body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  padding: 0;
  background-color: #f0f2f5;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  color: #333;
}

.container {
  display: flex;
  flex-direction: column;
  height: 90vh;
  width: 90vw;
  max-width: 1200px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  background-color: #fff;
  border-radius: 8px;
  overflow: hidden;
}

header {
  background-color: #007bff;
  color: #fff;
  padding: 10px 20px;
  text-align: center;
  font-size: 1.5rem;
}

.sidebar {
  background-color: #f8f9fa;
  padding: 20px;
  width: 200px;
  box-shadow: 2px 0 5px rgba(0, 0, 0, 0.1);
}

.sidebar nav ul {
  list-style-type: none;
  padding: 0;
}

.sidebar nav ul li {
  margin: 10px 0;
}

.sidebar nav ul li a {
  color: #007bff;
  text-decoration: none;
  font-weight: bold;
  transition: color 0.3s;
}

.sidebar nav ul li a:hover {
  color: #0056b3;
}

main {
  flex-grow: 1;
  padding: 20px;
  background-color: #f0f2f5;
  overflow-y: auto;
}

footer {
  background-color: #f8f9fa;
  text-align: center;
  padding: 10px;
  font-size: 0.9rem;
}

#calendar-section,
#events-section,
#settings-section {
  display: none; /* Hide all sections initially */
}

#calendar-section.active,
#events-section.active,
#settings-section.active {
  display: block; /* Only show the active section */
}

.hidden {
  display: none;
}

#calendar {
  max-width: 100%;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .container {
      flex-direction: row;
  }
  main {
      padding: 40px;
  }
}