:root {
    --primary-dark-blue: #0B132B;
    --primary-purple: #6C5DD7;
    --accent-electric-blue: #3F94F3;
    --accent-fluorescent-green: #8BE9FD;
    --neutral-black: #000000;
    --neutral-white: #FFFFFF;
    --gray-100: #F8F9FA;
    --gray-800: #343A40;
  }

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

  body {
    font-family: 'Montserrat', 'Arial', sans-serif;
    background: linear-gradient(135deg, var(--primary-dark-blue), var(--gray-800));
    color: var(--neutral-white);
    line-height: 1.6;
    min-height: 100%;
    overflow-x: hidden;
  }

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

  .header {
    background: linear-gradient(90deg, var(--primary-purple), var(--accent-electric-blue));
    padding: 40px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
    margin-bottom: 60px;
    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: 0;
  }

  .header-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
  }

  .notice {
    background-color: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 15px;
    border-radius: 8px;
    margin: 30px auto;
    max-width: 800px;
    text-align: center;
    border: 1px solid rgba(255, 255, 255, 0.2);
  }

  article {
    background-color: rgba(11, 19, 43, 0.8);
    border-radius: 15px;
    padding: 40px;
    margin-bottom: 60px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(5px);
    border: 1px solid rgba(108, 93, 215, 0.3);
  }

  h2 {
    color: var(--accent-fluorescent-green);
    font-size: 28px;
    margin: 40px 0 20px;
    position: relative;
    padding-bottom: 10px;
  }

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

  p {
    margin-bottom: 20px;
    font-size: 17px;
    color: rgba(255, 255, 255, 0.9);
  }

  pre {
    background: rgba(0, 0, 0, 0.3);
    border-radius: 10px;
    padding: 20px;
    margin: 25px 0;
    overflow: auto;
    border-left: 4px solid var(--accent-electric-blue);
    font-family: 'Courier New', monospace;
    font-size: 15px;
    line-height: 1.5;
    color: var(--accent-fluorescent-green);
    box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.5);
  }

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

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

  .card {
    background: linear-gradient(145deg, rgba(108, 93, 215, 0.2), rgba(63, 148, 243, 0.1));
    border-radius: 15px;
    padding: 30px;
    transition: all 0.4s ease;
    border: 1px solid rgba(108, 93, 215, 0.3);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    position: relative;
    overflow: hidden;
  }

  .card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(
      to bottom right,
      transparent,
      transparent,
      transparent,
      rgba(139, 233, 253, 0.1),
      transparent
    );
    transform: rotate(30deg);
    animation: shine 3s infinite;
  }

  @keyframes shine {
    0% { transform: rotate(30deg) translate(-10%, -10%); }
    100% { transform: rotate(30deg) translate(10%, 10%); }
  }

  .card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
    border-color: rgba(63, 148, 243, 0.5);
  }

  .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: scale(1.03);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
  }

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

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

  .gallery-item::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
      to top,
      rgba(11, 19, 43, 0.7),
      transparent
    );
    opacity: 0;
    transition: opacity 0.3s ease;
  }

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

  .navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(11, 19, 43, 0.9);
    backdrop-filter: blur(10px);
    display: flex;
    justify-content: center;
    padding: 15px 0;
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
    z-index: 1000;
    animation: slideDown 0.5s ease-out;
  }

  @keyframes slideDown {
    from { top: -80px; }
    to { top: 0; }
  }

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

  .nav-links a {
    color: var(--neutral-white);
    text-decoration: none;
    font-weight: 500;
    padding: 10px 15px;
    border-radius: 8px;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
  }

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

  .nav-links a:hover {
    color: var(--accent-fluorescent-green);
  }

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

  .footer {
    background: linear-gradient(90deg, var(--primary-purple), var(--accent-electric-blue));
    padding: 30px 0;
    text-align: center;
    margin-top: 60px;
  }

  @media (max-width: 768px) {
    .grid-container {
      grid-template-columns: 1fr;
    }
    
    .nav-links {
      gap: 15px;
    }
    
    article {
      padding: 30px 20px;
    }
  }

  @media (max-width: 480px) {
    .header {
      padding: 30px 0;
    }
    
    .nav-links {
      gap: 10px;
      font-size: 14px;
    }
  }