:root {
  color-scheme: dark;
  --night: #070b25;
  --night-soft: #10163a;
  --indigo: #252d6c;
  --indigo-light: #5963b3;
  --ink: #10173a;
  --mint: #58e1c5;
  --mint-light: #8ef6d0;
  --coral: #f46f91;
  --gold: #ffd659;
  --pearl: #f7faff;
  --cream: #fff7e8;
  --glass: rgb(14 21 61 / 84%);
  --glass-strong: rgb(11 17 50 / 94%);
  --outline: 0 0 0 3px var(--night), 0 0 0 7px var(--mint-light);
  --rounded: "Arial Rounded MT Bold", "Trebuchet MS", ui-rounded, system-ui, sans-serif;
  --body: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

html,
body {
  width: 100%;
  min-width: 320px;
  height: 100%;
  margin: 0;
}

html {
  background: var(--night);
  -webkit-text-size-adjust: 100%;
}

body {
  overflow: hidden;
  color: var(--pearl);
  background:
    radial-gradient(circle at 50% 110%, rgb(57 213 206 / 25%), transparent 40%),
    radial-gradient(circle at 8% 18%, rgb(244 111 145 / 14%), transparent 26%),
    var(--night);
  font-family: var(--body);
  line-height: 1.5;
}

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

button {
  border: 0;
  color: inherit;
  font: inherit;
  cursor: pointer;
  touch-action: manipulation;
}

button:disabled {
  cursor: not-allowed;
}

button:focus-visible,
canvas:focus-visible,
a:focus-visible {
  outline: none;
  box-shadow: var(--outline);
}

img {
  display: block;
  max-width: 100%;
}

kbd {
  display: inline-grid;
  min-width: 1.65em;
  min-height: 1.65em;
  place-items: center;
  padding: 0 0.35em;
  border: 1px solid rgb(142 246 208 / 60%);
  border-bottom-width: 3px;
  border-radius: 0.4em;
  color: var(--cream);
  background: rgb(7 11 37 / 68%);
  font: 700 0.9em/1 var(--rounded);
}

[hidden] {
  display: none !important;
}

.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;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: max(0.75rem, env(safe-area-inset-top));
  left: max(0.75rem, env(safe-area-inset-left));
  padding: 0.7rem 1rem;
  border-radius: 999px;
  color: var(--night);
  background: var(--mint-light);
  font-weight: 800;
  text-decoration: none;
  transform: translateY(-200%);
  transition: transform 160ms ease;
}

.skip-link:focus {
  transform: translateY(0);
}

.game-app {
  display: grid;
  width: 100%;
  min-height: 100%;
  place-items: center;
  padding: 0;
}

.game-frame {
  position: relative;
  isolation: isolate;
  width: min(100vw, calc(100svh * 16 / 9), 1280px);
  max-height: 100svh;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border: clamp(2px, 0.45vw, 6px) solid var(--ink);
  border-radius: clamp(0px, 1.8vw, 24px);
  background: var(--night-soft);
  box-shadow:
    0 26px 90px rgb(0 0 0 / 55%),
    0 0 0 1px rgb(142 246 208 / 20%),
    inset 0 0 0 2px rgb(255 255 255 / 6%);
}

.game-frame::after {
  position: absolute;
  z-index: 20;
  inset: 0;
  border: 1px solid rgb(255 255 255 / 12%);
  border-radius: inherit;
  content: "";
  pointer-events: none;
}

.screen {
  position: absolute;
  z-index: 1;
  inset: 0;
  display: none;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
}

.screen.is-active {
  display: grid;
}

.menu-screen,
.selection-screen {
  background:
    linear-gradient(180deg, rgb(5 9 31 / 8%) 0%, rgb(5 9 31 / 12%) 50%, rgb(5 9 31 / 56%) 100%),
    url("assets/menu/main-background.png") center / cover no-repeat;
}

.menu-screen {
  grid-template-rows: auto 1fr auto;
  place-items: center;
  padding: clamp(0.85rem, 2.7vw, 2.1rem) clamp(1rem, 4vw, 3rem) clamp(0.8rem, 2vw, 1.4rem);
}

.menu-screen::before,
.selection-screen::before {
  position: absolute;
  z-index: -1;
  inset: 0;
  background:
    radial-gradient(circle at center, transparent 12%, rgb(7 11 37 / 9%) 58%, rgb(7 11 37 / 44%) 100%),
    linear-gradient(90deg, rgb(7 11 37 / 20%), transparent 30% 70%, rgb(7 11 37 / 20%));
  content: "";
  pointer-events: none;
}

.brand-lockup {
  display: flex;
  width: min(48vw, 570px);
  align-items: center;
  justify-content: center;
  filter: drop-shadow(0 10px 18px rgb(5 9 31 / 38%));
  animation: float-in 620ms cubic-bezier(0.2, 0.8, 0.2, 1) both;
}

.brand-mark {
  width: clamp(62px, 8vw, 104px);
  margin-right: clamp(-1rem, -1.5vw, -0.5rem);
  transform: rotate(-5deg);
}

.brand-title {
  width: min(41vw, 480px);
}

.menu-content {
  display: grid;
  align-self: center;
  justify-items: center;
  gap: clamp(0.25rem, 0.8vw, 0.7rem);
  transform: translateY(clamp(-0.3rem, -1vh, -0.05rem));
}

.eyebrow {
  margin: 0;
  color: var(--mint-light);
  font: 900 clamp(0.62rem, 1vw, 0.78rem)/1.2 var(--rounded);
  letter-spacing: 0.2em;
  text-align: center;
  text-shadow: 0 2px 10px rgb(7 11 37 / 80%);
}

.menu-content > .eyebrow {
  padding: 0.45rem 0.9rem;
  border: 1px solid rgb(142 246 208 / 28%);
  border-radius: 999px;
  background: rgb(7 11 37 / 52%);
  backdrop-filter: blur(8px);
}

.menu-actions {
  display: grid;
  justify-items: center;
  gap: clamp(0.1rem, 0.45vw, 0.35rem);
}

.asset-button {
  position: relative;
  width: clamp(220px, 28vw, 340px);
  padding: 0;
  border-radius: 26%;
  aspect-ratio: 4 / 1;
  background: transparent;
  filter: drop-shadow(0 7px 7px rgb(5 9 31 / 22%));
  transition: filter 140ms ease, transform 140ms ease;
}

.button-art {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  transition: opacity 100ms linear;
}

.button-art-hover,
.button-art-pressed {
  opacity: 0;
}

.asset-button:is(:hover, :focus-visible) .button-art-normal {
  opacity: 0;
}

.asset-button:is(:hover, :focus-visible) .button-art-hover {
  opacity: 1;
}

.asset-button:active {
  filter: drop-shadow(0 3px 3px rgb(5 9 31 / 20%));
  transform: translateY(2px) scale(0.99);
}

.asset-button:active .button-art-normal,
.asset-button:active .button-art-hover {
  opacity: 0;
}

.asset-button:active .button-art-pressed {
  opacity: 1;
}

.asset-button:focus-visible {
  border-radius: 2rem;
}

.menu-footer {
  display: flex;
  width: min(100%, 920px);
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.45rem 0.8rem;
  border: 1px solid rgb(142 246 208 / 16%);
  border-radius: 999px;
  color: rgb(247 250 255 / 82%);
  background: rgb(7 11 37 / 56%);
  box-shadow: 0 8px 30px rgb(5 9 31 / 22%);
  font-size: clamp(0.66rem, 1.05vw, 0.8rem);
  backdrop-filter: blur(10px);
}

.menu-footer p {
  margin: 0;
}

.autosave-note {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  white-space: nowrap;
}

.status-dot {
  width: 0.55rem;
  height: 0.55rem;
  border: 2px solid rgb(142 246 208 / 40%);
  border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 9px var(--mint);
}

.selection-screen {
  place-items: center;
  padding: clamp(0.75rem, 2.5vw, 2rem);
}

.panel-shell {
  position: relative;
  display: grid;
  width: min(88%, 1060px);
  max-height: 91%;
  padding: clamp(1.2rem, 3.2vw, 2.5rem);
  overflow: auto;
  border: clamp(3px, 0.55vw, 7px) solid var(--ink);
  border-radius: clamp(1.25rem, 3vw, 2.5rem);
  background:
    linear-gradient(145deg, rgb(58 68 143 / 70%), transparent 34%),
    var(--glass-strong);
  box-shadow:
    0 22px 60px rgb(5 9 31 / 56%),
    inset 0 0 0 3px rgb(89 99 179 / 68%),
    inset 0 1px 0 5px rgb(255 255 255 / 5%);
  backdrop-filter: blur(14px);
}

.panel-shell::after {
  position: absolute;
  top: 1rem;
  right: 1.2rem;
  width: clamp(2rem, 4vw, 3.6rem);
  aspect-ratio: 1;
  background:
    radial-gradient(circle, var(--gold) 0 9%, transparent 10%),
    conic-gradient(from 45deg, transparent 0 22%, var(--coral) 23% 27%, transparent 28% 47%, var(--mint) 48% 52%, transparent 53% 72%, var(--gold) 73% 77%, transparent 78%);
  content: "";
  filter: drop-shadow(0 0 8px rgb(255 214 89 / 45%));
  opacity: 0.8;
  pointer-events: none;
}

.panel-heading {
  text-align: center;
}

.panel-heading h2,
.overlay-card h2 {
  margin: 0.35rem 0 0;
  color: var(--cream);
  font: 900 clamp(1.55rem, 3.4vw, 2.5rem)/1.08 var(--rounded);
  letter-spacing: 0.04em;
  text-shadow: 0 4px 0 var(--ink), 0 8px 20px rgb(5 9 31 / 45%);
}

.panel-heading > p:last-child {
  margin: 0.55rem 0 0;
  color: rgb(247 250 255 / 70%);
  font-size: clamp(0.76rem, 1.25vw, 0.92rem);
}

.level-panel {
  grid-template-rows: auto 1fr auto auto;
  gap: clamp(0.65rem, 1.6vw, 1.15rem);
}

.level-grid {
  display: grid;
  min-height: 0;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: clamp(0.35rem, 1vw, 0.8rem);
  align-content: center;
}

.level-grid:empty::before {
  grid-column: 1 / -1;
  color: rgb(247 250 255 / 55%);
  content: "正在展開星圖…";
  font: 700 0.88rem var(--rounded);
  letter-spacing: 0.08em;
  text-align: center;
}

.level-grid button {
  position: relative;
  display: grid;
  min-width: 0;
  min-height: clamp(42px, 5.8vw, 62px);
  place-items: center;
  padding: 0.35rem;
  border: clamp(2px, 0.3vw, 4px) solid var(--ink);
  border-radius: clamp(0.8rem, 1.7vw, 1.25rem);
  color: var(--cream);
  background: linear-gradient(180deg, #343d85, #242a69);
  box-shadow:
    inset 0 2px 0 rgb(255 255 255 / 13%),
    0 5px 0 rgb(7 11 37 / 65%);
  font: 900 clamp(0.82rem, 1.8vw, 1.2rem)/1 var(--rounded);
  transition: color 140ms ease, filter 140ms ease, transform 140ms ease;
}

.level-grid button::after {
  position: absolute;
  top: 0.32rem;
  right: 0.42rem;
  width: 0.38rem;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--mint-light);
  box-shadow: 0 0 8px var(--mint);
  content: "";
  opacity: 0.72;
}

