:root{
    --ink:#141414;
    --ink-soft:#232323;
    --cream:#f2f2f2;
    --paper:#fafafa;
    --steel:#e2362a;
    --steel-deep:#b8281e;
    --stone:#8c8c8c;
    --line-dark:rgba(243,243,243,.16);
    --line-light:rgba(20,20,20,.12);
    --maxw:1240px;
  }
  *{box-sizing:border-box;}
  html{scroll-behavior:smooth;}
  body{
    margin:0;
    background:var(--cream);
    color:var(--ink);
    font-family:'Archivo',sans-serif;
    font-weight:400;
    -webkit-font-smoothing:antialiased;
  }
  img{max-width:100%;display:block;}
  a{color:inherit;}
  .accent{font-family:'Newsreader',serif;font-style:italic;font-weight:400;}
  .wrap{max-width:var(--maxw);margin:0 auto;padding:0 28px;}
  h1,h2,h3{margin:0;line-height:1.05;font-weight:900;letter-spacing:-0.01em;}
  p{line-height:1.65;}
  .eyebrow{
    font-size:13px;letter-spacing:.03em;color:var(--steel);font-weight:600;
  }

  /* NAV */
  header.site-nav{
    position:fixed;top:0;left:0;right:0;z-index:100;
    display:flex;align-items:center;justify-content:space-between;
    padding:20px 28px;
    background:linear-gradient(to bottom, rgba(20,24,29,.55), rgba(20,24,29,0));
    transition:background .3s ease, padding .3s ease;
  }
  header.site-nav.scrolled{
    background:rgba(20,24,29,.94);
    padding:14px 28px;
    border-bottom:1px solid var(--line-dark);
  }
  .brand{display:flex;align-items:center;gap:9px;color:var(--cream);font-weight:900;font-size:15px;letter-spacing:0.01em;text-decoration:none;white-space:nowrap;}
  .brand .mark{width:34px;height:22px;}
  nav.links{display:flex;gap:34px;align-items:center;}
  nav.links a{color:var(--cream);text-decoration:none;font-size:14px;font-weight:500;opacity:.88;}
  nav.links a:hover{opacity:1;}
  .nav-cta{
    color:var(--ink) !important;background:var(--cream);padding:10px 20px;
    font-size:14px;font-weight:700;text-decoration:none;opacity:1 !important;
  }
  .burger{display:none;background:none;border:0;color:var(--cream);font-size:26px;cursor:pointer;}
  .mobile-menu{
    display:none;position:fixed;inset:0;background:var(--ink);z-index:99;
    flex-direction:column;align-items:flex-start;justify-content:center;gap:26px;padding:40px;
  }
  .mobile-menu.open{display:flex;}
  .mobile-menu a{color:var(--cream);font-size:28px;font-weight:700;text-decoration:none;}
  .mobile-close{position:absolute;top:22px;right:24px;background:none;border:0;color:var(--cream);font-size:30px;}

  /* HERO */
  .hero{
    position:relative;min-height:100svh;display:flex;align-items:flex-end;
    background:#000 url('../img/fondo-hero.jpg') center/cover no-repeat;
    color:var(--cream);
  }
  .hero::before{
    content:"";position:absolute;inset:0;
    background:linear-gradient(180deg, rgba(15,18,22,.55) 0%, rgba(15,18,22,.35) 40%, rgba(15,18,22,.92) 100%);
  }
  .hero-inner{position:relative;z-index:1;width:100%;padding:0 28px 72px;max-width:var(--maxw);margin:0 auto;}
  .hero-mark{width:104px;margin-bottom:24px;}
  .hero h1{font-size:clamp(40px,8vw,84px);text-transform:uppercase;}
  .hero .since{
    margin-top:18px;font-size:clamp(16px,2.4vw,22px);color:var(--steel);font-weight:600;
  }
  .hero-scroll{
    position:absolute;bottom:26px;right:28px;z-index:1;color:var(--cream);
    font-size:12px;letter-spacing:.05em;display:flex;align-items:center;gap:10px;opacity:.75;
  }
  .hero-scroll .line{width:1px;height:34px;background:var(--cream);opacity:.6;}

  /* QUIENES SOMOS */
  .somos{padding:120px 0 90px;}
  .somos-grid{display:grid;grid-template-columns:1fr 1.3fr;gap:70px;align-items:start;}
  .somos h2{font-size:clamp(34px,5vw,52px);text-transform:uppercase;}
  .somos p{font-size:17px;color:var(--ink-soft);max-width:52ch;}
  .somos p + p{margin-top:16px;}

