/* =============================================================
   Snake Tactical — Page tokens + layout
   Dark theme provided by design-system via [data-theme="dark"].
   ============================================================= */

/* ---- Tokens derived from design-system ---- */
.page--snake {
  --bg-app: var(--color-bg-neutral);
  --bg-surface: var(--color-surface-neutral);
  --bg-elevated: var(--color-surface-neutral-elevated);
  --bg-grid-light: var(--color-bg-neutral);
  --bg-grid-dark: var(--color-surface-neutral);
  --bg-grid-line: var(--color-border-neutral);
  --border-dark: var(--color-border-neutral);

  --color-action: var(--color-block-action);
  --color-action-hover: var(--color-block-action-hover);
  --color-action-text: var(--color-block-text-action);
  --color-action-border: transparent;

  --color-control: var(--color-block-control);
  --color-control-hover: var(--color-block-control-hover);
  --color-control-text: var(--color-block-text-control);
  --color-control-border: transparent;

  --color-events: var(--color-block-event);
  --color-events-hover: var(--color-block-event-hover);
  --color-events-text: var(--color-block-text-control);
  --color-events-border: transparent;

  --color-snake-head: var(--color-secondary);
  --color-snake-glow: rgba(69, 240, 223, 0.5);
  --color-obstacle: var(--color-outline);

  --color-snap: var(--color-secondary-alt);
  --color-executing: var(--color-secondary);
  --color-executing-glow: rgba(69, 240, 223, 0.5);

  --color-run: var(--color-secondary);
  --color-run-hover: var(--color-block-action-hover);
  --color-pause: var(--color-secondary-alt);
  --color-pause-hover: #6e6ea8;
  --color-clear: var(--color-apple);

  /* Snake entity colors (game-specific) */
  --color-snake-eye: var(--color-block-text-action);
  --color-wall-shadow: var(--color-overlay);
  /* Input fields - neutral dark theme */
  --color-input-bg: var(--color-input-bg-neutral);
  --color-input-border: var(--color-input-border-neutral);
  /* Header button colors */
  --color-run-text: var(--color-block-text-action);
  /* C-block gradient bottoms (solid colors for Figma prototype) */
  --color-control-gradient-end: var(--color-block-control);
  --color-events-gradient-end: var(--color-block-event);
  /* Snake body segment fade-out opacities */
  --snake-body-opacity-far: 0.7;
  --snake-body-opacity-mid: 0.85;

  --color-shadow: var(--color-shadow-pure);

  /* Snap preview background — neutral dark theme */
  --color-snap-bg: var(--color-snap-bg-neutral);

  --font-ui: var(--font-body);
  --font-mono: var(--font-headline);

  --radius-md: 0.75rem;
  --radius-full: 62.5rem;

  --shadow-block: 4px 4px 0 0 var(--color-shadow);
  --shadow-block-hover: 6px 6px 0 0 var(--color-shadow);
  --shadow-elevated: 8px 8px 0 0 var(--color-shadow);
  --shadow-run: 4px 4px 0 0 var(--color-snake-eye);
  --shadow-pause: 4px 4px 0 0 var(--color-shadow);

  --sidebar-width: 15rem;
}

/* Light mode: visible checkerboard grid cells */
[data-theme="light"] .page--snake {
  --bg-grid-dark: #ebedfa;
}

/* Dark mode: purple pause button */
[data-theme="dark"] .page--snake {
  --color-pause: #8789c0;
}

/* ---- Page layout ---- */
.page--snake {
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--bg-app);
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  line-height: 1.5;
  color: var(--color-text);
}

/* ---- Scrollbar ---- */
.page--snake ::-webkit-scrollbar {
  width: 0.375rem;
  height: 0.375rem;
}

.page--snake ::-webkit-scrollbar-track {
  background: var(--bg-surface);
}

.page--snake ::-webkit-scrollbar-thumb {
  background: var(--bg-grid-line);
  border-radius: var(--radius-full);
}

