/* ============================================================
   SANTIAGO PONIENTE INVERSIONES — Sistema de diseño
   Technology. Engineering. Operations.
   Paleta derivada de la presentación corporativa premium.
   ============================================================ */

/* ---------- Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body,h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd{margin:0}
ul[class],ol[class]{list-style:none;margin:0;padding:0}
img,svg,video{max-width:100%;display:block}
button,input,select,textarea{font:inherit;color:inherit}
a{color:inherit}

/* ---------- Tokens ---------- */
:root{
  /* --- Fondos corporativos (deck) --- */
  --bg:#071525;
  --bg-2:#0A1B2C;
  --surface:#0E2437;
  --surface-2:#122C42;
  --line:rgba(143,165,184,.16);
  --line-strong:rgba(143,165,184,.32);

  /* --- Texto --- */
  --text:#E9EFF5;
  --text-2:#BDCEDC;
  --muted:#8FA5B8;
  --dim:#6A8095;

  /* --- Acentos de marca --- */
  --brand:#4ED1E0;
  --brand-rgb:78,209,224;
  --brand-deep:#27455E;   /* azul medio */
  --accent:#D8764B;       /* naranja de apoyo */
  --amber:#E0A64B;
  --danger:#E2564F;

  /* --- Acentos del apartado Biogás --- */
  --ch4:#3DDC97;
  --ch4-dim:#1C7A56;
  --energy:#4ED1E0;
  --energy-dim:#166B80;

  --grad-flow:linear-gradient(90deg,var(--brand) 0%,#7FE3EC 55%,#B6EFF4 100%);
  --grad-brand:linear-gradient(90deg,var(--brand) 0%,#6FE0EC 50%,#A9EEF5 100%);

  --font:"Inter",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --r-sm:6px; --r:10px; --r-lg:16px; --r-xl:24px;
  --maxw:1180px;
  --pad:clamp(20px,5vw,48px);

  --shadow:0 1px 2px rgba(0,0,0,.4),0 12px 40px -12px rgba(0,0,0,.6);
}

/* ---------- Base ---------- */
html{scroll-behavior:smooth;scroll-padding-top:90px}
body{
  font-family:var(--font);
  background:var(--bg);
  color:var(--text);
  line-height:1.65;
  font-size:16.5px;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
::selection{background:rgba(var(--brand-rgb),.28);color:#fff}

h1,h2,h3,h4{line-height:1.15;letter-spacing:-.022em;font-weight:650}
h1{font-size:clamp(2.15rem,5.4vw,4rem);letter-spacing:-.035em}
h2{font-size:clamp(1.65rem,3.4vw,2.6rem);letter-spacing:-.03em}
h3{font-size:clamp(1.12rem,1.9vw,1.4rem)}
h4{font-size:1.02rem;font-weight:600}
p{color:var(--text-2)}
strong{color:var(--text);font-weight:600}

.wrap{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--pad)}
.narrow{max-width:860px}
section{position:relative}

/* ---------- Utilidades tipográficas ---------- */
.eyebrow{
  font-family:var(--mono);font-size:.7rem;letter-spacing:.2em;text-transform:uppercase;
  color:var(--brand);display:inline-flex;align-items:center;gap:.6rem;margin-bottom:1rem;font-weight:500;
}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--brand);opacity:.6}
.eyebrow.alt{color:var(--energy)}
.eyebrow.alt::before{background:var(--energy)}
.lead{font-size:clamp(1.03rem,1.6vw,1.2rem);color:var(--text-2);max-width:70ch}
.mono{font-family:var(--mono)}
.grad-text{background:var(--grad-flow);-webkit-background-clip:text;background-clip:text;color:transparent}
.sec-head{max-width:760px;margin-bottom:clamp(2rem,4vw,3.2rem)}
.sec-head p{margin-top:1rem}

/* ---------- Espaciado de secciones ---------- */
.sec{padding-block:clamp(4rem,9vw,7.5rem)}
.sec-sm{padding-block:clamp(3rem,6vw,5rem)}
.sec-alt{background:var(--bg-2);border-block:1px solid var(--line)}

/* ---------- Fondo de rejilla técnica ---------- */
.grid-bg::before{
  content:"";position:absolute;inset:0;pointer-events:none;z-index:0;
  background-image:linear-gradient(var(--line) 1px,transparent 1px),linear-gradient(90deg,var(--line) 1px,transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(ellipse 90% 70% at 50% 0%,#000 10%,transparent 75%);
  -webkit-mask-image:radial-gradient(ellipse 90% 70% at 50% 0%,#000 10%,transparent 75%);
  opacity:.55;
}
.grid-bg > *{position:relative;z-index:1}

