/* ==========================================================================
   GKN Networks — stylesheet
   ========================================================================== */

:root{
  --bg: #060b16;
  --bg-alt: #081120;
  --panel: #0c1729;
  --panel-2: #0f1f35;
  --border: rgba(120, 200, 235, 0.14);
  --border-strong: rgba(120, 200, 235, 0.28);
  --cyan: #2fd0f2;
  --cyan-2: #6fe4ff;
  --blue: #3aa0ff;
  --text: #eaf2fa;
  --muted: #93a7c2;
  --muted-2: #6d829e;
  --white: #ffffff;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 20px 60px -20px rgba(0, 0, 0, 0.6);
  --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; }
button{ font: inherit; cursor: pointer; }
h1,h2,h3,h4{ font-family: var(--ff-head); font-weight: 700; margin: 0 0 .5em; letter-spacing: .01em; }
p{ margin: 0 0 1em; color: var(--muted); }
.container{ width: min(1180px, 92%); margin-inline: auto; }

::selection{ background: var(--cyan); color: #04121c; }

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

/* ---------- Background layers ---------- */
.bg-hex{
  position: fixed; inset: 0; z-index: -2;
  background-color: var(--bg);
  background-image:
    linear-gradient(135deg, rgba(47,208,242,.05) 1px, transparent 1px),
    linear-gradient(45deg, rgba(47,208,242,.05) 1px, transparent 1px);
  background-size: 46px 80px;
  background-position: 0 0, 0 0;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, black 40%, transparent 90%);
}
.bg-glow{
  position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background:
    radial-gradient(600px 400px at 15% 10%, rgba(47,208,242,.14), transparent 60%),
    radial-gradient(500px 400px at 85% 30%, rgba(58,160,255,.10), transparent 60%);
}

/* ---------- 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: 64px; height: 64px; border-radius: 50%;
  animation: pulse 1.4s ease-in-out infinite;
  filter: drop-shadow(0 0 18px rgba(47,208,242,.5));
}
@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(--cyan); color: #04121c; padding: .6em 1em; border-radius: 0 0 8px 0;
}
.skip-link:focus{ left: 0; }

/* ---------- Buttons ---------- */
.btn{
  display: inline-flex; align-items: center; justify-content: center; gap: .5em;
  padding: .85em 1.6em;
  border-radius: 999px;
  font-weight: 600;
  font-size: .95rem;
  border: 1px solid transparent;
  transition: transform .25s ease, box-shadow .25s ease, background .25s ease, color .25s ease, border-color .25s ease;
  white-space: nowrap;
}
.btn-primary{
  background: linear-gradient(135deg, var(--cyan), var(--blue));
  color: #03121c;
  box-shadow: 0 8px 30px -8px rgba(47,208,242,.55);
}
.btn-primary:hover{ transform: translateY(-2px); box-shadow: 0 12px 34px -6px rgba(47,208,242,.7); }
.btn-ghost{
  background: rgba(255,255,255,.02);
  color: var(--text);
  border-color: var(--border-strong);
}
.btn-ghost:hover{ border-color: var(--cyan); color: var(--cyan-2); transform: translateY(-2px); }
.btn-sm{ padding: .6em 1.3em; font-size: .85rem; }
.btn-lg{ padding: 1em 2.2em; font-size: 1.05rem; }
.btn-block{ width: 100%; }

/* ---------- 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(6, 11, 22, .78);
  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%; }
.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(--cyan-2); font-weight: 700; }
.brand-text em{ font-style: normal; font-size: .48em; color: var(--muted); 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: linear-gradient(90deg, var(--cyan), var(--blue));
  transition: width .3s ease;
}
.nav-link:hover, .nav-link.active{ color: var(--text); }
.nav-link:hover::after, .nav-link.active::after{ width: 100%; }

.header-actions{ display: flex; align-items: center; gap: 1rem; }

.nav-toggle{
  display: none; flex-direction: column; gap: 5px;
  width: 40px; height: 40px; align-items: center; justify-content: center;
  background: transparent; border: 1px solid var(--border-strong); border-radius: 10px;
}
.nav-toggle span{ width: 18px; height: 2px; background: var(--text); transition: transform .3s ease, opacity .3s ease; }
.nav-toggle[aria-expanded="true"] span:nth-child(1){ transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2){ opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3){ transform: translateY(-7px) rotate(-45deg); }

/* ---------- Eyebrow / section head ---------- */
.eyebrow{
  display: inline-flex; align-items: center; gap: .5em;
  font-size: .8rem; letter-spacing: .18em; text-transform: uppercase;
  color: var(--cyan-2); font-weight: 600; margin-bottom: .9em;
}
.eyebrow .dot{ width: 7px; height: 7px; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 12px 2px rgba(47,208,242,.8); }

