:root{
        --bg:#edf0f2; --surface:#ffffff; --surface-2:#e2e8ec;
        --ink:#131a20; --muted:#52636f; --line:#d2dbe1;
        --accent:#b45309; --accent-strong:#93400a; --accent-ink:#ffffff;
        --band:#0b1013; --band-2:#131b20; --band-ink:#e9eff3; --band-muted:#9db0bc;
        --radius:10px;
      }
      @media (prefers-color-scheme: dark){
        :root{
          --bg:#0c1114; --surface:#141b20; --surface-2:#1a232a;
          --ink:#e9eef1; --muted:#9db0bb; --line:#27333c;
          --accent:#e07f35; --accent-strong:#eda05e; --accent-ink:#17100a;
        }
      }
      *{ box-sizing:border-box; }
      html{ scroll-behavior:smooth; }
      @media (prefers-reduced-motion: reduce){ html{ scroll-behavior:auto; } }
      body{
        margin:0; background:var(--bg); color:var(--ink);
        font-family:"Archivo", system-ui, -apple-system, "Segoe UI", sans-serif;
        font-size:17px; line-height:1.6; -webkit-font-smoothing:antialiased;
      }
      img{ max-width:100%; display:block; }
      a{ color:var(--accent); }
      .wrap{ max-width:1180px; margin:0 auto; padding-inline:24px; }
      .mono{ font-family:"IBM Plex Mono", ui-monospace, monospace; }
      section{ scroll-margin-top:76px; }
      .section{ padding:84px 0; }
      .section + .section{ border-top:1px solid var(--line); }
      h1,h2,h3{ line-height:1.12; letter-spacing:-0.02em; margin:0; }
      h2{ font-size:clamp(28px, 3.6vw, 40px); font-weight:800; max-width:22em; }
      h3{ font-size:21px; font-weight:700; }
      .lede{ color:var(--muted); font-size:19px; max-width:44em; margin:16px 0 0; }
      .sec-head{ margin-bottom:40px; }
      .tag{
        display:inline-block; font-family:"IBM Plex Mono", monospace; font-size:12.5px;
        letter-spacing:.14em; text-transform:uppercase; color:var(--accent);
        border:1px solid currentColor; border-radius:999px; padding:4px 12px; margin-bottom:18px;
      }

      /* ---------- header ---------- */
      header.site{
        position:sticky; top:0; z-index:50;
        background:color-mix(in srgb, var(--bg) 88%, transparent);
        backdrop-filter:blur(10px); -webkit-backdrop-filter:blur(10px);
        border-bottom:1px solid var(--line);
      }
      .header-in{ display:flex; align-items:center; gap:28px; height:62px; }
      .brand{ font-weight:800; font-size:20px; letter-spacing:-0.01em; color:var(--ink); text-decoration:none; white-space:nowrap; }
      .brand b{ color:var(--accent); font-weight:800; }
      nav.main{ display:flex; gap:24px; margin-left:auto; }
      nav.main a{ color:var(--muted); text-decoration:none; font-size:15.5px; font-weight:600; padding:6px 2px; }
      nav.main a:hover{ color:var(--ink); }
      nav.main a.active{ color:var(--accent); }
      .btn{
        display:inline-block; background:var(--accent); color:var(--accent-ink);
        font-weight:700; font-size:16px; text-decoration:none; border:0; cursor:pointer;
        padding:12px 22px; border-radius:8px; line-height:1.2;
      }
      .btn:hover{ background:var(--accent-strong); }
      .btn.small{ padding:9px 16px; font-size:15px; }
      .btn.ghost{ background:transparent; color:var(--band-ink); border:1px solid #3a4750; }
      .btn.ghost:hover{ border-color:var(--band-muted); background:transparent; }
      .btn.ghost-l{ background:transparent; color:var(--ink); border:1px solid var(--line); }
      .btn.ghost-l:hover{ border-color:var(--muted); background:transparent; }
      @media (max-width:820px){ nav.main{ display:none; } .header-cta{ margin-left:auto; } }

