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

/**
 * SpaceShooterAssetPack: `assets/SpaceShooterAssetPack_BackGrounds.png` (386×513),
 * `assets/SpaceShooterAssetPack_IU.png` (198×112, 9×22px × 7×16px cells, rendered 2× for UI).
 */
:root {
  --font-ui: 'VT323', ui-monospace, monospace;
  --bg-stars: url('assets/SpaceShooterAssetPack_BackGrounds.png');
  --ui-tiles: url('assets/SpaceShooterAssetPack_IU.png');
  --ui-sheet-w: 396px;
  --ui-sheet-h: 224px;
  --pack-blue: #5da2f0;
  --pack-orange: #f28e2b;
  --pack-dark: #0d1628;
  /** Orange button row (row 4), caps cols 5–7 — see tileset */
  --btn-row-y: -128px;
  --btn-cap-left: -220px var(--btn-row-y);
  --btn-mid-x: -264px var(--btn-row-y);
  --btn-cap-right: -308px var(--btn-row-y);
  /** Progress track / fill (bar strip region, rows 3–4) */
  --bar-track-y: -96px;
  --bar-fill-y: -112px;
  /** In-game HUD only (`#hud`); menu keeps classic pack colours */
  --hud-neon-cyan: #5de8ff;
  --hud-neon-magenta: #ff3da8;
  --hud-neon-amber: #ffc14f;
  --hud-panel-face: rgba(4, 10, 26, 0.9);
  /** In-game HUD: flat fills + offset shadows (8-bit chrome) */
  --hud-8bit-face: rgba(6, 14, 30, 0.97);
  --hud-8bit-border: rgba(72, 220, 255, 0.92);
  --hud-8bit-shadow: 4px 4px 0 rgba(0, 0, 0, 0.58);
  --hud-8bit-shadow-inset: inset 0 -3px 0 rgba(0, 0, 0, 0.35);
  /** Set from `VisualSettings` via `applyVisualSettingsToDom` (fallbacks for first paint) */
  --vs-hud-panel-glow:
    0 0 12px rgba(93, 232, 255, 0.28),
    0 0 28px rgba(255, 61, 168, 0.14),
    inset 0 0 20px rgba(93, 232, 255, 0.06);
  --vs-hud-panel-glow-menu:
    0 0 10px rgba(93, 162, 240, 0.22),
    0 0 22px rgba(242, 142, 43, 0.1),
    inset 0 0 16px rgba(93, 162, 240, 0.05);
  --vs-btn-glitch-duration: 4.6s;
  /** CRT starfield wobble — overridden by `applyVisualSettingsToDom` */
  --vs-crt-bg-wobble: 1;
  --crt-bg-drift-duration: 26s;
  --crt-bg-wobble-duration: 12s;
  --crt-bg-grain-drift-duration: 26s;
  --crt-bg-grain-opacity: 0.038;
  /** Star tile width vs positioning area; height is `auto` so the bitmap is not axis-stretched. */
  --bg-stars-tile-w: 300%;
}

html,
body {
  margin: 0;
  height: 100%;
  overflow: hidden;
  font-family: var(--font-ui);
  font-size: 22px;
  background: #0e1c2e;
  color: #e8f0ff;
  -webkit-font-smoothing: none;
  -moz-osx-font-smoothing: auto;
}

#app {
  position: relative;
  width: 100vw;
  height: 100vh;
  isolation: isolate;
}

/**
 * Starfield: one uniform zoom (`--bg-stars-tile-w` + `auto` height) so stars keep pixel aspect;
 * `repeat` fills the viewport — ultrawide gets more tiles, not a wider squash of one image.
 */
#app::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: -1;
  background-color: #0e1c2e;
  background-image:
    var(--bg-stars),
    repeating-linear-gradient(
      90deg,
      transparent 0,
      transparent 5px,
      rgba(200, 220, 255, var(--crt-bg-grain-opacity)) 5px,
      rgba(200, 220, 255, var(--crt-bg-grain-opacity)) 6px
    );
  background-repeat: repeat, repeat;
  background-size:
    var(--bg-stars-tile-w) auto,
    96px 8px;
  background-position: 0 0, 0 0;
  background-blend-mode: normal, soft-light;
  image-rendering: pixelated;
  image-rendering: crisp-edges;
  transform: translate3d(0, 0, 0);
  contain: paint;
  /** Hint compositor: transform wobble + merged opacity pulse in drift keyframes. */
  will-change: transform, opacity;
}

/**
 * Two animations only: (1) drift + grain + tiny opacity pulse merged — no animated filter;
 * (2) transform wobble. Avoids full-viewport filter repaints from the old “breathe” pass.
 */
html:not(.vs-crt-bg-wobble-off) #app::before {
  animation:
    crt-bg-drift-grain var(--crt-bg-drift-duration) ease-in-out infinite alternate,
    crt-bg-wobble var(--crt-bg-wobble-duration) ease-in-out infinite;
}

