:root{
    --blueprint:#12293b;
    --blueprint-line:rgba(255,255,255,0.14);
    --brass:#b8834a;
    --brass-light:#d9a96a;
    --paper:#f6f3ec;
    --card:#ffffff;
    --ink:#1c2321;
    --ink-soft:#4a5651;
    --rule:#ded8c8;
    --ok:#3e7d5a;
  }
  *{box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  body{
    margin:0;
    background:var(--paper);
    color:var(--ink);
    font-family:"IBM Plex Sans",Arial,sans-serif;
    line-height:1.55;
  }
  h1,h2,h3,h4{font-family:"Fraunces",Georgia,serif;}
  .kb-wrap{max-width:980px;margin:0 auto;padding:0 22px;}
  .mono{font-family:"IBM Plex Mono",monospace;}

  .kb-reveal{opacity:0;transform:translateY(14px);transition:opacity .55s ease, transform .55s ease;}
  .kb-reveal.in{opacity:1;transform:translateY(0);}

  .kb-hero{
    position:relative;
    background-color:var(--blueprint);
    background-image:
      linear-gradient(var(--blueprint-line) 1px, transparent 1px),
      linear-gradient(90deg, var(--blueprint-line) 1px, transparent 1px);
    background-size:36px 36px;
    color:#fff;
    overflow:hidden;
    padding:56px 0 46px;
  }
  .kb-hero::after{
    content:"";
    position:absolute;
    inset:0;
    background:radial-gradient(ellipse at 70% 30%, rgba(184,131,74,0.18), transparent 60%);
    pointer-events:none;
  }
  .kb-hero-inner{
    position:relative;
    display:grid;
    grid-template-columns:1.15fr 0.85fr;
    gap:36px;
    align-items:center;
  }
  .kb-tag{
    font-family:"IBM Plex Mono",monospace;
    font-size:13.2px;
    letter-spacing:.16em;
    text-transform:uppercase;
    color:var(--brass-light);
    border:1px solid rgba(217,169,106,0.45);
    display:inline-block;
    padding:5px 11px;
    border-radius:3px;
    margin-bottom:18px;
  }
  .kb-hero h1{
    font-size:clamp(28px,4vw,40px);
    font-weight:600;
    line-height:1.16;
    margin:0 0 16px;
    color:#fff;
  }
  .kb-hero h1 em{font-style:normal;color:var(--brass-light);}
  .kb-hero p.lede{color:#d3dde2;font-size:18.4px;max-width:520px;margin:0 0 26px;}
  .kb-hero-facts{
    display:grid;
    grid-template-columns:repeat(3,auto);
    gap:0;
    border-top:1px solid var(--blueprint-line);
    padding-top:18px;
    max-width:520px;
  }
  .kb-hero-facts div{padding-right:18px;}
  .kb-hero-facts .num{
    font-family:"IBM Plex Mono",monospace;
    font-size:25.3px;font-weight:700;color:var(--brass-light);display:block;
  }
  .kb-hero-facts .lbl{font-size:13.2px;color:#aebcc2;text-transform:uppercase;letter-spacing:.05em;}

  .kb-cylinder{display:flex;justify-content:center;align-items:center;}
  .kb-cylinder svg{width:100%;max-width:260px;height:auto;}
  .kb-cylinder svg .rot{transform-origin:110px 110px;animation:kbspin 18s linear infinite;}
  @keyframes kbspin{from{transform:rotate(0deg);}to{transform:rotate(360deg);}}
  @media (prefers-reduced-motion: reduce){
    .kb-cylinder svg .rot{animation:none;}
    html{scroll-behavior:auto;}
    .kb-reveal{opacity:1;transform:none;transition:none;}
  }

