:root {
  color-scheme: light;
  --canvas: #dce4eb;
  --surface: #f7f8fa;
  --paper: #ffffff;
  --ink: #17213a;
  --ink-soft: #526178;
  --cobalt: #2056e8;
  --cobalt-dark: #173fb1;
  --coral: #ee5947;
  --coral-dark: #b72d27;
  --lime: #cbea63;
  --success: #27835a;
  --line: #b9c6d2;
  --disabled: #d7dde3;
  --focus: #ffd43b;
  --font-ui: "Noto Sans TC", "Segoe UI", system-ui, sans-serif;
  --font-data: "IBM Plex Mono", "Cascadia Mono", Consolas, monospace;
  --radius-small: 8px;
  --radius-medium: 14px;
  --z-dropdown: 20;
  --z-dialog: 40;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--canvas);
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  min-width: 320px;
  min-height: 100vh;
  min-height: 100dvh;
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font-family: var(--font-ui);
  font-size: 16px;
  line-height: 1.45;
}

button,
select {
  color: inherit;
  font: inherit;
}

button,
summary,
select {
  -webkit-tap-highlight-color: transparent;
}

button {
  touch-action: manipulation;
}

button:focus-visible,
summary:focus-visible,
select:focus-visible,
a:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
}

.skip-link {
  position: fixed;
  top: 8px;
  left: 50%;
  z-index: calc(var(--z-dialog) + 1);
  min-height: 44px;
  padding: 11px 18px;
  background: var(--ink);
  color: var(--paper);
  font-weight: 800;
  text-decoration: none;
  transform: translate(-50%, -160%);
  transition: transform 180ms cubic-bezier(0.22, 1, 0.36, 1);
}

.skip-link:focus {
  transform: translate(-50%, 0);
}

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

.app-shell {
  display: flex;
  width: min(1180px, 100%);
  min-height: 100vh;
  min-height: 100dvh;
  margin: 0 auto;
  padding: 16px 20px 10px;
  flex-direction: column;
  gap: 12px;
}

.topbar {
  position: relative;
  z-index: var(--z-dropdown);
  display: grid;
  min-height: 64px;
  padding: 10px 12px;
  grid-template-columns: minmax(132px, 1fr) auto minmax(132px, 1fr);
  align-items: center;
  background: var(--ink);
  border-radius: var(--radius-medium);
  color: var(--paper);
}

.back-link {
  display: inline-flex;
  width: fit-content;
  min-height: 44px;
  padding: 9px 13px;
  align-items: center;
  gap: 8px;
  border-radius: var(--radius-small);
  color: var(--paper);
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
  transition:
    background-color 160ms ease-out,
    color 160ms ease-out;
}

.back-link:hover {
  background: var(--lime);
  color: var(--ink);
}

.back-arrow {
  font-family: var(--font-data);
  font-size: 1.1rem;
}

.brand-lockup {
  display: flex;
  min-width: 0;
  align-items: center;
  justify-content: center;
  gap: 12px;
}

.brand-mark {
  position: relative;
  display: grid;
  width: 42px;
  height: 42px;
  flex: 0 0 auto;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows: repeat(3, 1fr);
  gap: 2px;
}

.brand-mark i {
  display: grid;
  border-radius: 3px;
  background: var(--lime);
  color: var(--ink);
  font-family: var(--font-data);
  font-size: 0.62rem;
  font-style: normal;
  font-weight: 600;
  line-height: 1;
  place-items: center;
}

.brand-mark i:nth-child(1) {
  grid-column: 2;
}

.brand-mark i:nth-child(2) {
  grid-row: 2;
  grid-column: 1;
}

.brand-mark i:nth-child(3) {
  grid-row: 2;
  grid-column: 2;
  background: var(--coral);
}

.brand-mark i:nth-child(4) {
  grid-row: 2;
  grid-column: 3;
}

.brand-mark i:nth-child(5) {
  grid-row: 3;
  grid-column: 2;
}

.brand-copy {
  display: flex;
  min-width: 0;
  flex-direction: column;
  line-height: 1.1;
}

.brand-copy span {
  color: #b9c6dd;
  font-size: 0.7rem;
  font-weight: 700;
}

.brand-copy strong {
  overflow: hidden;
  color: var(--paper);
  font-size: 1rem;
  font-weight: 900;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.top-actions {
  display: flex;
  justify-content: flex-end;
}

