// smoothscroll v0.9.9
// licensed under the terms of the mit license.
// people involved
// - balazs galambosi: maintainer (changelog.txt)
// - patrick brunner (patrickb1991@gmail.com)
// - michael herf: ssc_pulse algorithm

function ssc_init() {
  if (!document.body) return;
  var e = document.body;
  var t = document.documentelement;
  var n = window.innerheight;
  var r = e.scrollheight;
  ssc_root = document.compatmode.indexof("css") >= 0 ? t : e;
  ssc_activeelement = e;
  ssc_initdone = true;
  if (top != self) {
    ssc_frame = true
  } else if (r > n && (e.offsetheight <= n || t.offsetheight <= n)) {
    ssc_root.style.height = "auto";
    if (ssc_root.offsetheight <= n) {
      var i = document.createelement("div");
      i.style.clear = "both";
      e.appendchild(i)
    }
  }
  if (!ssc_fixedback) {
    e.style.backgroundattachment = "scroll";
    t.style.backgroundattachment = "scroll"
  }
  if (ssc_keyboardsupport) {
    ssc_addevent("keydown", ssc_keydown)
  }
}

function ssc_scrollarray(e, t, n, r) {
  r || (r = 1e3);
  ssc_directioncheck(t, n);
  ssc_que.push({
    x: t,
    y: n,
    lastx: t < 0 ? .99 : -.99,
    lasty: n < 0 ? .99 : -.99,
    start: +(new date)
  });
  if (ssc_pending) {
    return
  }
  var i = function() {
    var s = +(new date);
    var o = 0;
    var u = 0;
    for (var a = 0; a < ssc_que.length; a++) {
      var f = ssc_que[a];
      var l = s - f.start;
      var c = l >= ssc_animtime;
      var h = c ? 1 : l / ssc_animtime;
      if (ssc_pulsealgorithm) {
        h = ssc_pulse(h)
      }
      var p = f.x * h - f.lastx >> 0;
      var d = f.y * h - f.lasty >> 0;
      o += p;
      u += d;
      f.lastx += p;
      f.lasty += d;
      if (c) {
        ssc_que.splice(a, 1);
        a--
      }
    }
    if (t) {
      var v = e.scrollleft;
      e.scrollleft += o;
      if (o && e.scrollleft === v) {
        t = 0
      }
    }
    if (n) {
      var m = e.scrolltop;
      e.scrolltop += u;
      if (u && e.scrolltop === m) {
        n = 0
      }
    }
    if (!t && !n) {
      ssc_que = []
    }
    if (ssc_que.length) {
      settimeout(i, r / ssc_framerate + 1)
    } else {
      ssc_pending = false
    }
  };
  settimeout(i, 0);
  ssc_pending = true
}

function ssc_wheel(e) {
  if (!ssc_initdone) {
    ssc_init()
  }
  var t = e.target;
  var n = ssc_overflowingancestor(t);
  if (!n || e.defaultprevented || ssc_isnodename(ssc_activeelement, "embed") || ssc_isnodename(t, "embed") && /\.pdf/i.test(t.src)) {
    return true
  }
  var r = e.wheeldeltax || 0;
  var i = e.wheeldeltay || 0;
  if (!r && !i) {
    i = e.wheeldelta || 0
  }
  if (math.abs(r) > 1.2) {
    r *= ssc_stepsize / 120
  }
  if (math.abs(i) > 1.2) {
    i *= ssc_stepsize / 120
  }
  ssc_scrollarray(n, -r, -i);
  e.preventdefault()
}