  .kb-stickynav{
    position:sticky;top:0;z-index:40;
    background:rgba(246,243,236,0.92);
    backdrop-filter:blur(6px);
    border-bottom:1px solid var(--rule);
  }
  .kb-stickynav-inner{
    display:flex;align-items:center;gap:14px;
    padding:10px 22px;
    max-width:980px;margin:0 auto;
    overflow-x:auto;
    scrollbar-width:none;
  }
  .kb-stickynav-inner::-webkit-scrollbar{display:none;}
  .kb-stickynav a{
    font-family:"IBM Plex Mono",monospace;
    font-size:13.8px;
    color:var(--ink-soft);
    text-decoration:none;
    white-space:nowrap;
    padding:6px 10px;
    border-radius:999px;
    border:1px solid transparent;
  }
  .kb-stickynav a.active{
    color:var(--blueprint);
    background:#fff;
    border-color:var(--rule);
    font-weight:600;
  }
  .kb-stickynav a:hover{color:var(--brass);}

  .kb-protocol{padding:52px 0 10px;}
  .kb-section-eyebrow{
    font-family:"IBM Plex Mono",monospace;font-size:13.2px;letter-spacing:.16em;
    text-transform:uppercase;color:var(--brass);margin:0 0 8px;display:block;
  }
  .kb-section-title{font-size:29.9px;font-weight:600;margin:0 0 30px;color:var(--blueprint);}
  .kb-protocol-strip{
    background:var(--card);border:1px solid var(--rule);border-radius:4px;
    display:grid;grid-template-columns:repeat(4,1fr);
  }
  .kb-protocol-strip .step{
    padding:24px 20px;border-right:1px solid var(--rule);position:relative;
    transition:background .25s ease;
  }
  .kb-protocol-strip .step:hover{background:#fbf9f4;}
  .kb-protocol-strip .step:last-child{border-right:none;}
  .kb-protocol-strip .code{font-family:"IBM Plex Mono",monospace;font-size:12.6px;color:var(--brass);letter-spacing:.08em;display:block;margin-bottom:10px;}
  .kb-protocol-strip h3{margin:0 0 6px;font-size:18.4px;color:var(--blueprint);font-weight:600;}
  .kb-protocol-strip p{margin:0;font-size:15.5px;color:var(--ink-soft);}

  .kb-calc{padding:52px 0 10px;}
  .kb-calc-card{
    background:var(--card);border:1px solid var(--rule);border-radius:6px;
    padding:28px;
    display:grid;grid-template-columns:1.1fr 0.9fr;gap:30px;
  }
  .kb-calc-controls label{
    display:block;font-size:14.4px;color:var(--ink-soft);margin-bottom:8px;
    text-transform:uppercase;letter-spacing:.05em;font-family:"IBM Plex Mono",monospace;
  }
  .kb-calc-row{margin-bottom:22px;}
  .kb-calc-row input[type=range]{
    width:100%;accent-color:var(--brass);height:4px;
  }
  .kb-calc-value{
    font-family:"IBM Plex Mono",monospace;font-weight:700;color:var(--blueprint);font-size:17.2px;
  }
  .kb-toggle{display:flex;gap:8px;}
  .kb-toggle button{
    flex:1;padding:10px 12px;border-radius:4px;border:1px solid var(--rule);
    background:var(--paper);font-family:"IBM Plex Sans",sans-serif;font-size:15.5px;
    cursor:pointer;color:var(--ink);transition:all .25s cubic-bezier(.2,.8,.2,1);
  }
  .kb-toggle button:hover{border-color:var(--blueprint);transform:translateY(-1px);}
  .kb-toggle button.active{background:var(--blueprint);color:#fff;border-color:var(--blueprint);box-shadow:0 4px 12px rgba(0,0,0,.15);}
  .kb-calc-result{
    background:var(--paper);
    border-radius:6px;
    padding:20px 22px;
    display:flex;flex-direction:column;justify-content:center;
    border:1px dashed var(--brass);
    transition:box-shadow .3s ease;
  }
  .kb-calc-result:hover{box-shadow:0 8px 24px rgba(0,0,0,.08);}
  .kb-calc-result .lbl{font-size:13.8px;text-transform:uppercase;letter-spacing:.06em;color:var(--ink-soft);font-family:"IBM Plex Mono",monospace;}
  .kb-calc-result .big{
    font-family:"IBM Plex Mono",monospace;font-weight:700;font-size:46px;color:var(--ok);
    margin:6px 0 4px;line-height:1;transition:transform .2s ease;
  }
  .kb-calc-result .sub{font-size:14.9px;color:var(--ink-soft);}
  .kb-bar{height:8px;background:var(--rule);border-radius:99px;overflow:hidden;margin-top:16px;position:relative;}
  .kb-bar-fill{height:100%;background:linear-gradient(90deg,var(--brass),var(--ok));width:0%;transition:width .6s cubic-bezier(.2,.8,.2,1);position:relative;}
  .kb-bar-fill::after{content:"";position:absolute;top:0;right:0;bottom:0;width:20px;background:linear-gradient(90deg,transparent,rgba(255,255,255,.4));}

