:root {
    --primary: #1e3c72;
    --secondary: #2a5298;
    --accent: #9c27b0;
    --highlight: #e91e63;
    --gold: #ff9800;
    --text: #f8f9fa;
    --bg-dark: #0a192f;
    --bg-light: rgba(255,255,255,0.1);
  }

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

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

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

  /* Header Styles */
  header {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    padding: 30px 0;
    position: relative;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
  }

  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;
    padding: 40px 0;
  }

  .header-content h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    background: linear-gradient(to right, #fff, var(--gold));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 2px 10px rgba(0,0,0,0.2);
  }

  .header-content p {
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto 30px;
  }

  .notice {
    background: rgba(255,255,255,0.2);
    padding: 15px;
    border-radius: 8px;
    max-width: 600px;
    margin: 0 auto;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.1);
  }

  /* Navigation */
  nav {
    background: rgba(30, 60, 114, 0.9);
    padding: 15px 30px;
    position: sticky;
    top: 0;
    z-index: 1000;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
  }

  nav.scrolled {
    background: rgba(30, 60, 114, 1);
    box-shadow: 0 5px 20px rgba(0,0,0,0.2);
  }

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

  .nav-links a {
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
    position: relative;
    padding: 5px 0;
    transition: all 0.3s ease;
  }

  .nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gold);
    transition: width 0.3s ease;
  }

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

  /* Main Content */
  main {
    padding: 60px 0;
  }

  article {
    background: rgba(10, 25, 47, 0.8);
    border-radius: 15px;
    padding: 40px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    margin-bottom: 60px;
    position: relative;
    overflow: hidden;
  }

  article::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(233,30,99,0.1) 0%, transparent 70%);
    z-index: -1;
    animation: rotate 60s linear infinite;
  }

  @keyframes rotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
  }

  article h2 {
    font-size: 2.5rem;
    margin-bottom: 30px;
    color: var(--gold);
    position: relative;
    padding-bottom: 15px;
  }

  article h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100px;
    height: 3px;
    background: linear-gradient(to right, var(--gold), var(--highlight));
    border-radius: 3px;
  }

  article h3 {
    font-size: 1.8rem;
    margin: 40px 0 20px;
    color: var(--text);
    position: relative;
    padding-left: 20px;
  }

  article h3::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 8px;
    height: 8px;
    background: var(--highlight);
    border-radius: 50%;
  }

  article p {
    margin-bottom: 25px;
    font-size: 1.1rem;
    line-height: 1.8;
  }

  /* Code Blocks */
  pre {
    background: rgba(0,0,0,0.3);
    border-radius: 10px;
    padding: 20px;
    margin: 30px 0;
    overflow: hidden;
    position: relative;
    border-left: 4px solid var(--highlight);
  }

  pre::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 30px;
    background: rgba(0,0,0,0.2);
  }

  code {
    font-family: 'Courier New', monospace;
    color: #f8f8f2;
    display: block;
    white-space: pre-wrap;
  }

  /* Image Gallery */
  .image-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin: 40px 0;
  }

  .gallery-item {
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
    transition: all 0.3s ease;
    position: relative;
  }

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

  .gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
  }

  .gallery-item:hover img {
    transform: scale(1.1);
  }

  /* Table Styles */
  table {
    width: 100%;
    border-collapse: collapse;
    margin: 30px 0;
    background: rgba(255,255,255,0.05);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
  }

  th, td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid rgba(255,255,255,0.1);
  }

  th {
    background: linear-gradient(to right, var(--primary), var(--secondary));
    color: white;
    font-weight: 500;
  }

  tbody tr:hover {
    background: rgba(255,255,255,0.1);
  }

  .positive {
    color: #4caf50;
    font-weight: bold;
  }

  .negative {
    color: #f44336;
    font-weight: bold;
  }

  /* Footer */
  footer {
    background: linear-gradient(to right, var(--primary), var(--secondary));
    padding: 40px 0;
    text-align: center;
    position: relative;
  }

  footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('https://images.gptkong.com/demo/sample12.png') no-repeat;
    background-size: cover;
    opacity: 0.1;
    z-index: 0;
  }

  .footer-content {
    position: relative;
    z-index: 1;
  }

  /* Responsive Design */
  @media (max-width: 768px) {
    .header-content h1 {
      font-size: 2.2rem;
    }
    
    .nav-links {
      gap: 15px;
    }
    
    article {
      padding: 30px 20px;
    }
    
    article h2 {
      font-size: 2rem;
    }
    
    article h3 {
      font-size: 1.5rem;
    }
  }

  @media (max-width: 480px) {
    .header-content h1 {
      font-size: 1.8rem;
    }
    
    .nav-links {
      display: none;
    }
    
    article {
      padding: 25px 15px;
    }
    
    pre {
      padding: 15px;
      font-size: 0.9rem;
    }
  }

  /* Animations */
  @keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
  }

  .floating {
    animation: float 6s ease-in-out infinite;
  }

  /* Decorative Elements */
  .decorative-circle {
    position: absolute;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(233,30,99,0.1) 0%, transparent 70%);
    z-index: -1;
  }

  .circle-1 {
    top: 10%;
    right: 10%;
    animation: float 8s ease-in-out infinite;
  }

  .circle-2 {
    bottom: 15%;
    left: 5%;
    animation: float 10s ease-in-out infinite 2s;
  }

  /* Scroll Indicator */
  .scroll-indicator {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: rgba(255,255,255,0.2);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: all 0.3s ease;
    backdrop-filter: blur(5px);
    z-index: 999;
  }

  .scroll-indicator:hover {
    background: rgba(255,255,255,0.3);
    transform: scale(1.1);
  }

  .scroll-indicator::after {
    content: '↑';
    color: white;
    font-size: 20px;
    font-weight: bold;
  }