      /* ---------- hero ---------- */
      .hero{ background:var(--band); color:var(--band-ink); }
      .hero-in{ display:flex; gap:48px; align-items:center; padding:72px 0 64px; }
      .hero-in > div{ flex:1.05 1 0; min-width:0; }
      .hero-in > figure{ flex:1 1 0; min-width:0; }
      .hero h1{ font-size:clamp(34px, 4.6vw, 54px); font-weight:800; }
      .hero h1 .hl{ color:var(--accent); }
      @media (prefers-color-scheme: light){ .hero h1 .hl{ color:#eda05e; } }
      .hero .sub{ color:var(--band-muted); font-size:19px; margin:20px 0 30px; max-width:34em; }
      .hero-ctas{ display:flex; gap:14px; flex-wrap:wrap; }
      .hero figure{ margin:0; }
      .hero figure img{ border-radius:var(--radius); aspect-ratio:3/2; object-fit:cover; width:100%; height:auto; }
      .hero figure figcaption{ color:var(--band-muted); font-size:13.5px; margin-top:10px; font-family:"IBM Plex Mono", monospace; }
      .stats{ display:grid; grid-template-columns:repeat(4, 1fr); border-top:1px solid #26313a; }
      .stat{ padding:22px 20px 26px; border-left:1px solid #26313a; }
      .stat:first-child{ border-left:0; padding-left:0; }
      .stat .v{ font-size:clamp(22px, 2.6vw, 31px); font-weight:800; letter-spacing:-0.02em; }
      .stat .k{ color:var(--band-muted); font-size:14px; margin-top:4px; }
      @media (max-width:900px){
        .hero-in{ flex-direction:column; align-items:stretch; padding:52px 0 44px; gap:32px; }
        .stats{ grid-template-columns:1fr 1fr; }
        .stat{ padding-left:0; border-left:0; border-top:1px solid #26313a; }
        .stat:nth-child(-n+2){ border-top:0; }
      }

      /* ---------- platform strip ---------- */
      .platform{ padding:26px 0; border-bottom:1px solid var(--line); }
      .platform .wrap{ display:flex; flex-wrap:wrap; gap:8px 26px; align-items:baseline; }
      .platform .lbl{ font-family:"IBM Plex Mono", monospace; font-size:12.5px; letter-spacing:.14em; text-transform:uppercase; color:var(--muted); margin-right:6px; }
      .platform span.item{ font-weight:600; font-size:15.5px; white-space:nowrap; }

      /* ---------- why ---------- */
      .why-grid{ display:grid; grid-template-columns:1fr 1fr; gap:0 56px; }
      .why-item{ display:grid; grid-template-columns:52px 1fr; gap:18px; padding:26px 0; border-top:1px solid var(--line); }
      .why-item .num{ font-family:"IBM Plex Mono", monospace; font-size:15px; font-weight:600; color:var(--accent); padding-top:4px; }
      .why-item p{ color:var(--muted); margin:8px 0 0; }
      @media (max-width:820px){ .why-grid{ grid-template-columns:1fr; } }

      /* ---------- machine ---------- */
      .machine{
        background:var(--surface); border:1px solid var(--line); border-radius:14px;
        overflow:hidden;
      }
      .machine.flagship{ display:grid; grid-template-columns:1fr 1.15fr; }
      .machine figure{ margin:0; }
      .machine figure img{ width:100%; height:100%; object-fit:cover; }
      .machine .body{ padding:30px 32px 32px; }
      .machine .model{ font-family:"IBM Plex Mono", monospace; font-size:13px; letter-spacing:.12em; text-transform:uppercase; color:var(--accent); }
      .machine h3{ font-size:25px; margin:8px 0 10px; }
      .machine .pos{ color:var(--muted); margin:0 0 20px; }
      dl.specs{ margin:0 0 22px; border-top:1px solid var(--line); }
      dl.specs .row{ display:grid; grid-template-columns:42% 58%; gap:12px; padding:8px 0; border-bottom:1px solid var(--line); }
      dl.specs dt{ font-family:"IBM Plex Mono", monospace; font-size:13px; color:var(--muted); padding-top:2px; }
      dl.specs dd{ margin:0; font-size:15.5px; font-weight:600; }
      .spec-note{ color:var(--muted); font-size:14px; margin-top:20px; }
      @media (max-width:900px){
        .machine.flagship{ grid-template-columns:1fr; }
        .machine figure img{ aspect-ratio:3/2; }
        .machine .body{ padding:24px 22px 26px; }
      }