.level-grid button:hover:not(:disabled),
.level-grid button:focus-visible {
  color: var(--night);
  background: linear-gradient(180deg, #fff3b7, var(--gold));
  filter: brightness(1.05);
  transform: translateY(-2px);
}

.level-grid button:active:not(:disabled) {
  box-shadow: inset 0 3px 0 rgb(7 11 37 / 24%);
  transform: translateY(3px);
}

.level-grid button:disabled,
.level-grid button[aria-disabled="true"],
.level-grid button.is-locked {
  color: rgb(247 250 255 / 43%);
  background: linear-gradient(180deg, #262d61, #1a204d);
  filter: saturate(0.45);
  opacity: 0.72;
}

.level-grid button:disabled::after,
.level-grid button[aria-disabled="true"]::after,
.level-grid button.is-locked::after {
  background: rgb(247 250 255 / 28%);
  box-shadow: none;
}

.level-grid button.is-complete,
.level-grid button[data-complete="true"] {
  color: var(--night);
  background: linear-gradient(180deg, var(--mint-light), var(--mint));
}

.panel-navigation {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.8rem;
}

.icon-button {
  display: grid;
  width: clamp(44px, 5vw, 58px);
  aspect-ratio: 1;
  place-items: center;
  border: 3px solid var(--ink);
  border-radius: 50%;
  color: var(--cream);
  background: linear-gradient(180deg, #343d85, #242a69);
  box-shadow: 0 4px 0 rgb(7 11 37 / 75%);
  font: 900 1.25rem var(--rounded);
}

.icon-button:hover:not(:disabled) {
  color: var(--night);
  background: var(--mint-light);
}

.icon-button:disabled {
  opacity: 0.38;
}

.page-label {
  min-width: 5.2rem;
  padding: 0.42rem 0.8rem;
  border: 1px solid rgb(142 246 208 / 24%);
  border-radius: 999px;
  background: rgb(7 11 37 / 46%);
  font: 900 0.9rem var(--rounded);
  text-align: center;
}

.text-button {
  min-height: 44px;
  padding: 0.68rem 1.2rem;
  border: 3px solid var(--ink);
  border-radius: 999px;
  color: var(--night);
  background: linear-gradient(180deg, #fff3b7, var(--gold));
  box-shadow: 0 5px 0 rgb(7 11 37 / 70%);
  font: 900 clamp(0.78rem, 1.35vw, 0.95rem)/1.2 var(--rounded);
  letter-spacing: 0.03em;
  transition: filter 140ms ease, transform 140ms ease;
}

.text-button:hover {
  filter: brightness(1.08);
  transform: translateY(-1px);
}

.text-button:active {
  box-shadow: 0 2px 0 rgb(7 11 37 / 70%);
  transform: translateY(3px);
}

.text-button-secondary {
  color: var(--cream);
  background: linear-gradient(180deg, #343d85, #242a69);
}

.level-panel > .text-button,
.settings-panel > .text-button {
  justify-self: center;
}

.settings-panel {
  width: min(82%, 820px);
  gap: clamp(1rem, 2vw, 1.45rem);
}

.settings-list {
  display: grid;
  gap: 0.65rem;
}

.setting-row {
  display: flex;
  min-height: clamp(68px, 8.5vw, 88px);
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: clamp(0.7rem, 1.5vw, 1rem) clamp(0.85rem, 2vw, 1.25rem);
  border: 1px solid rgb(142 246 208 / 18%);
  border-radius: 1rem;
  background: rgb(7 11 37 / 46%);
  box-shadow: inset 0 1px 0 rgb(255 255 255 / 6%);
}

.setting-row h3 {
  margin: 0;
  color: var(--cream);
  font: 900 clamp(0.88rem, 1.65vw, 1.08rem)/1.2 var(--rounded);
}

.setting-row p {
  margin: 0.2rem 0 0;
  color: rgb(247 250 255 / 62%);
  font-size: clamp(0.7rem, 1.2vw, 0.86rem);
}

