.rq-container {
    max-width: 800px;
    margin: 20px auto;
    text-align: center;
    font-family: Arial, sans-serif;
}

.rq-description {
    font-size: 1.1rem;
    margin-bottom: 15px;
}

.rq-btn {
    background-color: #003399;
    color: white;
    border: none;
    padding: 8px 18px;
    font-size: 1rem;
    border-radius: 6px;
    margin: 8px;
    cursor: pointer;
}

    .rq-btn:hover {
        background-color: #002060;
    }

.rq-success {
    background-color: #0a8a0a;
}

    .rq-success:hover {
        background-color: #066b06;
    }

.rq-grid {
    margin: 20px auto;
    border-collapse: collapse;
    border: 8px solid #00008B;
}

    .rq-grid td {
        width: 55px;
        height: 55px;
        border: 1px solid #ccc;
        font-size: 22px;
        text-align: center;
        vertical-align: middle;
        font-family: monospace;
    }

.operant {
    background-color: #fff;
}

.operator {
    background-color: #ddd;
}

.result {
    background-color: #cfc;
    font-weight: bold;
}

.result-operator {
    background-color: #a5c9a5;
}

.final {
    background-color: #6fdd6f;
    font-weight: bold;
}

.empty-cell {
    background-color: #001a66;
}

.hidden-cell input {
    width: 100%;
    height: 100%;
    text-align: center;
    border: 2px solid #ffe999;
    font-size: 22px;
    outline: none;
    font-family: monospace;
    background-color: #fffacd;
}

.error-highlight {
    background-color: #ff3333 !important;
    color: white;
}

.rq-controls {
    margin-top: 15px;
}

.rq-timer {
    font-weight: bold;
    margin-top: 8px;
}

.hidden {
    display: none !important;
}
.scoreBox {
    margin-top: 20px;
}

.scoreTable {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
}

    .scoreTable th, .scoreTable td {
        padding: 4px 6px;
        border-bottom: 1px solid #ccc;
        text-align: left;
    }

    .scoreTable th {
        background-color: #eef5ff;
    }
#scoreList {
    margin: 10px 0 20px 0;
    font-size: 1.1em;
}