:root {
  --fg: #111111;
  --bg: #ffffff;
  --muted: #3d3d3d;
  --soft: #f2f2f2;
  --link: #0b4fb3;
  --focus: #0b57d0;
  --focus-ring: #ffffff;
  --cue-fg: #ffffff;
  --cue-jump: #0b4fb3;
  --cue-duck: #8a3b00;
  --cue-clear: #3d3d3d;
}

@media (prefers-color-scheme: dark) {
  :root[data-theme="standard"] {
    --fg: #ffffff;
    --bg: #000000;
    --muted: #d6d6d6;
    --soft: #161616;
    --link: #8cc2ff;
    --focus: #ffd400;
    --focus-ring: #000000;
    --cue-fg: #000000;
    --cue-jump: #8cc2ff;
    --cue-duck: #ffb37a;
    --cue-clear: #d6d6d6;
  }
}

:root[data-theme="black-on-white"] {
  --fg: #000000;
  --bg: #ffffff;
  --muted: #000000;
  --soft: #ffffff;
  --link: #000000;
  --focus: #000000;
  --focus-ring: #ffffff;
  --cue-fg: #ffffff;
  --cue-jump: #000000;
  --cue-duck: #000000;
  --cue-clear: #000000;
}

:root[data-theme="white-on-black"] {
  --fg: #ffffff;
  --bg: #000000;
  --muted: #ffffff;
  --soft: #000000;
  --link: #ffffff;
  --focus: #ffffff;
  --focus-ring: #000000;
  --cue-fg: #000000;
  --cue-jump: #ffffff;
  --cue-duck: #ffffff;
  --cue-clear: #ffffff;
}

:root[data-theme="yellow-on-black"] {
  --fg: #ffee00;
  --bg: #000000;
  --muted: #ffee00;
  --soft: #000000;
  --link: #ffee00;
  --focus: #ffee00;
  --focus-ring: #000000;
  --cue-fg: #000000;
  --cue-jump: #ffee00;
  --cue-duck: #ffee00;
  --cue-clear: #ffee00;
}

html body {
  font-size: 1.15rem;
  line-height: 1.55;
  margin: 0;
}

:root:not([data-theme="standard"]) body,
:root:not([data-theme="standard"]) .description,
:root:not([data-theme="standard"]) .panel {
  background: var(--bg) !important;
  color: var(--fg) !important;
}

:root:not([data-theme="standard"]) .main-menu a,
:root:not([data-theme="standard"]) .description a {
  color: var(--fg) !important;
}

:root:not([data-theme="standard"]) .main-menu .divider::after {
  background-color: var(--fg) !important;
}

:root[data-theme="black-on-white"] .logo {
  background-image: url(../img/logo-light.svg) !important;
}

:root[data-theme="white-on-black"] .logo,
:root[data-theme="yellow-on-black"] .logo {
  background-image: url(../img/logo-dark.svg) !important;
}

:root:not([data-theme="standard"]) .panel,
:root:not([data-theme="standard"]) .description {
  border: 2px solid var(--fg) !important;
  box-shadow: none !important;
}

a {
  color: var(--link);
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

.site-head {
  max-width: 1100px;
  margin: 0 auto;
  padding: 12px 16px 0;
}

.main-menu {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 4px 0;
  padding-top: 8px;
}

.main-menu a {
  display: inline-block;
  padding: 8px 4px;
}

.page-title {
  margin: 18px 0 8px;
  text-align: center;
  font-size: clamp(1.6rem, 3.2vw, 2.4rem);
  font-weight: 700;
  line-height: 1.2;
}

.lead {
  max-width: 46em;
  margin: 0 auto 4px;
  text-align: center;
}

main#game.panel {
  max-width: 1100px;
  margin: 16px auto;
  padding: 16px;
  border-radius: 14px;
}

.score-bar {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 12px;
  margin: 4px 0 10px;
}

.score {
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(1.3rem, 3vw, 2rem);
  line-height: 1.1;
}

.score small {
  display: block;
  font-size: 0.55em;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.score-best {
  text-align: right;
}

