:root {
    --primary: #1E3A8A;
    --secondary: #6B7280;
    --accent: #10B981;
    --highlight: #F59E0B;
    --light: #FFFFFF;
    --gray: #D1D5DB;
    --dark: #111827;
  }

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

  @font-face {
    font-family: 'Roboto';
    src: local('Roboto'), local('Roboto-Regular');
    font-weight: 400;
  }

  @font-face {
    font-family: 'Montserrat';
    src: local('Montserrat'), local('Montserrat-Regular');
    font-weight: 400;
  }

  body {
    font-family: 'Roboto', sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    line-height: 1.6;
    color: var(--light);
    background: linear-gradient(135deg, rgba(30, 58, 138, 0.9), rgba(107, 114, 128, 0.9));
    background-attachment: fixed;
    min-height: 100%;
  }

  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
  }

  .hero {
    height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    overflow: hidden;
  }

  .hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('https://images.gptkong.com/demo/sample1.png') center/cover no-repeat;
    opacity: 0.3;
    z-index: -1;
  }

  .hero-content {
    max-width: 800px;
    padding: 40px;
    background: rgba(30, 58, 138, 0.7);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  }

  h1, h2, h3, h4 {
    font-family: 'Montserrat', sans-serif;
    margin-bottom: 20px;
    font-weight: 600;
  }

  h1 {
    font-size: 3rem;
    background: linear-gradient(90deg, var(--light), var(--accent));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    animation: textGradient 8s ease infinite;
    background-size: 200% 200%;
  }

  h2 {
    font-size: 2.2rem;
    color: var(--light);
    position: relative;
    padding-bottom: 15px;
    margin-top: 60px;
  }

  h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--accent), var(--highlight));
    border-radius: 2px;
  }

  p {
    font-size: 1.1rem;
    margin-bottom: 20px;
    line-height: 1.8;
  }

  .notice {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    padding: 15px 25px;
    border-radius: 50px;
    font-size: 0.9rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    animation: float 3s ease-in-out infinite;
  }

  .grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin: 60px 0;
  }

  .card {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 15px;
    padding: 30px;
    backdrop-filter: blur(10px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
  }

  .card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
  }

  .card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    transform: rotate(45deg);
    transition: all 0.6s ease;
    opacity: 0;
  }

  .card:hover::before {
    animation: shine 1.5s;
  }

  .card-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 10px;
    margin-bottom: 20px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
  }

  .card-img:hover {
    transform: scale(1.03);
  }

  .code-container {
    background: rgba(30, 41, 59, 0.8);
    border-radius: 10px;
    padding: 20px;
    margin: 30px 0;
    overflow-x: auto;
    box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.3);
  }

  pre {
    margin: 0;
    font-family: 'Roboto Mono', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--gray);
  }

  code {
    font-family: 'Roboto Mono', monospace;
    background: rgba(0, 0, 0, 0.2);
    padding: 2px 5px;
    border-radius: 3px;
  }

  table {
    width: 100%;
    border-collapse: collapse;
    margin: 30px 0;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 10px;
    overflow: hidden;
  }

  th, td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

  th {
    background: rgba(30, 58, 138, 0.5);
    font-weight: 600;
  }

  tr:hover {
    background: rgba(255, 255, 255, 0.05);
  }

  .color-chip {
    display: inline-block;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    margin-right: 10px;
    vertical-align: middle;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
  }

  .parallax {
    height: 60vh;
    background-attachment: fixed;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    position: relative;
    margin: 60px 0;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .parallax::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
  }

  .parallax-content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 40px;
    max-width: 800px;
  }

  .features {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 15px;
  }

  .feature-tag {
    background: rgba(16, 185, 129, 0.2);
    color: var(--accent);
    padding: 5px 10px;
    border-radius: 20px;
    font-size: 0.8rem;
    border: 1px solid rgba(16, 185, 129, 0.3);
  }

  @keyframes textGradient {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
  }

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

  @keyframes shine {
    0% { opacity: 0; left: -100%; }
    20% { opacity: 0.5; }
    100% { opacity: 0; left: 100%; }
  }

  @media (max-width: 768px) {
    h1 {
      font-size: 2rem;
    }
    h2 {
      font-size: 1.8rem;
    }
    .hero {
      height: 60vh;
    }
    .grid {
      grid-template-columns: 1fr;
    }
  }