/* Import from Google Fonts, will be loaded by the browser */
@import url('https://fonts.googleapis.com/css2?family=Roboto:wght@400;500;700&display=swap');

.calculator-container {
    font-family: 'Roboto', sans-serif;
    background: #ffffff;
    border-radius: 12px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
    padding: 2rem;
    width: 100%;
    max-width: 900px;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin: 2em auto; /* Center it on the page */
}

.calculator-container h1 {
    text-align: center;
    margin: 0 0 1rem 0;
    color: #007bff;
    transition: opacity 0.3s ease-in-out;
}

/* --- Controls Section (Toggles & Radios) --- */
.calculator-container .controls {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid #dee2e6;
}

.calculator-container .control-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.calculator-container .control-group label.group-label {
    font-weight: 500;
    color: #6c757d;
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
}

.calculator-container .item-type-selector {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.calculator-container .item-type-selector input[type="radio"] {
    margin-right: 5px;
}

/* --- Toggle Switch Styling --- */
.calculator-container .toggle-switch {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
}

.calculator-container .switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 26px;
}

.calculator-container .switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.calculator-container .slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
    border-radius: 26px;
}

.calculator-container .slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

.calculator-container input:checked + .slider {
    background-color: #007bff;
}

.calculator-container input:focus + .slider {
    box-shadow: 0 0 1px #007bff;
}

.calculator-container input:checked + .slider:before {
    transform: translateX(24px);
}

.calculator-container .toggle-label.active {
    font-weight: bold;
    color: #007bff;
}


/* --- Main Content (Panels) --- */
.calculator-container .main-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.calculator-container .panel {
    padding: 1.5rem;
    border: 1px solid #dee2e6;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.calculator-container .panel h2 {
    margin: 0;
    font-size: 1.25rem;
    color: #007bff;
    text-align: center;
    min-height: 1.5rem; /* Prevents layout shift when title changes */
}

/* --- Input & Output Fields --- */
.calculator-container .input-group {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.calculator-container .input-row, .calculator-container .output-row {
    display: flex;
    align-items: center;
    gap: 10px;
}

.calculator-container .input-row label, .calculator-container .output-row label {
    font-weight: 500;
    width: 60px;
}

.calculator-container .input-fields {
    display: flex;
    gap: 5px;
    align-items: center;
    flex-grow: 1;
}

.calculator-container input[type="number"] {
    width: 110px;
    padding: 10px;
    border: 1px solid #dee2e6;
    border-radius: 5px;
    font-size: 1rem;
    text-align: center;
    color: #333;
    background-color: #ffffff;
}

.calculator-container input[type="number"]:focus {
    outline: none;
    border-color: #007bff;
    box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.25);
}

.calculator-container .input-fields span {
    color: #6c757d;
}

.calculator-container #mm-inputs input[type="number"] {
    width: 100%;
}

.calculator-container .output-value {
    flex-grow: 1;
    padding: 10px 15px;
    background-color: #f8f9fa;
    border: 1px solid #dee2e6;
    border-radius: 5px;
    font-weight: bold;
    font-size: 1.1rem;
    min-height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.calculator-container .copy-btn {
    background-color: #6c757d;
    color: white;
    border: none;
    border-radius: 5px;
    padding: 8px 12px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: background-color 0.2s;
}

.calculator-container .copy-btn:hover {
    background-color: #5a6268;
}

.calculator-container .copy-btn.copied {
    background-color: #28a745;
}

/* --- Responsive Design --- */
@media (max-width: 768px) {
    .calculator-container {
        padding: 1rem;
    }
    .calculator-container .main-content {
        grid-template-columns: 1fr;
    }
    .calculator-container .controls {
         grid-template-columns: 1fr;
    }
}