/* Neon Rampage — small shared utilities. */
(function () {
  'use strict';
  var US = (window.US = window.US || {});
  US.util = {
    rand: function (a, b) { return a + Math.random() * (b - a); },
    randInt: function (a, b) { return Math.floor(a + Math.random() * (b - a + 1)); },
    pick: function (arr) { return arr[Math.floor(Math.random() * arr.length)]; },
    clamp: function (v, a, b) { return v < a ? a : v > b ? b : v; },
    dist2: function (ax, ay, bx, by) { var dx = ax - bx, dy = ay - by; return dx * dx + dy * dy; },
    fmt: function (n) { return String(Math.floor(n)).replace(/\B(?=(\d{3})+(?!\d))/g, ','); }
  };
})();