/* Shared design scale. Theme colors retain the catalog's existing names. */
:root {
  --accent: #587f60;
  --paper: #f3f5ee;
  --ink: #34483b;
  --dim: #869789;
  --board: #c9d7bc;
  --edge: #a3b795;
  --slot: #e4ebd9;
  --card: #f8faee;
  --line: #dce4d5;
  --button: #fbfcf6;
  --glow: #becdad;

  --font-ui: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans CJK SC', 'Microsoft YaHei', sans-serif;
  --font-numeric: var(--font-ui);
  --text-xs: 11px;
  --text-sm: 13px;
  --text-md: 14px;
  --text-body: 16px;
  --text-title: 24px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --radius-control: 12px;
  --radius-card: 16px;
  --radius-panel: 24px;
  --radius-board: 20px;
  --radius-tile: 12px;
  --radius-pill: 999px;
  --control-height: 44px;
  --duration-ui: 160ms;
  --ease-ui: cubic-bezier(0.2, 0.7, 0.3, 1);

  --gap: 11px;
  --pad: 14px;
  --cell: calc((100% - 2 * var(--pad) - 3 * var(--gap)) / 4);
}

/* Resolve aliases here, where game.js applies each world's color palette. */
body {
  --ui-text: var(--ink);
  --ui-muted: color-mix(in srgb, var(--ink) 90%, var(--paper));
  --ui-border: color-mix(in srgb, var(--ink) 16%, var(--paper));
  --ui-border-strong: color-mix(in srgb, var(--ink) 65%, var(--paper));
  --ui-surface: var(--button);
  --ui-soft: var(--slot);
  --ui-accent: var(--ui-action);
  --ui-action: color-mix(in srgb, var(--accent) 75%, var(--ink));
  --ui-on-action: #fff;
  --shadow-control: 0 1px 2px color-mix(in srgb, var(--ink) 7%, transparent);
  --shadow-selection: 0 0 0 2px color-mix(in srgb, var(--ui-action) 12%, transparent);
  --shadow-panel: 0 24px 70px color-mix(in srgb, var(--ink) 22%, transparent);
  --shadow-board: inset 0 1px 0 #ffffffb3,
    0 6px 0 var(--edge),
    0 14px 20px -12px color-mix(in srgb, var(--ink) 28%, transparent);
  --shadow-slot: inset 0 1px 3px color-mix(in srgb, var(--edge) 18%, transparent);
  --shadow-tile: inset 0 1px 0 #fff,
    0 2px 0 color-mix(in srgb, var(--edge) 35%, var(--card)),
    0 4px 6px -3px color-mix(in srgb, var(--ink) 24%, transparent);
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  min-height: 100dvh;
  background: var(--paper);
  color: var(--ui-text);
  font-family: var(--font-ui);
  font-size: var(--text-body);
  transition:
    background 0.3s,
    color 0.3s;
}
.ambient {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background: radial-gradient(
    ellipse at 50% 50%,
    color-mix(in srgb, var(--glow) 25%, transparent),
    transparent 64%
  );
}
button,
a {
  -webkit-tap-highlight-color: transparent;
}
button {
  font: inherit;
  min-width: var(--control-height);
  min-height: var(--control-height);
  touch-action: manipulation;
  cursor: pointer;
  transition:
    background var(--duration-ui),
    border-color var(--duration-ui),
    transform var(--duration-ui) var(--ease-ui),
    color var(--duration-ui);
}
button:focus-visible,
a:focus-visible,
select:focus-visible,
summary:focus-visible {
  outline: 3px solid var(--ui-action);
  outline-offset: 4px;
}
button:disabled {
  opacity: 0.45;
  cursor: default;
}
.primary,
.secondary,
.icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 10px 14px;
  border: 1px solid var(--ui-border);
  border-radius: var(--radius-control);
  background: var(--ui-surface);
  color: var(--ui-text);
  box-shadow: var(--shadow-control);
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1.2;
}
.primary {
  background: var(--ui-action);
  border-color: var(--ui-action);
  color: var(--ui-on-action);
}
@media (hover: hover) {
  :is(.secondary, .icon-button):hover:not(:disabled) {
    background: color-mix(in srgb, var(--ui-action) 6%, var(--ui-surface));
    border-color: var(--ui-action);
  }
  .primary:hover:not(:disabled) {
    background: color-mix(in srgb, var(--ui-action) 88%, black);
  }
}
:is(.primary, .secondary, .icon-button):active:not(:disabled) {
  transform: translateY(1px);
}
.topbar {
  max-width: 1240px;
  margin: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-3) var(--space-8);
}
.brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--ui-text);
  font-size: var(--text-md);
  letter-spacing: 0.3px;
  font-weight: 650;
}
.brand > span {
  font-size: 24px;
  color: var(--ui-action);
}
.header-actions {
  display: flex;
  gap: 9px;
}
.language-select {
  min-height: var(--control-height);
  padding: var(--space-2);
  border: 1px solid var(--ui-border-strong);
  border-radius: var(--radius-control);
  color: var(--ui-text);
  background: var(--ui-surface);
  font: inherit;
  font-size: var(--text-sm);
  cursor: pointer;
}
.brand > .brand-name { font-size: inherit; color: inherit; }
.icon-button {
  padding: var(--space-2) var(--space-3);
  font-size: 18px;
}
.icon-button > span {
  font-size: var(--text-xs);
}
.icon-button[aria-pressed='true'] {
  color: var(--ui-action);
  border-color: var(--ui-action);
  background: color-mix(in srgb, var(--ui-action) 6%, var(--ui-surface));
}
main {
  max-width: clamp(340px, calc(100svh - 400px), 520px);
  padding: 0 var(--space-5);
  margin: 0 auto var(--space-4);
}
.hud {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-3);
  margin: 0 0 var(--space-3);
}
.hud > div:first-child {
  min-width: 0;
}
.eyebrow {
  font-size: var(--text-xs);
  line-height: 1.4;
  font-weight: 600;
  letter-spacing: 0.6px;
  color: var(--ui-action);
}
h1 {
  font-size: var(--text-title);
  letter-spacing: 0;
  line-height: 1.25;
  font-weight: 650;
  margin: var(--space-1) 0 0;
}
.scores {
  display: flex;
  gap: var(--space-2);
  flex-shrink: 0;
}
.score-box {
  position: relative;
  min-width: 64px;
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--ui-border);
  border-radius: var(--radius-control);
  background: var(--ui-surface);
  text-align: center;
}
.score-box > span {
  font-size: var(--text-xs);
  letter-spacing: 0;
  color: var(--ui-muted);
}
.score-box strong {
  display: block;
  font: 650 28px / 1.1 var(--font-numeric);
  font-variant-numeric: tabular-nums;
  margin-top: 2px;
}
.best > strong {
  color: var(--ui-muted);
}
.score-box b {
  position: absolute;
  top: 8px;
  left: 0;
  right: 0;
  color: var(--ui-action);
  font-size: 17px;
  opacity: 0;
  pointer-events: none;
}
.score-box b.animate {
  animation: gain 0.8s ease-out;
}
.board-wrap {
  position: relative;
  perspective: 1200px;
  padding: 4px 0 20px;
}
.board {
  width: 100%;
  aspect-ratio: 1;
  position: relative;
  touch-action: none;
  user-select: none;
  border-radius: var(--radius-board);
  background: var(--board);
  transform: rotateX(4deg);
  transform-style: preserve-3d;
  box-shadow: var(--shadow-board);
  outline: none;
}
.board:focus-visible {
  outline: 3px solid var(--ui-action);
  outline-offset: 7px;
}
.grid {
  position: absolute;