/* ============================================================
   HEADER
   ============================================================ */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(7,21,37,.74);
  backdrop-filter:saturate(160%) blur(14px);
  -webkit-backdrop-filter:saturate(160%) blur(14px);
  border-bottom:1px solid transparent;
  transition:border-color .25s,background .25s;
}
.site-header.scrolled{border-bottom-color:var(--line);background:rgba(7,21,37,.94)}
.nav{display:flex;align-items:center;gap:2rem;height:70px}
.brand{display:flex;align-items:center;gap:.7rem;text-decoration:none;flex-shrink:0}
.brand svg{width:32px;height:32px;flex-shrink:0}
.brand-txt{display:flex;flex-direction:column;line-height:1.1}
.brand-txt b{font-size:.92rem;font-weight:650;letter-spacing:-.01em}
.brand-txt span{font-family:var(--mono);font-size:.58rem;letter-spacing:.16em;color:var(--dim);text-transform:uppercase}

.nav-links{display:flex;align-items:center;gap:.25rem;margin-left:auto}
.nav-links a{
  text-decoration:none;font-size:.875rem;color:var(--text-2);
  padding:.5rem .8rem;border-radius:var(--r-sm);transition:color .18s,background .18s;font-weight:450;
}
.nav-links a:hover{color:var(--text);background:rgba(255,255,255,.05)}
.nav-links a.active{color:var(--brand)}
.nav-cta{
  margin-left:.6rem;text-decoration:none;font-size:.85rem;font-weight:550;
  padding:.56rem 1.05rem;border-radius:999px;
  background:var(--brand);color:#04121F;white-space:nowrap;
  transition:transform .18s,box-shadow .18s;
}
.nav-cta:hover{transform:translateY(-1px);box-shadow:0 6px 22px -6px rgba(var(--brand-rgb),.6)}

.nav-toggle{display:none;background:none;border:1px solid var(--line);border-radius:var(--r-sm);padding:.45rem .55rem;cursor:pointer;margin-left:auto}
.nav-toggle svg{width:20px;height:20px;stroke:var(--text)}

@media(max-width:940px){
  .nav-links{
    position:fixed;inset:70px 0 auto 0;flex-direction:column;align-items:stretch;gap:0;
    background:var(--bg-2);border-bottom:1px solid var(--line);padding:.6rem var(--pad) 1.4rem;
    margin-left:0;transform:translateY(-12px);opacity:0;pointer-events:none;transition:.22s;
    max-height:calc(100vh - 70px);overflow-y:auto;
  }
  .nav-links.open{transform:none;opacity:1;pointer-events:auto}
  .nav-links a{padding:.85rem .2rem;border-bottom:1px solid var(--line);font-size:1rem}
  .nav-cta{margin:1rem 0 0;text-align:center;padding:.85rem}
  .nav-toggle{display:block}
}

/* ============================================================
   HERO
   ============================================================ */
.hero{padding-top:clamp(3.5rem,8vw,6rem);padding-bottom:clamp(3rem,7vw,5.5rem);overflow:hidden}
.hero-glow{
  position:absolute;top:-30%;left:50%;transform:translateX(-50%);
  width:min(1100px,120vw);height:700px;pointer-events:none;z-index:0;
  background:radial-gradient(ellipse at center,rgba(var(--brand-rgb),.16) 0%,rgba(78,209,224,.09) 38%,transparent 68%);
  filter:blur(20px);
}
.hero-inner{position:relative;z-index:2}
.hero h1{margin-bottom:1.5rem;max-width:16ch}
.hero .lead{font-size:clamp(1.05rem,1.75vw,1.28rem);max-width:62ch}
.hero-actions{display:flex;flex-wrap:wrap;gap:.85rem;margin-top:2.2rem}

.btn{
  display:inline-flex;align-items:center;gap:.55rem;text-decoration:none;
  padding:.8rem 1.5rem;border-radius:999px;font-size:.92rem;font-weight:550;
  border:1px solid transparent;cursor:pointer;transition:.2s;white-space:nowrap;
}
.btn-primary{background:var(--brand);color:#04121F}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 10px 30px -8px rgba(var(--brand-rgb),.55)}
.btn-ghost{border-color:var(--line-strong);color:var(--text);background:rgba(255,255,255,.02)}
.btn-ghost:hover{border-color:var(--brand);color:var(--brand);background:rgba(var(--brand-rgb),.06)}
.btn svg{width:16px;height:16px;flex-shrink:0}

