:root{
    --bg:#05060c;
    --bg-2:#080a14;
    --panel:rgba(18,22,38,0.55);
    --panel-solid:#0d1120;
    --line:rgba(120,150,255,0.14);
    --line-strong:rgba(130,160,255,0.35);
    --txt:#e8ecff;
    --txt-dim:#98a2c8;
    --txt-faint:#5f6a92;
    --cyan:#3ad9ff;
    --blue:#4d7cff;
    --violet:#8a5cff;
    --magenta:#c265ff;
    --glow-blue:0 0 40px rgba(77,124,255,0.45);
    --radius:16px;
    --maxw:1180px;
    --mono:"SF Mono",ui-monospace,"JetBrains Mono","Fira Code",Menlo,monospace;
    --sans:-apple-system,BlinkMacSystemFont,"Segoe UI",Inter,Roboto,Helvetica,Arial,sans-serif;
  }
  *{box-sizing:border-box;margin:0;padding:0}
  html{scroll-behavior:smooth}
  body{
    background:var(--bg);
    color:var(--txt);
    font-family:var(--sans);
    line-height:1.6;
    -webkit-font-smoothing:antialiased;
    overflow-x:hidden;
  }
  a{color:inherit;text-decoration:none}
  ::selection{background:rgba(138,92,255,.45);color:#fff}

  /* ---------- ambient background ---------- */
  .bg-layer{position:fixed;inset:0;z-index:-2;pointer-events:none}
  .bg-grid{
    position:fixed;inset:0;z-index:-2;pointer-events:none;
    background-image:
      linear-gradient(rgba(90,120,255,.05) 1px,transparent 1px),
      linear-gradient(90deg,rgba(90,120,255,.05) 1px,transparent 1px);
    background-size:54px 54px;
    mask-image:radial-gradient(ellipse 90% 70% at 50% 0%,#000 30%,transparent 78%);
    -webkit-mask-image:radial-gradient(ellipse 90% 70% at 50% 0%,#000 30%,transparent 78%);
  }
  .bg-glow{
    position:fixed;z-index:-3;border-radius:50%;filter:blur(90px);opacity:.5;pointer-events:none;
  }
  .g1{top:-260px;left:50%;transform:translateX(-50%);width:900px;height:600px;
      background:radial-gradient(circle,rgba(77,124,255,.55),transparent 65%)}
  .g2{top:600px;left:-200px;width:600px;height:600px;
      background:radial-gradient(circle,rgba(138,92,255,.35),transparent 65%)}
  .g3{top:1600px;right:-250px;width:650px;height:650px;
      background:radial-gradient(circle,rgba(58,217,255,.22),transparent 65%)}

  /* ---------- layout helpers ---------- */
  .wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
  section{position:relative}
  .eyebrow{
    font-family:var(--mono);font-size:12px;letter-spacing:.32em;text-transform:uppercase;
    color:var(--cyan);display:inline-flex;align-items:center;gap:10px;margin-bottom:18px;
  }
  .eyebrow::before{content:"";width:26px;height:1px;background:linear-gradient(90deg,var(--cyan),transparent)}
  h2.sec{font-size:clamp(28px,4vw,44px);font-weight:700;letter-spacing:-.02em;line-height:1.1;margin-bottom:16px}
  .sec-sub{color:var(--txt-dim);max-width:640px;font-size:16.5px}
  .grad-text{
    background:linear-gradient(120deg,#fff 0%,var(--cyan) 45%,var(--violet) 100%);
    -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
  }

