:root{
  --plum:#17050c; --wine:#4a0f22; --rose:#e8527a; --blush:#f7c6d3; --cream:#fff1ec; --gold:#e9b872;
  --serif:"Cormorant Garamond",Georgia,serif; --sans:"Outfit",system-ui,sans-serif;
  box-sizing:border-box; padding-top:env(safe-area-inset-top,0px); padding-bottom:env(safe-area-inset-bottom,0px);
}
*,*::before,*::after{box-sizing:inherit}
html{height:100%;scroll-padding-top:env(safe-area-inset-top,0px)}
body{
  margin:0;height:100%;overflow:hidden;color:var(--cream);font-family:var(--sans);
  -webkit-user-select:none;user-select:none;-webkit-touch-callout:none;caret-color:transparent;-webkit-tap-highlight-color:transparent;
  background:radial-gradient(ellipse at 50% 35%,var(--wine) 0%,var(--plum) 70%);
  display:flex;align-items:center;justify-content:center;text-align:center;
}
.screen{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:24px;
  opacity:0;visibility:hidden;transition:opacity .9s ease,visibility .9s}
.screen.on{opacity:1;visibility:visible}
h1,h2{font-family:var(--serif);font-weight:500;margin:0}
p{margin:0}
button{font:inherit;cursor:pointer;border:0}
button:focus-visible{outline:2px solid var(--gold);outline-offset:4px}

/* envelope */
#s1{overflow:hidden}
.glow{position:absolute;width:520px;height:520px;max-width:140vw;border-radius:50%;pointer-events:none;
  background:radial-gradient(circle,rgba(255,150,120,.22),rgba(232,82,122,.1) 45%,transparent 70%);animation:flick 4s ease-in-out infinite}
@keyframes flick{50%{opacity:.7;transform:scale(1.06)}}
.intro{position:relative;font-family:var(--serif);font-style:italic;font-size:clamp(1.7rem,6.4vw,2.3rem);margin-bottom:44px;color:var(--blush);transition:opacity .6s}
.hint{position:relative;margin-top:44px;font-size:.9rem;font-weight:300;letter-spacing:.04em;color:var(--blush);opacity:.8;transition:opacity .6s}
.opening .intro,.opening .hint{opacity:0}
.stage{position:relative;width:min(320px,80vw);aspect-ratio:3/2;perspective:1000px;cursor:pointer;-webkit-tap-highlight-color:transparent}
.stage::after{content:"";position:absolute;left:6%;right:6%;bottom:-20px;height:22px;border-radius:50%;background:rgba(0,0,0,.55);filter:blur(12px);z-index:-1}
.inside{position:absolute;inset:0;z-index:0;border-radius:4px;background:linear-gradient(#6d1a3f,#4a1030)}
.card{position:absolute;left:7%;right:7%;top:7%;height:86%;z-index:2;display:flex;flex-direction:column;align-items:center;padding-top:12%;
  background:linear-gradient(180deg,#fff7f2,#ffe6e8);border-radius:3px;box-shadow:0 2px 8px rgba(0,0,0,.25);color:#7a2147;
  transition:transform 1.1s .75s cubic-bezier(.25,.8,.3,1)}
.card small{font-family:var(--serif);font-style:italic;font-size:1rem;color:#a4577a}
.card b{font-family:var(--serif);font-style:italic;font-weight:600;font-size:clamp(1.8rem,8vw,2.4rem);line-height:1.1}
.card .cr{width:38px;height:38px;color:var(--rose);margin-top:8px}
.pocket{position:absolute;inset:0;width:100%;height:100%;z-index:3;display:block}
.flap{position:absolute;left:0;top:0;width:100%;height:56%;z-index:4;transform-origin:top;transition:transform .4s ease-in}
.flap svg{width:100%;height:100%;display:block}
.flap2{position:absolute;left:0;top:-56%;width:100%;height:56%;z-index:1;transform:scaleY(0);transform-origin:bottom;
  clip-path:polygon(50% 0,0 100%,100% 100%);transition:transform .45s ease-out .4s;
  background:radial-gradient(circle,rgba(232,82,122,.35) 1.5px,transparent 2px) 0 0/14px 14px,linear-gradient(#f5a9bd,#ffd9e2)}
.seal{position:absolute;left:50%;top:100%;width:54px;height:54px;margin:-27px 0 0 -27px;display:grid;place-items:center;font-size:22px;color:#ffd1dc;
  border-radius:52% 48% 50% 50%/50% 52% 48% 50%;background:radial-gradient(circle at 35% 30%,#ff7a9c,#b0214f 60%,#8c1a40);
  text-shadow:0 -1px 1px rgba(0,0,0,.4),0 1px 1px rgba(255,255,255,.3);
  box-shadow:0 3px 8px rgba(0,0,0,.45),inset 0 0 0 4px rgba(176,33,79,.6),inset 0 0 0 5px rgba(255,160,185,.35);animation:beat 1.8s ease-in-out infinite}
@keyframes beat{50%{transform:scale(1.1)}}
.seal svg{width:34px;height:34px;color:#ffb3c6;filter:drop-shadow(0 -1px 0 rgba(0,0,0,.4))}
.open .flap{transform:scaleY(0)}
.open .flap2{transform:scaleY(1)}
.open .seal{animation:crack .35s ease-out forwards}
@keyframes crack{30%{transform:scale(1.2) rotate(-10deg)}100%{transform:scale(.5) rotate(8deg);opacity:0}}
.open .card{transform:translateY(-52%)}
.open.lift .card{transform:translateY(-62%) scale(1.12);opacity:0;transition:transform .8s ease,opacity .7s ease}
.rise{position:absolute;left:50%;top:35%;z-index:6;color:var(--c);font-size:var(--s);pointer-events:none;opacity:0;animation:rise 2.6s ease-out var(--d) forwards}
@keyframes rise{0%{opacity:0;transform:translate(0,0) scale(.4)}15%{opacity:1}100%{opacity:0;transform:translate(var(--x),-200px) scale(1)}}
.fh{position:absolute;bottom:-30px;width:var(--w);height:calc(var(--w)*1.25);border-radius:80% 0 80% 0;background:var(--rose);opacity:0;pointer-events:none;animation:drift var(--t) linear infinite;animation-delay:var(--d)}
@keyframes drift{0%{opacity:0;transform:translateY(0)}15%{opacity:.35}85%{opacity:.2}100%{opacity:0;transform:translateY(-110vh) translateX(var(--x)) rotate(300deg)}}

