commit a5f686510fe0eed2cdabae71738600575e6e150f
Author: FlatHack <steven.noah@outlook.com>
Date:   Thu Jun 18 10:27:16 2026 +0200

    Initial REM planning editor

diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..a98f70f
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,16 @@
+FROM node:24-alpine
+
+WORKDIR /app
+
+COPY package.json ./
+COPY server.mjs ./
+COPY star-map.html ./
+
+ENV HOST=0.0.0.0
+ENV PORT=3000
+ENV DATA_DIR=/data
+
+VOLUME ["/data"]
+EXPOSE 3000
+
+CMD ["node", "server.mjs"]
diff --git a/build-universe-map.mjs b/build-universe-map.mjs
new file mode 100644
index 0000000..6955798
--- /dev/null
+++ b/build-universe-map.mjs
@@ -0,0 +1,257 @@
+import { readFile, writeFile, mkdir } from "node:fs/promises";
+import { dirname, join, resolve } from "node:path";
+import { fileURLToPath } from "node:url";
+
+const projectDir = dirname(fileURLToPath(import.meta.url));
+
+const systemNames = {
+  li01: "New York",
+  li02: "California",
+  li03: "Colorado",
+  li04: "Texas",
+  li05: "Alaska",
+  li06: "New Nevada",
+  li07: "Puerto Rico",
+  br01: "New London",
+  br02: "Cambridge",
+  br03: "Manchester",
+  br04: "Leeds",
+  br05: "Edinburgh",
+  br06: "Dublin",
+  ku01: "New Tokyo",
+  ku02: "Shikoku",
+  ku03: "Kyushu",
+  ku04: "Honshu",
+  ku05: "Hokkaido",
+  ku06: "Chugoku",
+  ku07: "Tohoku",
+  rh01: "New Berlin",
+  rh02: "Frankfurt",
+  rh03: "Stuttgart",
+  rh04: "Hamburg",
+  rh05: "Dresden",
+  iw01: "Bering",
+  iw02: "Hudson",
+  iw03: "Magellan",
+  iw04: "Cortez",
+  iw05: "Kepler",
+  iw06: "Galileo",
+  bw01: "Omega-3",
+  bw02: "Omega-5",
+  bw03: "Omega-7",
+  bw04: "Omega-11",
+  bw05: "Omega-41",
+  bw06: "Sigma-13",
+  bw07: "Sigma-17",
+  bw08: "Sigma-19",
+  bw09: "Tau-31",
+  bw10: "Tau-29",
+  bw11: "Sigma 2",
+  ew01: "Tau-37",
+  ew02: "Omicron Alpha",
+  ew03: "Omicron Gamma",
+  ew04: "Omicron Theta",
+  ew05: "Unknown Gamma",
+  ew06: "Unknown Delta",
+  hi01: "Unknown Alpha",
+  hi02: "Omicron Beta",
+  st01: "Omicron Minor",
+  st02: "Omicron Beta",
+  st02c: "Unknown Beta",
+  st03: "Omicron Major",
+  st03b: "Omicron Major",
+  st04: "Omicron Lambda",
+  st05: "Omicron Prime",
+  fp7_system: "Omicron Major"
+};
+
+function stripComment(line) {
+  return line.replace(/;.*/, "").trim();
+}
+
+function parseIniBlocks(text) {
+  const blocks = [];
+  let current = null;
+
+  for (const rawLine of text.split(/\r?\n/)) {
+    const line = stripComment(rawLine);
+    if (!line) {
+      continue;
+    }
+
+    const header = line.match(/^\[([^\]]+)]$/);
+    if (header) {
+      current = { section: header[1].toLowerCase(), values: {} };
+      blocks.push(current);
+      continue;
+    }
+
+    if (!current) {
+      continue;
+    }
+
+    const pair = line.match(/^([^=]+?)\s*=\s*(.*)$/);
+    if (!pair) {
+      continue;
+    }
+    const key = pair[1].trim().toLowerCase();
+    const value = pair[2].trim();
+    if (!current.values[key]) {
+      current.values[key] = [];
+    }
+    current.values[key].push(value);
+  }
+
+  return blocks;
+}
+
+function firstValue(block, key) {
+  return block.values[key]?.[0];
+}
+
+function parseGridPosition(value) {
+  const parts = value.split(",").map((part) => Number(part.trim()));
+  if (parts.length < 2 || !Number.isFinite(parts[0]) || !Number.isFinite(parts[1])) {
+    throw new Error(`Invalid system pos: ${value}`);
+  }
+  return { gridX: parts[0], gridY: parts[1] };
+}
+
+function makeConnectionId(from, to) {
+  return `c-${from}-${to}`;
+}
+
+function normalizePair(from, to) {
+  return [from, to].sort((a, b) => a.localeCompare(b)).join("|");
+}
+
+async function readDirectConnections(universeDir, systemsById) {
+  const connections = [];
+  const seen = new Set();
+
+  for (const system of systemsById.values()) {
+    const systemFile = resolve(universeDir, system.file.replaceAll("\\", "/"));
+    let text;
+    try {
+      text = await readFile(systemFile, "utf8");
+    } catch {
+      continue;
+    }
+
+    for (const block of parseIniBlocks(text)) {
+      if (block.section !== "object") {
+        continue;
+      }
+      const gotoValues = block.values.goto || [];
+      const archetype = (firstValue(block, "archetype") || "").toLowerCase();
+      const type = archetype.includes("hole") ? "neutral" : "standard";
+
+      for (const gotoValue of gotoValues) {
+        const targetId = gotoValue.split(",")[0]?.trim().toLowerCase();
+        if (!targetId || !systemsById.has(targetId) || targetId === system.id) {
+          continue;
+        }
+        const key = normalizePair(system.id, targetId);
+        if (seen.has(key)) {
+          continue;
+        }
+        seen.add(key);
+        const [from, to] = key.split("|");
+        connections.push({
+          id: makeConnectionId(from, to),
+          from,
+          to,
+          type
+        });
+      }
+    }
+  }
+
+  return connections.sort((a, b) => a.id.localeCompare(b.id));
+}
+
+export async function buildUniverseMap(options = {}) {
+  const universeDir = options.universeDir || "C:/PROJECTS/REM/REM-Mod/DATA/UNIVERSE";
+  const universePath = join(universeDir, "universe.ini");
+  const text = await readFile(universePath, "utf8");
+  const systemBlocks = parseIniBlocks(text).filter((block) => block.section === "system");
+  const parsedSystems = systemBlocks.map((block) => {
+    const nickname = firstValue(block, "nickname");
+    const file = firstValue(block, "file");
+    const pos = firstValue(block, "pos");
+    if (!nickname || !file || !pos) {
+      throw new Error("System block is missing nickname/file/pos");
+    }
+    const id = nickname.toLowerCase();
+    const { gridX, gridY } = parseGridPosition(pos);
+    return {
+      id,
+      nickname,
+      name: systemNames[id] || nickname,
+      file,
+      gridX,
+      gridY,
+      stridName: Number(firstValue(block, "strid_name") || 0),
+      navMapScale: Number(firstValue(block, "navmapscale") || 1),
+      visit: Number(firstValue(block, "visit") || 0),
+      note: ""
+    };
+  });
+
+  const minCol = Math.min(...parsedSystems.map((system) => system.gridX));
+  const minRow = Math.min(...parsedSystems.map((system) => system.gridY));
+  const maxCol = Math.max(...parsedSystems.map((system) => system.gridX));
+  const maxRow = Math.max(...parsedSystems.map((system) => system.gridY));
+  const cellSize = 72;
+  const margin = 72;
+  const grid = { minCol, minRow, maxCol, maxRow, cellSize, margin };
+
+  const systems = parsedSystems.map((system) => ({
+    ...system,
+    x: margin + (system.gridX - minCol) * cellSize,
+    y: margin + (system.gridY - minRow) * cellSize
+  })).sort((a, b) => a.name.localeCompare(b.name) || a.id.localeCompare(b.id));
+
+  const systemsById = new Map(systems.map((system) => [system.id, system]));
+  const connections = await readDirectConnections(universeDir, systemsById);
+
+  return {
+    source: "universe.ini",
+    background: "#05080f",
+    grid,
+    viewBox: {
+      x: 0,
+      y: 0,
+      width: margin * 2 + (maxCol - minCol) * cellSize,
+      height: margin * 2 + (maxRow - minRow) * cellSize
+    },
+    systems,
+    connections
+  };
+}
+
+async function updateProjectFiles() {
+  const mapData = await buildUniverseMap();
+  const htmlPath = join(projectDir, "star-map.html");
+  const dataPath = join(projectDir, "data", "map.json");
+  const html = await readFile(htmlPath, "utf8");
+  const json = JSON.stringify(mapData, null, 2);
+  const nextHtml = html.replace(
+    /<script type="application\/json" id="initial-map-data">[\s\S]*?<\/script>/,
+    `<script type="application/json" id="initial-map-data">\n${json}\n  </script>`
+  );
+
+  if (nextHtml === html) {
+    throw new Error("Could not replace initial-map-data in star-map.html");
+  }
+
+  await writeFile(htmlPath, nextHtml, "utf8");
+  await mkdir(dirname(dataPath), { recursive: true });
+  await writeFile(dataPath, `${json}\n`, "utf8");
+  return mapData;
+}
+
+if (process.argv[1] && resolve(process.argv[1]) === fileURLToPath(import.meta.url)) {
+  const mapData = await updateProjectFiles();
+  console.log(`Imported ${mapData.systems.length} systems and ${mapData.connections.length} connections from universe.ini`);
+}
diff --git a/data/map.json b/data/map.json
new file mode 100644
index 0000000..231a7c3
--- /dev/null
+++ b/data/map.json
@@ -0,0 +1,1434 @@
+{
+  "source": "universe.ini",
+  "background": "#05080f",
+  "grid": {
+    "minCol": 0,
+    "minRow": 0,
+    "maxCol": 16,
+    "maxRow": 16,
+    "cellSize": 72,
+    "margin": 72
+  },
+  "viewBox": {
+    "x": 0,
+    "y": 0,
+    "width": 1296,
+    "height": 1296
+  },
+  "systems": [
+    {
+      "id": "li05",
+      "nickname": "Li05",
+      "name": "Alaska",
+      "file": "systems\\Li05\\Li05.ini",
+      "gridX": 9,
+      "gridY": 7,
+      "stridName": 196613,
+      "navMapScale": 1.5,
+      "visit": 0,
+      "note": "",
+      "x": 720,
+      "y": 576
+    },
+    {
+      "id": "iw01",
+      "nickname": "Iw01",
+      "name": "Bering",
+      "file": "systems\\Iw01\\Iw01.ini",
+      "gridX": 9,
+      "gridY": 9,
+      "stridName": 196643,
+      "navMapScale": 2,
+      "visit": 0,
+      "note": "",
+      "x": 720,
+      "y": 720
+    },
+    {
+      "id": "li02",
+      "nickname": "Li02",
+      "name": "California",
+      "file": "systems\\Li02\\Li02.ini",
+      "gridX": 6,
+      "gridY": 9,
+      "stridName": 196610,
+      "navMapScale": 1,
+      "visit": 0,
+      "note": "",
+      "x": 504,
+      "y": 720
+    },
+    {
+      "id": "br02",
+      "nickname": "Br02",
+      "name": "Cambridge",
+      "file": "systems\\Br02\\Br02.ini",
+      "gridX": 4,
+      "gridY": 10,
+      "stridName": 196615,
+      "navMapScale": 1,
+      "visit": 0,
+      "note": "",
+      "x": 360,
+      "y": 792
+    },
+    {
+      "id": "ku06",
+      "nickname": "Ku06",
+      "name": "Chugoku",
+      "file": "systems\\Ku06\\Ku06.ini",
+      "gridX": 7,
+      "gridY": 2,
+      "stridName": 196631,
+      "navMapScale": 2,
+      "visit": 0,
+      "note": "",
+      "x": 576,
+      "y": 216
+    },
+    {
+      "id": "li03",
+      "nickname": "Li03",
+      "name": "Colorado",
+      "file": "systems\\Li03\\Li03.ini",
+      "gridX": 7,
+      "gridY": 7,
+      "stridName": 196611,
+      "navMapScale": 1,
+      "visit": 0,
+      "note": "",
+      "x": 576,
+      "y": 576
+    },
+    {
+      "id": "iw04",
+      "nickname": "Iw04",
+      "name": "Cortez",
+      "file": "systems\\Iw04\\Iw04.ini",
+      "gridX": 5,
+      "gridY": 9,
+      "stridName": 196646,
+      "navMapScale": 2,
+      "visit": 0,
+      "note": "",
+      "x": 432,
+      "y": 720
+    },
+    {
+      "id": "rh05",
+      "nickname": "Rh05",
+      "name": "Dresden",
+      "file": "systems\\Rh05\\Rh05.ini",
+      "gridX": 11,
+      "gridY": 12,
+      "stridName": 196624,
+      "navMapScale": 2,
+      "visit": 0,
+      "note": "",
+      "x": 864,
+      "y": 936
+    },
+    {
+      "id": "br06",
+      "nickname": "Br06",
+      "name": "Dublin",
+      "file": "systems\\Br06\\Br06.ini",
+      "gridX": 0,
+      "gridY": 10,
+      "stridName": 196619,
+      "navMapScale": 2,
+      "visit": 0,
+      "note": "",
+      "x": 72,
+      "y": 792
+    },
+    {
+      "id": "br05",
+      "nickname": "Br05",
+      "name": "Edinburgh",
+      "file": "systems\\Br05\\Br05.ini",
+      "gridX": 1,
+      "gridY": 13,
+      "stridName": 196618,
+      "navMapScale": 2,
+      "visit": 0,
+      "note": "",
+      "x": 144,
+      "y": 1008
+    },
+    {
+      "id": "rh02",
+      "nickname": "Rh02",
+      "name": "Frankfurt",
+      "file": "systems\\Rh02\\Rh02.ini",
+      "gridX": 10,
+      "gridY": 10,
+      "stridName": 196621,
+      "navMapScale": 1,
+      "visit": 0,
+      "note": "",
+      "x": 792,
+      "y": 792
+    },
+    {
+      "id": "iw06",
+      "nickname": "Iw06",
+      "name": "Galileo",
+      "file": "systems\\Iw06\\Iw06.ini",
+      "gridX": 8,
+      "gridY": 6,
+      "stridName": 196648,
+      "navMapScale": 2,
+      "visit": 0,
+      "note": "",
+      "x": 648,
+      "y": 504
+    },
+    {
+      "id": "rh04",
+      "nickname": "Rh04",
+      "name": "Hamburg",
+      "file": "systems\\Rh04\\Rh04.ini",
+      "gridX": 12,
+      "gridY": 10,
+      "stridName": 196623,
+      "navMapScale": 1,
+      "visit": 0,
+      "note": "",
+      "x": 936,
+      "y": 792
+    },
+    {
+      "id": "ku05",
+      "nickname": "Ku05",
+      "name": "Hokkaido",
+      "file": "systems\\Ku05\\Ku05.ini",
+      "gridX": 7,
+      "gridY": 3,
+      "stridName": 196630,
+      "navMapScale": 2,
+      "visit": 0,
+      "note": "",
+      "x": 576,
+      "y": 288
+    },
+    {
+      "id": "ku04",
+      "nickname": "Ku04",
+      "name": "Honshu",
+      "file": "systems\\Ku04\\Ku04.ini",
+      "gridX": 8,
+      "gridY": 4,
+      "stridName": 196629,
+      "navMapScale": 1,
+      "visit": 0,
+      "note": "",
+      "x": 648,
+      "y": 360
+    },
+    {
+      "id": "iw02",
+      "nickname": "Iw02",
+      "name": "Hudson",
+      "file": "systems\\Iw02\\Iw02.ini",
+      "gridX": 9,
+      "gridY": 10,
+      "stridName": 196644,
+      "navMapScale": 2,
+      "visit": 0,
+      "note": "",
+      "x": 720,
+      "y": 792
+    },
+    {
+      "id": "iw05",
+      "nickname": "Iw05",
+      "name": "Kepler",
+      "file": "systems\\Iw05\\Iw05.ini",
+      "gridX": 6,
+      "gridY": 6,
+      "stridName": 196647,
+      "navMapScale": 2,
+      "visit": 0,
+      "note": "",
+      "x": 504,
+      "y": 504
+    },
+    {
+      "id": "ku03",
+      "nickname": "Ku03",
+      "name": "Kyushu",
+      "file": "systems\\Ku03\\Ku03.ini",
+      "gridX": 6,
+      "gridY": 4,
+      "stridName": 196628,
+      "navMapScale": 1,
+      "visit": 0,
+      "note": "",
+      "x": 504,
+      "y": 360
+    },
+    {
+      "id": "br04",
+      "nickname": "Br04",
+      "name": "Leeds",
+      "file": "systems\\Br04\\Br04.ini",
+      "gridX": 2,
+      "gridY": 9,
+      "stridName": 196617,
+      "navMapScale": 1,
+      "visit": 0,
+      "note": "",
+      "x": 216,
+      "y": 720
+    },
+    {
+      "id": "iw03",
+      "nickname": "Iw03",
+      "name": "Magellan",
+      "file": "systems\\Iw03\\Iw03.ini",
+      "gridX": 5,
+      "gridY": 10,
+      "stridName": 196645,
+      "navMapScale": 2,
+      "visit": 0,
+      "note": "",
+      "x": 432,
+      "y": 792
+    },
+    {
+      "id": "br03",
+      "nickname": "Br03",
+      "name": "Manchester",
+      "file": "systems\\Br03\\Br03.ini",
+      "gridX": 3,
+      "gridY": 12,
+      "stridName": 196616,
+      "navMapScale": 1,
+      "visit": 0,
+      "note": "",
+      "x": 288,
+      "y": 936
+    },
+    {
+      "id": "rh01",
+      "nickname": "Rh01",
+      "name": "New Berlin",
+      "file": "systems\\Rh01\\Rh01.ini",
+      "gridX": 11,
+      "gridY": 11,
+      "stridName": 196620,
+      "navMapScale": 1,
+      "visit": 0,
+      "note": "",
+      "x": 864,
+      "y": 864
+    },
+    {
+      "id": "br01",
+      "nickname": "Br01",
+      "name": "New London",
+      "file": "systems\\Br01\\Br01.ini",
+      "gridX": 2,
+      "gridY": 11,
+      "stridName": 196614,
+      "navMapScale": 1,
+      "visit": 0,
+      "note": "",
+      "x": 216,
+      "y": 864
+    },
+    {
+      "id": "li06",
+      "nickname": "LI06",
+      "name": "New Nevada",
+      "file": "systems\\LI06\\LI06.ini",
+      "gridX": 6,
+      "gridY": 8,
+      "stridName": 450000,
+      "navMapScale": 1.82,
+      "visit": 1,
+      "note": "",
+      "x": 504,
+      "y": 648
+    },
+    {
+      "id": "ku01",
+      "nickname": "Ku01",
+      "name": "New Tokyo",
+      "file": "systems\\Ku01\\Ku01.ini",
+      "gridX": 7,
+      "gridY": 4,
+      "stridName": 196626,
+      "navMapScale": 1,
+      "visit": 0,
+      "note": "",
+      "x": 576,
+      "y": 360
+    },
+    {
+      "id": "li01",
+      "nickname": "Li01",
+      "name": "New York",
+      "file": "Systems\\Li01\\Li01.ini",
+      "gridX": 7,
+      "gridY": 8,
+      "stridName": 196609,
+      "navMapScale": 1,
+      "visit": 1,
+      "note": "",
+      "x": 576,
+      "y": 648
+    },
+    {
+      "id": "bw04",
+      "nickname": "Bw04",
+      "name": "Omega-11",
+      "file": "systems\\Bw04\\Bw04.ini",
+      "gridX": 8,
+      "gridY": 13,
+      "stridName": 196636,
+      "navMapScale": 2.5,
+      "visit": 0,
+      "note": "",
+      "x": 648,
+      "y": 1008
+    },
+    {
+      "id": "bw01",
+      "nickname": "Bw01",
+      "name": "Omega-3",
+      "file": "systems\\Bw01\\Bw01.ini",
+      "gridX": 5,
+      "gridY": 12,
+      "stridName": 196633,
+      "navMapScale": 2,
+      "visit": 0,
+      "note": "",
+      "x": 432,
+      "y": 936
+    },
+    {
+      "id": "bw05",
+      "nickname": "Bw05",
+      "name": "Omega-41",
+      "file": "systems\\Bw05\\Bw05.ini",
+      "gridX": 11,
+      "gridY": 6,
+      "stridName": 196637,
+      "navMapScale": 2,
+      "visit": 0,
+      "note": "",
+      "x": 864,
+      "y": 504
+    },
+    {
+      "id": "bw02",
+      "nickname": "Bw02",
+      "name": "Omega-5",
+      "file": "systems\\Bw02\\Bw02.ini",
+      "gridX": 5,
+      "gridY": 14,
+      "stridName": 196634,
+      "navMapScale": 2,
+      "visit": 0,
+      "note": "",
+      "x": 432,
+      "y": 1080
+    },
+    {
+      "id": "bw03",
+      "nickname": "Bw03",
+      "name": "Omega-7",
+      "file": "systems\\Bw03\\Bw03.ini",
+      "gridX": 7,
+      "gridY": 12,
+      "stridName": 196635,
+      "navMapScale": 3,
+      "visit": 0,
+      "note": "",
+      "x": 576,
+      "y": 936
+    },
+    {
+      "id": "ew02",
+      "nickname": "Ew02",
+      "name": "Omicron Alpha",
+      "file": "systems\\Ew02\\Ew02.ini",
+      "gridX": 10,
+      "gridY": 1,
+      "stridName": 196650,
+      "navMapScale": 4,
+      "visit": 0,
+      "note": "",
+      "x": 792,
+      "y": 144
+    },
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+      "to": "ku05",
+      "type": "neutral"
+    },
+    {
+      "id": "c-ku04-ku06",
+      "from": "ku04",
+      "to": "ku06",
+      "type": "neutral"
+    },
+    {
+      "id": "c-ku05-ku06",
+      "from": "ku05",
+      "to": "ku06",
+      "type": "neutral"
+    },
+    {
+      "id": "c-ku05-ku07",
