diff --git a/STATUS.md b/STATUS.md
index 8d95cff..3b9b0f9 100644
--- a/STATUS.md
+++ b/STATUS.md
@@ -4,9 +4,9 @@ Single source of truth for "what's next." One milestone per PR/run. Autopilot:
 pick the one task under **NEXT**, ship it, stop. Do **not** start anything under
 **BLOCKED**.
 
-_Last updated: 2026-07-04 — Milestone 6 (Web Worker WASM inference) done; a
-user-directed polish item (boot loading bar) landed on top; queue empty pending
-an M7 proposal._
+_Last updated: 2026-07-04 — Milestone 6 (Web Worker WASM inference) done; two
+user-directed polish items (boot loading bar, then a black+green "coding"
+aesthetic) landed on top; queue empty pending an M7 proposal._
 
 ---
 
@@ -176,6 +176,25 @@ an M7 proposal._
   dismissal was verified RED on the second assertion). Verified visually on a
   real build (frozen-loader screenshot). Pre-change HEAD (rollback) `789d6ae`.
 
+- **Polish — black + green "coding" aesthetic (user-directed, not a milestone).**
+  Restyled the whole UI to a phosphor-green-on-black terminal look. `src/style.css`
+  gains `--accent` (`#00ff9c`) / `--accent-dim` / `--mono` (monospace stack)
+  custom properties driving the `#controls` panel, slider labels+thumbs
+  (`accent-color`), the webcam/`::file-selector-button` buttons, `#status`, and
+  the `#hud` — all green, monospace, with a soft green outer glow on the panel.
+  `index.html`'s inline boot-loader CSS goes green (title + track + fill + glow),
+  monospace. `src/main.js`'s pre-upload point-cloud tint flips from blue-white
+  `(0.55, 0.78, 1.0)` to phosphor green `(0.15, 1.0, 0.45)` — the one
+  JS-observable change; **post-upload color still samples the image** (M3 path
+  untouched). `#device-note` stays amber on purpose (a caution signal that must
+  read distinctly against the green). Geometry, material identity, uniforms, the
+  render loop, and the M4 decoupling machinery are byte-unchanged. Smoke test
+  asserts the pre-upload `aColor` reads green (G>0.8, G dominant) — proven
+  non-tautological (RED on the old blue tint: G=0.78 fails G>0.8, and B=1.0
+  dominates). Verified visually on a real build (green splat cloud + green HUD,
+  30.7fps). Deployed to the linked Netlify site (`live-depth-field`).
+  Pre-change HEAD (rollback) `d455809`.
+
 **Carry-over facts from M3/M4 (do not re-derive):**
 
 - Depth output contract: `depth` RawImage, Uint8, 1 channel, input W×H, 0–255
diff --git a/index.html b/index.html
index d3ad854..bb2924b 100644
--- a/index.html
+++ b/index.html
@@ -31,24 +31,26 @@
         pointer-events: none;
       }
       #boot-loader .boot-title {
-        font: 600 13px/1 system-ui, sans-serif;
-        letter-spacing: 0.14em;
+        font: 600 13px/1 'JetBrains Mono', 'Fira Code', ui-monospace, Menlo,
+          Consolas, monospace;
+        letter-spacing: 0.18em;
         text-transform: uppercase;
-        color: #8fb7ee;
+        color: #00ff9c;
+        text-shadow: 0 0 12px rgba(0, 255, 156, 0.6);
       }
       #boot-loader .boot-track {
         width: 220px;
         height: 4px;
         border-radius: 4px;
-        background: rgba(255, 255, 255, 0.12);
+        background: rgba(0, 255, 156, 0.14);
         overflow: hidden;
       }
       #boot-loader .boot-fill {
         width: 0;
         height: 100%;
         border-radius: 4px;
-        background: linear-gradient(90deg, #5a8fd6, #8ec7ff);
-        box-shadow: 0 0 12px rgba(142, 199, 255, 0.7);
+        background: linear-gradient(90deg, #00b36b, #00ff9c);
+        box-shadow: 0 0 12px rgba(0, 255, 156, 0.75);
         animation: boot-advance 2.4s cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
         transition: width 0.3s ease;
       }
diff --git a/src/main.js b/src/main.js
index 3e840f0..2de869e 100644
--- a/src/main.js
+++ b/src/main.js
@@ -54,14 +54,15 @@ const cloudGeometry = new THREE.BufferGeometry();
 cloudGeometry.setAttribute('position', new THREE.BufferAttribute(positions, 3));
 
