:root {
  --base-color: white;
  --background-color: black;
  --highlight-color: greenyellow;
  --highlight-negative-color: red;
  --highlight-subtle-color: grey;
  --highlight-subtle-light-color: lightgrey;
  --highlight-info-color: cyan;
  --highlight-info-light-color: lightblue;
  --maze-path-color: grey;
  --player-color: var(--base-color);
  --artifact-color: yellow;
}

body {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  background-color: var(--background-color);
  color: var(--base-color);
  font-family: 'Silkscreen', Courier, monospace;
  touch-action: manipulation;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

:focus-visible {
  outline: 2px solid var(--highlight-color);
  outline-offset: 2px;
}

.container {
  display: flex;
  flex-direction: column;
  width: 100%;
}

.container > * {
  margin: 1em;
}

dialog::backdrop {
  background-color: black;
  touch-action: manipulation;
}

/* Site Info Header */

h1 {
  align-self: center;
  font-size: xx-large;
  font-weight: 36pt;
}

header > p {
  flex: 1;
}

em {
  color: var(--highlight-color);
}

#settings-button {
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: var(--base-color);
  color: var(--background-color);
  border: 0px;
  width: 30px;
  height: 30px;
  padding: 0;
  border-radius: 50%;
}

#settings-button:hover, #settings-button:focus-visible   {
  background-color: var(--highlight-color);
  scale: 1.1;
  cursor: pointer;
}

header {
  border-bottom: 1px solid var(--base-color);
  display: flex;
  flex-direction: row;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  gap: 1em;
  padding: 1em;
  box-sizing: border-box;
}

@media (max-width: 576px) {
  header {
    flex-direction: column;
    align-items: start;
    padding: 0.5em 1em;
  }

  header > p {
    display: none;
  }

  h1 {
    font-size: large;
  }

  html, body {
    height: 100%;
  }

  body {
    height: 100dvh;
    overflow: hidden;
  }

  #centerpiece {
    flex: 1;
    min-height: 0;
    justify-content: space-between;
  }

  #centerpiece.container > * {
    margin: 0.5em;
  }

  #play-space {
    max-width: 90vw;
    max-height: none;
    flex: 1;
    min-height: 0;
  }

  #time-content, #controls {
    flex: 0 0 auto;
  }

  footer {
    margin: 0.5em;
    font-size: smaller;
  }
}

form.container {
  align-items: center;
}

dialog {
  background-color: var(--background-color);
  color: var(--base-color);
  font-family: 'Silkscreen', Courier, monospace;
  position: fixed;
  touch-action: manipulation;
}

dialog h2 {
  font-size: x-large;
  align-self: center;
}

#settings-dialog > form {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

#settings-dialog > form > h2 {
  grid-column: 1 / 3;
  justify-self: center;
}

#settings-dialog > form > .form-line {
  grid-column: 1 / 3;
  justify-self: center;
  display: flex;
  justify-content: space-between;
  gap: 2em;
}

button {
  background-color: var(--background-color);
  color: var(--base-color);
  font-family: 'Silkscreen', Courier, monospace;
  border-color: var(--base-color);
  width: fit-content;
}

button[value="confirm"]:hover, button[value="confirm"]:focus-visible {
  background-color: var(--highlight-color);
  color: black;
  border-color: var(--highlight-color);
  cursor: pointer;
}

button[value="cancel"]:hover, button[value="cancel"]:focus-visible {
  background-color: var(--highlight-negative-color);
  color: black;
  border-color: var(--highlight-negative-color);
}

/* --- Game Area --- */

/* Timer  */

#time-value {
  font-size: larger;
  font-weight: bold;
}

#time-progress {
  background-color: var(--highlight-color);
  width: 95%; /* TODO adjust to dynamic */
  height: 1em;
}

/* Play Space */

#centerpiece {
  display: flex;
  flex-direction: column;
  width: 100%;
  align-items: center;
}

/* Hide all page chrome until a game is actually running, so nothing
   flashes into view before the settings modal opens on load. */
header, #centerpiece, #controls, footer {
  visibility: hidden;
}

body.game-active header,
body.game-active #centerpiece,
body.game-active #controls,
body.game-active footer {
  visibility: visible;
}

#play-space {
  max-width: 80vw;
  max-height: 60vh;
  overflow: hidden;
  border: 1px solid white;
  overscroll-behavior: contain;
  position: relative;
  z-index: 1;
}

#maze-grid {
  margin: 0;
  display: grid;
  grid-template-rows: repeat(5, 1fr);
  grid-template-columns: repeat(5, 1fr);
}

.maze-tile {
  width: 50px; /* TODO adjust to dynamic */
  height: 50px; /* TODO adjust to dynamic */
  box-sizing: border-box;
}

.maze-path {
  background-color: var(--maze-path-color);
}

.artifact, .maze-path {
  opacity: 0;
}

.maze-path.seen {
  opacity: 0.5;
}

.visible {
  opacity: 1 !important;
}

#player > svg {
  width: 30px; /* TODO adjust to dynamic */
  height: 30px; /* TODO adjust to dynamic */
  fill: var(--player-color);
  margin: 0;
  padding: 0;
}

.artifact > svg {
  width: 10px; /* TODO adjust to dynamic */
  height: 10px; /* TODO adjust to dynamic */
  fill: var(--artifact-color);
  margin: 0;
  padding: 0;
}

.tile-object {
  position: absolute;
  margin: 0;
  z-index: 0;
}

.end-tile {
  animation: pulse 1s ease-in-out 0s infinite alternate;
}

@keyframes pulse {
  from {
    background-color: var(--highlight-subtle-light-color);
  }

  to {
    background-color: var(--highlight-color);
  }
}

@media (prefers-reduced-motion: reduce) {
  .end-tile {
    animation: none;
    background-color: var(--highlight-color);
  }
}

/* Controls */

#controls {
  display: grid;
  grid-template-rows: repeat(5, 1fr);
  grid-template-columns: 3fr 1fr 1fr 1fr 3fr;
  gap: 1ex;
  place-items: center
}

#controls > span {
  font-size: smaller;
  font-weight: lighter;
}

#up-label {
  grid-row-start: 1;
  grid-column: 2 / 5;
}

#up {
  grid-row-start: 2;
  grid-column-start: 3;
}

#left-label {
  grid-row-start: 3;
  grid-column-start: 1;
}

#left {
  grid-row-start: 3;
  grid-column-start: 2;
}

#right {
  grid-row-start: 3;
  grid-column-start: 4;
}

#right-label {
  grid-row-start: 3;
  grid-column-start: 5;
}

#down {
  grid-row-start: 4;
  grid-column-start: 3;
}

#down-label {
  grid-row-start: 5;
  grid-column: 2 / 5;
}

.key-symbol {
  background-color: var(--highlight-subtle-color);
  color: var(--base-color);
  border: 2px outset var(--base-color);
  width: 1.2em;
  height: 1em;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 1ex;
  font-family: 'Silkscreen', Courier, monospace;
  font-size: larger;
}

.key-symbol:hover, .key-symbol:focus-visible {
  background-color: var(--highlight-subtle-light-color);
}

.key-symbol.pressed {
  background-color: var(--base-color);
  color: black;
  border: 2px inset var(--base-color);
}

/* Footer */

footer {
  font-weight: 12pt;
  margin: 2em;
}

a#website-link {
  color: var(--highlight-info-light-color);
  text-decoration: none;
}

a#website-link:hover {
  color: var(--highlight-info-color);
  text-decoration: underline;
}