/* =========================================================
   收银台 · iOS 风格
   ========================================================= */
:root{
  --primary:#007aff;
  --wechat:#07c160;
  --alipay:#1677ff;
  --gray:#f2f2f7;
  --ink:#1c1c1e;
  --sub:#8e8e93;
  --line:#e5e5ea;
}
*{box-sizing:border-box}
html,body{margin:0}
body{
  background:var(--gray);
  color:var(--ink);
  font-family:-apple-system,BlinkMacSystemFont,"SF Pro Text","Segoe UI","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  font-size:14px;
  line-height:1.6;
  min-height:100vh;
  padding-bottom:110px;
  -webkit-font-smoothing:antialiased;
}
.container{max-width:576px;margin:0 auto;padding:26px 20px 10px}
.head{text-align:center;margin-bottom:20px}
.head h1{
  font-size:clamp(1.4rem,4vw,1.8rem);
  font-weight:600;margin:0 0 7px;letter-spacing:-.4px;
}
.head p{margin:0;font-size:13px;color:var(--sub)}

.card{
  background:rgba(255,255,255,.88);
  -webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
  border-radius:18px;
  box-shadow:0 4px 20px rgba(0,0,0,.06);
  overflow:hidden;
  margin-bottom:20px;
}
.tabs{display:flex;border-bottom:1px solid #e6e6eb}
.tab{
  flex:1;display:flex;align-items:center;justify-content:center;gap:7px;
  padding:15px 8px;border:0;background:transparent;cursor:pointer;
  font-size:15px;color:var(--ink);font-family:inherit;
  border-bottom:2px solid transparent;margin-bottom:-1px;
  transition:color .2s;
}
.tab svg{width:19px;height:19px}
.tab[data-tab="wechat"] svg{color:var(--wechat)}
.tab[data-tab="alipay"] svg{color:var(--alipay)}
.tab.active{color:var(--primary);border-bottom-color:var(--primary);font-weight:600}
.tab.active svg{color:var(--primary)}

.pane{padding:20px}
.qr-box{
  background:#fff;border-radius:16px;padding:14px;
  box-shadow:0 4px 20px rgba(0,0,0,.06);
  display:flex;align-items:center;justify-content:center;
  margin-bottom:14px;min-height:220px;position:relative;
}
.qr-box img{width:100%;max-width:300px;height:auto;border-radius:12px;object-fit:contain;display:none}
.qr-box img.show{display:block}
.qr-empty{
  position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  color:#b6bbc4;font-size:12.5px;background:
    repeating-linear-gradient(45deg,#fafafa,#fafafa 8px,#f4f5f7 8px,#f4f5f7 16px);
  border-radius:16px;
}
.tip{text-align:center;font-size:13px;color:var(--sub);margin:0 0 4px}
.note{text-align:center;font-size:13px;font-weight:500;color:var(--wechat);margin:0}
#paneAlipay .note{color:var(--alipay)}

.foot{text-align:center;font-size:13px;color:var(--sub);padding:8px 0 26px}

.pay-bar{position:fixed;left:0;bottom:0;width:100%;padding:14px 20px 22px;background:linear-gradient(180deg,rgba(242,242,247,0),rgba(242,242,247,.96) 34%);z-index:40}
.pay-bar__inner{max-width:576px;margin:0 auto}
.pay-other{
  display:flex;align-items:center;justify-content:center;gap:8px;
  width:100%;padding:15px 16px;border-radius:13px;
  background:linear-gradient(135deg,#007aff,#3490ff);
  color:#fff;text-decoration:none;font-size:16px;font-weight:500;
  box-shadow:0 6px 18px rgba(0,122,255,.28);
  transition:all .25s ease;
}
.pay-other:active{background:linear-gradient(135deg,#0062cc,#297ee8);transform:scale(.98)}
.pay-other svg{width:18px;height:18px}

.modal{
  position:fixed;inset:0;z-index:50;display:none;
  align-items:center;justify-content:center;padding:18px;
  background:rgba(0,0,0,.45);
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
}
.modal.show{display:flex;animation:fade .18s}
@keyframes fade{from{opacity:0}to{opacity:1}}
.modal__box{
  background:#fff;width:100%;max-width:400px;border-radius:18px;overflow:hidden;
  box-shadow:0 20px 50px rgba(0,0,0,.24);
  animation:pop .22s cubic-bezier(.2,.9,.3,1.2);
}
@keyframes pop{from{transform:scale(.95);opacity:0}to{transform:none;opacity:1}}
.modal__head{padding:22px 22px 18px}
.modal__head h2{font-size:17px;font-weight:600;text-align:center;margin:0 0 16px}
.modal__list{display:grid;gap:12px}
.modal__item{display:flex;gap:9px;font-size:13px;color:var(--sub);line-height:1.7}
.modal__item svg{width:15px;height:15px;flex:0 0 15px;color:var(--primary);margin-top:3px}
.modal__item b{color:var(--primary);font-weight:600}
.modal__foot{border-top:1px solid #f0f0f3}
.modal__foot button{
  width:100%;padding:15px;border:0;background:transparent;cursor:pointer;
  font-size:16px;color:var(--primary);font-family:inherit;font-weight:500;
}
.modal__foot button:active{background:#f7f7fa}

@media (max-width:520px){
  .container{padding:18px 16px 8px}
  .pane{padding:16px}
  .qr-box{min-height:200px;padding:10px}
  .pay-bar{padding:12px 16px 18px}
  .tab{font-size:14px;padding:13px 6px}
}