 // Milestone 3: per-point color, sampled from the uploaded photo. Initialized to
-// the M2 blue-white glow tint so the pre-upload cloud renders exactly as M2 did.
-// (Named `aColor`, not `color` — Three injects its own `color` attribute
-// declaration when vertexColors is on, and we manage this one ourselves.)
+// a phosphor-green glow tint — the app's black+green "coding" accent — so the
+// pre-upload cloud reads as a terminal-green splat field. (Named `aColor`, not
+// `color` — Three injects its own `color` attribute declaration when
+// vertexColors is on, and we manage this one ourselves.)
 const colors = new Float32Array(GRID * GRID * 3);
 for (let i = 0; i < colors.length; i += 3) {
-  colors[i] = 0.55;
-  colors[i + 1] = 0.78;
-  colors[i + 2] = 1.0;
+  colors[i] = 0.15;
+  colors[i + 1] = 1.0;
+  colors[i + 2] = 0.45;
 }
 cloudGeometry.setAttribute('aColor', new THREE.BufferAttribute(colors, 3));
 
diff --git a/src/style.css b/src/style.css
index 34694a3..29eeb2e 100644
--- a/src/style.css
+++ b/src/style.css
@@ -1,3 +1,13 @@
+/* Black + green "coding" aesthetic. A phosphor-green HUD on a pure-black stage,
+   monospace throughout, so the whole tool reads like a terminal. --accent is the
+   bright phosphor green; --accent-dim the calmer readout green. */
+:root {
+  --mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', ui-monospace, 'Cascadia Code',
+    Menlo, Consolas, monospace;
+  --accent: #00ff9c;
+  --accent-dim: #3fd68a;
+}
+
 html,
 body {
   margin: 0;
@@ -17,13 +27,14 @@ canvas {
   top: 12px;
   left: 12px;
   padding: 10px 12px;
-  background: rgba(20, 22, 28, 0.6);
-  border: 1px solid rgba(255, 255, 255, 0.12);
+  background: rgba(0, 12, 6, 0.62);
+  border: 1px solid rgba(0, 255, 156, 0.28);
   border-radius: 8px;
-  font: 12px/1.4 system-ui, sans-serif;
-  color: #cdd3df;
+  font: 12px/1.4 var(--mono);
+  color: var(--accent-dim);
   user-select: none;
   backdrop-filter: blur(4px);
+  box-shadow: 0 0 20px rgba(0, 255, 156, 0.12), inset 0 0 24px rgba(0, 255, 156, 0.04);
 }
 
 #controls .ctrl-row {
@@ -35,10 +46,35 @@ canvas {
 
 #controls .ctrl-row span {
   width: 52px;
+  color: var(--accent);
+  letter-spacing: 0.06em;
 }
 
 #controls input[type='range'] {
   width: 130px;
+  accent-color: var(--accent);
+}
+
+#controls button {
+  font: inherit;
+  color: var(--accent);
+  background: rgba(0, 255, 156, 0.08);
+  border: 1px solid rgba(0, 255, 156, 0.4);
+  border-radius: 5px;
+  padding: 4px 10px;
+  cursor: pointer;
+  letter-spacing: 0.04em;
+  transition: background 0.15s ease, box-shadow 0.15s ease;
+}
+
+#controls button:hover:not(:disabled) {
+  background: rgba(0, 255, 156, 0.18);
+  box-shadow: 0 0 10px rgba(0, 255, 156, 0.35);
+}
+
+#controls button:disabled {
+  opacity: 0.5;
+  cursor: default;
 }
 
