/* =========================================================
   Gupta Technology LLC — Corporate Website
   Design system: deep navy / charcoal / white with electric
   blue + violet accents. Product themes (SocialX360, FrndTalk)
   layer their own accent colors on top of the same structure.
   ========================================================= */

:root {
  /* Core corporate palette */
  --navy-900: #060b1a;
  --navy-800: #0a1128;
  --navy-700: #0f1a38;
  --charcoal: #1b1f27;
  --white: #ffffff;
  --off-white: #f5f7fb;
  --gray-100: #eef1f7;
  --gray-300: #c7ccda;
  --gray-500: #8891a6;
  --gray-700: #4d5468;

  /* Corporate accents */
  --electric-blue: #3b6fed;
  --electric-blue-light: #6d93ff;
  --violet: #7c3aed;
  --violet-light: #a575f5;

  /* SocialX360 accents */
  --sx-teal: #0d9488;
  --sx-cyan: #06b6d4;
  --sx-amber: #f59e0b;

  /* FrndTalk accents (spec-mandated) */
  --ft-blue: #1e5fe0;
  --ft-violet: #7c3aed;

  /* Semantic */
  --bg: var(--navy-900);
  --surface: var(--navy-800);
  --surface-raised: var(--navy-700);
  --text-primary: var(--white);
  --text-secondary: var(--gray-300);
  --text-muted: var(--gray-500);
  --accent: var(--electric-blue);
  --accent-2: var(--violet);

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;

  --shadow-soft: 0 10px 40px -12px rgba(0, 0, 0, 0.45);
  --shadow-glow: 0 0 60px -15px rgba(59, 111, 237, 0.35);

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-fast: 180ms;
  --dur-med: 420ms;
  --dur-slow: 800ms;

  --container-max: 1240px;
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img, svg { max-width: 100%; display: block; }

a { color: inherit; text-decoration: none; }

h1, h2, h3, h4 {
  font-weight: 700;
  line-height: 1.15;
  margin: 0 0 0.5em;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.4rem, 5vw, 4rem); }
h2 { font-size: clamp(1.9rem, 3.6vw, 2.8rem); }
h3 { font-size: 1.4rem; }
h4 { font-size: 1.1rem; }

p { color: var(--text-secondary); margin: 0 0 1em; }

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

section { position: relative; padding: 96px 0; }
section.tight { padding: 64px 0; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--electric-blue-light);
  margin-bottom: 16px;
}

.eyebrow::before {
  content: "";
  width: 20px;
  height: 2px;
  background: linear-gradient(90deg, var(--electric-blue), var(--violet));
  border-radius: 2px;
}

.section-head {
  max-width: 680px;
  margin: 0 auto 56px;
  text-align: center;
}
.section-head.left { margin: 0 0 48px; text-align: left; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease);
  white-space: nowrap;
}
.btn:focus-visible {
  outline: 2px solid var(--electric-blue-light);
  outline-offset: 3px;
}
.btn-primary {
  background: linear-gradient(135deg, var(--electric-blue), var(--violet));
  color: var(--white);
  box-shadow: 0 8px 30px -8px rgba(59, 111, 237, 0.6);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 36px -8px rgba(59, 111, 237, 0.75); }
.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border-color: rgba(255, 255, 255, 0.25);
}
.btn-secondary:hover { border-color: var(--electric-blue-light); background: rgba(255, 255, 255, 0.05); transform: translateY(-2px); }
.btn-ghost {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text-primary);
  border-color: rgba(255, 255, 255, 0.1);
}
.btn-ghost:hover { background: rgba(255, 255, 255, 0.12); }
.btn-block { width: 100%; }
.btn[disabled] { opacity: 0.6; cursor: not-allowed; transform: none !important; }

