/* CSS Variables */
:root {
    --primary-blue: #0a2463;
    --accent-blue: #3e92cc;
    --light-blue: #e3f2fd;
    --text-dark: #333333;
    --text-light: #ffffff;
    --text-gray: #666666;
    --bg-white: #ffffff;
    --shadow-light: 0 4px 20px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 8px 30px rgba(0, 0, 0, 0.15);
    --border-radius: 12px;
    --transition: all 0.3s ease;
  }


.header {
    background: var(--bg-white);
    padding: 15px 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all 0.3s ease;
  }

  .header.scrolled {
    padding: 10px 0;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
  }

  .header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .logo {
    display: flex;
    align-items: center;
    text-decoration: none;
  }

  .logo-text {
    font-size: 24px;
    font-weight: 700;
    display: flex;
    align-items: center;
    color: var(--primary-blue);
  }

  .logo-text img {
    width: 100px;
    height: 100px;
    /* box-shadow: 10px 10px 10px rgba(0, 0, 0, 0.119); */
  }

  .logo-text .dr {
    font-size: 32px;
  }

  .logo-text .london {
    font-size: 18px;
    font-weight: 400;
    margin-left: 5px;
  }

  .nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
    align-items: center;
  }

  .nav-menu a {
    text-decoration: none;
    color: var(--accent-blue);
    font-weight: 500;
    font-size: 16px;
    transition: var(--transition);
  }

  .nav-menu a:hover {
    color: var(--primary-blue);
  }

  .cta-button {
    background: var(--primary-blue);
    color: var(--text-light);
    padding: 12px 24px;
    border-radius: 25px;
    text-decoration: none;
    font-weight: 600;
    font-size: 14px;
    transition: var(--transition);
  }

  .cta-button:hover {
    background: var(--accent-blue);
    transform: translateY(-2px);
  }

  .mobile-menu-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    background: none;
    border: none;
    padding: 5px;
    z-index: 1001;
    width: 44px;
    height: 44px;
    padding: 0;
    overflow: visible;
    align-items: center;
    justify-content: center;
  }

  .mobile-menu-toggle span {
    width: 32px;
    height: 3px;
    background: var(--primary-blue);
    margin: 3px 0;
    transition: var(--transition);
    border-radius: 2px;
  }


  @media (max-width: 768px) {
    .header-content {
      position: relative;
    }

    .nav-menu {
      display: none;
      position: absolute;
      top: 100%;
      left: 0;
      width: 100%;
      background: var(--bg-white);
      flex-direction: column;
      padding: 20px;
      box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
      gap: 15px;
      border-radius: 0 0 12px 12px;
      animation: slideDown 0.3s ease-out;
    }

    .nav-menu.active {
      display: flex;
    }

    .nav-menu li {
      width: 100%;
      text-align: center;
    }

    .nav-menu a {
      display: block;
      padding: 12px 0;
      border-bottom: 1px solid rgba(62, 146, 204, 0.1);
      font-size: 16px;
    }

    .nav-menu a:hover {
      background: var(--light-blue);
      border-radius: 8px;
    }

    .mobile-menu-toggle {
      display: flex;
    }

    .hero-content {
      grid-template-columns: 1fr;
      gap: 40px;
      text-align: center;
    }

    .hero-text h1 {
      font-size: 32px;
    }

    .hero-buttons {
      flex-direction: column;
      align-items: center;
    }

    .features h2,
    .services-section h2 {
      font-size: 28px;
    }

    .features-grid,
    .services-grid {
      grid-template-columns: 1fr;
    }

    .testimonials h2 {
      font-size: 28px;
    }

    .testimonials-grid {
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    }

    .contact-content {
      grid-template-columns: 1fr;
      gap: 40px;
    }

    .earth-graphic {
      width: 80px;
      height: 80px;
      font-size: 18px;
    }
  }

  /* Animations */
  @keyframes slideDown {
    from {
      opacity: 0;
      transform: translateY(-10px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }