diff --git a/public/devices/README.md b/public/devices/README.md
index 2f4035d..248f09e 100644
--- a/public/devices/README.md
+++ b/public/devices/README.md
@@ -38,6 +38,11 @@ transparent canvases; the original G502 backdrop was extracted from its source
 render. Confirm redistribution terms before including them in a public release
 package.
 
+`logitech-g703.png` was supplied from Logitech G's official G703 HERO product
+gallery (`resource.logitechg.com` DAM `g703-mouse-top-angle-gallery-1.png`)
+and normalized to the same 700×700 transparent canvas as the G502 set. Confirm
+redistribution terms before including it in a public release package.
+
 `logitech-mx-master-4.png` is a line-art trace made for this repository, not a
 vendor render. Only geometry derives from the source: the outer silhouette and
 the shell seams — button split, scroll-wheel housing, thumb rest, thumb wheel,
diff --git a/public/devices/logitech-g703.png b/public/devices/logitech-g703.png
new file mode 100644
index 0000000..b2bb0b8
Binary files /dev/null and b/public/devices/logitech-g703.png differ
diff --git a/src/app/cards/LightingCard.tsx b/src/app/cards/LightingCard.tsx
index 5ef334f..5363af7 100644
--- a/src/app/cards/LightingCard.tsx
+++ b/src/app/cards/LightingCard.tsx
@@ -18,7 +18,10 @@ export function LightingCard({
   zones?: MouseLighting[];
   zoneIndex?: number;
 }): ReactNode {
-  const [selectedZone, setSelectedZone] = useState(zones && zones.length > 1 ? 1 : zoneIndex);
+  const hasLightstrip = Boolean(zones?.some((zone) => zone.hardwareZoneId != null));
+  const [selectedZone, setSelectedZone] = useState(
+    hasLightstrip && zones && zones.length > 1 ? 1 : zoneIndex,
+  );
   const activeZoneIndex = zones ? Math.min(selectedZone, zones.length - 1) : zoneIndex;
   const lighting = zones?.[activeZoneIndex] ?? suppliedLighting ?? snapshot.status?.lighting;
   if (!lighting) return null;
@@ -57,7 +60,11 @@ export function LightingCard({
             <span>RGB parts</span>
             <strong>{lighting.group ? `${lighting.group} · ${lighting.zone}` : lighting.zone}</strong>
           </div>
-          <div className="lighting-strip" role="list" aria-label="G502 X Plus lightstrip LEDs">
+          <div
+            className={`lighting-strip${hasLightstrip ? " is-lightstrip" : ""}`}
+            role="list"
+            aria-label={hasLightstrip ? "Lightstrip LEDs" : "RGB zones"}
+          >
             {zones.map((zone, index) => (
               <button
                 key={`${zone.zone}-${index}`}
diff --git a/src/control.css b/src/control.css
index 29f5720..fa38542 100644
--- a/src/control.css
+++ b/src/control.css
@@ -707,12 +707,13 @@ nav { display: grid; gap: .3rem; margin-top: 1.4rem; }
 .lighting-zone-copy { display:grid;gap:.25rem }
 .lighting-zone-copy span { color:var(--faint);font-family:var(--font-mono);font-size:.55rem;letter-spacing:.09em;text-transform:uppercase }
 .lighting-zone-copy strong { color:var(--text-hover);font-size:.82rem;font-weight:550 }
-.lighting-strip { display:grid;grid-template-columns:1.15fr repeat(8,1fr);gap:.3rem;align-items:center }
+.lighting-strip { display:grid;grid-template-columns:repeat(auto-fit,minmax(2.6rem,4rem));gap:.3rem;align-items:center }
+.lighting-strip.is-lightstrip { grid-template-columns:1.15fr repeat(8,1fr) }
 .lighting-strip button { position:relative;min-width:0;height:2.2rem;padding:0;border:1px solid color-mix(in srgb,var(--zone-color) 45%,var(--border));border-radius:7px;background:color-mix(in srgb,var(--zone-color) 74%,#090b0d);color:#fff;font-family:var(--font-mono);font-size:.52rem;box-shadow:inset 0 0 14px color-mix(in srgb,var(--zone-color) 50%,transparent);cursor:pointer }
-.lighting-strip button:first-child { margin-right:.2rem;background:var(--surface-control);box-shadow:none;color:var(--muted) }
+.lighting-strip.is-lightstrip button:first-child { margin-right:.2rem;background:var(--surface-control);box-shadow:none;color:var(--muted) }
 .lighting-strip button:hover,.lighting-strip button.is-selected { border-color:var(--ui-accent);outline:1px solid color-mix(in srgb,var(--ui-accent) 35%,transparent);outline-offset:1px }
 .lighting-strip button.is-selected::after { position:absolute;right:25%;bottom:-.48rem;left:25%;height:2px;border-radius:2px;background:var(--ui-accent);content:"" }
-@media (max-width:760px) { .lighting-zone-picker { grid-template-columns:1fr }.lighting-strip { overflow-x:auto;grid-template-columns:3.5rem repeat(8,minmax(2.2rem,1fr)) } }
+@media (max-width:760px) { .lighting-zone-picker { grid-template-columns:1fr }.lighting-strip { overflow-x:auto }.lighting-strip.is-lightstrip { grid-template-columns:3.5rem repeat(8,minmax(2.2rem,1fr)) } }
 
