:root {
    --board-table-side-length: 90vmin;
    --long-short-ratio: 3.2;
    --short-length-number-in-board-table: calc(9 * var(--long-short-ratio) + 8);
    --short-length: calc(var(--board-table-side-length) / var(--short-length-number-in-board-table));
    --long-length: calc(var(--long-short-ratio) * var(--short-length));
    --wall-gap: calc(var(--short-length) * 0.25);
    --wall-length: calc(2 * var(--long-length) + var(--short-length) - 2 * var(--wall-gap));
    --wall-width: calc(var(--short-length) - 2 * var(--wall-gap));
    --font-size: 18px;
    --color-black: #232629;
}
/* size of iPad screen is 768px x 1024px in portrait mode */
@media only screen and (min-width: 768px) and (min-height: 768px) {
    :root {
        --font-size: 30px;
    }
}
@media only screen and (min-width: 768px), (orientation: landscape) {
    :root {
        --board-table-side-length: 70vmin;
    }
}
html {
    box-sizing: border-box;
}
*, *:before, *:after {
    box-sizing: inherit;
}
body {
    font-family: Arial, Helvetica, sans-serif;
    color: var(--color-black);
}
a,
a:link,
a:visited {
    color: #0074cc;
    text-decoration: none;
}
a:hover {
    color: #0a95ff;
}
a:active {
    color: #0a95ff;
}
.gridcontainer0 {
    display: grid;
    width: 100%;
    height: 100vh;
    justify-content: center;
    align-content: center;
    grid-template-rows: calc(3 * var(--font-size)) var(--board-table-side-length) calc(8 * var(--font-size));
    grid-template-columns: var(--board-table-side-length);
    grid-gap: 10px;
}
.gridcontainer1 {
    display: grid;
    justify-content: center;
    align-content: center;
    grid-template-rows: 1fr;
    grid-template-columns: 1fr 1fr 1fr 1fr 1fr;
}
.gridcontainer2 {
    display: grid;
    justify-content: center;
    align-content: center;
    grid-template-rows: 1fr 1fr;
    grid-template-columns: 1fr 1fr;
}
h1 {
    font-size: calc(1.2 * var(--font-size));
}
#board_table_container {
    position: relative;
    grid-row-start: 2;
}
table {
    table-layout: fixed;
    border-radius: 0.5%;            
    background-color: rgb(68, 117, 221);
    border-collapse: collapse;
    text-align: center;
    width: var(--board-table-side-length);
    height: var(--board-table-side-length);
    padding:0;
}
td {
    position: relative;
    padding: 0;
}
tr.row {
    height: var(--long-length);
}
td.col {
    width: var(--long-length);
}
tr.between_rows {
    height: var(--short-length);
}
td.between_cols {
    width: var(--short-length);
}
tr.row td.col {
    background-color: rgb(207, 207, 207);
    border-radius: 5%;
}
div.pawn {
    display: inline-block;
    width: calc(var(--long-length) * 0.7);
    height: calc(var(--long-length) * 0.7);
    border-radius: 50%;
    vertical-align: middle;
}
div.pawn.pawn0 {
    background-color: rgb(195, 164, 23);
}
div.pawn.pawn1 {
    background-color: rgb(51, 25, 25);
}
div.horizontal_wall, div.vertical_wall {
    display: inline-block;
    position: absolute;
    left: var(--wall-gap);
    top: var(--wall-gap);
    background-color: rgb(202, 168, 106);
}
div.horizontal_wall {
    width: var(--wall-length);
    height: var(--wall-width);
}
div.vertical_wall {
    width: var(--wall-width);
    height: var(--wall-length);
}
div.horizontal_wall.shadow, div.vertical_wall.shadow {
    opacity: 0.5;
}
div.pawn.shadow {
    opacity: 0.3;
}
#number_of_left_walls_box {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size);
    text-align: center;
    vertical-align: middle;
}
div.pawn.symbol {
    vertical-align: middle;
    width: var(--font-size);
    height: var(--font-size);
    margin-right: calc(var(--font-size) / 2);
}
div.pawn.button {
    margin-left: var(--short-length);
    margin-right: var(--short-length);
}
div.horizontal_wall.symbol {
    position: initial;
    vertical-align: middle;
    width: calc(var(--font-size) * (5 / 3));
    height: calc(var(--font-size) * (2 / 5));
    margin-left: calc(var(--font-size) / 6);
    margin-right: calc(var(--font-size) / 6);;
}
div.mul_sign_wall_num_container {
    display: inline-block;
    vertical-align: middle;
}
div.multiplication_sign {
    display: inline;
    vertical-align: middle;
    margin-left: calc(var(--font-size) / 6);;
    margin-right: calc(var(--font-size) / 6);;
