:root {
      --primary: #2563eb;
      --primary-dark: #1e40af;
      --primary-light: #93c5fd;
      --bg: #f8f9fa;
      --text: #1e293b;
      --text-light: #4b5563;
      --gray: #e5e7eb;
      --gray-dark: #d1d5db;
      --cyber-blue: #00f0ff;
      --white: #ffffff;
      --black: #111827;
      --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
      --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
      --radius: 0.5rem;
      --transition: all 0.3s ease;

}

    /* Dark theme variables */
    [data-theme="dark"] {
      --primary: #3b82f6;
      --primary-dark: #1d4ed8;
      --primary-light: #1e40af;
      --bg: #111827;
      --text: #f9fafb;
      --text-light: #d1d5db;
      --gray: #1f2937;
      --gray-dark: #374151;
      --white: #1f2937;
      --black: #f9fafb;
      --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.25), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
      --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.25);
    }

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

    body {
      font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
      background: var(--bg);
      color: var(--text);
      line-height: 1.6;
      transition: var(--transition);
    }

    h1, h2, h3, h4 {
      font-weight: 700;
      line-height: 1.2;
      margin-bottom: 1rem;
    }

    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
    h3 { font-size: 1.75rem; }
    h4 { font-size: 1.5rem; }

    p {
      color: var(--text-light);
      margin-bottom: 1.5rem;
      font-size: 1.1rem;
    }

    .container {
      width: 100%;
      max-width: 1200px;
      padding: 0 1.5rem;
      margin: 0 auto;
    }

    /* Header & Navigation */
    header {
      background: var(--white);
      padding: 1.25rem 0;
      position: fixed;
      width: 100%;
      top: 0;
      box-shadow: var(--shadow);
      z-index: 1000;
      transition: var(--transition);
    }

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

    .logo {
      font-size: 1.5rem;
      font-weight: 800;
      text-decoration: none;
      color: var(--primary);
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    .logo span {
      color: var(--primary-dark);
    }

    .nav-links {
      display: flex;
      list-style: none;
      align-items: center;
      gap: 2rem;
    }

    .nav-links a {
      text-decoration: none;
      color: var(--text);
      font-weight: 500;
      font-size: 1rem;
      transition: var(--transition);
      position: relative;
    }

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

    .nav-links a::after {
      content: '';
      position: absolute;
      width: 0;
      height: 2px;
      background: var(--primary);
      bottom: -4px;
      left: 0;
      transition: var(--transition);
    }

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

    /* Buttons */
    .btn {
      display: inline-block;
      padding: 0.75rem 1.75rem;
      border-radius: 50px;
      font-weight: 600;
      text-decoration: none;
      cursor: pointer;
      transition: var(--transition);
      text-align: center;
      border: none;
      font-size: 1rem;
    }

    .btn-primary {
      background: var(--primary);
      color: var(--white);
      box-shadow: var(--shadow);
    }

    .btn-primary:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
      box-shadow: var(--shadow-lg);
    }

    .btn-outline {
      background: transparent;
      border: 2px solid var(--primary);
      color: var(--primary);
    }

    .btn-outline:hover {
      background: var(--primary);
      color: var(--white);
    }

    /* Hero Section */
    .hero {
      height: 100vh;
      display: flex;
      align-items: center;
      text-align: center;
      background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)),
        url('https://images.unsplash.com/photo-1504384308090-c894fdcc538d?auto=format&fit=crop&w=1470&q=80') center/cover no-repeat;
      color: var(--white);
      padding: 6rem 0 4rem;
      position: relative;
      color: white;
            
    }

    .hero::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(135deg, rgba(37, 99, 235, 0.8) 0%, rgba(29, 78, 216, 0.9) 100%);
      mix-blend-mode: multiply;
      z-index: -1;
    }

    .hero-content {
      max-width: 800px;
      margin: 0 auto;
      padding: 0 1rem;
    }

    .hero h1 {
      font-size: 3rem;
      margin-bottom: 1.5rem;
      line-height: 1.2;
    }

    .hero p {
      font-size: 1.25rem;
      margin-bottom: 2.5rem;
      color: rgba(255, 255, 255, 0.9);
    }

    /* Sections */
    section {
      padding: 6rem 0;
    }

    .section-title {
      text-align: center;
      margin-bottom: 3rem;
    }

    .section-title h2 {
      position: relative;
      display: inline-block;
      padding-bottom: 1rem;
    }

