/* ============================================================
   INTEPRIT — Enterprise design system
   Black & white + International Klein Blue accent
   ============================================================ */

:root{
  --ink:#0B0B0C;          /* near-black text */
  --ink-2:#3A3A40;        /* secondary text */
  --ink-3:#6E6E77;        /* tertiary / captions */
  --line:#E4E4E7;         /* hairlines */
  --line-2:#D0D0D5;       /* stronger rules */
  --paper:#FCFCFB;        /* page background */
  --paper-2:#F5F5F3;      /* alt sections */
  --card:#FFFFFF;
  --klein:#2323E6;        /* the one accent — International Klein Blue, tuned */
  --klein-ink:#1A1AC4;    /* accent text on light (AA) */
  --klein-wash:#EEEEFF;   /* accent tint surface */
  --dark:#0B0B14;         /* dark panels */
  --dark-2:#14141F;

  --r:14px;               /* radius */
  --r-lg:22px;
  --shadow:0 1px 2px rgba(11,11,12,.04), 0 8px 30px rgba(11,11,12,.06);
  --shadow-lg:0 2px 4px rgba(11,11,12,.05), 0 24px 60px rgba(11,11,20,.12);

  --wrap:1200px;
  --pad:clamp(20px,5vw,64px);

  --f-display:'Bricolage Grotesque',system-ui,sans-serif;
  --f-body:'Inter',system-ui,sans-serif;
  --f-mono:'DM Mono',ui-monospace,monospace;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--f-body);
  color:var(--ink);
  background:var(--paper);
  font-size:17px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

.wrap{max-width:var(--wrap);margin:0 auto;padding-inline:var(--pad)}
main{display:block}
img{max-width:100%;display:block}
a{color:inherit}

/* ---------- Type ---------- */
h1,h2,h3,h4{font-family:var(--f-display);font-weight:800;letter-spacing:-.03em;line-height:1.04}
.display{font-size:clamp(2.6rem,6vw,4.6rem);letter-spacing:-.045em;line-height:.98}
h1{font-size:clamp(2.2rem,5vw,3.7rem)}
h2{font-size:clamp(1.7rem,3.4vw,2.7rem)}
h3{font-size:clamp(1.15rem,1.7vw,1.4rem);letter-spacing:-.02em}
.eyebrow{font-family:var(--f-mono);font-size:.72rem;font-weight:500;letter-spacing:.14em;text-transform:uppercase;color:var(--klein-ink)}
.lede{font-size:clamp(1.15rem,1.8vw,1.42rem);line-height:1.5;color:var(--ink-2);font-weight:400;letter-spacing:-.01em}
.accent{color:var(--klein-ink)}
.muted{color:var(--ink-3)}
p{max-width:66ch}
strong{font-weight:600;color:var(--ink)}

/* accent underline device — used on ONE phrase per heading */
.mark{background:linear-gradient(transparent 62%,var(--klein-wash) 62%);padding:0 .04em}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:.55em;font-family:var(--f-body);font-weight:600;
  font-size:.98rem;letter-spacing:-.01em;padding:.82em 1.4em;border-radius:100px;
  text-decoration:none;cursor:pointer;border:1.5px solid transparent;transition:.22s cubic-bezier(.2,.7,.3,1);white-space:nowrap}
.btn-primary{background:var(--klein);color:#fff}
.btn-primary:hover{background:var(--klein-ink);transform:translateY(-1px);box-shadow:0 10px 24px rgba(35,35,230,.28)}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--line-2)}
.btn-ghost:hover{border-color:var(--ink);transform:translateY(-1px)}
.btn-dark{background:var(--ink);color:#fff}
.btn-dark:hover{background:#000;transform:translateY(-1px)}
.btn .arr{transition:transform .22s}
.btn:hover .arr{transform:translateX(3px)}

.link-arr{display:inline-flex;align-items:center;gap:.4em;font-weight:600;color:var(--klein-ink);
  text-decoration:none;font-size:1rem}
.link-arr .arr{transition:transform .2s}
.link-arr:hover .arr{transform:translateX(4px)}

