/* ontologyrepository.com - Common Core Ontologies.
   Reference: clearbit.com / refero. Light, flat, shadowless enterprise-data system:
   near-white canvas, midnight-navy ink, electric blue on actions only, lavender
   section washes, single Inter typeface, hairline frost borders, no drop shadows. */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root{
  /* achromatic canvas, single navy ink, one electric blue for actions */
  --bg:#ffffff; --bg-2:#f5f3ff; --surface:#ffffff; --surface-2:#f7f8fb;
  --lav:#f5f3ff;
  --line:#eceaf5; --line-2:#ddd9ef;
  --ink:#0b1030; --ink-soft:#3a3f5c; --muted:#6b7088; --faint:#9a9fb5;
  --muted-2:#6b7386;
  --blue:#3b6bff; --blue-hi:#4f7cff; --violet:#7c5cff; --indigo:#6d5efc; --cyan:#3b6bff;
  --accent:#4f7cff; --accent-2:#7c5cff;
  /* clearbit-style blue->violet gradient for the primary pill / glows */
  --grad:linear-gradient(120deg,#4f7cff 0%,#8257ff 100%);
  --grad-soft:linear-gradient(120deg,rgba(79,124,255,.12),rgba(124,92,255,.10));
  --r-sm:10px; --r:12px; --r-lg:16px; --r-xl:22px;
  --shadow:0 1px 2px rgba(11,16,48,.04),0 12px 34px -14px rgba(11,16,48,.14);
  --shadow-lg:0 30px 70px -30px rgba(56,52,140,.32);
  --glow:0 0 0 1px var(--line-2);
  --maxw:1200px;
  --sans:'Inter',system-ui,-apple-system,sans-serif;
  --body:'Inter',system-ui,-apple-system,sans-serif;
  --mono:'JetBrains Mono',ui-monospace,SFMono-Regular,Menlo,monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
html,body{overflow-x:clip}
body{
  margin:0;background:var(--bg);color:var(--ink);font-family:var(--body);
  font-size:16px;line-height:1.5;-webkit-font-smoothing:antialiased;
  letter-spacing:.004em;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block;height:auto}
/* single typeface; positive letter-spacing widens with size (refero signature) */
h1,h2,h3,h4{font-family:var(--sans);font-weight:600;letter-spacing:.006em;line-height:1.25;margin:0;color:var(--ink)}
p{margin:0 0 1rem}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.narrow{max-width:820px;margin:0 auto;padding:0 24px}
.mono{font-family:var(--mono);letter-spacing:0}
.grad-text{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}

/* ---- header ---- */
.hdr{position:sticky;top:0;z-index:50;backdrop-filter:blur(10px);
  background:rgba(255,255,255,.82);border-bottom:1px solid var(--line)}
.hdr-in{display:flex;align-items:center;gap:28px;height:66px;max-width:var(--maxw);margin:0 auto;padding:0 24px}
.brand{display:flex;align-items:center;gap:11px;font-family:var(--sans);font-weight:600;font-size:16px;letter-spacing:.004em;color:var(--ink)}
.brand .mark{width:30px;height:30px;flex:0 0 auto}
.nav{display:flex;align-items:center;gap:26px;margin-left:6px}
.nav a{color:var(--ink-soft);font-size:15px;font-weight:500;transition:color .2s}
.nav a:hover,.nav a.is-active{color:var(--ink)}
.hdr-cta{margin-left:auto;display:flex;align-items:center;gap:14px}
.btn{display:inline-flex;align-items:center;gap:8px;font-family:var(--sans);font-weight:500;
  font-size:15px;border-radius:var(--r-sm);padding:12px 20px;transition:background .2s,box-shadow .2s,transform .15s;cursor:pointer;border:1px solid transparent}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--grad);color:#fff;font-weight:600;box-shadow:0 10px 26px -10px rgba(90,84,220,.55)}
.btn-primary:hover{filter:brightness(1.06);transform:translateY(-1px)}
.btn-primary:focus-visible{outline:0;box-shadow:0 0 0 3px rgba(124,92,255,.35)}
.btn-ghost{background:#fff;color:var(--ink);border:1px solid var(--line-2)}
.btn-ghost:hover{background:var(--lav);border-color:var(--violet)}
.btn-lg{padding:14px 26px;font-size:16px;border-radius:999px}
.burger{display:none;margin-left:auto;background:#fff;border:1px solid var(--line-2);border-radius:var(--r-sm);padding:8px 12px;color:var(--ink);cursor:pointer;font:inherit;font-size:14px}

/* ---- hero (CENTERED editorial stack, clearbit.com reference) ---- */
.hero{position:relative;padding:108px 0 56px;overflow:hidden;text-align:center}
/* soft radial blue->violet glow bloom behind the hero, like the reference */
.hero::before{content:"";position:absolute;left:50%;top:-140px;transform:translateX(-50%);
  width:min(1100px,120vw);height:640px;pointer-events:none;z-index:0;
  background:
    radial-gradient(closest-side,rgba(124,92,255,.20),transparent 72%) 38% 40%/60% 70% no-repeat,
    radial-gradient(closest-side,rgba(79,124,255,.20),transparent 72%) 64% 34%/58% 66% no-repeat;
  filter:blur(6px)}
.hero .wrap{position:relative;z-index:1}
.hero-mid{max-width:860px;margin:0 auto;display:flex;flex-direction:column;align-items:center}
.eyebrow{display:inline-flex;align-items:center;gap:9px;font-family:var(--sans);font-size:13px;font-weight:600;
  letter-spacing:.02em;color:var(--indigo);
  border:1px solid var(--line-2);border-radius:999px;padding:7px 15px;background:#fff;box-shadow:var(--shadow)}
.eyebrow .dot{width:7px;height:7px;border-radius:50%;background:var(--grad)}
/* floating glassy icon badge that sits above the headline (reference signature) */
.hero-badge{width:74px;height:74px;border-radius:20px;display:grid;place-items:center;margin:0 0 30px;
  background:linear-gradient(180deg,#fff,#f7f6ff);border:1px solid var(--line-2);box-shadow:var(--shadow-lg)}
.hero-badge svg{width:38px;height:38px}
.hero h1{font-size:clamp(40px,6vw,72px);margin:22px 0 0;font-weight:700;letter-spacing:-.02em;line-height:1.04;max-width:16ch}
.hero .lead{font-size:clamp(17px,1.5vw,21px);color:var(--muted);max-width:60ch;margin:24px 0 34px;line-height:1.55}
.hero-cta{display:flex;gap:14px;flex-wrap:wrap;justify-content:center}
.hero-stat{display:flex;gap:44px;margin:56px auto 0;padding-top:30px;border-top:1px solid var(--line);justify-content:center;flex-wrap:wrap}
.hero-stat .n{font-family:var(--sans);font-weight:700;font-size:32px;line-height:1;letter-spacing:-.01em}
.hero-stat .k{color:var(--muted);font-size:13.5px;margin-top:6px}
/* floating hero visual sits below, suspended with a soft shadow */
.hero-visual{position:relative;max-width:880px;margin:56px auto 0;aspect-ratio:16/8.4;border-radius:var(--r-xl);overflow:hidden;
  border:1px solid var(--line);background:var(--lav);box-shadow:var(--shadow-lg)}
.hero-visual img{width:100%;height:100%;object-fit:cover}
.hero-visual .svg-net{position:absolute;inset:0}

/* ---- generic section ---- */
.sec{padding:88px 0;position:relative}
.sec-wash{background:var(--lav)}
.sec-head{max-width:760px;margin:0 0 48px}
.sec-head.center{margin-left:auto;margin-right:auto;text-align:center;max-width:720px}
.sec-head h2{font-size:clamp(28px,3.6vw,46px);letter-spacing:-.018em;line-height:1.08}
.sec-head p{color:var(--muted);font-size:18px;margin-top:16px;line-height:1.6}
.sec-head.center p{margin-left:auto;margin-right:auto;max-width:58ch}
/* violet micro-eyebrow above section headings, reference-style */
.kicker{font-family:var(--sans);font-size:13px;font-weight:600;letter-spacing:.04em;text-transform:uppercase;color:var(--indigo);margin-bottom:14px;display:block}
/* centered editorial prose block (clearbit "A data foundation you can build on") */
.prose-center{max-width:640px;margin:0 auto;text-align:center}
.prose-center p{color:var(--muted);font-size:18px;line-height:1.7;margin:0 0 18px}
.prose-center p:last-child{margin-bottom:0}
/* soft-shadowed logo/brand cards row */
.logos{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:10px}
.logo-card{display:flex;align-items:center;gap:13px;padding:18px 20px;border-radius:var(--r-lg);
  background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);transition:transform .25s,box-shadow .25s}
.logo-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-lg)}
.logo-card .lg{width:42px;height:42px;flex:0 0 auto;border-radius:12px;display:grid;place-items:center;
  background:var(--lav);border:1px solid var(--line-2)}
.logo-card .lg svg{width:22px;height:22px}
.logo-card .lt{font-family:var(--sans);font-weight:600;font-size:15px;letter-spacing:.002em}
.logo-card .ls{color:var(--muted);font-size:12.5px;margin-top:2px}

