* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Nunito', Arial, Helvetica, sans-serif;
  background-color: #181818;
  color: #dfdfdf;
}

button {
  font-family: inherit;
}

.container {
  width: 100%;
  max-width: 960px;
  margin: 0 auto;
  padding: 0 30px;
  position: relative;
}

.site-title {
  font-size: 54px;
  text-align: center;
  color: #fff;
}

.section-title {
  font-size: 28px;
  text-align: center;
  margin-bottom: 35px;
}

.section-subtitle {
  font-size: 24px;
  text-align: center;
  margin-bottom: 35px;
}

.category-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  column-gap: 30px;
  row-gap: 30px;
}

@media (max-width: 820px) {
  .category-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 640px) {
  .category-list {
    grid-template-columns: repeat(1, 1fr);
  }
}

.category {
  --padding-x: 20px;
  --padding-y: 15px;
  --background-color: #282828;

  margin: 0;
  cursor: pointer;
  background-color: var(--background-color);
  padding-bottom: var(--padding-y);
}

.category header,
.puzzle-slide header {
  overflow: hidden;
  border: 1px solid #202020;
}

.category-thumbnail {
  display: block;
  width: 100%;
  transition: transform 0.1s ease-in;
}

.category:hover .category-thumbnail {
  transform: scale(1.025);
}

.category-body {
  background-color: var(--background-color);
}

.category-title {
  padding: var(--padding-y) var(--padding-x) 0;
  font-size: 22px;
  font-weight: bold;
}

.category-puzzle-count {
  padding: 0 var(--padding-x);
  color: #888;
  font-size: 12px;
}

.btn {
  background-color: rgb(214, 80, 80);
  border: none;
  color: #fff;
  padding: 0.5em 1em;
  font-family: inherit;
  font-size: 14px;
  cursor: pointer;
  transition: background-color 0.1s ease-in-out;
}

.btn:hover {
  background-color: rgb(185, 69, 69);
}

.btn-back {
  margin-bottom: 20px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.btn-back img {
  margin-right: 10px;
}

.btn-mode {
  background-color: rgb(43, 132, 233);
  margin: 0 10px;
}

.btn-mode:hover {
  background-color: rgb(35, 104, 184);
}

.btn-mode:disabled {
  background-color: #888;
  color: #bbb;
  cursor: not-allowed;
}

.puzzle-slider {
  display: flex;
  justify-content: center;
  position: relative;
}

.puzzle-slider-inner {
  display: flex;
}

.puzzle-slide {
  min-width: 100%;
}

.puzzle-slider-outer {
  width: 150px;
  overflow-x: hidden;
}

.puzzle-slider-controls {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
}

.puzzle-slider .btn-control {
  position: relative;
}

.btn-control {
  background-color: transparent;
  border: none;
  cursor: pointer;
  outline: none;
  transition: transform 0.1s ease-out;
  padding: 0;
}

.btn-control:hover {
  transform: scale(1.15);
}

.btn-previous {
  left: -100px;
}

.btn-next {
  right: -100px;
}

.text-white {
  color: #fff;
}

.text-center {
  text-align: center;
}

#app-errors {
  margin: 30px;
  text-align: center;
  font-size: 20px;
}

.center {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.mt-0 {
  margin-top: 0;
}

.mode-buttons {
  margin-top: 20px;
}

.game-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  width: 1024px;
  margin: 0 auto;
  padding-top: 20px;
}

@media (max-width: 1060px) {
  .game-grid {
    width: 100%;
    grid-template-columns: repeat(1, 1fr);
  }
}

.game-left {
  display: flex;
  align-items: center;
  flex-direction: column;
  justify-content: center;
}

.game-right {
  display: flex;
  align-items: flex-start;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.game-column {
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
}

.game-left .game-column {
  padding-bottom: 100px;
}

.puzzle-slide {
  padding-bottom: 0;
  margin: 0;
  background-color: #282828;
  display: flex;
  flex-direction: column;
}

.puzzle-slide .category-body {
  flex-grow: 1;
  padding-bottom: 10px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.puzzle-slide header {
  overflow: hidden;
}

.puzzle-slide-title {
  font-size: 16px;
  padding: 10px 12.5px 0;
  text-align: center;
}

.puzzle-slide-thumbnail {
  display: block;
  width: 100%;
}

.puzzle-canvas {
  max-width: 100%;
  border: 1px solid #444;
}

@media (max-width: 1060px) {
  .puzzle-canvas {
    margin-top: 60px;
  }
}

.cursor-pointer {
  cursor: pointer;
}

.digital-timer {
  position: absolute;
  bottom: 0;
}

.shadow {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  background-color: rgba(0, 0, 0, 0.5);
  animation-name: fade-in;
  animation-duration: 0.5s;
  animation-timing-function: ease-in-out;
  animation-fill-mode: both;
}

.dialog {
  position: relative;
  top: 50%;
  left: 50%;
  background-color: #202020;
  padding: 30px 80px 30px;
  opacity: 0;
  color: #999;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  max-width: 600px;
  animation-name: dialog-show;
  animation-duration: 0.5s;
  animation-timing-function: ease-in-out;
  animation-fill-mode: both;
}

.dialog-title {
  font-size: 38px;
  font-weight: bold;
  margin-bottom: 20px;
  color: #bbb;
}

.dialog-subtitle {
  font-size: 20px;
  font-weight: bold;
}

.dialog-solved-in {
  color: #fff;
}

.dialog-puzzle-preview-wrapper {
  position: relative;
  width: 200px;
  margin: 40px 0 20px;
}