@media (prefers-reduced-motion: reduce) {
  html:not(.vs-crt-bg-wobble-off) #app::before {
    animation: none !important;
    opacity: 1 !important;
    will-change: auto;
  }
}

@keyframes crt-bg-drift-grain {
  0% {
    background-position:
      0 0,
      0 0;
    opacity: 1;
  }

  50% {
    opacity: 0.985;
  }

  100% {
    background-position:
      1.1% 0.75%,
      64px 12px;
    opacity: 1;
  }
}

@keyframes crt-bg-wobble {
  0%,
  100% {
    transform: translate3d(0, 0, 0) rotate(0deg);
  }

  22% {
    transform: translate3d(0.4px, -0.28px, 0) rotate(0.018deg);
  }

  48% {
    transform: translate3d(-0.22px, 0.18px, 0) rotate(-0.012deg);
  }

  71% {
    transform: translate3d(0.16px, 0.32px, 0) rotate(0.009deg);
  }
}

#game-canvas {
  display: block;
  width: 100%;
  height: 100%;
  outline: none;
  position: relative;
  z-index: 0;
  /* Backing store may be below CSS size — smooth upscale only (no full-canvas blur: too expensive). */
  image-rendering: auto;
  image-rendering: smooth;
}

#ui-root {
  position: absolute;
  inset: 0;
  z-index: 10;
  pointer-events: none;
  background: transparent;
}

/** During play, force the menu overlay off so the WebGL view is never covered by the start screen. */
#app.app--playing #screen-menu {
  display: none !important;
  visibility: hidden;
  pointer-events: none;
}

#ui-root .screen,
#ui-root .dev-bypass-wrap,
#ui-root .loading-overlay,
#ui-root .menu-actions,
#ui-root .music-mute,
#ui-root .btn-mute-wrap,
#ui-root button {
  pointer-events: auto;
  touch-action: manipulation;
}

.screen {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 2rem;
  text-align: center;
  background: rgba(9, 24, 51, 0.62);
  backdrop-filter: blur(4px);
}

.screen[hidden] {
  display: none !important;
}

.screen--visible {
  display: flex;
}

.screen h1,
.screen h2 {
  margin: 0 0 0.75rem;
  font-weight: 400;
  letter-spacing: 0.04em;
}

.screen h1 {
  font-size: clamp(2rem, 5vw, 2.75rem);
  color: var(--pack-blue);
  text-shadow:
    2px 2px 0 var(--pack-dark),
    -1px -1px 0 rgba(255, 255, 255, 0.08);
}

.screen h2 {
  font-size: 1.75rem;
  color: var(--pack-orange);
  text-shadow: 2px 2px 0 var(--pack-dark);
}

/** Framed like `.hud-panel` (legend / score); shares those rules via dual class. */
.menu-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  max-width: min(28rem, 100%);
  box-sizing: border-box;
}

.menu-panel .menu-actions {
  margin-top: 0.25rem;
}

/** Start screen: corner mute (positioned on `#screen-menu`, not inside the card). */
.btn-mute-wrap--menu-corner {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-end;
}

#screen-menu .btn-mute-wrap--menu-corner {
  position: absolute;
  bottom: max(1rem, env(safe-area-inset-bottom, 0px));
  right: max(1rem, env(safe-area-inset-right, 0px));
  z-index: 2;
}

.btn-mute--menu-corner {
  padding: 0.2rem 0.28rem;
  min-width: 2.1ch;
  font-family: ui-monospace, monospace;
  font-size: 0.88rem;
  line-height: 1;
  letter-spacing: 0;
  text-transform: none;
}

.btn-mute-wrap {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-mute-wrap--hud {
  width: 100%;
}

/**
 * Cyberpunk tooltip: same language as HUD panels (magenta accent, cyan border glow).
 */
.btn-mute__tooltip {
  position: absolute;
  bottom: calc(100% + 0.38rem);
  left: 50%;
  transform: translateX(-50%);
  z-index: 5;
  padding: 0.28rem 0.55rem 0.32rem;
  font-family: var(--font-ui);
  font-size: clamp(0.65rem, 0.35rem + 0.85vw, 0.82rem);
  line-height: 1.15;
  letter-spacing: 0.05em;
  text-transform: none;
  white-space: nowrap;
  color: var(--hud-neon-magenta, #ff3da8);
  text-shadow:
    0 0 8px rgba(255, 61, 168, 0.42),
    0 0 2px rgba(0, 0, 0, 0.75);
  pointer-events: none;
  opacity: 0;
  visibility: hidden;
  transition:
    opacity 0.12s ease,
    visibility 0.12s ease;
  background: linear-gradient(
    165deg,
    rgba(18, 36, 62, 0.96) 0%,
    rgba(6, 12, 28, 0.98) 45%,
    rgba(12, 8, 32, 0.95) 100%
  );
  border: 1px solid rgba(255, 61, 168, 0.55);
  border-left: 3px solid var(--hud-neon-magenta, #ff3da8);
  box-shadow:
    0 0 14px rgba(255, 61, 168, 0.2),
    0 0 3px rgba(255, 61, 168, 0.35),
    inset 0 1px 0 rgba(255, 255, 255, 0.07),
    inset 0 -1px 0 rgba(0, 0, 0, 0.35),
    4px 4px 0 rgba(0, 0, 0, 0.45);
}

