:root{
    --bg:#FFFFFF;
    --surface:#FAFAFA;
    --surface-2:#F4F4F5;
    --border:#EAEAEA;
    --border-2:#E4E4E7;
    --ink:#0A0A0A;
    --ink-2:#171717;
    --muted:#6B7280;
    --muted-2:#9CA3AF;
    --accent:#2563EB;
    --accent-soft:#EFF4FF;
    --radius:12px;
    --container:1100px;
    --font:'Inter',system-ui,sans-serif;
    --mono:'JetBrains Mono',ui-monospace,monospace;
  }
  *{box-sizing:border-box;margin:0;padding:0}
  html{scroll-behavior:smooth}
  body{font-family:var(--font);background:var(--bg);color:var(--ink);line-height:1.6;
    -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:hidden}
  a{color:inherit;text-decoration:none}
  .wrap{max-width:var(--container);margin:0 auto;padding:0 24px}

  h1,h2,h3{font-weight:700;letter-spacing:-0.03em;line-height:1.08}
  .eyebrow{font-family:var(--mono);font-size:.74rem;font-weight:500;text-transform:uppercase;
    letter-spacing:.1em;color:var(--muted)}
  .lead{font-size:clamp(1.05rem,1.6vw,1.2rem);color:var(--muted);max-width:60ch;letter-spacing:-0.01em}

  .badge{display:inline-flex;align-items:center;gap:8px;font-family:var(--mono);font-size:.72rem;
    color:var(--muted);background:var(--surface);border:1px solid var(--border);padding:6px 12px;border-radius:999px}
  .badge::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--accent)}

  .logo{display:inline-flex;align-items:center;gap:9px;font-weight:800;font-size:1.3rem;
    letter-spacing:-0.04em;color:var(--ink);line-height:1}
  .logo svg{display:block;height:30px;width:auto}

  .btn{display:inline-flex;align-items:center;justify-content:center;gap:.5em;font-family:var(--font);
    font-weight:600;font-size:.96rem;padding:11px 20px;border-radius:10px;border:1px solid transparent;
    cursor:pointer;transition:transform .15s ease,background .15s ease,border-color .15s ease,box-shadow .15s ease;white-space:nowrap}
  .btn--primary{background:var(--ink);color:#fff}
  .btn--primary:hover{background:#2b2b2b;transform:translateY(-1px)}
  .btn--ghost{background:var(--bg);color:var(--ink);border-color:var(--border-2)}
  .btn--ghost:hover{border-color:var(--ink);transform:translateY(-1px)}
  .btn--white{background:#fff;color:var(--ink)}
  .btn--white:hover{transform:translateY(-1px);box-shadow:0 8px 20px -8px rgba(0,0,0,.5)}
  .btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
  .btn--lg{padding:13px 24px;font-size:1rem}

  header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.8);backdrop-filter:blur(12px);
    border-bottom:1px solid var(--border)}
  .nav{display:flex;align-items:center;justify-content:space-between;height:64px}
  .nav-right{display:flex;align-items:center;gap:10px}
  .nav .btn{padding:8px 16px;font-size:.9rem}

  .section{padding:clamp(4rem,8vw,6.5rem) 0;border-top:1px solid var(--border)}
  .section--plain{border-top:none}
  .section-head{max-width:680px;margin-bottom:clamp(2.2rem,4vw,3rem)}
  .section-head .eyebrow{display:block;margin-bottom:.9rem}
  .section-head h2{font-size:clamp(1.8rem,3.6vw,2.6rem)}
  .section-head p{margin-top:1rem}

  /* hero */
  .hero{padding:clamp(3.5rem,7vw,6rem) 0 clamp(3.5rem,7vw,5rem);position:relative;border-top:none}
  .hero::before{content:"";position:absolute;inset:0 0 auto 0;height:520px;z-index:-1;pointer-events:none;
    background:radial-gradient(60% 100% at 50% 0%,rgba(37,99,235,.07),transparent 70%)}
  .hero-inner{max-width:820px}
  .hero h1{font-size:clamp(2.6rem,6.2vw,4.6rem);font-weight:800;letter-spacing:-0.045em;
    margin:1.3rem 0 1.4rem;line-height:1.0}
  .hero .lead{font-size:clamp(1.1rem,1.8vw,1.35rem);max-width:54ch}
  .hero-cta{display:flex;flex-wrap:wrap;gap:12px;margin:2rem 0 1.1rem}
  .microtrust{font-family:var(--mono);font-size:.78rem;color:var(--muted)}
  .microtrust b{color:var(--ink);font-weight:500}

