.stc-wrapper{display:flex;justify-content:center;padding:20px;font-family:system-ui;}
.stc-card{width:100%;max-width:420px;background:#fff;border-radius:16px;padding:20px;
box-shadow:0 4px 12px rgba(0,0,0,0.08);border:1px solid #eee;}
.stc-field{margin-bottom:12px;}
.stc-field label{font-weight:600;font-size:15px;}
.stc-field input,.stc-field select{width:100%;padding:10px;font-size:16px;
border:1px solid #ccc;border-radius:10px;margin-top:5px;}
.stc-btn{width:100%;padding:12px;background:#007bff;color:#fff;border:none;border-radius:10px;
font-size:17px;cursor:pointer;margin-top:10px;}
.stc-btn:hover{background:#005fcc;}
.stc-output{margin-top:20px;padding:15px;background:#f8f8f8;border-radius:12px;border:1px solid #ddd;}
.stc-res-head{font-size:20px;font-weight:700;margin-bottom:10px;}
.stc-res-block{padding:10px;background:white;border-radius:10px;border:1px solid #ddd;margin-bottom:10px;}
.stc-error{color:red;font-weight:700;padding:10px;}