:root{
    --bg:#f4f6f8; --card:#ffffff; --inset:#eef1f4;
    --ink:#171b21; --muted:#5d6673; --faint:#98a0ab;
    --border:#e2e6eb; --border2:#d3d9e0;
    --accent:#5852d6; --on-accent:#ffffff; --accent-soft:rgba(88,82,214,.08);
    --ok:#177a3d;
    --shadow:0 1px 2px rgba(23,32,45,.05), 0 8px 28px rgba(23,32,45,.06);
  }
  :root[data-theme="dark"]{
    --bg:#12151a; --card:#1a1e25; --inset:#20252d;
    --ink:#e7eaee; --muted:#9aa3ae; --faint:#646d79;
    --border:#272c35; --border2:#333a45;
    --accent:#7e82f0; --on-accent:#0e1030; --accent-soft:rgba(126,130,240,.12);
    --ok:#43c383;
    --shadow:0 1px 2px rgba(0,0,0,.4), 0 8px 28px rgba(0,0,0,.3);
  }
  @media (prefers-color-scheme: dark){
    :root:not([data-theme="light"]):not([data-theme="dark"]){
      --bg:#12151a; --card:#1a1e25; --inset:#20252d;
      --ink:#e7eaee; --muted:#9aa3ae; --faint:#646d79;
      --border:#272c35; --border2:#333a45;
      --accent:#7e82f0; --on-accent:#0e1030; --accent-soft:rgba(126,130,240,.12);
      --ok:#43c383;
      --shadow:0 1px 2px rgba(0,0,0,.4), 0 8px 28px rgba(0,0,0,.3);
    }
  }
  *{box-sizing:border-box;margin:0}
  body{background:var(--bg);color:var(--ink);font:16.5px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;-webkit-font-smoothing:antialiased}
  .mono{font-family:ui-monospace,"SF Mono",SFMono-Regular,Menlo,Consolas,monospace}
  .wrap{max-width:1060px;margin:0 auto;padding:0 24px}
  a{color:inherit;text-decoration:none}
  p a{color:var(--accent)}
  p a:hover{text-decoration:underline}

  /* nav */
  .nav{position:sticky;top:0;z-index:20;background:color-mix(in srgb, var(--bg) 86%, transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--border)}
  .nav .wrap{display:flex;align-items:center;gap:12px;height:64px}
  .brand{display:flex;align-items:center;gap:9px;font-weight:620;font-size:16.5px;letter-spacing:-.01em;margin-right:16px}
  .brand .mark{width:23px;height:23px;border-radius:7px;background:var(--accent);display:grid;place-items:center}
  .brand .mark svg{width:13px;height:13px;stroke:var(--on-accent);stroke-width:2.4;fill:none;stroke-linecap:round}
  .nav-links{display:flex;gap:4px;font-size:15px;color:var(--muted)}
  .nav-links a{padding:6px 11px;border-radius:8px}
  .nav-links a:hover{color:var(--ink);background:var(--inset)}
  .nav .sp{flex:1}
  .gh{display:inline-flex;align-items:center;gap:6px;font-size:14.5px;color:var(--muted);padding:6px 10px;border-radius:8px}
  .gh:hover{color:var(--ink);background:var(--inset)}
  .gh svg{width:15px;height:15px;fill:currentColor}
  .btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border-radius:9px;padding:9px 18px;font-size:15px;font-weight:560;border:1px solid transparent;cursor:pointer;transition:filter .12s,border-color .12s;white-space:nowrap}
  .btn.primary{background:var(--accent);color:var(--on-accent)}
  .btn.primary:hover{filter:brightness(1.08)}
  .btn.outline{border-color:var(--border2);background:var(--card);color:var(--ink)}
  .btn.outline:hover{border-color:var(--faint)}
  .btn.lg{padding:13px 26px;font-size:16.5px;min-height:52px;border-radius:11px}

  /* hero */
  .hero .wrap{display:grid;grid-template-columns:minmax(0,1.04fr) minmax(0,.96fr);gap:64px;align-items:center;padding-top:44px;padding-bottom:80px}
  .pill{display:inline-flex;align-items:center;gap:7px;font-size:12.5px;font-weight:550;letter-spacing:.01em;color:var(--accent);background:var(--accent-soft);border-radius:999px;padding:4px 12px;margin-bottom:22px}
  .pill .dot{width:6px;height:6px;border-radius:50%;background:var(--accent)}
  h1{font-size:clamp(38px,5vw,56px);line-height:1.08;letter-spacing:-.028em;font-weight:640;text-wrap:balance}
  .sub{margin-top:22px;font-size:18px;line-height:1.7;color:var(--muted);max-width:44ch}
  .sub b{color:var(--ink);font-weight:550}
  .cta-row{margin-top:32px;display:flex;gap:12px;flex-wrap:wrap}
  .assure{margin-top:26px;font-size:14.5px;color:var(--faint)}
  .assure b{color:var(--muted);font-weight:550}
  .assure a{color:var(--accent)}
  .assure a:hover{text-decoration:underline}

