:root {
    --primary-gradient: linear-gradient(135deg, #4b6cb7, #182848);
    --secondary-gradient: linear-gradient(45deg, #ff6b6b, #f06595);
    --accent-color: #f06595;
    --dark-blue: #182848;
    --light-gray: #f5f5f5;
    --text-color: #333;
    --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  }

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

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

  body {
    font-family: 'Roboto', sans-serif;
    color: var(--text-color);
    background: var(--light-gray);
    line-height: 1.6;
    overflow-x: hidden;
  }

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

  .header {
    background: var(--primary-gradient);
    color: white;
    padding: 2rem 0;
    position: relative;
    overflow: hidden;
    margin-bottom: 3rem;
  }

  .header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('https://images.gptkong.com/demo/sample1.png') no-repeat;
    background-size: cover;
    opacity: 0.1;
    z-index: 0;
  }

  .header-content {
    position: relative;
    z-index: 1;
    text-align: center;
  }

  .header h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
  }

  .header p {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto 2rem;
  }

  .notice {
    background: rgba(255, 255, 255, 0.2);
    padding: 1rem;
    border-radius: 8px;
    display: inline-block;
    margin-top: 2rem;
    backdrop-filter: blur(5px);
  }

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

  .nav a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 25px;
    transition: var(--transition);
    position: relative;
  }

  .nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: var(--transition);
    transform: translateX(-50%);
  }

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

  article {
    background: white;
    border-radius: 12px;
    box-shadow: var(--card-shadow);
    padding: 3rem;
    margin-bottom: 3rem;
    position: relative;
    overflow: hidden;
  }

  article::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 200px;
    height: 200px;
    background: url('https://images.gptkong.com/demo/sample2.png') no-repeat;
    background-size: contain;
    opacity: 0.1;
    z-index: 0;
  }

  article h2 {
    color: var(--dark-blue);
    font-size: 2rem;
    margin-bottom: 1.5rem;
    position: relative;
    z-index: 1;
  }

  article h3 {
    color: var(--dark-blue);
    font-size: 1.5rem;
    margin: 2rem 0 1rem;
    position: relative;
    z-index: 1;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--accent-color);
  }

  article p {
    margin-bottom: 1.5rem;
    position: relative;
    z-index: 1;
  }

  article color {
    color: var(--accent-color);
    font-weight: 500;
  }

  pre {
    background: #282c34;
    border-radius: 8px;
    padding: 1.5rem;
    margin: 1.5rem 0;
    overflow: auto;
    position: relative;
    z-index: 1;
  }

  code {
    font-family: 'Roboto Mono', monospace;
    color: #abb2bf;
    font-size: 0.9rem;
  }

  .code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(0, 0, 0, 0.2);
    padding: 0.5rem 1rem;
    border-radius: 8px 8px 0 0;
    color: white;
    font-size: 0.8rem;
  }

  table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
    position: relative;
    z-index: 1;
  }

  th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid #eee;
  }

  th {
    background: var(--dark-blue);
    color: white;
  }

  tr:nth-child(even) {
    background: #f9f9f9;
  }

  .gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
  }

  .gallery-item {
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
    position: relative;
  }

  .gallery-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
  }

  .gallery-item img {
    width: 100%;
    height: auto;
    display: block;
    transition: var(--transition);
  }

  .gallery-item:hover img {
    transform: scale(1.05);
  }

  .footer {
    background: var(--dark-blue);
    color: white;
    padding: 3rem 0;
    text-align: center;
    margin-top: 3rem;
  }

  .footer p {
    margin-bottom: 1rem;
  }

  .footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 1.5rem;
    flex-wrap: wrap;
  }

  .footer-links a {
    color: white;
    text-decoration: none;
    transition: var(--transition);
  }

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

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

    article {
      padding: 2rem;
    }

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

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

  .gradient-animation {
    background: var(--primary-gradient);
    background-size: 400% 400%;
    animation: gradientAnimation 15s ease infinite;
  }