/* Quantia landing — sistema visual (oscuro, escala de grises de marca) */
:root{
  --bg:#2a2e34; --bg2:#21242a; --panel:#1a1d22;
  --ink:#eef0f2; --muted:#9aa1a8; --soft:#90969d; --ia:#9aa1a8;
  --line:rgba(238,240,242,0.10); --line2:rgba(238,240,242,0.18);
  --maxw:1240px; --pad:clamp(20px,5vw,80px);
  --mono:'IBM Plex Mono',ui-monospace,Menlo,monospace;
  --sans:'Archivo',system-ui,sans-serif;
}
html[data-theme="light"]{
  --bg:#eef0f2; --bg2:#e4e7ea; --panel:#f5f6f7;
  --ink:#14161a; --muted:#566069; --soft:#5f656c; --ia:#6a7079;
  --line:rgba(20,22,26,0.12); --line2:rgba(20,22,26,0.22);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:var(--bg); color:var(--ink); font-family:var(--sans);
  -webkit-font-smoothing:antialiased; line-height:1.5; overflow-x:hidden;
}
a{color:inherit;text-decoration:none}
::selection{background:var(--ink);color:var(--bg)}
/* brand inline: in body copy, "QUANTIA" gets the logo's typographic split.
   QUANT is forced to --ink (so it shows full contrast even inside muted leads).
   IA picks up the logo's secondary gray. */
.brand-q{color:var(--ink)}
.brand-ia{color:var(--ia)}
/* focus-visible: brand-coherent 2px ring */
:where(a,button):focus-visible{outline:2px solid var(--ink);outline-offset:2px;border-radius:inherit}
.lang button:focus-visible,.lang a:focus-visible{outline:none;box-shadow:inset 0 0 0 2px var(--ink)}
.wrap{max-width:var(--maxw);margin:0 auto;padding-left:var(--pad);padding-right:var(--pad)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
/* Skip-to-content link: visible only on focus. Keyboard users can bypass the nav. */
.skip-link{position:absolute;top:-100px;left:8px;z-index:300;background:var(--ink);color:var(--bg);padding:12px 18px;border-radius:8px;font-family:var(--mono);font-size:13px;font-weight:600;letter-spacing:.02em;transition:top .15s ease-out}
.skip-link:focus{top:8px;outline:2px solid var(--bg);outline-offset:2px}
.mono{font-family:var(--mono);font-weight:400;letter-spacing:.04em}
.eyebrow{font-family:var(--mono);font-size:12px;letter-spacing:.22em;text-transform:uppercase;color:var(--muted)}

/* ---------- NAV ---------- */
.nav{position:fixed;top:0;left:0;right:0;z-index:50;
  backdrop-filter:saturate(140%) blur(14px);background:color-mix(in srgb, var(--bg) 62%, transparent);
  border-bottom:1px solid var(--line)}
.nav-in{display:flex;align-items:center;gap:28px;height:68px}
.nav .logo{height:36px;width:auto;display:block}
.nav-links{display:flex;gap:26px;margin-left:auto;align-items:center}
.nav-links a{font-size:13.5px;color:var(--muted);transition:color .2s,font-weight .2s;position:relative}
.nav-links a:hover{color:var(--ink)}
.nav-links a.current{color:var(--ink);font-weight:600}
.nav-links a.btn{color:var(--bg)}
.nav-links a.btn:hover{color:var(--ink)}
.lang{display:flex;gap:2px;font-family:var(--mono);font-size:12px;border:1px solid var(--line2);border-radius:999px;overflow:hidden}
.lang button,.lang a{background:none;border:none;color:var(--soft);padding:11px 14px;min-height:44px;cursor:pointer;font:inherit;transition:color .2s,background-color .2s;text-decoration:none;display:inline-flex;align-items:center;justify-content:center;line-height:1}
.lang button.on,.lang a.on,.lang button[aria-pressed="true"],.lang a[aria-pressed="true"]{background:var(--ink);color:var(--bg)}
.lang button[disabled]{cursor:default}
.lang a:hover{color:var(--ink)}
.themebtn{background:none;border:1px solid var(--line2);color:var(--ink);width:44px;height:44px;border-radius:999px;cursor:pointer;font-size:16px;line-height:1;display:inline-flex;align-items:center;justify-content:center;transition:border-color .2s}
.themebtn:hover{border-color:var(--ink)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-size:13.5px;font-weight:600;
  padding:12px 22px;min-height:44px;border-radius:999px;border:1px solid var(--ink);background:var(--ink);color:var(--bg);
  cursor:pointer;transition:background-color .2s,color .2s,border-color .2s;white-space:nowrap}
.btn:hover{background:transparent;color:var(--ink)}
.btn.ghost{background:transparent;color:var(--ink);border-color:var(--line2)}
.btn.ghost:hover{border-color:var(--ink)}
.nav-toggle{display:none}

