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HTML

              
                .text
    h1 Timodoro
.pos
    .center-it
        .left
            p(style='display: block') BREAK LENGTH
            a#minusbreak.btn.btn-lg.btn-default -
            p#break 20
            a#plusbreak.btn.btn-lg.btn-default +

        .right
            p(style='display: block') SESSION LENGTH
            a#minusSession.btn.btn-lg.btn-default -
            p#session 25
            a#plusSession.btn.btn-lg.btn-default +    
.clock
    h1#status start    
    h1#time
audio#finish(src='http://soundbible.com/grab.php?id=1446&type=mp3' type='audio/mp3')
              
            
!

CSS

              
                html, body 
  margin 0 auto
  padding 0
  background #C68000  
   
.text   
  font-family: 'Lobster', cursive;
  color #FFF  
  width 60vw  
  margin 0 auto  

.text > h1
  letter-spacing 5px
  text-align center
  font-size 6vmin
  text-shadow 1px 1px 5px #000      

.pos  
  padding 25px 15px 0px 15px
  margin-bottom 105px

.center-it
  width 300px
  margin 0 auto
 
.left 
  float left  
  text-align center
  
.right
  float right
  text-align center
  
.left > p, 
.right > p  
  display inline
  margin 10px
  font-family: 'Lato', sans-serif;
  color #FFF
  text-shadow 1px 1px 3px #000
  font-size 1em
 
.btns
  width 300px
  padding 25px 15px 0px 15px
  margin 0 auto  
  text-align center 
  
.btns a 
  text-align center
  font-family: 'Lato', sans-serif;
  
  margin 4px
  
.clock
  width 30vw
  height 30vw
  border-radius 50%
  border 2px solid #FFA500
  margin 20px auto
  background #FFB939
  box-shadow 1px 1px 15px #000
  text-align center

$media handheld 
  .clock 
    width 80vw
    height 80vw    
  
#status, #time
  font-family: 'Poiret One', cursive;
  color #FFF
  text-shadow 1px 1px 5px #000
  margin 7vw 0
  font-size 5vw

#status:hover
  cursor: crosshair;
  transform scale(1.2)
  transition 0.3s
              
            
!

JS

              
                /****
App allows you to use well known productivity technique called Pomodoro, where you work without interruption for period of time (25 minutes default) and make 5 minute break. 
App notifies user by playing horn sound at every session or break end.

It's mainly vanilla JS. Only library used is jQuery to control the DOM, and a bit of Bootstrap 3 to style the buttons.

Plan is to rewrite app with AngularJS to shorten the code with angular models and binding.
****/

//Widen this JS window for better readability. CodePen wraps lines. 
$(document).ready(function() {
  
  //Set initial values
	var setSessionMinutes = 25,
		setBreakMinutes = 5,
		sessionMinutes = setSessionMinutes,
		breakMinutes = setBreakMinutes,
		counterSeconds = -1,
		countTimeout,
		runState = false;
  
  //change values by buttons. First thing to rewrite in Angular
	$('#minusbreak').click(function() {
		$('#break').html(setBreakMinutes > 0 ? --setBreakMinutes : 0);
		breakMinutes = setBreakMinutes;
	});
  
	$('#plusbreak').click(function() {
		$('#break').html(++setBreakMinutes);
		breakMinutes = setBreakMinutes;
	});
  
	$('#minusSession').click(function() {
		$('#session').html(setSessionMinutes > 0 ? --setSessionMinutes : 0);
		$('#time').html(formatTime(setSessionMinutes, 0));
		sessionMinutes = setSessionMinutes;
	});
  
	$('#plusSession').click(function() {
		$('#session').html(++setSessionMinutes);
		$('#time').html(formatTime(setSessionMinutes, 0));
		sessionMinutes = setSessionMinutes;
	});
  
  // If user changes session/break lengths, update the DOM
	function setClockValues() {
		$('#break').html(setBreakMinutes);
		$('#session').html(setSessionMinutes);
		$('#time').html(formatTime(setSessionMinutes, 0));
		sessionMinutes = setSessionMinutes;
		breakMinutes = setBreakMinutes;
		counterSeconds = -1;
	};
  
	setClockValues();
  
  //Display minutes, seconds as regular clock would eg. 09:09 instead of 9:9
	function formatTime(minutes, seconds) {
		minutes = minutes >= 10 ? minutes : '0' + minutes;
		seconds = seconds >= 10 ? seconds : '0' + seconds;
		return minutes + ':' + seconds;
	}	
  
  // Count session time, decrement before variable to properly display time
	function countDown() {
		if (counterSeconds < 0 && sessionMinutes >= 0) {
			--sessionMinutes;
			counterSeconds = 59;
		}
		$('#time').html(formatTime(sessionMinutes, counterSeconds));
		--counterSeconds;
		if (counterSeconds >= 0 && sessionMinutes >= 0)
			countTimeout = setTimeout(countDown, 1000);
		else {
			$('#finish').get(0).play();
			setTimeout(countDownBreak, 1000);
		}
	}
  
  // Count break time, decrement before variable to properly display time 
	function countDownBreak() {
		if (counterSeconds < 0 && breakMinutes >= 0) {
			--breakMinutes;
			counterSeconds = 59;
		}
    
		$('#time').html(formatTime(breakMinutes, counterSeconds));
		--counterSeconds;
		if (counterSeconds >= 0 && breakMinutes >= 0)
			countTimeout = setTimeout(countDownBreak, 1000);
		else {
			stopCountDown();
			$('#status').html('start');
			runState = false;
			$('#finish').get(0).play();
		}
	}
    
	function stopCountDown() {
		clearTimeout(countTimeout);
		setClockValues();
	}

	// start/stop and reset timer, update the DOM
	$('#status').click(function() {
		switch (runState) {
			case false:
				$('#status').html('reset');
				countDown();
				runState = true;
				break;
			case true:
				$('#status').html('start');
				stopCountDown();
				runState = false;
				break;
		}
	});

});
              
            
!
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