.apc-calculator {
    max-width: 650px;
    margin: 20px auto;
    font-family: Arial, sans-serif;
}

.apc-calculator table {
    width: 100%;
    border-collapse: collapse;
}

.apc-calculator th,
.apc-calculator td {
    border: 1px solid #ddd;
    padding: 12px;
}

.apc-calculator th {
    background: #f3f3f3;
}

.apc-calculator input,
.apc-calculator select {
    width: 100%;
    padding: 8px;
}

.apc-result {
    font-weight: bold;
    text-align: center;
}

.theme-dark table {
    background: #1e1e1e;
    color: #fff;
}

.theme-dark th {
    background: #333;
}