:root{
    --bg:#f6f7f9;--surface:#ffffff;--surface-2:#fbfbfd;--line:#e6e8ec;--line-strong:#d6d9df;
    --ink:#0e1116;--ink-soft:#5b626e;--ink-muted:#9aa1ad;
    --brand:#4f46e5;--brand-2:#6366f1;--brand-soft:#eef0ff;
    --ok:#0f9d58;--ok-soft:#e7f6ee;--warn:#c2710c;--warn-soft:#fbf0e0;
    --radius:14px;--shadow-sm:0 1px 2px rgba(16,17,22,.05),0 1px 3px rgba(16,17,22,.04);
    --shadow-md:0 4px 12px rgba(16,17,22,.06),0 12px 28px rgba(16,17,22,.07);
    --font:-apple-system,BlinkMacSystemFont,"Inter","Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  }
  html[data-theme="dark"]{
    --bg:#0b0d10;--surface:#13161b;--surface-2:#0f1216;--line:#262b33;--line-strong:#333a45;
    --ink:#eef1f5;--ink-soft:#a4adba;--ink-muted:#6c7480;
    --brand:#7c83ff;--brand-2:#8b91ff;--brand-soft:#1b1f3a;
    --ok:#41c98a;--ok-soft:#10271d;--warn:#e2a44a;--warn-soft:#2a2113;
    --shadow-sm:0 1px 2px rgba(0,0,0,.4);--shadow-md:0 8px 30px rgba(0,0,0,.5);
  }
  *{box-sizing:border-box;margin:0;padding:0}
  body{font-family:var(--font);background:var(--bg);color:var(--ink);-webkit-font-smoothing:antialiased;line-height:1.55;letter-spacing:-.01em;-webkit-user-select:none;user-select:none;overflow-x:hidden}
  input,textarea,select{-webkit-user-select:text;user-select:text}
  a{color:inherit;text-decoration:none}
  .wrap{max-width:1080px;margin:0 auto;padding:0 22px}
  .topbar{height:62px;display:flex;align-items:center;gap:14px;border-bottom:1px solid var(--line);background:color-mix(in srgb,var(--surface) 88%,transparent);position:sticky;top:0;z-index:20;backdrop-filter:saturate(140%) blur(8px)}
  .brand{display:flex;align-items:center;gap:11px;font-weight:750;font-size:15.5px}
  .logo{width:30px;height:30px;border-radius:9px;background:linear-gradient(135deg,var(--brand),var(--brand-2));display:grid;place-items:center;color:#fff;box-shadow:var(--shadow-sm)}
  .logo svg{width:17px;height:17px}
  .pill{font-size:11px;font-weight:700;color:#1d4ed8;background:#e7effe;padding:3px 9px;border-radius:999px;border:1px solid #bcd3fb}
  html[data-theme="dark"] .pill{color:#93b4ff;background:#16233f;border-color:#274777}
  .spacer{flex:1}
  .icon-btn{width:36px;height:36px;border-radius:9px;border:1px solid var(--line);background:var(--surface);color:var(--ink-soft);display:grid;place-items:center;cursor:pointer}
  .icon-btn:hover{border-color:var(--line-strong);color:var(--ink)}
  .icon-btn svg{width:17px;height:17px}
  .lang-sw{display:inline-flex;border:1px solid var(--line);border-radius:9px;overflow:hidden;height:36px}
  .lang-sw a{padding:0 11px;display:grid;place-items:center;font-size:12.5px;font-weight:700;color:var(--ink-soft);background:var(--surface)}
  .lang-sw a+a{border-left:1px solid var(--line)}
  .lang-sw a:hover{color:var(--ink)}
  .lang-sw a.on{background:var(--brand);color:#fff}
  .btn{height:38px;padding:0 16px;border-radius:10px;border:1px solid var(--line);background:var(--surface);color:var(--ink);font-weight:650;font-size:13.5px;display:inline-flex;align-items:center;gap:8px;cursor:pointer;font-family:var(--font)}
  .btn:hover{border-color:var(--line-strong)}
  .btn svg{width:16px;height:16px}
  .btn.primary{background:linear-gradient(180deg,var(--brand-2),var(--brand));color:#fff;border:none;box-shadow:0 1px 2px rgba(79,70,229,.4),inset 0 1px 0 rgba(255,255,255,.18)}
