body {
    font-family: 'Orbitron', sans-serif;
    background: radial-gradient(circle at center, #000010 0%, #050018 60%, #000000 100%);
    color: #ccffcc;
    text-align: center;
    padding: 20px;
}


h1 {
    font-size: 2.2rem;
    color: #39ff14;
    text-shadow: 0 0 10px #39ff14, 0 0 20px #39ff14;
    margin-bottom: 30px;
}


.todo-list {
    list-style-type: none;
    padding: 0;
    max-width: 600px;
    margin: 0 auto;
    border: 2px solid #39ff14;
    border-radius: 15px;
    background-color: rgba(20, 20, 40, 0.8);
    box-shadow: 0 0 20px #39ff14;
}


.todo-list > li {
    padding: 15px;
    border-bottom: 1px solid rgba(57, 255, 20, 0.3);
    text-align: left;
}

.todo-list > li:last-child {
    border-bottom: none;
}


input[type="checkbox"] {
    transform: scale(1.5);
    accent-color: #39ff14;
    margin-right: 10px;
}


label {
    cursor: pointer;
    font-size: 1.1rem;
    color: #ccffcc;
}


.sub-item {
    list-style-type: square;
    margin-left: 40px;
    margin-top: 8px;
}


.sub-item-link {
    text-decoration: none; 
    color: #00e5ff; 
    font-weight: bold;
    transition: color 0.3s ease, text-shadow 0.3s ease;
}


.sub-item-link:visited {
    color: #b300ff; 
}


.sub-item-link:hover {
    color: #39ff14; 
    text-shadow: 0 0 5px #39ff14, 0 0 10px #39ff14;
}


.sub-item-link:active {
    color: #ff3131; 
}


.sub-item-link:focus {
    outline: 2px solid #ff00ff; 
    outline-offset: 2px;
}