  /* popup mock */
  .mock{background:var(--card);border:1px solid var(--border);border-radius:14px;box-shadow:var(--shadow);overflow:hidden}
  .mock-top{display:flex;align-items:center;gap:8px;padding:12px 15px;border-bottom:1px solid var(--border)}
  .mock-top .name{font-weight:620;font-size:15px;display:flex;align-items:center;gap:8px}
  .mock-top .name .mark{width:18px;height:18px;border-radius:5px;background:var(--accent)}
  .mock-top .sp{flex:1}
  .chip{font-size:13px;padding:5px 12px;border-radius:7px;border:1px solid var(--border);background:var(--inset);color:var(--muted)}
  .chip.accent{color:var(--accent);border-color:transparent;background:var(--accent-soft);font-weight:550}
  .mrow{display:grid;grid-template-columns:18px minmax(0,1fr) minmax(0,1.05fr) 16px;gap:10px;align-items:center;padding:11px 16px;border-bottom:1px solid var(--border);font-size:14px}
  .cbx{width:15px;height:15px;border-radius:4px;background:var(--accent);position:relative}
  .cbx::after{content:"";position:absolute;left:4.5px;top:1.5px;width:4px;height:8px;border:solid var(--on-accent);border-width:0 2px 2px 0;transform:rotate(43deg)}
  .fld{background:var(--card);border:1px solid var(--border2);border-radius:7px;padding:7px 11px;font-family:ui-monospace,"SF Mono",Menlo,monospace;font-size:13px;color:var(--ink);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
  .fld.v{color:var(--ink)}
  .xd{color:var(--faint);text-align:center}
  .madd{padding:11px 16px;font-size:14px;color:var(--accent);font-weight:550}
  .share-card{margin-top:14px;display:flex;align-items:center;gap:10px;background:var(--card);border:1px solid var(--border);border-radius:11px;padding:12px 15px;font-size:13px;box-shadow:var(--shadow)}
  .share-card .u{font-family:ui-monospace,"SF Mono",Menlo,monospace;color:var(--muted);flex:1;min-width:0;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
  .share-card .ok{color:var(--ok);font-weight:560;white-space:nowrap}

  /* trust band */
  .band{background:var(--card);border-top:1px solid var(--border);border-bottom:1px solid var(--border)}
  .band .wrap{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;padding:0}
  .band .cellb{padding:30px 24px;text-align:center;border-left:1px solid var(--border)}
  .band .cellb:first-child{border-left:none}
  .band .t{font-size:16.5px;font-weight:620;letter-spacing:-.01em}
  .band .d{font-size:14px;color:var(--muted);margin-top:5px}

  /* sections */
  section{padding:88px 0}
  .sec-head{text-align:center;margin-bottom:48px}
  .kicker{font-size:13px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--accent);margin-bottom:12px}
  h2{font-size:30px;letter-spacing:-.022em;font-weight:630}
  .sec-sub{margin:12px auto 0;color:var(--muted);font-size:16.5px;max-width:52ch}
  .cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}
  .card{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:28px;box-shadow:0 1px 2px rgba(23,32,45,.03)}
  .card .n{width:32px;height:32px;border-radius:9px;background:var(--accent-soft);color:var(--accent);display:grid;place-items:center;font-size:15px;font-weight:620;margin-bottom:16px}
  .card h3{font-size:17.5px;font-weight:620;letter-spacing:-.012em;margin-bottom:8px}
  .card p{font-size:15.5px;line-height:1.65;color:var(--muted)}
  .card code{font-family:ui-monospace,Menlo,monospace;font-size:12px;background:var(--inset);border:1px solid var(--border);border-radius:4px;padding:1px 5px}

