:root {
  --bg: #0f0f0f; --panel: #171717; --fg: #eee; --muted: #8a8a8a; --line: #2a2a2a;
  --red: #e33; --red-dim: #a11; --ok: #3a3;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 680px; margin: 0 auto; padding: 48px 16px 64px; }
a { color: var(--fg); }
h1 { font-size: clamp(34px, 7vw, 52px); line-height: 1.05; margin: 0 0 12px; letter-spacing: -0.02em; }
h2 { font-size: 20px; margin: 0 0 8px; }
.brand { color: var(--muted); font-size: 13px; text-transform: uppercase; letter-spacing: .1em; margin-bottom: 28px; }
.brand b { color: var(--red); }
.lede { color: #bbb; font-size: 19px; margin: 0 0 28px; }
.red { color: var(--red); }

.receipt {
  background: var(--panel); border: 1px solid var(--line); border-radius: 8px;
  padding: 18px 20px; margin: 32px 0; font-variant-numeric: tabular-nums;
}
.receipt .label { color: var(--muted); font-size: 12px; text-transform: uppercase; letter-spacing: .06em; }
.receipt .total { font-size: 44px; font-weight: 700; color: var(--red); line-height: 1.1; }
.receipt ul { list-style: none; padding: 0; margin: 14px 0 0; border-top: 1px solid var(--line); }
.receipt li { display: flex; justify-content: space-between; padding: 6px 0; border-bottom: 1px solid var(--line); }
.receipt li span:last-child { font-weight: 600; }

.cta { display: flex; gap: 12px; flex-wrap: wrap; margin: 8px 0 12px; }
.btn {
  display: inline-block; padding: 12px 18px; border-radius: 6px; font-weight: 600;
  text-decoration: none; border: 1px solid #444; color: var(--fg); background: transparent;
  font: inherit; font-weight: 600; cursor: pointer;
}
.btn.primary { background: var(--red); border-color: var(--red); color: #fff; }
.btn.primary:hover { background: var(--red-dim); border-color: var(--red-dim); }
.btn:hover { border-color: var(--red); }
.fine { color: var(--muted); font-size: 14px; }

section { border-top: 1px solid var(--line); padding: 28px 0; }
.grid { display: grid; gap: 20px; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }
.grid p { margin: 0; color: #bbb; }
.price { font-size: 34px; font-weight: 700; }

form { display: grid; gap: 12px; max-width: 420px; }
label { font-size: 14px; color: var(--muted); display: grid; gap: 4px; }
input {
  background: #1a1a1a; color: var(--fg); border: 1px solid #444; border-radius: 6px;
  padding: 10px 12px; font: inherit; width: 100%;
}
input:focus { outline: none; border-color: var(--red); }
.keybox {
  background: var(--panel); border: 1px solid var(--ok); border-radius: 8px; padding: 14px;
  font-family: ui-monospace, Menlo, monospace; font-size: 13px; word-break: break-all; margin: 12px 0;
}
.error { color: var(--red); }
footer { color: var(--muted); font-size: 14px; border-top: 1px solid var(--line); padding-top: 20px; }
footer a { color: var(--muted); }