:root {
  --bg: #0b0f19;
  --panel: #ffffff;
  --text: #101828;
  --muted: #667085;
  --line: #e4e7ec;
  --blue: #2563eb;
  --blue-dark: #1e40af;
  --green: #079455;
  --red: #d92d20;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: Inter, "Segoe UI", Arial, sans-serif;
  background:
    radial-gradient(circle at 20% 12%, rgba(37, 99, 235, .26), transparent 32%),
    radial-gradient(circle at 80% 18%, rgba(16, 185, 129, .18), transparent 28%),
    linear-gradient(160deg, #08111f, #121826 58%, #071018);
}

.pay-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.pay-panel {
  width: min(100%, 420px);
  display: grid;
  gap: 18px;
  padding: 24px;
  border-radius: 12px;
  background: var(--panel);
  box-shadow: 0 28px 90px rgba(0, 0, 0, .32);
}

.pay-brand {
  display: flex;
  gap: 14px;
  align-items: center;
}

.pay-mark {
  width: 46px;
  height: 46px;
  display: inline-grid;
  place-items: center;
  border-radius: 10px;
  color: #fff;
  background: linear-gradient(135deg, var(--blue), #111827);
  font-weight: 900;
}

.pay-brand p,
.pay-brand h1 {
  margin: 0;
}

.pay-brand p {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
}

.pay-brand h1 {
  margin-top: 2px;
  font-size: 26px;
  letter-spacing: 0;
}

.pay-summary {
  display: grid;
  gap: 8px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #f9fafb;
}

.pay-summary span {
  color: var(--muted);
  font-size: 13px;
}

.pay-summary strong {
  font-size: 28px;
}

.pay-summary small {
  color: var(--muted);
  font-size: 14px;
}

.pay-button {
  width: 100%;
  min-height: 48px;
  border: 0;
  border-radius: 10px;
  color: #fff;
  background: linear-gradient(135deg, var(--blue), var(--blue-dark));
  font-size: 16px;
  font-weight: 900;
  cursor: pointer;
}

.pay-button:disabled {
  cursor: wait;
  opacity: .62;
}

.pay-return {
  min-height: 42px;
  display: inline-grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--text);
  text-decoration: none;
  font-weight: 800;
}

.pay-status {
  min-height: 20px;
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.45;
}

.pay-status[data-tone="success"] { color: var(--green); }
.pay-status[data-tone="error"] { color: var(--red); }

@media (max-width: 520px) {
  .pay-shell { padding: 16px; }
  .pay-panel { padding: 20px; }
  .pay-brand h1 { font-size: 23px; }
}