*{box-sizing:border-box;margin:0;padding:0;}
body{background:#0a0a0f;color:#e0e0e0;font-family:'Inter',sans-serif;min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:24px;}
.upgrade-back{display:inline-block;color:#aaa;font-size:13px;text-decoration:none;margin-bottom:16px;align-self:flex-start;padding-left:4px;transition:color 0.2s;}
.upgrade-back:hover{color:#fff;}
.upgrade-wrap{width:100%;max-width:480px;}
.upgrade-card{background:#12121a;border:1px solid #1e1e2e;border-radius:16px;padding:36px 32px;box-shadow:0 8px 40px rgba(0,0,0,0.5);}
.upgrade-logo{display:flex;align-items:center;gap:10px;margin-bottom:24px;justify-content:center;}
.upgrade-logo img{width:52px;height:52px;border-radius:50%;object-fit:cover;}
.upgrade-brand{font-size:22px;font-weight:700;color:#F97316;}
.upgrade-brand span{color:#F97316;}
.upgrade-title{font-size:24px;font-weight:700;text-align:center;color:#fff;margin-bottom:8px;}
.upgrade-sub{text-align:center;color:#888;font-size:14px;margin-bottom:24px;}
.price-tag{text-align:center;font-size:42px;font-weight:800;color:#F97316;margin-bottom:24px;}
.price-tag span{font-size:18px;color:#888;font-weight:400;}
.coin-selector{display:flex;gap:8px;justify-content:center;margin-bottom:24px;flex-wrap:wrap;}
.coin-btn{background:#1a1a2e;border:1px solid #2a2a3e;color:#aaa;padding:8px 16px;border-radius:8px;cursor:pointer;font-size:13px;font-weight:600;transition:all 0.2s;}
.coin-btn:hover{border-color:#F97316;color:#F97316;}
.coin-btn.active{background:#F97316;border-color:#F97316;color:#fff;}
.amount-display{background:#0d0d15;border:1px solid #1e1e2e;border-radius:10px;padding:16px;text-align:center;margin-bottom:16px;}
.amount-label{display:block;font-size:11px;color:#666;text-transform:uppercase;letter-spacing:0.1em;margin-bottom:6px;}
.amount-value{display:block;font-size:28px;font-weight:700;color:#fff;font-family:'IBM Plex Mono',monospace;}
.amount-usd{display:block;font-size:12px;color:#666;margin-top:4px;}
.wallet-box{background:#0d0d15;border:1px solid #1e1e2e;border-radius:10px;padding:16px;margin-bottom:20px;}
.wallet-label{display:block;font-size:11px;color:#666;text-transform:uppercase;letter-spacing:0.1em;margin-bottom:8px;}
.wallet-row{display:flex;align-items:center;gap:10px;}
.wallet-addr{font-family:'IBM Plex Mono',monospace;font-size:12px;color:#e0e0e0;word-break:break-all;flex:1;}
.copy-btn{background:#1e1e2e;border:1px solid #2a2a3e;color:#aaa;padding:6px 12px;border-radius:6px;cursor:pointer;font-size:12px;white-space:nowrap;transition:all 0.2s;}
.copy-btn:hover{border-color:#F97316;color:#F97316;}
.copy-btn.copied{border-color:#2ecc71;color:#2ecc71;}
.tx-section{margin-bottom:20px;}
.tx-label{display:block;font-size:12px;color:#888;margin-bottom:8px;}
.tx-input{width:100%;background:#0d0d15;border:1px solid #1e1e2e;border-radius:8px;padding:12px 14px;color:#e0e0e0;font-family:'IBM Plex Mono',monospace;font-size:16px;outline:none;transition:border 0.2s;}
.tx-input:focus{border-color:#F97316;}
.verify-btn{width:100%;background:#F97316;border:none;color:#fff;padding:14px;border-radius:8px;font-size:15px;font-weight:700;cursor:pointer;margin-top:10px;transition:opacity 0.2s;}
.verify-btn:hover{opacity:0.9;}
.verify-btn:disabled{opacity:0.5;cursor:not-allowed;}
.result-box{border-radius:10px;padding:20px;margin-bottom:20px;border:1px solid #1e1e2e;}
.result-box.success{border-color:#2ecc71;background:rgba(46,204,113,0.05);}
.result-box.error{border-color:#e74c3c;background:rgba(231,76,60,0.05);}
.result-title{font-size:15px;font-weight:600;margin-bottom:12px;}
.result-box.success .result-title{color:#2ecc71;}
.result-box.error .result-title{color:#e74c3c;}
.key-wrap{margin-top:8px;}
.key-label{display:block;font-size:11px;color:#666;text-transform:uppercase;letter-spacing:0.1em;margin-bottom:8px;}
.key-row{display:flex;align-items:center;gap:10px;background:#0d0d15;border:1px solid #2a2a3e;border-radius:8px;padding:10px 12px;margin-bottom:10px;}
.key-val{font-family:'IBM Plex Mono',monospace;font-size:12px;color:#F97316;word-break:break-all;flex:1;}
.key-note{font-size:12px;color:#888;margin-bottom:6px;}
.key-expire{font-size:12px;color:#F97316;}
.upgrade-features{border-top:1px solid #1e1e2e;padding-top:20px;margin-top:4px;display:flex;flex-direction:column;gap:10px;}
.feat{display:flex;align-items:center;gap:10px;font-size:13px;color:#aaa;}
.feat-icon{color:#F97316;font-size:15px;}
@media (max-width: 1024px) {
  .tx-input{font-size:16px;}
  .upgrade-card{padding:24px 16px;}
  .price-tag{font-size:32px;}
}