:root{--anthracite: #1c1c1a;--anthracite-2: #232320;--anthracite-3: #2c2c2a;--line: #3a3a36;--line-soft: #2e2e2b;--gold: #fac775;--gold-bright: #fac775;--gold-dim: #8a6a34;--gold-dark: #854f0b;--text: #f1efe9;--text-dim: #b4b2a9;--text-faint: #7d7c76;--green: #8fae5c;--error: #c96a5c;--font-display: "Playfair Display", Georgia, serif;--font-body: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;--font-mono: "JetBrains Mono", monospace;--radius-sm: 8px;--radius-md: 14px;--radius-lg: 20px;--ease-out: cubic-bezier(.16, 1, .3, 1)}*{box-sizing:border-box}html{color-scheme:dark}body{margin:0;font-family:var(--font-body);background:var(--anthracite);color:var(--text);min-height:100vh;-webkit-font-smoothing:antialiased}.demo-ribbon{background:#241c0d;color:var(--gold-bright);font-size:12.5px;font-weight:600;text-align:center;padding:9px 16px;border-bottom:1px solid rgba(212,175,89,.28);display:flex;align-items:center;justify-content:center;gap:8px;letter-spacing:.01em}.demo-dot{width:7px;height:7px;border-radius:50%;background:var(--gold-bright);box-shadow:0 0 #e7c87699;animation:demoPulse 2s infinite}@keyframes demoPulse{0%{box-shadow:0 0 #e7c87680}70%{box-shadow:0 0 0 7px #e7c87600}to{box-shadow:0 0 #e7c87600}}.rc-header{border-bottom:1px solid var(--line);background:var(--anthracite-2)}.rc-header-inner{max-width:980px;margin:0 auto;padding:16px 24px;display:flex;align-items:center;justify-content:space-between}.rc-logo{display:flex;align-items:center;gap:11px;font-family:var(--font-display);font-weight:600;font-size:18px;letter-spacing:.01em;color:var(--text);text-decoration:none}.rc-logo-icon{width:30px;height:30px;flex:none}.rc-logo .coin-accent{color:var(--gold)}.rc-secure{font-size:12.5px;color:var(--text-dim);display:flex;align-items:center;gap:6px;font-weight:500}.checkout-shell{max-width:980px;margin:0 auto;padding:48px 24px 90px;display:grid;grid-template-columns:1.5fr 1fr;gap:28px;align-items:start}.panel{background:var(--anthracite-2);border:1px solid var(--line);border-radius:var(--radius-lg);padding:34px 32px;animation:panelIn .32s var(--ease-out)}@keyframes panelIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.panel[hidden]{display:none}.panel-center{text-align:center;padding:70px 32px}.panel-eyebrow{font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--gold);margin:0 0 10px}.panel h1{font-family:var(--font-display);font-size:26px;margin:0 0 10px;font-weight:700}.panel-sub{color:var(--text-dim);font-size:14px;line-height:1.6;margin:0 0 26px}.panel-back{background:none;border:none;color:var(--text-faint);font-size:12.5px;font-weight:600;cursor:pointer;padding:0 0 16px}.panel-back:hover{color:var(--gold)}.asset-list{display:flex;flex-direction:column;gap:10px;margin-bottom:24px}.asset-row{position:relative;display:flex;align-items:center;gap:14px;width:100%;text-align:left;background:var(--anthracite-3);border:1.5px solid var(--line);border-radius:var(--radius-md);padding:14px 16px;cursor:pointer;color:var(--text);font-family:var(--font-body);transition:border-color .15s var(--ease-out),background .15s var(--ease-out),transform .12s var(--ease-out)}.asset-row:hover{border-color:#d4af5959}.asset-row:active{transform:scale(.99)}.asset-row.is-selected{border-color:var(--gold);background:#d4af5914}.asset-icon{width:34px;height:34px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;font-size:15px;flex-shrink:0}.asset-icon.usdt{background:#26a17b2e;color:#3fcf9c}.asset-icon.usdc{background:#2775ca2e;color:#5b9bea}.asset-icon.dai{background:#f2a9002e;color:#f2a900}.asset-icon.btc{background:#f7931a2e;color:#f7931a}.asset-info{display:flex;flex-direction:column;gap:3px;flex:1}.asset-name{font-weight:600;font-size:14.5px}.asset-name