.cue {
  min-width: 7.5em;
  min-height: 1.9em;
  padding: 0.2em 0.6em;
  border-radius: 12px;
  font-size: clamp(1.4rem, 3.4vw, 2.2rem);
  font-weight: 800;
  line-height: 1.5;
  text-align: center;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--cue-fg);
  background: var(--cue-jump);
  opacity: 0;
  transform: scale(0.92);
  transition: opacity 0.12s ease-out, transform 0.12s ease-out;
}

.cue.is-on {
  opacity: 1;
  transform: none;
}

.cue.is-pulse {
  animation: cue-pulse 0.28s ease-out;
}

@keyframes cue-pulse {
  0% {
    transform: scale(1.18);
  }
  100% {
    transform: scale(1);
  }
}

.cue[data-kind="jump"]::before {
  content: "▲ ";
}

.cue[data-kind="duck"] {
  background: var(--cue-duck);
}

.cue[data-kind="duck"]::before {
  content: "▼ ";
}

.cue[data-kind="clear"] {
  background: var(--cue-clear);
}

.game-state {
  margin: 0 0 10px;
  font-weight: 600;
}

.trex-stage {
  --z: 1;
  box-sizing: content-box;
  position: relative;
  overflow: hidden;
  height: calc(150px * var(--z));
  border: 2px solid var(--fg);
  border-radius: 10px;
  background: var(--bg);
}

.trex-stage:focus-within {
  outline: 4px solid var(--focus);
  outline-offset: 3px;
  box-shadow: 0 0 0 3px var(--focus-ring);
}

.trex-stage .trex-game {
  width: calc(100% / var(--z));
  min-height: 150px;
  transform: scale(var(--z));
  transform-origin: 0 0;
}

.trex-stage .runner-container {
  outline: none;
}

.trex-stage .runner-canvas {
  image-rendering: pixelated;
}

@media all and (min-width: 1921px) {
  html .trex-stage .runner-canvas {
    width: var(--cw, 100%) !important;
    height: 150px !important;
  }
}

:root[data-theme="black-on-white"] .trex-stage .runner-canvas {
  filter: grayscale(1) contrast(4) !important;
}

:root[data-theme="white-on-black"] .trex-stage .runner-canvas {
  filter: invert(1) grayscale(1) contrast(4) !important;
}

:root[data-theme="yellow-on-black"] .trex-stage .runner-canvas {
  filter: invert(1) grayscale(1) contrast(4) sepia(1) saturate(30) !important;
}

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

.touch-pad {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 12px;
  margin-top: 12px;
}

.btn-big,
.play-row button {
  min-height: 52px;
  padding: 10px 18px;
  font: inherit;
  font-weight: 700;
  color: var(--fg);
  background: var(--bg);
  border: 2px solid var(--fg);
  border-radius: 12px;
  cursor: pointer;
}

.btn-big {
  min-height: 76px;
  font-size: 1.45rem;
  white-space: nowrap;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-touch-callout: none;
}

.btn-big.is-pressed,
.btn-big:active {
  color: var(--bg);
  background: var(--fg);
}

.play-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 12px;
}

.play-row button:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

#btn-start {
  color: var(--bg);
  background: var(--fg);
}

button:focus-visible,
.chip input:focus-visible + span,
.check input:focus-visible,
select:focus-visible,
input[type="range"]:focus-visible,
.main-menu a:focus-visible,
.description a:focus-visible {
  outline: 4px solid var(--focus);
  outline-offset: 3px;
  box-shadow: 0 0 0 3px var(--focus-ring);
}

.settings {
  margin-top: 18px;
  border: 2px solid var(--fg);
  border-radius: 12px;
}

.settings > summary {
  padding: 12px 16px;
  font-size: 1.2rem;
  font-weight: 700;
  cursor: pointer;
}

.settings > summary:focus-visible {
  outline: 4px solid var(--focus);
  outline-offset: -4px;
}

.settings-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 18px 28px;
  padding: 4px 16px 18px;
}

