feat(theme): add signal blacksite design tokens

app/globals.css

@@ -72,6 +72,21 @@
     from { opacity: 0; transform: translateY(24px); }
     to { opacity: 1; transform: translateY(0); }
   }
+
+  /* Signal Blacksite */
+  --color-blacksite-bg: #030506;
+  --color-blacksite-bg2: #07090a;
+  --color-blacksite-surface: #101517;
+  --color-blacksite-surface2: #171d21;
+  --color-blacksite-surface3: #20282d;
+  --color-blacksite-text: #f4f7f8;
+  --color-blacksite-muted: #8b949a;
+  --color-blacksite-faint: #5f696f;
+  --color-blacksite-line: #2c353a;
+  --color-signal-cyan: #00f0ff;
+  --color-signal-orange: #ff5a1f;
+  --color-signal-green: #b6ff00;
+  --color-signal-violet: #805dff;
 }
 
 @layer base {
@@ -171,6 +186,14 @@
   opacity: 0.22;
 }
 
+.section-label {
+  font: var(--font-mono);
+  font-size: 11px;
+  letter-spacing: 0.16em;
+  text-transform: uppercase;
+  color: var(--color-blacksite-muted);
+}
+
 .empty-state {
   display: grid;
   gap: 0.75rem;