  inset: var(--pad);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(4, 1fr);
  gap: var(--gap);
}
.grid > div {
  border-radius: var(--radius-tile);
  background: var(--slot);
  box-shadow: var(--shadow-slot);
}
.tile {
  position: absolute;
  left: calc(var(--pad) + var(--x) * (var(--cell) + var(--gap)));
  top: calc(var(--pad) + var(--y) * (var(--cell) + var(--gap)));
  width: var(--cell);
  height: var(--cell);
  z-index: 2;
  transition:
    left 145ms cubic-bezier(0.18, 0.72, 0.24, 1),
    top 145ms cubic-bezier(0.18, 0.72, 0.24, 1);
  will-change: left, top;
}
.tile-inner {
  width: 100%;
  height: 100%;
  border-radius: var(--radius-tile);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  background: linear-gradient(150deg, #fff, var(--card));
  box-shadow: var(--shadow-tile);
  position: relative;
  transform: translateY(-3px);
}
.world-sprite {
  width: 87%;
  height: 87%;
  flex-shrink: 0;
  overflow: visible;
  transform-origin: 50% 80%;
  margin-top: -5px;
}
.tile-label {
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.1px;
  line-height: 1;
  padding-bottom: 5px;
  color: var(--ui-muted);
  margin-top: -3px;
  white-space: nowrap;
}
.tile.spawn .tile-inner {
  animation: tile-spawn 250ms cubic-bezier(0.2, 0.75, 0.3, 1.2);
}
.tile.merge {
  z-index: 3;
}
.tile.merge .tile-inner {
  animation: tile-merge 330ms cubic-bezier(0.2, 0.7, 0.3, 1);
}
.tile.merge .world-sprite {
  animation: sprite-bounce 430ms ease-out;
}
.tile.merge::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 2px solid var(--accent);
  border-radius: var(--radius-tile);
  pointer-events: none;
  animation: merge-ring 0.5s ease-out forwards;
}
.game-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 0 3px;
  margin-top: 5px;
}
.site-footer {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-5);
  padding: var(--space-4) var(--space-4) var(--space-8);
  font-size: var(--text-sm);
}
.site-footer a { color: var(--ui-muted); text-underline-offset: 3px; }
.controls-hint {
  text-align: center;
  color: var(--ui-muted);
  font-size: var(--text-xs);
  letter-spacing: 0.5px;
  margin: 19px 0;
}
.controls-hint span {
  margin: 0 10px;
  opacity: 0.5;
}
#journey-dots {
  display: flex;
  gap: 5px;
  align-items: center;
  justify-content: center;
}
#journey-dots i {
  display: block;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--line);
}
#journey-dots i.found {
  background: var(--accent);
}
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}
.discovery-toast {
  position: absolute;
  bottom: 35px;
  left: 50%;
  transform: translate(-50%, 10px);
  background: var(--ui-surface);
  border: 1px solid var(--ui-border);
  border-radius: var(--radius-pill);
  box-shadow: 0 5px 18px color-mix(in srgb, var(--edge) 30%, transparent);
  padding: 10px 18px;
  white-space: nowrap;
  font-size: var(--text-xs);
  letter-spacing: 0.6px;
  opacity: 0;
  pointer-events: none;
  z-index: 5;
  color: var(--ui-action);
}
.discovery-toast.show {
  animation: toast 2.8s ease both;
}
#particles {
  position: absolute;
  inset: -15px;
  pointer-events: none;
  z-index: 4;
  overflow: hidden;
}
.particle {
  position: absolute;
  width: 7px;
  height: 7px;
  background: var(--accent);
  animation: particle 0.5s ease-out forwards;
  border-radius: 2px;
}
.overlay {
  position: absolute;
  inset: 7% 4%;
  border: 1px solid var(--ui-border);
  border-radius: var(--radius-panel);
  background: color-mix(in srgb, var(--paper) 93%, transparent);
  backdrop-filter: blur(8px);
  z-index: 10;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 25px;
  box-shadow: var(--shadow-panel);
}
.overlay[hidden] {
  display: none;
}
.overlay > span {
  font-size: 44px;
  color: var(--ui-action);
}
h2 {
  font-size: var(--text-title);
  line-height: 1.3;
  font-weight: 600;
  margin: 14px 0;
}
.overlay p {
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--ui-muted);
}
.overlay .primary {
  margin-top: 14px;
}
dialog {
  background: var(--paper);
  color: var(--ui-text);
  border: 1px solid var(--ui-border);
  border-radius: var(--radius-panel);
  padding: var(--dialog-pad, var(--space-6));
  max-width: calc(100% - 28px);
  box-shadow: var(--shadow-panel);
}
dialog::backdrop {
  background: color-mix(in srgb, var(--ink) 32%, transparent);
  backdrop-filter: blur(5px);
}
dialog p {
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--ui-muted);
}
.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 23px;
}
.field-guide {
  width: 740px;
  max-height: 90dvh;
}
.guide-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.guide-top h2 {
  margin: 9px 0;
}
.guide-intro {
  font-size: var(--text-sm);
}
#guide-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 8px;
  margin: 20px 0;
}
.guide-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  border: 1px solid var(--ui-border);
  background: var(--ui-surface);
  border-radius: var(--radius-card);
  padding: var(--space-2) var(--space-1);
  color: var(--ui-text);
}
.guide-item svg {
  width: 62px;
  height: 67px;
}
.guide-item strong {
  font-size: var(--text-xs);
  font-weight: 500;
}
.guide-item > span:not(.discovery-mask) {
  font-size: var(--text-xs);
  margin-top: 5px;
  color: var(--ui-muted);
}
.discovery-mask {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 54px;
  max-width: 100%;
  height: 58px;
  flex-shrink: 0;
  border: 1px dashed var(--ui-border-strong);
  border-radius: var(--radius-control);
  background: repeating-linear-gradient(135deg, transparent 0 6px, var(--ui-border) 6px 7px), var(--ui-soft);
  color: var(--ui-muted);
}
.discovery-mask svg {
  width: 24px;
  height: 24px;
}
.guide-item > .discovery-mask {
  margin: 4px 0 5px;
}
.guide-item.is-locked {
  color: var(--ui-muted);
}
.guide-detail-icon .discovery-mask {
  width: 100%;
  height: 100%;
}
.guide-detail-icon .discovery-mask svg {
  width: 28px;
  height: 28px;
}
.guide-item[aria-pressed='true'] {
  border-color: var(--ui-action);
  box-shadow: var(--shadow-selection);
}
#guide-detail {
  display: flex;
  align-items: center;
  gap: 15px;
  background: var(--ui-soft);
  padding: var(--space-4);
  border-radius: var(--radius-card);
}
.guide-detail-icon {
  width: 70px;
  height: 77px;
  flex-shrink: 0;
}
.guide-detail-icon svg {
  width: 100%;
  height: 100%;
}
.detail-tag {
  font-size: var(--text-xs);
  letter-spacing: 1px;
  color: var(--ui-action);
}
#guide-detail h3 {
  font-size: 16px;
  margin: 7px 0;
}
#guide-detail h3 small {
  font-size: var(--text-xs);
  font-weight: 400;
  color: var(--ui-muted);
}
#guide-detail p {
  margin: 0;
}
.science-note {
  font-size: var(--text-xs);
}
.learn-more {
  font-size: var(--text-xs);
  color: var(--ui-action);
  text-underline-offset: 3px;
}
.learn-more[hidden] {
  display: none;
