:root {
  --bg: #0b1220;
  --panel: #111a2b;
  --line: #273246;
  --text: #e8edf7;
  --muted: #9cb0d0;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Inter, Arial, sans-serif;
  background: linear-gradient(180deg, #0a1220, #0d1526);
  color: var(--text);
}
.page { min-height: 100vh; padding: 32px 16px; }
.card {
  background: rgba(17,26,43,.92);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 24px;
  box-shadow: 0 20px 60px rgba(0,0,0,.35);
}
.center { margin: 10vh auto 0; }
.narrow { max-width: 720px; }
.payment-shell {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: start;
}
.brand-panel {
  padding: 20px;
}
.brand-logo { max-height: 64px; max-width: 240px; margin-bottom: 20px; }
.summary {
  margin-top: 24px;
  display: grid;
  gap: 12px;
}
.summary div {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 16px;
  border-radius: 14px;
  background: rgba(255,255,255,.03);
  border: 1px solid rgba(255,255,255,.06);
}
.summary span, .hint, p { color: var(--muted); }
.payment-card { max-width: 560px; }
#payment-element { margin: 16px 0 20px; }
.btn {
  width: 100%;
  border: 0;
  border-radius: 12px;
  color: white;
  font-weight: 700;
  padding: 14px 18px;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  text-align: center;
}
.btn.inline { width: auto; }
.message {
  margin-bottom: 12px;
  padding: 12px 14px;
  border-radius: 10px;
  background: rgba(220, 38, 38, .12);
  border: 1px solid rgba(220,38,38,.25);
  color: #ffb4b4;
}
.hidden { display: none; }
code {
  background: rgba(255,255,255,.08);
  padding: 3px 8px;
  border-radius: 8px;
}
@media (max-width: 900px) {
  .payment-shell { grid-template-columns: 1fr; }
}