:root {
      --primary-color: #3b82f6;
      --primary-dark: #2563eb;
      --secondary-color: #1f2937;
      --accent-color: #10b981;
      --text-primary: #1f2937;
      --text-secondary: #6b7280;
      --bg-primary: #ffffff;
      --bg-secondary: #f9fafb;
      --bg-tertiary: #f3f4f6;
      --border-color: #e5e7eb;
      --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
      --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    }

    [data-theme="dark"] {
      --text-primary: #f9fafb;
      --text-secondary: #d1d5db;
      --bg-primary: #111827;
      --bg-secondary: #1f2937;
      --bg-tertiary: #374151;
      --border-color: #374151;
      --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
      --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
    }

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

    body {
      font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
      line-height: 1.6;
      color: var(--text-primary);
      background-color: var(--bg-primary);
      transition: background-color 0.3s ease, color 0.3s ease;
    }

    /* Navigation */
    .navbar {
      position: fixed;
      top: 0;
      width: 100%;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      z-index: 1000;
      transition: all 0.3s ease;
    }

    [data-theme="dark"] .navbar {
      background: rgba(17, 24, 39, 0.95);
    }

    .nav-container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 70px;
    }

    .logo {
      font-size: 24px;
      font-weight: bold;
      color: var(--primary-color);
      text-decoration: none;
    }

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

    .nav-link {
      text-decoration: none;
      color: var(--text-primary);
      font-weight: 500;
      transition: color 0.3s ease;
      position: relative;
    }

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

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -5px;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary-color);
      transition: width 0.3s ease;
    }

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

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 15px;
    }

    .theme-toggle {
      background: none;
      border: 2px solid var(--border-color);
      border-radius: 50px;
      padding: 8px 12px;
      cursor: pointer;
      color: var(--text-primary);
      transition: all 0.3s ease;
    }

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

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-primary);
      cursor: pointer;
    }

    /* Hero Section */
    .hero {
      padding: 120px 20px 80px;
      background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
      text-align: center;
      position: relative;
      overflow: hidden;
    }

    .hero::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 1000"><defs><radialGradient id="a" cx="50%" cy="50%" r="50%"><stop offset="0%" stop-color="%233b82f6" stop-opacity="0.1"/><stop offset="100%" stop-color="%233b82f6" stop-opacity="0"/></radialGradient></defs><circle cx="200" cy="200" r="100" fill="url(%23a)"/><circle cx="800" cy="300" r="150" fill="url(%23a)"/><circle cx="600" cy="700" r="120" fill="url(%23a)"/></svg>') center/cover;
      opacity: 0.5;
    }

    .hero-content {
      max-width: 800px;
      margin: 0 auto;
      position: relative;
      z-index: 1;
    }

    .hero h1 {
      font-size: clamp(2.5rem, 5vw, 4rem);
      font-weight: 700;
      margin-bottom: 20px;
      background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .hero p {
      font-size: 1.2rem;
      color: var(--text-secondary);
      margin-bottom: 30px;
      max-width: 600px;
      margin-left: auto;
      margin-right: auto;
    }

    .cta-buttons {
      display: flex;
      gap: 20px;
      justify-content: center;
      flex-wrap: wrap;
      margin-top: 40px;
    }

    .btn {
      padding: 15px 30px;
      border-radius: 50px;
      font-size: 16px;
      font-weight: 600;
      text-decoration: none;
      transition: all 0.3s ease;
      cursor: pointer;
      border: none;
      display: inline-flex;
      align-items: center;
      gap: 10px;
    }

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

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

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

    .btn-secondary:hover {
      border-color: var(--primary-color);
      color: var(--primary-color);
    }

    /* Section Styles */
    .section {
      padding: 80px 20px;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
    }

    .section-header {
      text-align: center;
      margin-bottom: 60px;
    }

    .section-title {
      font-size: 2.5rem;
      font-weight: 700;
      margin-bottom: 15px;
      color: var(--text-primary);
    }

    .section-subtitle {
      font-size: 1.1rem;
      color: var(--text-secondary);
      max-width: 600px;
      margin: 0 auto;
    }

    /* Features Section */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 30px;
      margin-top: 50px;
    }

    .feature-card {
      background: var(--bg-primary);
      border-radius: 20px;
      padding: 40px 30px;
      text-align: center;
      box-shadow: var(--shadow);
      transition: all 0.3s ease;
      border: 1px solid var(--border-color);
    }

    .feature-card:hover {
      transform: translateY(-10px);
      box-shadow: var(--shadow-lg);
    }

    .feature-icon {
      width: 80px;
      height: 80px;
      margin: 0 auto 20px;
      background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 40px;
      color: white;
    }

    .feature-card h3 {
      font-size: 1.3rem;
      margin-bottom: 15px;
      color: var(--text-primary);
    }

    .feature-card p {
      color: var(--text-secondary);
      line-height: 1.6;
    }

    /* Products Section */
    .products {
      background: var(--bg-secondary);
    }

    .products-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
      gap: 40px;
    }

    .product-card {
      background: var(--bg-primary);
      border-radius: 20px;
      padding: 40px;
      box-shadow: var(--shadow);
      transition: all 0.3s ease;
      border: 1px solid var(--border-color);
    }

