public static class Fibonacci
{
    public static (int closest, int next) GetClosestFibonacciNumbers(double number)
    {
        if (number < 0)
        {
            return (0, 1);
        }

        int previous = 0;
        int current = 1;

        while (true)
        {
            int nextFibonacci = previous + current;

            if (nextFibonacci > number)
            {
                return (current, nextFibonacci);
            }

            previous = current;
            current = nextFibonacci;
        }
    }
}
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