/* Navbar */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 18px 0;
  transition: background var(--dur-med) var(--ease), padding var(--dur-med) var(--ease), box-shadow var(--dur-med) var(--ease), border-color var(--dur-med) var(--ease);
  border-bottom: 1px solid transparent;
}
.navbar.scrolled {
  background: rgba(6, 11, 26, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  padding: 12px 0;
  border-bottom-color: rgba(255, 255, 255, 0.08);
  box-shadow: 0 8px 30px -12px rgba(0,0,0,0.5);
}
.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}
.brand-mark { width: 34px; height: 34px; flex-shrink: 0; }
.brand small { display: block; font-size: 0.62rem; font-weight: 500; color: var(--text-muted); letter-spacing: 0.08em; text-transform: uppercase; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav-links > li { position: relative; }
.nav-links a.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 10px 14px;
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color var(--dur-fast), background var(--dur-fast);
}
.nav-links a.nav-link:hover,
.nav-links a.nav-link.active {
  color: var(--white);
  background: rgba(255, 255, 255, 0.07);
}

.has-dropdown .dropdown {
  position: absolute;
  top: calc(100% + 10px);
  left: 0;
  min-width: 220px;
  background: var(--navy-700);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-md);
  padding: 8px;
  box-shadow: var(--shadow-soft);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease), visibility var(--dur-fast);
}
.has-dropdown:hover .dropdown,
.has-dropdown:focus-within .dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.dropdown a {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  color: var(--text-secondary);
}
.dropdown a:hover { background: rgba(255,255,255,0.06); color: var(--white); }
.dropdown a span.sub { font-size: 0.76rem; color: var(--text-muted); font-weight: 400; }

.nav-actions { display: flex; align-items: center; gap: 12px; }

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 10px;
  width: 42px;
  height: 42px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--white);
}

.mobile-menu {
  position: fixed;
  inset: 0;
  top: 0;
  background: var(--navy-900);
  z-index: 99;
  padding: 100px 24px 40px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  transform: translateX(100%);
  transition: transform var(--dur-med) var(--ease);
  overflow-y: auto;
}
.mobile-menu.open { transform: translateX(0); }
.mobile-menu a {
  padding: 16px 4px;
  font-size: 1.2rem;
  font-weight: 600;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.mobile-menu .sub-links { padding-left: 16px; display: flex; flex-direction: column; }
.mobile-menu .sub-links a { font-size: 1rem; font-weight: 500; color: var(--text-secondary); border-bottom: none; padding: 10px 4px; }
.mobile-menu .btn { margin-top: 20px; }

body.menu-open { overflow: hidden; }

/* Hero */
.hero {
  padding: 180px 0 120px;
  position: relative;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(circle at 15% 20%, rgba(59, 111, 237, 0.22), transparent 45%),
    radial-gradient(circle at 85% 15%, rgba(124, 58, 237, 0.18), transparent 50%),
    var(--navy-900);
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 60px;
  align-items: center;
}
.hero-content { max-width: 620px; }
.hero-content h1 { margin-bottom: 22px; }
.hero-content .lead { font-size: 1.15rem; color: var(--text-secondary); max-width: 560px; margin-bottom: 36px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* Content is visible by default (no-JS / JS-failure safe). Only once the
   "js" class confirms script execution do reveal targets start hidden,
   pre-empting the IntersectionObserver-driven fade-in in main.js. */
.js .reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity var(--dur-slow) var(--ease), transform var(--dur-slow) var(--ease);
}
.reveal.in-view { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: 0.08s; }
.reveal-delay-2 { transition-delay: 0.16s; }
.reveal-delay-3 { transition-delay: 0.24s; }
.reveal-delay-4 { transition-delay: 0.32s; }

/* Network visual */
.network-visual {
  position: relative;
  aspect-ratio: 1 / 1;
  max-width: 480px;
  margin: 0 auto;
}
.network-visual svg { width: 100%; height: 100%; }
.network-node { animation: pulse-node 3.6s ease-in-out infinite; transform-origin: center; }
.network-node.n2 { animation-delay: 0.6s; }
.network-node.n3 { animation-delay: 1.2s; }
.network-node.n4 { animation-delay: 1.8s; }
.network-line { stroke-dasharray: 6 6; animation: dash-flow 18s linear infinite; }

@keyframes pulse-node {
  0%, 100% { opacity: 0.55; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.12); }
}
@keyframes dash-flow {
  to { stroke-dashoffset: -240; }
}

.glass-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-radius: var(--radius-lg);
}

