@import url('https://fonts.googleapis.com/css?family=Nunito&display=swap');
* {
  margin: 0;
  padding: 0;
  -webkit-box-sizing: border-box;
          box-sizing: border-box;
  font-family: 'Nunito', sans-serif;
}

:focus{
  outline: 2px solid #888;
  outline-offset: 1px;
}



.math-game {
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  height: 100%;
  font-size: 3em;
}
.question {
  display: flex;
  justify-content: center;
  align-items: center;
}
.question > * {
  color: #333;
}
.previous-results {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  bottom: 55vh;
}
.previous-results > *:nth-last-child(1){opacity: 0.6; transform: scale(0.7);} 
.previous-results > *:nth-last-child(2){opacity: 0.3; transform: scale(0.5); bottom: -1em;} 
.previous-results > *:nth-last-child(3){opacity: 0.15; transform: scale(0.3);bottom: -2.5em;} 
.previous-results > *{opacity: 0; transform: scale(0.0);position: relative; z-index: 1;} 

.question.correct {border:1px solid #4cd137;}
.question.wrong {border:1px solid #f33;}

.question.correct .answered{color: #4cd137;}
.question.wrong .answered{color: #f33;}

.math-game input[type="submit"]{display: none;}
.math-game input{
}
input:disabled{
  background-color: #fff;
}
input[type=number]::-webkit-outer-spin-button,
input[type=number]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

input[type=number] {
    -moz-appearance:textfield;
}
.math-game input::-webkit-inner-spin-button {
  -webkit-appearance: none;
}
.math-game input {
  font-size: 100%;
  text-align: center;
  height: 2em;
  width: 2em;
  border: 1px solid #888;
  margin: 0.1em;
}

.ui {
  font-size: 0.8em;
  position: absolute;
  top: 15%;
  font-weight: bold;
  text-transform: uppercase;
  display: grid;
  visibility: hidden;
}
.ui.correct,
.ui.wrong {
  visibility: visible;
}
.ui span:last-child{
  font-size: 0.5em;
}
.ui span{
  text-align: center;
  display: block;
  color: #f33;
}
.ui.correct span {
  color: #4cd137;
}

.time,
.score {
  position: absolute;
  bottom: 50%;
  font-weight: bold;
  transform: translateX(-50%) translateY(200%);
  text-transform: uppercase;
  font-size: 2.5rem;
  width: 10rem;
  text-align: center;
}
.time {
  transform: translateX(50%) translateY(200%);
}

.time span,
.score span {
  display: block;
  text-align: center;
}
/*
// Modal //
*/
.modal {
  position: fixed;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  background-color: #000000dd;
  background-color: #fff;
  display: grid;
  align-content: center;
  justify-content: center;
  text-transform: uppercase;
  gap: 1.5rem;
  /* display: none; */
}
.modal.hide {
  display: none;
}
.modal > div {
  cursor: default;
}
.modal .title {
  text-align: center;
  font-size: 1.5rem;
}
.modal .title h1 {
  color: #000;
  background-image: url('./Arithmetic-Operation.svg');
  background-repeat: no-repeat;
  background-size: contain;
  background-position: center;
  padding: 2rem 0;
}
.modal .title span {
  display: block;
  font-size: 1rem;
}
.modal .help {
  width: max-content;
  margin: auto;
  text-decoration: underline;
  cursor: pointer;
}

.modal .select {
  text-align: center
}

.modal .buttons {
  display: grid;
  gap: 0.5rem;
  width: max-content;
  margin: auto;
}
.modal .buttons button {
  width: 15rem;
  height: 4rem;
  font-size: 1.5rem;
  border: 0;
  border-radius: 50rem;
  letter-spacing: 1px;
  cursor: pointer;
  outline: none;
  box-shadow: none;
  text-transform: uppercase;
}
.modal .buttons button:nth-child(1) {background-color: #00a8ff; color: #fff;}
.modal .buttons button:nth-child(2) {background-color: #4cd137; color: #fff;}
.modal .buttons button:nth-child(3) {background-color: #e84118; color: #fff;}
.modal .buttons button:nth-child(4) {background-color: #000; color: #fff;}
.modal .buttons button:active {
  transform: scale(0.95);
}

