:root {
  --stage-edge: 0.5rem;
  --stage-edge-as-inline: 0.8888889rem;
  --stage-inset-block-start: max(var(--stage-edge), env(safe-area-inset-top));
  --stage-inset-block-end: max(var(--stage-edge), env(safe-area-inset-bottom));
  --stage-inset-inline-start: max(var(--stage-edge), env(safe-area-inset-left));
  --stage-inset-inline-end: max(var(--stage-edge), env(safe-area-inset-right));
  --stage-inline-size: min(
    calc(100vw - var(--stage-inset-inline-start) - var(--stage-inset-inline-end)),
    calc(
      177.777778svh
      - max(var(--stage-edge-as-inline), calc(env(safe-area-inset-top) + env(safe-area-inset-top)))
      - max(var(--stage-edge-as-inline), calc(env(safe-area-inset-bottom) + env(safe-area-inset-bottom)))
    ),
    100rem
  );
  color-scheme: dark;
  font-family: ui-rounded, "SF Pro Rounded", "PingFang SC", system-ui, sans-serif;
  background: #030817;
  color: #f4fbff;
}

html,
body,
button,
.game-shell,
.game-frame,
.game-frame::after,
#game-canvas,
.hud,
.hud-chip,
.controls,
.power-readout,
.overlay,
.result-grid,
.result-grid > div,
.portrait-hint,
.sr-only {
  box-sizing: border-box;
}

html,
body {
  min-block-size: 100%;
  margin: 0;
}

body {
  min-inline-size: 20rem;
  background:
    radial-gradient(circle at 50% 0%, rgb(58 43 142 / 52%), transparent 42rem),
    #030817;
  line-height: 1.5;
}

button {
  min-width: 48px;
  min-height: 48px;
  padding: 0.5rem 0.7rem;
  border: 1px solid rgb(116 239 255 / 70%);
  border-radius: 999rem;
  background: rgb(4 27 61 / 92%);
  color: inherit;
  font: inherit;
  font-size: 0.875rem;
  font-weight: 750;
  line-height: 1.15;
  touch-action: manipulation;
  transition: border-color 160ms ease, background-color 160ms ease, transform 160ms ease;
}

button:hover {
  border-color: #71f5ff;
  background: rgb(10 48 92 / 96%);
}

button:active {
  transform: translateY(1px);
}

button:focus-visible {
  outline: 3px solid #dfb7ff;
  outline-offset: 3px;
}

.game-shell {
  display: grid;
  min-block-size: 100svh;
  place-items: center;
  padding-block: var(--stage-inset-block-start) var(--stage-inset-block-end);
  padding-inline: var(--stage-inset-inline-start) var(--stage-inset-inline-end);
}

.game-frame,
.overlay {
  inline-size: var(--stage-inline-size);
  min-block-size: 0;
  aspect-ratio: 16 / 9;
}

.game-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid rgb(102 234 255 / 55%);
  border-radius: 1rem;
  background:
    radial-gradient(circle at 50% 20%, rgb(24 108 153 / 25%), transparent 46%),
    linear-gradient(180deg, #081e45, #06152e 58%, #040b20);
  box-shadow:
    0 1.5rem 5rem rgb(0 0 0 / 50%),
    inset 0 0 2rem rgb(50 223 255 / 8%);
  isolation: isolate;
}

.game-frame::after {
  position: absolute;
  z-index: 5;
  inset: 0;
  background: repeating-linear-gradient(
    to bottom,
    transparent 0,
    transparent 3px,
    rgb(96 225 255 / 4%) 4px
  );
  content: "";
  pointer-events: none;
  animation: scan-drift 12s linear infinite;
}

#game-canvas {
  display: block;
  inline-size: 100%;
  block-size: 100%;
  touch-action: none;
}

.hud {
  position: absolute;
  z-index: 2;
  inset-block-start: 0.5rem;
  inset-inline: 0.5rem;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.25rem;
  pointer-events: none;
}

.hud-chip {
  display: grid;
  min-inline-size: 0;
  padding: 0.25rem 0.35rem;
  border: 1px solid rgb(105 247 255 / 45%);
  border-radius: 0.55rem;
  background: rgb(4 16 43 / 78%);
  box-shadow: inset 0 0 0.75rem rgb(52 227 255 / 5%);
  backdrop-filter: blur(0.75rem);
}

.hud-chip small {
  color: #aee9f1;
  font-size: 0.75rem;
}

.hud-chip strong {
  overflow: hidden;
  font-size: 0.875rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.combo-chip {
  border-color: rgb(241 100 255 / 55%);
}

.controls {
  position: absolute;
  z-index: 3;
  inset-inline-end: 0.5rem;
  inset-block-end: 0.5rem;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 0.3rem;
  max-inline-size: calc(100% - 1rem);
  min-inline-size: 0;
  padding: 0;
  border: 0;
  margin: 0;
}

.power-readout {
  display: grid;
  min-block-size: 48px;
  min-inline-size: 4.5rem;
  place-content: center;
  padding-inline: 0.55rem;
  border: 1px solid rgb(210 134 255 / 70%);
  border-radius: 999rem;
  background: rgb(31 16 69 / 92%);
  font-size: 0.875rem;
  text-align: center;
}