/* ---- feature split (Z-pattern, floating mockup) ---- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.split.rev .split-txt{order:2}
.split-txt h3{font-size:clamp(24px,2.6vw,32px);margin-bottom:16px;letter-spacing:.01em}
.split-txt p{color:var(--ink-soft);line-height:1.55}
/* keep the CTA aligned to the left edge of the text column (it must not drift to centre) */
.split-txt .hero-cta{justify-content:flex-start}
.split-list{list-style:none;padding:0;margin:22px 0 0;display:grid;gap:12px}
.split-list li{display:flex;gap:12px;align-items:flex-start;color:var(--ink-soft);font-size:15.5px}
.split-list .tick{flex:0 0 auto;width:22px;height:22px;border-radius:6px;background:var(--lav);
  border:1px solid var(--line-2);display:grid;place-items:center;margin-top:1px}
.split-list .tick svg{width:12px;height:12px}
.panel{border:1px solid var(--line);border-radius:var(--r-lg);background:var(--lav);
  padding:28px;position:relative;overflow:hidden;box-shadow:var(--shadow-lg)}
.panel-img{border-radius:var(--r-lg);overflow:hidden;border:1px solid var(--line);background:var(--lav);box-shadow:var(--shadow-lg)}

/* ---- bento ---- */
.bento{display:grid;grid-template-columns:repeat(6,1fr);gap:18px}
.card{border:1px solid var(--line);border-radius:var(--r-lg);background:var(--surface);
  padding:24px;position:relative;overflow:hidden;box-shadow:var(--shadow);transition:box-shadow .25s,transform .25s}
.card:hover{box-shadow:var(--shadow-lg);transform:translateY(-3px)}
.card h4{font-size:19px;margin-bottom:9px;letter-spacing:.006em}
.card p{color:var(--muted);font-size:14.5px;margin:0;line-height:1.5}
.card .ico{width:40px;height:40px;border-radius:10px;background:var(--lav);border:1px solid var(--line-2);
  display:grid;place-items:center;margin-bottom:16px}
.card .ico svg{width:20px;height:20px}
.card.wide{grid-column:span 4}.card.mid{grid-column:span 3}.card.third{grid-column:span 2}
.card.feat{grid-column:span 4;background:var(--lav)}
.card .big{font-family:var(--sans);font-weight:700;font-size:42px;color:var(--blue-hi);line-height:1;letter-spacing:.01em}

/* ---- module list ---- */
.mods{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.mod{display:flex;gap:16px;padding:22px;border:1px solid var(--line);border-radius:var(--r-lg);
  background:var(--surface);box-shadow:var(--shadow);transition:box-shadow .25s,transform .25s}
.mod:hover{box-shadow:var(--shadow-lg);transform:translateY(-3px)}
.mod .n{font-family:var(--mono);font-size:13px;color:var(--blue-hi);flex:0 0 auto;padding-top:3px}
.mod h4{font-size:17px;margin-bottom:5px;letter-spacing:.006em}
.mod p{font-size:14px;color:var(--muted);margin:0;line-height:1.5}