.btn-mute-wrap:hover .btn-mute__tooltip,
.btn-mute-wrap:focus-within .btn-mute__tooltip {
  opacity: 1;
  visibility: visible;
}

#hud .btn-mute__tooltip {
  font-size: 1em;
}

/** HUD: music mute — icon only (no panel frame; see `#hud .music-mute--hud.hud-panel`). */
.music-mute {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: center;
  margin-top: 0.65rem;
  width: 100%;
  box-sizing: border-box;
}

.music-mute--hud {
  margin-top: 0;
}

/** Flat control inside panel borders (matches HUD legend / box treatment). */
.btn-mute {
  cursor: pointer;
  font-family: var(--font-ui);
  font-size: 1.05rem;
  line-height: 1.2;
  letter-spacing: 0.05em;
  text-transform: lowercase;
  margin: 0;
  padding: 0.12rem 0.2rem;
  border: none;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  image-rendering: pixelated;
  color: var(--hud-neon-magenta, #ff3da8);
  text-shadow:
    0 0 8px rgba(255, 61, 168, 0.35),
    0 0 2px rgba(0, 0, 0, 0.75);
}

.btn-mute:hover {
  filter: brightness(1.1);
  color: #ffe8f4;
}

.btn-mute:focus-visible {
  outline: 2px solid var(--hud-neon-magenta, #ff3da8);
  outline-offset: 2px;
}

#hud .btn-mute {
  background: var(--hud-8bit-face);
  border: 2px solid var(--hud-8bit-border);
  border-left-width: 3px;
  border-left-color: var(--hud-neon-magenta);
  padding: 0.14rem 0.28rem;
  box-shadow: var(--hud-8bit-shadow);
  text-shadow:
    2px 2px 0 rgba(0, 0, 0, 0.55),
    0 0 0 1px rgba(24, 0, 18, 0.4);
}

#hud .btn-mute:hover {
  filter: brightness(1.12);
}

.btn-mute__label {
  display: block;
  padding: 0;
  min-height: 0;
  min-width: 0;
  background: none;
  color: inherit;
  text-shadow: inherit;
}

/** Start screen: control rows centred as a block; action/key pairs stay centred in the panel. */
#screen-menu .keys {
  align-items: center;
  align-self: center;
  width: 100%;
  max-width: min(22rem, 100%);
}

#screen-menu .keys__line {
  justify-content: center;
  gap: 1.25rem;
  max-width: 20rem;
}

.menu-subtitle {
  margin: 0 0 0.5rem;
  font-size: 1.15rem;
  font-weight: 400;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--pack-orange);
}

.menu-build {
  margin: 1.25rem 0 0;
  font-size: 0.75rem;
  opacity: 0.55;
  max-width: 26rem;
  line-height: 1.35;
}

/** Sits under `.menu-build`; same scale as build line. */
.dev-mode-label {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  margin: 0.45rem 0 0;
  max-width: 26rem;
  font-size: 0.75rem;
  line-height: 1.35;
  opacity: 0.55;
  cursor: pointer;
  user-select: none;
}

/** Author `display: flex` above wins over the default `[hidden]` rule — match `.dev-bypass-wrap[hidden]`. */
.dev-mode-label[hidden] {
  display: none;
}

.dev-mode-label input {
  width: 1em;
  height: 1em;
  margin: 0;
  flex-shrink: 0;
  cursor: pointer;
  accent-color: var(--pack-blue);
}

.hint {
  margin: 0.25rem 0 1rem;
  max-width: 28rem;
  line-height: 1.35;
  opacity: 0.95;
  font-size: 1.05rem;
}

.marble-dead-actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  max-width: min(24rem, 100%);
}

.keys {
  margin: 0 0 1rem;
  font-size: 1rem;
  opacity: 0.88;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  align-self: stretch;
  width: 100%;
  box-sizing: border-box;
  gap: 0.2rem;
  line-height: 1.35;
  max-width: 100%;
}

.keys__line {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  width: 100%;
  box-sizing: border-box;
}

.keys__action {
  flex: 0 1 auto;
  text-align: left;
}

.keys__binding {
  flex: 0 0 auto;
  text-align: right;
}

/** Credits overlay (Markdown body in `#credits-body`; source `credits.md`). */
.credits-screen {
  z-index: 15;
  background: rgba(4, 12, 28, 0.78);
  backdrop-filter: blur(5px);
}

