feat(docs): add animated product website

docs/components/reveal.tsx

@@ -0,0 +1,52 @@
+"use client";
+
+import type { CSSProperties, ReactNode } from "react";
+import { useEffect, useRef } from "react";
+
+type RevealProps = {
+  children: ReactNode;
+  className?: string;
+  delay?: number;
+};
+
+export function Reveal({ children, className = "", delay = 0 }: RevealProps) {
+  const targetRef = useRef<HTMLDivElement>(null);
+
+  useEffect(() => {
+    const root = document.documentElement;
+    root.classList.add("motion-ready");
+    const target = targetRef.current;
+    if (!target) return;
+    const reduceMotion = window.matchMedia("(prefers-reduced-motion: reduce)").matches;
+
+    if (reduceMotion || !("IntersectionObserver" in window)) {
+      target.classList.add("is-visible");
+      return;
+    }
+
+    const observer = new IntersectionObserver(
+      (entries) => {
+        entries.forEach((entry) => {
+          if (!entry.isIntersecting) return;
+          entry.target.classList.add("is-visible");
+          observer.unobserve(entry.target);
+        });
+      },
+      { rootMargin: "0px 0px -10%", threshold: 0.08 },
+    );
+
+    observer.observe(target);
+    return () => observer.disconnect();
+  }, []);
+
+  return (
+    <div
+      ref={targetRef}
+      className={`reveal ${className}`.trim()}
+      data-reveal
+      style={{ "--reveal-delay": `${delay}ms` } as CSSProperties}
+    >
+      {children}
+    </div>
+  );
+}