:root {
    --primary: #1E90FF;
    --primary-light: #00BFFF;
    --accent: #FFA500;
    --accent-light: #FFD700;
    --success: #32CD32;
    --dark: #333333;
    --light: #f5f5f5;
    --gray: #e0e0e0;
    --white: #ffffff;
    --shadow: 0 4px 20px rgba(0,0,0,0.1);
    --transition: all 0.3s ease;
  }

  @import url('https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;700&display=swap');

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

  body {
    font-family: 'Roboto', sans-serif;
    color: var(--dark);
    background: var(--light);
    line-height: 1.6;
    overflow-x: hidden;
  }

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

  /* Header Styles */
  .header {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: var(--white);
    padding: 60px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
    margin-bottom: 60px;
  }

  .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;
  }

  .header h1 {
    font-size: 2.8rem;
    margin-bottom: 20px;
    text-shadow: 0 2px 4px rgba(0,0,0,0.2);
  }

  .header p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.9;
  }

  .notice {
    background: rgba(255,255,255,0.2);
    padding: 15px;
    border-radius: 8px;
    display: inline-block;
    margin-top: 30px;
    backdrop-filter: blur(5px);
    border: 1px solid rgba(255,255,255,0.3);
  }

  /* Navigation */
  .navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(30, 144, 255, 0.9);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: var(--transition);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  }

  .navbar.scrolled {
    background: rgba(25, 118, 210, 0.95);
  }

  .nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    max-width: 1200px;
    margin: 0 auto;
  }

  .nav-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--white);
    text-decoration: none;
  }

  .nav-menu {
    display: flex;
    list-style: none;
  }

  .nav-item {
    margin-left: 30px;
  }

  .nav-link {
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
    padding: 5px 0;
  }

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

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

  /* Article Styles */
  article {
    background: var(--white);
    border-radius: 12px;
    box-shadow: var(--shadow);
    padding: 40px;
    margin-bottom: 60px;
    position: relative;
    overflow: hidden;
  }

  article::before {
    content: "";
    position: absolute;
    top: 0;
    right: 0;
    width: 200px;
    height: 200px;
    background: url('https://images.gptkong.com/demo/sample2.png') center/cover no-repeat;
    opacity: 0.1;
    z-index: 0;
  }

  article h2 {
    color: var(--primary);
    font-size: 2rem;
    margin-bottom: 30px;
    position: relative;
    padding-bottom: 15px;
  }

  article h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: linear-gradient(to right, var(--primary), var(--accent));
    border-radius: 3px;
  }

  article h3 {
    color: var(--primary);
    font-size: 1.5rem;
    margin: 30px 0 20px;
  }

  article p {
    margin-bottom: 20px;
    font-size: 1.1rem;
    line-height: 1.7;
  }

  article strong {
    color: var(--primary);
  }

  /* Code Blocks */
  pre {
    background: #282c34;
    border-radius: 8px;
    padding: 20px;
    margin: 25px 0;
    overflow: auto;
    position: relative;
  }

  pre::before {
    content: '';
    position: absolute;
    top: 10px;
    left: 10px;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: #ff5f56;
    box-shadow: 20px 0 0 #ffbd2e, 40px 0 0 #27c93f;
  }

  code {
    font-family: 'Roboto Mono', monospace;
    color: #abb2bf;
    font-size: 0.9rem;
    line-height: 1.5;
  }

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

  .gallery-item {
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
  }

  .gallery-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
  }

  .gallery-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    display: block;
  }

  /* Footer */
  .footer {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: var(--white);
    padding: 40px 0;
    text-align: center;
  }

  .footer p {
    opacity: 0.8;
    margin-bottom: 20px;
  }

  /* Animations */
  @keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
  }

  @keyframes slideUp {
    from {
      opacity: 0;
      transform: translateY(30px);
    }
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  .animate {
    animation: fadeIn 1s ease-out forwards;
  }

  .animate-up {
    animation: slideUp 0.8s ease-out forwards;
  }

  /* Responsive Design */
  @media (max-width: 768px) {
    .header h1 {
      font-size: 2rem;
    }

    .nav-menu {
      display: none;
    }

    article {
      padding: 30px 20px;
    }

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

  @media (max-width: 480px) {
    .header {
      padding: 40px 0;
    }

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

    article h2 {
      font-size: 1.6rem;
    }

    article h3 {
      font-size: 1.3rem;
    }
  }