/* ===========================================================================
   Snake — stylesheet
   ---------------------------------------------------------------------------
   Every selector below starts with #snake-game (or .snake-demo-page, which is
   only for the standalone index.html). Nothing here can leak into a host page,
   and the high specificity of an id selector means a host page's own .button
   or .menu rules cannot leak in either.

   Re-theming: change the custom properties in the first block. The canvas has
   its own matching palette in js/config.js → SnakeGame.THEME.
   =========================================================================== */

#snake-game {

  /* palette */
  --snake-ink: #0f1722;
  --snake-ink-deep: #0b121c;
  --snake-panel: rgba(14, 22, 33, 0.94);
  --snake-panel-soft: rgba(233, 226, 208, 0.05);
  --snake-parchment: #e9e2d0;
  --snake-parchment-dim: rgba(233, 226, 208, 0.62);
  --snake-parchment-faint: rgba(233, 226, 208, 0.38);
  --snake-brass: #c89b3c;
  --snake-jade: #63c79b;
  --snake-violet: #9a7bd1;
  --snake-oxblood: #c05252;
  --snake-line: rgba(233, 226, 208, 0.14);

  /* type */
  --snake-font-ui: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --snake-font-mono: ui-monospace, "IBM Plex Mono", SFMono-Regular, Menlo, Consolas, monospace;
  --snake-font-display: "Fraunces", "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;

  /* metrics */
  --snake-stage-size: min(820px, 82vh, 80vw);
  --snake-aspect: 1;
  --snake-radius: 12px;
  --snake-gap: 0.6rem;

  display: block;
  font-family: var(--snake-font-ui);
  font-size: 16px;
  line-height: 1.5;
  color: var(--snake-parchment);
  text-align: left;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}

#snake-game,
#snake-game *,
#snake-game *::before,
#snake-game *::after {
  box-sizing: border-box;
}

#snake-game h2,
#snake-game h3,
#snake-game h4,
#snake-game p,
#snake-game ul,
#snake-game ol,
#snake-game dl,
#snake-game dd,
#snake-game dt,
#snake-game figure {
  margin: 0;
  padding: 0;
}

#snake-game ul,
#snake-game ol {
  list-style: none;
}

#snake-game button {
  font: inherit;
  color: inherit;
}


/* --------------------------------- frame --------------------------------- */

#snake-game .snake-game__frame {
  width: min(100%, var(--snake-stage-size));
  margin-inline: auto;
  display: flex;
  flex-direction: column;
  gap: var(--snake-gap);
  min-height: 0;
}


/* ---------------------------------- HUD ---------------------------------- */

#snake-game .snake-game__hud {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0;
  padding: 0.45rem 0.7rem;
  background: var(--snake-panel-soft);
  border: 1px solid var(--snake-line);
  border-radius: var(--snake-radius);
}

#snake-game .snake-hud__item {
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
  padding: 0 0.7rem;
  min-width: 0;
}

#snake-game .snake-hud__item + .snake-hud__item {
  border-left: 1px solid var(--snake-line);
}

#snake-game .snake-hud__item:first-child {
  padding-left: 0.1rem;
}

#snake-game .snake-hud__label {
  font-family: var(--snake-font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  color: var(--snake-parchment-faint);
}

#snake-game .snake-hud__value {
  font-family: var(--snake-font-mono);
  font-size: 1.05rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.01em;
}

#snake-game .snake-hud__item[data-hud-item="time"] .snake-hud__value {
  color: var(--snake-brass);
}

#snake-game .snake-hud__effects {
  margin-left: auto;
  display: flex;
  gap: 0.35rem;
  padding-left: 0.5rem;
}

#snake-game .snake-chip {
  font-family: var(--snake-font-mono);
  font-size: 0.68rem;
  padding: 0.15rem 0.45rem;
  border-radius: 999px;
  border: 1px solid currentColor;
  white-space: nowrap;
}

#snake-game .snake-chip--slow {
  color: var(--snake-violet);
}

#snake-game .snake-chip--double {
  color: var(--snake-brass);
}


/* --------------------------------- stage --------------------------------- */

#snake-game .snake-game__stage {
  position: relative;
  width: 100%;
  aspect-ratio: var(--snake-aspect);
  min-height: 0;
  border-radius: var(--snake-radius);
  overflow: hidden;
  background: var(--snake-ink-deep);
  border: 1px solid var(--snake-line);
  display: flex;
  align-items: center;
  justify-content: center;
}