/* ---------- HERO ---------- */
.hero{position:relative;min-height:100svh;display:flex;align-items:flex-end;overflow:hidden}
#hero-canvas{position:absolute;inset:0;width:100%;height:100%;display:block;z-index:0}
.hero::after{content:"";position:absolute;inset:0;z-index:1;pointer-events:none;
  background:radial-gradient(120% 80% at 70% 30%,transparent 40%,color-mix(in srgb,var(--bg) 50%,transparent) 100%),
             linear-gradient(180deg,color-mix(in srgb,var(--bg) 55%,transparent) 0%,transparent 22% 60%,color-mix(in srgb,var(--bg) 92%,transparent) 100%)}
.hero-in{position:relative;z-index:2;width:100%;padding-bottom:clamp(48px,9vh,120px);padding-top:120px}
.hero h1{font-size:clamp(40px,6.4vw,94px);line-height:1.02;letter-spacing:-.025em;font-weight:700;
  max-width:17ch;margin:22px 0 0;text-wrap:balance}
.hero h1 .dim{color:var(--ia)}
.hero .sub{margin-top:26px;max-width:60ch;font-size:clamp(16px,1.5vw,20px);color:var(--ink);text-wrap:pretty}
.hero-cta{display:flex;gap:14px;margin-top:34px;flex-wrap:wrap}
.scroll-hint{position:absolute;bottom:26px;right:var(--pad);z-index:2;display:flex;align-items:center;gap:10px;
  font-family:var(--mono);font-size:11px;letter-spacing:.2em;text-transform:uppercase;color:var(--soft)}
.scroll-hint .bar{width:1px;height:34px;background:linear-gradient(var(--soft),transparent);display:block}

/* ---------- SECTION SCAFFOLD ---------- */
section{position:relative}
.sec{padding:clamp(80px,12vh,160px) 0;border-top:1px solid var(--line)}
.sec h2{font-size:clamp(30px,4.4vw,60px);line-height:1.05;letter-spacing:-.02em;font-weight:700;max-width:48ch;text-wrap:balance;margin:0;flex:1 1 auto;min-width:0}
/* sec-head-row: tag | filete | titular. Replica el orden del logotipo: marca | filete | wordmark.
   Conceptualmente cada sección re-actúa el evento del double-slit: onda (tag) → barrera (filete) → partícula (titular). */
.sec-head-row{display:flex;align-items:center;gap:clamp(18px,2.4vw,32px);margin-bottom:22px}
.sec-tag{font-family:var(--mono);font-size:12px;letter-spacing:.22em;text-transform:uppercase;color:var(--muted);white-space:nowrap;font-weight:500;flex-shrink:0}
/* Doble-rendija (barrera del hero): tres segmentos verticales con dos slits. Proporciones
   derivadas del barrier en hero.js (slitSep + gap), normalizadas para reading editorial. */
.sec-filete{display:block;flex-shrink:0;width:2.5px;height:clamp(36px,4.8vw,64px);background:linear-gradient(to bottom,var(--soft) 0% 40%,transparent 40% 45%,var(--soft) 45% 55%,transparent 55% 60%,var(--soft) 60% 100%);opacity:.6}
.sec-head-row--center{justify-content:center;text-align:left}
.sec .lead{font-size:clamp(17px,1.7vw,21px);color:var(--muted);max-width:75ch;margin:22px auto 0}

/* what — pillars */
.pillars{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);margin-top:64px;border:1px solid var(--line);border-radius:14px;overflow:hidden}
.pillar{background:var(--bg);padding:34px 30px;min-height:220px;display:flex;flex-direction:column}
.pillar .pn{font-family:var(--mono);font-size:12px;color:var(--soft)}
.pillar h3{font-size:22px;font-weight:600;margin:14px 0 10px}
.pillar p{color:var(--muted);font-size:15px}

/* tech */
.tech-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:56px}
.tech-card{border-top:1px solid var(--line2);padding-top:18px}
.tech-card h3{font-size:18px;font-weight:600;margin-bottom:8px}
.tech-card p{color:var(--muted);font-size:14px}

