/*
 * OCFai CSS contract
 * AI_RULE: define only classes matching OCFAI_ALLOWED_PREFIXES in this file.
 * AI_RULE: shared UI patterns must use their canonical component CSS instead of local variants.
 * OCFAI_ROLE: components
 * OCFAI_ALLOWED_PREFIXES: snake-
 */
.snake-page {
  min-height: 100vh;
  display: grid;
  place-items: start center;
  padding: 28px 30px 24px;
  overflow: hidden;
  background:
    radial-gradient(circle at 78% 16%, rgb(183 255 56 / .08), transparent 26%),
    linear-gradient(rgb(20 52 70 / .15) 1px, transparent 1px),
    linear-gradient(90deg, rgb(20 52 70 / .15) 1px, transparent 1px),
    linear-gradient(145deg, var(--snake-color-page), #020711);
  background-size: auto, 48px 48px, 48px 48px, auto;
  color: var(--snake-color-text);
}

.snake-shell {
  width: min(100%, var(--snake-shell-width));
  display: grid;
  grid-template-columns: minmax(280px, var(--snake-sidebar-width)) minmax(0, 1fr);
  gap: 28px;
  align-items: start;
}

.snake-control-panel {
  position: relative;
  min-height: min(874px, calc(100vh - 56px));
  display: flex;
  flex-direction: column;
  padding: var(--mk-space-9);
  border: 1px solid var(--snake-color-line);
  border-radius: 22px;
  background: linear-gradient(180deg, var(--snake-color-panel-strong), var(--snake-color-panel));
  box-shadow: var(--snake-shadow-panel);
  clip-path: none;
}

.snake-control-panel::before {
  content: "";
  position: absolute;
  inset: 8px;
  border: 0;
  background: radial-gradient(circle, var(--snake-color-neon) 0 2px, transparent 2.5px) 0 0 / 9px 9px no-repeat;
  opacity: .45;
  pointer-events: none;
}

.snake-brand {
  padding-bottom: var(--mk-space-7);
  border-bottom: 2px solid var(--snake-color-neon);
}

.snake-brand-mark {
  display: block;
  width: 28px;
  height: 24px;
  margin: 0;
  overflow: hidden;
  color: var(--snake-color-neon);
  filter: drop-shadow(0 0 8px var(--snake-color-neon));
}

.snake-title {
  margin: 0;
  color: var(--snake-color-neon);
  font-family: var(--mk-font-mono);
  font-size: var(--snake-display-size);
  font-weight: 900;
  line-height: .88;
  letter-spacing: -.055em;
  text-transform: uppercase;
  text-shadow: 0 0 18px var(--snake-color-neon-soft);
}

.snake-title-image {
  width: 100%;
  height: auto;
  display: block;
  filter: drop-shadow(0 0 12px var(--snake-color-neon-soft));
}

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

.snake-intro {
  display: grid;
  justify-items: center;
  gap: var(--mk-space-5);
  padding: 42px 0 28px;
  text-align: center;
}

.snake-icon {
  width: 96px;
  height: 96px;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: var(--snake-radius-panel);
  background: transparent;
  box-shadow: none;
}

.snake-icon-image {
  width: 112px;
  height: 100px;
  display: block;
  filter: drop-shadow(0 0 10px var(--snake-color-neon));
}

.snake-subtitle {
  margin: 0;
  color: var(--snake-color-text);
  font-size: var(--mk-font-size-base);
  font-weight: 700;
  line-height: 1.45;
}

.snake-status {
  display: grid;
  gap: var(--mk-space-3);
}

.snake-status[hidden] {
  display: none;
}

.snake-status-text {
  color: var(--snake-color-neon);
  font-size: var(--mk-font-size-xs);
  font-weight: 800;
  letter-spacing: .08em;
  text-align: center;
  text-transform: uppercase;
}

.snake-control-panel > .snake-status .snake-status-text,
.snake-control-copy {
  display: none;
}