@supports not (aspect-ratio: 1 / 1) {
  #snake-game .snake-game__stage {
    height: 0;
    padding-bottom: 100%;
  }
}

#snake-game .snake-game__canvas {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  max-height: 100%;
  touch-action: none;
}

#snake-game .snake-game__sr {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}


/* -------------------------------- overlay -------------------------------- */

#snake-game .snake-game__overlay {
  position: absolute;
  inset: 0;
  touch-action: auto;
  display: flex;
  align-items: stretch;
  justify-content: center;
  padding: 0.9rem;
  overflow: hidden;
}

#snake-game .snake-game__overlay[hidden] {
  display: none;
}

#snake-game .snake-screen {
  width: 100%;
  height: 100%;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

#snake-game .snake-screen[hidden] {
  display: none;
}

#snake-game .snake-screen__panel {
  width: min(100%, 27rem);
  max-height: 100%;
  min-height: 0;
  overflow-y: auto;
  overflow-x: hidden;
  overscroll-behavior: contain;
  padding: 1.35rem 1.4rem 1.45rem;
  background: var(--snake-panel);
  border: 1px solid var(--snake-line);
  border-radius: var(--snake-radius);
  box-shadow: 0 18px 40px rgba(5, 9, 14, 0.55);
  animation: snake-panel-in 160ms ease-out;
  scrollbar-width: thin;
  scrollbar-color: var(--snake-brass) transparent;
}

#snake-game .snake-screen__panel::-webkit-scrollbar {
  width: 6px;
}

#snake-game .snake-screen__panel::-webkit-scrollbar-track {
  background: transparent;
}

#snake-game .snake-screen__panel::-webkit-scrollbar-thumb {
  background: var(--snake-brass);
  border-radius: 999px;
}

#snake-game .snake-screen__panel--menu {
  text-align: center;
  padding-block: 1.9rem 1.6rem;
}

#snake-game .snake-screen__panel--compact {
  text-align: center;
}

#snake-game .snake-screen__panel--wide {
  width: min(100%, 31rem);
}

@keyframes snake-panel-in {
  from {
    opacity: 0;
    transform: translateY(6px) scale(0.985);
  }

  to {
    opacity: 1;
    transform: none;
  }
}


/* --------------------------------- titles -------------------------------- */

#snake-game .snake-title {
  font-family: var(--snake-font-display);
  font-weight: 600;
  font-size: clamp(2.1rem, 11vw, 3.1rem);
  line-height: 1;
  letter-spacing: 0.3em;
  text-indent: 0.3em;
  color: var(--snake-parchment);
}

#snake-game .snake-subtitle {
  margin-top: 0.75rem;
  font-family: var(--snake-font-mono);
  font-size: 0.78rem;
  color: var(--snake-parchment-dim);
}

#snake-game .snake-screen__title {
  font-family: var(--snake-font-display);
  font-weight: 600;
  font-size: 1.5rem;
  letter-spacing: 0.02em;
  margin-bottom: 0.9rem;
}

#snake-game .snake-screen__note {
  font-family: var(--snake-font-mono);
  font-size: 0.75rem;
  color: var(--snake-parchment-dim);
  margin-bottom: 1rem;
}

#snake-game .snake-screen__foot {
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
  margin-top: 1.1rem;
}


/* -------------------------------- buttons -------------------------------- */

#snake-game .snake-game__button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.62em 1.1em;
  font-family: var(--snake-font-ui);
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--snake-parchment);
  background: var(--snake-panel-soft);
  border: 1px solid var(--snake-line);
  border-radius: 9px;
  cursor: pointer;
  transition:
    background 140ms ease,
    border-color 140ms ease,
    transform 90ms ease;
}

#snake-game .snake-game__button:hover {
  background: rgba(233, 226, 208, 0.11);
  border-color: rgba(200, 155, 60, 0.45);
}

#snake-game .snake-game__button:active {
  transform: translateY(1px);
}

#snake-game .snake-game__button:focus-visible {
  outline: 2px solid var(--snake-brass);
  outline-offset: 2px;
}

#snake-game .snake-game__button--primary {
  background: var(--snake-jade);
  border-color: transparent;
  color: #08121b;
  font-weight: 600;
}

#snake-game .snake-game__button--primary:hover {
  background: #7fd8a8;
  border-color: transparent;
}

#snake-game .snake-game__button--ghost {
  background: transparent;
  font-size: 0.82rem;
  padding: 0.5em 0.9em;
}

