/* =========================================================
   Nerbioi Valves — sistema base
   Display: Archivo (variable, eje wdth) · Texto: IBM Plex Sans
   Datos y designaciones: IBM Plex Mono
   ========================================================= */

:root{
  /* Acero y carbón, no crema */
  --ink:      #080B0F;
  --ink-2:    #0E141B;
  --ink-3:    #161F29;
  --ink-line: #243039;
  --steel:    #6C7C8B;
  --steel-lt: #98A8B6;
  --mist:     #C4D0DA;
  --paper:    #EEF2F6;
  --paper-2:  #DFE5EB;

  /* Acento: naranja de horno / señalización industrial */
  --blue:    #3E8FD4;
  --blue-dk: #2A6DA8;
  --note:    #8A9AAA;

  --ok:       #3F8F6B;

  --ff-display: 'Archivo', 'Arial Narrow', system-ui, sans-serif;
  --ff-body:    'IBM Plex Sans', system-ui, -apple-system, sans-serif;
  --ff-mono:    'IBM Plex Mono', ui-monospace, 'SFMono-Regular', monospace;

  --nav-h: 68px;
  --gut: clamp(20px, 4vw, 64px);
  --maxw: 1440px;

  --ease: cubic-bezier(.22,.61,.36,1);
}

*,*::before,*::after{ box-sizing:border-box; }

html{ scroll-behavior:smooth; -webkit-text-size-adjust:100%; }
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  *,*::before,*::after{ animation-duration:.001ms !important; animation-iteration-count:1 !important; transition-duration:.001ms !important; }
}

body{
  margin:0;
  background:var(--ink);
  color:var(--mist);
  font-family:var(--ff-body);
  font-size:16px;
  line-height:1.6;
  font-feature-settings:"ss01","cv05";
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

img,svg,canvas{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
button{ font:inherit; color:inherit; }

::selection{ background:var(--blue); color:#fff; }

:focus-visible{
  outline:2px solid var(--blue);
  outline-offset:3px;
  border-radius:1px;
}

/* ---------- Retícula ---------- */
.wrap{ width:100%; max-width:var(--maxw); margin-inline:auto; padding-inline:var(--gut); }
.grid{ display:grid; grid-template-columns:repeat(12,1fr); gap:clamp(16px,2vw,28px); }

.section{ padding-block:clamp(72px,9vw,140px); position:relative; }
.section--light{ background:var(--paper); color:var(--ink-2); }
.section--mid{ background:var(--ink-2); }

/* ---------- Tipografía ---------- */
.display{
  font-family:var(--ff-display);
  font-weight:800;
  font-stretch:118%;
  font-variation-settings:'wdth' 118,'wght' 800;
  text-transform:uppercase;
  line-height:.92;
  letter-spacing:-.015em;
  margin:0;
  color:var(--paper);
}
.section--light .display{ color:var(--ink); }

.d1{ font-size:clamp(2.6rem, 7.2vw, 6.4rem); }
.d2{ font-size:clamp(2rem, 4.6vw, 3.9rem); }
.d3{ font-size:clamp(1.5rem, 2.6vw, 2.2rem); }
.d4{ font-size:clamp(1.15rem,1.7vw,1.45rem); font-variation-settings:'wdth' 108,'wght' 700; }

.lede{ font-size:clamp(1.05rem,1.35vw,1.28rem); line-height:1.55; color:var(--steel-lt); max-width:62ch; }
.section--light .lede{ color:#3E484D; }

p{ margin:0 0 1em; }
.prose{ max-width:66ch; }
.prose p{ color:var(--steel-lt); }
.section--light .prose p{ color:#3E484D; }

/* Etiqueta técnica: pequeña, mono, con guion inicial como en una lista de despiece */
.tag{
  font-family:var(--ff-mono);
  font-size:.7rem;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--blue);
  display:inline-flex;
  align-items:center;
  gap:.6em;
  margin:0 0 1.1rem;
  font-weight:500;
}
.tag::before{
  content:"";
  width:22px; height:1px;
  background:var(--blue);
  flex:none;
}

.mono{ font-family:var(--ff-mono); font-variant-numeric:tabular-nums; }

/* ---------- Cota: el separador de este sitio ----------
   Una línea acotada con ticks, como en un plano. */
.cota{
  display:flex;
  align-items:center;
  gap:14px;
  font-family:var(--ff-mono);
  font-size:.68rem;
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--steel);
  margin:0;
  width:100%;
}
.cota::before,.cota::after{
  content:"";
  height:9px;
  border-left:1px solid currentColor;
  border-right:1px solid currentColor;
  flex:1;
  position:relative;
  background:linear-gradient(currentColor,currentColor) center/100% 1px no-repeat;
  opacity:.55;
}
.cota--start::before{ flex:0 0 26px; }

/* ---------- Botones ---------- */
.btn{
  --bg:var(--blue); --fg:#fff; --bd:var(--blue);
  display:inline-flex; align-items:center; gap:.7em;
  padding:.92em 1.5em;
  background:var(--bg); color:var(--fg);
  border:1px solid var(--bd);
  font-family:var(--ff-mono);
  font-size:.78rem; font-weight:500;
  letter-spacing:.1em; text-transform:uppercase;
  cursor:pointer;
  transition:background .25s var(--ease), color .25s var(--ease), border-color .25s var(--ease), transform .25s var(--ease);
  position:relative;
}
.btn:hover{ background:var(--blue-dk); border-color:var(--blue-dk); transform:translateY(-1px); }
.btn .arw{ transition:transform .25s var(--ease); }
.btn:hover .arw{ transform:translateX(4px); }

.btn--ghost{ --bg:transparent; --fg:var(--paper); --bd:var(--ink-line); }
.btn--ghost:hover{ background:transparent; border-color:var(--blue); color:var(--blue); }
.section--light .btn--ghost{ --fg:var(--ink); --bd:#C3CACB; }

