.heading:after {
    content: "";
    display: block;
    clear: both;
}

@-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 {
    flex-shrink: 0;
    float: right;
    text-align: right;
}

.score-container, .best-container {
    background: #b9d5d4;
    border: #7ad1d1 solid 1.5px;
    color: #000000;
    position: relative;
    display: inline-block;
    font-size: 20px;
    height: 25px;
    line-height: 47px;
    border-radius: 3px;
    text-align: center;
    margin-top: 0;
    padding: 15px 10px;
    min-width: 40px;
}

.heading {
    display: flex;
    margin-bottom: -10px;
}

@media (prefers-color-scheme: dark) {
    .score-container, .best-container {
        background: #0c2641;
        border: #1c538e solid 1.5px;
        color: #efefef;
    }
}

.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: #86817e;
}

.score-container .score-addition, .best-container .score-addition {
    position: absolute;
    right: 30px;
    font-size: 18px;
    line-height: 18px;
    color: #000000a9;
    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;
}

@media (prefers-color-scheme: dark) {
    .score-container .score-addition, .best-container .score-addition {
        color: #ffffffd0;
    }
}

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

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

.container {
    width: 280px;
    margin: 0 auto;
}

@-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;
    }
}

@-webkit-keyframes slide-up {
    0% {
        margin-top: 32%;
    }

    100% {
        margin-top: 20%;
    }
}

@-moz-keyframes slide-up {
    0% {
        margin-top: 32%;
    }

    100% {
        margin-top: 20%;
    }
}

@keyframes slide-up {
    0% {
        margin-top: 32%;
    }

    100% {
        margin-top: 20%;
    }
}

.game-container {
    margin-top: 17px;
    position: relative;
    padding: 10px;
    cursor: default;
    -webkit-touch-callout: none;
    -ms-touch-callout: none;
    user-select: none;
    -ms-touch-action: none;
    touch-action: none;
    background: #b6b0ab;
    border-radius: 6px;
    width: 280px;
    height: 280px;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
}

@media (prefers-color-scheme: dark) {
    .game-container {
        background: #113358;
        border: #194a7f solid 1.5px;
    }
}

.game-message {
    display: none;
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background: rgba(228, 222, 215, 0.6);
    border-radius: 5px;
    z-index: 100;
    padding-top: 40px;
    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;
}

@media (prefers-color-scheme: dark) {
    .game-message {
        background: rgba(33, 31, 31, 0.72);
    }
}

.game-message p {
    font-size: 30px;
    height: 30px;
    line-height: 30px;
}

.game-message .lower {
    display: block;
    margin-top: 20px;
}

.game-message .mailing-list {
    margin-top: 52px;
}

.game-message .mailing-list strong {
    display: block;
    margin-bottom: 10px;
}

.game-message .mailing-list .mailing-list-email-field {
    width: 230px;
    margin-right: 5px;
}

.game-message a {
    display: inline-block;
    background: #10919a;
    border: #0c464a solid 1.5px;
    border-radius: 3px;
    padding: 0 20px;
    text-decoration: none;
    color: #f9f6f2;
    height: 40px;
    line-height: 42px;
    cursor: pointer;
    margin-top: -5px;
}

@media (prefers-color-scheme: dark) {
    .game-message a {
        background: #0e3b6c;
        border: #1d60a7 solid 1.5px;
    }
}

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

.game-message .score-sharing {
    display: inline-block;
    vertical-align: middle;
    margin-left: 10px;
}

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

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

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

.game-message.game-won p, .game-message.game-over p {
    -webkit-animation: slide-up 1.5s ease-in-out 2500ms;
    -moz-animation: slide-up 1.5s ease-in-out 2500ms;
    animation: slide-up 1.5s ease-in-out 2500ms;
    -webkit-animation-fill-mode: both;
    -moz-animation-fill-mode: both;
    animation-fill-mode: both;
}

.game-message.game-won .mailing-list, .game-message.game-over .mailing-list {
    -webkit-animation: fade-in 1.5s ease-in-out 2500ms;
    -moz-animation: fade-in 1.5s ease-in-out 2500ms;
    animation: fade-in 1.5s ease-in-out 2500ms;
    -webkit-animation-fill-mode: both;
    -moz-animation-fill-mode: both;
    animation-fill-mode: both;
}

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

.grid-row {
    margin-bottom: 10px;
}

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

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

.grid-cell {
    width: 57.5px;
    height: 57.5px;
    margin-right: 10px;
    float: left;
    border-radius: 3px;
    background: rgba(238, 228, 218, 0.35);
}

@media (prefers-color-scheme: dark) {
    .grid-cell {
        background: rgba(92, 85, 85, 0.45);
    }
}

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

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

.tile, .tile .tile-inner {
    width: 58px;
    height: 58px;
    line-height: 67.5px;
}

.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, 67px);
    -moz-transform: translate(0px, 67px);
    transform: translate(0px, 67px);
}

.tile.tile-position-1-3 {
    -webkit-transform: translate(0px, 135px);
    -moz-transform: translate(0px, 135px);
    transform: translate(0px, 135px);
}

