:root {
    --primary-dark: #0d0d2b;
    --primary-blue: #1a1a4a;
    --accent-teal: #00e6e6;
    --accent-green: #00ff00;
    --accent-purple: #800080;
    --text-light: #ffffff;
    --text-gray: #b3b3b3;
    --card-bg: rgba(26, 26, 74, 0.8);
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  }

  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Montserrat', sans-serif;
  }

  body {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-blue));
    color: var(--text-light);
    line-height: 1.6;
    padding-top: 80px;
  }

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

  .header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: linear-gradient(90deg, var(--primary-dark), var(--primary-blue));
    padding: 15px 0;
    z-index: 1000;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
  }

  .header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .logo {
    font-size: 24px;
    font-weight: 700;
    background: linear-gradient(to right, var(--accent-teal), var(--accent-green));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }

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

  .nav-link {
    color: var(--text-light);
    text-decoration: none;
    font-weight: 500;
    position: relative;
    transition: var(--transition);
  }

  .nav-link:hover {
    color: var(--accent-teal);
  }

  .nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-teal);
    transition: var(--transition);
  }

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

  .hero {
    padding: 100px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
  }

  .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: 0.1;
    z-index: -1;
  }

  .hero-title {
    font-size: 48px;
    margin-bottom: 20px;
    background: linear-gradient(to right, var(--accent-teal), var(--text-light));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-shadow: 0 2px 10px rgba(0, 230, 230, 0.3);
  }

  .hero-subtitle {
    font-size: 20px;
    color: var(--text-gray);
    max-width: 800px;
    margin: 0 auto 40px;
  }

  .notice {
    background: rgba(0, 230, 230, 0.1);
    border-left: 4px solid var(--accent-teal);
    padding: 15px;
    margin: 30px 0;
    border-radius: 0 8px 8px 0;
  }

  .content-section {
    padding: 60px 0;
  }

  .section-title {
    font-size: 32px;
    margin-bottom: 40px;
    position: relative;
    display: inline-block;
  }

  .section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 50px;
    height: 3px;
    background: var(--accent-teal);
  }

  .article-content {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 40px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    margin-bottom: 60px;
  }

  .article-content h2 {
    font-size: 28px;
    margin: 30px 0 20px;
    color: var(--accent-teal);
  }

  .article-content h3 {
    font-size: 22px;
    margin: 25px 0 15px;
    color: var(--text-light);
  }

  .article-content p {
    margin-bottom: 20px;
    font-size: 16px;
    line-height: 1.8;
  }

  pre {
    background: rgba(0, 0, 0, 0.3);
    border-radius: 8px;
    padding: 20px;
    margin: 25px 0;
    overflow-x: auto;
    border-left: 4px solid var(--accent-teal);
  }

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

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

  .grid-image {
    width: 100%;
    height: 300px;
    object-fit: cover;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    transition: var(--transition);
  }

  .grid-image:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 230, 230, 0.3);
  }

  .data-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin: 40px 0;
  }

  .data-card {
    background: var(--card-bg);
    border-radius: 10px;
    padding: 20px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: var(--transition);
    border-top: 3px solid var(--accent-teal);
  }

  .data-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 25px rgba(0, 230, 230, 0.3);
  }

  .data-card h4 {
    color: var(--accent-teal);
    margin-bottom: 10px;
  }

  .data-card .value {
    font-size: 24px;
    font-weight: 700;
  }

  .positive {
    color: var(--accent-green);
  }

  .negative {
    color: #ff4d4d;
  }

  .footer {
    background: var(--primary-blue);
    padding: 40px 0;
    text-align: center;
    margin-top: 60px;
  }

  .footer-text {
    color: var(--text-gray);
    font-size: 14px;
  }

  @media (max-width: 768px) {
    .hero-title {
      font-size: 36px;
    }
    
    .hero-subtitle {
      font-size: 18px;
    }
    
    .nav-links {
      gap: 15px;
    }
    
    .article-content {
      padding: 30px;
    }
  }

  @media (max-width: 480px) {
    .hero-title {
      font-size: 28px;
    }
    
    .nav-links {
      display: none;
    }
    
    .article-content {
      padding: 20px;
    }
    
    .section-title {
      font-size: 26px;
    }
  }

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

  .floating {
    animation: float 3s ease-in-out infinite;
  }

  @keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
  }

  .pulsing {
    animation: pulse 2s ease-in-out infinite;
  }