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

    .product-price {
      font-size: 2rem;
      font-weight: 700;
      color: var(--primary-color);
      margin-bottom: 10px;
    }

    .product-card h3 {
      font-size: 1.5rem;
      margin-bottom: 15px;
      color: var(--text-primary);
    }

    .product-features {
      list-style: none;
      margin: 20px 0;
    }

    .product-features li {
      padding: 8px 0;
      color: var(--text-secondary);
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .product-features li::before {
      content: '✓';
      color: var(--accent-color);
      font-weight: bold;
    }

    /* About Section */
    .about-content {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .about-text h2 {
      font-size: 2.2rem;
      margin-bottom: 20px;
      color: var(--text-primary);
    }

    .about-text p {
      color: var(--text-secondary);
      margin-bottom: 20px;
      line-height: 1.7;
    }

    .about-stats {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
      margin-top: 40px;
    }

    .stat-item {
      text-align: center;
      padding: 20px;
      background: var(--bg-secondary);
      border-radius: 15px;
    }

    .stat-number {
      font-size: 2.5rem;
      font-weight: 700;
      color: var(--primary-color);
      display: block;
    }

    .stat-label {
      color: var(--text-secondary);
      font-size: 0.9rem;
    }

    .about-image {
      position: relative;
    }

    .about-image img {
      width: 100%;
      border-radius: 20px;
      box-shadow: var(--shadow-lg);
    }

    /* Contact Section */
    .contact {
      background: var(--bg-secondary);
    }

    .contact-content {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
    }

    .contact-info h3 {
      font-size: 1.5rem;
      margin-bottom: 20px;
      color: var(--text-primary);
    }

    .contact-item {
      display: flex;
      align-items: center;
      gap: 15px;
      margin-bottom: 20px;
      padding: 15px;
      background: var(--bg-primary);
      border-radius: 10px;
      transition: all 0.3s ease;
    }

    .contact-item:hover {
      transform: translateX(5px);
    }

    .contact-icon {
      width: 50px;
      height: 50px;
      background: var(--primary-color);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      font-size: 20px;
    }

    .contact-details a {
      color: var(--text-primary);
      text-decoration: none;
      transition: color 0.3s ease;
    }

    .contact-details a:hover {
      color: var(--primary-color);
    }

    .contact-form {
      background: var(--bg-primary);
      padding: 40px;
      border-radius: 20px;
      box-shadow: var(--shadow);
    }

    .form-group {
      margin-bottom: 20px;
    }

    .form-group label {
      display: block;
      margin-bottom: 5px;
      font-weight: 600;
      color: var(--text-primary);
    }

    .form-group input,
    .form-group textarea {
      width: 100%;
      padding: 12px 15px;
      border: 2px solid var(--border-color);
      border-radius: 10px;
      background: var(--bg-primary);
      color: var(--text-primary);
      transition: border-color 0.3s ease;
    }

    .form-group input:focus,
    .form-group textarea:focus {
      outline: none;
      border-color: var(--primary-color);
    }

    .form-group textarea {
      height: 120px;
      resize: vertical;
    }

    /* Footer */
    .footer {
      background: var(--secondary-color);
      color: white;
      padding: 60px 20px 20px;
    }

    .footer-content {
      max-width: 1200px;
      margin: 0 auto;
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 40px;
    }

    .footer-section h3 {
      margin-bottom: 20px;
      color: white;
    }

    .footer-section p,
    .footer-section a {
      color: #d1d5db;
      text-decoration: none;
      line-height: 1.6;
    }

    .footer-section a:hover {
      color: var(--primary-color);
    }

    .social-links {
      display: flex;
      gap: 15px;
      margin-top: 20px;
    }

    .social-links a {
      width: 40px;
      height: 40px;
      background: var(--primary-color);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: white;
      transition: all 0.3s ease;
    }

    .social-links a:hover {
      background: var(--primary-dark);
      transform: translateY(-2px);
    }

    .footer-bottom {
      border-top: 1px solid #374151;
      margin-top: 40px;
      padding-top: 20px;
      text-align: center;
      color: #9ca3af;
    }

    /* Responsive Design */
    @media (max-width: 768px) {
      .mobile-menu-btn {
        display: block;
      }

      .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--bg-primary);
        flex-direction: column;
        padding: 20px;
        box-shadow: var(--shadow);
      }

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

      .hero {
        padding: 100px 20px 60px;
      }

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

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

      .about-stats {
        grid-template-columns: 1fr;
      }

      .section-title {
        font-size: 2rem;
      }

      .products-grid {
        grid-template-columns: 1fr;
      }
    }

    /* Animations */
    @keyframes fadeInUp {
      from {
        opacity: 0;
        transform: translateY(30px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    .fade-in-up {
      animation: fadeInUp 0.6s ease-out;
    }

    /* Smooth scrolling */
    html {
      scroll-behavior: smooth;
    }

    /* Loading animation */
    .loading {
      opacity: 0;
      transform: translateY(20px);
      transition: all 0.6s ease;
    }

    .loading.loaded {
      opacity: 1;
      transform: translateY(0);
    }