:root{
  --bg:#0a0a0a;
  --panel:#141414;
  --card:#1a1a1a;
  --line:#2a2a2a;
  --text:#f5f5f5;
  --muted:#9a9a9a;
  --accent:#c8ff00;
  --accent-dim:#9ccc00;
  --danger:#ff4d4f;
  --radius:16px;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;padding:0}
body{
  background:var(--bg);color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang TC","Microsoft JhengHei",Roboto,sans-serif;
  -webkit-font-smoothing:antialiased;
}
#app{max-width:480px;margin:0 auto;min-height:100vh;position:relative;padding-bottom:76px}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
.hidden{display:none!important}

/* ---------- top bar ---------- */
.topbar{
  position:sticky;top:0;z-index:50;background:rgba(10,10,10,.92);backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);padding:14px 16px;display:flex;align-items:center;gap:12px;
}
.topbar .brand{font-size:18px;font-weight:800;letter-spacing:1px;white-space:nowrap}
.topbar .brand .dot{color:var(--accent)}
.topbar .cart-btn{position:relative;margin-left:auto;font-size:22px;line-height:1}
.topbar .cart-badge{
  position:absolute;top:-6px;right:-8px;background:var(--accent);color:#000;font-size:11px;font-weight:800;
  min-width:18px;height:18px;border-radius:9px;display:flex;align-items:center;justify-content:center;padding:0 4px;
}
.back-btn{font-size:22px;line-height:1;cursor:pointer;background:none;border:none;color:var(--text)}

/* ---------- search ---------- */
.search{display:flex;gap:10px;padding:12px 16px}
.search input{
  flex:1;background:var(--panel);border:1px solid var(--line);border-radius:12px;color:var(--text);
  padding:12px 14px;font-size:15px;outline:none;
}
.search input:focus{border-color:var(--accent-dim)}
.search button{
  background:var(--accent);color:#000;border:none;border-radius:12px;padding:0 20px;font-weight:800;font-size:15px;
}

/* ---------- product grid ---------- */
.grid{display:grid;grid-template-columns:repeat(2,1fr);gap:12px;padding:4px 12px 12px}
.card{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  display:flex;flex-direction:column;transition:transform .15s;
}
.card:active{transform:scale(.98)}
.card .thumb{aspect-ratio:1/1;background:#222;overflow:hidden}
.card .thumb img{width:100%;height:100%;object-fit:cover}
.card .body{padding:10px 12px 12px}
.card .name{font-size:13px;line-height:1.4;color:var(--text);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;min-height:36px}
.card .model{font-size:11px;color:var(--muted);margin-top:3px}
.card .price{font-size:16px;font-weight:800;color:var(--accent);margin-top:8px}
.price small{font-size:11px;color:var(--muted);font-weight:600}

/* ---------- page padding ---------- */
.page{padding:0 16px 24px}
.section-title{font-size:16px;font-weight:800;margin:16px 0 10px;letter-spacing:.5px}

/* ---------- detail ---------- */
.carousel{position:relative;background:#111}
.carousel .track{display:flex;overflow-x:auto;scroll-snap-type:x mandatory;scrollbar-width:none}
.carousel .track::-webkit-scrollbar{display:none}
.carousel .slide{flex:0 0 100%;scroll-snap-align:start;aspect-ratio:1/1}
.carousel .slide img{width:100%;height:100%;object-fit:cover}
.carousel .counter{
  position:absolute;bottom:12px;right:12px;background:rgba(0,0,0,.65);color:#fff;font-size:12px;
  padding:4px 10px;border-radius:12px;
}
.detail-body{padding:18px 16px 30px}
.detail-body .name{font-size:19px;font-weight:800;line-height:1.4}
.detail-body .model{color:var(--muted);font-size:13px;margin-top:6px}
.detail-body .price{font-size:26px;font-weight:900;color:var(--accent);margin-top:12px}
.opt-group{margin-top:20px}
.opt-group .lbl{font-size:13px;color:var(--muted);margin-bottom:10px;font-weight:700}
.opts{display:flex;flex-wrap:wrap;gap:8px}
.opt{
  min-width:52px;padding:10px 12px;text-align:center;border:1.5px solid var(--line);border-radius:10px;
  font-size:14px;cursor:pointer;background:var(--panel);color:var(--text);font-weight:600;
}
.opt.active{border-color:var(--accent);color:var(--accent);background:rgba(200,255,0,.08)}
.qty-row{display:flex;align-items:center;gap:16px;margin-top:20px}
.qty-row .lbl{font-size:13px;color:var(--muted);font-weight:700;margin-right:auto}
.qty-btn{width:38px;height:38px;border:1.5px solid var(--line);background:var(--panel);color:var(--text);font-size:20px;border-radius:10px;cursor:pointer;line-height:1}
.qty-val{font-size:18px;font-weight:800;min-width:34px;text-align:center}
.desc-block{margin-top:24px;padding-top:18px;border-top:1px solid var(--line)}
.desc-block h4{font-size:14px;font-weight:800;margin:0 0 10px}
.desc-block .desc{font-size:13.5px;line-height:1.7;color:#cfcfcf;white-space:pre-wrap;word-break:break-word}
.cod-note{margin-top:18px;background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:14px;font-size:13px;color:#cfcfcf;line-height:1.6}

