/* Material Calculators */

* {
    box-sizing: border-box;
}

body {
    font-family: system-ui, -apple-system, sans-serif;
    line-height: 1.4;
    color: #333;
    background: #f5f5f5;
    margin: 0;
    padding: 1rem;
}

.calculator-container {
    max-width: 500px;
    margin: 0 auto;
    background: white;
    border: 1px solid #ddd;
}

.calculator-header {
    background: #2c3e50;
    color: white;
    padding: 1.5rem;
}

.calculator-header h1 {
    margin: 0 0 0.5rem 0;
    font-size: 1.5rem;
}

.calculator-header p {
    margin: 0;
    font-size: 0.9rem;
    opacity: 0.9;
}

.calculator-form {
    padding: 1.5rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1rem;
}

@media (max-width: 480px) {
    .form-row {
        grid-template-columns: 1fr;
    }
}

label {
    display: block;
    margin-bottom: 0.25rem;
    font-weight: 500;
}

label .unit {
    font-weight: 400;
    color: #666;
    font-size: 0.85rem;
}

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

input[type="number"]:focus {
    outline: none;
    border-color: #2c3e50;
}

.radio-group {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.radio-option {
    display: flex;
    align-items: center;
}

.checkbox-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.checkbox-option {
    display: flex;
    align-items: center;
}

select {
    width: 100%;
    padding: 0.5rem;
    border: 1px solid #ccc;
    font-size: 1rem;
    background: white;
}

select:focus {
    outline: none;
    border-color: #2c3e50;
}

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

input[type="text"]:focus {
    outline: none;
    border-color: #2c3e50;
}

input[type="checkbox"] {
    margin-right: 0.5rem;
}

fieldset {
    border: 1px solid #ddd;
    padding: 1rem;
    margin: 0;
}

legend {
    font-weight: 500;
    padding: 0 0.5rem;
}

.btn {
    padding: 0.5rem 1.5rem;
    border: none;
    border-radius: 3px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
}

.btn-primary {
    background: #3498db;
    color: white;
}

.btn-primary:hover {
    background: #2980b9;
}

.result-section {
    background: #f8f9fa;
    padding: 1.5rem;
    text-align: center;
    border-top: 1px solid #ddd;
}

.result-value {
    font-size: 2rem;
    font-weight: 700;
    color: #2c3e50;
    margin: 0 0 0.25rem 0;
}

.result-label {
    color: #666;
    margin: 0;
}

.back-link {
    padding: 1rem;
    text-align: center;
    background: white;
    border-top: 1px solid #ddd;
}

.back-link a {
    color: #2c3e50;
    text-decoration: none;
}

.back-link a:hover {
    text-decoration: underline;
}