}
@keyframes tile-spawn {
  0% {
    opacity: 0;
    transform: translateY(7px) scale(0.6);
  }
  70% {
    opacity: 1;
    transform: translateY(-6px) scale(1.035);
  }
  100% {
    transform: translateY(-3px) scale(1);
  }
}
@keyframes tile-merge {
  0%,
  100% {
    transform: translateY(-3px) scale(1);
  }
  40% {
    transform: translateY(-9px) scale(1.07);
  }
  70% {
    transform: translateY(-1px) scale(0.985);
  }
}
@keyframes sprite-bounce {
  0%,
  100% {
    transform: rotate(0);
  }
  35% {
    transform: rotate(-7deg) translateY(-3px);
  }
  65% {
    transform: rotate(3deg);
  }
}
@keyframes merge-ring {
  0% {
    opacity: 0.4;
    transform: scale(0.95);
  }
  100% {
    opacity: 0;
    transform: scale(1.2);
  }
}
@keyframes gain {
  0% {
    opacity: 1;
    transform: translateY(0);
  }
  100% {
    opacity: 0;
    transform: translateY(-38px);
  }
}
@keyframes toast {
  0%,
  100% {
    opacity: 0;
    transform: translate(-50%, 10px);
  }
  12%,
  80% {
    opacity: 1;
    transform: translate(-50%, 0);
  }
}
@keyframes particle {
  to {
    transform: translate(var(--dx), var(--dy)) rotate(90deg);
    opacity: 0;
  }
}
/* Shared touch behavior and modal containment. */
html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}
body {
  padding: env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom)
    env(safe-area-inset-left);
}
html:has(dialog[open]),
body:has(dialog[open]) {
  overflow: hidden;
}
.brand {
  min-height: var(--control-height);
}
dialog {
  --dialog-pad: var(--space-6);
  max-height: calc(100dvh - env(safe-area-inset-top) - env(safe-area-inset-bottom) - 24px);
  overflow-y: auto;
  overscroll-behavior: contain;
  scroll-padding-top: 88px;
}
.field-guide {
  padding: var(--dialog-pad);
}
.guide-top {
  position: sticky;
  top: 0;
  z-index: 3;
  margin: calc(-1 * var(--dialog-pad)) calc(-1 * var(--dialog-pad)) 12px;
  padding: 12px var(--dialog-pad);
  gap: 12px;
  background: var(--paper);
  border-bottom: 1px solid var(--ui-border);
}
.guide-top > div {
  min-width: 0;
}
.guide-top .icon-button {
  flex-shrink: 0;
}
.board {
  -webkit-user-select: none;
  -webkit-touch-callout: none;
}
#particles {
  inset: 0;
  overflow: hidden;
  border-radius: var(--radius-board);
}
.discovery-toast {
  max-width: calc(100% - 20px);
  overflow: hidden;
  text-overflow: ellipsis;
}
.controls-hint .hint-keyboard,
.controls-hint .hint-touch {
  margin: 0;
  opacity: 1;
}
.controls-hint .hint-touch {
  display: none;
}
@media (pointer: coarse), (max-width: 600px) {
  .controls-hint .hint-keyboard {
    display: none;
  }
  .controls-hint .hint-touch {
    display: inline;
  }
}
@media (min-width: 601px) and (min-height: 541px) and (max-height: 760px) {
  .topbar {
    padding-block: 13px;
  }
  .controls-hint {
    margin-block: 14px;
  }
  .hud {
    margin-bottom: 8px;
  }
}

/* Portrait phones: preserve readable labels and reserve space for both action rows. */
@media (max-width: 600px) {
  .topbar {
    min-height: 60px;
    padding: 8px 16px;
    gap: 8px;
  }
  .brand {
    font-size: var(--text-sm);
    letter-spacing: 0.3px;
    gap: 6px;
    white-space: nowrap;
  }
  .brand > span {
    font-size: 22px;
  }
  .header-actions {
    gap: 6px;
  }
  .icon-button {
    padding: 8px 10px;
    font-size: 16px;
  }
  main {
    width: 100%;
    max-width: 450px;
    min-width: 0;
    padding: 0 16px;
    margin: 0 auto 8px;
  }
  .hud {
    min-height: 48px;
    gap: 12px;
    margin: 0 2px 8px;
  }
  .hud > div:first-child {
    min-width: 0;
  }
  h1 {
    font-size: 21px;
    letter-spacing: 0.5px;
    margin-top: 4px;
    line-height: 1.25;
  }
  .eyebrow {
    font-size: var(--text-xs);
    letter-spacing: 1px;
  }
  .scores {
    gap: var(--space-2);
    flex-shrink: 0;
  }
  .score-box {
    min-width: 54px;
    padding: 4px 8px;
  }
  .score-box > span {
    font-size: 11px;
    letter-spacing: 0.5px;
  }
  .score-box strong {
    font-size: 24px;
  }
  .board-wrap {
    width: min(100%, max(230px, calc(100svh - 328px - env(safe-area-inset-top) - env(safe-area-inset-bottom))));
    margin: 0 auto;
    padding: 4px 0 14px;
  }
  .board {
    border-radius: var(--radius-board);
    transform: rotateX(3deg);
  }
  .tile-label {
    font-size: 8px;
  }
  .game-actions {
    gap: 8px;
    padding: 0;
    max-width: 400px;
    margin: 4px auto 0;
  }
  .secondary {
    font-size: var(--text-sm);
    padding: 9px 12px;
  }
  #journey-dots {
    gap: 4px;
    flex-shrink: 0;
  }
  #journey-dots i {
    width: 3px;
    height: 3px;
  }
  .controls-hint {
    font-size: 11px;
    margin: 8px 0 0;
    line-height: 1.5;
    letter-spacing: 0;
  }
  .field-guide {
    --dialog-pad: var(--space-4);
    max-width: calc(100% - 20px);
  }
  .guide-top h2 {
    font-size: 20px;
  }
  .guide-top .eyebrow {
    font-size: var(--text-xs);
    letter-spacing: 0.8px;
  }
  .guide-intro {
    font-size: var(--text-sm);
  }
  #guide-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 6px;
    margin: 12px 0;
  }
  .guide-item > svg {
    max-width: 100%;
    height: 61px;
  }
  .guide-item strong {
    font-size: var(--text-xs);
    overflow-wrap: anywhere;
  }
  .guide-item > span:not(.discovery-mask) {
    font-size: var(--text-xs);
  }
  #guide-detail {
    gap: 10px;
    padding: 12px;
  }
  .guide-detail-icon {
    width: 48px;
    height: 55px;
  }
  #guide-detail h3 {
    font-size: 16px;
  }
  #guide-detail h3 small {
    display: block;
    margin-top: 4px;
  }
  #guide-detail p {
    font-size: var(--text-sm);
  }
  .dialog-actions {
    flex-wrap: wrap;
  }
  .learn-more {
    display: inline-flex;
    align-items: center;
    min-height: var(--control-height);
    padding: 10px 0;
    font-size: var(--text-sm);
  }
}
@media (max-width: 380px) {
  .topbar { padding-inline: 12px; }
  .topbar .brand > span:first-child:not(.brand-name) { display: none; }
  .topbar .header-actions { gap: 4px; }
  .topbar .icon-button { padding-inline: 6px; }
  .topbar .language-select { max-width: 64px; padding-inline: 4px; }
}
@media (max-width: 370px) {
  :root {
    --gap: 8px;
    --pad: 11px;
  }
  .topbar {
    padding-inline: 12px;
  }
  .header-actions {
    gap: 4px;
  }
  .icon-button {
    padding-inline: 8px;
    gap: 5px;
  }
  .hud {
    gap: 8px;
  }
  h1 {
    font-size: 20px;
  }
  .scores {
    gap: 10px;
  }
  .secondary {
    padding-inline: 10px;
  }
  #journey-dots {
    gap: 3px;
  }
  #guide-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
@media (max-height: 640px) and (orientation: portrait) and (max-width: 600px) {
  .topbar {
    min-height: 54px;
    padding-block: 5px;
  }
  .hud {
    min-height: 46px;
    margin-bottom: 6px;
  }
  .board-wrap {
    padding-bottom: 12px;
