.demo-section {
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
}

.demo-section h2 {
  font-size: 1.8rem;
  margin-bottom: var(--spacing-sm);
  color: var(--text-primary);
}

.section-desc {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
}

.border-container {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.demo-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  align-items: stretch;
}

@media (max-width: 768px) {
  .demo-layout {
    grid-template-columns: 1fr;
  }
}

.controls-sidebar {
  padding: var(--spacing-md);
  border-right: 1px solid var(--border);
  background: var(--bg-color);
}

.control-group {
  margin-bottom: 1rem;
}

.control-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
  color: var(--text-primary);
}

.control-group input[type="range"] {
  width: 100%;
}

.control-group select {
  width: 100%;
  padding: 0.4rem;
  border-radius: 4px;
  border: 1px solid var(--border);
  font-family: var(--font-family);
  background: var(--surface);
}

.radio-group label {
  font-weight: normal;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.2rem;
  cursor: pointer;
}

.demo-area {
  padding: var(--spacing-md);
  display: flex;
  flex-direction: column;
  background: var(--surface);
}

.interactive-area {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 250px;
  position: relative;
}

.transform-area .grid-background {
  flex: 1;
  min-height: 250px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-image: 
    linear-gradient(to right, var(--border) 1px, transparent 1px),
    linear-gradient(to bottom, var(--border) 1px, transparent 1px);
  background-size: 20px 20px;
  background-position: center center;
  border: 1px dashed #ccc;
  margin-bottom: var(--spacing-md);
  overflow: hidden;
}

.code-preview {
  background: #111;
  color: #fff;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: 4px;
  font-family: monospace;
  font-size: 0.9rem;
  text-align: center;
  margin-top: auto;
}

.code-preview code {
  color: var(--primary);
}

/* Section Components */

/* Transition Target */
.transition-box {
  background: var(--primary);
  color: var(--secondary);
  padding: var(--spacing-md) var(--spacing-lg);
  border-radius: var(--radius);
  font-weight: bold;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  text-align: center;
}

.transition-box:hover {
  background: var(--secondary);
  color: var(--surface);
  transform: scale(1.1) translateY(-10px);
  box-shadow: 0 10px 20px rgba(0,0,0,0.2);
  border-radius: 30px;
}

/* Transform Target */
.transform-box {
  width: 80px;
  height: 80px;
  background: var(--primary);
  color: var(--secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  font-weight: bold;
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  /* A subtle border to show edges clearly during rotation/skew */
  border: 2px solid var(--secondary);
}

/* Animation Targets */
.animation-box {
  width: 60px;
  height: 60px;
  background: var(--primary);
  border-radius: 50%; /* Circle by default */
}

/* Keyframes Definitions */
@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-80px); }
}

@keyframes spin {
  0% { transform: rotate(0deg); border-radius: var(--radius); }
  50% { transform: rotate(180deg); border-radius: 50%; }
  100% { transform: rotate(360deg); border-radius: var(--radius); }
}

@keyframes pulse {
  0% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.5); opacity: 0.5; }
  100% { transform: scale(1); opacity: 1; }
}

/* Animation state classes assigned by JS */
.bounce { animation-name: bounce; }
.spin { animation-name: spin; background-color: var(--secondary); border-radius: var(--radius); }
.pulse { animation-name: pulse; }