body {
    font-family: sans-serif;
    margin: 20px;
    background-color: #f4f4f4;
    color-scheme: light dark;
}
.container {
    max-width: 600px;
    margin: auto;
    background: white;
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
h1 {
    text-align: center;
}
.header-actions {
    display: flex;
    justify-content: space-between;
    margin-bottom: 15px;
}
.delete-btn {
    background-color: #d9534f;
    color: white;
    border: none;
    padding: 8px 12px;
    border-radius: 4px;
    cursor: pointer;
}
#delete-btn:hover {
    background-color: #c9302c;
}
.input-area {
    display: flex;
    margin-bottom: 20px;
}
input[type="text"] {
    flex-grow: 1;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px 0 0 4px;
    font-size: 16px;
}
.add-btn {
    padding: 10px 15px;
    background-color: #5cb85c;
    color: white;
    border: none;
    cursor: pointer;
    border-radius: 0 4px 4px 0;
}
.add-btn:hover {
    background-color: #4cae4c;
}
ul {
    list-style: none;
    padding: 0;
}
ul li {
    background: #f9f9f9;
    padding: 10px;
    border-bottom: 1px solid #eee;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.item-text {
    flex-grow: 1;
    cursor: pointer;
}
.item-text:has(+ input:checked) {
    text-decoration: line-through;
    color: #888;
}
.toggle-btn {
    background-color: #0275d8;
    color: white;
    border: none;
    padding: 5px 10px;
    border-radius: 4px;
    cursor: pointer;
}
.toggle-btn:hover {
    background-color: #025aa5;
}
.d-none {
    display: none;
}

@media (prefers-color-scheme: dark) {
    body {
        background-color: black;
        color: white;
    }
    .container {
        background-color: black;
    }

    ul li {
        background-color: #333;
        border-color: gray;
    }
}