/* ═══════════════════════════════════════════════════════════
     aai design system · site chrome
     Header / nav · content-page template · footer
     Tokens are IDENTICAL to the landing page (src/page.ts).
     Extensions are marked "ext:" — no new colors, no new voices.
     ═══════════════════════════════════════════════════════════ */

  /* ── tokens (verbatim from landing) ─────────────────────── */
  :root{
    color-scheme: light dark;
    --ease:cubic-bezier(.22,.61,.21,1);
    --dawn:#F6F4EE;
    --halo-warm:rgba(248,232,206,.9);
    --halo-cool:rgba(216,237,233,.9);
    --halo-spot:rgba(15,107,88,.05);
    --ink:#17211E;
    --mist:#54615C;
    --faint:#5F6B66;   /* was #68746F (4.42:1 — failed WCAG AA on small text); now 5.05:1 on --dawn */
    --spruce:#0F6B58;
    --spruce-deep:#0A5244;
    --on-spruce:#F6FBF9;
    --btn-grad:linear-gradient(180deg,#158069,#0F6B58 55%,#0C5D4B);
    --btn-grad-hover:linear-gradient(180deg,#1A8D74,#117459 55%,#0E6350);
    --btn-glow:rgba(15,107,88,.38);
    --glass:rgba(255,255,255,.40);
    --glass-hi:rgba(255,255,255,.70);
    --glass-inner:rgba(255,255,255,.70);
    --glass-under:rgba(23,33,30,.05);
    --edge-grad:linear-gradient(180deg,rgba(255,255,255,.95),rgba(255,255,255,.38) 38%,rgba(255,255,255,.14));
    --stroke:rgba(23,33,30,.09);
    --shadow:rgba(18,42,36,.16);
    --shadow-deep:rgba(18,42,36,.26);
    --ring:rgba(15,107,88,.10);
    --ring-line:rgba(15,107,88,.11);
    --focus-ring:rgba(15,107,88,.22);
    --grain:.035;
    --grain-glass:.018;
    /* ext: interaction wash for nav pills & link rows (ink at 5%) */
    --wash:rgba(23,33,30,.05);
    /* ext: chrome metrics shared by header + drawer offsets */
    --head-h:64px;
  }
  @media (prefers-color-scheme: dark){
    :root:not([data-theme="light"]){
      --dawn:#0B100E;
      --halo-warm:rgba(216,170,106,.17);
      --halo-cool:rgba(64,166,150,.22);
      --halo-spot:rgba(99,226,188,.14);
      --ink:#EEF3F1;
      --mist:#A4B0AA;
      --faint:#7E8B85;
      --spruce:#43D6A9;
      --spruce-deep:#63E2BC;
      --on-spruce:#07231A;
      --btn-grad:linear-gradient(180deg,#54E0B4,#3ECFA2 55%,#33BE93);
      --btn-grad-hover:linear-gradient(180deg,#66E7BE,#4AD7AB 55%,#3CC89C);
      --btn-glow:rgba(63,207,164,.30);
      --glass:rgba(255,255,255,.06);
      --glass-hi:rgba(255,255,255,.11);
      --glass-inner:rgba(255,255,255,.10);
      --glass-under:rgba(2,10,7,.5);
      --edge-grad:linear-gradient(180deg,rgba(255,255,255,.34),rgba(255,255,255,.10) 40%,rgba(255,255,255,.03));
      --stroke:rgba(255,255,255,.08);
      --shadow:rgba(2,10,7,.5);
      --shadow-deep:rgba(2,10,7,.68);
      --ring:rgba(96,214,180,.10);
      --ring-line:rgba(96,214,180,.10);
      --focus-ring:rgba(96,214,180,.28);
      --grain:.05;
      --grain-glass:.025;
      --wash:rgba(255,255,255,.07);
    }
  }
  :root[data-theme="dark"]{
    --dawn:#0B100E;
    --halo-warm:rgba(216,170,106,.17);
    --halo-cool:rgba(64,166,150,.22);
    --halo-spot:rgba(99,226,188,.14);
    --ink:#EEF3F1;
    --mist:#A4B0AA;
    --faint:#7E8B85;
    --spruce:#43D6A9;
    --spruce-deep:#63E2BC;
    --on-spruce:#07231A;
    --btn-grad:linear-gradient(180deg,#54E0B4,#3ECFA2 55%,#33BE93);
    --btn-grad-hover:linear-gradient(180deg,#66E7BE,#4AD7AB 55%,#3CC89C);
    --btn-glow:rgba(63,207,164,.30);
    --glass:rgba(255,255,255,.06);
    --glass-hi:rgba(255,255,255,.11);
    --glass-inner:rgba(255,255,255,.10);
    --glass-under:rgba(2,10,7,.5);
    --edge-grad:linear-gradient(180deg,rgba(255,255,255,.34),rgba(255,255,255,.10) 40%,rgba(255,255,255,.03));
    --stroke:rgba(255,255,255,.08);
    --shadow:rgba(2,10,7,.5);
    --shadow-deep:rgba(2,10,7,.68);
    --ring:rgba(96,214,180,.10);
    --ring-line:rgba(96,214,180,.10);
    --focus-ring:rgba(96,214,180,.28);
    --grain:.05;
    --grain-glass:.025;
    --wash:rgba(255,255,255,.07);
  }