}
div.wall_num {
    display: inline-block;
    vertical-align: middle;
    width: var(--font-size);
    text-align: center;
}
.fade_box {
    position: absolute;
    display: flex;
    flex-wrap: wrap;
    flex-direction: column;
    align-items: center;
    justify-content: space-evenly;
    top: calc((var(--board-table-side-length) - 9 * var(--long-length)) / 2);
    left: 0;
    width: var(--board-table-side-length);
    height: calc(9 * var(--long-length));
    font-size: var(--font-size);
    padding-left: var(--font-size);
    padding-right: var(--font-size);
    text-align: center;
    z-index: -1;
    visibility: hidden;
    opacity: 0;
}
.fade_box.in {
    z-index: 10;
    visibility: visible;
    opacity: 1;
    animation-name: fade_in;
    animation-duration: 1s;
}
.fade_box.in.about {
    justify-content: flex-start;
    top: 0;
    height: calc(3 *var(--board-table-side-length));
    overflow: visible;
    text-align: left;
}
@keyframes fade_in {
    0%   {opacity: 0;}
    100% {opacity: 1;}
}
.fade_box.inout {
    z-index: -1;
    visibility: hidden;
    opacity: 0;
    animation-name: fade_inout;
}
@keyframes fade_inout {
    0%   {visibility: visible; z-index: 10; opacity: 0;}
    25%  {opacity: 1;}
    75%  {opacity: 1;}
    100% {visibility: hidden; z-index: 10; opacity: 0;}
}
#about_box {
    background-color: rgba(255, 255, 255, 0.8);
}
#update_notification_message_box {
    background-color:rgba(226, 230, 36, 0.85);
}
#choose_ai_level_message_box, #choose_pawn_message_box, #restart_message_box, #game_result_message_box, button.restart {
    background-color:rgba(0, 81, 255, 0.85);
}
#note_message_box{
    background-color:rgba(255, 0, 0, 0.8);
    animation-duration: 3s;
}
#game_result_message_box{
    animation-duration: 10s;
}
.button_container.above.left, .button_container.below {
    grid-column: 1 / span 2;
    display: flex;
    align-items: center;
    justify-content: center;
}
.button_container.above.left {
    grid-column: 1 / span 3;
}
.button_container.above.right {
    grid-column-start: 5;
    display: flex;
    align-items: center;
    justify-content: flex-end;
}
button.button {
    display: inline-block;
    height: calc(3 * var(--font-size));
    width: 100%;
    border: none;
    border-radius: 10px;
    padding: 0;
    color: white;
    font-size: calc(var(--font-size) * 1.2);
    text-align: center;
    text-decoration: none;
    margin: 2%;
}
button.update, button.ai_level, button.close, button.restart_yes_no {
    display: inline-block;
    height: calc(2 * var(--font-size));
    width: calc(4 * var(--font-size));
    border: none;
    margin: 2px;
    padding: 0;
    background-color: white;
    color: var(--color-black);
    font-size: var(--font-size);
    text-align: center;
    text-decoration: none;
    border-radius: 10px;
}
button.update {
    height: calc(3 * var(--font-size));
    width: 100%;
}
button.close {
    background-color: rgb(50, 50, 50);
    color: white;
    display: block;
    margin: 0 auto;
}
.button.cancel {
    background-color: white;
    color: var(--color-black);
    border: 2px solid rgb(85, 85, 85);
}
.button.confirm {
    background-color: rgb(0, 71, 186);
}
.button.undo {
    background-color: rgb(36, 160, 112);
}
.button.redo {
    background-color: rgb(36, 131, 160);
}
.button.aido {
    background-color: rgb(36, 84, 160);
}
.button.about {
    background-color: rgb(50, 50, 50);
}
#message_box {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size);
    text-align: center;
    text-decoration: none;
}
#progress_bar {
    position: absolute;
    z-index: -1;
    top: 15%;
    left: 0;
    /*width: width is set on style property of progress_bar element;*/
    height: 70%;
    background-color: rgb(82, 153, 247);
}
span.no_wrap {
    white-space: nowrap;
}
span.thick {
    font-weight: 900;
}
div.pawn.hidden {
    visibility: hidden;
}
div.pawn.clicked {
    opacity: 0.7;
}
.fade_box.in.hidden, button.button.hidden, input.hidden {
    display: none;
}
.button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}
input {
    width: calc(3 * var(--font-size));
}
p.developed_by, p.release_date, p.last_updated {
    font-size: calc(0.6 * var(--font-size));
}
p.release_date, p.last_updated {
    margin-block-start: 0.4em;
