* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  font-family: Tahoma, Arial, sans-serif;
  background:
    radial-gradient(circle at 50% 0%, rgba(34, 197, 94, 0.18), transparent 36%),
    linear-gradient(145deg, #f0fdf4 0%, #ffffff 48%, #eff6ff 100%);
  color: #111827;
}

.payment-card {
  width: 100%;
  max-width: 430px;
  padding: 34px 22px 24px;
  text-align: center;
  background: rgba(255, 255, 255, 0.94);
  border: 1px solid rgba(255, 255, 255, 0.86);
  border-radius: 30px;
  box-shadow: 0 28px 75px rgba(15, 23, 42, 0.16);
  backdrop-filter: blur(14px);
}

.payment-card h1 {
  margin: 0 0 24px;
  font-size: 25px;
  font-weight: 900;
  line-height: 1.6;
}

.check-circle {
  width: 154px;
  height: 154px;
  margin: 0 auto 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 104px;
  font-weight: 900;
  line-height: 1;
  background: linear-gradient(135deg, #22c55e, #16a34a);
  box-shadow: 0 20px 45px rgba(34, 197, 94, 0.34);
}

.check-circle.error {
  background: linear-gradient(135deg, #ef4444, #dc2626);
  box-shadow: 0 20px 45px rgba(239, 68, 68, 0.28);
}

.payment-card p {
  margin: 0 auto 22px;
  max-width: 340px;
  color: #64748b;
  font-size: 16px;
  line-height: 1.9;
}

.ref {
  margin: 0 auto 18px;
  padding: 12px 14px;
  border-radius: 16px;
  background: #f8fafc;
  color: #475569;
  font-size: 14px;
}

.back-button {
  display: block;
  width: 100%;
  padding: 17px 18px;
  border-radius: 18px;
  background: linear-gradient(135deg, #22c55e, #16a34a);
  color: #ffffff;
  text-decoration: none;
  font-size: 18px;
  font-weight: 900;
  box-shadow: 0 16px 32px rgba(34, 197, 94, 0.25);
}

.payment-card.error .back-button {
  background: linear-gradient(135deg, #334155, #111827);
  box-shadow: 0 16px 32px rgba(15, 23, 42, 0.22);
}