.rbd-card{
 max-width:420px;
 margin:30px auto;
 background:#fff;
 padding:25px;
 border-radius:14px;
 box-shadow:0 10px 30px rgba(0,0,0,.08);
 display:flex;
 flex-direction:column;
 gap:10px;
 font-family:Segoe UI;
}

.rbd-card input,
.rbd-card textarea,
.rbd-card button{
 padding:12px;
 border-radius:8px;
 border:1px solid #ddd;
}

.rbd-card button{
 background:#2563eb;
 color:#fff;
 border:none;
 font-size:16px;
 cursor:pointer;
}