+      "from": "ku05",
+      "to": "ku07",
+      "type": "neutral"
+    },
+    {
+      "id": "c-ku06-ku07",
+      "from": "ku06",
+      "to": "ku07",
+      "type": "neutral"
+    },
+    {
+      "id": "c-li01-li02",
+      "from": "li01",
+      "to": "li02",
+      "type": "standard"
+    },
+    {
+      "id": "c-li01-li03",
+      "from": "li01",
+      "to": "li03",
+      "type": "standard"
+    },
+    {
+      "id": "c-li01-li04",
+      "from": "li01",
+      "to": "li04",
+      "type": "standard"
+    },
+    {
+      "id": "c-li01-li05",
+      "from": "li01",
+      "to": "li05",
+      "type": "standard"
+    },
+    {
+      "id": "c-li01-li06",
+      "from": "li01",
+      "to": "li06",
+      "type": "neutral"
+    },
+    {
+      "id": "c-li02-li04",
+      "from": "li02",
+      "to": "li04",
+      "type": "neutral"
+    },
+    {
+      "id": "c-li02-li06",
+      "from": "li02",
+      "to": "li06",
+      "type": "standard"
+    },
+    {
+      "id": "c-li06-li07",
+      "from": "li06",
+      "to": "li07",
+      "type": "neutral"
+    },
+    {
+      "id": "c-rh01-rh02",
+      "from": "rh01",
+      "to": "rh02",
+      "type": "standard"
+    },
+    {
+      "id": "c-rh01-rh03",
+      "from": "rh01",
+      "to": "rh03",
+      "type": "standard"
+    },
+    {
+      "id": "c-rh01-rh04",
+      "from": "rh01",
+      "to": "rh04",
+      "type": "standard"
+    },
+    {
+      "id": "c-rh01-rh05",
+      "from": "rh01",
+      "to": "rh05",
+      "type": "standard"
+    },
+    {
+      "id": "c-rh02-rh04",
+      "from": "rh02",
+      "to": "rh04",
+      "type": "neutral"
+    },
+    {
+      "id": "c-rh03-rh05",
+      "from": "rh03",
+      "to": "rh05",
+      "type": "neutral"
+    },
+    {
+      "id": "c-rh04-rh05",
+      "from": "rh04",
+      "to": "rh05",
+      "type": "neutral"
+    },
+    {
+      "id": "c-st01-st02",
+      "from": "st01",
+      "to": "st02",
+      "type": "neutral"
+    },
+    {
+      "id": "c-st01-st03",
+      "from": "st01",
+      "to": "st03",
+      "type": "standard"
+    },
+    {
+      "id": "c-st02-st02c",
+      "from": "st02",
+      "to": "st02c",
+      "type": "standard"
+    },
+    {
+      "id": "c-st03-st03b",
+      "from": "st03",
+      "to": "st03b",
+      "type": "standard"
+    }
+  ]
+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..211ee1b
--- /dev/null
+++ b/package.json
@@ -0,0 +1,14 @@
+{
+  "name": "editable-star-map",
+  "version": "1.0.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "import:universe": "node build-universe-map.mjs",
+    "start": "node server.mjs",
+    "test": "node --test star-map.test.mjs server.test.mjs"
+  },
+  "engines": {
+    "node": ">=20"
+  }
+}
diff --git a/server.mjs b/server.mjs
new file mode 100644
index 0000000..7ebbb53
--- /dev/null
+++ b/server.mjs
@@ -0,0 +1,145 @@
+import { createServer as createHttpServer } from "node:http";
+import { mkdir, readFile, rename, writeFile } from "node:fs/promises";
+import { existsSync } from "node:fs";
+import { dirname, join } from "node:path";
+import { fileURLToPath, pathToFileURL } from "node:url";
+
+const projectDir = dirname(fileURLToPath(import.meta.url));
+
+function sendJson(response, statusCode, value) {
+  response.writeHead(statusCode, {
+    "content-type": "application/json; charset=utf-8",
+    "cache-control": "no-store"
+  });
+  response.end(JSON.stringify(value));
+}
+
+function sendText(response, statusCode, text, contentType = "text/plain; charset=utf-8") {
+  response.writeHead(statusCode, {
+    "content-type": contentType,
+    "cache-control": "no-store"
+  });
+  response.end(text);
+}
+
+async function readRequestBody(request, limitBytes = 5 * 1024 * 1024) {
+  const chunks = [];
+  let size = 0;
+
+  for await (const chunk of request) {
+    size += chunk.length;
+    if (size > limitBytes) {
+      throw new Error("Payload zu gross");
+    }
+    chunks.push(chunk);
+  }
+
+  return Buffer.concat(chunks).toString("utf8");
+}
+
+function validateMapData(value) {
+  if (!value || typeof value !== "object") {
+    throw new Error("Karte muss ein Objekt sein");
+  }
+  if (!Array.isArray(value.systems) || !Array.isArray(value.connections)) {
+    throw new Error("systems und connections muessen Arrays sein");
+  }
+
+  const ids = new Set();
+  for (const system of value.systems) {
+    if (!system || typeof system !== "object") {
+      throw new Error("Ungueltiges System");
+    }
+    if (typeof system.id !== "string" || typeof system.name !== "string") {
+      throw new Error("System braucht id und name");
+    }
+    if (!Number.isFinite(system.x) || !Number.isFinite(system.y)) {
+      throw new Error("System braucht x/y Koordinaten");
+    }
+    ids.add(system.id);
+  }
+
+  for (const connection of value.connections) {
+    if (!connection || typeof connection !== "object") {
+      throw new Error("Ungueltige Verbindung");
+    }
+    if (typeof connection.id !== "string" || typeof connection.from !== "string" || typeof connection.to !== "string") {
+      throw new Error("Verbindung braucht id/from/to");
+    }
+    if (!ids.has(connection.from) || !ids.has(connection.to)) {
+      throw new Error("Verbindung verweist auf unbekanntes System");
+    }
+  }
+
+  return {
+    source: typeof value.source === "string" ? value.source : undefined,
+    background: typeof value.background === "string" ? value.background : "#05080f",
+    grid: value.grid && typeof value.grid === "object" ? value.grid : undefined,
+    viewBox: value.viewBox && typeof value.viewBox === "object" ? value.viewBox : undefined,
+    systems: value.systems,
+    connections: value.connections
+  };
+}
+
+async function readInitialMap(htmlPath) {
+  const html = await readFile(htmlPath, "utf8");
+  const match = html.match(/<script type="application\/json" id="initial-map-data">([\s\S]*?)<\/script>/);
+  if (!match) {
+    throw new Error("initial-map-data nicht gefunden");
+  }
+  return validateMapData(JSON.parse(match[1]));
+}
+
+export function createMapServer(options = {}) {
+  const htmlPath = options.htmlPath || join(projectDir, "star-map.html");
+  const dataDir = options.dataDir || process.env.DATA_DIR || join(projectDir, "data");
+  const dataPath = join(dataDir, "map.json");
+
+  return createHttpServer(async (request, response) => {
+    try {
+      const url = new URL(request.url, "http://localhost");
+
+      if (request.method === "GET" && (url.pathname === "/" || url.pathname === "/star-map.html")) {
+        const html = await readFile(htmlPath, "utf8");
+        sendText(response, 200, html, "text/html; charset=utf-8");
+        return;
+      }
+
+      if (url.pathname === "/api/map" && request.method === "GET") {
+        if (existsSync(dataPath)) {
+          sendJson(response, 200, validateMapData(JSON.parse(await readFile(dataPath, "utf8"))));
+          return;
+        }
+        sendJson(response, 200, await readInitialMap(htmlPath));
+        return;
+      }
+
+      if (url.pathname === "/api/map" && request.method === "PUT") {
+        const body = await readRequestBody(request);
+        const mapData = validateMapData(JSON.parse(body));
+        await mkdir(dataDir, { recursive: true });
+        const tempPath = `${dataPath}.tmp`;
+        await writeFile(tempPath, `${JSON.stringify(mapData, null, 2)}\n`, "utf8");
+        await rename(tempPath, dataPath);
+        sendJson(response, 200, { ok: true });
+        return;
+      }
+
+      sendJson(response, 404, { error: "Nicht gefunden" });
+    } catch (error) {
+      const status = error instanceof SyntaxError || /ungueltig|braucht|muss|verweist|Payload|systems/i.test(error.message)
+        ? 400
+        : 500;
+      sendJson(response, status, { error: error.message });
+    }
+  });
+}
+
+if (import.meta.url === pathToFileURL(process.argv[1]).href) {
+  const port = Number(process.env.PORT || 3000);
+  const host = process.env.HOST || "127.0.0.1";
+  const server = createMapServer();
+  server.listen(port, host, () => {
+    console.log(`Star Map Editor: http://${host}:${port}`);
+  });
+}
diff --git a/server.test.mjs b/server.test.mjs
new file mode 100644
index 0000000..300d1a9
--- /dev/null
+++ b/server.test.mjs
@@ -0,0 +1,60 @@
+import assert from "node:assert/strict";
+import { mkdtemp, rm } from "node:fs/promises";
+import { tmpdir } from "node:os";
+import { join } from "node:path";
+import test from "node:test";
+import { createMapServer } from "./server.mjs";
+
+test("server stores and returns the editable map JSON", async () => {
+  const dataDir = await mkdtemp(join(tmpdir(), "star-map-"));
+  const server = createMapServer({ dataDir });
+
+  await new Promise((resolve) => server.listen(0, "127.0.0.1", resolve));
+  const { port } = server.address();
+  const baseUrl = `http://127.0.0.1:${port}`;
+
+  try {
+    const payload = {
+      background: "#101010",
+      systems: [{ id: "alpha", name: "Alpha", x: 10, y: 20, note: "saved" }],
+      connections: []
+    };
+
+    const saveResponse = await fetch(`${baseUrl}/api/map`, {
+      method: "PUT",
+      headers: { "content-type": "application/json" },
+      body: JSON.stringify(payload)
+    });
+
