:root{
    --bg:#ffffff; --panel:#f6f8f5; --panel2:#eef2ec; --ink:#16211c; --soft:#57615a;
    --line:#e4e8e3; --line2:#cdd5cd; --accent:#1a5c3a; --accent2:#2f8a57;
    --dark:#12211a; --on-dark:#e9efe9; --on-dark-soft:#9db0a5; --dark-line:#28382f;
    --amber:#b45309; --amber-bg:#fbf3e6;
    --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
    --sans:Inter,system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
    --maxw:1080px; --pad:clamp(20px,5vw,40px);
  }
  *{box-sizing:border-box}
  html{scroll-behavior:smooth;scroll-padding-top:76px}
  body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased}
  h1,h2,h3{margin:0;letter-spacing:-.02em;line-height:1.12;text-wrap:balance}
  p{margin:0}
  a{color:inherit;text-decoration:none}
  .wrap{max-width:var(--maxw);margin:0 auto;padding-inline:var(--pad)}
  .mono{font-family:var(--mono)}
  :focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:2px}

  /* header */
  header{position:sticky;top:0;z-index:40;background:color-mix(in srgb,var(--bg) 92%,transparent);backdrop-filter:blur(9px);border-bottom:1px solid var(--line)}
  .nav{display:flex;align-items:center;justify-content:space-between;height:64px;gap:20px}
  .brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.06rem}
  .brand .m{width:30px;height:30px;border-radius:7px;background:var(--accent);color:#fff;display:grid;place-items:center;font-weight:800}
  .brand small{font-family:var(--mono);font-size:.58rem;letter-spacing:.16em;text-transform:uppercase;color:var(--soft);border-left:1px solid var(--line2);padding-left:9px}
  .nlinks{display:flex;gap:22px;font-size:.9rem}
  .nlinks a{color:var(--soft)} .nlinks a:hover{color:var(--ink)}
  .nav-r{display:flex;align-items:center;gap:16px}
  .lang{font-family:var(--mono);font-size:.72rem;color:var(--soft);border:1px solid var(--line2);border-radius:999px;padding:5px 11px}
  .lang b{color:var(--ink)}
  @media(max-width:860px){.nlinks,.brand small{display:none}}
  .btn{display:inline-flex;align-items:center;gap:8px;background:var(--accent);color:#fff;font-weight:600;font-size:.92rem;padding:10px 17px;border-radius:9px;border:1px solid var(--accent);cursor:pointer;transition:background .15s}
  .btn:hover{background:#144a2e}
  .btn.ghost{background:transparent;color:var(--ink);border-color:var(--line2)}
  .btn.ghost:hover{background:var(--panel)}
  .btn.lg{padding:14px 22px;font-size:1rem}
  .btn.onaccent{background:#fff;color:var(--accent);border-color:#fff}

  section{padding-block:clamp(48px,7vw,88px)}
  .kick{display:inline-flex;align-items:center;gap:10px;font-family:var(--mono);font-size:.7rem;letter-spacing:.16em;text-transform:uppercase;color:var(--accent);margin-bottom:16px}
  .kick::before{content:"";width:22px;height:1px;background:var(--accent)}
  h2.sec{font-size:clamp(1.5rem,3vw,2.05rem)}
  .lede{color:var(--soft);font-size:1.06rem;max-width:56ch;margin-top:14px}

