:root {
  --primary-color: #007BFF;
  --secondary-color: #28A745;
  --highlight-color: #FFC107;
  --background-color: #f5f5f5;
  --text-color: #333;
  --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

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

body {
  background: linear-gradient(135deg, #f5f7fa 0%, #e4e8f0 100%);
  font-family: 'Roboto', sans-serif;
  color: var(--text-color);
  line-height: 1.6;
  padding: 0;
  margin: 0;
}

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

.header {
  text-align: center;
  margin-bottom: 3rem;
  position: relative;
  padding: 2rem 0;
}

.header::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 150px;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  border-radius: 2px;
}

h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.subtitle {
  font-size: 1.2rem;
  color: #666;
  margin-bottom: 1.5rem;
}

.notice {
  background: rgba(255, 255, 255, 0.9);
  border-left: 4px solid var(--highlight-color);
  padding: 1rem;
  margin-bottom: 2rem;
  border-radius: 0 4px 4px 0;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.article-container {
  background: white;
  border-radius: 12px;
  box-shadow: var(--card-shadow);
  padding: 2.5rem;
  margin-bottom: 3rem;
}

article h2 {
  font-size: 1.8rem;
  margin: 2rem 0 1.5rem;
  color: var(--primary-color);
  position: relative;
  padding-bottom: 0.5rem;
}

article h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  border-radius: 3px;
}

article p {
  font-size: 1.1rem;
  margin-bottom: 1.5rem;
  line-height: 1.8;
}

pre {
  background: #282c34;
  border-radius: 8px;
  padding: 1.5rem;
  margin: 1.5rem 0;
  overflow-x: auto;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

code {
  font-family: 'Fira Code', monospace;
  color: #abb2bf;
  font-size: 0.95rem;
}

.image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.image-card {
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.image-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.image-card img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.5s ease;
}

.image-card:hover img {
  transform: scale(1.05);
}

.nav-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 2rem 0;
}

.nav-link {
  padding: 0.8rem 1.5rem;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  border-radius: 50px;
  text-decoration: none;
  font-weight: 500;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.nav-link:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 15px rgba(0, 0, 0, 0.15);
}

.footer {
  text-align: center;
  padding: 2rem;
  color: #666;
  font-size: 0.9rem;
}

@media (max-width: 768px) {
  .container {
    padding: 1.5rem;
  }
  
  .article-container {
    padding: 1.5rem;
  }
  
  h1 {
    font-size: 2rem;
  }
  
  article h2 {
    font-size: 1.5rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 1rem;
  }
  
  .image-grid {
    grid-template-columns: 1fr;
  }
  
  .nav-links {
    flex-direction: column;
    align-items: center;
  }
  
  .nav-link {
    width: 100%;
    text-align: center;
  }
}