  /* ── base (verbatim from landing) ───────────────────────── */
  *{box-sizing:border-box}
  html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
  body{
    margin:0;background:var(--dawn);color:var(--ink);
    font:16.5px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
    font-optical-sizing:auto;
    -webkit-font-smoothing:antialiased;overflow-x:hidden;
  }
  body::before{
    content:"";position:fixed;inset:0;z-index:-2;pointer-events:none;
    background:
      radial-gradient(54rem 38rem at 82% -10%, var(--halo-warm), transparent 62%),
      radial-gradient(46rem 34rem at 6% 12%,   var(--halo-cool), transparent 60%),
      radial-gradient(64rem 46rem at 55% 112%, var(--halo-cool), transparent 58%),
      var(--dawn);
  }
  body::after{
    content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:var(--grain);
    background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.82' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)'/%3E%3C/svg%3E");
    background-size:180px 180px;
  }
  a{color:inherit}
  h1,h2,h3{margin:0;font-weight:700;letter-spacing:-.025em;text-wrap:balance}
  p{margin:0;text-wrap:pretty}
  blockquote{margin:0}
  ::selection{background:var(--spruce);color:var(--on-spruce)}
  :focus-visible{outline:2px solid var(--spruce);outline-offset:3px}
  .wrap{max-width:1064px;margin:0 auto;padding:0 24px}
  .num{font-variant-numeric:tabular-nums;letter-spacing:.01em}
  .sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

  .kicker{font-family:ui-monospace,"SF Mono",SFMono-Regular,Menlo,monospace;
    font-size:11px;font-weight:500;letter-spacing:.18em;text-transform:uppercase;
    color:var(--spruce);margin-bottom:18px}

  /* skip link — hidden until keyboard focus */
  .skip{position:fixed;top:12px;left:12px;z-index:200;transform:translateY(-64px);
    padding:10px 18px;border-radius:999px;font-size:14px;font-weight:600;text-decoration:none;
    color:var(--on-spruce);background:var(--btn-grad);
    box-shadow:0 12px 26px -12px var(--btn-glow);
    transition:transform .2s var(--ease)}
  .skip:focus-visible{transform:translateY(0);outline-offset:2px}

  /* ── glass material (verbatim from landing) ─────────────── */
  .glass{
    position:relative;isolation:isolate;border-radius:24px;
    background:linear-gradient(165deg,var(--glass-hi),var(--glass));
    -webkit-backdrop-filter:blur(26px) saturate(170%);
    backdrop-filter:blur(26px) saturate(170%);
    box-shadow:
      inset 0 1px 0 var(--glass-inner),
      inset 0 -1px 0 var(--glass-under),
      0 40px 80px -40px var(--shadow-deep),
      0 18px 40px -28px var(--shadow),
      0 2px 6px -2px var(--shadow);
  }
  .glass::before{
    content:"";position:absolute;inset:0;border-radius:inherit;padding:1px;
    background:var(--edge-grad);
    -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
    -webkit-mask-composite:xor;mask-composite:exclude;
    pointer-events:none;z-index:2;
  }
  .glass::after{
    content:"";position:absolute;inset:0;border-radius:inherit;
    pointer-events:none;z-index:1;opacity:var(--grain-glass);mix-blend-mode:overlay;
    background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.82' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)'/%3E%3C/svg%3E");
    background-size:180px 180px;
  }
  @supports not ((backdrop-filter:blur(1px)) or (-webkit-backdrop-filter:blur(1px))){
    .glass{background:linear-gradient(165deg,var(--glass-hi),var(--dawn))}
  }

  /* ── button (verbatim from landing) ─────────────────────── */
  .btn{
    position:relative;isolation:isolate;display:inline-flex;align-items:center;justify-content:center;gap:9px;
    height:48px;font:inherit;font-size:15px;font-weight:600;letter-spacing:-.005em;
    white-space:nowrap;cursor:pointer;text-decoration:none;color:var(--on-spruce);
    background:var(--btn-grad);border:none;border-radius:14px;padding:0 22px;
    box-shadow:
      inset 0 1px 0 rgba(255,255,255,.32),
      inset 0 -1px 0 rgba(0,0,0,.08),
      0 12px 26px -12px var(--btn-glow),
      0 2px 5px -2px var(--btn-glow);
    transition:transform .3s var(--ease),box-shadow .35s var(--ease)}
  .btn::before{content:"";position:absolute;inset:0;z-index:-1;border-radius:inherit;
    background:var(--btn-grad-hover);opacity:0;transition:opacity .3s var(--ease)}
  .btn:hover::before{opacity:1;transition-duration:.15s}
  .btn:hover{
    box-shadow:
      inset 0 1px 0 rgba(255,255,255,.36),
      inset 0 -1px 0 rgba(0,0,0,.08),
      0 16px 32px -12px var(--btn-glow),
      0 2px 5px -2px var(--btn-glow);
    transition-duration:.15s}
  .btn:active{transform:translateY(1px) scale(.985);transition-duration:.06s;
    box-shadow:inset 0 1px 0 rgba(255,255,255,.24),0 6px 14px -8px var(--btn-glow)}

  /* live status dot — the hero eyebrow's pulse, reused as the
     site-wide "line is open" motif (header pill + footer) */
  .live{width:6px;height:6px;border-radius:50%;background:var(--spruce);flex:none;
    animation:breathe 2.8s ease-in-out infinite}
  @keyframes breathe{0%,100%{box-shadow:0 0 0 0 var(--ring)}50%{box-shadow:0 0 0 6px var(--ring)}}

