:root {
  --primary: #1B2437;
  --secondary: #2A3B55;
  --accent1: #3BC8E0;
  --accent2: #9D56FF;
  --text: #FFFFFF;
  --highlight: #4CAF50;
}

body {
  margin: 0;
  padding: 0;
  font-family: 'Montserrat', sans-serif;
  background: var(--primary);
  color: var(--text);
  line-height: 1.6;
}

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

.header {
  text-align: center;
  padding: 40px 0;
  background: linear-gradient(135deg, var(--accent1), var(--accent2));
  margin-bottom: 40px;
  border-radius: 0 0 20px 20px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.header h1 {
  font-size: 2.5rem;
  margin: 0;
  text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.notice {
  background: rgba(255,255,255,0.1);
  padding: 15px;
  border-radius: 8px;
  text-align: center;
  margin: 20px 0;
  border-left: 4px solid var(--accent1);
}

.content-grid {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: 30px;
}

.nav-sidebar {
  position: sticky;
  top: 20px;
  height: fit-content;
}

.nav-menu {
  background: var(--secondary);
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.nav-menu h3 {
  color: var(--accent1);
  margin-top: 0;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  padding-bottom: 10px;
}

.nav-menu ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-menu li {
  margin: 15px 0;
}

.nav-menu a {
  color: var(--text);
  text-decoration: none;
  transition: all 0.3s ease;
  display: block;
  padding: 8px 12px;
  border-radius: 6px;
}

.nav-menu a:hover {
  background: rgba(59,200,224,0.2);
  color: var(--accent1);
  transform: translateX(5px);
}

article {
  background: var(--secondary);
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

article h2 {
  color: var(--accent1);
  font-size: 1.8rem;
  margin-top: 40px;
  border-bottom: 2px solid var(--accent2);
  padding-bottom: 10px;
}

article h3 {
  color: var(--accent2);
  font-size: 1.4rem;
  margin-top: 30px;
}

article p {
  margin: 20px 0;
  font-size: 1.1rem;
}

pre {
  background: rgba(27,36,55,0.8);
  border-left: 4px solid var(--accent1);
  border-radius: 0 8px 8px 0;
  padding: 20px;
  overflow-x: auto;
  margin: 25px 0;
  font-family: 'Courier New', monospace;
  font-size: 0.95rem;
  line-height: 1.5;
}

code {
  color: var(--accent1);
  background: rgba(59,200,224,0.1);
  padding: 2px 5px;
  border-radius: 3px;
  font-family: 'Courier New', monospace;
}

.image-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
  margin: 30px 0;
}

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

.gallery-image:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0,0,0,0.4);
}

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

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

.footer {
  text-align: center;
  padding: 30px 0;
  margin-top: 50px;
  border-top: 1px solid rgba(255,255,255,0.1);
}

@media (max-width: 900px) {
  .content-grid {
    grid-template-columns: 1fr;
  }
  
  .nav-sidebar {
    position: static;
    margin-bottom: 30px;
  }
  
  article {
    padding: 20px;
  }
}

@media (max-width: 600px) {
  .header h1 {
    font-size: 2rem;
  }
  
  article h2 {
    font-size: 1.5rem;
  }
  
  article h3 {
    font-size: 1.2rem;
  }
  
  .image-gallery {
    grid-template-columns: 1fr;
  }
}

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

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