  /* promise list */
  .promises{max-width:680px;margin:0 auto;background:var(--card);border:1px solid var(--border);border-radius:14px;overflow:hidden;box-shadow:var(--shadow)}
  .prow{display:flex;gap:14px;align-items:flex-start;padding:18px 22px;border-top:1px solid var(--border)}
  .prow:first-child{border-top:none}
  .prow .tick{flex:none;width:20px;height:20px;border-radius:50%;background:var(--accent-soft);display:grid;place-items:center;margin-top:1px}
  .prow .tick svg{width:11px;height:11px;stroke:var(--ok);stroke-width:2.6;fill:none;stroke-linecap:round;stroke-linejoin:round}
  .prow h3{font-size:14.5px;font-weight:620;letter-spacing:-.01em}
  .prow p{font-size:13.5px;color:var(--muted);margin-top:3px}
  .prow .aud{margin-left:auto;flex:none;font-size:12px;color:var(--accent);font-weight:550;white-space:nowrap;margin-top:2px}

  /* switch strip */
  .strip{display:flex;align-items:center;gap:24px;background:var(--card);border:1px solid var(--border);border-radius:14px;padding:32px 34px;box-shadow:var(--shadow)}
  .strip h2{font-size:21px}
  .strip p{color:var(--muted);font-size:15px;margin-top:5px}
  .strip .sp{flex:1}

  /* faq */
  .faq{max-width:680px;margin:0 auto}
  .faq details{background:var(--card);border:1px solid var(--border);border-radius:12px;margin-bottom:12px;padding:0 22px}
  .faq summary{cursor:pointer;font-weight:560;font-size:16.5px;padding:18px 0;list-style:none;display:flex;align-items:center;min-height:48px}
  .faq summary::after{content:"+";margin-left:auto;color:var(--faint);font-size:17px}
  .faq details[open] summary::after{content:"–"}
  .faq p{color:var(--muted);font-size:15px;line-height:1.65;padding:0 0 18px}
  .faq code{font-family:ui-monospace,Menlo,monospace;font-size:12px;background:var(--inset);border-radius:4px;padding:1px 5px}

  footer{border-top:1px solid var(--border);padding:52px 0 40px;font-size:14px;color:var(--faint)}
  .bigfoot{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:24px}
  .bigfoot h4{font-size:12.5px;font-weight:620;letter-spacing:.07em;text-transform:uppercase;color:var(--muted);margin:0 0 12px}
  .bigfoot ul{list-style:none;margin:0;padding:0}
  .bigfoot li{margin:9px 0}
  .bigfoot a{color:var(--faint);font-size:14px}
  .bigfoot a:hover{color:var(--ink)}
  .foot-meta{margin-top:32px;padding-top:18px;border-top:1px solid var(--border);text-align:center}


  @media (max-width:820px){
    .hero .wrap{grid-template-columns:minmax(0,1fr);gap:44px;padding-top:40px;padding-bottom:56px}
    .nav .wrap{gap:4px;padding-left:16px;padding-right:16px}
    .nav .btn{padding:7px 11px;font-size:13.5px}
    .nav .gh{padding:6px 6px;font-size:13px}
    .cards{grid-template-columns:1fr}
    .nav-links{display:none}
    .band .wrap{grid-template-columns:1fr 1fr}
    .band .cellb{border-left:none;border-top:1px solid var(--border);text-align:left}
    .band .cellb:nth-child(1),.band .cellb:nth-child(2){border-top:none}
    .band .cellb:nth-child(even){border-left:1px solid var(--border)}
    .strip{flex-direction:column;align-items:flex-start;gap:14px}
    .prow .aud{display:none}
    .cta-row .btn{flex:1;min-width:150px}
    section{padding:64px 0}
    .sec-head{text-align:left}
    .sec-sub{margin-left:0}
    .bigfoot{grid-template-columns:1fr 1fr;gap:20px 16px}
  }

  /* skip link (a11y) */
  .skip-link{position:absolute;left:-9999px;top:auto;width:1px;height:1px;overflow:hidden}
  .skip-link:focus{left:12px;top:12px;width:auto;height:auto;z-index:1000;background:var(--card);color:var(--ink);border:2px solid var(--accent);border-radius:8px;padding:.5rem .75rem}

  /* testimonials */
  .quotes{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;max-width:880px;margin:0 auto}
  .quote{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:28px 30px;box-shadow:0 1px 2px rgba(23,32,45,.03)}
  .quote p{font-size:15.5px;color:var(--ink);line-height:1.7;margin:0}
  .quote .who{margin-top:16px;font-size:14px;color:var(--faint)}
  .quote .who b{color:var(--muted);font-weight:560}
  .quotes-note{text-align:center;margin-top:26px;font-size:15px;color:var(--muted)}
  .quotes-note a{color:var(--accent)}
  .quotes-note a:hover{text-decoration:underline}
  @media (max-width:820px){.quotes{grid-template-columns:1fr}}