 .dpi-header-actions { display: flex; align-items: center; gap: .45rem; }
 .dpi-header-actions button { padding: .38rem .6rem; border: 1px solid var(--line-strong); border-radius: 6px; background: var(--surface-input); color: var(--dim); font-size: .62rem; font-weight: 700; white-space: nowrap; }
diff --git a/src/device/controller.ts b/src/device/controller.ts
index d7e9447..e43563f 100644
--- a/src/device/controller.ts
+++ b/src/device/controller.ts
@@ -3186,6 +3186,31 @@ function showSuperstrikePreview(): void {
   setReadStatus("Current: 800 DPI · 4,000 Hz");
 }
 
+function showG703PreviewProfiles(): void {
+  const actions = ["Left click", "Right click", "Middle click", "Back", "Forward", "DPI Shift", "Next DPI"] as const;
+  const currentStages = [450, 800, 1600, 12000].map((dpi) => ({ x: dpi, y: dpi, lod: 0 }));
+  onboardProfiles = [1, 2, 3].map((index) => ({
+    sector: index,
+    enabled: true,
+    isCurrent: index === 3,
+    name: `Profile ${index}`,
+    dpiStages: index === 3 ? currentStages : currentStages.slice(0, 2),
+    defaultDpiIndex: 0,
+    reportRateWireless: 1000,
+    reportRateWired: 1000,
+    angleSnapping: false,
+    powerSaveTimeoutSeconds: 60,
+    powerOffTimeoutSeconds: 300,
+    bunnyHoppingMs: null,
+    buttonAssignments: actions.map((action, button) => ({ button, action, raw: [0x80, 0, 0, 0] })),
+    gShiftAssignments: actions.map((action, button) => ({ button, action, raw: [0x80, 0, 0, 0] })),
+    crcValid: true,
+    raw: new Uint8Array(255),
+  } as OnboardProfile));
+  dpiOptions = [50, 100, 200, 400, 450, 800, 1600, 3200, 6400, 12000];
+  active = previewClient();
+}
+
 async function showFixturePreview(name: PreviewMode): Promise<void> {
   const { PREVIEW_FIXTURES } = await import("../preview-fixtures");
   await loadPreviewEntries();
@@ -3198,6 +3223,7 @@ async function showFixturePreview(name: PreviewMode): Promise<void> {
     return;
   }
   dpiOptions = [100, 200, 400, 800, 1600, 3200, 6400, 12800, 25600, 32000];
+  if (name === "g703") showG703PreviewProfiles();
   // Populate brand capabilities so preview cards that gate on capabilities still render.
   capabilities = readCapabilities();
   applyStatus(fixture.status);
diff --git a/src/preview-fixtures.ts b/src/preview-fixtures.ts
index 369b79d..395200d 100644
--- a/src/preview-fixtures.ts
+++ b/src/preview-fixtures.ts
@@ -620,6 +620,58 @@ const LOGITECH_LEGACY: MouseStatus = {
   firmware: ["MPM 12.01"],
 };
 
