/* --- Main Calculator Wrapper --- */
.mpwc-calculator-wrapper {
    background-color: #f9f9f9;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    padding: 25px;
    /*max-width: 700px;*/
    margin: 20px auto;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: #333;
}

.mpwc-form-container h3 {
    margin-top: 0;
    margin-bottom: 20px;
    color: #1a237e;
    text-align: center;
    font-size: 22px;
}

/* --- Input Grid --- */
.mpwc-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px 20px;
}

/* --- Input Groups & Fields --- */
.mpwc-input-group {
    display: flex;
    flex-direction: column;
}

.mpwc-input-group label {
    font-weight: 600;
    margin-bottom: 6px;
    font-size: 14px;
}

.mpwc-input-group select,
.mpwc-input-group input[type="number"] {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
    font-size: 16px;
    box-sizing: border-box;
    transition: border-color 0.2s;
}

.mpwc-input-group select:focus,
.mpwc-input-group input[type="number"]:focus {
    outline: none;
    border-color: #1a237e;
}

.mpwc-input-group select {
    margin-bottom: 20px;
}

.mpwc-input-with-unit {
    position: relative;
    display: flex;
    align-items: center;
}

.mpwc-input-with-unit .mpwc-unit {
    position: absolute;
    right: 10px;
    color: #777;
    font-size: 14px;
    pointer-events: none;
    padding-right: 20px;
}

/* --- Unit Switcher --- */
.mpwc-unit-switcher {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 20px;
}

.mpwc-unit-switcher label {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-weight: 500;
}

.mpwc-unit-switcher input[type="radio"] {
    margin-right: 15px;
    scale: 200%;
}

/* --- Results Section --- */
.mpwc-results-container {
    background-color: #e8eaf6;
    border-radius: 8px;
    padding: 20px;
    margin-top: 25px;
    border-left: 5px solid #1a237e;
}

.mpwc-results-container h4 {
    margin-top: 0;
    margin-bottom: 15px;
    color: #1a237e;
}

.mpwc-result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 16px;
    padding: 10px 0;
}

.mpwc-result-item + .mpwc-result-item {
    border-top: 1px solid #c5cae9;
}

.mpwc-result-value {
    font-weight: 700;
    font-size: 18px;
    color: #333;
}

.mpwc-total-weight .mpwc-result-value {
    font-size: 22px;
    color: #1a237e;
}

/* --- Error Message --- */
.mpwc-error {
    background-color: #ffebee;
    color: #c62828;
    padding: 10px;
    border-radius: 4px;
    margin-bottom: 15px;
    text-align: center;
}

/* --- Density Table --- */
.mpwc-density-table-wrapper {
    margin: 40px auto;
    max-width: 700px;
}

.mpwc-density-table-wrapper h4 {
    text-align: center;
    color: #333;
    font-size: 18px;
}

.mpwc-density-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
}

.mpwc-density-table th,
.mpwc-density-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid #e0e0e0;
}

.mpwc-density-table th {
    background-color: #f5f5f5;
    font-weight: 600;
}

.mpwc-density-table tbody tr:nth-child(even) {
    background-color: #fafafa;
}

/* --- Responsive Design --- */
@media (max-width: 600px) {
    .mpwc-grid {
        grid-template-columns: 1fr;
    }
}