      /* ---------- paths / steps ---------- */
      .steps{ display:grid; grid-template-columns:repeat(4, 1fr); gap:28px; counter-reset:step; }
      .steps.three{ grid-template-columns:repeat(3, 1fr); }
      .step{ border-top:3px solid var(--ink); padding-top:18px; }
      .step .n{ font-family:"IBM Plex Mono", monospace; font-size:13px; color:var(--accent); letter-spacing:.1em; }
      .step h3{ font-size:18.5px; margin:8px 0; }
      .step p{ color:var(--muted); margin:0 0 16px; font-size:15.5px; }
      @media (max-width:900px){ .steps, .steps.three{ grid-template-columns:1fr 1fr; } }
      @media (max-width:560px){ .steps, .steps.three{ grid-template-columns:1fr; } }

      /* ---------- technology ---------- */
      .tech-grid{ display:grid; grid-template-columns:1fr 1fr; gap:28px; }
      .tech-card{ background:var(--surface); border:1px solid var(--line); border-radius:14px; overflow:hidden; }
      .tech-card img{ width:100%; aspect-ratio:3/2; object-fit:cover; }
      .tech-card .body{ padding:26px 28px 28px; }
      .tech-card p{ color:var(--muted); margin:10px 0 0; }
      .tech-card ul{ color:var(--muted); margin:10px 0 0; padding-left:20px; }
      .tech-card li{ margin:5px 0; }
      .compare{ width:100%; border-collapse:collapse; margin-top:44px; background:var(--surface); border:1px solid var(--line); border-radius:14px; overflow:hidden; }
      .compare caption{ text-align:left; font-weight:700; font-size:19px; padding:0 0 14px; caption-side:top; }
      .compare th, .compare td{ text-align:left; padding:13px 18px; border-top:1px solid var(--line); vertical-align:top; font-size:15.5px; }
      .compare thead th{ border-top:0; font-family:"IBM Plex Mono", monospace; font-size:13px; letter-spacing:.08em; text-transform:uppercase; color:var(--muted); background:var(--surface-2); }
      .compare td:first-child{ font-weight:600; width:26%; }
      .compare td{ color:var(--muted); }
      .compare td b{ color:var(--ink); font-weight:600; }
      @media (max-width:820px){
        .tech-grid{ grid-template-columns:1fr; }
        .compare th, .compare td{ padding:11px 12px; font-size:14.5px; }
      }

      /* ---------- honesty note ---------- */
      .note{
        border:1px solid var(--accent); border-radius:14px; padding:28px 30px; margin-top:44px;
        background:var(--surface);
      }
      .note h3{ margin-bottom:10px; }
      .note p{ color:var(--muted); margin:0 0 10px; }
      .note p:last-child{ margin-bottom:0; }
      .note b{ color:var(--ink); }

      /* ---------- applications ---------- */
      .apps{ columns:2; column-gap:56px; }
      .app{ break-inside:avoid; padding:22px 0; border-top:1px solid var(--line); }
      .app h3{ font-size:19px; display:flex; gap:12px; align-items:baseline; }
      .app h3 .n{ font-family:"IBM Plex Mono", monospace; font-size:13px; color:var(--accent); font-weight:600; }
      .app p{ color:var(--muted); margin:8px 0 0; }
      @media (max-width:820px){ .apps{ columns:1; } }

