.opening-effect-child_birthday_v3{z-index:9999;-webkit-backdrop-filter:blur(3px);cursor:pointer;background:#fff9f7f5;justify-content:center;align-items:center;transition:opacity .6s;display:flex;position:fixed;inset:0}.opening-effect-child_birthday_v3 .audio-overlay{justify-content:center;align-items:center;width:100%;height:100%;display:flex;position:absolute;top:0;left:0}.opening-effect-child_birthday_v3.hidden,.opening-effect-child_birthday_v3.fade-out{opacity:0;pointer-events:none}.opening-effect-child_birthday_v3 .envelope-wrapper{perspective:1000px;width:280px;height:200px;position:relative}.opening-effect-child_birthday_v3 .envelope{z-index:2;width:100%;height:100%;transform-style:preserve-3d;background:#fff;border-radius:0 0 15px 15px;transition:transform .6s;position:relative;box-shadow:0 15px 35px #c55b7726}.opening-effect-child_birthday_v3 .envelope-flap{z-index:3;transform-origin:top;border-top:100px solid #f8b4c8;border-left:140px solid #0000;border-right:140px solid #0000;width:0;height:0;transition:transform .6s .2s;position:absolute;top:0;left:0}.opening-effect-child_birthday_v3 .envelope-front{z-index:4;border-bottom:100px solid #f8b4c8;border-left:140px solid #fae8eb;border-right:140px solid #fae8eb;border-radius:0 0 15px 15px;width:0;height:0;position:absolute;bottom:0;left:0}.opening-effect-child_birthday_v3 .envelope-card{z-index:2;background:#fff;border:2px dashed #f8b4c8;border-radius:10px;justify-content:center;align-items:center;height:180px;transition:transform .6s .4s;display:flex;position:absolute;bottom:10px;left:10px;right:10px;box-shadow:0 5px 15px #0000000d}.opening-effect-child_birthday_v3 .card-content{text-align:center}.opening-effect-child_birthday_v3 .card-icon{margin-bottom:10px;font-size:3rem;animation:2s infinite cb3HeartBeat}.opening-effect-child_birthday_v3 .card-text{color:#c55b77;margin:0;font-family:Dancing Script,Great Vibes,cursive;font-size:1.8rem;font-weight:700}.opening-effect-child_birthday_v3 .envelope-shadow{filter:blur(8px);background:#c55b771a;border-radius:50%;width:80%;height:20px;position:absolute;bottom:-20px;left:50%;transform:translate(-50%)}.opening-effect-child_birthday_v3.opening .envelope-flap{z-index:1;transform:rotateX(180deg)}.opening-effect-child_birthday_v3.opening .envelope-card{transform:translateY(-80px)}.opening-effect-child_birthday_v3.opening .envelope{transform:translateY(30px)}.opening-effect-child_birthday_v3:before,.opening-effect-child_birthday_v3:after{content:"✨";opacity:.4;font-size:1.5rem;animation:4s ease-in-out infinite cb3FloatStars;position:absolute}.opening-effect-child_birthday_v3:before{top:20%;left:20%}.opening-effect-child_birthday_v3:after{animation-delay:-2s;bottom:20%;right:20%}@keyframes cb3FloatStars{0%,to{transform:translateY(0)rotate(0)}50%{transform:translateY(-20px)rotate(20deg)}}@keyframes cb3HeartBeat{0%,to{transform:scale(1)}50%{transform:scale(1.15)}}