/* Métricas del hero */
.hero-stats{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));
  gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--r-lg);
  overflow:hidden;margin-top:clamp(3rem,6vw,4.5rem);
}
.hero-stats div{background:var(--bg);padding:1.4rem 1.3rem}
.hero-stats b{display:block;font-family:var(--mono);font-size:1.6rem;font-weight:500;color:var(--brand);letter-spacing:-.02em}
.hero-stats span{font-size:.79rem;color:var(--muted);display:block;margin-top:.3rem;line-height:1.45}

/* ============================================================
   CADENA POZO -> MWh
   ============================================================ */
.chain{
  border:1px solid var(--line);border-radius:var(--r-xl);background:var(--surface);
  padding:clamp(1.4rem,3vw,2.4rem);position:relative;overflow:hidden;
}
.chain::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:radial-gradient(ellipse 70% 100% at 50% 120%,rgba(78,209,224,.10),transparent 70%);
}
.chain-title{
  font-family:var(--mono);font-size:.68rem;letter-spacing:.2em;text-transform:uppercase;
  color:var(--dim);margin-bottom:1.6rem;display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;
}
.chain-title em{font-style:normal;color:var(--brand)}

.chain-track{display:flex;align-items:stretch;gap:0;position:relative;z-index:1}
.node{
  flex:1;min-width:0;text-align:center;padding:1.1rem .5rem;border-radius:var(--r);
  border:1px solid transparent;transition:.35s;position:relative;
}
.node.on{border-color:rgba(var(--brand-rgb),.45);background:rgba(var(--brand-rgb),.07)}
.node .dot{
  width:11px;height:11px;border-radius:50%;background:var(--dim);margin:0 auto .7rem;
  transition:.35s;box-shadow:0 0 0 0 rgba(var(--brand-rgb),0);
}
.node.on .dot{background:var(--brand);box-shadow:0 0 0 6px rgba(var(--brand-rgb),.14)}
.node.on.last .dot{background:var(--energy);box-shadow:0 0 0 6px rgba(78,209,224,.16)}
.node.on.last{border-color:rgba(78,209,224,.45);background:rgba(78,209,224,.07)}
.node b{display:block;font-family:var(--mono);font-size:.76rem;letter-spacing:.11em;text-transform:uppercase;color:var(--text)}
.node small{display:block;font-size:.71rem;color:var(--muted);margin-top:.35rem;line-height:1.4}
.node.on small{color:var(--text-2)}
.arrow{display:flex;align-items:center;color:var(--dim);flex:0 0 auto;padding-top:.2rem}
.arrow svg{width:16px;height:16px}

.chain-layers{
  display:flex;gap:.5rem;flex-wrap:wrap;margin-top:1.6rem;padding-top:1.4rem;
  border-top:1px dashed var(--line-strong);position:relative;z-index:1;
}
.layer-chip{
  font-family:var(--mono);font-size:.66rem;letter-spacing:.13em;text-transform:uppercase;
  padding:.36rem .7rem;border-radius:999px;border:1px solid var(--line);color:var(--muted);
  transition:.3s;flex:1 1 auto;text-align:center;
}
.layer-chip.on{border-color:rgba(78,209,224,.5);color:var(--energy);background:rgba(78,209,224,.07)}

@media(max-width:820px){
  .chain-track{flex-direction:column}
  .node{text-align:left;display:flex;align-items:center;gap:.9rem;padding:.8rem}
  .node .dot{margin:0}
  .node b{font-size:.72rem}
  .node small{margin-top:.1rem}
  .node > div{min-width:0}
  .arrow{transform:rotate(90deg);justify-content:center;padding:.15rem 0}
}

/* ============================================================
   CARDS / GRIDS
   ============================================================ */
.grid{display:grid;gap:1.15rem}
.g2{grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}
.g3{grid-template-columns:repeat(auto-fit,minmax(268px,1fr))}
.g4{grid-template-columns:repeat(auto-fit,minmax(215px,1fr))}