#snake-game .snake-game__button--small {
  font-size: 0.78rem;
  padding: 0.45em 0.8em;
}

#snake-game .snake-game__button--quiet {
  background: transparent;
  border-color: transparent;
  color: var(--snake-parchment-faint);
  font-size: 0.78rem;
}

#snake-game .snake-game__button--quiet:hover {
  color: var(--snake-oxblood);
  background: transparent;
  border-color: transparent;
}


/* --------------------------------- menu ---------------------------------- */

#snake-game .snake-menu {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  margin-top: 1.5rem;
}

#snake-game .snake-menu__status {
  margin-top: 1.1rem;
  font-family: var(--snake-font-mono);
  font-size: 0.72rem;
  color: var(--snake-parchment-faint);
}


/* ----------------------------- player form ------------------------------ */

#snake-game .snake-player-form {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  margin-top: 1rem;
  text-align: left;
}

#snake-game .snake-player-form__label {
  margin-top: 0.25rem;
  font-family: var(--snake-font-ui);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--snake-parchment-dim);
}

#snake-game .snake-player-form__input {
  width: 100%;
  box-sizing: border-box;
  padding: 0.7rem 0.8rem;
  font-family: var(--snake-font-ui);
  font-size: 0.9rem;
  line-height: 1.3;
  color: var(--snake-parchment);
  background: var(--snake-panel-soft);
  border: 1px solid var(--snake-line);
  border-radius: 9px;
  outline: none;
  transition:
    background 140ms ease,
    border-color 140ms ease,
    box-shadow 140ms ease;
}

#snake-game .snake-player-form__input::placeholder {
  color: var(--snake-parchment-faint);
}

#snake-game .snake-player-form__input:hover {
  border-color: rgba(200, 155, 60, 0.35);
}

#snake-game .snake-player-form__input:focus {
  border-color: var(--snake-brass);
  background: rgba(233, 226, 208, 0.07);
  box-shadow: 0 0 0 2px rgba(200, 155, 60, 0.14);
}

#snake-game .snake-player-form__input:invalid:not(:placeholder-shown) {
  border-color: rgba(192, 82, 82, 0.65);
}

#snake-game .snake-player-form__error {
  min-height: 1.1rem;
  margin: 0.25rem 0 0;
  font-family: var(--snake-font-mono);
  font-size: 0.7rem;
  line-height: 1.4;
  color: var(--snake-oxblood);
}

@media (max-width: 400px) {

  #snake-game .snake-player-form__input {
    padding: 0.65rem 0.7rem;
    font-size: 0.86rem;
  }

}


/* -------------------------------- options -------------------------------- */

#snake-game .snake-option-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.6rem;
}

#snake-game .snake-option-list {
  display: grid;
  gap: 0.5rem;
}

#snake-game .snake-option {
  padding: 0.75rem 0.85rem;
  background: var(--snake-panel-soft);
  border: 1px solid var(--snake-line);
  border-radius: 10px;
  text-align: left;
}

#snake-game .snake-option--button {
  display: block;
  width: 100%;
  cursor: pointer;
  font: inherit;
  transition:
    border-color 140ms ease,
    background 140ms ease;
}

#snake-game .snake-option--button:hover {
  border-color: rgba(200, 155, 60, 0.45);
}

#snake-game .snake-option--button:focus-visible {
  outline: 2px solid var(--snake-brass);
  outline-offset: 2px;
}

#snake-game .snake-option--button[aria-pressed="true"],
#snake-game [data-selectable][aria-pressed="true"] {
  border-color: var(--snake-jade);
}

#snake-game .snake-option--button[aria-pressed="true"] {
  background: rgba(99, 199, 155, 0.09);
}

#snake-game .snake-option__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.6rem;
}

#snake-game .snake-option__name {
  display: block;
  font-family: var(--snake-font-display);
  font-size: 1.05rem;
  font-weight: 600;
}

#snake-game .snake-option__best,
#snake-game .snake-option__stats {
  display: block;
  font-family: var(--snake-font-mono);
  font-size: 0.68rem;
  color: var(--snake-parchment-faint);
}

#snake-game .snake-option__stats {
  margin-top: 0.35rem;
}

#snake-game .snake-option__blurb {
  display: block;
  margin-top: 0.2rem;
  font-size: 0.82rem;
  color: var(--snake-parchment-dim);
}

#snake-game .snake-option__rules {
  margin-top: 0.5rem;
  display: grid;
  gap: 0.15rem;
}