      /* ---------- faq ---------- */
      .faq-list{ max-width:860px; }
      details.faq{ border-top:1px solid var(--line); }
      details.faq:last-child{ border-bottom:1px solid var(--line); }
      details.faq summary{
        cursor:pointer; list-style:none; display:flex; justify-content:space-between; align-items:center; gap:20px;
        font-weight:700; font-size:18.5px; padding:20px 4px;
      }
      details.faq summary::-webkit-details-marker{ display:none; }
      details.faq summary .chev{ flex:none; width:26px; height:26px; border:1px solid var(--line); border-radius:50%; display:grid; place-items:center; color:var(--accent); font-weight:400; transition:transform .18s ease; }
      details.faq[open ] summary .chev{ transform:rotate(45deg); }
      details.faq .a{ padding:0 4px 22px; color:var(--muted); max-width:46em; }
      details.faq .a p{ margin:0; }
      @media (prefers-reduced-motion: reduce){ details.faq summary .chev{ transition:none; } }

      /* ---------- contact ---------- */
      .quote{ background:var(--band); color:var(--band-ink); }
      .quote .lede{ color:var(--band-muted); }
      .quote-grid{ display:grid; grid-template-columns:1fr 1.35fr; gap:52px; }
      .quote .direct{ margin-top:28px; border-top:1px solid #26313a; padding-top:22px; }
      .quote .direct p{ color:var(--band-muted); margin:6px 0; font-size:15.5px; }
      .quote .direct a{ color:#eda05e; font-weight:600; }
      form.rfq{ display:grid; grid-template-columns:1fr 1fr; gap:16px; }
      form.rfq .full{ grid-column:1 / -1; }
      form.rfq label{ display:block; font-size:14px; font-weight:600; margin-bottom:6px; color:var(--band-ink); }
      form.rfq input, form.rfq select, form.rfq textarea{
        width:100%; font:inherit; font-size:16px; color:var(--band-ink);
        background:var(--band-2); border:1px solid #2c3942; border-radius:8px; padding:11px 13px;
      }
      form.rfq input::placeholder, form.rfq textarea::placeholder{ color:#71858f; }
      form.rfq input:focus, form.rfq select:focus, form.rfq textarea:focus{ outline:2px solid var(--accent); outline-offset:1px; border-color:transparent; }
      form.rfq .actions{ display:flex; gap:12px; flex-wrap:wrap; align-items:center; }
      .form-status{ font-size:14.5px; color:var(--band-muted); min-height:1.4em; margin:4px 0 0; }
      @media (max-width:900px){
        .quote-grid{ grid-template-columns:1fr; gap:36px; }
        form.rfq{ grid-template-columns:1fr; }
      }

      /* ---------- knowledge hub ---------- */
      .paths{ display:grid; grid-template-columns:repeat(3, 1fr); gap:28px; margin-bottom:52px; }
      a.path-card{ border-top:3px solid var(--ink); padding-top:18px; text-decoration:none; color:var(--ink); display:block; }
      a.path-card .n{ font-family:"IBM Plex Mono", monospace; font-size:13px; color:var(--accent); letter-spacing:.1em; }
      a.path-card h3{ font-size:19px; margin:8px 0; }
      a.path-card p{ color:var(--muted); margin:0; font-size:15.5px; }
      a.path-card .go{ color:var(--accent); font-weight:700; font-size:15px; display:inline-block; margin-top:12px; }
      a.path-card:hover h3{ color:var(--accent); }
      .guide-grid{ display:grid; grid-template-columns:1fr 1fr; gap:28px; }
      .guide-card{ background:var(--surface); border:1px solid var(--line); border-radius:14px; padding:28px 30px 30px; }
      .guide-card .gnum{ font-family:"IBM Plex Mono", monospace; font-size:13px; color:var(--accent); letter-spacing:.1em; }
      .guide-card h3{ font-size:22px; margin:8px 0 4px; }
      .guide-card p{ color:var(--muted); margin:10px 0 0; }
      .guide-card p b, .guide-card li b{ color:var(--ink); font-weight:600; }
      .guide-card ul{ color:var(--muted); margin:10px 0 0; padding-left:20px; }
      .guide-card li{ margin:5px 0; }
      @media (max-width:900px){ .paths{ grid-template-columns:1fr; } .guide-grid{ grid-template-columns:1fr; } }