.snake-status {
  margin-top: 4px;
}

.snake-button {
  position: relative;
  width: 100%;
  min-height: 96px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--mk-space-3);
  padding: var(--mk-space-4) var(--mk-space-7);
  border: 3px solid #dcff66;
  border-radius: 22px;
  background: linear-gradient(135deg, var(--snake-color-neon), var(--snake-color-neon-strong));
  color: var(--snake-color-page);
  box-shadow: var(--snake-shadow-neon);
  cursor: pointer;
  font-size: 22px;
  font-weight: 900;
  text-transform: uppercase;
  transition: transform var(--mk-motion-fast), box-shadow var(--mk-motion-fast);
  clip-path: none;
}

.snake-button:hover,
.snake-button:focus-visible {
  transform: translateY(-2px);
  box-shadow: 0 0 0 3px var(--snake-color-neon-soft), 0 0 38px var(--snake-color-neon-soft);
  outline: none;
}

.snake-button::before {
  content: "▶";
  font-size: var(--mk-font-size-md);
}

.snake-button::after {
  content: "";
  position: absolute;
  inset: 5px;
  border: 2px solid rgb(3 9 20 / .42);
  border-radius: 15px;
  pointer-events: none;
}

.snake-control-hint {
  display: grid;
  gap: var(--mk-space-1);
  margin-top: 36px;
  padding-top: var(--mk-space-7);
  border-top: 1px solid var(--snake-color-line-soft);
  color: var(--snake-color-muted);
  font-size: var(--mk-font-size-sm);
  text-align: center;
}

.snake-control-hint::before {
  content: "◇";
  width: 100%;
  margin-top: -30px;
  color: var(--snake-color-neon);
  background: var(--snake-color-panel);
  font-size: 18px;
}

.snake-control-hint-title {
  margin-bottom: var(--mk-space-1);
  color: var(--snake-color-neon);
  font-size: var(--mk-font-size-xs);
  letter-spacing: .08em;
  text-transform: uppercase;
}

.snake-dpad {
  width: 126px;
  display: grid;
  grid-template-columns: repeat(3, 38px);
  grid-template-rows: repeat(2, 38px);
  gap: var(--mk-space-0-5);
  justify-self: center;
  margin: var(--mk-space-2) auto;
}

.snake-dpad-button {
  display: grid;
  place-items: center;
  padding: 0;
  border: 1px solid var(--snake-color-neon);
  border-radius: var(--mk-radius-md);
  background: var(--snake-color-panel-strong);
  color: var(--snake-color-text);
  cursor: pointer;
  font-size: var(--mk-font-size-md);
  font-weight: 900;
  box-shadow: 0 0 12px var(--snake-color-neon-soft);
}

.snake-dpad-button:hover,
.snake-dpad-button:focus-visible {
  background: var(--snake-color-neon);
  color: var(--snake-color-page);
  outline: 2px solid var(--snake-color-neon-soft);
}

.snake-dpad-button-up {
  grid-column: 2;
  grid-row: 1;
}

.snake-dpad-button-left {
  grid-column: 1;
  grid-row: 2;
}

.snake-dpad-button-down {
  grid-column: 2;
  grid-row: 2;
}

.snake-dpad-button-right {
  grid-column: 3;
  grid-row: 2;
}

.snake-control-copy {
  color: var(--snake-color-muted);
  font-size: var(--mk-font-size-xs);
}

.snake-tip {
  display: flex;
  gap: var(--mk-space-3);
  margin: auto 0 0;
  padding-top: var(--mk-space-7);
  border-top: 1px dashed var(--snake-color-line);
  color: var(--snake-color-muted);
  font-size: var(--mk-font-size-sm);
  line-height: 1.45;
}

.snake-tip-icon {
  color: var(--snake-color-neon);
  font-size: var(--mk-font-size-md);
}

.snake-game-area {
  min-width: 0;
  display: grid;
  gap: var(--mk-space-4);
}

.snake-game-header {
  display: flex;
  align-items: stretch;
  justify-content: flex-end;
  gap: var(--mk-space-4);
}