.credits-panel.menu-panel {
  align-items: stretch;
  max-width: min(32rem, 94vw);
  padding: 1.35rem 1.4rem 1.2rem;
  border-radius: 2px;
  border: 1px solid rgba(93, 232, 255, 0.5);
  background: linear-gradient(
    165deg,
    rgba(18, 36, 62, 0.96) 0%,
    rgba(6, 12, 28, 0.98) 45%,
    rgba(12, 8, 32, 0.95) 100%
  );
  box-shadow:
    0 0 18px rgba(93, 232, 255, 0.2),
    0 0 8px rgba(255, 61, 168, 0.12),
    inset 0 1px 0 rgba(255, 255, 255, 0.08),
    4px 4px 0 rgba(0, 0, 0, 0.5);
}

.credits-panel__body {
  text-align: left;
  width: 100%;
  max-height: min(58vh, 24rem);
  overflow-y: auto;
  overflow-x: hidden;
  margin: 0 0 1rem;
  padding-right: 0.35rem;
  font-size: 1.05rem;
  line-height: 1.45;
  color: #e8f0ff;
}

/** Beat `.screen h2` (orange) for Markdown-rendered headings inside the credits card. */
.credits-screen .credits-panel__h2 {
  margin: 0 0 0.65rem;
  font-size: clamp(1.45rem, 4vw, 1.85rem);
  font-weight: 400;
  letter-spacing: 0.04em;
  color: var(--pack-blue);
  text-shadow:
    2px 2px 0 var(--pack-dark),
    -1px -1px 0 rgba(255, 255, 255, 0.06);
}

.credits-screen .credits-panel__h3 {
  margin: 0.95rem 0 0.4rem;
  font-size: 1.18rem;
  font-weight: 400;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--pack-orange);
  text-shadow: 1px 1px 0 var(--pack-dark);
}

.credits-screen .credits-panel__h3:first-of-type {
  margin-top: 0.35rem;
}

.credits-screen .credits-panel__h4 {
  margin: 0.75rem 0 0.35rem;
  font-size: 1.05rem;
  font-weight: 400;
  color: var(--pack-blue);
  text-shadow: 1px 1px 0 var(--pack-dark);
}

.credits-panel__p {
  margin: 0 0 0.6rem;
}

.credits-panel__p:last-child {
  margin-bottom: 0;
}

.credits-panel__p--error {
  color: #ff9eb0;
}

.credits-panel__ul {
  margin: 0 0 0.6rem 1.15rem;
  padding: 0;
  list-style: square;
}

.credits-panel__li {
  margin: 0.25rem 0;
}

.credits-panel__a {
  color: var(--hud-neon-cyan);
  text-decoration: underline;
  text-underline-offset: 0.15em;
}

.credits-panel__a:hover {
  color: #e8fbff;
}

.credits-panel__strong {
  font-weight: 400;
  color: #f4f8ff;
  text-shadow: 0 0 10px rgba(93, 232, 255, 0.28);
}

.credits-panel__close {
  align-self: center;
}

/**
 * Primary actions: cyberpunk panel (replaces sprite strip). Tune glow via `VisualSettings` CSS vars.
 */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  margin: 0;
  border: none;
  cursor: pointer;
  font-family: var(--font-ui);
  font-size: 1.28rem;
  line-height: 1.2;
  image-rendering: pixelated;
  background: transparent;
}

.btn-primary.btn-primary--cyber {
  padding: 0.48rem 1.35rem;
  border-radius: 2px;
  border: 1px solid rgba(255, 61, 168, 0.55);
  background: linear-gradient(
    165deg,
    rgba(18, 36, 62, 0.97) 0%,
    rgba(6, 12, 28, 0.98) 45%,
    rgba(12, 8, 32, 0.96) 100%
  );
  box-shadow:
    0 0 14px rgba(255, 61, 168, 0.22),
    0 0 4px rgba(255, 61, 168, 0.45),
    inset 0 1px 0 rgba(255, 255, 255, 0.1),
    inset 0 -1px 0 rgba(0, 0, 0, 0.45),
    4px 4px 0 rgba(0, 0, 0, 0.5);
  color: var(--hud-neon-magenta, #ff3da8);
  text-shadow:
    0 0 10px rgba(255, 61, 168, 0.45),
    0 0 2px rgba(0, 0, 0, 0.8);
  text-transform: lowercase;
  letter-spacing: 0.06em;
  transform: translate3d(0, 0, 0);
}

.btn-primary.btn-primary--cyber:hover {
  filter: brightness(1.08);
  border-color: rgba(255, 200, 230, 0.72);
  color: #ffe8f4;
}

.btn-primary.btn-primary--cyber:focus-visible {
  outline: 2px solid var(--hud-neon-magenta, #ff3da8);
  outline-offset: 3px;
}

