.stack-page {
  min-height: 100vh;
  min-height: 100svh;
  padding: max(0.85rem, env(safe-area-inset-top)) max(0.75rem, env(safe-area-inset-right)) max(1.5rem, env(safe-area-inset-bottom)) max(0.75rem, env(safe-area-inset-left));
}

.stack-back {
  display: inline-block;
  padding: 0.55rem 0;
  color: var(--quiet);
  font-size: 0.7rem;
  text-decoration: none;
  transition: color 140ms ease, transform 140ms ease;
}

.stack-back:hover,
.stack-back:focus-visible {
  color: var(--green);
  transform: translateX(-0.18rem);
}

.stack-shell {
  width: min(59rem, 100%);
  margin: 0 auto;
  padding: clamp(1.6rem, 5vw, 3.5rem) 0 1rem;
}

.stack-header {
  margin: 0 auto 1.35rem;
}

.stack-kicker,
.stack-premise,
.stack-telemetry p,
.side-label {
  margin: 0;
  color: var(--quiet);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.stack-kicker {
  margin-bottom: 0.45rem;
}

.stack-kicker span,
.stack-header h1 span,
.stack-telemetry strong,
.records dd:last-child {
  color: var(--green);
}

.stack-header h1 {
  margin: 0;
  font-size: clamp(2.35rem, 13vw, 5.6rem);
  font-weight: 600;
  line-height: 0.92;
  letter-spacing: -0.095em;
}

.stack-premise {
  margin-top: 1rem;
  max-width: 34ch;
  line-height: 1.7;
  letter-spacing: 0.04em;
  text-transform: none;
}

.stack-layout {
  display: grid;
  gap: 1.6rem;
  align-items: start;
}

.board-column {
  width: min(100%, 22rem);
  margin: 0 auto;
}

.stack-telemetry {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.45rem;
  margin-bottom: 0.55rem;
}

.stack-telemetry p {
  display: grid;
  gap: 0.2rem;
}

.stack-telemetry strong {
  overflow: hidden;
  color: var(--ink);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: -0.04em;
  text-overflow: ellipsis;
}

.board-frame {
  position: relative;
  border: 1px solid #202a23;
  background: #020302;
  box-shadow: 0 1.15rem 4rem rgba(0, 0, 0, 0.34);
}

#game-canvas {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 7;
  background: #020302;
  touch-action: none;
  -webkit-tap-highlight-color: transparent;
}

.stack-state {
  position: absolute;
  top: 0.55rem;
  right: 0.65rem;
  margin: 0;
  padding: 0.24rem 0.38rem;
  border: 1px solid rgba(101, 245, 139, 0.26);
  color: var(--green);
  background: rgba(2, 7, 4, 0.88);
  font-size: 0.55rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  pointer-events: none;
}

.stack-controls {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.45rem;
  margin-top: 0.65rem;
}

.stack-page button {
  min-width: 0;
  min-height: 3.25rem;
  padding: 0.5rem 0.35rem;
  border: 1px solid #2b352e;
  border-radius: 0;
  color: var(--ink);
  background: #080b09;
  font: 600 1.15rem/1 var(--font-mono);
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: color 110ms ease, border-color 110ms ease, background 110ms ease, transform 80ms ease;
}

.stack-page button small {
  display: block;
  margin-top: 0.25rem;
  color: var(--quiet);
  font: 500 0.52rem/1 var(--font-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.stack-page button:hover,
.stack-page button:focus-visible {
  color: var(--green);
  border-color: rgba(101, 245, 139, 0.6);
}

.stack-page button:active {
  color: var(--black);
  background: var(--green);
  transform: translateY(1px);
}

.stack-page button:active small {
  color: var(--black);
}

.stack-page button:disabled {
  opacity: 0.35;
  cursor: default;
}

.stack-run-controls {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 0.45rem;
  margin-top: 0.45rem;
}

.stack-run-controls button {
  min-height: 3rem;
  color: var(--quiet);
  font-size: 0.62rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.stack-run-controls .stack-primary {
  color: var(--green);
  border-color: rgba(101, 245, 139, 0.55);
  background: rgba(101, 245, 139, 0.055);
}

.stack-side {
  width: min(100%, 22rem);
  margin: 0 auto;
}

.next-panel {
  display: grid;
  grid-template-columns: 1fr 1.25fr;
  gap: 1rem;
  align-items: start;
  padding: 1rem;
  border: 1px solid #202a23;
  background: rgba(5, 8, 6, 0.72);
}

#next-canvas {
  display: block;
  width: min(8rem, 100%);
  height: auto;
  margin-top: 0.5rem;
  aspect-ratio: 1;
  background: #020302;
}

