:root{
    --ink:#14181D;
    --paper:#EDEEEA;
    --paper-2:#E3E4DE;
    --steel:#6B7580;
    --steel-2:#9AA3AC;
    --signal:#1F8A82;
    --signal-dim:#1F8A821a;
    --amber:#C98A2E;
    --line:#14181D22;
    --line-soft:#14181D14;
    --white:#FBFAF8;
    --radius:2px;
    --display:'Space Grotesk',sans-serif;
    --body:'Inter',sans-serif;
    --mono:'IBM Plex Mono',monospace;
  }
  *{box-sizing:border-box;margin:0;padding:0;}
  html{scroll-behavior:smooth;}
  body{
    background:var(--paper);
    color:var(--ink);
    font-family:var(--body);
    font-size:16px;
    line-height:1.6;
    -webkit-font-smoothing:antialiased;
  }
  @media (prefers-reduced-motion: reduce){
    *{animation-duration:0.001ms !important; animation-iteration-count:1 !important; transition-duration:0.001ms !important; scroll-behavior:auto !important;}
  }
  a{color:inherit;}
  .wrap{max-width:1180px;margin:0 auto;padding:0 32px;}
  .eyebrow{
    font-family:var(--mono);
    font-size:11px;
    letter-spacing:.14em;
    text-transform:uppercase;
    color:var(--signal);
    display:flex;
    align-items:center;
    gap:10px;
  }
  .eyebrow::before{content:'';width:16px;height:1px;background:var(--signal);display:inline-block;}
  h1,h2,h3{font-family:var(--display);font-weight:600;letter-spacing:-0.01em;}
  ::selection{background:var(--signal);color:var(--white);}
  :focus-visible{outline:2px solid var(--signal);outline-offset:3px;}

  /* ---------- NAV ---------- */
  header{
    position:fixed;top:0;left:0;right:0;z-index:100;
    background:color-mix(in srgb, var(--paper) 88%, transparent);
    backdrop-filter:blur(10px);
    border-bottom:1px solid var(--line-soft);
  }
  .nav{display:flex;align-items:center;justify-content:space-between;height:64px;}
  .logo{font-family:var(--display);font-weight:700;font-size:19px;letter-spacing:.02em;}
  .logo span{color:var(--signal);}
  .navlinks{display:flex;gap:28px;font-size:13px;font-family:var(--mono);}
  .navlinks a{text-decoration:none;color:var(--steel);letter-spacing:.02em;transition:color .2s;}
  .navlinks a:hover{color:var(--ink);}
  .navcta{
    font-family:var(--mono);font-size:12px;letter-spacing:.05em;
    border:1px solid var(--ink);padding:9px 16px;text-decoration:none;color:var(--ink);
    transition:background .2s, color .2s;
  }
  .navcta:hover{background:var(--ink);color:var(--white);}
  @media(max-width:860px){.navlinks{display:none;}}

  /* ---------- SPINE RAIL (structural nav device) ---------- */
  .rail{
    position:fixed;left:28px;top:50%;transform:translateY(-50%);
    z-index:90;display:flex;flex-direction:column;align-items:center;gap:0;
  }
  .rail-seg{
    display:flex;align-items:center;gap:10px;padding:7px 0;position:relative;
    cursor:pointer;
  }
  .rail-dot{width:6px;height:6px;border-radius:50%;background:var(--steel-2);transition:all .25s;flex-shrink:0;}
  .rail-label{
    font-family:var(--mono);font-size:10px;color:var(--steel-2);letter-spacing:.05em;
    opacity:0;transform:translateX(-6px);transition:all .25s;white-space:nowrap;
  }
  .rail-seg:hover .rail-label, .rail-seg.active .rail-label{opacity:1;transform:translateX(0);}
  .rail-seg.active .rail-dot{background:var(--signal);width:9px;height:9px;box-shadow:0 0 0 3px var(--signal-dim);}
  .rail-line{position:absolute;left:2.5px;top:100%;width:1px;height:26px;background:var(--line);}
  @media(max-width:1024px){.rail{display:none;}}