/** Menu “new game”, out-of-bounds “try again”, run-over “main menu”: classic cyan label. */
#btn-new-game.btn-primary--cyber,
#btn-try-again.btn-primary--cyber,
#btn-run-menu.btn-primary--cyber {
  border: 1px solid rgba(93, 232, 255, 0.55);
  box-shadow:
    0 0 14px rgba(93, 232, 255, 0.22),
    0 0 4px rgba(93, 232, 255, 0.45),
    inset 0 1px 0 rgba(255, 255, 255, 0.1),
    inset 0 -1px 0 rgba(0, 0, 0, 0.45),
    4px 4px 0 rgba(0, 0, 0, 0.5);
  color: var(--hud-neon-cyan, #5de8ff);
  text-shadow:
    0 0 10px rgba(93, 232, 255, 0.45),
    0 0 2px rgba(0, 0, 0, 0.8);
}

#btn-new-game.btn-primary--cyber:hover,
#btn-try-again.btn-primary--cyber:hover,
#btn-run-menu.btn-primary--cyber:hover {
  border-color: rgba(255, 61, 168, 0.65);
  color: #e8fbff;
}

.btn-primary__label {
  display: block;
  padding: 0;
  min-height: 0;
  min-width: 0;
  background: none;
  color: inherit;
  text-shadow: inherit;
}

/** Glitch bursts on selected primary buttons (enable via `html.vs-btn-glitch`). */
@keyframes btn-cyber-glitch {
  0%,
  91%,
  91.4%,
  100% {
    transform: translate3d(0, 0, 0) skewX(0deg);
    filter: hue-rotate(0deg);
  }

  91.15% {
    transform: translate3d(-3px, 1px, 0) skewX(-1deg);
    filter: hue-rotate(12deg);
  }

  91.25% {
    transform: translate3d(2px, -1px, 0) skewX(0.7deg);
    filter: hue-rotate(-10deg);
  }

  91.32% {
    transform: translate3d(0, 0, 0) skewX(0deg);
    filter: hue-rotate(0deg);
  }
}

html.vs-btn-glitch .btn-primary--glitch.btn-primary--cyber {
  animation: btn-cyber-glitch var(--vs-btn-glitch-duration, 4.6s) steps(1, end) infinite;
}

@media (prefers-reduced-motion: reduce) {
  html.vs-btn-glitch .btn-primary--glitch.btn-primary--cyber {
    animation: none;
  }
}

/**
 * Start title: bold + layered glow (“blur”), extra glitch bursts vs {@link btn-cyber-glitch}.
 * Gated by `html.vs-btn-glitch` (see {@link applyVisualSettingsToDom}).
 */
@keyframes menu-title-cyber-glitch {
  0%,
  22.85%,
  23.25%,
  55.45%,
  55.88%,
  87.92%,
  88.35%,
  90.92%,
  91.38%,
  100% {
    transform: translate3d(0, 0, 0) skewX(0deg);
    filter: hue-rotate(0deg);
  }

  23.05% {
    transform: translate3d(2px, -1px, 0) skewX(0.85deg);
    filter: hue-rotate(-9deg);
  }

  23.12% {
    transform: translate3d(-1px, 1px, 0) skewX(-0.4deg);
    filter: hue-rotate(6deg);
  }

  55.65% {
    transform: translate3d(-2px, 1px, 0) skewX(-0.75deg);
    filter: hue-rotate(10deg);
  }

  55.72% {
    transform: translate3d(1px, 0, 0) skewX(0.5deg);
    filter: hue-rotate(-5deg);
  }

  88.08% {
    transform: translate3d(1px, -1px, 0) skewX(0.55deg);
    filter: hue-rotate(7deg);
  }

  91.15% {
    transform: translate3d(-3px, 1px, 0) skewX(-1deg);
    filter: hue-rotate(12deg);
  }

  91.25% {
    transform: translate3d(2px, -1px, 0) skewX(0.7deg);
    filter: hue-rotate(-10deg);
  }

  91.32% {
    transform: translate3d(0, 0, 0) skewX(0deg);
    filter: hue-rotate(0deg);
  }
}

#menu-heading.menu-heading--glitch {
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: lowercase;
  color: var(--hud-neon-cyan, #5de8ff);
  text-shadow:
    0 0 18px rgba(93, 232, 255, 0.55),
    0 0 36px rgba(93, 232, 255, 0.28),
    0 0 3px rgba(93, 232, 255, 0.95),
    2px 2px 0 var(--pack-dark),
    -2px 0 0 rgba(255, 61, 168, 0.42),
    2px 0 0 rgba(0, 217, 255, 0.32),
    -1px -1px 0 rgba(255, 255, 255, 0.06);
  transform: translate3d(0, 0, 0);
}

html.vs-btn-glitch #menu-heading.menu-heading--glitch {
  animation: menu-title-cyber-glitch var(--vs-btn-glitch-duration, 4.6s) steps(1, end) infinite;
}