.settings {
  position: relative;
}

.settings > summary {
  display: inline-flex;
  min-height: 44px;
  padding: 9px 12px;
  align-items: center;
  gap: 8px;
  border-radius: var(--radius-small);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 700;
  list-style: none;
  transition:
    background-color 160ms ease-out,
    color 160ms ease-out;
}

.settings > summary::-webkit-details-marker {
  display: none;
}

.settings > summary:hover,
.settings[open] > summary {
  background: var(--paper);
  color: var(--ink);
}

.settings-symbol {
  font-family: var(--font-data);
  letter-spacing: 0.12em;
  transform: translateY(-2px);
}

.settings-panel {
  position: absolute;
  top: calc(100% + 9px);
  right: 0;
  width: 240px;
  padding: 16px;
  background: var(--paper);
  border-radius: var(--radius-small);
  color: var(--ink);
  box-shadow: 6px 6px 0 rgba(23, 33, 58, 0.28);
}

.settings-panel label {
  display: block;
  margin-bottom: 7px;
  color: var(--ink-soft);
  font-size: 0.78rem;
  font-weight: 800;
}

.settings-panel select {
  width: 100%;
  min-height: 44px;
  padding: 8px 10px;
  border: 2px solid var(--ink);
  border-radius: 6px;
  background: var(--paper);
  font-size: 1rem;
}

.settings-version {
  display: flex;
  margin: 14px 0 0;
  padding-top: 11px;
  justify-content: space-between;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-family: var(--font-data);
  font-size: 0.75rem;
}

.game-stage {
  display: flex;
  min-height: 0;
  flex: 1;
  flex-direction: column;
  overflow: hidden;
  background: var(--surface);
  border-radius: var(--radius-medium);
  box-shadow: 0 6px 0 #aebcc8;
}

.stage-heading {
  display: flex;
  padding: 20px 24px 18px;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
}

.title-block {
  min-width: 0;
}

.stage-code,
.module-index {
  margin: 0 0 5px;
  color: var(--cobalt);
  font-family: var(--font-data);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
}

.stage-heading h1 {
  margin: 0;
  font-size: 2.15rem;
  font-weight: 900;
  letter-spacing: -0.035em;
  line-height: 1.05;
  text-wrap: balance;
}

.stage-heading p:last-child {
  max-width: 58ch;
  margin: 7px 0 0;
  color: var(--ink-soft);
  font-size: 0.92rem;
  text-wrap: pretty;
}

.difficulty-switch {
  display: inline-flex;
  padding: 4px;
  flex: 0 0 auto;
  gap: 3px;
  background: #e2e8ed;
  border-radius: 10px;
}

.difficulty-button {
  min-width: 72px;
  min-height: 44px;
  padding: 9px 13px;
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: var(--ink-soft);
  cursor: pointer;
  font-size: 0.86rem;
  font-weight: 800;
  transition:
    background-color 160ms ease-out,
    color 160ms ease-out,
    transform 160ms ease-out;
}

.difficulty-button:hover {
  color: var(--cobalt-dark);
}

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

.difficulty-button.is-active {
  background: var(--cobalt);
  color: var(--paper);
}

.score-rail {
  display: grid;
  min-height: 62px;
  margin: 0;
  padding: 0 24px;
  grid-template-columns: minmax(130px, auto) minmax(92px, auto) minmax(110px, auto) 1fr;
  align-items: stretch;
  background: var(--cobalt);
  color: var(--paper);
}

.stat-block {
  display: flex;
  min-width: 0;
  padding: 10px 20px;
  align-items: center;
  gap: 10px;
  border-right: 1px solid rgba(255, 255, 255, 0.28);
}

.stat-block:first-child {
  padding-left: 0;
}

.stat-label {
  color: #dbe5ff;
  font-size: 0.72rem;
  font-weight: 700;
}

.stat-block > strong {
  font-family: var(--font-data);
  font-size: 1.15rem;
  font-weight: 600;
}

.life-meter {
  display: inline-flex;
  gap: 5px;
}

.life-meter i {
  display: block;
  width: 15px;
  height: 15px;
  background: var(--coral);
  border-radius: 4px 4px 7px 7px;
  transform: rotate(45deg);
  transition:
    background-color 180ms ease-out,
    opacity 180ms ease-out;
}

.life-meter i.is-lost {
  background: #8fa7e8;
  opacity: 0.58;
}

.game-status {
  display: flex;
  min-width: 0;
  margin: 9px 0 9px 18px;
  padding: 8px 12px;
  align-items: center;
  gap: 9px;
  align-self: center;
  background: var(--lime);
  border-radius: 8px;
  color: var(--ink);
  font-size: 0.82rem;
  font-weight: 700;
}