.card{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:clamp(1.3rem,2.3vw,1.8rem);transition:.25s;position:relative;overflow:hidden;
}
.card:hover{border-color:var(--line-strong);transform:translateY(-3px);box-shadow:var(--shadow)}
.card h3{margin-bottom:.6rem;padding-right:2.5rem}
.card p{font-size:.925rem}
.card .ico{
  width:40px;height:40px;border-radius:var(--r-sm);display:grid;place-items:center;
  background:rgba(var(--brand-rgb),.1);border:1px solid rgba(var(--brand-rgb),.22);margin-bottom:1.1rem;
}
.card .ico svg{width:20px;height:20px;stroke:var(--brand);fill:none;stroke-width:1.6}
.card.energy .ico{background:rgba(78,209,224,.1);border-color:rgba(78,209,224,.22)}
.card.energy .ico svg{stroke:var(--energy)}
.card .num{
  font-family:var(--mono);font-size:.7rem;color:var(--dim);letter-spacing:.14em;
  position:absolute;top:1.3rem;right:1.3rem;
}

/* Lista con check */
.checklist{display:grid;gap:.62rem;margin-top:1rem}
.checklist li{display:flex;gap:.7rem;font-size:.9rem;color:var(--text-2);line-height:1.55}
.checklist li::before{
  content:"";flex:0 0 auto;width:15px;height:15px;margin-top:.32rem;border-radius:4px;
  background-color:rgba(var(--brand-rgb),.13);border:1px solid rgba(var(--brand-rgb),.34);
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%234ED1E0' stroke-width='3.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E");
  background-size:11px;background-repeat:no-repeat;background-position:center;
}
.checklist.dash li::before{
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' stroke='%237E93A3' stroke-width='3.4' stroke-linecap='round'%3E%3Cline x1='5' y1='12' x2='19' y2='12'/%3E%3C/svg%3E");
  background-color:rgba(255,255,255,.04);border-color:var(--line-strong);
}

/* Chips de variables */
.chips{display:flex;flex-wrap:wrap;gap:.45rem;margin-top:1.1rem}
.chip{
  font-family:var(--mono);font-size:.72rem;padding:.32rem .68rem;border-radius:var(--r-sm);
  background:rgba(255,255,255,.035);border:1px solid var(--line);color:var(--text-2);
}
.chip.hi{border-color:rgba(var(--brand-rgb),.38);color:var(--brand);background:rgba(var(--brand-rgb),.07)}
.chip.en{border-color:rgba(78,209,224,.38);color:var(--energy);background:rgba(78,209,224,.07)}

/* ============================================================
   ECUACIONES / CALLOUTS
   ============================================================ */
.eq{
  background:var(--bg-2);border:1px solid var(--line);border-left:3px solid var(--brand);
  border-radius:var(--r);padding:1.2rem 1.4rem;margin:1.4rem 0;
}
.eq .eq-label{
  font-family:var(--mono);font-size:.67rem;letter-spacing:.16em;text-transform:uppercase;
  color:var(--brand);display:block;margin-bottom:.6rem;
}
.eq code{font-family:var(--mono);font-size:clamp(.85rem,1.5vw,1.02rem);color:var(--text);display:block;overflow-x:auto;padding-bottom:.2rem}
.eq .eq-note{font-size:.82rem;color:var(--muted);margin-top:.75rem;line-height:1.6}

.callout{
  border:1px solid rgba(240,166,46,.28);border-radius:var(--r-lg);padding:1.3rem 1.5rem;
  background:linear-gradient(180deg,rgba(240,166,46,.06),transparent);
  margin:1.6rem 0;
}
.callout .tag{
  font-family:var(--mono);font-size:.66rem;letter-spacing:.18em;text-transform:uppercase;
  color:var(--amber);display:block;margin-bottom:.55rem;
}
.callout p{font-size:.93rem;color:var(--text-2)}
.callout.q{background:linear-gradient(180deg,rgba(78,209,224,.06),transparent);border-color:rgba(78,209,224,.28)}
.callout.q .tag{color:var(--energy)}

