body {
    font-family: Arial, sans-serif;
    background: #0d0d0d;
    color: #fff;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.todo-container {
    background: rgba(0, 0, 0, 0.7);
    padding: 20px;
    border-radius: 15px;
    width: 300px;
    text-align: center;
    box-shadow: 0 0 20px #0ff;
}

h1 {
    color: #0ff;
}

.input-section {
    display: flex;
    margin-bottom: 15px;
}

input {
    flex: 1;
    padding: 10px;
    border: none;
    border-radius: 5px 0 0 5px;
    outline: none;
}

button {
    background: #0ff;
    border: none;
    padding: 10px;
    border-radius: 0 5px 5px 0;
    cursor: pointer;
    font-weight: bold;
}

ul {
    list-style: none;
    padding: 0;
}

li {
    background: rgba(255, 255, 255, 0.1);
    margin: 5px 0;
    padding: 8px;
    border-radius: 5px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.delete-btn {
    background: red;
    color: white;
    border: none;
    padding: 5px;
    border-radius: 3px;
    cursor: pointer;
}