.status-dot {
  width: 8px;
  height: 8px;
  flex: 0 0 auto;
  background: var(--cobalt);
  border-radius: 50%;
}

.game-status[data-tone="success"] {
  background: #bfe8cf;
}

.game-status[data-tone="success"] .status-dot {
  background: var(--success);
}

.game-status[data-tone="danger"] {
  background: #ffd7d1;
}

.game-status[data-tone="danger"] .status-dot {
  background: var(--coral-dark);
}

.play-layout {
  display: grid;
  min-height: 0;
  padding: 20px 24px 22px;
  flex: 1;
  grid-template-columns: minmax(430px, 1fr) minmax(270px, 340px);
  gap: 22px;
}

.puzzle-module,
.input-module {
  min-width: 0;
}

.puzzle-module {
  display: flex;
  min-height: 0;
  flex-direction: column;
}

.module-heading,
.input-heading {
  display: flex;
  min-height: 54px;
  margin-bottom: 12px;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
}

.module-heading h2,
.input-heading h2 {
  margin: 0;
  font-size: 1rem;
  font-weight: 900;
  letter-spacing: -0.01em;
}

.module-heading > p,
.input-heading > p {
  max-width: 42ch;
  margin: 2px 0 0;
  color: var(--ink-soft);
  font-size: 0.75rem;
  text-align: right;
  text-wrap: pretty;
}

.board-wrap {
  position: relative;
  display: grid;
  min-height: 0;
  padding: 28px 42px 34px;
  flex: 1;
  overflow: hidden;
  background: var(--ink);
  border-radius: var(--radius-medium);
  place-items: center;
}

.puzzle-grid {
  --cell-size: clamp(50px, 5.2vw, 66px);
  position: relative;
  display: grid;
  width: fit-content;
  max-width: 100%;
  grid-template-columns: repeat(5, var(--cell-size));
  grid-template-rows: repeat(5, var(--cell-size));
  gap: 6px;
}

.cell {
  position: relative;
  display: grid;
  width: var(--cell-size);
  height: var(--cell-size);
  min-width: 0;
  min-height: 0;
  padding: 0;
  border: 0;
  border-radius: var(--radius-small);
  color: var(--paper);
  font-family: var(--font-data);
  font-size: clamp(1.05rem, 2.4vw, 1.55rem);
  font-weight: 600;
  line-height: 1;
  place-items: center;
}

.cell-empty {
  background: transparent;
  pointer-events: none;
}

.cell-operator {
  background: transparent;
  color: #a9bad4;
}

.cell-given {
  background: var(--paper);
  color: var(--ink);
  transition:
    background-color 160ms ease-out,
    color 160ms ease-out;
}

.cell-fillable {
  min-width: 44px;
  min-height: 44px;
  background: var(--lime);
  color: var(--ink);
  cursor: pointer;
  transition:
    background-color 160ms ease-out,
    color 160ms ease-out,
    transform 160ms cubic-bezier(0.22, 1, 0.36, 1);
}

.cell-fillable:hover {
  background: #daf87c;
  transform: translateY(-2px);
}

.cell.in-path.cell-given {
  background: #dce6ff;
  color: var(--cobalt-dark);
}

.cell.in-path.cell-operator {
  color: var(--lime);
}

.cell-fillable.is-selected {
  z-index: 1;
  background: var(--coral);
  color: var(--paper);
  outline: 4px solid var(--paper);
  outline-offset: 2px;
  transform: translateY(-2px);
}

.cell-fillable.is-filled {
  background: #7ec7f2;
}

.cell-fillable.is-hinted {
  background: #f4c95d;
  cursor: default;
}

.cell-fillable.is-correct {
  animation: correct-confirm 360ms cubic-bezier(0.22, 1, 0.36, 1);
}

.cell-fillable.is-wrong {
  background: var(--coral-dark);
  color: var(--paper);
  animation: wrong-nudge 320ms ease-out;
}

@keyframes correct-confirm {
  0% {
    background: var(--lime);
    transform: scale(1);
  }
  55% {
    background: var(--success);
    color: var(--paper);
    transform: scale(1.08);
  }
  100% {
    background: #7ec7f2;
    transform: scale(1);
  }
}

