/* ── Smooth scrolling ── */
  html {
    scroll-behavior: smooth;
  }

  /* ── Scroll reveal (progressive enhancement) ── */
  @media (prefers-reduced-motion: no-preference) {
    .reveal {
      opacity: 0;
      transform: translateY(24px);
      transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
    }
    .reveal.revealed {
      opacity: 1;
      transform: translateY(0);
    }
  }

  /* Fallback: always visible when JS is disabled or prefers-reduced-motion */
  @media (prefers-reduced-motion: reduce) {
    .reveal {
      opacity: 1;
      transform: none;
    }
  }

  /* ── Navbar scroll state ── */
  #navbar.scrolled {
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(12px);
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.06);
  }

  /* ── Mobile menu animation ── */
  #mobileMenu {
    animation: slideDown 0.25s ease-out;
  }
  @keyframes slideDown {
    from { opacity: 0; transform: translateY(-8px); }
    to { 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;
  }

  /* ── Selection color ── */
  ::selection {
    background: #0d9488;
    color: #f0fdfa;
  }