.section-head{ max-width: 680px; margin-bottom: 3rem; }
.section-head h2{ font-size: clamp(1.7rem, 3.2vw, 2.4rem); }
.section-desc{ font-size: 1.02rem; }

/* ---------- Hero ---------- */
.hero{
  position: relative;
  min-height: 100svh;
  display: flex; align-items: center;
  padding-top: var(--header-h);
  overflow: hidden;
}
.hero-canvas{ position: absolute; inset: 0; width: 100%; height: 100%; z-index: -1; opacity: .8; }
.hero-inner{ position: relative; padding-block: 4rem 3rem; }
.hero-title{
  font-size: clamp(2.2rem, 5.6vw, 4.2rem);
  line-height: 1.08;
  max-width: 16ch;
  margin-bottom: .5em;
}
.text-grad{
  background: linear-gradient(100deg, var(--cyan) 10%, var(--cyan-2) 40%, var(--blue) 80%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero-sub{ font-size: 1.12rem; max-width: 56ch; margin-bottom: 2em; }
.hero-cta{ display: flex; flex-wrap: wrap; gap: 1rem; margin-bottom: 2.6rem; }
.hero-tags{ display: flex; flex-wrap: wrap; gap: .7rem; }
.hero-tags span{
  font-size: .78rem; letter-spacing: .06em; text-transform: uppercase;
  padding: .5em 1em; border: 1px solid var(--border-strong); border-radius: 999px;
  color: var(--muted); background: rgba(15,31,53,.4);
}

.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(--cyan);
  animation: scrollcue 1.8s ease infinite;
}
@keyframes scrollcue{
  0%{ opacity: 1; top: 6px; }
  70%{ opacity: 0; top: 22px; }
  100%{ opacity: 0; top: 6px; }
}

/* ---------- Marquee ---------- */
.marquee{
  border-block: 1px solid var(--border);
  background: var(--panel);
  overflow: hidden;
  padding-block: .9rem;
}
.marquee-track{
  display: flex; width: max-content; gap: .8rem;
  animation: marquee 26s linear infinite;
  font-family: var(--ff-head);
  font-size: .8rem; letter-spacing: .12em; text-transform: uppercase; color: var(--muted-2);
}
.marquee-track span:nth-child(2n){ color: var(--cyan); }
@keyframes marquee{
  from{ transform: translateX(0); }
  to{ transform: translateX(-50%); }
}

/* ---------- 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); }

/* ---------- Cards / grid ---------- */
.grid{ display: grid; gap: 1.5rem; }
.services-grid{ grid-template-columns: repeat(3, 1fr); }
.sectors-grid{ grid-template-columns: repeat(4, 1fr); }

.card{
  background: linear-gradient(180deg, var(--panel), var(--panel-2));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: transform .35s ease, border-color .35s ease, box-shadow .35s ease;
}
.card:hover{ transform: translateY(-6px); border-color: var(--border-strong); box-shadow: var(--shadow); }

.card-icon{
  width: 54px; height: 54px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  background: rgba(47,208,242,.08); color: var(--cyan);
  margin-bottom: 1.2rem;
}
.card-icon svg{ width: 26px; height: 26px; }
.service-card h3{ font-size: 1.15rem; }
.service-card p{ font-size: .95rem; }
.card-link{
  display: inline-flex; align-items: center; gap: .4em;
  font-size: .88rem; font-weight: 600; color: var(--cyan-2);
  margin-top: .4rem;
}
.card-link span{ transition: transform .25s ease; }
.card-link:hover span{ transform: translateX(4px); }

/* ---------- About ---------- */
.about-grid{ display: grid; grid-template-columns: 1.1fr .9fr; gap: 3rem; align-items: center; margin-bottom: 4.5rem; }
.about-copy h2{ font-size: clamp(1.7rem, 3vw, 2.3rem); }
.check-list{ margin: 1.5rem 0 2rem; display: flex; flex-direction: column; gap: .8rem; }
.check-list li{
  position: relative; padding-left: 1.8em; color: var(--text); font-size: .96rem;
}
.check-list li::before{
  content: "✓"; position: absolute; left: 0; top: -1px;
  width: 22px; height: 22px; border-radius: 50%;
  background: rgba(47,208,242,.12); color: var(--cyan);
  display: flex; align-items: center; justify-content: center;
  font-size: .7rem; font-weight: 700;
}

.about-visual{ display: flex; justify-content: center; }
.hex-frame{
  position: relative; width: min(360px, 80vw); aspect-ratio: 1;
  clip-path: polygon(25% 6%, 75% 6%, 100% 50%, 75% 94%, 25% 94%, 0% 50%);
  background: radial-gradient(circle at 50% 45%, rgba(47,208,242,.18), transparent 70%), var(--panel);
  border: 1px solid var(--border-strong);
  display: flex; align-items: center; justify-content: center;
  animation: floaty 6s ease-in-out infinite;
}
.hex-image{ width: 62%; border-radius: 50%; filter: drop-shadow(0 0 24px rgba(47,208,242,.35)); }
@keyframes floaty{
  0%,100%{ transform: translateY(0); }
  50%{ transform: translateY(-14px); }
}

/* ---------- Stats ---------- */
.stats-grid{
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem;
  border-top: 1px solid var(--border); padding-top: 3rem;
}
.stat{ text-align: left; }
.stat-num{
  display: block; font-family: var(--ff-head); font-size: clamp(2rem, 4vw, 2.8rem);
  background: linear-gradient(100deg, var(--cyan), var(--blue));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.stat-label{ font-size: .88rem; color: var(--muted); }

/* ---------- Process ---------- */
.process-grid{ display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }
.process-step{
  position: relative; padding: 2rem 1.6rem 1.6rem; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--panel);
}
.process-step::after{
  content: ""; position: absolute; top: 2rem; right: -1.5rem; width: 1.5rem; height: 1px;
  background: linear-gradient(90deg, var(--border-strong), transparent);
  display: none;
}
.process-num{
  display: inline-block; font-family: var(--ff-head); font-size: 1.6rem; color: var(--cyan);
  opacity: .85; margin-bottom: .6rem;
}
.process-step h3{ font-size: 1.05rem; }
.process-step p{ font-size: .92rem; margin: 0; }

/* ---------- Sectors ---------- */
.sector-card{
  padding: 1.8rem; border: 1px solid var(--border); border-radius: var(--radius);
  background: linear-gradient(180deg, var(--panel), transparent);
  transition: border-color .3s ease, transform .3s ease;
}
.sector-card:hover{ border-color: var(--border-strong); transform: translateY(-4px); }
.sector-card h3{ font-size: 1.05rem; color: var(--cyan-2); }
.sector-card p{ font-size: .9rem; margin: 0; }

/* ---------- FAQ ---------- */
.faq-grid{ display: grid; grid-template-columns: .85fr 1.15fr; gap: 3rem; align-items: start; }
.faq-head{ margin-bottom: 0; position: sticky; top: calc(var(--header-h) + 20px); }

.acc-item{ border-bottom: 1px solid var(--border); }
.acc-trigger{
  width: 100%; display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  background: transparent; border: none; color: var(--text);
  padding: 1.3rem 0; text-align: left; font-size: 1rem; font-weight: 600;
}
.acc-icon{
  position: relative; width: 20px; height: 20px; flex: none;
}
.acc-icon::before, .acc-icon::after{
  content: ""; position: absolute; top: 50%; left: 50%; background: var(--cyan);
  transform: translate(-50%,-50%);
}
.acc-icon::before{ width: 12px; height: 2px; }
.acc-icon::after{ width: 2px; height: 12px; transition: transform .3s ease; }
.acc-item.is-open .acc-icon::after{ transform: translate(-50%,-50%) rotate(90deg); opacity: 0; }

.acc-panel{
  max-height: 0; overflow: hidden; transition: max-height .4s ease, padding .4s ease;
}
.acc-panel p{ padding-bottom: 1.3rem; margin: 0; font-size: .95rem; }
.acc-item.is-open .acc-panel{ max-height: 220px; }

/* ---------- CTA banner ---------- */
.cta-banner{
  margin: 0 auto; width: min(1180px, 92%);
  border-radius: 24px;
  background:
    radial-gradient(600px 300px at 20% 0%, rgba(47,208,242,.25), transparent 60%),
    linear-gradient(135deg, #0c2437, #08131f);
  border: 1px solid var(--border-strong);
  padding: clamp(2.5rem, 5vw, 4rem);
  text-align: center;
}
.cta-inner h2{ font-size: clamp(1.6rem, 3.4vw, 2.3rem); max-width: 20ch; margin-inline: auto .4em; }
.cta-inner p{ max-width: 52ch; margin-inline: auto 1.6em; }

/* ---------- Contact ---------- */
.contact-grid{ display: grid; grid-template-columns: .8fr 1.2fr; gap: 3rem; }
.contact-list{ display: flex; flex-direction: column; gap: 1.3rem; margin-top: 2rem; }
.contact-list li{ display: flex; align-items: center; gap: 1rem; }
.contact-ic{
  width: 44px; height: 44px; border-radius: 12px; flex: none;
  display: flex; align-items: center; justify-content: center;
  background: rgba(47,208,242,.1); color: var(--cyan); font-size: 1.1rem;
}
.contact-list strong{ display: block; font-size: .82rem; color: var(--muted-2); font-weight: 600; }
.contact-list a, .contact-list span{ font-size: .98rem; color: var(--text); }
.contact-list a:hover{ color: var(--cyan-2); }