  /* ---------- nav ---------- */
  header{position:sticky;top:0;z-index:50;transition:.3s}
  header.scrolled{backdrop-filter:blur(16px);background:rgba(5,6,12,.72);border-bottom:1px solid var(--line)}
  .nav{display:flex;align-items:center;justify-content:space-between;height:70px}
  .brand{display:flex;align-items:center;gap:11px;font-weight:700;letter-spacing:-.01em}
  .brand .logo{
    width:30px;height:30px;border-radius:8px;position:relative;flex:0 0 auto;
    background:linear-gradient(135deg,var(--blue),var(--violet));
    box-shadow:var(--glow-blue);display:grid;place-items:center;
    font-family:var(--mono);font-weight:700;font-size:13px;color:#fff;
  }
  .brand small{display:block;font-size:10px;letter-spacing:.28em;color:var(--txt-faint);font-weight:500;font-family:var(--mono)}
  .nav-links{display:flex;gap:30px;align-items:center}
  .nav-links a{font-size:14px;color:var(--txt-dim);transition:.2s;position:relative}
  .nav-links a:hover{color:var(--txt)}
  .nav-links a::after{content:"";position:absolute;left:0;bottom:-6px;height:1px;width:0;background:var(--cyan);transition:.25s}
  .nav-links a:hover::after{width:100%}
  .btn{
    display:inline-flex;align-items:center;gap:9px;font-size:14px;font-weight:600;
    padding:11px 20px;border-radius:10px;cursor:pointer;transition:.25s;border:1px solid transparent;
  }
  .btn-primary{
    background:linear-gradient(120deg,var(--blue),var(--violet));color:#fff;
    box-shadow:0 6px 24px rgba(77,124,255,.4);
  }
  .btn-primary:hover{transform:translateY(-2px);box-shadow:0 10px 34px rgba(120,92,255,.55)}
  .btn-ghost{border:1px solid var(--line-strong);color:var(--txt);background:rgba(255,255,255,.02)}
  .btn-ghost:hover{border-color:var(--cyan);color:#fff;background:rgba(58,217,255,.06)}
  .nav-links .btn{padding:10px 18px}
  .menu-toggle{display:none;background:none;border:1px solid var(--line-strong);border-radius:8px;padding:8px 10px;color:var(--txt);cursor:pointer}

  /* ---------- hero ---------- */
  .hero{padding:74px 0 60px;text-align:center}
  .pill{
    display:inline-flex;align-items:center;gap:9px;font-family:var(--mono);font-size:12px;
    padding:7px 15px;border-radius:100px;border:1px solid var(--line-strong);
    background:rgba(58,217,255,.05);color:var(--txt-dim);margin-bottom:30px;
  }
  .pill .dot{width:7px;height:7px;border-radius:50%;background:var(--cyan);box-shadow:0 0 10px var(--cyan);animation:pulse 2s infinite}
  @keyframes pulse{0%,100%{opacity:1}50%{opacity:.35}}
  .hero h1{
    font-size:clamp(46px,9vw,104px);font-weight:800;letter-spacing:-.045em;line-height:.95;
    margin-bottom:8px;
    background:linear-gradient(180deg,#fff 30%,#9fb4ff 130%);
    -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
    filter:drop-shadow(0 0 40px rgba(77,124,255,.35));
  }
  .hero .tag{font-family:var(--mono);font-size:clamp(13px,2.4vw,17px);letter-spacing:.34em;text-transform:uppercase;color:var(--cyan);margin-bottom:26px}
  .hero p.lead{max-width:600px;margin:0 auto 34px;color:var(--txt-dim);font-size:clamp(16px,2vw,18.5px)}
  .hero .cta{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-bottom:16px}
  .hero .cta .btn{padding:14px 26px;font-size:15px}
  .os-note{font-family:var(--mono);font-size:12px;color:var(--txt-faint);letter-spacing:.05em}

