:root{
  --bg:#f6f7fb;
  --panel:#ffffff;
  --card:#ffffff;
  --text:#0f172a;
  --muted:#64748b;
  --line:#e5e7eb;

  --primary:#16a34a;
  --primaryText:#ffffff;

  --danger:#dc2626;
  --dangerBg:#fee2e2;

  --shadow: 0 10px 25px rgba(2,6,23,.08);
  --r:16px;
}

*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:"Noto Sans TC", system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Apple Color Emoji","Segoe UI Emoji";
  background:var(--bg);
  color:var(--text);
}

.app{
  min-height:100vh;
  display:flex;
  flex-direction:column;
}

.topbar{
  position:sticky;
  top:0;
  z-index:5;
  background:var(--panel);
  border-bottom:1px solid var(--line);
  padding:12px 16px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
}

.brand{display:flex;align-items:center;gap:12px}
.logo{
  width:44px;height:44px;border-radius:12px;
  display:flex;align-items:center;justify-content:center;
  background:#f1f5f9;
  border:1px solid var(--line);
}
.brandText{display:flex;flex-direction:column}
.brandName{font-weight:800;font-size:18px;line-height:1}
.brandSub{font-size:12px;color:var(--muted);margin-top:4px}

.topActions{display:flex;align-items:center;gap:10px}

.storeSelectWrap{
  display:flex;align-items:center;gap:8px;
  padding:8px 10px;border:1px solid var(--line);
  border-radius:12px;background:#fff;
}
.storeLabel{font-size:12px;color:var(--muted)}
.storeSelect{
  border:none;outline:none;background:transparent;
  font-size:14px;font-weight:700;color:var(--text);
}

.chip{
  border:1px solid var(--line);
  background:#fff;
  color:var(--text);
  padding:10px 12px;
  border-radius:12px;
  font-weight:700;
  cursor:pointer;
}
.chip:active{transform:translateY(1px)}

.cartBtn{
  border:1px solid var(--line);
  background:#fff;
  padding:10px 12px;
  border-radius:12px;
  display:flex;
  align-items:center;
  gap:10px;
  cursor:pointer;
  box-shadow:0 6px 16px rgba(2,6,23,.06);
}
.cartMeta{display:flex;flex-direction:column;align-items:flex-end;line-height:1}
.cartCount{font-weight:800}
.cartTotal{font-size:12px;color:var(--muted)}

.content{
  flex:1;
  display:grid;
  grid-template-columns: 260px 1fr;
  gap:16px;
  padding:16px;
}

.sidebar{
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:var(--r);
  box-shadow:var(--shadow);
  padding:14px;
}

.tabs{
  display:flex;
  gap:10px;
  margin-bottom:12px;
}
.tab{
  flex:1;
  padding:12px 10px;
  border-radius:14px;
  border:1px solid var(--line);
  background:#fff;
  font-weight:800;
  cursor:pointer;
}
.tab.isActive{
  border-color:rgba(22,163,74,.35);
  background:#f0fdf4;
}
.tab.isDisabled{
  opacity:.45;
  cursor:not-allowed;
}

.categoryTitle{
  font-weight:900;
  margin:10px 0 10px;
}
.categoryList{display:flex;flex-direction:column;gap:8px}

.cat{
  display:flex;align-items:center;justify-content:space-between;
  padding:12px 12px;
  border-radius:14px;
  background:#fff;
  border:1px solid var(--line);
  cursor:pointer;
  font-weight:700;
}
.cat small{color:var(--muted);font-weight:700}
.cat.isActive{
  border-color:rgba(22,163,74,.35);
  background:#f0fdf4;
}

.panel{
  background:var(--panel);
  border:1px solid var(--line);
  border-radius:var(--r);
  box-shadow:var(--shadow);
  padding:14px;
}

.panelHeader{
  display:flex;
  align-items:center;
  justify-content:space-between;
  margin-bottom:12px;
}
.panelTitle{font-weight:900;font-size:18px}

