* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Segoe UI', sans-serif;
}

body {
  background: #f0f2f5;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.container {
  background: #fff;
  padding: 2rem;
  border-radius: 12px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  width: 90%;
  max-width: 400px;
}

h1 {
  text-align: center;
  margin-bottom: 1rem;
}

.input-section {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

#taskInput {
  flex: 1;
  padding: 0.5rem;
  border: 1px solid #ccc;
  border-radius: 6px;
}

#addBtn {
  padding: 0.5rem 1rem;
  background: #28a745;
  color: #fff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

#addBtn:hover {
  background: #218838;
}

#taskList li {
  list-style: none;
  background: #f8f9fa;
  padding: 0.6rem;
  border-radius: 6px;
  margin-bottom: 0.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

#taskList li.completed {
  text-decoration: line-through;
  color: #888;
}

button.deleteBtn {
  background: #dc3545;
  border: none;
  color: white;
  padding: 0.3rem 0.6rem;
  border-radius: 6px;
  cursor: pointer;
}

button.deleteBtn:hover {
  background: #c82333;
}