/* Understanding AI — shared styles (matches oakweb.ai homepage) */
:root{
  --bg:#0A0A0B; --panel:#141416; --panel2:#101012; --line:rgba(236,231,221,.09);
  --line2:rgba(236,231,221,.15); --txt:#ECE7DD; --muted:#8A8A8F; --dim:#5c5c62;
  --ember:#E0762E; --ember-soft:rgba(224,118,46,.14);
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{margin:0;background:var(--bg);color:var(--txt);font-family:'Hanken Grotesk',system-ui,sans-serif;-webkit-font-smoothing:antialiased;line-height:1.65;}
a{color:var(--txt);text-decoration:none;transition:color .15s;}
a:hover{color:var(--ember);}
::selection{background:var(--ember);color:var(--bg);}
h1,h2,h3,h4{margin:0;line-height:1.08;letter-spacing:-.01em;}
.anton{font-family:'Anton',sans-serif;text-transform:uppercase;letter-spacing:.01em;}
.mono{font-family:'IBM Plex Mono','SF Mono',ui-monospace,Menlo,Consolas,monospace;}
.script{font-family:'Marck Script',cursive;}
.wrap{max-width:1040px;margin:0 auto;padding:0 6vw;}
.narrow{max-width:760px;}
img,video{max-width:100%;}
@keyframes blink{0%,49%{opacity:1}50%,100%{opacity:0}}

/* ---------- header ---------- */
.site-head{position:fixed;top:0;left:0;right:0;z-index:70;display:flex;align-items:center;justify-content:space-between;padding:14px 6vw;background:linear-gradient(180deg,rgba(10,10,11,.94),rgba(10,10,11,0));backdrop-filter:blur(3px);}
.site-head .brand{display:flex;align-items:center;gap:11px;}
.site-head .brand span{font-family:'IBM Plex Mono',monospace;font-size:13px;letter-spacing:.22em;}
.site-nav{display:flex;gap:26px;align-items:center;font-family:'IBM Plex Mono',monospace;font-size:12px;letter-spacing:.16em;}
.site-nav a{color:var(--muted);}
.site-nav a.cta{color:var(--txt);border:1px solid rgba(236,231,221,.25);padding:8px 15px;}
.site-nav a.cta:hover{background:var(--ember);color:var(--bg);border-color:var(--ember);}

/* ---------- breadcrumb ---------- */
.crumbs{font-family:'IBM Plex Mono',monospace;font-size:12px;letter-spacing:.12em;color:var(--dim);padding-top:100px;}
.crumbs a{color:var(--muted);}
.crumbs .sep{color:var(--dim);margin:0 8px;}

/* ---------- hero ---------- */
.hero{position:relative;padding:40px 0 60px;}
.eyebrow{font-family:'IBM Plex Mono',monospace;font-size:13px;letter-spacing:.5em;color:var(--muted);margin-bottom:16px;}
.hero h1{font-size:clamp(44px,7vw,104px);margin-bottom:20px;}
.hero .lede{font-size:clamp(18px,2.2vw,22px);color:var(--txt);max-width:60ch;}
.hero .rule{width:64px;height:3px;background:var(--ember);margin:22px 0;}

/* ---------- terminal ---------- */
.term{background:#0c0c0d;border:1px solid var(--line2);border-radius:9px;overflow:hidden;font-family:'IBM Plex Mono',monospace;box-shadow:0 20px 60px rgba(0,0,0,.5);}
.term-head{background:#151515;border-bottom:1px solid var(--line);padding:10px 15px;display:flex;align-items:center;gap:7px;}
.term-dot{width:11px;height:11px;border-radius:50%;display:inline-block;}
.term-title{margin-left:9px;font-size:11px;color:#6a6a6a;letter-spacing:.05em;}
.term-body{padding:18px 20px;height:var(--term-h,420px);overflow-y:auto;font-size:13.5px;line-height:1.75;white-space:pre-wrap;word-break:break-word;}
.term-body::-webkit-scrollbar{width:8px;}
.term-body::-webkit-scrollbar-thumb{background:#2a2a2a;border-radius:4px;}
.t-prompt{color:var(--ember);}
.t-cmd{color:#ECE7DD;}
.t-comment{color:var(--dim);}
.t-out{color:#9aa0a6;}
.t-ok{color:#5a8a5a;}
.t-key{color:var(--ember);}
.t-user{color:#8ab4ff;}
.t-model{color:#ECE7DD;}
.t-cursor{display:inline-block;width:8px;height:15px;background:var(--ember);vertical-align:text-bottom;animation:blink 1.1s steps(1) infinite;}

