/* OltenAI — technical datasheet design system. See SITE.md */
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --paper:#F4F5F1;
  --paper-raised:#FBFBF9;
  --ink:#15171B;
  --blue:#2337FF;
  --signal:#FF4D00;
  --gray:#5C6470;
  --line:#D6D9D0;
  --line-ink:rgba(244,245,241,.18);
  --font-display:'Archivo',sans-serif;
  --font-body:'IBM Plex Sans',sans-serif;
  --font-mono:'IBM Plex Mono',monospace;
  --maxw:1140px;
}
html{scroll-behavior:smooth}
body{font-family:var(--font-body);background:var(--paper);color:var(--ink);line-height:1.65;font-size:1.0625rem;-webkit-font-smoothing:antialiased}
::selection{background:var(--blue);color:#fff}
a{color:var(--blue)}
img{max-width:100%}

/* ---------- primitives ---------- */
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 1.5rem}
.eyebrow{font-family:var(--font-mono);font-size:.75rem;letter-spacing:.14em;text-transform:uppercase;color:var(--blue);display:flex;align-items:center;gap:.75rem;margin-bottom:1.25rem}
.eyebrow::before{content:'';width:2rem;height:1px;background:var(--blue)}
h1,h2,h3{font-family:var(--font-display);font-stretch:115%;letter-spacing:-.01em;line-height:1.05;text-transform:uppercase}
h1{font-size:clamp(2.4rem,5.6vw,4.3rem);font-weight:800}
h2{font-size:clamp(1.7rem,3.4vw,2.6rem);font-weight:800;margin-bottom:1rem}
h3{font-size:1.05rem;font-weight:700;font-stretch:110%;line-height:1.25}
.lead{font-size:clamp(1.05rem,1.8vw,1.25rem);color:var(--gray);max-width:38em}
section{padding:5.5rem 0}
.section-head{margin-bottom:3rem;max-width:44em}
.mono{font-family:var(--font-mono)}

.btn{display:inline-block;font-family:var(--font-mono);font-size:.85rem;letter-spacing:.06em;text-transform:uppercase;text-decoration:none;padding:.95rem 1.6rem;border:1px solid var(--ink);transition:background .2s,color .2s,border-color .2s}
.btn-solid{background:var(--blue);border-color:var(--blue);color:#fff}
.btn-solid:hover{background:var(--ink);border-color:var(--ink)}
.btn-ghost{color:var(--ink)}
.btn-ghost:hover{border-color:var(--blue);color:var(--blue)}
.on-ink .btn-ghost{color:var(--paper);border-color:var(--paper)}
.on-ink .btn-ghost:hover{border-color:var(--signal);color:var(--signal)}

/* ---------- nav ---------- */
nav.site{position:sticky;top:0;z-index:100;background:var(--paper);border-bottom:1px solid var(--line)}
nav.site .wrap{display:flex;align-items:center;justify-content:space-between;height:4rem}
.logo{font-family:var(--font-display);font-stretch:120%;font-weight:800;font-size:1.25rem;text-transform:uppercase;letter-spacing:-.01em;color:var(--ink);text-decoration:none}
.logo b{color:var(--blue);font-weight:800}
.nav-links{display:flex;gap:1.75rem;align-items:center}
.nav-links a{font-family:var(--font-mono);font-size:.8rem;letter-spacing:.06em;text-transform:uppercase;color:var(--ink);text-decoration:none}
.nav-links a:hover{color:var(--blue)}
.nav-links a.nav-cta{border:1px solid var(--blue);color:var(--blue);padding:.5rem .9rem}
.nav-links a.nav-cta:hover{background:var(--blue);color:#fff}
.lang{font-family:var(--font-mono);font-size:.8rem;color:var(--gray);white-space:nowrap}
.lang a{color:var(--gray);text-decoration:none;padding:.15rem .1rem}
.lang a:hover{color:var(--blue)}
.lang .active{color:var(--ink);border-bottom:2px solid var(--signal)}
@media (max-width:860px){
  .nav-links > a:not(.nav-cta){display:none}
  .nav-links{gap:1rem}
  .nav-links a.nav-cta{padding:.45rem .7rem;font-size:.72rem;white-space:nowrap}
}

/* ---------- hero ---------- */
.hero{padding:6rem 0 4rem;border-bottom:1px solid var(--line)}
.hero h1{max-width:11em;margin-bottom:1.5rem}
.hero h1 .alt{color:var(--blue)}
.hero .lead{margin-bottom:2.25rem}
.hero-actions{display:flex;gap:1rem;flex-wrap:wrap}

