:root {
    --primary-dark: #000428;
    --primary-light: #004e92;
    --accent-electric: #00FFFF;
    --accent-neon: #00FF00;
    --neutral-dark: #1A1A2E;
    --neutral-light: #E6E6E6;
    --text-primary: #FFFFFF;
    --text-secondary: #CCCCCC;
    --transition-base: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    --shadow-deep: 0 10px 20px rgba(0, 0, 0, 0.3);
    --shadow-soft: 0 5px 15px rgba(0, 255, 255, 0.2);
  }

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

  body {
    font-family: 'Roboto', sans-serif;
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-light));
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100%;
    padding-top: 80px;
  }

  .design-notice {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: rgba(0, 0, 0, 0.7);
    padding: 10px 15px;
    border-radius: 20px;
    font-size: 14px;
    z-index: 1000;
    backdrop-filter: blur(5px);
    border: 1px solid var(--accent-electric);
    box-shadow: var(--shadow-soft);
    animation: pulse 2s infinite;
  }

  @keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(0, 255, 255, 0.4); }
    70% { box-shadow: 0 0 0 10px rgba(0, 255, 255, 0); }
    100% { box-shadow: 0 0 0 0 rgba(0, 255, 255, 0); }
  }

  .navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: linear-gradient(90deg, var(--primary-dark), var(--primary-light));
    display: flex;
    justify-content: space-around;
    align-items: center;
    padding: 15px 0;
    z-index: 100;
    box-shadow: var(--shadow-deep);
  }

  .nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    padding: 8px 15px;
    border-radius: 20px;
    transition: var(--transition-base);
    position: relative;
  }

  .nav-link:hover {
    background: rgba(0, 255, 255, 0.2);
    transform: translateY(-3px);
  }

  .nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--accent-electric);
    transition: var(--transition-base);
  }

  .nav-link:hover::after {
    width: 70%;
  }

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

  .hero {
    height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    margin-bottom: 80px;
    border-radius: 20px;
    background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), 
                url('https://images.gptkong.com/demo/sample1.png') center/cover;
  }

  .hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, 
                transparent 65%, 
                rgba(0, 255, 255, 0.1) 65%, 
                rgba(0, 255, 255, 0.1) 70%, 
                transparent 70%),
                linear-gradient(-45deg, 
                transparent 65%, 
                rgba(0, 255, 255, 0.1) 65%, 
                rgba(0, 255, 255, 0.1) 70%, 
                transparent 70%);
    background-size: 30px 30px;
    opacity: 0.5;
  }

  .hero-content {
    text-align: center;
    z-index: 2;
    padding: 0 20px;
  }

  .hero h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    background: linear-gradient(to right, var(--accent-electric), var(--accent-neon));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-shadow: 0 0 10px rgba(0, 255, 255, 0.3);
  }

  .hero p {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto 30px;
    color: var(--text-secondary);
  }

  .btn {
    display: inline-block;
    padding: 12px 30px;
    background: linear-gradient(45deg, var(--accent-electric), var(--accent-neon));
    color: var(--primary-dark);
    border: none;
    border-radius: 30px;
    font-weight: bold;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-base);
    box-shadow: 0 5px 15px rgba(0, 255, 255, 0.4);
  }

  .btn:hover {
    transform: translateY(-5px) scale(1.05);
    box-shadow: 0 10px 20px rgba(0, 255, 255, 0.6);
  }

  article {
    background: rgba(26, 26, 46, 0.8);
    border-radius: 20px;
    padding: 40px;
    margin-bottom: 60px;
    box-shadow: var(--shadow-deep);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(0, 255, 255, 0.1);
  }

  article h2 {
    font-size: 2.2rem;
    margin-bottom: 30px;
    color: var(--accent-electric);
    position: relative;
    padding-bottom: 15px;
  }

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

  article h3 {
    font-size: 1.8rem;
    margin: 30px 0 20px;
    color: var(--accent-neon);
  }

  article p {
    margin-bottom: 20px;
    font-size: 1.1rem;
    line-height: 1.8;
  }

  article color {
    color: var(--accent-neon);
    font-weight: bold;
  }

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

  .image-card {
    position: relative;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: var(--shadow-soft);
    transition: var(--transition-base);
    height: 300px;
  }

  .image-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 255, 255, 0.3);
  }

  .image-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-base);
  }

  .image-card:hover img {
    transform: scale(1.1);
  }

  .image-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
  }

  table {
    width: 100%;
    border-collapse: collapse;
    margin: 30px 0;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 10px;
    overflow: hidden;
  }

  th, td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid rgba(0, 255, 255, 0.1);
  }

  th {
    background: rgba(0, 255, 255, 0.1);
    color: var(--accent-electric);
    font-weight: bold;
  }

  tr:hover {
    background: rgba(0, 255, 255, 0.05);
  }

  pre {
    background: rgba(0, 0, 0, 0.5);
    padding: 15px;
    border-radius: 8px;
    overflow-x: auto;
    border-left: 3px solid var(--accent-electric);
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.5;
    color: var(--accent-neon);
    margin: 15px 0;
  }

  code {
    font-family: 'Courier New', monospace;
    background: rgba(0, 0, 0, 0.3);
    padding: 2px 5px;
    border-radius: 3px;
    color: var(--accent-neon);
  }

  .scroll-indicator {
    position: fixed;
    top: 50%;
    right: 20px;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    gap: 15px;
    z-index: 90;
  }

  .indicator-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    border: 2px solid transparent;
    transition: var(--transition-base);
    cursor: pointer;
  }

  .indicator-dot.active {
    background: var(--accent-electric);
    transform: scale(1.3);
    border-color: var(--accent-neon);
  }

  .floating-elements {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
    overflow: hidden;
  }

  .floating-element {
    position: absolute;
    background: rgba(0, 255, 255, 0.1);
    border: 1px solid rgba(0, 255, 255, 0.3);
    border-radius: 50%;
    animation: float 15s infinite linear;
  }

  @keyframes float {
    0% { transform: translate(0, 0) rotate(0deg); }
    25% { transform: translate(50px, 50px) rotate(90deg); }
    50% { transform: translate(100px, 0) rotate(180deg); }
    75% { transform: translate(50px, -50px) rotate(270deg); }
    100% { transform: translate(0, 0) rotate(360deg); }
  }

  @media (max-width: 768px) {
    .navbar {
      flex-direction: column;
      padding: 10px;
      height: auto;
    }
    
    .nav-link {
      margin: 5px 0;
    }
    
    .hero h1 {
      font-size: 2rem;
    }
    
    article {
      padding: 20px;
    }
    
    .image-grid {
      grid-template-columns: 1fr;
    }
  }