.toggle-button {
  display: flex;
  min-width: 7rem;
  min-height: 44px;
  align-items: center;
  justify-content: flex-end;
  gap: 0.55rem;
  border-radius: 999px;
  background: transparent;
  font: 900 0.82rem var(--rounded);
}

.toggle-track {
  position: relative;
  width: 3.2rem;
  height: 1.8rem;
  flex: 0 0 auto;
  border: 3px solid var(--ink);
  border-radius: 999px;
  background: #252b5c;
  box-shadow: inset 0 2px 3px rgb(0 0 0 / 28%);
  transition: background 160ms ease;
}

.toggle-knob {
  position: absolute;
  top: 50%;
  left: 0.2rem;
  width: 1.1rem;
  aspect-ratio: 1;
  border-radius: 50%;
  background: rgb(247 250 255 / 65%);
  box-shadow: 0 2px 4px rgb(0 0 0 / 30%);
  transform: translateY(-50%);
  transition: background 160ms ease, transform 160ms ease;
}

.toggle-button[aria-pressed="true"] .toggle-track {
  background: var(--mint);
}

.toggle-button[aria-pressed="true"] .toggle-knob {
  background: var(--cream);
  transform: translate(1.35rem, -50%);
}

.game-screen {
  place-items: center;
  background: #04071a;
}

.canvas-stage {
  position: relative;
  width: 100%;
  max-height: 100%;
  aspect-ratio: 16 / 9;
  background: var(--night);
}

#game-canvas {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--night);
  object-fit: contain;
  touch-action: none;
}

.pause-button {
  position: absolute;
  z-index: 4;
  top: max(clamp(0.55rem, 1.5vw, 1rem), env(safe-area-inset-top));
  right: max(clamp(0.55rem, 1.5vw, 1rem), env(safe-area-inset-right));
  display: grid;
  width: clamp(44px, 5vw, 58px);
  aspect-ratio: 1;
  place-items: center;
  border: 3px solid var(--ink);
  border-radius: 50%;
  background: rgb(37 45 108 / 88%);
  box-shadow: 0 4px 0 rgb(7 11 37 / 70%);
  backdrop-filter: blur(8px);
}

.pause-button span,
.pause-button span::after {
  width: 0.34rem;
  height: 1.05rem;
  border-radius: 0.12rem;
  background: var(--cream);
  content: "";
}

.pause-button span {
  position: relative;
  transform: translateX(-0.28rem);
}

.pause-button span::after {
  position: absolute;
  left: 0.56rem;
}

.touch-controls {
  position: absolute;
  z-index: 5;
  right: max(0.75rem, env(safe-area-inset-right));
  bottom: max(0.75rem, env(safe-area-inset-bottom));
  left: max(0.75rem, env(safe-area-inset-left));
  display: none;
  align-items: flex-end;
  justify-content: space-between;
  pointer-events: none;
}

.touch-cluster {
  display: flex;
  align-items: flex-end;
  gap: clamp(0.45rem, 1.8vw, 0.9rem);
}

.touch-cluster button {
  display: grid;
  width: clamp(52px, 9vw, 72px);
  aspect-ratio: 1;
  place-items: center;
  border: 3px solid rgb(142 246 208 / 78%);
  border-radius: 50%;
  color: var(--cream);
  background: rgb(16 23 58 / 72%);
  box-shadow: 0 5px 0 rgb(7 11 37 / 72%), inset 0 1px 0 rgb(255 255 255 / 12%);
  font: 900 clamp(1.15rem, 3vw, 1.5rem)/1 var(--rounded);
  pointer-events: auto;
  user-select: none;
  backdrop-filter: blur(8px);
}

.touch-cluster-action button:last-child {
  border-color: rgb(244 111 145 / 86%);
  background: rgb(113 37 75 / 76%);
}