/* Floating product chips over hero */
.floating-chip {
  position: absolute;
  padding: 12px 18px;
  border-radius: 999px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.82rem;
  font-weight: 600;
  animation: float-chip 6s ease-in-out infinite;
}
.floating-chip .dot { width: 8px; height: 8px; border-radius: 50%; }
@keyframes float-chip {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* Generic page hero (secondary pages) */
.page-hero {
  padding: 160px 0 80px;
  text-align: center;
  position: relative;
}
.page-hero .eyebrow { justify-content: center; }
.page-hero p.lead { max-width: 680px; margin: 0 auto; font-size: 1.1rem; }

/* Cards grid */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }

.capability-card {
  background: var(--surface);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: transform var(--dur-med) var(--ease), border-color var(--dur-med) var(--ease), background var(--dur-med) var(--ease);
}
.capability-card:hover {
  transform: translateY(-6px);
  border-color: rgba(59, 111, 237, 0.4);
  background: var(--surface-raised);
}
.capability-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(59,111,237,0.25), rgba(124,58,237,0.25));
  margin-bottom: 20px;
  color: var(--electric-blue-light);
}
.capability-card h3 { margin-bottom: 10px; font-size: 1.15rem; }
.capability-card p { margin: 0; font-size: 0.94rem; }

/* Product cards (home + products page) */
.product-card {
  position: relative;
  border-radius: 28px;
  padding: 48px;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,0.08);
  background: var(--surface);
  isolation: isolate;
}
.product-card::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  opacity: 0.5;
  transition: opacity var(--dur-med) var(--ease);
}
.product-card:hover::before { opacity: 0.8; }
.product-card.sx::before {
  background: radial-gradient(circle at 20% 0%, rgba(13,148,136,0.35), transparent 55%), radial-gradient(circle at 100% 100%, rgba(245,158,11,0.15), transparent 50%);
}
.product-card.ft::before {
  background: radial-gradient(circle at 20% 0%, rgba(30,95,224,0.35), transparent 55%), radial-gradient(circle at 100% 100%, rgba(124,58,237,0.28), transparent 50%);
}
.product-card-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 28px; flex-wrap: wrap; gap: 16px; }
.product-logo { display: flex; align-items: center; gap: 12px; font-weight: 700; font-size: 1.3rem; }
.product-logo .mark { width: 42px; height: 42px; }
.product-tag {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(255,255,255,0.08);
}
.product-card h3 { font-size: 1.6rem; margin-bottom: 12px; }
.product-card .category { font-size: 0.82rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 14px; display: block; }
.product-card.sx .category { color: var(--sx-cyan); }
.product-card.ft .category { color: var(--ft-blue); }
.feature-list { list-style: none; margin: 24px 0 32px; padding: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 10px 20px; }
.feature-list li { display: flex; align-items: center; gap: 10px; font-size: 0.9rem; color: var(--text-secondary); }
.feature-list li svg { flex-shrink: 0; width: 16px; height: 16px; }
.product-card.sx .feature-list svg { color: var(--sx-teal); }
.product-card.ft .feature-list svg { color: var(--ft-blue); }

/* Hierarchy diagram */
.hierarchy {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
  padding: 40px 0;
}
.hierarchy-parent {
  padding: 20px 36px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--electric-blue), var(--violet));
  font-weight: 700;
  font-size: 1.15rem;
  box-shadow: var(--shadow-glow);
  text-align: center;
}
.hierarchy-parent small { display: block; font-size: 0.72rem; font-weight: 500; opacity: 0.85; text-transform: uppercase; letter-spacing: 0.08em; margin-top: 4px; }
.hierarchy-lines { width: 2px; height: 40px; background: linear-gradient(180deg, rgba(255,255,255,0.4), rgba(255,255,255,0.05)); }
.hierarchy-children {
  display: flex;
  gap: 60px;
  position: relative;
  padding-top: 40px;
}
.hierarchy-children::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  width: 2px;
  height: 40px;
  background: linear-gradient(180deg, rgba(255,255,255,0.4), rgba(255,255,255,0.05));
  transform: translateX(-50%);
}
.hierarchy-child {
  padding: 22px 32px;
  border-radius: 20px;
  border: 1px solid rgba(255,255,255,0.1);
  text-align: center;
  min-width: 200px;
}
.hierarchy-child.sx { background: linear-gradient(160deg, rgba(13,148,136,0.18), rgba(13,148,136,0.03)); }
.hierarchy-child.ft { background: linear-gradient(160deg, rgba(30,95,224,0.18), rgba(124,58,237,0.08)); }
.hierarchy-child strong { display: block; font-size: 1.1rem; margin-bottom: 4px; }
.hierarchy-child span { font-size: 0.82rem; color: var(--text-muted); }