      /* ---------- technology landscape ---------- */
      .route{ display:grid; grid-template-columns:230px 1fr 1fr; gap:8px 32px; padding:24px 0; border-top:1px solid var(--line); }
      .route:last-of-type{ border-bottom:1px solid var(--line); }
      .route h3{ font-size:19px; }
      .route .route-tag{ font-family:"IBM Plex Mono", monospace; font-size:12px; letter-spacing:.1em; text-transform:uppercase; color:var(--accent); display:block; margin-top:6px; }
      .route p{ color:var(--muted); margin:0; font-size:15.5px; }
      .route p b{ color:var(--ink); font-weight:600; }
      .route .status-line{ margin-top:8px; }
      .status{ display:inline-block; font-family:"IBM Plex Mono", monospace; font-size:11.5px; letter-spacing:.08em; text-transform:uppercase; border:1px solid var(--line); border-radius:999px; padding:2px 10px; color:var(--muted); }
      .status.ours{ border-color:var(--accent); color:var(--accent); }
      .players{ margin-top:44px; }
      .players h3{ font-size:21px; margin-bottom:6px; }
      .players .intro{ color:var(--muted); max-width:46em; margin:0 0 8px; }
      .player{ padding:16px 0; border-top:1px solid var(--line); display:grid; grid-template-columns:230px 1fr; gap:8px 32px; }
      .player .pname{ font-weight:700; font-size:16.5px; }
      .player .pname span{ display:block; font-family:"IBM Plex Mono", monospace; font-size:12px; color:var(--muted); font-weight:400; letter-spacing:.06em; margin-top:3px; }
      .player p{ color:var(--muted); margin:0; font-size:15.5px; }
      @media (max-width:820px){ .route, .player{ grid-template-columns:1fr; } }

      /* ---------- glossary ---------- */
      .glos{ display:grid; grid-template-columns:1fr 1fr; gap:0 56px; }
      .glos .term{ padding:18px 0; border-top:1px solid var(--line); }
      .glos dt{ font-weight:700; font-size:17.5px; }
      .glos dt .alt{ font-family:"IBM Plex Mono", monospace; font-size:12px; color:var(--accent); font-weight:500; letter-spacing:.06em; margin-left:8px; }
      .glos dd{ margin:6px 0 0; color:var(--muted); font-size:15.5px; }
      @media (max-width:820px){ .glos{ grid-template-columns:1fr; } }
      .app .status{ margin-top:12px; }

      /* ---------- footer ---------- */
      footer.site{ padding:52px 0 40px; }
      .foot-grid{ display:grid; grid-template-columns:1.5fr 1fr 1fr 1fr; gap:36px; }
      footer.site h4{ font-family:"IBM Plex Mono", monospace; font-size:12.5px; letter-spacing:.14em; text-transform:uppercase; color:var(--muted); margin:0 0 14px; font-weight:600; }
      footer.site ul{ list-style:none; margin:0; padding:0; }
      footer.site li{ margin:7px 0; }
      footer.site a{ color:var(--ink); text-decoration:none; font-size:15.5px; }
      footer.site a:hover{ color:var(--accent); }
      .foot-brand p{ color:var(--muted); max-width:26em; margin:12px 0 0; font-size:15.5px; }
      .legal{ border-top:1px solid var(--line); margin-top:40px; padding-top:20px; color:var(--muted); font-size:13.5px; display:flex; justify-content:space-between; gap:16px; flex-wrap:wrap; }
      @media (max-width:820px){ .foot-grid{ grid-template-columns:1fr; } }

