/* ── Base & Utilities ── */
  *, *::before, *::after { box-sizing: border-box; }
  html { scroll-behavior: smooth; scroll-padding-top: 80px; }
  body { overflow-x: hidden; }

  /* ── 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 ── */
  ::selection { background: #ccfbf1; color: #134e4a; }

  /* ── Fade-in Animation ── */
  .fade-in {
    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);
  }
  .fade-in.visible {
    opacity: 1;
    transform: translateY(0);
  }

  /* ── Stagger children ── */
  .stagger-children > * { transition-delay: calc(var(--index, 0) * 0.08s); }

  /* ── Navbar scroll state ── */
  #navbar.scrolled {
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    box-shadow: 0 1px 0 rgba(0,0,0,0.06), 0 4px 20px rgba(0,0,0,0.04);
  }

  /* ── Service card hover ── */
  .group:hover .group-hover\:scale-110 { transform: scale(1.1); }

  /* ── Mobile menu animation ── */
  #mobile-menu {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.25s ease;
    opacity: 0;
  }
  #mobile-menu.open {
    max-height: 500px;
    opacity: 1;
  }

  /* ── Floating card animation ── */
  @keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-8px); }
  }
  .float-anim { animation: float 4s ease-in-out infinite; }

  /* ── Pulse dot ── */
  @keyframes pulse-dot {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(1.3); }
  }
  .animate-pulse { animation: pulse-dot 2s ease-in-out infinite; }

  /* ── Responsive tweaks ── */
  @media (max-width: 640px) {
    .font-serif { line-height: 1.15; }
  }

  /* ── Select arrow ── */
  select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 2.5rem;
  }