#snake-game .snake-option__rules li {
  position: relative;
  padding-left: 0.85rem;
  font-size: 0.76rem;
  color: var(--snake-parchment-dim);
}

#snake-game .snake-option__rules li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 4px;
  height: 1px;
  background: var(--snake-brass);
}

#snake-game .snake-option__actions {
  display: flex;
  gap: 0.4rem;
  margin-top: 0.7rem;
}


/* -------------------------------- settings ------------------------------- */

#snake-game .snake-settings {
  display: grid;
  gap: 0.15rem;
}

#snake-game .snake-setting {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.5rem 0;
  border-bottom: 1px solid rgba(233, 226, 208, 0.07);
}

#snake-game .snake-setting:last-child {
  border-bottom: 0;
}

#snake-game .snake-setting__label {
  font-size: 0.88rem;
  cursor: pointer;
}

#snake-game .snake-setting__hint {
  display: block;
  font-family: var(--snake-font-mono);
  font-size: 0.66rem;
  color: var(--snake-parchment-faint);
}

#snake-game .snake-setting__toggle {
  appearance: none;
  -webkit-appearance: none;
  flex: none;
  width: 46px;
  height: 26px;
  border-radius: 999px;
  background: rgba(233, 226, 208, 0.12);
  border: 1px solid var(--snake-line);
  position: relative;
  cursor: pointer;
  transition: background 160ms ease;
}

#snake-game .snake-setting__toggle::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--snake-parchment);
  transition: transform 160ms ease;
}

#snake-game .snake-setting__toggle:checked {
  background: var(--snake-jade);
}

#snake-game .snake-setting__toggle:checked::after {
  transform: translateX(20px);
  background: var(--snake-ink);
}

#snake-game .snake-setting__toggle:focus-visible {
  outline: 2px solid var(--snake-brass);
  outline-offset: 2px;
}

#snake-game .snake-setting__range {
  width: 46%;
  accent-color: var(--snake-brass);
  cursor: pointer;
}


/* ------------------------------- how to play ----------------------------- */

#snake-game .snake-howto {
  display: grid;
  gap: 0.5rem;
}

#snake-game .snake-howto li {
  position: relative;
  padding-left: 1rem;
  font-size: 0.86rem;
  color: var(--snake-parchment-dim);
}

#snake-game .snake-howto li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 1px;
  background: var(--snake-brass);
}

#snake-game .snake-howto__subtitle {
  margin-top: 1.1rem;
  margin-bottom: 0.4rem;
  font-family: var(--snake-font-display);
  font-size: 1rem;
  font-weight: 600;
}

#snake-game .snake-howto__modes {
  font-size: 0.82rem;
}

#snake-game .snake-howto__modes dt {
  font-weight: 600;
  margin-top: 0.4rem;
}

#snake-game .snake-howto__modes dd {
  color: var(--snake-parchment-dim);
}


/* ------------------------------- game over ------------------------------- */

#snake-game .snake-result {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.5rem 0.9rem;
  margin: 0.2rem 0 1.3rem;
}

#snake-game .snake-result > div {
  padding: 0.5rem 0.2rem;
  border-top: 1px solid var(--snake-line);
}

#snake-game .snake-result dt {
  font-family: var(--snake-font-mono);
  font-size: 0.66rem;
  color: var(--snake-parchment-faint);
}

#snake-game .snake-result dd {
  font-family: var(--snake-font-mono);
  font-size: 1.25rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

#snake-game .snake-flash {
  font-family: var(--snake-font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  color: var(--snake-brass);
  margin-bottom: 0.6rem;
  animation: snake-flash 1.6s ease-out 2;
}

#snake-game .snake-flash[hidden] {
  display: none;
}

@keyframes snake-flash {

  0% {
    opacity: 0;
    transform: scale(0.82);
    text-shadow: 0 0 0 rgba(200, 155, 60, 0);
  }

  25% {
    opacity: 1;
    transform: scale(1.04);
    text-shadow: 0 0 18px rgba(200, 155, 60, 0.75);
  }

  100% {
    opacity: 1;
    transform: scale(1);
    text-shadow: 0 0 6px rgba(200, 155, 60, 0.25);
  }

}


/* ------------------------------- leaderboard ----------------------------- */

#snake-game .snake-leaderboard {
  width: 100%;
  min-width: 0;
}

#snake-game .snake-leaderboard__table-wrap {
  width: 100%;
  max-height: 20rem;
  overflow-y: auto;
  overflow-x: auto;
  overscroll-behavior: contain;
  border: 1px solid var(--snake-line);
  border-radius: 10px;
  scrollbar-width: thin;
  scrollbar-color: var(--snake-brass) transparent;
}