/* ============================================================
   TABLAS
   ============================================================ */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--r-lg);margin-top:1.5rem;background:var(--surface)}
table{width:100%;border-collapse:collapse;font-size:.875rem;min-width:640px}
thead th{
  text-align:left;font-family:var(--mono);font-size:.67rem;letter-spacing:.14em;text-transform:uppercase;
  color:var(--muted);font-weight:500;padding:.95rem 1.1rem;border-bottom:1px solid var(--line-strong);
  background:var(--bg-2);white-space:nowrap;
}
tbody td{padding:.95rem 1.1rem;border-bottom:1px solid var(--line);color:var(--text-2);vertical-align:top;line-height:1.55}
tbody tr:last-child td{border-bottom:none}
tbody tr:hover td{background:rgba(255,255,255,.018)}
tbody td:first-child{color:var(--text);font-weight:550}
.lvl{font-family:var(--mono);font-size:.75rem;padding:.2rem .55rem;border-radius:4px;white-space:nowrap;display:inline-block}
.lvl-1{background:rgba(226,86,79,.14);color:#F08A84}
.lvl-2{background:rgba(240,166,46,.14);color:var(--amber)}
.lvl-3{background:rgba(var(--brand-rgb),.14);color:var(--brand)}
.lvl-4{background:rgba(78,209,224,.16);color:var(--energy)}

/* ============================================================
   TIMELINE / SECUENCIA
   ============================================================ */
.steps{counter-reset:s;display:grid;gap:0;margin-top:2rem}
.step{display:grid;grid-template-columns:auto 1fr;gap:1.4rem;padding-bottom:2rem;position:relative}
.step:last-child{padding-bottom:0}
.step .bullet{
  counter-increment:s;
  font-family:var(--mono);font-size:.72rem;color:var(--brand);
  width:38px;height:38px;border-radius:50%;display:grid;place-items:center;
  border:1px solid rgba(var(--brand-rgb),.35);background:rgba(var(--brand-rgb),.07);z-index:1;position:relative;
}
.step .bullet::before{content:counter(s,decimal-leading-zero)}
.step::after{
  content:"";position:absolute;left:19px;top:38px;bottom:0;width:1px;
  background:linear-gradient(180deg,rgba(var(--brand-rgb),.35),var(--line));
}
.step:last-child::after{display:none}
.step h4{margin-bottom:.35rem;color:var(--text)}
.step p{font-size:.9rem}
.step .letter{font-size:.78rem;font-weight:600}

/* ============================================================
   ACORDEÓN
   ============================================================ */
.acc{border-top:1px solid var(--line)}
.acc details{border-bottom:1px solid var(--line)}
.acc summary{
  cursor:pointer;list-style:none;padding:1.15rem 2.5rem 1.15rem 0;position:relative;
  font-weight:550;font-size:1rem;color:var(--text);transition:color .18s;
}
.acc summary::-webkit-details-marker{display:none}
.acc summary:hover{color:var(--brand)}
.acc summary::after{
  content:"";position:absolute;right:.4rem;top:1.45rem;width:12px;height:12px;
  background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%237E93A3' stroke-width='2.6' stroke-linecap='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E") no-repeat center/contain;
  transition:transform .25s;
}
.acc details[open] summary::after{transform:rotate(180deg)}
.acc .acc-body{padding-bottom:1.4rem;font-size:.925rem;color:var(--text-2);max-width:80ch}
.acc .acc-body p+p{margin-top:.8rem}

/* ============================================================
   CTA BANNER
   ============================================================ */
.cta{
  border:1px solid rgba(var(--brand-rgb),.24);border-radius:var(--r-xl);
  background:linear-gradient(135deg,rgba(var(--brand-rgb),.09),rgba(78,209,224,.06) 60%,transparent);
  padding:clamp(2rem,5vw,3.4rem);text-align:center;position:relative;overflow:hidden;
}
.cta h2{margin-bottom:1rem}
.cta p{margin-inline:auto;max-width:56ch}
.cta .hero-actions{justify-content:center}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer{border-top:1px solid var(--line);background:var(--bg-2);padding-block:clamp(2.8rem,5vw,4rem) 2rem}
.foot-grid{display:grid;grid-template-columns:1.7fr repeat(3,1fr);gap:2.4rem}
.foot-grid h5{font-family:var(--mono);font-size:.67rem;letter-spacing:.17em;text-transform:uppercase;color:var(--dim);margin-bottom:1rem;font-weight:500}
.foot-grid ul{display:grid;gap:.6rem}
.foot-grid a{text-decoration:none;font-size:.875rem;color:var(--text-2);transition:color .18s}
.foot-grid a:hover{color:var(--brand)}
.foot-about p{font-size:.875rem;margin-top:1rem;max-width:40ch}
.foot-bottom{
  display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;
  border-top:1px solid var(--line);margin-top:2.6rem;padding-top:1.5rem;
  font-size:.79rem;color:var(--dim);
}
.foot-bottom a{color:var(--muted);text-decoration:none}
.foot-bottom a:hover{color:var(--brand)}
@media(max-width:820px){.foot-grid{grid-template-columns:1fr 1fr}.foot-about{grid-column:1/-1}}

