:root {
    --primary: #0f2027;
    --secondary: #2c5364;
    --accent: #00c6ff;
    --text: #ffffff;
    --card-bg: rgba(30, 60, 114, 0.8);
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  }

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

  @font-face {
    font-family: 'Roboto';
    src: url('https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;700&display=swap');
  }

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

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

  .header {
    position: relative;
    height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: radial-gradient(circle at center, rgba(16, 32, 39, 0.8), rgba(16, 32, 39, 0.9));
    overflow: hidden;
  }

  .header::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: 0.15;
    z-index: -1;
  }

  .header-content {
    max-width: 800px;
    padding: 40px;
    background: rgba(30, 60, 114, 0.5);
    border-radius: 20px;
    backdrop-filter: blur(10px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    transform: translateY(20px);
    animation: fadeIn 1s ease-out forwards;
  }

  @keyframes fadeIn {
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  h1, h2, h3, h4 {
    margin-bottom: 1.5rem;
    font-weight: 500;
    line-height: 1.2;
  }

  h1 {
    font-size: 3rem;
    background: linear-gradient(90deg, var(--accent), #ffffff);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 1rem;
  }

  h2 {
    font-size: 2.2rem;
    color: var(--accent);
    position: relative;
    padding-bottom: 10px;
  }

  h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 80px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), transparent);
  }

  h3 {
    font-size: 1.8rem;
    color: #a3d8ff;
  }

  h4 {
    font-size: 1.4rem;
    color: #a3d8ff;
  }

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

  .note {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: rgba(0, 198, 255, 0.2);
    padding: 10px 20px;
    border-radius: 30px;
    backdrop-filter: blur(5px);
    z-index: 1000;
    font-size: 0.9rem;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    animation: pulse 2s infinite;
  }

  @keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
  }

  .article-container {
    padding: 80px 0;
  }

  article {
    background: rgba(30, 60, 114, 0.3);
    border-radius: 20px;
    padding: 40px;
    margin-bottom: 60px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    transition: var(--transition);
  }

  article:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
  }

  .section {
    margin-bottom: 60px;
    position: relative;
  }

  .section::before {
    content: '';
    position: absolute;
    top: -30px;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
  }

  .code-container {
    position: relative;
    margin: 30px 0;
    border-radius: 10px;
    overflow: hidden;
  }

  pre {
    background: rgba(16, 32, 39, 0.8);
    padding: 20px;
    border-radius: 10px;
    overflow-x: auto;
    font-size: 0.9rem;
    line-height: 1.5;
    position: relative;
  }

  pre::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(to bottom, var(--accent), #0072ff);
  }

  code {
    font-family: 'Courier New', monospace;
    color: #a3d8ff;
  }

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

  .image-card {
    position: relative;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
    transition: var(--transition);
    aspect-ratio: 1/1;
  }

  .image-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
  }

  .image-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
  }

  .image-card:hover img {
    transform: scale(1.05);
  }

  .image-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, transparent 60%, rgba(0, 0, 0, 0.7));
  }

  .nav-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 15px 0;
    background: rgba(30, 60, 114, 0.9);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  }

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

  .nav-links {
    display: flex;
    gap: 30px;
  }

  .nav-links a {
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
    position: relative;
    padding: 5px 0;
    transition: var(--transition);
  }

  .nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: var(--transition);
  }

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

  .nav-links a:hover {
    color: var(--accent);
  }

  .footer {
    background: rgba(16, 32, 39, 0.8);
    padding: 40px 0;
    text-align: center;
    margin-top: 80px;
  }

  @media (max-width: 768px) {
    .header {
      height: 60vh;
    }

    h1 {
      font-size: 2.2rem;
    }

    h2 {
      font-size: 1.8rem;
    }

    h3 {
      font-size: 1.5rem;
    }

    .header-content {
      padding: 20px;
    }

    .nav-links {
      gap: 15px;
    }

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

  @media (max-width: 480px) {
    .header {
      height: 50vh;
    }

    h1 {
      font-size: 1.8rem;
    }

    .nav-container {
      padding: 10px 0;
    }

    .nav-inner {
      flex-direction: column;
      gap: 10px;
    }

    .nav-links {
      flex-wrap: wrap;
      justify-content: center;
    }
  }