*{box-sizing:border-box}
:root{
  --bg:#060708;
  --card:#101214;
  --card-2:#14171a;
  --line:#2a2e33;
  --text:#f5f7f8;
  --muted:#9aa0a6;
  --soft:#72787f;
  --white:#ffffff;
  --danger:#ffb8b8;
  --success:#bff0cf;
}
html,body{margin:0;min-height:100%;background:var(--bg);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
body{min-height:100vh;display:grid;place-items:center;padding:32px 18px}
.shell{width:min(100%,560px)}
.brand{display:flex;align-items:center;gap:14px;justify-content:center;margin:0 0 34px}
.mark{width:42px;height:42px;border:1px solid #33383e;border-radius:14px;display:grid;place-items:center;background:#0d0f11;font-weight:800;font-size:18px;box-shadow:inset 0 0 0 1px rgba(255,255,255,.02)}
.brand-name{font-size:29px;line-height:1;font-weight:800;letter-spacing:-.8px}
.brand-subtitle{margin-top:7px;color:var(--muted);font-size:11px;letter-spacing:3px;text-transform:uppercase}
.payment-card{border:1px solid var(--line);border-radius:20px;padding:36px;background:linear-gradient(180deg,var(--card-2),var(--card));box-shadow:0 28px 80px rgba(0,0,0,.28)}
.eyebrow{font-size:11px;font-weight:700;letter-spacing:2px;color:#858b91;margin-bottom:13px}
h1{font-size:30px;line-height:1.15;margin:0 0 12px;letter-spacing:-.8px}
.lead{margin:0 0 30px;color:var(--muted);font-size:15px;line-height:1.6}
label{display:block;margin-bottom:10px;color:#a8adb3;font-size:12px;font-weight:700;letter-spacing:1.2px}
.amount-wrap{height:70px;border:1px solid #34393f;border-radius:14px;display:flex;align-items:center;padding:0 18px;background:#0b0d0f;transition:.2s ease}
.amount-wrap:focus-within{border-color:#767e87;box-shadow:0 0 0 3px rgba(255,255,255,.04)}
.amount-wrap span{font-size:15px;font-weight:700;color:#9da3a9;margin-right:14px}
.amount-wrap input{width:100%;border:0;outline:0;background:transparent;color:#fff;font-size:25px;font-weight:700;letter-spacing:-.4px}
.amount-wrap input::placeholder{color:#5b6168}
small{display:block;color:#6f757c;font-size:12px;margin-top:9px}
button,.back-link{margin-top:25px;width:100%;height:58px;border:0;border-radius:13px;background:#fff;color:#090a0b;font-size:15px;font-weight:800;display:flex;align-items:center;justify-content:center;gap:10px;text-decoration:none;cursor:pointer;transition:.2s ease}
button:hover,.back-link:hover{transform:translateY(-1px);background:#edf0f2}
button:disabled{opacity:.65;cursor:wait;transform:none}
.secure-line{margin-top:23px;border-top:1px solid #24282d;padding-top:20px;display:flex;gap:8px;align-items:center;justify-content:center;color:#737980;font-size:12px}
footer{text-align:center;color:#52575c;font-size:12px;margin-top:25px}
.alert{background:#241719;border:1px solid #5c3035;color:var(--danger);padding:13px 14px;border-radius:11px;margin:-10px 0 22px;font-size:13px;line-height:1.45}
.result-shell{padding-top:10px}
.result-card{text-align:center}
.result-icon{width:60px;height:60px;border-radius:50%;display:grid;place-items:center;margin:0 auto 23px;font-size:24px;font-weight:900;border:1px solid #3a4046;background:#121518}
.result-icon.success{color:var(--success)}
.result-icon.failed{color:var(--danger)}
.receipt-row{display:flex;justify-content:space-between;gap:20px;padding:16px 0;border-top:1px solid #292d32;text-align:left;font-size:13px}
.receipt-row span{color:#7f858b}
.receipt-row strong{text-align:right;word-break:break-all}
.back-link{margin-top:22px}
@media(max-width:600px){
  body{padding:24px 14px}
  .brand{margin-bottom:24px}
  .payment-card{padding:27px 21px;border-radius:17px}
  h1{font-size:26px}
  .lead{font-size:14px;margin-bottom:25px}
  .amount-wrap{height:66px}
  .brand-name{font-size:26px}
}