(function(){
  function init(){
    var canvas = document.getElementById('effectiveAppsSnow');
    if (!canvas) return;
    var context = canvas.getContext('2d');
    var viewportWidth = window.innerWidth;
    var viewportHeight = window.innerHeight;
    var devicePixelRatio = window.devicePixelRatio || 1;

    function resizeCanvas(){
      viewportWidth = window.innerWidth;
      viewportHeight = window.innerHeight;
      var displayWidth = viewportWidth;
      var displayHeight = viewportHeight;
      canvas.style.width = displayWidth + 'px';
      canvas.style.height = displayHeight + 'px';
      canvas.width = Math.floor(displayWidth * devicePixelRatio);
      canvas.height = Math.floor(displayHeight * devicePixelRatio);
      context.setTransform(devicePixelRatio, 0, 0, devicePixelRatio, 0, 0);
    }

    resizeCanvas();

    var snowflakeCount = Math.floor(Math.min(400, Math.max(120, (viewportWidth * viewportHeight) / 12000)));
    var snowflakes = [];
    for (var i = 0; i < snowflakeCount; i++){
      snowflakes.push({
        positionX: Math.random() * viewportWidth,
        positionY: Math.random() * viewportHeight,
        radius: Math.random() * 2 + 1,
        driftSpeed: Math.random() * 0.6 + 0.4,
        swingAmplitude: Math.random() * 0.8 + 0.2
      });
    }

    function updateSnowflakes(){
      for (var j = 0; j < snowflakes.length; j++){
        var flake = snowflakes[j];
        flake.positionY += flake.driftSpeed * 2 + flake.radius * 0.25;
        flake.positionX += Math.sin(flake.positionY * 0.01) * flake.swingAmplitude;
        if (flake.positionY > viewportHeight + 5){
          flake.positionY = -5;
          flake.positionX = Math.random() * viewportWidth;
          flake.radius = Math.random() * 2 + 1;
          flake.driftSpeed = Math.random() * 0.6 + 0.4;
          flake.swingAmplitude = Math.random() * 0.8 + 0.2;
        }
      }
    }

    function drawSnowflakes(){
      context.clearRect(0, 0, viewportWidth, viewportHeight);
      context.fillStyle = 'rgba(255,255,255,0.9)';
      context.beginPath();
      for (var k = 0; k < snowflakes.length; k++){
        var flake = snowflakes[k];
        context.moveTo(flake.positionX, flake.positionY);
        context.arc(flake.positionX, flake.positionY, flake.radius, 0, Math.PI * 2);
      }
      context.fill();
    }

    function animate(){
      updateSnowflakes();
      drawSnowflakes();
      requestAnimationFrame(animate);
    }

    window.addEventListener('resize', function(){
      resizeCanvas();
      viewportWidth = window.innerWidth;
      viewportHeight = window.innerHeight;
    });

    animate();
  }

  if (document.readyState === 'loading'){
    document.addEventListener('DOMContentLoaded', init);
  } else {
    init();
  }
})();