/* ---- v4 multi-page additions ---- */
.crumbs{ font-family:"IBM Plex Mono", monospace; font-size:13px; letter-spacing:.06em; color:var(--muted); margin:0 0 22px; }
.crumbs a{ color:var(--muted); }
.guide-card.standalone{ max-width:860px; }
.more-links{ max-width:860px; margin-top:36px; border-top:1px solid var(--line); padding-top:22px; }
.more-links h3{ font-size:16px; margin-bottom:10px; }
.more-links ul{ margin:0; padding-left:20px; }
.more-links li{ margin:6px 0; }
a.guide-card{ text-decoration:none; color:inherit; display:block; }
a.guide-card:hover{ border-color:var(--accent); }

/* ---- v4 escalation additions ---- */
h1.page-title{ font-size:clamp(28px, 3.6vw, 40px); font-weight:800; max-width:22em; }
.guide-card h2{ font-size:21px; font-weight:700; }
.path-card h2{ font-size:21px; font-weight:700; }
.route h2, .players h2{ font-size:21px; font-weight:700; }
.app h2{ font-size:21px; font-weight:700; }
.more-links h2{ font-size:18px; font-weight:700; margin-bottom:10px; }
.last-updated{ font-family:"IBM Plex Mono", monospace; font-size:13px; letter-spacing:.06em; color:var(--muted); margin:28px 0 0; }
.tldr{ max-width:860px; }
.tldr h2{ font-size:18px; font-weight:700; margin-bottom:8px; }
.qa-sec{ max-width:860px; margin-top:44px; }
.qa-sec > h2{ font-size:22px; font-weight:800; margin-bottom:18px; }
.foot-links{ display:flex; gap:18px; flex-wrap:wrap; margin-top:30px; font-size:14px; }
.skip-link{ position:absolute; left:-999px; top:0; background:var(--band); color:var(--band-ink); padding:10px 16px; z-index:50; }
.skip-link:focus{ left:8px; top:8px; }
:focus-visible{ outline:2px solid var(--accent); outline-offset:2px; }
.prose{ max-width:820px; }
.prose h2{ font-size:24px; font-weight:800; margin:36px 0 10px; }
.prose p{ margin:10px 0; }
.prose ul{ margin:10px 0; padding-left:22px; }
.prose li{ margin:6px 0; }

/* ---- v4 responsive / multi-screen hardening ---- */
.wrap{ padding-left:max(24px, env(safe-area-inset-left)); padding-right:max(24px, env(safe-area-inset-right)); }
img, svg{ max-width:100%; height:auto; }
.nav-toggle{ display:none; }
.btn{ min-height:44px; }
.rfq input, .rfq select{ font-size:16px; min-height:44px; }
.rfq textarea{ min-height:44px; }
footer.site ul li a{ display:inline-block; padding:5px 0; }
.foot-links a{ display:inline-block; padding:8px 2px; }
@media (max-width:820px){
  .nav-toggle{ display:inline-flex; align-items:center; justify-content:center; min-height:44px; min-width:44px; padding:10px 16px; margin-left:auto; font:inherit; font-weight:600; font-size:15.5px; color:var(--ink); background:var(--surface); border:1px solid var(--line); border-radius:8px; cursor:pointer; }
  .header-cta{ margin-left:12px; }
  .header-in{ position:relative; }
  nav.main{ position:absolute; top:63px; left:0; right:0; z-index:60; background:var(--surface); border-bottom:1px solid var(--line); box-shadow:0 18px 30px rgba(0,0,0,.18); padding:10px 24px 14px; }
  nav.main.open{ display:flex; flex-direction:column; align-items:stretch; gap:2px; }
  nav.main a{ display:flex; align-items:center; min-height:44px; padding:10px 4px; }
}
@media (max-width:640px){
  table.compare{ display:block; overflow-x:auto; -webkit-overflow-scrolling:touch; }
  table.compare caption{ display:block; }
  .section{ padding:60px 0; }
}
@media (max-width:400px){
  .stats{ grid-template-columns:1fr; }
}