/* Base */
  *, *::before, *::after { box-sizing: border-box; }
  html { scroll-behavior: smooth; scroll-padding-top: 5rem; }
  body { margin: 0; }

  /* Focus styles */
  :focus-visible { outline: 2px solid #0d9488; outline-offset: 2px; border-radius: 4px; }

  /* 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; }
    .reveal-delay-5 { transition-delay: 0.5s; }
  }

  /* Mobile menu animation */
  #mobileMenu {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
  }
  #mobileMenu.open {
    max-height: 400px;
  }

  /* Navbar scroll state */
  header.scrolled {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  }

  /* Service card shimmer on hover */
  .service-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 16px;
    opacity: 0;
    transition: opacity 0.3s ease;
    pointer-events: none;
  }

  /* Custom scrollbar */
  ::-webkit-scrollbar { width: 8px; }
  ::-webkit-scrollbar-track { background: #f1f5f9; }
  ::-webkit-scrollbar-thumb { background: #94a3b8; border-radius: 4px; }
  ::-webkit-scrollbar-thumb:hover { background: #64748b; }

  /* Selection color */
  ::selection { background: #0d9488; color: white; }

  /* Smooth image loading */
  img {
    image-rendering: auto;
    will-change: transform;
  }