.dialog-puzzle-preview-label {
  position: absolute;
  left: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.65);
  color: #fff;
  padding: 5px 15px;
}

.dialog-puzzle-preview {
  display: block;
  width: 100%;
  border: 1px solid #333;
}

.dialog-puzzle-name {
  color: #fff;
  font-size: 24px;
  font-weight: bold;
}

.dialog-category-name {
  padding-bottom: 10px;
}

.fade-out {
  animation-name: fade-out;
  animation-duration: 0.5s;
  animation-timing-function: ease-in-out;
  animation-fill-mode: both;
}

.dialog .btn {
  width: 250px;
  margin-top: 10px;
}

.btn-secondary {
  background-color: #555;
}

.dialog .btn-close {
  position: absolute;
  top: 20px;
  right: 20px;
}

.dialog .btn-close img {
  width: 16px;
  height: 16px;
}

.btn-secondary:hover {
  background-color: #444;
}

.dialog-input {
  width: 250px;
  margin: 15px 0 0;
  background-color: #444;
  border: 1px solid #555;
  font-family: inherit;
  outline: none;
  color: #fff;
  text-align: center;
  padding: 5px 10px;
}

.dialog-content {
  width: 100%;
}

.shake {
  animation-name: shake;
  animation-duration: 0.5s;
  animation-timing-function: ease-in-out;
}

.dialog-high-scores {
  width: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.dialog-high-scores .dialog-puzzle-preview-wrapper {
  margin-top: 10px;
}

.dialog-high-score-list {
  width: 100%;
  padding-top: 20px;
}

.hs-row {
  display: flex;
  text-align: center;
  border-bottom: 1px solid #555;
  padding: 0 10px;
  position: relative;
}

.highlight {
  background-color: #303a46;
}

.highlight-arrow {
  position: absolute;
  width: 12px;
  top: 50%;
  transform: translateY(-50%);
}

.highlight-arrow.left {
  right: -25px;
}

.highlight-arrow.right {
  left: -25px;
}

.hs-row:nth-child(1) {
  color: gold;
  font-weight: bold;
}

.hs-row:nth-child(2),
.hs-row:nth-child(3) {
  color: #ddd;
}

.hs-col {
  padding: 5px;
}

.hs-place {
  flex-basis: 20px;
}

.hs-time {
  margin-right: 10px;
  flex-basis: 120px;
  text-align: center;
}

.hs-nickname {
  flex-basis: auto;
  flex-grow: 1;
}

.dialog-game-ended {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.btn-high-scores-header {
  color: #666;
  position: absolute;
  right: 35px;
  top: -25px;
  font-size: 16px;
  font-weight: bold;
  transition: all 0.1s ease-out;
}

.btn-high-scores-header:hover {
  color: #888;
}

.dialog-score-chooser-score-list {
  text-align: left;
}

.dialog-score-chooser-score-list > div {
  margin-top: 12px;
  cursor: pointer;
  transition: color 0.1s ease-out;
  color: #bbb;
}

.dialog-score-chooser-score-list > div:hover {
  color: #fff;
}

.clickable {
  transition: all 0.1s ease-out;
  cursor: pointer;
}

.clickable:hover {
  transform: scale(1.05);
}

.control-invalid {
  background-color: #3c3030;
    border: 1px solid #633b3b;
}

.control-invalid::placeholder {
  color: #884545;;
}

.dialog-new-best {
  margin-top: 25px;
  font-size: 24px;
  color: gold;
  font-weight: bold;
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.dialog-star {
  width: 0.9em;
  margin-bottom: 0.1em;
}

.dialog-star.star-left {
  margin-right: 12px;
}

.dialog-star.star-right {
  margin-left: 12px;
}

.dialog-place {
  margin-top: 25px;
  font-size: 22px;
  color: #666;
  font-weight: bold;
}

.dialog-puzzle-title {
  color: #eee;
}

.dialog-recommended .dialog-title {
  font-size: 28px;
}

.dialog-recommended .dialog-puzzle-list {
  margin-top: 30px;
  margin-bottom: 30px;
  display: flex;
  justify-content: center;
  column-gap: 20px;
}

.dialog-recommended .puzzle-slide {
  min-width: auto;
  width: 140px;
  cursor: pointer;
}

.dialog-recommended .puzzle-slide-thumbnail {
  transition: all 0.1s ease-out;
}

.dialog-recommended .puzzle-slide:hover .puzzle-slide-thumbnail {
  transform: scale(1.05);
}

.dialog-recommended .puzzle-slide-title {
  transition: all 0.1s ease-out;
}

.dialog-recommended .puzzle-slide:hover .puzzle-slide-title {
  color: #ddd;
}

.dialog-error .dialog-title {
  font-size: 25px;
  color: rgb(160, 15, 15);
}

.dialog-error .dialog-message {
  color: #bbb;
}

@keyframes fade-in {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}

@keyframes fade-out {
  0% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}

@keyframes dialog-show {
  0% {
    opacity: 0;
    transform: translate(-50%, calc(-50% - 30px));
  }
  100% {
    opacity: 1;
    transform: translate(-50%, -50%);
  }
}

@keyframes shake {
  0% {
    transform: translateX(-10px);
  }
  25% {
    transform: translateX(7.5px);
  }
  50% {
    transform: translateX(-4px);
  }
  75% {
    transform: translateX(2px);
  }
  100% {
    transform: none;
  }
}