  /* hero */
  .hero{padding-top:clamp(40px,6vw,70px);border-bottom:1px solid var(--line)}
  .hero .grid{display:grid;grid-template-columns:1fr;gap:clamp(32px,5vw,54px);align-items:center}
  @media(min-width:900px){.hero .grid{grid-template-columns:1.15fr .85fr}}
  .hero h1{font-size:clamp(2.1rem,5.2vw,3.3rem);max-width:15ch}
  .hero h1 em{font-style:normal;color:var(--accent)}
  .hero .sub{margin-top:22px;font-size:clamp(1.05rem,1.7vw,1.2rem);color:var(--soft);max-width:46ch}
  .hero .cta{margin-top:30px;display:flex;flex-wrap:wrap;gap:14px}
  .hero .strip{margin-top:34px;padding-top:20px;border-top:1px solid var(--line);display:flex;flex-wrap:wrap;gap:10px 26px}
  .hero .strip span{font-family:var(--mono);font-size:.76rem;color:var(--ink);display:inline-flex;gap:8px;align-items:baseline}
  .hero .strip span::before{content:"";width:6px;height:6px;background:var(--accent);border-radius:2px;transform:rotate(45deg);position:relative;top:1px}
  /* spec card */
  .card-doc{border:1px solid var(--line2);border-radius:12px;overflow:hidden;background:var(--panel)}
  .card-doc .h{background:var(--dark);color:var(--on-dark);padding:12px 16px;font-family:var(--mono);font-size:.66rem;letter-spacing:.12em;text-transform:uppercase;display:flex;justify-content:space-between}
  .card-doc .r{display:grid;grid-template-columns:7.2rem 1fr;gap:12px;padding:11px 16px;border-bottom:1px solid var(--line);font-family:var(--mono);font-size:.8rem}
  .card-doc .r:last-child{border-bottom:0}
  .card-doc .r dt{color:var(--soft);font-size:.62rem;letter-spacing:.08em;text-transform:uppercase;align-self:center}
  .card-doc .r dd{margin:0}

  /* problem (dark) */
  .dark{background:var(--dark);color:var(--on-dark)}
  .dark .kick{color:var(--accent2)}.dark .kick::before{background:var(--accent2)}
  .dark .lede{color:var(--on-dark-soft)}
  .problem{display:grid;grid-template-columns:1fr;gap:clamp(26px,4vw,50px);align-items:center}
  @media(min-width:820px){.problem{grid-template-columns:.8fr 1.2fr}}
  .bignum{font-family:var(--mono);font-weight:600;font-size:clamp(3.6rem,10vw,6rem);line-height:.9;color:#fff}
  .bignum small{display:block;font-size:.78rem;letter-spacing:.05em;text-transform:uppercase;color:var(--on-dark-soft);margin-top:14px;border-left:2px solid var(--accent2);padding-left:12px;max-width:28ch;font-weight:400;line-height:1.5}
  .problem p{font-size:clamp(1.1rem,1.9vw,1.4rem);line-height:1.5;color:#fff}
  .problem p b{color:var(--accent2)}

  /* steps */
  .ledger{border-top:1px solid var(--ink);margin-top:6px}
  .step{display:grid;grid-template-columns:2.6rem 1fr;gap:clamp(14px,3vw,34px);padding:clamp(22px,3vw,32px) 0;border-bottom:1px solid var(--line)}
  @media(min-width:760px){.step{grid-template-columns:4rem 1fr}}
  .step .n{font-family:var(--mono);font-weight:600;color:var(--accent)}
  .step .hd{display:flex;flex-wrap:wrap;align-items:baseline;gap:8px 14px}
  .step h3{font-size:clamp(1.1rem,1.9vw,1.4rem)}
  .step .tag{font-family:var(--mono);font-size:.74rem;background:var(--panel);border:1px solid var(--line2);padding:3px 9px;border-radius:5px}
  .step p{color:var(--soft);margin-top:10px;max-width:62ch}

  /* evidence pack callout */
  .evi{display:grid;grid-template-columns:1fr;gap:26px;align-items:center;background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:clamp(24px,4vw,40px)}
  @media(min-width:820px){.evi{grid-template-columns:1.1fr .9fr}}
  .evi ul{list-style:none;margin:16px 0 0;padding:0;columns:2;column-gap:26px}
  .evi li{padding:6px 0 6px 22px;position:relative;font-size:.92rem;break-inside:avoid}
  .evi li::before{content:"";position:absolute;left:0;top:11px;width:9px;height:9px;border:1.6px solid var(--accent);border-radius:2px}
  @media(max-width:520px){.evi ul{columns:1}}
  .evi .dl{text-align:center;border:1px dashed var(--line2);border-radius:12px;padding:24px;background:var(--bg)}
  .evi .dl .big{font-family:var(--mono);font-size:.7rem;letter-spacing:.1em;text-transform:uppercase;color:var(--soft)}
  .evi .dl h3{margin:8px 0 14px;font-size:1.1rem}

