* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  background: #f4f4f4;
  color: #333;
}

.container {
  max-width: 600px;
  margin: 50px auto;
  background: white;
  padding: 20px;
  border-radius: 10px;
  box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

h1 {
  text-align: center;
  margin-bottom: 20px;
  color: #4a90e2;
}

.input-area {
  display: flex;
  margin-bottom: 20px;
}

#taskInput {
  flex: 1;
  padding: 12px;
  font-size: 16px;
  border: 1px solid #ddd;
  border-radius: 5px 0 0 5px;
}

#addBtn {
  padding: 12px 20px;
  background: #4a90e2;
  color: white;
  border: none;
  border-radius: 0 5px 5px 0;
  cursor: pointer;
  font-weight: bold;
}

#addBtn:hover {
  background: #357abd;
}

#taskList {
  list-style: none;
}

.task {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px;
  background: #f9f9f9;
  margin-bottom: 8px;
  border-radius: 5px;
  border-left: 4px solid #4a90e2;
}

.task.completed {
  text-decoration: line-through;
  color: #888;
  border-left-color: #7ed321;
}

.task button {
  background: #e74c3c;
  color: white;
  border: none;
  padding: 5px 10px;
  border-radius: 3px;
  cursor: pointer;
}

.task button:hover {
  background: #c0392b;
}