:root {
    --primary-color: rgb(60, 191, 196);
    --light-color: #f8f9fa;
    --dark-color: #343a40;
    --shadow-color: rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--light-color);
    color: var(--dark-color);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
}

.container {
    text-align: center;
}

.calculator h1 {
    color: var(--primary-color);
    margin-bottom: 2rem;
    text-align: center;
}

.calculator {
    background-color: white;
    padding: 2rem;
    border-radius: 1rem;
    box-shadow: 0 10px 25px var(--shadow-color);
    width: 100%;
    max-width: 400px;
}

.input-group {
    margin-bottom: 1.5rem;
    text-align: left;
}

.input-group > label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.input-group input[type="number"] {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ccc;
    border-radius: 0.5rem;
    font-size: 1rem;
}

.radio-group {
    display: flex;
    border-radius: 0.5rem;
    overflow: hidden;
    border: 1px solid #ccc;
}

.radio-group input[type="radio"] {
    display: none; /* Hide the actual radio button */
}

.radio-group label {
    flex: 1;
    text-align: center;
    padding: 0.75rem;
    cursor: pointer;
    background-color: var(--light-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.radio-group label:not(:last-child) {
    border-right: 1px solid #ccc;
}

.radio-group input[type="radio"]:checked + label {
    background-color: var(--primary-color);
    color: white;
    font-weight: 500;
}


button#calculate-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: 0.5rem;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s ease;
    width: 100%;
}

button#calculate-btn:hover {
    background-color: rgb(40, 161, 166);
}

.result {
    margin-top: 2rem;
}

#result-display {
    font-size: 1.5rem;
    font-weight: normal;
    color: var(--dark-color);
}

#tranche-display {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--primary-color);
}