* {
  margin: 0;
  padding: 0;
}

body {
  background-color: #f1f2f3;
}

.container {
  box-sizing: border-box;
  max-width: 1560px;
  min-width: 1240px;
  width: 100%;
  margin: 20px auto;
  color: #333;
}

.container * {
  box-sizing: border-box;
}

header {
  text-align: center;
  margin-bottom: 25px;
}

header h1 {
  font-size: 2.1rem;
  margin-bottom: 10px;
  color: #2c3e50;
}

header p {
  font-size: 1.1rem;
  color: #7f8c8d;
  max-width: 90%;
  margin: 0 auto;
  line-height: 1.6;
}

.game-area {
  display: flex;
  gap: 20px;
  width: 100%;
  margin-bottom: 25px;
}


.instructions, .game-board-container {
  flex: 1;
  background: white;
  border-radius: 10px;
  padding: 25px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}
.game-board-container {

}
.instructions h2 {
  margin-bottom: 15px;
  color: #8f7a66;
}

.instructions ul {
  padding-left: 25px;
  margin: 15px 0;
}

.instructions li {
  margin: 10px 0;
  line-height: 1.5;
}

.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-bottom: 25px;
}

.feature-card {
  background: white;
  border-radius: 10px;
  padding: 25px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
  transition: transform 0.3s;
}

.feature-card:hover {
  transform: translateY(-5px);
}

.feature-card h3 {
  font-size: 22px;
  margin-bottom: 15px;
  color: #8f7a66;
  display: flex;
  align-items: center;
  gap: 10px;
}

.feature-card p {
  line-height: 1.6;
  color: #666;
}

.game-description {
  background: white;
  border-radius: 10px;
  padding: 20px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
}

.game-description h2 {
  font-size: 26px;
  margin-bottom: 10px;
  color: #8f7a66;
}

.game-description p {
  line-height: 1.7;
  margin-bottom: 10px;
}

@-webkit-keyframes move-up {
    0% {
        top: 25px;
        opacity: 1;
    }
    100% {
        top: -50px;
        opacity: 0;
    }
}

@-moz-keyframes move-up {
    0% {
        top: 25px;
        opacity: 1;
    }
    100% {
        top: -50px;
        opacity: 0;
    }
}

@keyframes move-up {
    0% {
        top: 25px;
        opacity: 1;
    }
    100% {
        top: -50px;
        opacity: 0;
    }
}

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

.score-container,
.best-container {
    box-sizing: content-box !important;
    position: relative;
    display: inline-block;
    background: #bbada0;
    padding: 20px 25px;
    font-size: 25px;
    height: 25px;
    line-height: 47px;
    font-weight: bold;
    border-radius: 6px;
    color: white;
    margin: 0 10px;
    min-width: 80px;
    text-align: center;
}

.score-container:after,
.best-container:after {
    position: absolute;
    width: 100%;
    top: 10px;
    left: 0;
    text-transform: uppercase;
    font-size: 13px;
    line-height: 13px;
    text-align: center;
    color: #eee4da;
}

.score-container .score-addition,
.best-container .score-addition {
    position: absolute;
    right: 30px;
    color: red;
    font-size: 25px;
    line-height: 25px;
    font-weight: bold;
    color: rgba(119, 110, 101, 0.9);
    z-index: 100;
    -webkit-animation: move-up 600ms ease-in;
    -moz-animation: move-up 600ms ease-in;
    animation: move-up 600ms ease-in;
    -webkit-animation-fill-mode: both;
    -moz-animation-fill-mode: both;
    animation-fill-mode: both;
}

.score-container:after {
    content: "Score";
}

.best-container:after {
    content: "Best";
}



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

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

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

.game-container {
    margin: auto;
    margin-top: 30px;
    position: relative;
    padding: 15px;
    cursor: default;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    background: #bbada0;
    border-radius: 6px;
    width: 500px;
    height: 500px;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}

.game-container .game-message {
    display: none;
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background: rgba(238, 228, 218, 0.5);
    z-index: 100;
    text-align: center;
    -webkit-animation: fade-in 800ms ease 1200ms;
    -moz-animation: fade-in 800ms ease 1200ms;
    animation: fade-in 800ms ease 1200ms;
    -webkit-animation-fill-mode: both;
    -moz-animation-fill-mode: both;
    animation-fill-mode: both;
}

.game-container .game-message p {
    font-size: 60px;
    font-weight: bold;
    height: 60px;
    line-height: 60px;
    margin-top: 222px;
}

.game-container .game-message .lower {
    display: block;
    margin-top: 59px;
}

.game-container .game-message a {
    display: inline-block;
    background: #8f7a66;
    border-radius: 3px;
    padding: 0 20px;
    text-decoration: none;
    color: #f9f6f2;
    height: 40px;
    line-height: 42px;
    margin-left: 9px;
}

.game-container .game-message a.keep-playing-button {
    display: none;
}

.game-container .game-message.game-won {
    background: rgba(237, 194, 46, 0.5);
    color: #f9f6f2;
}