  /* ═════════════════════════════════════════════════════════
     1 · SITE HEADER — the first full-bleed glass surface.
     Same material recipe as .glass, worn as chrome: frosted
     fill, inset top highlight, its own grain, and the gradient
     hairline as a full-width bottom edge that fades at the
     viewport margins. position:sticky; ZERO JS required —
     the mega-menus are <details> disclosures.
     JS would only ENHANCE: close-on-Esc / close-on-outside-
     click for open <details>, and a scroll-elevation shadow.
     ═════════════════════════════════════════════════════════ */
  .site-head{
    position:sticky;top:0;z-index:60;isolation:isolate;
    background:linear-gradient(180deg,var(--glass-hi),var(--glass));
    -webkit-backdrop-filter:blur(22px) saturate(170%);
    backdrop-filter:blur(22px) saturate(170%);
    box-shadow:inset 0 1px 0 var(--glass-inner),0 18px 40px -32px var(--shadow);
  }
  /* grain on the chrome itself */
  .site-head::before{
    content:"";position:absolute;inset:0;pointer-events:none;z-index:0;
    opacity:var(--grain-glass);mix-blend-mode:overlay;
    background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.82' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)'/%3E%3C/svg%3E");
    background-size:180px 180px;
  }
  /* the hairline, gone horizontal: bright in the middle of the
     bar's underside, dissolving before it reaches the edges */
  .site-head::after{
    content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;pointer-events:none;
    background:linear-gradient(90deg,transparent,var(--stroke) 14%,var(--stroke) 86%,transparent);
  }
  @supports not ((backdrop-filter:blur(1px)) or (-webkit-backdrop-filter:blur(1px))){
    .site-head{background:var(--dawn)}
  }

  .shell{max-width:1200px;margin:0 auto;padding:0 24px;
    display:flex;align-items:center;gap:20px;height:var(--head-h)}

  .brand{display:flex;align-items:center;gap:9px;font-weight:700;font-size:20px;
    letter-spacing:-.03em;text-decoration:none;flex:none}
  .brand .mark{width:26px;height:26px;display:block;flex:none}
  .brand .mark:hover{opacity:.92}

  nav.primary{display:flex;align-items:center;gap:2px;margin:0 auto}
  nav.primary > a, nav.primary summary{
    position:relative;display:inline-flex;align-items:center;gap:6px;
    padding:8px 13px;border-radius:10px;
    font-size:14px;font-weight:500;letter-spacing:-.005em;
    color:var(--mist);text-decoration:none;cursor:pointer;white-space:nowrap;
    transition:color .3s var(--ease),background-color .3s var(--ease)}
  nav.primary > a:hover, nav.primary summary:hover{
    color:var(--ink);background:var(--wash);transition-duration:.15s}
  /* current section: ink + the brand dot, miniaturized, beneath */
  nav.primary a[aria-current="page"]{color:var(--ink);font-weight:600}
  nav.primary a[aria-current="page"]::after{
    content:"";position:absolute;left:50%;bottom:1px;transform:translateX(-50%);
    width:4px;height:4px;border-radius:50%;background:var(--spruce)}

  /* CSS-only disclosure menus */
  details.menu summary{list-style:none}
  details.menu summary::-webkit-details-marker{display:none}
  details.menu .car{width:9px;height:9px;flex:none;opacity:.7;
    transition:transform .25s var(--ease)}
  details.menu[open] summary{color:var(--ink);background:var(--wash)}
  details.menu[open] .car{transform:rotate(180deg)}

  /* the mega panel — a glass pane hung from the bar, centered
     on the header (the header is the positioned ancestor) */
  .mega{
    position:absolute;left:50%;top:calc(100% + 12px);transform:translateX(-50%);
    width:min(720px,calc(100vw - 32px));z-index:70;
    border-radius:22px;padding:26px;text-align:left;
    /* SOLID, opaque fill — this panel opens over the busy hero (ripple lines +
       the LIVE badge), so a translucent .glass background bled through. Lay an
       opaque --dawn base UNDER the frosted gradient: keeps the frosted look,
       never see-through, and independent of backdrop-filter support. */
    background:
      linear-gradient(165deg,var(--glass-hi),var(--glass)),
      var(--dawn);
  }
  /* The frosted gradient is now purely cosmetic over an opaque base, so the
     backdrop blur is no longer load-bearing — but keep it for the soft edge. */
  .mega-grid{position:relative;z-index:3;display:grid;grid-template-columns:220px 1fr;gap:26px}
  .mega-side{border-right:1px solid var(--stroke);padding-right:26px;
    display:flex;flex-direction:column}
  .mega-side .kicker{margin-bottom:12px}
  .mega-side .say{font-family:ui-serif,"New York",Georgia,serif;font-style:italic;
    font-size:16.5px;line-height:1.5;letter-spacing:-.01em;color:var(--ink)}
  .mega-side .all{margin-top:auto;padding-top:18px;font-size:13.5px;font-weight:600;
    color:var(--spruce);text-decoration:none}
  .mega-side .all:hover{text-decoration:underline;text-underline-offset:3px}
  .mega-links{display:grid;grid-template-columns:1fr 1fr;gap:2px;align-content:start}
  .mega-links a{display:block;padding:11px 13px;border-radius:12px;text-decoration:none;
    transition:background-color .3s var(--ease)}
  .mega-links a:hover{background:var(--wash);transition-duration:.15s}
  .mega-links .t{display:block;font-size:14px;font-weight:600;letter-spacing:-.01em;color:var(--ink)}
  .mega-links .d{display:block;font-size:12.5px;line-height:1.5;color:var(--faint);margin-top:2px}
  @media (max-width:720px){
    .mega-grid{grid-template-columns:1fr}
    .mega-side{border-right:none;border-bottom:1px solid var(--stroke);padding:0 0 18px}
    .mega-links{grid-template-columns:1fr}
  }