.records {
  margin: 0;
}

.records div {
  display: flex;
  gap: 0.75rem;
  align-items: baseline;
  justify-content: space-between;
  padding: 0.62rem 0;
  border-bottom: 1px solid #1a211c;
}

.records div:first-child {
  padding-top: 0;
}

.records div:last-child {
  border-bottom: 0;
}

.records dt {
  color: var(--quiet);
  font-size: 0.57rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.records dd {
  margin: 0;
  color: var(--ink);
  font-size: 0.75rem;
}

.stack-rules {
  margin-top: 1rem;
  padding: 0.9rem 0;
  color: var(--quiet);
  font-size: 0.68rem;
  line-height: 1.65;
}

.stack-rules h2 {
  margin: 0 0 0.7rem;
  color: var(--ink);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.stack-rules ol {
  margin: 0;
  padding-left: 1.5rem;
}

.stack-rules li + li {
  margin-top: 0.3rem;
}

.gesture-note,
.key-note {
  margin: 1rem 0 0;
}

.key-note {
  display: none;
}

.stack-rules kbd {
  display: inline-block;
  min-width: 1.35rem;
  margin: 0 0.1rem;
  padding: 0.08rem 0.22rem;
  border: 1px solid #29322c;
  color: var(--ink);
  font: inherit;
  text-align: center;
}

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

@media (min-width: 48rem) {
  .stack-shell {
    padding-top: 2.8rem;
  }

  .stack-header {
    display: flex;
    align-items: end;
    justify-content: space-between;
    margin-bottom: 2rem;
  }

  .stack-premise {
    margin: 0 0 0.25rem;
    text-align: right;
  }

  .stack-layout {
    grid-template-columns: minmax(20rem, 22rem) minmax(16rem, 1fr);
    gap: clamp(2rem, 6vw, 5rem);
  }

  .board-column,
  .stack-side {
    width: 100%;
    margin: 0;
  }

  .stack-side {
    position: sticky;
    top: 1.5rem;
    padding-top: 1.25rem;
  }

  .key-note {
    display: block;
  }
}

@media (max-width: 47.99rem) {
  .stack-page {
    padding-bottom: calc(7.2rem + env(safe-area-inset-bottom));
  }

  .control-dock {
    position: fixed;
    z-index: 10;
    right: 0;
    bottom: 0;
    left: 0;
    padding: 0.45rem max(0.75rem, env(safe-area-inset-right)) max(0.45rem, env(safe-area-inset-bottom)) max(0.75rem, env(safe-area-inset-left));
    border-top: 1px solid #202a23;
    background: rgba(3, 6, 4, 0.96);
    box-shadow: 0 -0.8rem 2rem rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(8px);
  }

  .stack-controls,
  .stack-run-controls {
    width: min(100%, 22rem);
    margin-right: auto;
    margin-left: auto;
  }

  .stack-controls {
    margin-top: 0;
  }

  .stack-page.is-game-active .stack-shell {
    padding-top: 0.2rem;
  }

  .stack-page.is-game-active .stack-header {
    margin-bottom: 0.5rem;
  }

  .stack-page.is-game-active .stack-kicker,
  .stack-page.is-game-active .stack-premise {
    display: none;
  }

  .stack-page.is-game-active .stack-header h1 {
    font-size: 1.7rem;
    letter-spacing: -0.07em;
  }

  .stack-page.is-game-active .board-column {
    width: min(100%, calc((100svh - 15rem) * 4 / 7));
  }

  .stack-page.is-game-active .stack-telemetry {
    margin-bottom: 0.35rem;
  }
}

@media (max-width: 47.99rem) and (max-height: 30rem) and (orientation: landscape) {
  .stack-page {
    overflow: hidden;
    padding: 0.35rem calc(16.5rem + env(safe-area-inset-right)) 0.35rem max(0.5rem, env(safe-area-inset-left));
  }

  .stack-back,
  .stack-header,
  .stack-side {
    display: none;
  }

  .stack-shell {
    width: 100%;
    padding: 0;
  }

  .stack-layout {
    display: block;
  }

  .stack-page.is-game-active .board-column {
    width: min(100%, calc((100svh - 2.8rem) * 4 / 7));
  }

  .control-dock {
    top: 0;
    right: 0;
    bottom: 0;
    left: auto;
    display: grid;
    width: calc(16rem + env(safe-area-inset-right));
    align-content: center;
    border-top: 0;
    border-left: 1px solid #202a23;
  }
}

@media (max-width: 22rem) {
  .stack-telemetry {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .stack-page *,
  .stack-page *::before,
  .stack-page *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.001ms !important;
  }
}