  .kb-brands{padding:56px 0 20px;}
  .kb-toolbar{
    display:flex;gap:12px;align-items:center;flex-wrap:wrap;
    margin:0 0 22px;
  }
  .kb-search{
    flex:1;min-width:220px;position:relative;
  }
  .kb-search input{
    width:100%;padding:11px 14px 11px 36px;
    border:1px solid var(--rule);border-radius:4px;
    font-family:"IBM Plex Sans",sans-serif;font-size:16.1px;
    background:var(--card);color:var(--ink);
  }
  .kb-search input:focus{outline:2px solid var(--brass);outline-offset:1px;}
  .kb-search::before{
    content:"⌕";position:absolute;left:12px;top:50%;transform:translateY(-50%);
    color:var(--ink-soft);font-size:17.2px;
  }
  .kb-count{
    font-family:"IBM Plex Mono",monospace;font-size:13.8px;color:var(--ink-soft);white-space:nowrap;
  }
  .kb-no-results{
    display:none;text-align:center;padding:30px;color:var(--ink-soft);font-size:16.1px;
  }

  .kb-sheet{
    background:var(--card);border:1px solid var(--rule);border-radius:4px;
    margin-bottom:14px;scroll-margin-top:70px;overflow:hidden;
    transition:border-color .2s ease, box-shadow .2s ease;
  }
  .kb-sheet:hover{border-color:#c9c2ac;}
  .kb-sheet-head{
    display:flex;align-items:center;justify-content:space-between;gap:16px;
    padding:16px 20px;cursor:pointer;user-select:none;background:none;border:none;width:100%;
    text-align:left;font:inherit;color:inherit;
  }
  .kb-sheet-head-left{display:flex;align-items:center;gap:14px;}
  .kb-sheet-head img.logo{height:28px;width:auto;max-width:100px;object-fit:contain;}
  .kb-sheet-head h3{margin:0;font-size:20.7px;color:var(--blueprint);font-weight:600;}
  .kb-sheet-head-right{display:flex;align-items:center;gap:12px;}
  .kb-sheet-head .ref{font-family:"IBM Plex Mono",monospace;font-size:12.6px;color:#9aa5a1;letter-spacing:.04em;}
  .kb-chevron{
    width:20px;height:20px;flex:none;
    border:1px solid var(--rule);border-radius:50%;
    display:flex;align-items:center;justify-content:center;
    transition:transform .3s ease;color:var(--brass);font-size:12.6px;
  }
  .kb-sheet.open .kb-chevron{transform:rotate(180deg);}

