/* Pursuit Readiness — shares the AI That Books house style.
   Paper and ink, one accent colour, Arial for text, Courier for anything labelled as data. */

:root{
  --paper:#f3f0e8; --ink:#151515; --muted:#66635d; --soft:#ddd8cb;
  --line:#222; --accent:#d7ff4f; --white:#fffefa;
  --max:1120px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);
  font-family:Arial,"Helvetica Neue",Helvetica,sans-serif;line-height:1.55;
  -webkit-font-smoothing:antialiased}
a{color:inherit}
::selection{background:var(--accent);color:#111}
.shell{width:min(calc(100% - 40px),var(--max));margin:auto}
.mono{font-family:"Courier New",monospace;font-size:11px;font-weight:700;
  text-transform:uppercase;letter-spacing:.14em;color:var(--muted)}
.skip{position:absolute;left:-9999px;top:8px;background:var(--accent);padding:10px 14px;z-index:60}
.skip:focus{left:8px}

/* nav */
.nav{position:sticky;top:0;z-index:30;background:var(--paper);border-bottom:1px solid var(--line)}
.nav-inner{min-height:66px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.wordmark{font-weight:900;letter-spacing:-.04em;font-size:20px;text-decoration:none}
.wordmark span{color:var(--muted);font-weight:700}
.nav-links{display:flex;gap:24px;align-items:center;
  font:700 12px/1 Arial,sans-serif;text-transform:uppercase;letter-spacing:.08em}
.nav-links a{text-decoration:none;min-height:44px;display:inline-flex;align-items:center}
.nav-links a:hover,.nav-links a:focus-visible{text-decoration:underline;text-underline-offset:5px}
.mobile-nav{display:none;position:relative}
.mobile-nav summary{min-height:44px;display:flex;align-items:center;cursor:pointer;
  font:800 11px/1 Arial,sans-serif;text-transform:uppercase;letter-spacing:.08em}
.mobile-nav div{position:absolute;right:0;top:48px;min-width:220px;background:var(--paper);
  border:1px solid var(--line);padding:8px}
.mobile-nav a{display:flex;align-items:center;min-height:44px;padding:0 10px;text-decoration:none;
  font:800 11px/1 Arial,sans-serif;text-transform:uppercase;letter-spacing:.07em;
  border-bottom:1px solid var(--soft)}

/* hero */
.hero{border-bottom:1px solid var(--line)}
.hero-inner{padding:74px 0 62px}
.eyebrow{display:inline-block;font:700 11px/1.4 "Courier New",monospace;
  text-transform:uppercase;letter-spacing:.14em;color:var(--muted);margin-bottom:24px}
.hero h1{font-size:clamp(42px,7vw,80px);line-height:.94;letter-spacing:-.035em;
  margin:0 0 26px;font-weight:900;max-width:16ch}
.hero h1 em{font-style:normal;background:var(--accent);padding:0 .1em}
.hero-lead{font-size:clamp(17px,2.1vw,21px);max-width:62ch;color:#333;margin:0 0 32px}
.actions{display:flex;gap:12px;flex-wrap:wrap}
.button{display:inline-flex;align-items:center;justify-content:center;min-height:48px;
  padding:0 22px;background:var(--ink);color:var(--white);text-decoration:none;
  font:800 12px/1 Arial,sans-serif;text-transform:uppercase;letter-spacing:.09em;
  border:1px solid var(--ink)}
.button.alt{background:transparent;color:var(--ink)}
.button:hover,.button:focus-visible{background:var(--accent);color:#111;border-color:var(--ink)}

/* proof strip */
.proof-strip{background:var(--ink);color:var(--white)}
.proof-grid{display:grid;grid-template-columns:repeat(4,1fr)}
.proof{padding:26px 22px;border-right:1px solid #3a3a3a}
.proof:last-child{border-right:0}
.proof b{display:block;font-size:clamp(24px,3.4vw,36px);letter-spacing:-.03em;font-weight:900;
  color:var(--accent);line-height:1}
.proof span{display:block;margin-top:9px;font-size:13px;color:#cfcabd;line-height:1.4}

/* sections */
.section{padding:88px 0;border-bottom:1px solid var(--line)}
.section-head{display:grid;grid-template-columns:170px minmax(0,1fr);gap:26px;margin-bottom:44px}
.section-head h2{font-size:clamp(30px,4.4vw,50px);line-height:1;letter-spacing:-.035em;
  margin:0 0 14px;font-weight:900}
.section-head p{margin:0;max-width:64ch;color:#3b3b3b}

