/* ==========================================================================
   GKN Networks SL — página corporativa neutra (portal de divisiones)
   ========================================================================== */

:root{
  --bg: #f6f6f7;
  --bg-alt: #eef0f2;
  --panel: #ffffff;
  --border: rgba(23, 26, 31, 0.10);
  --border-strong: rgba(23, 26, 31, 0.20);
  --ink: #14171c;
  --text: #23262c;
  --muted: #5b6270;
  --muted-2: #868e9c;
  --white: #ffffff;

  --ia-1: #2fd0f2;
  --ia-2: #3aa0ff;
  --obra-1: #d98f4e;
  --obra-2: #b5691f;

  --radius: 18px;
  --radius-sm: 10px;
  --shadow: 0 24px 60px -26px rgba(20, 23, 28, 0.28);
  --ff-head: "Orbitron", "Inter", sans-serif;
  --ff-body: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --header-h: 76px;
}

*, *::before, *::after{ box-sizing: border-box; }
html{ scroll-behavior: smooth; scroll-padding-top: var(--header-h); }
body{
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--ff-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
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(--ff-head); font-weight: 700; margin: 0 0 .5em; letter-spacing: .01em; color: var(--ink); }
p{ margin: 0 0 1em; color: var(--muted); }
.container{ width: min(1100px, 92%); margin-inline: auto; }

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

@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  *{ animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
}

/* ---------- Background ---------- */
.bg-grid{
  position: fixed; inset: 0; z-index: -1;
  background-color: var(--bg);
  background-image:
    linear-gradient(rgba(23,26,31,.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23,26,31,.045) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(ellipse 80% 50% at 50% 0%, black 30%, transparent 85%);
}

/* ---------- Loader ---------- */
.loader{
  position: fixed; inset: 0; z-index: 9999;
  background: var(--bg);
  display: flex; align-items: center; justify-content: center;
  transition: opacity .6s ease, visibility .6s ease;
}
.loader.is-hidden{ opacity: 0; visibility: hidden; }
.loader-icon{
  width: 60px; height: 60px; border-radius: 50%;
  animation: pulse 1.4s ease-in-out infinite;
  filter: drop-shadow(0 0 16px rgba(20,23,28,.2));
}
@keyframes pulse{
  0%,100%{ transform: scale(.9); opacity: .7; }
  50%{ transform: scale(1.05); opacity: 1; }
}

.skip-link{
  position: absolute; left: -999px; top: 0; z-index: 10000;
  background: var(--ink); color: #fff; padding: .6em 1em; border-radius: 0 0 8px 0;
}
.skip-link:focus{ left: 0; }

/* ---------- Header ---------- */
.site-header{
  position: fixed; inset-inline: 0; top: 0; z-index: 1000;
  height: var(--header-h);
  display: flex; align-items: center;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background .35s ease, border-color .35s ease, height .3s ease, backdrop-filter .35s ease;
}
.site-header.is-scrolled{
  background: rgba(246, 246, 247, .85);
  backdrop-filter: blur(14px) saturate(140%);
  border-bottom-color: var(--border);
  height: 68px;
}
.header-inner{ display: flex; align-items: center; justify-content: space-between; gap: 1rem; }

.brand{ display: flex; align-items: center; gap: .6rem; }
.brand-icon{ width: 38px; height: 38px; border-radius: 50%; box-shadow: 0 0 0 2px var(--panel), 0 2px 10px -2px rgba(20,23,28,.25); }
.brand-text{ font-family: var(--ff-head); font-size: 1.15rem; letter-spacing: .06em; line-height: 1; display: flex; flex-direction: column; }
.brand-text strong{ color: var(--ink); font-weight: 700; }
.brand-text em{ font-style: normal; font-size: .48em; color: var(--muted-2); letter-spacing: .3em; margin-top: .35em; }

.main-nav ul{ display: flex; align-items: center; gap: 2rem; }
.nav-link{
  position: relative; font-size: .92rem; font-weight: 500; color: var(--muted);
  padding: .3em 0; transition: color .25s ease;
}
.nav-link::after{
  content: ""; position: absolute; left: 0; bottom: -4px; height: 2px; width: 0;
  background: var(--ink);
  transition: width .3s ease;
}
.nav-link:hover{ color: var(--ink); }
.nav-link:hover::after{ width: 100%; }

/* ---------- Eyebrow / section head ---------- */
.eyebrow{
  display: inline-flex; align-items: center; gap: .5em;
  font-size: .8rem; letter-spacing: .18em; text-transform: uppercase;
  color: var(--muted); font-weight: 600; margin-bottom: .9em;
}
.eyebrow .dot{ width: 7px; height: 7px; border-radius: 50%; background: linear-gradient(135deg, var(--ia-1), var(--obra-2)); }

.section-head{ max-width: 680px; margin-bottom: 3.5rem; }
.section-head.center{ max-width: 620px; margin-inline: auto; text-align: center; }
.section-head h2{ font-size: clamp(1.7rem, 3.2vw, 2.4rem); }
.section-desc{ font-size: 1.02rem; }

/* ---------- Hero ---------- */
.hero{
  position: relative;
  min-height: 86svh;
  display: flex; align-items: center; justify-content: center;
  padding-top: var(--header-h);
  text-align: center;
}
.hero-inner{ padding-block: 3rem; max-width: 900px; }
.hero-title{
  font-size: clamp(2rem, 4.6vw, 3.2rem);
  line-height: 1.18;
  margin-bottom: .6em;
}
.hero-sub{ font-size: 1.12rem; max-width: 62ch; margin-inline: auto; }

.scroll-cue{
  position: absolute; bottom: 28px; left: 50%; transform: translateX(-50%);
  width: 26px; height: 42px; border: 2px solid var(--border-strong); border-radius: 20px;
}
.scroll-cue span{
  position: absolute; top: 6px; left: 50%; transform: translateX(-50%);
  width: 4px; height: 8px; border-radius: 2px; background: var(--ink);
  animation: scrollcue 1.8s ease infinite;
}
@keyframes scrollcue{
  0%{ opacity: 1; top: 6px; }
  70%{ opacity: 0; top: 22px; }
  100%{ opacity: 0; top: 6px; }
}

/* ---------- Sections ---------- */
.section{ padding-block: clamp(4rem, 7vw, 7rem); }
.section-alt{ background: linear-gradient(180deg, var(--bg-alt), var(--bg)); border-block: 1px solid var(--border); }

/* ---------- Division cards ---------- */
.division-grid{ display: grid; grid-template-columns: 1fr 1fr; gap: 2rem; }

.division-card{
  position: relative;
  display: flex; flex-direction: column;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 2.6rem 2.4rem;
  overflow: hidden;
  transition: transform .4s ease, border-color .4s ease, box-shadow .4s ease;
}
.division-card::before{
  content: "";
  position: absolute; inset: 0;
  opacity: 0;
  transition: opacity .4s ease;
  z-index: 0;
}
.division-ia::before{ background: radial-gradient(480px 260px at 90% -10%, rgba(47,208,242,.14), transparent 65%); }
.division-obra::before{ background: radial-gradient(480px 260px at 90% -10%, rgba(181,105,31,.14), transparent 65%); }

.division-card:hover{ transform: translateY(-8px); border-color: var(--border-strong); box-shadow: var(--shadow); }
.division-card:hover::before{ opacity: 1; }

.division-card > *{ position: relative; z-index: 1; }

.division-tag{
  display: inline-block; align-self: flex-start;
  font-size: .74rem; font-weight: 700; letter-spacing: .1em; text-transform: uppercase;
  padding: .4em .9em; border-radius: 999px; margin-bottom: 1.6rem;
  color: var(--muted); background: var(--bg-alt);
  transition: color .35s ease, background .35s ease;
}
.division-ia:hover .division-tag{ color: #0d7c94; background: rgba(47,208,242,.14); }
.division-obra:hover .division-tag{ color: #8a4f15; background: rgba(181,105,31,.14); }

.division-icon{
  width: 58px; height: 58px; border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  background: var(--bg-alt); color: var(--ink);
  margin-bottom: 1.4rem;
  transition: background .35s ease, color .35s ease;
}
.division-icon svg{ width: 28px; height: 28px; }
.division-ia:hover .division-icon{ background: linear-gradient(135deg, var(--ia-1), var(--ia-2)); color: #fff; }
.division-obra:hover .division-icon{ background: linear-gradient(135deg, var(--obra-1), var(--obra-2)); color: #fff; }

.division-card h3{ font-size: 1.5rem; margin-bottom: .5rem; }
.division-card p{ font-size: .98rem; margin-bottom: 1.4rem; }

.division-tags{ display: flex; flex-wrap: wrap; gap: .5rem; margin-bottom: 2rem; }
.division-tags span{
  font-size: .76rem; font-weight: 600; color: var(--muted);
  border: 1px solid var(--border-strong); border-radius: 999px; padding: .35em .85em;
}

