*{
    margin: 0;
    padding: 0;
    font-family: 'poppins', sans-serif;
    box-sizing: border-box;
}
.container{
    width: 100%;
    min-height: 100vh;
    background: linear-gradient(135deg, #153677,#4e085f);
    padding: 10px;
}
.todo-app{
    width: 100%;
    max-width: 540px;
    background: #fff;
    margin: 100px auto 20px;
    padding: 40px 30px 70px;
    border-radius: 10px;
}
.todo-app h2{
    color: #002765;
    display: flex;
    align-items: center;
    margin-bottom: 20px;
}
.todo-app h2 img{
    width: 30px;
    margin-left: 10px;
}
.row{
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #edeef0;
    border-radius: 30px;
    padding-left: 20px;
    margin-bottom: 25px;
}
input {
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    padding: 12px 15px;
    font-size: 18px;
    transition: all 0.3s ease;
    color: #333;
}

input::placeholder {
    font-size: 16px;
    color: #999;
}

input:focus {
    background: #fff;
    box-shadow: 0 0 5px #ff5945;
    border-radius: 20px;
}

button {
    border: none;
    outline: none;
    padding: 16px 50px;
    background: #ff5945;
    color: #fff;
    font-size: 16px;
    cursor: pointer;
    border-radius: 40px;
    transition: all 0.3s ease;
}
button:hover {
    background: #ff836b;
    transform: scale(1.05);
}
ul li {
    list-style: none;
    font-size: 17px;
    padding: 12px 8px 12px 50px;
    user-select: none;
    cursor: pointer;
    position: relative;
    transition: all 0.3s ease;
    animation: slideIn 0.4s ease forwards;
}
ul li:hover {
    background: #f2f2f2;
    transform: translateX(5px);
}
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: 12px;
    left: 8px;
}
ul li.checked{
    color: #555;
    text-decoration: line-through;
}
ul li.checked::before{
    background-image: url(images/checked.png);
}
ul li span {
    position: absolute;
    right: 0;
    top: 5px;
    width: 40px;
    height: 40px;
    font-size: 22px;
    color: #555;
    line-height: 40px;
    text-align: center;
    transition: all 0.3s ease;
    opacity: 0.7;
}
ul li:hover span {
    opacity: 1;
    transform: scale(1.2);
}
ul li span:hover{
    background: #aec4f1;
    border-radius: 50%;

}
@keyframes slideIn {
    0% {
        transform: translateX(-50px);
        opacity: 0;
    }
    100% {
        transform: translateX(0);
        opacity: 1;
    }
}

/* Responsive fix for mobile screens */
@media (max-width: 480px) {
    .row {
        flex-direction: column;
        align-items: center;
        gap: 10px;
    }

    input {
        width: 100%;
        padding: 12px 15px;
        font-size: 18px;
    }

    button {
        width: 100%;
        padding: 14px 0;
        font-size: 18px;
        border-radius: 30px;
    }
}