+const LOGITECH_G703_ZONE = (zone: string, color: string): MouseLighting => ({
+  zone,
+  modes: ["Off", "Static", "Cycling", "Wave", "Breathing single"],
+  mode: "Static",
+  color,
+  color2: null,
+  colorModes: ["Static", "Breathing single"],
+  dualColorModes: [],
+  reactiveModes: ["Cycling", "Wave", "Breathing single"],
+  speeds: [1000, 2000, 3000, 5000, 10000],
+  speed: 5000,
+  writeOnly: true,
+});
+
+/** Wired G703 capture: legacy DPI, format-3 HEAT, Primary/Logo write-only RGB. */
+const LOGITECH_G703: MouseStatus = {
+  brand: "Logitech",
+  name: "G703",
+  ui: {
+    family: "logitech-hidpp",
+    lodRequiresSurface: true,
+    hideUnsupportedPollingRates: true,
+    defaultDisplayName: "G703",
+  },
+  batteryPercent: 78,
+  batteryState: "Charging",
+  dpi: 450,
+  pollingRateHz: 1000,
+  supportedPollingRates: [125, 250, 500, 1000],
+  activeProfile: 3,
+  deviceMode: "Onboard",
+  liftOffDistance: null,
+  supportedLiftOffDistances: [],
+  connectionType: "Wired",
+  connectionDetail: "Wired USB",
+  transportIds: { USB: "C087" },
+  onboardProfileFormat: {
+    id: 3,
+    name: "HEAT",
+    base: "v1",
+    supported: true,
+    verified: true,
+    writable: true,
+  },
+  lighting: LOGITECH_G703_ZONE("Primary", "#7c5cff"),
+  lightingZones: [
+    LOGITECH_G703_ZONE("Primary", "#7c5cff"),
+    LOGITECH_G703_ZONE("Logo", "#35d59a"),
+  ],
+  firmware: ["MPM 14.02", "BOT 64.00", "RQI 04.00"],
+};
+
 /** Logi Bolt productivity mouse: DPI + battery, no report-rate or LOD feature. */
 const LOGITECH_MX_MASTER_3S: MouseStatus = {
   brand: "Logitech",
@@ -666,11 +718,12 @@ export const PREVIEW_FIXTURES: Record<FixturePreviewMode, PreviewFixture> = {
   "razer-viper-mini": { label: "Razer Viper Mini", status: RAZER_VIPER_MINI },
   "razer-cobra": { label: "Razer Cobra", status: RAZER_COBRA },
   "razer-viper-v4": { label: "Razer Viper V4 Pro", status: RAZER_VIPER_V4 },
-  teevolution: { label: "Teevolution Terra Pro", status: TEEVOLUTION },
+  "terra-pro": { label: "Teevolution Terra Pro", status: TEEVOLUTION },
   vgn: { label: "VGN F2 Master Plus", status: VGN },
   finalmouse: { label: "Finalmouse UltralightX", status: FINALMOUSE },
   ninjutso: { label: "Ninjutso Sora V3", status: NINJUTSO },
-  keychron: { label: "Keychron Nape Pro", status: KEYCHRON },
+  "nape-pro": { label: "Keychron Nape Pro", status: KEYCHRON },
   "mx-master-3s": { label: "Logitech MX Master 3S", status: LOGITECH_MX_MASTER_3S },
+  g703: { label: "Logitech G703", status: LOGITECH_G703 },
   "logitech-legacy": { label: "Logitech G402 (legacy DPI)", status: LOGITECH_LEGACY },
 };
diff --git a/src/preview-modes.ts b/src/preview-modes.ts
index e0231bc..3a7b6bb 100644
--- a/src/preview-modes.ts
+++ b/src/preview-modes.ts
@@ -25,12 +25,13 @@ export const PREVIEW_KEYS = [
   "razer-viper-mini",
   "razer-cobra",
   "razer-viper-v4",
-  "teevolution",
   "vgn",
   "finalmouse",
   "ninjutso",
-  "keychron",
+  "nape-pro",
   "mx-master-3s",
+  "g703",
+  "terra-pro",
   "logitech-legacy",
 ] as const;
 