/* ---------- Nav ---------- */
.nav{position:sticky;top:0;z-index:100;background:rgba(252,252,251,.82);backdrop-filter:saturate(1.4) blur(14px);
  border-bottom:1px solid var(--line)}
.nav-in{max-width:var(--wrap);margin:0 auto;padding:.85rem var(--pad);display:flex;align-items:center;gap:1.5rem}
.brand{font-family:var(--f-display);font-weight:800;font-size:1.28rem;letter-spacing:-.04em;text-decoration:none;color:var(--ink)}
.brand .dot{color:var(--klein)}
.nav-links{display:flex;gap:.3rem;margin-left:1rem}
.nav-links a{font-size:.94rem;font-weight:500;color:var(--ink-2);text-decoration:none;padding:.5rem .7rem;border-radius:8px;transition:.15s;letter-spacing:-.01em}
.nav-links a:hover{color:var(--ink);background:var(--paper-2)}
.nav-links a[aria-current]{color:var(--klein-ink)}
.nav-cta{margin-left:auto;display:flex;gap:.6rem;align-items:center}
.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:.4rem;flex-direction:column;gap:5px}
.nav-toggle span{width:22px;height:2px;background:var(--ink);border-radius:2px;transition:.2s}
.mobile-menu{display:none}
@media(max-width:940px){
  .nav-links,.nav-cta .btn{display:none}
  .nav-toggle{display:flex}
  .mobile-menu{display:none;flex-direction:column;padding:.5rem var(--pad) 1.2rem;border-bottom:1px solid var(--line);background:var(--paper)}
  .mobile-menu.open{display:flex}
  .mobile-menu a{padding:.7rem 0;text-decoration:none;color:var(--ink);font-weight:500;border-bottom:1px solid var(--line)}
  .mobile-menu .btn{margin-top:.8rem}
}

/* ---------- Sections ---------- */
.section{padding:clamp(56px,8vw,110px) 0}
.section-sm{padding:clamp(40px,5vw,72px) 0}
.alt{background:var(--paper-2)}
.dark{background:var(--dark);color:#fff}
.dark h1,.dark h2,.dark h3{color:#fff}
.dark .lede,.dark p{color:rgba(255,255,255,.72)}
.dark .eyebrow{color:#9a9aff}
.center{text-align:center}
.center p{margin-inline:auto}

/* ---------- Hero ---------- */
.hero{padding:clamp(48px,7vw,96px) 0 clamp(40px,6vw,80px)}
.hero-grid{display:grid;grid-template-columns:1.08fr .92fr;gap:clamp(2rem,5vw,4.5rem);align-items:center}
.hero h1{margin:1.1rem 0 1.3rem}
.hero .lede{margin-bottom:2rem;max-width:34ch}
.hero-cta{display:flex;gap:.8rem;flex-wrap:wrap}
@media(max-width:900px){.hero-grid{grid-template-columns:1fr;gap:2.5rem}}

/* ---------- Signature: drift demo ---------- */
.drift{background:var(--dark);border-radius:var(--r-lg);padding:clamp(1.4rem,2.5vw,2.2rem);box-shadow:var(--shadow-lg);
  font-family:var(--f-mono);position:relative;overflow:hidden}
.drift::before{content:"";position:absolute;inset:0;background:radial-gradient(120% 80% at 100% 0,rgba(35,35,230,.18),transparent 55%);pointer-events:none}
.drift-row{display:flex;justify-content:space-between;align-items:center;position:relative}
.drift-tag{font-size:.66rem;letter-spacing:.1em;text-transform:uppercase;color:rgba(255,255,255,.4)}
.drift-live{display:inline-flex;align-items:center;gap:.4em;font-size:.66rem;letter-spacing:.08em;text-transform:uppercase;color:#9a9aff}
.drift-live::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--klein);box-shadow:0 0 0 0 rgba(35,35,230,.6);animation:pulse 2s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(35,35,230,.5)}70%{box-shadow:0 0 0 7px rgba(35,35,230,0)}100%{box-shadow:0 0 0 0 rgba(35,35,230,0)}}
.drift hr{border:none;border-top:1px solid rgba(255,255,255,.1);margin:1.2rem 0}
.drift-k{font-size:.66rem;letter-spacing:.05em;color:rgba(255,255,255,.4);display:block;margin-bottom:.5rem}
.drift-v{font-size:clamp(1.3rem,2.4vw,1.7rem);color:#fff;font-weight:500}
.drift-step{opacity:0;transform:translateY(6px);animation:rise .55s cubic-bezier(.2,.7,.3,1) forwards}
.drift-step.s1{animation-delay:.5s}
.drift-step.s2{animation-delay:1.05s}
.drift-note{color:#9a9aff;font-size:.82rem;margin-top:.7rem;line-height:1.6}
@keyframes rise{to{opacity:1;transform:none}}