  /* ---------- HERO ---------- */
  .hero{
    min-height:100vh;display:flex;align-items:center;
    padding-top:64px;position:relative;overflow:hidden;
  }
  .hero-grid{
    display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center;
  }
  .hero-eyebrow{margin-bottom:22px;}
  .hero h1{
    font-size:clamp(42px,6vw,74px);
    line-height:.98;
    margin-bottom:22px;
  }
  .hero h1 em{
    font-style:normal;color:var(--signal);
  }
  .hero p.lede{
    font-size:18px;color:var(--steel);max-width:460px;margin-bottom:34px;
  }
  .hero-actions{display:flex;gap:14px;align-items:center;flex-wrap:wrap;}
  .btn-primary{
    font-family:var(--mono);font-size:13px;letter-spacing:.04em;
    background:var(--ink);color:var(--white);padding:14px 26px;
    text-decoration:none;display:inline-flex;align-items:center;gap:8px;
    transition:background .2s;
  }
  .btn-primary:hover{background:var(--signal);}
  .btn-secondary{
    font-family:var(--mono);font-size:13px;letter-spacing:.04em;color:var(--ink);
    text-decoration:none;border-bottom:1px solid var(--ink);padding-bottom:2px;
  }
  .founder-tag{
    margin-top:40px;font-family:var(--mono);font-size:12px;color:var(--steel);
    border-top:1px solid var(--line);padding-top:16px;max-width:460px;
  }

  /* spine diagram */
  .spine-stage{position:relative;height:640px;display:flex;align-items:center;justify-content:center;}
  svg.spine{width:100%;height:100%;overflow:visible;}
  .vert{fill:var(--white);stroke:var(--ink);stroke-width:1.4;}
  .disc{fill:var(--paper-2);stroke:var(--line);stroke-width:1;}
  .spine-core{stroke:var(--signal);stroke-width:1.6;fill:none;opacity:.55;}
  .leader{stroke:var(--steel-2);stroke-width:1;fill:none;stroke-dasharray:2 3;}
  .leader-dot{fill:var(--signal);}
  .leader-text{font-family:var(--mono);font-size:10.5px;fill:var(--ink);letter-spacing:.02em;}
  .leader-text tspan.sub{fill:var(--steel);}
  @keyframes drift{0%,100%{transform:translateY(0);}50%{transform:translateY(-6px);}}
  .spine-group{animation:drift 7s ease-in-out infinite;transform-origin:center;}

  /* ---------- SECTION SHELL ---------- */
  section{padding:120px 0;position:relative;}
  .section-head{max-width:640px;margin-bottom:64px;}
  .section-head h2{font-size:clamp(30px,3.6vw,44px);margin:16px 0 18px;line-height:1.05;}
  .section-head p{color:var(--steel);font-size:16.5px;max-width:560px;}
  .divider{height:1px;background:var(--line);width:100%;}

  /* ---------- PHILOSOPHY ---------- */
  .philosophy{background:var(--ink);color:var(--paper);}
  .philosophy .eyebrow{color:var(--signal);}
  .philosophy .section-head p{color:#B9BEC4;}
  .principles{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:#ffffff14;border:1px solid #ffffff1c;}
  .principle{background:var(--ink);padding:34px 26px;min-height:220px;display:flex;flex-direction:column;justify-content:space-between;}
  .principle .pnum{font-family:var(--mono);color:var(--signal);font-size:12px;}
  .principle h3{font-size:18px;margin-top:24px;line-height:1.25;font-weight:500;}
  .principle .plabel{font-size:13.5px;color:#9096A0;margin-top:10px;}
  @media(max-width:900px){.principles{grid-template-columns:1fr 1fr;}}
  @media(max-width:560px){.principles{grid-template-columns:1fr;}}

