.app-container {
  display: flex;
  flex-direction: column;
  height: 100vh;
  min-width: 1280px;
  font-family: var(--font-family);
}

.main-content {
  display: flex;
  flex: 1;
  overflow: hidden;
}

.theme-toggle-button {
  position: fixed;
  bottom: var(--spacing-lg);
  right: var(--spacing-lg);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: var(--border-width) solid var(--border);
  background-color: var(--surface);
  color: var(--text);
  font-size: var(--font-size-lg);
  cursor: pointer;
  z-index: 1000;
  transition: background-color var(--transition-normal);
}

.theme-toggle-button:hover {
  background-color: var(--hover);
}

/* Responsive design */
@media (max-width: 1280px) {
  .app-container {
    min-width: auto;
  }
}

@media (max-width: 768px) {
  .main-content {
    flex-direction: column;
  }
}