:root{
    --bg: #000000;
    --bg-grid: rgba(176,176,176,0.05);
    --surface: #141414;
    --surface-2: #1e1e1e;
    --cyan: #ffffff;
    --violet: #b0b0b0;
    --amber: #e0e0e0;
    --text: #f5f5f5;
    --text-muted: #999999;
    --border: rgba(176,176,176,0.16);
    --radius: 14px;
  }

  *{ box-sizing: border-box; }
  html{ scroll-behavior: smooth; }

  body{
    margin:0;
    background: var(--bg);
    background-image:
      linear-gradient(var(--bg-grid) 1px, transparent 1px),
      linear-gradient(90deg, var(--bg-grid) 1px, transparent 1px);
    background-size: 28px 28px;
    color: var(--text);
    font-family: 'IBM Plex Sans', sans-serif;
    -webkit-font-smoothing: antialiased;
  }

  h1,h2,h3{ font-family:'Space Grotesk', sans-serif; margin:0; letter-spacing:-0.01em; }
  .mono{ font-family:'IBM Plex Mono', monospace; }
  a{ color: inherit; text-decoration:none; }
  img,svg{ display:block; max-width:100%; }

  .wrap{ max-width: 1180px; margin: 0 auto; padding: 0 24px; }

  /* top compliance bar */
  .topbar{
    background: var(--surface-2);
    border-bottom: 1px solid var(--border);
    font-family:'IBM Plex Mono', monospace;
    font-size: 12px;
    letter-spacing: 0.04em;
    color: var(--amber);
  }
  .topbar .wrap{
    display:flex; justify-content:space-between; align-items:center;
    padding: 8px 24px; gap: 16px; flex-wrap: wrap;
  }
  .topbar span.muted{ color: var(--text-muted); }

  /* navigation */
  nav{
    position: sticky; top:0; z-index: 50;
    background: rgba(0,0,0,0.85);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
  }
  nav .wrap{
    display:flex; align-items:center; justify-content:space-between;
    padding: 16px 24px;
  }
  .logo{ display:flex; align-items:center; gap:10px; font-weight:700; font-size: 19px; }
  .logo-mark{ filter: drop-shadow(0 0 6px rgba(255,255,255,0.35)); flex-shrink:0; }
  .navlinks{ display:flex; gap: 28px; font-size: 14px; color: var(--text-muted); }
  .navlinks a:hover{ color: var(--cyan); }
  .nav-cta{
    background: var(--cyan); color:#000000; font-weight:600; font-size:13.5px;
    padding: 9px 16px; border-radius: 999px; white-space:nowrap;
  }
  .nav-icons{ display:flex; align-items:center; gap: 10px; }
  .cart-btn{
    position:relative; background:none; border: 1px solid var(--border); border-radius: 10px;
    width: 38px; height: 38px; display:flex; align-items:center; justify-content:center;
    color: var(--text); cursor:pointer;
  }
  .cart-btn:hover{ border-color: var(--cyan); color: var(--cyan); }
  .cart-count{
    position:absolute; top:-7px; right:-7px; background: var(--cyan); color:#000000;
    font-family:'IBM Plex Mono', monospace; font-size: 10.5px; font-weight:600;
    min-width: 18px; height: 18px; border-radius: 999px; display:flex; align-items:center; justify-content:center;
    padding: 0 4px; line-height:1;
  }
  @media (max-width: 680px){
    .navlinks{ display:none; }
    .nav-cta{ display:none; }
  }

  /* hero */
  .hero{ padding: 84px 0 56px; position:relative; overflow:hidden; }
  .bg-canvas{ position:fixed; inset:0; width:100vw; height:100vh; z-index:-1; pointer-events:none; }
  .eyebrow{
    font-family:'IBM Plex Mono', monospace; font-size:12px; letter-spacing:0.12em;
    color: var(--cyan); text-transform:uppercase; margin-bottom: 18px;
    display:flex; align-items:center; gap:10px;
  }
  .eyebrow::before{ content:''; width:24px; height:1px; background: var(--cyan); }
  .hero h1{
    font-size: clamp(36px, 6vw, 64px); font-weight:700; line-height: 1.04; max-width: 820px;
  }
  .hero h1 .accent{ color: var(--cyan); }
  .hero p.lead{
    margin-top: 22px; font-size: 17px; color: var(--text-muted); max-width: 560px; line-height:1.6;
  }
  .hero-ctas{ margin-top: 32px; display:flex; gap:14px; flex-wrap:wrap; }
  .btn-primary{
    background: var(--cyan); color:#000000; font-weight:600; padding: 13px 24px;
    border-radius: 10px; font-size: 14.5px; border:none; cursor:pointer;
  }
  .btn-ghost{
    border: 1px solid var(--border); padding: 13px 24px; border-radius:10px;
    font-size: 14.5px; color: var(--text); font-weight:500;
  }
  .btn-ghost:hover{ border-color: var(--cyan); color: var(--cyan); }

