:root {
  --bg: #101114;
  --bg-2: #17181d;
  --ink: #eceadf;
  --muted: #9a9688;
  --line: #2b2d33;
  --brass: #c4a574;
  --brass-2: #e0c79a;
  --ok: #7dba7a;
  --bad: #d37a62;
}
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--ink); }
body {
  font: 16px/1.5 "Segoe UI", system-ui, sans-serif;
}
code, kbd, pre, .mono { font-family: ui-monospace, "Cascadia Code", Consolas, monospace; }
a { color: var(--brass-2); }
header, main, footer { max-width: 920px; margin: 0 auto; padding: 0 20px; }
header { padding-top: 28px; display: flex; justify-content: space-between; align-items: baseline; }
.brand { letter-spacing: 0.08em; text-transform: uppercase; font-size: 13px; color: var(--brass); }
.price { color: var(--muted); font-size: 13px; }
h1 { font-size: 42px; line-height: 1.15; font-weight: 600; margin: 28px 0 12px; letter-spacing: -0.02em; }
.lede { color: var(--muted); max-width: 40rem; }
.hero-actions { display: flex; gap: 12px; margin: 24px 0 40px; flex-wrap: wrap; }
button, .btn {
  appearance: none; border: 1px solid var(--brass);
  background: transparent; color: var(--brass-2); padding: 10px 16px;
  cursor: pointer; font: inherit; text-decoration: none; display: inline-block;
}
button.primary, .btn.primary { background: var(--brass); color: #16140f; border-color: var(--brass); }
button:disabled { opacity: 0.5; cursor: default; }
section { border-top: 1px solid var(--line); padding: 28px 0; }
h2 { font-size: 20px; font-weight: 600; margin: 0 0 12px; }
.grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 720px) { .grid { grid-template-columns: 1fr; } h1 { font-size: 32px; } }
label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 6px; }
input[type="number"], select {
  width: 100%; background: var(--bg-2); color: var(--ink);
  border: 1px solid var(--line); padding: 8px 10px; font: inherit;
}
.checks { display: flex; flex-wrap: wrap; gap: 8px 16px; }
.checks label { color: var(--ink); font-size: 14px; }
pre.out {
  background: var(--bg-2); border: 1px solid var(--line);
  padding: 14px; overflow: auto; white-space: pre-wrap;
  min-height: 180px; font-size: 13px;
}
.paybox {
  background: var(--bg-2); border: 1px solid var(--line); padding: 16px;
}
.paybox code { color: var(--brass-2); word-break: break-all; }
.status { margin-top: 10px; color: var(--muted); }
.status.paid { color: var(--ok); }
.status.err { color: var(--bad); }
footer { color: var(--muted); font-size: 13px; padding: 24px 20px 48px; }
ul.plain { padding-left: 18px; color: var(--muted); }