body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  padding: 0;
  background: #f4f7fa;
  color: #333;
}

.app {
  padding: 2rem;
}

header {
  text-align: center;
  margin-bottom: 2rem;
}

header h1 {
  font-size: 2.5rem;
  color: #2c3e50;
}

header p {
  font-size: 1.1rem;
  color: #555;
}

.taskboard {
  display: flex;
  justify-content: space-between;
  gap: 1.5rem;
}

.column {
  flex: 1;
  background: #fff;
  border-radius: 8px;
  padding: 1rem;
  box-shadow: 0 4px 10px rgba(0,0,0,0.05);
  display: flex;
  flex-direction: column;
  min-height: 400px;
}

.column h2 {
  text-align: center;
  color: #34495e;
}

.task-list {
  flex-grow: 1;
  margin-top: 1rem;
  padding: 0.5rem;
  border: 1px dashed #ccc;
  min-height: 100px;
}

.task {
  background: #ecf0f1;
  margin-bottom: 0.5rem;
  padding: 0.75rem;
  border-radius: 4px;
  cursor: move;
}

button {
  margin-top: 1rem;
  padding: 0.5rem 1rem;
  font-size: 1rem;
  background-color: #3498db;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

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