:root {
  color-scheme: dark;
  --bg: #080706;
  --panel: rgba(30, 27, 22, 0.96);
  --panel-soft: rgba(255, 255, 255, 0.035);
  --gold: #e7bb55;
  --gold-soft: #9c7832;
  --text: #f7f3eb;
  --muted: #c8beb0;
  --danger: #ff9a8f;
  --ok: #9cffb4;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 70% 10%, rgba(171, 117, 24, 0.18), transparent 34%),
    radial-gradient(circle at 12% 65%, rgba(110, 69, 17, 0.16), transparent 30%),
    var(--bg);
}
.checkout-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 48px 18px;
}
.checkout-card {
  width: min(760px, 100%);
  background: linear-gradient(145deg, rgba(38, 34, 28, 0.98), rgba(15, 14, 12, 0.98));
  border: 1px solid rgba(231, 187, 85, 0.36);
  border-radius: 28px;
  padding: clamp(24px, 5vw, 48px);
  box-shadow: 0 30px 90px rgba(0, 0, 0, 0.5), inset 0 1px rgba(255, 255, 255, 0.04);
}
.checkout-header h1 {
  margin: 8px 0 12px;
  font-size: clamp(38px, 6vw, 62px);
  line-height: 0.98;
  letter-spacing: -0.045em;
}
.checkout-header p { color: var(--muted); line-height: 1.6; }
.eyebrow { color: var(--gold) !important; font-size: 12px; font-weight: 900; letter-spacing: 0.15em; }
.plan-summary {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin: 28px 0;
}
.plan-summary div {
  padding: 16px;
  border: 1px solid rgba(231, 187, 85, 0.18);
  background: var(--panel-soft);
  border-radius: 16px;
}
.plan-summary span { display: block; color: var(--gold); font-size: 10px; font-weight: 900; letter-spacing: 0.09em; margin-bottom: 8px; }
.plan-summary strong { font-size: 16px; }
form { display: grid; gap: 18px; }
label { display: grid; gap: 8px; font-weight: 750; }
label small { color: var(--muted); font-weight: 500; }
input {
  width: 100%;
  border-radius: 15px;
  border: 1px solid rgba(231, 187, 85, 0.28);
  background: rgba(2, 2, 2, 0.58);
  color: var(--text);
  padding: 15px 16px;
  font: inherit;
  outline: none;
}
input:focus { border-color: var(--gold); box-shadow: 0 0 0 3px rgba(231, 187, 85, 0.12); }
button {
  border: 1px solid #f3d684;
  border-radius: 999px;
  padding: 16px 22px;
  font: inherit;
  font-weight: 950;
  letter-spacing: 0.04em;
  color: #161007;
  background: linear-gradient(180deg, #f6d982, #bd8420);
  cursor: pointer;
  box-shadow: 0 12px 38px rgba(189, 132, 32, 0.23);
}
button:disabled { opacity: 0.6; cursor: wait; }
.status { min-height: 22px; color: var(--muted); }
.status.error { color: var(--danger); }
.status.ok { color: var(--ok); }
.back-link { text-align: center; color: var(--gold); text-decoration: none; font-weight: 800; }
.security-note { margin: 25px 0 0; color: var(--muted); font-size: 13px; line-height: 1.55; text-align: center; }
@media (max-width: 700px) {
  .checkout-shell { padding: 18px 12px; align-items: start; }
  .checkout-card { border-radius: 22px; padding: 24px 18px; }
  .plan-summary { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}