  .reveal{opacity:0;transform:translateY(16px);animation:rise .7s cubic-bezier(.2,.7,.2,1) forwards}
  .reveal.d1{animation-delay:.05s}.reveal.d2{animation-delay:.12s}.reveal.d3{animation-delay:.19s}.reveal.d4{animation-delay:.26s}
  @keyframes rise{to{opacity:1;transform:none}}

  /* hero chart */
  .chart-wrap{margin-top:clamp(2.5rem,5vw,3.5rem)}
  .panel-card{background:var(--bg);border:1px solid var(--border);border-radius:16px;padding:20px 22px 22px;
    box-shadow:0 1px 2px rgba(0,0,0,.04)}
  .pc-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:6px}
  .pc-title{font-weight:600;font-size:1rem;letter-spacing:-0.01em}
  .pc-chip{font-family:var(--mono);font-size:.68rem;color:var(--muted);background:var(--surface-2);
    padding:5px 9px;border-radius:6px}
  .panel-card svg{width:100%;height:auto;display:block}
  .trace{stroke-dasharray:900;stroke-dashoffset:900;animation:draw 1.6s ease .35s forwards}
  @keyframes draw{to{stroke-dashoffset:0}}
  .legend{display:flex;gap:18px;flex-wrap:wrap;margin-top:14px;font-family:var(--mono);font-size:.72rem;color:var(--muted)}
  .legend span{display:inline-flex;align-items:center;gap:7px}
  .tick{width:9px;height:9px;border-radius:2px;display:inline-block}

  /* problem */
  .contrast{display:grid;grid-template-columns:1fr 1fr;gap:16px}
  .panel{padding:28px;border-radius:var(--radius);border:1px solid var(--border)}
  .panel--lag{background:var(--surface)}
  .panel--lead{background:var(--bg);border-color:var(--ink)}
  .panel .tag{font-family:var(--mono);font-size:.72rem;font-weight:500;text-transform:uppercase;letter-spacing:.1em}
  .panel--lag .tag{color:var(--muted-2)}
  .panel--lead .tag{color:var(--accent)}
  .panel h3{font-size:1.3rem;margin:.5rem 0 1rem}
  .panel ul{list-style:none;display:grid;gap:.7rem}
  .panel li{position:relative;padding-left:1.5rem;color:var(--muted);font-size:.96rem}
  .panel li::before{content:"";position:absolute;left:0;top:.6em;width:8px;height:8px;border-radius:50%;background:var(--muted-2)}
  .panel--lead li{color:var(--ink-2)}
  .panel--lead li::before{background:var(--accent)}

  /* steps + pillars use a unified bordered grid */
  .grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
  .grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
  .tile{padding:26px;border-radius:var(--radius);background:var(--bg);border:1px solid var(--border);
    transition:border-color .18s ease,box-shadow .18s ease}
  .tile:hover{border-color:var(--border-2);box-shadow:0 8px 24px -16px rgba(0,0,0,.25)}
  .tile .num{font-family:var(--mono);font-weight:500;font-size:.82rem;color:var(--ink);
    border:1px solid var(--border);width:40px;height:40px;border-radius:10px;display:flex;align-items:center;
    justify-content:center;margin-bottom:16px}
  .tile .glyph{font-family:var(--mono);font-weight:500;font-size:.66rem;letter-spacing:.08em;color:var(--accent);
    display:flex;align-items:center;gap:7px;margin-bottom:14px}
  .tile h3{font-size:1.12rem;margin-bottom:.4rem;letter-spacing:-0.02em}
  .tile p{color:var(--muted);font-size:.92rem;line-height:1.6}

  /* differentiator (dark) */
  .dark{background:var(--ink);color:#fff;border-radius:20px;margin:0 8px;
    padding:clamp(3rem,6vw,4.8rem) clamp(1.6rem,5vw,3.6rem);position:relative;overflow:hidden}
  .dark::after{content:"";position:absolute;right:-160px;top:-160px;width:480px;height:480px;
    background:radial-gradient(circle,rgba(37,99,235,.35),transparent 60%);pointer-events:none}
  .dark .eyebrow{color:#8aa0d6}
  .dark h2{color:#fff;font-size:clamp(1.7rem,3.4vw,2.5rem);max-width:18ch;margin-top:.7rem}
  .diff-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:clamp(2.2rem,5vw,3rem);position:relative;z-index:1}
  .diff h3{font-size:1.15rem;color:#fff;margin:16px 0 .5rem;letter-spacing:-0.02em}
  .diff p{color:#a1a1aa;font-size:.93rem}
  .diff .ic{width:44px;height:44px;border-radius:11px;background:rgba(255,255,255,.06);
    border:1px solid rgba(255,255,255,.12);display:flex;align-items:center;justify-content:center}