em{font-style:normal;color:var(--text-faint);font-weight:500;margin-left:6px;font-size:12.5px}.asset-meta{font-size:12px;color:var(--text-faint)}.asset-crypto{text-align:right;font-family:var(--font-mono);font-weight:700;font-size:13.5px;color:var(--gold-bright);flex-shrink:0;white-space:nowrap}.asset-recommended{position:absolute;top:-8px;right:14px;font-size:9.5px;font-weight:700;text-transform:uppercase;letter-spacing:.04em;color:#06210c;background:var(--green);padding:3px 9px;border-radius:999px}.btn{font-family:var(--font-body);font-weight:700;font-size:14.5px;border:none;border-radius:var(--radius-sm);cursor:pointer;padding:13px 22px;transition:transform .12s var(--ease-out),box-shadow .15s var(--ease-out),filter .15s var(--ease-out),opacity .15s var(--ease-out)}.btn:active{transform:scale(.97)}.btn:disabled{opacity:.4;cursor:not-allowed}.btn:disabled:active{transform:none}.btn-block{width:100%}.btn-primary{background:var(--gold);color:#241804}.btn-primary:hover:not(:disabled){background:#f5bb5c}.pay-grid{display:grid;grid-template-columns:170px 1fr;gap:26px;align-items:start;margin-bottom:26px}.qr-wrap{text-align:center}.qr-box{width:170px;height:170px;border-radius:var(--radius-md);background:#fff;padding:10px;display:flex;align-items:center;justify-content:center}.qr-box svg{width:100%;height:100%}.qr-caption{font-size:10.5px;color:var(--text-faint);margin:8px 0 0}.detail-block{margin-bottom:18px}.detail-label{display:block;font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.05em;color:var(--text-faint);margin-bottom:7px}.detail-value-row{display:flex;align-items:center;gap:10px;background:var(--anthracite-3);border:1px solid var(--line);border-radius:var(--radius-sm);padding:10px 12px}.detail-value{flex:1;font-size:14px;font-weight:600}.detail-value.truncate{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.mono{font-family:var(--font-mono)}.copy-btn{background:#d4af591f;color:var(--gold-bright);border:1px solid rgba(212,175,89,.3);border-radius:6px;padding:5px 10px;font-size:11.5px;font-weight:700;cursor:pointer;flex-shrink:0;transition:background .15s var(--ease-out),transform .12s var(--ease-out)}.copy-btn:hover{background:#d4af5938}.copy-btn:active{transform:scale(.94)}.copy-btn.is-copied{background:#4fd48a2e;color:var(--green);border-color:#4fd48a66}.timer-row{display:flex;align-items:center;gap:9px;font-size:13px;color:var(--text-dim);font-weight:500}.status-dot{width:8px;height:8px;border-radius:50%;background:var(--gold);animation:statusPulse 1.6s infinite}@keyframes statusPulse{0%,to{opacity:1}50%{opacity:.35}}.timer{margin-left:auto;font-family:var(--font-mono);font-weight:700;color:var(--text)}.demo-controls{border-top:1px dashed var(--line);padding-top:20px}.demo-controls-label{font-size:10.5px;text-transform:uppercase;letter-spacing:.06em;color:var(--text-faint);margin:0 0 10px;text-align:center}.spinner{width:46px;height:46px;margin:0 auto 26px;border-radius:50%;border:3px solid var(--line);border-top-color:var(--gold);animation:spin .85s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.order-summary{background:var(--anthracite-2);border:1px solid var(--line);border-radius:var(--radius-lg);padding:26px 26px 22px;position:sticky;top:24px}.order-summary h2{font-family:var(--font-display);font-size:16px;margin:0 0 18px;font-weight:700}.summary-row{display:flex;justify-content:space-between;align-items:center;font-size:13px;color:var(--text-dim);padding:8px 0}.summary-row strong{color:var(--text);font-weight:600}.summary-row.summary-total{font-size:15px}.summary-row.summary-total strong{color:var(--gold-bright);font-size:17px;font-family:var(--font-mono)}.order-summary hr{border:none;border-top:1px solid var(--line);margin:8px 0}.summary-note{font-size:11px;color:var(--text-faint);line-height:1.6;margin:16px 0 0}.fx-note{font-size:11px;color:var(--text-faint);margin:7px 0 0}.fx-note[hidden]{display:none}@media (max-width: 800px){.checkout-shell{grid-template-columns:1fr}.order-summary{position:static;order:-1}.pay-grid{grid-template-columns:1fr}.qr-box{margin:0 auto}}@media (prefers-reduced-motion: reduce){*,*:before,*:after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}}