.game-container .game-message.game-won a.keep-playing-button {
    display: inline-block;
}

.game-container .game-message.game-won,
.game-container .game-message.game-over {
    display: block;
}

.grid-container {
    position: absolute;
    z-index: 1;
}

.grid-row {
    margin-bottom: 15px;
}

.grid-row:last-child {
    margin-bottom: 0;
}

.grid-row:after {
    content: "";
    display: block;
    clear: both;
}

.grid-cell {
    width: 106.25px;
    height: 106.25px;
    margin-right: 15px;
    float: left;
    border-radius: 3px;
    background: rgba(238, 228, 218, 0.35);
}

.grid-cell:last-child {
    margin-right: 0;
}

.tile-container {
    position: absolute;
    z-index: 2;
}

.tile,
.tile .tile-inner {
    width: 107px;
    height: 107px;
    line-height: 116.25px;
}

.tile.tile-position-1-1 {
    -webkit-transform: translate(0px, 0px);
    -moz-transform: translate(0px, 0px);
    transform: translate(0px, 0px);
}

.tile.tile-position-1-2 {
    -webkit-transform: translate(0px, 121px);
    -moz-transform: translate(0px, 121px);
    transform: translate(0px, 121px);
}

.tile.tile-position-1-3 {
    -webkit-transform: translate(0px, 242px);
    -moz-transform: translate(0px, 242px);
    transform: translate(0px, 242px);
}

.tile.tile-position-1-4 {
    -webkit-transform: translate(0px, 363px);
    -moz-transform: translate(0px, 363px);
    transform: translate(0px, 363px);
}

.tile.tile-position-2-1 {
    -webkit-transform: translate(121px, 0px);
    -moz-transform: translate(121px, 0px);
    transform: translate(121px, 0px);
}

.tile.tile-position-2-2 {
    -webkit-transform: translate(121px, 121px);
    -moz-transform: translate(121px, 121px);
    transform: translate(121px, 121px);
}

.tile.tile-position-2-3 {
    -webkit-transform: translate(121px, 242px);
    -moz-transform: translate(121px, 242px);
    transform: translate(121px, 242px);
}

.tile.tile-position-2-4 {
    -webkit-transform: translate(121px, 363px);
    -moz-transform: translate(121px, 363px);
    transform: translate(121px, 363px);
}

.tile.tile-position-3-1 {
    -webkit-transform: translate(242px, 0px);
    -moz-transform: translate(242px, 0px);
    transform: translate(242px, 0px);
}

.tile.tile-position-3-2 {
    -webkit-transform: translate(242px, 121px);
    -moz-transform: translate(242px, 121px);
    transform: translate(242px, 121px);
}

.tile.tile-position-3-3 {
    -webkit-transform: translate(242px, 242px);
    -moz-transform: translate(242px, 242px);
    transform: translate(242px, 242px);
}

.tile.tile-position-3-4 {
    -webkit-transform: translate(242px, 363px);
    -moz-transform: translate(242px, 363px);
    transform: translate(242px, 363px);
}

.tile.tile-position-4-1 {
    -webkit-transform: translate(363px, 0px);
    -moz-transform: translate(363px, 0px);
    transform: translate(363px, 0px);
}

.tile.tile-position-4-2 {
    -webkit-transform: translate(363px, 121px);
    -moz-transform: translate(363px, 121px);
    transform: translate(363px, 121px);
}

.tile.tile-position-4-3 {
    -webkit-transform: translate(363px, 242px);
    -moz-transform: translate(363px, 242px);
    transform: translate(363px, 242px);
}

.tile.tile-position-4-4 {
    -webkit-transform: translate(363px, 363px);
    -moz-transform: translate(363px, 363px);
    transform: translate(363px, 363px);
}

.tile {
    position: absolute;
    -webkit-transition: 100ms ease-in-out;
    -moz-transition: 100ms ease-in-out;
    transition: 100ms ease-in-out;
    -webkit-transition-property: -webkit-transform;
    -moz-transition-property: -moz-transform;
    transition-property: transform;
}

.tile .tile-inner {
    border-radius: 3px;
    background: #eee4da;
    text-align: center;
    font-weight: bold;
    z-index: 10;
    font-size: 55px;
}

.tile.tile-2 .tile-inner {
    background: #eee4da;
    box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0), inset 0 0 0 1px rgba(255, 255, 255, 0);
}

.tile.tile-4 .tile-inner {
    background: #ede0c8;
    box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0), inset 0 0 0 1px rgba(255, 255, 255, 0);
}

.tile.tile-8 .tile-inner {
    color: #f9f6f2;
    background: #f2b179;
}

.tile.tile-16 .tile-inner {
    color: #f9f6f2;
    background: #f59563;
}

.tile.tile-32 .tile-inner {
    color: #f9f6f2;
    background: #f67c5f;
}

.tile.tile-64 .tile-inner {
    color: #f9f6f2;
    background: #f65e3b;
}

.tile.tile-128 .tile-inner {
    color: #f9f6f2;
    background: #edcf72;
    box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0.2381), inset 0 0 0 1px rgba(255, 255, 255, 0.14286);
    font-size: 45px;
}