  /* NUMBERS */
  .numeros{background:var(--ink);color:var(--cream);padding:80px 0;}
  .numeros .wrap{display:grid;grid-template-columns:repeat(3,1fr);gap:40px;}
  .num-item{border-top:1px solid var(--line-dark);padding-top:22px;}
  .num-item .big{font-size:clamp(38px,5vw,56px);font-weight:900;}
  .num-item .label{color:var(--stone);font-size:14px;margin-top:6px;}
  .numeros-extra{
    max-width:var(--maxw);margin:44px auto 0;padding:0 28px;
    display:grid;grid-template-columns:1fr 1fr;gap:30px;
    border-top:1px solid var(--line-dark);padding-top:30px;
  }
  .numeros-extra div{font-size:14px;color:var(--stone);line-height:1.6;}
  .numeros-extra strong{color:var(--cream);display:block;font-size:16px;margin-bottom:4px;font-weight:700;}

  /* INDUSTRIAS */
  .industrias{
    position:relative;padding:150px 0;color:var(--cream);
    background:#000 url('../img/fondo-industrias.jpg') center/cover no-repeat;
  }
  .industrias::before{content:"";position:absolute;inset:0;background:linear-gradient(90deg, rgba(15,18,22,.35) 0%, rgba(15,18,22,.82) 55%, rgba(15,18,22,.92) 100%);}
  .industrias .wrap{position:relative;z-index:1;}
  .industrias-head{max-width:560px;margin-left:auto;text-align:right;}
  .industrias-head h2{font-size:clamp(36px,6vw,64px);text-transform:uppercase;}
  .industrias-head h2 .accent{display:block;font-size:1.05em;color:var(--steel);text-transform:none;}
  .industrias-list{
    margin-top:56px;display:grid;grid-template-columns:repeat(3,1fr);gap:1px;
    background:var(--line-dark);border-top:1px solid var(--line-dark);
  }
  .industrias-list div{background:var(--ink);padding:24px 20px;}
  .industrias-list .m2{font-size:22px;font-weight:900;color:var(--steel);}
  .industrias-list .name{font-size:13px;color:var(--cream);margin-top:6px;opacity:.85;}

  /* SECTION TITLE BANDS (photo + big label, used before each category) */
  .cat-title{
    position:relative;min-height:56vh;display:flex;align-items:flex-end;color:var(--cream);
    background:#000 center/cover no-repeat;
  }
  .cat-title::before{content:"";position:absolute;inset:0;background:linear-gradient(180deg, rgba(15,18,22,.15) 0%, rgba(15,18,22,.88) 100%);}
  .cat-title .wrap{position:relative;z-index:1;padding-bottom:56px;display:flex;justify-content:space-between;align-items:flex-end;gap:24px;flex-wrap:wrap;}
  .cat-title h2{font-size:clamp(38px,6vw,68px);text-transform:uppercase;}
  .cat-title .cat-note{max-width:340px;font-size:15px;color:var(--stone);padding-bottom:8px;}
  #cat-salud{background-image:url('../img/fondo-cat-salud.jpg');}
  #cat-educacion{background-image:url('../img/fondo-cat-educacion.jpg');}
  #cat-infra{background-image:url('../img/fondo-cat-infra.jpg');}
  #cat-edificios{background-image:url('../img/fondo-cat-edificios.jpg');}
  #cat-habitacional{background-image:url('../img/fondo-cat-habitacional.jpg');}
  .cat-credit{font-size:12px;color:var(--stone);margin-top:10px;letter-spacing:.01em;}

  /* PROYECTOS INTRO */
  .proyectos-intro{
    position:relative;padding:130px 0 70px;color:var(--ink);
    background:var(--cream);
  }
  .proyectos-intro .eyebrow{display:block;margin-bottom:18px;}
  .proyectos-intro h2{font-size:clamp(34px,6vw,58px);text-transform:uppercase;max-width:16ch;}
  .proyectos-intro h2 .accent{color:var(--steel);text-transform:none;display:block;}
  .proyectos-intro p{margin-top:24px;max-width:46ch;color:var(--ink-soft);font-size:17px;}
  .proyectos-intro .cat-credit{color:var(--stone);}

