.ppf-calculator-container {
    max-width: 600px;
    margin: 30px auto;
    padding: 25px;
    background-color: #ffffff;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    font-family: 'Helvetica', Arial, sans-serif;
}

.ppf-calculator-container h2,
.ppf-calculator-container h3 {
    color: #FFA500; /* Orange headings */
    text-align: center;
    margin-bottom: 20px;
    font-size: 24px;
    font-weight: 600;
}

.ppf-input-group {
    margin-bottom: 25px;
}

.ppf-input-group label {
    display: flex;
    align-items: center;
    margin-bottom: 8px;
    font-weight: 500;
    color: #000000; /* Black text for labels */
    font-size: 16px;
}

.ppf-input-group label i {
    margin-right: 10px;
    color: #FFA500; /* Orange icons */
}

.ppf-input-group input[type="number"] {
    width: 100%;
    padding: 10px;
    border: 1px solid #dcdcdc;
    border-radius: 6px;
    font-size: 16px;
    color: #000000; /* Black text for inputs */
    background-color: #f8f8f8;
    box-sizing: border-box;
    transition: border-color 0.3s;
}

.ppf-input-group input[type="number"]:focus {
    border-color: #FFA500;
    outline: none;
}

.ppf-input-group input[type="range"] {
    width: 100%;
    margin-top: 10px;
    accent-color: #FFA500; /* Orange slider */
}

.ppf-result-container {
    margin-top: 25px;
    padding: 20px;
    background-color: #f8f8f8;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.ppf-result-item {
    display: flex;
    justify-content: space-between;
    margin-bottom: 12px;
    font-size: 16px;
    color: #000000; /* Black text for results */
}

.ppf-result-item span {
    font-weight: 500;
    color: #333333;
}

.ppf-result-item strong {
    color: #000000; /* Black text for values */
    font-weight: 600;
}

#ppf-chart {
    margin-top: 25px;
    max-width: 300px;
    margin-left: auto;
    margin-right: auto;
}