body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: #f4f6f8;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.container {
    background: white;
    padding: 25px;
    width: 350px;
    border-radius: 10px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

h1 {
    text-align: center;
    margin-bottom: 15px;
}

.input-box {
    display: flex;
    gap: 10px;
}

input {
    flex: 1;
    padding: 8px;
    border-radius: 5px;
    border: 1px solid #ccc;
}

button {
    padding: 8px 15px;
    background: #007bff;
    border: none;
    color: white;
    border-radius: 5px;
    cursor: pointer;
}

button:hover {
    background: #0056b3;
}

ul {
    list-style: none;
    padding: 0;
    margin-top: 15px;
}

li {
    background: #f1f1f1;
    padding: 8px;
    margin-bottom: 8px;
    border-radius: 5px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

li.completed {
    text-decoration: line-through;
    opacity: 0.6;
}

.task-actions button {
    background: red;
    padding: 5px 8px;
    font-size: 12px;
}