body {
  font-family: sans-serif;
  padding: 30px;
  margin: 0;
  background: #f2f2f2;
  transition: background 0.3s ease;
}

#todobox {
  max-width: 1200px;
  margin: auto;
  background: #fff;
  color: #000;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
  transition: background 0.3s ease, color 0.3s ease;
}

input[type="text"],
input[type="file"] {
  width: 95%;
  padding: 10px;
  margin: 10px 0;
}

#preview {
  display: none;
  max-width: 100px;
  margin-bottom: 10px;
  border-radius: 8px;
}

.theme-switcher {
  max-width: 600px;
  margin: auto;
  text-align: center;
  margin-bottom: 10px;
}

.color-button {
  border: 1px solid #ccc;
  width: 30px;
  height: 30px;
  cursor: pointer;
  margin: 0 3px;
  border-radius: 4px;
}

.controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

button {
  padding: 10px 15px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

#addtask {
  background: #28a745;
  color: #fff;
}

#deleteselected {
  background: #ff9800;
  color: #fff;
}

.subtask-controls {
  display: flex;
  gap: 8px;
  margin-top: 6px;
}

.subtask-controls input[type="text"] {
  flex: 1;
  padding: 6px;
  border: 1px solid #ccc;
  border-radius: 4px;
}

.subtask-controls button {
  padding: 6px 12px;
  background-color: #2196f3;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

.subtask-list {
  padding-left: 20px;
}

.subtask-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin: 5px 0;
}

.subtask-item span {
  padding-left: 8px;
  flex: 1;
}

.task-complete-animation {
  animation: pulseZoom 0.6s ease-in-out;
  background-color: #d4edda !important;
}

@keyframes pulseZoom {
  0% { transform: scale(1); box-shadow: 0 0 0 rgba(0,0,0,0); }
  50% { transform: scale(1.05); box-shadow: 0 0 15px rgba(0, 255, 100, 0.5); }
  100% { transform: scale(1); box-shadow: 0 0 0 rgba(0,0,0,0); }
}