/* =========================================================
   I.S.I — Ingeniería y Soluciones Integrales
   Dirección visual: "Blueprint técnico" — inspirada en el
   propio ícono de circuito del logo.
   ========================================================= */

:root{
  --navy-900:#081F3D;
  --navy-800:#0B2E58;
  --navy-700:#123B6E;
  --navy-600:#1B4B87;
  --blue-500:#0A9CF2;
  --blue-400:#4DB8F7;
  --blue-glow:rgba(10,156,242,.45);
  --steel-500:#77818B;
  --steel-300:#AEB6BE;
  --mist:#F2F5F8;
  --paper:#FFFFFF;
  --line-dark:rgba(255,255,255,.12);
  --line-light:#E2E7EC;

  --font-display:'Sora', sans-serif;
  --font-body:'Inter', sans-serif;
  --font-mono:'JetBrains Mono', monospace;

  --container:1180px;
  --radius:10px;
  --radius-lg:16px;
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;font-family:var(--font-body);color:var(--navy-800);background:var(--paper);
  line-height:1.6;-webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
ul{list-style:none;margin:0;padding:0;}
h1,h2,h3,h4{font-family:var(--font-display);margin:0 0 .5em;color:var(--navy-800);font-weight:700;line-height:1.2;}
p{margin:0 0 1em;}
.container{max-width:var(--container);margin:0 auto;padding:0 24px;}

.code-tag{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:1.2px;text-transform:uppercase;
  color:var(--blue-500);border:1px solid rgba(10,156,242,.35);padding:5px 12px;border-radius:4px;
  margin-bottom:14px;
}
.code-tag::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--blue-500);box-shadow:0 0 8px var(--blue-glow);}
.code-tag--dark{color:var(--navy-700);border-color:rgba(11,46,88,.25);}
.code-tag--dark::before{background:var(--navy-700);box-shadow:none;}

.section{padding:80px 0;}
.section--tight{padding:52px 0;}
.section--mist{background:var(--mist);}
.section--navy{background:var(--navy-900);color:#fff;position:relative;overflow:hidden;}
.section--navy h2,.section--navy h3{color:#fff;}
.section--navy p{color:#B7C6DA;}
.grid-overlay{
  position:absolute;inset:0;opacity:.5;pointer-events:none;
  background-image:linear-gradient(rgba(255,255,255,.045) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255,255,255,.045) 1px, transparent 1px);
  background-size:38px 38px;
}
.center{text-align:center;}

/* Botones */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-family:var(--font-body);font-weight:600;font-size:14px;
  padding:13px 24px;border-radius:8px;border:none;cursor:pointer;
  transition:transform .2s ease, background .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.btn:hover{transform:translateY(-2px);}
.btn:active{transform:scale(.98) translateY(0);}
.btn:focus-visible{outline:2px solid var(--blue-500);outline-offset:2px;}
.btn--primary{background:var(--blue-500);color:#fff;box-shadow:0 0 0 rgba(10,156,242,0);}
.btn--primary:hover{background:#0b8ad9;box-shadow:0 10px 28px var(--blue-glow);}
.btn--outline{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.32);}
.btn--outline:hover{border-color:#fff;background:rgba(255,255,255,.06);}
.btn--outline-navy{background:transparent;color:var(--navy-800);border:1px solid var(--navy-800);}
.btn--outline-navy:hover{background:var(--navy-800);color:#fff;}

/* Progreso de scroll */
.scroll-progress{position:fixed;top:0;left:0;height:3px;background:var(--blue-500);z-index:80;width:0%;box-shadow:0 0 10px var(--blue-glow);}

