:root {
    --tilesize: 40px;
    --mini-tile-size: calc(0.3 * var(--tilesize));
    --light-orange: #ffd787;
}

body {
    min-width: 530px;
    margin: 0;
}


header {
    background-color: var(--light-orange);
    padding: 1.3em 5%;
}

header > h1 {
    margin: 0;
    margin-bottom: 1rem;
    font-size: max(2em,4vw);
}

header > ul {
    font-size: 0;
    padding: 0;
    margin-bottom: 0;
}

header > ul > li {
    font-size: large;
    list-style-type: none;
    display: inline;
}
header > ul > li:not(:last-child):after {
    content: '|';
    margin: 0 1em;
}
header > ul > li:first-child:before {
    content: '|';
    margin: 0 1em 0 0;
}
header > ul > li:last-child:after {
    content: '|';
    margin: 0 0 0 1em;
}


main {
    margin: 1.5%;
    max-width: 800px;
}


#app {
    max-width: 800px;
    text-align: center;
}

.BoardWithControls {
    display: inline-block;
}

div.board {
    border: 1px solid black;
    display: inline-block;
    line-height: 0pt;
}

div.controls > button {
    font-size: 120%;
}
div.controls > button:not(:last-child) {
    margin-right: 0.3em;
}

div.row {
    display: block;
    white-space: nowrap;
}

div.tile {
    display: inline-block;
    width: var(--tilesize);
    height: var(--tilesize);
    margin: 1px;
    background-color: #cccccc;
    background-size: cover;
}

div.tile.invisible {
    background-color: transparent;
}

div.tile.obstacle {
    background-color: black;
}

div.tile.invalid {
    display: none;
}

div.tile.northsouth {
    background-image: url("line-north-south.svg")
}
div.tile.eastsouth {
    background-image: url("line-east-south.svg")
}
div.tile.northeast {
    background-image: url("line-north-east.svg")
}
div.tile.southwest {
    background-image: url("line-south-west.svg")
}
div.tile.eastwest {
    background-image: url("line-east-west.svg")
}
div.tile.northwest {
    background-image: url("line-north-west.svg")
}

div.tile.hintnorthsouth {
    background-image: url("line-hint-north-south.svg")
}
div.tile.hinteastsouth {
    background-image: url("line-hint-east-south.svg")
}
div.tile.hintnortheast {
    background-image: url("line-hint-north-east.svg")
}
div.tile.hintsouthwest {
    background-image: url("line-hint-south-west.svg")
}
div.tile.hinteastwest {
    background-image: url("line-hint-east-west.svg")
}
div.tile.hintnorthwest {
    background-image: url("line-hint-north-west.svg")
}

div.tile.current.northsouth {
    background-image: url("curline-north-south.svg")
}
div.tile.current.eastsouth {
    background-image: url("curline-east-south.svg")
}
div.tile.current.northeast {
    background-image: url("curline-north-east.svg")
}
div.tile.current.southwest {
    background-image: url("curline-south-west.svg")
}
div.tile.current.eastwest {
    background-image: url("curline-east-west.svg")
}
div.tile.current.northwest {
    background-image: url("curline-north-west.svg")
}

div.tile.solved.northsouth {
    background-image: url("solline-north-south.svg")
}
div.tile.solved.eastsouth {
    background-image: url("solline-east-south.svg")
}
div.tile.solved.northeast {
    background-image: url("solline-north-east.svg")
}
div.tile.solved.southwest {
    background-image: url("solline-south-west.svg")
}
div.tile.solved.eastwest {
    background-image: url("solline-east-west.svg")
}
div.tile.solved.northwest {
    background-image: url("solline-north-west.svg")
}

div.tile.arrowright {
    background-image: url("hint-arrow-right.svg")
}
div.tile.arrowleft {
    background-image: url("hint-arrow-left.svg")
}
div.tile.arrowup {
    background-image: url("hint-arrow-up.svg")
}
div.tile.arrowdown {
    background-image: url("hint-arrow-down.svg")
}


div.LevelChooser {
    margin: 1.5em 20%;
}
div.LevelChooser > p {
    font-size: 120%;
    margin-bottom: 0.5em;
}
div.MiniPreview {
    display: inline-block;
    margin: 10px;
}
.MiniPreview div.board {
    cursor: pointer;
    padding: calc(0.3 * var(--mini-tile-size));
}
.MiniPreview div.tile {
    width: var(--mini-tile-size);
    height: var(--mini-tile-size);
}
.MiniPreview div.tile.invisible {
    display: none;
}


div.caveat {
    font-size: 90%;
    color: gray;
}

.rules-list li:not(:last-child) {
    margin-bottom: 1.2em;
}
.rules-list img {
    display: block;
    margin-top: 0.3em;
}
.rules-list li > div {
    display: inline-block;
}


dl {
    margin-top: 0.7em;
    margin-bottom: 1.5em;
}
dt {
    font-weight: bolder;
}
dd {
    margin-bottom: 0.5em;
}

code.block {
    display: block;
    text-align: center;
    margin: 0.5em 0;
}