/* cases */
.cases{margin-top:36px;border-top:1px solid var(--line)}
.case-row{padding:30px 0;border-bottom:1px solid var(--line);cursor:default}
.case-row-inner{display:grid;grid-template-columns:60px 1fr 1.3fr;gap:24px;align-items:center;transition:transform .3s cubic-bezier(.2,.7,.2,1);will-change:transform}
.case-row:hover .case-row-inner{transform:translateX(14px)}
.case-row .ci{display:inline-flex;align-items:center;color:var(--soft)}
.case-row .ci .qmark{width:44px;height:44px;display:block}
.case-row h3{font-size:17.5px;font-weight:600;letter-spacing:-.01em}
.case-row p{color:var(--muted);font-size:15.5px}

/* pricing */
#pricing,#research{min-height:100vh;min-height:100dvh;display:flex;flex-direction:column;justify-content:center}
.tiers{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:56px}
.tier{border:1px solid var(--line);border-radius:16px;padding:30px;display:flex;flex-direction:column;background:var(--bg2)}
.tier .tname{font-size:19px;font-weight:600}
.tier .tdesc{color:var(--muted);font-size:14.5px;margin:14px 0 20px}
.tier ul{list-style:none;display:flex;flex-direction:column;gap:10px;margin-bottom:26px}
.tier li{font-size:14px;color:var(--ink);display:flex;gap:10px;align-items:flex-start}
.tier li::before{content:"";flex:0 0 auto;width:9px;height:9px;margin-top:5px;background:var(--ia);
  -webkit-mask:repeating-linear-gradient(90deg,#000 0 1.4px,transparent 1.4px 3px);mask:repeating-linear-gradient(90deg,#000 0 1.4px,transparent 1.4px 3px)}
.tier .btn{margin-top:auto;justify-content:center}
.tiers-note{text-align:center;font-size:13px;color:var(--muted);margin:30px auto 0;font-family:var(--mono);letter-spacing:.02em;max-width:60ch;line-height:1.55}

/* trust section: sober client name strip between cases and pricing */
.trust{padding:clamp(50px,7vh,90px) 0;border-top:1px solid var(--line)}
.trust-wrap{display:flex;flex-direction:column;align-items:center;text-align:center;gap:26px}
.trust-eyebrow{font-family:var(--mono);font-size:12px;letter-spacing:.22em;text-transform:uppercase;color:var(--muted);font-weight:500}
.trust-list{display:flex;flex-wrap:wrap;justify-content:center;align-items:center;gap:14px 28px;max-width:95ch}
.trust-item{font-size:clamp(15px,1.4vw,17px);font-weight:500;color:var(--ink);letter-spacing:-.005em;position:relative;line-height:1.4}
.trust-item:not(:last-child)::after{content:"";position:absolute;right:-18px;top:50%;width:4px;height:4px;border-radius:50%;background:var(--soft);transform:translateY(-50%);opacity:.7}
/* When only 1 client, bump weight + size so it doesn't read as "we have nothing". Auto-scales back when more clients are added. */
.trust-item:only-child{font-size:clamp(20px,2vw,26px);font-weight:600;letter-spacing:-.01em}

/* research */
.posts{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:56px}
.post{border:1px solid var(--line);border-radius:14px;padding:26px;background:var(--bg2);transition:.25s;min-height:230px;display:flex;flex-direction:column}
.post:hover{border-color:var(--line2);transform:translateY(-3px)}
.post .ptag{font-family:var(--mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--soft)}
.post h3{font-size:20px;font-weight:600;margin:14px 0 12px;letter-spacing:-.01em}
.post p{color:var(--muted);font-size:14.5px}
.post .arrow{margin-top:auto;font-family:var(--mono);font-size:13px;color:var(--muted)}

/* contact */
.contact-wrap{display:flex;flex-direction:column;align-items:center}
.contact-intro{text-align:center;max-width:62ch}
.contact-intro .lead{margin-top:18px;max-width:none}
form.cf{margin-top:56px;width:100%;max-width:560px;display:flex;flex-direction:column;gap:18px}
.cf-field{display:flex;flex-direction:column;gap:8px}
.cf-label{font-family:var(--mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--muted)}
.cf input,.cf textarea{background:var(--bg2);border:1px solid var(--line);border-radius:10px;padding:14px 16px;color:var(--ink);font:inherit;font-size:15px;transition:border-color .2s;width:100%}
.cf input:focus-visible,.cf textarea:focus-visible{outline:none;border-color:var(--ink)}
.cf textarea{min-height:120px;resize:vertical}
.cf .row2{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.cf .btn{align-self:flex-start;margin-top:6px}
.cf .btn:disabled{opacity:.5;cursor:not-allowed}
.cf-status{min-height:1.4em;font-size:14px;color:var(--muted);margin:0}
.cf-status[data-state="error"]{color:var(--ink)}
.cf-status[data-state="ok"]{color:var(--muted)}
.mailrow{margin-top:24px;font-family:var(--mono);font-size:14px;color:var(--muted);text-align:center}
.mailrow a{color:var(--ink);border-bottom:1px solid var(--line2);padding-bottom:2px;margin-left:6px}
.mailrow a:hover{border-bottom-color:var(--ink)}