.touch-cluster button:active,
.touch-cluster button.is-pressed {
  color: var(--night);
  background: var(--mint-light);
  box-shadow: inset 0 3px 4px rgb(7 11 37 / 24%);
  transform: translateY(4px) scale(0.96);
}

.overlay-screen {
  z-index: 10;
  place-items: center;
  padding: 1rem;
  background: rgb(5 9 31 / 72%);
  backdrop-filter: blur(12px) saturate(0.8);
}

.overlay-card {
  position: relative;
  display: grid;
  width: min(86%, 520px);
  justify-items: center;
  padding: clamp(1.55rem, 4.5vw, 3rem);
  overflow: hidden;
  border: clamp(3px, 0.55vw, 7px) solid var(--ink);
  border-radius: clamp(1.4rem, 3vw, 2.2rem);
  background:
    radial-gradient(circle at 50% -10%, rgb(88 225 197 / 22%), transparent 42%),
    linear-gradient(145deg, #30387d, #151b45);
  box-shadow:
    0 24px 70px rgb(0 0 0 / 60%),
    inset 0 0 0 3px rgb(89 99 179 / 72%);
  text-align: center;
  animation: overlay-in 220ms ease-out both;
}

.overlay-orb {
  width: clamp(3rem, 7vw, 4.8rem);
  aspect-ratio: 1;
  margin-bottom: 0.75rem;
  border: 4px solid var(--ink);
  border-radius: 50%;
  background:
    radial-gradient(circle at 34% 28%, white 0 7%, transparent 8%),
    linear-gradient(145deg, var(--mint-light), #39d5ce 62%, #2597c3);
  box-shadow: 0 0 24px rgb(88 225 197 / 55%);
}

.overlay-body {
  max-width: 36ch;
  margin: 0.8rem 0 0;
  color: rgb(247 250 255 / 76%);
  font-size: clamp(0.86rem, 1.6vw, 1rem);
}

.overlay-body p {
  margin: 0.35rem 0;
}

.overlay-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.7rem;
  margin-top: clamp(1.1rem, 2.5vw, 1.6rem);
}

.toast {
  position: absolute;
  z-index: 30;
  right: 50%;
  bottom: max(1rem, env(safe-area-inset-bottom));
  max-width: min(86%, 34rem);
  padding: 0.7rem 1rem;
  border: 2px solid rgb(142 246 208 / 55%);
  border-radius: 999px;
  color: var(--cream);
  background: rgb(7 11 37 / 92%);
  box-shadow: 0 8px 30px rgb(0 0 0 / 38%);
  font: 800 clamp(0.75rem, 1.25vw, 0.9rem)/1.3 var(--rounded);
  text-align: center;
  opacity: 0;
  pointer-events: none;
  transform: translate(50%, 1rem);
  transition: opacity 160ms ease, transform 160ms ease;
}

.toast.is-visible,
.toast:not(:empty) {
  opacity: 1;
  transform: translate(50%, 0);
}

.noscript-message {
  position: fixed;
  z-index: 200;
  right: 1rem;
  bottom: 1rem;
  left: 1rem;
  margin: 0;
  padding: 1rem;
  border: 2px solid var(--coral);
  border-radius: 1rem;
  color: var(--cream);
  background: var(--glass-strong);
  font-weight: 800;
  text-align: center;
}

@keyframes float-in {
  from {
    opacity: 0;
    transform: translateY(-0.8rem) scale(0.96);
  }
}

@keyframes overlay-in {
  from {
    opacity: 0;
    transform: translateY(1rem) scale(0.96);
  }
}

@media (hover: hover) {
  .asset-button:hover {
    filter: drop-shadow(0 10px 12px rgb(5 9 31 / 26%)) drop-shadow(0 0 12px rgb(142 246 208 / 18%));
    transform: translateY(-2px) scale(1.015);
  }
}

