Updated ERD and Tech docs

docs/erd.html

@@ -7,27 +7,27 @@
 <link href="https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500;600&family=DM+Sans:wght@400;500;600;700&display=swap" rel="stylesheet">
 <style>
   :root {
-    --bg: #0f1117;
-    --surface: #181a24;
-    --surface-hover: #1e2130;
-    --border: #2a2d3e;
-    --border-highlight: #3d4160;
-    --text: #c9cdd8;
-    --text-muted: #6b7084;
-    --text-bright: #eef0f6;
-    --pk: #f0b866;
-    --pk-bg: rgba(240, 184, 102, 0.08);
-    --fk: #6ea8fe;
-    --fk-bg: rgba(110, 168, 254, 0.08);
-    --col: #8b91a8;
-    --type: #5a5f75;
-    --line-color: #3d5a80;
-    --line-highlight: #6ea8fe;
-    --accent-green: #66d9a0;
-    --accent-red: #f07178;
-    --accent-purple: #c792ea;
-    --shadow: 0 4px 24px rgba(0,0,0,0.4);
-    --shadow-lg: 0 8px 40px rgba(0,0,0,0.6);
+    --bg: #f5f7fb;
+    --surface: #ffffff;
+    --surface-hover: #f0f2f7;
+    --border: #e2e4ed;
+    --border-highlight: #b0b6d0;
+    --text: #374151;
+    --text-muted: #9ca3af;
+    --text-bright: #111827;
+    --pk: #b45309;
+    --pk-bg: rgba(180, 83, 9, 0.08);
+    --fk: #1d4ed8;
+    --fk-bg: rgba(29, 78, 216, 0.08);
+    --col: #4b5563;
+    --type: #9ca3af;
+    --line-color: #94a3b8;
+    --line-highlight: #2563eb;
+    --accent-green: #16a34a;
+    --accent-red: #dc2626;
+    --accent-purple: #7c3aed;
+    --shadow: 0 2px 12px rgba(0,0,0,0.08);
+    --shadow-lg: 0 4px 24px rgba(0,0,0,0.14);
     --radius: 10px;
   }