#snake-game .snake-leaderboard__table-wrap::-webkit-scrollbar {
  width: 7px;
  height: 7px;
}

#snake-game .snake-leaderboard__table-wrap::-webkit-scrollbar-track {
  background: transparent;
}

#snake-game .snake-leaderboard__table-wrap::-webkit-scrollbar-thumb {
  background: var(--snake-brass);
  border-radius: 999px;
}

#snake-game .snake-leaderboard__table-wrap::-webkit-scrollbar-thumb:hover {
  background: #d5aa4b;
}

#snake-game .snake-leaderboard__table {
  width: 100%;
  min-width: 100%;
  border-collapse: collapse;
  font-family: var(--snake-font-mono);
  font-size: 0.78rem;
}

#snake-game .snake-leaderboard__table th,
#snake-game .snake-leaderboard__table td {
  padding: 0.65rem 0.7rem;
  text-align: left;
  border-bottom: 1px solid rgba(233, 226, 208, 0.08);
  white-space: nowrap;
}

#snake-game .snake-leaderboard__table th {
  position: sticky;
  top: 0;
  z-index: 2;
  background: var(--snake-ink);
  color: var(--snake-parchment-dim);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

#snake-game .snake-leaderboard__table td {
  color: var(--snake-parchment);
}

#snake-game .snake-leaderboard__table tbody tr:last-child td {
  border-bottom: 0;
}

#snake-game .snake-leaderboard__table th:first-child,
#snake-game .snake-leaderboard__table td:first-child {
  width: 3.5rem;
  text-align: center;
}

#snake-game .snake-leaderboard__table th:last-child,
#snake-game .snake-leaderboard__table td:last-child {
  width: 5rem;
  text-align: right;
}

#snake-game .snake-leaderboard__loading,
#snake-game .snake-leaderboard__empty,
#snake-game .snake-leaderboard__error {
  padding: 1rem 0.5rem;
  text-align: center;
  font-family: var(--snake-font-mono);
  font-size: 0.72rem;
}

#snake-game .snake-leaderboard__empty,
#snake-game .snake-leaderboard__loading {
  color: var(--snake-parchment-faint);
}

#snake-game .snake-leaderboard__error {
  color: var(--snake-oxblood);
}


/* --------------------------------- bar ----------------------------------- */

#snake-game .snake-game__bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  padding: 0.35rem 0.5rem;
  background: var(--snake-panel-soft);
  border: 1px solid var(--snake-line);
  border-radius: var(--snake-radius);
}

#snake-game .snake-game__bar[hidden] {
  display: none;
}

#snake-game .snake-game__meta {
  font-family: var(--snake-font-mono);
  font-size: 0.72rem;
  color: var(--snake-parchment-faint);
  text-align: center;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}


/* ------------------------------- touch pad ------------------------------- */

#snake-game .snake-pad {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 0.4rem;
  width: min(208px, 56vw);
  aspect-ratio: 1;
  margin: 0.2rem auto 0;
  touch-action: manipulation;
}

#snake-game .snake-pad[hidden] {
  display: none;
}

#snake-game .snake-pad__button {
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--snake-panel-soft);
  border: 1px solid var(--snake-line);
  border-radius: 12px;
  color: var(--snake-parchment-dim);
  cursor: pointer;
  transition:
    background 120ms ease,
    color 120ms ease;
}

#snake-game .snake-pad__button:active {
  background: rgba(99, 199, 155, 0.18);
  color: var(--snake-jade);
}

#snake-game .snake-pad__button:focus-visible {
  outline: 2px solid var(--snake-brass);
  outline-offset: 2px;
}

#snake-game .snake-pad__button::before {
  content: "";
  width: 30%;
  height: 26%;
  background: currentColor;
  clip-path: polygon(
    50% 0%,
    100% 100%,
    0% 100%
  );
}

