body{
    font-family: 'Segoe UI', sans-serif;
    background: linear-gradient(135deg,#74ebd5,#acb6e5);
    display:flex;
    justify-content:center;
    align-items:center;
    height:100vh;
    margin:0;
}

.container{
    background:white;
    padding:25px;
    border-radius:15px;
    box-shadow:0 8px 25px rgba(0,0,0,0.15);
    width:320px;
    text-align:center;
    transition:0.3s;
}

.container:hover{
    transform:translateY(-5px);
}

h1{
    margin-bottom:20px;
    color:#333;
}

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

input{
    flex:1;
    padding:10px;
    border:1px solid #ddd;
    border-radius:8px;
    outline:none;
    transition:0.2s;
}

input:focus{
    border-color:#6c63ff;
}

button{
    padding:10px 15px;
    border:none;
    background:#6c63ff;
    color:white;
    border-radius:8px;
    cursor:pointer;
    transition:0.2s;
}

button:hover{
    background:#554ee0;
}

ul{
    list-style:none;
    padding:0;
    margin-top:20px;
}

li{
    background:#f7f7f7;
    margin-top:10px;
    padding:10px;
    border-radius:8px;
    display:flex;
    justify-content:space-between;
    align-items:center;
    transition:0.2s;
}

li:hover{
    background:#ececec;
}

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

li button{
    background:#ff5c5c;
    padding:5px 10px;
    font-size:12px;
}

li button:hover{
    background:#e04848;
}