@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;700&display=swap');
  
  :root {
    --primary: #1E90FF;
    --primary-light: #00BFFF;
    --dark: #2F4F4F;
    --light: #D3D3D3;
    --accent: #9370DB;
    --success: #32CD32;
    --warning: #FFA500;
    --danger: #FF4500;
  }
  
  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  body {
    font-family: 'Roboto', sans-serif;
    background-color: var(--dark);
    color: var(--light);
    line-height: 1.6;
    overflow-x: hidden;
  }
  
  .container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
  }
  
  .header {
    text-align: center;
    padding: 40px 0;
    position: relative;
    overflow: hidden;
    border-radius: 0 0 20px 20px;
    background: linear-gradient(135deg, rgba(30, 144, 255, 0.2), rgba(47, 79, 79, 0.8));
    margin-bottom: 40px;
    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') center/cover no-repeat;
    opacity: 0.1;
    z-index: -1;
  }
  
  .header h1 {
    font-size: 2.8rem;
    margin-bottom: 20px;
    color: var(--light);
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
    background: linear-gradient(to right, var(--primary), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
  }
  
  .reference-note {
    background-color: rgba(255, 255, 255, 0.1);
    padding: 15px;
    border-radius: 8px;
    margin: 20px auto;
    max-width: 800px;
    border-left: 4px solid var(--primary);
    font-size: 0.9rem;
    text-align: center;
  }
  
  .nav-tabs {
    display: flex;
    justify-content: center;
    background-color: rgba(47, 79, 79, 0.8);
    padding: 15px;
    border-radius: 10px;
    margin-bottom: 30px;
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
  }
  
  .nav-tab {
    margin: 0 15px;
    padding: 10px 20px;
    color: var(--light);
    cursor: pointer;
    position: relative;
    transition: all 0.3s ease;
    font-weight: 500;
    border-radius: 5px;
  }
  
  .nav-tab:hover {
    color: var(--primary);
    transform: translateY(-3px);
  }
  
  .nav-tab.active {
    color: var(--primary);
  }
  
  .nav-tab.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 50%;
    transform: translateX(-50%);
    width: 60%;
    height: 3px;
    background: var(--primary);
    border-radius: 3px;
  }
  
  .main-content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
  }
  
  .section {
    background-color: rgba(47, 79, 79, 0.6);
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    overflow: hidden;
  }
  
  .section:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
  }
  
  .section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(90deg, var(--primary), var(--primary-light));
  }
  
  .section h2 {
    font-size: 1.8rem;
    margin-bottom: 20px;
    color: var(--primary);
    position: relative;
    display: inline-block;
  }
  
  .section h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 50px;
    height: 3px;
    background: var(--primary);
    border-radius: 3px;
  }
  
  .section h3 {
    font-size: 1.4rem;
    margin: 25px 0 15px;
    color: var(--light);
  }
  
  .section p {
    margin-bottom: 15px;
    font-size: 1.1rem;
  }
  
  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin: 30px 0;
  }
  
  .image-card {
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    position: relative;
    height: 300px;
  }
  
  .image-card:hover {
    transform: scale(1.03);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
  }
  
  .image-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
  }
  
  .image-card:hover img {
    transform: scale(1.1);
  }
  
  .code-block {
    background-color: rgba(0, 0, 0, 0.3);
    border-radius: 10px;
    padding: 20px;
    margin: 20px 0;
    overflow-x: auto;
    border-left: 4px solid var(--primary);
    font-family: 'Courier New', monospace;
    font-size: 0.95rem;
    line-height: 1.5;
  }
  
  .code-block pre {
    margin: 0;
    white-space: pre-wrap;
  }
  
  .code-block code {
    color: #f8f8f2;
    display: block;
  }
  
  table {
    width: 100%;
    border-collapse: collapse;
    margin: 25px 0;
    background-color: rgba(47, 79, 79, 0.5);
    border-radius: 10px;
    overflow: hidden;
  }
  
  th, td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }
  
  th {
    background-color: var(--primary);
    color: white;
    font-weight: 500;
  }
  
  tr:hover {
    background-color: rgba(30, 144, 255, 0.1);
  }
  
  .footer {
    text-align: center;
    padding: 30px;
    margin-top: 50px;
    background-color: rgba(47, 79, 79, 0.8);
    border-radius: 15px 15px 0 0;
    position: relative;
  }
  
  .footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--primary-light));
  }
  
  .wave-bg {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100px;
    background: url('https://images.gptkong.com/demo/sample6.png') repeat-x;
    background-size: 1000px 100px;
    animation: wave 15s linear infinite;
    opacity: 0.3;
  }
  
  @keyframes wave {
    0% { background-position-x: 0; }
    100% { background-position-x: 1000px; }
  }
  
  .tech-element {
    position: absolute;
    width: 150px;
    height: 150px;
    background: url('https://images.gptkong.com/demo/sample3.png') center/contain no-repeat;
    opacity: 0.1;
    z-index: -1;
  }
  
  .tech-element-1 {
    top: 10%;
    left: 5%;
    animation: float 6s ease-in-out infinite;
  }
  
  .tech-element-2 {
    bottom: 15%;
    right: 5%;
    animation: float 8s ease-in-out infinite 2s;
  }
  
  @keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
  }
  
  @media (max-width: 768px) {
    .header h1 {
      font-size: 2rem;
    }
    
    .nav-tabs {
      flex-wrap: wrap;
    }
    
    .nav-tab {
      margin: 5px;
      padding: 8px 15px;
    }
    
    .section {
      padding: 20px;
    }
    
    .image-grid {
      grid-template-columns: 1fr;
    }
  }