:root {
    --primary-color: #1e3c72;
    --secondary-color: #2a5298;
    --accent-color: #5b247a;
    --highlight-color: #00c6ff;
    --text-color: #ffffff;
    --text-secondary: #c0c0c0;
    --card-bg: rgba(255, 255, 255, 0.1);
    --card-border: rgba(255, 255, 255, 0.18);
    --shadow-color: rgba(31, 38, 135, 0.37);
  }

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

  body {
    font-family: 'Roboto', sans-serif;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color), var(--accent-color));
    background-size: 400% 400%;
    animation: gradientAnimation 15s ease infinite;
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100%;
    overflow-x: hidden;
  }

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

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

  .navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    padding: 15px 30px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .navbar-logo {
    font-size: 24px;
    font-weight: bold;
    background: linear-gradient(90deg, var(--highlight-color), #0072ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  .navbar-links {
    display: flex;
    gap: 20px;
  }

  .navbar a {
    color: var(--text-color);
    text-decoration: none;
    transition: color 0.3s ease;
    font-weight: 500;
  }

  .navbar a:hover {
    color: var(--highlight-color);
  }

  .hero {
    height: 80vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding-top: 80px;
    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') no-repeat center center/cover;
    opacity: 0.2;
    z-index: -1;
  }

  .hero-title {
    font-size: 48px;
    margin-bottom: 20px;
    background: linear-gradient(90deg, var(--highlight-color), #0072ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  .hero-subtitle {
    font-size: 20px;
    max-width: 700px;
    margin-bottom: 40px;
    color: var(--text-secondary);
  }

  .notice {
    background: rgba(0, 0, 0, 0.3);
    padding: 15px;
    border-radius: 8px;
    margin: 20px 0;
    text-align: center;
    border-left: 4px solid var(--highlight-color);
  }

  .content-section {
    padding: 80px 0;
    position: relative;
  }

  .section-title {
    font-size: 36px;
    margin-bottom: 40px;
    text-align: center;
    background: linear-gradient(90deg, var(--highlight-color), #0072ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
  }

  .article-content {
    background: rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 40px;
    margin-bottom: 40px;
    box-shadow: 0 8px 32px 0 var(--shadow-color);
    border: 1px solid var(--card-border);
  }

  .article-content h2 {
    font-size: 28px;
    margin: 30px 0 20px;
    color: var(--highlight-color);
  }

  .article-content h3 {
    font-size: 22px;
    margin: 25px 0 15px;
    color: var(--highlight-color);
  }

  .article-content p {
    margin-bottom: 20px;
    font-size: 16px;
  }

  pre {
    background: rgba(0, 0, 0, 0.5);
    border-radius: 8px;
    padding: 20px;
    margin: 20px 0;
    overflow-x: auto;
    font-family: 'Courier New', monospace;
    border-left: 4px solid var(--highlight-color);
  }

  code {
    font-family: 'Courier New', monospace;
    color: var(--highlight-color);
  }

  .card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
    margin: 40px 0;
  }

  .card {
    background: var(--card-bg);
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 8px 32px 0 var(--shadow-color);
    backdrop-filter: blur(8.5px);
    border: 1px solid var(--card-border);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }

  .card:hover {
    transform: translateY(-10px);
    box-shadow: 0 16px 64px 0 var(--shadow-color);
  }

  .card-title {
    font-size: 20px;
    margin-bottom: 15px;
    color: var(--highlight-color);
  }

  .card-description {
    color: var(--text-secondary);
    font-size: 14px;
  }

  .image-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
    margin: 40px 0;
  }

  .gallery-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 10px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }

  .gallery-image:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.3);
  }

  .footer {
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    padding: 30px 0;
    text-align: center;
    margin-top: 80px;
  }

  .footer-text {
    color: var(--text-secondary);
    font-size: 14px;
  }

  @media (max-width: 768px) {
    .navbar {
      flex-direction: column;
      padding: 15px;
    }

    .navbar-links {
      margin-top: 15px;
    }

    .hero-title {
      font-size: 32px;
    }

    .hero-subtitle {
      font-size: 16px;
    }

    .section-title {
      font-size: 28px;
    }

    .article-content {
      padding: 20px;
    }

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