/* Base */
  html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
  }

  body {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }

  /* Selection */
  ::selection {
    background: rgba(13, 148, 136, 0.2);
    color: #0f766e;
  }

  /* Scroll reveal — progressive enhancement, only active when JS runs */
  .reveal {
    opacity: 1;
    transform: none;
    transition: opacity 0.6s ease, transform 0.6s ease;
  }

  @media (prefers-reduced-motion: no-preference) {
    .reveal {
      opacity: 0;
      transform: translateY(24px);
    }

    .reveal.revealed {
      opacity: 1;
      transform: translateY(0);
    }
  }

  /* 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;
  }

  /* Nav shadow on scroll */
  #nav.scrolled {
    box-shadow: 0 1px 20px rgba(0, 0, 0, 0.08);
  }

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

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

  /* Mobile menu animation */
  #mobile-menu {
    animation: slideDown 0.2s ease-out;
  }

  @keyframes slideDown {
    from {
      opacity: 0;
      transform: translateY(-8px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }