:root {
  color-scheme: light;
  --bg: #f4f6f8;
  --card: #fff;
  --text: #1a1a1a;
  --muted: #667085;
  --line: #e6e8ec;
  --blue: #1677ff;
  --ali: #1677ff;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font: 15px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
}
a { color: var(--blue); text-decoration: none; }
.wrap { max-width: 480px; margin: 0 auto; min-height: 100vh; background: var(--bg); }
header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 16px; background: #fff; border-bottom: 1px solid var(--line);
}
.brand { font-weight: 700; font-size: 16px; color: var(--text); }
nav { display: flex; gap: 14px; font-size: 14px; }
nav a { color: #344054; }
main { padding: 16px; }
.hero, .card {
  background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 16px;
}
.hero h1, .card h1 { margin: 0 0 8px; font-size: 22px; line-height: 1.35; }
.muted { color: var(--muted); font-size: 13px; }
.price { margin: 12px 0 0; font-size: 28px; font-weight: 700; color: #d4380d; }
.price span { font-size: 14px; font-weight: 600; }
.btn {
  display: block; width: 100%; margin-top: 16px; padding: 12px 16px;
  border: 0; border-radius: 10px; background: var(--blue); color: #fff;
  font: inherit; font-weight: 650; text-align: center; cursor: pointer;
}
.btn.ghost { background: #fff; color: var(--blue); border: 1px solid #91caff; }
a.btn { text-decoration: none; }
[hidden] { display: none !important; }
.btn.wx-open { background: #07c160; }
.btn.ali-open { background: var(--ali); }
ul.plain { margin: 10px 0 0; padding-left: 18px; }
ul.plain li { margin: 6px 0; }
.row { display: flex; justify-content: space-between; gap: 12px; padding: 10px 0; border-bottom: 1px solid var(--line); }
.row:last-child { border-bottom: 0; }
.amount { margin: 8px 0 4px; font-size: 36px; font-weight: 700; letter-spacing: -0.5px; }
.pay-method {
  display: flex; align-items: center; gap: 10px; margin-top: 10px;
  padding: 12px; border: 1px solid var(--line); border-radius: 10px; background: #fff;
  cursor: pointer;
}
.pay-method input { width: 16px; height: 16px; margin: 0; }
.pay-method:has(input:checked) { border-color: #91caff; background: #f0f7ff; }
.pay-method:has(input[value="wechat"]:checked) { border-color: #95de64; background: #f6ffed; }
.pay-name { flex: 1; font-weight: 650; }
.ali-mark, .wx-mark {
  width: 28px; height: 28px; border-radius: 6px; color: #fff;
  display: grid; place-items: center; font-weight: 700; flex: 0 0 auto;
}
.ali-mark { background: var(--ali); }
.wx-mark { background: #07c160; }
.reward-code { margin: 4px 0 0; font-size: 20px; letter-spacing: 0.04em; font-weight: 700; word-break: break-all; }
.lookup { display: flex; gap: 8px; margin-top: 10px; }
.lookup input { flex: 1; height: 36px; border: 1px solid var(--line); border-radius: 8px; padding: 0 10px; }
.qr-box { margin-top: 12px; text-align: center; }
.qr-box img { width: 220px; height: 220px; background: #fff; border-radius: 8px; }
footer { padding: 8px 16px 28px; color: var(--muted); font-size: 12px; line-height: 1.7; }
footer a { color: var(--muted); }