.rt-calc-wrapper {
    max-width: 600px;
    margin: 20px auto;
    font-family: Arial, sans-serif;
    background-color: #ffffff;
    border: 2px solid #e0e0e0;
    border-radius: 8px;
    padding: 25px;
    box-sizing: border-box;
    color: #333333;
}
.rt-calc-header h2 {
    color: #2e7d32;
    margin-top: 0;
    margin-bottom: 5px;
    font-size: 24px;
    border-bottom: 2px solid #e0e0e0;
    padding-bottom: 10px;
}
.rt-calc-header p {
    color: #666666;
    font-size: 15px;
}
.rt-calc-inputs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-top: 20px;
}
.rt-input-row label {
    display: block;
    font-weight: bold;
    font-size: 14px;
    margin-bottom: 5px;
    color: #555555;
}
.rt-input-row input {
    width: 100%;
    padding: 10px;
    border: 1px solid #cccccc;
    border-radius: 4px;
    box-sizing: border-box;
    font-size: 15px;
    background-color: #f9f9f9;
}
.rt-input-row input:focus {
    border-color: #4CAF50;
    outline: none;
    background-color: #ffffff;
}
.rt-calc-actions {
    margin-top: 20px;
    text-align: center;
}
.rt-btn {
    padding: 12px 25px;
    font-size: 16px;
    font-weight: bold;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: 0.3s;
}
.rt-btn-green {
    background-color: #4CAF50;
    color: white;
}
.rt-btn-green:hover {
    background-color: #388e3c;
}
.rt-btn-grey {
    background-color: #e0e0e0;
    color: #333333;
    margin-left: 10px;
}
.rt-btn-grey:hover {
    background-color: #bdbdbd;
}
.rt-error-msg {
    color: #d32f2f;
    text-align: center;
    font-weight: bold;
    margin-top: 15px;
}
.rt-result-section {
    margin-top: 25px;
    border-top: 2px dashed #cccccc;
    padding-top: 20px;
}
.rt-answer-box {
    background-color: #f1f8e9;
    border: 1px solid #aed581;
    border-radius: 6px;
    padding: 15px;
    margin-bottom: 15px;
}
.rt-answer-box h3 {
    color: #2e7d32;
    margin-top: 0;
    margin-bottom: 15px;
    font-size: 18px;
}
.rt-answer-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 15px;
}
.rt-answer-grid div {
    font-size: 14px;
    color: #555555;
    font-weight: bold;
}
.rt-answer-grid span {
    font-size: 18px;
    color: #2e7d32;
    display: block;
    margin-top: 5px;
}
.rt-formula-box {
    background-color: #f5f5f5;
    border: 1px solid #cccccc;
    border-radius: 6px;
    padding: 15px;
}
.rt-formula-box h3 {
    color: #424242;
    margin-top: 0;
    margin-bottom: 10px;
    font-size: 18px;
}
.rt-formula-list p {
    margin: 5px 0;
    font-family: monospace;
    font-size: 15px;
    color: #333333;
    font-weight: bold;
}
.rt-diagram-box {
    margin-top: 25px;
    text-align: center;
    padding: 20px;
    background-color: #fafafa;
    border: 1px solid #eeeeee;
    border-radius: 6px;
}
@media (max-width: 500px) {
    .rt-calc-inputs, .rt-answer-grid {
        grid-template-columns: 1fr;
    }
}