@media (prefers-reduced-motion: reduce) {
  html.vs-btn-glitch #menu-heading.menu-heading--glitch {
    animation: none;
  }
}

.menu-actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

/**
 * Sits under the HUD mute control (see `.hud-stack-right`); no longer absolutely positioned.
 */
.dev-bypass-wrap {
  position: relative;
  z-index: 2;
}

#hud .btn-dev {
  font-size: 1em;
  padding: clamp(0.22rem, 0.08rem + 0.55vw, 0.35rem) clamp(0.45rem, 0.15rem + 0.85vw, 0.75rem);
}

.dev-bypass-wrap[hidden] {
  display: none !important;
}

.btn-dev {
  cursor: pointer;
  border: 2px solid var(--hud-neon-magenta, #ff3da8);
  padding: 0.35rem 0.75rem;
  font-family: var(--font-ui);
  font-size: 1rem;
  color: var(--hud-neon-magenta, #ff3da8);
  background: rgba(13, 22, 40, 0.85);
  image-rendering: pixelated;
  box-shadow: 2px 2px 0 var(--pack-dark);
  text-shadow:
    0 0 8px rgba(255, 61, 168, 0.35),
    0 0 1px rgba(0, 0, 0, 0.75);
}

.btn-dev:hover {
  background: rgba(255, 61, 168, 0.18);
  color: #ffe8f4;
}

.btn-dev:focus-visible {
  outline: 2px solid var(--pack-orange);
  outline-offset: 2px;
}

.hud {
  position: absolute;
  top: 1rem;
  left: 1rem;
  right: 1rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: start;
  gap: 0.75rem;
  font-size: 1.05rem;
  image-rendering: pixelated;
  pointer-events: none;
}

/**
 * Fluid type + spacing so legend, centre titles, and mute stay within the grid on small viewports.
 * Child sizes use `em` where overridden so they track this root.
 */
#hud.hud {
  --hud-pad-inline: clamp(0.35rem, 0.15rem + 1.1vw, 0.65rem);
  --hud-pad-block: clamp(0.28rem, 0.1rem + 0.85vw, 0.5rem);
  font-size: clamp(0.65rem, 0.24rem + 1.38vw, 1.08rem);
  gap: clamp(0.35rem, 0.15rem + 1.5vw, 0.75rem);
  --hud-centre-scale: 1.16;
  font-family: var(--font-ui);
  text-rendering: geometricPrecision;
  -webkit-font-smoothing: none;
}

.hud-panel {
  padding: 0.35rem 0.9rem;
  border-radius: 2px;
  background: rgba(13, 22, 40, 0.82);
  border: 2px solid var(--pack-blue);
  box-shadow:
    3px 3px 0 rgba(0, 0, 0, 0.35),
    var(--vs-hud-panel-glow-menu);
}

.menu-panel.hud-panel {
  padding: 0.85rem 1.1rem 1rem;
  box-shadow:
    3px 3px 0 rgba(0, 0, 0, 0.35),
    var(--vs-hud-panel-glow-menu);
}

.hud-legend {
  grid-column: 1;
  justify-self: start;
  text-align: left;
  font-size: 0.95rem;
  line-height: 1.4;
  max-width: min(16rem, 100%);
  color: var(--pack-orange);
}

.hud-legend__line {
  display: block;
}

.hud-legend__line + .hud-legend__line {
  margin-top: 0.08rem;
}

.hud-centre {
  grid-column: 2;
  justify-self: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.1rem;
}

.hud-hfill {
  grid-column: 3;
  min-width: 0;
  display: flex;
  justify-content: flex-end;
  align-items: flex-start;
}

.hud-stack-right {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.55rem;
}

#hud .music-mute--hud {
  width: auto;
  max-width: min(18rem, 94vw);
  justify-content: flex-end;
}

#hud .music-mute--hud.hud-panel {
  padding: 0;
  border: none;
  border-left: none;
  background: transparent;
  box-shadow: none;
}

#hud .music-mute--hud.hud-panel::before {
  display: none;
}

#hud .music-mute--hud .btn-mute {
  font-size: 1em;
  line-height: 1.15;
  padding: clamp(0.06em, 0.02em + 0.25vw, 0.14em) clamp(0.1em, 0.04em + 0.35vw, 0.2em);
}

/** 8-bit style: flat panel, chunky offset shadow, magenta spine — scoped to `#hud` */
#hud .hud-panel {
  position: relative;
  border-radius: 0;
  padding: var(--hud-pad-block, 0.45rem) var(--hud-pad-inline, 1rem) calc(var(--hud-pad-block, 0.45rem) + 0.05rem);
  background: var(--hud-8bit-face);
  border: 2px solid var(--hud-8bit-border);
  border-left: 4px solid var(--hud-neon-magenta);
  box-shadow: var(--hud-8bit-shadow), var(--hud-8bit-shadow-inset);
}

#hud .hud-panel::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--hud-neon-cyan);
  opacity: 0.55;
  pointer-events: none;
}