/* ---- term / relation pages ---- */
.crumb{font-family:var(--mono);font-size:12.5px;color:var(--muted);margin:0 0 22px;display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.crumb a:hover{color:var(--ink)}
.crumb .sep{color:var(--faint)}
.term-head{display:flex;align-items:center;gap:14px;flex-wrap:wrap;margin-bottom:10px}
.term-head h1{font-family:var(--mono);font-weight:500;font-size:clamp(28px,4vw,42px);letter-spacing:-.01em;color:var(--ink)}
.badge{font-family:var(--sans);font-size:11.5px;font-weight:600;text-transform:uppercase;letter-spacing:.08em;
  padding:5px 11px;border-radius:999px;border:1px solid var(--line-2)}
.badge.cls{color:var(--blue-hi);background:var(--lav)}
.badge.rel{color:#0a7a53;background:#e7f6ef;border-color:#bfe6d3}
.badge.dat{color:#8a6100;background:#fbf1d8;border-color:#eddcae}
.iri{font-family:var(--mono);font-size:13px;color:var(--muted);background:var(--surface-2);
  border:1px solid var(--line);border-radius:var(--r-sm);padding:12px 14px;margin:6px 0 30px;
  overflow-x:auto;white-space:nowrap;display:flex;align-items:center;gap:10px}
.iri .copy{margin-left:auto;flex:0 0 auto;cursor:pointer;color:var(--blue-hi);border:1px solid var(--line-2);
  border-radius:6px;padding:3px 9px;font-size:11px;background:#fff}
.term-lay{display:grid;grid-template-columns:1fr 340px;gap:40px;align-items:start}
.def{font-size:19px;color:var(--ink-soft);line-height:1.7}
.def strong{color:var(--ink)}
.meta{border:1px solid var(--line);border-radius:var(--r-lg);background:var(--lav);padding:22px;position:sticky;top:88px}
.meta h4{font-family:var(--sans);font-size:11.5px;font-weight:600;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin:0 0 8px}
.meta .row{margin-bottom:18px}
.meta .row:last-child{margin-bottom:0}
.chip{display:inline-flex;font-family:var(--mono);font-size:12.5px;color:var(--ink-soft);
  border:1px solid var(--line-2);border-radius:999px;padding:5px 12px;margin:4px 6px 0 0;transition:all .2s;background:#fff}
a.chip:hover{border-color:var(--blue);color:var(--blue-hi);background:var(--lav)}
.term-graph{margin:18px 0 0;border:1px solid var(--line);border-radius:var(--r-lg);background:var(--surface);overflow:hidden}
.subsec{margin-top:40px}
.subsec h3{font-size:22px;margin-bottom:12px;letter-spacing:.008em}
.subsec p{color:var(--ink-soft);line-height:1.6}

/* ---- index / directory ---- */
.dir-groups{display:grid;gap:34px}
.dir-group h3{font-size:20px;margin-bottom:6px;letter-spacing:.008em}
.dir-group .gd{color:var(--muted);font-size:14.5px;margin-bottom:16px}
.dir-list{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.dir-list a{font-family:var(--mono);font-size:13.5px;color:var(--ink-soft);padding:10px 13px;
  border:1px solid var(--line);border-radius:var(--r-sm);background:var(--surface);transition:all .2s;
  display:flex;justify-content:space-between;align-items:center;gap:8px}
.dir-list a:hover{border-color:var(--blue);color:var(--blue-hi);background:var(--lav);transform:translateX(2px)}
.dir-list a .t{font-family:var(--body);font-size:10px;color:var(--faint);text-transform:uppercase;letter-spacing:.08em}

/* ---- blog ---- */
.posts{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.post{border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden;background:var(--surface);
  box-shadow:var(--shadow);transition:transform .25s,box-shadow .25s}
.post:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}
.post .cov{aspect-ratio:16/9;background:var(--lav);overflow:hidden}
.post .cov img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.post:hover .cov img{transform:scale(1.04)}
.post .body{padding:22px}
.post .tag{font-family:var(--sans);font-size:11px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;color:var(--blue-hi)}
.post h3{font-size:19px;margin:10px 0 8px;line-height:1.3;letter-spacing:.006em}
.post p{color:var(--muted);font-size:14px;margin:0;line-height:1.5}
.article{max-width:760px;margin:0 auto}
.article h1{font-size:clamp(30px,4vw,46px);margin:14px 0 18px;line-height:1.12;letter-spacing:.012em}
.article .meta-line{font-family:var(--mono);font-size:13px;color:var(--muted);margin-bottom:26px}
.article .hero-cov{border-radius:var(--r-lg);overflow:hidden;border:1px solid var(--line);margin:0 0 34px}
.article h2{font-size:26px;margin:38px 0 14px;letter-spacing:.008em}
.article h3{font-size:20px;margin:28px 0 10px;letter-spacing:.006em}
.article p{color:var(--ink-soft);line-height:1.7}
.article ul{color:var(--ink-soft);padding-left:22px;display:grid;gap:8px;margin:0 0 18px;line-height:1.6}
.article code{font-family:var(--mono);font-size:.88em;background:var(--surface-2);border:1px solid var(--line);
  border-radius:6px;padding:2px 6px;color:var(--blue-hi)}
.callout{border:1px solid var(--line-2);border-left:3px solid var(--blue);border-radius:var(--r-lg);
  background:var(--lav);padding:20px 22px;margin:26px 0;color:var(--ink-soft)}

