Horizontal Scroll Section

import { useEffect, useRef } from "react";

// Horizontal Scroll Section — gerado pelo Effect Prompt Lab
// Isolado em Shadow DOM para não vazar CSS. Cleanup automático no unmount.
const SETTINGS = {
  "primary": "#8b5cf6",
  "secondary": "#22d3ee",
  "background": "#0b0b12",
  "text": "#f5f5f7",
  "speed": 1,
  "duration": 2,
  "delay": 0,
  "intensity": 60,
  "opacity": 100,
  "blur": 12,
  "glow": 24,
  "scale": 1,
  "rotation": 0,
  "depth": 120,
  "perspective": 900,
  "count": 40,
  "direction": "right",
  "loop": true,
  "autoplay": true,
  "mouse": true,
  "scroll": true,
  "mobile": true,
  "reducedMotion": true,
  "start": 0,
  "end": 100,
  "prefix": "",
  "suffix": "",
  "separator": ".",
  "images": [
    "aurora",
    "city",
    "ocean",
    "forest",
    "desert"
  ],
  "headline": "Sua próxima página começa aqui",
  "transition": "fade",
  "zoom": 1.2,
  "parallax": 40,
  "scrub": 1
};

const CSS = ":host{--fx-primary:#8b5cf6;--fx-secondary:#22d3ee;--fx-bg:#0b0b12;--fx-text:#f5f5f7;--fx-speed:1;--fx-dur:2.00s;--fx-delay:0s;--fx-intensity:0.6;--fx-opacity:1;--fx-blur:12px;--fx-glow:24px;--fx-scale:1;--fx-rot:0deg;--fx-depth:120px;--fx-persp:900px;--fx-dir-x:1;--fx-dir-y:0;--fx-iter:infinite;--fx-play:running}\n.intro{min-height:80vh;display:grid;place-content:center;text-align:center;gap:10px;padding:24px}.intro h1{font:800 clamp(28px,5vw,56px)/1.05 system-ui;letter-spacing:-.03em}.outro{min-height:60vh;display:grid;place-items:center}\n.card{padding:28px;border-radius:20px;background:linear-gradient(160deg,rgba(255,255,255,.07),rgba(255,255,255,.02));border:1px solid rgba(255,255,255,.1)}.card span{font:700 12px ui-monospace,monospace;color:var(--fx-primary)}.card h3{font:700 24px system-ui;margin:8px 0}.card p{opacity:.65;line-height:1.5}.hs{height:400vh}.st{position:sticky;top:0;height:100vh;overflow:hidden;display:flex;align-items:center}.trk{display:flex;gap:24px;padding:0 6vw;will-change:transform}.pn{flex:none;width:min(70vw,520px);height:62vh;border-radius:24px;overflow:hidden;position:relative}.pn img{width:100%;height:100%;object-fit:cover}.pn figcaption{position:absolute;left:20px;bottom:18px;font:700 26px system-ui;color:#fff;text-shadow:0 4px 20px rgba(0,0,0,.5)}";
const HTML = "<div class=\"fx-hint\">Role dentro do preview ↓</div><header class=\"intro\"><h1>Scroll vertical → movimento horizontal</h1><p class=\"muted\">↓</p></header><section class=\"hs\"><div class=\"st\"><div class=\"trk\"><figure class=\"pn\"><img data-i=\"0\" alt=\"\"><figcaption>Estratégia</figcaption></figure><figure class=\"pn\"><img data-i=\"1\" alt=\"\"><figcaption>Design</figcaption></figure><figure class=\"pn\"><img data-i=\"2\" alt=\"\"><figcaption>Movimento</figcaption></figure><figure class=\"pn\"><img data-i=\"3\" alt=\"\"><figcaption>Performance</figcaption></figure><figure class=\"pn\"><img data-i=\"4\" alt=\"\"><figcaption>Conversão</figcaption></figure><figure class=\"pn\"><img data-i=\"5\" alt=\"\"><figcaption>Escala</figcaption></figure><figure class=\"pn\"><img data-i=\"6\" alt=\"\"><figcaption>Analytics</figcaption></figure></div></div></section><footer class=\"outro\"><p class=\"muted\">Fim da demonstração</p></footer>";
const RUNTIME = "(function(){\nvar FX=window.FX;\nFX.reduced=!!FX.reducedMotion&&window.matchMedia('(prefers-reduced-motion: reduce)').matches;\nFX.isTouch=window.matchMedia('(hover: none)').matches;\nif(FX.reduced)document.documentElement.classList.add('fx-reduced');\nwindow.$=function(s,r){return (r||document).querySelector(s)};\nwindow.