/* Technology ecosystem */
.tech-orbit {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
}
.tech-chip {
  padding: 14px 22px;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid rgba(255,255,255,0.1);
  font-size: 0.92rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 10px;
  transition: transform var(--dur-fast) var(--ease), border-color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease);
}
.tech-chip:hover { transform: translateY(-4px) scale(1.03); border-color: var(--electric-blue-light); background: var(--surface-raised); }
.tech-chip .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--electric-blue-light); }

/* Mission / CTA */
.split-block { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.stat-frame {
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255,255,255,0.1);
  background: linear-gradient(160deg, rgba(59,111,237,0.12), rgba(124,58,237,0.08));
  padding: 40px;
}

.cta-band {
  border-radius: 32px;
  padding: 72px 48px;
  text-align: center;
  background: linear-gradient(135deg, rgba(59,111,237,0.18), rgba(124,58,237,0.18)), var(--surface);
  border: 1px solid rgba(255,255,255,0.1);
  position: relative;
  overflow: hidden;
}
.cta-band h2 { margin-bottom: 14px; }
.cta-band p { max-width: 560px; margin: 0 auto 32px; }
.cta-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* Brand showcase */
.showcase-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
.showcase-card {
  border-radius: var(--radius-lg);
  padding: 40px;
  border: 1px solid rgba(255,255,255,0.08);
  display: flex;
  flex-direction: column;
  gap: 16px;
  min-height: 280px;
  justify-content: flex-end;
  position: relative;
  overflow: hidden;
}
.showcase-card.sx { background: linear-gradient(160deg, rgba(13,148,136,0.28), var(--navy-800) 70%); }
.showcase-card.ft { background: linear-gradient(160deg, rgba(30,95,224,0.28), var(--navy-800) 70%); }
.showcase-card h3 { font-size: 1.5rem; }
.showcase-card .arrow-link { display: inline-flex; align-items: center; gap: 8px; font-weight: 600; }
.showcase-card .arrow-link svg { transition: transform var(--dur-fast) var(--ease); }
.showcase-card:hover .arrow-link svg { transform: translateX(4px); }

/* Product page specific hero themes */
.product-hero { padding: 170px 0 90px; position: relative; overflow: hidden; }
.product-hero.theme-sx .hero-bg { background: radial-gradient(circle at 20% 20%, rgba(13,148,136,0.28), transparent 50%), radial-gradient(circle at 85% 10%, rgba(245,158,11,0.15), transparent 50%), var(--navy-900); }
.product-hero.theme-ft .hero-bg { background: radial-gradient(circle at 20% 20%, rgba(30,95,224,0.3), transparent 50%), radial-gradient(circle at 85% 10%, rgba(124,58,237,0.22), transparent 50%), var(--navy-900); }

.pill-row { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 20px; }
.pill { padding: 8px 16px; border-radius: 999px; font-size: 0.78rem; font-weight: 600; background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.12); }

.feature-detail-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.feature-detail {
  background: var(--surface);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-md);
  padding: 26px;
}
.feature-detail .num { font-size: 0.78rem; font-weight: 700; color: var(--text-muted); margin-bottom: 12px; display: block; }
.feature-detail h4 { margin-bottom: 8px; }
.feature-detail p { font-size: 0.9rem; margin: 0; }

/* Legal pages */
.legal-content { max-width: 780px; margin: 0 auto; }
.legal-content h2 { margin-top: 48px; font-size: 1.4rem; }
.legal-content h2:first-child { margin-top: 0; }
.legal-content ul { color: var(--text-secondary); padding-left: 20px; }
.legal-content li { margin-bottom: 8px; }
.legal-updated { color: var(--text-muted); font-size: 0.88rem; margin-bottom: 40px; }

