/* General Styles */
body {
    font-family: sans-serif;
    background-color: #f4f4f4;
    margin: 0;
    padding: 20px; /* Add padding */
}

.app-container {
    max-width: 600px;
    margin: 20px auto;
    background-color: #fff;
    padding: 20px 30px 30px 30px;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

header {
    text-align: center;
    margin-bottom: 25px;
    border-bottom: 1px solid #eee;
    padding-bottom: 15px;
}

h1 {
    color: #333;
    margin: 0 0 15px 0; /* Adjust margin */
}

/* Navigation Tabs/Buttons */
nav#calculator-nav {
    display: flex;
    justify-content: center;
    gap: 10px; /* Space between buttons */
    flex-wrap: wrap; /* Allow buttons to wrap on smaller screens */
}

nav#calculator-nav button {
    background-color: #e9ecef;
    color: #0056b3;
    border: 1px solid #dee2e6;
    padding: 8px 15px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.95em;
    transition: background-color 0.2s ease, color 0.2s ease;
}

nav#calculator-nav button:hover {
    background-color: #d4dadf;
}

nav#calculator-nav button.active {
    background-color: #007bff;
    color: white;
    border-color: #007bff;
    font-weight: bold;
}

/* Calculator Sections */
.calculator-section {
    display: none; /* Hide sections by default */
    margin-top: 20px;
    padding-top: 15px;
    border-top: 1px dashed #ccc; /* Separator */
}

.calculator-section.active {
    display: block; /* Show the active section */
}

.calculator-section h2 {
    color: #444;
    margin-top: 0;
    margin-bottom: 15px;
    text-align: center;
}

.calculator-section p {
    color: #555;
    font-size: 0.9em;
    margin-bottom: 20px;
    text-align: center;
}

/* Input Groups (Common Styling) */
.input-group {
    margin-bottom: 20px;
    text-align: left;
}

.input-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
    color: #444;
}

.input-group input[type="number"],
.input-group input[type="text"] /* Add other types if needed */ {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    box-sizing: border-box;
    font-size: 1em;
}
.input-group input[readonly] {
    background-color: #e9ecef; /* Style for read-only outputs */
    cursor: not-allowed;
}


/* Hide spinner arrows on number inputs */
input[type=number]::-webkit-inner-spin-button,
input[type=number]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
input[type=number] {
  -moz-appearance: textfield; /* Firefox */
}

/* Buttons (Common Styling) */
.calculator-section button.clearBtn { /* More specific selector */
    background-color: #6c757d; /* Grey */
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9em;
    transition: background-color 0.2s ease;
    display: block; /* Make button block */
    margin: 10px auto 0 auto; /* Center button */
}

.calculator-section button.clearBtn:hover {
    background-color: #5a6268;
}

/* Status Messages (Common Styling) */
.calculator-section .status {
    margin-top: 15px;
    font-weight: bold;
    min-height: 1.2em; /* Reserve space */
    color: #d9534f; /* Error color */
    text-align: center;
    font-size: 0.9em;
}

.input-group input[readonly] {
    background-color: #e9ecef; /* Light grey background */
    cursor: not-allowed;      /* Indicate non-editable */
    /* Optionally add a subtle border or remove focus outline */
    /* border-color: #ced4da; */
    /* outline: none; */
}