    .section-title h2::after {
      content: '';
      position: absolute;
      width: 80px;
      height: 4px;
      background: var(--primary);
      bottom: 0;
      left: 50%;
      transform: translateX(-50%);
      border-radius: 2px;
    }

    /* About Features */
    .about-features, .service-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 2rem;
      margin-top: 3rem;
    }

    .feature-card, .service-box {
      background: var(--white);
      border-radius: var(--radius);
      padding: 2.5rem;
      text-align: center;
      box-shadow: var(--shadow);
      transition: var(--transition);
    }

    .feature-card:hover, .service-box:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-lg);
    }

    .feature-card i, .service-box i {
      font-size: 2.5rem;
      color: var(--primary);
      margin-bottom: 1.5rem;
    }

    .feature-card h4, .service-box h4 {
      margin-bottom: 1rem;
    }

    /* Contact Form */
    .contact-form {
      display: grid;
      grid-template-columns: 1fr;
      gap: 1.5rem;
      max-width: 600px;
      margin: 0 auto;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 0.5rem;
    }

    .form-control {
      padding: 1rem;
      border: 1px solid var(--gray-dark);
      border-radius: var(--radius);
      font-size: 1rem;
      background: var(--white);
      color: var(--text);
      transition: var(--transition);
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px var(--primary-light);
    }

    textarea.form-control {
      min-height: 150px;
      resize: vertical;
    }

    /* Footer */
    footer {
      background: var(--black);
      color: var(--white);
      padding: 3rem 0;
      text-align: center;
    }

    .footer-content {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 2rem;
      margin-bottom: 2rem;
      text-align: left;
    }

    .footer-column h3 {
      color: var(--white);
      margin-bottom: 1.5rem;
      position: relative;
      padding-bottom: 0.75rem;
    }

    .footer-column h3::after {
      content: '';
      position: absolute;
      width: 50px;
      height: 3px;
      background: var(--primary);
      bottom: 0;
      left: 0;
    }

    .footer-links {
      list-style: none;
    }

    .footer-links li {
      margin-bottom: 0.75rem;
    }

    .footer-links a {
      color: var(--text-light);
      text-decoration: none;
      transition: var(--transition);
    }

    .footer-links a:hover {
      color: var(--primary);
      padding-left: 5px;
    }

    .social-links {
      display: flex;
      gap: 1rem;
      margin-top: 1.5rem;
    }

    .social-links a {
      display: flex;
      align-items: center;
      justify-content: center;
      width: 40px;
      height: 40px;
      background: rgba(255, 255, 255, 0.1);
      border-radius: 50%;
      color: var(--white);
      transition: var(--transition);
    }

    .social-links a:hover {
      background: var(--primary);
      transform: translateY(-3px);
    }

    .copyright {
      padding-top: 2rem;
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      color: var(--text-light);
      font-size: 0.9rem;
    }

    /* Theme Toggle */
    .theme-toggle {
      background: var(--gray);
      border: none;
      color: var(--text);
      width: 40px;
      height: 40px;
      border-radius: 50%;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-left: 1rem;
      transition: var(--transition);
    }

    .theme-toggle:hover {
      background: var(--primary);
      color: var(--white);
    }

    /* Mobile Menu */
    .mobile-menu {
      display: none;
      font-size: 1.5rem;
      cursor: pointer;
      color: var(--text);
    }

    /* Responsive Design */
    @media (max-width: 992px) {
      h1 { font-size: 2.25rem; }
      h2 { font-size: 1.75rem; }
      
      .hero h1 {
        font-size: 2.5rem;
      }
      
      .hero p {
        font-size: 1.1rem;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 80px);
        background: var(--white);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 2rem;
        transition: var(--transition);
        z-index: 999;
      }

      .nav-links.active {
        left: 0;
      }

      .mobile-menu {
        display: block;
      }

      .hero {
        padding: 5rem 0 3rem;
      }

      .hero h1 {
        font-size: 2rem;
      }

      section {
        padding: 4rem 0;
      }
    }

    @media (max-width: 576px) {
      .btn {
        padding: 0.75rem 1.5rem;
        font-size: 0.9rem;
      }

      .feature-card, .service-box {
        padding: 1.5rem;
      }

      .contact-form {
        gap: 1rem;
      }
    }