diff --git a/frontend/src/components/dashboard/PulseSensorCard.tsx b/frontend/src/components/dashboard/PulseSensorCard.tsx
index 4a9ab1e..d4a9b04 100644
--- a/frontend/src/components/dashboard/PulseSensorCard.tsx
+++ b/frontend/src/components/dashboard/PulseSensorCard.tsx
@@ -24,6 +24,12 @@ interface PulseSensorCardProps {
 export function PulseSensorCard({ reading, history, onClick }: PulseSensorCardProps) {
     const navigate = useNavigate();
 
+    // Determine offline status (older than 15 mins)
+    const now = new Date();
+    const readingTime = new Date(reading.timestamp);
+    const diffMinutes = (now.getTime() - readingTime.getTime()) / 1000 / 60;
+    const isOffline = diffMinutes > 15;
+
     // Determine status color based on VPD (gold standard for crop health)
     const getStatusColor = (vpd: number) => {
         if (vpd < 0.8 || vpd > 1.2) return 'text-amber-500'; // Warning
@@ -31,7 +37,11 @@ export function PulseSensorCard({ reading, history, onClick }: PulseSensorCardPr
         return 'text-emerald-500'; // Good
     };
 
-    const statusColor = getStatusColor(reading.vpd);
+    // If offline, use neutral/error color for metrics
+    const statusColor = isOffline ? 'text-slate-400 dark:text-slate-500' : getStatusColor(reading.vpd);
+    const badgeColor = isOffline
+        ? 'text-rose-500 bg-rose-500/10 border-rose-500/20'
+        : cn("bg-slate-100 dark:bg-slate-800 border border-slate-200 dark:border-slate-700", statusColor);
 
     // Simple Sparkline
     const Sparkline = ({ data, color = "#10b981", width = 120, height = 40 }: { data: number[], color?: string, width?: number, height?: number }) => {
@@ -74,7 +84,12 @@ export function PulseSensorCard({ reading, history, onClick }: PulseSensorCardPr
         >
             <div className="flex justify-between items-start mb-4">
                 <div className="flex gap-3 items-center">
-                    <div className="p-2.5 rounded-xl bg-emerald-500/10 text-emerald-500 ring-1 ring-emerald-500/20">
+                    <div className={cn(
+                        "p-2.5 rounded-xl ring-1",
+                        isOffline
+                            ? "bg-slate-100 text-slate-400 ring-slate-200 dark:bg-slate-800 dark:text-slate-500 dark:ring-slate-700"
+                            : "bg-emerald-500/10 text-emerald-500 ring-emerald-500/20"
+                    )}>
                         <Activity size={18} />
                     </div>
                     <div>
@@ -85,8 +100,8 @@ export function PulseSensorCard({ reading, history, onClick }: PulseSensorCardPr
                     </div>
                 </div>
 
-                <div className={cn("text-[10px] font-bold px-2 py-0.5 rounded-full bg-slate-100 dark:bg-slate-800 border border-slate-200 dark:border-slate-700", statusColor)}>
-                    {reading.timestamp ? 'LIVE' : 'OFFLINE'}
+                <div className={cn("text-[10px] font-bold px-2 py-0.5 rounded-full border", badgeColor)}>
+                    {isOffline ? 'OFFLINE' : 'LIVE'}
                 </div>
             </div>
 
@@ -96,7 +111,7 @@ export function PulseSensorCard({ reading, history, onClick }: PulseSensorCardPr
                         <Thermometer size={12} />
                         <span className="text-[10px] font-bold uppercase tracking-wider">Temp</span>
                     </div>
-                    <p className="text-2xl font-bold text-[var(--color-text-primary)]">
+                    <p className={cn("text-2xl font-bold transition-colors", isOffline ? "text-slate-400" : "text-[var(--color-text-primary)]")}>
                         {reading.temperature.toFixed(1)}°
                     </p>
                 </div>
@@ -106,7 +121,7 @@ export function PulseSensorCard({ reading, history, onClick }: PulseSensorCardPr
                         <Droplets size={12} />
                         <span className="text-[10px] font-bold uppercase tracking-wider">RH</span>
                     </div>
-                    <p className="text-2xl font-bold text-[var(--color-text-primary)]">
+                    <p className={cn("text-2xl font-bold transition-colors", isOffline ? "text-slate-400" : "text-[var(--color-text-primary)]")}>
                         {reading.humidity.toFixed(0)}%
                     </p>
                 </div>
@@ -116,17 +131,26 @@ export function PulseSensorCard({ reading, history, onClick }: PulseSensorCardPr
                         <CloudFog size={12} />
                         <span className="text-[10px] font-bold uppercase tracking-wider">VPD</span>
                     </div>
-                    <p className={cn("text-2xl font-bold", statusColor)}>
+                    <p className={cn("text-2xl font-bold transition-colors", statusColor)}>
                         {reading.vpd.toFixed(2)}
                     </p>
                 </div>
 
-                <div className="flex items-end justify-end">
-                    {history && history.temperature && (
+                <div className="flex flex-col items-end justify-end">
+                    {history && history.temperature && !isOffline && (
                         <div className="mb-1">
                             <Sparkline data={history.temperature} color={reading.temperature > 80 ? '#f43f5e' : '#10b981'} />
                         </div>
                     )}
+
+                    {isOffline && (
+                        <div className="text-right">
+                            <p className="text-[10px] font-medium text-rose-500">Last Updated</p>
+                            <p className="text-[10px] text-[var(--color-text-tertiary)]">
+                                {readingTime.toLocaleTimeString([], { hour: '2-digit', minute: '2-digit' })}
+                            </p>
+                        </div>
+                    )}
                 </div>
             </div>
         </motion.div>