/* Formatting Rules
   ===========================================
 
   Use BEM naming convention --> http://getbem.com/naming/

   Groups:
   -------------
    1. Structure
    2. Font
    3. Effects
    4. Color

   Properties:
   -------------
    1. Display & Box Model (padding/border/margin)
    2. Height & Width
    3. Positioning
    4. Alphabetical
    5. Mixins
    6. Media Queries

 */
/* normalize.css v4.1.1 | MIT License | github.com/necolas/normalize.css */
/**
 * 1. Change the default font family in all browsers (opinionated).
 * 2. Prevent adjustments of font size after orientation changes in IE and iOS.
 */
@import url("https://fonts.googleapis.com/css?family=Baloo+Thambi|Signika");
html {
  font-family: sans-serif;
  /* 1 */
  -ms-text-size-adjust: 100%;
  /* 2 */
  -webkit-text-size-adjust: 100%;
  /* 2 */
}

/**
 * Remove the margin in all browsers (opinionated).
 */
body {
  margin: 0;
}

/* HTML5 display definitions
   ========================================================================== */
/**
 * Add the correct display in IE 9-.
 * 1. Add the correct display in Edge, IE, and Firefox.
 * 2. Add the correct display in IE.
 */
article,
aside,
details,
figcaption,
figure,
footer,
header,
main,
menu,
nav,
section,
summary {
  /* 1 */
  display: block;
}

/**
 * Add the correct display in IE 9-.
 */
audio,
canvas,
progress,
video {
  display: inline-block;
}

/**
 * Add the correct display in iOS 4-7.
 */
audio:not([controls]) {
  display: none;
  height: 0;
}

/**
 * Add the correct vertical alignment in Chrome, Firefox, and Opera.
 */
progress {
  vertical-align: baseline;
}

/**
 * Add the correct display in IE 10-.
 * 1. Add the correct display in IE.
 */
template,
[hidden] {
  display: none;
}

/* Links
   ========================================================================== */
/**
 * 1. Remove the gray background on active links in IE 10.
 * 2. Remove gaps in links underline in iOS 8+ and Safari 8+.
 */
a {
  background-color: transparent;
  /* 1 */
  -webkit-text-decoration-skip: objects;
  /* 2 */
}

/**
 * Remove the outline on focused links when they are also active or hovered
 * in all browsers (opinionated).
 */
a:active,
a:hover {
  outline-width: 0;
}

/* Text-level semantics
   ========================================================================== */
/**
 * 1. Remove the bottom border in Firefox 39-.
 * 2. Add the correct text decoration in Chrome, Edge, IE, Opera, and Safari.
 */
abbr[title] {
  border-bottom: none;
  /* 1 */
  text-decoration: underline;
  /* 2 */
  text-decoration: underline dotted;
  /* 2 */
}

/**
 * Prevent the duplicate application of `bolder` by the next rule in Safari 6.
 */
b,
strong {
  font-weight: inherit;
}

/**
 * Add the correct font weight in Chrome, Edge, and Safari.
 */
b,
strong {
  font-weight: bolder;
}

/**
 * Add the correct font style in Android 4.3-.
 */
dfn {
  font-style: italic;
}

/**
 * Correct the font size and margin on `h1` elements within `section` and
 * `article` contexts in Chrome, Firefox, and Safari.
 */
h1 {
  font-size: 2em;
  margin: 0.67em 0;
}

/**
 * Add the correct background and color in IE 9-.
 */
mark {
  background-color: #ff0;
  color: #000;
}

/**
 * Add the correct font size in all browsers.
 */
small {
  font-size: 80%;
}

/**
 * Prevent `sub` and `sup` elements from affecting the line height in
 * all browsers.
 */
sub,
sup {
  font-size: 75%;
  line-height: 0;
  position: relative;
  vertical-align: baseline;
}

sub {
  bottom: -0.25em;
}

sup {
  top: -0.5em;
}

/* Embedded content
   ========================================================================== */
/**
 * Remove the border on images inside links in IE 10-.
 */
img {
  border-style: none;
}

/**
 * Hide the overflow in IE.
 */
svg:not(:root) {
  overflow: hidden;
}

/* Grouping content
   ========================================================================== */
/**
 * 1. Correct the inheritance and scaling of font size in all browsers.
 * 2. Correct the odd `em` font sizing in all browsers.
 */
code,
kbd,
pre,
samp {
  font-family: monospace, monospace;
  /* 1 */
  font-size: 1em;
  /* 2 */
}

/**
 * Add the correct margin in IE 8.
 */
figure {
  margin: 1em 40px;
}

/**
 * 1. Add the correct box sizing in Firefox.
 * 2. Show the overflow in Edge and IE.
 */
hr {
  box-sizing: content-box;
  /* 1 */
  height: 0;
  /* 1 */
  overflow: visible;
  /* 2 */
}

/* Forms
   ========================================================================== */
/**
 * 1. Change font properties to `inherit` in all browsers (opinionated).
 * 2. Remove the margin in Firefox and Safari.
 */
button,
input,
select,
textarea {
  font: inherit;
  /* 1 */
  margin: 0;
  /* 2 */
}

