:root {
    --primary: #1e3c72;
    --secondary: #2a5298;
    --accent: #00e676;
    --text: #ffffff;
    --glass: rgba(255, 255, 255, 0.1);
    --shadow: 0 8px 32px rgba(31, 38, 135, 0.37);
  }

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

  body {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--text);
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    min-height: 100%;
    overflow-x: hidden;
  }

  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
  }

  .header {
    text-align: center;
    padding: 3rem 0;
    position: relative;
  }

  .header::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('https://images.gptkong.com/demo/sample1.png') center/cover;
    opacity: 0.2;
    z-index: -1;
    border-radius: 0 0 50% 50%;
  }

  .header h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
    background: linear-gradient(90deg, #fff, #00e676);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }

  .notice {
    background: var(--glass);
    backdrop-filter: blur(10px);
    padding: 1rem;
    border-radius: 10px;
    margin: 2rem auto;
    max-width: 800px;
    text-align: center;
    box-shadow: var(--shadow);
    border: 1px solid rgba(255, 255, 255, 0.2);
  }

  article {
    background: var(--glass);
    backdrop-filter: blur(15px);
    padding: 3rem;
    border-radius: 20px;
    margin: 2rem 0;
    box-shadow: var(--shadow);
  }

  article h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--accent);
    position: relative;
    padding-bottom: 0.5rem;
  }

  article h2::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), transparent);
  }

  article h3 {
    font-size: 1.5rem;
    margin: 1.5rem 0 1rem;
    color: #00c853;
  }

  article p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
  }

  pre {
    background: rgba(0, 0, 0, 0.3);
    border-radius: 10px;
    padding: 1.5rem;
    margin: 1.5rem 0;
    overflow: auto;
    border-left: 3px solid var(--accent);
  }

  code {
    font-family: 'Courier New', monospace;
    color: #00e676;
  }

  .gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
  }

  .gallery img {
    width: 100%;
    height: auto;
    border-radius: 15px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s, box-shadow 0.3s;
  }

  .gallery img:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.4);
  }

  .nav-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin: 2rem 0;
  }

  .nav-link {
    padding: 0.8rem 1.5rem;
    background: linear-gradient(45deg, var(--accent), #00c853);
    border-radius: 25px;
    color: white;
    text-decoration: none;
    font-weight: bold;
    transition: transform 0.3s, box-shadow 0.3s;
    box-shadow: 0 4px 15px rgba(0, 200, 83, 0.3);
  }

  .nav-link:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 200, 83, 0.5);
  }

  @media (max-width: 768px) {
    .container {
      padding: 1rem;
    }
    
    article {
      padding: 2rem 1.5rem;
    }
    
    .header h1 {
      font-size: 2rem;
    }
  }

  .particle {
    position: fixed;
    width: 2px;
    height: 2px;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    pointer-events: none;
    z-index: -1;
    animation: float 15s infinite linear;
  }

  @keyframes float {
    0% {
      transform: translate(0, 0);
      opacity: 0;
    }
    50% {
      opacity: 1;
    }
    100% {
      transform: translate(100vw, 100vh);
      opacity: 0;
    }
  }

  .card {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 1.5rem;
    margin: 1.5rem 0;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s, box-shadow 0.3s;
    border: 1px solid rgba(255, 255, 255, 0.1);
  }

  .card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
  }