/* =====================================================================
   GAIA Integrated Systems Ltd
   "Engineered Elegance" — navy + teal→green, technical-consultancy
   ===================================================================== */

:root {
  /* Palette (from logo) */
  --navy-900: #081726;
  --navy-800: #0c2238;
  --navy-700: #13294b;
  --navy-600: #1c3a5c;
  --teal:     #1e8fa3;
  --teal-br:  #39c0d6;
  --green:    #43a93b;
  --green-br: #5fd157;

  --ink:      #0f1e33;
  --ink-soft: #41566c;
  --muted:    #6b7c8f;
  --line:     #e3e9ef;
  --bg:       #ffffff;
  --bg-soft:  #f5f8fb;
  --bg-tint:  #eef4f8;

  --grad: linear-gradient(125deg, var(--teal) 0%, var(--green) 100%);
  --grad-br: linear-gradient(125deg, var(--teal-br) 0%, var(--green-br) 100%);

  /* Type */
  --font-display: "Sora", system-ui, sans-serif;
  --font-body: "DM Sans", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;

  /* Shape & depth */
  --radius: 16px;
  --radius-lg: 24px;
  --shadow-sm: 0 1px 2px rgba(13, 36, 64, .06), 0 4px 14px rgba(13, 36, 64, .05);
  --shadow-md: 0 10px 30px rgba(13, 36, 64, .10), 0 2px 8px rgba(13, 36, 64, .06);
  --shadow-lg: 0 26px 60px rgba(13, 36, 64, .16);

  --container: 1140px;
  --ease: cubic-bezier(.22, 1, .36, 1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; padding: 0; }
:focus-visible { outline: 2.5px solid var(--teal); outline-offset: 3px; border-radius: 4px; }

.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: 24px; }

.skip-link {
  position: absolute; left: 16px; top: -60px; z-index: 200;
  background: var(--navy-700); color: #fff; padding: 10px 16px; border-radius: 8px;
  transition: top .2s var(--ease);
}
.skip-link:focus { top: 16px; }

/* ---------- Typography helpers ---------- */
.eyebrow {
  font-family: var(--font-mono);
  font-size: .74rem; font-weight: 600;
  letter-spacing: .22em; text-transform: uppercase;
  color: var(--teal-br);
  display: inline-flex; align-items: center; gap: .6em;
}
.eyebrow::before {
  content: ""; width: 26px; height: 2px;
  background: var(--grad-br); border-radius: 2px;
}
.eyebrow-dark { color: var(--teal); }
.eyebrow-dark::before { background: var(--grad); }

.grad-text {
  background: var(--grad); -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}

.section-title {
  font-family: var(--font-display);
  font-weight: 700; letter-spacing: -.02em; line-height: 1.1;
  font-size: clamp(1.9rem, 1rem + 3vw, 3rem);
  color: var(--ink);
}
.section-lead {
  color: var(--ink-soft); font-size: 1.08rem; max-width: 56ch; margin-top: 18px;
}

/* ---------- Buttons ---------- */
.btn {
  --b: 14px 28px;
  display: inline-flex; align-items: center; justify-content: center; gap: .5em;
  font-family: var(--font-display); font-weight: 600; font-size: .98rem;
  padding: var(--b); border-radius: 999px; border: 1px solid transparent;
  cursor: pointer; transition: transform .25s var(--ease), box-shadow .25s var(--ease), background .25s, color .25s, border-color .25s;
  position: relative; white-space: nowrap;
}
.btn-sm { --b: 10px 20px; font-size: .9rem; }
.btn-block { width: 100%; }
.btn-primary {
  background: var(--grad); color: #fff;
  box-shadow: 0 8px 22px rgba(30, 143, 163, .35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 30px rgba(30, 143, 163, .45); }
.btn-ghost {
  background: rgba(255, 255, 255, .04); color: #fff; border-color: rgba(255, 255, 255, .28);
  backdrop-filter: blur(4px);
}
.btn-ghost:hover { border-color: var(--teal-br); color: var(--teal-br); transform: translateY(-2px); }

