/* Default: Dark Mode */
:root {
  --bg-color: #121212;
  --text-color: #ffffff;
  --card-color: #1e1e1e;
  --accent-color: #4cafef;
}

body.light {
  --bg-color: #ffffff;
  --text-color: #000000;
  --card-color: #f4f4f4;
  --accent-color: #1976d2;
}

body {
  background: var(--bg-color);
  color: var(--text-color);
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  transition: background 0.3s, color 0.3s;
}

.app-container {
  max-width: 500px;
  margin: 50px auto;
  padding: 20px;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

h1 {
  margin: 0;
  font-size: 1.8rem;
}

#theme-toggle {
  padding: 8px 12px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  background: var(--accent-color);
  color: white;
  transition: background 0.3s;
}

#theme-toggle:hover {
  opacity: 0.9;
}

.todo-input {
  margin: 20px 0;
  display: flex;
  gap: 10px;
}

#task-input {
  flex: 1;
  padding: 10px;
  border: 1px solid var(--accent-color);
  border-radius: 5px;
  background: var(--card-color);
  color: var(--text-color);
}

#add-task {
  padding: 10px 20px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  background: var(--accent-color);
  color: white;
  transition: background 0.3s;
}

#add-task:hover {
  opacity: 0.9;
}

#task-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.task-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--card-color);
  margin-bottom: 10px;
  padding: 12px;
  border-radius: 8px;
  transition: background 0.3s;
}

.task-item.completed span {
  text-decoration: line-through;
  opacity: 0.6;
}

.task-actions {
  display: flex;
  gap: 10px;
}

.task-actions button {
  border: none;
  background: transparent;
  cursor: pointer;
  font-size: 1.1rem;
  color: var(--accent-color);
  transition: transform 0.2s;
}

.task-actions button:hover {
  transform: scale(1.2);
}