  /* app window mock */
  .app-mock{
    max-width:960px;margin:56px auto 0;border-radius:18px;overflow:hidden;
    border:1px solid var(--line-strong);
    background:linear-gradient(180deg,rgba(20,25,44,.9),rgba(9,11,20,.9));
    box-shadow:0 40px 120px rgba(0,0,0,.6),0 0 80px rgba(77,124,255,.15);
    position:relative;
  }
  .app-bar{display:flex;align-items:center;gap:8px;padding:12px 16px;border-bottom:1px solid var(--line);background:rgba(0,0,0,.25)}
  .app-bar .dots{display:flex;gap:7px}
  .app-bar .dots i{width:11px;height:11px;border-radius:50%;display:inline-block}
  .app-bar .dots i:nth-child(1){background:#ff5f57}
  .app-bar .dots i:nth-child(2){background:#febc2e}
  .app-bar .dots i:nth-child(3){background:#28c840}
  .app-bar .title{font-family:var(--mono);font-size:12px;color:var(--txt-faint);margin-left:12px}
  .app-body{display:grid;grid-template-columns:190px 1fr;min-height:300px}
  .app-side{border-right:1px solid var(--line);padding:16px 14px;background:rgba(0,0,0,.18)}
  .app-side .sitem{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--txt-dim);padding:8px 10px;border-radius:8px;margin-bottom:3px}
  .app-side .sitem.active{background:rgba(77,124,255,.14);color:#fff;border:1px solid var(--line-strong)}
  .app-side .sitem .ic{width:15px;height:15px;opacity:.8}
  .app-main{padding:20px 22px;font-family:var(--mono);font-size:12.5px}
  .log-line{display:flex;gap:10px;margin-bottom:9px;opacity:0;animation:fadein .5s forwards}
  .log-line .t{color:var(--txt-faint);flex:0 0 auto}
  .log-line .ok{color:#28c840}
  .log-line .cy{color:var(--cyan)}
  .log-line .vi{color:var(--violet)}
  .log-line .dim{color:var(--txt-dim)}
  @keyframes fadein{to{opacity:1}}

  /* trust strip */
  .strip{border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin-top:70px;background:rgba(255,255,255,.012)}
  .strip .wrap{display:flex;flex-wrap:wrap;justify-content:space-between;gap:20px;padding-top:26px;padding-bottom:26px}
  .stat{text-align:center;flex:1 1 140px}
  .stat .n{font-size:clamp(28px,4vw,40px);font-weight:800;letter-spacing:-.02em;
    background:linear-gradient(120deg,var(--cyan),var(--violet));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
  .stat .l{font-family:var(--mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--txt-faint);margin-top:6px}

  /* ---------- section shell ---------- */
  .block{padding:100px 0}
  .sec-head{margin-bottom:52px}

  /* principles */
  .cards{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
  .card{
    border:1px solid var(--line);border-radius:var(--radius);padding:26px 22px;
    background:var(--panel);backdrop-filter:blur(8px);position:relative;overflow:hidden;
    transition:.3s;
  }
  .card::before{content:"";position:absolute;inset:0;border-radius:inherit;padding:1px;
    background:linear-gradient(140deg,var(--accent,var(--blue)),transparent 55%);
    -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
    -webkit-mask-composite:xor;mask-composite:exclude;opacity:0;transition:.3s}
  .card:hover{transform:translateY(-6px);border-color:transparent}
  .card:hover::before{opacity:1}
  .card .icn{
    width:46px;height:46px;border-radius:12px;display:grid;place-items:center;margin-bottom:18px;
    background:rgba(77,124,255,.1);border:1px solid var(--line-strong);color:var(--accent,var(--cyan));
  }
  .card h3{font-size:18px;margin-bottom:9px;letter-spacing:-.01em}
  .card p{font-size:14px;color:var(--txt-dim)}
  .card .num{position:absolute;top:20px;right:22px;font-family:var(--mono);font-size:12px;color:var(--txt-faint)}

