.clearfix {
  *zoom: 1;
}
.clearfix:before,
.clearfix:after {
  display: table;
  content: "";
  line-height: 0;
}
.clearfix:after {
  clear: both;
}
.hide-text {
  font: 0/0 a;
  color: transparent;
  text-shadow: none;
  background-color: transparent;
  border: 0;
}
.input-block-level {
  display: block;
  width: 100%;
  min-height: 30px;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box;
}
#khanType {
  /* Used to style the topic title on a topic page, eg
  "Introduction to algebra" on /math/algebra/introduction-to-algebra.
  Also used for the tutorial title on tutorial landing pages.
  Not restricted to styling the titles of "Topic" entities. */
}
.vertical-shadow {
  border: 1px solid #ccc;
  border-bottom: 1px solid #aaa;
  box-shadow: 0 1px 3px #ccc;
}
html.page-container-min-width-zero body,
html.page-container-min-width-zero #page-container {
  min-width: 0;
}
/* Fall back colors? Eg educator, talks & interviews */
/*a light mint color*/
/* grey */
/* the default card/stack view */
/* this handles much of pre-tutorials exercise layout which is encapsulated in
  stacks and cards: i.e. the stack of mini cards, the big exercise card, etc.

*/
.current-card-container {
  position: relative;
}
.current-card-container-inner {
  background-color: #fdfdfd;
}
.card-type-endofstack .current-card-container-inner {
  background-color: #E9EFDD;
}
.current-card-container,
.current-card-container-inner {
  transition: all 0.18s ease-in-out;
}
.card-type-endofstack #extras {
  visibility: hidden;
}
.card-type-endoftask #extras {
  display: none;
}
.exercises-stack,
.exercises-card {
  float: left;
  width: 7%;
  /* margin-bottom: -9999px;
    padding-bottom: 9999px; */
  box-sizing: border-box;
}
.exercises-card {
  width: 86%;
}
.exercises-card.full-width {
  width: 98%;
}
.current-card {
  position: relative;
  margin-bottom: 20px;
  -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
}
.current-card > * {
  -webkit-tap-highlight-color: rgba(26, 26, 26, 0.301961);
}
.current-card #answer_area_wrap {
  margin: 10px -8px 0 0;
}
.current-card #answer_area .info-box {
  overflow: visible;
}
.current-card .info-box:before {
  content: " ";
  display: block;
  border-right: 8px solid transparent;
  border-bottom: 8px solid #ccc;
  width: 0;
  height: 16px;
  position: absolute;
  right: -1px;
  top: -24px;
}
.card-type-endofstack .current-card-contents {
  padding: 20px;
}
.current-card #problemarea {
  margin-top: 35px;
}
.current-card #workarea {
  margin-top: 22px;
}
.current-card #answer_area_wrap {
  margin-top: 52px;
}
#footer {
  /*
     * This crazy little sucker invokes a different rendering path
     * for the entire page, even though it's only applied to the footer.
     *
     * This hints to webkit that GPU acceleration should be used where
     * possible, which fixes this annoying bug: http://code.google.com/p/chromium/issues/detail?id=103198
     * as well as any screen flicker on macs when switching to/from GPU
     * rendering.
     *
     * If another fix for this bug is found, this can be removed.
     * See "the magic CSS bullet" here: http://www.html5rocks.com/en/tutorials/speed/html5/#toc-hardware-accell
     *
     * */
  transform: translateZ(0);
}
@media (max-width: 1199px) {
  #footer.web-tablet-exercise-footer {
    display: none;
  }
}
/* "Calculating End of Stack" Card Styling */
.calculating-end-of-stack {
  height: 380px;
  padding: 50px;
  text-align: center;
}
.calculating-end-of-stack .calc-text-spin {
  position: relative;
  top: -15px;
}
.calculating-end-of-stack .calc-text-spin span {
  display: none;
}
.calculating-end-of-stack .spinner {
  position: relative;
  top: -5px;
}
/**
  * General Exercise area styling
  */
.exercises-content {
  padding-left: 0;
  padding-right: 0;
}
.exercises-body {
  min-height: 380px;
}
.exercises-header .topic-exercise-badge {
  width: 7%;
}
.exercises-header .topic-exercise-image {
  width: 40px;
  height: 40px;
}
.exercises-header .topic-exercise-image.inline {
  display: inline-block;
  margin: -50% 0;
}
.exercises-header .practice-exercise-topic-context {
  transition: opacity 0.1s ease-in-out;
  opacity: 0.3;
  backface-visibility: hidden;
}
.exercises-header .practice-exercise-topic-context.solid-hover:hover {
  opacity: 1;
}
.exercises-header .practice-exercise-topic-context .topic-exercise-badge {
  width: 20px;
  height: 20px;
  margin-right: 2px;
}
/**
 * Bibliotron exercise style resets
 */
.bibliotron-exercise .exercise-task {
  position: static !important;
}
.bibliotron-exercise .exercises-content {
  max-width: none !important;
  position: static;
}
.bibliotron-exercise .exercises-body {
  min-height: 0;
}
.bibliotron-exercise .exercises-card {
  margin-bottom: 0;
  position: static;
  width: 100%;
}
.bibliotron-exercise .exercises-card.full-width {
  width: 100%;
}
.bibliotron-exercise .current-card-container {
  position: static;
}
.bibliotron-exercise .current-card-container-inner {
  background-color: #fff;
  border: 0;
  box-shadow: none;
}
.bibliotron-exercise #extras {
  display: none;
}
.bibliotron-exercise #problemarea {
  margin: 0 !important;
  min-height: 0;
  padding: 0;
  width: 100%;
}
@media (max-width: 767px) {
  .bibliotron-exercise #problemarea {
    margin-bottom: 50px !important;
  }
}
.bibliotron-exercise #workarea {
  margin: 0 !important;
}
.bibliotron-exercise .perseus-xom-manatee #hintsarea {
  margin: 0 !important;
}
.bibliotron-exercise .perseus-mobile #hintsarea {
  margin: 0 !important;
}
/**
 * our .@{domain} {color: white;} overrides mathjax eqs
 * FIXME(marcos): domain-colors mixins should not define color: @white;
 * except for in actual mixins, but not for .math, .{@domain}, et al.
 */
.MathJax .math {
  color: #444;
}