:root {
  --primary: #0f2027;
  --secondary: #203a43;
  --accent: #4caf50;
  --text: #ffffff;
  --card-bg: rgba(255, 255, 255, 0.1);
  --transition: all 0.3s ease;
}

body {
  background: linear-gradient(135deg, var(--primary), var(--secondary), #2c5364);
  color: var(--text);
  font-family: 'Roboto', sans-serif;
  margin: 0;
  padding: 0;
  line-height: 1.6;
  min-height: 100%;
}

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

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

.header::after {
  content: '';
  display: block;
  width: 100px;
  height: 4px;
  background: var(--accent);
  margin: 1.5rem auto;
  border-radius: 2px;
}

h1, h2, h3, h4 {
  font-weight: 700;
  margin-top: 2rem;
  color: var(--text);
}

h2 {
  font-size: 2rem;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  padding: 1rem;
  border-radius: 8px;
  text-align: center;
}

h3 {
  font-size: 1.5rem;
  border-left: 4px solid var(--accent);
  padding-left: 1rem;
}

h4 {
  font-size: 1.2rem;
  color: #b8d8e0;
}

p {
  font-size: 1.1rem;
  margin: 1.5rem 0;
}

.card {
  background: var(--card-bg);
  backdrop-filter: blur(10px);
  border-radius: 15px;
  padding: 2rem;
  margin: 2rem 0;
  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(-5px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

pre {
  background: rgba(0,0,0,0.3);
  border-radius: 8px;
  padding: 1.5rem;
  overflow-x: auto;
  font-size: 0.9rem;
  margin: 1.5rem 0;
  border-left: 3px solid var(--accent);
}

code {
  font-family: 'Courier New', monospace;
  color: #b8d8e0;
}

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

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

.image-card:hover {
  transform: scale(1.03);
  box-shadow: 0 8px 16px rgba(0,0,0,0.3);
}

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

.note {
  background: rgba(76, 175, 80, 0.1);
  border-left: 4px solid var(--accent);
  padding: 1rem;
  margin: 1.5rem 0;
  border-radius: 0 8px 8px 0;
}

.footer-note {
  text-align: center;
  margin-top: 3rem;
  padding: 1rem;
  background: rgba(255,255,255,0.05);
  border-radius: 8px;
  font-size: 0.9rem;
}

@media (max-width: 768px) {
  .container {
    padding: 1rem;
  }
  
  h2 {
    font-size: 1.5rem;
  }
  
  .card {
    padding: 1.5rem;
  }
}

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

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