  .head-actions{display:flex;align-items:center;gap:12px;flex:none}
  /* the phone pill — landing's .navnum, now carrying the live dot:
     the line's open state as persistent header status */
  .navnum{display:inline-flex;align-items:center;gap:9px;
    font-size:13.5px;color:var(--mist);text-decoration:none;padding:9px 16px;border-radius:999px;
    background:var(--glass);border:1px solid var(--stroke);
    -webkit-backdrop-filter:blur(14px) saturate(160%);backdrop-filter:blur(14px) saturate(160%);
    transition:color .3s var(--ease),border-color .3s var(--ease)}
  .navnum:hover{color:var(--ink);border-color:var(--ring-line);transition-duration:.15s}
  .navnum b{color:var(--ink);font-weight:600}
  .head-cta{height:40px;padding:0 18px;font-size:14px;border-radius:12px}

  /* mobile: primary nav folds into a CSS-only drawer (<details>).
     JS would only ENHANCE: body scroll-lock while open, focus trap. */
  details.m-nav{display:none}
  details.m-nav summary{list-style:none;cursor:pointer;
    display:inline-flex;align-items:center;justify-content:center;
    width:40px;height:40px;border-radius:12px;color:var(--ink);
    border:1px solid var(--stroke);background:var(--glass);
    transition:background-color .3s var(--ease)}
  details.m-nav summary:hover{background:var(--wash)}
  details.m-nav summary::-webkit-details-marker{display:none}
  details.m-nav svg{width:18px;height:18px}
  details.m-nav .ic-x{display:none}
  details.m-nav[open] .ic-burger{display:none}
  details.m-nav[open] .ic-x{display:block}
  .drawer{position:absolute;left:12px;right:12px;top:calc(100% + 10px);z-index:70;
    border-radius:22px;padding:14px}
  .drawer-in{position:relative;z-index:3;display:flex;flex-direction:column}
  .drawer a.item, .drawer summary.item{display:flex;align-items:center;justify-content:space-between;
    padding:13px 14px;border-radius:12px;font-size:16px;font-weight:600;letter-spacing:-.01em;
    color:var(--ink);text-decoration:none;cursor:pointer;list-style:none}
  .drawer summary.item::-webkit-details-marker{display:none}
  .drawer a.item:hover, .drawer summary.item:hover{background:var(--wash)}
  .drawer a.item[aria-current="page"]{color:var(--spruce)}
  .drawer .car{width:10px;height:10px;opacity:.6;transition:transform .25s var(--ease)}
  .drawer details[open] > summary .car{transform:rotate(180deg)}
  .drawer .sub{padding:2px 0 8px}
  .drawer .sub a{display:block;padding:9px 14px 9px 26px;border-radius:10px;
    font-size:14.5px;color:var(--mist);text-decoration:none}
  .drawer .sub a:hover{color:var(--ink);background:var(--wash)}
  .drawer .d-foot{border-top:1px solid var(--stroke);margin-top:10px;padding:16px 6px 6px;
    display:flex;flex-direction:column;gap:12px}
  .drawer .d-foot .navnum{justify-content:center}
  @media (max-width:880px){
    nav.primary{display:none}
    details.m-nav{display:block}
    .head-actions .navnum{display:none} /* number lives in the drawer */
  }
  @media (max-width:420px){
    .head-cta{display:none} /* drawer carries the CTA */
  }

  /* ═════════════════════════════════════════════════════════
     2 · CONTENT-PAGE TEMPLATE
     eyebrow → H1 → lede, then a 65ch measure with a sticky
     "on this page" rail; closing CTA band. Zero JS.
     ═════════════════════════════════════════════════════════ */
  .page-head{padding:84px 0 56px;max-width:720px}
  .page-head .kicker{margin-bottom:16px}
  .page-title{font-size:clamp(34px,4.6vw,50px);font-weight:650;line-height:1.05;
    letter-spacing:-.03em;margin-bottom:18px}
  .page-lede{font-size:clamp(16.5px,2vw,19px);line-height:1.6;color:var(--mist);max-width:52ch}

  .page-grid{display:grid;grid-template-columns:minmax(0,65ch) 200px;
    gap:72px;align-items:start}
  @media (max-width:940px){
    .page-grid{grid-template-columns:minmax(0,65ch)}
    .toc{display:none} /* production: reappears as a <details> "On this page" above the article */
  }