.page--snake ::-webkit-scrollbar-thumb:hover {
  background: var(--color-surface-hover);
}

/* ---- Top Nav Bar ---- */
.page--snake .app-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 var(--space-lg);
  height: 4rem;
  background: var(--bg-elevated);
  border-bottom: var(--border-width-game) solid var(--border-dark);
  box-shadow: 0 4px 0 0 var(--color-shadow);
  flex-shrink: 0;
  z-index: 50;
}

.page--snake .app-header__left {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.page--snake .app-header__title {
  font-family: var(--font-mono);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-snap);
  letter-spacing: -0.02em;
}

.page--snake .app-header__right {
  display: flex;
  align-items: center;
  gap: var(--space-between);
}

.page--snake .header-btn {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: var(--text-sm-md);
  font-weight: 700;
  cursor: pointer;
  transition: transform var(--duration-instant), box-shadow var(--duration-instant);
  min-height: var(--touch-target-sm);
  white-space: nowrap;
  border-bottom: var(--border-width-game) solid transparent;
}

.page--snake .btn-icon {
  width: var(--icon-between);
  height: var(--icon-between);
  flex-shrink: 0;
  display: inline-block;
  vertical-align: middle;
}

.page--snake .header-btn:active {
  transform: translateY(var(--button-active-offset));
  border-bottom-width: var(--button-active-offset);
}

.page--snake .header-btn--hub {
  background: var(--color-action);
  color: var(--color-action-text);
  border-bottom-color: var(--color-action-border);
  text-decoration: none;
}

.page--snake .header-btn--run {
  background: var(--color-run);
  color: var(--color-run-text);
  box-shadow: var(--shadow-run);
  border-bottom-color: var(--color-run-shadow);
}

.page--snake .header-btn--run:hover {
  background: var(--color-run-hover);
}

.page--snake .header-btn--pause {
  background: var(--color-pause);
  color: var(--color-pause-text);
}

.page--snake .header-btn--pause:hover {
  background: var(--color-pause-hover);
}

.page--snake .header-btn--clear {
  background: var(--color-action);
  color: var(--color-block-text-action);
  border: none;
  border-bottom: 2px solid var(--color-action-border);
  border-radius: var(--radius-md);
  padding: var(--space-2xs) var(--space-between);
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  min-height: var(--touch-target-sm);
  transition: background var(--duration-fast);
}

.page--snake .header-btn--clear:hover {
  background: var(--color-action-hover);
}

.page--snake .header-divider {
  width: 1px;
  height: 1.5rem;
  background: var(--border-dark);
}

/* ---- Level Bar ---- */
.page--snake .level-bar {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-elevated);
  border-bottom: 2px solid var(--border-dark);
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

.page--snake .block-counter {
  color: var(--color-text-muted);
  font-weight: 700;
  margin-left: auto;
  transition: color var(--duration-normal) ease;
}

[data-theme="light"] .page--snake .block-counter {
  color: var(--color-dark);
}

.page--snake .block-counter--limit {
  color: var(--color-apple);
  animation: snakePulseLimit var(--duration-slow) ease-in-out 3;
}

@keyframes snakePulseLimit {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.4;
  }
}

.page--snake .level-name {
  color: var(--color-executing);
  font-weight: 700;
}

.page--snake .progress-reset-btn {
  background: var(--color-action);
  color: var(--color-text);
  border: none;
  border-bottom: 2px solid var(--color-action-border);
  border-radius: var(--radius-md);
  padding: var(--space-2xs) var(--space-between);
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  font-weight: 700;
  cursor: pointer;
  transition: background var(--duration-fast), transform var(--duration-instant);
  min-height: 1.5rem;
}

.page--snake .progress-reset-btn:hover {
  background: var(--color-action-hover);
}

.page--snake .progress-reset-btn:active {
  transform: translateY(1px);
  border-bottom-width: 1px;
}