.grid{
  display:grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap:12px;
}

.card{
  background:var(--card);
  border:1px solid var(--line);
  border-radius:18px;
  padding:14px;
  box-shadow:0 8px 18px rgba(2,6,23,.05);
  display:flex;
  flex-direction:column;
  gap:10px;
}
.cardTitle{font-weight:900;font-size:16px}
.cardDesc{font-size:12px;color:var(--muted);margin-top:4px}
.cardBottom{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  margin-top:auto;
}
.price{font-weight:900;font-size:18px}

.btn{
  border:none;
  padding:12px 14px;
  border-radius:14px;
  font-weight:900;
  cursor:pointer;
}
.primary{
  background:var(--primary);
  color:var(--primaryText);
}
.primary:active{transform:translateY(1px)}
.wide{width:100%}

.footer{
  position:sticky;
  bottom:0;
  background:var(--panel);
  border-top:1px solid var(--line);
  padding:12px 16px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:12px;
}
.kbd{color:var(--muted);font-size:12px;display:flex;gap:8px;align-items:center}
.dot{opacity:.6}

.modalBackdrop, .drawerBackdrop{
  position:fixed;
  inset:0;
  background:rgba(2,6,23,.45);
  display:flex;
  align-items:center;
  justify-content:center;
  z-index:20;
  padding:14px;
}
.modal{
  width:min(820px, 100%);
  background:#fff;
  border:1px solid var(--line);
  border-radius:22px;
  box-shadow:0 30px 70px rgba(2,6,23,.25);
  overflow:hidden;
}
.modal.modalSm{
  width:min(520px, 100%);
}
.modalTop{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 14px;
  border-bottom:1px solid var(--line);
}
.modalTitle{font-weight:950;font-size:18px}
.modalSub{color:var(--muted);font-size:12px;margin-top:4px}
.modalTitleWrap{display:flex;flex-direction:column}
.iconBtn{
  border:1px solid var(--line);
  background:#fff;
  border-radius:12px;
  padding:10px 12px;
  cursor:pointer;
  font-weight:900;
}
.modalBody{padding:14px; max-height:60vh; overflow:auto}
.modalBottom{
  border-top:1px solid var(--line);
  padding:12px 14px;
}
.priceLine{
  display:flex;align-items:center;justify-content:space-between;
  gap:12px;margin-bottom:10px;
}
.qty{display:flex;align-items:center;gap:10px}
.qtyBtn{
  width:44px;height:44px;border-radius:14px;
  border:1px solid var(--line);
  background:#fff;
  font-size:18px;font-weight:900;
  cursor:pointer;
}
.qtyVal{min-width:20px;text-align:center;font-weight:900;font-size:16px}
.priceSum{text-align:right}
.priceLabel{color:var(--muted);font-size:12px}
.priceValue{font-weight:950;font-size:18px}

.block{
  border:1px solid var(--line);
  border-radius:18px;
  padding:12px;
  margin-bottom:12px;
  background:#fff;
}
.blockTitle{
  display:flex;align-items:flex-end;justify-content:space-between;
  gap:10px;
  font-weight:950;
  margin-bottom:8px;
}
.blockTitle small{color:var(--muted);font-weight:800}
.options{display:flex;flex-direction:column;gap:10px}

.opt{
  display:flex;align-items:center;justify-content:space-between;
  gap:12px;
  border:1px solid var(--line);
  border-radius:16px;
  padding:12px;
  cursor:pointer;
  background:#fff;
}
.optLeft{display:flex;flex-direction:column;gap:4px}
.optName{font-weight:900}
.optDesc{font-size:12px;color:var(--muted)}
.optRight{display:flex;align-items:center;gap:10px}
.optPrice{font-weight:900;color:#0f172a}
.switch{
  width:42px;height:26px;border-radius:999px;
  background:#e5e7eb; position:relative;
}
.switch::after{
  content:"";
  position:absolute; top:3px; left:3px;
  width:20px;height:20px;border-radius:999px;
  background:#fff;
  box-shadow:0 6px 14px rgba(2,6,23,.15);
  transition:all .15s ease;
}
.switch.on{background:rgba(22,163,74,.35)}
.switch.on::after{left:19px}