.tile.tile-position-1-4 {
    -webkit-transform: translate(0px, 202px);
    -moz-transform: translate(0px, 202px);
    transform: translate(0px, 202px);
}

.tile.tile-position-2-1 {
    -webkit-transform: translate(67px, 0px);
    -moz-transform: translate(67px, 0px);
    transform: translate(67px, 0px);
}

.tile.tile-position-2-2 {
    -webkit-transform: translate(67px, 67px);
    -moz-transform: translate(67px, 67px);
    transform: translate(67px, 67px);
}

.tile.tile-position-2-3 {
    -webkit-transform: translate(67px, 135px);
    -moz-transform: translate(67px, 135px);
    transform: translate(67px, 135px);
}

.tile.tile-position-2-4 {
    -webkit-transform: translate(67px, 202px);
    -moz-transform: translate(67px, 202px);
    transform: translate(67px, 202px);
}

.tile.tile-position-3-1 {
    -webkit-transform: translate(135px, 0px);
    -moz-transform: translate(135px, 0px);
    transform: translate(135px, 0px);
}

.tile.tile-position-3-2 {
    -webkit-transform: translate(135px, 67px);
    -moz-transform: translate(135px, 67px);
    transform: translate(135px, 67px);
}

.tile.tile-position-3-3 {
    -webkit-transform: translate(135px, 135px);
    -moz-transform: translate(135px, 135px);
    transform: translate(135px, 135px);
}

.tile.tile-position-3-4 {
    -webkit-transform: translate(135px, 202px);
    -moz-transform: translate(135px, 202px);
    transform: translate(135px, 202px);
}

.tile.tile-position-4-1 {
    -webkit-transform: translate(202px, 0px);
    -moz-transform: translate(202px, 0px);
    transform: translate(202px, 0px);
}

.tile.tile-position-4-2 {
    -webkit-transform: translate(202px, 67px);
    -moz-transform: translate(202px, 67px);
    transform: translate(202px, 67px);
}

.tile.tile-position-4-3 {
    -webkit-transform: translate(202px, 135px);
    -moz-transform: translate(202px, 135px);
    transform: translate(202px, 135px);
}

.tile.tile-position-4-4 {
    -webkit-transform: translate(202px, 202px);
    -moz-transform: translate(202px, 202px);
    transform: translate(202px, 202px);
}

.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;
    z-index: 10;
    font-size: 25px;
}

.tile-inner {
    display: flex;
    align-items: center;
    justify-content: center;
}

.tile.tile-2 .tile-inner {
    color: #776e65;
    background: #eee4da;
    box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0), inset 0 0 0 1px rgba(255, 255, 255, 0);
}

@media (prefers-color-scheme: dark) {
    .tile.tile-2 .tile-inner {
        color: #e8e6e4;
        background: #3181b6;
    }
}

.tile.tile-4 .tile-inner {
    color: #776e65;
    background: #ede0c8;
    box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0), inset 0 0 0 1px rgba(255, 255, 255, 0);
}

@media (prefers-color-scheme: dark) {
    .tile.tile-4 .tile-inner {
        color: #f5f2ee;
        background: #52699f;
    }
}

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

@media (prefers-color-scheme: dark) {
    .tile.tile-8 .tile-inner {
        color: #f9f6f2;
        background: #3c609e;
    }
}

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

@media (prefers-color-scheme: dark) {
    .tile.tile-16 .tile-inner {
        color: #f9f6f2;
        background: #324c8f;
    }
}

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

@media (prefers-color-scheme: dark) {
    .tile.tile-32 .tile-inner {
        color: #f9f6f2;
        background: #34418e;
    }
}

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

@media (prefers-color-scheme: dark) {
    .tile.tile-64 .tile-inner {
        color: #f9f6f2;
        background: #1a6b60;
    }
}
    
.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: 20px;
}

@media (prefers-color-scheme: dark) {
    .tile.tile-128 .tile-inner {
        color: #f9f6f2;
        background: #bc9727;
    }
}

.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: 20px;
}

@media (prefers-color-scheme: dark) {
    .tile.tile-256 .tile-inner {
        color: #f9f6f2;
        background: #d0a420;
    }
}
 
.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: 20px;
}

@media (prefers-color-scheme: dark) {
    .tile.tile-512 .tile-inner {
        color: #f9f6f2;
        background: #c0a125;
    }
}
 
.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: 18px;
}
 
.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: 18px;
}

.tile.tile-super .tile-inner {
    color: #f9f6f2;
    background: #3c3a32;
    font-size: 18px;
}

@-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;
}

.game-intro {
    float: left;
    line-height: 42px;
    margin-bottom: 0;
}

.restart-button {
    flex-grow: 1;
    margin-right: 5px;
    background: #11bbbb;
    border: #545454 solid 1.5px;
    border-radius: 3px;
    color: #000000;
    height: 58px;
    line-height: 48px;
    cursor: pointer;
    text-align: center;
}

@media (prefers-color-scheme: dark) {
    .restart-button {
        background: #0f2f50;
        border: #194a7e solid 1.5px;
        color: #efefef;
    }
}