body {
  font-family: system-ui, Arial, sans-serif;
  background: #f7f8fa;
  color: #222;
  margin: 0;
  padding: 0;
  min-height: 100dvh;
}
.container {
  max-width: 420px;
  margin: 0 auto;
  padding: 28px 8px 0 8px;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  box-sizing: border-box;
}
h1 {
  font-size: 1.6em;
  margin-bottom: 32px;
  margin-top: 8px;
  font-weight: 700;
  color: #0d47a1;
  letter-spacing: 0.01em;
}
.pay-form {
  width: 100%;
  margin-bottom: 22px;
  display: flex;
  justify-content: center;
}
.pay-btn {
  width: 100%;
  max-width: 360px;
  padding: 18px 0;
  font-size: 1.20em;
  font-weight: 600;
  background: #27ae60;         /* Colore piatto, nessun gradiente */
  color: #fff;
  border: none;
  border-radius: 14px;
  box-shadow: 0 2px 12px 0 #1112a015;
  margin: 0 auto;
  cursor: pointer;
  transition: background .2s, transform .1s;
  outline: none;
}
.pay-btn:active {
  background: #219150;
  transform: scale(0.97);
}
.logo-footer {
  margin-top: 12px;
  height: 96px;
  border-radius: 10px;
  box-shadow: 0 0 7px #27ae60;
}
.customer-block {
  margin-top: 30px;
  color: #777;
  font-size: 1em;
  text-align: center;
}
@media (max-width: 500px) {
  .container { padding-top: 12vw; }
  .pay-btn { font-size: 1.12em; padding: 15px 0; }
  h1 { font-size: 1.1em; }
}