:root{
  --blue:#0d5cb6; --blue2:#0a4a94; --orange:#f5820b; --red:#e0322b;
  --bg:#f2f4f7; --card:#fff; --line:#e3e7ee; --txt:#20262e; --muted:#6b7684;
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:'Segoe UI',Roboto,Arial,sans-serif;color:var(--txt);background:var(--bg);line-height:1.45}
a{text-decoration:none;color:inherit}
.container{max-width:1200px;margin:0 auto;padding:0 14px}

/* topbar */
.topbar{background:#0b1c33;color:#c8d6e8;font-size:12.5px}
.topbar-inner{display:flex;justify-content:space-between;align-items:center;height:34px;flex-wrap:wrap;gap:8px}
.topbar-left{display:flex;gap:18px;flex-wrap:wrap}
.topbar-right b{color:#fff}

/* header */
.header{background:linear-gradient(90deg,var(--blue),var(--blue2));color:#fff}
.header-inner{display:flex;align-items:center;gap:20px;height:74px}
.logo{display:flex;align-items:center;gap:9px;font-weight:800;font-size:21px;color:#fff;letter-spacing:.5px}
.logo-mark{background:var(--orange);color:#fff;border-radius:8px;padding:5px 9px;font-size:18px;letter-spacing:0}
.logo-text{display:flex;flex-direction:column;line-height:1}
.logo-text em{font-style:normal;color:#ffd27a;font-size:12.5px;letter-spacing:3px;font-weight:700;margin-top:2px}
.searchbox{flex:1;display:flex;background:#fff;border-radius:24px;overflow:hidden;max-width:560px}
.searchbox input{flex:1;border:0;outline:0;padding:11px 18px;font-size:14px}
.searchbox button{border:0;background:#fff;padding:0 16px;font-size:16px;cursor:pointer;color:var(--blue)}
.header-actions{display:flex;align-items:center;gap:16px;margin-left:auto}
.hotline{display:flex;flex-direction:column;line-height:1.15}
.hotline small{font-size:11.5px;opacity:.85}
.hotline b{font-size:16px}
.cart-btn{background:#fff;color:var(--blue);border:0;border-radius:24px;padding:9px 16px;font-weight:700;font-size:14px;cursor:pointer;display:flex;align-items:center;gap:6px}
.cart-count{background:var(--red);color:#fff;border-radius:20px;min-width:20px;height:20px;display:inline-flex;align-items:center;justify-content:center;font-size:12px;padding:0 5px}

/* mainnav */
.mainnav{background:var(--blue2)}
.mainnav-inner{display:flex;gap:2px;flex-wrap:wrap}
.mainnav a{color:#fff;padding:12px 15px;font-size:13.5px;font-weight:600;display:inline-block}
.mainnav a:hover,.mainnav a.active{background:var(--orange)}

/* banner */
.banner{background:linear-gradient(120deg,#e8f1fd,#dbeafe);border-radius:12px;margin:16px 0;padding:26px 28px;display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap}
.banner h1{font-size:24px;color:var(--blue2)}
.banner p{color:#4a5768;margin-top:6px;font-size:14px}
.banner-off{background:var(--orange);color:#fff;border-radius:12px;padding:14px 22px;text-align:center;font-size:15px}
.banner-off b{font-size:26px}
.banner-off small{font-size:12px;opacity:.95}

/* layout */
.layout{display:grid;grid-template-columns:260px 1fr;gap:18px;padding:8px 14px 40px;align-items:start}
.crumb{font-size:13px;color:var(--muted);margin-bottom:12px}
.crumb a{color:var(--blue)}

/* sidebar */
.fbox{background:#fff;border:1px solid var(--line);border-radius:10px;margin-bottom:14px;overflow:hidden}
.fbox h3{font-size:13px;background:#f7f9fc;padding:11px 14px;border-bottom:1px solid var(--line);color:var(--blue2);letter-spacing:.3px}
.fbox ul{list-style:none;padding:6px 0}
.fbox li{padding:8px 14px;font-size:13.5px;color:#3c4655;cursor:pointer;display:flex;justify-content:space-between;gap:8px}
.fbox li:hover{background:#f2f7ff;color:var(--blue)}
.fbox li.active{color:var(--blue);font-weight:700;background:#eaf2ff}
.fbox li small{color:var(--muted)}

/* toolbar */
.toolbar{display:flex;justify-content:space-between;align-items:center;background:#fff;border:1px solid var(--line);border-radius:10px;padding:10px 14px;margin-bottom:14px;flex-wrap:wrap;gap:8px}
.result-count{font-size:13.5px;color:var(--muted)}
.sort{display:flex;align-items:center;gap:8px;font-size:13.5px}
.sort select{padding:7px 10px;border:1px solid var(--line);border-radius:8px;font-size:13.5px;background:#fff}

