/* ── Reset ── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:'Segoe UI',Inter,system-ui,sans-serif;background:#0d1117;color:#e6edf3;min-height:100vh}

/* ── Top bar ── */
.topbar{
  position:sticky;top:0;z-index:100;
  display:flex;align-items:center;justify-content:space-between;
  gap:10px;padding:10px 16px;
  background:rgba(13,17,23,.92);backdrop-filter:blur(12px);
  border-bottom:1px solid #21262d;
}
.topbar-left{display:flex;align-items:center;gap:10px;flex:1;min-width:0}
.topbar-right{display:flex;align-items:center;gap:10px;flex-shrink:0}
.logo{font-size:17px;color:#58a6ff;white-space:nowrap}
.topbar input[type="text"]{
  flex:1;max-width:420px;padding:7px 12px;
  border-radius:8px;border:1px solid #30363d;
  background:#161b22;color:#e6edf3;font-size:13px;
}
.status-text{font-size:12px;color:#8b949e;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.currency-switch{
  display:inline-flex;align-items:center;
  border:1px solid #30363d;border-radius:8px;overflow:hidden;background:#0d1117
}
.currency-btn{
  border:none;background:transparent;color:#8b949e;cursor:pointer;
  padding:7px 10px;font-size:12px;font-weight:700
}
.currency-btn + .currency-btn{border-left:1px solid #30363d}
.currency-btn.active{background:#1f6feb;color:#fff}
.currency-btn:hover{background:#21262d;color:#e6edf3}

/* ── Buttons ── */
.btn{
  display:inline-flex;align-items:center;gap:5px;
  padding:7px 14px;border-radius:8px;border:none;
  font-size:13px;font-weight:600;cursor:pointer;
  transition:background .15s,transform .1s;white-space:nowrap;
}
.btn:active{transform:scale(.97)}
.btn-primary{background:#238636;color:#fff}
.btn-primary:hover{background:#2ea043}
.btn-secondary{background:#21262d;color:#c9d1d9;border:1px solid #30363d}
.btn-secondary:hover{background:#30363d}
.btn-cart{background:#21262d;color:#c9d1d9;border:1px solid #30363d;position:relative}
.btn-cart:hover{background:#30363d}
#cart-badge{
  background:#da3633;color:#fff;font-size:11px;font-weight:700;
  padding:1px 6px;border-radius:10px;margin-left:3px;
}
.btn-icon{background:none;color:#8b949e;font-size:22px;padding:4px 8px;border:none}
.btn-icon:hover{color:#e6edf3}
.btn:disabled{opacity:.5;cursor:wait;transform:none}

/* ── Catalog list ── */
.catalog{
  padding:12px 16px;
  display:flex;flex-direction:column;gap:0;
  max-width:900px;margin:0 auto;
}
.catalog-toolbar{
  display:flex;
  align-items:center;
  gap:10px;
  padding:0 0 12px 0;
}
.catalog-toolbar #search-input{
  width:100%;
  padding:10px 12px;
  border-radius:10px;
  border:1px solid #30363d;
  background:#161b22;
  color:#e6edf3;
  font-size:13px;
  outline:none;
}
.catalog-toolbar #search-input:focus{
  border-color:#1f6feb;
  box-shadow:0 0 0 3px rgba(31,111,235,.15);
}
.catalog-empty{text-align:center;color:#8b949e;padding:80px 20px;font-size:15px}

/* ── Product row ── */
.product-row{
  display:flex;align-items:center;gap:12px;
  padding:10px 14px;
  border-bottom:1px solid #161b22;
  transition:background .12s;
}
.product-row:hover{background:#161b22}
.product-row.in-cart{background:rgba(35,134,54,.06);border-left:3px solid #238636}
.product-row:nth-child(even){background:rgba(22,27,34,.5)}
.product-row:nth-child(even):hover{background:#161b22}

.pr-info{flex:1;min-width:0}
.pr-name{font-size:14px;font-weight:600;line-height:1.3;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.pr-meta{font-size:12px;color:#8b949e;margin-top:2px;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

.pr-price{text-align:right;flex-shrink:0;min-width:90px}
.pr-price-main{font-size:15px;font-weight:700;white-space:nowrap}
.pr-price-main.price-case{color:#d29922}
.pr-price-main.price-unit{color:#58a6ff}
.pr-price-main.price-display{color:#8957e5}
.pr-price-sub{font-size:12px;color:#a371f7;white-space:nowrap;font-weight:600;opacity:.85}
.price-tbd{color:#8b949e;font-size:12px;font-weight:400;font-style:italic}

.pr-trend{flex-shrink:0;min-width:0}
.product-trend{display:inline-flex;align-items:center;gap:3px;
  font-size:11px;font-weight:600;padding:2px 7px;border-radius:6px;white-space:nowrap}
.trend-up{background:rgba(248,81,73,.12);color:#f85149}
.trend-down{background:rgba(63,185,80,.12);color:#3fb950}
.trend-new,.trend-stable{background:rgba(139,148,158,.12);color:#8b949e}
.product-trend small{font-weight:400;opacity:.85}