/* ---------- Stat strip ---------- */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border-block:1px solid var(--line)}
.stat{background:var(--paper);padding:clamp(1.4rem,3vw,2.2rem) var(--pad)}
.stat .n{font-family:var(--f-display);font-weight:800;font-size:clamp(2rem,3.6vw,3rem);letter-spacing:-.04em;line-height:1}
.stat .l{font-family:var(--f-mono);font-size:.72rem;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-3);margin-top:.5rem}
@media(max-width:720px){.stats{grid-template-columns:repeat(2,1fr)}}

/* ---------- AI/Human routing band ---------- */
.route{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem;margin-top:2.5rem}
.route-card{border:1px solid var(--line);border-radius:var(--r);padding:1.8rem;background:var(--card);transition:.22s}
.route-card:hover{border-color:var(--line-2);box-shadow:var(--shadow)}
.route-card h3{margin-bottom:.6rem}
.route-badge{font-family:var(--f-mono);font-size:.68rem;letter-spacing:.08em;text-transform:uppercase;
  display:inline-block;padding:.3em .7em;border-radius:100px;margin-bottom:1rem}
.route-badge.ai{background:var(--klein-wash);color:var(--klein-ink)}
.route-badge.human{background:var(--ink);color:#fff}
@media(max-width:720px){.route{grid-template-columns:1fr}}

/* ---------- Feature rows ---------- */
.feat{display:grid;grid-template-columns:1fr 1fr;gap:clamp(2rem,5vw,4rem);align-items:start}
.feat.flip>*:first-child{order:2}
@media(max-width:820px){.feat{grid-template-columns:1fr;gap:1.5rem}.feat.flip>*:first-child{order:0}}
.pillars{display:grid;gap:0;margin-top:1.5rem}
.pillar{padding:1.6rem 0;border-top:1px solid var(--line);display:grid;grid-template-columns:auto 1fr;gap:1.2rem;align-items:baseline}
.pillar:last-child{border-bottom:1px solid var(--line)}
.pillar .pk{font-family:var(--f-mono);font-size:.8rem;color:var(--klein-ink);font-weight:500}
.pillar h3{margin-bottom:.35rem;font-size:1.1rem}
.pillar p{color:var(--ink-2);font-size:.98rem}

/* ---------- Cards / grids ---------- */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:1.2rem}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:1.2rem}
@media(max-width:820px){.grid-3{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.grid-3,.grid-2{grid-template-columns:1fr}}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:1.6rem;transition:.22s;text-decoration:none;color:inherit;display:block}
.card:hover{border-color:var(--klein);box-shadow:var(--shadow);transform:translateY(-2px)}
.card h3{margin-bottom:.5rem}
.card p{font-size:.94rem;color:var(--ink-2)}

/* industries grid */
.ind-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--r);overflow:hidden;margin-top:2rem}
.ind-cell{background:var(--card);padding:1.4rem 1.5rem;text-decoration:none;color:inherit;display:flex;align-items:center;justify-content:space-between;gap:1rem;transition:.18s;position:relative}
.ind-cell:hover{background:var(--klein);color:#fff}
.ind-name{font-family:var(--f-display);font-weight:700;font-size:1.02rem;letter-spacing:-.02em}
.ind-cell .arr{font-family:var(--f-mono);opacity:.4;transition:.18s}
.ind-cell:hover .arr{opacity:1;transform:translateX(3px)}
@media(max-width:820px){.ind-grid{grid-template-columns:1fr 1fr}}
@media(max-width:520px){.ind-grid{grid-template-columns:1fr}}

/* ---------- Case blocks ---------- */
.case{padding:clamp(2rem,4vw,3rem) 0;border-top:1px solid var(--line)}
.case-meta{font-family:var(--f-mono);font-size:.72rem;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-3);
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:.5rem;margin-bottom:1.2rem}
.case h3{font-size:clamp(1.3rem,2.2vw,1.7rem);margin-bottom:1rem;letter-spacing:-.03em}

/* ---------- Routing table (definition rows) ---------- */
.rows{border-top:1px solid var(--line);margin-top:1.5rem}
.rrow{display:grid;grid-template-columns:230px 1fr;gap:2rem;padding:1.15rem 0;border-bottom:1px solid var(--line)}
.rrow dt{font-family:var(--f-mono);font-size:.86rem;color:var(--ink);font-weight:500}
.rrow dd{color:var(--ink-2);font-size:.96rem}
@media(max-width:680px){.rrow{grid-template-columns:1fr;gap:.3rem}}

