body {
  font-family: Arial, sans-serif;
  background-color: #f4f4f9;
  margin: 0;
  padding: 0;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  min-height: 100vh;
}

.container {
  margin-top: 50px;
  background-color: #fff;
  padding: 30px;
  border-radius: 10px;
  width: 100%;
  max-width: 400px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.1);
}

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

.input-group {
  display: flex;
  gap: 10px;
  margin-bottom: 20px;
}

input[type="text"] {
  flex: 1;
  padding: 10px;
  font-size: 16px;
}

button {
  padding: 10px 20px;
  font-size: 16px;
  background-color: #3498db;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

button:hover {
  background-color: #2980b9;
}

ul {
  list-style: none;
  padding: 0;
}

li {
  background: #eee;
  padding: 12px 16px;
  margin-bottom: 15px;
  border-radius: 5px;
  display: flex;
  align-items: center;
  gap: 12px;
  justify-content: space-between;
}

li .checkbox {
  transform: scale(1.3);
  cursor: pointer;
}

li span {
  flex: 1;
  font-size: 16px;
}

li.completed span {
  text-decoration: line-through;
  color: #999;
  opacity: 0.7;
}

li button {
  background: #e74c3c;
  border: none;
  color: white;
  padding: 6px 10px;
  border-radius: 4px;
  cursor: pointer;
}

li button:hover {
  background: #c0392b;
}

.edit-button {
  background: #f39c12;
  border: none;
  color: white;
  padding: 6px 10px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 16px;
}

.edit-button:hover {
  background: #d68910;
}

.edit-input {
  flex: 1;
  font-size: 16px;
  padding: 6px;
}

#search-task {
  width: 94%;
  padding: 10px;
  margin-bottom: 20px;
  font-size: 16px;
  border: 2px solid #ccc;
  border-radius: 5px;
}