  /* fragment privacy animation (shared: / and /s) */
      /* fragment animation */
      .h2-code{font-family:ui-monospace,Menlo,monospace;font-size:.85em;background:var(--accent-soft);color:var(--accent);border-radius:7px;padding:1px 9px}
      .sec-sub code{font-family:ui-monospace,Menlo,monospace;font-size:14px;background:var(--inset);border:1px solid var(--border);border-radius:5px;padding:1px 6px}
      .frag-demo{margin:0 auto;max-width:880px;overflow-x:auto}
      .frag-demo svg{min-width:680px;display:block}
      .fd-label{font-size:11.5px;letter-spacing:.09em;fill:var(--faint);font-weight:600}
      .fd-mono{font-family:ui-monospace,"SF Mono",Menlo,monospace;font-size:13.5px}
      .fd-url{font-size:14.5px}
      .fd-ink{fill:var(--ink)}
      .fd-dim{fill:var(--muted)}
      .fd-faintline{fill:var(--faint);font-style:italic}
      .fd-accent{fill:var(--accent)}
      .fd-onaccent{fill:var(--on-accent);font-weight:600}
      .fd-check{font-size:14px;fill:var(--ok);font-weight:600}
      .fd-mono-sm{font-family:ui-monospace,"SF Mono",Menlo,monospace;font-size:12px}
      .fd-req{animation:fd-req 9s ease-in-out infinite}
      .fd-frag{animation:fd-frag 9s ease-in-out infinite}
      .fd-hop{animation:fd-hop 9s ease-in-out infinite}
      .fd-appear{opacity:0;animation:fd-fade 9s ease infinite}
      .fd-appear2{opacity:0;animation:fd-fade2 9s ease infinite}
      @keyframes fd-req{
        0%,5%{transform:translate(0,0);opacity:0}
        11%{opacity:1;transform:translate(0,0)}
        34%{transform:translate(444px,188px);opacity:1}
        41%,100%{transform:translate(444px,188px);opacity:0}
      }
      @keyframes fd-frag{
        0%,5%{transform:translate(0,0) scale(1);opacity:0}
        11%{opacity:1;transform:translate(0,0) scale(1)}
        34%{transform:translate(-150px,183px) scale(.79);opacity:1}
        41%,100%{transform:translate(-150px,183px) scale(.79);opacity:0}
      }
      @keyframes fd-fade{
        0%,36%{opacity:0}
        44%,94%{opacity:1}
        100%{opacity:0}
      }
      @keyframes fd-hop{
        0%,48%{transform:translate(0,0);opacity:0}
        54%{opacity:1;transform:translate(0,0)}
        70%{transform:translate(210px,0);opacity:1}
        77%,100%{transform:translate(210px,0);opacity:0}
      }
      @keyframes fd-fade2{
        0%,72%{opacity:0}
        80%,94%{opacity:1}
        100%{opacity:0}
      }
      @media (prefers-reduced-motion: reduce){
        .fd-req,.fd-frag,.fd-hop{animation:none;opacity:0}
        .fd-appear,.fd-appear2{animation:none;opacity:1}
      }
      .refs{margin:22px 0 0;font-size:13.5px;color:var(--faint);text-align:center}
      .refs a{color:var(--accent)}
      .refs a:hover{text-decoration:underline}

/* homepage step illustrations */
.step-art{margin:-28px -28px 16px;background:var(--inset);border-bottom:1px solid var(--border);border-radius:14px 14px 0 0;overflow:hidden}
.step-art svg{display:block}

/* how-it-works: vertical steps with large screenshots */
.vsteps{display:flex;flex-direction:column;gap:40px;max-width:920px;margin:0 auto}
.vstep-head{display:flex;gap:14px;align-items:flex-start;margin-bottom:14px;text-align:left}
.vstep-head .n{flex:none;width:32px;height:32px;border-radius:9px;background:var(--accent-soft);color:var(--accent);display:grid;place-items:center;font-size:15px;font-weight:620}
.vstep-head h3{font-size:17.5px;font-weight:620;letter-spacing:-.012em;margin:0 0 4px}
.vstep-head p{font-size:15.5px;color:var(--muted);margin:0}
.vshot{display:block;width:100%;height:auto;border:1px solid var(--border);border-radius:14px;box-shadow:0 8px 30px rgba(23,32,45,.08)}