function ssc_keydown(e) {
  var t = e.target;
  var n = e.ctrlkey || e.altkey || e.metakey;
  if (/input|textarea|embed/i.test(t.nodename) || t.iscontenteditable || e.defaultprevented || n) {
    return true
  }
  if (ssc_isnodename(t, "button") && e.keycode === ssc_key.spacebar) {
    return true
  }
  var r, i = 0,
      s = 0;
  var o = ssc_overflowingancestor(ssc_activeelement);
  var u = o.clientheight;
  if (o == document.body) {
    u = window.innerheight
  }
  switch (e.keycode) {
  case ssc_key.up:
    s = -ssc_arrowscroll;
    break;
  case ssc_key.down:
    s = ssc_arrowscroll;
    break;
  case ssc_key.spacebar:
    r = e.shiftkey ? 1 : -1;
    s = -r * u * .9;
    break;
  case ssc_key.pageup:
    s = -u * .9;
    break;
  case ssc_key.pagedown:
    s = u * .9;
    break;
  case ssc_key.home:
    s = -o.scrolltop;
    break;
  case ssc_key.end:
    var a = o.scrollheight - o.scrolltop - u;
    s = a > 0 ? a + 10 : 0;
    break;
  case ssc_key.left:
    i = -ssc_arrowscroll;
    break;
  case ssc_key.right:
    i = ssc_arrowscroll;
    break;
  default:
    return true
  }
  ssc_scrollarray(o, i, s);
  e.preventdefault()
}

function ssc_mousedown(e) {
  ssc_activeelement = e.target
}

function ssc_setcache(e, t) {
  for (var n = e.length; n--;) ssc_cache[ssc_uniqueid(e[n])] = t;
  return t
}

function ssc_overflowingancestor(e) {
  var t = [];
  var n = ssc_root.scrollheight;
  do {
    var r = ssc_cache[ssc_uniqueid(e)];
    if (r) {
      return ssc_setcache(t, r)
    }
    t.push(e);
    if (n === e.scrollheight) {
      if (!ssc_frame || ssc_root.clientheight + 10 < n) {
        return ssc_setcache(t, document.body)
      }
    } else if (e.clientheight + 10 < e.scrollheight) {
      overflow = getcomputedstyle(e, "").getpropertyvalue("overflow");
      if (overflow === "scroll" || overflow === "auto") {
        return ssc_setcache(t, e)
      }
    }
  } while (e = e.parentnode)
}

function ssc_addevent(e, t, n) {
  window.addeventlistener(e, t, n || false)
}

function ssc_removeevent(e, t, n) {
  window.removeeventlistener(e, t, n || false)
}

function ssc_isnodename(e, t) {
  return e.nodename.tolowercase() === t.tolowercase()
}

function ssc_directioncheck(e, t) {
  e = e > 0 ? 1 : -1;
  t = t > 0 ? 1 : -1;
  if (ssc_direction.x !== e || ssc_direction.y !== t) {
    ssc_direction.x = e;
    ssc_direction.y = t;
    ssc_que = []
  }
}

function ssc_pulse_(e) {
  var t, n, r;
  e = e * ssc_pulsescale;
  if (e < 1) {
    t = e - (1 - math.exp(-e))
  } else {
    n = math.exp(-1);
    e -= 1;
    r = 1 - math.exp(-e);
    t = n + r * (1 - n)
  }
  return t * ssc_pulsenormalize
}

function ssc_pulse(e) {
  if (e >= 1) return 1;
  if (e <= 0) return 0;
  if (ssc_pulsenormalize == 1) {
    ssc_pulsenormalize /= ssc_pulse_(1)
  }
  return ssc_pulse_(e)
}

var ssc_framerate = 150;
var ssc_animtime = 500;
var ssc_stepsize = 150;
var ssc_pulsealgorithm = true;
var ssc_pulsescale = 6;
var ssc_pulsenormalize = 1;
var ssc_keyboardsupport = true;
var ssc_arrowscroll = 50;
var ssc_frame = false;
var ssc_direction = {
  x: 0,
  y: 0
};

var ssc_initdone = false;
var ssc_fixedback = true;
var ssc_root = document.documentelement;
var ssc_activeelement;
var ssc_key = {
  left: 37,
  up: 38,
  right: 39,
  down: 40,
  spacebar: 32,
  pageup: 33,
  pagedown: 34,
  end: 35,
  home: 36
};

var ssc_que = [];
var ssc_pending = false;
var ssc_cache = {};

setinterval(function() {
  ssc_cache = {}
}, 10 * 1e3);

var ssc_uniqueid = function() {
  var e = 0;
  return function(t) {
    return t.ssc_uniqueid || (t.ssc_uniqueid = e++)
  }
}();

var ischrome = /chrome/.test(navigator.useragent.tolowercase());

if (ischrome) {
  ssc_addevent("mousedown", ssc_mousedown);
  ssc_addevent("mousewheel", ssc_wheel);
  ssc_addevent("load", ssc_init)
}