.instructions {
  position: absolute;
  top: 0;
  height: 100vh;
  width: 100%;
  background-color: #fff;
  z-index: 2;
  display: grid;
  justify-content: center;
  align-content: center;
}
.instructions.hide {
  display: none;
}

.instructions-card {
  display: grid;
  justify-content: center;
  align-content: center;
  gap: 1rem;
  max-width: 20rem;
}
.instructions-card > div {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 1rem;
  align-content: center;
  justify-content: center;
  align-items: center;
}
.instructions-card .icon {
  text-transform: uppercase;
  height: 4rem;
  width: 4rem;
  border-radius: 50%;
  color: #fff;
  font-size: 2rem;
  user-select: none;
  cursor: default;
  display: grid;
  justify-content: center;
  align-items: center;
}
.instructions-card .easy .icon{background-color: #00a8ff;}
.instructions-card .medium .icon{background-color: #4cd137;}
.instructions-card .hard .icon{background-color: #e84118;}
.instructions-card .impossible .icon{background-color: #000;}

.exit-instructions {
  cursor: pointer;
  text-decoration: underline;
  width: max-content;
  margin: auto;
  text-align: center;
}

.game-over {
  position: fixed;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  background-color: #000000dd;
}
.game-over .enter-name h2 {color: #f33; font-size: 250%;font-weight: bolder;}
.game-over .enter-name h1{color: #fff; font-size: 200%;font-weight: normal;}
.enter-name {
  display: grid;
  gap: 0.5rem;
  text-transform: uppercase;
  font-weight: bolder;
  color: #fff;
}
.enter-name > * {
  cursor: default;
}
.enter-name .options {
  margin-top: 1rem;
  display: grid;
  gap: 0.5rem;

}
.enter-name .change,
.enter-name .retry {
  cursor: pointer;
  text-decoration: underline;
}
.game-over input{
  cursor: auto;
  width: 15rem;
  border: 1px solid #333;
  border-radius: 2rem;
  outline: none;
  padding: 0.4rem;
  text-align: center;
  font-size: 150%;
}
.game-over table {
  max-width: 400px;
  font-size: 150%;
}
.game-over thead, .game-over tbody {
  background-color: #fff;
  border-bottom: 2px solid #000;
}
.game-over thead {background-color: #f33;}
.game-over td, .game-over th {padding: 0.5em;text-align: center;}
.game-over th {color: #fff;}

.leaderboard {
  display: grid;
  gap: 1rem;
  position: relative;
}
.leaderboard > div,
.leaderboard > h1 {
  color: #fff;
  text-transform: uppercase;
}
.leaderboard .options {
  position: absolute;
  right: 0;
  text-align: left;
  display: grid;
  gap: 1rem;
  transform: translateX(100%);
  padding-left: 1rem;
  padding-top: 4rem;
}
.leaderboard .options h3 {
  cursor: pointer;
  text-decoration: underline;
}


@media (max-height:600px) {



}

@media (max-width:800px) {
  .leaderboard .options {
    all: unset;
    color: #fff;
    text-transform: uppercase;
    display: grid;
    gap: 1rem;
  }
  .game-over table {
    width: 300px;
    font-size: 125%;
  }
  .previous-results > *:nth-last-child(1){opacity: 0; transform: scale(0.7);} 
  .previous-results > *:nth-last-child(2){opacity: 0; transform: scale(0.5); bottom: -1em;} 
  .previous-results > *:nth-last-child(3){opacity: 0; transform: scale(0.3);bottom: -2.5em;} 
}
@media (max-width:500px) {
  .leaderboard {
    max-width: 90%;
    margin: auto;
    font-size: 14px;
  }
}

@media (max-width:400px) {
  :root{
    font-size: 14px;
  }
}

/* Powered By */
.powered-by img {
  display: block;
  height: 48px;
}
.powered-by p:first-of-type {
  display: inline;
  color:  #3328fe;
}
.powered-by p {
  display: inline;
  color:  #3328fe;
}
.powered-by {
  background-color: #fff;
  font-size: 16px;
  position: fixed;
  gap: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  right: 0.5rem;
  padding: 0.5rem 1.5rem;
  border-top-left-radius: 0.5rem;
  border-top-right-radius: 0.5rem;
  box-shadow: 0px 2px 6px 3px #33333330;
  bottom: 0;
  z-index: 99;
  text-decoration: none;
}