*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, Helvetica, sans-serif;
}
.container{
    width: 100%;
    min-height: 100vh;
    background: linear-gradient(135deg, #e0eafc, #cfdef3);
    padding: 10px;
}
.to-do{
    background-color: #fff;
    max-width: 545px;
    margin: 100px auto;
    padding: 40px 30px 70px;
    border-radius: 5px;
}
.to-do h2{
    color: #002765;
    display:flex;
    align-items: center;
    margin-bottom:  10px;
}
.to-do h2 img{
    width: 35px;
}
.to-do:hover{
    box-shadow: 1px 2px 2px 3px black;
}
.row{
    display: flex;
    align-items: center;
    justify-content: space-between;
    background-color: #efe2ef;
    border-radius: 10px;
    padding: 20px;
    margin-bottom: 25px;
}
input{
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    padding: 10px;
    font-weight: 14px;
}
button{
    border: none;
    outline: none;
    padding: 16px 50px;
    color: #fff;
    cursor: pointer;
    font-size: 16px;
    background-color: #0a9c10;
    border-radius: 10px;
}
button:hover{
    background-color: #068051;
}
ul li{
    position: relative;
    list-style: none;
    font-size: 17px;
    padding: 12px 8px 12px 50px ;
    user-select: none;
    cursor: pointer;
}
ul li::before{
    content: ' ';
    position: absolute;
    height: 28px;
    width: 28px;
    border-radius: 50%;
    background-image: url(Images/unchecked.png);
    background-size: cover;
    background-position: center;
    top: 8px;
    left: 16px;
}
ul li.check{
color: #555;
text-decoration: line-through;
}
ul li.check::before{
color: #666;
background-image: url(Images/checked.jpg);
}
ul li span{
    position: absolute;
    right: 0;
    top: 5px;
    width: 40px;
    height: 40px;
    font-size: 22px;
    color: #555;
    line-height: 40px;
    text-align: center;
    border-radius: 50%;
}
ul li span:hover{
    background: #f3f3f3;
}
body.dark-mode {
    background: linear-gradient(185deg, #0a0a0a, #222222);
    color: #ffffff;
}

body.dark-mode .to-do {
    background-color: #1f1f1f;
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.1);
}

body.dark-mode input,
body.dark-mode .row {
    background-color: #333;
    color: white;
}

body.dark-mode button {
    background-color: #444;
}

body.dark-mode button:hover {
    background-color: #666;
}

body.dark-mode ul li {
    color: #ccc;
}

body.dark-mode ul li.check {
    color: #888;
    text-decoration: line-through;
}
ul li {
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateY(10px);
    animation: fadeIn 0.4s forwards;
}

@keyframes fadeIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}
body.dark-mode .container {
    background: linear-gradient(135deg, #0d0d0d, #1c1c1c);
}
body.dark-mode .to-do h2 {
    color: #fff;
}
body.dark-mode .to-do h2 img {
    filter: brightness(0) invert(1);
}
body.dark-mode .to-do:hover {
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.2);
}
body.dark-mode .to-do h2 img {
    filter: brightness(0) invert(1);
}