/* Header */
body{padding-top:78px;}
body.page-home{padding-top:0;}
.site-header{
  position:fixed;top:0;left:0;right:0;width:100%;z-index:50;background:var(--navy-900);border-bottom:1px solid transparent;
  transition:background .35s ease, border-color .35s ease, box-shadow .35s ease;
}
.site-header.has-light-hero{background:transparent;}
.site-header.is-solid{border-bottom:1px solid var(--line-dark);box-shadow:0 4px 24px rgba(0,0,0,.28);}
.site-header.has-light-hero.is-solid{background:rgba(8,31,61,.9);backdrop-filter:blur(10px);}
.site-header .container{display:flex;align-items:center;justify-content:space-between;height:78px;}
.brand{display:flex;align-items:center;gap:10px;}
.brand img{height:30px;width:auto;filter:brightness(0) invert(1);}
.nav{display:flex;align-items:center;gap:32px;}
.nav a{position:relative;font-size:14px;font-weight:500;color:#fff;padding:6px 0;transition:color .3s ease;opacity:.82;}
.nav a::after{content:"";position:absolute;left:0;bottom:0;width:0;height:2px;background:var(--blue-500);transition:width .25s ease;}
.nav a:hover,.nav a.active{opacity:1;}
.nav a:hover::after,.nav a.active::after{width:100%;}
.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:8px;position:relative;z-index:70;}
.nav-toggle span{display:block;width:22px;height:2px;background:#fff;margin:4px 0;transition:transform .3s ease, opacity .3s ease;}
.nav-toggle.is-open span:nth-child(1){transform:translateY(6px) rotate(45deg);}
.nav-toggle.is-open span:nth-child(2){opacity:0;}
.nav-toggle.is-open span:nth-child(3){transform:translateY(-6px) rotate(-45deg);}
.header-phone{
  font-family:var(--font-mono);font-size:13px;color:#fff;opacity:.85;margin-right:20px;
  display:flex;align-items:center;gap:6px;transition:opacity .2s ease;white-space:nowrap;
}
.header-phone:hover{opacity:1;}
@media (max-width:900px){.header-phone{display:none;}}

/* Razones / por qué elegirnos */
.reasons{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:32px;}
.reason-card{position:relative;padding:24px 20px 20px;border-left:2px solid var(--line-light);transition:border-color .3s ease;}
.reason-card:hover{border-color:var(--blue-500);}
.reason-card__num{font-family:var(--font-mono);font-size:12px;color:var(--blue-500);display:block;margin-bottom:10px;}
.reason-card h3{font-size:15px;margin-bottom:6px;}
.reason-card p{font-size:13px;color:var(--steel-500);margin:0;}

/* Bloque de autoridad / certificación destacada */
.authority{
  display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:center;
  background:var(--navy-900);border-radius:var(--radius-lg);padding:44px;position:relative;overflow:hidden;color:#fff;
}
.authority h2,.authority p{color:#fff;}
.authority p{color:#B7C6DA;}
.authority-specs{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-top:20px;position:relative;z-index:2;}
.authority-specs div{border:1px solid var(--line-dark);border-radius:8px;padding:12px 14px;}
.authority-specs b{display:block;font-size:12px;color:var(--blue-400);font-family:var(--font-mono);margin-bottom:4px;text-transform:uppercase;letter-spacing:.4px;}
.authority-specs span{font-size:13px;color:#fff;}
.authority-badge{
  display:inline-flex;align-items:center;gap:8px;background:rgba(10,156,242,.12);border:1px solid rgba(10,156,242,.35);
  color:var(--blue-400);font-family:var(--font-mono);font-size:11px;padding:6px 12px;border-radius:20px;margin-bottom:16px;
}

/* FAQ */
.faq-item{border-bottom:1px solid var(--line-light);}
.faq-question{
  display:flex;align-items:center;justify-content:space-between;gap:16px;padding:20px 4px;cursor:pointer;
  font-family:var(--font-display);font-weight:600;font-size:15px;color:var(--navy-800);
}
.faq-question::after{content:"+";font-size:20px;color:var(--blue-500);transition:transform .25s ease;flex-shrink:0;}
.faq-item.open .faq-question::after{transform:rotate(45deg);}
.faq-answer{max-height:0;overflow:hidden;transition:max-height .35s ease;}
.faq-item.open .faq-answer{max-height:220px;}
.faq-answer p{font-size:13px;color:var(--steel-500);padding:0 4px 20px;margin:0;}

