body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}
header {
    background: #333;
    color: #fff;
    padding: 1rem;
    text-align: center;
}
.dashboard {
    display: flex;
    gap: 20px;
    padding: 20px;
}
section {
    background: #fff;
    padding: 20px;
    border-radius: 8px;
    flex: 1;
}
.task-card {
    padding: 16px;
    border: 1px solid #ddd;
    border-radius: 10px;
    margin-bottom: 12px;
}
.task-card.completed {
    text-decoration: line-through;
}
@media(max-width:768px){
    .dashboard {
        display: block;
    }
    .task-card {
        width: 100%;
    }
}