  }
  .hud .eyebrow {
    display: none;
  }
  .tile-label {
    display: none;
  }
  .world-sprite {
    width: 94%;
    height: 94%;
    margin: 0;
  }
  .controls-hint {
    margin-top: 6px;
  }
}

/* Compact landscape: all controls share the left column, the board occupies the right. */
@media (orientation: landscape) and (max-height: 540px) and (max-width: 1100px) {
  .topbar {
    min-height: 52px;
    padding: 4px 20px;
  }
  .brand {
    font-size: var(--text-sm);
    letter-spacing: 0.3px;
  }
  .icon-button {
    padding: 8px 10px;
  }
  main {
    display: grid;
    grid-template-columns: minmax(210px, 260px) minmax(0, calc(100svh - 86px - env(safe-area-inset-top) - env(safe-area-inset-bottom)));
    grid-template-rows: repeat(5, auto);
    column-gap: 28px;
    row-gap: 4px;
    align-items: center;
    align-content: center;
    justify-content: center;
    max-width: 900px;
    width: 100%;
    padding: 0 20px;
    margin: 0 auto 8px;
  }
  .game {
    display: contents;
  }
  main > .theme-picker {
    grid-column: 1;
    grid-row: 1;
    margin: 0;
  }
  .hud {
    grid-column: 1;
    grid-row: 2;
    gap: 10px;
    margin: 0;
    min-height: 46px;
  }
  .hud > div:first-child {
    min-width: 0;
  }
  h1 {
    font-size: 19px;
    letter-spacing: 0.5px;
    line-height: 1.2;
    margin-top: 4px;
  }
  .eyebrow {
    font-size: var(--text-xs);
    letter-spacing: 0.5px;
  }
  .scores {
    gap: 12px;
    flex-shrink: 0;
  }
  .score-box > span {
    font-size: var(--text-xs);
    letter-spacing: 0.5px;
  }
  .score-box strong {
    font-size: 23px;
  }
  .board-wrap {
    grid-column: 2;
    grid-row: 1 / 6;
    align-self: center;
    width: 100%;
    min-width: 0;
    margin: 0;
    padding: 3px 0 15px;
  }
  .board {
    transform: rotateX(3deg);
  }
  .tile-label {
    font-size: 7px;
  }
  .game-actions {
    grid-column: 1;
    grid-row: 3;
    flex-wrap: wrap;
    gap: 4px;
    padding: 0;
    margin: 0;
    width: 100%;
  }
  .secondary {
    font-size: 12px;
    padding: 8px 10px;
  }
  #journey-dots {
    order: 3;
    width: 100%;
    margin-top: 2px;
    gap: 4px;
  }
  main .social-actions {
    grid-column: 1;
    grid-row: 4;
    margin: 0;
    padding-top: 0;
  }
  .controls-hint {
    grid-column: 1;
    grid-row: 5;
    font-size: 11px;
    line-height: 1.4;
    letter-spacing: 0;
    margin: 0;
    text-align: center;
  }
  .controls-hint .hint-keyboard {
    display: none;
  }
  .controls-hint .hint-touch {
    display: inline;
  }
  #challenge-banner {
    grid-column: 1 / -1;
    grid-row: 6;
  }
  .field-guide {
    --dialog-pad: 14px;
    max-height: calc(100dvh - 16px);
  }
  #guide-grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
  .overlay {
    padding: 12px;
  }
  .overlay > span {
    font-size: 24px;
  }
  .overlay h2 {
    font-size: 18px;
  }
  .overlay p {
    font-size: 11px;
  }
}
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
  .discovery-toast.show {
    animation: none;
    opacity: 1;
    transform: translate(-50%, 0);
  }
}

.overlay-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 10px;
  margin-top: 12px;
}
.overlay-actions .primary {
  margin-top: 0;
}
.overlay-actions [hidden] {
  display: none;
}

/* Theme data controls particle shape and color. */
.particle {
  clip-path: var(--particle-shape);
  background: var(--accent);
}

.sound-review {
  margin-top: 18px;
  border-top: 1px solid var(--ui-border);
  padding-top: 12px;
}
.sound-review summary {
  cursor: pointer;
  min-height: var(--control-height);
  display: flex;
  align-items: center;
  font-size: 12px;
  color: var(--ui-action);
}
.sound-preview {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
/* Character motion uses the chosen lively amplitude; only one root transform. */
body[data-motion='ear'] {
  --merge-motion: character-hop;
}
body[data-motion='tail'] {
  --merge-motion: cat-turn;
}
body[data-motion='paw'] {
  --merge-motion: paw-launch;
}
body[data-motion='roll'] {
  --merge-motion: sleepy-roll;
}
body[data-motion='rubber'] {
  --merge-motion: rubber-pop;
}
body[data-motion]:not([data-motion='default']) .tile.merge .world-sprite {
  animation: none;
}
.character-rig {
  transform-box: fill-box;
  transform-origin: 50% 95%;
}
:is(.tile.merge, .motion-demo) .character-rig {
  animation: var(--merge-motion) var(--motion-duration, 600ms) cubic-bezier(0.18, 0.75, 0.3, 1) both;
}
.motion-ears {
  transform-box: fill-box;
  transform-origin: 50% 12%;
}
.motion-tail {
  transform-box: fill-box;
  transform-origin: 20% 90%;
}
.motion-paws {
  transform-box: fill-box;
  transform-origin: 50% 70%;
}
:is(.tile.merge, .motion-demo) .motion-ears {
  animation: ear-flop 520ms ease-out both;
}
body[data-motion='tail'] :is(.tile.merge, .motion-demo) .motion-tail,
body[data-motion='roll'] :is(.tile.merge, .motion-demo) .motion-tail {
  animation: tail-curl 540ms ease-out both;
}
body[data-motion='paw'] :is(.tile.merge, .motion-demo) .motion-paws {
  animation: paw-kick 460ms ease-out both;
}
body[data-motion='rubber'] :is(.tile.merge, .motion-demo) .motion-tail {
  animation: tail-curl 500ms ease-out both;
}
/* Different trajectories and rhythms, not merely different amplitudes. */
@keyframes character-hop {
  0%,
  12% {
    transform: scale(1.25, 0.72);
  }
  38% {
    transform: translateY(-15px) scale(0.86, 1.15) rotate(-7deg);
  }
  62% {
    transform: scale(1.18, 0.84);
  }
  80% {
    transform: translateY(-5px) rotate(4deg);
  }
  100% {
    transform: none;
  }
}
@keyframes cat-turn {
  0% {
    transform: translateX(-9px) rotate(-20deg);
  }
  30% {
    transform: translateX(10px) skewX(-12deg) scaleX(0.75);
  }
  58% {
    transform: translateX(-4px) rotate(17deg) scale(1.08, 0.93);
  }
  80% {
    transform: rotate(-6deg);
  }
  100% {
    transform: none;
  }
}
@keyframes paw-launch {
  0%,
  18% {
    transform: scale(1.3, 0.66);
  }
  36% {
    transform: translate(7px, -20px) rotate(12deg) scale(0.8, 1.2);
  }
  58% {
    transform: translate(-3px, 2px) scale(1.24, 0.75);
  }
  76% {
    transform: translateX(3px);
  }
  100% {
    transform: none;
  }
}
@keyframes sleepy-roll {
  0%,
  15% {
    transform: rotate(-12deg) scale(1.08, 0.92);
  }
  45% {
    transform: rotate(-65deg) translateY(-4px);
  }
  68% {
    transform: rotate(14deg) translateY(-7px);
  }
  85% {
    transform: rotate(-5deg);
  }
  100% {
    transform: none;
  }
}
@keyframes rubber-pop {
  0% {
    transform: scale(1.4, 0.55);
  }
  24% {
    transform: scale(0.6, 1.4);
  }
  44% {
    transform: scale(1.3, 0.72) skewX(12deg);
  }
  62% {
    transform: scale(0.85, 1.17) skewX(-8deg);
  }
  80% {
    transform: scale(1.08, 0.92);
  }
  100% {
    transform: none;
  }
}
@keyframes ear-flop {