  .toc{position:sticky;top:calc(var(--head-h) + 32px)}
  .toc .lbl{font-family:ui-monospace,"SF Mono",SFMono-Regular,Menlo,monospace;
    font-size:11px;font-weight:500;letter-spacing:.18em;text-transform:uppercase;
    color:var(--faint);margin-bottom:14px}
  .toc ol{list-style:none;margin:0;padding:0;border-left:1px solid var(--stroke);
    display:flex;flex-direction:column}
  .toc a{display:block;padding:6px 0 6px 16px;margin-left:-1px;border-left:1px solid transparent;
    font-size:13px;line-height:1.45;color:var(--mist);text-decoration:none;
    transition:color .3s var(--ease),border-color .3s var(--ease)}
  .toc a:hover{color:var(--ink);transition-duration:.15s}
  .toc a.is-here{color:var(--spruce);font-weight:600;border-left-color:var(--spruce)}
  /* production note: .is-here tracks scroll via a tiny IntersectionObserver —
     the only JS on inner pages, and purely an enhancement */

  .prose{font-size:16px;line-height:1.7}
  .prose > *{margin:0 0 18px}
  .prose h2{font-size:23px;font-weight:700;letter-spacing:-.025em;line-height:1.2;
    margin:46px 0 14px;scroll-margin-top:calc(var(--head-h) + 24px)}
  .prose h2:first-child{margin-top:0}
  .prose h3{font-size:17.5px;font-weight:600;letter-spacing:-.015em;margin:30px 0 10px}
  .prose p{color:var(--ink)}
  .prose .muted{color:var(--mist)}
  .prose ul{padding:0 0 0 2px;list-style:none;display:flex;flex-direction:column;gap:10px}
  .prose ul li{position:relative;padding-left:26px;color:var(--ink)}
  .prose ul li::before{content:"\2713";position:absolute;left:2px;top:1px;
    color:var(--spruce);font-weight:700;font-size:13px}
  .prose a{color:var(--spruce);text-decoration:underline;text-underline-offset:3px;
    text-decoration-color:var(--ring-line);transition:text-decoration-color .2s var(--ease)}
  .prose a:hover{text-decoration-color:var(--spruce)}
  .prose b{font-weight:600}

  /* the serif voice — reserved, as on the landing, for the human moment */
  .pull{padding:30px 32px;border-radius:20px;margin:30px 0}
  .pull .q{position:relative;z-index:3;font-family:ui-serif,"New York",Georgia,serif;
    font-style:italic;font-size:19px;line-height:1.5;letter-spacing:-.01em;color:var(--ink)}
  .pull .a{position:relative;z-index:3;margin-top:12px;font-size:13px;color:var(--mist)}

  /* spec rows — one pane, hairline-divided, mono labels (the
     .feats grammar applied to reference content) */
  .rows{border-radius:20px;margin:30px 0;overflow:hidden}
  .rows .row{position:relative;z-index:3;display:grid;grid-template-columns:150px 1fr;
    gap:20px;padding:18px 26px;border-top:1px solid var(--stroke)}
  .rows .row:first-child{border-top:none}
  .rows .row .k{font-family:ui-monospace,"SF Mono",SFMono-Regular,Menlo,monospace;
    font-size:11px;font-weight:500;letter-spacing:.18em;text-transform:uppercase;
    color:var(--spruce);padding-top:4px}
  .rows .row .v{font-size:14.5px;line-height:1.6;color:var(--mist)}
  .rows .row .v b{color:var(--ink);font-weight:600}
  @media (max-width:560px){.rows .row{grid-template-columns:1fr;gap:6px;padding:16px 20px}}

  /* closing CTA band — every inner page ends on the line */
  .cta-band{margin:88px 0 0;padding:60px 32px;border-radius:28px;text-align:center}
  .cta-band > *{position:relative;z-index:3}
  .cta-band h2{font-size:clamp(24px,3.4vw,34px);letter-spacing:-.03em;margin-bottom:12px}
  .cta-band .sub{font-size:16px;line-height:1.6;color:var(--mist);max-width:44ch;margin:0 auto 32px}
  .cta-call{position:relative;isolation:isolate;
    display:inline-flex;align-items:center;gap:13px;text-decoration:none;
    height:58px;padding:0 34px;border-radius:999px;
    font-size:18.5px;font-weight:600;color:var(--on-spruce);
    background:var(--btn-grad);
    box-shadow:
      inset 0 1px 0 rgba(255,255,255,.32),
      inset 0 -1px 0 rgba(0,0,0,.08),
      0 26px 52px -20px var(--btn-glow),
      0 3px 8px -3px var(--btn-glow);
    transition:transform .3s var(--ease),box-shadow .35s var(--ease)}
  .cta-call::before{content:"";position:absolute;inset:0;z-index:-1;border-radius:inherit;
    background:var(--btn-grad-hover);opacity:0;transition:opacity .3s var(--ease)}
  .cta-call:hover::before{opacity:1;transition-duration:.15s}
  .cta-call svg{width:20px;height:20px}
  .cta-call:hover{transform:translateY(-1px);transition-duration:.15s;
    box-shadow:
      inset 0 1px 0 rgba(255,255,255,.36),
      inset 0 -1px 0 rgba(0,0,0,.08),
      0 32px 60px -22px var(--btn-glow),
      0 3px 8px -3px var(--btn-glow)}
  .cta-call:active{transform:translateY(1px) scale(.985);transition-duration:.06s}