/* ---------- concept video ---------- */
.clip{position:relative;border:1px solid var(--line);border-radius:12px;overflow:hidden;background:#0c0c0d;aspect-ratio:16/9;}
.clip video{width:100%;height:100%;object-fit:cover;display:block;}
.clip .cap{position:absolute;left:12px;bottom:10px;font-family:'IBM Plex Mono',monospace;font-size:11px;letter-spacing:.12em;color:#cfcac1;background:rgba(10,10,11,.7);padding:5px 10px;border-radius:6px;backdrop-filter:blur(4px);}

/* ---------- prose ---------- */
.prose{padding:20px 0 40px;}
.prose section{padding:44px 0;border-top:1px solid var(--line);}
.sec-num{font-family:'IBM Plex Mono',monospace;font-size:12px;letter-spacing:.5em;color:var(--muted);margin-bottom:16px;}
.prose h2{font-size:clamp(28px,4vw,44px);margin-bottom:16px;}
.prose h3{font-size:20px;margin:28px 0 10px;color:var(--txt);}
.prose p{font-size:17px;color:#c9c6bf;margin:0 0 16px;max-width:70ch;}
.prose strong{color:var(--txt);font-weight:600;}
.prose ul{color:#c9c6bf;font-size:17px;max-width:70ch;padding-left:20px;}
.prose li{margin:8px 0;}
.prose a{color:var(--ember);text-decoration:underline;text-underline-offset:3px;}
.callout{border-left:3px solid var(--ember);background:linear-gradient(90deg,var(--ember-soft),transparent 70%);padding:16px 20px;border-radius:0 8px 8px 0;margin:22px 0;}
.callout .lbl{font-family:'IBM Plex Mono',monospace;font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--ember);margin-bottom:6px;}
.callout p{margin:0;color:#d9d5cd;font-size:15.5px;}

/* comparison cards / chips */
.cards{display:grid;gap:16px;margin:24px 0;}
.cards.c3{grid-template-columns:repeat(3,1fr);}
.cards.c2{grid-template-columns:repeat(2,1fr);}
.card{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:22px 22px;}
.card .k{font-family:'IBM Plex Mono',monospace;font-size:12px;letter-spacing:.18em;color:var(--ember);margin-bottom:8px;}
.card h4{font-size:19px;margin-bottom:8px;}
.card p{font-size:14.5px;color:var(--muted);margin:0;line-height:1.6;}
.card .stat{font-family:'Anton',sans-serif;font-size:30px;color:var(--txt);line-height:1;margin-bottom:6px;}

/* topic index (hub) */
.topics{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:8px 0 20px;}
.topic{display:block;background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:26px 26px;transition:border-color .2s,transform .2s;}
.topic:hover{border-color:#3d3d3d;transform:translateY(-2px);color:var(--txt);}
.topic .n{font-family:'IBM Plex Mono',monospace;font-size:12px;color:var(--ember);letter-spacing:.2em;}
.topic h3{font-size:23px;margin:10px 0 8px;}
.topic p{color:var(--muted);font-size:15px;margin:0;}
.topic .go{font-family:'IBM Plex Mono',monospace;font-size:12px;color:var(--muted);letter-spacing:.16em;margin-top:14px;display:inline-block;}
.topic:hover .go{color:var(--ember);}

/* faq */
.faq-item{border-top:1px solid var(--line);padding:24px 0 6px;}
.faq-item:first-of-type{border-top:none;padding-top:6px;}
.faq-item h3{margin:0 0 10px;font-size:19px;}
.faq-item p{margin:0 0 12px;}

/* nextprev + cta */
.nextprev{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;border-top:1px solid var(--line);padding:30px 0;font-family:'IBM Plex Mono',monospace;font-size:13px;letter-spacing:.1em;}
.pill{display:inline-flex;align-items:center;gap:10px;border:1px solid rgba(236,231,221,.35);padding:14px 24px;border-radius:8px;font-family:'IBM Plex Mono',monospace;font-size:13px;letter-spacing:.14em;color:var(--txt);}
.pill:hover{background:var(--ember);border-color:var(--ember);color:var(--bg);}

/* footer */
.site-foot{border-top:1px solid var(--line);margin-top:20px;}
.foot-dir{display:grid;grid-template-columns:repeat(4,1fr);gap:28px;padding:44px 6vw;max-width:1040px;margin:0 auto;}
.foot-dir .h{font-family:'IBM Plex Mono',monospace;font-size:11px;letter-spacing:.28em;color:var(--dim);margin-bottom:14px;}
.foot-dir a{display:block;color:var(--muted);font-size:14px;padding:5px 0;}
.foot-bar{border-top:1px solid var(--line);padding:20px 6vw;max-width:1040px;margin:0 auto;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-family:'IBM Plex Mono',monospace;font-size:11px;color:var(--dim);letter-spacing:.1em;}

@media (max-width:820px){
  .site-nav{display:none;}
  .topics,.cards.c3,.cards.c2,.foot-dir{grid-template-columns:1fr;}
  .term-body{--term-h:340px;}
  .hero h1{font-size:clamp(38px,12vw,60px);}
}