.sim-container {
  max-width: 1200px;
  margin: 0 auto;
  background: var(--secondary-bg-color);
  overflow: hidden;
}

.sim-header {
  color: var(--body-text-color);
  padding: 30px;
  text-align: center;
  font-size: 28px;
  font-weight: 600;
  background: var(--primary-bg-color);
}

.sim-controls-container {
  padding: 30px;
  background: var(--primary-bg-color);
}

.sim-controls {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
  margin-bottom: 25px;
}

.sim-control-group {
  padding: 15px;
  border-radius: 8px;
}

.sim-control-group label {
  display: block;
  font-weight: 600;
  color: var(--primary-text-color);
  margin-bottom: 8px;
  font-size: 14px;
}

.sim-control-group input {
  width: 100%;
  padding: 10px 12px;
  border: 2px solid var(--border-color);
  border-radius: 6px;
  font-size: 16px;
  transition: border-color 0.3s ease;
  background: var(--primary-dark);
  color: var(--primary-text-color);
}

.sim-control-group input:focus {
  outline: none;
  border-color: var(--link-color);
}

.sim-control-group .sim-note {
  font-size: 12px;
  color: var(--link-color);
  margin-top: 6px;
  font-style: italic;
}

.sim-button-container {
  text-align: center;
}

.sim-button {
  padding: 14px 40px;
  color: var(--primary-text-color);
  background: var(--primary-dark);
  border: 2px solid var(--border-color);
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
  transition: transform 0.2s ease, box-shadow 0.3s ease;
}

.sim-button:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
  border-color: var(--link-color);
}

.sim-button:active {
  transform: translateY(0);
}

.sim-chart-container {
  padding: 30px;
  background: var(--secondary-bg-color);
  position: relative;
  height: 500px;
}

@media (max-width: 768px) {
  .sim-controls {
    grid-template-columns: 1fr;
  }
  .sim-chart-container {
    height: 400px;
    padding: 20px;
  }
  .sim-header {
    font-size: 22px;
    padding: 20px;
  }
}