*, *::before, *::after {
    box-sizing: border-box;
  }

  html {
    scroll-behavior: smooth;
    scroll-padding-top: 72px;
  }

  body {
    overflow-x: hidden;
  }

  /* Custom scrollbar */
  ::-webkit-scrollbar {
    width: 8px;
  }
  ::-webkit-scrollbar-track {
    background: #0A2540;
  }
  ::-webkit-scrollbar-thumb {
    background: #1A2D3D;
    border-radius: 4px;
  }
  ::-webkit-scrollbar-thumb:hover {
    background: #274054;
  }

  /* Selection */
  ::selection {
    background: rgba(94, 234, 212, 0.2);
    color: #F0FFF8;
  }

  /* Marquee animation */
  @keyframes marquee {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
  }
  .animate-marquee {
    animation: marquee 30s linear infinite;
  }

  /* Mobile menu */
  #mobile-menu.open {
    opacity: 1 !important;
    pointer-events: all !important;
  }

  #mobile-menu.closed {
    opacity: 0 !important;
    pointer-events: none !important;
  }

  /* Nav active state */
  #nav.scrolled {
    background: rgba(6, 20, 32, 0.95);
    backdrop-blur: lg;
  }

  /* Service card hover */
  .service-card {
    transform: translateY(0);
    transition: transform 0.3s ease, border-color 0.3s ease, background 0.3s ease;
  }
  .service-card:hover {
    transform: translateY(-4px);
  }

  /* Testimonial card hover */
  .testimonial-card {
    transition: transform 0.3s ease, border-color 0.3s ease;
  }
  .testimonial-card:hover {
    transform: translateY(-2px);
  }

  /* Scroll reveal (progressive enhancement) */
  @media (prefers-reduced-motion: no-preference) {
    .reveal {
      opacity: 0;
      transform: translateY(24px);
      transition: opacity 0.6s ease, transform 0.6s ease;
    }
    .reveal.revealed {
      opacity: 1;
      transform: translateY(0);
    }
    .reveal-delay-1 { transition-delay: 0.1s; }
    .reveal-delay-2 { transition-delay: 0.2s; }
    .reveal-delay-3 { transition-delay: 0.3s; }
    .reveal-delay-4 { transition-delay: 0.4s; }
  }

  /* Mobile menu button animation */
  .menu-line {
    transition: transform 0.3s ease, opacity 0.3s ease, width 0.3s ease;
  }
  #menu-btn.active .menu-line:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
  }
  #menu-btn.active .menu-line:nth-child(2) {
    opacity: 0;
  }
  #menu-btn.active .menu-line:nth-child(3) {
    width: 24px;
    transform: rotate(-45deg) translate(5px, -5px);
  }

  /* Focus visible for accessibility */
  a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
    outline: 2px solid #5EEAD4;
    outline-offset: 2px;
    border-radius: 4px;
  }

  /* Mobile menu links */
  .mobile-link {
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.3s ease, transform 0.3s ease;
  }
  #mobile-menu.open .mobile-link {
    opacity: 1;
    transform: translateY(0);
  }
  #mobile-menu.open .mobile-link:nth-child(1) { transition-delay: 0.05s; }
  #mobile-menu.open .mobile-link:nth-child(2) { transition-delay: 0.1s; }
  #mobile-menu.open .mobile-link:nth-child(3) { transition-delay: 0.15s; }
  #mobile-menu.open .mobile-link:nth-child(4) { transition-delay: 0.2s; }
  #mobile-menu.open .mobile-link:nth-child(5) { transition-delay: 0.25s; }
  #mobile-menu.open .mobile-link:nth-child(6) { transition-delay: 0.3s; }