body {
    font-family: Arial;
}

.group-table {
    width: 80%;
    margin: 20px auto;
    border-collapse: collapse;
    text-align: center;
}

.group-table td {
    border: 1px solid #000;
    padding: 6px;
    font-weight: bold;
    background: #f5f5f5;
}

.group-table tr:first-child td {
    background: #ddd;
}

table {
    border-collapse: collapse;
    overflow-x: auto;
}

td, th {
    border: 1px solid #000;
    padding: 6px;
    text-align: center;
    text-transform: uppercase;
}

tfoot tr {
    background: #ffeeba;   /* light yellow */
    font-weight: bold;
}

tfoot td {
    border-top: 3px solid #000;
}

input {
    width: 60px;
}

button {
    padding: 3px 6px;
    cursor: pointer;
}
.layout {
    display: flex;
}

.table-area {
    width: 75%;
    overflow-x: auto;
}

.result-area {
    width: 25%;
    padding: 10px;
    border-left: 2px solid #000;
}

button.green {
    background: green;
    color: #fff;
}

button.red {
    background: red;
    color: #fff;
}

.main-btn {
    margin-bottom: 10px;
    padding: 10px;
}

/* 🔥 DOWN COLUMN HIGHLIGHT */
.down-active {
    background-color: #fff3cd !important; /* light yellow */
}