body{
   margin: 0;
   padding: 0;
   font-family: 'Segoe UI', sans-serif;
   background: linear-gradient(135deg, #667eea, #764ba2);
   min-height: 100vh;
   display: flex;
   justify-content: center;
   align-items: center;
}

.container{
    background: white;
    width: 420px;
    padding: 30px;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
}

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

input{
    padding: 10px;
    width: 65%;
    border: 1px solid #ccc;
    border-radius: 8px;
    outline: none;
}

#addBtn{
    padding: 10px 15px;
    background: #4CAF50;
    border: none;
    color: white;
    border-radius: 8px;
    cursor: pointer;
    transition: 0.3s;
} 

#addBtn:hover{
   background: #43a047;
}

.completed{
    background: #bab9b9;
    text-decoration: line-through;
    opacity: 0.7;
}

 ul{
    list-style-type: none;
    padding: 0;
    margin: 0;
} 

li{
list-style: none;
background: #eef2ff;
margin-top: 10px;
padding: 12px 15px;
border-radius: 8px;
display: flex;
justify-content: space-between;
align-items: center;
transition: 0.2s ease;
}
 
li:hover{
    background: #eeeeee;
    transform: scale(1.02);
}

li button{
    background-color: #ff4d4d;
    border: none;
    color: white;
    padding: 5px 8px;
    border-radius: 5px;
    cursor: pointer;
    transition: 0.2s ease;
}

/* li button:hover{
    background-color: #cc0000;
} */

 #completedList li{
    background: #f0f0f0;
    color: #888;
    text-decoration: line-through;
} 

 #completedList li button{
    background-color: #6c757d;
} 

 #completedList li button:hover{
    background-color: #777;
} 

button{
    background: #ff6b6b;
    border: none;
    color: white;
    padding: 6px 12px;
    border-radius: 6px;
    cursor: pointer;
    transition: 0.2s ease;
}

button:hover{
    opacity: 0.85;
}