body {
    font-family: 'Inter', sans-serif;
    background-color: white;
    color: black;
    margin: 0;
    padding: 20px;
}

.main-container {
    max-width: 720px;
    margin: 0 auto;
}

.formula {
    font-size: 24px;
    text-align: center;
    font-weight: 600;
    margin-bottom: 20px;
    word-wrap: break-word;
    background-color: #F5F5F5;
    padding: 15px;
    border-radius: 8px;
    border: 1px solid #ccc;
}

.container {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.calculators {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    width: 100%;
    margin-bottom: 30px;
}

.calculator {
    background-color: #F5F5F5;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 15px;
    box-sizing: border-box;
    border-radius: 10px;
    cursor: pointer;
    position: relative;
    transition: border 0.2s ease;
}

.calculator.selected::after {
    content: '';
    position: absolute;
    top: -3px;
    right: -3px;
    bottom: -3px;
    left: -3px;
    border: 3px solid #000AFF;
    border-radius: 10px;
    pointer-events: none;
}

.calculator h2 {
    font-size: 18px;
    margin: 5px 0;
    text-align: center;
}

.calculator .inputs {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 5px;
    margin-top: 10px;
}

.calculator label {
    font-size: 14px;
    margin-right: 5px;
}

.calculator input[type="number"],
.calculator input[type="text"] {
    width: 80px;
    padding: 8px;
    border: 1px solid #CCC;
    border-radius: 5px;
    font-size: 16px;
    text-align: center;
    outline: none;
    background-color: white;
    color: black;
    -moz-appearance: textfield;
}

.calculator input[type="number"][readonly],
.calculator input[type="text"][readonly] {
    font-weight: bold;
    color: #000AFF;
    cursor: pointer;
    transition: background-color 0.2s ease;
}

.calculator input[type="number"][readonly]:hover,
.calculator input[type="text"][readonly]:hover {
    background-color: #000AFF;
    color: white;
}

.calculator input[type="number"]::-webkit-outer-spin-button,
.calculator input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.calculator span {
    margin: 5px;
    font-size: 16px;
}

.result-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2px;
}

.percent-symbol {
    font-size: 16px;
    font-weight: bold;
    color: #000AFF;
}

.sign-symbol {
    font-size: 20px;
    font-weight: bold;
    color: black;
    margin-right: 5px;
}

.chart-container {
    width: 100%;
    max-width: 600px;
    height: 400px;
    position: relative;
    background-color: #F5F5F5;
    border-radius: 10px;
    padding: 20px;
    box-sizing: border-box;
}

#dynamicChart {
    width: 100%;
    height: 100%;
}

.copy-popup {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background-color: #000AFF;
    color: white;
    padding: 10px 20px;
    border-radius: 5px;
    font-size: 16px;
    opacity: 0;
    transition: opacity 0.3s ease-in-out;
    pointer-events: none;
    z-index: 1000;
}

.copy-popup.show {
    opacity: 1;
}

/* Responsive Styles */
@media (max-width: 768px) {
    .calculators {
        grid-template-columns: 1fr;
    }

    .chart-container {
        height: 300px;
    }
}