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diff --git a/src/games/mastervega/VegaDelaunay.js b/src/games/mastervega/VegaDelaunay.js
new file mode 100644
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+++ b/src/games/mastervega/VegaDelaunay.js
@@ -0,0 +1,98 @@
+// Master of Vega — Bowyer-Watson Delaunay triangulation.
+//
+// Pure and Phaser-free (the VegaZoom.js precedent: the deciding half of a UI
+// concern is checkable headlessly even though the drawing half is not). The
+// only consumer today is VegaStarMap.js's range-darkness "controlled space"
+// mesh between a player's own colonies — it needs to know which colonies are
+// geometric neighbors (triangulation edges) and which triples bound a filled
+// face (triangles), without ever connecting colonies that aren't adjacent.
+
+/** Circumcircle of three points, or null if they're (numerically) collinear. */
+function circumcircle(a, b, c) {
+  const d = 2 * (a.x * (b.y - c.y) + b.x * (c.y - a.y) + c.x * (a.y - b.y));
+  if (Math.abs(d) < 1e-9) return null;
+  const aSq = a.x * a.x + a.y * a.y;
+  const bSq = b.x * b.x + b.y * b.y;
+  const cSq = c.x * c.x + c.y * c.y;
+  const ux = (aSq * (b.y - c.y) + bSq * (c.y - a.y) + cSq * (a.y - b.y)) / d;
+  const uy = (aSq * (c.x - b.x) + bSq * (a.x - c.x) + cSq * (b.x - a.x)) / d;
+  const r2 = (a.x - ux) ** 2 + (a.y - uy) ** 2;
+  return { x: ux, y: uy, r2 };
+}
+
+const edgeKey = (u, v) => (u < v ? `${u}_${v}` : `${v}_${u}`);
+
+/**
+ * Delaunay-triangulate `points` ({x,y} array). Returns triangles as index
+ * triples into `points`. Fewer than 3 points has no triangles by
+ * definition — callers that want a single connecting edge for exactly 2
+ * points need to draw that themselves.
+ */
+export function delaunayTriangulate(points) {
+  const n = points.length;
+  if (n < 3) return [];
+
+  let minX = Infinity;
+  let minY = Infinity;
+  let maxX = -Infinity;
+  let maxY = -Infinity;
+  for (const p of points) {
+    minX = Math.min(minX, p.x); minY = Math.min(minY, p.y);
+    maxX = Math.max(maxX, p.x); maxY = Math.max(maxY, p.y);
+  }
+  const spanX = maxX - minX || 1;
+  const spanY = maxY - minY || 1;
+  const midX = (minX + maxX) / 2;
+  const midY = (minY + maxY) / 2;
+  // A super-triangle big enough that no input point can ever sit outside it.
+  const size = Math.max(spanX, spanY) * 20;
+  const pts = [...points,
+    { x: midX - size, y: midY - size },
+    { x: midX + size, y: midY - size },
+    { x: midX, y: midY + size },
+  ];
+  const superIdx = [n, n + 1, n + 2];
+
+  let triangles = [superIdx];
+
+  for (let i = 0; i < n; i += 1) {
+    const p = pts[i];
+    const bad = [];
+    const good = [];
+    for (const tri of triangles) {
+      const cc = circumcircle(pts[tri[0]], pts[tri[1]], pts[tri[2]]);
+      const inside = cc && (p.x - cc.x) ** 2 + (p.y - cc.y) ** 2 <= cc.r2;
+      (inside ? bad : good).push(tri);
+    }
+
+    // The cavity left by removing the bad triangles is bounded by whichever
+    // edges belong to exactly one of them — shared (interior) edges cancel.
