feat(deepfield): ScrollReveal 스크롤 연출 컴포넌트

app/components/deepfield/ScrollReveal.tsx

@@ -0,0 +1,53 @@
+'use client';
+
+import { useEffect, useRef, useState } from 'react';
+
+interface Props {
+  children: React.ReactNode;
+  /** 등장 지연(ms) — 연속 항목 스태거용 */
+  delay?: number;
+  /** 'fade-up'(기본) | 'fade' | 'draw'(선 그리기용 — width 확장) */
+  variant?: 'fade-up' | 'fade' | 'draw';
+  className?: string;
+}
+
+export default function ScrollReveal({ children, delay = 0, variant = 'fade-up', className }: Props) {
+  const ref = useRef<HTMLDivElement>(null);
+  const [shown, setShown] = useState(false);
+
+  useEffect(() => {
+    // reduced-motion: 즉시 표시 (연출 생략)
+    if (window.matchMedia('(prefers-reduced-motion: reduce)').matches) {
+      setShown(true);
+      return;
+    }
+    const el = ref.current;
+    if (!el) return;
+    const io = new IntersectionObserver(
+      (entries) => {
+        if (entries[0].isIntersecting) {
+          setShown(true);
+          io.disconnect();
+        }
+      },
+      { threshold: 0.2 },
+    );
+    io.observe(el);
+    return () => io.disconnect();
+  }, []);
+
+  const hidden =
+    variant === 'fade' ? 'opacity-0' :
+    variant === 'draw' ? 'opacity-0 [transform:scaleX(0)] origin-left' :
+    'opacity-0 translate-y-6';
+
+  return (
+    <div
+      ref={ref}
+      className={`${className ?? ''} transition-all duration-700 ease-out ${shown ? 'opacity-100 translate-y-0 [transform:none]' : hidden}`}
+      style={{ transitionDelay: `${delay}ms` }}
+    >
+      {children}
+    </div>
+  );
+}