/* Hero */
.hero{
  position:relative;color:#fff;overflow:hidden;background:var(--navy-900);
  padding:96px 0 80px;min-height:82vh;display:flex;align-items:center;
}
.hero__bg{position:absolute;top:-14%;left:0;right:0;height:128%;background-size:cover;background-position:center;opacity:.16;will-change:transform;}
.hero__grid{position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px);
  background-size:42px 42px;
  mask-image:radial-gradient(ellipse 80% 60% at 30% 40%, black 30%, transparent 75%);
}
.hero__content{position:relative;max-width:600px;z-index:2;}
.hero h1{color:#fff;font-size:clamp(30px,4.4vw,48px);margin:18px 0 16px;letter-spacing:-.6px;}
.hero p{color:#9FB4CE;font-size:16px;max-width:500px;margin-bottom:30px;}
.hero__actions{display:flex;gap:12px;flex-wrap:wrap;}
.hero__circuit{width:100%;max-width:640px;height:auto;position:relative;z-index:2;margin-top:34px;}
.hero__circuit path{stroke-dasharray:1200;stroke-dashoffset:1200;animation:drawLine 2.4s ease forwards;}
.hero__circuit .n1{animation:nodePop .4s ease .6s forwards;opacity:0;}
.hero__circuit .n2{animation:nodePop .4s ease 1.1s forwards;opacity:0;}
.hero__circuit .n3{animation:nodePop .4s ease 1.6s forwards;opacity:0;}
.hero__circuit .n4{animation:nodePop .4s ease 2.1s forwards;opacity:0;}
@keyframes drawLine{to{stroke-dashoffset:0;}}
@keyframes nodePop{from{opacity:0;transform:scale(0);}to{opacity:1;transform:scale(1);}}
.hero__scroll{position:absolute;bottom:26px;left:50%;transform:translateX(-50%);z-index:2;display:flex;flex-direction:column;align-items:center;gap:6px;opacity:.65;}
.hero__scroll span{font-family:var(--font-mono);font-size:10px;letter-spacing:1.5px;text-transform:uppercase;color:#9FB4CE;}
.hero__scroll i{width:1px;height:26px;background:rgba(255,255,255,.4);position:relative;overflow:hidden;}
.hero__scroll i::after{content:"";position:absolute;left:0;top:-100%;width:100%;height:100%;background:var(--blue-500);animation:scrollDown 1.8s ease-in-out infinite;}
@keyframes scrollDown{0%{top:-100%;}60%{top:100%;}100%{top:100%;}}

/* Divisor de circuito entre secciones */
.circuit-divider{width:100%;height:56px;display:block;}
.circuit-divider .pulse{animation:blink 2.4s ease-in-out infinite;}
.circuit-divider .pulse-b{animation:blink 2.4s ease-in-out .8s infinite;}
@keyframes blink{0%,100%{opacity:1;}50%{opacity:.25;}}

/* Trust strip / marquee */
.trust{padding:24px 0;background:var(--navy-800);overflow:hidden;position:relative;}
.trust::before,.trust::after{content:"";position:absolute;top:0;bottom:0;width:90px;z-index:2;pointer-events:none;}
.trust::before{left:0;background:linear-gradient(to right, var(--navy-800), transparent);}
.trust::after{right:0;background:linear-gradient(to left, var(--navy-800), transparent);}
.trust__label{font-family:var(--font-mono);font-size:11px;color:#7B93B4;text-transform:uppercase;letter-spacing:1px;text-align:center;margin-bottom:14px;}
.marquee{display:flex;width:max-content;animation:marquee 26s linear infinite;}
.marquee:hover{animation-play-state:paused;}
.trust__brand{font-size:15px;font-weight:700;color:#5C7699;letter-spacing:.4px;padding:0 34px;white-space:nowrap;transition:color .25s ease;}
.trust__brand:hover{color:var(--blue-400);}
@keyframes marquee{from{transform:translateX(0);}to{transform:translateX(-50%);}}

/* Reveal on scroll */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .7s cubic-bezier(.2,.7,.2,1), transform .7s cubic-bezier(.2,.7,.2,1);}
.reveal.in-view{opacity:1;transform:none;}
.reveal-stagger.in-view > *{opacity:1;transform:none;}
.reveal-stagger > *{opacity:0;transform:translateY(24px);transition:opacity .6s ease, transform .6s ease;}
.reveal-stagger.in-view > *:nth-child(1){transition-delay:.05s;}
.reveal-stagger.in-view > *:nth-child(2){transition-delay:.12s;}
.reveal-stagger.in-view > *:nth-child(3){transition-delay:.19s;}
.reveal-stagger.in-view > *:nth-child(4){transition-delay:.26s;}
.reveal-stagger.in-view > *:nth-child(5){transition-delay:.33s;}
.reveal-stagger.in-view > *:nth-child(6){transition-delay:.4s;}

