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

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

  /* ── Navbar scroll state ── */
  #navbar {
    transition: background 0.3s ease, box-shadow 0.3s ease, padding 0.3s ease;
  }

  #navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    box-shadow: 0 1px 20px rgba(0, 0, 0, 0.06);
  }

  /* ── Floating card animations ── */
  @keyframes float-slow {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
  }

  @keyframes float-medium {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-7px); }
  }

  @keyframes float-fast {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-5px); }
  }

  .animate-float-slow {
    animation: float-slow 5s ease-in-out infinite;
  }

  .animate-float-medium {
    animation: float-medium 4s ease-in-out infinite;
  }

  .animate-float-fast {
    animation: float-fast 3.5s ease-in-out infinite;
  }

  /* ── 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);
    }

    .reveal:nth-child(2) { transition-delay: 0.08s; }
    .reveal:nth-child(3) { transition-delay: 0.16s; }
    .reveal:nth-child(4) { transition-delay: 0.24s; }
    .reveal:nth-child(5) { transition-delay: 0.32s; }
    .reveal:nth-child(6) { transition-delay: 0.40s; }
  }

  /* ── Mobile menu ── */
  #mobileMenu {
    animation: slideDown 0.25s ease;
  }

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

  /* ── Back to top ── */
  #backToTop.visible {
    opacity: 1;
    pointer-events: auto;
  }

  /* ── Custom scrollbar ── */
  ::-webkit-scrollbar {
    width: 8px;
  }
  ::-webkit-scrollbar-track {
    background: #f1f5f9;
  }
  ::-webkit-scrollbar-thumb {
    background: #94a3b8;
    border-radius: 999px;
  }
  ::-webkit-scrollbar-thumb:hover {
    background: #64748b;
  }