/* ===================================================================
   HEADER
   =================================================================== */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  padding: 16px 0;
  transition: background .35s var(--ease), box-shadow .35s var(--ease), padding .35s var(--ease);
}
.site-header.scrolled {
  background: rgba(255, 255, 255, .82);
  backdrop-filter: saturate(160%) blur(14px);
  box-shadow: 0 1px 0 var(--line), 0 8px 24px rgba(13, 36, 64, .06);
  padding: 10px 0;
}
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 24px; }

.brand { display: inline-flex; align-items: center; gap: 12px; }
.brand-mark { display: grid; place-items: center; }
.brand-mark svg { display: block; }
.brand-text { display: flex; flex-direction: column; line-height: 1; }
.brand-name {
  font-family: var(--font-display); font-weight: 800; font-size: 1.32rem;
  letter-spacing: .04em; color: #fff; transition: color .35s var(--ease);
}
.brand-sub {
  font-family: var(--font-mono); font-size: .62rem; font-weight: 500;
  letter-spacing: .26em; text-transform: uppercase; color: var(--teal-br);
  margin-top: 4px; transition: color .35s var(--ease);
}
.scrolled .brand-name { color: var(--ink); }
.scrolled .brand-sub { color: var(--teal); }

.nav { display: flex; align-items: center; gap: 8px; }
.nav > a:not(.btn) {
  font-family: var(--font-display); font-weight: 500; font-size: .96rem;
  padding: 8px 14px; border-radius: 8px; color: rgba(255, 255, 255, .82);
  transition: color .25s, background .25s;
}
.nav > a:not(.btn):hover { color: #fff; background: rgba(255, 255, 255, .08); }
.scrolled .nav > a:not(.btn) { color: var(--ink-soft); }
.scrolled .nav > a:not(.btn):hover { color: var(--ink); background: var(--bg-tint); }
.nav-cta { margin-left: 6px; }

.nav-toggle {
  display: none; flex-direction: column; gap: 5px; padding: 10px; background: none;
  border: 0; cursor: pointer; border-radius: 8px;
}
.nav-toggle span {
  width: 24px; height: 2.4px; background: #fff; border-radius: 2px;
  transition: transform .3s var(--ease), opacity .25s, background .35s;
}
.scrolled .nav-toggle span { background: var(--ink); }

/* ===================================================================
   HERO
   =================================================================== */
.hero {
  position: relative; isolation: isolate;
  background: radial-gradient(120% 120% at 50% -10%, var(--navy-700) 0%, var(--navy-900) 70%);
  color: #fff; overflow: hidden;
  padding: clamp(140px, 20vh, 220px) 0 clamp(90px, 12vh, 140px);
}
.hero-bg { position: absolute; inset: 0; z-index: -1; }
.glow {
  position: absolute; border-radius: 50%; filter: blur(90px); opacity: .55;
  animation: drift 16s ease-in-out infinite alternate;
}
.glow-teal { width: 46vw; height: 46vw; left: -8vw; top: -6vw; background: radial-gradient(circle, var(--teal) 0%, transparent 68%); }
.glow-green { width: 42vw; height: 42vw; right: -6vw; bottom: -12vw; background: radial-gradient(circle, var(--green) 0%, transparent 68%); animation-delay: -8s; }
@keyframes drift {
  0%   { transform: translate3d(0, 0, 0) scale(1); }
  100% { transform: translate3d(3vw, 2vw, 0) scale(1.12); }
}

/* circuit-trace texture */
.circuitry {
  position: absolute; inset: 0; opacity: .5;
  background-image:
    linear-gradient(rgba(57, 192, 214, .10) 1px, transparent 1px),
    linear-gradient(90deg, rgba(95, 209, 87, .08) 1px, transparent 1px);
  background-size: 46px 46px, 46px 46px;
  -webkit-mask-image: radial-gradient(110% 90% at 50% 0%, #000 35%, transparent 78%);
          mask-image: radial-gradient(110% 90% at 50% 0%, #000 35%, transparent 78%);
}
.grain {
  position: absolute; inset: 0; pointer-events: none; opacity: .5; mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.5'/%3E%3C/svg%3E");
}