/* ---------- Navegación ---------- */
.nav{
  position:fixed; inset:0 0 auto 0; z-index:80;
  height:var(--nav-h);
  display:flex; align-items:center;
  background:rgba(11,13,14,0);
  border-bottom:1px solid transparent;
  transition:background .35s var(--ease), border-color .35s var(--ease), backdrop-filter .35s;
}
.nav.is-stuck{
  background:rgba(11,13,14,.9);
  backdrop-filter:blur(14px) saturate(120%);
  border-bottom-color:var(--ink-line);
}
.nav__in{ display:flex; align-items:center; gap:clamp(18px,3vw,48px); width:100%; max-width:var(--maxw); margin-inline:auto; padding-inline:var(--gut); }

.logo{ display:flex; align-items:center; gap:11px; flex:none; }
.logo__mark{ width:26px; height:26px; flex:none; }
.logo__txt{
  font-family:var(--ff-display);
  font-variation-settings:'wdth' 112,'wght' 800;
  text-transform:uppercase;
  font-size:1.02rem; letter-spacing:.005em;
  color:var(--paper); line-height:1;
}
.logo__txt small{
  display:block;
  font-family:var(--ff-mono);
  font-size:.52rem; letter-spacing:.28em;
  color:var(--steel); font-weight:400; margin-top:3px;
}

.nav__links{ display:flex; gap:clamp(14px,2vw,30px); margin-left:auto; align-items:center; }
.nav__links a{
  font-family:var(--ff-mono);
  font-size:.75rem; letter-spacing:.09em; text-transform:uppercase;
  color:var(--steel-lt);
  padding:.5em 0;
  position:relative;
  transition:color .22s var(--ease);
}
.nav__links a::after{
  content:""; position:absolute; left:0; right:100%; bottom:0; height:1px;
  background:var(--blue); transition:right .3s var(--ease);
}
.nav__links a:hover{ color:var(--paper); }
.nav__links a:hover::after,.nav__links a[aria-current]::after{ right:0; }
.nav__links a[aria-current]{ color:var(--paper); }

.nav__cta{ margin-left:clamp(10px,1.6vw,22px); padding:.72em 1.15em; font-size:.72rem; }

.burger{ display:none; margin-left:auto; background:none; border:1px solid var(--ink-line); padding:9px 11px; cursor:pointer; }
.burger span{ display:block; width:19px; height:1.5px; background:var(--paper); margin:4px 0; transition:transform .3s var(--ease), opacity .3s; }
.nav.is-open .burger span:nth-child(1){ transform:translateY(5.5px) rotate(45deg); }
.nav.is-open .burger span:nth-child(2){ opacity:0; }
.nav.is-open .burger span:nth-child(3){ transform:translateY(-5.5px) rotate(-45deg); }

@media (max-width:960px){
  .burger{ display:block; }
  .nav__links{
    position:fixed; inset:var(--nav-h) 0 auto 0;
    flex-direction:column; align-items:stretch; gap:0;
    background:var(--ink-2); border-bottom:1px solid var(--ink-line);
    padding:8px var(--gut) 22px;
    transform:translateY(-118%); transition:transform .4s var(--ease);
    max-height:calc(100dvh - var(--nav-h)); overflow:auto;
  }
  .nav.is-open .nav__links{ transform:translateY(0); }
  .nav__links a{ padding:.95em 0; border-bottom:1px solid var(--ink-line); font-size:.9rem; }
  .nav__cta{ margin:14px 0 0; justify-content:center; }
}

/* ---------- Pie ---------- */
.foot{ background:var(--ink); border-top:1px solid var(--ink-line); padding-block:clamp(48px,6vw,86px) 26px; }
.foot__grid{ display:grid; grid-template-columns:1.6fr 1fr 1fr 1fr; gap:36px; }
@media (max-width:860px){ .foot__grid{ grid-template-columns:1fr 1fr; } }
@media (max-width:520px){ .foot__grid{ grid-template-columns:1fr; } }
.foot h4{ font-family:var(--ff-mono); font-size:.68rem; letter-spacing:.16em; text-transform:uppercase; color:var(--steel); margin:0 0 1.1em; font-weight:500; }
.foot ul{ list-style:none; margin:0; padding:0; display:grid; gap:.62em; }
.foot li a{ color:var(--steel-lt); font-size:.9rem; transition:color .2s; }
.foot li a:hover{ color:var(--blue); }
.foot__bot{ margin-top:clamp(38px,5vw,64px); padding-top:22px; border-top:1px solid var(--ink-line); display:flex; flex-wrap:wrap; gap:14px 26px; justify-content:space-between; font-family:var(--ff-mono); font-size:.7rem; color:var(--steel); letter-spacing:.05em; }
.foot__addr{ font-style:normal; color:var(--steel-lt); font-size:.9rem; line-height:1.75; }

/* ---------- Aparición al hacer scroll ---------- */
.rise{ opacity:0; transform:translateY(22px); transition:opacity .75s var(--ease), transform .75s var(--ease); }
.rise.in{ opacity:1; transform:none; }
@media (prefers-reduced-motion: reduce){ .rise{ opacity:1; transform:none; } }

/* ---------- Utilidades ---------- */
.vh{ position:absolute; width:1px; height:1px; overflow:hidden; clip:rect(0 0 0 0); white-space:nowrap; }
.skip{ position:absolute; left:-9999px; z-index:200; background:var(--blue); color:#fff; padding:12px 18px; }
.skip:focus{ left:12px; top:12px; }
.hairline{ border:0; border-top:1px solid var(--ink-line); margin:0; }
.section--light .hairline{ border-top-color:#D2D8D8; }