/* footer */
.footer{border-top:1px solid var(--line);padding:56px 0 40px}
.footer-in{display:flex;justify-content:space-between;gap:30px;flex-wrap:wrap;align-items:flex-start}
.footer .logo{height:clamp(56px,9vw,112px);margin-bottom:32px;display:block;max-width:100%}
.footer .tagline{color:var(--muted);font-size:14px;max-width:32ch}
.footer .fcol h4{font-family:var(--mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--soft);margin-bottom:12px}
.footer .fcol a{display:block;color:var(--muted);font-size:14px;padding:4px 0;transition:.2s}
.footer .fcol a:hover{color:var(--ink)}
.footer-cols{display:flex;gap:60px;flex-wrap:wrap}
.copyline{display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;margin-top:46px;padding-top:22px;border-top:1px solid var(--line);font-family:var(--mono);font-size:11.5px;color:var(--soft);letter-spacing:.04em}

/* reveal — default visible; JS adds .staged before observer reveals.
   Headless renders, social scrapers, and disabled-JS users see content immediately. */
.reveal{transition:opacity .7s cubic-bezier(.2,.7,.2,1),transform .7s cubic-bezier(.2,.7,.2,1)}
.reveal.staged{opacity:0;transform:translateY(22px)}
@media(prefers-reduced-motion:reduce){.reveal.staged{opacity:1;transform:none;transition:none}}

/* draft post card (unpublished) */
.post-draft{opacity:.55;cursor:default;transform:none !important}
.post-draft .ptag-draft{color:var(--soft)}
.post-draft:hover{transform:none;border-color:var(--line)}
.research-cta-row{display:flex;justify-content:center;margin-top:42px}

/* ============ READING PROGRESS BAR (post pages) ============ */
.reading-progress{position:fixed;top:0;left:0;height:2px;width:0;background:var(--ink);z-index:200;transition:width .08s ease-out;pointer-events:none}

/* ============ POST PAGE ============ */
.post-main{padding:80px 0 100px}
.post-article{max-width:720px;margin:0 auto;padding:0 var(--pad)}
.post-back{display:inline-block;font-family:var(--mono);font-size:13px;color:var(--muted);margin-bottom:48px;transition:color .2s;letter-spacing:.02em}
.post-back:hover{color:var(--ink)}
.post-header{margin-bottom:36px}
.post-tag{display:inline-block;font-family:var(--mono);font-size:12px;letter-spacing:.22em;text-transform:uppercase;color:var(--muted);margin-bottom:22px;font-weight:500}
.post-title{font-size:clamp(28px,4.4vw,52px);line-height:1.1;letter-spacing:-.02em;font-weight:700;margin:0 0 26px;text-wrap:balance;overflow-wrap:anywhere}
.post-meta{font-family:var(--mono);font-size:13px;color:var(--muted);margin:0;display:flex;flex-wrap:wrap;gap:8px;align-items:center;letter-spacing:.02em}
.post-meta .dot{color:var(--soft)}
.post-meta time{font-family:inherit}
.post-filete{width:100%;height:2.5px;background:linear-gradient(to right,var(--soft) 0% 40%,transparent 40% 45%,var(--soft) 45% 55%,transparent 55% 60%,var(--soft) 60% 100%);opacity:.6;margin:40px 0}

/* prose: long-form article body */
.prose{font-size:18px;line-height:1.75;color:var(--ink)}
.prose p{margin:0 0 1.4em}
.prose p:last-child{margin-bottom:0}
.prose > p:first-of-type::first-letter{float:left;font-size:5em;line-height:.85;margin:.05em .12em 0 -.04em;font-weight:700;color:var(--ink)}
.prose h2{font-size:clamp(24px,2.8vw,32px);font-weight:700;line-height:1.2;letter-spacing:-.015em;margin:2.2em 0 .8em;text-wrap:balance}
.prose h3{font-size:clamp(20px,2.2vw,24px);font-weight:600;line-height:1.25;margin:1.8em 0 .6em}
.prose ul,.prose ol{margin:0 0 1.4em;padding-left:1.4em}
.prose li{margin-bottom:.5em}
.prose blockquote{margin:1.6em 0;padding-left:24px;border-left:2px solid var(--line2);font-style:italic;color:var(--muted)}
.prose a{color:var(--ink);border-bottom:1px solid var(--line2);transition:border-color .2s}
.prose a:hover{border-bottom-color:var(--ink)}
.prose strong{font-weight:600}
.prose em{font-style:italic}
.prose code{font-family:var(--mono);font-size:.92em;background:var(--bg2);padding:2px 6px;border-radius:4px}

