:root {
  --paper: #f3eee4;
  --ink: #171512;
  --muted: #6f685e;
  --line: #d8d0c3;
  --card: #fffdf8;
  --wechat: #07c160;
  --alipay: #1677ff;
  --danger: #b42318;
  --ok: #0f7a45;
  --shadow: 0 18px 40px rgba(23, 21, 18, 0.08);
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: "IBM Plex Sans", "Noto Sans SC", "PingFang SC", sans-serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.45;
}
a { color: inherit; }
button, input {
  font: inherit;
}
.wrap {
  width: min(760px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 64px;
}
.kicker {
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 8px;
}
h1 {
  font-size: clamp(28px, 6vw, 44px);
  letter-spacing: -0.04em;
  margin: 0 0 8px;
  font-weight: 600;
}
.lede {
  color: var(--muted);
  margin: 0 0 28px;
  max-width: 36em;
}
.grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 18px;
  align-items: start;
}
.card {
  background: var(--card);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  padding: 22px;
}
label {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 6px;
}
.field { margin-bottom: 16px; }
input[type="text"], input[type="number"] {
  width: 100%;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  padding: 12px 12px;
  border-radius: 0;
}
.row {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.btn {
  appearance: none;
  border: 0;
  background: var(--ink);
  color: var(--paper);
  padding: 12px 16px;
  cursor: pointer;
}
.btn:hover { filter: brightness(1.08); }
.btn.ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--ink);
}
.btn.wechat { background: var(--wechat); color: #fff; }
.btn.alipay { background: var(--alipay); color: #fff; }
.qr {
  display: grid;
  place-items: center;
  min-height: 280px;
  background:
    linear-gradient(#d8d0c3 1px, transparent 1px) 0 0 / 16px 16px,
    linear-gradient(90deg, #d8d0c3 1px, transparent 1px) 0 0 / 16px 16px,
    #fffdf8;
}
.qr img {
  width: 240px;
  height: 240px;
  background: #fff;
  padding: 10px;
}
.meta {
  font-size: 13px;
  color: var(--muted);
  word-break: break-all;
}
.meta b { color: var(--ink); font-weight: 600; }
.chips { display: flex; gap: 8px; margin: 12px 0; }
.chip {
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid var(--line);
  padding: 4px 8px;
}
.chip.on-wechat { border-color: var(--wechat); color: var(--ok); }
.chip.on-alipay { border-color: var(--alipay); color: var(--alipay); }
.pay-shell {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}
.pay-card {
  width: min(420px, 100%);
  background: var(--card);
  border: 1px solid var(--line);
  padding: 28px 22px 24px;
  text-align: center;
}
.amount {
  font-variant-numeric: tabular-nums;
  font-size: 42px;
  letter-spacing: -0.05em;
  margin: 8px 0 4px;
}
.amount small {
  font-size: 18px;
  margin-right: 2px;
}
.status {
  margin-top: 18px;
  color: var(--muted);
  font-size: 14px;
}
.mark {
  width: 56px;
  height: 56px;
  margin: 0 auto 12px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 28px;
}
.mark.wx { background: #e8f8ee; color: var(--wechat); }
.mark.ali { background: #e8f1ff; color: var(--alipay); }
.mark.err { background: #fdecea; color: var(--danger); }
.mark.ok { background: #e8f8ee; color: var(--ok); }
.error { color: var(--danger); }
.link {
  display: inline-block;
  margin-top: 18px;
  font-size: 13px;
  color: var(--muted);
}
.banner {
  border: 1px solid var(--line);
  padding: 12px 14px;
  margin: 0 0 22px;
  font-size: 14px;
}
.banner.bad {
  border-color: #e8c4bf;
  background: #fdecea;
  color: var(--danger);
}
.banner.ok {
  border-color: #bfe3cc;
  background: #e8f8ee;
  color: var(--ok);
}
@media (max-width: 720px) {
  .grid { grid-template-columns: 1fr; }
  .wrap { padding-top: 20px; }
}
@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; animation: none !important; }
}