  /* PROJECT GRID */
  .cat-body{padding:64px 0 40px;}
  .project-row{
    display:grid;grid-template-columns:1.1fr .9fr;gap:44px;
    padding:44px 0;border-top:1px solid var(--line-light);
    align-items:start;
  }
  .project-row:last-child{border-bottom:1px solid var(--line-light);}
  .project-row .shot img{width:100%;height:340px;object-fit:cover;}
  .project-row .shot.tall img{height:420px;}
  .project-thumbs{display:grid;grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:10px;margin-top:14px;}
  .project-thumbs img{width:100%;height:150px;object-fit:cover;}
  .project-thumbs.single{grid-template-columns:1fr;max-width:280px;}
  .project-thumbs.single img{height:190px;}
  .project-info h3{font-size:clamp(24px,3vw,32px);text-transform:uppercase;}
  .project-info .desc{margin-top:12px;font-size:16px;color:var(--ink-soft);max-width:44ch;}
  .project-info .loc{margin-top:16px;font-size:13px;font-weight:700;letter-spacing:.02em;color:var(--stone);}
  .project-info .stat{margin-top:16px;font-size:15px;font-weight:700;color:var(--steel-deep);}

  /* PORQUE IMPORTA */
  .porque{
    position:relative;padding:150px 0;color:var(--cream);
    background:#000 url('../img/fondo-porque.jpg') center/cover no-repeat;
  }
  .porque::before{content:"";position:absolute;inset:0;background:rgba(15,18,22,.78);}
  .porque .wrap{position:relative;z-index:1;display:grid;grid-template-columns:1.2fr 1fr;gap:60px;align-items:start;}
  .porque h2{font-size:clamp(32px,5vw,50px);text-transform:uppercase;}
  .porque h2 .accent{display:block;color:var(--steel);text-transform:none;}
  .porque p{font-size:17px;color:var(--stone);}
  .porque p strong{color:var(--cream);font-weight:700;}
  .porque p + p{margin-top:18px;}

  /* CTA / FOOTER */
  .cta{
    position:relative;padding:150px 0 60px;color:var(--cream);text-align:center;
    background:#000 url('../img/fondo-cta.jpg') center/cover no-repeat;
  }
  .cta .kicker{font-size:15px;color:var(--stone);max-width:52ch;margin:0 auto 22px;}
  .cta::before{content:"";position:absolute;inset:0;background:linear-gradient(180deg, rgba(15,18,22,.6) 0%, rgba(15,18,22,.88) 70%, var(--ink) 100%);}
  .cta .wrap{position:relative;z-index:1;}
  .cta h2{font-size:clamp(34px,6vw,60px);text-transform:uppercase;}
  .cta h2 .accent{display:block;color:var(--steel);text-transform:none;}
  .cta-actions{margin-top:40px;display:flex;gap:16px;justify-content:center;flex-wrap:wrap;}
  .btn{
    display:inline-block;padding:15px 30px;font-size:15px;font-weight:700;text-decoration:none;
  }
  .btn-primary{background:var(--steel);color:var(--ink);}
  .btn-secondary{border:1px solid var(--line-dark);color:var(--cream);}

  footer{background:var(--ink);color:var(--stone);padding:56px 0 30px;}
  footer .wrap{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px;}
  footer .f-brand{color:var(--cream);font-weight:900;font-size:20px;}
  footer p{font-size:14px;line-height:1.7;max-width:36ch;}
  footer h4{color:var(--cream);font-size:13px;letter-spacing:.03em;margin-bottom:14px;font-weight:700;}
  footer ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:10px;}
  footer a{text-decoration:none;font-size:14px;color:var(--stone);}
  footer a:hover{color:var(--cream);}
  .foot-bottom{
    max-width:var(--maxw);margin:50px auto 0;padding:22px 28px 0;border-top:1px solid var(--line-dark);
    display:flex;justify-content:space-between;font-size:12px;color:var(--stone);flex-wrap:wrap;gap:10px;
  }

  @media (max-width:860px){
    nav.links{display:none;}
    .burger{display:block;}
    .somos-grid{grid-template-columns:1fr;gap:30px;}
    .numeros .wrap{grid-template-columns:1fr;gap:26px;}
    .numeros-extra{grid-template-columns:1fr;}
    .industrias-list{grid-template-columns:1fr 1fr;}
    .industrias-head{text-align:left;margin-left:0;}
    .project-row{grid-template-columns:1fr;gap:22px;}
    .project-row .shot img{height:260px;}
    .porque .wrap{grid-template-columns:1fr;gap:30px;}
    footer .wrap{grid-template-columns:1fr;gap:30px;}
  }