  /* who */
  .who-card .role{font-family:var(--mono);font-size:.7rem;font-weight:500;letter-spacing:.08em;text-transform:uppercase;
    color:var(--accent);margin-bottom:.6rem}
  .who-card h3{font-size:1.1rem;margin-bottom:.5rem;letter-spacing:-0.02em}
  .who-card p{color:var(--muted);font-size:.92rem}

  /* faq */
  .faq{max-width:760px;margin:0 auto;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden}
  .faq details{border-bottom:1px solid var(--border)}
  .faq details:last-child{border-bottom:none}
  .faq summary{list-style:none;cursor:pointer;padding:20px 52px 20px 24px;position:relative;
    font-weight:600;font-size:1.02rem;letter-spacing:-0.01em}
  .faq summary::-webkit-details-marker{display:none}
  .faq summary::after{content:"+";position:absolute;right:22px;top:50%;transform:translateY(-50%);
    font-family:var(--mono);font-size:1.2rem;color:var(--muted)}
  .faq details[open] summary::after{content:"–";color:var(--ink)}
  .faq p{color:var(--muted);padding:0 24px 22px;font-size:.95rem}

  /* trust */
  .trust{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
  .trust span{font-family:var(--mono);font-size:.78rem;color:var(--muted);border:1px solid var(--border);
    background:var(--surface);padding:9px 16px;border-radius:999px;display:inline-flex;align-items:center;gap:8px}
  .trust span::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--accent)}

  /* final cta */
  .cta-final{background:var(--ink);color:#fff;border-radius:20px;text-align:center;
    padding:clamp(3rem,6vw,4.8rem) 24px;position:relative;overflow:hidden;margin:0 8px}
  .cta-final::before{content:"";position:absolute;left:50%;top:-160px;transform:translateX(-50%);width:520px;height:420px;
    background:radial-gradient(circle,rgba(37,99,235,.3),transparent 62%);pointer-events:none}
  .cta-final h2{color:#fff;font-size:clamp(1.8rem,3.8vw,2.7rem);max-width:18ch;margin:0 auto 1.5rem;position:relative}
  .cta-final .sub{font-family:var(--mono);font-size:.8rem;color:#a1a1aa;margin-top:1.1rem;position:relative}

  /* footer */
  footer{border-top:1px solid var(--border);padding:clamp(2.8rem,5vw,4rem) 0 2.4rem;margin-top:clamp(3.5rem,7vw,5rem)}
  .foot-grid{display:flex;justify-content:space-between;align-items:flex-start;gap:30px;flex-wrap:wrap}
  .foot-links{display:flex;gap:24px;flex-wrap:wrap;font-size:.9rem;color:var(--muted)}
  .foot-links a:hover{color:var(--ink)}
  .foot-bottom{margin-top:2.2rem;padding-top:1.5rem;border-top:1px solid var(--border);font-family:var(--mono);
    font-size:.74rem;color:var(--muted-2);display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}

  .sr{opacity:0;transform:translateY(22px);transition:opacity .6s ease,transform .6s cubic-bezier(.2,.7,.2,1)}
  .sr.in{opacity:1;transform:none}

  @media(max-width:880px){
    .contrast,.grid-3,.grid-4,.diff-grid{grid-template-columns:1fr}
    .grid-4{grid-template-columns:1fr 1fr}
  }
  @media(max-width:560px){
    .grid-4{grid-template-columns:1fr}
    .nav-right .btn--ghost{display:none}
    .dark,.cta-final{margin:0 4px;border-radius:16px}
  }
  @media(prefers-reduced-motion:reduce){
    *{animation:none!important;transition:none!important}
    .reveal,.sr{opacity:1;transform:none}
    .trace{stroke-dashoffset:0}
    html{scroll-behavior:auto}
  }
  .no-js .sr{opacity:1;transform:none}

  /* ---- minimal graphic elements ---- */
  .eyebrow::before{content:"";width:14px;height:1px;background:var(--accent);display:inline-block;vertical-align:middle;margin-right:10px}
  .hero{overflow:hidden}
  .hero-deco{position:absolute;inset:0;z-index:-1;pointer-events:none;
    background-image:radial-gradient(circle,rgba(10,10,10,.05) 1px,transparent 1.6px);background-size:30px 30px;
    -webkit-mask-image:radial-gradient(72% 56% at 50% -4%,#000,transparent 72%);
    mask-image:radial-gradient(72% 56% at 50% -4%,#000,transparent 72%)}
  .cplus{position:absolute;font-family:var(--mono);font-size:16px;line-height:1;color:rgba(255,255,255,.22);z-index:1;pointer-events:none}
  .cplus.tl{top:14px;left:16px}.cplus.br{bottom:12px;right:18px}