  .kb-sheet-body-wrap{
    display:grid;grid-template-rows:0fr;
    transition:grid-template-rows .35s ease;
  }
  .kb-sheet.open .kb-sheet-body-wrap{grid-template-rows:1fr;}
  .kb-sheet-body-inner{overflow:hidden;}
  .kb-sheet-body{
    display:grid;grid-template-columns:130px 1fr;gap:22px;
    padding:0 20px 22px;border-top:1px solid var(--rule);margin-top:0;
  }
  .kb-sheet-body{padding-top:20px;}
  .kb-sheet-body img.photo{
    width:100%;height:100px;object-fit:cover;border-radius:3px;
    border:1px solid var(--rule);filter:grayscale(15%);
  }
  .kb-price-list{list-style:none;margin:0;padding:0;}
  .kb-price-list li{
    display:flex;justify-content:space-between;align-items:baseline;gap:14px;
    padding:8px 0;border-bottom:1px dotted var(--rule);
    flex-wrap:wrap;
  }
  .kb-price-list li:last-child{border-bottom:none;}
  .kb-price-list .model{font-size:16.7px;color:var(--ink);flex:1 1 160px;}
  .kb-price-list .price{font-family:"IBM Plex Mono",monospace;font-weight:600;font-size:16.7px;color:var(--blueprint);white-space:nowrap;text-align:right;}
  .price .vat, td.price .vat{
    font-family:"IBM Plex Sans",sans-serif;
    font-weight:400;
    font-size:12.1px;
    color:var(--ink-soft);
    white-space:nowrap;
    display:block;
    text-align:right;
    margin-top:1px;
  }
  .kb-note{margin-top:12px;font-size:14.4px;color:var(--ink-soft);border-left:2px solid var(--brass);padding:6px 12px;}
  .kb-oem-block{margin-top:16px;background:var(--paper);border:1px dashed var(--brass);border-radius:4px;padding:16px 18px;}
  .kb-oem-block h4{margin:0 0 8px;font-size:16.1px;color:var(--blueprint);font-family:"IBM Plex Sans",sans-serif;font-weight:600;}
  .kb-oem-block ul{margin:0 0 10px;padding-left:16px;font-size:14.9px;color:var(--ink-soft);}
  .kb-oem-block .price{font-family:"IBM Plex Mono",monospace;font-weight:700;color:var(--brass);font-size:17.2px;}
  .kb-more{text-align:center;font-size:15.5px;color:var(--ink-soft);margin-top:6px;}

  .kb-extras{padding:14px 0 50px;}
  table.kb-table{width:100%;border-collapse:collapse;background:var(--card);border:1px solid var(--rule);border-radius:4px;overflow:hidden;}
  table.kb-table th,table.kb-table td{padding:13px 18px;text-align:left;font-size:16.1px;border-bottom:1px solid var(--rule);}
  table.kb-table th{background:var(--blueprint);color:#fff;font-family:"IBM Plex Mono",monospace;font-size:13.2px;letter-spacing:.08em;text-transform:uppercase;font-weight:600;}
  table.kb-table tr:last-child td{border-bottom:none;}
  table.kb-table td.price{font-family:"IBM Plex Mono",monospace;font-weight:600;color:var(--blueprint);}

  .kb-cta{background:var(--blueprint);color:#fff;padding:54px 0;}
  .kb-cta-inner{display:grid;grid-template-columns:auto 1fr;gap:36px;align-items:center;}
  .kb-seal{
    width:118px;height:118px;border:2px solid var(--brass-light);border-radius:50%;
    display:flex;flex-direction:column;align-items:center;justify-content:center;
    text-align:center;flex:none;position:relative;
  }
  .kb-seal::before{content:"";position:absolute;inset:6px;border:1px solid rgba(217,169,106,0.5);border-radius:50%;}
  .kb-seal .l1{font-family:"IBM Plex Mono",monospace;font-size:10.9px;letter-spacing:.1em;color:var(--brass-light);}
  .kb-seal .l2{font-family:"Fraunces",serif;font-size:17.2px;font-weight:600;color:#fff;margin:3px 0;}
  .kb-seal .l3{font-family:"IBM Plex Mono",monospace;font-size:10.9px;color:#aebcc2;}
  .kb-cta h2{margin:0 0 8px;font-size:27.6px;font-weight:600;}
  .kb-cta p{color:#cfd8df;margin:0 0 20px;font-size:17.2px;}
  .kb-cta-buttons{display:flex;gap:12px;flex-wrap:wrap;}
  .kb-btn{
    display:inline-flex;align-items:center;gap:8px;padding:12px 22px;border-radius:3px;
    font-weight:600;text-decoration:none;font-size:16.7px;font-family:"IBM Plex Sans",sans-serif;
    cursor:pointer;border:none;position:relative;
  }
  .kb-btn.primary{background:var(--brass);color:#fff;}
  .kb-btn.primary:hover{background:var(--brass-light);}
  .kb-btn.secondary{background:transparent;color:#fff;border:1px solid rgba(255,255,255,0.35);}
  .kb-btn.secondary:hover{border-color:#fff;}
  .kb-copied{
    position:absolute;top:-30px;left:50%;transform:translateX(-50%);
    background:var(--ok);color:#fff;font-size:13.2px;padding:4px 9px;border-radius:3px;
    opacity:0;transition:opacity .2s ease;pointer-events:none;white-space:nowrap;
  }
  .kb-copied.show{opacity:1;}

