #4F7A46;
+  --paper: #2C4F2F;
+  --paper-raised: #375E3B;
+  --ink: #F3EEDC;
+  --ink-soft: #CBC1A2;
+  --sage: #A9C99B;
+  --sage-soft: #C3DBB2;
   --clay: #7A4A28;
   --sun: #E7A62E;
   --sun-ink: #2E2008;
-  --line: #DDCFB0;
+  --line: #4F7048;
   --ok: #2F5D34;
   --ok-bg: #E0EAD9;
   --low: #B4790C;
@@ -19,16 +19,16 @@
 
 @media (prefers-color-scheme: dark) {
   :root {
-    --paper: #1B160E;
-    --paper-raised: #241E14;
-    --ink: #ECE2CB;
-    --ink-soft: #B7A88A;
-    --sage: #7EAE6C;
-    --sage-soft: #669157;
+    --paper: #14241A;
+    --paper-raised: #1C3020;
+    --ink: #ECE4CD;
+    --ink-soft: #B4A88A;
+    --sage: #8FBB78;
+    --sage-soft: #A6CB90;
     --clay: #A8672E;
     --sun: #D9A73A;
     --sun-ink: #241905;
-    --line: #3A2E1B;
+    --line: #2A4527;
     --ok: #8FBB8C;
     --ok-bg: #253524;
     --low: #E0B23E;