/* ---- App Layout ---- */
.page--snake .app-container {
  display: grid;
  grid-template-columns: var(--sidebar-width) 1fr var(--stage-column-width-desktop);
  grid-template-rows: 1fr;
  gap: var(--space-sm);
  padding: var(--space-sm);
  height: calc(100vh - var(--layout-header-height) - var(--layout-nav-height));
  max-height: calc(100vh - var(--layout-header-height) - var(--layout-nav-height));
  overflow: hidden;
  position: relative;
}

/* Explicit grid placement for reordered HTML */
.page--snake .app-container > .sidebar {
  grid-column: 1;
  grid-row: 1;
}

.page--snake .app-container > .workspace {
  grid-column: 2;
  grid-row: 1;
}

.page--snake .app-container > .stage-column {
  grid-column: 3;
  grid-row: 1;
}

/* Game controls overlay on workspace cell */
.page--snake .game-controls {
  grid-column: 2;
  grid-row: 1;
  align-self: end;
  justify-self: end;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
  z-index: 100;
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-md);
  background: var(--bg-surface);
}

.page--snake .game-controls__primary {
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
}

.page--snake .game-controls__secondary {
  display: flex;
  justify-content: center;
  gap: var(--space-sm);
  align-items: center;
}

/* Sidebar toggle and close hidden on desktop */
.page--snake .game-controls__btn--sidebar,
.page--snake .sidebar__close-btn,
.page--snake .sidebar-backdrop {
  display: none;
}

/* Stage column - wrapper for stage + card */
.page--snake .stage-column {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  height: 100%;
  min-height: 0;
  overflow: hidden;
}

/* Stage wrapper - contains stage, controls, info */
.page--snake .stage-wrapper {
  display: flex;
  flex-direction: column;
  gap: 0;
  flex: 1 1 auto;
  min-height: 0;
  overflow: hidden;
}

/* Stage individual */
.page--snake .stage {
  display: flex;
  flex-direction: column;
  flex: 1 1 auto;
  min-height: 0;
  overflow: hidden;
}

/* Stage body - where grid lives */
.page--snake .stage__body {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm);
  min-height: 0;
  overflow: hidden;
}

/* Level objective card - fluid height */
.page--snake .level-objective-card {
  flex: 0 0 auto;
  min-height: 10rem;
  max-height: 16rem;
  overflow: hidden;
}

/* Sidebar with internal scroll */
.page--snake .sidebar {
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
}

.page--snake .sidebar__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.page--snake .sidebar__header-left {
  display: flex;
  flex-direction: column;
}

.page--snake .sidebar__close-btn {
  width: var(--touch-target-sm);
  height: var(--touch-target-sm);
  background: transparent;
  border: none;
  color: var(--color-text-bright);
  cursor: pointer;
  border-radius: var(--radius-md);
  flex-shrink: 0;
}

.page--snake .sidebar__close-btn:hover {
  background: rgba(255, 255, 255, 0.1);
}

.page--snake .sidebar__categories {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-md);
}

/* Workspace with internal scroll */
.page--snake .workspace {
  display: flex;
  flex-direction: column;
  height: 100%;
  overflow: hidden;
  position: relative;
}

.page--snake .workspace__area {
  flex: 1;
  overflow: auto;
  padding-right: 20rem;
}

/* Responsive breakpoints */
@media (max-width: var(--breakpoint-snake-laptop)) {
  .page--snake .app-container {
    grid-template-columns: var(--sidebar-width-laptop) 1fr var(--stage-column-width-laptop);
  }
}

@media (max-width: var(--breakpoint-snake-tablet)) {
  .page--snake .app-container {
    grid-template-columns: var(--sidebar-width-tablet) 1fr var(--stage-column-width-tablet);
  }

  .page--snake .level-objective-card {
    min-height: 10rem;
    max-height: 14rem;
  }
}

/* ---- Modal ---- */
.page--snake .modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--color-overlay);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  backdrop-filter: blur(var(--backdrop-blur-amount));
}