  /* ---------- FOUNDER ---------- */
  .founder{display:grid;grid-template-columns:.85fr 1.15fr;gap:70px;align-items:start;}
  .founder-visual{
    aspect-ratio:4/5;background:var(--white);border:1px solid var(--line);
    display:flex;align-items:center;justify-content:center;position:relative;
  }
  .founder-visual .frame-corner{position:absolute;width:16px;height:16px;border:1.4px solid var(--signal);}
  .fc-tl{top:14px;left:14px;border-right:none;border-bottom:none;}
  .fc-br{bottom:14px;right:14px;border-left:none;border-top:none;}
  .founder-visual .fv-label{font-family:var(--mono);font-size:11px;color:var(--steel);text-align:center;letter-spacing:.04em;padding:0 20px;}
  .founder-cred{font-family:var(--mono);font-size:13px;color:var(--signal);margin-bottom:14px;}
  .founder h2{font-size:clamp(26px,3vw,36px);margin-bottom:22px;}
  .founder p{color:var(--steel);margin-bottom:16px;max-width:560px;}
  .founder p strong{color:var(--ink);font-weight:600;}
  .stat-row{display:flex;gap:44px;margin-top:36px;flex-wrap:wrap;}
  .stat b{font-family:var(--display);font-size:30px;display:block;}
  .stat span{font-family:var(--mono);font-size:11.5px;color:var(--steel);letter-spacing:.03em;}

  /* ---------- WHY 3D PRINTING ---------- */
  .print-band{background:var(--paper-2);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
  .print-grid{display:grid;grid-template-columns:.9fr 1.1fr;gap:60px;align-items:center;}
  .benefit-list{display:flex;flex-direction:column;}
  .benefit-row{display:flex;align-items:baseline;gap:18px;padding:16px 0;border-top:1px solid var(--line);font-size:15.5px;}
  .benefit-row:last-child{border-bottom:1px solid var(--line);}
  .benefit-idx{font-family:var(--mono);font-size:11px;color:var(--signal);width:22px;flex-shrink:0;}
  .print-diagram{
    background:var(--white);border:1px solid var(--line);padding:36px;
    font-family:var(--mono);font-size:12px;color:var(--steel);
  }
  .print-diagram svg{width:100%;height:auto;display:block;margin-bottom:18px;}
  .layer-line{stroke:var(--line);stroke-width:1;}
  .layer-active{stroke:var(--signal);stroke-width:1.6;}

  /* ---------- PRODUCTS ---------- */
  .product{
    display:grid;grid-template-columns:200px 1fr 1.2fr;gap:36px;
    padding:44px 0;border-top:1px solid var(--line);align-items:start;
  }
  .product:last-child{border-bottom:1px solid var(--line);}
  .product-level{font-family:var(--mono);}
  .product-level .plevel-tag{
    display:inline-block;font-size:11px;letter-spacing:.05em;color:var(--signal);
    border:1px solid var(--signal); padding:3px 8px;margin-bottom:10px;
  }
  .product-level .prange{font-size:22px;color:var(--ink);display:block;}
  .product-level .pregion{font-size:12px;color:var(--steel);margin-top:4px;}
  .product h3{font-size:23px;margin-bottom:10px;}
  .product .pdesc{color:var(--steel);font-size:15px;max-width:340px;}
  .product .pfeatures{display:flex;flex-wrap:wrap;gap:8px 10px;margin-top:18px;}
  .pfeature{
    font-family:var(--mono);font-size:11px;color:var(--ink);background:var(--paper-2);
    padding:5px 10px;border:1px solid var(--line);
  }
  .product-visual{
    height:150px;border:1px solid var(--line);background:var(--white);
    display:flex;align-items:center;justify-content:center;position:relative;
  }
  @media(max-width:900px){.product{grid-template-columns:1fr;}}

  /* ---------- CUSTOMIZATION ---------- */
  .custom-band{background:var(--ink);color:var(--paper);}
  .custom-band .section-head p{color:#B9BEC4;}
  .custom-grid{display:grid;grid-template-columns:1fr 1fr;gap:70px;align-items:center;}
  .spec-sheet{
    font-family:var(--mono);font-size:13px;border:1px solid #ffffff26;
  }
  .spec-row{display:flex;justify-content:space-between;padding:14px 20px;border-bottom:1px solid #ffffff1c;}
  .spec-row:last-child{border-bottom:none;}
  .spec-row span:first-child{color:#9096A0;}
  .spec-row span:last-child{color:var(--signal);}
  .custom-note{color:#B9BEC4;font-size:15px;margin-top:24px;max-width:460px;}