  .btn.primary:hover{filter:brightness(1.05)}
  .btn.ghost{background:transparent;border-color:transparent;color:var(--ink-soft);font-weight:600}
  .btn.ghost:hover{background:var(--surface);border-color:var(--line);color:var(--ink)}
  .hero{padding:70px 0 54px;text-align:center;position:relative;overflow:hidden}
  .hero::after{content:"";position:absolute;inset:0;pointer-events:none;z-index:0;background:radial-gradient(60% 70% at 50% -10%,color-mix(in srgb,var(--brand-2) 16%,transparent),transparent 70%)}
  .hero>*{position:relative;z-index:1}
  .hbadge{display:inline-flex;align-items:center;gap:7px;font-size:12px;font-weight:700;color:var(--brand);background:var(--brand-soft);padding:5px 12px;border-radius:999px;border:1px solid color-mix(in srgb,var(--brand) 22%,transparent)}
  .hbadge svg{width:14px;height:14px}
  .hero h1{font-size:42px;line-height:1.1;font-weight:820;letter-spacing:-.03em;margin:18px auto 14px;max-width:18ch}
  .hero p.sub{font-size:17px;color:var(--ink-soft);max-width:60ch;margin:0 auto}
  .cta-row{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:28px}
  .cta-row .btn{height:46px;padding:0 22px;font-size:15px}
  .cta-note{margin-top:12px;font-size:13.5px;font-weight:600;color:var(--ink-soft)}
  .trust{margin-top:8px;font-size:12.5px;color:var(--ink-muted)}
  section.blk{padding:46px 0;border-top:1px solid var(--line)}
  .sec-h{text-align:center;margin-bottom:30px}
  .sec-h h2{font-size:27px;font-weight:780;letter-spacing:-.02em}
  .sec-h p{color:var(--ink-soft);margin-top:8px;font-size:14.5px}
  .steps{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
  .step{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow-sm)}
  .step .n{width:34px;height:34px;border-radius:9px;background:var(--brand-soft);color:var(--brand);font-weight:800;display:grid;place-items:center;margin-bottom:13px}
  .step h3{font-size:16px;font-weight:700;margin-bottom:6px}
  .step p{font-size:13.5px;color:var(--ink-soft)}
  .grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
  .feat{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow-sm)}
  .feat .fic{width:38px;height:38px;border-radius:10px;background:var(--brand-soft);color:var(--brand);display:grid;place-items:center;margin-bottom:12px}
  .feat .fic svg{width:19px;height:19px}
  .feat h3{font-size:15.5px;font-weight:700;margin-bottom:5px}
  .feat p{font-size:13px;color:var(--ink-soft)}
  /* Designer / Digital Twin showcase */
  .sec-h .pro{display:inline-block;margin-top:12px;font-size:11px;font-weight:800;letter-spacing:.05em;text-transform:uppercase;color:var(--brand);background:var(--brand-soft);border:1px solid color-mix(in srgb,var(--brand) 30%,transparent);border-radius:999px;padding:5px 13px}
  .shot{margin:0;border:1px solid var(--line);border-radius:var(--radius);background:var(--surface-2);box-shadow:var(--shadow-md);overflow:hidden}
  .shot img{display:block;width:100%;height:auto}
  .shot img.shot-dark{display:none}
  [data-theme="dark"] .shot img.shot-light{display:none}
  [data-theme="dark"] .shot img.shot-dark{display:block}
  .shot figcaption{padding:9px 14px;border-top:1px solid var(--line);background:var(--surface);font-size:12px;font-weight:700;letter-spacing:.02em;color:var(--ink-muted);text-align:center}