.page--snake .modal-overlay[hidden] {
  display: none;
}

.page--snake .modal {
  background: var(--color-surface-modal);
  border: var(--border-width-thin) solid var(--color-snap);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  max-width: var(--modal-max-width);
  width: 90%;
  box-shadow: 8px 8px 0 0 var(--color-shadow);
}

.page--snake .modal__title {
  font-family: var(--font-mono);
  font-size: var(--text-md-lg);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-sm);
}

.page--snake .modal__body {
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  color: var(--color-text-subtle);
  line-height: 1.5;
  margin-bottom: var(--space-lg);
}

.page--snake .modal__actions {
  display: flex;
  gap: var(--space-sm);
  justify-content: flex-end;
}

.page--snake .modal__btn {
  padding: var(--space-sm) var(--space-md);
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: var(--text-sm-md);
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--duration-instant);
  min-height: var(--touch-target-xs);
  border-bottom: 3px solid transparent;
}

.page--snake .modal__btn:active {
  transform: translateY(var(--button-active-offset));
  border-bottom-width: 1px;
}

.page--snake .modal__btn--cancel {
  background: var(--bg-grid-line);
  color: var(--color-text-subtle);
  border-bottom-color: var(--color-cancel-border);
}

.page--snake .modal__btn--cancel:hover {
  background: var(--color-surface-hover);
}

.page--snake .modal__btn--confirm {
  background: var(--color-apple);
  color: var(--color-danger-text);
  border-bottom-color: var(--color-danger-shadow);
}

.page--snake .modal__btn--confirm:hover {
  background: var(--color-danger-hover);
}

/* ---- Toast ---- */
.page--snake .toast {
  position: fixed;
  bottom: var(--space-lg);
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-elevated);
  color: var(--color-text);
  padding: var(--space-between) var(--space-lg);
  border-radius: var(--radius-lg);
  box-shadow: 4px 4px 0 0 var(--color-shadow);
  z-index: 2000;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 700;
  border: var(--border-width-thin) solid var(--color-snap);
  animation: snakeToastIn var(--duration-normal) ease;
}

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

@keyframes snakeToastIn {
  from {
    opacity: 0;
    transform: translateX(-50%) translateY(0.5rem);
  }

  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}

/* Objective button (mobile only) */
.page--snake .header-btn--objective {
  display: none;
  align-items: center;
  gap: var(--space-2xs);
  padding: var(--space-xs) var(--space-sm);
  background: transparent;
  color: var(--color-text-subtle);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  font-weight: 700;
  cursor: pointer;
  min-height: var(--touch-target-xs);
  white-space: nowrap;
  transition: background var(--duration-fast), color var(--duration-fast);
  line-height: 1;
}

.page--snake .header-btn--objective .btn-icon {
  width: 1rem;
  height: 1rem;
  filter: brightness(0) invert(1);
}

.page--snake .header-btn--objective .objective-label {
  line-height: 1;
}

.page--snake .header-btn--objective:hover {
  background: var(--bg-surface);
  color: var(--color-text-bright);
}

/* ---- Mobile layout ---- */
@media (max-width: 47.9375rem) {
  .page--snake .app-header {
    padding: 0 var(--space-sm);
  }

  .page--snake .app-header__title {
    font-size: 1rem;
  }

  .page--snake .header-btn {
    padding: 0.375rem 0.75rem;
    font-size: var(--text-xs);
  }

  .page--snake .level-bar {
    padding: var(--space-xs) var(--space-sm);
  }

  /* Single column flex layout */
  .page--snake .app-container {
    display: flex;
    flex-direction: column;
    gap: 0;
    padding: 0;
    height: auto;
    max-height: calc(100vh - var(--layout-header-height) - var(--layout-nav-height));
    overflow-y: auto;
  }

  .page--snake .app-container > .sidebar,
  .page--snake .app-container > .workspace,
  .page--snake .app-container > .stage-column {
    grid-column: auto;
    grid-row: auto;
  }