/* ---------- Insight list ---------- */
.post{display:block;text-decoration:none;color:inherit;padding:1.5rem 0;border-top:1px solid var(--line);transition:.18s}
.post:hover{padding-left:.5rem}
.post-k{font-family:var(--f-mono);font-size:.7rem;letter-spacing:.06em;text-transform:uppercase;color:var(--ink-3);margin-bottom:.5rem}
.post h3{font-size:1.24rem;letter-spacing:-.025em;transition:color .18s}
.post:hover h3{color:var(--klein-ink)}
.post p{color:var(--ink-2);font-size:.96rem;margin-top:.4rem}

/* ---------- CTA band ---------- */
.cta-band{background:var(--dark);color:#fff;border-radius:var(--r-lg);padding:clamp(2.4rem,5vw,4rem);text-align:center;position:relative;overflow:hidden}
.cta-band::before{content:"";position:absolute;inset:0;background:radial-gradient(80% 120% at 50% 0,rgba(35,35,230,.22),transparent 60%)}
.cta-band>*{position:relative}
.cta-band h2{color:#fff;margin-bottom:1rem}
.cta-band p{color:rgba(255,255,255,.72);margin:0 auto 1.8rem;max-width:52ch}

/* ---------- Footer ---------- */
.foot{border-top:1px solid var(--line);padding:clamp(2.5rem,5vw,4rem) 0 2rem}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:2rem}
.foot-brand{font-family:var(--f-display);font-weight:800;font-size:1.3rem;letter-spacing:-.04em}
.foot-brand .dot{color:var(--klein)}
.foot p{color:var(--ink-2);font-size:.94rem;margin:.7rem 0 1rem;max-width:38ch}
.foot-col h4{font-family:var(--f-mono);font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-3);font-weight:500;margin-bottom:.9rem}
.foot-col a{display:block;text-decoration:none;color:var(--ink-2);font-size:.94rem;padding:.28rem 0;transition:.15s}
.foot-col a:hover{color:var(--klein-ink)}
.foot-base{display:flex;justify-content:space-between;flex-wrap:wrap;gap:1rem;margin-top:2.5rem;padding-top:1.5rem;border-top:1px solid var(--line);
  font-family:var(--f-mono);font-size:.72rem;letter-spacing:.04em;color:var(--ink-3)}
@media(max-width:760px){.foot-grid{grid-template-columns:1fr 1fr}.foot-brand-col{grid-column:1/-1}}

/* utilities */
.mt-1{margin-top:1rem}.mt-2{margin-top:2rem}.mt-3{margin-top:3rem}
.mb-1{margin-bottom:1rem}
.maxw{max-width:760px}
.maxw-sm{max-width:620px}

/* ---- SVG wordmark logo ---- */
.brand{display:inline-flex;align-items:center;line-height:0}
.brand-logo{height:22px;width:auto;display:block;color:var(--ink)}
.brand-fallback{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.foot-brand{display:inline-flex;align-items:center;line-height:0}
.foot-brand .brand-logo{height:26px}
@media(max-width:940px){.brand-logo{height:20px}}

:focus-visible{outline:2.5px solid var(--klein);outline-offset:3px;border-radius:3px}

/* ---------- Article ---------- */
.article{padding:clamp(40px,6vw,80px) 0}
.article-head{max-width:760px;margin:0 auto}
.article-back{font-family:var(--f-mono);font-size:.78rem;letter-spacing:.04em;color:var(--ink-3);text-decoration:none;display:inline-flex;gap:.4em;align-items:center;margin-bottom:1.6rem}
.article-back:hover{color:var(--klein-ink)}
.article-k{font-family:var(--f-mono);font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;color:var(--klein-ink);margin-bottom:1rem}
.article h1{font-size:clamp(1.9rem,3.6vw,2.9rem);margin-bottom:1.1rem}
.article-deck{font-size:clamp(1.1rem,1.7vw,1.35rem);line-height:1.5;color:var(--ink-2);max-width:640px}
.article-body{max-width:680px;margin:2.5rem auto 0}
.article-body p{margin-bottom:1.3rem;color:var(--ink);max-width:none}
.article-body h2{font-size:1.5rem;margin:2.4rem 0 1rem;letter-spacing:-.025em}
.article-body ul,.article-body ol{margin:0 0 1.3rem 1.2rem}
.article-body li{margin-bottom:.5rem;color:var(--ink)}
.article-body blockquote{border-left:2.5px solid var(--klein);padding-left:1.4rem;margin:1.8rem 0;font-size:1.1rem;color:var(--ink-2)}
.article-body strong{color:var(--ink)}