/* ===================================================== */
/* Vercel-style graphic layers (original, themed: signal) */
/* ===================================================== */

/* hero ambient glow */
.hero-glow{position:absolute;inset:0;z-index:-1;pointer-events:none;
  background:
    radial-gradient(42% 52% at 50% -8%,rgba(37,99,235,.10),transparent 70%),
    radial-gradient(30% 42% at 88% 2%,rgba(37,99,235,.06),transparent 70%);}

/* concentric "signal radar" line-art, faded */
.hero-rings{position:absolute;top:-150px;right:-110px;width:540px;height:540px;z-index:-1;
  pointer-events:none;opacity:.6;
  -webkit-mask-image:radial-gradient(closest-side,#000 35%,transparent 78%);
  mask-image:radial-gradient(closest-side,#000 35%,transparent 78%);}
.hero-rings circle.r{fill:none;stroke:rgba(10,10,10,.08)}

/* thin gradient edge-highlight on cards (Vercel signature) */
.panel-card{position:relative}
.panel-card::before{content:"";position:absolute;top:0;left:24px;right:24px;height:1px;
  background:linear-gradient(90deg,transparent,rgba(37,99,235,.45),transparent)}
.tile{position:relative;overflow:hidden}
.tile::before{content:"";position:absolute;top:0;left:20px;right:20px;height:1px;
  background:linear-gradient(90deg,transparent,rgba(37,99,235,.55),transparent);
  opacity:0;transition:opacity .25s ease}
.tile:hover::before{opacity:1}
.tile:hover{border-color:rgba(37,99,235,.35);box-shadow:0 12px 32px -20px rgba(37,99,235,.3)}

/* faint grid + edge sheen on dark sections */
.dark::before,.cta-final::after{content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(255,255,255,.045) 1px,transparent 1px),
    linear-gradient(90deg,rgba(255,255,255,.045) 1px,transparent 1px);
  background-size:42px 42px;
  -webkit-mask-image:radial-gradient(90% 80% at 50% 0%,#000,transparent 75%);
  mask-image:radial-gradient(90% 80% at 50% 0%,#000,transparent 75%)}
.dark,.cta-final{position:relative}

@media(prefers-reduced-motion:reduce){
  .tile::before{transition:none}
}

/* ===================== legal pages ===================== */
.legal{max-width:768px;margin:0 auto;padding:clamp(2.8rem,6vw,4.5rem) 0}
.legal h1{font-size:clamp(2rem,4vw,2.7rem);letter-spacing:-0.03em;margin-bottom:.4rem}
.legal .updated{font-family:var(--mono);font-size:.76rem;color:var(--muted-2);margin-bottom:2rem}
.legal h2{font-size:1.2rem;margin:2.1rem 0 .6rem;letter-spacing:-0.02em}
.legal p,.legal li{color:var(--muted);font-size:.97rem;line-height:1.72}
.legal p{margin-bottom:1rem}
.legal ul{margin:0 0 1.1rem 1.15rem;display:grid;gap:.4rem}
.legal a{color:var(--accent);text-decoration:underline}
.legal .toc{border:1px solid var(--border);border-radius:12px;padding:16px 20px;margin:1.5rem 0 2.2rem;background:var(--surface)}
.legal .toc strong{display:block;font-family:var(--mono);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted-2);margin-bottom:.5rem}
.legal .toc a{display:inline-block;color:var(--ink);text-decoration:none;font-size:.9rem;margin-right:18px;padding:2px 0}
.legal .toc a:hover{color:var(--accent)}
.legal .note{font-size:.86rem;color:var(--muted-2);border-top:1px solid var(--border);margin-top:2.4rem;padding-top:1.2rem}

/* ===================== cookie banner ===================== */
.cookie{position:fixed;left:16px;right:16px;bottom:16px;z-index:200;max-width:540px;margin:0 auto;
  background:var(--bg);border:1px solid var(--border-2);border-radius:14px;padding:18px 20px;
  box-shadow:0 24px 60px -22px rgba(0,0,0,.3);display:none}
.cookie.show{display:block}
.cookie p{font-size:.88rem;color:var(--muted);margin:0 0 14px;line-height:1.6}
.cookie a{color:var(--accent);text-decoration:underline}
.cookie-row{display:flex;gap:10px;flex-wrap:wrap}
.cookie .btn{padding:9px 16px;font-size:.86rem}

/* fix: CTA button always clickable above decorative layers */
.cta-final .btn{position:relative;z-index:2}