  /* ticker */
  .ticker{
    margin-top: 56px; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
    padding: 14px 0; overflow:hidden; white-space:nowrap; position:relative; z-index:1;
  }
  .ticker::before, .ticker::after{
    content:''; position:absolute; top:0; bottom:0; width:80px; z-index:2;
  }
  .ticker::before{ left:0; background: linear-gradient(90deg, var(--bg), transparent); }
  .ticker::after{ right:0; background: linear-gradient(-90deg, var(--bg), transparent); }
  .ticker-track{
    display:inline-block; font-family:'IBM Plex Mono', monospace; font-size: 13px;
    color: var(--text-muted); letter-spacing: 0.18em;
    animation: scroll-left 38s linear infinite;
  }
  .ticker-track span{ color: var(--violet); }
  @keyframes scroll-left{ from{ transform: translateX(0); } to{ transform: translateX(-50%); } }

  /* trust strip */
  .trust{ padding: 36px 0; border-bottom: 1px solid var(--border); }
  .trust-grid{ display:grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
  @media (max-width: 760px){ .trust-grid{ grid-template-columns: repeat(2,1fr); } }
  .trust-item{ display:flex; align-items:center; gap:12px; }
  .trust-item .num{ font-family:'IBM Plex Mono', monospace; color: var(--cyan); font-size: 13px; }
  .trust-item .label{ font-size: 13.5px; color: var(--text-muted); line-height:1.3; }

  /* sections */
  .section{ padding: 84px 0; }
  .section-head{ max-width: 620px; margin-bottom: 44px; }
  .section-head .eyebrow{ margin-bottom: 14px; }
  .section-head h2{ font-size: clamp(26px, 4vw, 36px); }
  .section-head p{ color: var(--text-muted); margin-top: 12px; line-height:1.6; font-size:15px; }

  /* search */
  .search-row{
    display:flex; align-items:center; gap: 10px; background: var(--surface);
    border: 1px solid var(--border); border-radius: 10px; padding: 11px 16px; margin-bottom: 20px;
    max-width: 420px;
  }
  .search-row:focus-within{ border-color: var(--cyan); }
  .search-icon{ color: var(--cyan); flex-shrink:0; filter: drop-shadow(0 0 4px rgba(255,255,255,0.3)); }
  .search-row input{
    background:none; border:none; outline:none; color: var(--text); font-size: 14px;
    font-family:'IBM Plex Sans', sans-serif; width:100%;
  }
  .search-row input::placeholder{ color: var(--text-muted); }
  .no-results{ color: var(--text-muted); font-size: 14px; padding: 32px 0; grid-column: 1 / -1; }

  /* catalog tabs */
  .cat-tabs{ display:flex; gap: 10px; margin-bottom: 32px; flex-wrap:wrap; }
  .cat-tab{
    font-family:'IBM Plex Mono', monospace; font-size: 12px; letter-spacing:0.04em;
    padding: 8px 14px; border-radius: 999px; border: 1px solid var(--border);
    color: var(--text-muted); cursor:pointer; background:none;
  }
  .cat-tab.active{ border-color: var(--cyan); color: var(--cyan); }

  /* product grid */
  .product-grid{ display:grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
  @media (max-width: 760px){ .product-grid{ grid-template-columns: 1fr; } }

