:root {
      --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
      --accent-color: #667eea;
      --accent-hover: #5568d3;
      --dark-bg: #0a0e1a;
      --card-bg: rgba(15, 23, 42, 0.8);
      --border-color: rgba(102, 126, 234, 0.2);
      --text-muted: #94a3b8;
      --glow-color: rgba(102, 126, 234, 0.4);
    }

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

    body { 
      font-family: 'Space Grotesk', system-ui, -apple-system, sans-serif; 
      scroll-behavior: smooth;
      background: var(--dark-bg);
      color: #e2e8f0;
      overflow-x: hidden;
    }

    /* Animated background */
    body::before {
      content: '';
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: 
        radial-gradient(circle at 20% 50%, rgba(102, 126, 234, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(118, 75, 162, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 50% 20%, rgba(245, 87, 108, 0.05) 0%, transparent 50%);
      pointer-events: none;
      z-index: -1;
      animation: bgFloat 20s ease-in-out infinite;
    }

    @keyframes bgFloat {
      0%, 100% { opacity: 0.3; transform: scale(1); }
      50% { opacity: 0.5; transform: scale(1.1); }
    }

    /* Navbar */
    .navbar { 
      backdrop-filter: blur(20px) saturate(180%);
      background: rgba(10, 14, 26, 0.8);
      border-bottom: 1px solid var(--border-color);
      padding: 1rem 0;
      transition: all 0.3s ease;
    }

    .navbar-brand {
      font-weight: 700;
      font-size: 1.5rem;
      letter-spacing: -0.5px;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    .navbar-brand i {
      font-size: 1.8rem;
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      filter: drop-shadow(0 0 8px var(--glow-color));
    }

    .nav-link {
      font-weight: 500;
      color: var(--text-muted) !important;
      transition: all 0.3s ease;
      position: relative;
      padding: 0.5rem 1rem !important;
    }

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

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

    .nav-link:hover::after {
      width: 80%;
    }

    /* Theme Toggle */
    .theme-toggle { 
      position: fixed; 
      top: 1.2rem; 
      right: 1.2rem; 
      z-index: 1000;
      border: 2px solid var(--border-color);
      background: var(--card-bg);
      backdrop-filter: blur(10px);
      border-radius: 50%;
      width: 50px;
      height: 50px;
      display: flex;
      align-items: center;
      justify-content: center;
      transition: all 0.3s ease;
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    }

    .theme-toggle:hover {
      transform: scale(1.1) rotate(15deg);
      border-color: var(--accent-color);
      box-shadow: 0 4px 30px var(--glow-color);
    }

    /* Hero Section */
    .hero { 
      min-height: 95vh; 
      display: flex;
      align-items: center;
      justify-content: center;
      text-align: center; 
      padding: 6rem 2rem 4rem;
      position: relative;
      overflow: hidden;
    }

    .hero::before {
      content: '';
      position: absolute;
      top: -50%;
      left: 50%;
      transform: translateX(-50%);
      width: 800px;
      height: 800px;
      background: radial-gradient(circle, var(--glow-color) 0%, transparent 70%);
      opacity: 0.6;
      animation: pulse 4s ease-in-out infinite;
    }

    @keyframes pulse {
      0%, 100% { transform: translateX(-50%) scale(1); opacity: 0.6; }
      50% { transform: translateX(-50%) scale(1.2); opacity: 0.4; }
    }

    .hero .container {
      position: relative;
      z-index: 1;
    }

    .hero h1 {
      font-size: clamp(3rem, 8vw, 5.5rem);
      font-weight: 700;
      line-height: 1.1;
      margin-bottom: 1.5rem;
      letter-spacing: -2px;
    }

    .hero h1 .text-primary {
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      position: relative;
      display: inline-block;
    }

    .hero h1 .text-primary::after {
      content: '';
      position: absolute;
      bottom: -10px;
      left: 0;
      width: 100%;
      height: 4px;
      background: var(--primary-gradient);
      border-radius: 2px;
      animation: underlineGrow 1s ease-out;
    }

    @keyframes underlineGrow {
      from { width: 0; }
      to { width: 100%; }
    }

    .hero .lead {
      font-size: clamp(1.1rem, 2.5vw, 1.5rem);
      color: var(--text-muted);
      max-width: 700px;
      margin: 0 auto 2rem;
      line-height: 1.6;
    }