+    const edgeCount = new Map();
+    for (const [a, b, c] of bad) {
+      for (const [u, v] of [[a, b], [b, c], [c, a]]) {
+        const key = edgeKey(u, v);
+        edgeCount.set(key, (edgeCount.get(key) || 0) + 1);
+      }
+    }
+    triangles = good;
+    for (const [a, b, c] of bad) {
+      for (const [u, v] of [[a, b], [b, c], [c, a]]) {
+        if (edgeCount.get(edgeKey(u, v)) === 1) triangles.push([u, v, i]);
+      }
+    }
+  }
+
+  return triangles.filter((tri) => tri.every((idx) => idx < n));
+}
+
+/** Unique undirected edges (as [i, j] with i < j) covering a triangle set. */
+export function triangulationEdges(triangles) {
+  const seen = new Map();
+  for (const [a, b, c] of triangles) {
+    for (const [u, v] of [[a, b], [b, c], [c, a]]) {
+      const key = edgeKey(u, v);
+      if (!seen.has(key)) seen.set(key, [Math.min(u, v), Math.max(u, v)]);
+    }
+  }
+  return [...seen.values()];
+}
diff --git a/src/games/mastervega/VegaResearchChoiceScreen.js b/src/games/mastervega/VegaResearchChoiceScreen.js
new file mode 100644
index 0000000..898ec07
--- /dev/null
+++ b/src/games/mastervega/VegaResearchChoiceScreen.js
@@ -0,0 +1,236 @@
+// Master of Vega — the "choose your next technology" prompt. Opened once per
+// field, in turn order, right after a human research completion opens up a
+// genuinely ambiguous rung (2+ live alternatives) — before the New Turn
+// report. See MasterOfVegaGame.pendingResearchChoices()/runToHumanTurn() for
+// the detection and sequencing.
+//
+// The engine has already auto-picked a default (the veteran tech, same as
+// always — see VegaLogic.nextResearchTarget) by the time this screen opens;
+// this screen never shows that pick and immediately discards it
+// (emp.researching[field] = null) so nothing reads as pre-selected. The
+// player's click calls the same zero-cost VegaLogic.setResearchTarget the
+// normal Research screen's tree already uses.
+//
+// Same shell geometry as VegaResearchScreen.js's openResearchScreen (this
+// file duplicates its tree-drawing math rather than sharing it — same
+// "each screen owns its own copy of intricate rendering logic" convention
+// already used for the JIT-video plumbing across VegaAudience.js/
+// VegaColonyIntro.js/VegaResearchScreen.js, to avoid risking a live refactor
+// of the shipped tree renderer).
+
+import * as Phaser from 'phaser';
+import { FONT, D, modalShell } from './VegaScreens.js';
+import { setResearchTarget, fieldTechLevel } from './VegaLogic.js';
+import { buildVideoPanel } from './VegaResearchScreen.js';
+import { Tooltip } from '../../ui/Tooltip.js';
+import { describeTechTooltip } from './VegaTooltips.js';
+
+const ACCENT = 0x6fc4ff;
+const PANEL = 0x0b1220;
+const GOLD = '#ffd88a';
+const GOLD_INT = 0xffd88a;
+
+/** A ring of small dots around (x, y), continuously rotating. */
+function buildRotatingRing(scene, x, y, radius, colourInt, dotCount = 12, dotRadius = 2.5) {
+  const ring = scene.add.container(x, y);
+  for (let i = 0; i < dotCount; i += 1) {
+    const angle = (i / dotCount) * Math.PI * 2;
+    ring.add(scene.add.circle(Math.cos(angle) * radius, Math.sin(angle) * radius, dotRadius, colourInt));
+  }
+  scene.tweens.add({ targets: ring, angle: 360, duration: 3000, repeat: -1, ease: 'Linear' });
+  return ring;
+}
+
+export function openResearchChoiceScreen(scene, rules, state, e, art, field, choices, completedTechId, onClose) {
+  const emp = state.empires[e];
+  const fieldDef = rules.techFields[field];
+  const completedTech = rules.techs[completedTechId];
+
+  // Discard the engine's auto-pick — this screen's whole point is that
+  // nothing is chosen until the player clicks one of the ringed options.