/* ============================================================
   PÁGINA INTERIOR
   ============================================================ */
.page-head{padding-top:clamp(3rem,6vw,4.5rem);padding-bottom:clamp(2rem,4vw,3rem);border-bottom:1px solid var(--line);overflow:hidden}
.page-head h1{font-size:clamp(1.9rem,4.4vw,3.1rem);max-width:20ch}
.page-head .lead{margin-top:1.2rem}
.crumb{font-family:var(--mono);font-size:.72rem;color:var(--dim);margin-bottom:1rem;letter-spacing:.06em}
.crumb a{text-decoration:none;color:var(--muted)}
.crumb a:hover{color:var(--brand)}

/* ---------- Documento con TOC ---------- */
.doc{display:grid;grid-template-columns:235px 1fr;gap:clamp(2rem,5vw,4rem);align-items:start}
.toc{position:sticky;top:96px;border-left:1px solid var(--line);padding-left:1.2rem}
.toc h5{font-family:var(--mono);font-size:.65rem;letter-spacing:.17em;text-transform:uppercase;color:var(--dim);margin-bottom:1rem;font-weight:500}
.toc ul{display:grid;gap:.55rem}
.toc a{text-decoration:none;font-size:.83rem;color:var(--muted);transition:color .18s;display:block;line-height:1.4}
.toc a:hover,.toc a.active{color:var(--brand)}
.doc-body > section{padding-bottom:clamp(2.6rem,5vw,4rem)}
.doc-body h2{margin-bottom:1rem}
.doc-body h3{margin:2rem 0 .8rem}
.doc-body p+p{margin-top:1rem}
.doc-body p{max-width:76ch}
@media(max-width:980px){.doc{grid-template-columns:1fr}.toc{position:static;border-left:none;border-top:1px solid var(--line);padding:1.4rem 0 0;margin-bottom:1rem}.toc ul{grid-template-columns:repeat(auto-fit,minmax(180px,1fr))}}

/* ============================================================
   FORMULARIO
   ============================================================ */
.form{display:grid;gap:1.1rem}
.field{display:grid;gap:.45rem}
.field label{font-size:.76rem;font-family:var(--mono);letter-spacing:.09em;text-transform:uppercase;color:var(--muted)}
.field input,.field select,.field textarea{
  background:var(--bg-2);border:1px solid var(--line);border-radius:var(--r);
  padding:.8rem 1rem;color:var(--text);font-size:.94rem;transition:border-color .18s,box-shadow .18s;width:100%;
}
.field input:focus,.field select:focus,.field textarea:focus{
  outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(var(--brand-rgb),.13);
}
.field textarea{resize:vertical;min-height:130px;font-family:inherit}
.field select{appearance:none;-webkit-appearance:none;cursor:pointer;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%237E93A3' stroke-width='2.4' stroke-linecap='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 1rem center;background-size:14px;padding-right:2.6rem;
}
.field select option{background:#0B1218;color:#E7EFF5}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:1.1rem}
@media(max-width:640px){.form-row{grid-template-columns:1fr}}
.form-note{font-size:.79rem;color:var(--dim);line-height:1.6}
.form-status{font-size:.88rem;padding:.85rem 1rem;border-radius:var(--r);display:none}
.form-status.ok{display:block;background:rgba(var(--brand-rgb),.1);border:1px solid rgba(var(--brand-rgb),.3);color:var(--brand)}
.form-status.err{display:block;background:rgba(226,86,79,.1);border:1px solid rgba(226,86,79,.3);color:#F08A84}

.contact-item{display:flex;gap:.9rem;padding:1rem 0;border-bottom:1px solid var(--line)}
.contact-item:last-child{border-bottom:none}
.contact-item svg{width:18px;height:18px;stroke:var(--brand);fill:none;stroke-width:1.6;flex-shrink:0;margin-top:.28rem}
.contact-item b{display:block;font-size:.72rem;font-family:var(--mono);letter-spacing:.11em;text-transform:uppercase;color:var(--muted);font-weight:500;margin-bottom:.15rem}
.contact-item span,.contact-item a{font-size:.94rem;color:var(--text);text-decoration:none;word-break:break-word}
.contact-item a:hover{color:var(--brand)}