    .price { 
      font-size: clamp(3rem, 6vw, 4.5rem); 
      font-weight: 800; 
      background: var(--secondary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      margin: 2rem 0;
      display: inline-block;
      position: relative;
      animation: priceFloat 3s ease-in-out infinite;
    }

    @keyframes priceFloat {
      0%, 100% { transform: translateY(0); }
      50% { transform: translateY(-10px); }
    }

    .price small {
      color: var(--text-muted);
      font-size: 0.4em;
      font-weight: 500;
    }

    /* Buttons */
    .btn {
      font-weight: 600;
      border-radius: 12px;
      padding: 0.875rem 2rem;
      transition: all 0.3s ease;
      border: 2px solid transparent;
      position: relative;
      overflow: hidden;
    }

    .btn-primary {
      background: var(--primary-gradient);
      border: none;
      color: #fff;
      box-shadow: 0 10px 30px rgba(102, 126, 234, 0.3);
    }

    .btn-primary::before {
      content: '';
      position: absolute;
      top: 0;
      left: -100%;
      width: 100%;
      height: 100%;
      background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
      transition: left 0.5s ease;
    }

    .btn-primary:hover::before {
      left: 100%;
    }

    .btn-primary:hover {
      transform: translateY(-3px);
      box-shadow: 0 15px 40px rgba(102, 126, 234, 0.5);
    }

    .btn-outline-light {
      border: 2px solid var(--border-color);
      color: #fff;
      background: transparent;
      backdrop-filter: blur(10px);
    }

    .btn-outline-light:hover {
      background: var(--card-bg);
      border-color: var(--accent-color);
      transform: translateY(-3px);
      box-shadow: 0 10px 30px rgba(102, 126, 234, 0.2);
    }

    .hero .d-flex {
      margin-top: 3rem;
    }

    .hero > .container > p:last-child {
      margin-top: 3rem;
      font-size: 0.95rem;
      color: var(--text-muted);
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 1.5rem;
      flex-wrap: wrap;
    }

    /* Features Section */
    #features {
      padding: 6rem 0;
    }

    #features .card {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: 24px;
      box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
      backdrop-filter: blur(20px);
      transition: all 0.4s ease;
      overflow: hidden;
      position: relative;
    }

    #features .card::before {
      content: '';
      position: absolute;
      top: 0;
      left: -100%;
      width: 100%;
      height: 100%;
      background: linear-gradient(90deg, transparent, rgba(102, 126, 234, 0.1), transparent);
      transition: left 0.6s ease;
    }

    #features .card:hover::before {
      left: 100%;
    }

    #features .card:hover {
      transform: translateY(-10px);
      border-color: var(--accent-color);
      box-shadow: 0 30px 80px rgba(102, 126, 234, 0.3);
    }

    #features .card-body {
      padding: 3rem;
    }

    #features h2 {
      font-size: 2rem;
      font-weight: 700;
      margin-bottom: 2rem;
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .product-description { 
      list-style: none; 
      padding: 0; 
      margin: 0; 
    }
    
    .product-description li { 
      display: flex; 
      justify-content: space-between; 
      align-items: center;
      gap: 1.5rem; 
      padding: 1.25rem 0; 
      border-bottom: 1px solid var(--border-color);
      transition: all 0.3s ease;
    }

    .product-description li:hover {
      padding-left: 1rem;
      background: rgba(102, 126, 234, 0.05);
      border-radius: 8px;
      border-bottom-color: var(--accent-color);
    }

    .product-description li span:first-child {
      color: var(--text-muted);
      font-weight: 500;
    }

    .product-description li .value {
      color: #fff;
      font-weight: 600;
      background: rgba(102, 126, 234, 0.1);
      padding: 0.5rem 1rem;
      border-radius: 8px;
      border: 1px solid var(--border-color);
    }

    /* Comparison Section */
    #compare {
      padding: 6rem 0;
      background: rgba(15, 23, 42, 0.3);
    }

    #compare h2 {
      font-size: clamp(2rem, 5vw, 3rem);
      font-weight: 700;
      margin-bottom: 3rem;
      background: var(--secondary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .table-responsive {
      border-radius: 20px;
      overflow: hidden;
      box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    }

    .comparison-table { 
      margin: 0;
      background: var(--card-bg);
      backdrop-filter: blur(20px);
    }

