.thft{max-width:640px;margin:24px auto;padding:24px;border:1px solid #e2e8f0;border-radius:14px;background:#fff;box-shadow:0 4px 18px rgba(15,23,42,.06);font-family:inherit;color:#0f172a;box-sizing:border-box}
.thft *{box-sizing:border-box}
.thft [hidden]{display:none!important}
.thft-title{display:block;font-weight:600;margin-bottom:8px}
.thft-pair{display:flex;gap:12px}
.thft-field{flex:1;display:flex;align-items:center;gap:8px;border:1px solid #cbd5e1;border-radius:10px;padding:0 12px;background:#fff}
.thft-field:focus-within{border-color:#2563eb;box-shadow:0 0 0 3px rgba(37,99,235,.15)}
.thft-field input{flex:1;min-width:0;border:0!important;outline:0!important;box-shadow:none!important;padding:12px 0;font-size:20px;background:transparent;color:#0f172a}
.thft-field span{color:#64748b;font-weight:600}
.thft-opts{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;margin-top:16px}
.thft-opts select{padding:6px 8px;border:1px solid #cbd5e1;border-radius:8px;margin-left:6px}
.thft-swap{background:#f1f5f9;border:1px solid #cbd5e1;border-radius:10px;padding:8px 16px;font-size:15px;font-weight:600;cursor:pointer;color:#0f172a;transition:.15s}
.thft-swap:hover{background:#dbeafe;border-color:#2563eb}
.thft-result{margin-top:18px;padding:18px;border-radius:12px;background:#eff6ff;border:1px solid #bfdbfe;text-align:center}
.thft-result small{display:block;color:#64748b}
.thft-res{display:block;font-size:34px;color:#1d4ed8;margin:4px 0 12px;word-break:break-word}
.thft-btn{background:#2563eb;color:#fff;border:0;border-radius:10px;padding:9px 22px;font-size:15px;font-weight:600;cursor:pointer;transition:.15s}
.thft-btn:hover{background:#1d4ed8}
.thft-extra{display:flex;gap:12px;margin-top:14px;flex-wrap:wrap}
.thft-extra-item{flex:1;min-width:150px;padding:12px;border-radius:10px;background:#f8fafc;border:1px solid #e2e8f0;text-align:center}
.thft-extra-item small{display:block;color:#64748b}
.thft-extra-item strong{font-size:18px}
.thft-formula{margin:14px 0 0;text-align:center;color:#475569;font-size:14px}
.thft-msg{margin:8px 0 0;min-height:1.2em;text-align:center;font-size:14px;color:#15803d;font-weight:600}
.thft-msg.thft-err{color:#b91c1c}
@media(max-width:480px){.thft{padding:16px}.thft-res{font-size:28px}}