:root {
    --primary-dark: #001f3f;
    --secondary-dark: #0A0A0A;
    --accent-green: #00FF00;
    --accent-orange: #FFA500;
    --neutral-light: #f8f9fa;
    --neutral-mid: #e9ecef;
    --text-primary: #ffffff;
    --text-secondary: #adb5bd;
  }

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

  @font-face {
    font-family: 'Open Sans';
    src: url('https://fonts.googleapis.com/css2?family=Open+Sans:wght@400;600&display=swap');
  }

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

  body {
    font-family: 'Open Sans', sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--primary-dark), var(--secondary-dark));
    min-height: 100%;
    overflow-x: hidden;
  }

  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
  }

  .hero {
    position: relative;
    height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at 30% 50%, rgba(0, 31, 63, 0.8), rgba(10, 10, 10, 0.9));
    border-radius: 16px;
    margin-bottom: 3rem;
    overflow: hidden;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
  }

  .hero::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: 0.15;
    z-index: -1;
  }

  .hero-content {
    text-align: center;
    padding: 2rem;
    z-index: 1;
  }

  .hero h1 {
    font-family: 'Roboto', sans-serif;
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    background: linear-gradient(90deg, var(--accent-green), var(--accent-orange));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-shadow: 0 2px 10px rgba(0, 255, 0, 0.3);
  }

  .hero p {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto 2rem;
    color: var(--text-secondary);
  }

  .notice {
    background: rgba(0, 255, 0, 0.1);
    border-left: 4px solid var(--accent-green);
    padding: 1rem;
    margin: 2rem 0;
    border-radius: 0 8px 8px 0;
    font-size: 0.9rem;
  }

  article {
    background: rgba(10, 10, 10, 0.7);
    border-radius: 16px;
    padding: 2.5rem;
    margin-bottom: 3rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.05);
  }

  article h2 {
    font-family: 'Roboto', sans-serif;
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--accent-orange);
    position: relative;
    padding-bottom: 0.5rem;
  }

  article h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-orange), transparent);
    border-radius: 3px;
  }

  article h3 {
    font-family: 'Roboto', sans-serif;
    font-size: 1.5rem;
    margin: 2rem 0 1rem;
    color: var(--accent-green);
  }

  article p {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
  }

  pre {
    background: rgba(0, 31, 63, 0.5);
    border-radius: 8px;
    padding: 1.5rem;
    margin: 1.5rem 0;
    overflow: auto;
    border-left: 4px solid var(--accent-green);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
    color: var(--accent-green);
    box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.5);
  }

  code {
    font-family: 'Courier New', monospace;
    background: rgba(0, 255, 0, 0.1);
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    color: var(--accent-green);
    font-size: 0.9rem;
  }

  .gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
  }

  .gallery-item {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }

  .gallery-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 255, 0, 0.3);
  }

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

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

  .gallery-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 1rem;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
    color: white;
    font-size: 0.9rem;
    opacity: 0;
    transition: opacity 0.3s ease;
  }

  .gallery-item:hover .gallery-caption {
    opacity: 1;
  }

  .nav-tabs {
    display: flex;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: 2rem;
  }

  .nav-tab {
    padding: 0.75rem 1.5rem;
    cursor: pointer;
    position: relative;
    color: var(--text-secondary);
    transition: color 0.3s ease;
  }

  .nav-tab:hover {
    color: var(--text-primary);
  }

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

  .nav-tab.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--accent-green);
  }

  .tab-content {
    display: none;
  }

  .tab-content.active {
    display: block;
    animation: fadeIn 0.5s ease;
  }

  @keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
  }

  .floating-button {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-green), var(--accent-orange));
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 5px 15px rgba(0, 255, 0, 0.3);
    cursor: pointer;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    z-index: 100;
  }

  .floating-button:hover {
    transform: scale(1.1) rotate(15deg);
    box-shadow: 0 8px 25px rgba(0, 255, 0, 0.5);
  }

  .floating-button i {
    color: var(--primary-dark);
    font-size: 1.5rem;
  }

  @media (max-width: 768px) {
    .container {
      padding: 1rem;
    }

    .hero {
      height: 400px;
    }

    .hero h1 {
      font-size: 2rem;
    }

    .hero p {
      font-size: 1rem;
    }

    article {
      padding: 1.5rem;
    }

    article h2 {
      font-size: 1.5rem;
    }

    article h3 {
      font-size: 1.2rem;
    }

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

  @media (max-width: 480px) {
    .hero {
      height: 300px;
    }

    .hero h1 {
      font-size: 1.8rem;
    }

    article {
      padding: 1rem;
    }
  }