:root {
  color-scheme: dark;
  --bg: #0b0d10;
  --surface: #14171b;
  --text: #e8eaed;
  --muted: #9aa4ad;
  --accent: #4fc1b0;
  --danger: #e0876a;
  --success: #6fbf8b;
  --warning: #d9b35b;
  --line: #262b31;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  min-height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
}

main {
  width: min(100%, 28rem);
  margin: 0 auto;
  padding: 1.1rem 1.1rem 1.5rem;
}

.brand {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin: 0 0 0.2rem;
}

.brand strong { letter-spacing: -0.02em; }

.demo {
  margin: 0 0 1rem;
  color: var(--warning);
  font-size: 0.8rem;
}

.amount {
  margin: 0;
  font-size: 2rem;
  font-weight: 650;
  letter-spacing: -0.03em;
}

.amount span {
  color: var(--muted);
  font-size: 1rem;
  font-weight: 500;
}

.status {
  margin: 0.35rem 0 1rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin: 0 0 0.9rem;
}

.chips button {
  appearance: none;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  border-radius: 999px;
  padding: 0.3rem 0.65rem;
  font: inherit;
  font-size: 0.82rem;
  cursor: pointer;
}

.chips button[aria-pressed="true"] {
  border-color: var(--accent);
  color: var(--accent);
}

.qr {
  background: #fff;
  border-radius: 12px;
  padding: 0.7rem;
  width: 220px;
  height: 220px;
  margin: 0 auto 0.9rem;
}

.qr svg {
  display: block;
  width: 100%;
  height: 100%;
}

.row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.45rem 0;
  border-top: 1px solid var(--line);
  font-size: 0.9rem;
}

.row dt { color: var(--muted); }

.row dd {
  margin: 0;
  text-align: right;
  word-break: break-all;
}

.mono { font-family: var(--mono); font-size: 0.78rem; }

.copy {
  appearance: none;
  margin-top: 0.85rem;
  width: 100%;
  border: 0;
  border-radius: 8px;
  background: var(--accent);
  color: #06110f;
  font: inherit;
  font-weight: 650;
  padding: 0.7rem;
  cursor: pointer;
}

.warn {
  margin: 0.8rem 0 0;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.4;
}

.empty { color: var(--danger); }