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

body {
  height: 100vh;
  background: linear-gradient(135deg, #667eea, #764ba2);
  display: flex;
  justify-content: center;
  align-items: center;
}

.container {
  background: white;
  width: 400px;
  padding: 30px;
  border-radius: 20px;
  box-shadow: 0 20px 40px rgba(0,0,0,0.2);
}

h1 {
  text-align: center;
  margin-bottom: 20px;
  color: #333;
}

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

#taskInput {
  flex: 1;
  padding: 10px;
  border-radius: 10px;
  border: 1px solid #ddd;
  outline: none;
  font-size: 14px;
}

#taskInput:focus {
  border-color: #667eea;
}

#addBtn {
  padding: 10px 15px;
  border: none;
  background: #667eea;
  color: white;
  border-radius: 10px;
  cursor: pointer;
  transition: 0.3s;
}

#addBtn:hover {
  background: #5a67d8;
}

ul {
  list-style: none;
}

li {
  background: #f5f5f5;
  padding: 10px 12px;
  border-radius: 10px;
  margin-bottom: 10px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: 0.3s;
}

li:hover {
  background: #eaeaea;
}

li.completed span {
  text-decoration: line-through;
  color: gray;
}

.task-text {
  cursor: pointer;
}

.delete-btn {
  background: crimson;
  color: white;
  border: none;
  padding: 6px 10px;
  border-radius: 8px;
  cursor: pointer;
  transition: 0.3s;
}

.delete-btn:hover {
  background: darkred;
}