  0%,
  12% {
    transform: rotate(0);
  }
  36% {
    transform: rotate(-19deg) scaleY(0.9);
  }
  65% {
    transform: rotate(13deg);
  }
  84% {
    transform: rotate(-5deg);
  }
  100% {
    transform: none;
  }
}
@keyframes tail-curl {
  0% {
    transform: rotate(-12deg) scaleX(0.8);
  }
  42% {
    transform: rotate(24deg) scaleX(1.16);
  }
  73% {
    transform: rotate(-8deg);
  }
  100% {
    transform: none;
  }
}
@keyframes paw-kick {
  0% {
    transform: scaleX(1.18);
  }
  38% {
    transform: translateY(-4px) rotate(-8deg);
  }
  70% {
    transform: scale(1.16, 0.86);
  }
  100% {
    transform: none;
  }
}
.particle-bubble {
  background: transparent !important;
  border: 1.5px solid var(--accent);
  border-radius: 50%;
  clip-path: none;
}
.particle-spark {
  clip-path: polygon(50% 0, 63% 37%, 100% 50%, 63% 63%, 50% 100%, 37% 63%, 0 50%, 37% 37%);
}
.particle-bolt {
  clip-path: polygon(55% 0, 15% 58%, 44% 55%, 33% 100%, 88% 35%, 57% 40%);
}
.particle-moon {
  background: transparent !important;
  clip-path: none;
  border-radius: 50%;
  box-shadow: inset 3px -2px 0 var(--accent);
  width: 12px;
  height: 12px;
}
.particle-dot {
  clip-path: none;
  border-radius: 50%;
}
#replay-motion {
  margin-top: 12px;
}
#replay-motion[hidden] {
  display: none;
}
@media (prefers-reduced-motion: reduce) {
  :is(.tile.merge, .motion-demo) .character-rig,
  :is(.tile.merge, .motion-demo) .motion-ears,
  :is(.tile.merge, .motion-demo) .motion-tail,
  :is(.tile.merge, .motion-demo) .motion-paws {
    animation: none !important;
  }
  .motion-demo {
    outline: 1px solid var(--accent);
  }
}

/* Material response: the actual card compresses; depth follows contact. */
body[data-motion='ear'] {
  --card-motion: soda-card;
  --motion-duration: 620ms;
}
body[data-motion='tail'] {
  --card-motion: lime-card;
  --motion-duration: 560ms;
}
body[data-motion='paw'] {
  --card-motion: berry-card;
  --motion-duration: 480ms;
}
body[data-motion='roll'] {
  --card-motion: sunset-card;
  --motion-duration: 880ms;
}
body[data-motion='rubber'] {
  --card-motion: ink-card;
  --motion-duration: 740ms;
}
body[data-motion]:not([data-motion='default']) :is(.tile-inner, .guide-detail-icon) {
  --solid-edge: color-mix(in srgb, var(--edge) 35%, var(--card));
  --contact-shadow: color-mix(in srgb, var(--edge) 55%, transparent);
  box-shadow: var(--shadow-tile);
}
body[data-motion]:not([data-motion='default']) .guide-detail-icon {
  position: relative;
  background: linear-gradient(150deg, #fff, var(--card));
  border-radius: var(--radius-tile);
  padding: var(--space-1);
  transform: translateY(-3px);
}
body[data-motion]:not([data-motion='default']) .tile.merge::after {
  display: none;
}
body[data-motion]:not([data-motion='default'])
  :is(.tile.merge .tile-inner, .motion-demo .guide-detail-icon) {
  animation:
    var(--card-motion) var(--motion-duration) cubic-bezier(0.22, 0.61, 0.36, 1) both,
    card-depth var(--motion-duration) ease-out both;
  transform-origin: 50% 100%;
}
@keyframes card-depth {
  0%,
  100% {
    box-shadow: var(--shadow-tile);
  }
  14% {
    box-shadow:
      inset 0 1px 1px #ffffff80,
      0 1px 0 var(--solid-edge),
      0 2px 3px -1px var(--contact-shadow);
  }
  40% {
    box-shadow:
      inset 0 1px 0 #fff,
      0 5px 0 var(--solid-edge),
      0 11px 12px -5px var(--contact-shadow);
  }
  70% {
    box-shadow:
      inset 0 1px 0 #fff,
      0 2px 0 var(--solid-edge),
      0 4px 5px -2px var(--contact-shadow);
  }
}
/* Shape changes belong to the card surface, including its contents and base. */
@keyframes soda-card {
  0%,
  100% {
    transform: translateY(-3px);
    border-radius: var(--radius-tile);
  }
  14% {
    transform: translateY(1px) scale(1.12, 0.76);
    border-radius: 28% 28% 16% 16% / 35% 35% 18% 18%;
  }
  40% {
    transform: translateY(-9px) scale(0.88, 1.16);
    border-radius: 18% 18% 30% 30% / 15% 15% 32% 32%;
  }
  70% {
    transform: translateY(-1px) scale(1.05, 0.92);
    border-radius: 19% / 24%;
  }
  86% {
    transform: translateY(-4px) scale(0.98, 1.025);
    border-radius: 14px;
  }
}
@keyframes lime-card {
  0%,
  100% {
    transform: translateY(-3px);
    border-radius: var(--radius-tile);
  }
  14% {
    transform: translate(-3px, 0) skewX(-10deg) scale(0.97, 0.86);
    border-radius: 32% 10% 30% 10%;
  }
  40% {
    transform: translate(4px, -6px) skewX(9deg) scale(0.92, 1.09);
    border-radius: 10% 32% 10% 30%;
  }
  70% {
    transform: translate(-1px, -2px) skewX(-4deg) scale(1.02, 0.97);
    border-radius: 20% 12% 20% 12%;
  }
}
@keyframes berry-card {
  0%,
  100% {
    transform: translateY(-3px);
    border-radius: var(--radius-tile);
  }
  14% {
    transform: translateY(2px) scale(1.12, 0.72);
    border-radius: 25% 25% 10% 10%;
  }
  40% {
    transform: translateY(-12px) scale(0.9, 1.16);
    border-radius: 12% 12% 28% 28%;
  }
  70% {
    transform: translateY(0) scale(1.08, 0.84);
    border-radius: 24% 24% 12% 12%;
  }
  87% {
    transform: translateY(-4px) scale(0.98, 1.03);
    border-radius: 14px;
  }
}
@keyframes sunset-card {
  0%,
  100% {
    transform: translateY(-3px);
    border-radius: var(--radius-tile);
  }
  14% {
    transform: translateY(0) rotate(-5deg) scale(1.05, 0.85);
    border-radius: 38% 16% 22% 30%;
  }
  40% {
    transform: translateY(-6px) rotate(7deg) scale(0.93, 1.08);
    border-radius: 16% 38% 30% 22%;
  }
  70% {
    transform: translateY(-2px) rotate(-2deg) scale(1.02, 0.96);
    border-radius: 22%;
  }
}
@keyframes ink-card {
  0%,
  100% {
    transform: translateY(-3px);
    border-radius: var(--radius-tile);
  }
  14% {
    transform: translateY(1px) scale(1.14, 0.7);
    border-radius: 35% 35% 14% 14%;
  }
  40% {
    transform: translateY(-8px) scale(0.82, 1.2);
    border-radius: 14% 14% 38% 38%;
  }
  70% {
    transform: translateY(-1px) scale(1.08, 0.86) skewX(3deg);
    border-radius: 30% 22% 18% 26%;
  }
  86% {
    transform: translateY(-4px) scale(0.96, 1.05);
    border-radius: 18%;
  }
}
@media (prefers-reduced-motion: reduce) {
  body[data-motion]:not([data-motion='default'])
    :is(.tile.merge .tile-inner, .motion-demo .guide-detail-icon) {
    animation: none !important;
  }
}
/* Orange puppy grows new anatomy and structures at each merge rank. */
body[data-growth='true'] :is(.tile.merge, .motion-demo) .character-rig {
  animation: none;
}
.growth-story,
.growth-story
  :is(
    .growth-ball,
    .growth-paws,
    .growth-ears,
    .growth-head,
    .growth-body,
    .growth-arms,
    .growth-wheels,
    .growth-sail,
    .growth-canopy,
    .growth-boosters,
    .growth-fins,
    .growth-flame
  ) {
  transform-box: fill-box;
  transform-origin: 50% 100%;
}