/* ---------- pipeline schematic (signature) ---------- */
.schematic{margin:4.5rem 0 0;overflow-x:auto}
.schematic svg{display:block;width:100%;min-width:640px;height:auto}
.schematic .box{fill:var(--paper-raised);stroke:var(--ink);stroke-width:1.25}
.schematic .box-accent{fill:var(--blue);stroke:var(--blue)}
.schematic .lbl{font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;fill:var(--ink)}
.schematic .lbl-inv{fill:#fff}
.schematic .lbl-dim{fill:var(--gray);font-size:9.5px}
.schematic .wire{fill:none;stroke:var(--ink);stroke-width:1.25}
.schematic .pulse{fill:none;stroke:var(--signal);stroke-width:2;stroke-dasharray:26 1200;stroke-dashoffset:0;animation:flow 5s linear infinite}
@keyframes flow{from{stroke-dashoffset:1226}to{stroke-dashoffset:0}}
.schematic .caption{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--gray);margin-top:.75rem}

/* ---------- fact strip ---------- */
.facts{border-bottom:1px solid var(--line);padding:1.1rem 0;background:var(--paper-raised)}
.facts .wrap{display:flex;gap:2.5rem;flex-wrap:wrap;justify-content:space-between}
.facts span{font-family:var(--font-mono);font-size:.75rem;letter-spacing:.08em;text-transform:uppercase;color:var(--gray);display:flex;align-items:center;gap:.6rem}
.facts span::before{content:'';width:7px;height:7px;background:var(--signal)}

/* ---------- service cards ---------- */
.svc-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(310px,1fr));gap:1px;background:var(--line);border:1px solid var(--line)}
.svc-card{background:var(--paper);padding:2rem;text-decoration:none;color:var(--ink);display:flex;flex-direction:column;gap:.9rem;transition:background .2s}
.svc-card:hover{background:var(--paper-raised)}
.svc-card .cat{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.12em;text-transform:uppercase;color:var(--blue)}
.svc-card p{color:var(--gray);font-size:.95rem;flex:1}
.svc-card .io{font-family:var(--font-mono);font-size:.72rem;color:var(--ink);border-top:1px solid var(--line);padding-top:.9rem;line-height:1.8}
.svc-card .io b{color:var(--blue);font-weight:500}
.svc-card:hover h3{color:var(--blue)}

/* ---------- principles ---------- */
.principles{border-top:1px solid var(--line)}
.prin-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:2.5rem}
.prin .k{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.1em;color:var(--signal);text-transform:uppercase;display:block;margin-bottom:.75rem}
.prin h3{margin-bottom:.6rem}
.prin p{color:var(--gray);font-size:.95rem}

/* ---------- process ---------- */
.process{border-top:1px solid var(--line)}
.proc-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:1px;background:var(--line);border:1px solid var(--line);counter-reset:step}
.proc-step{background:var(--paper);padding:2rem}
.proc-step .num{font-family:var(--font-mono);font-size:.75rem;color:var(--blue);display:flex;align-items:center;gap:.75rem;margin-bottom:1.1rem}
.proc-step .num::after{content:'';flex:1;height:1px;background:var(--line)}
.proc-step h3{margin-bottom:.6rem}
.proc-step p{color:var(--gray);font-size:.95rem}

/* ---------- stack ---------- */
.stack{border-top:1px solid var(--line);background:var(--paper-raised)}
.stack-grid{display:flex;flex-wrap:wrap;gap:1.25rem 3rem;align-items:center}
.stack-item{display:flex;align-items:center;gap:.6rem;font-family:var(--font-mono);font-size:.85rem;color:var(--gray)}
.stack-item img{height:20px;width:20px;filter:grayscale(1);opacity:.65;transition:filter .2s,opacity .2s}
.stack-item:hover img{filter:none;opacity:1}
.stack-item:hover{color:var(--ink)}

/* ---------- FAQ ---------- */
.faq{border-top:1px solid var(--line)}
.faq-list{border-top:1px solid var(--line);max-width:52em}
.faq-list details{border-bottom:1px solid var(--line)}
.faq-list summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:baseline;gap:2rem;padding:1.25rem 0;font-weight:600;font-size:1rem}
.faq-list summary::-webkit-details-marker{display:none}
.faq-list summary::after{content:'+';font-family:var(--font-mono);color:var(--blue);flex-shrink:0}
.faq-list details[open] summary::after{content:'–'}
.faq-list details p{padding:0 0 1.25rem;color:var(--gray);max-width:46em}