  /* architecture */
  .arch{
    border:1px solid var(--line);border-radius:22px;padding:34px;background:var(--panel);backdrop-filter:blur(8px);
    position:relative;overflow:hidden;
  }
  .arch-grid{display:flex;flex-direction:column;gap:16px}
  .arch-row{display:grid;gap:14px}
  .r1{grid-template-columns:1fr}
  .r3{grid-template-columns:repeat(3,1fr)}
  .r-core{grid-template-columns:1fr}
  .r-opt{grid-template-columns:repeat(3,1fr)}
  .node{
    border:1px solid var(--line);border-radius:12px;padding:16px 18px;background:rgba(13,17,32,.7);
    transition:.25s;position:relative;
  }
  .node:hover{border-color:var(--line-strong);background:rgba(20,26,48,.8);transform:translateY(-3px)}
  .node .nh{display:flex;align-items:center;gap:10px;font-weight:600;font-size:14.5px;margin-bottom:8px}
  .node .nh .ic{width:16px;height:16px;flex:0 0 auto}
  .node ul{list-style:none;font-family:var(--mono);font-size:11.5px;color:var(--txt-faint);display:flex;flex-wrap:wrap;gap:6px 14px}
  .node ul li::before{content:"›";color:var(--cyan);margin-right:5px}
  .node.core{border-color:var(--line-strong);background:linear-gradient(120deg,rgba(77,124,255,.12),rgba(138,92,255,.08));box-shadow:0 0 40px rgba(77,124,255,.12)}
  .node.core .nh{color:var(--cyan)}
  .node.repair{border-color:rgba(194,101,255,.35);background:linear-gradient(120deg,rgba(194,101,255,.08),transparent)}
  .node.repair .nh{color:var(--magenta)}
  .arch-caption{font-family:var(--mono);font-size:12px;color:var(--txt-faint);text-align:center;margin-top:26px;letter-spacing:.03em}
  .arch-caption b{color:var(--cyan)}

  /* workflow */
  .flow{display:grid;grid-template-columns:repeat(6,1fr);gap:0;position:relative;margin-top:20px}
  .step{text-align:center;padding:0 12px;position:relative}
  .step .circle{
    width:56px;height:56px;border-radius:50%;margin:0 auto 16px;display:grid;place-items:center;
    font-family:var(--mono);font-weight:700;font-size:18px;color:#fff;position:relative;z-index:2;
    background:linear-gradient(135deg,rgba(20,26,48,.95),rgba(13,17,32,.95));
    border:1px solid var(--line-strong);transition:.3s;
  }
  .step:hover .circle{border-color:var(--cyan);box-shadow:0 0 26px rgba(58,217,255,.5);color:var(--cyan)}
  .step::after{content:"";position:absolute;top:28px;left:60%;width:80%;height:1px;
    background:linear-gradient(90deg,var(--line-strong),var(--line));z-index:1}
  .step:last-child::after{display:none}
  .step.repair .circle{border-color:rgba(194,101,255,.5);color:var(--magenta)}
  .step h4{font-size:14.5px;margin-bottom:5px}
  .step p{font-size:12px;color:var(--txt-faint);font-family:var(--mono)}

  /* verification / quine */
  .quine{display:grid;grid-template-columns:1.1fr .9fr;gap:34px;align-items:center}
  .quine-steps{display:flex;flex-direction:column;gap:12px}
  .qstep{display:flex;align-items:center;gap:16px;border:1px solid var(--line);border-radius:12px;padding:15px 18px;background:var(--panel);transition:.25s}
  .qstep:hover{border-color:var(--line-strong);transform:translateX(6px)}
  .qstep .qn{font-family:var(--mono);font-size:13px;color:var(--cyan);width:26px;flex:0 0 auto}
  .qstep .qt strong{display:block;font-size:14.5px}
  .qstep .qt span{font-size:12.5px;color:var(--txt-faint);font-family:var(--mono)}
  .capsule{
    border:1px solid var(--line-strong);border-radius:18px;padding:26px;background:var(--panel-solid);
    font-family:var(--mono);font-size:12.5px;position:relative;overflow:hidden;
    box-shadow:0 0 50px rgba(138,92,255,.14);
  }
  .capsule .ch{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}
  .capsule .ch b{color:var(--txt);font-size:13px}
  .capsule .badge{font-size:10px;padding:4px 9px;border-radius:100px;border:1px solid rgba(40,200,64,.4);color:#28c840;background:rgba(40,200,64,.08)}
  .capsule .kv{display:flex;justify-content:space-between;padding:7px 0;border-bottom:1px dashed var(--line);color:var(--txt-faint)}
  .capsule .kv span:last-child{color:var(--txt-dim)}
  .capsule .hash{color:var(--cyan);word-break:break-all}
  .capsule .match{margin-top:16px;display:flex;align-items:center;gap:10px;color:#28c840;font-weight:600;font-size:13px}