  /* ---------- CONSULT + EDUCATION split ---------- */
  .split{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--line);border:1px solid var(--line);}
  .split-panel{background:var(--paper);padding:56px 48px;}
  .split-panel .eyebrow{margin-bottom:18px;}
  .split-panel h3{font-size:26px;margin-bottom:16px;}
  .split-panel p{color:var(--steel);margin-bottom:20px;}
  .check-list{list-style:none;font-size:14.5px;}
  .check-list li{padding:8px 0;border-top:1px solid var(--line-soft);display:flex;gap:10px;}
  .check-list li::before{content:'—';color:var(--signal);font-family:var(--mono);}
  @media(max-width:820px){.split{grid-template-columns:1fr;}}

  /* ---------- FUTURE / CHANNELS ---------- */
  .future-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:1px;background:var(--line);border:1px solid var(--line);}
  .future-item{background:var(--paper);padding:24px 18px;font-family:var(--mono);font-size:13px;min-height:110px;display:flex;align-items:flex-end;color:var(--ink);}
  @media(max-width:900px){.future-grid{grid-template-columns:repeat(2,1fr);}}

  .channels{display:flex;flex-wrap:wrap;gap:14px;margin-top:24px;}
  .channel-pill{
    font-family:var(--mono);font-size:12.5px;border:1px solid var(--ink);padding:9px 18px;
  }

  /* ---------- CTA / FOOTER ---------- */
  .cta{text-align:center;padding:140px 0;}
  .cta h2{font-size:clamp(34px,5vw,58px);max-width:760px;margin:0 auto 30px;line-height:1.05;}
  .cta p{color:var(--steel);max-width:480px;margin:0 auto 36px;}
  footer{border-top:1px solid var(--line);padding:50px 0;}
  .foot-grid{display:flex;justify-content:space-between;align-items:flex-start;flex-wrap:wrap;gap:30px;}
  .foot-cols{display:flex;gap:60px;flex-wrap:wrap;}
  .foot-col h4{font-family:var(--mono);font-size:11px;letter-spacing:.06em;color:var(--steel);margin-bottom:14px;text-transform:uppercase;}
  .foot-col a{display:block;font-size:14px;color:var(--ink);text-decoration:none;margin-bottom:9px;}
  .foot-col a:hover{color:var(--signal);}
  .foot-bottom{margin-top:60px;padding-top:24px;border-top:1px solid var(--line-soft);font-family:var(--mono);font-size:11.5px;color:var(--steel-2);display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;}

  .reveal{opacity:0;transform:translateY(18px);transition:opacity .7s ease, transform .7s ease;}
  .reveal.in{opacity:1;transform:translateY(0);}

/* ---------- PHOTO PLACEHOLDER (swap for real photography) ---------- */
.photo-slot{
  position:relative;background:var(--white);border:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;overflow:hidden;
}
.photo-slot img{width:100%;height:100%;object-fit:cover;display:block;}
.photo-slot .ph-fallback{
  display:flex;flex-direction:column;align-items:center;gap:10px;
  font-family:var(--mono);font-size:11px;color:var(--steel-2);text-align:center;padding:20px;
}
.photo-slot .ph-fallback svg{opacity:.5;}
.photo-slot .ph-fallback .ph-filename{color:var(--signal);}

/* ---------- BREADCRUMB ---------- */
.breadcrumb{
  font-family:var(--mono);font-size:12px;color:var(--steel);
  display:flex;align-items:center;gap:8px;padding-top:130px;margin-bottom:26px;
}
.breadcrumb a{color:var(--steel);text-decoration:none;}
.breadcrumb a:hover{color:var(--signal);}
.breadcrumb span{color:var(--steel-2);}

