:root{
  --ink:#111; --mute:#8a8a8a; --line:#dcdcdc; --bg:#f6f6f4;
  --D:min(88vw, 56dvh, 600px);
  --ease:cubic-bezier(.2,.8,.2,1);
}
*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}
html,body{height:100%;overflow:hidden;overscroll-behavior:none}
body{background:var(--bg);color:var(--ink);font:13px/1.4 -apple-system,"Helvetica Neue",Arial,sans-serif;touch-action:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}

.bar{position:fixed;inset:0 0 auto 0;z-index:20;display:flex;justify-content:space-between;align-items:center;
  padding:calc(env(safe-area-inset-top) + 16px) 18px 0;pointer-events:none}
.bar>*{pointer-events:auto}
.brand{letter-spacing:.22em;font-size:11px;font-weight:600}
.brand sup{letter-spacing:.1em;color:var(--mute);margin-left:6px;font-weight:400}
#bagBtn{border:1px solid var(--ink);border-radius:99px;padding:6px 14px;font-size:12px;background:var(--bg)}
#bagBtn b{margin-left:4px}

#stage{position:fixed;inset:0}
.tier{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2.2dvh;
  padding-top:34px;
  transition:transform .9s var(--ease),opacity .7s var(--ease),filter .9s var(--ease);will-change:transform}
.tier.cur{transform:none;opacity:1;filter:none}
.tier.next{transform:translateY(80%) scale(.8);opacity:.4;filter:blur(3px);pointer-events:none}
.tier.prev{transform:translateY(-46%) scale(.55);opacity:0;filter:blur(9px);pointer-events:none}
.tier.far{transform:translateY(140%) scale(.6);opacity:0;filter:blur(6px);pointer-events:none}
.tier.gone{transform:translateY(-70%) scale(.35);opacity:0;filter:blur(12px);pointer-events:none}

.head{text-align:center;display:flex;align-items:center;gap:14px}
.stp{width:44px;height:44px;font-size:34px;font-weight:200;line-height:1;color:var(--ink)}
.price{font-size:clamp(30px,8vw,54px);font-weight:300;letter-spacing:-.02em;line-height:1}
.price small{font-size:.32em;letter-spacing:.14em;margin-left:6px;color:var(--mute)}
.about{margin-top:6px;font-size:10.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--mute)}

.ring{position:relative;width:var(--D);height:calc(var(--D)*.72);flex:none}
.ring::before{content:"";position:absolute;left:8%;right:8%;top:calc(50% - var(--D)*.17);height:calc(var(--D)*.34);
  border:1px dashed var(--line);border-radius:50%}
.it{position:absolute;left:50%;top:50%;width:calc(var(--sw)*var(--D));height:calc(var(--sw)*var(--D));display:block;will-change:transform;cursor:grab}
.it img{width:100%;height:100%;object-fit:contain;display:block;user-select:none;-webkit-user-drag:none;pointer-events:none}
.it.in-bag::after{content:"\2713";position:absolute;right:14%;top:8%;width:20px;height:20px;border-radius:50%;
  background:var(--ink);color:#fff;font-size:11px;display:grid;place-items:center}
.it.in-bag{outline:none}

#rail{position:fixed;right:2px;top:50%;transform:translateY(-50%);z-index:15;display:flex;flex-direction:column;gap:2px}
#rail button{display:flex;align-items:center;justify-content:flex-end;gap:8px;padding:7px 4px;min-width:44px;min-height:30px;
  font-size:9.5px;letter-spacing:.06em;color:var(--mute)}
#rail button i{width:7px;height:7px;border-radius:50%;border:1px solid var(--ink);flex:none}
#rail button.on{color:var(--ink)}
#rail button.on i{background:var(--ink)}
#rail span{opacity:0;transition:opacity .3s}
#rail button.on span,#rail:hover span{opacity:1}

#hint{position:fixed;left:0;right:0;bottom:calc(env(safe-area-inset-bottom) + 14px);text-align:center;z-index:10;
  font-size:10px;letter-spacing:.2em;text-transform:uppercase;color:var(--mute);transition:opacity .4s;pointer-events:none}
#hint.off{opacity:0}

