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

  /* NAV SCROLLED STATE */
  #nav.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    box-shadow: 0 1px 0 rgba(0,0,0,0.06), 0 4px 20px rgba(0,0,0,0.04);
  }
  #nav.scrolled .font-display { color: #1a1a20; }

  /* MOBILE MENU */
  #mobile-menu.open { transform: translateX(0); }

  /* SERVICE CARDS */
  .service-card {
    opacity: 1;
    transform: translateY(0);
  }
  @media (prefers-reduced-motion: no-preference) {
    .service-card {
      opacity: 0;
      transform: translateY(24px);
      transition: opacity 0.6s ease, transform 0.6s ease, box-shadow 0.3s ease, border-color 0.3s ease, background 0.3s ease;
    }
    .service-card.revealed {
      opacity: 1;
      transform: translateY(0);
    }
  }

  /* FRAME CARDS */
  .frame-card {
    opacity: 1;
    transform: translateY(0);
  }
  @media (prefers-reduced-motion: no-preference) {
    .frame-card {
      opacity: 0;
      transform: translateY(20px);
      transition: opacity 0.5s ease, transform 0.5s ease;
    }
    .frame-card.revealed {
      opacity: 1;
      transform: translateY(0);
    }
  }

  /* TESTIMONIAL CARDS */
  .testimonial-card {
    opacity: 1;
    transform: translateY(0);
  }
  @media (prefers-reduced-motion: no-preference) {
    .testimonial-card {
      opacity: 0;
      transform: translateY(20px);
      transition: opacity 0.5s ease, transform 0.5s ease, background 0.3s ease;
    }
    .testimonial-card.revealed {
      opacity: 1;
      transform: translateY(0);
    }
  }

  /* SECTION REVEALS */
  .reveal-up {
    opacity: 1;
    transform: translateY(0);
  }
  @media (prefers-reduced-motion: no-preference) {
    .reveal-up {
      opacity: 0;
      transform: translateY(30px);
      transition: opacity 0.7s ease, transform 0.7s ease;
    }
    .reveal-up.revealed {
      opacity: 1;
      transform: translateY(0);
    }
  }

  /* CUSTOM SCROLLBAR */
  ::-webkit-scrollbar { width: 8px; }
  ::-webkit-scrollbar-track { background: #f6f6f7; }
  ::-webkit-scrollbar-thumb { background: #c4c4cc; border-radius: 4px; }
  ::-webkit-scrollbar-thumb:hover { background: #9e9eaa; }

  /* SELECTION */
  ::selection { background: rgba(255, 99, 58, 0.15); color: #1a1a20; }

  /* FOCUS VISIBLE */
  :focus-visible { outline: 2px solid #ff633a; outline-offset: 2px; border-radius: 4px; }

  /* MOBILE LINK HOVER */
  .mobile-link:hover { color: #ff633a; }

  /* NAV HEIGHT */
  #nav { height: 72px; }

  /* HERO ANIMATION */
  @media (prefers-reduced-motion: no-preference) {
    .hero-fade-in {
      animation: heroFadeIn 1s ease forwards;
    }
    .hero-fade-in-delay {
      animation: heroFadeIn 1s ease 0.2s forwards;
      opacity: 0;
    }
    .hero-fade-in-delay-2 {
      animation: heroFadeIn 1s ease 0.4s forwards;
      opacity: 0;
    }
    .hero-fade-in-delay-3 {
      animation: heroFadeIn 1s ease 0.6s forwards;
      opacity: 0;
    }
  }
  @keyframes heroFadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
  }

  /* COUNTER ANIMATION */
  @media (prefers-reduced-motion: no-preference) {
    .stat-number {
      display: inline-block;
    }
  }