/* ---------- bottom action bar ---------- */
.actionbar{
  position:fixed;bottom:0;left:0;right:0;z-index:60;background:rgba(10,10,10,.95);backdrop-filter:blur(10px);
  border-top:1px solid var(--line);max-width:480px;margin:0 auto;padding:12px 16px calc(12px + env(safe-area-inset-bottom));
  display:flex;gap:10px;
}
.btn{
  border:none;border-radius:12px;font-weight:800;font-size:15px;cursor:pointer;padding:15px 16px;text-align:center;
}
.btn-accent{background:var(--accent);color:#000;flex:1}
.btn-outline{background:transparent;color:var(--text);border:1.5px solid var(--line);flex:1}
.btn-dark{background:var(--panel);color:var(--text);border:1.5px solid var(--line);flex:1}
.btn[disabled]{opacity:.4;pointer-events:none}

/* ---------- cart ---------- */
.cart-item{
  display:flex;gap:12px;background:var(--card);border:1px solid var(--line);border-radius:14px;padding:12px;margin-bottom:12px;
}
.cart-item img{width:76px;height:76px;object-fit:cover;border-radius:10px;background:#222}
.cart-item .info{flex:1;min-width:0}
.cart-item .iname{font-size:14px;font-weight:700;line-height:1.3}
.cart-item .iv{font-size:12px;color:var(--muted);margin-top:4px}
.cart-item .iprice{font-size:15px;font-weight:800;color:var(--accent);margin-top:6px}
.cart-item .qty{margin-left:auto;display:flex;align-items:center;gap:10px;align-self:flex-end}
.cart-item .qty button{width:30px;height:30px;border-radius:8px;border:1px solid var(--line);background:var(--panel);color:var(--text);font-size:16px}
.cart-item .rm{color:var(--muted);font-size:12px;text-align:right;cursor:pointer;margin-top:6px}
.summary{
  background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px;margin-top:14px;
}
.summary .row{display:flex;justify-content:space-between;padding:6px 0;font-size:14px}
.summary .row.total{border-top:1px solid var(--line);margin-top:8px;padding-top:12px;font-size:17px;font-weight:800}
.summary .row.total b{color:var(--accent)}

/* ---------- form ---------- */
.field{margin-bottom:14px}
.field .fl{font-size:13px;color:var(--muted);margin-bottom:6px;font-weight:700}
.field input,.field select,.field textarea{
  width:100%;background:var(--panel);border:1px solid var(--line);border-radius:12px;color:var(--text);
  padding:13px 14px;font-size:15px;outline:none;
}
.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--accent-dim)}
.field .row2{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.pay-opt{
  border:1.5px solid var(--line);border-radius:12px;padding:14px;display:flex;align-items:center;gap:10px;cursor:pointer;background:var(--panel);
}
.pay-opt.active{border-color:var(--accent);color:var(--accent)}
.pay-opt .radio{width:18px;height:18px;border-radius:50%;border:2px solid var(--muted);flex-shrink:0}
.pay-opt.active .radio{border-color:var(--accent);background:radial-gradient(circle,var(--accent) 5px,transparent 6px)}

/* ---------- success ---------- */
.success-ic{font-size:52px;text-align:center;color:var(--accent);margin:30px 0 10px}
.success-title{text-align:center;font-size:20px;font-weight:900}
.success-sub{text-align:center;color:var(--muted);font-size:13px;margin-top:6px}
.receipt{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:16px;margin-top:20px}
.receipt .row{display:flex;justify-content:space-between;padding:7px 0;font-size:14px}
.receipt .row.g{font-weight:800;border-top:1px solid var(--line);margin-top:8px;padding-top:12px}
.receipt .row.g b{color:var(--accent)}
.receipt .items{background:var(--panel);border-radius:10px;padding:12px;margin:10px 0}

/* ---------- loading & toast ---------- */
.loading{text-align:center;padding:40px;color:var(--muted);font-size:14px}
.spinner{width:28px;height:28px;border:3px solid var(--line);border-top-color:var(--accent);border-radius:50%;margin:0 auto 12px;animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
#toast{
  position:fixed;top:18px;left:50%;transform:translateX(-50%);z-index:999;background:#fff;color:#000;
  padding:11px 20px;border-radius:12px;font-size:14px;font-weight:700;box-shadow:0 6px 24px rgba(0,0,0,.4);
  opacity:0;pointer-events:none;transition:opacity .25s;max-width:88%;
}
#toast.show{opacity:1}
.empty{text-align:center;color:var(--muted);padding:60px 20px;font-size:14px}
.empty .big{font-size:40px;margin-bottom:12px}
.loadmore{text-align:center;padding:16px}
.loadmore button{background:var(--panel);border:1px solid var(--line);color:var(--text);border-radius:12px;padding:12px 28px;font-size:14px;cursor:pointer}