  /* privacy callout */
  .privacy{border:1px solid var(--line);border-radius:22px;padding:40px;background:
    linear-gradient(120deg,rgba(77,124,255,.08),rgba(138,92,255,.05));text-align:center;position:relative;overflow:hidden}
  .privacy .lock{font-size:34px;margin-bottom:14px}
  .privacy code{font-family:var(--mono);color:var(--cyan);background:rgba(58,217,255,.08);padding:3px 10px;border-radius:6px;border:1px solid var(--line)}

  /* download cta */
  .download{border-radius:26px;padding:64px 34px;text-align:center;position:relative;overflow:hidden;
    border:1px solid var(--line-strong);
    background:radial-gradient(ellipse 80% 120% at 50% 0%,rgba(77,124,255,.22),transparent 60%),var(--panel-solid)}
  .download h2{font-size:clamp(30px,5vw,52px);font-weight:800;letter-spacing:-.03em;margin-bottom:14px}
  .download p{color:var(--txt-dim);max-width:520px;margin:0 auto 30px}
  .os-row{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-bottom:18px}
  .os-btn{display:flex;align-items:center;gap:11px;border:1px solid var(--line-strong);border-radius:12px;
    padding:14px 24px;background:rgba(255,255,255,.02);transition:.25s;font-weight:600;font-size:15px}
  .os-btn:hover{border-color:var(--cyan);background:rgba(58,217,255,.06);transform:translateY(-3px)}
  .os-btn small{display:block;font-size:11px;color:var(--txt-faint);font-weight:400;font-family:var(--mono)}

  /* footer */
  footer{border-top:1px solid var(--line);padding:56px 0 40px;margin-top:40px}
  .foot{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:30px}
  .foot h5{font-family:var(--mono);font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--txt-faint);margin-bottom:16px}
  .foot a{display:block;font-size:14px;color:var(--txt-dim);margin-bottom:10px;transition:.2s}
  .foot a:hover{color:var(--cyan)}
  .foot .brand{margin-bottom:14px}
  .foot .desc{font-size:13.5px;color:var(--txt-faint);max-width:280px}
  .foot-bottom{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:14px;
    margin-top:44px;padding-top:24px;border-top:1px solid var(--line);
    font-family:var(--mono);font-size:12px;color:var(--txt-faint)}

  /* reveal animation */
  .reveal{opacity:0;transform:translateY(28px);transition:.7s cubic-bezier(.2,.7,.2,1)}
  .reveal.in{opacity:1;transform:none}

  /* ---------- responsive ---------- */
  @media(max-width:900px){
    .nav-links{display:none}
    .menu-toggle{display:inline-flex}
    .cards{grid-template-columns:repeat(2,1fr)}
    .arch-row.r3,.arch-row.r-opt{grid-template-columns:1fr}
    .flow{grid-template-columns:repeat(2,1fr);gap:34px 0}
    .step::after{display:none}
    .quine{grid-template-columns:1fr}
    .app-body{grid-template-columns:1fr}
    .app-side{display:none}
    .foot{grid-template-columns:1fr 1fr}
  }
  @media(max-width:520px){
    .cards{grid-template-columns:1fr}
    .strip .wrap{gap:26px}
    .stat{flex:1 1 40%}
    .foot{grid-template-columns:1fr}
    .block{padding:70px 0}
  }