  .card{
    background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
    overflow:hidden; transition: border-color 0.2s;
  }
  .card:hover{ border-color: rgba(255,255,255,0.3); }
  .card-stub{
    position:relative; padding: 16px 20px; display:flex; justify-content:space-between; align-items:flex-start;
    border-bottom: 1px dashed rgba(245,245,245,0.12);
  }
  .card-stub::before, .card-stub::after{
    content:''; position:absolute; bottom:-7px; width:14px; height:14px; border-radius:50%;
    background: var(--bg);
  }
  .card-stub::before{ left:-7px; }
  .card-stub::after{ right:-7px; }
  .card-title{ font-family:'Space Grotesk', sans-serif; font-weight:600; font-size: 17px; }
  .card-cat{ font-family:'IBM Plex Mono', monospace; font-size:10.5px; color: var(--violet); letter-spacing:0.08em; margin-top:4px; }
  .ruo-tag{
    font-family:'IBM Plex Mono', monospace; font-size: 10px; color: var(--amber);
    border: 1px solid rgba(224,224,224,0.35); padding: 3px 7px; border-radius: 6px; white-space:nowrap; flex-shrink:0;
  }
  .card-body{ padding: 16px 20px 20px; }
  .card-desc{ font-size: 13px; color: var(--text-muted); line-height:1.55; }
  .card-meta{
    margin-top: 14px; display:grid; grid-template-columns: 1fr 1fr; gap: 8px 14px;
    font-family:'IBM Plex Mono', monospace; font-size: 11px;
  }
  .card-meta .k{ color: var(--text-muted); }
  .card-meta .v{ color: var(--text); word-break:break-all; }
  .card-foot{
    margin-top: 16px; display:flex; align-items:center; justify-content:space-between; gap: 10px;
    padding-top: 14px; border-top: 1px solid var(--border); flex-wrap: wrap;
  }
  .variant-select{
    background: var(--surface-2); border: 1px solid var(--border); border-radius: 8px;
    color: var(--text); font-family:'IBM Plex Mono', monospace; font-size: 12px;
    padding: 7px 10px; outline:none; cursor:pointer;
  }
  .variant-select:focus{ border-color: var(--cyan); }
  .card-price{ font-family:'Space Grotesk', sans-serif; font-weight:700; font-size: 18px; }
  .btn-add{
    background: var(--cyan); color:#000000; font-family:'IBM Plex Mono', monospace;
    font-size: 12px; font-weight:600; padding: 8px 14px; border-radius: 8px; border:none; cursor:pointer;
    white-space:nowrap; transition: opacity 0.15s;
  }
  .btn-add:hover{ opacity: 0.85; }
  .btn-add.added{ background: var(--surface-2); color: var(--text); border: 1px solid var(--border); }

  /* cart drawer */
  .cart-overlay{
    position:fixed; inset:0; background: rgba(0,0,0,0.6); backdrop-filter: blur(2px);
    opacity:0; pointer-events:none; transition: opacity 0.25s; z-index: 90;
  }
  .cart-overlay.open{ opacity:1; pointer-events:auto; }
  .cart-drawer{
    position:fixed; top:0; right:0; bottom:0; width: 380px; max-width: 92vw;
    background: var(--surface); border-left: 1px solid var(--border);
    transform: translateX(100%); transition: transform 0.3s ease; z-index: 91;
    display:flex; flex-direction:column;
  }
  .cart-drawer.open{ transform: translateX(0); }
  .cart-head{
    padding: 20px 22px; border-bottom: 1px solid var(--border);
    display:flex; align-items:center; justify-content:space-between;
  }
  .cart-head h3{ font-size: 18px; }
  .cart-close{
    background:none; border: 1px solid var(--border); border-radius:8px;
    width:32px; height:32px; color: var(--text-muted); cursor:pointer; font-size: 16px;
  }
  .cart-close:hover{ color: var(--cyan); border-color: var(--cyan); }
  .cart-items{ flex:1; overflow-y:auto; padding: 12px 22px; }
  .cart-empty{ color: var(--text-muted); font-size: 13.5px; padding: 40px 0; text-align:center; }
  .cart-item{
    display:flex; justify-content:space-between; gap: 12px; padding: 14px 0;
    border-bottom: 1px solid var(--border);
  }
  .cart-item-name{ font-family:'Space Grotesk', sans-serif; font-weight:600; font-size:13.5px; }
  .cart-item-meta{ font-size: 11.5px; color: var(--text-muted); margin-top: 3px; font-family:'IBM Plex Mono', monospace; }
  .cart-item-right{ text-align:right; flex-shrink:0; }
  .cart-item-price{ font-family:'Space Grotesk', sans-serif; font-weight:600; font-size:14px; }
  .qty-row{ display:flex; align-items:center; gap: 8px; margin-top: 6px; justify-content:flex-end; }
  .qty-btn{
    width:22px; height:22px; border-radius:6px; border: 1px solid var(--border); background:none;
    color: var(--text); cursor:pointer; font-size: 14px; line-height:1; display:flex; align-items:center; justify-content:center;
  }
  .qty-btn:hover{ border-color: var(--cyan); color: var(--cyan); }
  .qty-val{ font-family:'IBM Plex Mono', monospace; font-size:12px; min-width:16px; text-align:center; }
  .ship-nudge{
    font-family:'IBM Plex Mono', monospace; font-size: 11.5px; color: var(--text-muted);
    padding: 10px 0 4px; display:none;
  }
  .ship-nudge.show{ display:block; }
  .ship-nudge.unlocked{ color: var(--text); font-weight:600; }
  .cart-foot{ padding: 16px 22px 22px; border-top: 1px solid var(--border); }
  .cart-row{ display:flex; justify-content:space-between; font-size:13px; color: var(--text-muted); margin-bottom: 6px; }
  .cart-row.total{ font-family:'Space Grotesk', sans-serif; font-size: 18px; font-weight:700; color: var(--text); margin-bottom: 14px; }
  .cart-row.total span:first-child{ font-size:14px; font-weight:400; font-family:'IBM Plex Sans', sans-serif; }
  .btn-checkout{
    width:100%; background: var(--cyan); color:#000000; font-weight:700; font-size: 15px;
    padding: 14px; border-radius: 10px; border:none; cursor:pointer; font-family:'IBM Plex Sans', sans-serif;
    margin-bottom: 8px;
  }
  .btn-checkout:hover{ opacity: 0.9; }
  .btn-checkout-email{
    width:100%; background:none; border: 1px solid var(--border); color: var(--text); font-weight:500; font-size: 14px;
    padding: 12px; border-radius: 10px; cursor:pointer; font-family:'IBM Plex Sans', sans-serif;
  }
  .btn-checkout-email:hover{ border-color: var(--cyan); }
  .cart-note{ font-size:11px; color: var(--text-muted); text-align:center; margin-top: 10px; line-height:1.5; }