+    assert.equal(saveResponse.status, 200);
+    assert.deepEqual(await saveResponse.json(), { ok: true });
+
+    const loadResponse = await fetch(`${baseUrl}/api/map`);
+    assert.equal(loadResponse.status, 200);
+    assert.deepEqual(await loadResponse.json(), payload);
+  } finally {
+    await new Promise((resolve) => server.close(resolve));
+    await rm(dataDir, { recursive: true, force: true });
+  }
+});
+
+test("server rejects invalid map payloads", async () => {
+  const dataDir = await mkdtemp(join(tmpdir(), "star-map-"));
+  const server = createMapServer({ dataDir });
+
+  await new Promise((resolve) => server.listen(0, "127.0.0.1", resolve));
+  const { port } = server.address();
+
+  try {
+    const response = await fetch(`http://127.0.0.1:${port}/api/map`, {
+      method: "PUT",
+      headers: { "content-type": "application/json" },
+      body: JSON.stringify({ systems: "bad", connections: [] })
+    });
+
+    assert.equal(response.status, 400);
+  } finally {
+    await new Promise((resolve) => server.close(resolve));
+    await rm(dataDir, { recursive: true, force: true });
+  }
+});
diff --git a/star-map.html b/star-map.html
new file mode 100644
index 0000000..3ce92b6
--- /dev/null
+++ b/star-map.html
@@ -0,0 +1,2620 @@
+<!doctype html>
+<html lang="de">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1">
+  <title>Editable Star Map</title>
+  <style>
+    :root {
+      --panel: #111827;
+      --panel-2: #0b1220;
+      --line: #d6b21e;
+      --line-alt: #3487d9;
+      --line-muted: #7f8fa6;
+      --text: #eef6ff;
+      --muted: #9ba9bd;
+      --accent: #69b7ff;
+      --danger: #ef4444;
+      --ok: #30c48d;
+      --border: rgba(255, 255, 255, 0.16);
+      font-family: Inter, Segoe UI, Roboto, Arial, sans-serif;
+    }
+
+    * {
+      box-sizing: border-box;
+    }
+
+    body {
+      margin: 0;
+      min-height: 100vh;
+      background: #05080f;
+      color: var(--text);
+      overflow: hidden;
+    }
+
+    button,
+    input,
+    textarea,
+    select {
+      font: inherit;
+    }
+
+    .app {
+      display: grid;
+      grid-template-columns: minmax(0, 1fr) 320px;
+      grid-template-rows: auto minmax(0, 1fr);
+      height: 100vh;
+    }
+
+    .toolbar {
+      grid-column: 1 / -1;
+      display: flex;
+      align-items: center;
+      gap: 10px;
+      padding: 10px 12px;
+      background: linear-gradient(180deg, #121a2a, #0d1422);
+      border-bottom: 1px solid var(--border);
+      min-width: 0;
+    }
+
+    .brand {
+      font-weight: 800;
+      margin-right: 8px;
+      white-space: nowrap;
+    }
+
+    .tool-group {
+      display: flex;
+      align-items: center;
+      gap: 6px;
+      padding-right: 10px;
+      border-right: 1px solid var(--border);
+      min-width: 0;
+    }
+
+    .tool-button,
+    .action-button {
+      border: 1px solid var(--border);
+      color: var(--text);
+      background: #172033;
+      padding: 8px 10px;
+      border-radius: 6px;
+      cursor: pointer;
+      min-height: 36px;
+      white-space: nowrap;
+    }
+
+    .tool-button:hover,
+    .action-button:hover {
+      border-color: rgba(105, 183, 255, 0.65);
+    }
+
+    .tool-button.is-active {
+      background: #1d4f7a;
+      border-color: #72c6ff;
+      box-shadow: 0 0 0 2px rgba(105, 183, 255, 0.18) inset;
+    }
+
+    .danger {
+      background: #35151c;
+      color: #ffe8ec;
+      border-color: rgba(239, 68, 68, 0.45);
+    }
+
+    .background-label {
+      display: flex;
+      align-items: center;
+      gap: 7px;
+      color: var(--muted);
+      white-space: nowrap;
+    }
+
+    input[type="color"] {
+      width: 36px;
+      height: 34px;
+      padding: 2px;
+      border: 1px solid var(--border);
+      border-radius: 6px;
+      background: #172033;
+    }
+
+    .map-wrap {
+      position: relative;
+      min-width: 0;
+      min-height: 0;
+      background: #05080f;
+      overflow: hidden;
+    }
+
+    .map-wrap::before {
+      content: "";
+      position: absolute;
+      inset: 0;
+      background:
+        radial-gradient(circle at 19% 42%, rgba(38, 126, 255, 0.26), transparent 23%),
+        radial-gradient(circle at 52% 76%, rgba(241, 147, 28, 0.2), transparent 22%),
+        radial-gradient(circle at 88% 27%, rgba(23, 190, 165, 0.22), transparent 24%),
+        radial-gradient(circle at 7% 82%, rgba(151, 46, 122, 0.16), transparent 19%);
+      pointer-events: none;
+    }
+
+    .map {
+      position: relative;
+      width: 100%;
+      height: 100%;
+      display: block;
+      touch-action: none;
+      background-color: var(--map-bg, #05080f);
+    }
+
+    .sector-border {
+      fill: none;
+      stroke: rgba(145, 170, 204, 0.42);
+      stroke-width: 2;
+      stroke-dasharray: 8 4;
+      pointer-events: none;
+    }
+
+    .grid-line {
+      stroke: rgba(145, 170, 204, 0.16);
+      stroke-width: 1;
+      pointer-events: none;
+    }
+
+    .grid-label {
+      fill: rgba(220, 235, 255, 0.45);
+      font-size: 12px;
+      font-weight: 700;
+      text-anchor: middle;
+      pointer-events: none;
+      user-select: none;
+    }
+
+    .connection {
+      stroke: var(--line);
+      stroke-width: 1.5;
+      opacity: 0.7;
+      cursor: pointer;
+    }
+
+    .connection.trade {
+      stroke: var(--line-alt);
+      opacity: 0.85;
+    }
+
+    .connection.neutral {
+      stroke: var(--line-muted);
+      opacity: 0.75;
+    }
+
+    .connection-hit {
+      stroke: transparent;
+      stroke-width: 14;
+      cursor: pointer;
+    }
+
+    .connection.is-selected {
+      stroke: #ffffff;
+      stroke-width: 3;
+      opacity: 1;
+    }
+
+    .system {
+      cursor: grab;
+    }
+
+    .system:active {
+      cursor: grabbing;
+    }
+
+    .system-hit {
+      fill: transparent;
+      stroke: transparent;
+      pointer-events: all;
+    }
+
+    .system-core {
+      fill: #d9f0ff;
+      stroke: #81c8ff;
+      stroke-width: 2;
+      filter: drop-shadow(0 0 7px #62b9ff) drop-shadow(0 0 16px rgba(100, 179, 255, 0.8));
+    }
+
+    .system.is-selected .system-core {
+      stroke: #ffffff;
+      stroke-width: 4;
+      filter: drop-shadow(0 0 9px #ffffff) drop-shadow(0 0 20px #55baff);
+    }
+
+    .system.is-pending .system-core {
+      stroke: #ffd65a;
+      stroke-width: 4;
+    }
+
+    .system-label {
+      fill: #ffffff;
+      stroke: rgba(0, 0, 0, 0.88);
+      stroke-width: 4;
+      paint-order: stroke;
+      font-size: 19px;
+      font-weight: 800;
+      text-anchor: middle;
+      pointer-events: none;
+      user-select: none;
+    }
+
+    .sidebar {
+      display: flex;
+      flex-direction: column;
+      gap: 14px;
+      min-width: 0;
+      min-height: 0;
+      padding: 14px;
+      background: var(--panel);
+      border-left: 1px solid var(--border);
+      overflow: auto;
+    }
+
+    .section {
+      border: 1px solid var(--border);
+      border-radius: 8px;
+      background: var(--panel-2);
+      padding: 12px;
+    }
+
+    .section h2 {
+      margin: 0 0 10px;
+      font-size: 16px;
+    }
+
+    .field {
+      display: grid;
+      gap: 6px;
+      margin-top: 10px;
+    }
+
+    .field label {
+      color: var(--muted);
+      font-size: 13px;
+    }
+
+    .text-input,
+    textarea,
+    select {
+      width: 100%;
+      border: 1px solid var(--border);
+      border-radius: 6px;
+      background: #09101d;
+      color: var(--text);
+      padding: 9px 10px;
+      outline: none;
+    }
+
+    textarea {
+      min-height: 140px;
+      resize: vertical;
+      line-height: 1.4;
+    }
+
+    .hint,
+    .selection-meta {
+      color: var(--muted);
+      font-size: 13px;
+      line-height: 1.45;
+    }
+
+    .selection-meta {
+      margin: 0;
+    }
+
+    .hidden {
+      display: none;
+    }
+
+    .action-row {
+      display: flex;
+      gap: 8px;
+      flex-wrap: wrap;
+      margin-top: 12px;
+    }
+
+    .status {
+      margin-left: auto;
+      color: var(--muted);
+      font-size: 13px;
+      min-width: 160px;
+      text-align: right;
+      overflow: hidden;
+      text-overflow: ellipsis;
+      white-space: nowrap;
+    }
+
+    .mobile-note {
+      display: none;
+    }
+
+    @media (max-width: 880px) {
+      body {
+        overflow: auto;
+      }
+
+      .app {
+        grid-template-columns: 1fr;
+        grid-template-rows: auto 68vh auto;
+        min-height: 100vh;
+        height: auto;
+      }
+
+      .toolbar {
+        flex-wrap: wrap;
+      }
+
+      .sidebar {
+        border-left: 0;
+        border-top: 1px solid var(--border);
+      }
+
+      .status {
+        text-align: left;
+        margin-left: 0;
+        flex-basis: 100%;
+      }
+
+      .mobile-note {
+        display: block;
+      }
+    }
+  </style>
+</head>
+<body>
+  <div class="app">
+    <header class="toolbar">
+      <div class="brand">Star Map Editor</div>
+      <div class="tool-group" role="group" aria-label="Werkzeuge">
+        <button class="tool-button is-active" data-mode="select" type="button" title="Auswaehlen und verschieben">Auswahl</button>
+        <button class="tool-button" data-mode="add" type="button" title="In die Karte klicken, um ein System anzulegen">Punkt</button>