/**
 * Restore the font weight unset by the previous rule.
 */
optgroup {
  font-weight: bold;
}

/**
 * Show the overflow in IE.
 * 1. Show the overflow in Edge.
 */
button,
input {
  /* 1 */
  overflow: visible;
}

/**
 * Remove the inheritance of text transform in Edge, Firefox, and IE.
 * 1. Remove the inheritance of text transform in Firefox.
 */
button,
select {
  /* 1 */
  text-transform: none;
}

/**
 * 1. Prevent a WebKit bug where (2) destroys native `audio` and `video`
 *    controls in Android 4.
 * 2. Correct the inability to style clickable types in iOS and Safari.
 */
button,
html [type="button"],
[type="reset"],
[type="submit"] {
  -webkit-appearance: button;
  /* 2 */
}

/**
 * Remove the inner border and padding in Firefox.
 */
button::-moz-focus-inner,
[type="button"]::-moz-focus-inner,
[type="reset"]::-moz-focus-inner,
[type="submit"]::-moz-focus-inner {
  border-style: none;
  padding: 0;
}

/**
 * Restore the focus styles unset by the previous rule.
 */
button:-moz-focusring,
[type="button"]:-moz-focusring,
[type="reset"]:-moz-focusring,
[type="submit"]:-moz-focusring {
  outline: 1px dotted ButtonText;
}

/**
 * Change the border, margin, and padding in all browsers (opinionated).
 */
fieldset {
  border: 1px solid #c0c0c0;
  margin: 0 2px;
  padding: 0.35em 0.625em 0.75em;
}

/**
 * 1. Correct the text wrapping in Edge and IE.
 * 2. Correct the color inheritance from `fieldset` elements in IE.
 * 3. Remove the padding so developers are not caught out when they zero out
 *    `fieldset` elements in all browsers.
 */
legend {
  box-sizing: border-box;
  /* 1 */
  color: inherit;
  /* 2 */
  display: table;
  /* 1 */
  max-width: 100%;
  /* 1 */
  padding: 0;
  /* 3 */
  white-space: normal;
  /* 1 */
}

/**
 * Remove the default vertical scrollbar in IE.
 */
textarea {
  overflow: auto;
}

/**
 * 1. Add the correct box sizing in IE 10-.
 * 2. Remove the padding in IE 10-.
 */
[type="checkbox"],
[type="radio"] {
  box-sizing: border-box;
  /* 1 */
  padding: 0;
  /* 2 */
}

/**
 * Correct the cursor style of increment and decrement buttons in Chrome.
 */
[type="number"]::-webkit-inner-spin-button,
[type="number"]::-webkit-outer-spin-button {
  height: auto;
}

/**
 * 1. Correct the odd appearance in Chrome and Safari.
 * 2. Correct the outline style in Safari.
 */
[type="search"] {
  -webkit-appearance: textfield;
  /* 1 */
  outline-offset: -2px;
  /* 2 */
}

/**
 * Remove the inner padding and cancel buttons in Chrome and Safari on OS X.
 */
[type="search"]::-webkit-search-cancel-button,
[type="search"]::-webkit-search-decoration {
  -webkit-appearance: none;
}

/**
 * Correct the text style of placeholders in Chrome, Edge, and Safari.
 */
::-webkit-input-placeholder {
  color: inherit;
  opacity: 0.54;
}

/**
 * 1. Correct the inability to style clickable types in iOS and Safari.
 * 2. Change font properties to `inherit` in Safari.
 */
::-webkit-file-upload-button {
  -webkit-appearance: button;
  /* 1 */
  font: inherit;
  /* 2 */
}

.no-padding {
  padding: 0 !important;
}

.no-border {
  border: none !important;
}

.no-margin {
  margin: 0 !important;
}

@-ms-viewport {
  width: device-width;
}

[tabindex="-1"]:focus {
  outline: none !important;
}

h1, h2, h3, h4, h5, h6 {
  margin-top: 0;
  margin-bottom: .5rem;
}

p {
  margin-top: 0;
  margin-bottom: 1rem;
}

ol,
ul,
dl {
  margin-top: 0;
  margin-bottom: 1rem;
}

ol ol,
ul ul,
ol ul,
ul ol {
  margin-bottom: 0;
}

img {
  vertical-align: middle;
}

html {
  -webkit-tap-highlight-color: transparent;
  -webkit-font-smoothing: antialiased;
}

.container-fluid {
  margin-left: auto;
  margin-right: auto;
  padding: 0;
}

.container-fluid::after {
  content: "";
  display: table;
  clear: both;
}

.link {
  outline: 0;
  text-decoration: none;
}

.link--underline {
  border-bottom: 0.0625rem solid;
}

.link {
  color: #3daed4;
  -webkit-transition-property: color;
  transition-property: color;
  -webkit-transition-duration: 0.3s;
  transition-duration: 0.3s;
  -webkit-transition-timing-function: ease-in;
  transition-timing-function: ease-in;
  -webkit-transition-delay: 0;
  transition-delay: 0;
}

