/* ==========================================================================
   1. Custom Properties — Design Tokens
   ========================================================================== */
:root {
  color-scheme: dark;

  /* Colors */
  --bg: #050505;
  --surface: #111111;
  --card: #181818;
  --accent-primary: #00D4FF;
  --accent-secondary: #6C63FF;
  --accent-error: #FF6B6B;
  --text: #FFFFFF;
  --text-muted: #BBBBBB;
  --border: rgba(255, 255, 255, 0.08);
  --border-interactive: rgba(255, 255, 255, 0.18);

  --gradient-signal: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 40px rgba(0, 212, 255, 0.25);

  --nav-bg: rgba(5, 5, 5, 0.7);
  --nav-blur: 16px;

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 999px;

  /* Spacing (8px base, in rem) */
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --space-6: 4rem;
  --space-7: 6rem;
  --space-8: 8rem;

  /* Typography */
  --font-display: 'Unbounded', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  --fs-hero: clamp(2.5rem, 6vw, 5.5rem);
  --fs-h2: clamp(1.5rem, 3vw, 2.25rem);
  --fs-h3: clamp(1.125rem, 2vw, 1.5rem);
  --fs-body: 1rem;
  --fs-small: 0.875rem;
  --fs-micro: 0.75rem;

  --lh-tight: 1.1;
  --lh-body: 1.6;

  /* Motion */
  --ease-standard: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-fast: 150ms;
  --dur-base: 300ms;

  /* Layout */
  --container-max: 1200px;
  --focus-ring: 2px solid var(--accent-primary);
}

/* ==========================================================================
   2. Reset / Base
   ========================================================================== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
img, picture, svg, canvas { display: block; max-width: 100%; }
ul, ol { list-style: none; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input, textarea, select { font: inherit; }

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: var(--font-display);
  line-height: var(--lh-tight);
  font-weight: 700;
}
h1 { font-size: var(--fs-hero); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); }

/* ==========================================================================
   3. Accessibility Helpers
   ========================================================================== */
.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-2);
  background: var(--accent-primary);
  color: var(--bg);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  z-index: 1000;
  transition: top var(--dur-fast) var(--ease-standard);
}
.skip-link:focus { top: var(--space-2); }

.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

:focus-visible {
  outline: var(--focus-ring);
  outline-offset: 3px;
}

/* ==========================================================================
   4. Layout Primitives
   ========================================================================== */
.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

/* ==========================================================================
   5. Typography Utilities
   ========================================================================== */
.eyebrow {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-primary);
  margin-bottom: var(--space-2);
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-weight: 600;
  transition: gap var(--dur-fast) var(--ease-standard), color var(--dur-fast) var(--ease-standard);
}
.link-arrow:hover, .link-arrow:focus-visible {
  gap: var(--space-2);
  color: var(--accent-primary);
}

/* ==========================================================================
   6. Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: var(--fs-small);
  letter-spacing: 0.02em;
  transition: transform var(--dur-fast) var(--ease-standard),
              box-shadow var(--dur-fast) var(--ease-standard),
              background var(--dur-fast) var(--ease-standard);
}

.btn--primary { background: var(--accent-primary); color: var(--bg); }
.btn--primary:hover, .btn--primary:focus-visible {
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.btn--secondary { background: transparent; color: var(--text); border: 1px solid var(--border-interactive); }
.btn--secondary:hover, .btn--secondary:focus-visible {
  background: rgba(255,255,255,0.05);
  border-color: var(--accent-primary);
}

/* ==========================================================================
   7. Cards
   ========================================================================== */
.industry-card,
.project-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  box-shadow: var(--shadow-card);
  transition: transform var(--dur-base) var(--ease-standard),
              box-shadow var(--dur-base) var(--ease-standard),
              border-color var(--dur-base) var(--ease-standard);
}
.industry-card:hover, .project-card:hover,
.industry-card:focus-within, .project-card:focus-within {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
  border-color: var(--border-interactive);
}
.industry-card h3, .project-card h3 { margin-bottom: var(--space-1); }
.industry-card p, .project-card p { color: var(--text-muted); font-size: var(--fs-small); }

