:root {
    --primary: linear-gradient(135deg, #00c6ff, #0072ff);
    --secondary: rgba(0, 198, 255, 0.1);
    --accent: #39ff14;
    --text: #ffffff;
    --bg: #121212;
    --card-bg: rgba(255, 255, 255, 0.05);
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  }

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

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

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

  .header {
    position: relative;
    height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
  }

  .header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--primary);
    opacity: 0.8;
    z-index: -1;
  }

  .header-content {
    text-align: center;
    padding: 40px;
    backdrop-filter: blur(10px);
    background: rgba(0, 0, 0, 0.3);
    border-radius: 20px;
    max-width: 800px;
    margin: 0 auto;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    transform: translateY(20px);
    opacity: 0;
    animation: fadeIn 1s forwards 0.5s;
  }

  @keyframes fadeIn {
    to {
      opacity: 1;
      transform: translateY(0);
    }
  }

  h1, h2, h3, h4 {
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.3;
  }

  h1 {
    font-size: 3rem;
    background: linear-gradient(to right, #00c6ff, #39ff14);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 30px;
  }

  h2 {
    font-size: 2.2rem;
    color: #00c6ff;
    position: relative;
    padding-bottom: 10px;
    margin-top: 60px;
  }

  h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100px;
    height: 3px;
    background: linear-gradient(to right, #00c6ff, transparent);
  }

  h3 {
    font-size: 1.8rem;
    color: #c700ff;
    margin-top: 40px;
  }

  p {
    font-size: 1.1rem;
    margin-bottom: 20px;
    color: rgba(255, 255, 255, 0.8);
  }

  .card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin: 50px 0;
  }

  .card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 30px;
    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(-10px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
    border-color: rgba(0, 198, 255, 0.3);
  }

  .img-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin: 40px 0;
  }

  .decor-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    transition: var(--transition);
  }

  .decor-img:hover {
    transform: scale(1.03);
    box-shadow: 0 8px 25px rgba(0, 198, 255, 0.3);
  }

  pre {
    background: rgba(0, 0, 0, 0.3);
    border-radius: 10px;
    padding: 20px;
    margin: 30px 0;
    overflow-x: auto;
    border-left: 3px solid #00c6ff;
    font-family: 'Fira Code', monospace;
    position: relative;
  }

  pre::before {
    content: 'CSS';
    position: absolute;
    top: 0;
    right: 0;
    background: #00c6ff;
    color: #121212;
    padding: 5px 10px;
    border-radius: 0 0 0 10px;
    font-size: 0.8rem;
    font-weight: bold;
  }

  code {
    font-family: 'Fira Code', monospace;
    color: #39ff14;
    background: rgba(0, 198, 255, 0.1);
    padding: 2px 5px;
    border-radius: 3px;
  }

  .nav {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(10px);
    padding: 15px 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
  }

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

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

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

  .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: #00c6ff;
    transition: var(--transition);
  }

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

  .footer {
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(10px);
    padding: 40px 0;
    margin-top: 100px;
    text-align: center;
  }

  .notice {
    background: rgba(0, 198, 255, 0.1);
    border-left: 3px solid #00c6ff;
    padding: 20px;
    margin: 40px 0;
    border-radius: 0 5px 5px 0;
  }

  @media (max-width: 768px) {
    h1 {
      font-size: 2.2rem;
    }
    
    h2 {
      font-size: 1.8rem;
    }
    
    h3 {
      font-size: 1.5rem;
    }
    
    .header {
      height: 60vh;
    }
    
    .nav-links {
      gap: 15px;
    }
  }