/* ============================================================
   MISC
   ============================================================ */
.quote-strip{display:grid;gap:1px;background:var(--line);border-block:1px solid var(--line);grid-template-columns:repeat(auto-fit,minmax(320px,1fr))}
.quote-strip blockquote{background:var(--bg);padding:clamp(1.6rem,3.5vw,2.4rem);margin:0}
.quote-strip p{font-size:clamp(1.02rem,1.8vw,1.28rem);color:var(--text);letter-spacing:-.015em;line-height:1.42;font-weight:450}
.quote-strip cite{display:block;font-style:normal;font-family:var(--mono);font-size:.68rem;letter-spacing:.15em;text-transform:uppercase;color:var(--dim);margin-top:.9rem}

.badge-row{display:flex;flex-wrap:wrap;gap:.5rem;margin-top:1.4rem}
.badge{
  font-family:var(--mono);font-size:.68rem;letter-spacing:.1em;padding:.4rem .75rem;
  border:1px solid var(--line);border-radius:999px;color:var(--muted);background:rgba(255,255,255,.025);
}

.refs{display:grid;gap:.9rem;counter-reset:r}
.refs li{
  display:grid;grid-template-columns:auto 1fr;gap:.9rem;font-size:.85rem;color:var(--text-2);
  padding-bottom:.9rem;border-bottom:1px solid var(--line);line-height:1.6;
}
.refs li::before{counter-increment:r;content:"[" counter(r) "]";font-family:var(--mono);color:var(--brand);font-size:.8rem}
.refs a{color:var(--muted);word-break:break-all;text-decoration:none;border-bottom:1px solid var(--line-strong)}
.refs a:hover{color:var(--brand)}

.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s cubic-bezier(.2,.7,.3,1),transform .6s cubic-bezier(.2,.7,.3,1)}
.reveal.in{opacity:1;transform:none}

.skip{position:absolute;left:-9999px;top:0;background:var(--brand);color:#04121F;padding:.7rem 1.2rem;border-radius:0 0 var(--r) 0;z-index:100;text-decoration:none;font-size:.85rem;font-weight:600}
.skip:focus{left:0}

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

@media(prefers-reduced-motion:reduce){
  *{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none}
}

/* ============================================================
   WORDMARK
   ============================================================ */
.wordmark{display:flex;align-items:center;gap:.62rem;text-decoration:none;flex-shrink:0}
.wordmark .mark{
  width:30px;height:30px;flex-shrink:0;border-radius:8px;
  background:linear-gradient(140deg,var(--brand) 0%,#2E93A8 60%,var(--brand-deep) 100%);
  display:grid;place-items:center;
}
.wordmark .mark svg{width:17px;height:17px;stroke:#04121F;fill:none;stroke-width:2.2}
.wordmark-txt{display:flex;flex-direction:column;line-height:1.05}
.wordmark-txt b{font-size:.86rem;font-weight:650;letter-spacing:.055em;color:var(--text);white-space:nowrap}
.wordmark-txt span{
  font-family:var(--mono);font-size:.55rem;letter-spacing:.3em;
  color:var(--brand);text-transform:uppercase;
}
.site-footer .wordmark-txt b{font-size:.98rem}

/* ============================================================
   HERO CON IMAGEN DE FONDO
   ============================================================ */
.hero-photo{
  position:absolute;inset:0;z-index:0;overflow:hidden;pointer-events:none;
}
.hero-photo img{
  width:100%;height:100%;object-fit:cover;object-position:70% 50%;opacity:.62;
}
.hero-photo::after{
  content:"";position:absolute;inset:0;
  background:
    linear-gradient(90deg,var(--bg) 0%,rgba(7,21,37,.92) 34%,rgba(7,21,37,.42) 66%,rgba(7,21,37,.72) 100%),
    linear-gradient(180deg,rgba(7,21,37,.55) 0%,transparent 25%,var(--bg) 97%);
}
.hero.with-photo{min-height:min(78vh,720px);display:flex;align-items:center}
.hero.with-photo .hero-inner{width:100%}
.tagline{
  font-family:var(--mono);font-size:clamp(.7rem,1.6vw,.82rem);letter-spacing:.34em;
  text-transform:uppercase;color:var(--brand);margin-bottom:1.3rem;
}

