/* RESET & FONT */
*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

/* CONTAINER */
.container{
    width: 100%;
    min-height: 100vh;
    background: linear-gradient(135deg, #1e1e2f, #3b3b4d);
    display: flex;
    justify-content: center;
    align-items: flex-start; /* keep top margin for desktop */
    padding: 20px 10px;
}

/* TODO APP BOX */
.todo-app{
    width: 100%;
    max-width: 500px;
    background: #2c2c3d;
    padding: 30px 25px 50px;
    border-radius: 15px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.5);
    transition: all 0.3s ease;
    margin-top: 80px; /* Desktop top margin */
}

/* HEADING */
.todo-app h2{
    color: #fff;
    display: flex;
    align-items: center;
    margin-bottom: 25px;
    font-size: 1.8rem;
}
.todo-app h2 img{
    width: 32px;
    margin-left: 10px;
}

/* INPUT ROW */
.row{
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: #3a3a50;
    border-radius: 50px;
    padding: 10px 15px;
    margin-bottom: 25px;
}
.row input{
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    color: #fff;
    font-size: 16px;
    padding: 8px 12px;
}
.row input::placeholder{
    color: #bbb;
}
.row button{
    border: none;
    outline: none;
    padding: 12px 30px;
    background: #ff6b6b;
    color: #fff;
    font-size: 16px;
    cursor: pointer;
    border-radius: 50px;
    transition: background 0.3s ease;
}
.row button:hover{
    background: #ff4c4c;
}

/* TASK LIST */
ul li{
    list-style: none;
    font-size: 16px;
    padding: 12px 10px 12px 50px;
    user-select: none;
    cursor: pointer;
    position: relative;
    border-bottom: 1px solid #444;
    color: #eee;
    transition: all 0.2s ease;
}
ul li:hover{
    background: #3a3a50;
}
ul li::before{
    content: ' ';
    position: absolute;
    height: 24px;
    width: 24px;
    border-radius: 50%;
    background-image: url(images/unchecked.png);
    background-size: cover;
    background-position: center;
    top: 50%;
    transform: translateY(-50%);
    left: 10px;
}
ul li.checked{
    color: #999;
    text-decoration: line-through;
}
ul li.checked::before{
    background-image: url(images/checked.png);
}
ul li span{
    position: absolute;
    right: 10px;
    top: 50%;
    transform: translateY(-50%);
    width: 32px;
    height: 32px;
    font-size: 20px;
    color: #ff6b6b;
    line-height: 32px;
    text-align: center;
    border-radius: 50%;
    transition: all 0.2s ease;
}
ul li span:hover{
    background: #3a3a50;
}

/* RESPONSIVE */
@media (max-width: 480px){
    .todo-app{
        margin: 50px auto 0; /* Top margin 50px, horizontal center */
        padding: 25px 20px 40px;
    }
    .row{
        flex-direction: column;
        gap: 10px;
        border-radius: 20px;
    }
    .row button{
        width: 100%;
        padding: 10px 0;
        font-size: 14px;
        border-radius: 15px;
    }
    ul li{
        font-size: 14px;
        padding-left: 45px;
    }
}