body {margin:0;font-family:Poppins;background:#f6efe7;}
.envelope {height:100vh;display:flex;justify-content:center;align-items:center;background:linear-gradient(#e6d2bd,#f6efe7);}
.seal {width:120px;height:120px;border-radius:50%;background:#c48a5a;color:white;display:flex;align-items:center;justify-content:center;font-size:32px;cursor:pointer;}
.hidden {display:none;}
.scratch-card{position:relative;width:280px;height:80px;margin:20px auto;}
.scratch-text{position:absolute;width:100%;height:100%;background:#fff;display:flex;align-items:center;justify-content:center;z-index:1;}
canvas{position:absolute;top:0;left:0;z-index:2;}
.btn{background:#c48a5a;color:white;padding:10px 20px;border-radius:8px;text-decoration:none;}