:root {
    --primary: #1E213A;
    --secondary: #7800FF;
    --accent: #FF9F43;
    --highlight: #4CAF50;
    --text: #FFFFFF;
    --card-bg: #2E2E42;
    --transition: all 0.3s ease;
  }

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

  body {
    background: linear-gradient(135deg, var(--primary), var(--secondary), var(--accent));
    color: var(--text);
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    padding-top: 80px;
  }

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

  .header {
    text-align: center;
    padding: 40px 0;
    position: relative;
    overflow: hidden;
  }

  .header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 200px;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--highlight), transparent);
    animation: pulse 3s infinite;
  }

  @keyframes pulse {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
  }

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

  h1 { font-size: 2.5rem; }
  h2 { font-size: 2rem; color: var(--highlight); }
  h3 { font-size: 1.5rem; }
  h4 { font-size: 1.2rem; }

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

  .navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(30, 33, 58, 0.9);
    backdrop-filter: blur(10px);
    padding: 15px 0;
    z-index: 1000;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  }

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

  .nav-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text);
    text-decoration: none;
  }

  .nav-menu {
    display: flex;
    list-style: none;
  }

  .nav-item {
    margin-left: 30px;
    position: relative;
  }

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

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

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

  .content-section {
    background-color: rgba(46, 46, 66, 0.7);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 40px;
    margin-bottom: 40px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    transition: var(--transition);
  }

  .content-section:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
  }

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

  .card {
    background-color: var(--card-bg);
    border-radius: 15px;
    padding: 25px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
  }

  .card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(45deg, transparent, rgba(120, 0, 255, 0.1), transparent);
    transform: rotate(45deg);
    transition: var(--transition);
  }

  .card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 25px rgba(0, 0, 0, 0.2);
  }

  .card:hover::before {
    animation: shine 1.5s;
  }

  @keyframes shine {
    0% { left: -50%; }
    100% { left: 150%; }
  }

  .image-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin: 30px 0;
  }

  .decorative-image {
    width: 100%;
    height: auto;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    transition: var(--transition);
    aspect-ratio: 1/1;
    object-fit: cover;
  }

  .decorative-image:hover {
    transform: scale(1.05);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
  }

  pre {
    background-color: rgba(30, 33, 58, 0.8);
    border-radius: 10px;
    padding: 20px;
    margin: 20px 0;
    overflow-x: auto;
    font-family: 'Courier New', monospace;
    position: relative;
    border-left: 4px solid var(--highlight);
  }

  pre::before {
    content: 'CSS';
    position: absolute;
    top: 0;
    right: 0;
    background-color: var(--highlight);
    color: white;
    padding: 2px 10px;
    border-bottom-left-radius: 5px;
    font-size: 0.8rem;
  }

  code {
    color: #FF9F43;
    font-family: 'Courier New', monospace;
  }

  .button {
    display: inline-block;
    background-color: var(--highlight);
    color: white;
    padding: 12px 25px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    box-shadow: 0 5px 15px rgba(76, 175, 80, 0.3);
    margin: 10px 0;
  }

  .button:hover {
    background-color: #45a049;
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(76, 175, 80, 0.4);
  }

  .footer {
    text-align: center;
    padding: 30px 0;
    margin-top: 50px;
    background-color: rgba(30, 33, 58, 0.8);
    backdrop-filter: blur(10px);
  }

  .notice {
    background-color: var(--highlight);
    color: white;
    padding: 15px;
    text-align: center;
    margin-bottom: 30px;
    border-radius: 10px;
    font-weight: 600;
  }

  @media (max-width: 768px) {
    .nav-menu {
      display: none;
    }
    
    h1 { font-size: 2rem; }
    h2 { font-size: 1.7rem; }
    h3 { font-size: 1.3rem; }
    
    .content-section {
      padding: 25px;
    }
  }