  /* ═════════════════════════════════════════════════════════
     3 · SITE FOOTER — the header's settled counterpart:
     a frosted slab with the ring-of-light returning as a
     static watermark rising behind it. The line stays open.
     ═════════════════════════════════════════════════════════ */
  .site-foot{position:relative;isolation:isolate;margin-top:140px;overflow:hidden;
    background:linear-gradient(180deg,var(--glass) , var(--glass-hi));
    -webkit-backdrop-filter:blur(22px) saturate(170%);
    backdrop-filter:blur(22px) saturate(170%)}
  .site-foot::before{ /* top hairline, fading at the margins */
    content:"";position:absolute;left:0;right:0;top:0;height:1px;
    background:linear-gradient(90deg,transparent,var(--stroke) 14%,var(--stroke) 86%,transparent)}
  .site-foot::after{ /* grain on the slab */
    content:"";position:absolute;inset:0;pointer-events:none;z-index:0;
    opacity:var(--grain-glass);mix-blend-mode:overlay;
    background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.82' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23n)'/%3E%3C/svg%3E");
    background-size:180px 180px}
  /* the signature rings, at rest — no animation, just standing light */
  .foot-rings{position:absolute;left:50%;bottom:-72%;transform:translateX(-50%);
    width:min(1300px,180vw);aspect-ratio:1;pointer-events:none;z-index:0;opacity:.8;
    background:repeating-radial-gradient(circle at center,
      var(--ring-line) 0 1px, transparent 1px 96px);
    -webkit-mask-image:radial-gradient(circle at center, black 20%, transparent 62%);
    mask-image:radial-gradient(circle at center, black 20%, transparent 62%)}

  .foot-in{position:relative;z-index:2;max-width:1200px;margin:0 auto;padding:64px 24px 28px}
  .foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1fr 1fr 1fr;gap:40px 32px}
  @media (max-width:1020px){.foot-grid{grid-template-columns:repeat(3,1fr)}
    .foot-brand{grid-column:1 / -1;max-width:420px}}
  @media (max-width:560px){.foot-grid{grid-template-columns:repeat(2,1fr)}}

  .foot-brand{display:flex;flex-direction:column;align-items:flex-start;gap:16px;padding-right:24px}
  .foot-brand .brand{font-size:18px}
  .foot-brand .pos{font-family:ui-serif,"New York",Georgia,serif;font-style:italic;
    font-size:16px;line-height:1.55;letter-spacing:-.01em;color:var(--mist);max-width:26ch}
  .foot-brand .navnum{margin-top:2px}
  .foot-brand .legalnote{font-size:12px;line-height:1.6;color:var(--faint);max-width:34ch}

  .fcol .lbl{font-family:ui-monospace,"SF Mono",SFMono-Regular,Menlo,monospace;
    font-size:11px;font-weight:500;letter-spacing:.18em;text-transform:uppercase;
    color:var(--faint);margin-bottom:16px}
  .fcol ul{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:11px}
  .fcol a{font-size:14px;line-height:1.5;color:var(--mist);text-decoration:none;
    transition:color .3s var(--ease)}
  .fcol a:hover{color:var(--ink);transition-duration:.15s}

  .foot-bar{margin-top:56px;padding-top:22px;border-top:1px solid var(--stroke);
    display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px}
  .foot-bar .legal{display:flex;align-items:center;flex-wrap:wrap;gap:6px 18px;
    font-size:13px;color:var(--faint)}
  .foot-bar .legal a{color:var(--faint);text-decoration:none}
  .foot-bar .legal a:hover{color:var(--ink)}
  /* theme toggle — segmented pill, same field grammar as the nav
     pill. Wiring is 3 lines of JS: set data-theme on <html>,
     persist to localStorage. Without JS it simply follows the OS. */
  .theme{display:inline-flex;align-items:center;padding:3px;border-radius:999px;
    background:var(--glass);border:1px solid var(--stroke)}
  .theme button{font:inherit;font-size:12.5px;font-weight:500;color:var(--mist);
    background:none;border:none;border-radius:999px;padding:6px 13px;cursor:pointer;
    transition:color .3s var(--ease),background-color .3s var(--ease)}
  .theme button:hover{color:var(--ink)}
  .theme button[aria-pressed="true"]{color:var(--ink);background:var(--wash);
    box-shadow:inset 0 1px 0 var(--glass-inner)}

  /* ── reduced motion ─────────────────────────────────────── */
  @media (prefers-reduced-motion: reduce){
    html{scroll-behavior:auto}
    .live{animation:none}
    .btn,.btn::before,.cta-call,.cta-call::before,.navnum,.theme button,
    nav.primary > a,nav.primary summary,details.menu .car,.drawer .car,
    .toc a,.fcol a,.mega-links a,.skip{
      transition-property:box-shadow,border-color,color,background-color,opacity}
    .btn:active,.cta-call:hover,.cta-call:active{transform:none}
  }

/* Language switcher — reuses .menu/.mega chrome; small pill in head-actions. */
.langpick{position:relative}
.langpick>summary{display:inline-flex;align-items:center;gap:6px;cursor:pointer;
  padding:6px 10px;border-radius:9px;color:var(--mist);font-weight:600;font-size:13px;
  list-style:none}
.langpick>summary::-webkit-details-marker{display:none}
.langpick>summary:hover{color:var(--ink);background:var(--wash)}
.langpick[open]>summary{color:var(--ink);background:var(--wash)}
.langpick .langlabel{letter-spacing:.02em}
.langmenu{width:min(200px,calc(100vw - 32px));right:0;left:auto;padding:8px;
  /* SOLID, opaque background — this dropdown sits over the busy hero, so the
     translucent glass made the text bleed through. Fully readable now. */
  background:var(--dawn);
  border:1px solid var(--stroke);
  box-shadow:0 20px 44px -20px var(--shadow-deep),0 8px 20px -12px var(--shadow),0 0 0 1px var(--glass-under);
  -webkit-backdrop-filter:none;backdrop-filter:none;}
.langmenu::before,.langmenu::after{display:none} /* kill the glass overlays */
.langmenu a{display:block;padding:10px 13px;border-radius:9px;color:var(--ink);
  text-decoration:none;font-weight:500;font-size:15px}
.langmenu a:hover{background:var(--wash)}
@media (max-width:880px){ .langpick{display:none} }

