*{
    margin:0;
    padding:0;
    box-sizing:border-box;
    font-family:'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body{
    background:#111827;
    min-height:100vh;
    display:flex;
    justify-content:center;
    align-items:center;
    padding:40px 20px;
}

.container{
    width:100%;
    max-width:850px;
    background:#ffffff;
    padding:35px;
    border-radius:18px;
    box-shadow:0 18px 45px rgba(0,0,0,0.25);
}

h1{
    text-align:center;
    color:#1f2937;
    font-size:38px;
    margin-bottom:8px;
}

.subtitle{
    text-align:center;
    color:#6b7280;
    margin-bottom:30px;
    font-size:16px;
}

.input-section{
    display:flex;
    flex-direction:column;
    gap:18px;
}

#task-input,
#task-date,
#task-time{
    width:100%;
    padding:14px;
    font-size:16px;
    border:2px solid #d1d5db;
    border-radius:10px;
    outline:none;
    transition:.3s;
}

#task-input:focus,
#task-date:focus,
#task-time:focus{
    border-color:#4f46e5;
}

.datetime{
    display:flex;
    gap:15px;
}

.datetime input{
    flex:1;
}

#add-btn{
    background:linear-gradient(135deg,#4f46e5,#7c3aed);
    color:#fff;
    border:none;
    padding:15px;
    border-radius:10px;
    font-size:17px;
    cursor:pointer;
    transition:.3s;
}

#add-btn:hover{
    transform:translateY(-2px);
    box-shadow:0 8px 20px rgba(79,70,229,.3);
}

.stats{
    margin:35px 0;
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:20px;
}

.stat-box{
    background:#f3f4f6;
    border-radius:12px;
    padding:20px;
    text-align:center;
}

.stat-box h3{
    font-size:30px;
    color:#4f46e5;
    margin-bottom:8px;
}

.stat-box p{
    color:#4b5563;
    font-weight:600;
}

#task-list{
    display:flex;
    flex-direction:column;
    gap:18px;
}

/* Task Card */

.task{
    background:#f9fafb;
    border-left:6px solid #4f46e5;
    border-radius:12px;
    padding:18px;
    display:flex;
    justify-content:space-between;
    align-items:center;
    gap:20px;
}

.task-info{
    flex:1;
}

.task-info h3{
    color:#111827;
    margin-bottom:8px;
}

.task-info p{
    color:#6b7280;
    font-size:14px;
    margin-top:4px;
}

.task.completed{
    border-left-color:#22c55e;
    background:#ecfdf5;
}

.task.completed h3{
    text-decoration:line-through;
    color:#6b7280;
}

.actions{
    display:flex;
    gap:10px;
    flex-wrap:wrap;
}

.actions button{
    border:none;
    padding:10px 15px;
    border-radius:8px;
    color:#fff;
    cursor:pointer;
    transition:.3s;
    font-size:14px;
}

.complete-btn{
    background:#16a34a;
}

.edit-btn{
    background:#2563eb;
}

.delete-btn{
    background:#dc2626;
}

.actions button:hover{
    opacity:.9;
    transform:scale(1.05);
}

/* Responsive */

@media(max-width:768px){

    .container{
        padding:25px;
    }

    .datetime{
        flex-direction:column;
    }

    .stats{
        grid-template-columns:1fr;
    }

    .task{
        flex-direction:column;
        align-items:flex-start;
    }

    .actions{
        width:100%;
    }

    .actions button{
        flex:1;
    }

}