diff --git a/frontend/src/routes/_layout/index.tsx b/frontend/src/routes/_layout/index.tsx
index f85ab3e..583bae7 100644
--- a/frontend/src/routes/_layout/index.tsx
+++ b/frontend/src/routes/_layout/index.tsx
@@ -1,6 +1,8 @@
 import { createFileRoute } from "@tanstack/react-router"
 import L from "leaflet"
 import {
+  ChevronDown,
+  ChevronUp,
   Clock,
   Layers,
   Maximize,
@@ -15,13 +17,7 @@ import "leaflet/dist/leaflet.css"
 
 import { Badge } from "@/components/ui/badge"
 import { Button } from "@/components/ui/button"
-import {
-  Card,
-  CardContent,
-  CardDescription,
-  CardHeader,
-  CardTitle,
-} from "@/components/ui/card"
+import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card"
 import {
   DropdownMenu,
   DropdownMenuContent,
@@ -445,6 +441,7 @@ function Dashboard() {
   const { snapshot, status, disconnectedAt } = useTelemetryWS()
   const [baseMap, setBaseMap] = useState<BaseMapType>("amap")
   const [activeDeviceId, setActiveDeviceId] = useState<string>("")
+  const [isPanelExpanded, setIsPanelExpanded] = useState(true)
   const activeDeviceIdRef = useRef(activeDeviceId)
   activeDeviceIdRef.current = activeDeviceId
 
@@ -637,89 +634,113 @@ function Dashboard() {
             })}
           </MapContainer>
         </div>
-      </div>
 
