라지 타이틀

<div class="stage"><div class="phone"><div class="notch"></div><div class="screen" id="screen">
<div class="navbar"><span id="smallTitle" class="smallTitle">Inbox</span></div>
<div class="scroller" id="scroller">
  <h1 id="bigTitle" class="bigTitle">Inbox</h1>
  <div class="item"></div><div class="item"></div><div class="item"></div>
  <div class="item"></div><div class="item"></div><div class="item"></div><div class="item"></div>
</div></div><div class="home"></div></div></div>

.stage{position:absolute;inset:0;display:grid;place-items:center;overflow:hidden}
.phone{position:relative;height:90vmin;max-height:640px;aspect-ratio:9/19.5;background:#08080c;
  border-radius:20%/8.6%;box-shadow:0 0 0 2px rgba(255,255,255,.08) inset,0 12px 30px rgba(0,0,0,.35)}
.phone .notch{position:absolute;left:50%;top:0;transform:translateX(-50%);width:38%;height:5.6%;
  background:#08080c;border-radius:0 0 46% 46%;z-index:80}
.phone .screen{position:absolute;top:7.6%;left:3%;right:3%;bottom:3%;border-radius:11%/4.6%;overflow:hidden;
  background:var(--surface);color:var(--fg)}
.phone .home{position:absolute;left:50%;bottom:1.1%;transform:translateX(-50%);width:32%;height:3px;
  border-radius:2px;background:rgba(255,255,255,.45);z-index:80}
.pfx{position:absolute;left:0;top:0;width:16px;height:16px;margin:-8px 0 0 -8px;border-radius:50%;
  background:color-mix(in srgb,var(--accent) 55%,transparent);
  box-shadow:0 0 0 6px color-mix(in srgb,var(--accent) 15%,transparent);pointer-events:none;z-index:999;
  transition:opacity .2s}
.pfx.hold{width:30px;height:30px;margin:-15px 0 0 -15px;
  box-shadow:0 0 0 9px color-mix(in srgb,var(--accent) 20%,transparent);
  transition:width .5s linear,height .5s linear,margin .5s linear,box-shadow .5s linear,opacity .2s}

.navbar{position:absolute;top:0;left:0;right:0;height:11%;display:grid;place-items:center;
  background:var(--surface);border-bottom:1px solid var(--line);z-index:10}
.smallTitle{font-weight:700;font-size:clamp(7px,2.4vmin,10px);opacity:0}
.scroller{position:absolute;inset:11% 0 0;overflow-y:auto;padding:2% 7% 8%}
.bigTitle{margin:6% 0;font-weight:800;font-size:clamp(14px,7.4vmin,24px);transform-origin:left center}
.item{height:clamp(16px,10vmin,28px);border-radius:8px;background:var(--line);margin-bottom:6%}

const pfx=document.createElement('div');pfx.className='pfx';document.body.appendChild(pfx);
const screenEl=document.getElementById('screen');
let pfxAuto=true;
function pfxHide(){pfx.style.opacity='0';}
addEventListener('pointerdown',()=>{pfxAuto=false;pfxHide();},{capture:true});
function pfxAt(fx,fy){
  const r=screenEl.getBoundingClientRect();
  const x=r.left+r.width*fx, y=r.top+r.height*fy;
  pfx.style.transform='translate('+x+'px,'+y+'px)';
  return {x,y};
}
function pfxWalk(x0,y0,x1,y1,ms){
  return new Promise(res=>{
    const start=performance.now();
    function step(now){
      if(!pfxAuto) return res();
      const p=Math.min(1,(now-start)/ms), e=1-Math.pow(1-p,3);
      pfxAt(x0+(x1-x0)*e, y0+(y1-y0)*e);
      if(p<1) requestAnimationFrame(step); else res();
    }
    requestAnimationFrame(step);
  });
}
function pfxWait(ms){
  return new Promise(res=>{
    const start=performance.now();
    function step(now){ if(!pfxAuto) return res(); if(now-start<ms) requestAnimationFrame(step); else res(); }
    requestAnimationFrame(step);
  });
}

const scroller=document.getElementById('scroller'), big=document.getElementById('bigTitle'), small=document.getElementById('smallTitle');
const THRESH=38;
function apply(scrollTop){
  const p=Math.min(1,Math.max(0,scrollTop/THRESH));
  big.style.opacity=String(1-p); big.style.transform='scale('+(1-p*0.35)+')';
  small.style.opacity=String(p);
}
scroller.addEventListener('scroll',()=>apply(scroller.scrollTop));
async function autoSeq(){
  while(pfxAuto){
    const max=scroller.scrollHeight-scroller.clientHeight;
    const start=performance.now(), dur=1400;
    while(pfxAuto){
      const t=(performance.now()-start)/dur;
      if(t>=1) break;
      const st=(1-Math.cos(t*Math.PI))/2*max;
      scroller.scrollTop=st; apply(st);
      pfxAt(0.5, 0.15+((1-Math.cos(t*Math.PI))/2)*0.65);
      await new Promise(res=>requestAnimationFrame(res));
    }
    if(!pfxAuto)break;
    await pfxWait(500);
  }
}
autoSeq();