/* Base */
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }

  html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }

  body {
    overflow-x: hidden;
  }

  ::selection {
    background-color: rgba(13, 148, 136, 0.15);
    color: #134e4a;
  }

  /* Scroll reveal — progressive enhancement, only active when JS runs */
  .reveal {
    opacity: 1;
    transform: none;
    transition: opacity 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94),
                transform 0.8s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  }

  @media (prefers-reduced-motion: no-preference) {
    .reveal {
      opacity: 0;
      transform: translateY(32px);
    }

    .reveal.revealed {
      opacity: 1;
      transform: translateY(0);
    }

    .reveal:nth-child(2) { transition-delay: 0.1s; }
    .reveal:nth-child(3) { transition-delay: 0.2s; }
    .reveal:nth-child(4) { transition-delay: 0.3s; }
    .reveal:nth-child(5) { transition-delay: 0.4s; }
    .reveal:nth-child(6) { transition-delay: 0.5s; }
  }

  /* Hero */
  #hero {
    position: relative;
  }

  /* Header scroll state */
  #header.scrolled {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.06);
  }

  /* Nav links */
  .nav-link {
    position: relative;
  }

  .nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background-color: #0d9488;
    transition: width 0.3s ease;
  }

  .nav-link:hover::after {
    width: 100%;
  }

  /* Mobile menu */
  #mobile-menu.open {
    opacity: 1;
    pointer-events: all;
  }

  #mobile-menu.closed {
    opacity: 0;
    pointer-events: none;
  }

  .menu-line {
    display: block;
  }

  .menu-toggle.active .menu-line:nth-child(1) {
    transform: rotate(45deg) translate(3px, 3px);
  }

  .menu-toggle.active .menu-line:nth-child(2) {
    opacity: 0;
  }

  .menu-toggle.active .menu-line:nth-child(3) {
    transform: rotate(-45deg) translate(3px, -3px);
    width: 1.25rem;
  }

  /* Service cards */
  .service-card {
    transition: transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94),
                box-shadow 0.4s ease,
                border-color 0.4s ease;
  }

  .service-card:hover {
    transform: translateY(-4px);
  }

  /* Parallax image */
  .hero-img {
    will-change: transform;
  }

  /* Smooth scroll offset for fixed header */
  section[id] {
    scroll-margin-top: 80px;
  }

  /* Custom scrollbar */
  ::-webkit-scrollbar {
    width: 6px;
  }

  ::-webkit-scrollbar-track {
    background: #f8fafc;
  }

  ::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 3px;
  }

  ::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
  }