@keyframes wrong-nudge {
  0%,
  100% {
    transform: translateX(0);
  }
  35% {
    transform: translateX(-5px);
  }
  70% {
    transform: translateX(5px);
  }
}

.axis-label {
  position: absolute;
  color: #7988a1;
  font-family: var(--font-data);
  font-size: 0.58rem;
  font-weight: 600;
  letter-spacing: 0.15em;
}

.axis-label-x {
  right: 15px;
  bottom: 11px;
}

.axis-label-y {
  top: 16px;
  left: 14px;
  writing-mode: vertical-rl;
}

.input-module {
  display: flex;
  padding: 18px;
  flex-direction: column;
  background: #e8edf1;
  border-radius: var(--radius-medium);
}

.input-heading {
  display: block;
  margin-bottom: 16px;
}

.input-heading > p {
  max-width: 34ch;
  margin-top: 6px;
  text-align: left;
}

.number-tray {
  display: grid;
  margin-bottom: 18px;
  grid-template-columns: repeat(auto-fit, minmax(54px, 1fr));
  gap: 8px;
}

.number-button {
  min-width: 44px;
  min-height: 52px;
  padding: 8px;
  border: 2px solid var(--ink);
  border-radius: var(--radius-small);
  background: var(--paper);
  color: var(--ink);
  cursor: pointer;
  font-family: var(--font-data);
  font-size: 1.05rem;
  font-weight: 600;
  transition:
    background-color 150ms ease-out,
    color 150ms ease-out,
    transform 150ms ease-out;
}

.number-button:hover {
  background: var(--cobalt);
  color: var(--paper);
  transform: translateY(-2px);
}

.number-button:active {
  transform: translateY(0);
}

.number-button.is-used {
  border-color: #9ba8b4;
  background: var(--disabled);
  color: #647181;
  text-decoration: line-through;
  text-decoration-thickness: 2px;
}

.utility-controls {
  display: grid;
  margin-top: auto;
  padding-top: 16px;
  grid-template-columns: repeat(3, 1fr);
  gap: 7px;
  border-top: 1px solid var(--line);
}

.utility-button {
  display: inline-flex;
  min-width: 0;
  min-height: 48px;
  padding: 8px 9px;
  border: 0;
  border-radius: var(--radius-small);
  align-items: center;
  justify-content: center;
  gap: 6px;
  background: var(--paper);
  color: var(--ink);
  cursor: pointer;
  font-size: 0.78rem;
  font-weight: 800;
  transition:
    background-color 150ms ease-out,
    color 150ms ease-out;
}

.utility-button > span:first-child {
  font-family: var(--font-data);
  font-size: 1rem;
}

.utility-button:hover:not(:disabled) {
  background: var(--ink);
  color: var(--paper);
}

.utility-button:disabled {
  color: #8895a2;
  cursor: not-allowed;
  opacity: 0.62;
}

.hint-button strong {
  display: grid;
  min-width: 20px;
  height: 20px;
  padding: 0 4px;
  background: var(--lime);
  border-radius: 5px;
  color: var(--ink);
  font-family: var(--font-data);
  font-size: 0.68rem;
  place-items: center;
}

.new-game-button {
  display: flex;
  width: 100%;
  min-height: 50px;
  margin-top: 9px;
  padding: 11px 14px;
  border: 0;
  border-radius: var(--radius-small);
  align-items: center;
  justify-content: space-between;
  background: var(--ink);
  color: var(--paper);
  cursor: pointer;
  font-weight: 900;
  transition:
    background-color 150ms ease-out,
    transform 150ms ease-out;
}

.new-game-button:hover {
  background: var(--cobalt);
}

.new-game-button:active {
  transform: translateY(1px);
}

.app-footer {
  display: flex;
  min-height: 20px;
  padding: 0 4px;
  align-items: center;
  justify-content: space-between;
  color: #566879;
  font-family: var(--font-data);
  font-size: 0.62rem;
  letter-spacing: 0.08em;
}

.result-dialog {
  width: min(420px, calc(100vw - 28px));
  padding: 28px;
  border: 0;
  border-radius: var(--radius-medium);
  background: var(--paper);
  color: var(--ink);
  box-shadow: 8px 8px 0 rgba(23, 33, 58, 0.45);
}

.result-dialog::backdrop {
  background: rgba(23, 33, 58, 0.74);
}

.dialog-marker {
  display: grid;
  width: 54px;
  height: 54px;
  margin-bottom: 18px;
  background: var(--coral);
  border-radius: 10px;
  color: var(--paper);
  font-family: var(--font-data);
  font-size: 1.6rem;
  font-weight: 600;
  place-items: center;
}