.hero-inner { position: relative; max-width: 880px; }
.hero-title {
  font-family: var(--font-display); font-weight: 800;
  font-size: clamp(2.5rem, 1rem + 6.4vw, 5rem);
  line-height: 1.03; letter-spacing: -.035em; margin: 22px 0 0;
}
.hero-lead {
  margin-top: 26px; max-width: 60ch; font-size: clamp(1.05rem, 1rem + .4vw, 1.25rem);
  color: rgba(233, 240, 247, .82);
}
.hero-actions { margin-top: 38px; display: flex; flex-wrap: wrap; gap: 14px; }
.hero-meta {
  margin-top: 46px; display: flex; flex-wrap: wrap; gap: 14px 28px;
  font-family: var(--font-mono); font-size: .78rem; letter-spacing: .04em;
  color: rgba(233, 240, 247, .65);
}
.hero-meta li { display: flex; align-items: center; gap: .6em; }
.hero-meta li::before {
  content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--grad-br);
  box-shadow: 0 0 12px var(--teal-br);
}

/* curved divider into light body */
.hero::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: -1px; height: 70px; z-index: -1;
  background: var(--bg);
  -webkit-mask: radial-gradient(120% 100% at 50% 100%, #000 99%, transparent 100%);
          mask: radial-gradient(120% 100% at 50% 100%, #000 99%, transparent 100%);
}

/* ===================================================================
   SECTIONS (light)
   =================================================================== */
.section { padding: clamp(72px, 10vh, 120px) 0; }
.section-head { max-width: 680px; margin-bottom: 56px; }
.section-head .section-title { margin-top: 14px; }

.services { background: var(--bg); }

/* Service cards */
.card-grid {
  display: grid; gap: 22px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}
.card {
  position: relative; isolation: isolate; overflow: hidden;
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius-lg);
  padding: 34px 30px 30px; box-shadow: var(--shadow-sm);
  transition: transform .4s var(--ease), box-shadow .4s var(--ease), border-color .4s var(--ease);
}
.card::before {
  content: ""; position: absolute; inset: 0; padding: 1px; border-radius: inherit;
  background: var(--grad); -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude; opacity: 0; transition: opacity .4s var(--ease); z-index: 1;
}
.card::after {
  content: ""; position: absolute; right: -40px; top: -40px; width: 130px; height: 130px;
  background: var(--grad); filter: blur(48px); opacity: 0; transition: opacity .4s var(--ease); z-index: -1;
}
.card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); border-color: transparent; }
.card:hover::before { opacity: 1; }
.card:hover::after { opacity: .22; }

.card-index {
  font-family: var(--font-mono); font-size: .78rem; font-weight: 600;
  letter-spacing: .1em; color: var(--muted);
}
.card-icon {
  display: grid; place-items: center; width: 52px; height: 52px; border-radius: 14px;
  margin: 16px 0 20px; color: var(--teal);
  background: var(--bg-tint); border: 1px solid var(--line);
  transition: color .4s var(--ease), background .4s var(--ease), transform .4s var(--ease);
}
.card:hover .card-icon { color: #fff; background: var(--grad); transform: scale(1.06) rotate(-3deg); border-color: transparent; }
.card-title { font-family: var(--font-display); font-weight: 600; font-size: 1.25rem; letter-spacing: -.01em; }
.card-text { margin-top: 10px; color: var(--ink-soft); font-size: .98rem; }