/* Contact page */
.contact-grid { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 48px; align-items: start; }
.form-card {
  background: var(--surface);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-lg);
  padding: 40px;
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.field { margin-bottom: 20px; }
.field label { display: block; font-size: 0.85rem; font-weight: 600; margin-bottom: 8px; color: var(--text-secondary); }
.field input, .field textarea {
  width: 100%;
  padding: 13px 16px;
  border-radius: 10px;
  border: 1px solid rgba(255,255,255,0.14);
  background: rgba(255,255,255,0.04);
  color: var(--white);
  font-family: inherit;
  font-size: 0.95rem;
  transition: border-color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease);
}
.field input:focus, .field textarea:focus {
  outline: none;
  border-color: var(--electric-blue-light);
  background: rgba(255,255,255,0.07);
}
.field textarea { min-height: 140px; resize: vertical; }
.field .error-msg { display: none; color: #f87171; font-size: 0.8rem; margin-top: 6px; }
.field.has-error input, .field.has-error textarea { border-color: #f87171; }
.field.has-error .error-msg { display: block; }
.field .required-mark { color: var(--electric-blue-light); }
.honeypot-field { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

.form-status {
  display: none;
  padding: 16px 18px;
  border-radius: 12px;
  margin-bottom: 20px;
  font-size: 0.92rem;
  font-weight: 500;
}
.form-status.show { display: block; }
.form-status.success { background: rgba(16, 185, 129, 0.14); border: 1px solid rgba(16, 185, 129, 0.4); color: #6ee7b7; }
.form-status.error { background: rgba(248, 113, 113, 0.14); border: 1px solid rgba(248, 113, 113, 0.4); color: #fca5a5; }

.contact-info-card {
  background: var(--surface);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-lg);
  padding: 36px;
}
.contact-info-card h3 { margin-bottom: 8px; }
.info-line { display: flex; justify-content: space-between; padding: 14px 0; border-bottom: 1px solid rgba(255,255,255,0.08); font-size: 0.92rem; }
.info-line:last-child { border-bottom: none; }
.info-line span:first-child { color: var(--text-muted); }
.info-line a { font-weight: 600; color: var(--electric-blue-light); }

/* Footer */
.site-footer {
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 72px 0 32px;
  background: var(--navy-900);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}
.footer-brand p { max-width: 280px; font-size: 0.9rem; }
.footer-col h4 { font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-muted); margin-bottom: 18px; }
.footer-col ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 12px; }
.footer-col a { font-size: 0.92rem; color: var(--text-secondary); transition: color var(--dur-fast); }
.footer-col a:hover { color: var(--white); }
.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 28px;
  border-top: 1px solid rgba(255,255,255,0.08);
  font-size: 0.85rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 12px;
}

/* Skip link */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--electric-blue);
  color: var(--white);
  padding: 12px 20px;
  z-index: 1000;
  border-radius: 0 0 10px 0;
}
.skip-link:focus { left: 0; }

/* Utility */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.gradient-text {
  background: linear-gradient(135deg, var(--electric-blue-light), var(--violet-light));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* =========== Responsive =========== */
@media (max-width: 1024px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-content { max-width: 100%; }
  .network-visual { max-width: 360px; margin-top: 20px; }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .feature-detail-grid { grid-template-columns: repeat(2, 1fr); }
  .split-block { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 860px) {
  .nav-links, .nav-actions .btn { display: none; }
  .nav-toggle { display: flex; }
  .grid-2, .showcase-grid { grid-template-columns: 1fr; }
  .hierarchy-children { flex-direction: column; gap: 24px; }
  .hierarchy-children::before { display: none; }
}

@media (max-width: 640px) {
  section { padding: 64px 0; }
  .hero { padding: 140px 0 80px; }
  .page-hero { padding: 130px 0 60px; }
  .grid-3, .feature-detail-grid { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; align-items: flex-start; }
  .product-card { padding: 32px 24px; }
  .feature-list { grid-template-columns: 1fr; }
  .cta-band { padding: 48px 24px; }
}