  .showcase{display:grid;grid-template-columns:minmax(0,1.55fr) 1fr;gap:26px;align-items:center}
  .shot.split{margin-bottom:22px}
  .twin-shots{display:grid;grid-template-columns:1fr 1fr;gap:22px;align-items:start}
  .shot.tall img{max-height:420px;object-fit:contain;background:var(--surface-2)}
  .pts{list-style:none;display:grid;gap:12px;margin:0;padding:0}
  .pts.wide{grid-template-columns:1fr 1fr;margin-top:26px;gap:12px 24px}
  .pts li{font-size:13.5px;color:var(--ink-soft);line-height:1.5;padding-left:20px;position:relative}
  .pts li::before{content:"";position:absolute;left:0;top:7px;width:9px;height:9px;border-radius:3px;background:var(--brand)}
  .pts li b{color:var(--ink);font-weight:700;display:block;font-size:14px;margin-bottom:1px}
  .formats{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
  .fmt{font-size:12.5px;font-weight:700;letter-spacing:.03em;color:var(--ink-soft);background:var(--surface);border:1px solid var(--line);border-radius:9px;padding:9px 15px;box-shadow:var(--shadow-sm)}
  .privacy{display:flex;gap:18px;align-items:flex-start;background:var(--ok-soft);border:1px solid color-mix(in srgb,var(--ok) 28%,transparent);border-radius:var(--radius);padding:24px}
  .privacy .pic{width:42px;height:42px;flex:none;border-radius:11px;background:color-mix(in srgb,var(--ok) 18%,transparent);color:var(--ok);display:grid;place-items:center}
  .privacy .pic svg{width:22px;height:22px}
  .privacy h3{font-size:16.5px;font-weight:750;margin-bottom:6px}
  .privacy p{font-size:13.5px;color:var(--ink-soft)}
  .final{text-align:center;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:42px 22px;box-shadow:var(--shadow-md)}
  .final h2{font-size:26px;font-weight:800;letter-spacing:-.02em}
  .final p{color:var(--ink-soft);margin:9px auto 22px;max-width:48ch;font-size:14.5px}
  footer{border-top:1px solid var(--line);padding:26px 0;color:var(--ink-muted);font-size:12.5px;display:flex;gap:12px;align-items:center;flex-wrap:wrap;justify-content:center}
  footer a:hover{color:var(--ink)}
  /* problem / value */
  .value{display:grid;grid-template-columns:1fr 1fr;gap:18px;align-items:stretch}
  .vcard{border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow-sm)}
  .vcard.bad{border-color:color-mix(in srgb,var(--warn) 32%,transparent);background:color-mix(in srgb,var(--warn-soft) 55%,var(--surface))}
  .vcard.good{border-color:color-mix(in srgb,var(--ok) 32%,transparent);background:color-mix(in srgb,var(--ok-soft) 55%,var(--surface))}
  .vcard h3{font-size:16px;font-weight:760;margin-bottom:14px;display:flex;align-items:center;gap:9px}
  .vcard h3 svg{width:19px;height:19px}
  .vcard.bad h3{color:var(--warn)}.vcard.good h3{color:var(--ok)}
  .vcard ul{list-style:none;display:flex;flex-direction:column;gap:10px}
  .vcard li{font-size:13.5px;color:var(--ink-soft);display:flex;gap:9px;align-items:flex-start}
  .vcard li svg{width:16px;height:16px;flex:none;margin-top:1px}
  .vcard.bad li svg{color:var(--warn)}.vcard.good li svg{color:var(--ok)}
  /* showcase: real tool screenshots, code -> diagram */
  .show{display:grid;grid-template-columns:minmax(0,.92fr) minmax(0,1.08fr);border:1px solid var(--line);border-radius:16px;overflow:hidden;box-shadow:var(--shadow-md);background:var(--surface)}