    margin-block-end: 0.4em;
}
@media only screen and (min-width: 768px), (orientation: landscape) {
    .gridcontainer0 {
        grid-template-rows: calc(3 * var(--font-size)) var(--board-table-side-length);
        grid-template-columns: var(--board-table-side-length) calc(95vmin - var(--board-table-side-length));
    }
    .gridcontainer2 {
        display:grid;
        grid-row-start: 2;
        grid-column-start: 2;
        grid-template-columns: 1fr;
        grid-template-rows: calc(4 * var(--font-size)) calc(4 * var(--font-size)) 1fr;
    }
    .button_container.below {
        grid-column: unset;
        flex-direction: column-reverse;
        justify-content: flex-start;
    }
}
@media only screen and (min-width: 768px) and (min-height: 768px) {
    .fade_box {
        top: calc((var(--board-table-side-length) - 7 * var(--long-length)) / 2);
        left: 0;
        width: var(--board-table-side-length);
        height: calc(7 * var(--long-length));
    }
}
/* For iPhone 5&6 landscape */
@media only screen and (max-height: 375px) and (min-width: 568px) and (orientation:landscape) {
    .gridcontainer0 {
        grid-template-columns: var(--board-table-side-length) calc(105vmin - var(--board-table-side-length));
    }
}
@media (hover: hover) {
    #confirm_button, #cancel_button {
        display: none;
    }
    div.pawn.shadow:hover {
        opacity: 0.7;
    }
    div.pawn.button, button.ai_level, button.restart_yes_no, button.update {
        opacity: 0.9;
    }
    div.pawn.button:hover, button.ai_level:hover, button.restart_yes_no:hover, button.update:hover {
        opacity: 1;
    }
}
 
:root{--board-table-side-length:min(83vw,62vh,610px);--font-size:16px;--color-black:#172f38}
body{margin:0;min-height:100vh;background:radial-gradient(ellipse at top,#243e4b,#0b1722 75%);color:#e4edf1;font-family:system-ui,sans-serif}.brand{text-align:center;padding:22px 12px 8px}.brand span{display:block;color:#efca7d;letter-spacing:.35em;font-size:22px;font-weight:800}.brand small{display:block;color:#a6bbc7;margin-top:5px;font-size:13px}.gridcontainer0{height:auto;min-height:0;margin:10px auto 0;grid-template-rows:52px var(--board-table-side-length) 108px;gap:10px}.gridcontainer2{grid-template-rows:1fr 1fr}table{background:#3b6570;box-shadow:0 18px 50px #0007;outline:8px solid #253e49;border-radius:8px}tr.row td.col{background:linear-gradient(135deg,#dae3dd,#9db9b5);border-radius:8%}div.pawn.pawn0{background:radial-gradient(circle at 35% 30%,#fff2b7,#d0a33c 60%,#8f6420);box-shadow:0 2px 5px #0006}div.pawn.pawn1{background:radial-gradient(circle at 35% 30%,#a9b8cc,#39465c 60%,#101e30);box-shadow:0 2px 5px #0007}div.horizontal_wall,div.vertical_wall{background:#efaa65;box-shadow:0 1px 3px #0008}div.pawn.shadow{opacity:.5;cursor:pointer}button{cursor:pointer;font-family:inherit}button.button{font-size:14px;height:38px;border-radius:9px;margin:3px;font-weight:650}button.button.restart,.button.confirm{background:#b37b32}.button.undo{background:#346e61}.button.redo{background:#386478}.button.about{background:#334653}.fade_box.in{background:#e9efeb!important;color:#172f38;border:1px solid #a9c2bd;border-radius:14px;padding:18px;box-shadow:0 8px 24px #0005}.fade_box.in.about{height:100%;overflow:auto;justify-content:flex-start;line-height:1.5}.fade_box.in.about h1{font-size:32px;line-height:1.06;letter-spacing:-.045em;margin:8px 0 18px}.fade_box.in.about p{font-size:14px;margin:12px 0}.eyebrow{color:#4f756f;font-size:10px!important;font-weight:800;letter-spacing:.16em}.credit{font-size:11px!important;color:#52716c}button.close{width:100%;height:42px;background:#23594e;margin:20px 0 8px;font-size:16px;font-weight:700}.button:disabled{opacity:.35}#message_box{font-size:15px}#number_of_left_walls_box{flex-direction:row;gap:14px;font-size:16px}#progress_bar{width:0%;background:#8b6332;border-radius:7px}footer{text-align:center;color:#a6bbc7;font-size:12px;line-height:1.6;padding:8px 18px 20px}button:focus-visible,[role=button]:focus-visible{outline:3px solid #eba95a;outline-offset:3px}@media(max-width:520px){.brand{padding-top:15px}.fade_box.in.about h1{font-size:27px}.fade_box.in.about p{font-size:12px}.fade_box.in.about{padding:12px}.gridcontainer0{margin-top:6px}footer{font-size:11px}}