Scale landing pet preview for small viewports.

ResizeObserver on the landing LCD drives pet sprite scale while capping LCD height so the hero preview stays proportional on mobile.

components/landing/landing-pet-preview.tsx

@@ -1,7 +1,7 @@
 "use client";
 
 import Link from "next/link";
-import { useCallback, useEffect, useState } from "react";
+import { useCallback, useEffect, useRef, useState } from "react";
 
 import { PetHabitat } from "@/components/pet/pet-habitat";
 import {
@@ -23,18 +23,49 @@ function LandingPetPreviewSkeleton() {
         <div className="h-4 w-24 animate-pulse rounded bg-muted" />
         <div className="h-2 w-16 animate-pulse rounded bg-muted" />
       </div>
-      <div className="tamagotchi-lcd aspect-[4/3] w-full animate-pulse bg-muted/40" />
+      <div className="tamagotchi-lcd tamagotchi-lcd-landing animate-pulse bg-muted/40" />
     </div>
   );
 }
 
+function computeLandingPetScale(lcdWidth: number): number {
+  return Math.min(7, Math.max(4, Math.round(lcdWidth / 36)));
+}
+
 export function LandingPetPreview() {
+  const resizeObserverRef = useRef<ResizeObserver | null>(null);
   const [isLoading, setIsLoading] = useState(true);
   const [isSignedIn, setIsSignedIn] = useState(false);
+  const [petScale, setPetScale] = useState(7);
   const [customization, setCustomization] = useState<AvatarCustomization>(
     defaultAvatarCustomization,
   );
 
+  const lcdRef = useCallback((node: HTMLDivElement | null) => {
+    resizeObserverRef.current?.disconnect();
+    resizeObserverRef.current = null;
+
+    if (!node) {
+      return;
+    }
+
+    const updateScale = (width: number) => {
+      setPetScale(computeLandingPetScale(width));
+    };
+
+    updateScale(node.getBoundingClientRect().width);
+
+    const observer = new ResizeObserver((entries) => {
+      const entry = entries[0];
+      if (entry) {
+        updateScale(entry.contentRect.width);
+      }
+    });
+
+    observer.observe(node);
+    resizeObserverRef.current = observer;
+  }, []);
+
   const loadPreview = useCallback(async () => {
     setIsLoading(true);
 
@@ -65,6 +96,12 @@ export function LandingPetPreview() {
     void loadPreview();
   }, [loadPreview]);
 
+  useEffect(() => {
+    return () => {
+      resizeObserverRef.current?.disconnect();
+    };
+  }, []);
+
   if (isLoading) {
     return <LandingPetPreviewSkeleton />;
   }
@@ -74,6 +111,9 @@ export function LandingPetPreview() {
       customization={customization}
       className="w-full max-w-sm"
       showStyleLink={false}
+      petScale={petScale}
+      lcdClassName="tamagotchi-lcd-landing"
+      lcdRef={lcdRef}
     />
   );
 

components/pet/animated-pet-sprite.tsx

@@ -13,6 +13,7 @@ import { cn } from "@/lib/utils";
 type AnimatedPetSpriteProps = {
   customization: AvatarCustomization;
   className?: string;
+  petScale?: number;
 };
 
 type WanderPosition = {
@@ -52,6 +53,7 @@ function randomPosition(current?: WanderPosition): WanderPosition {
 export function AnimatedPetSprite({
   customization,
   className,
+  petScale = 7,
 }: AnimatedPetSpriteProps) {
   const [position, setPosition] = useState<WanderPosition>({
     x: PET_WANDER_START.x,
@@ -98,7 +100,7 @@ export function AnimatedPetSprite({
             colors={customization.colors}
             variants={customization.variants}
             equippedItems={customization.equippedItems}
-            scale={7}
+            scale={petScale}
             compact
             className="!h-auto max-h-none"
           />

components/pet/pet-habitat.tsx

@@ -23,6 +23,9 @@ type PetHabitatProps = {
   className?: string;
   fillViewport?: boolean;
   showStyleLink?: boolean;
+  petScale?: number;
+  lcdClassName?: string;
+  lcdRef?: React.Ref<HTMLDivElement>;
 };
 
 const MOOD_LABELS = {
@@ -36,6 +39,9 @@ export function PetHabitat({
   className,
   fillViewport = false,
   showStyleLink = true,
+  petScale,
+  lcdClassName: lcdClassNameOverride,
+  lcdRef,
 }: PetHabitatProps) {
   const [condition, setCondition] = useState<AvatarCondition>(
     defaultAvatarCondition,
@@ -60,7 +66,9 @@ export function PetHabitat({
 
   const lcdClassName = cn(
     "tamagotchi-lcd relative",
-    fillViewport ? "tamagotchi-lcd-pet-fill" : "tamagotchi-lcd-pet-match",
+    fillViewport
+      ? "tamagotchi-lcd-pet-fill"
+      : (lcdClassNameOverride ?? "tamagotchi-lcd-pet-match"),
   );
 
   if (!isReady) {
@@ -82,9 +90,9 @@ export function PetHabitat({
         </p>
       </div>
 
-      <div className={lcdClassName}>
+      <div ref={lcdRef} className={lcdClassName}>
         <ParallaxRoomBackground roomId={roomId as RoomBackgroundId} />
-        <AnimatedPetSprite customization={customization} />
+        <AnimatedPetSprite customization={customization} petScale={petScale} />
         <div className="pointer-events-none absolute left-2 top-2 z-20 grid gap-1.5">
           <PixelGauge type="heart" value={condition.health} variant="overlay" />
           <PixelGauge type="energy" value={condition.energy} variant="overlay" />