.pr-actions{display:flex;align-items:center;gap:6px;flex-shrink:0}
.mode-switch{
  display:inline-flex;align-items:center;
  border:1px solid #30363d;border-radius:8px;overflow:hidden;
  background:#0d1117
}
.mode-btn{
  border:none;background:transparent;color:#8b949e;cursor:pointer;
  padding:6px 10px;font-size:12px;font-weight:700;text-transform:lowercase
}
.mode-btn + .mode-btn{border-left:1px solid #30363d}
.mode-btn.active[data-mode="case"]{background:#d29922;color:#fff}
.mode-btn.active[data-mode="display"]{background:#8957e5;color:#fff}
.mode-btn.active[data-mode="unit"]{background:#1f6feb;color:#fff}
.mode-btn.active{background:#1f6feb;color:#fff}
.mode-btn:hover{background:#21262d;color:#e6edf3}

.qty-control{
  display:inline-flex;align-items:center;
  border:1px solid #30363d;border-radius:8px;overflow:hidden;
  background:#0d1117;
}
.qty-control button{
  width:30px;height:30px;border:none;background:transparent;
  color:#c9d1d9;font-size:15px;cursor:pointer;
  display:flex;align-items:center;justify-content:center;
}
.qty-control button:hover{background:#21262d}
.qty-control input{
  width:36px;height:30px;border:none;
  border-left:1px solid #30363d;border-right:1px solid #30363d;
  background:transparent;color:#e6edf3;text-align:center;font-size:13px;
  -moz-appearance:textfield;appearance:textfield;
}
.qty-control input::-webkit-inner-spin-button{-webkit-appearance:none;appearance:none}

/* ── Drawer (cart) ── */
.drawer{
  position:fixed;top:0;right:0;bottom:0;width:360px;
  background:#161b22;border-left:1px solid #21262d;
  z-index:200;display:flex;flex-direction:column;
  transform:translateX(100%);transition:transform .25s ease;
  box-shadow:-8px 0 30px rgba(0,0,0,.4);
}
.drawer.open{transform:translateX(0)}
.drawer-overlay{
  position:fixed;inset:0;z-index:199;
  background:rgba(0,0,0,.5);opacity:0;pointer-events:none;
  transition:opacity .25s;
}
.drawer-overlay.open{opacity:1;pointer-events:auto}

.drawer-header{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 16px;border-bottom:1px solid #21262d;
}
.drawer-header h2{font-size:17px;font-weight:700}

.drawer-body{flex:1;overflow-y:auto;padding:10px 16px}
.cart-empty{color:#8b949e;text-align:center;padding:40px 0;font-size:14px}

.cart-item{
  display:flex;align-items:start;gap:10px;
  padding:10px 0;border-bottom:1px solid #21262d;
}
.cart-item-info{flex:1;min-width:0}
.cart-item-name{font-size:13px;font-weight:600;margin-bottom:3px;line-height:1.3;
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.cart-item-detail{font-size:11px;color:#8b949e}
.cart-item-price{font-size:13px;font-weight:600;color:#58a6ff;white-space:nowrap}
.cart-item-remove{
  background:none;border:none;color:#f85149;cursor:pointer;
  font-size:15px;padding:2px 4px;flex-shrink:0;
}
.cart-item-remove:hover{color:#ff7b72}

/* ── Drawer footer ── */
.drawer-footer{padding:12px 16px;border-top:1px solid #21262d}
.cart-total{
  display:flex;justify-content:space-between;align-items:center;
  font-size:15px;margin-bottom:10px;
}
.cart-total strong{font-size:18px;color:#58a6ff}
.drawer-actions{display:flex;gap:8px;margin-bottom:10px}
.drawer-actions .btn{flex:1}

.wechat-preview{
  width:100%;min-height:120px;max-height:220px;resize:vertical;
  background:#0d1117;border:1px solid #30363d;border-radius:8px;
  color:#8b949e;padding:8px;font-size:11px;font-family:inherit;
}

/* ── Price changes banner ── */
#price-changes{max-width:900px;margin:0 auto;padding:8px 16px 0}
.price-changes-inner{
  display:flex;flex-wrap:wrap;gap:8px;
  padding:8px 14px;border-radius:10px;
  background:#161b22;border:1px solid #21262d;font-size:12px;
}
.pc-section{display:flex;align-items:center;gap:5px;flex-wrap:wrap}
.pc-icon{font-size:10px}
.pc-up{color:#f85149}
.pc-up strong{color:#f85149}
.pc-down{color:#3fb950}
.pc-down strong{color:#3fb950}
.pc-list{color:#8b949e;font-size:11px}
.pc-section + .pc-section{padding-left:12px;border-left:1px solid #30363d}

/* ── Responsive ── */
@media(max-width:640px){
  .topbar{flex-wrap:wrap;gap:8px;padding:8px 12px}
  .topbar-left{flex-wrap:wrap;gap:8px}
  .topbar-right{width:100%;justify-content:space-between}
  .topbar input[type="text"]{max-width:100%;font-size:13px}
  .logo{font-size:15px}
  .catalog{padding:8px 0}
  .catalog-toolbar{padding:0 12px 8px}
  .product-row{padding:10px 12px;gap:8px;flex-wrap:wrap}
  .pr-name{white-space:normal}
  .pr-price{min-width:auto}
  .pr-actions{width:100%;justify-content:space-between;margin-top:4px;flex-wrap:wrap}
  .drawer{width:100%}
  #price-changes{padding:6px 12px 0}
}