/* C6 envelope: separate paper layers, one shared animation timeline. */
.gift-envelope-preview{position:relative;width:100%;max-width:420px;aspect-ratio:1/1.18;margin:8px auto 18px;isolation:isolate;container-type:inline-size}
.gift-envelope-body{position:absolute;width:86%;left:7%;bottom:8%;aspect-ratio:162/114;isolation:isolate;perspective:1100px;filter:none}
.gift-envelope-body::after{content:'';position:absolute;inset:90% 6% -8%;background:#000;filter:blur(18px);opacity:.32;z-index:-1;border-radius:50%}
.gift-envelope-lining{position:absolute;inset:0;background:linear-gradient(145deg,#372729,#1e191b 75%);border-radius:3px;box-shadow:inset 0 1px 0 #ffffff18;z-index:0}
.gift-envelope-card{position:absolute;width:91.36%;left:4.32%;top:3.95%;z-index:2;transform:translateY(0);will-change:transform}
.gift-envelope-card>.gift-front{margin:0;border-radius:1px;box-shadow:0 6px 16px #0005}
.gift-envelope-pocket{position:absolute;inset:0;z-index:3;overflow:hidden;border-radius:3px;clip-path:polygon(0 0,50% 45%,100% 0,100% 100%,0 100%);background:linear-gradient(115deg,#242425,#161617 60%,#202021);box-shadow:inset 0 -1px 0 #ffffff0a}
.gift-envelope-pocket::before,.gift-envelope-pocket::after{content:'';position:absolute;inset:0;pointer-events:none}
.gift-envelope-pocket::before{clip-path:polygon(0 0,51% 46%,0 100%);background:linear-gradient(135deg,#252527,#202022);}
.gift-envelope-pocket::after{clip-path:polygon(100% 0,49% 46%,100% 100%);background:linear-gradient(230deg,#222224,#1c1c1e);}
.gift-envelope-brand{position:absolute;left:9%;bottom:13%;width:28%;height:auto;z-index:1}
.gift-envelope-address{position:absolute;right:9%;bottom:13%;max-width:42%;color:#aaa;font-size:2.5cqw;letter-spacing:.08em;text-align:right;z-index:1}
.gift-envelope-address b{display:block;color:#eee;font-size:4.3cqw;letter-spacing:0;font-weight:600;line-height:1.2;margin-top:4px;overflow-wrap:anywhere}
.gift-envelope-flap{position:absolute;left:0;top:0;width:100%;height:55%;transform-origin:50% 0;transform-style:preserve-3d;transform:rotateX(0deg);z-index:5;will-change:transform}
.gift-envelope-flap-face{position:absolute;inset:0;clip-path:polygon(0 0,100% 0,50% 100%);backface-visibility:hidden;-webkit-backface-visibility:hidden;background:linear-gradient(160deg,#303032,#202022);}
.gift-envelope-flap-face::after{content:'';position:absolute;inset:0;clip-path:polygon(0 0,100% 0,50% 100%);background:linear-gradient(160deg,#ffffff0c,transparent 40%);}
.gift-envelope-flap-inner{transform:rotateY(180deg);background:linear-gradient(180deg,#392b2d,#282123);}
@media(prefers-reduced-motion:reduce){.gift-envelope-card,.gift-envelope-flap{will-change:auto}}

#panel-4>h2{scroll-margin-top:90px}