body[data-growth='true'] :is(.tile.merge, .motion-demo) .growth-stage-0 {
  animation: seed-bounce 620ms ease-out both;
}
body[data-growth='true'] :is(.tile.merge, .motion-demo) .growth-stage-1 .growth-paws {
  animation: part-unfold 600ms ease-out both;
}
body[data-growth='true'] :is(.tile.merge, .motion-demo) .growth-stage-2 .growth-ears {
  animation: part-unfold 640ms ease-out both;
}
body[data-growth='true'] :is(.tile.merge, .motion-demo) .growth-stage-3 .growth-head {
  animation: puppy-emerge 680ms ease-out both;
}
body[data-growth='true'] :is(.tile.merge, .motion-demo) .growth-stage-4 .growth-body,
body[data-growth='true'] :is(.tile.merge, .motion-demo) .growth-stage-4 .growth-arms {
  animation: part-unfold 660ms ease-out both;
}
body[data-growth='true'] :is(.tile.merge, .motion-demo) .growth-stage-5 {
  animation: seed-bounce 660ms ease-out both;
}
body[data-growth='true'] :is(.tile.merge, .motion-demo) .growth-stage-6 {
  animation: board-skate 660ms ease-out both;
}
body[data-growth='true'] :is(.tile.merge, .motion-demo) .growth-stage-6 .growth-wheels {
  animation: part-unfold 500ms ease-out both;
}
body[data-growth='true'] :is(.tile.merge, .motion-demo) .growth-stage-7 .growth-sail {
  animation: sail-open 720ms ease-out both;
}
body[data-growth='true'] :is(.tile.merge, .motion-demo) .growth-stage-8 .growth-canopy {
  animation: balloon-inflate 760ms ease-out both;
}
body[data-growth='true'] :is(.tile.merge, .motion-demo) .growth-stage-9 .growth-boosters {
  animation: booster-open 680ms ease-out both;
}
body[data-growth='true'] :is(.tile.merge, .motion-demo) .growth-stage-10 {
  animation: rocket-lift 780ms ease-out both;
}
body[data-growth='true'] :is(.tile.merge, .motion-demo) .growth-stage-10 .growth-flame {
  animation: flame-ignite 780ms ease-out both;
}
@keyframes seed-bounce {
  0% {
    transform: scale(1.2, 0.72);
  }
  40% {
    transform: translateY(-14px) scale(0.88, 1.12);
  }
  72% {
    transform: scale(1.08, 0.9);
  }
  100% {
    transform: none;
  }
}
@keyframes part-unfold {
  0% {
    transform: scale(0.15, 0.1);
    opacity: 0.2;
  }
  55% {
    transform: scale(1.18, 1.15);
    opacity: 1;
  }
  78% {
    transform: scale(0.94, 0.96);
  }
  100% {
    transform: none;
    opacity: 1;
  }
}
@keyframes puppy-emerge {
  0% {
    transform: translateY(17px) scale(0.6);
    opacity: 0;
  }
  48% {
    transform: translateY(-5px) rotate(-8deg);
    opacity: 1;
  }
  76% {
    transform: rotate(5deg);
  }
  100% {
    transform: none;
  }
}
@keyframes board-skate {
  0% {
    transform: translateX(-12px) rotate(-9deg);
  }
  50% {
    transform: translateX(9px) rotate(5deg);
  }
  80% {
    transform: translateX(-3px);
  }
  100% {
    transform: none;
  }
}
@keyframes sail-open {
  0% {
    transform: scaleX(0.05) skewY(12deg);
  }
  55% {
    transform: scaleX(1.12) skewY(-5deg);
  }
  100% {
    transform: none;
  }
}
@keyframes balloon-inflate {
  0% {
    transform: scale(0.35, 0.15) translateY(8px);
  }
  55% {
    transform: scale(1.12, 1.1);
  }
  100% {
    transform: none;
  }
}
@keyframes booster-open {
  0% {
    transform: scaleX(0.2) translateY(-8px);
    opacity: 0;
  }
  50% {
    transform: scaleX(1.15);
    opacity: 1;
  }
  100% {
    transform: none;
  }
}
@keyframes rocket-lift {
  0%,
  20% {
    transform: translateY(3px);
  }
  55% {
    transform: translateY(-12px);
  }
  100% {
    transform: none;
  }
}
@keyframes flame-ignite {
  0%,
  15% {
    transform: scaleY(0.1);
    opacity: 0;
  }
  45% {
    transform: scaleY(1.25);
    opacity: 1;
  }
  70% {
    transform: scaleY(0.65);
  }
  100% {
    transform: none;
  }
}
@media (prefers-reduced-motion: reduce) {
  body[data-growth='true'] :is(.tile.merge, .motion-demo) .growth-story,
  body[data-growth='true'] :is(.tile.merge, .motion-demo) .growth-story * {
    animation: none !important;
  }
}
/* Shared play actions and panels use the same UI tokens as the game controls. */
.social-actions {
  display: flex;
  justify-content: center;
  gap: 0;
  border-top: 1px solid var(--ui-border);
  padding-top: var(--space-2);
  margin-top: 10px;
}
.social-actions .secondary {
  flex: 1;
  border: 0;
  background: transparent;
  box-shadow: none;
  color: var(--ui-muted);
}
.social-actions .secondary + .secondary {
  border-left: 1px solid var(--ui-border);
  border-radius: 0;
}
.social-actions span {
  color: var(--ui-accent);
  font-size: 19px;
  margin-right: var(--space-2);
}
#challenge-banner {
  text-align: center;
  padding: var(--space-3);
  margin-top: var(--space-3);
  background: var(--ui-soft);
  border-radius: var(--radius-card);
  font-size: var(--text-sm);
}
#challenge-banner[hidden],
.social-dialog [hidden] {
  display: none !important;
}
.social-dialog {
  width: min(480px, calc(100vw - 24px));
  max-height: min(90dvh, calc(100dvh - env(safe-area-inset-top) - env(safe-area-inset-bottom) - 24px));
  padding: 0;
  border: 1px solid var(--ui-border);
  border-radius: var(--radius-panel);
  overflow: hidden;
  color: var(--ui-text);
  box-shadow: var(--shadow-panel);
}
.social-dialog[open] {
  display: flex;
  flex-direction: column;
}
.social-dialog p {
  font-size: var(--text-sm);
  line-height: 1.7;
}
.social-top {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-5) var(--space-6);
  background: var(--paper);
  border-bottom: 1px solid var(--ui-border);
}
.social-top > div {
  min-width: 0;
}
.social-top h2 {
  margin: var(--space-2) 0 0;
  font-size: var(--text-title);
  font-weight: 600;
  letter-spacing: 0;
}
.social-top .eyebrow {
  font-size: var(--text-xs);
  letter-spacing: 0.5px;
  color: var(--ui-muted);
}
.social-top .icon-button {
  width: var(--control-height);
  height: var(--control-height);
  justify-content: center;
  flex-shrink: 0;
  border-radius: var(--radius-control);
}
.social-content {
  min-height: 0;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: 0 var(--space-6) var(--space-5);
}
.social-field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin: var(--space-4) 0;
  font-size: var(--text-sm);
  font-weight: 600;
}
.social-field small {
  float: right;
  font-size: var(--text-xs);
  font-weight: 400;
  color: var(--ui-muted);
}
.social-field input {
  width: 100%;
  box-sizing: border-box;
  min-height: var(--control-height);
  padding: 10px var(--space-3);
  border: 1px solid var(--ui-border-strong);
  border-radius: var(--radius-control);
  color: var(--ui-text);
  background: var(--ui-surface);
  font-family: var(--font-ui);
  font-size: var(--text-body);
  font-weight: 400;
}
.social-field input::placeholder {
  color: var(--ui-muted);
  opacity: 1;
}
.social-field input:focus-visible {
  outline: 2px solid var(--ui-accent);
  outline-offset: 2px;
}
.social-dialog .panel-caption {
  color: var(--ui-muted);