  /* Reorder via flex order */
  .page--snake .stage-column { order: 1; }
  .page--snake .game-controls { order: 2; }
  .page--snake .workspace { order: 3; }
  .page--snake .sidebar { order: 4; }

  /* Stage column full width */
  .page--snake .stage-column {
    width: 100%;
    height: auto;
    min-height: 0;
    overflow: hidden;
    flex: none;
  }

  .page--snake .stage-wrapper {
    overflow: visible;
    flex: none;
    min-height: auto;
  }

  .page--snake .stage {
    border-left: none;
    border-bottom: 2px solid var(--border-dark);
    border-radius: 0;
    flex: none;
    min-height: auto;
  }

  .page--snake .stage__body {
    padding: var(--space-sm);
  }

  /* Scale grid for mobile */
  .page--snake .grid {
    max-width: var(--grid-max-width-mobile);
  }

  /* Game controls: full-width in-flow bar */
  .page--snake .game-controls {
    position: static;
    grid-column: auto;
    grid-row: auto;
    align-self: auto;
    justify-self: auto;
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    padding: var(--space-sm) var(--space-md);
    background: var(--bg-surface);
    border: none;
    border-bottom: 1px solid var(--border-dark);
    border-radius: 0;
    gap: var(--space-sm);
    flex-wrap: wrap;
    z-index: auto;
  }

  .page--snake .game-controls__primary {
    display: flex;
    gap: var(--space-sm);
  }

  .page--snake .game-controls__secondary {
    display: flex;
    gap: var(--space-sm);
    align-items: center;
  }

  /* Sidebar toggle and close visible on mobile */
  .page--snake .game-controls__btn--sidebar,
  .page--snake .sidebar__close-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .page--snake .game-controls__btn--sidebar {
    gap: var(--space-2xs);
    padding: var(--space-xs) var(--space-sm);
    background: var(--color-control);
    color: var(--color-control-text);
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-mono);
    font-size: var(--text-2xs);
    font-weight: 700;
    cursor: pointer;
    min-height: var(--touch-target-xs);
  }

  .page--snake .game-controls__btn--sidebar:hover {
    background: var(--color-control-hover);
  }

  /* Sidebar: drawer overlay */
  .page--snake .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 80vw;
    max-width: 20rem;
    max-height: none;
    z-index: 40;
    background: var(--bg-elevated);
    transform: translateX(-100%);
    transition: transform var(--duration-normal) ease;
    box-shadow: var(--shadow-lg);
    overflow-y: auto;
    overflow-x: hidden;
    border: none;
    border-radius: 0;
    padding: 0;
    gap: 0;
    flex-direction: column;
    height: auto;
  }

  .page--snake .sidebar--open {
    transform: translateX(0);
  }

  /* Sidebar close button */
  .page--snake .sidebar__close-btn {
    width: var(--touch-target-sm);
    height: var(--touch-target-sm);
    background: transparent;
    border: none;
    color: var(--color-text-bright);
    cursor: pointer;
    border-radius: var(--radius-md);
    flex-shrink: 0;
  }

  .page--snake .sidebar__close-btn:hover {
    background: rgba(255, 255, 255, 0.1);
  }

  /* Sidebar header layout */
  .page--snake .sidebar__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
  }

  .page--snake .sidebar__header-left {
    display: flex;
    flex-direction: column;
  }

  /* Sidebar categories: restore column layout */
  .page--snake .sidebar__categories {
    flex-direction: column;
    gap: var(--space-lg);
    padding: var(--space-md);
  }

  .page--snake .sidebar__category-items {
    flex-direction: column;
  }

  .page--snake .sidebar__category {
    flex-shrink: 1;
  }

  /* Sidebar backdrop */
  .page--snake .sidebar-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    background: var(--color-overlay);
    z-index: 39;
    backdrop-filter: blur(var(--backdrop-blur-amount));
  }

