/* ========== Base & Utilities ========== */
  *, *::before, *::after { box-sizing: border-box; }
  html { scroll-behavior: smooth; scroll-padding-top: 80px; }
  body { margin: 0; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }

  /* ========== Scroll Reveal (progressive enhancement) ========== */
  @media (prefers-reduced-motion: no-preference) {
    .reveal-up, .reveal-left, .reveal-right {
      opacity: 1;
      transform: none;
      transition: opacity 0.6s ease, transform 0.6s ease;
    }
  }

  /* When JS is enabled, set initial hidden states */
  .js .reveal-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
  }
  .js .reveal-left {
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
  }
  .js .reveal-right {
    opacity: 0;
    transform: translateX(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
  }

  /* When reduced motion is preferred, always show content */
  @media (prefers-reduced-motion: reduce) {
    .reveal-up, .reveal-left, .reveal-right {
      opacity: 1;
      transform: none !important;
    }
  }

  .js.revealed .reveal-up,
  .js.revealed .reveal-left,
  .js.revealed .reveal-right {
    opacity: 1;
    transform: none;
  }

  /* ========== Header shadow on scroll ========== */
  #site-header.scrolled {
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  }

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

  /* ========== Focus styles ========== */
  a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
    outline: 2px solid #0d9488;
    outline-offset: 2px;
    border-radius: 4px;
  }

  /* ========== Selection ========== */
  ::selection {
    background-color: #0d9488;
    color: #fff;
  }

  /* ========== 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; }