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+# Phase 6 — Visual Effects (Compositor Features)
+
+---
+
+## Step 6.1 — Window decorations (title bars)
+
+For each managed window, draw a simple title bar above it:
+- A colored rectangle.
+- The window title (from `WM_NAME` or `_NET_WM_NAME` property).
+- A close button (clickable, sends `WM_DELETE_WINDOW`).
+
+Use raylib's `DrawRectangle()` and `DrawText()`.
+
+**Verify:** Each window has a title bar showing its name. Clicking the
+close button closes the window.
+
+---
+
+## Step 6.2 — Drop shadows
+
+Draw a soft shadow behind each window. Approach:
+- Precompute a shadow texture (gaussian blur of a solid rect) at startup.
+- Draw it as a 9-slice scaled quad behind each window, offset down and
+  right by a few pixels.
+
+Or use raylib's shader system with a blur shader on an expanded quad.
+
+**Verify:** Each window has a soft drop shadow. Overlapping windows show
+correct shadow layering.
+
+---
+
+## Step 6.3 — Window transparency / opacity
+
+Read `_NET_WM_WINDOW_OPACITY` from each window's properties. Apply it
+when drawing the texture (raylib's `DrawTexturePro` with tint alpha, or
+a custom shader uniform).
+
+**Verify:** Run:
+```bash
+DISPLAY=:1 xprop -f _NET_WM_WINDOW_OPACITY 32c \
+    -set _NET_WM_WINDOW_OPACITY 0x7FFFFFFF -id <wid>
+```
+to set 50% opacity on a window. It becomes translucent in the compositor.