+        <button class="tool-button" data-mode="connect" type="button" title="Zwei Systeme anklicken, um sie zu verbinden">Verbindung</button>
+      </div>
+      <div class="tool-group">
+        <button class="action-button danger" id="deleteSelected" type="button">Loeschen</button>
+        <button class="action-button" id="resetMap" type="button">Vorlage laden</button>
+      </div>
+      <div class="tool-group">
+        <label class="background-label" for="backgroundColor">Hintergrund <input id="backgroundColor" type="color" value="#05080f"></label>
+        <span class="background-label">Raster aktiv</span>
+      </div>
+      <div class="status" id="status">Bereit</div>
+    </header>
+
+    <main class="map-wrap" id="mapWrap">
+      <svg class="map" id="map" viewBox="0 0 1296 1296" aria-label="Editierbare Sternenkarte">
+        <defs>
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+        <g id="connections"></g>
+        <g id="systems"></g>
+      </svg>
+    </main>
+
+    <aside class="sidebar">
+      <section class="section">
+        <h2>Auswahl</h2>
+        <p class="selection-meta" id="selectionMeta">Kein Objekt ausgewaehlt.</p>
+        <div id="systemEditor" class="hidden">
+          <div class="field">
+            <label for="systemName">Systemname</label>
+            <input class="text-input" id="systemName" type="text" autocomplete="off">
+          </div>
+          <div class="field">
+            <label for="systemNote">Notiz</label>
+            <textarea id="systemNote" placeholder="Notiz fuer dieses System"></textarea>
+          </div>
+        </div>
+        <div id="connectionEditor" class="hidden">
+          <div class="field">
+            <label for="connectionType">Linientyp</label>
+            <select id="connectionType">
+              <option value="standard">Gold</option>
+              <option value="trade">Blau</option>
+              <option value="neutral">Grau</option>
+            </select>
+          </div>
+        </div>
+        <div class="action-row">
+          <button class="action-button" id="centerSelection" type="button">Zentrieren</button>
+        </div>
+      </section>
+
+      <section class="section">
+        <h2>Bearbeitung</h2>
+        <p class="hint">Auswahl: System anklicken, Name/Notiz bearbeiten oder Punkt ziehen. Punkt: freie Stelle anklicken. Verbindung: zwei Systeme nacheinander anklicken. Neue und verschobene Systeme rasten immer auf die naechste Rasterzelle ein.</p>
+        <p class="hint mobile-note">Auf Touchscreens klappt Verschieben am besten im Auswahlmodus mit kurzem Halten und Ziehen.</p>
+      </section>
+
+      <section class="section">
+        <h2>Daten</h2>
+        <div class="action-row">
+          <button class="action-button" id="saveRemote" type="button">Speichern</button>
+          <button class="action-button" id="loadRemote" type="button">Laden</button>
+          <button class="action-button" id="exportJson" type="button">Export</button>
+          <button class="action-button" id="importJson" type="button">Import</button>
+        </div>
+        <div class="field">
+          <label for="dataBox">JSON</label>
+          <textarea id="dataBox" placeholder="Exportierte Karte oder JSON zum Importieren"></textarea>
+        </div>
+      </section>
+    </aside>
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+      "to": "hi02",
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+      "type": "standard"
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+      "type": "standard"
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+      "from": "iw04",
+      "to": "li06",
+      "type": "neutral"
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+      "to": "iw06",
+      "type": "neutral"
+    },
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+      "to": "ku02",
+      "type": "standard"
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+      "to": "li03",
+      "type": "standard"
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+      "type": "standard"
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+      "type": "standard"
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+    {
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+    },
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+      "to": "ku05",
+      "type": "standard"
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+      "to": "ku03",
+      "type": "neutral"
+    },
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+      "to": "ku05",
+      "type": "neutral"
+    },
+    {
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+      "from": "ku04",
+      "to": "ku06",
+      "type": "neutral"
+    },
+    {
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+      "to": "ku06",
+      "type": "neutral"
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+      "to": "ku07",
+      "type": "neutral"
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+      "type": "neutral"
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+      "to": "li02",
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+      "type": "standard"
+    },
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+      "type": "standard"
+    },
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+      "to": "li05",
+      "type": "standard"
+    },
+    {
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+      "from": "li01",
+      "to": "li06",
+      "type": "neutral"
+    },
+    {
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+      "from": "li02",
+      "to": "li04",
+      "type": "neutral"
+    },
+    {
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+      "from": "li02",
+      "to": "li06",
+      "type": "standard"
+    },
+    {
+      "id": "c-li06-li07",
+      "from": "li06",
+      "to": "li07",
+      "type": "neutral"
+    },
+    {
+      "id": "c-rh01-rh02",
+      "from": "rh01",
+      "to": "rh02",
+      "type": "standard"
+    },
+    {
+      "id": "c-rh01-rh03",
+      "from": "rh01",
+      "to": "rh03",
+      "type": "standard"
+    },
+    {
+      "id": "c-rh01-rh04",
+      "from": "rh01",
+      "to": "rh04",
+      "type": "standard"
+    },
+    {
+      "id": "c-rh01-rh05",
+      "from": "rh01",
+      "to": "rh05",
+      "type": "standard"
+    },
+    {
+      "id": "c-rh02-rh04",
+      "from": "rh02",
+      "to": "rh04",
+      "type": "neutral"
+    },
+    {
+      "id": "c-rh03-rh05",
+      "from": "rh03",
+      "to": "rh05",
+      "type": "neutral"
+    },
+    {
+      "id": "c-rh04-rh05",
+      "from": "rh04",
+      "to": "rh05",
+      "type": "neutral"
+    },
+    {
+      "id": "c-st01-st02",
+      "from": "st01",
+      "to": "st02",
+      "type": "neutral"
+    },
+    {
+      "id": "c-st01-st03",
+      "from": "st01",
+      "to": "st03",
+      "type": "standard"
+    },
+    {
+      "id": "c-st02-st02c",
+      "from": "st02",
+      "to": "st02c",
+      "type": "standard"
+    },
+    {
+      "id": "c-st03-st03b",
+      "from": "st03",
+      "to": "st03b",
+      "type": "standard"
+    }
+  ]
+}
+  </script>
+
+  <script>
+    const svg = document.getElementById("map");
+    const gridLayer = document.getElementById("gridLayer");
+    const sectorBorder = document.querySelector(".sector-border");
+    const systemLayer = document.getElementById("systems");
+    const connectionLayer = document.getElementById("connections");
+    const connectionHitLayer = document.getElementById("connectionHits");
+    const toolButtons = Array.from(document.querySelectorAll(".tool-button"));
+    const statusEl = document.getElementById("status");
+    const selectionMeta = document.getElementById("selectionMeta");
+    const systemEditor = document.getElementById("systemEditor");
+    const connectionEditor = document.getElementById("connectionEditor");
+    const systemName = document.getElementById("systemName");
+    const systemNote = document.getElementById("systemNote");
+    const connectionType = document.getElementById("connectionType");
+    const deleteSelected = document.getElementById("deleteSelected");
+    const backgroundColor = document.getElementById("backgroundColor");
+    const exportJson = document.getElementById("exportJson");
+    const importJson = document.getElementById("importJson");
+    const saveRemote = document.getElementById("saveRemote");
+    const loadRemote = document.getElementById("loadRemote");
+    const dataBox = document.getElementById("dataBox");
+    const resetMap = document.getElementById("resetMap");
+    const centerSelection = document.getElementById("centerSelection");
+    const storageKey = "editable-star-map-v1";
+    const initialData = JSON.parse(document.getElementById("initial-map-data").textContent);
+
+    let state = loadState();
+    let mode = "select";
+    let selected = null;
+    let pendingConnectionFrom = null;
+    let drag = null;
+    let suppressClick = false;
+
+    function clone(value) {
+      return JSON.parse(JSON.stringify(value));
+    }
+
+    function loadState() {
+      try {
+        const saved = localStorage.getItem(storageKey);
+        if (saved) {