.industry-card summary,
.project-card summary {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-2);
  cursor: pointer;
  list-style: none;
}
.industry-card summary::-webkit-details-marker,
.project-card summary::-webkit-details-marker { display: none; }
.industry-card summary::after,
.project-card summary::after {
  content: '+';
  font-family: var(--font-mono);
  color: var(--accent-primary);
  flex-shrink: 0;
}
.industry-card details[open] summary::after,
.project-card details[open] summary::after { content: '−'; }
.industry-card__detail,
.project-card__detail {
  margin-top: var(--space-3);
  padding-top: var(--space-3);
  border-top: 1px solid var(--border);
}

/* ==========================================================================
   8. Navigation
   ========================================================================== */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--nav-bg);
  backdrop-filter: blur(var(--nav-blur));
  -webkit-backdrop-filter: blur(var(--nav-blur));
  border-bottom: 1px solid var(--border);
}

.nav__inner {
  max-width: var(--container-max);
  margin-inline: auto;
  padding: var(--space-2) var(--space-3);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
}

.nav__logo {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-display);
  font-weight: 700;
}

.nav__toggle {
  display: inline-flex;
  flex-direction: column;
  gap: 4px;
  padding: var(--space-1);
}
.nav__toggle span {
  width: 22px; height: 2px;
  background: var(--text);
  border-radius: var(--radius-full);
  transition: transform var(--dur-fast) var(--ease-standard), opacity var(--dur-fast);
}

.nav__menu {
  position: fixed;
  inset: 64px 0 0 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  background: var(--nav-bg);
  backdrop-filter: blur(var(--nav-blur));
  opacity: 0;
  transform: translateY(-12px);
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--dur-base) var(--ease-standard),
              transform var(--dur-base) var(--ease-standard),
              visibility var(--dur-base);
}
.nav__toggle[aria-expanded="true"] ~ .nav__menu {
  opacity: 1;
  transform: translateY(0);
  visibility: visible;
  pointer-events: auto;
}

/* ==========================================================================
   9. Hero
   ========================================================================== */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-6) var(--space-3);
  overflow: hidden;
}
.hero__particles { position: absolute; inset: 0; z-index: 0; }
.hero__content { position: relative; z-index: 1; max-width: 760px; }
.hero__subtitle {
  color: var(--text-muted);
  font-size: clamp(1rem, 1.5vw, 1.25rem);
  margin-block: var(--space-3) var(--space-5);
}
.hero__actions {
  display: flex; flex-wrap: wrap; gap: var(--space-2); justify-content: center;
}

/* ==========================================================================
   10. Stats
   ========================================================================== */
.stats { padding: var(--space-5) var(--space-3); border-block: 1px solid var(--border); }
.stats__list {
  max-width: var(--container-max);
  margin-inline: auto;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
  text-align: center;
}
.stats__item { display: flex; flex-direction: column-reverse; gap: var(--space-1); }
.stats__number {
  font-family: var(--font-mono);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 500;
  color: var(--accent-primary);
}
.stats__label {
  font-size: var(--fs-small); color: var(--text-muted);
  text-transform: uppercase; letter-spacing: 0.08em;
}

/* ==========================================================================
   11. Generic Content Section Pattern
   ========================================================================== */
.about-preview, .vision, .innovation, .industries,
.featured-projects, .global-presence, .news-preview, .careers-teaser {
  padding: var(--space-7) var(--space-3);
  max-width: var(--container-max);
  margin-inline: auto;
}
.about-preview p, .vision p, .innovation p {
  max-width: 640px; color: var(--text-muted); margin-block: var(--space-2) var(--space-3);
}

/* ==========================================================================
   12. Grids
   ========================================================================== */
.industries__grid, .projects__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
  margin-block: var(--space-4);
}

/* ==========================================================================
   13. Timeline
   ========================================================================== */
.timeline {
  position: relative;
  max-width: 640px;
  margin-inline: auto;
  padding-left: var(--space-4);
  border-left: 1px solid var(--border);
}
.timeline__item { position: relative; p