  .page--snake .sidebar-backdrop[hidden] {
    display: none;
  }

  /* Workspace: full width, no extra padding */
  .page--snake .workspace {
    height: auto;
    min-height: 18rem;
    position: static;
    border-left: none;
    border-right: none;
    border-radius: 0;
  }

  .page--snake .workspace__area {
    padding: var(--space-sm);
    padding-right: 0;
  }

  .page--snake .workspace__stack {
    min-height: 20rem;
  }

  .page--snake .stage {
    border-left: none;
    border-bottom: 2px solid var(--border-dark);
    border-radius: 0;
    overflow: hidden;
  }

  .page--snake .stage__body {
    padding: var(--space-sm);
    overflow: hidden;
    min-height: calc(var(--grid-max-width-mobile) + var(--space-sm) * 2 + 1rem);
  }

  /* Snake page padding adjustments */
  .page--snake {
    padding-top: calc(var(--layout-header-height) + var(--space-sm));
    padding-bottom: var(--layout-nav-height);
  }

  /* Hide desktop objective card on mobile */
  .page--snake .level-objective-card {
    display: none;
  }

  /* Show objective button only on mobile */
  .page--snake .header-btn--objective {
    display: inline-flex;
  }
}

/* ---- Rules Modal ---- */
.page--snake .modal--rules {
  max-width: 28rem;
}

.page--snake .modal--objective {
  max-width: 22rem;
}

.page--snake .objective-modal__icon {
  vertical-align: middle;
  margin-right: var(--space-2xs);
}

.page--snake .modal__close-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  width: 2rem;
  height: 2rem;
  border-radius: var(--radius-full);
  border: none;
  background: var(--bg-grid-line);
  color: var(--color-text);
  font-size: 0.875rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
  line-height: 1;
}

.page--snake .modal__close-btn:hover {
  background: var(--color-apple);
  color: var(--color-danger-text);
}

.page--snake .rules-content {
  max-height: 60vh;
  overflow-y: auto;
}

.page--snake .rules-grid {
  display: grid;
  gap: var(--space-md);
  grid-template-columns: 1fr;
}

.page--snake .rules-card {
  background: var(--bg-grid-line);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-md);
  padding: var(--space-md);
}

.page--snake .rules-card h4 {
  font-family: var(--font-mono);
  font-size: var(--text-sm-md);
  font-weight: 700;
  color: var(--color-text);
  margin: 0 0 var(--space-sm) 0;
}

.page--snake .rules-card p {
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  color: var(--color-text-subtle);
  line-height: 1.5;
  margin: 0;
}

[data-theme="light"] .page--snake .rules-card p {
  color: var(--color-dark);
}

.page--snake .rules-card--full {
  grid-column: 1 / -1;
}

@media (min-width: var(--breakpoint-sm)) {
  .page--snake .rules-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: var(--breakpoint-md)) {
  .page--snake .modal.modal--rules {
    max-width: 48rem;
  }

  .page--snake .rules-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page--snake .rules-card--full {
    grid-column: 1 / -1;
  }
}

/* Account for fixed TopAppBar and BottomNav height */
.page--snake {
  padding-top: calc(var(--layout-header-height) + var(--space-md));
  padding-bottom: var(--layout-nav-height);
}

/* Inner content wrapper - flex column so app-container fills remaining space */
.page--snake__content {
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow: hidden;
}

/* Inner content wrapper — flex column so app-container fills remaining space */
.page--snake > div {
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow: hidden;
}

/* ---- Access Denied ---- */
.page--snake .access-denied {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 1;
  padding: var(--space-lg);
}

.page--snake .access-denied__card {
  background: var(--color-surface);
  border: var(--border-width-thin) solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  max-width: var(--modal-max-width);
  width: 100%;
  text-align: center;
  box-shadow: var(--shadow-hard);
}