+          return JSON.parse(saved);
+        }
+      } catch (error) {
+        console.warn("Could not load saved map", error);
+      }
+      return clone(initialData);
+    }
+
+    function saveState() {
+      localStorage.setItem(storageKey, JSON.stringify(state));
+    }
+
+    function canUseServerStorage() {
+      return location.protocol === "http:" || location.protocol === "https:";
+    }
+
+    function validateMapData(next) {
+      if (!next || !Array.isArray(next.systems) || !Array.isArray(next.connections)) {
+        throw new Error("systems/connections fehlen");
+      }
+      return {
+        source: next.source,
+        background: next.background || "#05080f",
+        grid: next.grid,
+        viewBox: next.viewBox,
+        systems: next.systems,
+        connections: next.connections
+      };
+    }
+
+    function mapBounds() {
+      const viewBox = state.viewBox || {};
+      return {
+        x: Number.isFinite(viewBox.x) ? viewBox.x : 0,
+        y: Number.isFinite(viewBox.y) ? viewBox.y : 0,
+        width: Number.isFinite(viewBox.width) ? viewBox.width : 1174,
+        height: Number.isFinite(viewBox.height) ? viewBox.height : 1061
+      };
+    }
+
+    function gridToPoint(gridX, gridY) {
+      const grid = state.grid;
+      if (!grid) {
+        return { x: gridX, y: gridY };
+      }
+      return {
+        x: grid.margin + (gridX - grid.minCol) * grid.cellSize,
+        y: grid.margin + (gridY - grid.minRow) * grid.cellSize
+      };
+    }
+
+    function snapPointToGrid(point) {
+      const grid = state.grid;
+      if (!grid) {
+        return point;
+      }
+      const gridX = Math.max(grid.minCol, Math.min(grid.maxCol, Math.round((point.x - grid.margin) / grid.cellSize + grid.minCol)));
+      const gridY = Math.max(grid.minRow, Math.min(grid.maxRow, Math.round((point.y - grid.margin) / grid.cellSize + grid.minRow)));
+      return { ...gridToPoint(gridX, gridY), gridX, gridY };
+    }
+
+    function clampPoint(point) {
+      const bounds = mapBounds();
+      return {
+        ...point,
+        x: Math.max(bounds.x, Math.min(bounds.x + bounds.width, Math.round(point.x))),
+        y: Math.max(bounds.y, Math.min(bounds.y + bounds.height, Math.round(point.y)))
+      };
+    }
+
+    function findSystem(id) {
+      return state.systems.find((system) => system.id === id);
+    }
+
+    function findConnection(id) {
+      return state.connections.find((connection) => connection.id === id);
+    }
+
+    function setStatus(message) {
+      statusEl.textContent = message;
+    }
+
+    function svgPointFromEvent(event) {
+      const point = svg.createSVGPoint();
+      point.x = event.clientX;
+      point.y = event.clientY;
+      const transformed = point.matrixTransform(svg.getScreenCTM().inverse());
+      return clampPoint({ x: transformed.x, y: transformed.y });
+    }
+
+    function setMode(nextMode) {
+      mode = nextMode;
+      pendingConnectionFrom = null;
+      toolButtons.forEach((button) => {
+        button.classList.toggle("is-active", button.dataset.mode === mode);
+      });
+      if (mode === "add") {
+        setStatus("Punktmodus: freie Stelle anklicken.");
+      } else if (mode === "connect") {
+        setStatus("Verbindungsmodus: erstes System anklicken.");
+      } else {
+        setStatus("Auswahlmodus.");
+      }
+      render();
+    }
+
+    function makeSystemId(name) {
+      const base = name.toLowerCase()
+        .replace(/[^a-z0-9]+/g, "-")
+        .replace(/^-|-$/g, "") || "system";
+      let id = base;
+      let index = 2;
+      while (findSystem(id)) {
+        id = `${base}-${index}`;
+        index += 1;
+      }
+      return id;
+    }
+
+    function makeConnectionId(from, to) {
+      const base = `c-${from}-${to}`;
+      let id = base;
+      let index = 2;
+      while (findConnection(id)) {
+        id = `${base}-${index}`;
+        index += 1;
+      }
+      return id;
+    }
+
+    function createSystem(x, y) {
+      const number = state.systems.length + 1;
+      const point = snapPointToGrid({ x, y });
+      const system = {
+        id: makeSystemId(`Neues System ${number}`),
+        name: `Neues System ${number}`,
+        x: point.x,
+        y: point.y,
+        gridX: point.gridX,
+        gridY: point.gridY,
+        note: ""
+      };
+      state.systems.push(system);
+      selected = { kind: "system", id: system.id };
+      saveState();
+      render();
+      updateInspector();
+      setStatus(`${system.name} erstellt.`);
+      systemName.focus();
+      systemName.select();
+      return system;
+    }
+
+    function createConnection(from, to, type = "standard") {
+      if (from === to) {
+        setStatus("Ein System kann nicht mit sich selbst verbunden werden.");
+        return null;
+      }
+      const exists = state.connections.some((connection) => {
+        return (connection.from === from && connection.to === to) ||
+          (connection.from === to && connection.to === from);
+      });
+      if (exists) {
+        setStatus("Diese Verbindung existiert bereits.");
+        return null;
+      }
+      const connection = {
+        id: makeConnectionId(from, to),
+        from,
+        to,
+        type
+      };
+      state.connections.push(connection);
+      selected = { kind: "connection", id: connection.id };
+      pendingConnectionFrom = null;
+      saveState();
+      render();
+      updateInspector();
+      setStatus("Verbindung erstellt.");
+      return connection;
+    }
+
+    function deleteSelection() {
+      if (!selected) {
+        setStatus("Nichts ausgewaehlt.");
+        return;
+      }
+      if (selected.kind === "system") {
+        state.systems = state.systems.filter((system) => system.id !== selected.id);
+        state.connections = state.connections.filter((connection) => {
+          return connection.from !== selected.id && connection.to !== selected.id;
+        });
+        setStatus("System und zugehoerige Verbindungen geloescht.");
+      } else {
+        state.connections = state.connections.filter((connection) => connection.id !== selected.id);
+        setStatus("Verbindung geloescht.");
+      }
+      selected = null;
+      pendingConnectionFrom = null;
+      saveState();
+      render();
+      updateInspector();
+    }
+
+    function selectSystem(id) {
+      if (mode === "connect") {
+        if (!pendingConnectionFrom) {
+          pendingConnectionFrom = id;
+          selected = { kind: "system", id };
+          setStatus("Jetzt zweites System anklicken.");
+          render();
+          updateInspector();
+          return;
+        }
+        createConnection(pendingConnectionFrom, id);
+        return;
+      }
+      selected = { kind: "system", id };
+      pendingConnectionFrom = null;
+      render();
+      updateInspector();
+    }
+
+    function selectConnection(id) {
+      selected = { kind: "connection", id };
+      pendingConnectionFrom = null;
+      render();
+      updateInspector();
+    }
+
+    function clearSelection() {
+      selected = null;
+      pendingConnectionFrom = null;
+      render();
+      updateInspector();
+    }
+
+    function renderConnections() {
+      connectionLayer.textContent = "";
+      connectionHitLayer.textContent = "";
+
+      for (const connection of state.connections) {
+        const from = findSystem(connection.from);
+        const to = findSystem(connection.to);
+        if (!from || !to) {
+          continue;
+        }
+
+        const hit = document.createElementNS("http://www.w3.org/2000/svg", "line");
+        hit.setAttribute("x1", from.x);
+        hit.setAttribute("y1", from.y);
+        hit.setAttribute("x2", to.x);
+        hit.setAttribute("y2", to.y);
+        hit.setAttribute("class", "connection-hit");
+        hit.dataset.id = connection.id;
+        hit.addEventListener("click", (event) => {
+          event.stopPropagation();
+          selectConnection(connection.id);
+        });
+        connectionHitLayer.appendChild(hit);
+
+        const line = document.createElementNS("http://www.w3.org/2000/svg", "line");
+        line.setAttribute("x1", from.x);
+        line.setAttribute("y1", from.y);
+        line.setAttribute("x2", to.x);
+        line.setAttribute("y2", to.y);
+        line.setAttribute("class", `connection ${connection.type || "standard"}`);
+        if (selected?.kind === "connection" && selected.id === connection.id) {
+          line.classList.add("is-selected");
+        }
+        connectionLayer.appendChild(line);
+      }
+    }
+
+    function beginSystemDrag(system, event) {
+      if (mode !== "select") {
+        return;
+      }
+      event.preventDefault();
+      event.stopPropagation();
+      const point = svgPointFromEvent(event);
+      drag = {
+        id: system.id,
+        startX: point.x,
+        startY: point.y,
+        systemX: system.x,
+        systemY: system.y,
+        pointerId: event.pointerId,
+        moved: false
+      };
+      selected = { kind: "system", id: system.id };
+      render();
+      updateInspector();
+    }
+
+    function handleDragMove(event) {
+      if (!drag) {
+        return;
+      }