#snake-game .snake-pad__key--up {
  grid-area: 1 / 2;
}

#snake-game .snake-pad__key--left {
  grid-area: 2 / 1;
}

#snake-game .snake-pad__key--right {
  grid-area: 2 / 3;
}

#snake-game .snake-pad__key--down {
  grid-area: 3 / 2;
}

#snake-game .snake-pad__key--down::before {
  transform: rotate(180deg);
}

#snake-game .snake-pad__key--left::before {
  transform: rotate(-90deg);
}

#snake-game .snake-pad__key--right::before {
  transform: rotate(90deg);
}


/* ------------------------------ responsive ------------------------------- */

@media (min-width: 700px) {

  #snake-game .snake-option-grid {
    grid-template-columns: 1fr 1fr;
  }

}

@media (max-height: 760px) and (min-width: 681px) {

  #snake-game {
    --snake-stage-size: min(700px, 72vh, 80vw);
  }

}

@media (max-width: 680px) {

  #snake-game {
    --snake-stage-size: min(94vw, 52vh);
    --snake-gap: 0.45rem;
  }

  #snake-game .snake-hud__item {
    padding: 0 0.5rem;
  }

  #snake-game .snake-hud__value {
    font-size: 0.95rem;
  }

  #snake-game .snake-hud__effects {
    width: 100%;
    margin-left: 0;
    padding: 0.35rem 0 0;
  }

  #snake-game .snake-screen__panel {
    padding: 1.1rem 1rem 1.2rem;
  }

  #snake-game .snake-option-grid {
    gap: 0.45rem;
  }

  #snake-game .snake-leaderboard__table-wrap {
    max-height: 16rem;
  }

}

@media (max-width: 400px) {

  #snake-game .snake-hud__item[data-hud-item="level"] {
    display: none;
  }

  #snake-game .snake-leaderboard__table th,
  #snake-game .snake-leaderboard__table td {
    padding: 0.55rem 0.5rem;
  }

}


/* ---------------------------- reduced motion ----------------------------- */

#snake-game[data-reduced-motion="true"] *,
#snake-game[data-reduced-motion="true"] *::before,
#snake-game[data-reduced-motion="true"] *::after {
  animation: none !important;
  transition-duration: 1ms !important;
}

@media (prefers-reduced-motion: reduce) {

  #snake-game *,
  #snake-game *::before,
  #snake-game *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
  }

}


/* ===========================================================================
   Standalone demo page only — delete this block when embedding.
   =========================================================================== */

body.snake-demo-page {

  margin: 0;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(0.75rem, 3vw, 2rem);

  background:
    radial-gradient(
      1200px 600px at 50% -10%,
      #16202e 0%,
      #0b121c 62%,
      #080d14 100%
    );

  color: #e9e2d0;

  font-family:
    "Inter",
    system-ui,
    -apple-system,
    "Segoe UI",
    Roboto,
    sans-serif;
}

.snake-demo-page__inner {
  width: 100%;
}


/* --------------------------- loading screen ----------------------------- */

#snake-game {
  position: relative;
}

#snake-game[data-loading="true"] {
  min-height: 320px;
}

#snake-game[data-loading="true"] .snake-game__frame {
  opacity: 0;
  visibility: hidden;
}

#snake-game[data-loading="true"]::before {

  content: "";

  position: absolute;
  inset: 0;
  z-index: 100;

  border: 1px solid var(--snake-line);
  border-radius: var(--snake-radius);

  background:
    linear-gradient(
      110deg,
      rgba(14, 22, 33, 0.98) 0%,
      rgba(20, 30, 42, 0.98) 45%,
      rgba(14, 22, 33, 0.98) 100%
    );

  background-size: 220% 100%;

  box-shadow:
    0 18px 40px rgba(5, 9, 14, 0.35);

  animation:
    snake-loading-sweep
    1.1s
    ease-in-out
    infinite;
}

#snake-game[data-loading="true"]::after {

  content: "SNAKE\A Initializing game...";

  position: absolute;
  inset: 0;
  z-index: 101;

  display: flex;
  align-items: center;
  justify-content: center;

  text-align: center;
  white-space: pre;

  padding: 1rem;

  font-family: var(--snake-font-mono);
  font-size: 0.78rem;
  line-height: 2;
  letter-spacing: 0.12em;

  color: var(--snake-parchment-dim);
  text-transform: uppercase;

  animation:
    snake-loading-pulse
    900ms
    ease-in-out
    infinite;

  pointer-events: none;
}

@keyframes snake-loading-sweep {

  0% {
    background-position: 100% 0;
  }

  50% {
    background-position: 0% 0;
  }

  100% {
    background-position: 100% 0;
  }

}

@keyframes snake-loading-pulse {

  0%,
  100% {
    opacity: 0.55;
    transform: scale(0.98);
  }

  50% {
    opacity: 1;
    transform: scale(1);
  }

}