:root {
    --primary-bg: #0F1116;
    --secondary-bg: #1E243B;
    --accent-blue: #3EC8D5;
    --accent-purple: #8C4DE7;
    --text-primary: #FFFFFF;
    --text-secondary: #CCCCCC;
    --wave-opacity: 0.1;
    --card-radius: 16px;
    --transition-speed: 0.3s;
  }

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

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

  body {
    background: linear-gradient(135deg, var(--primary-bg) 0%, var(--secondary-bg) 100%);
    color: var(--text-primary);
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    min-height: 100%;
    overflow-x: hidden;
  }

  .container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
  }

  .header {
    position: relative;
    padding: 80px 0;
    text-align: center;
    background: url('https://images.gptkong.com/demo/sample1.png') center/cover no-repeat;
    border-radius: var(--card-radius);
    margin-bottom: 60px;
    overflow: hidden;
  }

  .header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 17, 22, 0.7);
    z-index: 1;
  }

  .header-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    margin: 0 auto;
    padding: 40px;
  }

  h1, h2, h3, h4 {
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.3;
  }

  h1 {
    font-size: 2.8rem;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 4px 20px rgba(62, 200, 213, 0.3);
  }

  h2 {
    font-size: 2rem;
    color: var(--accent-blue);
    position: relative;
    padding-bottom: 15px;
    margin-top: 60px;
  }

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

  h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-top: 40px;
  }

  p {
    font-size: 1.1rem;
    margin-bottom: 20px;
    color: var(--text-secondary);
  }

  .grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 30px;
    margin: 40px 0;
  }

  .card {
    background: rgba(30, 36, 59, 0.6);
    border-radius: var(--card-radius);
    padding: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    transition: all var(--transition-speed) ease;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.05);
  }

  .card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
    border-color: rgba(62, 200, 213, 0.3);
  }

  .code-container {
    position: relative;
    margin: 30px 0;
  }

  pre {
    background: rgba(15, 17, 22, 0.8);
    border-radius: 8px;
    padding: 20px;
    overflow: auto;
    font-family: 'Courier New', monospace;
    font-size: 0.95rem;
    line-height: 1.5;
    border-left: 4px solid var(--accent-blue);
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.05);
  }

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

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

  .gallery-item {
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
    transition: all var(--transition-speed) ease;
  }

  .gallery-item:hover {
    transform: scale(1.03);
    box-shadow: 0 12px 30px rgba(62, 200, 213, 0.3);
  }

  .gallery-item img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.5s ease;
  }

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

  .nav-tabs {
    display: flex;
    flex-wrap: wrap;
    margin: 40px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

  .nav-tab {
    padding: 12px 24px;
    cursor: pointer;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-weight: 700;
    position: relative;
    transition: all var(--transition-speed) ease;
  }

  .nav-tab:hover {
    color: var(--accent-blue);
  }

  .nav-tab.active {
    color: var(--accent-blue);
  }

  .nav-tab.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--accent-blue);
    border-radius: 3px 3px 0 0;
  }

  .wave-decoration {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100px;
    background: url('https://images.gptkong.com/demo/sample3.png') repeat-x;
    background-size: contain;
    opacity: 0.1;
    z-index: -1;
  }

  .footer-note {
    text-align: center;
    padding: 30px;
    margin-top: 80px;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.5);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
  }

  @media (max-width: 768px) {
    .container {
      padding: 0 20px;
    }
    
    .grid {
      grid-template-columns: 1fr;
    }
    
    h1 {
      font-size: 2rem;
    }
    
    h2 {
      font-size: 1.6rem;
    }
  }

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

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

  @keyframes pulse {
    0%, 100% {
      opacity: 1;
    }
    50% {
      opacity: 0.5;
    }
  }

  .pulsing {
    animation: pulse 3s ease-in-out infinite;
  }