feat: choreograph hero devices on scroll

src/app/(marketing)/page.tsx

@@ -96,7 +96,7 @@ const accessFit = [
 export default function HomePage() {
   return (
     <>
-      <section className="relative isolate min-h-[calc(100svh-4rem)] overflow-hidden px-4 pt-14 sm:px-6 sm:pt-20 lg:pt-24">
+      <section className="relative isolate min-h-[calc(100svh-4rem)] overflow-x-clip px-4 pt-14 sm:px-6 sm:pt-20 lg:pt-24">
         <div className="bg-primary-light/55 absolute top-0 left-1/2 -z-10 h-[38rem] w-[68rem] max-w-[120vw] -translate-x-1/2 rounded-full blur-3xl" />
         <div className="mx-auto max-w-7xl text-center">
           <div className="animate-fade-in-up flex items-center justify-center gap-3">
@@ -127,13 +127,14 @@ export default function HomePage() {
           </div>
         </div>
 
-        <div className="relative mx-auto mt-12 h-[44rem] max-w-5xl sm:h-[58rem] lg:mt-8 lg:h-[64rem]">
+        <div className="pitch-hero-stage relative mx-auto mt-12 h-[190svh] max-w-5xl lg:mt-8">
+          <div className="sticky top-16 h-[calc(100svh-4rem)]">
             <div className="absolute top-24 left-1/2 w-[17rem] -translate-x-[86%] -rotate-6 sm:top-28 sm:w-[22rem] lg:top-32 lg:w-[26rem]">
               <ProductDevice
                 src="/screenshots/product-bezel-2026-08-20/summary-natural.webp"
                 darkSrc="/screenshots/product-bezel-2026-08-20/summary-natural-dark.webp"
                 alt="Medscribe visit summary in a natural titanium iPhone product bezel"
-              className="pitch-device-motion pitch-device-drift-left"
+                className="pitch-hero-phone pitch-hero-phone-left"
                 sizes="(min-width: 1024px) 416px, (min-width: 640px) 352px, 272px"
                 priority
               />
@@ -143,13 +144,14 @@ export default function HomePage() {
                 src="/screenshots/product-bezel-2026-08-20/home-black.webp"
                 darkSrc="/screenshots/product-bezel-2026-08-20/home-black-dark.webp"
                 alt="Medscribe home screen in a black titanium iPhone product bezel"
-              className="pitch-device-motion pitch-device-drift-right"
+                className="pitch-hero-phone pitch-hero-phone-right"
                 sizes="(min-width: 1024px) 448px, (min-width: 640px) 368px, 288px"
                 priority
               />
             </div>
           </div>
-        <p className="text-muted-foreground relative z-20 mx-auto pb-8 text-center text-xs font-medium tracking-wide">
+        </div>
+        <p className="text-muted-foreground relative z-20 mx-auto mt-4 pb-8 text-center text-xs font-medium tracking-wide">
           Illustrative profile · Medscribe interface
         </p>
       </section>

src/styles/globals.css

@@ -129,6 +129,61 @@
   --pitch-exit-rotate: -1.25deg;
 }
 
+/* The opening pair gets its own scroll story: meet, settle, then peel apart. */
+.pitch-hero-stage {
+  perspective: 1600px;
+}
+
+.pitch-hero-phone {
+  backface-visibility: hidden;
+  transform-origin: center;
+  transform-style: preserve-3d;
+}
+
+.pitch-hero-phone-left {
+  --hero-start-x: -4rem;
+  --hero-meet-x: 1.25rem;
+  --hero-exit-x: -5rem;
+  --hero-start-rotate: -6deg;
+  --hero-meet-rotate: 1.5deg;
+  --hero-exit-rotate: -5deg;
+}
+
+.pitch-hero-phone-right {
+  --hero-start-x: 4rem;
+  --hero-meet-x: -1rem;
+  --hero-exit-x: 5rem;
+  --hero-start-rotate: 6deg;
+  --hero-meet-rotate: -1.5deg;
+  --hero-exit-rotate: 5deg;
+}
+
+@keyframes pitch-hero-phone-scroll {
+  0% {
+    opacity: 0.38;
+    transform: translate3d(var(--hero-start-x), 4rem, -7rem) scale(0.86)
+      rotate(var(--hero-start-rotate));
+  }
+  30% {
+    opacity: 1;
+    transform: translate3d(0, 0.75rem, 0) scale(0.985) rotate(0deg);
+  }
+  58% {
+    opacity: 1;
+    transform: translate3d(var(--hero-meet-x), -2rem, 4rem) scale(1.04)
+      rotate(var(--hero-meet-rotate));
+  }
+  78% {
+    opacity: 1;
+    transform: translate3d(0, -3.5rem, 1rem) scale(1.015) rotate(0deg);
+  }
+  100% {
+    opacity: 0.76;
+    transform: translate3d(var(--hero-exit-x), -10rem, -4rem) scale(0.94)
+      rotate(var(--hero-exit-rotate));
+  }
+}
+
 @keyframes pitch-device-scroll {
   0% {
     opacity: 0.42;
@@ -172,6 +227,14 @@
   }
 }
 
+@supports (animation-timeline: scroll()) {
+  .pitch-hero-phone {
+    animation: pitch-hero-phone-scroll linear both;
+    animation-timeline: scroll(root block);
+    animation-range: 0px 1500px;
+  }
+}
+
 @supports (animation-timeline: view()) {
   .pitch-device-motion {
     animation: pitch-device-scroll linear both;
@@ -194,6 +257,18 @@
 
 /* Keep the product choreography visible on phones without crowding the copy. */
 @media (max-width: 639px) {
+  .pitch-hero-phone-left {
+    --hero-start-x: -1.5rem;
+    --hero-meet-x: 0.5rem;
+    --hero-exit-x: -1.75rem;
+  }
+
+  .pitch-hero-phone-right {
+    --hero-start-x: 1.5rem;
+    --hero-meet-x: -0.5rem;
+    --hero-exit-x: 1.75rem;
+  }
+
   .pitch-device-motion {
     --pitch-enter-y: 4rem;
     --pitch-exit-y: -3rem;
@@ -229,6 +304,7 @@
   }
 
   .pitch-device-motion,
+  .pitch-hero-phone,
   .pitch-copy-motion,
   .pitch-card-motion {
     animation: none !important;