  /* ---------- quine self-reproduction ---------- */
  .genchain{display:flex;align-items:center;justify-content:center;gap:14px;flex-wrap:wrap;margin:10px 0 12px}
  .gen{
    font-family:var(--mono);font-size:15px;font-weight:700;color:var(--cyan);
    border:1px solid var(--line-strong);border-radius:12px;padding:14px 26px;
    background:rgba(13,17,32,.8);transition:.25s;
  }
  .gen:hover{box-shadow:0 0 26px rgba(58,217,255,.35);transform:translateY(-3px)}
  .garrow{color:var(--txt-faint);font-size:18px}
  .geq{width:100%;text-align:center;font-family:var(--mono);font-size:13.5px;color:var(--txt);margin-top:14px}
  .geq b{color:var(--cyan)}
  .gsub{width:100%;text-align:center;font-family:var(--mono);font-size:11.5px;color:var(--txt-faint);letter-spacing:.04em}
  .quine2{display:grid;grid-template-columns:.95fr 1.05fr;gap:34px;align-items:stretch;margin-top:44px}
  .qterm{
    border:1px solid var(--line-strong);border-radius:18px;padding:24px;background:var(--panel-solid);
    font-family:var(--mono);font-size:12.5px;line-height:2.05;box-shadow:0 0 50px rgba(77,124,255,.12);
    overflow-x:auto;
  }
  .qterm .qth{display:flex;align-items:center;gap:8px;margin-bottom:14px}
  .qterm .qth i{width:10px;height:10px;border-radius:50%;display:inline-block}
  .qterm .qth i:nth-child(1){background:#ff5f57}.qterm .qth i:nth-child(2){background:#febc2e}.qterm .qth i:nth-child(3){background:#28c840}
  .qterm .qth span{font-size:11px;color:var(--txt-faint);margin-left:8px}
  .qterm .pr{color:var(--txt-faint)}
  .qterm .cmd{color:var(--txt)}
  .qterm .flag{color:var(--violet)}
  .qterm .okl{color:#28c840;font-weight:600}
  .qterm .cyl{color:var(--cyan)}
  .qcards{display:flex;flex-direction:column;gap:14px}
  .qcards .card{padding:20px 22px}
  .qcards .card h3{font-size:16px}
  .qcards .card p{font-size:13.5px}
  .quine-note{
    margin-top:26px;text-align:center;font-family:var(--mono);font-size:12px;color:var(--txt-faint);
    letter-spacing:.03em;line-height:1.9;
  }
  .quine-note b{color:var(--cyan);font-weight:600}
  .quine-strip{display:flex;justify-content:center;gap:26px;flex-wrap:wrap;margin-top:18px;
    font-family:var(--mono);font-size:11.5px;color:var(--txt-faint);letter-spacing:.06em}
  .quine-strip span b{color:var(--txt-dim);font-weight:600}
  @media(max-width:900px){
    .quine2{grid-template-columns:1fr}
  }
  .qterm{align-self:start}

  .foot-simple{grid-template-columns:1.8fr 1fr 1.4fr}
  @media(max-width:900px){.foot-simple{grid-template-columns:1fr}}

  /* hoisted inline styles */
  .u1{--accent:var(--blue)}
  .u2{--accent:var(--cyan)}
  .u3{--accent:var(--magenta)}
  .u4{--accent:var(--violet)}
  .u5{animation-delay:.1s}
  .u6{animation-delay:.5s}
  .u7{animation-delay:.9s}
  .u8{animation-delay:1.3s}
  .u9{animation-delay:1.7s}
  .u10{animation-delay:2.1s}
  .u11{color:var(--cyan)}
  .u12{color:var(--txt-faint);font-style:normal}
  .u13{justify-content:center}
  .u14{margin-bottom:12px}
  .u15{margin:0 auto 8px}
  .u16{padding-top:0}
  .u17{padding:16px 34px;font-size:16px}