@media screen and (max-width: 520px) {
    .tile.tile-128 .tile-inner {
        font-size: 25px;
    }
}

.tile.tile-256 .tile-inner {
    color: #f9f6f2;
    background: #edcc61;
    box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0.31746), inset 0 0 0 1px rgba(255, 255, 255, 0.19048);
    font-size: 45px;
}

@media screen and (max-width: 520px) {
    .tile.tile-256 .tile-inner {
        font-size: 25px;
    }
}

.tile.tile-512 .tile-inner {
    color: #f9f6f2;
    background: #edc850;
    box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0.39683), inset 0 0 0 1px rgba(255, 255, 255, 0.2381);
    font-size: 45px;
}

@media screen and (max-width: 520px) {
    .tile.tile-512 .tile-inner {
        font-size: 25px;
    }
}

.tile.tile-1024 .tile-inner {
    color: #f9f6f2;
    background: #edc53f;
    box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0.47619), inset 0 0 0 1px rgba(255, 255, 255, 0.28571);
    font-size: 35px;
}

@media screen and (max-width: 520px) {
    .tile.tile-1024 .tile-inner {
        font-size: 15px;
    }
}

.tile.tile-2048 .tile-inner {
    color: #f9f6f2;
    background: #edc22e;
    box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0.55556), inset 0 0 0 1px rgba(255, 255, 255, 0.33333);
    font-size: 35px;
}

@media screen and (max-width: 520px) {
    .tile.tile-2048 .tile-inner {
        font-size: 15px;
    }
}

.tile.tile-super .tile-inner {
    color: #f9f6f2;
    background: #3c3a32;
    font-size: 30px;
}

@media screen and (max-width: 520px) {
    .tile.tile-super .tile-inner {
        font-size: 10px;
    }
}

@-webkit-keyframes appear {
    0% {
        opacity: 0;
        -webkit-transform: scale(0);
        -moz-transform: scale(0);
        transform: scale(0);
    }
    100% {
        opacity: 1;
        -webkit-transform: scale(1);
        -moz-transform: scale(1);
        transform: scale(1);
    }
}

@-moz-keyframes appear {
    0% {
        opacity: 0;
        -webkit-transform: scale(0);
        -moz-transform: scale(0);
        transform: scale(0);
    }
    100% {
        opacity: 1;
        -webkit-transform: scale(1);
        -moz-transform: scale(1);
        transform: scale(1);
    }
}

@keyframes appear {
    0% {
        opacity: 0;
        -webkit-transform: scale(0);
        -moz-transform: scale(0);
        transform: scale(0);
    }
    100% {
        opacity: 1;
        -webkit-transform: scale(1);
        -moz-transform: scale(1);
        transform: scale(1);
    }
}

.tile-new .tile-inner {
    -webkit-animation: appear 200ms ease 100ms;
    -moz-animation: appear 200ms ease 100ms;
    animation: appear 200ms ease 100ms;
    -webkit-animation-fill-mode: backwards;
    -moz-animation-fill-mode: backwards;
    animation-fill-mode: backwards;
}

@-webkit-keyframes pop {
    0% {
        -webkit-transform: scale(0);
        -moz-transform: scale(0);
        transform: scale(0);
    }
    50% {
        -webkit-transform: scale(1.2);
        -moz-transform: scale(1.2);
        transform: scale(1.2);
    }
    100% {
        -webkit-transform: scale(1);
        -moz-transform: scale(1);
        transform: scale(1);
    }
}

@-moz-keyframes pop {
    0% {
        -webkit-transform: scale(0);
        -moz-transform: scale(0);
        transform: scale(0);
    }
    50% {
        -webkit-transform: scale(1.2);
        -moz-transform: scale(1.2);
        transform: scale(1.2);
    }
    100% {
        -webkit-transform: scale(1);
        -moz-transform: scale(1);
        transform: scale(1);
    }
}

@keyframes pop {
    0% {
        -webkit-transform: scale(0);
        -moz-transform: scale(0);
        transform: scale(0);
    }
    50% {
        -webkit-transform: scale(1.2);
        -moz-transform: scale(1.2);
        transform: scale(1.2);
    }
    100% {
        -webkit-transform: scale(1);
        -moz-transform: scale(1);
        transform: scale(1);
    }
}

.tile-merged .tile-inner {
    z-index: 20;
    -webkit-animation: pop 200ms ease 100ms;
    -moz-animation: pop 200ms ease 100ms;
    animation: pop 200ms ease 100ms;
    -webkit-animation-fill-mode: backwards;
    -moz-animation-fill-mode: backwards;
    animation-fill-mode: backwards;
}