/* ---------- About ---------- */
.about { background: linear-gradient(180deg, var(--bg) 0%, var(--bg-soft) 100%); }
.about-grid {
  display: grid; gap: clamp(36px, 6vw, 72px); align-items: center;
  grid-template-columns: 1.05fr .95fr;
}
.step-list { margin-top: 34px; display: grid; gap: 20px; }
.step-list li { display: flex; gap: 18px; align-items: flex-start; }
.step-num {
  flex: none; width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center;
  font-family: var(--font-mono); font-weight: 600; font-size: .9rem; color: var(--teal);
  background: var(--bg); border: 1px solid var(--line); box-shadow: var(--shadow-sm);
}
.step-list strong { display: block; font-family: var(--font-display); font-weight: 600; font-size: 1.05rem; color: var(--ink); margin-bottom: 2px; }
.step-list div { color: var(--ink-soft); font-size: .98rem; }

.brand-card {
  position: relative; background: #fff; border: 1px solid var(--line);
  border-radius: var(--radius-lg); padding: 34px; box-shadow: var(--shadow-md);
}
.brand-card::before {
  content: ""; position: absolute; inset: 0; border-radius: inherit; padding: 1.5px;
  background: var(--grad); -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude; opacity: .5;
}
.brand-card img { border-radius: 12px; }
.brand-card figcaption {
  margin-top: 18px; text-align: center; font-family: var(--font-mono);
  font-size: .72rem; letter-spacing: .18em; text-transform: uppercase; color: var(--muted);
}

/* ---------- Why us ---------- */
.why { background: var(--bg-soft); }
.why-grid { display: grid; gap: 24px; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
.why-item {
  background: var(--bg); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px 28px; box-shadow: var(--shadow-sm); transition: transform .35s var(--ease), box-shadow .35s var(--ease);
}
.why-item:hover { transform: translateY(-5px); box-shadow: var(--shadow-md); }
.why-icon {
  display: grid; place-items: center; width: 48px; height: 48px; border-radius: 50%;
  color: #fff; background: var(--grad); box-shadow: 0 8px 18px rgba(30, 143, 163, .3); margin-bottom: 18px;
}
.why-item h3 { font-family: var(--font-display); font-weight: 600; font-size: 1.2rem; }
.why-item p { margin-top: 8px; color: var(--ink-soft); font-size: .98rem; }

/* ===================================================================
   CONTACT (dark)
   =================================================================== */
.contact {
  position: relative; isolation: isolate; overflow: hidden; color: #fff;
  background: radial-gradient(120% 130% at 80% 0%, var(--navy-700) 0%, var(--navy-900) 72%);
}
.contact-bg { position: absolute; inset: 0; z-index: -1; }
.contact .glow { opacity: .4; }
.contact .glow-teal { left: -10vw; top: -10vw; }
.contact .glow-green { right: -10vw; bottom: -14vw; }
.contact-inner {
  display: grid; gap: clamp(36px, 6vw, 64px); align-items: start;
  grid-template-columns: 1fr 1fr;
}
.contact .section-title { color: #fff; }
.contact .section-lead { color: rgba(233, 240, 247, .8); }
.contact-email {
  display: inline-block; margin-top: 26px; font-family: var(--font-display);
  font-weight: 600; font-size: clamp(1.1rem, 1rem + 1vw, 1.5rem);
  color: var(--teal-br); padding-bottom: 4px;
  background: linear-gradient(var(--teal-br), var(--teal-br)) no-repeat left bottom / 0 2px;
  transition: background-size .35s var(--ease);
}
.contact-email:hover { background-size: 100% 2px; }