.snake-scoreboard {
  display: grid;
  grid-template-columns: repeat(2, minmax(150px, 210px));
  gap: var(--mk-space-4);
}

.snake-stat {
  min-height: 112px;
  display: grid;
  place-content: center;
  padding: var(--mk-space-5) var(--mk-space-8);
  border: 1px solid var(--snake-color-line);
  border-radius: 18px;
  background: linear-gradient(180deg, var(--snake-color-panel-strong), var(--snake-color-panel));
  box-shadow: var(--snake-shadow-panel);
  text-align: center;
  clip-path: none;
}

.snake-stat-label {
  color: var(--snake-color-neon);
  font-size: var(--mk-font-size-xs);
  font-weight: 850;
  letter-spacing: .1em;
  text-transform: uppercase;
}

.snake-stat-value {
  margin-top: var(--mk-space-1);
  color: var(--snake-color-text);
  font-family: var(--mk-font-mono);
  font-size: 48px;
  font-weight: 900;
  line-height: 1;
}

.snake-guide {
  position: relative;
  min-width: 88px;
  display: grid;
  place-items: center;
  align-content: center;
  gap: var(--mk-space-1);
}

.snake-guide-button {
  width: 62px;
  height: 62px;
  display: grid;
  place-items: center;
  padding: 0;
  border: 2px solid var(--snake-color-neon);
  border-radius: 50%;
  background: var(--snake-color-panel);
  color: var(--snake-color-neon);
  box-shadow: var(--snake-shadow-neon);
  cursor: help;
  font: inherit;
  font-size: var(--mk-font-size-md);
  font-weight: 900;
}

.snake-guide-label {
  color: var(--snake-color-text);
  font-size: var(--mk-font-size-xs);
}

.snake-guide-button:hover,
.snake-guide-button:focus-visible,
.snake-guide-button[aria-expanded="true"] {
  background: var(--snake-color-neon);
  color: var(--snake-color-page);
  outline: 3px solid var(--snake-color-neon-soft);
}

.snake-guide-tooltip {
  position: absolute;
  z-index: 4;
  top: calc(100% + var(--mk-space-2));
  right: 0;
  width: min(300px, calc(100vw - 48px));
  display: grid;
  gap: var(--mk-space-2);
  padding: var(--mk-space-5);
  border: 1px solid var(--snake-color-line);
  border-radius: var(--snake-radius-panel);
  background: var(--snake-color-panel);
  color: var(--snake-color-text);
  box-shadow: var(--snake-shadow-panel);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity var(--mk-motion-fast), transform var(--mk-motion-fast), visibility var(--mk-motion-fast);
  pointer-events: none;
  font-size: var(--mk-font-size-sm);
  line-height: 1.45;
}

.snake-guide:hover .snake-guide-tooltip,
.snake-guide:focus-within .snake-guide-tooltip,
.snake-guide-button[aria-expanded="true"] + .snake-guide-label + .snake-guide-tooltip {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.snake-board-wrap {
  position: relative;
  width: 100%;
  aspect-ratio: 25 / 17;
  justify-self: end;
  border: 2px solid var(--snake-color-neon);
  border-radius: 28px;
  background: var(--snake-color-board);
  box-shadow: var(--snake-shadow-neon), var(--snake-shadow-panel);
  overflow: hidden;
  clip-path: none;
}

.snake-board-wrap::before {
  content: none;
}

.snake-board-ornament {
  display: none;
}

.snake-board-ornament-tl {
  top: 14px;
  left: 14px;
}

.snake-board-ornament-tr {
  top: 14px;
  right: 22px;
}

.snake-board-ornament-bl {
  bottom: 22px;
  left: 14px;
}

.snake-board-ornament-br {
  right: 22px;
  bottom: 22px;
}

.snake-board {
  display: block;
  width: 100%;
  height: 100%;
  border-radius: inherit;
  touch-action: none;
}