.complete-dialog .dialog-marker {
  background: var(--cobalt);
}

.result-dialog h2 {
  margin: 0;
  font-size: 1.65rem;
  font-weight: 900;
  letter-spacing: -0.025em;
  text-wrap: balance;
}

.result-dialog > p {
  max-width: 36ch;
  margin: 8px 0 20px;
  color: var(--ink-soft);
  text-wrap: pretty;
}

.dialog-score {
  display: flex;
  min-height: 64px;
  margin-bottom: 18px;
  padding: 12px 14px;
  align-items: center;
  justify-content: space-between;
  background: #e8edf1;
  border-radius: var(--radius-small);
}

.dialog-score span {
  color: var(--ink-soft);
  font-size: 0.8rem;
  font-weight: 700;
}

.dialog-score strong {
  font-family: var(--font-data);
  font-size: 1.45rem;
}

.dialog-actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.dialog-primary,
.dialog-secondary {
  min-height: 48px;
  padding: 10px 14px;
  border-radius: var(--radius-small);
  cursor: pointer;
  font-weight: 900;
}

.dialog-primary {
  border: 0;
  background: var(--cobalt);
  color: var(--paper);
}

.dialog-secondary {
  border: 2px solid var(--ink);
  background: var(--paper);
  color: var(--ink);
}

.dialog-primary:hover {
  background: var(--cobalt-dark);
}

.dialog-secondary:hover {
  background: var(--ink);
  color: var(--paper);
}

@media (max-width: 800px) {
  .app-shell {
    padding-right: 12px;
    padding-left: 12px;
  }

  .play-layout {
    grid-template-columns: 1fr;
  }

  .board-wrap {
    min-height: 380px;
  }

  .score-rail {
    grid-template-columns: repeat(3, 1fr);
  }

  .game-status {
    min-height: 44px;
    margin: 0;
    grid-column: 1 / -1;
    border-radius: 0;
  }

  .stat-block {
    justify-content: center;
  }

  .stat-block:first-child {
    padding-left: 10px;
  }
}

@media (max-width: 560px) {
  .app-shell {
    padding: 8px 8px 6px;
    gap: 8px;
  }

  .topbar {
    min-height: 56px;
    padding: 6px 7px;
    grid-template-columns: 92px 1fr 92px;
  }

  .back-link,
  .settings > summary {
    padding-right: 9px;
    padding-left: 9px;
  }

  .back-link {
    font-size: 0.8rem;
  }

  .settings-label {
    display: none;
  }

  .brand-mark {
    width: 36px;
    height: 36px;
  }

  .brand-copy span {
    display: none;
  }

  .brand-copy strong {
    max-width: 9em;
    font-size: 0.9rem;
  }

  .stage-heading {
    padding: 15px 14px 13px;
    align-items: flex-start;
    flex-direction: column;
    gap: 13px;
  }

  .stage-heading h1 {
    font-size: 1.7rem;
  }

  .difficulty-switch {
    display: grid;
    width: 100%;
    grid-template-columns: repeat(3, 1fr);
  }

  .difficulty-button {
    min-width: 0;
  }

  .score-rail {
    padding: 0;
  }

  .stat-block {
    padding: 8px 6px;
    flex-direction: column;
    gap: 2px;
  }

  .lives-block {
    justify-content: center;
  }

  .life-meter i {
    width: 12px;
    height: 12px;
  }

  .play-layout {
    padding: 16px 12px 18px;
    gap: 18px;
  }

  .module-heading {
    display: block;
  }

  .module-heading > p {
    margin-top: 5px;
    text-align: left;
  }

  .board-wrap {
    min-height: 320px;
    padding: 24px 26px 30px;
  }

  .puzzle-grid {
    --cell-size: min(14vw, 56px);
    gap: 5px;
  }

  .cell {
    font-size: 1.12rem;
  }

  .input-module {
    padding: 14px;
  }

  .number-tray {
    grid-template-columns: repeat(auto-fit, minmax(48px, 1fr));
  }

  .utility-button {
    flex-direction: column;
    gap: 1px;
  }

  .result-dialog {
    padding: 22px;
  }
}

@media (orientation: landscape) and (max-height: 560px) {
  .app-shell {
    min-height: 100dvh;
    padding: 6px 8px 5px;
    gap: 6px;
  }

