/* Reset some defaults */
* {
  box-sizing: border-box;
}

body {
  font-family: 'Roboto', sans-serif;
  margin: 0;
  padding: 2rem;
  background: #f4f7fa;
  color: #2c3e50;
  line-height: 1.6;
}

h1,
h2,
h3 {
  color: #1a2b47;
}

h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

h2 {
  border-bottom: 2px solid #34495e;
  padding-bottom: 0.3rem;
  margin-top: 2rem;
  margin-bottom: 1rem;
}

h3 {
  margin-top: 1.2rem;
  margin-bottom: 0.6rem;
  color: #34495e;
}

.section {
  background: white;
  padding: 1.5rem 2rem;
  margin-bottom: 2rem;
  border-radius: 8px;
  box-shadow: 0 1px 8px rgba(0, 0, 0, 0.08);
}

.image-placeholder {
  text-align: center;
  margin: 1rem 0 1.5rem;
}

.code-title {
  font-weight: bold;
  background: #34495e;
  color: white;
  padding: 0.3rem 0.5rem;
  border-radius: 4px;
  margin-bottom: 0.3rem;
  font-family: monospace;
  font-size: 1rem;
}

pre {
  background: #2c3e50;
  color: #ecf0f1;
  padding: 0.7rem 1rem;
  overflow-x: auto;
  border-radius: 6px;
  font-size: 0.9rem;
}

table.dataTable {
  margin: 1rem auto;
  border-collapse: collapse;
}

footer {
  text-align: center;
  color: #888;
  font-size: 0.9rem;
  margin-top: 3rem;
}

footer a {
  color: #2980b9;
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}
.tab-buttons {
  list-style: none;
  padding: 0;
  margin: 20px auto;
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 10px 24px;
  font-size: 16px;
  font-weight: 500;
  border: 2px solid #2e7d32;
  border-radius: 6px;
  background-color: #e8f5e9;
  color: #2e7d32;
  cursor: pointer;
  transition: all 0.2s ease-in-out;
}

.tab-btn:hover {
  background-color: #c8e6c9;
  color: #1b5e20;
  border-color: #1b5e20;
}

.tab-btn.active {
  background-color: #2e7d32;
  color: white;
  border-color: #2e7d32;
  box-shadow: 0 3px 8px rgba(46, 125, 50, 0.3);
}

.tab-content {
  display: none;
  padding: 20px;
  border: 1px solid #ddd;
  border-radius: 8px;
  background-color: #f9f9f9;
  animation: fadeIn 0.3s ease-in-out;
}

.tab-content.active {
  display: block;
}

/* Optional subtle fade-in */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
#powerflowHeatmapContainer {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
  background: #fdfdfd;
  padding: 1.25rem;
  border-radius: 12px;
  border: 1px solid #ddd;
}

#powerFlowHeatmap {
  max-height: 400px;
  display: block;
  margin: 0 auto;
  background-color: #fafafa;
  border-radius: 8px;
  border: 2px solid #333;
}