  .sc-pane{height:clamp(360px,46vw,520px);min-width:0}
  .sc-code{background:var(--surface-2);border-right:1px solid var(--line);overflow:auto}
  .sc-diag{background:var(--surface);display:grid;place-items:center;padding:18px}
  .sc-img{display:block}
  .sc-code .sc-img{width:100%;height:auto}
  .sc-diag .sc-img{max-width:100%;max-height:100%;width:auto;height:auto;border-radius:8px}
  .sc-img.sc-dark{display:none}
  html[data-theme="dark"] .sc-img.sc-light{display:none}
  html[data-theme="dark"] .sc-img.sc-dark{display:block}
  .show .cap{grid-column:1/-1;border-top:1px solid var(--line);background:var(--surface-2);padding:11px 16px;font-size:12px;color:var(--ink-muted);display:flex;gap:8px;align-items:center;flex-wrap:wrap}
  .show .cap b{color:var(--ink-soft);font-weight:700}
  /* staged reveal: code slides in, diagram follows */
  .sc-code,.sc-diag{opacity:0;transition:opacity .7s ease,transform .7s ease}
  .sc-code{transform:translateX(-16px)}
  .sc-diag{transform:translateX(16px) scale(.985);transition-delay:.18s}
  .show.in .sc-code,.show.in .sc-diag{opacity:1;transform:none}
  /* notify / waitlist */
  .notify-card{display:grid;grid-template-columns:1.05fr .95fr;gap:28px;align-items:center;background:linear-gradient(135deg,color-mix(in srgb,var(--brand) 11%,var(--surface)),var(--surface) 70%);border:1px solid color-mix(in srgb,var(--brand) 26%,transparent);border-radius:18px;padding:34px;box-shadow:var(--shadow-md)}
  .notify-card h2{font-size:25px;font-weight:820;letter-spacing:-.02em;margin:14px 0 8px}
  .notify-card p{color:var(--ink-soft);font-size:14px;max-width:46ch}
  .nc-form{width:100%}
  .field-row{display:flex;gap:10px;flex-wrap:wrap}
  .field-row input[type=email]{flex:1;min-width:190px;height:48px;padding:0 15px;border-radius:11px;border:1px solid var(--line-strong);background:var(--surface);color:var(--ink);font-size:14.5px;font-family:var(--font)}
  .field-row input[type=email]:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-soft)}
  .field-row .btn{height:48px;padding:0 24px;font-size:14.5px}
  .nc-msg{font-size:13px;margin-top:11px;min-height:18px}
  .nc-msg.ok{color:var(--ok)}.nc-msg.err{color:var(--warn)}
  .nc-fine{font-size:11.5px;color:var(--ink-muted);margin-top:9px}
  .hp{position:absolute;left:-9999px;top:-9999px;width:1px;height:1px;overflow:hidden}
  /* request beta access form */
  .nc-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px}
  .nc-grid .full{grid-column:1/-1}
  .nc-field label{display:block;font-size:12px;font-weight:650;color:var(--ink-soft);margin-bottom:5px}
  .nc-field label .req{color:var(--brand);font-weight:700}
  .nc-input{width:100%;height:46px;padding:0 14px;border-radius:11px;border:1px solid var(--line-strong);background:var(--surface);color:var(--ink);font-size:14px;font-family:var(--font)}
  textarea.nc-input{height:auto;min-height:78px;padding:11px 14px;resize:vertical;line-height:1.5}
  .nc-input:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px var(--brand-soft)}
  .nc-form .btn.primary{margin-top:13px}
  .nc-actions{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
  .nc-actions .btn.primary{margin-top:13px}
  .nc-actions .btn:not(.primary){margin-top:13px}