 /* Milestone 3: photo upload + async depth status line. */
@@ -46,23 +82,37 @@ canvas {
   margin-top: 6px;
   max-width: 200px;
   font-size: 11px;
-  color: #cdd3df;
+  font-family: var(--mono);
+  color: var(--accent-dim);
+}
+
+#controls input[type='file']::file-selector-button {
+  font: 11px var(--mono);
+  color: var(--accent);
+  background: rgba(0, 255, 156, 0.08);
+  border: 1px solid rgba(0, 255, 156, 0.4);
+  border-radius: 5px;
+  padding: 3px 8px;
+  margin-right: 8px;
+  cursor: pointer;
 }
 
 #status {
   margin-top: 6px;
   max-width: 210px;
-  color: #9fb4d8;
+  color: var(--accent-dim);
 }
 
 /* Milestone 5: FPS / inference readouts + the WASM slower-device warning. */
 #hud {
   margin-top: 6px;
   padding-top: 6px;
-  border-top: 1px solid rgba(255, 255, 255, 0.12);
-  color: #9fb4d8;
+  border-top: 1px solid rgba(0, 255, 156, 0.2);
+  color: var(--accent-dim);
 }
 
+/* WASM slower-device warning: kept amber on purpose — a caution signal that
+   reads distinctly against the green so it never blends into the HUD. */
 #device-note {
   max-width: 210px;
   color: #e8c46a;
diff --git a/tests/smoke.spec.js b/tests/smoke.spec.js
index 127e59f..0d29b7a 100644
--- a/tests/smoke.spec.js
+++ b/tests/smoke.spec.js
@@ -685,6 +685,38 @@ test('boot loader: shipped in the initial HTML before JS, dismissed once the app
   expect(errors, `unexpected page errors:\n${errors.join('\n')}`).toEqual([]);
 });
 
+// Polish — black + green "coding" aesthetic (user-directed, not a milestone).
+// The one JS-observable part of the restyle is the pre-upload point-cloud tint:
+// before any photo/webcam upload, the cloud renders in the app's accent color.
+// A green coding aesthetic means that default tint reads GREEN — the green
+// channel dominates and is strong. (Post-upload the cloud is colored from the
+// image; this asserts only the default fill, so the M3 image-color path is
+// untouched.) Non-tautological: RED on the prior blue-white (0.55, 0.78, 1.0)
+// tint where blue dominates; green only once the tint is changed.
+test('aesthetic: pre-upload cloud tint reads green (coding aesthetic)', async ({ page }) => {
+  const errors = [];
+  page.on('pageerror', (e) => errors.push(`pageerror: ${e}`));
+  page.on('console', (m) => {
+    if (m.type() === 'error') errors.push(`console.error: ${m.text()}`);
+  });
+  await page.goto('/');
+  await page.waitForFunction(() => window.__app?.getPointCount() === 128 * 128);
+
+  const tint = await page.evaluate(() => {
+    let cloud = null;
+    window.__app.scene.traverse((o) => {
+      if (o.isPoints) cloud = o;
+    });
+    const col = cloud.geometry.attributes.aColor;
+    return { r: col.getX(0), g: col.getY(0), b: col.getZ(0) };
+  });
+  // Green channel dominates and is strong — a green cloud, not blue-white.
+  expect(tint.g, 'green channel must be strong').toBeGreaterThan(0.8);
+  expect(tint.g, 'green must dominate red').toBeGreaterThan(tint.r);
+  expect(tint.g, 'green must dominate blue').toBeGreaterThan(tint.b);
+  expect(errors, `unexpected page errors:\n${errors.join('\n')}`).toEqual([]);
+});
+
 // Milestone 6: WASM inference moves into a Web Worker so the main thread stays
 // responsive during a pass. The worker itself can't run in CI (it loads the
 // real ~100MB model — the worker-path proof is a local real-model probe, like