:root {
    --primary: #1b2735;
    --secondary: #4a3aff;
    --accent: #00f7ff;
    --text: #e0e0e0;
    --glass: rgba(255, 255, 255, 0.1);
    --dark-glass: rgba(0, 0, 0, 0.3);
    --font-main: 'Montserrat', system-ui, sans-serif;
  }

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

  body {
    font-family: var(--font-main);
    line-height: 1.8;
    color: var(--text);
    background: radial-gradient(ellipse at bottom, var(--primary) 0%, #090a0f 100%);
    min-height: 100%;
    overflow-x: hidden;
  }

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

  /* Header & Navigation */
  .header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 20px 0;
    background: var(--dark-glass);
    backdrop-filter: blur(10px);
    z-index: 1000;
    box-shadow: 0 5px 30px rgba(0, 0, 0, 0.3);
  }

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

  .logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
  }

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

  .nav-link {
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
    position: relative;
    transition: all 0.3s ease;
  }

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

  .nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width 0.3s ease;
  }

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

  /* Hero Section */
  .hero {
    padding: 180px 0 100px;
    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: 3.5rem;
    margin-bottom: 20px;
    background: linear-gradient(90deg, var(--accent), var(--secondary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    animation: gradientShift 8s ease infinite;
    background-size: 200% 200%;
  }

  @keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
  }

  .hero-subtitle {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto 40px;
    opacity: 0.9;
  }

  .notice {
    background: var(--glass);
    backdrop-filter: blur(10px);
    padding: 15px;
    border-radius: 10px;
    max-width: 800px;
    margin: 0 auto 60px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  }

  /* Main Content */
  .main-content {
    padding: 60px 0;
  }

  article {
    background: var(--glass);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
    border: 1px solid rgba(255, 255, 255, 0.1);
  }

  article h2 {
    font-size: 2rem;
    margin: 30px 0 20px;
    color: var(--accent);
    position: relative;
    padding-bottom: 10px;
  }

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

  article h3 {
    font-size: 1.5rem;
    margin: 25px 0 15px;
    color: #fff;
  }

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

  article img {
    max-width: 100%;
    height: auto;
    border-radius: 15px;
    margin: 30px auto;
    display: block;
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.4);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }

  article img:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
  }

  /* Code Blocks */
  pre {
    background: rgba(0, 0, 0, 0.3);
    border-radius: 10px;
    padding: 20px;
    margin: 25px 0;
    overflow-x: auto;
    border-left: 3px solid var(--accent);
    box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.5);
  }

  code {
    font-family: 'Fira Code', monospace;
    font-size: 0.9rem;
    color: var(--accent);
  }

  /* Grid Layout */
  .grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin: 40px 0;
  }

  .card {
    background: var(--glass);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 25px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
  }

  .card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.4);
  }

  .card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 10px;
    margin-bottom: 15px;
  }

  /* Footer */
  .footer {
    text-align: center;
    padding: 40px 0;
    margin-top: 60px;
    background: var(--dark-glass);
    backdrop-filter: blur(10px);
  }

  /* Animations */
  @keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
  }

  .floating {
    animation: float 6s ease-in-out infinite;
  }

  /* Responsive */
  @media (max-width: 768px) {
    .hero-title {
      font-size: 2.5rem;
    }
    
    .nav-links {
      gap: 15px;
    }
    
    article {
      padding: 30px 20px;
    }
  }

  @media (max-width: 480px) {
    .hero-title {
      font-size: 2rem;
    }
    
    .nav-container {
      flex-direction: column;
      gap: 20px;
    }
    
    .grid {
      grid-template-columns: 1fr;
    }
  }