.link:hover {
  color: #6FC3DF;
}

.link:active {
  color: #268bad;
}

.button {
  display: inline-block;
  cursor: pointer;
  text-align: center;
  white-space: nowrap;
}

.button--text {
  font-weight: bold;
  text-decoration: none;
}

.button {
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  -webkit-transform: translateZ(0);
  -ms-transform: translateZ(0);
  transform: translateZ(0);
}

.button:active {
  -webkit-transform: scale(0.9);
  -ms-transform: scale(0.9);
  transform: scale(0.9);
}

.button {
  -webkit-transition-property: transform, color, border;
  transition-property: transform, color, border;
  -webkit-transition-duration: 0.2s;
  transition-duration: 0.2s;
  -webkit-transition-timing-function: ease-in-out;
  transition-timing-function: ease-in-out;
  -webkit-transition-delay: 0;
  transition-delay: 0;
}

.button--text {
  background: transparent;
  color: #3daed4;
}

.button--text:hover {
  color: #2ca0c6;
}

.button--text:active {
  color: #268bad;
}

html {
  -webkit-box-sizing: border-box;
  box-sizing: border-box;
}

*,
*::before,
*::after {
  -webkit-box-sizing: inherit;
  box-sizing: inherit;
}

::-webkit-scrollbar {
  display: none;
}

html,
body {
  cursor: default;
  text-align: center;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

.container-fluid {
  opacity: 0;
}

.container-fluid.loaded {
  opacity: 1;
}

html,
body {
  font-family: "Signika", "Helevtica Neue", Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.375;
}

html,
body {
  background: #272727;
  color: #FFFFFF;
}

#header {
  margin: 0.9375rem 0;
}

@media all and (min-width: 43.75em) {
  #header {
    margin-top: 1.875rem;
  }
}

@media all and (min-width: 87.5em) {
  #header {
    margin-top: 2.5rem;
  }
}

#scoreboard {
  margin: 0.46875rem auto;
}

.score {
  margin-right: 0.46875rem;
}

.button {
  margin: 0 0.78125rem;
}

#scoreboard {
  font-size: 1.125rem;
}

#btnStart,
#btnSolve,
#btnChange {
  font-size: 1.25rem;
}

.puzzle {
  margin-right: auto;
  margin-left: auto;
  position: relative;
}

.puzzle__tile {
  border-top: solid 0.125rem transparent;
  border-right: solid 0.125rem transparent;
  border-bottom: solid 0.125rem transparent;
  border-left: solid 0.125rem transparent;
  position: absolute;
  background-image: url(../img/0.jpg);
  cursor: pointer;
  z-index: 1;
}

.puzzle__tile {
  opacity: 1;
  -webkit-transition-property: border, opacity;
  transition-property: border, opacity;
  -webkit-transition-duration: 0.5s;
  transition-duration: 0.5s;
  -webkit-transition-timing-function: ease-in-out;
  transition-timing-function: ease-in-out;
  -webkit-transition-delay: 0;
  transition-delay: 0;
}

.puzzle__tile--hidden {
  opacity: 0;
  z-index: 0;
}

.puzzle--tiled .puzzle__tile {
  border-top-color: rgba(255, 255, 255, 0.15);
  border-right-color: rgba(0, 0, 0, 0.2);
  border-bottom-color: rgba(0, 0, 0, 0.2);
  border-left-color: rgba(255, 255, 255, 0.15);
}

.puzzle {
  background: #343333;
  box-shadow: 0 0 1.5625rem 0.3125rem #1A1A1A, inset 0 0 4.6875rem 1.25rem #272727;
}

.puzzle__arrow {
  padding: 0.625rem;
  cursor: pointer;
  position: absolute;
  top: 50%;
  -webkit-transform: translateY(-50%);
  -ms-transform: translateY(-50%);
  transform: translateY(-50%);
}

.puzzle__arrow--left {
  left: 0;
}

.puzzle__arrow--right {
  right: 0;
}

.puzzle__arrow {
  opacity: 0;
  z-index: -1;
  -webkit-transition-property: opacity;
  transition-property: opacity;
  -webkit-transition-duration: 0.5s;
  transition-duration: 0.5s;
  -webkit-transition-timing-function: ease-in;
  transition-timing-function: ease-in;
  -webkit-transition-delay: 0;
  transition-delay: 0;
}

.puzzle--change .puzzle__arrow {
  opacity: 1;
  z-index: 10;
}

.puzzle__arrow {
  font-size: 2.5rem;
}

.puzzle__arrow {
  background: rgba(26, 26, 26, 0.7);
  color: #FFFFFF;
}

#options {
  margin-top: 0.9375rem;
}

.radio {
  margin: 0 0.46875rem;
  cursor: pointer;
}

#options {
  font-size: 1.125rem;
}

#footer {
  margin-top: 0.9375rem;
}

#footer {
  font-size: 1.125rem;
}