*, *::before, *::after {
    box-sizing: border-box;
  }

  html {
    scroll-behavior: smooth;
  }

  body {
    margin: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }

  img {
    display: block;
    max-width: 100%;
  }

  /* ─── Section Labels ─── */
  .section-label {
    letter-spacing: 0.25em;
  }

  /* ─── Divider ─── */
  .divider {
    height: 1px;
    background: linear-gradient(to right, transparent, #ccfbf1, #0d9488, #ccfbf1, transparent);
    margin: 0;
  }

  /* ─── Buttons ─── */
  .btn-primary {
    box-shadow: 0 4px 20px rgba(13, 148, 136, 0.25);
  }
  .btn-primary:hover {
    box-shadow: 0 6px 28px rgba(13, 148, 136, 0.35);
  }

  .btn-secondary {
    backdrop-filter: blur(4px);
  }

  /* ─── Nav ─── */
  #nav {
    background: transparent;
    transition: background 0.35s ease, box-shadow 0.35s ease;
  }
  #nav.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    box-shadow: 0 1px 0 rgba(13, 148, 136, 0.1);
  }
  #nav.scrolled .nav-link {
    color: #475569;
  }
  #nav.scrolled .font-serif {
    color: #0f766e;
  }

  /* ─── Scroll Reveal ─── */
  .reveal {
    opacity: 1;
    transform: none;
    transition: opacity 0.7s cubic-bezier(0.22, 1, 0.36, 1), transform 0.7s cubic-bezier(0.22, 1, 0.36, 1);
  }

  @media (prefers-reduced-motion: no-preference) {
    .reveal {
      opacity: 0;
      transform: translateY(24px);
    }
    .reveal.revealed {
      opacity: 1;
      transform: translateY(0);
    }
  }

  /* ─── Hero Animations ─── */
  .hero-eyebrow {
    opacity: 0;
    animation: fadeUp 0.8s 0.3s cubic-bezier(0.22, 1, 0.36, 1) forwards;
  }
  .hero-title {
    opacity: 0;
    animation: fadeUp 0.8s 0.5s cubic-bezier(0.22, 1, 0.36, 1) forwards;
  }
  .hero-subtitle {
    opacity: 0;
    animation: fadeUp 0.8s 0.7s cubic-bezier(0.22, 1, 0.36, 1) forwards;
  }
  .hero-cta {
    opacity: 0;
    animation: fadeUp 0.8s 0.9s cubic-bezier(0.22, 1, 0.36, 1) forwards;
  }
  .hero-scroll {
    opacity: 0;
    animation: fadeIn 0.8s 1.3s ease forwards;
  }

  @keyframes fadeUp {
    from {
      opacity: 0;
      transform: translateY(20px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  @keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
  }

  /* ─── Cards ─── */
  .card {
    background: white;
    border-radius: 1rem;
    padding: 0;
    transition: box-shadow 0.3s ease;
  }
  .card:hover {
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.08);
  }

  /* ─── Mobile Menu ─── */
  #mobileMenu {
    animation: slideDown 0.25s ease forwards;
  }
  @keyframes slideDown {
    from { opacity: 0; transform: translateY(-8px); }
    to { opacity: 1; transform: translateY(0); }
  }

  .mobile-link {
    display: block;
    padding: 0.5rem 0;
  }

  /* ─── Selection ─── */
  ::selection {
    background: rgba(13, 148, 136, 0.2);
    color: #134e4a;
  }