+  emp.researching[field] = null;
+
+  const tooltip = new Tooltip(scene, { depth: D.modal + 5 });
+  const shell = modalShell(scene, 'Choose Your Next Research', () => {
+    tooltip.destroy();
+    onClose?.();
+  }, { width: 1500, height: 880, closable: false });
+
+  // --- layout, identical to openResearchScreen's -----------------------
+  const videoH = shell.body.h;
+  const videoW = Math.round(videoH * (2 / 3));
+  const rightX = shell.body.x + videoW + 24;
+  const rightW = shell.body.w - videoW - 24;
+  const GAP = 16;
+  const boxW = (rightW - 2 * GAP) / 3;
+  const boxH = 200;
+  const gridY = shell.body.y;
+  const gridBottom = gridY + 2 * boxH + GAP;
+  const headingY = gridBottom + 6;
+  const detailY = gridBottom + 34;
+  const detailH = shell.body.h - (detailY - shell.body.y);
+  const detailX = rightX;
+  const detailW = rightW;
+
+  shell.add(buildVideoPanel(scene, rules, art, emp.speciesId, shell.body.x, shell.body.y, videoW, videoH));
+
+  // --- top-right: the completed field's box, read-only -------------------
+  const bx = rightX;
+  const by = gridY;
+  shell.add(scene.add.rectangle(bx + boxW / 2, by + boxH / 2, boxW, boxH, PANEL, 0.6)
+    .setStrokeStyle(1, ACCENT, 0.5));
+
+  const lvl = fieldTechLevel(rules, state, e, field);
+  shell.add(scene.add.text(bx + 12, by + 8, `${fieldDef.name.toUpperCase()} · Lv ${lvl}`, {
+    fontFamily: FONT, fontSize: '18px', color: '#cfe8ff',
+  }));
+
+  // A static, non-interactive stand-in for the allocation slider — the real
+  // slider() widget always wires up its own drag zone, and it's shared by
+  // several other screens that must not be touched, so this is a plain
+  // dimmed track+fill rather than the real thing.
+  shell.add(scene.add.text(bx + 14, by + 42, 'Allocation (locked)', {
+    fontFamily: FONT, fontSize: '17px', color: '#5a708c',
+  }));
+  const trackY = by + 70;
+  shell.add(scene.add.rectangle(bx + 14, trackY, boxW - 28, 8, 0x1b2b42, 0.6).setOrigin(0, 0.5));
+  shell.add(scene.add.rectangle(bx + 14, trackY, (boxW - 28) * (emp.alloc[field] ?? 0), 8, ACCENT, 0.35)
+    .setOrigin(0, 0.5));
+
+  shell.add(scene.add.text(bx + 14, by + 96, 'Select your next technology below.', {
+    fontFamily: FONT, fontSize: '14px', color: '#9fb6cc', wordWrap: { width: boxW - 28 },
+  }));
+
+  // --- remaining top-right space: the notification -----------------------
+  const noteX = bx + boxW + GAP;
+  const noteW = rightX + rightW - noteX;
+  shell.add(scene.add.text(noteX, by + 8, 'RESEARCH COMPLETE', {
+    fontFamily: FONT, fontSize: '22px', color: GOLD,
+  }));
+  shell.add(scene.add.text(noteX, by + 44,
+    `${completedTech.name} is finished. Choose your next ${fieldDef.name} technology `
+    + 'from the highlighted options below.', {
+      fontFamily: FONT, fontSize: '16px', color: '#cfe8ff', wordWrap: { width: noteW }, lineSpacing: 4,
+    }));
+
+  // --- bottom-right: the tree ---------------------------------------------
+  shell.add(scene.add.text(detailX, headingY, `${fieldDef.name.toUpperCase()} — TECH TREE`, {
+    fontFamily: FONT, fontSize: '18px', color: '#cfe8ff',
+  }));
+
+  const bg = scene.add.rectangle(detailX + detailW / 2, detailY + detailH / 2, detailW, detailH, 0x000000, 0.35)
+    .setStrokeStyle(1, ACCENT, 0.3);
+  shell.add(bg);
+
+  const tree = scene.add.container(0, 0);
+  shell.add(tree);
+  const maskG = scene.make.graphics({ x: 0, y: 0, add: false });
+  maskG.fillStyle(0xffffff);
+  maskG.fillRect(detailX, detailY, detailW, detailH);
+  tree.setMask(maskG.createGeometryMask());
+
+  const PAD = 28;
+  const LABEL_H = 20;
+  const NODE = 34;
+  const LANE_STEP = 78;
+  const innerX0 = detailX + PAD;
+  const innerY0 = detailY + PAD;
+  const spineY = innerY0 + LABEL_H + (detailH - 2 * PAD - LABEL_H) / 2;
+  const usableX0 = innerX0 + NODE / 2;
+  const usableX1 = detailX + detailW - PAD - NODE / 2;
+  const rungs = rules.techRungsByField[field];
+  const colStep = (usableX1 - usableX0) / Math.max(1, rungs.length - 1);
+  const nodeX = (i) => usableX0 + i * colStep;
+  const nodeY = (lane) => {
+    if (lane === 0) return spineY;
+    const sign = lane % 2 === 1 ? -1 : 1;
+    return spineY + sign * Math.ceil(lane / 2) * LANE_STEP;
+  };
+
+  const pos = new Map(); // techId -> {x, y}
+  rungs.forEach((rung, i) => {
+    rung.techs.forEach((tech, lane) => pos.set(tech.id, { x: nodeX(i), y: nodeY(lane) }));
+  });
+
+  rungs.forEach((rung, i) => {
+    tree.add(scene.add.text(nodeX(i), innerY0, `T${rung.tier}`, {
+      fontFamily: FONT, fontSize: '12px', color: '#5a708c',
+    }).setOrigin(0.5, 0));
+  });
+
+  // No isCurrent/yellow here — nothing is chosen yet in this screen.