  margin: var(--space-4) 0 var(--space-3);
}
.score-feature {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-5);
  border-radius: var(--radius-card);
  background: var(--ui-soft);
  margin-bottom: var(--space-6);
}
.score-feature span {
  display: block;
  font-size: var(--text-xs);
  color: var(--ui-muted);
}
.score-feature strong {
  display: block;
  font-family: var(--font-numeric);
  font-size: 36px;
  line-height: 1.2;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}
.list-heading {
  display: flex;
  justify-content: space-between;
  color: var(--ui-muted);
  font-size: var(--text-xs);
  padding: 0 var(--space-1) var(--space-2);
  border-bottom: 1px solid var(--ui-border);
}
#ranking-list {
  padding: 0;
  margin: 0;
  list-style: none;
  font-size: var(--text-sm);
}
#ranking-list li {
  display: flex;
  gap: var(--space-3);
  align-items: center;
  padding: var(--space-4) var(--space-1);
  border-bottom: 1px solid var(--ui-border);
  overflow-wrap: anywhere;
}
.rank-number {
  width: var(--space-6);
  flex-shrink: 0;
  font-family: var(--font-numeric);
  font-size: var(--text-sm);
  font-variant-numeric: tabular-nums;
  color: var(--ui-muted);
}
#ranking-list li:first-child .rank-number {
  color: var(--ui-action);
  font-weight: 600;
}
.rank-name {
  flex: 1;
  min-width: 0;
  overflow-wrap: anywhere;
}
.rank-name small {
  display: block;
  margin-top: var(--space-1);
  font-size: var(--text-xs);
  color: var(--ui-muted);
}
#ranking-list strong {
  font-family: var(--font-numeric);
  font-size: var(--text-body);
  font-variant-numeric: tabular-nums;
}
.challenge-metrics {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  padding: var(--space-4) var(--space-1);
  margin: var(--space-3) 0;
  background: var(--ui-soft);
  border-radius: var(--radius-card);
  text-align: center;
}
.challenge-metrics div + div {
  border-left: 1px solid var(--ui-border);
}
.challenge-metrics span {
  display: block;
  font-size: var(--text-xs);
  color: var(--ui-muted);
}
.challenge-metrics strong {
  display: block;
  margin-top: var(--space-1);
  font-family: var(--font-numeric);
  font-size: var(--text-title);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  overflow-wrap: anywhere;
}
.challenge-metrics div:last-child strong {
  color: var(--ui-action);
}
.rewind-controls {
  display: flex;
  gap: var(--space-3);
  align-items: end;
}
.rewind-controls .social-field {
  width: 82px;
  margin: 0;
}
.rewind-presets {
  display: flex;
  flex: 1;
  gap: var(--space-1);
}
.rewind-presets .secondary {
  flex: 1;
  padding-inline: var(--space-1);
}
.snapshot-board {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-1);
  padding: var(--space-2);
  max-width: 220px;
  margin: var(--space-4) auto var(--space-3);
  background: var(--board);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-board);
}
.snapshot-board > div {
  aspect-ratio: 1;
  background: var(--card);
  border-radius: var(--radius-tile);
  display: grid;
  place-items: center;
}
.snapshot-board svg {
  width: 85%;
  height: 85%;
  margin: 0;
}
.social-dialog .preview-note,
.social-dialog .science-note {
  font-size: var(--text-xs);
  text-align: center;
  color: var(--ui-muted);
  margin: var(--space-3) 0;
}
.wide-action {
  display: block;
  width: 100%;
}
.replay-controls .social-field {
  margin: var(--space-3) 0 0;
  color: var(--ui-muted);
}
.replay-controls input[type='range'] {
  accent-color: var(--ui-accent);
  padding: 0;
  border: 0;
  background: transparent;
}
.share-result {
  display: flex;
  align-items: end;
  gap: var(--space-2);
  padding: var(--space-3);
  margin-top: var(--space-3);
  border-radius: var(--radius-card);
  background: var(--ui-soft);
}
.share-result .social-field {
  flex: 1;
  min-width: 0;
  margin: 0;
}
.share-result button {
  white-space: nowrap;
}
#social-status {
  min-height: var(--space-6);
  padding: 10px var(--space-3);
  margin: var(--space-3) 0 0;
  border-radius: var(--radius-control);
  background: var(--ui-soft);
  color: var(--ui-text);
  font-size: var(--text-sm);
  overflow-wrap: anywhere;
}
#social-status:empty {
  display: none;
}
@media (max-width: 600px) {
  .social-actions {
    margin-top: 6px;
    padding-top: var(--space-1);
  }
  .social-actions .secondary {
    padding-block: 6px;
  }
  .social-dialog {
    width: calc(100vw - 16px);
    max-height: min(92dvh, calc(100dvh - env(safe-area-inset-top) - env(safe-area-inset-bottom) - 16px));
    margin: auto;
  }
  .social-top {
    padding: var(--space-3) var(--space-4);
  }
  .social-top h2 {
    font-size: 20px;
  }
  .social-content {
    padding: 0 var(--space-4) var(--space-4);
  }
  .snapshot-board {
    max-width: 200px;
  }
  .social-field small {
    float: none;
    display: block;
    margin-top: var(--space-1);
  }
  .score-feature {
    padding: var(--space-4);
    gap: var(--space-2);
  }
  .rewind-controls,
  .share-result {
    flex-wrap: wrap;
  }
  .rewind-presets {
    min-width: 170px;
  }
  .share-result .social-field {
    flex-basis: 160px;
  }
}
@media (orientation: landscape) and (max-height: 540px) and (max-width: 1100px) {
  .social-top {
    padding: var(--space-2) var(--space-4);
  }
  .social-top h2 {
    font-size: 20px;
    margin-top: var(--space-1);
  }
}
/* The active theme control stays compact while the catalog lives in its dialog. */
.theme-picker {
  width: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
  padding: 10px 14px;
  border: 1px solid var(--ui-border);
  border-radius: var(--radius-card);
  color: var(--ui-text);
  background: var(--ui-surface);
  text-align: left;
}
#current-theme-preview {
  width: 50px;
  height: var(--control-height);
  flex-shrink: 0;
}
#current-theme-preview svg {
  width: 100%;
  height: 100%;
}
.theme-picker small {
  display: block;
  margin-bottom: var(--space-1);
  font-size: var(--text-xs);
  font-weight: 400;
  color: var(--ui-muted);
}
.theme-picker strong {
  font-size: var(--text-md);
  font-weight: 600;
}
.theme-picker-arrow {
  margin-left: auto;
  font-size: var(--text-xs);
  color: var(--ui-action);
  white-space: nowrap;
}
@media (hover: hover) {
  .theme-picker:hover,
  :is(#theme-options, #legacy-options) .world-card:hover {
    border-color: var(--ui-action);
  }
}
.world-picker {
  --dialog-pad: var(--space-6);
  width: min(580px, calc(100vw - 20px));
  max-height: min(90dvh, calc(100dvh - env(safe-area-inset-top) - env(safe-area-inset-bottom) - 24px));
  padding: var(--dialog-pad);
  overflow: auto;
  border-radius: var(--radius-panel);
}
.world-picker-note {
  font-size: var(--text-sm);
  color: var(--ui-muted);
}
#theme-options,
#legacy-options {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
}
#theme-options .world-card,