  .req-collapsed{display:none}
  /* confirmation modal */
  .req-modal{position:fixed;inset:0;z-index:90;display:flex;align-items:center;justify-content:center;padding:22px;background:rgba(8,11,16,.55);backdrop-filter:blur(3px);animation:reqFade .2s ease}
  .req-modal[hidden]{display:none}
  .req-modal-card{background:var(--surface);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow-md);max-width:420px;width:100%;padding:32px 28px;text-align:center;animation:reqPop .24s cubic-bezier(.2,.8,.3,1)}
  .req-modal-ico{width:54px;height:54px;margin:0 auto 16px;border-radius:50%;display:grid;place-items:center;background:color-mix(in srgb,var(--ok) 16%,transparent);color:var(--ok)}
  .req-modal-ico svg{width:28px;height:28px}
  .req-modal-card h3{font-size:21px;font-weight:800;letter-spacing:-.02em;margin:0 0 8px}
  .req-modal-card p{color:var(--ink-soft);font-size:14px;line-height:1.55;margin:0 0 20px}
  .req-modal-card .btn{width:100%;justify-content:center}

  .zs-badge{display:inline-flex;align-items:center;gap:6px;font-size:11px;font-weight:700;color:var(--ok);background:var(--ok-soft);padding:4px 11px 4px 9px;border-radius:999px;border:1px solid color-mix(in srgb,var(--ok) 32%,transparent);white-space:nowrap;cursor:pointer;font-family:var(--font);animation:zsPulse 2.6s ease-in-out infinite}
  .zs-badge:hover{background:color-mix(in srgb,var(--ok) 16%,var(--surface));border-color:color-mix(in srgb,var(--ok) 55%,transparent)}
  .zs-badge:focus-visible{outline:2px solid var(--ok);outline-offset:2px}
  .zs-badge .zs-shield{display:grid;place-items:center;width:15px;height:15px;flex:none}
  .zs-badge .zs-shield svg{width:15px;height:15px}
  @keyframes zsPulse{0%,100%{box-shadow:0 0 0 0 color-mix(in srgb,var(--ok) 40%,transparent)}50%{box-shadow:0 0 0 4px color-mix(in srgb,var(--ok) 0%,transparent)}}
  @media (prefers-reduced-motion:reduce){.zs-badge{animation:none}}
  @media (max-width:640px){.zs-badge .zs-lbl{display:none}.zs-badge{padding:5px}}
  /* Topbar responsiveness: keep the brand on the left and the actions on the
     right, trimming decorative chrome / button labels progressively so nothing
     clips on tablet (portrait or landscape) or phone widths. */
  .topbar .btn,.topbar .brand{flex:none}
  .brand-txt{white-space:nowrap}
  @media(max-width:900px){
    .topbar .wrap{gap:10px}
    .topbar .pill{display:none}
    .topbar .btn{padding:0 12px}
    .topbar .btn>span{display:none}
  }
  @media(max-width:420px){
    .topbar .wrap{gap:8px}
    .brand-txt{display:none}
  }
  .zs-overlay{position:fixed;inset:0;z-index:95;display:none;align-items:center;justify-content:center;padding:22px;background:rgba(8,11,16,.55);backdrop-filter:blur(3px)}
  .zs-overlay.open{display:flex;animation:reqFade .2s ease}
  .zs-modal-card{background:var(--surface);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow-md);max-width:560px;width:100%;max-height:86vh;overflow:auto;animation:reqPop .24s cubic-bezier(.2,.8,.3,1)}
  .zs-modal-head{display:flex;align-items:center;gap:11px;padding:20px 22px 14px;border-bottom:1px solid var(--line)}
  .zs-modal-head h3{font-size:18px;font-weight:800;letter-spacing:-.02em;margin:0;flex:1}
  .zs-head-ic{display:grid;place-items:center;width:32px;height:32px;flex:none;border-radius:9px;color:var(--ok);background:var(--ok-soft)}