/* ═══════════════════════════════════════════════════════════
   aai design system · page sections (ext:)
   Styles for the approved homepage markup (hero + demos +
   strip + steps + features + why + CTA). Extensions only —
   every value derives from the shared tokens above; no new
   colors, no new voices. The section markup itself is the
   approved home body, reused verbatim by the SSG.
   ═══════════════════════════════════════════════════════════ */

/* ── hero (the landing's <header>, worn as a <section> so the
      one <header> landmark on every page is the site chrome) ── */
.hero{position:relative;padding:104px 0 0}
.hero .rings{position:absolute;left:50%;top:-46%;transform:translateX(-50%);
  width:min(1240px,170vw);aspect-ratio:1;pointer-events:none;z-index:-1;opacity:.9;
  background:repeating-radial-gradient(circle at center,
    var(--ring-line) 0 1px, transparent 1px 96px);
  -webkit-mask-image:radial-gradient(circle at center, black 22%, transparent 62%);
  mask-image:radial-gradient(circle at center, black 22%, transparent 62%)}
.hero-inner{position:relative;max-width:860px}
.eyebrow{display:inline-flex;align-items:center;gap:9px;padding:8px 16px;border-radius:999px;
  background:var(--glass);border:1px solid var(--stroke);
  -webkit-backdrop-filter:blur(14px) saturate(160%);backdrop-filter:blur(14px) saturate(160%);
  font-family:ui-monospace,"SF Mono",SFMono-Regular,Menlo,monospace;
  font-size:11px;font-weight:500;letter-spacing:.16em;text-transform:uppercase;
  color:var(--mist);margin-bottom:28px}
.hero h1{font-size:clamp(38px,5.4vw,60px);font-weight:650;line-height:1.04;
  letter-spacing:-.032em;max-width:17ch}
.hero .em{color:var(--spruce)}
.hero .lede{margin-top:20px;font-size:clamp(16.5px,2vw,19.5px);line-height:1.6;
  color:var(--mist);max-width:54ch}

/* ── the two demos: call it / have it call me ── */
.demos{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;
  margin-top:46px;max-width:900px}
.demo{padding:26px 26px 24px;display:flex;flex-direction:column}
.demo>*{position:relative;z-index:3} /* above the glass edge/grain layers */
.demo .lbl{font-family:ui-monospace,"SF Mono",SFMono-Regular,Menlo,monospace;
  font-size:11px;font-weight:500;letter-spacing:.18em;text-transform:uppercase;
  color:var(--spruce);margin-bottom:10px}
.demo .sm{font-size:14.5px;line-height:1.6;color:var(--mist)}
.demo .foot{margin-top:22px}
.callbtn{width:100%;font-size:16px}
.callbtn svg{width:18px;height:18px;flex:none}
.tiny{margin-top:12px;font-size:12px;line-height:1.55;color:var(--faint)}

/* the native call-me form — no JS, POSTs to /api/call-me */
.callme{display:flex;gap:10px}
.telfield{flex:1;min-width:0;display:flex;align-items:center;border-radius:14px;
  background:var(--glass);border:1px solid var(--stroke);
  -webkit-backdrop-filter:blur(14px) saturate(160%);backdrop-filter:blur(14px) saturate(160%);
  transition:border-color .3s var(--ease),box-shadow .3s var(--ease)}
.telfield:focus-within{border-color:var(--spruce);box-shadow:0 0 0 3px var(--focus-ring)}
.telfield .cc{padding-left:14px;font-size:15px;color:var(--faint)}
.telfield input{flex:1;min-width:0;height:46px;padding:0 12px 0 7px;border:none;
  background:none;font:inherit;font-size:15px;color:var(--ink);outline:none}
.telfield input::placeholder{color:var(--faint)}
@media (max-width:1000px) and (min-width:881px){.callme{flex-direction:column}}
@media (max-width:460px){.callme{flex-direction:column}}

/* ── proof strip ── */
.strip{margin-top:36px}
.strip .bar{display:flex;flex-wrap:wrap;gap:10px 30px;justify-content:center;
  padding:16px 26px;border-radius:18px;font-size:14px;color:var(--mist)}
.strip .bar>span{position:relative;z-index:3;display:inline-flex;align-items:center;gap:8px}
.ck{color:var(--spruce);font-weight:700;font-size:13px}

/* ── section rhythm ── */
main>section{padding:96px 0 0}
main>section h2{font-size:clamp(26px,3.5vw,38px);line-height:1.12}
.centered{text-align:center}
.sec-lede{margin-top:16px;font-size:16.5px;line-height:1.65;color:var(--mist);max-width:58ch}
.centered .sec-lede,.cta .sec-lede{margin-left:auto;margin-right:auto}