#legacy-options .world-card {
  width: 100%;
  min-width: 0;
  padding: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  align-items: flex-start;
  border: 1px solid var(--ui-border);
  border-radius: var(--radius-card);
  background: var(--ui-surface);
  color: var(--ui-text);
  box-shadow: var(--shadow-control);
  white-space: normal;
}
:is(#theme-options, #legacy-options) .world-card[aria-pressed='true'] {
  border-color: var(--ui-accent);
  outline: 2px solid var(--ui-accent);
  outline-offset: -2px;
}
:is(#theme-options, #legacy-options) .world-card:focus-visible {
  outline: 3px solid var(--ui-action);
  outline-offset: 3px;
}
.world-card-art {
  display: flex;
  width: 100%;
  height: 62px;
  align-items: center;
  justify-content: center;
}
.world-card-art svg {
  width: 33%;
  height: 60px;
}
.world-card-art .discovery-mask {
  width: calc(33% - 8px);
  height: 50px;
  margin-inline: 4px;
}
.world-card-art .discovery-mask svg {
  width: 22px;
  height: 22px;
}
.world-card strong {
  font-size: var(--text-md);
  font-weight: 600;
}
.world-card small {
  font-size: var(--text-xs);
  font-weight: 400;
  line-height: 1.5;
  color: var(--ui-muted);
  text-align: left;
}
.legacy-worlds {
  margin-top: var(--space-5);
  color: var(--ui-muted);
  font-size: var(--text-sm);
}
.legacy-worlds summary {
  cursor: pointer;
  min-height: var(--control-height);
  padding: var(--space-3) 0;
}
@media (max-width: 600px) {
  .world-picker {
    --dialog-pad: var(--space-4);
  }
  .theme-picker {
    gap: 10px;
    margin-bottom: 10px;
    padding: var(--space-2) var(--space-3);
  }
  #current-theme-preview {
    width: var(--control-height);
    height: 40px;
  }
  .theme-picker small {
    margin-bottom: 3px;
  }
  #theme-options,
  #legacy-options {
    gap: 10px;
  }
  #theme-options .world-card,
  #legacy-options .world-card {
    padding: 10px;
  }
}
@media (max-height: 640px) and (orientation: portrait) and (max-width: 600px) {
  .theme-picker {
    padding-block: 6px;
    margin-bottom: var(--space-2);
  }
}
@media (orientation: landscape) and (max-height: 540px) and (max-width: 1100px) {
  .theme-picker {
    padding: 6px var(--space-3);
    gap: 10px;
  }
  #current-theme-preview {
    width: 40px;
    height: 36px;
  }
  .theme-picker small {
    margin-bottom: 2px;
  }
  .world-picker {
    --dialog-pad: var(--space-4);
    max-height: calc(100dvh - env(safe-area-inset-top) - env(safe-area-inset-bottom) - 16px);
  }
}
body[data-motion='stone'] {
  --merge-motion: stone-settle;
  --card-motion: stone-card;
  --motion-duration: 480ms;
}
/* The bright cyan art palette needs a darker UI action color for white text. */
body[data-theme='berry'] {
  --ui-action: color-mix(in srgb, var(--accent) 35%, var(--ink));
}
body[data-motion='poster'] {
  --merge-motion: poster-stamp;
  --card-motion: poster-card;
  --motion-duration: 400ms;
}
@keyframes stone-settle {
  0% {
    transform: translateY(-7px);
  }
  40% {
    transform: scale(1.07, 0.9);
  }
  70% {
    transform: translateY(-2px);
  }
  100% {
    transform: none;
  }
}
@keyframes stone-card {
  0%,
  100% {
    transform: translateY(-3px);
  }
  30% {
    transform: translateY(1px) scale(1.03, 0.94);
  }
  65% {
    transform: translateY(-4px);
  }
}

/* Constructivist print: flat ink, square stock, registration-offset motion. */
@keyframes poster-stamp {
  0% {
    transform: translate(-3px, 2px);
    opacity: 0.55;
  }
  35% {
    transform: translate(2px, -1px);
    opacity: 1;
  }
  65%,
  100% {
    transform: none;
  }
}
@keyframes poster-card {
  0% {
    transform: translate(-5px, -7px) rotate(-3deg);
    box-shadow: 7px 7px 0 #cb3932;
  }
  35% {
    transform: translate(2px, 1px) rotate(1deg);
    box-shadow: -3px -2px 0 #343332;
  }
  65%,
  100% {
    transform: none;
    box-shadow: none;
  }
}
body[data-theme='construct'] {
  --font-ui: 'Arial Narrow', 'Helvetica Neue', system-ui, sans-serif;
  --font-numeric: var(--font-ui);
  --radius-control: 0;
  --radius-card: 0;
  --radius-panel: 0;
  --radius-board: 0;
  --radius-tile: 0;
  --radius-pill: 0;
  --shadow-control: none;
  --shadow-selection: none;
  --shadow-panel: none;
  --shadow-board: none;
  --shadow-slot: none;
  --shadow-tile: none;
}
body[data-theme='construct'] .ambient {
  background: none;
  border-left: clamp(6px, 2vw, 24px) solid var(--accent);
}
body[data-theme='construct'] h1 {
  font-weight: 950;
  letter-spacing: -2px;
  font-style: normal;
  border-left: 8px solid var(--accent);
  padding-left: 12px;
}
body[data-theme='construct'] :is(.board, .snapshot-board) {
  transform: none;
  outline: 2px solid var(--ink);
  outline-offset: 4px;
}
body[data-theme='construct'] .board:focus-visible {
  outline: 3px solid var(--ui-action);
  outline-offset: 7px;
}
body[data-theme='construct'][data-motion='poster'] :is(.tile-inner, .guide-detail-icon) {
  background: #f4e8d1;
  border: 0;
  transform: none;
  padding: 0;
}
body[data-theme='construct'] .tile .world-sprite {
  width: 88%;
  height: 82%;
  margin: 0;
}
body[data-theme='construct'] .tile-label {
  font-weight: 850;
  color: #343332;
  letter-spacing: 0.3px;
  margin: 0;
  padding: 2px 0 4px;
}
body[data-theme='construct'][data-motion='poster']
  :is(.tile.merge .tile-inner, .motion-demo .guide-detail-icon) {
  animation: poster-card 320ms steps(2, end) both;
  transform-origin: 50% 50%;
}
body[data-theme='construct'] .character-rig {
  animation-timing-function: steps(2, end);
}
body[data-theme='construct'] .score-box {
  border-bottom: 4px solid var(--accent);
  background: var(--ink);
  color: var(--paper);
}
body[data-theme='construct'] .score-box :is(span, strong, small) {
  color: inherit;
}
body[data-theme='construct'] .theme-picker {
  border: 1px solid var(--ink);
  border-left: 8px solid var(--accent);
}
body[data-theme='construct'] .guide-item {
  border: 1px solid var(--ink);
}
body[data-theme='construct'] .guide-item[aria-pressed='true'] {
  outline: 2px solid var(--accent);
}
/* Keep this preview's print identity inside any active world's picker. */
:is(#theme-options, #legacy-options) .world-card[data-theme='construct'] {
  --font-ui: 'Arial Narrow', 'Helvetica Neue', system-ui, sans-serif;
  --radius-card: 0;
  --shadow-control: none;
  --ui-text: #343332;
  --ui-muted: #5a5148;
  --ui-border: #343332;
  --ui-surface: #f4e8d1;
  --ui-accent: #cb3932;
  --ui-action: #cb3932;
  border-width: 2px;
  font-family: var(--font-ui);
}
@media (prefers-reduced-motion: reduce) {
  body[data-theme='construct'][data-motion='poster']
    :is(.tile.merge .tile-inner, .motion-demo .guide-detail-icon, .character-rig) {
    animation: none !important;
  }
}

body[data-theme='construct'] .guide-item .world-sprite {
  margin: 0;
}