@@ -66,12 +67,13 @@ export function parsePreviewMode(value: string | null): PreviewMode | null {
     case "razer-viper-mini": return "razer-viper-mini";
     case "razer-cobra": return "razer-cobra";
     case "razer-viper-v4": return "razer-viper-v4";
-    case "teevolution": return "teevolution";
+    case "terra-pro": return "terra-pro";
     case "vgn": return "vgn";
     case "finalmouse": return "finalmouse";
     case "ninjutso": return "ninjutso";
-    case "keychron": return "keychron";
+    case "nape-pro": return "nape-pro";
     case "mx-master-3s": return "mx-master-3s";
+    case "g703": return "g703";
     case "logitech-legacy": return "logitech-legacy";
     default: return null;
   }
diff --git a/src/supported-mice.ts b/src/supported-mice.ts
index d53dfa6..1962926 100644
--- a/src/supported-mice.ts
+++ b/src/supported-mice.ts
@@ -92,6 +92,8 @@ export const MICE: Mouse[] = [
   { brand: "Logitech", model: "G403 HERO (wired)",      status: "supported", req: 1,
     pids: [0xc08f],
     note: "PID 0xc08f — HID++ direct, DPI feature 0x2202" },
+  { brand: "Logitech", model: "G703 (wired)",           status: "supported", req: 1,
+    note: "PID 0xc087 — HID++ direct, legacy DPI 0x2201, onboard format 3 (HEAT) writable" },
   { brand: "Logitech", model: "G Pro X Superlight",     status: "supported", req: 4,
     pids: [0xc094],
     note: "PID 0xc094 — HID++ direct" },
diff --git a/src/ui/device-images.test.ts b/src/ui/device-images.test.ts
index 6b4b88d..37fc0f0 100644
--- a/src/ui/device-images.test.ts
+++ b/src/ui/device-images.test.ts
@@ -11,6 +11,13 @@ test("G502 family USB interfaces use their matching normalized artwork", () => {
   assert.equal(deviceImage(hid(0xc099)), "/devices/logitech-g502-x.png");
 });
 
+test("G703 wired PIDs and Lightspeed name fallback use the G703 render", () => {
+  assert.equal(deviceImage(hid(0xc087)), "/devices/logitech-g703.png");
+  assert.equal(deviceImage(hid(0xc090)), "/devices/logitech-g703.png");
+  assert.equal(deviceImage(hid(0xc539), "G703 HERO"), "/devices/logitech-g703.png");
+  assert.equal(deviceImage(null, "G703 Wired/Wireless Gaming Mouse"), "/devices/logitech-g703.png");
+});
+
 test("G502 X receiver artwork follows the paired mouse name", () => {
   assert.equal(deviceImage(hid(0xc547), "G502 X PLUS"), "/devices/logitech-g502-x-plus.png");
   assert.equal(deviceImage(hid(0xc547), "G502 X"), "/devices/logitech-g502-x.png");
@@ -30,6 +37,7 @@ test("fixture previews resolve product art without a HID device", () => {
   assert.equal(deviceImage(null, "Cobra"), "/devices/razer-cobra.webp");
   assert.equal(deviceImage(null, "Terra Pro"), "/devices/teevolution-terra-pro.png");
   assert.equal(deviceImage(null, "MX Master 3S"), "/devices/logitech-mx-master-3s.png");
+  assert.equal(deviceImage(null, "G703"), "/devices/logitech-g703.png");
 });
 
 test("Pulsar 4K receiver artwork follows the reported mouse name", () => {
diff --git a/src/ui/device-images.ts b/src/ui/device-images.ts
index ecc3a11..82726c2 100644
--- a/src/ui/device-images.ts
+++ b/src/ui/device-images.ts
@@ -14,6 +14,9 @@ const DEVICE_IMAGES: ReadonlyMap<string, string> = new Map([
   ["046d:c095", "/devices/logitech-g502-x-plus.png"],
   ["046d:c099", "/devices/logitech-g502-x.png"],
   ["046d:c0a8", "/devices/logitech-pro-x2-superstrike.png"],
+  // Original G703 (0xc087) and G703 HERO wired (0xc090) share the same shell.
+  ["046d:c087", "/devices/logitech-g703.png"],
+  ["046d:c090", "/devices/logitech-g703.png"],
   // M3K and M2K use the supplied M3K product artwork.
   ["0483:a462", "/devices/zaunkoenig-m3k.png"],
   ["0483:a3cf", "/devices/zaunkoenig-m3k.png"],
@@ -78,6 +81,7 @@ export function deviceImage(device: HIDDevice | null | undefined, displayName =
   if (/g502\s*x\s*plus/i.test(displayName)) return "/devices/logitech-g502-x-plus.png";
   if (/g502\s*x/i.test(displayName)) return "/devices/logitech-g502-x.png";
   if (/\bg502\b/i.test(displayName)) return "/devices/logitech-g502.png";
+  if (/\bg703\b/i.test(displayName)) return "/devices/logitech-g703.png";
   if (/mx\s*master\s*4/i.test(displayName)) return "/devices/logitech-mx-master-4.png";
   if (/superstrike/i.test(displayName)) return "/devices/logitech-pro-x2-superstrike.png";
   if (/superlight/i.test(displayName)) return "/devices/logitech-pro-x-superlight-2c.png";