* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: #333;
  background: linear-gradient(135deg, #f5f7fa 0%, #e4edf9 100%);
  padding: 20px;
}
.container {
  max-width: 1200px;
  margin: 0 auto;
  background: white;
  border-radius: 15px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  overflow: hidden;
}
header {
  background: linear-gradient(90deg, #1a3a6c 0%, #2c5282 100%);
  color: white;
  padding: 40px 30px;
  text-align: center;
}
h1 {
  font-size: 2.8rem;
  margin-bottom: 15px;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}
.subtitle {
  font-size: 1.2rem;
  opacity: 0.9;
  max-width: 800px;
  margin: 0 auto;
}
.content {
  padding: 30px;
}
h2 {
  color: #1a3a6c;
  /* Dark blue as requested */
  font-size: 1.8rem;
  margin: 35px 0 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid #e2e8f0;
}
p {
  margin-bottom: 15px;
  font-size: 1.1rem;
  color: #4a5568;
}
.code-block {
  background: #f8fafc;
  border-left: 4px solid #4299e1;
  padding: 20px;
  margin: 20px 0;
  border-radius: 0 8px 8px 0;
  overflow-x: auto;
  font-family: "Courier New", monospace;
  color: black;
  /* Code text in black as requested */
}
.code-header {
  display: flex;
  justify-content: space-between;
  margin-bottom: 10px;
}
.language {
  background: #4299e1;
  color: white;
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.85rem;
}
pre {
  margin: 0;
  white-space: pre-wrap;
}
.section-intro {
  background: #ebf8ff;
  padding: 20px;
  border-radius: 10px;
  margin: 25px 0;
  border-left: 3px solid #3182ce;
}
footer {
  text-align: center;
  padding: 25px;
  background: #edf2f7;
  color: #4a5568;
  font-size: 0.95rem;
}
@media (max-width: 768px) {
  h1 {
    font-size: 2.2rem;
  }
  h2 {
    font-size: 1.5rem;
  }
  .content {
    padding: 20px;
  }
}
.images {
  display: flex;
  flex-direction: column;
  align-items: center;
  /* Horizontally centers images */
  justify-content: center;
  /* Vertically centers if container has height */
  gap: 30px;
  margin: 40px 0;
}
.images img {
  max-width: 90%;
  height: auto;
  border-radius: 10px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}
.images figcaption {
  text-align: center;
  font-size: 1rem;
  color: #4a5568;
  margin-top: 8px;
}