body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #121212;
  color: #e0e0e0;
  padding: 20px;
}

body.light-theme {
  background: #f9f9f9;
  color: #333;
}

.main-layout {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  justify-content: center;
}

.container {
  flex: 2;
  max-width: 1000px;
}

.sidebar {
  flex: 1;
  min-width: 250px;
  max-height: 600px;
  overflow-y: auto;
  background: #1e1e1e;
  padding: 15px;
  border: 1px solid #333;
  border-radius: 8px;
  margin-top: 20px;
}

body.light-theme .sidebar {
  background: #ffffff;
  border: 1px solid #ddd;
}

.sidebar h2 {
  text-align: center;
  margin-bottom: 10px;
  color: #ffcc00;
}

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

.sidebar li {
  background: #2a2a2a;
  margin: 5px 0;
  padding: 10px;
  border-radius: 6px;
  font-size: 14px;
  border-left: 4px solid #0073b1;
  color: #e0e0e0;
}

body.light-theme .sidebar li {
  background: #f4f4f4;
  border-left: 4px solid #0073b1;
  color: #333;
}

h1 {
  text-align: center;
  margin-bottom: 20px;
  color: #ffcc00;
}

.controls {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 20px;
}

select, button {
  padding: 8px 10px;
  background: #1e1e1e;
  color: #e0e0e0;
  border: 1px solid #333;
  border-radius: 4px;
  cursor: pointer;
}

body.light-theme select, body.light-theme button {
  background: #ffffff;
  color: #333;
  border: 1px solid #ccc;
}

#calendar {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 5px;
}

.day-name {
  font-weight: bold;
  text-align: center;
  background: #2a2a2a;
  padding: 10px;
  border-radius: 4px;
  color: #ffcc00;
}

body.light-theme .day-name {
  background: #f4f4f4;
  color: #333;
}

.cell {
  background: #1e1e1e;
  padding: 10px;
  height: 120px;
  border: 1px solid #333;
  border-radius: 6px;
  cursor: pointer;
  position: relative;
  overflow-y: auto;
  color: #e0e0e0;
}

body.light-theme .cell {
  background: #ffffff;
  border: 1px solid #ddd;
  color: #333;
}

.cell:hover {
  background: #333;
}

body.light-theme .cell:hover {
  background: #f0f0f0;
}

.cell strong {
  display: block;
  font-size: 14px;
  margin-bottom: 5px;
}

.cell .event {
  font-size: 12px;
  background: #0073b1;
  padding: 3px 6px;
  border-radius: 4px;
  margin-top: 4px;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  cursor: pointer;
  color: #fff;
}

body.light-theme .cell .event {
  background: #005a8d;
  color: #fff;
}

.cell .event:hover {
  background: #005a8d;
}

body.light-theme .cell .event:hover {
  background: #00416d;
}

.delete-icon {
  float: right;
  margin-left: 6px;
  color: #ff4d4d;
  font-weight: bold;
  cursor: pointer;
}

body.light-theme .delete-icon {
  color: #ff0000;
}

#upcomingEventsList {
  padding: 0;
  margin-top: 10px;
}

#upcomingEventsList li {
  list-style: square;
  margin-bottom: 5px;
  color: #ffcc00;
}

body.light-theme #upcomingEventsList li {
  color: #0073b1;
}

.edit-btn, .delete-btn {
  margin-top: 5px;
  padding: 5px 10px;
  font-size: 12px;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

.edit-btn {
  background-color: #0073b1;
  color: #fff;
}

.edit-btn:hover {
  background-color: #005a8d;
}

.delete-btn {
  background-color: #ff4d4d;
  color: #fff;
}

.delete-btn:hover {
  background-color: #cc0000;
}

.tag-filters {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin: 10px 0;
}

.tag-filters button {
  padding: 8px 12px;
  background: #0073b1;
  color: #fff;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

.tag-filters button:hover {
  background: #005a8d;
}

body.light-theme .tag-filters button {
  background: #005a8d;
  color: #fff;
}

body.light-theme .tag-filters button:hover {
  background: #00416d;
}