.snake-game-over {
  position: absolute;
  z-index: 3;
  inset: 0;
  display: grid;
  place-items: center;
  padding: var(--mk-space-6);
  border-radius: inherit;
  background: rgb(3 9 20 / .8);
  backdrop-filter: blur(5px);
  color: var(--snake-color-text);
}

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

.snake-game-over-dialog {
  width: min(100%, 390px);
  display: grid;
  justify-items: center;
  gap: var(--mk-space-3);
  padding: var(--mk-space-9);
  border: 1px solid var(--snake-color-neon);
  border-radius: var(--snake-radius-panel);
  background: var(--snake-color-panel);
  box-shadow: var(--snake-shadow-neon), var(--snake-shadow-panel);
  text-align: center;
}

.snake-game-over-label {
  color: var(--snake-color-neon);
  font-size: var(--mk-font-size-xs);
  font-weight: 800;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.snake-game-over-title {
  color: var(--snake-color-text);
  font-family: var(--mk-font-mono);
  font-size: 2.7rem;
  line-height: 1;
}

.snake-game-over-score {
  display: grid;
  gap: var(--mk-space-1);
  color: var(--snake-color-muted);
  font-size: var(--mk-font-size-base);
}

.snake-game-over-score-value {
  color: var(--snake-color-text);
  font-size: var(--mk-font-size-md);
}

.snake-game-over-button {
  min-width: 210px;
  min-height: 58px;
  margin-top: var(--mk-space-2);
}

@media (max-width: 1100px) {
  .snake-page {
    overflow: visible;
  }

  .snake-shell {
    grid-template-columns: 280px minmax(0, 1fr);
    gap: var(--mk-space-6);
  }

  .snake-control-panel {
    min-height: auto;
    padding: var(--mk-space-7);
  }

  .snake-icon {
    width: 76px;
    height: 76px;
    font-size: 2.8rem;
  }

  .snake-icon-image {
    width: 60px;
    height: 60px;
  }

  .snake-board-wrap {
    max-height: none;
  }
}

@media (max-width: 780px) {
  .snake-page {
    display: block;
    padding: var(--mk-space-5);
  }

  .snake-shell {
    grid-template-columns: 1fr;
    gap: var(--mk-space-5);
  }

  .snake-control-panel {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(180px, .8fr);
    gap: var(--mk-space-5);
    align-items: center;
  }

  .snake-brand,
  .snake-intro {
    justify-items: start;
    text-align: left;
  }

  .snake-intro {
    padding: 0;
  }

  .snake-icon,
  .snake-control-hint,
  .snake-tip {
    display: none;
  }

  .snake-status {
    grid-column: 2;
    grid-row: 1 / span 2;
  }

  .snake-game-header {
    justify-content: space-between;
  }

  .snake-scoreboard {
    flex: 1;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 520px) {
  .snake-page {
    padding: var(--mk-space-3);
  }

  .snake-control-panel {
    grid-template-columns: 1fr;
    padding: var(--mk-space-5);
  }

  .snake-title {
    font-size: 3.2rem;
  }

  .snake-intro {
    display: none;
  }

  .snake-status {
    grid-column: auto;
    grid-row: auto;
  }

  .snake-button {
    min-height: 58px;
  }

  .snake-game-header {
    gap: var(--mk-space-2);
  }

  .snake-scoreboard {
    gap: var(--mk-space-2);
  }

  .snake-stat {
    min-height: 82px;
    padding: var(--mk-space-3);
    border-radius: var(--mk-radius-md);
  }

  .snake-guide {
    min-width: 58px;
  }

  .snake-guide-button {
    width: 48px;
    height: 48px;
  }

  .snake-guide-label {
    display: none;
  }

  .snake-board-wrap {
    border-radius: var(--mk-radius-md);
  }

  .snake-game-over {
    padding: var(--mk-space-3);
  }

  .snake-game-over-dialog {
    padding: var(--mk-space-6);
  }
}