  /* about */
  .about-grid{ display:grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items:center; }
  @media (max-width: 760px){ .about-grid{ grid-template-columns: 1fr; } }
  .about-text p{ color: var(--text-muted); line-height:1.7; font-size:15px; margin: 14px 0; }
  .about-stats{ display:grid; grid-template-columns: 1fr 1fr; gap: 20px; }
  .stat-box{
    background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
    padding: 20px; text-align:center;
  }
  .stat-box .num{ font-family:'Space Grotesk', sans-serif; font-size: 32px; font-weight:700; color: var(--cyan); }
  .stat-box .lbl{ font-size: 12.5px; color: var(--text-muted); margin-top: 4px; font-family:'IBM Plex Mono', monospace; }

  /* faq */
  .faq-list{ max-width: 720px; margin: 0 auto; }
  .faq-item{ border-bottom: 1px solid var(--border); }
  .faq-q{
    display:flex; justify-content:space-between; align-items:center;
    font-family:'Space Grotesk', sans-serif; font-weight:600; font-size: 15.5px;
    cursor:pointer; user-select:none; padding: 20px 0;
  }
  .faq-icon{ font-size: 20px; color: var(--text-muted); transition: transform 0.22s; flex-shrink:0; margin-left:16px; }
  .faq-item.open .faq-icon{ transform: rotate(45deg); }
  .faq-a{
    max-height:0; overflow:hidden; transition: max-height 0.3s ease, padding 0.3s ease;
    color: var(--text-muted); font-size: 14px; line-height:1.65;
  }
  .faq-item.open .faq-a{ max-height: 400px; padding-bottom: 20px; }

  /* contact */
  .contact-grid{ display:grid; grid-template-columns: 1fr 1fr; gap: 40px; }
  @media (max-width: 760px){ .contact-grid{ grid-template-columns: 1fr; } }
  .contact-info p{ color: var(--text-muted); font-size: 14px; line-height:1.6; margin: 0 0 16px; }
  .contact-form{ display:flex; flex-direction:column; gap: 12px; }
  .contact-form input, .contact-form textarea{
    background: var(--surface); border: 1px solid var(--border); border-radius: 8px;
    padding: 12px 14px; color: var(--text); font-family:'IBM Plex Sans', sans-serif; font-size: 14px; outline:none;
    transition: border-color 0.2s;
  }
  .contact-form input:focus, .contact-form textarea:focus{ border-color: var(--cyan); }
  .contact-form input::placeholder, .contact-form textarea::placeholder{ color: var(--text-muted); }
  .contact-form textarea{ min-height: 110px; resize:vertical; }
  .contact-form .btn-primary{ align-self:flex-start; font-family:'IBM Plex Sans', sans-serif; }