+      const system = findSystem(drag.id);
+      if (!system) {
+        drag = null;
+        return;
+      }
+
+      event.preventDefault();
+      const point = svgPointFromEvent(event);
+      const dx = point.x - drag.startX;
+      const dy = point.y - drag.startY;
+      if (Math.abs(dx) + Math.abs(dy) > 2) {
+        drag.moved = true;
+        suppressClick = true;
+      }
+
+      const snappedPoint = snapPointToGrid(clampPoint({
+        x: drag.systemX + dx,
+        y: drag.systemY + dy
+      }));
+      system.x = snappedPoint.x;
+      system.y = snappedPoint.y;
+      system.gridX = snappedPoint.gridX;
+      system.gridY = snappedPoint.gridY;
+      render();
+    }
+
+    function handleDragEnd(event) {
+      if (!drag) {
+        return;
+      }
+      event.preventDefault();
+      const system = findSystem(drag.id);
+      if (system && drag.moved) {
+        selected = { kind: "system", id: system.id };
+        saveState();
+        updateInspector();
+        setStatus(`${system.name} verschoben.`);
+      }
+      drag = null;
+      window.setTimeout(() => {
+        suppressClick = false;
+      }, 0);
+    }
+
+    function renderSystems() {
+      systemLayer.textContent = "";
+
+      for (const system of state.systems) {
+        const group = document.createElementNS("http://www.w3.org/2000/svg", "g");
+        group.setAttribute("class", "system");
+        group.setAttribute("transform", `translate(${system.x} ${system.y})`);
+        group.dataset.id = system.id;
+        if (selected?.kind === "system" && selected.id === system.id) {
+          group.classList.add("is-selected");
+        }
+        if (pendingConnectionFrom === system.id) {
+          group.classList.add("is-pending");
+        }
+
+        const circle = document.createElementNS("http://www.w3.org/2000/svg", "circle");
+        circle.setAttribute("r", "8");
+        circle.setAttribute("class", "system-core");
+        circle.setAttribute("fill", "url(#nodeGlow)");
+
+        const label = document.createElementNS("http://www.w3.org/2000/svg", "text");
+        label.setAttribute("class", "system-label");
+        label.setAttribute("y", "-22");
+        label.textContent = system.name;
+
+        const hit = document.createElementNS("http://www.w3.org/2000/svg", "rect");
+        const hitWidth = Math.max(64, system.name.length * 11 + 24);
+        hit.setAttribute("x", -hitWidth / 2);
+        hit.setAttribute("y", "-50");
+        hit.setAttribute("width", hitWidth);
+        hit.setAttribute("height", "68");
+        hit.setAttribute("rx", "8");
+        hit.setAttribute("class", "system-hit");
+
+        group.append(hit, circle, label);
+        group.addEventListener("pointerdown", (event) => {
+          beginSystemDrag(system, event);
+        });
+        group.addEventListener("click", (event) => {
+          event.stopPropagation();
+          if (suppressClick) {
+            return;
+          }
+          selectSystem(system.id);
+        });
+
+        systemLayer.appendChild(group);
+      }
+    }
+
+    function render() {
+      const bounds = mapBounds();
+      svg.setAttribute("viewBox", `${bounds.x} ${bounds.y} ${bounds.width} ${bounds.height}`);
+      document.documentElement.style.setProperty("--map-bg", state.background || "#05080f");
+      backgroundColor.value = state.background || "#05080f";
+      renderGrid();
+      renderConnections();
+      renderSystems();
+    }
+
+    function renderGrid() {
+      gridLayer.textContent = "";
+      const bounds = mapBounds();
+      sectorBorder.setAttribute("x", bounds.x + 8);
+      sectorBorder.setAttribute("y", bounds.y + 8);
+      sectorBorder.setAttribute("width", Math.max(0, bounds.width - 16));
+      sectorBorder.setAttribute("height", Math.max(0, bounds.height - 16));
+
+      const grid = state.grid;
+      if (!grid) {
+        return;
+      }
+
+      for (let col = grid.minCol; col <= grid.maxCol; col += 1) {
+        const point = gridToPoint(col, grid.minRow);
+        const line = document.createElementNS("http://www.w3.org/2000/svg", "line");
+        line.setAttribute("x1", point.x);
+        line.setAttribute("y1", bounds.y + 20);
+        line.setAttribute("x2", point.x);
+        line.setAttribute("y2", bounds.y + bounds.height - 20);
+        line.setAttribute("class", "grid-line");
+        gridLayer.appendChild(line);
+
+        const label = document.createElementNS("http://www.w3.org/2000/svg", "text");
+        label.setAttribute("x", point.x);
+        label.setAttribute("y", bounds.y + 32);
+        label.setAttribute("class", "grid-label");
+        label.textContent = col;
+        gridLayer.appendChild(label);
+      }
+
+      for (let row = grid.minRow; row <= grid.maxRow; row += 1) {
+        const point = gridToPoint(grid.minCol, row);
+        const line = document.createElementNS("http://www.w3.org/2000/svg", "line");
+        line.setAttribute("x1", bounds.x + 20);
+        line.setAttribute("y1", point.y);
+        line.setAttribute("x2", bounds.x + bounds.width - 20);
+        line.setAttribute("y2", point.y);
+        line.setAttribute("class", "grid-line");
+        gridLayer.appendChild(line);
+
+        const label = document.createElementNS("http://www.w3.org/2000/svg", "text");
+        label.setAttribute("x", bounds.x + 32);
+        label.setAttribute("y", point.y + 4);
+        label.setAttribute("class", "grid-label");
+        label.textContent = row;
+        gridLayer.appendChild(label);
+      }
+    }
+
+    function updateInspector() {
+      systemEditor.classList.add("hidden");
+      connectionEditor.classList.add("hidden");
+
+      if (!selected) {
+        selectionMeta.textContent = "Kein Objekt ausgewaehlt.";
+        return;
+      }
+
+      if (selected.kind === "system") {
+        const system = findSystem(selected.id);
+        if (!system) {
+          clearSelection();
+          return;
+        }
+        const gridInfo = Number.isFinite(system.gridX) && Number.isFinite(system.gridY)
+          ? ` Raster ${system.gridX}, ${system.gridY}`
+          : ` ${system.x}, ${system.y}`;
+        selectionMeta.textContent = `System: ${system.name} (${gridInfo})`;
+        systemName.value = system.name;
+        systemNote.value = system.note || "";
+        systemEditor.classList.remove("hidden");
+      }
+
+      if (selected.kind === "connection") {
+        const connection = findConnection(selected.id);
+        if (!connection) {
+          clearSelection();
+          return;
+        }
+        const from = findSystem(connection.from);
+        const to = findSystem(connection.to);
+        selectionMeta.textContent = `Verbindung: ${from?.name || connection.from} -> ${to?.name || connection.to}`;
+        connectionType.value = connection.type || "standard";
+        connectionEditor.classList.remove("hidden");
+      }
+    }
+
+    function exportMap() {
+      dataBox.value = JSON.stringify(state, null, 2);
+      dataBox.focus();
+      dataBox.select();
+      setStatus("Karte exportiert.");
+    }
+
+    function importMap() {
+      try {
+        state = validateMapData(JSON.parse(dataBox.value));
+        selected = null;
+        pendingConnectionFrom = null;
+        saveState();
+        render();
+        updateInspector();
+        setStatus("Karte importiert.");
+      } catch (error) {
+        setStatus(`Import fehlgeschlagen: ${error.message}`);
+      }
+    }
+
+    async function saveRemoteMap() {
+      if (!canUseServerStorage()) {
+        setStatus("Server-Speichern braucht den Node-Server.");
+        exportMap();
+        return;
+      }
+      try {
+        const response = await fetch("/api/map", {
+          method: "PUT",
+          headers: { "content-type": "application/json" },
+          body: JSON.stringify(state)
+        });
+        if (!response.ok) {
+          throw new Error(`HTTP ${response.status}`);
+        }
+        setStatus("Karte dauerhaft gespeichert.");
+      } catch (error) {
+        setStatus(`Speichern fehlgeschlagen: ${error.message}`);
+      }
+    }
+
+    async function loadRemoteMap(options = {}) {
+      if (!canUseServerStorage()) {
+        if (!options.silent) {
+          setStatus("Server-Laden braucht den Node-Server.");
+        }
+        return;
+      }
+      try {
+        const response = await fetch("/api/map", { headers: { accept: "application/json" } });
+        if (!response.ok) {
+          throw new Error(`HTTP ${response.status}`);
+        }
+        state = validateMapData(await response.json());
+        selected = null;
+        pendingConnectionFrom = null;
+        saveState();
+        render();
+        updateInspector();
+        if (!options.silent) {
+          setStatus("Gespeicherte Karte geladen.");
+        }
+      } catch (error) {
+        if (!options.silent) {
+          setStatus(`Laden fehlgeschlagen: ${error.message}`);
+        }
+      }
+    }
+
+    function centerOnSelection() {
+      if (!selected || selected.kind !== "system") {
+        setStatus("Zum Zentrieren bitte ein System auswaehlen.");
+        return;
+      }
+      const system = findSystem(selected.id);
