:root {
    --primary-dark: #032B44;
    --primary-light: #C5D1DC;
    --accent-green: #8BC34A;
    --accent-orange: #FF9800;
    --text-light: #FFFFFF;
    --text-muted: rgba(255,255,255,0.7);
    --transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
  }

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

  body {
    background: radial-gradient(circle at 20% 30%, var(--primary-dark), 
                linear-gradient(135deg, var(--primary-dark), var(--primary-light));
    color: var(--text-light);
    font-family: 'Montserrat', sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
  }

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

  header {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2rem;
    overflow: hidden;
  }

  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: 0.15;
    z-index: -1;
  }

  .hero-content {
    max-width: 800px;
    position: relative;
    z-index: 1;
  }

  h1 {
    font-family: 'Roboto', sans-serif;
    font-size: clamp(2.5rem, 5vw, 4rem);
    margin-bottom: 1.5rem;
    text-shadow: 0 4px 12px rgba(0,0,0,0.3);
    background: linear-gradient(90deg, var(--text-light), var(--primary-light));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }

  .subtitle {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
  }

  .notice {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: rgba(0,0,0,0.7);
    padding: 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    z-index: 1000;
  }

  article {
    background: rgba(3, 43, 68, 0.8);
    backdrop-filter: blur(10px);
    border-radius: 24px;
    padding: 3rem;
    margin: 3rem auto;
    box-shadow: 0 16px 32px rgba(0,0,0,0.2);
    max-width: 1000px;
  }

  h2, h3 {
    font-family: 'Roboto', sans-serif;
    margin: 2rem 0 1.5rem;
    position: relative;
  }

  h2 {
    font-size: 2rem;
    color: var(--accent-green);
  }

  h3 {
    font-size: 1.5rem;
    color: var(--accent-orange);
  }

  p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
  }

  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
  }

  .decorative-img {
    width: 100%;
    height: 300px;
    object-fit: cover;
    border-radius: 16px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.2);
    transition: var(--transition);
  }

  .decorative-img:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 12px 32px rgba(0,0,0,0.3);
  }

  pre {
    background: rgba(0,0,0,0.3);
    border-left: 4px solid var(--accent-green);
    border-radius: 8px;
    padding: 1.5rem;
    margin: 2rem 0;
    overflow: auto;
    font-family: 'Courier New', monospace;
    font-size: 0.95rem;
    line-height: 1.5;
  }

  code {
    color: var(--accent-orange);
    font-family: inherit;
  }

  .card {
    background: rgba(197, 209, 220, 0.1);
    border-radius: 16px;
    padding: 2rem;
    margin: 2rem 0;
    box-shadow: 0 8px 32px rgba(0,0,0,0.2);
    transition: var(--transition);
    border: 1px solid rgba(255,255,255,0.1);
  }

  .card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.3);
  }

  .toggle-switch {
    width: 60px;
    height: 30px;
    background: linear-gradient(145deg, #C5D1DC, #FFFFFF);
    border-radius: 15px;
    box-shadow: inset 5px 5px 10px #A3B8C2, inset -5px -5px 10px #FFFFFF;
    position: relative;
    transition: background 0.3s ease;
    margin: 1rem 0;
  }

  .toggle-switch::after {
    content: '';
    width: 26px;
    height: 26px;
    background: #8BC34A;
    border-radius: 50%;
    position: absolute;
    top: 2px;
    left: 2px;
    box-shadow: 2px 2px 5px rgba(0,0,0,0.2);
    transition: transform 0.3s ease;
  }

  .toggle-switch.active {
    background: linear-gradient(145deg, #FF9800, #FFFFFF);
  }

  .toggle-switch.active::after {
    transform: translateX(30px);
    background: #C5D1DC;
  }

  @media (max-width: 768px) {
    article {
      padding: 2rem 1.5rem;
    }
    
    .image-grid {
      grid-template-columns: 1fr;
    }
  }