  .zs-head-ic svg{width:18px;height:18px}
  .zs-x{flex:none;width:30px;height:30px;border:none;border-radius:8px;background:transparent;color:var(--ink-muted);font-size:16px;line-height:1;cursor:pointer}
  .zs-x:hover{background:var(--surface-2);color:var(--ink)}
  .zs-modal-body{padding:18px 22px 22px;font-size:14px;color:var(--ink);line-height:1.6}
  .zs-modal-body>p{margin:0 0 4px;color:var(--ink-soft)}
  .zs-list{margin:12px 0 0;padding-left:20px;display:flex;flex-direction:column;gap:10px}
  .zs-list li{line-height:1.55}
  .zs-verify{margin-top:16px;padding:12px 14px;border-radius:10px;font-size:13px;line-height:1.55;color:var(--ink);background:var(--ok-soft);border:1px solid color-mix(in srgb,var(--ok) 30%,transparent)}
  @keyframes reqFade{from{opacity:0}to{opacity:1}}
  @keyframes reqPop{from{opacity:0;transform:translateY(10px) scale(.97)}to{opacity:1;transform:none}}
  /* reveal on scroll */
  .reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
  .reveal.in{opacity:1;transform:none}
  @media(max-width:780px){
    .steps,.grid,.value{grid-template-columns:1fr}.hero h1{font-size:32px}
    .showcase,.twin-shots,.pts.wide{grid-template-columns:1fr}
    .show{grid-template-columns:1fr}
    .sc-code{border-right:none;border-bottom:1px solid var(--line)}
    .sc-pane{height:auto;max-height:62vh}
    .notify-card{grid-template-columns:1fr;padding:26px}
    .nc-grid{grid-template-columns:1fr}
  }
  @media (prefers-reduced-motion: reduce){
    .reveal{opacity:1;transform:none;transition:none}
    .sc-code,.sc-diag{opacity:1;transform:none;transition:none}
  }
  /* interactive demo */
  .demo{border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);box-shadow:var(--shadow-md);overflow:hidden}
  .demo-tabs{display:flex;gap:6px;padding:14px 16px 0;flex-wrap:wrap;background:var(--surface-2);border-bottom:1px solid var(--line)}
  .demo-tab{appearance:none;border:1px solid var(--line);border-bottom:none;background:var(--surface-2);color:var(--ink-soft);font-family:var(--font);font-weight:650;font-size:13px;padding:9px 15px;border-radius:10px 10px 0 0;cursor:pointer;margin-bottom:-1px}
  .demo-tab:hover{color:var(--ink)}
  .demo-tab.on{background:var(--surface);color:var(--ink);border-bottom:1px solid var(--surface)}
  /* the dynamic (interactive) demo tab stands out from the static ones */
  .demo-tab[data-isolate]{color:#0ea5e9;border-color:#38bdf8;background:rgba(14,165,233,.10)}
  .demo-tab[data-isolate]:hover{color:#0284c7}
  .demo-tab[data-isolate].on{color:#0ea5e9;background:var(--surface);border-bottom-color:var(--surface)}
  .demo-tab-badge{margin-left:7px;font-size:9px;font-weight:800;letter-spacing:.4px;text-transform:uppercase;color:#fff;background:#0ea5e9;padding:2px 7px;border-radius:999px;vertical-align:middle}
  .demo-blurb{padding:14px 18px 0;color:var(--ink-soft);font-size:13.5px;margin:0}
  .demo-body{display:grid;grid-template-columns:minmax(0,480px) 1fr;padding:16px 18px 18px}
  .demo-code,.demo-diagram{border:1px solid var(--line);background:var(--surface-2);display:flex;flex-direction:column;min-width:0}
  .demo-code{border-right:none;border-radius:12px 0 0 12px;container-type:inline-size}
  .demo-diagram{border-radius:0 12px 12px 0}