/* numbered stage list */
.stages{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}
.stage{display:grid;grid-template-columns:62px minmax(0,1fr);gap:20px;
  padding:24px 0;border-bottom:1px solid var(--soft)}
.stage .n{font-family:"Courier New",monospace;font-weight:700;font-size:13px;color:var(--muted);
  padding-top:3px}
.stage h3{margin:0 0 7px;font-size:19px;letter-spacing:-.015em}
.stage p{margin:0;color:#3b3b3b;max-width:70ch}
.stage .who{display:inline-block;margin-top:9px;font-family:"Courier New",monospace;font-size:10px;
  font-weight:700;text-transform:uppercase;letter-spacing:.1em;padding:3px 8px;
  border:1px solid var(--line)}
.who.sys{background:var(--ink);color:var(--white)}
.who.agent{background:var(--accent);color:#111}
.who.human{background:var(--white)}

/* rule cards */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:1px;
  background:var(--line);border:1px solid var(--line)}
.card{background:var(--paper);padding:26px 24px}
.card h3{margin:0 0 10px;font-size:17px;letter-spacing:-.015em}
.card p{margin:0;color:#3b3b3b;font-size:15px}
.card code{display:block;margin-top:14px;font-family:"Courier New",monospace;font-size:11px;
  color:var(--muted);letter-spacing:.03em}
.card.block{background:#fff6f3}
.card.block h3 code{font-family:"Courier New",monospace;font-size:11px;background:var(--ink);
  color:var(--accent);padding:2px 7px;letter-spacing:.06em}
.card.flag{background:#fffdf2}

/* table */
table{width:100%;border-collapse:collapse;margin-top:8px}
caption{text-align:left;font:700 11px/1.4 "Courier New",monospace;text-transform:uppercase;
  letter-spacing:.12em;color:var(--muted);padding-bottom:12px}
th,td{text-align:left;padding:13px 14px 13px 0;border-bottom:1px solid var(--soft);
  vertical-align:top;font-size:15px}
th{font:700 11px/1.3 "Courier New",monospace;text-transform:uppercase;letter-spacing:.09em;
  color:var(--muted);border-bottom:1px solid var(--line)}
td.num{font-family:"Courier New",monospace;font-weight:700;white-space:nowrap}

/* terminal block */
.term{background:#101010;color:#e8e4d8;padding:24px 22px;overflow-x:auto;
  border:1px solid var(--line)}
.term pre{margin:0;font-family:"Courier New",monospace;font-size:12.5px;line-height:1.7}
.term .ok{color:var(--accent)}
.term .dim{color:#8b8578}

/* callout */
.callout{border:1px solid var(--line);border-left:6px solid var(--accent);
  background:var(--white);padding:22px 24px;margin-top:26px}
.callout p{margin:0;color:#333}
.callout strong{font-weight:800}

/* contact */
.contact{background:var(--ink);color:var(--white);padding:86px 0}
.contact h2{font-size:clamp(30px,5vw,58px);line-height:1;letter-spacing:-.035em;margin:0 0 18px;
  font-weight:900;max-width:20ch}
.contact p{color:#cfcabd;max-width:60ch;margin:0 0 28px}
.contact .button{background:var(--accent);color:#111;border-color:var(--accent)}
.contact .button:hover,.contact .button:focus-visible{background:var(--white);border-color:var(--white)}

/* footer */
.footer{padding:30px 0;font-size:13px;color:var(--muted)}
.footer-inner{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap}

.reveal{opacity:0;transform:translateY(14px);transition:opacity .5s,transform .5s}
.reveal.visible{opacity:1;transform:none}
@media(prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}}

@media(max-width:900px){
  .proof-grid{grid-template-columns:1fr 1fr}
  .proof:nth-child(2){border-right:0}
  .proof:nth-child(-n+2){border-bottom:1px solid #3a3a3a}
  .section-head{grid-template-columns:1fr;gap:14px}
}
@media(max-width:620px){
  .shell{width:min(calc(100% - 26px),var(--max))}
  .nav-links{display:none}
  .mobile-nav{display:block}
  .hero-inner{padding:52px 0 46px}
  .section{padding:64px 0}
  .stage{grid-template-columns:44px minmax(0,1fr);gap:14px}
  .actions{display:grid}
  .button{width:100%}
}