/* ============================== TOKENS ============================== */
  :root{
    /* light — engineering blueprint */
    --ink:#F3F5F8;
    --panel:#FFFFFF;
    --panel-2:#EDF1F6;
    --line:#D3DCE6;
    --grid:#E3E9F0;
    --text:#0E1622;
    --muted:#566173;
    --accent:#FFB020;          /* detection-box amber (fills, boxes) */
    --accent-ink:#8A5406;      /* amber that meets contrast as text on light */
    --live:#0F9E8B;            /* status teal, small use only */
    --shadow:0 1px 0 rgba(14,22,34,.04), 0 24px 60px -32px rgba(14,22,34,.25);
    --maxw:1140px;
    --sans:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
    --mono:ui-monospace,"SF Mono","Cascadia Code","JetBrains Mono",Consolas,"Liberation Mono",Menlo,monospace;
  }
  @media (prefers-color-scheme:dark){
    :root{
      --ink:#0A0E17;
      --panel:#10151F;
      --panel-2:#0D131D;
      --line:#1E2836;
      --grid:#141C29;
      --text:#E6ECF3;
      --muted:#8A97A8;
      --accent:#FFB020;
      --accent-ink:#FFC24D;
      --live:#34D3C1;
      --shadow:0 0 0 rgba(0,0,0,0), 0 30px 70px -40px rgba(0,0,0,.8);
    }
  }
  /* explicit toggle overrides (must beat the media query both ways) */
  :root[data-theme="light"]{
    --ink:#F3F5F8;--panel:#FFFFFF;--panel-2:#EDF1F6;--line:#D3DCE6;--grid:#E3E9F0;
    --text:#0E1622;--muted:#566173;--accent:#FFB020;--accent-ink:#8A5406;--live:#0F9E8B;
    --shadow:0 1px 0 rgba(14,22,34,.04), 0 24px 60px -32px rgba(14,22,34,.25);
  }
  :root[data-theme="dark"]{
    --ink:#0A0E17;--panel:#10151F;--panel-2:#0D131D;--line:#1E2836;--grid:#141C29;
    --text:#E6ECF3;--muted:#8A97A8;--accent:#FFB020;--accent-ink:#FFC24D;--live:#34D3C1;
    --shadow:0 0 0 rgba(0,0,0,0), 0 30px 70px -40px rgba(0,0,0,.8);
  }

  /* ============================== BASE ============================== */
  *{box-sizing:border-box}
  html{scroll-behavior:smooth}
  body{
    margin:0;background:var(--ink);color:var(--text);
    font-family:var(--sans);font-size:16px;line-height:1.65;
    -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
    overflow-x:hidden;
  }
  /* graph-paper backdrop */
  body::before{
    content:"";position:fixed;inset:0;z-index:0;pointer-events:none;
    background-image:linear-gradient(var(--grid) 1px,transparent 1px),
                     linear-gradient(90deg,var(--grid) 1px,transparent 1px);
    background-size:44px 44px;opacity:.5;
    -webkit-mask-image:radial-gradient(120% 90% at 50% 0%,#000 40%,transparent 100%);
            mask-image:radial-gradient(120% 90% at 50% 0%,#000 40%,transparent 100%);
  }
  a{color:inherit;text-decoration:none}
  img{max-width:100%}
  h1,h2,h3,h4{text-wrap:balance;margin:0;letter-spacing:-.02em;font-weight:750;line-height:1.05}
  p{margin:0}
  ::selection{background:var(--accent);color:#0A0E17}
  :focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:2px}

  .wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 24px;position:relative;z-index:1}
  .mono{font-family:var(--mono)}
  .eyebrow{
    font-family:var(--mono);font-size:.72rem;letter-spacing:.16em;text-transform:uppercase;
    color:var(--accent-ink);display:inline-flex;align-items:center;gap:.55em;
  }
  .eyebrow::before{content:"";width:14px;height:1px;background:var(--accent);display:inline-block}
  .lead{color:var(--muted);font-size:1.12rem;max-width:60ch}