    .comparison-table td, .comparison-table th { 
      vertical-align: middle; 
      text-align: center; 
      white-space: nowrap;
      padding: 1.25rem;
      border-color: var(--border-color);
    }

    .comparison-table thead {
      background: var(--primary-gradient);
    }

    .comparison-table thead th {
      font-weight: 600;
      color: #fff;
      text-transform: uppercase;
      font-size: 0.85rem;
      letter-spacing: 1px;
    }

    .comparison-table tbody tr {
      transition: all 0.3s ease;
    }

    .comparison-table tbody tr:hover {
      background: rgba(102, 126, 234, 0.1);
      transform: scale(1.01);
    }

    .comparison-table .text-success {
      color: #10b981 !important;
      font-weight: 700;
      font-size: 1.2rem;
    }

    #compare p.small {
      margin-top: 2rem;
      color: var(--text-muted);
    }

    #compare p.small a {
      color: var(--accent-color);
      text-decoration: none;
      border-bottom: 1px solid transparent;
      transition: border-color 0.3s ease;
    }

    #compare p.small a:hover {
      border-bottom-color: var(--accent-color);
    }

    /* Modal */
    .modal-content {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: 20px;
      backdrop-filter: blur(20px);
      box-shadow: 0 30px 90px rgba(0, 0, 0, 0.7);
    }

    .modal-header {
      border-bottom: 1px solid var(--border-color);
      padding: 1.5rem 2rem;
    }

    .modal-title {
      font-weight: 700;
      font-size: 1.5rem;
      background: var(--primary-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .modal-body {
      padding: 2rem;
    }

    .form-label {
      font-weight: 600;
      color: var(--text-muted);
      margin-bottom: 0.5rem;
    }

    .form-control {
      background: rgba(15, 23, 42, 0.6);
      border: 1px solid var(--border-color);
      border-radius: 10px;
      color: #fff;
      padding: 0.75rem 1rem;
      transition: all 0.3s ease;
    }

    .form-control:focus {
      background: rgba(15, 23, 42, 0.8);
      border-color: var(--accent-color);
      box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.2);
      color: #fff;
    }

    .btn-group .btn-outline-primary {
      border-color: var(--border-color);
      color: var(--text-muted);
      transition: all 0.3s ease;
    }

    .btn-group .btn-check:checked + .btn-outline-primary {
      background: var(--primary-gradient);
      border-color: var(--accent-color);
      color: #fff;
    }

    .btn-success {
      background: linear-gradient(135deg, #10b981 0%, #059669 100%);
      border: none;
      color: #fff;
      font-weight: 700;
      box-shadow: 0 10px 30px rgba(16, 185, 129, 0.3);
    }

    .btn-success:hover {
      transform: translateY(-3px);
      box-shadow: 0 15px 40px rgba(16, 185, 129, 0.5);
    }

    /* Footer */
    footer { 
      border-top: 1px solid var(--border-color);
      padding: 2rem 0; 
      text-align: center; 
      font-size: 0.95rem;
      background: rgba(10, 14, 26, 0.5);
      backdrop-filter: blur(10px);
    }

    footer p {
      color: var(--text-muted);
    }

    /* Responsive */
    @media (max-width: 768px) {
      .hero {
        min-height: 85vh;
        padding: 5rem 1.5rem 3rem;
      }

      .hero h1 {
        font-size: 2.5rem;
      }

      #features .card-body {
        padding: 2rem 1.5rem;
      }

      .product-description li { 
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
      }

      .comparison-table {
        font-size: 0.85rem;
      }

      .comparison-table td, .comparison-table th {
        padding: 0.75rem 0.5rem;
      }
    }

    @media (max-width: 576px) { 
      .product-description li span:first-child { 
        max-width: 100%; 
      }

      .theme-toggle {
        width: 45px;
        height: 45px;
      }

      .btn {
        padding: 0.75rem 1.5rem;
      }
    }

    /* Spinner styling */
    .spinner-border {
      color: var(--accent-color);
    }

    /* Custom scrollbar */
    ::-webkit-scrollbar {
      width: 10px;
    }

    ::-webkit-scrollbar-track {
      background: var(--dark-bg);
    }

    ::-webkit-scrollbar-thumb {
      background: var(--primary-gradient);
      border-radius: 5px;
    }

    ::-webkit-scrollbar-thumb:hover {
      background: var(--accent-hover);
    }