.contact-form{
  background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius);
  padding: clamp(1.6rem, 3vw, 2.4rem);
}
.form-row{ display: grid; grid-template-columns: 1fr 1fr; gap: 1.2rem; }
.field{ margin-bottom: 1.2rem; display: flex; flex-direction: column; gap: .45rem; }
.field label{ font-size: .82rem; color: var(--muted); font-weight: 600; }
.field input, .field select, .field textarea{
  background: var(--bg-alt); border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  padding: .8em .9em; color: var(--text); font-family: var(--ff-body); font-size: .95rem;
  transition: border-color .25s ease, box-shadow .25s ease;
}
.field input:focus, .field select:focus, .field textarea:focus{
  outline: none; border-color: var(--cyan); box-shadow: 0 0 0 3px rgba(47,208,242,.15);
}
.field textarea{ resize: vertical; min-height: 100px; }
.field.has-error input, .field.has-error textarea{ border-color: #ff6b6b; }
.field-error{ font-size: .78rem; color: #ff8080; min-height: 1em; }
.form-note{ margin: .9rem 0 0; font-size: .9rem; text-align: center; min-height: 1.4em; color: var(--cyan-2); }

/* ---------- Footer ---------- */
.site-footer{ border-top: 1px solid var(--border); background: var(--bg-alt); padding-top: 3.5rem; }
.footer-inner{ display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 2rem; padding-bottom: 2.5rem; }
.footer-brand p{ font-size: .88rem; margin-top: .8rem; max-width: 34ch; }
.footer-brand .brand-text{ margin-top: .8rem; }
.footer-col h4{ font-size: .9rem; letter-spacing: .06em; text-transform: uppercase; color: var(--text); margin-bottom: 1rem; }
.footer-col ul{ display: flex; flex-direction: column; gap: .7rem; }
.footer-col a{ font-size: .9rem; color: var(--muted); transition: color .2s ease; }
.footer-col a:hover{ color: var(--cyan-2); }
.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: linear-gradient(135deg, var(--cyan), var(--blue)); color: #04121c;
  font-weight: 700; box-shadow: 0 10px 30px -8px rgba(47,208,242,.6);
  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: 1024px){
  .services-grid{ grid-template-columns: repeat(2, 1fr); }
  .sectors-grid{ grid-template-columns: repeat(2, 1fr); }
  .process-grid{ grid-template-columns: repeat(2, 1fr); }
  .stats-grid{ grid-template-columns: repeat(2, 1fr); row-gap: 2rem; }
  .about-grid{ grid-template-columns: 1fr; }
  .about-visual{ order: -1; }
  .faq-grid{ grid-template-columns: 1fr; }
  .faq-head{ position: static; }
  .contact-grid{ grid-template-columns: 1fr; }
  .footer-inner{ grid-template-columns: 1fr 1fr; }
}

@media (max-width: 780px){
  .main-nav{
    position: fixed; inset: 68px 0 0 0; z-index: 999;
    background: rgba(6,11,22,.98); backdrop-filter: blur(10px);
    transform: translateY(-12px); opacity: 0; visibility: hidden; pointer-events: none;
    transition: opacity .3s ease, transform .3s ease, visibility .3s ease;
    padding: 1rem 0;
    overflow-y: auto;
  }
  .main-nav.is-open{ transform: translateY(0); opacity: 1; visibility: visible; pointer-events: auto; }
  .main-nav ul{ flex-direction: column; align-items: flex-start; gap: 0; padding: 0 6%; }
  .main-nav li{ width: 100%; border-bottom: 1px solid var(--border); }
  .nav-link{ display: block; padding: 1rem 0; font-size: 1.05rem; }
  .header-actions .btn-sm{ display: none; }
  .nav-toggle{ display: flex; }

  .services-grid, .sectors-grid, .process-grid, .stats-grid{ grid-template-columns: 1fr; }
  .form-row{ grid-template-columns: 1fr; }
  .footer-inner{ grid-template-columns: 1fr; text-align: left; }
  .hero-inner{ padding-block: 3rem 2.5rem; }
}

@media (max-width: 460px){
  .hero-cta{ flex-direction: column; align-items: stretch; }
  .btn{ width: 100%; }
  .hero-tags{ gap: .5rem; }
  .cta-banner{ border-radius: 18px; }
}