$$=function(s,r){return Array.prototype.slice.call((r||document).querySelectorAll(s))};\nFX.clamp=function(v,a,b){return Math.min(b,Math.max(a,v))};\nFX.lerp=function(a,b,t){return a+(b-a)*t};\nFX.tick=function(fn){var id,t0=performance.now(),run=true;function f(t){if(run&&!document.hidden)fn((t-t0)/1000*FX.speed,t);if(run)id=requestAnimationFrame(f)}id=requestAnimationFrame(f);return{stop:function(){run=false;cancelAnimationFrame(id)}}};\nFX.pointer=function(el,cb){el=el||document.body;var last=-1e9;function mv(e){var p=e.touches?e.touches[0]:e;var r=el.getBoundingClientRect();last=performance.now();cb((p.clientX-r.left)/r.width,(p.clientY-r.top)/r.height,true,p.clientX-r.left,p.clientY-r.top)}\nif(FX.mouse){el.addEventListener('mousemove',mv);el.addEventListener('touchmove',mv,{passive:true});el.addEventListener('touchstart',mv,{passive:true});}\nif(FX.autoplay&&!FX.reduced)FX.tick(function(t){if(performance.now()-last>2500){var x=.5+Math.sin(t*.9)*.3,y=.5+Math.cos(t*1.3)*.25;var r=el.getBoundingClientRect();cb(x,y,false,x*r.width,y*r.height)}})};\nFX.progress=function(el){var r=el.getBoundingClientRect();var d=r.height-innerHeight;return d<=0?0:FX.clamp(-r.top/d,0,1)};\nFX.visible=function(el){var r=el.getBoundingClientRect();return FX.clamp((innerHeight-r.top)/(innerHeight+r.height),0,1)};\nFX.onScroll=function(cb){var q=false;function h(){if(q)return;q=true;requestAnimationFrame(function(){q=false;cb(scrollY)})}if(FX.scroll)addEventListener('scroll',h,{passive:true});cb(scrollY)};\nFX.inView=function(els,cb,th){var io=new IntersectionObserver(function(es){es.forEach(function(e){cb(e.target,e.isIntersecting,e)})},{threshold:th||.2});els.forEach(function(e){io.observe(e)});return io};\nFX.img=function(i,w,h){var s=(FX.images&&FX.images[i%5])||('fx'+i);if(/^(https?:|data:|\\/)/.test(s))return s;return 'https://picsum.photos/seed/'+encodeURIComponent(s+(i>=5?i:''))+'/'+(w||800)+'/'+(h||600)};\nFX.canvas=function(el){var c=document.createElement('canvas');c.style.cssText='position:absolute;inset:0;width:100%;height:100%;display:block';el.appendChild(c);var ctx=c.getContext('2d');var o={c:c,ctx:ctx,w:0,h:0};function rs(){var d=Math.min(2,devicePixelRatio||1);o.w=el.clientWidth;o.h=el.clientHeight;c.width=o.w*d;c.height=o.h*d;ctx.setTransform(d,0,0,d,0,0)}rs();addEventListener('resize',rs);return o};\nFX.hex=function(h,a){h=h.replace('#','');if(h.length===3)h=h.split('').map(function(x){return x+x}).join('');var n=parseInt(h,16);return 'rgba('+(n>>16&255)+','+(n>>8&255)+','+(n&255)+','+(a==null?1:a)+')'};\nwindow.$$=window.$$;document.querySelectorAll('[data-fx-headline]').forEach(function(e){if(FX.headline)e.textContent=FX.headline});\nFX.fmt=function(v,dec){var s=Math.round(v).toString();if(FX.separator)s=s.replace(/\\B(?=(\\d{3})+(?!\\d))/g,FX.separator);return (FX.prefix||'')+s+(FX.suffix||'')};\n})();";
const EFFECT = "$$('.pn img').forEach(function(i){i.src=FX.img(+i.dataset.i,900,1100)});var t=$('.trk'),cur=0,tgt=0,mode='auto';FX.onScroll(function(){tgt=FX.progress($('.hs'))});FX.tick(function(){cur=FX.lerp(cur,tgt,.1);var max=t.scrollWidth-innerWidth;var ltr=mode==='ltr'||(mode==='auto'&&FX.direction==='right');var x=ltr?-(1-cur)*max:-cur*max;t.style.transform='translateX('+x+'px)'});";

export default function HorizontalScrollSection() {
  const hostRef = useRef<HTMLDivElement>(null);

  useEffect(() => {
    const host = hostRef.current;
    if (!host) return;
    // Para produção, prefira portar o EFFECT para hooks nativos (useEffect + refs).
    const iframe = document.createElement("iframe");
    iframe.title = "Horizontal Scroll Section";
    iframe.setAttribute("sandbox", "allow-scripts");
    iframe.style.cssText = "width:100%;height:100%;border:0;display:block";
    iframe.srcdoc =
      "<!doctype html><html><head><style>" + CSS.replace(":host", ":root") + "</style></head><body>" + HTML +
      "<script>window.FX=" + JSON.stringify(SETTINGS) + ";" + RUNTIME + ";(function(){" + EFFECT + "})()<\/script></body></html>";
    host.appendChild(iframe);
    return () => {
      iframe.remove(); // destrói RAF, listeners e observers do efeito
    };
  }, []);

  return <div ref={hostRef} className="relative h-[480px] w-full overflow-hidden rounded-2xl" aria-label="Horizontal Scroll Section" />;
}