  .kb-faq{padding:52px 0 10px;}
  .kb-faq-list{display:flex;flex-direction:column;gap:10px;}
  .kb-faq-item{
    background:var(--card);border:1px solid var(--rule);border-radius:4px;
    padding:4px 20px;
  }
  .kb-faq-item summary{
    padding:14px 0;cursor:pointer;font-weight:600;color:var(--blueprint);
    font-size:17.2px;list-style:none;position:relative;
  }
  .kb-faq-item summary::-webkit-details-marker{display:none;}
  .kb-faq-item summary::after{
    content:"+";position:absolute;right:2px;top:12px;
    color:var(--brass);font-size:20.7px;font-weight:400;
  }
  .kb-faq-item[open] summary::after{content:"–";}
  .kb-faq-item p{margin:0 0 16px;font-size:16.1px;color:var(--ink-soft);}

  .kb-contact{padding:44px 0 56px;}
  .kb-contact-grid{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--rule);border-radius:4px;overflow:hidden;background:var(--card);}
  .kb-contact-card{padding:20px;border-right:1px solid var(--rule);}
  .kb-contact-card:last-child{border-right:none;}
  .kb-contact-card .code{font-family:"IBM Plex Mono",monospace;font-size:12.1px;color:var(--brass);letter-spacing:.08em;text-transform:uppercase;display:block;margin-bottom:8px;}
  .kb-contact-card p{margin:0;font-size:15.5px;color:var(--ink);}
  .kb-contact-card a{color:var(--blueprint);text-decoration:none;font-weight:600;}
  .kb-footer-note{text-align:center;font-size:13.8px;color:#9aa5a1;margin-top:22px;}

  .kb-top{
    position:fixed;right:20px;bottom:20px;z-index:50;
    width:42px;height:42px;border-radius:50%;
    background:var(--blueprint);color:var(--brass-light);
    border:1px solid rgba(217,169,106,0.5);
    display:flex;align-items:center;justify-content:center;
    cursor:pointer;font-size:18.4px;
    opacity:0;pointer-events:none;transform:translateY(8px);
    transition:opacity .25s ease, transform .25s ease;
  }
  .kb-top.show{opacity:1;pointer-events:auto;transform:translateY(0);}

  @media (max-width:820px){
    .kb-hero-inner{grid-template-columns:1fr;}
    .kb-cylinder{order:-1;max-width:180px;margin:0 auto 10px;}
    .kb-protocol-strip{grid-template-columns:1fr 1fr;}
    .kb-protocol-strip .step{border-bottom:1px solid var(--rule);}
    .kb-calc-card{grid-template-columns:1fr;}
    .kb-sheet-body{grid-template-columns:1fr;}
    .kb-sheet-body img.photo{height:150px;}
    .kb-cta-inner{grid-template-columns:1fr;text-align:center;}
    .kb-cta-inner .kb-seal{margin:0 auto;}
    .kb-cta-buttons{justify-content:center;}
    .kb-contact-grid{grid-template-columns:1fr 1fr;}
    .kb-contact-card{border-bottom:1px solid var(--rule);}
  }

  html.kb-a11y-mode{zoom:1.16;--ink-soft:#e2e4de;--rule:#5c614f;}
  html.kb-a11y-mode .kb-card, html.kb-a11y-mode .kb-trust-card, html.kb-a11y-mode .kb-slide, html.kb-a11y-mode .kb-faq-item{border-width:2px;}
  html.kb-a11y-mode #kbA11yToggle{zoom:1;background:var(--yellow);color:#0a0b09;border-color:var(--yellow);}

@media (prefers-reduced-motion: no-preference) {
  ::view-transition-old(root) { animation: kb-vt-out 0.25s ease-out forwards; }
  ::view-transition-new(root) { animation: kb-vt-in 0.3s ease-in forwards; }
  @keyframes kb-vt-out { to { opacity: 0; transform: translateY(-8px); } }
  @keyframes kb-vt-in { from { opacity: 0; transform: translateY(8px); } }
}