feat(brand): add logo SVG files and brand guidelines

README.md

@@ -1,6 +1,8 @@
 <div align="center">
 
-  # Konduit
+  <img src="logo-horizontal.svg" alt="Konduit" height="52"/>
+
+  <br/><br/>
 
   **TCP-Native VPN. Works Where UDP Doesn't.**
 
@@ -98,6 +100,39 @@ The VPN server, management UI, and stealth-mode protocol are proprietary. Keepin
 
 ---
 
+## Brand
+
+### Logo
+
+The Konduit mark is a geometric K built from flat filled polygons. An acid-green arrowhead (`>`) is embedded at the junction of the two K arms — it communicates data routing direction and doubles as the middle stroke of the letter E (founder's initials, E·K).
+
+| File | Use |
+|---|---|
+| `logo.svg` | Mark only — light backgrounds |
+| `logo-dark.svg` | Mark only — dark backgrounds |
+| `logo-horizontal.svg` | Mark + wordmark — light backgrounds |
+| `logo-horizontal-dark.svg` | Mark + wordmark — dark backgrounds |
+
+### Colour Palette
+
+| Role | Hex |
+|---|---|
+| Primary (mark) | `#111111` |
+| Accent (arrow) | `#A3E635` |
+| On dark (mark) | `#FFFFFF` |
+
+The acid green `#A3E635` is the signature colour. It appears exclusively as the arrowhead accent and must not be changed between light and dark variants.
+
+### Typography
+
+Wordmark: **Inter** (or Helvetica Neue / SF Pro as system fallback), weight 600, letter-spacing −0.04em, all lowercase.
+
+### Design Language
+
+Flat, geometric, no gradients or shadows. Swiss modernist influence — precision over decoration. The mark works at 24px and scales to billboard size without modification.
+
+---
+
 ## About
 
 Created by **Eugen Kaparulin**.