.ttb-stc-wrapper{max-width:400px;margin:30px auto;font-family:system-ui,Roboto,Arial,sans-serif}
.ttb-heading{text-align:center;font-size:1.5rem;margin-bottom:1rem;font-weight:600}
label{display:block;margin-bottom:10px;font-size:.95rem}
input,select{width:100%;padding:8px;border:1px solid #ccc;border-radius:6px;font-size:1rem}
.ttb-btn-row{margin-top:10px;display:flex;gap:10px}
.ttb-btn{background:#0073aa;color:#fff;border:none;border-radius:6px;padding:8px 18px;font-size:1rem;cursor:pointer;transition:.2s}
.ttb-btn:hover{background:#006297}
.ttb-clear{background:#777}
.ttb-clear:hover{background:#666}
.ttb-result{margin-top:15px;font-size:1.2rem;font-weight:600;text-align:center}
/* breakdown table */
.ttb-breakdown{
  width:100%;
  margin-top:12px;
  border-collapse:collapse;
  font-size:.95rem;
}
.ttb-breakdown td{
  padding:6px 4px;
  border:1px solid #dee2e6;
}
.ttb-breakdown td:first-child{
  font-weight:600;
  width:60%;
}