#hud .hud-legend {
  align-self: stretch;
  width: 100%;
  max-width: min(15.5rem, min(100%, 38vw));
  font-size: 0.94em;
  line-height: 1.25;
  color: rgba(200, 248, 255, 0.95);
  letter-spacing: 0.06em;
  text-shadow:
    2px 2px 0 rgba(0, 0, 0, 0.65),
    0 0 0 1px rgba(0, 8, 20, 0.5);
}

#hud .hud-legend__line {
  display: flex;
  align-items: baseline;
  justify-content: flex-start;
  gap: clamp(0.18rem, 0.08rem + 0.55vw, 0.38rem);
  width: 100%;
}

#hud .hud-legend__icon {
  flex: 0 0 clamp(2.65ch, 2.1ch + 1.1vw, 3.5ch);
  width: clamp(2.65ch, 2.1ch + 1.1vw, 3.5ch);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-ui);
  font-size: 0.92em;
  line-height: 1.15;
  letter-spacing: 0;
  color: var(--hud-neon-magenta);
  text-shadow:
    2px 2px 0 rgba(0, 0, 0, 0.55),
    0 0 0 1px rgba(40, 0, 28, 0.45);
}

#hud .hud-legend__text {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  flex-direction: row;
  align-items: baseline;
  justify-content: space-between;
  gap: clamp(0.22rem, 0.08rem + 0.7vw, 0.45rem);
}

/** Matches start-screen pattern: bold action + normal keys; keys use a softer glow. */
#hud .hud-legend__action {
  flex: 0 1 auto;
  min-width: 0;
  text-align: left;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: rgba(200, 252, 255, 0.98);
  text-shadow:
    2px 2px 0 rgba(0, 0, 0, 0.6),
    0 0 0 1px rgba(0, 12, 24, 0.45);
}

#hud .hud-legend__keys {
  flex: 0 1 auto;
  min-width: 0;
  text-align: right;
  font-weight: 400;
  letter-spacing: 0.05em;
  opacity: 0.92;
  color: rgba(210, 242, 255, 0.94);
  text-shadow:
    1px 1px 0 rgba(0, 0, 0, 0.55),
    0 0 0 1px rgba(0, 10, 22, 0.4);
}

#hud .hud-centre {
  text-shadow: none;
  font-size: calc(1em * var(--hud-centre-scale, 1.16));
  padding-inline: calc(var(--hud-pad-inline, 0.55rem) * 1.15);
  padding-block: calc(var(--hud-pad-block, 0.35rem) * 1.12);
}

.hud-row {
  text-align: center;
}

.hud-row--title {
  color: var(--pack-blue);
}

.hud-row--coins {
  font-size: 0.95rem;
  opacity: 0.95;
  color: var(--pack-orange);
}

#hud .hud-row--title {
  color: var(--hud-neon-cyan);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-size: clamp(1.12rem, 0.78rem + 1.65vw, 1.88rem);
  line-height: 1.08;
  font-weight: 400;
  text-shadow:
    3px 3px 0 rgba(0, 0, 0, 0.62),
    0 0 0 1px rgba(0, 20, 36, 0.55);
}

#hud .hud-row--coins {
  font-size: 1.08em;
  color: var(--hud-neon-amber);
  opacity: 1;
  letter-spacing: 0.05em;
  text-shadow:
    2px 2px 0 rgba(0, 0, 0, 0.58),
    0 0 0 1px rgba(36, 20, 0, 0.45);
}

/** Narrower than the coins/run row (~⅔ width); spaced ASCII fall markers. */
#hud .hud-row--falls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(1em, 0.55em + 2.4vw, 1.45em);
  width: 66%;
  max-width: 100%;
  margin: 0.12em auto 0.38em;
  box-sizing: border-box;
  font-family: var(--font-ui);
  letter-spacing: 0.08em;
  line-height: 1;
}

#hud .hud-fall-char {
  display: inline-block;
  min-width: 1ch;
  text-align: center;
  font-size: 1.05em;
}

#hud .hud-fall-char--pending {
  font-weight: 400;
  color: rgba(28, 48, 64, 0.88);
  text-shadow: none;
}

#hud .hud-fall-char--spent {
  font-weight: 700;
  color: var(--hud-neon-magenta, #ff3da8);
  text-shadow:
    2px 2px 0 rgba(0, 0, 0, 0.6),
    0 0 0 1px rgba(32, 0, 24, 0.5);
  animation: hud-fall-glitch 3.2s steps(1, end) infinite;
}

#hud .hud-fall-char--terminal {
  font-weight: 700;
  color: var(--hud-neon-magenta, #ff3da8);
  text-shadow:
    2px 2px 0 rgba(0, 0, 0, 0.65),
    0 0 0 1px rgba(28, 0, 20, 0.55);
  animation: hud-fall-glitch 2.4s steps(1, end) infinite;
}

html.vs-hud-fall-glitch-off #hud .hud-fall-char--spent,
html.vs-hud-fall-glitch-off #hud .hud-fall-char--terminal {
  animation: none;
  transform: none;
  filter: none;
}