/* ---- cta band ---- */
.cta-band{position:relative;border-radius:var(--r-xl);overflow:hidden;padding:72px 48px;text-align:center;
  background:var(--grad);box-shadow:var(--shadow-lg)}
.cta-band::after{content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(closest-side,rgba(255,255,255,.22),transparent 70%) 20% -20%/70% 130% no-repeat}
.cta-band h2{font-size:clamp(28px,3.6vw,44px);letter-spacing:-.018em;color:#fff;position:relative}
.cta-band p{color:rgba(255,255,255,.9);max-width:52ch;margin:16px auto 28px;font-size:18px;line-height:1.55;position:relative}
.cta-band .hero-cta{justify-content:center;position:relative}
.cta-band .btn-primary{background:#fff;color:var(--indigo);box-shadow:0 10px 30px -10px rgba(0,0,0,.3)}
.cta-band .btn-ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.5)}
.cta-band .btn-ghost:hover{background:rgba(255,255,255,.12);border-color:#fff}

/* ---- footer ---- */
.ft{border-top:1px solid var(--line);margin-top:20px;padding:56px 0 40px;background:var(--surface-2)}
.ft-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px}
.ft h5{font-family:var(--sans);font-size:11.5px;font-weight:600;text-transform:uppercase;letter-spacing:.1em;color:var(--muted);margin:0 0 14px}
.ft a{display:block;color:var(--ink-soft);font-size:14.5px;margin-bottom:9px;transition:color .2s}
.ft a:hover{color:var(--blue-hi)}
.ft .desc{color:var(--muted);font-size:14px;max-width:34ch;margin-top:14px;line-height:1.55}
.ft-bot{border-top:1px solid var(--line);margin-top:40px;padding-top:24px;display:flex;justify-content:space-between;
  gap:16px;flex-wrap:wrap;color:var(--muted);font-size:13px}

/* ---- reveal motion (kept subtle; refero mockups feel suspended) ---- */
.reveal{opacity:0;transform:translateY(22px);transition:opacity .7s cubic-bezier(.16,1,.3,1),transform .7s cubic-bezier(.16,1,.3,1)}
.reveal.in{opacity:1;transform:none}
.reveal[data-d="1"]{transition-delay:.07s}.reveal[data-d="2"]{transition-delay:.14s}
.reveal[data-d="3"]{transition-delay:.21s}.reveal[data-d="4"]{transition-delay:.28s}
.reveal[data-d="5"]{transition-delay:.35s}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-10px)}}
.float{animation:float 7s ease-in-out infinite}

/* ---- 404 ---- */
.nf{min-height:64vh;display:grid;place-items:center;text-align:center;padding:80px 0}
.nf .big{font-family:var(--sans);font-weight:700;font-size:120px;color:var(--blue-hi);line-height:1;letter-spacing:.01em}

/* ---- responsive ---- */
@media (max-width:960px){
  .hero-grid,.split{grid-template-columns:1fr;gap:36px}
  .split.rev .split-txt{order:0}
  .term-lay{grid-template-columns:1fr}
  .meta{position:static}
  .bento{grid-template-columns:repeat(2,1fr)}
  .card.wide,.card.mid,.card.feat,.card.third{grid-column:span 2}
  .mods,.posts,.dir-list{grid-template-columns:1fr}
  .logos{grid-template-columns:repeat(2,1fr)}
  .ft-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:640px){
  body{font-size:16px}
  .nav{display:none}.burger{display:block}
  .nav.open{display:flex;position:absolute;top:66px;left:0;right:0;flex-direction:column;gap:0;
    background:#fff;border-bottom:1px solid var(--line-2);padding:8px 24px 16px}
  .nav.open a{padding:11px 0;border-bottom:1px solid var(--line)}
  .hdr-cta .btn-ghost{display:none}
  .hero{padding:64px 0 40px}
  .logos{grid-template-columns:1fr}
  .hero-stat{gap:24px;flex-wrap:wrap}
  .sec{padding:56px 0}
  .posts,.mods{grid-template-columns:1fr}
  .ft-grid{grid-template-columns:1fr 1fr}
  .cta-band{padding:44px 22px}
}
@media (prefers-reduced-motion:reduce){
  .reveal{opacity:1;transform:none;transition:none}
  .float{animation:none}
  html{scroll-behavior:auto}
  *{animation:none!important}
}