body {
        margin: 0;
        background: linear-gradient(135deg, #667eea, #140f18);
        display: flex;
        justify-content: center;
        align-items: center;
        height: 100vh;
    }

    .container {
        background: white;
        width: 400px;
        padding: 25px;
        border-radius: 15px;
        box-shadow: 0 10px 25px rgba(0,0,0,0.2);
    }

    h2 {
        text-align: center;
        margin-bottom: 20px;
        color: #333;
    }

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

    input {
        flex: 7;
        padding: 10px;
        border-radius: 82px;
        border: 1px solid #ccc;
        outline: none;
        font-size: 14px;
    }

    button {
        padding: 10px 17px;
        border: none;
        border-radius: 8px;
        background: #667eea;
        color: white;
        cursor: pointer;
        transition: 0.3s;
    }

    button:hover {
        background: #5a67d8;
    }

    ul {
        list-style: none;
        padding: 0;
        margin-top: 20px;
        max-height: 300px;
        overflow-y: auto;
    }

    li {
        background: #f4f4f4;
        padding: 10px;
        border-radius: 8px;
        margin-bottom: 10px;
        display: flex;
        justify-content: space-between;
        align-items: center;
        transition: 0.3s;
    }

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

    .actions button {
        margin-left: 5px;
        padding: 5px 8px;
        font-size: 12px;
    }

    .complete-btn {
        background: #38a169;
    }

    .delete-btn {
        background: #e53e3e;
    }