.contact-form {
  background: rgba(255, 255, 255, .05); border: 1px solid rgba(255, 255, 255, .14);
  border-radius: var(--radius-lg); padding: 32px; backdrop-filter: blur(8px);
  display: grid; gap: 18px;
}
.field { display: grid; gap: 8px; }
.field label {
  font-family: var(--font-mono); font-size: .72rem; letter-spacing: .14em;
  text-transform: uppercase; color: rgba(233, 240, 247, .7);
}
.field input, .field textarea {
  font-family: var(--font-body); font-size: 1rem; color: #fff;
  background: rgba(8, 23, 38, .5); border: 1px solid rgba(255, 255, 255, .16);
  border-radius: 12px; padding: 13px 15px; transition: border-color .25s, box-shadow .25s, background .25s;
  resize: vertical;
}
.field input::placeholder, .field textarea::placeholder { color: rgba(233, 240, 247, .4); }
.field input:focus, .field textarea:focus {
  outline: none; border-color: var(--teal-br); background: rgba(8, 23, 38, .75);
  box-shadow: 0 0 0 3px rgba(57, 192, 214, .2);
}
.form-status { font-size: .9rem; min-height: 1.2em; color: var(--green-br); }
.form-status.error { color: #ff9b9b; }

/* ===================================================================
   FOOTER
   =================================================================== */
.site-footer { background: var(--navy-900); color: rgba(233, 240, 247, .7); padding: 56px 0 36px; }
.footer-inner {
  display: flex; flex-wrap: wrap; gap: 28px; justify-content: space-between; align-items: center;
  padding-bottom: 30px; border-bottom: 1px solid rgba(255, 255, 255, .1);
}
.footer-brand { display: flex; align-items: center; gap: 14px; }
.footer-name { font-family: var(--font-display); font-weight: 700; color: #fff; font-size: 1.1rem; letter-spacing: .01em; }
.footer-tagline { font-size: .9rem; margin-top: 2px; }
.footer-nav { display: flex; flex-wrap: wrap; gap: 6px 18px; }
.footer-nav a { font-family: var(--font-display); font-weight: 500; font-size: .94rem; color: rgba(233, 240, 247, .75); transition: color .25s; }
.footer-nav a:hover { color: var(--teal-br); }
.footer-legal {
  display: flex; flex-wrap: wrap; gap: 6px 24px; justify-content: space-between;
  padding-top: 24px; font-family: var(--font-mono); font-size: .74rem; letter-spacing: .03em;
  color: rgba(233, 240, 247, .5);
}

/* ===================================================================
   MOTION — scroll & load reveals
   =================================================================== */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.is-visible { opacity: 1; transform: none; }
.reveal[data-delay="1"] { transition-delay: .08s; }
.reveal[data-delay="2"] { transition-delay: .16s; }
.reveal[data-delay="3"] { transition-delay: .24s; }
.reveal[data-delay="4"] { transition-delay: .32s; }

/* ===================================================================
   RESPONSIVE
   =================================================================== */
@media (max-width: 860px) {
  .about-grid, .contact-inner { grid-template-columns: 1fr; }
  .brand-card { max-width: 460px; }

  .nav {
    position: fixed; inset: 0 0 auto 0; top: 0; flex-direction: column; align-items: stretch;
    gap: 4px; padding: 96px 24px 28px; background: rgba(255, 255, 255, .97);
    backdrop-filter: blur(16px); box-shadow: var(--shadow-lg);
    transform: translateY(-110%); transition: transform .4s var(--ease); z-index: 90;
  }
  .nav.open { transform: translateY(0); }
  .nav > a:not(.btn) { color: var(--ink-soft); font-size: 1.1rem; padding: 14px 12px; border-bottom: 1px solid var(--line); }
  .nav > a:not(.btn):hover { background: var(--bg-tint); }
  .nav-cta { margin: 14px 0 0; }
  .nav-toggle { display: flex; z-index: 95; }

  /* toggle is over a light overlay once open → dark bars */
  body.nav-open .nav-toggle span { background: var(--ink); }
  body.nav-open .nav-toggle span:nth-child(1) { transform: translateY(7.4px) rotate(45deg); }
  body.nav-open .nav-toggle span:nth-child(2) { opacity: 0; }
  body.nav-open .nav-toggle span:nth-child(3) { transform: translateY(-7.4px) rotate(-45deg); }
}

@media (max-width: 520px) {
  body { font-size: 16px; }
  .container { padding-inline: 18px; }
  .hero-actions .btn { flex: 1 1 auto; }
  .contact-form { padding: 24px; }
}

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