:root{
    --bg:#0B0D0F;
    --surface:#14171A;
    --surface-2:#1B1F23;
    --line:#262B30;
    --text:#EDEFF1;
    --text-dim:#8A9199;
    --accent:#4DFFB4;
    --accent-dim:#2A9C74;
    --warn:#FF6B57;
    --radius:2px;
  }
  *{box-sizing:border-box; margin:0; padding:0;}
  html{scroll-behavior:smooth;}
  body{
    background:var(--bg);
    color:var(--text);
    font-family:'Inter', sans-serif;
    line-height:1.5;
    -webkit-font-smoothing:antialiased;
  }
  ::selection{background:var(--accent); color:#000;}
  a{color:inherit; text-decoration:none;}
  .mono{font-family:'JetBrains Mono', monospace;}
  .display{font-family:'Space Grotesk', sans-serif;}

  /* focus visibility */
  a:focus-visible, button:focus-visible, input:focus-visible{
    outline:2px solid var(--accent);
    outline-offset:2px;
  }

  @media (prefers-reduced-motion: reduce){
    *{animation:none !important; transition:none !important;}
  }

  /* ---------- topbar ---------- */
  .topbar{
    position:sticky; top:0; z-index:50;
    background:rgba(11,13,15,0.88);
    backdrop-filter:blur(10px);
    border-bottom:1px solid var(--line);
  }
  .topbar-inner{
    max-width:1280px; margin:0 auto;
    padding:16px 24px;
    display:flex; align-items:center; justify-content:space-between;
    gap:24px;
  }
  .logo{
    font-family:'Space Grotesk', sans-serif;
    font-weight:700; font-size:20px;
    letter-spacing:0.02em;
    display:flex; align-items:center; gap:8px;
  }
  .logo .dot{
    width:8px; height:8px; border-radius:50%;
    background:var(--accent);
    box-shadow:0 0 12px var(--accent);
  }
  .nav-links{
    display:flex; gap:28px;
    font-size:13px;
    font-family:'JetBrains Mono', monospace;
    text-transform:uppercase;
    letter-spacing:0.06em;
    color:var(--text-dim);
  }
  .nav-links a{transition:color .15s;}
  .nav-links a:hover{color:var(--accent);}
  .cart-btn{
    display:flex; align-items:center; gap:8px;
    background:var(--surface);
    border:1px solid var(--line);
    padding:9px 14px;
    border-radius:var(--radius);
    font-family:'JetBrains Mono', monospace;
    font-size:13px;
    cursor:pointer;
    color:var(--text);
    transition:border-color .15s;
  }
  .cart-btn:hover{border-color:var(--accent);}
  .cart-count{
    background:var(--accent);
    color:#000;
    font-weight:700;
    padding:1px 6px;
    border-radius:10px;
    font-size:11px;
    min-width:18px;
    text-align:center;
  }

  /* ---------- hero ---------- */
  .hero{
    max-width:1280px; margin:0 auto;
    padding:100px 24px 80px;
    display:grid;
    grid-template-columns:1.2fr 1fr;
    gap:48px;
    align-items:end;
    border-bottom:1px solid var(--line);
  }
  .hero-eyebrow{
    font-family:'JetBrains Mono', monospace;
    font-size:12px;
    color:var(--accent);
    letter-spacing:0.12em;
    text-transform:uppercase;
    margin-bottom:20px;
    display:flex; align-items:center; gap:10px;
  }
  .hero-eyebrow::before{
    content:'';
    width:24px; height:1px;
    background:var(--accent);
  }
  .hero h1{
    font-family:'Space Grotesk', sans-serif;
    font-size:clamp(40px, 6vw, 76px);
    font-weight:700;
    line-height:0.98;
    letter-spacing:-0.02em;
  }
  .hero h1 .outline{
    -webkit-text-stroke:1.5px var(--text);
    color:transparent;
  }
  .hero-sub{
    font-size:15px;
    color:var(--text-dim);
    max-width:380px;
    padding-bottom:8px;
  }
  .hero-stats{
    display:flex; gap:0;
    margin-top:28px;
    border-top:1px solid var(--line);
  }
  .hero-stat{
    padding:14px 20px 0 0;
    margin-right:20px;
  }
  .hero-stat .n{
    font-family:'JetBrains Mono', monospace;
    font-size:22px; font-weight:600;
    color:var(--accent);
  }
  .hero-stat .l{
    font-size:11px; color:var(--text-dim);
    text-transform:uppercase; letter-spacing:0.06em;
    margin-top:2px;
  }