+  const statusColour = (tech) => {
+    if (emp.known[tech.id]) return '#7fd8a0';
+    return emp.available[tech.id] ? '#9fb6cc' : '#5a4450';
+  };
+
+  const edges = scene.add.graphics();
+  tree.add(edges);
+  for (const tech of rules.techsByField[field]) {
+    const prereqId = tech.prereqs[0];
+    if (!prereqId) continue;
+    const from = pos.get(prereqId);
+    const to = pos.get(tech.id);
+    const colourInt = Phaser.Display.Color.HexStringToColor(statusColour(tech)).color;
+    edges.lineStyle(2, colourInt, 0.55);
+    edges.lineBetween(from.x, from.y, to.x, to.y);
+  }
+
+  const choiceIds = new Set(choices.map((t) => t.id));
+  const candidateNodes = new Map(); // techId -> { badge, mark, ring }
+  for (const tech of rules.techsByField[field]) {
+    const known = !!emp.known[tech.id];
+    const colour = statusColour(tech);
+    const mark = known ? '■' : (emp.available[tech.id] ? '□' : '✕');
+    const { x, y } = pos.get(tech.id);
+
+    const badge = scene.add.rectangle(x, y, NODE, NODE, 0x0b1220, 0.9)
+      .setStrokeStyle(1.5, Phaser.Display.Color.HexStringToColor(colour).color, 0.7);
+    tree.add(badge);
+    const markText = scene.add.text(x, y, mark, { fontFamily: FONT, fontSize: '20px', color: colour }).setOrigin(0.5);
+    tree.add(markText);
+    tooltip.attachTo(badge.setInteractive(), () => describeTechTooltip(rules, state, emp, tech));
+
+    if (choiceIds.has(tech.id)) {
+      const ring = buildRotatingRing(scene, x, y, NODE / 2 + 10, ACCENT);
+      tree.add(ring);
+      candidateNodes.set(tech.id, { badge, markText, ring });
+    }
+  }
+
+  // --- selection: shrink every ring, turn the chosen one yellow, persist,
+  // then close once every ring has finished vanishing.
+  let resolved = false;
+  let remaining = candidateNodes.size;
+  const finishAndClose = () => {
+    tooltip.destroy();
+    shell.destroy();
+    onClose?.();
+  };
+  for (const [techId, nodes] of candidateNodes) {
+    nodes.badge.setInteractive({ useHandCursor: true });
+    nodes.badge.on('pointerup', () => {
+      if (resolved) return;
+      resolved = true;
+      setResearchTarget(rules, state, e, field, techId);
+      tooltip.hide();
+      for (const [otherId, otherNodes] of candidateNodes) {
+        if (otherId === techId) {
+          otherNodes.badge.setStrokeStyle(2.5, GOLD_INT, 1);
+          otherNodes.markText.setColor(GOLD);
+        }
+        otherNodes.badge.disableInteractive();
+        scene.tweens.add({
+          targets: otherNodes.ring, scale: 0, alpha: 0, duration: 600, ease: 'Cubic.easeIn',
+          onComplete: () => {
+            otherNodes.ring.destroy();
+            remaining -= 1;
+            if (remaining === 0) scene.time.delayedCall(150, finishAndClose);
+          },
+        });
+      }
+    });
+  }
+
+  return shell;
+}