.post-end{display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap;margin-top:8px}
.post-back-cta{font-family:var(--mono);font-size:13px;color:var(--muted);transition:color .2s;letter-spacing:.02em}
.post-back-cta:hover{color:var(--ink)}

/* ============ RESEARCH INDEX PAGE ============ */
.research-main{padding:80px 0 100px}
.research-wrap{max-width:980px;margin:0 auto;padding:0 var(--pad)}
.research-intro{margin-bottom:64px}
.research-intro h1{font-size:clamp(36px,5vw,60px);line-height:1.05;letter-spacing:-.02em;font-weight:700;margin:0 0 22px;text-wrap:balance}
.research-intro .lead{font-size:clamp(17px,1.7vw,21px);color:var(--muted);max-width:60ch;margin:0}
.research-list{display:flex;flex-direction:column;gap:0}
.research-list .post-row{display:grid;grid-template-columns:140px 1fr auto;gap:32px;align-items:start;padding:28px 0;border-top:1px solid var(--line);transition:transform .2s ease-out;text-decoration:none}
.research-list .post-row:last-child{border-bottom:1px solid var(--line)}
.research-list .post-row:hover{transform:translateX(8px)}
.research-list .post-row-date{font-family:var(--mono);font-size:13px;color:var(--soft);letter-spacing:.04em;padding-top:4px}
.research-list .post-row-tag{font-family:var(--mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--muted);margin-bottom:8px;font-weight:500}
.research-list .post-row-body h2{font-size:22px;font-weight:600;letter-spacing:-.01em;line-height:1.25;margin:0 0 8px;color:var(--ink)}
.research-list .post-row-body p{font-size:15px;color:var(--muted);margin:0;max-width:65ch}
.research-list .post-row-arrow{font-family:var(--mono);font-size:18px;color:var(--soft);padding-top:4px;transition:color .2s,transform .2s}
.research-list .post-row:hover .post-row-arrow{color:var(--ink);transform:translateX(4px)}
.research-list .post-row.draft{opacity:.5;cursor:default;pointer-events:none}

/* responsive */
@media(max-width:980px){
  .tech-grid,.posts,.tiers,.pillars{grid-template-columns:1fr 1fr}
  .case-row-inner{grid-template-columns:56px 1fr;gap:14px}
  .case-row-inner p{grid-column:2}
  form.cf{margin-top:40px}
  .research-list .post-row{grid-template-columns:1fr auto;gap:16px}
  .research-list .post-row-date{order:2;grid-column:1/-1;padding-top:0;margin-top:8px}
}
@media(max-width:680px){
  .nav-links{display:none}
  .nav-links.open{display:flex;position:fixed;top:68px;left:0;right:0;flex-direction:column;gap:0;
    background:var(--bg2);border-bottom:1px solid var(--line);padding:8px var(--pad) 18px}
  .nav-links.open a{padding:14px 0;border-bottom:1px solid var(--line);width:100%}
  .nav-links.open .lang,.nav-links.open .btn{margin-top:12px}
  .nav-toggle{display:inline-flex;margin-left:auto;background:none;border:1px solid var(--line2);border-radius:8px;color:var(--ink);width:44px;height:44px;align-items:center;justify-content:center;cursor:pointer;font-size:18px}
  .tech-grid,.posts,.tiers,.pillars{grid-template-columns:1fr}
  .hero h1{font-size:clamp(34px,9vw,52px)}
  .scroll-hint{display:none}
  .cf .row2{grid-template-columns:1fr}
  form.cf{margin-top:32px}
  /* sec-head-row collapses: tag arriba, filete horizontal (la barrera ahora cruza el flujo vertical), h2 abajo */
  .sec-head-row{flex-direction:column;align-items:flex-start;gap:12px}
  .sec-head-row--center{align-items:center}
  .sec-filete{width:48px;height:2.5px;background:linear-gradient(to right,var(--soft) 0% 40%,transparent 40% 45%,var(--soft) 45% 55%,transparent 55% 60%,var(--soft) 60% 100%)}
  .post-main{padding:60px 0 80px}
  .post-back{margin-bottom:32px}
  .post-title{font-size:32px}
  .prose{font-size:17px}
  .prose > p:first-of-type::first-letter{font-size:4.2em}
  .post-end{flex-direction:column;align-items:stretch}
  .post-end .btn{justify-content:center}
}