/* Pilares */
.pillars{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:32px;}
.pillar-card{
  position:relative;border:1px solid var(--line-light);border-radius:var(--radius-lg);padding:22px;background:#fff;
  transition:box-shadow .3s ease, transform .3s ease, border-color .3s ease;overflow:hidden;
}
.pillar-card::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:var(--blue-500);transform:scaleX(0);transform-origin:left;transition:transform .35s ease;}
.pillar-card:hover{box-shadow:0 16px 32px rgba(11,46,88,.1);transform:translateY(-4px);border-color:transparent;}
.pillar-card:hover::before{transform:scaleX(1);}
.pillar-card__code{font-family:var(--font-mono);font-size:11px;color:var(--blue-500);letter-spacing:1px;margin-bottom:12px;display:block;}
.pillar-card h3{font-size:16px;margin-bottom:6px;}
.pillar-card p{font-size:13px;color:var(--steel-500);margin-bottom:0;}
.pillar-card a{font-size:12px;font-weight:600;color:var(--navy-700);}

/* Stats */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;text-align:center;position:relative;z-index:2;}
.stat b{display:block;font-family:var(--font-display);font-size:34px;color:#fff;}
.stat span{font-family:var(--font-mono);font-size:11px;color:#7B93B4;text-transform:uppercase;letter-spacing:.6px;}

/* Cards de servicio */
.service-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:28px;}
.service-card{
  position:relative;height:180px;border-radius:var(--radius);overflow:hidden;
  background-size:112%;background-position:center;border:1px solid transparent;
  transition:background-size .55s cubic-bezier(.2,.8,.2,1), box-shadow .3s ease, border-color .3s ease;
}
.service-card:hover{background-size:130%;box-shadow:0 18px 34px rgba(8,31,61,.35);border-color:var(--blue-500);}
.service-card::after{content:"";position:absolute;inset:0;background:linear-gradient(to top, rgba(8,31,61,.94), rgba(8,31,61,.15) 55%);transition:background .35s ease;}
.service-card__code{position:absolute;top:10px;left:10px;z-index:2;font-family:var(--font-mono);font-size:10px;color:var(--blue-400);background:rgba(8,31,61,.55);padding:3px 9px;border-radius:4px;letter-spacing:.6px;}
.service-card__label{position:absolute;left:14px;right:14px;bottom:12px;z-index:2;color:#fff;font-weight:600;font-size:14px;transition:transform .35s ease;}
.service-card:hover .service-card__label{transform:translateY(-2px);}
.service-card__arrow{position:absolute;bottom:12px;right:14px;z-index:2;color:var(--blue-400);font-size:15px;opacity:0;transform:translateX(-6px);transition:opacity .3s ease, transform .3s ease;}
.service-card:hover .service-card__arrow{opacity:1;transform:translateX(0);}

/* Filtros */
.filters{display:flex;gap:8px;flex-wrap:wrap;margin:24px 0 0;}
.filter{font-family:var(--font-mono);font-size:11px;font-weight:500;letter-spacing:.5px;padding:8px 16px;border-radius:20px;background:var(--mist);color:var(--navy-800);cursor:pointer;border:1px solid transparent;text-transform:uppercase;}
.filter.active{background:var(--navy-800);color:#fff;}

/* Detalle de servicio */
.service-hero{position:relative;min-height:320px;background-size:cover;background-position:center;display:flex;align-items:flex-end;background-color:var(--navy-900);}
.service-hero::after{content:"";position:absolute;inset:0;background:linear-gradient(to top, rgba(8,31,61,.96), rgba(8,31,61,.35));}
.service-hero__content{position:relative;z-index:2;padding:32px 0;color:#fff;}
.service-hero__content h1{color:#fff;margin-bottom:0;}

.variant-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:24px 0 36px;}
.variant-card{border:1px solid var(--line-light);border-radius:var(--radius-lg);overflow:hidden;transition:border-color .3s ease, transform .3s ease;}
.variant-card:hover{border-color:var(--blue-500);transform:translateY(-3px);}
.variant-card__img{height:180px;background-size:cover;background-position:center;}
.variant-card__body{padding:18px;}
.variant-card__body h4{font-size:15px;margin-bottom:6px;}
.variant-card__body p{font-size:13px;color:var(--steel-500);margin-bottom:10px;}
.brand-list{font-family:var(--font-mono);font-size:11px;color:var(--steel-300);}

