/* --- Root Variables for Easy Customization --- */
:root {
    --primary-color: #007bff; /* Main brand color (e.g., buttons, highlights) */
    --background-color: #ffffff; /* Calculator background */
    --form-bg-color: #f8f9fa; /* Input area background */
    --text-color: #333; /* Primary text */
    --label-color: #555; /* Field labels */
    --border-color: #dee2e6; /* Borders and dividers */
    --border-radius: 8px; /* Rounded corners for a modern look */
    --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

/* --- Main Calculator Container --- */
.loan-calculator-container {
    font-family: -apple-system, BlinkMacSystemFont, "Poppins", Segoe UI, Roboto, Arial, sans-serif;
    background-color: var(--background-color);
    padding: 25px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    max-width: 500px;
    margin: 40px auto;
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

/* --- Header --- */
.calculator-header {
    text-align: center;
    margin-bottom: 25px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 20px;
}
.calculator-header h2 {
    margin: 0 0 5px 0;
    color: var(--text-color);
    font-size: 1.5rem;
}
.calculator-header p {
    margin: 0;
    font-size: 0.95rem;
    color: var(--label-color);
}

/* --- Input Form & Groups --- */
.calculator-form {
    display: grid;
    gap: 20px;
}
.input-group {
    display: flex;
    flex-direction: column;
}
.input-group label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--label-color);
    margin-bottom: 8px;
}
.calculator-input {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-size: 1rem;
    background-color: var(--form-bg-color);
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
    box-sizing: border-box; /* Important for padding and border */
}
.calculator-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.2);
}

/* --- Results Section --- */
.calculator-results {
    margin-top: 25px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}
.result-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
}
.result-label {
    font-size: 1rem;
    color: var(--label-color);
}
.result-value {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--primary-color);
}
.result-divider {
    border: 0;
    height: 1px;
    background-color: var(--border-color);
    margin: 5px 0;
}

/* --- Footer --- */
.calculator-footer {
    text-align: center;
    font-size: 0.8rem;
    color: #888;
    margin-top: 20px;
    padding-top: 15px;
    border-top: 1px dashed var(--border-color);
}

/* --- Responsive Design for Mobile --- */
@media (max-width: 600px) {
    .loan-calculator-container {
        padding: 20px;
        margin: 20px;
        box-shadow: none;
        border: 1px solid var(--border-color);
    }
    .calculator-header h2 {
        font-size: 1.3rem;
    }
    .result-value {
        font-size: 1.1rem;
    }
}