  /* ---------- category rail ---------- */
  .rail{
    max-width:1280px; margin:0 auto;
    padding:20px 24px;
    display:flex; gap:10px; flex-wrap:wrap;
    border-bottom:1px solid var(--line);
    position:sticky; top:65px; z-index:40;
    background:var(--bg);
  }
  .chip{
    font-family:'JetBrains Mono', monospace;
    font-size:12px;
    padding:8px 14px;
    border:1px solid var(--line);
    border-radius:20px;
    cursor:pointer;
    color:var(--text-dim);
    background:var(--surface);
    transition:all .15s;
    white-space:nowrap;
  }
  .chip:hover{color:var(--text); border-color:var(--text-dim);}
  .chip.active{
    background:var(--accent);
    color:#000;
    border-color:var(--accent);
    font-weight:600;
  }

  /* ---------- product grid ---------- */
  .catalog{
    max-width:1280px; margin:0 auto;
    padding:48px 24px 100px;
  }
  .cat-group{margin-bottom:56px;}
  .cat-group:last-child{margin-bottom:0;}
  .cat-header{
    display:flex; align-items:baseline; gap:14px;
    margin-bottom:20px;
    padding-bottom:12px;
    border-bottom:1px solid var(--line);
  }
  .cat-header h2{
    font-family:'Space Grotesk', sans-serif;
    font-size:22px; font-weight:600;
  }
  .cat-header .count{
    font-family:'JetBrains Mono', monospace;
    font-size:12px;
    color:var(--text-dim);
  }
  .grid{
    display:grid;
    grid-template-columns:repeat(auto-fill, minmax(220px, 1fr));
    gap:1px;
    background:var(--line);
    border:1px solid var(--line);
  }
  .card{
    background:var(--bg);
    padding:20px;
    display:flex; flex-direction:column;
    gap:12px;
    transition:background .15s;
    position:relative;
  }
  .card:hover{background:var(--surface);}
  .card-visual{
    aspect-ratio:1;
    background:var(--surface-2);
    border:1px solid var(--line);
    display:flex; align-items:center; justify-content:center;
    font-size:32px;
    position:relative;
    overflow:hidden;
  }
  .card-visual::after{
    content:'';
    position:absolute; inset:0;
    background:radial-gradient(circle at 30% 20%, rgba(77,255,180,0.08), transparent 60%);
  }
  .stock-tag{
    position:absolute; top:8px; right:8px;
    font-family:'JetBrains Mono', monospace;
    font-size:9px;
    padding:3px 6px;
    background:rgba(11,13,15,0.85);
    color:var(--accent);
    text-transform:uppercase;
    letter-spacing:0.04em;
    z-index:1;
  }
  .stock-tag.low{color:var(--warn);}
  .card-name{
    font-size:14px; font-weight:600;
    line-height:1.3;
  }
  .card-spec{
    font-family:'JetBrains Mono', monospace;
    font-size:11px;
    color:var(--text-dim);
  }
  .card-bottom{
    display:flex; align-items:center; justify-content:space-between;
    margin-top:auto;
    padding-top:8px;
  }
  .price{
    font-family:'JetBrains Mono', monospace;
    font-size:16px; font-weight:600;
    color:var(--accent);
  }
  .add-btn{
    font-family:'JetBrains Mono', monospace;
    font-size:11px;
    text-transform:uppercase;
    letter-spacing:0.04em;
    background:transparent;
    border:1px solid var(--text-dim);
    color:var(--text);
    padding:7px 12px;
    cursor:pointer;
    transition:all .15s;
  }
  .add-btn:hover{border-color:var(--accent); color:var(--accent);}
  .add-btn.added{
    background:var(--accent); color:#000; border-color:var(--accent);
  }