.opt {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.opt legend,
.opt .opt-label {
  display: block;
  margin-bottom: 8px;
  font-size: 1.05rem;
  font-weight: 700;
}

.opt .hint {
  margin: 6px 0 0;
  font-size: 0.95rem;
  color: var(--muted);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  position: relative;
  margin: 0;
}

.chip input {
  position: absolute;
  opacity: 0;
  width: 1px;
  height: 1px;
}

.chip span {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 0 16px;
  font-weight: 600;
  border: 2px solid var(--fg);
  border-radius: 999px;
  cursor: pointer;
}

.chip input:checked + span {
  color: var(--bg);
  background: var(--fg);
}

.chip input:checked + span::before {
  content: "✓\00a0";
}

.chip input:disabled + span {
  opacity: 0.35;
  cursor: not-allowed;
  text-decoration: line-through;
}

.check {
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 48px;
  margin: 0;
  font-weight: 600;
  cursor: pointer;
}

.check input {
  flex: none;
  width: 28px;
  height: 28px;
  margin: 0;
  accent-color: var(--fg);
}

.opt select {
  width: 100%;
  min-height: 48px;
  padding: 0 12px;
  font: inherit;
  color: var(--fg);
  background: var(--bg);
  border: 2px solid var(--fg);
  border-radius: 10px;
}

.opt input[type="range"] {
  width: 100%;
  height: 36px;
  accent-color: var(--fg);
}

.keys {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 6px 16px;
  margin: 18px 0 0;
}

.keys dt {
  font-weight: 700;
}

.keys dd {
  margin: 0;
}

kbd {
  display: inline-block;
  min-width: 1.8em;
  padding: 0 0.4em;
  font: inherit;
  font-weight: 700;
  text-align: center;
  color: var(--fg);
  background: var(--soft);
  border: 2px solid var(--fg);
  border-radius: 6px;
}

.description {
  max-width: 1100px;
  margin: 28px auto 40px !important;
}

.description h2 {
  margin: 0 0 14px;
  font-size: 1.7rem;
  text-align: center;
}

.description h3 {
  margin: 30px 0 10px;
  font-size: 1.3rem;
}

.description p,
.description li {
  max-width: 44em;
}

.description figure {
  margin: 18px 0 22px;
}

.description figure img {
  display: block;
  width: 100%;
  max-width: 980px;
  height: auto;
  border: 2px solid var(--fg);
  border-radius: 10px;
}

.description .fig-phone {
  text-align: center;
}

.description .fig-phone img {
  max-width: 360px;
  margin: 0 auto;
}

.description figcaption {
  margin-top: 8px;
  font-size: 0.95rem;
  color: var(--muted);
}

@media (max-width: 640px) {
  main#game.panel {
    padding: 12px;
    border-radius: 0;
    border-left: 0 !important;
    border-right: 0 !important;
  }

  .lead {
    font-size: 1rem;
  }

  .score-bar {
    gap: 8px;
  }

  .cue {
    min-width: 5.6em;
    font-size: 1.3rem;
  }

  .play-row button {
    flex: 1 1 30%;
  }

  .touch-pad {
    grid-template-columns: 3fr 2fr;
  }

  .btn-big {
    font-size: 1.25rem;
  }

  .settings-grid {
    grid-template-columns: 1fr;
    padding: 4px 12px 16px;
  }

  .keys {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .keys dd {
    margin-bottom: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .cue,
  .cue.is-pulse {
    transition: none;
    transform: none;
    animation: none;
  }
}

@media (forced-colors: active) {
  .chip input:checked + span {
    forced-color-adjust: none;
    color: HighlightText;
    background: Highlight;
  }

  .cue {
    forced-color-adjust: none;
    color: HighlightText;
    background: Highlight;
  }

  .trex-stage .runner-canvas {
    forced-color-adjust: none;
  }
}

.a11y-langs {
  max-width: 1100px;
  margin: 0 auto 32px;
}

.a11y-langs ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.a11y-langs a {
  display: inline-block;
  padding: 6px 2px;
}

.a11y-langs a[aria-current="page"] {
  font-weight: 700;
  text-decoration: none;
}