  .topbar {
    min-height: 46px;
    padding-top: 1px;
    padding-bottom: 1px;
  }

  .back-link,
  .settings > summary {
    min-height: 44px;
  }

  .brand-mark {
    width: 34px;
    height: 34px;
  }

  .brand-copy span {
    display: none;
  }

  .game-stage {
    box-shadow: 0 4px 0 #aebcc8;
  }

  .stage-heading {
    min-height: 46px;
    padding: 6px 12px;
    align-items: center;
    flex-direction: row;
  }

  .stage-code,
  .stage-heading p:last-child {
    display: none;
  }

  .stage-heading h1 {
    font-size: 1.25rem;
  }

  .difficulty-switch {
    width: auto;
  }

  .difficulty-button {
    min-width: 62px;
    min-height: 44px;
    padding: 6px 9px;
  }

  .score-rail {
    min-height: 42px;
    padding: 0 12px;
    grid-template-columns: 120px 80px 92px 1fr;
  }

  .stat-block {
    padding: 5px 12px;
    flex-direction: row;
  }

  .game-status {
    min-height: 30px;
    margin: 5px 0 5px 10px;
    padding: 4px 8px;
  }

  .play-layout {
    padding: 8px 12px 10px;
    grid-template-columns: minmax(300px, 1fr) minmax(278px, 0.9fr);
    gap: 12px;
  }

  .module-heading,
  .input-heading {
    min-height: 30px;
    margin-bottom: 5px;
  }

  .module-heading > p,
  .input-heading > p,
  .module-index {
    display: none;
  }

  .board-wrap {
    min-height: 0;
    padding: 10px 22px 14px;
  }

  .puzzle-grid {
    --cell-size: 44px;
    gap: 4px;
  }

  .input-module {
    padding: 8px 10px;
  }

  .number-tray {
    margin-bottom: 7px;
    grid-template-columns: repeat(auto-fit, minmax(44px, 1fr));
    gap: 5px;
  }

  .number-button {
    min-height: 44px;
    padding: 4px;
  }

  .utility-controls {
    padding-top: 7px;
    gap: 5px;
  }

  .utility-button,
  .new-game-button {
    min-height: 44px;
  }

  .new-game-button {
    margin-top: 5px;
    padding-top: 6px;
    padding-bottom: 6px;
  }

  .app-footer {
    display: none;
  }
}

@media (orientation: landscape) and (max-width: 699px) {
  .topbar {
    grid-template-columns: 78px 1fr 62px;
  }

  .back-link span:not(.back-arrow),
  .brand-copy,
  .settings-label {
    display: none;
  }

  .play-layout {
    grid-template-columns: minmax(230px, 0.88fr) minmax(250px, 1.12fr);
  }

  .puzzle-grid {
    --cell-size: 44px;
  }

  .axis-label {
    display: none;
  }
}

@media (orientation: landscape) and (max-height: 360px) {
  .stage-heading {
    display: none;
  }

  .score-rail {
    min-height: 38px;
  }

  .puzzle-grid {
    --cell-size: 44px;
    gap: 3px;
  }

  .module-heading {
    display: none;
  }

  .input-heading {
    min-height: 24px;
  }

  .input-heading h2 {
    font-size: 0.82rem;
  }

  .number-button {
    min-height: 44px;
  }
}

body .fa-help-btn {
  top: 26px;
  right: max(82px, calc((100vw - 1180px) / 2 + 82px));
  bottom: auto;
  width: 44px;
  height: 44px;
  border: 2px solid var(--ink);
  border-radius: var(--radius-small);
  background: var(--paper);
  color: var(--ink);
  opacity: 1;
}

body .fa-help-btn:hover {
  background: var(--lime);
}

@media (max-width: 560px) {
  body .fa-help-btn {
    top: 14px;
    right: 61px;
  }
}

@media (orientation: landscape) and (max-height: 560px) {
  body .fa-help-btn {
    top: 7px;
    right: 62px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

@media (forced-colors: active) {
  .topbar,
  .score-rail,
  .board-wrap,
  .new-game-button,
  .dialog-primary {
    border: 1px solid CanvasText;
  }

  .cell-fillable,
  .cell-given,
  .number-button,
  .utility-button,
  .difficulty-button {
    border: 1px solid ButtonText;
  }

  .cell-fillable.is-selected {
    outline: 4px solid Highlight;
  }

  .status-dot,
  .life-meter i {
    forced-color-adjust: none;
  }
}