#sheet,#receipt{position:fixed;z-index:30;background:#fff;transition:transform .5s var(--ease)}
#sheet{left:12px;right:12px;bottom:calc(env(safe-area-inset-bottom) + 12px);max-width:420px;margin:0 auto;
  border-radius:18px;padding:18px 18px 16px;box-shadow:0 10px 40px rgba(0,0,0,.18);transform:translateY(140%)}
#sheet.open{transform:none}
.x{position:absolute;right:10px;top:6px;font-size:24px;width:40px;height:40px;color:var(--mute)}
.sheet-type{font-size:10px;letter-spacing:.18em;text-transform:uppercase;color:var(--mute)}
.sheet-name{font-size:18px;font-weight:500;margin-top:2px;padding-right:30px}
.sheet-price{font-size:22px;font-weight:300;margin:6px 0 12px}
.add{width:100%;background:var(--ink);color:#fff;border-radius:10px;padding:13px;font-size:12px;letter-spacing:.08em;text-transform:uppercase}

#receipt{top:0;bottom:0;right:0;width:min(92vw,360px);padding:calc(env(safe-area-inset-top) + 28px) 20px 20px;
  font-family:ui-monospace,"SF Mono",Menlo,monospace;font-size:11px;transform:translateX(110%);overflow:auto;
  box-shadow:-10px 0 40px rgba(0,0,0,.15)}
#receipt.open{transform:none}
.rc-title{text-align:center;font-size:20px;letter-spacing:.12em;margin-top:6px}
.rc-sub{text-align:center;color:var(--mute);letter-spacing:.2em;font-size:9.5px;margin:2px 0 14px}
.ln{display:grid;grid-template-columns:1fr auto;gap:2px 10px;padding:9px 0;border-top:1px dashed var(--line)}
.ln em{font-style:normal;color:var(--mute);font-size:10px}
.ln button{justify-self:end;border:1px solid var(--line);border-radius:99px;padding:1px 10px;font-size:10px}
.rc-sum{border-top:1px dashed var(--ink);padding-top:8px;display:grid;gap:3px}
.rc-sum div,.rc-total{display:flex;justify-content:space-between}
.rc-total{font-size:22px;margin:10px 0 14px;font-family:-apple-system,Helvetica,sans-serif;font-weight:300}
.barcode{height:44px;margin:16px 0 8px;background:repeating-linear-gradient(90deg,#111 0 2px,#fff 2px 4px,#111 4px 5px,#fff 5px 8px,#111 8px 11px,#fff 11px 12px)}
.rc-thanks{text-align:center;font-size:9px;letter-spacing:.14em;color:var(--mute)}
.empty{color:var(--mute);padding:22px 0;text-align:center}

#hint{display:none}
#dock{position:fixed;left:12px;right:12px;bottom:calc(env(safe-area-inset-bottom) + 14px);z-index:18;max-width:460px;margin:0 auto;
  display:flex;align-items:center;gap:10px}
.dk-main{flex:1;min-width:0;display:flex;align-items:center;gap:10px;padding:8px 14px 8px 10px;border:1px dashed #bdbdbd;
  border-radius:99px;background:rgba(255,255,255,.7);backdrop-filter:blur(8px)}
.dk-main img{width:34px;height:34px;object-fit:contain;flex:none}
.dk-main span{display:flex;flex-direction:column;min-width:0}
.dk-main b{font-size:10.5px;letter-spacing:.06em;text-transform:uppercase;font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.dk-main i{font-style:normal;font-size:10px;color:var(--mute);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
#dkAdd{width:52px;height:52px;border-radius:50%;background:var(--ink);color:#fff;font-size:26px;line-height:1;flex:none;transition:transform .25s var(--ease)}
#dkAdd.pop{transform:scale(1.25)}
.tier{padding-bottom:70px}

.tier{transition:none!important;will-change:transform,opacity,filter}

#bg{position:fixed;inset:0;width:100%;height:100%;z-index:0;pointer-events:none}
#stage{z-index:1}