body {
    font-family: Arial, sans-serif;
    margin: 20px;
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
}

.category {
    border: 2px solid #444;
    padding: 15px;
    margin-bottom: 20px;
    border-radius: 8px;
}

.assignment {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 8px;
    padding: 10px;
    background: #f5f5f5;
    border-radius: 5px;
    cursor: grab;
}

.assignment.dragging {
    opacity: 0.3;
}

.placeholder {
    height: 40px;
    background: #d0e6ff;
    border: 2px dashed #4a90e2;
    margin-bottom: 8px;
    border-radius: 5px;
}

input[type="number"], input[type="text"] {
    padding: 8px;
    width: 150px;
    flex: 1 1 120px;
}

button {
    padding: 8px 14px;
    cursor: pointer;
    border-radius: 6px;
    border: none;
    background: #4a90e2;
    color: white;
    font-weight: bold;
}

button:hover {
    background: #357ac8;
}

.category-grade {
    font-weight: bold;
    margin-top: 10px;
}

/* MOBILE */
@media (max-width: 600px) {
    body {
        margin: 10px;
    }

    .assignment {
        flex-direction: column;
    }

    input[type="number"], input[type="text"] {
        width: 100%;
    }

    button {
        width: 100%;
    }
}