  /* ============================== HUD NAV ============================== */
  header.hud{
    position:sticky;top:0;z-index:50;
    background:color-mix(in srgb,var(--ink) 82%,transparent);
    backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
    border-bottom:1px solid var(--line);
  }
  .hud-in{display:flex;align-items:center;gap:22px;height:62px}
  .brand{display:flex;align-items:center;gap:11px;font-family:var(--mono);font-weight:600;letter-spacing:.02em;flex:0 0 auto}
  .brand svg{display:block;color:var(--accent)}
  .brand b{font-weight:700;letter-spacing:-.01em;font-family:var(--sans)}
  .brand .v{color:var(--muted);font-size:.68rem}
  nav.links{display:flex;gap:4px;margin-left:auto;flex-wrap:wrap}
  nav.links a{
    font-family:var(--mono);font-size:.82rem;color:var(--muted);
    padding:7px 11px;border-radius:6px;transition:color .15s,background .15s;white-space:nowrap;
  }
  nav.links a:hover{color:var(--text);background:var(--panel-2)}
  nav.links a.active{color:var(--text);background:var(--panel-2)}
  nav.links a.active::after{content:"";display:block;height:2px;background:var(--accent);margin-top:5px;border-radius:2px}
  .hud-actions{display:flex;align-items:center;gap:10px;flex:0 0 auto}
  .status{display:none;align-items:center;gap:7px;font-family:var(--mono);font-size:.72rem;color:var(--muted)}
  .dot{width:7px;height:7px;border-radius:50%;background:var(--live);box-shadow:0 0 0 0 var(--live);animation:pulse 2.6s infinite}
  @keyframes pulse{0%{box-shadow:0 0 0 0 color-mix(in srgb,var(--live) 60%,transparent)}70%{box-shadow:0 0 0 7px transparent}100%{box-shadow:0 0 0 0 transparent}}
  .btn{
    font-family:var(--mono);font-size:.82rem;font-weight:600;cursor:pointer;
    padding:9px 16px;border-radius:7px;border:1px solid var(--line);background:transparent;color:var(--text);
    transition:transform .12s,border-color .15s,background .15s;display:inline-flex;align-items:center;gap:.5em;
  }
  .btn:hover{transform:translateY(-1px);border-color:var(--muted)}
  .btn.primary{background:var(--accent);color:#0A0E17;border-color:var(--accent)}
  .btn.primary:hover{box-shadow:0 8px 24px -8px var(--accent)}
  .menu-toggle{display:none;background:transparent;border:1px solid var(--line);color:var(--text);
    border-radius:7px;padding:8px 10px;cursor:pointer;font-family:var(--mono)}

  /* ============================== PAGE / ROUTER ============================== */
  main{position:relative;z-index:1}
  section[data-page]{display:none;animation:pagein .4s ease both}
  section[data-page].active{display:block}
  @keyframes pagein{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}

  .section{padding:76px 0}
  .section.tight{padding:52px 0}
  .section-head{max-width:64ch;margin-bottom:40px;display:flex;flex-direction:column;gap:16px}
  .section-head h2{font-size:clamp(1.8rem,3.6vw,2.7rem)}

  /* corner-bracket viewport frame */
  .frame{position:relative;border:1px solid var(--line);border-radius:14px;background:var(--panel);}
  .frame::before,.frame::after{content:"";position:absolute;width:14px;height:14px;pointer-events:none}
  .frame::before{top:-1px;left:-1px;border-top:2px solid var(--accent);border-left:2px solid var(--accent);border-top-left-radius:14px}
  .frame::after{bottom:-1px;right:-1px;border-bottom:2px solid var(--accent);border-right:2px solid var(--accent);border-bottom-right-radius:14px}