.overlay {
  position: fixed;
  z-index: 4;
  inset-block: var(--stage-inset-block-start) var(--stage-inset-block-end);
  inset-inline: var(--stage-inset-inline-start) var(--stage-inset-inline-end);
  max-inline-size: none;
  block-size: auto;
  max-block-size: none;
  margin: auto;
  padding: 1rem;
  border: 0;
  align-content: safe center;
  justify-items: center;
  gap: 0.55rem;
  overflow-y: auto;
  background:
    radial-gradient(circle, rgb(40 35 105 / 58%), rgb(2 9 25 / 94%)),
    #030817;
  color: inherit;
  text-align: center;
}

.overlay[open] {
  display: grid;
}

.overlay[hidden] {
  display: none;
}

.overlay::backdrop {
  background: rgb(1 5 17 / 82%);
  backdrop-filter: blur(0.35rem);
}

.overlay h1,
.overlay h2 {
  margin: 0;
  color: #fff;
  line-height: 1.1;
  letter-spacing: 0.08em;
  text-shadow:
    0 0 0.4rem rgb(83 236 255 / 80%),
    0 0 1.2rem rgb(216 68 255 / 45%);
}

.overlay h1 {
  font-size: clamp(1.55rem, 8vw, 3.25rem);
  animation: title-glow 3s ease-in-out infinite;
}

.overlay h2 {
  font-size: clamp(1.25rem, 6vw, 2.25rem);
}

.overlay p {
  max-inline-size: 34rem;
  margin: 0;
  color: #d4f1f5;
  font-size: clamp(0.8rem, 2.8vw, 1rem);
}

.overlay .eyebrow {
  color: #86f7ff;
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.16em;
}

.primary-action {
  min-inline-size: 10rem;
  margin-block-start: 0.25rem;
  padding: 0.75rem 1.25rem;
  background: linear-gradient(135deg, #126fd9, #872de1);
  box-shadow: 0 0 1.8rem rgb(94 176 255 / 45%);
  font-size: 0.95rem;
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(5.5rem, 1fr));
  gap: 0.4rem;
  margin: 0;
}

.result-grid > div {
  padding: 0.4rem;
  border: 1px solid rgb(152 118 255 / 36%);
  border-radius: 0.65rem;
  background: rgb(93 68 180 / 25%);
}

.result-grid dt {
  color: #b9e7ee;
  font-size: 0.75rem;
}

.result-grid dd {
  margin: 0.1rem 0 0;
  font-size: 1.05rem;
  font-weight: 800;
}

.portrait-hint {
  position: absolute;
  z-index: 3;
  inset-inline-start: 50%;
  inset-block-end: 0.35rem;
  display: none;
  inline-size: max-content;
  max-inline-size: calc(100% - 1rem);
  margin: 0;
  padding: 0.2rem 0.5rem;
  border-radius: 999rem;
  transform: translateX(-50%);
  background: rgb(2 11 31 / 80%);
  color: #d4f1f5;
  font-size: 0.75rem;
  pointer-events: none;
}

.sr-only {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  padding: 0;
  border: 0;
  margin: -1px;
  clip-path: inset(50%);
  overflow: hidden;
  white-space: nowrap;
}

@keyframes scan-drift {
  to { transform: translateY(4px); }
}

@keyframes title-glow {
  50% { text-shadow: 0 0 0.6rem rgb(83 236 255 / 95%), 0 0 1.6rem rgb(216 68 255 / 65%); }
}

@media (orientation: portrait) and (max-width: 767px) {
  .portrait-hint {
    display: block;
  }

  .controls {
    inset-block-end: 2.25rem;
  }
}

@media (min-width: 768px) {
  :root {
    --stage-edge: 1rem;
    --stage-edge-as-inline: 1.7777778rem;
  }

  .hud {
    inset-block-start: 1rem;
    inset-inline: 1rem;
    gap: 0.7rem;
  }

  .hud-chip {
    padding: 0.55rem 0.75rem;
  }

  .hud-chip small {
    font-size: 0.75rem;
  }

  .hud-chip strong {
    font-size: 1.05rem;
  }

  .controls {
    inset-inline-end: 1rem;
    inset-block-end: 1rem;
    gap: 0.5rem;
  }

  .overlay {
    gap: 0.85rem;
    padding: 1.5rem;
  }

  .result-grid > div {
    padding: 0.65rem;
  }
}

@media (min-width: 1024px) {
  :root {
    --stage-edge: 1.5rem;
    --stage-edge-as-inline: 2.6666667rem;
  }

  .game-frame {
    border-radius: 1.35rem;
  }

  .overlay .eyebrow {
    font-size: 0.875rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .game-frame::after,
  .overlay h1 {
    animation: none;
  }

  button {
    transition: none;
  }

  button:active {
    transform: none;
  }
}

@media (forced-colors: active) {
  .game-frame,
  .hud-chip,
  .power-readout,
  .result-grid > div,
  button {
    border-color: CanvasText;
  }

  .overlay,
  .overlay::backdrop,
  .hud-chip,
  .power-readout,
  button {
    background: Canvas;
    color: CanvasText;
    forced-color-adjust: auto;
  }

  button:focus-visible {
    outline-color: Highlight;
  }
}