  .demo-pane-h{display:flex;align-items:center;gap:8px;padding:9px 12px;border-bottom:1px solid var(--line);background:var(--surface);min-height:44px}
  .demo-fname{margin-left:6px;font-size:12px;color:var(--ink-muted);font-family:ui-monospace,monospace}
  .demo-src{display:none;margin:0;padding:14px;overflow:auto;max-height:480px;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:clamp(8px,2cqi,12px);line-height:1.55;color:var(--ink);white-space:pre;tab-size:4}
  .demo-src.on{display:block}
  .demo-seg{display:inline-flex;border:1px solid var(--line);border-radius:9px;overflow:hidden}
  .demo-seg-btn{appearance:none;border:none;background:var(--surface);color:var(--ink-soft);font-family:var(--font);font-weight:650;font-size:12.5px;padding:7px 14px;cursor:pointer}
  .demo-seg-btn+.demo-seg-btn{border-left:1px solid var(--line)}
  .demo-seg-btn.on{background:var(--brand);color:#fff}
  .demo-hint{margin-left:auto;font-size:11.5px;color:var(--ink-muted)}
  .demo-canvas{flex:1;min-height:380px;max-height:560px;overflow:auto;padding:14px;display:flex;align-items:center;justify-content:center;background:var(--surface-2);transition:opacity .15s}
  .demo-canvas.loading{opacity:.4}
  .demo-canvas svg{max-width:100%;max-height:520px}
  /* spotlight (path isolation) on the conveyor demo tab */
  .demo-canvas svg [data-el]{transition:opacity .18s ease-in-out}
  .demo-canvas.interactive svg [data-el]{cursor:pointer}
  .demo-canvas.isolate svg [data-el]:not(.iso-on){opacity:.12}
  .demo-canvas.isolate svg [data-el="edge"].iso-on[stroke]:not([stroke="none"]){stroke-width:3px}
  .demo-spot{display:none;align-items:center;gap:6px;margin-left:10px;font-size:11.5px;font-weight:680;color:#0ea5e9;background:var(--surface-2);border:1px solid #38bdf8;padding:3px 10px;border-radius:999px}
  .demo-spot.on{display:inline-flex}
  .demo-spot .dot{width:6px;height:6px;border-radius:50%;background:#0ea5e9;animation:spotPulse 1.4s ease-in-out infinite}
  @keyframes spotPulse{0%,100%{opacity:.35;transform:scale(.8)}50%{opacity:1;transform:scale(1.2)}}
  @media (prefers-reduced-motion: reduce){.demo-spot .dot{animation:none}}
  .demo .cap{border-top:1px solid var(--line);background:var(--surface-2);padding:11px 18px;font-size:12px;line-height:1.5;color:var(--ink-muted)}
  .demo .cap b{color:var(--ink-soft);font-weight:700}
  /* faq */
  .faq{max-width:760px;margin:0 auto;display:flex;flex-direction:column;gap:10px}
  .faq-item{border:1px solid var(--line);border-radius:12px;background:var(--surface);box-shadow:var(--shadow-sm);overflow:hidden}
  .faq-item summary{list-style:none;cursor:pointer;padding:16px 18px;font-weight:680;font-size:15px;display:flex;align-items:center;justify-content:space-between;gap:12px;color:var(--ink)}
  .faq-item summary::-webkit-details-marker{display:none}
  .faq-item summary svg{width:18px;height:18px;flex:none;color:var(--ink-muted);transition:transform .2s}
  .faq-item[open] summary svg{transform:rotate(180deg)}
  .faq-a{padding:0 18px 16px;color:var(--ink-soft);font-size:14px;line-height:1.6}
  @media(max-width:780px){
    .demo-body{grid-template-columns:1fr}
    .demo-code{border-right:1px solid var(--line);border-radius:12px 12px 0 0}
    .demo-diagram{border-top:none;border-radius:0 0 12px 12px}
  }