.division-cta{
  margin-top: auto;
  display: inline-flex; align-items: center; gap: .5em;
  font-weight: 700; font-size: .98rem; color: var(--ink);
}
.division-cta span{ transition: transform .3s ease; }
.division-card:hover .division-cta span{ transform: translateX(6px); }
.division-ia:hover .division-cta{ color: #0d7c94; }
.division-obra:hover .division-cta{ color: #8a4f15; }

/* ---------- Values ---------- */
.values-grid{ display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
.value-card{
  padding: 2rem 1.6rem; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--panel); text-align: left;
  transition: transform .3s ease, border-color .3s ease;
}
.value-card:hover{ transform: translateY(-4px); border-color: var(--border-strong); }
.value-icon{
  width: 46px; height: 46px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  background: var(--bg-alt); color: var(--ink); margin-bottom: 1rem;
}
.value-icon svg{ width: 22px; height: 22px; }
.value-card h3{ font-size: 1.05rem; }
.value-card p{ font-size: .9rem; margin: 0; }

/* ---------- Contact ---------- */
.contact-panel{
  display: grid; grid-template-columns: 1.1fr .9fr; gap: 2.5rem; align-items: center;
  background: var(--panel); border: 1px solid var(--border); border-radius: 24px;
  padding: clamp(2.2rem, 4vw, 3.2rem);
  box-shadow: var(--shadow);
}
.contact-list{ display: flex; flex-direction: column; gap: 1.3rem; }
.contact-list li{ display: flex; align-items: center; gap: 1rem; }
.contact-ic{
  width: 46px; height: 46px; border-radius: 12px; flex: none;
  display: flex; align-items: center; justify-content: center;
  background: var(--bg-alt); color: var(--ink); font-size: 1.1rem;
}
.contact-list strong{ display: block; font-size: .8rem; color: var(--muted-2); font-weight: 600; }
.contact-list a{ font-size: 1.02rem; color: var(--ink); font-weight: 600; }
.contact-list a:hover{ text-decoration: underline; }

/* ---------- Footer ---------- */
.site-footer{ border-top: 1px solid var(--border); background: var(--bg-alt); padding-top: 2.6rem; }
.footer-inner{ display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 1.5rem; padding-bottom: 2.2rem; }
.footer-links{ display: flex; flex-wrap: wrap; gap: 1.8rem; }
.footer-links a{ font-size: .9rem; color: var(--muted); transition: color .2s ease; }
.footer-links a:hover{ color: var(--ink); }
.footer-bottom{
  border-top: 1px solid var(--border); padding-block: 1.4rem;
  text-align: center; font-size: .82rem; color: var(--muted-2);
}

/* ---------- Back to top ---------- */
.back-to-top{
  position: fixed; right: 22px; bottom: 22px; z-index: 900;
  width: 46px; height: 46px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: var(--ink); color: #fff;
  font-weight: 700; box-shadow: 0 10px 28px -8px rgba(20,23,28,.5);
  opacity: 0; visibility: hidden; transform: translateY(10px);
  transition: opacity .3s ease, transform .3s ease, visibility .3s ease;
}
.back-to-top.is-visible{ opacity: 1; visibility: visible; transform: translateY(0); }

/* ---------- Reveal on scroll ---------- */
.reveal{ opacity: 0; transform: translateY(24px); transition: opacity .7s ease, transform .7s ease; }
.reveal.is-visible{ opacity: 1; transform: translateY(0); }

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 900px){
  .division-grid{ grid-template-columns: 1fr; }
  .values-grid{ grid-template-columns: repeat(2, 1fr); }
  .contact-panel{ grid-template-columns: 1fr; text-align: left; }
}

@media (max-width: 700px){
  .main-nav ul{ gap: 1.2rem; }
  .nav-link{ font-size: .82rem; }
  .division-card{ padding: 2rem 1.6rem; }
}

@media (max-width: 520px){
  .values-grid{ grid-template-columns: 1fr; }
  .footer-inner{ flex-direction: column; align-items: flex-start; }

  .header-inner{ gap: .5rem; }
  .brand-text{ font-size: 1rem; }
  .main-nav{ overflow-x: auto; scrollbar-width: none; -ms-overflow-style: none; }
  .main-nav::-webkit-scrollbar{ display: none; }
  .main-nav ul{ gap: .9rem; flex-wrap: nowrap; }
  .nav-link{ font-size: .74rem; white-space: nowrap; }
}