/* ---------- CTA band / footer (inverted datasheet) ---------- */
.cta-band{background:var(--ink);color:var(--paper);padding:5.5rem 0}
.cta-band h2{color:var(--paper)}
.cta-band .lead{color:#9aa0ab}
.cta-band .hero-actions{margin-top:2.25rem}
.cta-band .plain-mail{font-family:var(--font-mono);font-size:.85rem;color:#9aa0ab;margin-top:1.5rem}
.cta-band .plain-mail a{color:var(--paper)}
footer.site{background:var(--ink);color:#9aa0ab;border-top:1px solid var(--line-ink);padding:3.5rem 0 2.5rem;font-size:.9rem}
footer.site .cols{display:grid;grid-template-columns:2fr 1fr 1fr;gap:2.5rem}
footer.site h4{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;color:var(--paper);margin-bottom:1rem}
footer.site a{color:#9aa0ab;text-decoration:none;display:block;padding:.2rem 0}
footer.site a:hover{color:var(--paper)}
footer.site .brand{font-family:var(--font-display);font-stretch:120%;font-weight:800;text-transform:uppercase;color:var(--paper);font-size:1.1rem}
footer.site .fine{margin-top:2.5rem;padding-top:1.5rem;border-top:1px solid var(--line-ink);font-family:var(--font-mono);font-size:.72rem;display:flex;justify-content:space-between;flex-wrap:wrap;gap:1rem}
@media (max-width:760px){footer.site .cols{grid-template-columns:1fr}}

/* ---------- service page ---------- */
.crumbs{font-family:var(--font-mono);font-size:.72rem;letter-spacing:.06em;text-transform:uppercase;padding:1.25rem 0;color:var(--gray)}
.crumbs a{color:var(--gray);text-decoration:none}
.crumbs a:hover{color:var(--blue)}
.svc-hero{padding:3.5rem 0 4rem;border-bottom:1px solid var(--line)}
.svc-hero h1{font-size:clamp(2rem,4.6vw,3.4rem);max-width:14em;margin-bottom:1.25rem}
.io-strip{background:var(--paper-raised);border-bottom:1px solid var(--line);padding:1.5rem 0}
.io-strip .wrap{display:grid;grid-template-columns:1fr auto 1fr;gap:1.5rem;align-items:center}
.io-strip .cell{font-family:var(--font-mono);font-size:.8rem;line-height:1.8}
.io-strip .cell .k{color:var(--blue);letter-spacing:.12em;display:block;font-size:.7rem}
.io-strip .arrow{font-family:var(--font-mono);color:var(--signal);font-size:1.3rem}
@media (max-width:700px){.io-strip .wrap{grid-template-columns:1fr}.io-strip .arrow{transform:rotate(90deg);width:fit-content}}
.svc-body h2{font-size:clamp(1.35rem,2.6vw,1.9rem);margin-top:3.5rem}
.svc-body h2:first-child{margin-top:0}
.svc-body p{max-width:46em;color:#3a3f47;margin-top:.75rem}
.svc-body ul{max-width:46em;margin:1rem 0 0 1.1rem;color:#3a3f47}
.svc-body ul li{margin-bottom:.55rem}
.svc-body ul li b{color:var(--ink)}
.spec{margin-top:1.5rem;border:1px solid var(--line);max-width:52em;width:100%;border-collapse:collapse}
.spec th,.spec td{font-size:.85rem;text-align:left;padding:.8rem 1.1rem;border-bottom:1px solid var(--line);vertical-align:top}
.spec tr:last-child th,.spec tr:last-child td{border-bottom:none}
.spec th{font-family:var(--font-mono);font-weight:500;font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--gray);white-space:nowrap;width:11rem;background:var(--paper-raised)}
.related{border-top:1px solid var(--line)}
.related .svc-grid{grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}

/* ---------- legal pages ---------- */
.legal{padding:4rem 0 5.5rem}
.legal .wrap{max-width:820px}
.legal h1{font-size:clamp(2rem,4.2vw,3rem);margin-bottom:2.5rem}
.legal h2{font-size:1rem;margin:2.5rem 0 .6rem;color:var(--ink)}
.legal p,.legal address{color:#3a3f47;font-size:.95rem;font-style:normal}
.legal p+p{margin-top:.6rem}
.legal ul{list-style:none;margin:.75rem 0 0;color:#3a3f47;font-size:.95rem}
.legal ul li{padding:.2rem 0 .2rem 1.2rem;position:relative}
.legal ul li::before{content:'';position:absolute;left:0;top:.72em;width:7px;height:7px;background:var(--blue)}
.legal .stand{margin-top:3rem;font-family:var(--font-mono);font-size:.78rem;color:var(--gray);border-top:1px solid var(--line);padding-top:1.25rem}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
.reveal.visible{opacity:1;transform:none}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .schematic .pulse{animation:none;stroke-dasharray:none;opacity:0}
  .reveal{opacity:1;transform:none;transition:none}
  *{transition-duration:.01ms!important;animation-duration:.01ms!important}
}
@media (max-width:700px){
  section{padding:3.5rem 0}
  .hero{padding:3.5rem 0 3rem}
  h1{font-size:clamp(1.6rem,7.2vw,2.6rem);hyphens:auto}
  .facts .wrap{gap:.9rem;flex-direction:column}
}