@keyframes hud-fall-glitch {
  0%,
  88%,
  88.4%,
  100% {
    transform: translate3d(0, 0, 0);
    filter: hue-rotate(0deg);
  }

  88.2% {
    transform: translate3d(-2px, 1px, 0);
    filter: hue-rotate(8deg);
  }

  88.28% {
    transform: translate3d(1px, -1px, 0);
    filter: hue-rotate(-6deg);
  }

  88.35% {
    transform: translate3d(0, 0, 0);
    filter: hue-rotate(0deg);
  }
}

@media (prefers-reduced-motion: reduce) {
  #hud .hud-fall-char--spent,
  #hud .hud-fall-char--terminal {
    animation: none;
  }
}

.run-over-actions {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.65rem;
  margin-top: 0.5rem;
}

.run-over-dev-actions {
  display: flex;
  justify-content: center;
  margin-top: 0.85rem;
  padding-top: 0.65rem;
  border-top: 1px solid rgba(255, 61, 168, 0.22);
  width: 100%;
  max-width: min(22rem, 100%);
}

/** Author `display: flex` above wins over the default `[hidden]` rule — match `.dev-bypass-wrap[hidden]`. */
.run-over-dev-actions[hidden] {
  display: none !important;
}

.hud-sep {
  margin: 0 0.35rem;
  opacity: 0.65;
}

#hud .hud-sep {
  color: var(--hud-neon-magenta);
  opacity: 0.65;
  text-shadow: 1px 1px 0 rgba(0, 0, 0, 0.5);
}

.level-complete-scores {
  margin: 0.35rem 0 0.75rem;
  font-size: 1.1rem;
  color: var(--pack-blue);
  white-space: pre-line;
  text-align: center;
}

.hud[hidden] {
  display: none;
}

/** Full-screen load: procgen + mesh build (see GameApplication._runLevelLoadFlow). */
.loading-overlay {
  position: absolute;
  inset: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
}

.loading-overlay__scrim {
  position: absolute;
  inset: 0;
  background: rgba(9, 24, 51, 0.72);
  backdrop-filter: blur(3px);
}

.loading-overlay__card {
  position: relative;
  z-index: 1;
  min-width: min(22rem, 90vw);
  padding: 1.5rem 1.35rem;
  border-radius: 2px;
  text-align: center;
  background: rgba(13, 22, 40, 0.88);
  border: 3px solid var(--pack-orange);
  box-shadow:
    4px 4px 0 var(--pack-dark),
    0 12px 40px rgba(0, 0, 0, 0.45),
    var(--vs-hud-panel-glow-menu);
  image-rendering: pixelated;
}

.loading-overlay__title {
  margin: 0 0 0.5rem;
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--pack-blue);
  text-shadow: 2px 2px 0 var(--pack-dark);
}

.loading-overlay__phase {
  margin: 0 0 0.85rem;
  min-height: 1.35rem;
  font-size: 1.05rem;
  color: var(--pack-orange);
}

.loading-overlay__card progress {
  width: 100%;
  height: 18px;
  vertical-align: middle;
  appearance: none;
  border: 2px solid var(--pack-dark);
  overflow: hidden;
  background-color: rgba(9, 24, 51, 0.9);
  background-image: var(--ui-tiles);
  background-size: var(--ui-sheet-w) var(--ui-sheet-h);
  background-position: 0 var(--bar-track-y);
  background-repeat: repeat-x;
  image-rendering: pixelated;
}

.loading-overlay__card progress::-webkit-progress-bar {
  background-color: transparent;
  background-image: var(--ui-tiles);
  background-size: var(--ui-sheet-w) var(--ui-sheet-h);
  background-position: 0 var(--bar-track-y);
  background-repeat: repeat-x;
}

.loading-overlay__card progress::-webkit-progress-value {
  background-color: var(--pack-orange);
  background-image: var(--ui-tiles);
  background-size: var(--ui-sheet-w) var(--ui-sheet-h);
  background-position: 0 var(--bar-fill-y);
  background-repeat: repeat-x;
}

/** Firefox: `::-moz-progress-bar` is the filled portion. */
.loading-overlay__card progress::-moz-progress-bar {
  background-color: var(--pack-orange);
  background-image: var(--ui-tiles);
  background-size: var(--ui-sheet-w) var(--ui-sheet-h);
  background-position: 0 var(--bar-fill-y);
  background-repeat: repeat-x;
}

.loading-overlay[hidden] {
  display: none !important;
}

.btn-primary:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  filter: grayscale(0.2);
}

/** Encore / Grove iframe: `body.embed` from `EmbedHost` */
body.embed .dev-mode-label {
  display: none;
}

body.embed .menu-build {
  display: none;
}