+      if (!system) {
+        return;
+      }
+      const width = 420;
+      const height = 320;
+      svg.setAttribute("viewBox", `${Math.max(0, system.x - width / 2)} ${Math.max(0, system.y - height / 2)} ${width} ${height}`);
+      setStatus(`${system.name} zentriert. Doppelklick auf Hintergrund setzt Ansicht zurueck.`);
+    }
+
+    toolButtons.forEach((button) => {
+      button.addEventListener("click", () => setMode(button.dataset.mode));
+    });
+
+    svg.addEventListener("click", (event) => {
+      if (event.target !== svg) {
+        return;
+      }
+      if (mode === "add") {
+        const point = svgPointFromEvent(event);
+        createSystem(point.x, point.y);
+        return;
+      }
+      clearSelection();
+    });
+
+    svg.addEventListener("dblclick", () => {
+      const bounds = mapBounds();
+      svg.setAttribute("viewBox", `${bounds.x} ${bounds.y} ${bounds.width} ${bounds.height}`);
+      setStatus("Ansicht zurueckgesetzt.");
+    });
+
+    systemName.addEventListener("input", () => {
+      if (selected?.kind !== "system") {
+        return;
+      }
+      const system = findSystem(selected.id);
+      if (!system) {
+        return;
+      }
+      system.name = systemName.value.trim() || "Unbenannt";
+      saveState();
+      render();
+      updateInspector();
+    });
+
+    systemNote.addEventListener("input", () => {
+      if (selected?.kind !== "system") {
+        return;
+      }
+      const system = findSystem(selected.id);
+      if (!system) {
+        return;
+      }
+      system.note = systemNote.value;
+      saveState();
+    });
+
+    connectionType.addEventListener("change", () => {
+      if (selected?.kind !== "connection") {
+        return;
+      }
+      const connection = findConnection(selected.id);
+      if (!connection) {
+        return;
+      }
+      connection.type = connectionType.value;
+      saveState();
+      render();
+      updateInspector();
+    });
+
+    backgroundColor.addEventListener("input", () => {
+      state.background = backgroundColor.value;
+      saveState();
+      render();
+    });
+
+    deleteSelected.addEventListener("click", deleteSelection);
+    exportJson.addEventListener("click", exportMap);
+    importJson.addEventListener("click", importMap);
+    saveRemote.addEventListener("click", saveRemoteMap);
+    loadRemote.addEventListener("click", () => loadRemoteMap());
+    centerSelection.addEventListener("click", centerOnSelection);
+    resetMap.addEventListener("click", () => {
+      state = clone(initialData);
+      selected = null;
+      pendingConnectionFrom = null;
+      const bounds = mapBounds();
+      svg.setAttribute("viewBox", `${bounds.x} ${bounds.y} ${bounds.width} ${bounds.height}`);
+      saveState();
+      render();
+      updateInspector();
+      setStatus("Vorlage neu geladen.");
+    });
+
+    window.addEventListener("keydown", (event) => {
+      if (event.key === "Delete" || event.key === "Backspace") {
+        const tag = document.activeElement?.tagName;
+        if (tag === "INPUT" || tag === "TEXTAREA") {
+          return;
+        }
+        deleteSelection();
+      }
+      if (event.key === "Escape") {
+        clearSelection();
+        setMode("select");
+      }
+    });
+    window.addEventListener("pointermove", handleDragMove);
+    window.addEventListener("pointerup", handleDragEnd);
+    window.addEventListener("pointercancel", handleDragEnd);
+
+    render();
+    updateInspector();
+    loadRemoteMap({ silent: true });
+  </script>
+</body>
+</html>
diff --git a/star-map.test.mjs b/star-map.test.mjs
new file mode 100644
index 0000000..a8e3774
--- /dev/null
+++ b/star-map.test.mjs
@@ -0,0 +1,90 @@
+import assert from "node:assert/strict";
+import { readFileSync } from "node:fs";
+import test from "node:test";
+import { buildUniverseMap } from "./build-universe-map.mjs";
+
+const html = readFileSync(new URL("./star-map.html", import.meta.url), "utf8");
+const startScript = readFileSync(new URL("./start-webserver.cmd", import.meta.url), "utf8");
+
+function extractJsonScript(id) {
+  const pattern = new RegExp(`<script type="application/json" id="${id}">([\\s\\S]*?)</script>`);
+  const match = html.match(pattern);
+  assert.ok(match, `missing JSON script #${id}`);
+  return JSON.parse(match[1]);
+}
+
+test("universe import builds a grid map from universe.ini", async () => {
+  const data = await buildUniverseMap({
+    universeDir: "C:/PROJECTS/REM/REM-Mod/DATA/UNIVERSE"
+  });
+
+  assert.equal(data.source, "universe.ini");
+  assert.equal(data.systems.length, 58);
+  assert.ok(data.connections.length >= 80, "expected direct jump connections from system INIs");
+  assert.deepEqual(data.grid, {
+    minCol: 0,
+    minRow: 0,
+    maxCol: 16,
+    maxRow: 16,
+    cellSize: 72,
+    margin: 72
+  });
+
+  const newYork = data.systems.find((system) => system.id === "li01");
+  assert.ok(newYork, "missing Li01");
+  assert.equal(newYork.name, "New York");
+  assert.equal(newYork.gridX, 7);
+  assert.equal(newYork.gridY, 8);
+  assert.equal(newYork.x, 576);
+  assert.equal(newYork.y, 648);
+
+  assert.ok(data.connections.some((connection) => connection.from === "li01" && connection.to === "li02"));
+});
+
+test("template contains the systems and connections from universe.ini", () => {
+  const data = extractJsonScript("initial-map-data");
+
+  assert.equal(data.source, "universe.ini");
+  assert.equal(data.systems.length, 58, "expected active systems from universe.ini");
+  assert.ok(data.connections.length >= 80, "expected direct route set from system INIs");
+  assert.ok(data.grid, "expected grid metadata");
+
+  for (const name of ["Tau-37", "Leeds", "New Tokyo", "Sigma-19", "New Berlin", "Omicron Prime"]) {
+    assert.ok(data.systems.some((system) => system.name === name), `missing ${name}`);
+  }
+
+  for (const connection of data.connections) {
+    assert.ok(data.systems.some((system) => system.id === connection.from), `missing source ${connection.from}`);
+    assert.ok(data.systems.some((system) => system.id === connection.to), `missing target ${connection.to}`);
+  }
+});
+
+test("editor UI exposes creation, deletion, linking, notes, and background controls", () => {
+  assert.match(html, /data-mode="add"/, "missing add-system mode");
+  assert.match(html, /data-mode="connect"/, "missing connection mode");
+  assert.match(html, /id="deleteSelected"/, "missing delete action");
+  assert.match(html, /id="systemNote"/, "missing per-system note field");
+  assert.match(html, /id="backgroundColor"/, "missing configurable background");
+  assert.match(html, /id="saveRemote"/, "missing persistent save action");
+  assert.match(html, /id="loadRemote"/, "missing persistent load action");
+  assert.doesNotMatch(html, /id="snapToGrid"/, "grid snapping must not be optional");
+  assert.match(html, /function snapPointToGrid/, "missing grid snapping behavior");
+  assert.doesNotMatch(html, /snapToGrid\.checked/, "grid snapping must always be active");
+  assert.match(html, /function createSystem/, "missing system creation behavior");
+  assert.match(html, /function createConnection/, "missing connection creation behavior");
+  assert.match(html, /async function saveRemoteMap/, "missing server save behavior");
+  assert.match(html, /async function loadRemoteMap/, "missing server load behavior");
+});
+
+test("system dragging has a forgiving hit target and stable pointer handlers", () => {
+  assert.match(html, /class", "system-hit"/, "missing large system drag hit target");
+  assert.match(html, /function handleDragMove/, "missing shared drag move handler");
+  assert.match(html, /window\.addEventListener\("pointermove", handleDragMove\)/, "missing window pointermove handler");
+  assert.match(html, /window\.addEventListener\("pointerup", handleDragEnd\)/, "missing window pointerup handler");
+});
+
+test("start script launches the local server and opens the browser", () => {
+  assert.match(startScript, /node.*server\.mjs/i, "start script must launch server.mjs with node");
+  assert.match(startScript, /127\.0\.0\.1:3000/i, "start script must open the local app URL");
+  assert.match(startScript, /Start-Process/i, "start script must open the browser");
+});
diff --git a/start-webserver.cmd b/start-webserver.cmd
new file mode 100644
index 0000000..cff902b
--- /dev/null
+++ b/start-webserver.cmd
@@ -0,0 +1,27 @@
+@echo off
+setlocal
+
+set "APP_DIR=%~dp0"
+set "PORT=3000"
+set "APP_URL=http://127.0.0.1:3000/"
+
+powershell -NoProfile -ExecutionPolicy Bypass -Command ^
+  "$ErrorActionPreference = 'Stop';" ^
+  "$appDir = $env:APP_DIR;" ^
+  "$port = [int]$env:PORT;" ^
+  "$url = $env:APP_URL;" ^
+  "$listener = Get-NetTCPConnection -LocalPort $port -State Listen -ErrorAction SilentlyContinue;" ^
+  "if (-not $listener) {" ^
+  "  Start-Process -FilePath 'node' -ArgumentList 'server.mjs' -WorkingDirectory $appDir -WindowStyle Hidden;" ^
+  "  Start-Sleep -Milliseconds 900;" ^
+  "}" ^
+  "Start-Process $url;"
+
+if errorlevel 1 (
+  echo Fehler: Server konnte nicht gestartet oder Browser nicht geoeffnet werden.
+  echo Pruefe, ob Node.js installiert ist und Port %PORT% frei ist.
+  pause
+  exit /b 1
+)
+
+endlocal