/* ---------- PRODUCT DETAIL HERO ---------- */
.pd-hero{display:grid;grid-template-columns:1fr 1fr;gap:56px;padding-bottom:90px;}
.pd-gallery{display:flex;flex-direction:column;gap:12px;}
.pd-gallery .photo-slot.main{aspect-ratio:1/1;}
.pd-thumbs{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;}
.pd-thumbs .photo-slot{aspect-ratio:1/1;cursor:pointer;}
.pd-thumbs .photo-slot.active{border-color:var(--signal);}
.pd-level-tag{
  display:inline-block;font-family:var(--mono);font-size:11px;letter-spacing:.05em;
  color:var(--signal);border:1px solid var(--signal);padding:3px 8px;margin-bottom:16px;
}
.pd-info h1{font-size:clamp(30px,3.4vw,42px);margin-bottom:14px;line-height:1.05;}
.pd-price{font-family:var(--mono);font-size:20px;color:var(--ink);margin-bottom:20px;}
.pd-price .pd-price-note{font-size:12px;color:var(--steel);display:block;margin-top:4px;}
.pd-lede{color:var(--steel);font-size:16px;margin-bottom:28px;max-width:460px;}

.option-group{margin-bottom:24px;}
.option-label{font-family:var(--mono);font-size:11px;letter-spacing:.05em;color:var(--steel);text-transform:uppercase;margin-bottom:10px;display:block;}
.option-pills{display:flex;flex-wrap:wrap;gap:10px;}
.option-pill{
  font-family:var(--mono);font-size:12.5px;border:1px solid var(--line);padding:9px 16px;
  cursor:pointer;background:var(--white);transition:all .15s;
}
.option-pill:hover{border-color:var(--ink);}
.option-pill.selected{border-color:var(--signal);color:var(--signal);background:var(--signal-dim);}

.pd-actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:30px;margin-bottom:20px;}
.pd-note{font-family:var(--mono);font-size:11.5px;color:var(--steel);border-top:1px solid var(--line);padding-top:16px;max-width:460px;}

.pd-section{padding:70px 0;border-top:1px solid var(--line);}
.pd-section-inner{display:grid;grid-template-columns:.4fr 1fr;gap:56px;}
.pd-section-inner h2{font-size:26px;margin-bottom:6px;}
@media(max-width:820px){.pd-hero{grid-template-columns:1fr;}.pd-section-inner{grid-template-columns:1fr;}}

.spec-table{width:100%;border-collapse:collapse;font-family:var(--mono);font-size:13.5px;}
.spec-table th{text-align:left;font-size:11px;letter-spacing:.05em;color:var(--steel);text-transform:uppercase;padding:0 0 12px;border-bottom:1px solid var(--line);}
.spec-table td{padding:14px 0;border-bottom:1px solid var(--line-soft);}
.spec-table tr:last-child td{border-bottom:1px solid var(--line);}

.use-list{list-style:none;}
.use-list li{
  display:flex;gap:14px;padding:16px 0;border-bottom:1px solid var(--line-soft);font-size:15px;color:var(--steel);
}
.use-list li b{color:var(--ink);font-weight:600;min-width:150px;flex-shrink:0;}

.related-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
.related-card{border:1px solid var(--line);background:var(--white);text-decoration:none;color:var(--ink);display:block;}
.related-card .photo-slot{aspect-ratio:1/1;}
.related-card .rc-body{padding:16px;}
.related-card .rc-level{font-family:var(--mono);font-size:10.5px;color:var(--signal);margin-bottom:6px;}
.related-card h4{font-size:15px;font-weight:500;}
@media(max-width:900px){.related-grid{grid-template-columns:repeat(2,1fr);}}

.product-row-link{text-decoration:none;color:inherit;display:block;}
.product-row-link:hover .pfeature{border-color:var(--signal);}
.product-view-link{
  font-family:var(--mono);font-size:12px;color:var(--signal);text-decoration:none;
  display:inline-flex;align-items:center;gap:6px;margin-top:18px;
}
.product-view-link:hover{text-decoration:underline;}