:root {
    --primary: linear-gradient(135deg, #4A90E2, #9013FE);
    --secondary: #FFA500;
    --accent: #4BB543;
    --text: #333;
    --light: #f9f9f9;
    --dark: #1a1a1a;
    --shadow: 0 4px 20px rgba(0,0,0,0.1);
    --radius: 12px;
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  }

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

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

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

  /* Header Styles */
  .header {
    background: var(--primary);
    color: white;
    padding: 2rem 0;
    text-align: center;
    position: relative;
    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;
    opacity: 0.1;
    z-index: 0;
  }

  .header-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
  }

  .header h1 {
    font-size: 2.8rem;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
  }

  .header p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
  }

  .notice {
    background: rgba(255,255,255,0.2);
    padding: 10px;
    border-radius: var(--radius);
    margin-top: 2rem;
    display: inline-block;
    backdrop-filter: blur(5px);
  }

  /* Navigation */
  .nav {
    display: flex;
    justify-content: center;
    background: rgba(0,0,0,0.1);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
  }

  .nav a {
    color: white;
    text-decoration: none;
    margin: 0 1.5rem;
    font-weight: 600;
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    transition: var(--transition);
  }

  .nav a:hover {
    background: rgba(255,255,255,0.2);
  }

  /* Article Styles */
  article {
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 3rem;
    margin: 3rem auto;
    max-width: 900px;
  }

  article h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: #4A90E2;
    position: relative;
    padding-bottom: 0.5rem;
  }

  article h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: var(--secondary);
  }

  article h3 {
    font-size: 1.5rem;
    margin: 2rem 0 1rem;
    color: #9013FE;
  }

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

  article strong {
    color: #4A90E2;
  }

  /* Code Blocks */
  pre {
    background: var(--dark);
    color: #f8f8f2;
    padding: 1.5rem;
    border-radius: var(--radius);
    margin: 2rem 0;
    overflow: auto;
    position: relative;
  }

  pre::before {
    content: 'CSS';
    position: absolute;
    top: 0;
    left: 0;
    background: var(--secondary);
    color: white;
    padding: 0.2rem 0.8rem;
    border-radius: 0 0 var(--radius) 0;
    font-size: 0.8rem;
    font-weight: bold;
  }

  code {
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
  }

  /* Images */
  .img-container {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin: 2rem 0;
    justify-content: center;
  }

  .img-box {
    width: 300px;
    height: 300px;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
  }

  .img-box:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
  }

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

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

  /* Table Styles */
  table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
    box-shadow: var(--shadow);
    border-radius: var(--radius);
    overflow: hidden;
  }

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

  th {
    background: var(--primary);
    color: white;
    font-weight: 600;
  }

  tr:nth-child(even) {
    background: #f5f5f5;
  }

  tr:hover {
    background: #f0f0f0;
  }

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

  .floating {
    animation: float 3s ease-in-out infinite;
  }

  /* Responsive */
  @media (max-width: 768px) {
    .header h1 {
      font-size: 2rem;
    }
    
    article {
      padding: 2rem;
    }
    
    .img-box {
      width: 100%;
    }
  }

  @media (max-width: 480px) {
    .nav {
      flex-wrap: wrap;
    }
    
    .nav a {
      margin: 0.5rem;
    }
    
    article {
      padding: 1.5rem;
    }
  }