  /* ============================== HERO ============================== */
  .hero{padding:66px 0 40px}
  .hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center}
  .hero h1{font-size:clamp(2.4rem,5.6vw,4.5rem);font-weight:800;margin:20px 0 0}
  .hero h1 .amber{color:var(--accent-ink)}
  .hero p.lead{margin-top:22px;font-size:1.2rem}
  .hero-cta{display:flex;gap:12px;margin-top:30px;flex-wrap:wrap}
  .canvas-wrap{position:relative;aspect-ratio:4/3;border-radius:14px;overflow:hidden;border:1px solid var(--line);background:var(--panel-2)}
  .canvas-wrap canvas{display:block;width:100%;height:100%}
  .canvas-tag{position:absolute;top:12px;left:12px;font-family:var(--mono);font-size:.68rem;color:var(--muted);
    background:color-mix(in srgb,var(--ink) 70%,transparent);padding:4px 8px;border-radius:5px;border:1px solid var(--line)}

  /* stat strip */
  .stats{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:12px;overflow:hidden;margin-top:54px}
  .stat{background:var(--panel);padding:22px 20px;display:flex;flex-direction:column;gap:6px}
  .stat .n{font-family:var(--mono);font-size:1.9rem;font-weight:700;color:var(--accent-ink);font-variant-numeric:tabular-nums;letter-spacing:-.02em}
  .stat .l{font-family:var(--mono);font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}

  /* ============================== CARDS ============================== */
  .grid{display:grid;gap:16px}
  .g2{grid-template-columns:repeat(2,1fr)}
  .g3{grid-template-columns:repeat(3,1fr)}
  .g4{grid-template-columns:repeat(4,1fr)}
  .card{
    position:relative;background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:24px;
    transition:border-color .18s,transform .18s,box-shadow .18s;overflow:hidden;
  }
  .card:hover{border-color:var(--accent);transform:translateY(-3px);box-shadow:var(--shadow)}
  /* detected-element hover label */
  .card[data-tag]::after{
    content:attr(data-tag);position:absolute;top:9px;right:10px;
    font-family:var(--mono);font-size:.64rem;color:var(--accent-ink);
    opacity:0;transform:translateY(-3px);transition:opacity .18s,transform .18s;
  }
  .card:hover[data-tag]::after{opacity:1;transform:none}
  .card h3{font-size:1.12rem;margin-bottom:8px}
  .card p{color:var(--muted);font-size:.95rem}
  .card .k{font-family:var(--mono);font-size:.72rem;color:var(--accent-ink);letter-spacing:.04em;display:block;margin-bottom:12px}
  .card .idx{font-family:var(--mono);font-size:.72rem;color:var(--muted);font-variant-numeric:tabular-nums}

  .feature-row{display:grid;grid-template-columns:.85fr 1.15fr;gap:36px;align-items:center;padding:34px 0;border-top:1px solid var(--line)}
  .feature-row:first-of-type{border-top:0}
  .feature-row .fr-media{border:1px solid var(--line);border-radius:12px;background:var(--panel);padding:20px;min-height:180px}
  .feature-row h3{font-size:1.5rem;margin-bottom:12px}
  .feature-row p{color:var(--muted)}
  .bul{list-style:none;padding:0;margin:14px 0 0;display:flex;flex-direction:column;gap:9px}
  .bul li{position:relative;padding-left:24px;color:var(--muted);font-size:.95rem}
  .bul li::before{content:"▸";position:absolute;left:2px;color:var(--accent-ink);font-family:var(--mono)}

  /* code block */
  .code{background:var(--panel-2);border:1px solid var(--line);border-radius:12px;padding:18px 20px;overflow-x:auto}
  .code pre{margin:0;font-family:var(--mono);font-size:.85rem;line-height:1.7;color:var(--text)}
  .code .c{color:var(--muted)}
  .code .a{color:var(--accent-ink)}

  /* pricing */
  .tiers{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
  .tier{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:28px;display:flex;flex-direction:column;gap:16px}
  .tier.feat{border-color:var(--accent)}
  .tier .price{font-family:var(--mono);font-size:2rem;font-weight:700;letter-spacing:-.02em}
  .tier .price small{font-size:.8rem;color:var(--muted);font-weight:400}
  .tier ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:10px;flex:1}
  .tier li{position:relative;padding-left:22px;font-size:.92rem;color:var(--muted)}
  .tier li::before{content:"✓";position:absolute;left:0;color:var(--accent-ink);font-family:var(--mono)}
  .tag-feat{font-family:var(--mono);font-size:.66rem;letter-spacing:.1em;text-transform:uppercase;color:#0A0E17;background:var(--accent);padding:3px 8px;border-radius:20px;align-self:flex-start}