.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:8px 0 36px;}
.gallery img{height:160px;object-fit:cover;border-radius:var(--radius);}

.cta-band{background:var(--navy-800);border-radius:var(--radius-lg);padding:26px 30px;display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;position:relative;overflow:hidden;}
.cta-band p{margin:0;font-weight:600;font-size:15px;color:#fff;position:relative;z-index:2;}

/* Proyectos */
.project-featured{position:relative;border-radius:var(--radius-lg);overflow:hidden;min-height:300px;background-size:106%;background-position:center;display:flex;align-items:flex-end;margin-top:24px;transition:background-size .6s ease;background-color:var(--navy-900);}
.project-featured:hover{background-size:112%;}
.project-featured::after{content:"";position:absolute;inset:0;background:linear-gradient(to top, rgba(8,31,61,.96), rgba(8,31,61,.15));}
.project-featured__content{position:relative;z-index:2;padding:30px;color:#fff;}
.project-featured__badge{position:absolute;top:18px;right:18px;z-index:2;background:var(--blue-500);color:#fff;font-family:var(--font-mono);font-size:11px;font-weight:600;padding:5px 12px;border-radius:4px;letter-spacing:.6px;}
.project-featured__stats{display:flex;gap:22px;margin-top:12px;flex-wrap:wrap;}
.project-featured__stats span{font-size:12px;color:#B7C6DA;}
.project-featured__stats b{font-family:var(--font-display);font-size:15px;color:#fff;}

.project-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:20px;}
.project-card{border:1px solid var(--line-light);border-radius:var(--radius-lg);overflow:hidden;background:#fff;transition:box-shadow .3s ease, transform .3s ease;}
.project-card:hover{box-shadow:0 16px 30px rgba(11,46,88,.12);transform:translateY(-4px);}
.project-card__img{height:160px;background-size:112%;background-position:center;position:relative;transition:background-size .5s ease;background-color:var(--navy-900);}
.project-card:hover .project-card__img{background-size:126%;}
.project-card__img::after{content:"";position:absolute;inset:0;background:linear-gradient(to top, rgba(8,31,61,.88), transparent 60%);}
.project-card__sector{position:relative;z-index:2;color:var(--blue-400);font-family:var(--font-mono);font-size:10px;text-transform:uppercase;padding:12px 12px 0;display:block;letter-spacing:.6px;}
.project-card__body{padding:14px;}
.project-card__body h4{font-size:14px;margin-bottom:4px;}
.project-card__body p{font-size:12px;color:var(--steel-500);margin:0;}

/* Formulario de contacto */
.contact-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;margin-top:24px;}
.form-field{margin-bottom:16px;}
.form-field label{display:block;font-size:13px;font-weight:600;margin-bottom:6px;}
.form-field input,.form-field select,.form-field textarea{
  width:100%;padding:11px 14px;border:1px solid var(--line-light);border-radius:8px;
  font-family:var(--font-body);font-size:14px;background:#fff;transition:border-color .2s ease;
}
.form-field input:focus,.form-field select:focus,.form-field textarea:focus{outline:none;border-color:var(--blue-500);}
.form-field textarea{resize:vertical;min-height:100px;}
.contact-side{background:var(--navy-900);border-radius:var(--radius-lg);padding:28px;color:#fff;position:relative;overflow:hidden;}
.contact-side h3{color:#fff;font-size:16px;position:relative;z-index:2;}
.contact-row{display:flex;gap:12px;align-items:flex-start;margin-bottom:16px;font-size:13px;color:#B7C6DA;position:relative;z-index:2;}
.contact-row b{display:block;color:#fff;}
.whatsapp-btn{display:flex;align-items:center;justify-content:center;gap:8px;background:#25D366;color:#fff;padding:13px;border-radius:8px;font-weight:600;font-size:14px;margin-top:8px;position:relative;z-index:2;}

