@media (max-width: 900px) {
    .calc-two-cols {
        flex-direction: column;
        gap: 24px;
    }

    .calc-col-left,
    .calc-col-right {
        max-width: 100% !important;
        min-width: 0 !important;
    }
}

.calc-two-cols {
    margin-top: 20px;
}

.calc-two-cols p {
    padding-bottom: 18px;
    font-size: 20px;
    color: #2d2d2d;
}

.radiation-calc {
    padding: 20px;
    background: #fefefe;
    border: 1px solid #ccc;
    border-radius: 6px;
    font-family: Arial, sans-serif;
}

.radiation-calc label {
    color: #777;
    font-size: 12px;
}

.rc-section {
    margin-bottom: 18px;
}

.rc-select,
.rc-input {
    width: 100%;
    padding: 12px 18px;
    font-size: 15px;
    border: 1px solid #bbb;
    border-radius: 4px;
}

.rc-output {
    padding: 6px 0;
    font-weight: bold;
}

.rc-result {
    background: #eef7ea;
    padding: 10px;
    font-size: 16px;
    border-left: 4px solid #4caf50;
}

.rc-note {
    font-size: 13px;
    color: #777;
}

.rc-button {
    background: #3b82f6;
    color: white;
    border: none;
    padding: 10px 18px;
    font-size: 16px;
    border-radius: 4px;
    cursor: pointer;
}

.rc-button:hover {
    background: #2563eb;
}

.calc-wrapper {
    margin-top: 20px;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.calc-wrapper p {
    padding-bottom: 12px;
    font-size: 1.2em;
}

@media (max-width: 768px) {
    .calc-wrapper {
        grid-template-columns: 1fr;
    }
}