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

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

  body {
    margin: 0;
  }

  ::selection {
    background: rgba(45, 212, 191, 0.3);
    color: #fff;
  }

  /* ═══════════════════ NAVIGATION ═══════════════════ */
  #header {
    background: transparent;
  }

  #header.scrolled {
    background: rgba(5, 22, 35, 0.92);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    box-shadow: 0 4px 40px rgba(0, 0, 0, 0.3);
  }

  #header.scrolled .font-serif {
    color: #fff;
  }

  .nav-link {
    position: relative;
  }

  .nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: #2DD4BF;
    transition: width 0.3s ease;
  }

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

  .nav-link:hover {
    color: #fff !important;
  }

  /* ═══════════════════ MOBILE MENU ═══════════════════ */
  #mobile-menu.open {
    opacity: 1 !important;
    pointer-events: all !important;
  }

  .mobile-nav-link {
    position: relative;
    transition: all 0.3s ease;
  }

  .mobile-nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: #2DD4BF;
    transition: width 0.3s ease;
  }

  .mobile-nav-link:hover::after {
    width: 60%;
  }

  .mobile-nav-link:hover {
    color: #5EEAD4 !important;
  }

  /* ═══════════════════ SCROLL ANIMATIONS ═══════════════════ */
  .reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
  }

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

  .reveal-delay-1 { transition-delay: 0.1s; }
  .reveal-delay-2 { transition-delay: 0.2s; }
  .reveal-delay-3 { transition-delay: 0.3s; }
  .reveal-delay-4 { transition-delay: 0.4s; }

  /* ═══════════════════ FORM STYLES ═══════════════════ */
  select option {
    background: #0A2540;
    color: #fff;
  }

  /* ═══════════════════ CUSTOM SCROLLBAR ═══════════════════ */
  ::-webkit-scrollbar {
    width: 8px;
  }

  ::-webkit-scrollbar-track {
    background: #051623;
  }

  ::-webkit-scrollbar-thumb {
    background: rgba(45, 212, 191, 0.3);
    border-radius: 4px;
  }

  ::-webkit-scrollbar-thumb:hover {
    background: rgba(45, 212, 191, 0.5);
  }

  /* ═══════════════════ RESPONSIVE ═══════════════════ */
  @media (max-width: 767px) {
    #hero h1 {
      font-size: 3rem;
    }

    #hero h1 span {
      font-size: 2.5rem;
    }

    .font-serif.text-4xl {
      font-size: 2.25rem;
    }
  }

  @media (min-width: 768px) and (max-width: 1023px) {
    #hero h1 {
      font-size: 4rem;
    }
  }