.drawer{
  width:min(420px, 100%);
  height:100%;
  margin-left:auto;
  background:#fff;
  border-left:1px solid var(--line);
  box-shadow:-20px 0 60px rgba(2,6,23,.25);
  display:flex;
  flex-direction:column;
}
.drawerTop{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 14px;
  border-bottom:1px solid var(--line);
}
.drawerTitle{font-weight:950;font-size:18px}
.drawerBody{padding:14px; overflow:auto; flex:1}
.drawerBottom{
  border-top:1px solid var(--line);
  padding:12px 14px;
}
.summaryRow{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}
.summaryLabel{color:var(--muted);font-weight:900}
.summaryValue{font-weight:950;font-size:18px}
.drawerActions{display:flex;gap:10px}
.ghost{
  flex:1;
  border:1px solid var(--line);
  background:#fff;
  border-radius:14px;
  padding:12px 14px;
  font-weight:950;
  cursor:pointer;
}
.drawerActions .primary{flex:1}

.cartItem{
  border:1px solid var(--line);
  border-radius:18px;
  padding:12px;
  background:#fff;
  margin-bottom:10px;
}
.cartTop{display:flex;align-items:flex-start;justify-content:space-between;gap:10px}
.cartName{font-weight:950}
.cartMetaLine{color:var(--muted);font-size:12px;margin-top:6px;line-height:1.35}
.cartPrice{font-weight:950}
.cartBottom{display:flex;align-items:center;justify-content:space-between;margin-top:10px}
.qtyMini{display:flex;align-items:center;gap:8px}
.qtyBtnMini{
  width:38px;height:38px;border-radius:14px;
  border:1px solid var(--line);
  background:#fff;font-weight:950;font-size:16px;cursor:pointer;
}
.qtyValMini{min-width:18px;text-align:center;font-weight:950}

.smallBtn{
  border:1px solid var(--line);
  background:#fff;
  border-radius:14px;
  padding:10px 12px;
  font-weight:950;
  cursor:pointer;
}
.smallBtn.danger{
  border-color:rgba(220,38,38,.35);
  background:var(--dangerBg);
  color:var(--danger);
}

.empty{
  padding:16px;
  border:1px dashed var(--line);
  border-radius:16px;
  color:var(--muted);
  background:#fff;
}

/* Checkout form */
.formGrid{display:grid; gap:12px}
.field{display:block}
.fieldLabel{font-weight:900;margin-bottom:6px}
.input{
  width:100%;
  border:1px solid var(--line);
  border-radius:14px;
  padding:12px 12px;
  font-size:14px;
  outline:none;
  background:#fff;
}
.input:focus{border-color:rgba(22,163,74,.45)}
.fieldHint{font-size:12px;color:var(--muted);margin-top:6px}

.miniSummary{
  margin-top:12px;
  border:1px solid var(--line);
  border-radius:16px;
  padding:12px;
  background:#fff;
}
.miniRow{display:flex;justify-content:space-between;align-items:center;margin:6px 0}
.miniKey{color:var(--muted);font-weight:800}
.miniVal{font-weight:950}

.warn{
  margin-top:12px;
  border:1px solid rgba(220,38,38,.35);
  background:var(--dangerBg);
  color:var(--danger);
  border-radius:14px;
  padding:10px 12px;
  font-weight:900;
  white-space:pre-wrap;
}

@media (max-width: 900px){
  .content{grid-template-columns: 1fr; }
  .grid{grid-template-columns: 1fr;}
}

[hidden] { display: none !important; }