/* ============================================================
   MURO DE LOGOS
   ============================================================ */
.logo-wall{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(132px,1fr));
  gap:1px;background:var(--line);border:1px solid var(--line);
  border-radius:var(--r-lg);overflow:hidden;margin-top:2rem;
}
.logo-wall figure{
  background:var(--bg);margin:0;aspect-ratio:16/9;
  display:grid;place-items:center;padding:1.1rem;transition:background .25s;
}
.logo-wall figure:hover{background:var(--surface)}
.logo-wall img{
  max-height:44px;width:auto;max-width:100%;object-fit:contain;
  filter:grayscale(1) brightness(1.9) contrast(.72);
  opacity:.62;transition:filter .3s,opacity .3s,transform .3s;
}
.logo-wall figure:hover img{filter:none;opacity:1;transform:scale(1.04)}
.logo-wall.dense{grid-template-columns:repeat(auto-fill,minmax(110px,1fr))}
.logo-wall.dense img{max-height:34px}

/* ============================================================
   PILARES NUMERADOS (Entender · Diseñar · Implementar · Operar)
   ============================================================ */
.pillars{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
  gap:1px;background:var(--line);border:1px solid var(--line);
  border-radius:var(--r-lg);overflow:hidden;
}
.pillar{background:var(--bg);padding:clamp(1.4rem,2.6vw,2rem);position:relative;transition:background .25s}
.pillar:hover{background:var(--surface)}
.pillar .step-n{
  font-family:var(--mono);font-size:.72rem;letter-spacing:.15em;color:var(--brand);
  display:block;margin-bottom:1.4rem;
}
.pillar h3{margin-bottom:.5rem}
.pillar p{font-size:.9rem}
.pillar::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;
  background:var(--brand);transform:scaleX(0);transform-origin:left;transition:transform .3s;
}
.pillar:hover::after{transform:scaleX(1)}

/* ============================================================
   LISTA DE INDUSTRIAS
   ============================================================ */
.industries{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:0 clamp(1.5rem,4vw,3.5rem)}
.industry{
  display:flex;align-items:baseline;gap:1.1rem;padding:1.1rem 0;
  border-bottom:1px solid var(--line);transition:padding-left .25s,border-color .25s;
}
.industry:hover{padding-left:.6rem;border-color:var(--line-strong)}
.industry b{font-family:var(--mono);font-size:.76rem;color:var(--brand);flex-shrink:0}
.industry span{font-size:1rem;color:var(--text-2);transition:color .2s}
.industry:hover span{color:var(--text)}

/* ============================================================
   TARJETAS DE PROYECTO
   ============================================================ */
.project{
  background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);
  padding:clamp(1.3rem,2.3vw,1.7rem);transition:.25s;display:flex;flex-direction:column;gap:.7rem;
}
.project:hover{border-color:rgba(var(--brand-rgb),.4);transform:translateY(-3px);box-shadow:var(--shadow)}
.project .client{
  font-family:var(--mono);font-size:.72rem;letter-spacing:.14em;text-transform:uppercase;color:var(--brand);
}
.project h3{font-size:1.05rem;line-height:1.35}
.project p{font-size:.9rem}
.project .tagline-mini{
  margin-top:auto;padding-top:.9rem;border-top:1px solid var(--line);
  font-size:.76rem;color:var(--dim);font-family:var(--mono);letter-spacing:.06em;
}

/* ============================================================
   ÁMBITO BIOGÁS — el acento pasa a verde metano
   ============================================================ */
body.biogas{
  --brand:#3DDC97;
  --brand-rgb:61,220,151;
  --brand-deep:#1C7A56;
}
body.biogas .checklist li::before{
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%233DDC97' stroke-width='3.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E");
}
body.biogas .wordmark .mark{background:linear-gradient(140deg,#3DDC97 0%,#2BA9A6 60%,var(--brand-deep) 100%)}
body.biogas .wordmark-txt span{color:var(--brand)}
.sub-brand{
  display:inline-flex;align-items:center;gap:.5rem;font-family:var(--mono);
  font-size:.6rem;letter-spacing:.2em;text-transform:uppercase;color:var(--ch4);
  border:1px solid rgba(61,220,151,.35);background:rgba(61,220,151,.08);
  padding:.28rem .6rem;border-radius:999px;margin-left:.55rem;white-space:nowrap;
}
@media(max-width:520px){.sub-brand{display:none}}