  /* footer */
  footer{ border-top: 1px solid var(--border); padding: 32px 0 48px; margin-top: 20px; }
  footer .wrap{ display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap: 16px; }
  footer .muted{ color: var(--text-muted); font-size: 13px; }
  footer .footer-links{ display:flex; gap: 20px; font-size: 13px; color: var(--text-muted); flex-wrap:wrap; }
  footer .footer-links a:hover{ color: var(--cyan); }

  /* toast */
  .toast-container{
    position:fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
    z-index: 200; display:flex; flex-direction:column; gap: 8px; align-items:center;
    pointer-events:none;
  }
  .toast{
    background: var(--surface-2); border: 1px solid var(--border); border-radius: 10px;
    padding: 12px 20px; font-size: 13.5px; color: var(--text);
    box-shadow: 0 8px 24px rgba(0,0,0,0.6);
    animation: toast-in 0.25s ease;
  }
  @keyframes toast-in{ from{ opacity:0; transform: translateY(12px); } to{ opacity:1; transform: translateY(0); } }

  /* scrollbar */
  ::-webkit-scrollbar{ width: 6px; }
  ::-webkit-scrollbar-track{ background: var(--bg); }
  ::-webkit-scrollbar-thumb{ background: var(--surface-2); border-radius: 3px; }
  ::-webkit-scrollbar-thumb:hover{ background: var(--border); }


  /* research-use gate */
  #gate-overlay{
    position: fixed; inset: 0; z-index: 999;
    background: rgba(0,0,0,0.88);
    backdrop-filter: blur(6px);
    display: flex; align-items: center; justify-content: center;
    padding: 20px;
  }
  #gate-overlay[hidden]{ display:none; }
  body.gate-locked{ overflow: hidden; }
  .gate-card{
    width: 100%; max-width: 460px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: 0 0 0 1px rgba(255,255,255,0.03), 0 30px 80px rgba(0,0,0,0.6);
    padding: 36px 32px 30px;
    text-align: center;
  }
  .gate-logo{ display:flex; align-items:center; justify-content:center; gap:10px; font-weight:700; font-size: 19px; margin-bottom: 22px; }
  .gate-card h2{ font-size: 24px; line-height:1.25; margin-bottom: 16px; }
  .gate-card p{ color: var(--text-muted); font-size: 14px; line-height: 1.65; margin: 0 0 22px; }
  .gate-card p b, .gate-card p strong{ color: var(--text); }
  .gate-check{
    display:flex; align-items:flex-start; gap: 10px; text-align:left;
    background: var(--surface-2); border: 1px solid var(--border); border-radius: 10px;
    padding: 12px 14px; margin-bottom: 20px; cursor: pointer;
  }
  .gate-check input{ margin-top: 3px; accent-color: var(--cyan); width:15px; height:15px; flex-shrink:0; }
  .gate-check span{ font-size: 12.5px; color: var(--text-muted); line-height:1.55; }
  .gate-enter{
    display:block; width:100%;
    background: var(--cyan); color:#000; font-weight:600; font-size: 15px;
    font-family: 'Space Grotesk', sans-serif;
    padding: 14px 20px; border-radius: 999px; border:none; cursor: pointer;
    transition: opacity .15s ease, transform .15s ease;
  }
  .gate-enter:enabled:hover{ transform: translateY(-1px); }
  .gate-enter:disabled{ opacity: 0.35; cursor: not-allowed; }
  .gate-exit{
    display:inline-block; margin-top: 16px; font-family:'IBM Plex Mono', monospace;
    font-size: 12px; color: var(--text-muted); letter-spacing:0.03em;
    text-decoration: underline; text-underline-offset: 3px; background:none; border:none; cursor:pointer;
  }
  .gate-exit:hover{ color: var(--cyan); }

  /* shipping method selector */
  .ship-method-group{
    display:flex; flex-direction:column; gap:8px;
    margin: 4px 0 14px;
  }
  .ship-method-opt{
    display:flex; align-items:center; gap:9px;
    border: 1px solid var(--border); border-radius: 10px;
    padding: 10px 12px; cursor: pointer; font-size: 13px;
    background: var(--surface-2);
    transition: border-color .15s ease;
  }
  .ship-method-opt:has(input:checked){ border-color: var(--cyan); }
  .ship-method-opt input{ accent-color: var(--cyan); width:15px; height:15px; }