STYLED - Add a layered ambient backdrop behind all heroes

Replace the flat, empty hero background with a pure-CSS layered backdrop:
faded grid, brand glow, drifting brand orbs, grain, and a bottom fade that
blends the hero into page content. Applies to both the home hero and the
compact page heroes via HeroMotionBackdrop; respects prefers-reduced-motion.

app/globals.css

@@ -295,6 +295,133 @@ html[lang="ar"] .eyebrow {
     display: none;
   }
 
+  /* ---- Layered hero backdrop (HeroMotionBackdrop) ---- */
+  .hero-backdrop-base {
+    position: absolute;
+    inset: 0;
+    background: hsl(var(--background));
+  }
+
+  .hero-backdrop-grid {
+    position: absolute;
+    inset: 0;
+    background-image:
+      linear-gradient(hsl(var(--border) / 0.55) 1px, transparent 1px),
+      linear-gradient(90deg, hsl(var(--border) / 0.55) 1px, transparent 1px);
+    background-size: 30px 30px;
+    background-position: center top;
+    opacity: 0.55;
+    -webkit-mask-image: radial-gradient(ellipse 78% 58% at 50% 30%, #000 0%, transparent 72%);
+    mask-image: radial-gradient(ellipse 78% 58% at 50% 30%, #000 0%, transparent 72%);
+  }
+
+  .dark .hero-backdrop-grid {
+    opacity: 0.4;
+  }
+
+  .hero-backdrop-glow {
+    position: absolute;
+    inset: 0;
+    background:
+      radial-gradient(58% 46% at 50% 20%, hsl(var(--brand-primary) / 0.16), transparent 70%),
+      radial-gradient(46% 42% at 80% 10%, hsl(var(--brand-secondary) / 0.13), transparent 68%),
+      radial-gradient(48% 44% at 16% 18%, hsl(var(--brand-primary) / 0.1), transparent 66%);
+  }
+
+  .hero-orb {
+    position: absolute;
+    border-radius: 9999px;
+    filter: blur(64px);
+    will-change: transform;
+  }
+
+  .hero-orb-1 {
+    top: -10%;
+    inset-inline-start: -8%;
+    height: 32rem;
+    width: 32rem;
+    background: hsl(var(--brand-primary) / 0.18);
+    animation: hero-orb-drift-a 22s ease-in-out infinite;
+  }
+
+  .hero-orb-2 {
+    top: -6%;
+    inset-inline-end: -10%;
+    height: 28rem;
+    width: 28rem;
+    background: hsl(var(--brand-secondary) / 0.15);
+    animation: hero-orb-drift-b 27s ease-in-out infinite;
+  }
+
+  .hero-orb-3 {
+    bottom: -22%;
+    inset-inline-start: 24%;
+    height: 26rem;
+    width: 26rem;
+    background: hsl(var(--brand-primary) / 0.1);
+    animation: hero-orb-drift-a 31s ease-in-out infinite reverse;
+  }
+
+  .hero-backdrop-noise {
+    position: absolute;
+    inset: -8%;
+    opacity: 0.26;
+    mix-blend-mode: soft-light;
+  }
+
+  .dark .hero-backdrop-noise {
+    opacity: 0.1;
+  }
+
+  .hero-backdrop-floor {
+    position: absolute;
+    inset-inline: 0;
+    bottom: 0;
+    height: 40%;
+    background: linear-gradient(to bottom, transparent, hsl(var(--background)) 92%);
+  }
+
+  .hero-backdrop.is-compact .hero-backdrop-grid {
+    opacity: 0.32;
+  }
+
+  .hero-backdrop.is-compact .hero-orb {
+    opacity: 0.7;
+    filter: blur(72px);
+  }
+
+  @keyframes hero-orb-drift-a {
+    0%,
+    100% {
+      transform: translate3d(0, 0, 0) scale(1);
+    }
+    33% {
+      transform: translate3d(70px, -48px, 0) scale(1.1);
+    }
+    66% {
+      transform: translate3d(-42px, 26px, 0) scale(0.94);
+    }
+  }
+
+  @keyframes hero-orb-drift-b {
+    0%,
+    100% {
+      transform: translate3d(0, 0, 0) scale(1);
+    }
+    33% {
+      transform: translate3d(-80px, 42px, 0) scale(0.92);
+    }
+    66% {
+      transform: translate3d(38px, -24px, 0) scale(1.08);
+    }
+  }
+
+  @media (prefers-reduced-motion: reduce) {
+    .hero-orb {
+      animation: none;
+    }
+  }
+
   .hero-title-line {
     display: inline-block;
     padding-inline: 0.02em;

components/layout/hero-motion-backdrop.tsx

@@ -1,13 +1,33 @@
+import { cn } from "@/lib/utils";
+
 type HeroMotionBackdropProps = {
   compact?: boolean;
 };
 
-export function HeroMotionBackdrop({}: HeroMotionBackdropProps) {
+/**
+ * Layered ambient backdrop rendered behind every hero (home + page).
+ * Pure CSS so it needs no client JS: a faded grid for structure, a soft
+ * brand glow, slowly drifting brand orbs, a grain overlay for texture, and
+ * a bottom fade that blends the hero into the page content. The orb drift is
+ * disabled under `prefers-reduced-motion` (see globals.css).
+ */
+export function HeroMotionBackdrop({ compact = false }: HeroMotionBackdropProps) {
   return (
-    <div className="hero-sheet pointer-events-none absolute inset-0 overflow-hidden">
-      <div className="hero-sheet-base" />
-      <div className="hero-sheet-veil" />
-      <div className="hero-sheet-fade" />
+    <div
+      aria-hidden="true"
+      className={cn(
+        "hero-backdrop pointer-events-none absolute inset-0 z-0 overflow-hidden",
+        compact && "is-compact",
+      )}
+    >
+      <div className="hero-backdrop-base" />
+      <div className="hero-backdrop-grid" />
+      <div className="hero-backdrop-glow" />
+      <span className="hero-orb hero-orb-1" />
+      <span className="hero-orb hero-orb-2" />
+      <span className="hero-orb hero-orb-3" />
+      <div className="hero-noise hero-backdrop-noise" />
+      <div className="hero-backdrop-floor" />
     </div>
   );
 }