/* The existing game shares the site palette; only the play area captures touch. */
.hero-ambient { position: absolute; right: 0; bottom: 0; width: min(440px, 100%); height: 192px; z-index: -1; overflow: hidden; pointer-events: none; }
.home-hero { isolation: isolate; }
.snake-field {
  position: absolute;
  inset: 0;
  z-index: 0;
  display: block;
  width: 100%;
  height: 100%;
  opacity: .22;
  pointer-events: none;
}
.snake-field.snake-field-playing {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 1;
}
.snake-playing { overflow: hidden; }
.snake-launcher {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 20;
}
.snake-dialog {
  box-sizing: border-box;
  width: min(820px, calc(100% - 32px));
  max-width: none;
  max-height: calc(100dvh - 32px);
  margin: auto;
  padding: 0;
  overflow: hidden;
  color: var(--tds-ink, #202834);
  background: var(--tds-surface-solid, #FFFFFF);
  border: 1px solid var(--tds-border, #BCC9DA);
  border-radius: var(--tds-radius-dialog, 22px);
  box-shadow: 0 16px 48px rgb(32 40 52 / .16);
  font: inherit;
}
.snake-dialog[open] { display: flex; flex-direction: column; }
.snake-dialog::backdrop { background: var(--tds-backdrop, rgb(32 40 52 / .4)); }
.snake-dialog-header,
.snake-dialog-footer {
  display: flex;
  flex-shrink: 0;
  align-items: center;
  gap: 12px;
  padding: 20px 24px;
}
.snake-dialog-header { justify-content: space-between; border-bottom: 1px solid var(--tds-divider, #E4E9F1); }
.snake-dialog-header h2 { margin: 0; font-size: 24px; font-weight: 600; letter-spacing: -.025em; line-height: 1.2; }
.snake-eyebrow { margin: 0 0 4px; color: var(--tds-muted, #667286); font-size: 12px; }
.snake-dialog-body { min-height: 0; overflow-y: auto; padding: 0 24px; scrollbar-gutter: stable; }
.snake-scoreboard { display: flex; gap: 24px; align-items: baseline; padding: 16px 0; }
.snake-scoreboard p { margin: 0; color: var(--tds-muted, #667286); font-size: 13px; line-height: 1.5; }
.snake-scoreboard strong { margin-left: 6px; color: var(--tds-ink, #202834); font-size: 20px; font-variant-numeric: tabular-nums; font-weight: 600; }
.snake-scoreboard .snake-level { margin-left: auto; text-align: right; }
.snake-stage {
  position: relative;
  height: clamp(240px, 43dvh, 384px);
  overflow: hidden;
  border: 1px solid var(--tds-border, #BCC9DA);
  border-radius: 12px;
  background: var(--tds-paper, #ECF1F8);
  touch-action: none;
}
.snake-stage-message {
  position: absolute;
  z-index: 1;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: max-content;
  max-width: calc(100% - 32px);
  padding: 16px 24px;
  border: 1px solid var(--tds-border, #BCC9DA);
  border-radius: 12px;
  background: var(--tds-surface-solid, #FFFFFF);
  font-size: 20px;
  font-weight: 600;
  text-align: center;
  pointer-events: none;
}
.snake-instructions { margin: 12px 0 0; max-width: 68ch; color: var(--tds-muted, #667286); font-size: 13px; line-height: 1.5; }
.snake-status { min-height: 20px; margin: 8px 0 16px; color: var(--tds-muted, #667286); font-size: 13px; line-height: 1.5; }
.snake-dialog-footer { flex-wrap: wrap; padding-top: 16px; border-top: 1px solid var(--tds-divider, #E4E9F1); }
.snake-button,
.snake-launcher {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 16px;
  color: var(--tds-ink, #202834);
  background: var(--tds-surface-solid, #FFFFFF);
  border: 1px solid var(--tds-border, #BCC9DA);
  border-radius: var(--tds-radius-button, 11px);
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  line-height: 1.3;
  cursor: pointer;
}
.snake-button:hover,
.snake-launcher:hover { background: var(--tds-hover, #E3ECFA); border-color: var(--tds-accent, #176BEA); }
.snake-button:active,
.snake-launcher:active { background: var(--tds-pressed, #D7E5F9); }
.snake-button:disabled { color: var(--tds-disabled-text); background: var(--tds-disabled); border-color: var(--tds-border); cursor: default; }
.snake-button:focus-visible,
.snake-launcher:focus-visible,