.page--snake .access-denied__icon {
  margin-bottom: var(--space-md);
}

.page--snake .access-denied__icon-symbol {
  font-size: var(--icon-xl);
  color: var(--color-error);
  font-variation-settings: 'FILL' 1;
}

.page--snake .access-denied__title {
  font-family: var(--font-headline);
  font-size: var(--text-lg);
  font-weight: var(--font-weight-headline);
  color: var(--color-text);
  margin-bottom: var(--space-sm);
  line-height: var(--leading-tight);
}

.page--snake .access-denied__subtitle {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  color: var(--color-text-subtle);
  margin-bottom: var(--space-lg);
  line-height: var(--leading-normal);
}

.page--snake .access-denied__actions {
  display: flex;
  gap: var(--space-md);
  justify-content: center;
}

.page--snake .access-denied__btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-md);
  font-family: var(--font-headline);
  font-size: var(--text-sm-md);
  font-weight: var(--font-weight-headline);
  text-decoration: none;
  cursor: pointer;
  transition: transform var(--duration-instant);
  min-height: var(--touch-target-min);
  border: var(--border-width-thin) solid transparent;
  border-bottom: var(--border-width-game) solid transparent;
}

.page--snake .access-denied__btn:active {
  transform: translateY(var(--button-active-offset));
  border-bottom-width: var(--button-active-offset);
}

.page--snake .access-denied__btn--primary {
  background: var(--color-secondary);
  color: var(--color-on-secondary);
  border-bottom-color: var(--color-dark);
}

.page--snake .access-denied__btn--secondary {
  background: transparent;
  color: var(--color-text);
  border-color: var(--color-border);
  border-bottom-color: var(--color-border);
}

/* =============================================
   Stage Wrapper - Contains stage, controls, info, and objective card
   ============================================= */
.page--snake .stage-wrapper {
  display: flex;
  flex-direction: column;
  gap: 0;
}

/* ---- Stage Header ---- */
.page--snake .stage__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-md);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-dark);
}

.page--snake .stage__title {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-text-subtle);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

[data-theme="light"] .page--snake .stage__title {
  color: var(--color-dark);
}

.page--snake .stage__stars {
  display: flex;
  gap: 0.125rem;
  align-items: center;
}

.page--snake .stage__stars .star {
  font-size: 1rem;
  line-height: 1;
  transition: color 0.2s ease, text-shadow 0.2s ease;
}

.page--snake .stage__stars .star--lit {
  color: var(--color-executing);
  text-shadow: 0 0 0.5rem var(--color-executing-glow);
}

.page--snake .stage__stars .star--empty {
  color: var(--color-text-ghost);
}

.page--snake .stage__level {
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  color: var(--color-text-dim);
  background: rgba(0, 0, 0, 0.3);
  padding: 0.125rem 0.5rem;
  border-radius: var(--radius-sm);
}

/* ---- Stage Footer ---- */
.page--snake .stage__footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-sm) var(--space-md);
  background: var(--bg-surface);
  border-top: 1px solid var(--border-dark);
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  color: var(--color-text-subtle);
}

[data-theme="light"] .page--snake .stage__footer {
  color: var(--color-dark);
}

.page--snake .stage__apple-counter {
  color: var(--color-apple);
  font-weight: 700;
}

.page--snake .stage__status {
  color: var(--color-executing);
  font-weight: 700;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.page--snake .stage__status::before {
  content: '';
  display: inline-block;
  width: 0.5rem;
  height: 0.5rem;
  background: var(--color-executing);
  border-radius: var(--radius-full);
}

/* All 3 buttons same size */
.page--snake .header-btn--run,
.page--snake .header-btn--pause {
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease, box-shadow 0.2s ease;
}

/*
.page--snake .header-btn--stop {
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease, box-shadow 0.2s ease;
}
*/

/* Run button - primary style with glow (circular) */
.page--snake .header-btn--run {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-full);
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease, box-shadow 0.2s ease;
  background: var(--color-run);
  box-shadow: 0 0 1rem var(--color-executing-glow);
  border: none;
}