-      {/* Selected Device Panel — placed at bottom, compact */}
-      <Card className="rounded-none border-x-0 border-b-0 shadow-none bg-background/50 backdrop-blur-sm shrink-0">
-        <CardHeader>
-          <CardTitle className="flex items-center gap-2">
-            Selected Device
-            {activeDevice?.signal_health &&
-              signalHealthBadge(activeDevice.signal_health)}
-          </CardTitle>
-          <CardDescription>
-            Click a marker on the map to view detailed device info
-          </CardDescription>
-        </CardHeader>
-        <CardContent className="grid gap-4 text-sm sm:grid-cols-2 lg:grid-cols-4 xl:grid-cols-8">
-          <div>
-            <p className="text-muted-foreground mb-1">Device ID</p>
-            <p className="font-medium break-all">
-              {activeDevice?.device_id ?? "-"}
-            </p>
-          </div>
-          <div>
-            <p className="text-muted-foreground mb-1">Latitude</p>
-            <p className="font-medium font-mono">
-              {formatCoord(activeDevice?.lat ?? null)}
-            </p>
-          </div>
-          <div>
-            <p className="text-muted-foreground mb-1">Longitude</p>
-            <p className="font-medium font-mono">
-              {formatCoord(activeDevice?.lon ?? null)}
-            </p>
-          </div>
-          <div>
-            <p className="text-muted-foreground mb-1 flex items-center gap-1">
-              <Mountain className="size-3" />
-              Altitude
-            </p>
-            <p className="font-medium font-mono">
-              {activeDevice?.alt_m !== null && activeDevice?.alt_m !== undefined
-                ? `${activeDevice.alt_m.toFixed(1)} m`
-                : "-"}
-            </p>
-          </div>
-          <div>
-            <p className="text-muted-foreground mb-1">Fix Status</p>
-            <p
-              className={`font-medium ${getFixStatusColor(activeDevice?.fix_status ?? null)}`}
+        {/* Selected Device Panel Overlay */}
+        <div
+          className={`absolute bottom-6 right-6 z-9999 w-80 max-w-[calc(100%-3rem)] transition-all duration-300 ${isPanelExpanded ? "opacity-80" : "opacity-100"}`}
+        >
+          <Card className="shadow-lg border bg-background/50 backdrop-blur-md overflow-hidden">
+            <CardHeader
+              className="p-3 flex flex-row items-center justify-between space-y-0 cursor-pointer select-none"
+              onClick={() => setIsPanelExpanded(!isPanelExpanded)}
             >
-              {getFixStatusLabel(activeDevice?.fix_status ?? null)}
-            </p>
-          </div>
-          <div>
-            <p className="text-muted-foreground mb-1 flex items-center gap-1">
-              <Satellite className="size-3" />
-              Satellites
-            </p>
-            <p className="font-medium font-mono">
-              {activeDevice?.satellites_used ?? "-"}
-            </p>
-          </div>
-          <div>
-            <p className="text-muted-foreground mb-1 flex items-center gap-1">
-              <Signal className="size-3" />
-              Signal Score
-            </p>
-            <p className="font-medium font-mono">
-              {activeDevice?.signal_health
-                ? `${activeDevice.signal_health.score}%`
-                : "-"}
-            </p>
-          </div>
-          <div>
-            <p className="text-muted-foreground mb-1 flex items-center gap-1">
-              <Clock className="size-3" />
-              Last Seen
-            </p>
-            <p className="font-medium">
-              {timeAgo(activeDevice?.last_event_time ?? null)}
-            </p>
-          </div>
-        </CardContent>
-      </Card>
+              <CardTitle className="text-sm font-semibold flex items-center gap-2">
+                Selected Device
+                {activeDevice?.signal_health &&
+                  !isPanelExpanded &&
+                  signalHealthBadge(activeDevice.signal_health)}
+              </CardTitle>
+              <div className="flex items-center gap-1">
+                {activeDevice?.signal_health &&
+                  isPanelExpanded &&
+                  signalHealthBadge(activeDevice.signal_health)}
+                <Button
+                  variant="ghost"
+                  size="icon"
+                  className="h-6 w-6 hover:bg-transparent"
+                >
+                  {isPanelExpanded ? (
+                    <ChevronDown className="size-4" />
+                  ) : (
+                    <ChevronUp className="size-4" />
+                  )}
+                </Button>
+              </div>
+            </CardHeader>
+            {isPanelExpanded && (
+              <CardContent className="p-3 pt-0 grid grid-cols-2 gap-x-4 gap-y-3 text-[11px]">
+                <div className="col-span-2">
+                  <p className="text-muted-foreground mb-0.5">Device ID</p>
+                  <p className="font-medium break-all text-xs">
+                    {activeDevice?.device_id ?? "-"}
+                  </p>
+                </div>
+                <div>
+                  <p className="text-muted-foreground mb-0.5">Latitude</p>
+                  <p className="font-medium font-mono">
+                    {formatCoord(activeDevice?.lat ?? null)}
+                  </p>
+                </div>
+                <div>
+                  <p className="text-muted-foreground mb-0.5">Longitude</p>
+                  <p className="font-medium font-mono">
+                    {formatCoord(activeDevice?.lon ?? null)}
+                  </p>
+                </div>
+                <div>
+                  <p className="text-muted-foreground mb-0.5 flex items-center gap-1">
+                    <Mountain className="size-3" />
+                    Altitude
+                  </p>
+                  <p className="font-medium font-mono">
+                    {activeDevice?.alt_m !== null &&
+                    activeDevice?.alt_m !== undefined
+                      ? `${activeDevice.alt_m.toFixed(1)} m`
+                      : "-"}
+                  </p>
+                </div>
+                <div>
+                  <p className="text-muted-foreground mb-0.5">Fix Status</p>
+                  <p
+                    className={`font-medium ${getFixStatusColor(activeDevice?.fix_status ?? null)}`}
+                  >
+                    {getFixStatusLabel(activeDevice?.fix_status ?? null)}
+                  </p>
+                </div>
+                <div>
+                  <p className="text-muted-foreground mb-0.5 flex items-center gap-1">
+                    <Satellite className="size-3" />
+                    Satellites
+                  </p>
+                  <p className="font-medium font-mono">
+                    {activeDevice?.satellites_used ?? "-"}
+                  </p>
+                </div>
+                <div>
+                  <p className="text-muted-foreground mb-0.5 flex items-center gap-1">
+                    <Signal className="size-3" />
+                    SNR
+                  </p>
+                  <p className="font-medium font-mono">
+                    {activeDevice?.signal_health
+                      ? `${activeDevice.signal_health.score}%`
+                      : "-"}
+                  </p>
+                </div>
+                <div className="col-span-2">
+                  <p className="text-muted-foreground mb-0.5 flex items-center gap-1">
+                    <Clock className="size-3" />
+                    Last Seen
+                  </p>
+                  <p className="font-medium">
+                    {timeAgo(activeDevice?.last_event_time ?? null)}
+                  </p>
+                </div>
+              </CardContent>
+            )}
+          </Card>
+        </div>
+      </div>
     </div>
   )
 }