:root{--verde-profundo:#0b2e22;--dorado:#c9a24b;--dorado-claro:#e8caa0;--tinta:#3a2f1c;--env-ratio:900 / 582;--flap-h:53.3%;--seal-w:19%;--seal-cx:50%;--seal-cy:53.3%;--papel-ratio:700 / 1083}.stage-wrap{height:360vh;position:relative}.stage{background:0 0;justify-content:center;align-items:center;height:100svh;display:flex;position:sticky;top:0;overflow:hidden}.envelope-scene{z-index:8;width:min(72vw,400px);aspect-ratio:var(--env-ratio);perspective:1800px;position:relative}.env-base{object-fit:contain;z-index:1;filter:drop-shadow(0 30px 60px #0000008c);width:100%;height:100%;position:absolute;inset:0}.env-flap-wrap{width:100%;height:var(--flap-h);transform-origin:50% 0;transform-style:preserve-3d;-webkit-transform-style:preserve-3d;will-change:transform;z-index:3;position:absolute;top:0;left:0}.env-flap-wrap img{object-fit:fill;backface-visibility:hidden;filter:drop-shadow(0 10px 16px #0006);width:100%;height:100%;position:absolute;inset:0}.flap-front{transform:rotateX(0)translateZ(.1px)}.flap-back{transform:rotateX(180deg)translateZ(.1px)}.env-seal{left:var(--seal-cx);top:var(--seal-cy);width:var(--seal-w);transform-origin:50%;z-index:4;will-change:transform, opacity;filter:drop-shadow(0 6px 12px #00000080);height:auto;position:absolute;transform:translate(-50%,-50%)}.seal-glow{left:var(--seal-cx);top:var(--seal-cy);width:calc(var(--seal-w) * 1.6);aspect-ratio:1;z-index:2;pointer-events:none;opacity:0;background:radial-gradient(circle,#e9be6e80 0%,#e9be6e00 70%);border-radius:50%;position:absolute;transform:translate(-50%,-50%)}.paper{width:84%;aspect-ratio:var(--papel-ratio);transform-origin:50% 100%;z-index:10;opacity:0;pointer-events:none;will-change:transform, opacity;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)scale(.4)}.paper img{object-fit:contain;filter:drop-shadow(0 30px 50px #00000073);width:100%;height:100%;position:absolute;inset:0}.paper .paper-text{text-align:center;color:var(--tinta);flex-direction:column;justify-content:center;align-items:center;font-family:Georgia,Iowan Old Style,serif;display:flex;position:absolute;inset:13% 10% 15%}.paper .eyebrow{letter-spacing:.22em;text-transform:uppercase;color:#8a6a2e;margin-bottom:clamp(4px,1.5vw,8px);font-size:clamp(8px,2.4vw,10px)}.paper h2{margin:0 0 clamp(3px,1vw,6px);font-size:clamp(16px,4.6vw,23px);font-weight:400;line-height:1.15}.paper .sub{letter-spacing:.06em;color:#6b5a35;margin-bottom:clamp(8px,2.5vw,14px);font-size:clamp(9px,2.4vw,11px)}.paper .divider{background:var(--dorado);width:34px;height:1px;margin:4px 0 clamp(8px,2.5vw,12px)}.paper .line{letter-spacing:.01em;max-width:34ch;font-size:clamp(9.5px,2.9vw,12px);line-height:1.62}@media (width<=768px){.envelope-scene{transform:translateY(-7vh)}}@media (prefers-reduced-motion:reduce){.stage-wrap{height:auto}.stage{position:relative}}