.page--snake .header-btn--run:hover:not(:disabled) {
  background: var(--color-run-hover);
  box-shadow: 0 0 1.5rem var(--color-executing-glow);
}

.page--snake .header-btn--run img {
  width: 1.25rem;
  height: 1.25rem;
  filter: brightness(0);
}

/* Pause - secondary style (rounded square) */
.page--snake .header-btn--pause {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-md);
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease, box-shadow 0.2s ease;
}

/*
.page--snake .header-btn--stop {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-md);
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s ease, box-shadow 0.2s ease;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: none;
}
*/

.page--snake .header-btn--pause:hover:not(:disabled) {
  background: var(--color-pause-hover);
}

/*
.page--snake .header-btn--stop:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.15);
}
*/

.page--snake .header-btn--pause img {
  width: 1.25rem;
  height: 1.25rem;
  filter: brightness(0) invert(1);
}

/* ---- Level Objective Card (Desktop) ---- */
[data-theme="light"] .page--snake .header-btn--pause img {
  filter: brightness(0);
}

/*
.page--snake .header-btn--stop img {
  width: 1.25rem;
  height: 1.25rem;
  filter: brightness(0) invert(1);
}
*/

/* ---- Workspace Counters ---- */
.page--snake .workspace__counters {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-2xs) var(--space-sm);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-md);
  justify-self: center;
}

.page--snake .block-counter {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-text-subtle);
  white-space: nowrap;
  transition: color var(--duration-normal) ease;
}

.page--snake .block-counter--limit {
  color: var(--color-apple);
  animation: snakePulseLimit var(--duration-slow) ease-in-out 3;
}

.page--snake .loop-counter {
  color: var(--color-text-muted);
  font-weight: 700;
}

/* ---- Level Objective Card ---- */
.page--snake .level-objective-card {
  position: absolute;
  top: 5.5rem;
  right: var(--space-md);
  width: 18rem;
  max-width: 20rem;
  z-index: 10;
  background: var(--color-surface-modal);
  border-radius: var(--radius-lg);
  padding: var(--space-md);
  border: 1px solid var(--color-card-border);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.page--snake .level-objective-card__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--space-sm);
}

.page--snake .level-objective-card__title {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-card-text-title);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.page--snake .level-objective-card__icon {
  width: 1.5rem;
  height: 1.5rem;
  color: var(--color-card-icon);
}

.page--snake .level-objective-card__description {
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  color: var(--color-card-text-body);
  line-height: 1.6;
}

/* ---- Workspace Counters ---- */
.page--snake .workspace__counters {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-2xs) var(--space-sm);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-md);
}

.page--snake .block-counter {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-text-subtle);
  white-space: nowrap;
  transition: color var(--duration-normal) ease;
}

.page--snake .block-counter--limit {
  color: var(--color-apple);
  animation: snakePulseLimit var(--duration-slow) ease-in-out 3;
}

.page--snake .loop-counter {
  color: var(--color-text-muted);
  font-weight: 700;
}

/* ---- Level Objective Card ---- */
.page--snake .level-objective-card__description {
  font-family: var(--font-ui);
  font-size: var(--text-sm);
  color: var(--color-card-text-body);
  line-height: 1.6;
}

[data-theme="light"] .page--snake .level-objective-card__description {
  color: var(--color-dark);
}

/* ---- Workspace Rules Button ---- */
.page--snake .workspace__rules-btn {
  background: var(--color-primary);
  color: #ffffff;
  border: none;
  border-bottom: 2px solid var(--color-primary-dark);
  border-radius: var(--radius-md);
  padding: var(--space-2xs) var(--space-between);
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  min-height: var(--touch-target-sm);
  transition: background var(--duration-fast);
}

[data-theme="light"] .page--snake .workspace__rules-btn {
  color: var(--color-dark);
}

.page--snake .workspace__rules-btn:hover {
  background: var(--color-primary-dark);
}