/* letter */
.line{font-family:var(--serif);font-style:italic;font-weight:500;font-size:clamp(1.5rem,5.6vw,2.3rem);line-height:1.3;max-width:22ch;
  min-height:8.5em;display:flex;align-items:center;justify-content:center;transition:opacity .6s,transform .6s}
.line.out{opacity:0;transform:translateY(8px)}
.next{margin-top:18px;background:transparent;color:var(--cream);border:1px solid rgba(247,198,211,.5);border-radius:999px;padding:12px 30px;font-weight:300;letter-spacing:.04em;transition:background .25s}
.next:hover{background:rgba(232,82,122,.25)}
.dots{display:flex;gap:8px;margin-top:30px}
.dots i{width:7px;height:7px;border-radius:50%;background:rgba(247,198,211,.25);transition:background .4s,transform .4s}
.dots i.d{background:var(--rose);transform:scale(1.25)}

/* ask */
.ask h2{font-size:clamp(2.2rem,9vw,3.6rem);font-style:italic;max-width:14ch;line-height:1.15}
.sub{margin:16px 0 34px;font-weight:300;color:var(--blush);min-height:3em;max-width:30ch;line-height:1.5}
.btns{display:flex;flex-direction:column;gap:14px;align-items:center;width:100%}
.yes{background:var(--rose);color:#fff;border-radius:999px;padding:16px 44px;font-weight:500;font-size:1.05rem;box-shadow:0 8px 24px rgba(232,82,122,.45);transition:transform .2s}
.yes:hover{transform:scale(1.05)}
.wait{background:none;color:var(--blush);text-decoration:underline;text-underline-offset:5px;font-weight:300;padding:8px}

/* promises */
.done h2{font-size:clamp(2.1rem,8vw,3.2rem);font-style:italic;margin-bottom:22px}
.done ul{list-style:none;margin:0 0 26px;padding:0;max-width:34ch;text-align:left}
.done li{padding-left:28px;position:relative;margin:12px 0;font-weight:300;line-height:1.45}
.done li::before{content:"♥";position:absolute;left:0;color:var(--rose)}
.sign{font-family:var(--serif);font-style:italic;font-size:1.7rem;color:var(--gold)}
.bigrose{width:96px;height:96px;color:var(--rose);margin-bottom:10px;filter:drop-shadow(0 0 18px rgba(232,82,122,.55))}
.done.on .bigrose{animation:bloom 1.6s ease-out both}
@keyframes bloom{from{transform:scale(.3) rotate(-60deg);opacity:0}to{transform:none;opacity:1}}

/* petals */
.petal{position:fixed;top:-30px;z-index:10;pointer-events:none;width:14px;height:18px;border-radius:80% 0 80% 0;
  background:var(--c);opacity:.9;animation:fall var(--t) linear forwards}
@keyframes fall{to{transform:translate(var(--x),110vh) rotate(var(--r))}}
@media (prefers-reduced-motion:reduce){
  .seal,.glow{animation:none}.petal,.rise,.fh{animation-duration:0s;display:none}
  .screen,.line,.card,.flap,.flap2{transition-duration:.01s}
}