/* ── how it works ── */
.steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;
  margin-top:44px;text-align:left}
.step{padding:26px}
.step>*{position:relative;z-index:3}
.step .no{font-family:ui-serif,"New York",Georgia,serif;font-style:italic;
  font-size:22px;line-height:1;color:var(--spruce);margin-bottom:16px}
.step h3{font-size:17.5px;letter-spacing:-.015em;margin-bottom:8px}
.step p{font-size:14.5px;line-height:1.65;color:var(--mist)}

/* ── features: one pane, hairline-divided ── */
.feats{margin-top:44px;display:grid;grid-template-columns:repeat(3,minmax(0,1fr));
  border-radius:24px;overflow:hidden}
.feat{position:relative;z-index:3;padding:26px;box-shadow:inset 0 0 0 .5px var(--stroke)}
.feat h3{display:flex;align-items:center;gap:10px;font-size:16px;
  letter-spacing:-.015em;margin-bottom:10px}
.feat h3 svg{width:20px;height:20px;color:var(--spruce);flex:none}
.feat p{font-size:14px;line-height:1.65;color:var(--mist)}

/* ── why aai ── */
.why{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:start}
.why ul{list-style:none;margin:26px 0 0;padding:0;display:flex;flex-direction:column;gap:16px}
.why li{display:flex;gap:12px;font-size:15.5px;line-height:1.6;color:var(--mist)}
.why li b{color:var(--ink);font-weight:600}
.quote{padding:30px 32px}
.quote>*{position:relative;z-index:3}
.quote .q{font-family:ui-serif,"New York",Georgia,serif;font-style:italic;
  font-size:20px;line-height:1.5;letter-spacing:-.01em;color:var(--ink)}
.quote .a{margin-top:12px;font-size:13.5px;color:var(--mist)}

/* ── closing CTA ── */
.cta{text-align:center}
.cta .cta-call{margin-top:34px}

@media (max-width:880px){
  .demos{grid-template-columns:1fr;max-width:560px}
  .steps{grid-template-columns:1fr}
  .feats{grid-template-columns:repeat(2,minmax(0,1fr))}
  .why{grid-template-columns:1fr;gap:36px}
  main>section{padding:76px 0 0}
}
@media (max-width:560px){.feats{grid-template-columns:1fr}}

/* ── ext: hub card grid (industries / guides index pages) —
      the .step/.feat grammar applied to link-able cards. Tokens only. ── */
.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.card{display:flex;flex-direction:column;padding:26px;text-decoration:none;
  transition:transform .3s var(--ease)}
.card>*{position:relative;z-index:3}
.card h3{font-size:17px;letter-spacing:-.015em;line-height:1.35;margin-bottom:10px;color:var(--ink)}
.card p{font-size:14px;line-height:1.65;color:var(--mist)}
.card p.muted{color:var(--faint)}
.card .go{margin-top:auto;padding-top:16px;font-size:13.5px;font-weight:600;color:var(--spruce)}
a.card:hover{transform:translateY(-2px)}
a.card:hover .go{text-decoration:underline;text-underline-offset:3px}
@media (max-width:880px){.cards{grid-template-columns:1fr}}

/* hub pages have no toc rail — .solo keeps the connective prose on the
   same 65ch measure the page-grid articles use */
.prose.solo{max-width:65ch;margin-top:64px}

/* ── ext: /news + /docs section trims. Tokens only. ── */
/* date/kicker line atop a /news index card */
.card .when{font-family:ui-monospace,"SF Mono",SFMono-Regular,Menlo,monospace;
  font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--faint);
  margin-bottom:10px}
/* byline row opening a news post's prose — org + date, no invented humans */
.prose .byline{font-family:ui-monospace,"SF Mono",SFMono-Regular,Menlo,monospace;
  font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--faint)}
/* second rail list on /docs pages ("All docs" under "On this page") */
.toc ol+.lbl{margin-top:28px}

/* ── ext: /call-result shell — the centered status card the Worker fills
      in. Kind class ("ok" / "error") comes from {{RESULT_KIND}}; the error
      state's amber is the one scoped color the tokens don't carry. ── */
.result-wrap{display:flex;justify-content:center;padding:110px 24px 0}
.result-card{--warn:#B4832F;max-width:480px;width:100%;padding:46px 36px 40px;text-align:center}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]) .result-card{--warn:#E3B664}}
:root[data-theme="dark"] .result-card{--warn:#E3B664}
.result-card>*{position:relative;z-index:3}
.result-mark{width:56px;height:56px;margin:0 auto 22px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  background:var(--glass);border:1px solid var(--stroke)}
.result-mark svg{width:26px;height:26px;display:none}
.result-card.ok .mark-ok{display:block;color:var(--spruce)}
.result-card.error .mark-err{display:block;color:var(--warn)}
.result-card.error .result-mark{border-color:var(--warn)}
.result-title{font-size:23px;font-weight:650;letter-spacing:-.025em;line-height:1.3;
  margin-bottom:12px;text-wrap:balance}
.result-sub{font-size:14.5px;line-height:1.6;color:var(--mist);margin-bottom:26px}
.result-home{display:block;margin-top:20px;font-size:13.5px;color:var(--mist);
  text-decoration:none;transition:color .3s var(--ease)}
.result-home:hover{color:var(--ink);transition-duration:.15s}