:root {
  --primary: linear-gradient(135deg, #2196F3, #21CBF3);
  --secondary: #2C3E50;
  --accent: #FF9800;
  --text: #333;
  --light: #ECF0F1;
  --dark: #121212;
  --card-bg: #fff;
  --shadow: 0 4px 12px rgba(0,0,0,0.1);
}

body {
  font-family: 'Roboto', sans-serif;
  line-height: 1.6;
  color: var(--text);
  background: var(--light);
  margin: 0;
  padding: 0;
  min-height: 100%;
}

.header {
  background: var(--primary);
  color: white;
  padding: 2rem;
  text-align: center;
  border-radius: 0 0 20px 20px;
  margin-bottom: 3rem;
  box-shadow: var(--shadow);
}

.header h1 {
  font-size: 2.5rem;
  margin: 0;
  text-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.notice {
  background: rgba(255,255,255,0.2);
  padding: 1rem;
  border-radius: 8px;
  margin-top: 1rem;
  display: inline-block;
}

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

article {
  background: var(--card-bg);
  border-radius: 12px;
  padding: 2rem;
  margin-bottom: 3rem;
  box-shadow: var(--shadow);
}

h2 {
  color: #2196F3;
  font-size: 1.8rem;
  margin-top: 2rem;
  border-bottom: 2px solid #21CBF3;
  padding-bottom: 0.5rem;
}

h3 {
  color: #2C3E50;
  font-size: 1.5rem;
  margin-top: 1.5rem;
}

p {
  font-size: 1.1rem;
  margin: 1rem 0;
}

pre {
  background: #f5f5f5;
  border-radius: 8px;
  padding: 1rem;
  overflow-x: auto;
  margin: 1.5rem 0;
  border-left: 4px solid var(--accent);
}

code {
  font-family: 'Courier New', monospace;
  color: #333;
}

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

.image-card {
  background: white;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 8px 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 8px 16px rgba(0,0,0,0.2);
}

.image-card img {
  width: 100%;
  height: auto;
  display: block;
}

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

.nav-link {
  background: var(--primary);
  color: white;
  padding: 0.8rem 1.5rem;
  border-radius: 30px;
  text-decoration: none;
  font-weight: bold;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.nav-link:hover {
  transform: translateY(-3px);
  box-shadow: 0 4px 8px rgba(0,0,0,0.2);
}

@media (max-width: 768px) {
  .container {
    padding: 0 1rem;
  }
  
  .header h1 {
    font-size: 2rem;
  }
  
  article {
    padding: 1.5rem;
  }
  
  .image-grid {
    grid-template-columns: 1fr;
  }
}

@keyframes float {
  0% { transform: translateY(0px); }
  50% { transform: translateY(-10px); }
  100% { transform: translateY(0px); }
}

.floating {
  animation: float 3s ease-in-out infinite;
}