  /* corridors + track + generic cards */
  .cards{display:grid;gap:20px;grid-template-columns:1fr}
  @media(min-width:720px){.cards{grid-template-columns:1fr 1fr}}
  .card{border:1px solid var(--line);border-radius:12px;padding:26px;background:var(--bg)}
  .card .t{font-family:var(--mono);font-size:.66rem;letter-spacing:.1em;text-transform:uppercase;color:var(--accent)}
  .card h3{font-size:1.2rem;margin:10px 0 8px}
  .card p{color:var(--soft)}
  .card.muted{background:var(--panel);border-style:dashed}
  .card.muted .t{color:var(--soft)}

  .split{display:grid;grid-template-columns:1fr;gap:clamp(26px,4vw,48px);align-items:center}
  @media(min-width:860px){.split{grid-template-columns:1fr 1fr}}
  .founder p,.indep p,.accr p{color:var(--soft);margin-top:12px}
  .indep{background:var(--panel);border:1px solid var(--line);border-left:3px solid var(--accent);border-radius:12px;padding:clamp(22px,3vw,32px)}
  .indep h2{font-size:1.3rem}
  .indep ul{margin:14px 0 0;padding-left:20px}.indep li{margin:6px 0;color:var(--ink)}
  .accr-list{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}
  .accr-list span{font-family:var(--mono);font-size:.78rem;border:1px solid var(--line2);border-radius:999px;padding:7px 13px;color:var(--ink)}

  /* faq */
  .faq{border-top:1px solid var(--ink)}
  .faq details{border-bottom:1px solid var(--line)}
  .faq summary{list-style:none;cursor:pointer;padding:20px 40px 20px 0;position:relative;font-weight:600;font-size:1.05rem}
  .faq summary::-webkit-details-marker{display:none}
  .faq summary::after{content:"+";position:absolute;right:4px;top:50%;transform:translateY(-50%);font-family:var(--mono);font-size:1.4rem;color:var(--accent)}
  .faq details[open] summary::after{content:"\2212"}
  .faq .a{padding:0 40px 22px 0;color:var(--soft);max-width:70ch}

  /* form */
  .req{display:grid;grid-template-columns:1fr;gap:clamp(26px,4vw,44px)}
  @media(min-width:880px){.req{grid-template-columns:.8fr 1.2fr}}
  .form{border:1px solid var(--line2);border-radius:14px;overflow:hidden;background:var(--bg)}
  .form .h{padding:13px 18px;border-bottom:1px solid var(--line);font-family:var(--mono);font-size:.66rem;letter-spacing:.12em;text-transform:uppercase;color:var(--soft);display:flex;justify-content:space-between}
  .form .b{padding:22px}
  .frow{display:grid;grid-template-columns:1fr;gap:16px}
  @media(min-width:560px){.frow.two{grid-template-columns:1fr 1fr}}
  .fld{display:flex;flex-direction:column;gap:6px;margin-bottom:16px}
  .fld label{font-family:var(--mono);font-size:.64rem;letter-spacing:.08em;text-transform:uppercase;color:var(--soft)}
  .fld label i{color:var(--accent);font-style:normal}
  .fld input,.fld select,.fld textarea{font:inherit;font-size:.98rem;color:var(--ink);background:var(--bg);border:1px solid var(--line2);border-radius:8px;padding:11px 12px;width:100%}
  .fld textarea{min-height:88px;resize:vertical}
  .fld input:focus,.fld select:focus,.fld textarea:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 14%,transparent)}
  .fld.hp{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}
  .ffoot{display:flex;flex-wrap:wrap;gap:12px 16px;align-items:center}
  .ffoot .p{font-size:.78rem;color:var(--soft);max-width:34ch}
  .fmsg{margin-top:14px;padding:12px 14px;border-radius:8px;font-size:.9rem;display:none;border:1px solid}
  .fmsg.ok{display:block;background:var(--panel);color:var(--accent);border-color:var(--accent)}
  .fmsg.err{display:block;background:#fbeaea;color:#a12a2a;border-color:#e3b3b3}
  .btn[disabled]{opacity:.6;cursor:progress}

  footer{background:var(--dark);color:var(--on-dark-soft);padding-block:36px 50px;font-size:.85rem}
  .foot{display:flex;flex-wrap:wrap;justify-content:space-between;gap:18px}
  .foot a{color:var(--on-dark)} .foot a:hover{color:#fff}
  .foot .cols{display:flex;gap:30px;flex-wrap:wrap}
  .disc{max-width:60ch;line-height:1.5;margin-top:18px;border-top:1px solid var(--dark-line);padding-top:16px}