  /* ---------- cart drawer ---------- */
  .overlay{
    position:fixed; inset:0;
    background:rgba(0,0,0,0.6);
    z-index:90;
    opacity:0; pointer-events:none;
    transition:opacity .2s;
  }
  .overlay.open{opacity:1; pointer-events:all;}
  .drawer{
    position:fixed; top:0; right:0; bottom:0;
    width:420px; max-width:92vw;
    background:var(--surface);
    border-left:1px solid var(--line);
    z-index:91;
    display:flex; flex-direction:column;
    transform:translateX(100%);
    transition:transform .25s ease;
  }
  .drawer.open{transform:translateX(0);}
  .drawer-head{
    padding:22px 24px;
    border-bottom:1px solid var(--line);
    display:flex; align-items:center; justify-content:space-between;
  }
  .drawer-head h3{
    font-family:'Space Grotesk', sans-serif;
    font-size:18px; font-weight:600;
  }
  .close-btn{
    background:none; border:none; color:var(--text-dim);
    font-size:22px; cursor:pointer; line-height:1;
  }
  .close-btn:hover{color:var(--text);}
  .drawer-items{
    flex:1; overflow-y:auto;
    padding:16px 24px;
  }
  .empty-cart{
    color:var(--text-dim);
    font-size:13px;
    text-align:center;
    padding:60px 20px;
  }
  .drawer-item{
    display:flex; gap:12px;
    padding:14px 0;
    border-bottom:1px solid var(--line);
  }
  .drawer-item .thumb{
    width:56px; height:56px;
    background:var(--surface-2);
    border:1px solid var(--line);
    display:flex; align-items:center; justify-content:center;
    font-size:20px;
    flex-shrink:0;
  }
  .drawer-item-info{flex:1; min-width:0;}
  .drawer-item-info .name{font-size:13px; font-weight:600; margin-bottom:4px;}
  .drawer-item-info .price{font-size:13px;}
  .qty-row{
    display:flex; align-items:center; gap:10px;
    margin-top:8px;
  }
  .qty-btn{
    width:22px; height:22px;
    background:var(--surface-2);
    border:1px solid var(--line);
    color:var(--text);
    cursor:pointer;
    font-family:'JetBrains Mono', monospace;
    font-size:13px;
    display:flex; align-items:center; justify-content:center;
  }
  .qty-btn:hover{border-color:var(--accent);}
  .qty-val{font-family:'JetBrains Mono', monospace; font-size:13px; min-width:16px; text-align:center;}
  .remove-link{
    font-family:'JetBrains Mono', monospace;
    font-size:11px;
    color:var(--warn);
    cursor:pointer;
    margin-left:auto;
  }
  .drawer-foot{
    border-top:1px solid var(--line);
    padding:20px 24px 24px;
  }
  .total-row{
    display:flex; justify-content:space-between;
    font-family:'JetBrains Mono', monospace;
    font-size:14px;
    margin-bottom:4px;
    color:var(--text-dim);
  }
  .total-row.grand{
    font-size:18px; font-weight:600;
    color:var(--text);
    margin-top:10px;
    padding-top:10px;
    border-top:1px solid var(--line);
  }
  .total-row.grand .price{color:var(--accent); font-size:18px;}
  .checkout-btn{
    width:100%;
    margin-top:16px;
    background:var(--accent);
    color:#000;
    border:none;
    padding:15px;
    font-family:'JetBrains Mono', monospace;
    font-weight:700;
    font-size:13px;
    text-transform:uppercase;
    letter-spacing:0.06em;
    cursor:pointer;
    transition:filter .15s;
  }
  .checkout-btn:hover{filter:brightness(1.1);}
  .checkout-btn:disabled{
    background:var(--line); color:var(--text-dim); cursor:not-allowed;
  }