/* Footer */
.site-footer{background:var(--navy-900);color:#7B93B4;padding:52px 0 24px;position:relative;overflow:hidden;}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:28px;position:relative;z-index:2;}
.footer-grid h4{color:#fff;font-family:var(--font-mono);font-size:12px;text-transform:uppercase;letter-spacing:.8px;margin-bottom:14px;}
.footer-grid a{display:block;font-size:13px;color:#7B93B4;margin-bottom:8px;}
.footer-grid a:hover{color:#fff;}
.footer-logo{display:flex;align-items:center;gap:8px;margin-bottom:10px;}
.footer-logo img{height:24px;filter:brightness(0) invert(1);}
.footer-bottom{border-top:1px solid var(--line-dark);margin-top:36px;padding-top:20px;display:flex;justify-content:space-between;font-size:12px;color:#5C7699;flex-wrap:wrap;gap:10px;position:relative;z-index:2;}

.whatsapp-float{
  position:fixed;bottom:22px;right:22px;background:#25D366;color:#fff;
  width:52px;height:52px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  font-size:24px;box-shadow:0 6px 18px rgba(0,0,0,.3);z-index:60;transition:transform .25s ease;
}
.whatsapp-float:hover{transform:scale(1.08);}
.whatsapp-float::before{content:"";position:absolute;inset:0;border-radius:50%;background:#25D366;animation:pulse 2.4s ease-out infinite;z-index:-1;}
@keyframes pulse{0%{transform:scale(1);opacity:.55;}100%{transform:scale(1.9);opacity:0;}}

/* Lightbox */
.lightbox-gallery img[data-caption]{cursor:zoom-in;transition:opacity .2s ease;}
.lightbox-gallery img[data-caption]:hover{opacity:.85;}
.lightbox-overlay{position:fixed;inset:0;background:rgba(8,31,61,.95);z-index:100;display:none;align-items:center;justify-content:center;padding:24px;}
.lightbox-overlay.is-open{display:flex;}
.lightbox-box{max-width:880px;width:100%;position:relative;}
.lightbox-box img{width:100%;max-height:70vh;object-fit:cover;border-radius:10px;display:block;}
.lightbox-caption{color:#B7C6DA;font-family:var(--font-mono);font-size:12px;margin-top:14px;text-align:center;letter-spacing:.3px;}
.lightbox-close{position:absolute;top:-46px;right:0;color:#fff;font-size:30px;line-height:1;background:none;border:none;cursor:pointer;z-index:2;}
.lightbox-prev,.lightbox-next{position:fixed;top:50%;transform:translateY(-50%);background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.22);color:#fff;width:44px;height:44px;border-radius:50%;font-size:20px;cursor:pointer;display:flex;align-items:center;justify-content:center;z-index:101;}
.lightbox-prev{left:26px;}
.lightbox-next{right:26px;}
.lightbox-prev:hover,.lightbox-next:hover,.lightbox-close:hover{background:rgba(255,255,255,.2);}

/* Tarjetas de caso de proyecto (usadas en fichas de detalle de proyecto) */
.case-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:22px 0 30px;}
.case-stats div{border:1px solid var(--line-light);border-radius:var(--radius);padding:16px;}
.case-stats b{display:block;font-family:var(--font-display);font-size:22px;color:var(--navy-800);}
.case-stats span{font-family:var(--font-mono);font-size:11px;color:var(--steel-500);text-transform:uppercase;letter-spacing:.5px;}
.case-services{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0 30px;}
.case-services a{font-family:var(--font-mono);font-size:11px;color:var(--navy-700);background:var(--mist);border:1px solid var(--line-light);padding:6px 12px;border-radius:4px;transition:background .2s ease, border-color .2s ease;}
.case-services a:hover{background:var(--blue-500);color:#fff;border-color:var(--blue-500);}

/* Responsive */
@media (max-width:900px){
  .pillars,.service-grid{grid-template-columns:repeat(2,1fr);}
  .stats{grid-template-columns:repeat(2,1fr);}
  .project-grid,.gallery{grid-template-columns:repeat(2,1fr);}
  .contact-grid{grid-template-columns:1fr;}
  .footer-grid{grid-template-columns:1fr 1fr;}
  .variant-grid{grid-template-columns:1fr;}
}
@media (max-width:640px){
  .nav{position:fixed;inset:78px 0 0 0;background:var(--navy-900);flex-direction:column;align-items:flex-start;padding:24px;gap:18px;display:none;}
  .nav.open{display:flex;}
  .nav-toggle{display:block;}
  .pillars,.service-grid,.project-grid,.gallery{grid-template-columns:1fr;}
  .stats{grid-template-columns:1fr 1fr;}
  .footer-grid{grid-template-columns:1fr;}
}