  /* precedence chain */
  .chain{display:flex;flex-wrap:wrap;gap:10px;align-items:center;font-family:var(--mono);font-size:.85rem;margin-top:6px}
  .chain .node{border:1px solid var(--line);background:var(--panel);border-radius:7px;padding:7px 12px}
  .chain .arrow{color:var(--accent-ink)}

  /* CTA band */
  .cta-band{border:1px solid var(--line);border-radius:16px;background:
     radial-gradient(120% 160% at 100% 0%, color-mix(in srgb,var(--accent) 14%,transparent), transparent 60%),var(--panel);
     padding:44px;display:flex;justify-content:space-between;align-items:center;gap:28px;flex-wrap:wrap;margin-top:20px}
  .cta-band h2{font-size:clamp(1.5rem,3vw,2.2rem)}
  .cta-band p{color:var(--muted);margin-top:8px;max-width:48ch}

  /* ============================== FOOTER ============================== */
  footer{border-top:1px solid var(--line);margin-top:20px;padding:52px 0 40px;position:relative;z-index:1;background:var(--panel-2)}
  .foot-grid{display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:32px}
  .foot-grid h4{font-family:var(--mono);font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-bottom:14px;font-weight:600}
  .foot-grid a{display:block;color:var(--muted);font-size:.9rem;padding:5px 0;transition:color .15s}
  .foot-grid a:hover{color:var(--text)}
  .foot-brand p{color:var(--muted);font-size:.9rem;margin-top:12px;max-width:34ch}
  .foot-bottom{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-top:36px;padding-top:22px;border-top:1px solid var(--line);
    font-family:var(--mono);font-size:.74rem;color:var(--muted)}

  /* ============================== DEMOS ============================== */
  .demo-feature{display:grid;grid-template-columns:1.12fr .88fr;padding:0;overflow:hidden}
  .demo-player{position:relative;background:#05070C;min-height:220px}
  .demo-video{width:100%;height:100%;display:block;aspect-ratio:16/9;object-fit:cover;background:#05070C}
  .demo-badge{position:absolute;bottom:12px;left:12px;font-size:.7rem;color:#E6ECF3;
    background:rgba(5,7,12,.72);padding:5px 9px;border-radius:6px;border:1px solid rgba(255,255,255,.14)}
  .demo-feature figcaption{padding:28px;display:flex;flex-direction:column;gap:12px;justify-content:center}
  .demo-feature figcaption h3{font-size:1.4rem}
  .demo-feature figcaption p{color:var(--muted)}
  @media (max-width:820px){.demo-feature{grid-template-columns:1fr}}

  /* ============================== RESPONSIVE ============================== */
  @media (min-width:1000px){.status{display:flex}}
  @media (max-width:900px){
    .hero-grid{grid-template-columns:1fr;gap:28px}
    .canvas-wrap{order:-1}
    .g4{grid-template-columns:repeat(2,1fr)}
    .feature-row{grid-template-columns:1fr;gap:18px}
    .tiers{grid-template-columns:1fr}
    .foot-grid{grid-template-columns:1fr 1fr}
    nav.links{display:none;position:absolute;top:62px;left:0;right:0;background:var(--panel);border-bottom:1px solid var(--line);
      flex-direction:column;padding:12px;gap:2px}
    nav.links.open{display:flex}
    nav.links a{padding:11px 14px;font-size:.95rem}
    nav.links a.active::after{display:none}
    .menu-toggle{display:inline-block}
    .hud-actions .btn:not(.menu-toggle){display:none}
  }
  @media (max-width:560px){
    .stats{grid-template-columns:repeat(2,1fr)}
    .g2,.g3{grid-template-columns:1fr}
    .cta-band{padding:28px}
    .foot-grid{grid-template-columns:1fr}
    .section{padding:56px 0}
  }
  @media (prefers-reduced-motion:reduce){
    *{animation-duration:.001ms!important;transition-duration:.001ms!important}
    html{scroll-behavior:auto}
  }