:root{--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}*{box-sizing:border-box}body{color:#0f172a;background:#f3f4f6;margin:0;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Arial,sans-serif}.container{background:#f3f4f6;place-items:center;min-height:100vh;padding:20px;display:grid}.card{color:#0f172a;background:#fff;border:1px solid #e2e8f0;border-radius:20px;width:100%;max-width:580px;padding:30px;box-shadow:0 18px 40px #0f172a14}.card-header{align-items:flex-start;gap:14px;margin-bottom:24px;display:flex}.brand-icon{background:#f8fafc;border:1px solid #e2e8f0;border-radius:14px;flex-shrink:0;place-items:center;width:44px;height:44px;display:grid}.brand-icon svg{stroke:#111827;stroke-width:1.8px;stroke-linecap:round;stroke-linejoin:round;width:22px;height:22px}h1{color:#020617;margin:0;font-size:1.4rem;font-weight:700}h2{color:#0f172a;margin:0;font-size:.96rem;font-weight:600}.subtitle{color:#64748b;margin:4px 0 0;font-size:.93rem;line-height:1.4}.form{gap:14px;display:grid}.preset-group{grid-template-columns:repeat(4,1fr);gap:8px;display:grid}.preset-btn{color:#0f172a;cursor:pointer;background:#f8fafc;border:1px solid #e2e8f0;border-radius:10px;padding:10px 4px;font-size:.9rem;font-weight:600;transition:background .15s,border-color .15s,transform .15s}.preset-btn:hover:not(:disabled){background:#f1f5f9;border-color:#94a3b8;transform:translateY(-1px)}.preset-btn:disabled{opacity:.5;cursor:not-allowed}.input-group{gap:8px;display:grid}label{color:#334155;font-size:.84rem;font-weight:600}input,textarea,button{font:inherit}.input-prefix-wrapper{background:#fff;border:1px solid #cbd5e1;border-radius:12px;align-items:center;transition:border-color .2s,box-shadow .2s;display:flex;overflow:hidden}.input-prefix-wrapper:focus-within{border-color:#0f172a;box-shadow:0 0 0 4px #0f172a14}.input-prefix{color:#64748b;-webkit-user-select:none;user-select:none;padding:13px 10px 13px 14px;font-size:.95rem;font-weight:600}input{color:#0f172a;background:0 0;border:none;outline:none;flex:1;padding:13px 14px 13px 4px;font-size:1.02rem}input::placeholder{color:#94a3b8}input:disabled{opacity:.6}textarea{color:#0f172a;resize:vertical;word-break:break-all;cursor:text;background:#f8fafc;border:1px solid #cbd5e1;border-radius:12px;outline:none;width:100%;min-height:130px;padding:14px 15px;font-size:.83rem;line-height:1.5;transition:border-color .2s,background-color .2s}textarea:focus{background:#fff;border-color:#0f172a}button{color:#fff;cursor:pointer;background:#0f172a;border:none;border-radius:12px;justify-content:center;align-items:center;gap:8px;padding:13px 16px;font-size:.92rem;font-weight:700;transition:background .2s,opacity .2s,transform .2s;display:flex}button:hover:not(:disabled){background:#020617;transform:translateY(-1px)}button:disabled{opacity:.55;cursor:not-allowed}button.btn-copied{background:#0f766e}button.btn-copied:hover:not(:disabled){background:#115e59}.button-icon{stroke:currentColor;stroke-width:2px;stroke-linecap:round;stroke-linejoin:round;fill:none;width:16px;height:16px}.spinner{border:2px solid #fff6;border-top-color:#fff;border-radius:50%;width:14px;height:14px;animation:.65s linear infinite spin;display:inline-block}@keyframes spin{to{transform:rotate(360deg)}}.alert{border-radius:12px;align-items:flex-start;gap:10px;margin-top:16px;margin-bottom:0;padding:12px 14px;font-size:.875rem;display:flex}.alert strong{text-transform:uppercase;letter-spacing:.04em;font-size:.8rem;display:block}.alert-icon{stroke:currentColor;stroke-width:2px;stroke-linecap:round;stroke-linejoin:round;fill:none;flex-shrink:0;width:18px;height:18px;margin-top:1px}.alert span{line-height:1.45}.error{color:#c53030;background:#fff5f5;border:1px solid #fed7d7}.success{color:#0f766e;background:#f0fdfa;border:1px solid #99f6e4}.result{border-top:1px solid #e2e8f0;gap:20px;margin-top:24px;padding-top:20px;display:grid}.qr-wrapper{background:#f8fafc;border:1px solid #e2e8f0;border-radius:14px;flex-direction:column;align-items:center;gap:12px;padding:20px;display:flex}.qr-image{border-radius:8px;width:200px;height:200px;display:block}.qr-hint{color:#64748b;text-align:center;margin:0;font-size:.82rem}.copy-section{gap:10px;display:grid}.copy-label{color:#475569;margin:0;font-size:.82rem;font-weight:600}.result-header{justify-content:space-between;align-items:baseline;gap:8px;display:flex}.transaction-id{color:#64748b;font-size:.75rem}@media (max-width:640px){.container{padding:14px}.card{border-radius:16px;padding:22px 18px}.card-header{margin-bottom:20px}}