  /* ---------- checkout modal ---------- */
  .modal-overlay{
    position:fixed; inset:0;
    background:rgba(0,0,0,0.75);
    z-index:95;
    display:none;
    align-items:center; justify-content:center;
    padding:20px;
  }
  .modal-overlay.open{display:flex;}
  .modal{
    background:var(--surface);
    border:1px solid var(--line);
    width:460px; max-width:100%;
    max-height:88vh;
    overflow-y:auto;
  }
  .modal-head{
    padding:24px;
    border-bottom:1px solid var(--line);
    display:flex; justify-content:space-between; align-items:center;
  }
  .modal-head h3{font-family:'Space Grotesk', sans-serif; font-size:19px;}
  .modal-body{padding:24px;}
  .field{margin-bottom:16px;}
  .field label{
    display:block;
    font-family:'JetBrains Mono', monospace;
    font-size:11px;
    text-transform:uppercase;
    letter-spacing:0.05em;
    color:var(--text-dim);
    margin-bottom:6px;
  }
  .field input{
    width:100%;
    background:var(--bg);
    border:1px solid var(--line);
    color:var(--text);
    padding:11px 12px;
    font-family:'Inter', sans-serif;
    font-size:14px;
  }
  .field input:focus{border-color:var(--accent); outline:none;}
  .field-row{display:flex; gap:12px;}
  .field-row .field{flex:1;}
  .modal-summary{
    background:var(--bg);
    border:1px solid var(--line);
    padding:14px 16px;
    margin-bottom:20px;
    font-family:'JetBrains Mono', monospace;
    font-size:13px;
  }
  .modal-summary-row{display:flex; justify-content:space-between; padding:3px 0; color:var(--text-dim);}
  .modal-summary-row.grand{color:var(--accent); font-weight:600; font-size:15px; padding-top:8px; margin-top:6px; border-top:1px solid var(--line);}
  .place-order-btn{
    width:100%;
    background:var(--accent); color:#000; border:none;
    padding:15px;
    font-family:'JetBrains Mono', monospace;
    font-weight:700; font-size:13px;
    text-transform:uppercase; letter-spacing:0.06em;
    cursor:pointer;
  }
  .place-order-btn:hover{filter:brightness(1.1);}
  .success-view{text-align:center; padding:20px 4px;}
  .success-icon{
    width:56px; height:56px;
    border:1.5px solid var(--accent);
    border-radius:50%;
    display:flex; align-items:center; justify-content:center;
    margin:0 auto 20px;
    font-size:24px;
    color:var(--accent);
  }
  .success-view h3{font-family:'Space Grotesk', sans-serif; font-size:20px; margin-bottom:8px;}
  .success-view p{color:var(--text-dim); font-size:13px; margin-bottom:20px;}
  .order-id{
    font-family:'JetBrains Mono', monospace;
    background:var(--bg);
    border:1px solid var(--line);
    padding:10px;
    font-size:13px;
    color:var(--accent);
    margin-bottom:20px;
  }
  .continue-btn{
    background:transparent; border:1px solid var(--line); color:var(--text);
    padding:12px 20px;
    font-family:'JetBrains Mono', monospace; font-size:12px;
    text-transform:uppercase; cursor:pointer;
  }
  .continue-btn:hover{border-color:var(--accent);}

  /* ---------- footer ---------- */
  footer{
    border-top:1px solid var(--line);
    padding:32px 24px;
    max-width:1280px; margin:0 auto;
    display:flex; justify-content:space-between; align-items:center;
    font-family:'JetBrains Mono', monospace;
    font-size:12px;
    color:var(--text-dim);
  }

  @media (max-width:800px){
    .hero{grid-template-columns:1fr; gap:24px; padding-top:80px;}
    .nav-links{display:none;}
    .rail{top:57px;}
    footer{flex-direction:column; gap:8px; text-align:center;}
  }