.pipe-sizing-calculator {
    max-width: 600px;
    margin: 20px auto;
    padding: 20px;
    background: #f9f9f9;
    border-radius: 8px;
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
}

.form-group select, .form-group input {
    width: 100%;
    padding: 8px;
    margin-bottom: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

button[type="submit"], #reset-button {
    background: #0073aa;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    margin-right: 10px;
}

#pipesize-results {
    margin-top: 20px;
    padding: 15px;
    background: white;
    border-radius: 4px;
}

.result-item {
    margin: 10px 0;
}

.error {
    color: #dc3232;
}

.loading {
    color: #0073aa;
}