/* grid */
.grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}
.card{background:var(--card);border:1px solid var(--line);border-radius:11px;overflow:hidden;display:flex;flex-direction:column;transition:.15s}
.card:hover{box-shadow:0 6px 18px rgba(13,92,182,.14);transform:translateY(-2px);border-color:#c9dcf5}
.card-img{aspect-ratio:1/1;background:#fff;display:flex;align-items:center;justify-content:center;padding:8px;cursor:pointer}
.card-img img{max-width:100%;max-height:100%;object-fit:contain}
.card-body{padding:10px 12px 14px;display:flex;flex-direction:column;gap:7px;flex:1}
.promo{font-size:11.5px;color:var(--red);background:#fff5f4;border:1px dashed #ffd0cc;border-radius:6px;padding:4px 8px}
.promo b{font-weight:700}
.card-name{font-size:13.5px;font-weight:600;color:#243043;min-height:38px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;cursor:pointer}
.card-name:hover{color:var(--blue)}
.spec{font-size:11.5px;color:var(--muted);min-height:16px}
.card-foot{margin-top:auto;display:flex;justify-content:space-between;align-items:center;gap:8px}
.price{font-size:16px;font-weight:800;color:var(--red)}
.price small{font-weight:400;color:var(--muted);text-decoration:line-through;font-size:11.5px;margin-left:5px}
.add{border:0;background:var(--blue);color:#fff;border-radius:8px;padding:7px 11px;font-size:12.5px;font-weight:700;cursor:pointer;white-space:nowrap}
.add:hover{background:var(--orange)}
.badge{position:absolute;margin:8px;background:var(--red);color:#fff;font-size:10.5px;padding:2px 7px;border-radius:5px;font-weight:700}
.card-imgwrap{position:relative}

/* footer */
.footer{background:#0b1c33;color:#c8d6e8;margin-top:20px}
.footer-inner{display:grid;grid-template-columns:1.3fr 1fr;gap:24px;padding:30px 14px;font-size:13.5px}
.footer h4{color:#fff;margin-bottom:10px;font-size:15px}
.footer p{margin:4px 0;opacity:.9}
.copyright{text-align:center;padding:14px;font-size:12.5px;background:#081426;color:#7f92ab}

/* cart drawer */
.overlay{position:fixed;inset:0;background:rgba(10,20,35,.5);opacity:0;pointer-events:none;transition:.2s;z-index:40}
.overlay.show{opacity:1;pointer-events:auto}
.cart{position:fixed;top:0;right:0;height:100%;width:400px;max-width:92vw;background:#fff;z-index:50;transform:translateX(105%);transition:.25s;display:flex;flex-direction:column;box-shadow:-8px 0 30px rgba(0,0,0,.2)}
.cart.show{transform:none}
.cart-head{display:flex;justify-content:space-between;align-items:center;padding:16px;border-bottom:1px solid var(--line);font-size:16px}
.cart-head button{border:0;background:#f1f4f8;border-radius:8px;width:30px;height:30px;cursor:pointer;font-size:15px}
.cart-body{flex:1;overflow:auto;padding:10px 16px}
.ci{display:flex;gap:10px;padding:12px 0;border-bottom:1px solid var(--line)}
.ci img{width:64px;height:64px;object-fit:contain;border:1px solid var(--line);border-radius:8px;background:#fff}
.ci-info{flex:1;font-size:13px}
.ci-info .n{font-weight:600;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.ci-info .p{color:var(--red);font-weight:700;margin-top:3px}
.qty{display:flex;align-items:center;gap:8px;margin-top:6px}
.qty button{width:24px;height:24px;border:1px solid var(--line);background:#fff;border-radius:6px;cursor:pointer;font-size:14px;line-height:1}
.qty span{min-width:22px;text-align:center;font-size:13.5px}
.ci-del{border:0;background:none;color:#b04;cursor:pointer;font-size:12.5px;margin-top:6px}
.cart-empty{text-align:center;color:var(--muted);padding:50px 10px;font-size:14px}
.cart-foot{border-top:1px solid var(--line);padding:14px 16px}
.cart-total{display:flex;justify-content:space-between;font-size:15px;margin-bottom:10px}
.cart-total b{color:var(--red);font-size:19px}
.btn-primary{width:100%;border:0;background:var(--orange);color:#fff;border-radius:9px;padding:12px;font-size:15px;font-weight:700;cursor:pointer}
.btn-primary:hover{background:#db7308}
.btn-ghost{width:100%;border:1px solid var(--line);background:#fff;color:#556;border-radius:9px;padding:9px;font-size:13.5px;margin-top:8px;cursor:pointer}

/* modal */
.modal{position:fixed;inset:0;background:rgba(10,20,35,.55);display:none;align-items:flex-start;justify-content:center;z-index:60;padding:40px 14px;overflow:auto}
.modal.show{display:flex}
.modal-box{background:#fff;border-radius:12px;max-width:460px;width:100%;padding:22px;position:relative}
.modal-close{position:absolute;top:12px;right:12px;border:0;background:#f1f4f8;border-radius:8px;width:30px;height:30px;cursor:pointer}
.modal-box h3{color:var(--blue2);margin-bottom:12px}
.order-summary{background:#f7f9fc;border-radius:9px;padding:12px;font-size:13px;margin-bottom:14px;max-height:180px;overflow:auto}
.order-summary .r{display:flex;justify-content:space-between;padding:3px 0}
.form{display:flex;flex-direction:column;gap:10px}
.form input,.form textarea{border:1px solid var(--line);border-radius:9px;padding:11px 13px;font-size:14px;font-family:inherit;outline:0}
.form input:focus,.form textarea:focus{border-color:var(--blue)}
.form textarea{min-height:64px;resize:vertical}
.cod{font-size:13.5px;display:flex;gap:8px;align-items:center}
.order-msg{margin-top:10px;font-size:14px;font-weight:600}
.order-msg.ok{color:#17864a}
.order-msg.err{color:var(--red)}
.empty{grid-column:1/-1;text-align:center;color:var(--muted);padding:60px 0}

@media(max-width:960px){
  .grid{grid-template-columns:repeat(3,1fr)}
  .layout{grid-template-columns:1fr}
  .sidebar{order:2}
  .header-inner{flex-wrap:wrap;height:auto;padding:12px 0}
  .searchbox{order:3;max-width:none;width:100%}
}
@media(max-width:600px){
  .grid{grid-template-columns:repeat(2,1fr)}
  .topbar-left span:nth-child(n+3){display:none}
}