.snake-stage:focus-visible { outline: 3px solid var(--tds-focus, #176BEA); outline-offset: 3px; }
.snake-button.snake-primary { color: white; background: var(--tds-primary-background); border-color: var(--tds-accent, #176BEA); }
.snake-button.snake-primary:hover { background: var(--tds-accent-hover, #105CCB); }
.snake-close span { font-size: 24px; font-weight: 400; line-height: 1; }
.snake-exit-hint { margin-left: auto; color: var(--tds-muted, #667286); font-size: 12px; }
.snake-direction-pad { display: none; }
.snake-touch-instructions { display: none; }
.snake-dialog [hidden] { display: none; }
@media (max-width: 600px), (pointer: coarse) {
  .snake-keyboard-instructions { display: none; }
  .snake-touch-instructions { display: inline; }
  .snake-direction-pad { display: grid; grid-template-columns: repeat(3, 48px); gap: 4px; justify-content: center; margin: 12px 0; }
  .snake-direction-pad [data-snake-direction="up"] { grid-column: 2; }
  .snake-direction-pad [data-snake-direction="left"] { grid-column: 1; }
  .snake-direction-pad .snake-button { padding: 8px; font-size: 20px; touch-action: manipulation; }
}
@media (max-width: 600px) {
  .snake-dialog { width: calc(100% - 20px); max-height: calc(100dvh - 20px); }
  .snake-dialog-header,
  .snake-dialog-footer { padding: 16px; gap: 8px; }
  .snake-dialog-body { padding: 0 16px; }
  .snake-dialog-header h2 { font-size: 20px; }
  .snake-scoreboard { gap: 16px; }
  .snake-stage { height: clamp(240px, 36dvh, 320px); }
  .snake-exit-hint { display: none; }
  .snake-dialog-footer .snake-button { flex: 1; padding-inline: 10px; }
  .snake-status { margin-bottom: 12px; }
}
@media (prefers-reduced-transparency: reduce) {
  .snake-dialog::backdrop { background: rgb(32 40 52 / .72); }
}

/* The same modal becomes the full-screen game, including on mobile browsers
   without the native Fullscreen API. The logical board scales without resetting. */
.snake-dialog.snake-expanded {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100dvh;
  max-height: none;
  margin: 0;
  border: 0;
  border-radius: 0;
  box-shadow: none;
  animation: none;
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left);
}
.snake-expanded .snake-dialog-header,
.snake-expanded .snake-dialog-footer { padding-block: 12px; }
.snake-expanded .snake-dialog-body {
  display: grid;
  flex: 1;
  grid-template-rows: auto minmax(0, 1fr) auto auto auto;
  overflow: hidden;
  scrollbar-gutter: auto;
}
.snake-expanded .snake-scoreboard { grid-row: 1; padding-block: 12px; }
.snake-expanded .snake-stage { grid-row: 2; min-height: 0; height: auto; border-color: transparent; background: transparent; }
.snake-expanded .snake-field-playing { border-radius: 8px; outline: 1px solid var(--tds-border); outline-offset: -1px; }
.snake-expanded .snake-instructions { grid-row: 3; max-width: none; }
.snake-expanded .snake-direction-pad { grid-row: 4; margin-block: 8px; }
.snake-expanded .snake-status { grid-row: 5; margin-block: 6px 10px; }
@media (max-height: 650px) {
  .snake-expanded .snake-eyebrow,
  .snake-expanded .snake-instructions { display: none; }
  .snake-expanded .snake-dialog-header h2 { font-size: 20px; }
  .snake-expanded .snake-scoreboard { padding-block: 8px; }
}
@media (max-height: 520px) and (min-width: 600px) {
  .snake-expanded .snake-dialog-body { grid-template-columns: minmax(0, 1fr) auto; grid-template-rows: auto minmax(0, 1fr) auto; column-gap: 20px; }
  .snake-expanded .snake-scoreboard { grid-column: 1 / -1; }
  .snake-expanded .snake-stage { grid-column: 1; }
  .snake-expanded .snake-direction-pad { grid-column: 2; grid-row: 2; align-self: center; }
  .snake-expanded .snake-status { grid-column: 1 / -1; grid-row: 3; }
}

/* Reserve a quiet strip for the ambient game below the mobile hero actions. */
@media (max-width: 760px) {
  .nav-ready .home-hero .hero-ambient { position: relative; order: 1; width: 100%; height: 96px; flex: none; }
  .nav-ready .home-hero .hero-note { order: 2; margin-top: 0; }
}