@media (pointer: coarse) {
  .touch-controls {
    display: flex;
  }
}

@media (max-width: 740px), (max-height: 540px) {
  .brand-lockup {
    width: min(50vw, 420px);
  }

  .brand-mark {
    width: clamp(46px, 7vw, 72px);
  }

  .brand-title {
    width: min(43vw, 350px);
  }

  .asset-button {
    width: clamp(184px, 29vw, 260px);
  }

  .menu-footer {
    justify-content: center;
  }

  .menu-footer > p:first-child {
    display: none;
  }

  .panel-shell {
    width: min(94%, 960px);
    max-height: 94%;
  }

  .setting-row {
    min-height: 58px;
  }
}

@media (max-aspect-ratio: 4 / 5) {
  body {
    overflow: hidden;
  }

  .game-frame {
    width: 100vw;
    height: 100svh;
    max-height: none;
    aspect-ratio: auto;
    border: 0;
    border-radius: 0;
  }

  .menu-screen {
    grid-template-rows: auto 1fr auto;
    padding:
      max(1rem, env(safe-area-inset-top))
      max(0.85rem, env(safe-area-inset-right))
      max(0.85rem, env(safe-area-inset-bottom))
      max(0.85rem, env(safe-area-inset-left));
  }

  .brand-lockup {
    width: min(92vw, 500px);
  }

  .brand-mark {
    width: clamp(58px, 20vw, 92px);
  }

  .brand-title {
    width: min(73vw, 410px);
  }

  .menu-content {
    width: 100%;
    gap: 0.7rem;
    transform: none;
  }

  .menu-actions {
    width: 100%;
    gap: 0.45rem;
  }

  .asset-button {
    width: min(82vw, 360px);
  }

  .menu-footer {
    width: auto;
    padding-inline: 1rem;
  }

  .selection-screen {
    padding:
      max(0.7rem, env(safe-area-inset-top))
      max(0.7rem, env(safe-area-inset-right))
      max(0.7rem, env(safe-area-inset-bottom))
      max(0.7rem, env(safe-area-inset-left));
  }

  .panel-shell {
    width: 100%;
    max-height: 100%;
    padding: clamp(1rem, 5vw, 1.5rem);
    border-width: 3px;
  }

  .level-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .level-grid button {
    min-height: clamp(44px, 13vw, 58px);
  }

  .settings-panel {
    align-content: center;
  }

  .setting-row {
    min-height: 76px;
  }

  .game-screen {
    align-content: center;
  }

  .canvas-stage {
    width: 100%;
    height: auto;
    max-height: none;
  }

  .touch-controls {
    display: flex;
  }

  .touch-cluster button {
    width: clamp(56px, 17vw, 72px);
  }

  .overlay-card {
    width: min(94%, 520px);
  }
}

@media (max-width: 420px) {
  .eyebrow {
    letter-spacing: 0.13em;
  }

  .panel-heading > p:last-child {
    display: none;
  }

  .level-panel {
    gap: 0.65rem;
  }

  .settings-panel {
    gap: 0.75rem;
  }

  .setting-row {
    gap: 0.6rem;
    padding: 0.65rem 0.75rem;
  }

  .setting-row p {
    max-width: 22ch;
  }

  .toggle-button {
    min-width: 5.7rem;
  }

  .toggle-label {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
  }

  .overlay-actions {
    display: grid;
    width: 100%;
  }
}

:root[data-reduced-motion="true"] *,
:root[data-reduced-motion="true"] *::before,
:root[data-reduced-motion="true"] *::after {
  scroll-behavior: auto !important;
  animation-duration: 0.01ms !important;
  animation-iteration-count: 1 !important;
  transition-duration: 0.01ms !important;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media (forced-colors: active) {
  .screen,
  .panel-shell,
  .setting-row,
  .overlay-card {
    forced-color-adjust: none;
  }

  button:focus-visible,
  canvas:focus-visible,
  a:focus-visible {
    outline: 3px solid CanvasText;
  }
}