:root {
    --primary: #121212;
    --secondary: #1E1E1E;
    --accent: #00FFFF;
    --accent2: #8A2BE2;
    --text: #FFFFFF;
    --text-secondary: #B0B0B0;
    --radius: 12px;
    --shadow: 0 4px 20px rgba(0, 255, 255, 0.1);
    --transition: all 0.3s ease;
  }

  @font-face {
    font-family: 'Inter';
    src: url('https://fonts.gstatic.com/s/inter/v12/UcCO3FwrK3iLTeHuS_fvQtMwCp50KnMw2boKoduKmMEVuLyfMZg.ttf') format('truetype');
  }

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

  body {
    font-family: 'Inter', sans-serif;
    background: var(--primary);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
    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) 0%, rgba(30,30,30,0.9) 100%);
    padding: 20px 0;
    z-index: 1000;
    box-shadow: 0 2px 30px rgba(0,0,0,0.5);
    backdrop-filter: blur(10px);
  }

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

  .logo {
    font-size: 1.8rem;
    font-weight: 700;
    background: linear-gradient(45deg, var(--accent), var(--accent2));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-decoration: none;
  }

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

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

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

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

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

  .hero {
    padding: 100px 0;
    background: radial-gradient(circle at 30% 50%, rgba(30,30,30,0.8) 0%, var(--primary) 70%);
    position: relative;
    overflow: hidden;
  }

  .hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: url('https://images.gptkong.com/demo/sample1.png') center/cover no-repeat;
    opacity: 0.05;
    pointer-events: none;
    animation: rotate 120s linear infinite;
  }

  @keyframes rotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
  }

  .hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
  }

  .hero h1 {
    font-size: 3.5rem;
    margin-bottom: 20px;
    background: linear-gradient(45deg, var(--accent), var(--accent2));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    line-height: 1.2;
  }

  .hero p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
  }

  .notice {
    background: rgba(0, 255, 255, 0.1);
    border-left: 4px solid var(--accent);
    padding: 15px;
    margin: 40px 0;
    border-radius: 0 var(--radius) var(--radius) 0;
  }

  .notice p {
    color: var(--text);
    font-size: 0.9rem;
  }

  article {
    padding: 60px 0;
  }

  article h2 {
    font-size: 2.5rem;
    margin-bottom: 30px;
    color: var(--accent);
    position: relative;
    padding-bottom: 15px;
  }

  article h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent2));
    border-radius: 3px;
  }

  article h3 {
    font-size: 1.8rem;
    margin: 40px 0 20px;
    color: var(--text);
  }

  article p {
    font-size: 1.1rem;
    margin-bottom: 20px;
    color: var(--text-secondary);
  }

  .content-block {
    background: var(--secondary);
    border-radius: var(--radius);
    padding: 40px;
    margin: 40px 0;
    box-shadow: var(--shadow);
    transition: var(--transition);
  }

  .content-block:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 255, 255, 0.2);
  }

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

  .image-card {
    position: relative;
    border-radius: var(--radius);
    overflow: hidden;
    aspect-ratio: 1/1;
    transition: var(--transition);
  }

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

  .image-card:hover {
    transform: scale(1.03);
    box-shadow: 0 10px 30px rgba(0, 255, 255, 0.3);
  }

  .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(45deg, rgba(0, 255, 255, 0.1), rgba(138, 43, 226, 0.1));
    opacity: 0;
    transition: var(--transition);
  }

  .image-card:hover::after {
    opacity: 1;
  }

  pre {
    background: #1a1a1a;
    border-radius: var(--radius);
    padding: 20px;
    margin: 30px 0;
    overflow-x: auto;
    box-shadow: inset 0 0 10px rgba(0,0,0,0.5);
    position: relative;
  }

  pre::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(to bottom, var(--accent), var(--accent2));
    border-radius: var(--radius) 0 0 var(--radius);
  }

  code {
    font-family: 'Courier New', monospace;
    color: var(--accent);
    font-size: 0.9rem;
    line-height: 1.5;
  }

  .footer {
    background: var(--secondary);
    padding: 40px 0;
    text-align: center;
    margin-top: 80px;
  }

  .footer p {
    color: var(--text-secondary);
    font-size: 0.9rem;
  }

  @media (max-width: 768px) {
    .hero h1 {
      font-size: 2.5rem;
    }
    
    .nav-links {
      display: none;
    }
    
    .content-block {
      padding: 30px;
    }
    
    article h2 {
      font-size: 2rem;
    }
    
    article h3 {
      font-size: 1.5rem;
    }
  }

  /* Particle animation */
  .particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
  }

  .particle {
    position: absolute;
    width: 2px;
    height: 2px;
    background: var(--accent);
    border-radius: 50%;
    opacity: 0.5;
    animation: float 15s infinite linear;
  }

  @keyframes float {
    0% {
      transform: translateY(0) translateX(0);
      opacity: 0;
    }
    10% {
      opacity: 0.5;
    }
    90% {
      opacity: 0.5;
    }
    100% {
      transform: translateY(-100vh) translateX(100px);
      opacity: 0;
    }
  }

  /* Tooltip */
  .tooltip {
    position: relative;
    display: inline-block;
    border-bottom: 1px dotted var(--accent);
    cursor: help;
  }

  .tooltip .tooltiptext {
    visibility: hidden;
    width: 200px;
    background-color: var(--secondary);
    color: var(--text);
    text-align: center;
    border-radius: 6px;
    padding: 10px;
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0;
    transition: opacity 0.3s;
    box-shadow: 0 0 20px rgba(0,0,0,0.3);
    font-size: 0.9rem;
  }

  .tooltip:hover .tooltiptext {
    visibility: visible;
    opacity: 1;
  }

  /* Scroll indicator */
  .scroll-indicator {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: rgba(30,30,30,0.7);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: var(--transition);
    z-index: 999;
    border: 1px solid var(--accent);
    opacity: 0.7;
  }

  .scroll-indicator:hover {
    opacity: 1;
    transform: scale(1.1);
    background: rgba(30,30,30,0.9);
  }

  .scroll-indicator svg {
    width: 20px;
    height: 20px;
    fill: var(--accent);
  }