.sd-container{
max-width:600px;
margin:40px auto;
background:#fff;
padding:30px;
border-radius:8px;
box-shadow:0 10px 30px rgba(0,0,0,0.08);
}

.sd-title{
font-size:26px;
margin-bottom:20px;
text-align:center;
}

.sd-row{
display:flex;
gap:10px;
margin-bottom:15px;
}

.sd-row input,
.sd-row select{
flex:1;
padding:12px;
font-size:16px;
}

.sd-btn{
width:100%;
padding:14px;
background:#2c6df2;
color:#fff;
border:none;
cursor:pointer;
font-size:16px;
}

.sd-error{
color:red;
margin-top:10px;
display:none;
}

.sd-result{
margin-top:50px;
padding:20px;
background:#f5f7fb;
border-radius:6px;
display:none;
font-size:18px;
}

@media(max-width:600px){
.sd-row{flex-direction:column;}
}