:root {
  --app-zoom: 1;
  --paper: #f3eddf;
  --paper-deep: #e8dfcd;
  --cream: #faf6ec;
  --ink: #1b1c19;
  --muted: #797468;
  --line: #b8ae9c;
  --red: #ed5a3b;
  --gold: #d7a935;
  --green: #4b754f;
  --noir: #34352f;
  --on-gold: #1b1c19;
  --tile-border: #9c9485;
  --tile-surface: rgba(250, 246, 236, .46);
  --absent: #555750;
  --absent-deep: #30312d;
  --checking-surface: #fffaf0;
  --backdrop: rgba(27, 28, 25, .72);
  color-scheme: light;
  font-family: "DM Mono", "Courier New", monospace;
  color: var(--ink);
  background: var(--paper);
  font-synthesis: none;
}

:root[data-theme="dark"] {
  --paper: #181916;
  --paper-deep: #24251f;
  --cream: #2d2e27;
  --ink: #f0e9dc;
  --muted: #aaa396;
  --line: #55564d;
  --red: #ff6b4d;
  --gold: #d9ae45;
  --green: #5f8f64;
  --noir: #77786e;
  --tile-border: #626358;
  --tile-surface: rgba(45, 46, 39, .52);
  --absent: #4b4d47;
  --absent-deep: #30322e;
  --checking-surface: #302d24;
  --backdrop: rgba(5, 6, 5, .78);
  color-scheme: dark;
}

* { box-sizing: border-box; }

html {
  min-width: 320px;
  background: var(--paper);
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  background: var(--paper);
  overflow-x: hidden;
  transition: background-color .28s ease, color .28s ease;
}

button {
  color: inherit;
  font: inherit;
}

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

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

.noise {
  position: fixed;
  inset: 0;
  z-index: 20;
  pointer-events: none;
  opacity: .14;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.18'/%3E%3C/svg%3E");
  mix-blend-mode: multiply;
}

:root[data-theme="dark"] .noise {
  opacity: .18;
  mix-blend-mode: soft-light;
}

.theme-toggle {
  width: 62px;
  height: 34px;
  padding: 0;
  position: fixed;
  top: 18px;
  right: 18px;
  z-index: 30;
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
  border: 1.5px solid var(--ink);
  border-radius: 0;
  background: var(--paper-deep);
  box-shadow: 3px 3px 0 var(--red);
  cursor: pointer;
  transition: background .28s ease, border-color .28s ease, box-shadow .18s ease, transform .18s ease;
}

.theme-toggle::before {
  content: "";
  width: 27px;
  height: 27px;
  position: absolute;
  top: 2px;
  left: 2px;
  background: var(--ink);
  transition: transform .28s cubic-bezier(.2, .8, .2, 1), background .28s ease;
}

:root[data-theme="dark"] .theme-toggle::before { transform: translateX(28px); }
.theme-toggle:hover { transform: translate(-1px, -1px); box-shadow: 4px 4px 0 var(--red); }
.theme-toggle:active { transform: translate(2px, 2px); box-shadow: 1px 1px 0 var(--red); }

.theme-icon {
  width: 16px;
  height: 16px;
  position: relative;
  z-index: 1;
  justify-self: center;
  fill: none;
  stroke: var(--ink);
  stroke-width: 1.7;
  stroke-linecap: square;
  stroke-linejoin: miter;
  transition: stroke .28s ease, transform .28s ease;
}

.sun-icon { stroke: var(--paper); }
:root[data-theme="dark"] .sun-icon { stroke: var(--ink); }
:root[data-theme="dark"] .moon-icon { stroke: var(--paper); transform: rotate(-8deg); }

.zoom-control {
  width: 62px;
  height: 31px;
  position: fixed;
  top: 64px;
  right: 18px;
  z-index: 30;
  border: 1.5px solid var(--ink);
  background: var(--paper-deep);
  box-shadow: 3px 3px 0 var(--red);
}

.zoom-control::after {
  content: "";
  width: 6px;
  height: 6px;
  position: absolute;
  top: 9px;
  right: 8px;
  border-right: 1.5px solid var(--ink);
  border-bottom: 1.5px solid var(--ink);
  pointer-events: none;
  transform: rotate(45deg);
}

.zoom-control select {
  width: 100%;
  height: 100%;
  padding: 0 20px 0 8px;
  border: 0;
  border-radius: 0;
  appearance: none;
  background: transparent;
  color: var(--ink);
  font: 500 10px/1 "DM Mono", "Courier New", monospace;
  cursor: pointer;
}

.zoom-control option {
  background: #fff;
  color: #1b1c19;
}

.page-shell {
  width: min(520px, calc(100% - 24px));
  min-height: calc(100dvh / var(--app-zoom));
  margin: 0 auto;
  padding: clamp(28px, 5vh, 52px) 0 28px;
  position: relative;
  z-index: 1;
  zoom: var(--app-zoom);
}

.masthead {
  display: flex;
  justify-content: center;
  margin-bottom: clamp(20px, 3vh, 30px);
}

h1 {
  margin: 0;
  font-family: "Fraunces", Georgia, serif;
  font-size: clamp(46px, 8vw, 66px);
  font-weight: 900;
  line-height: .88;
  letter-spacing: -.065em;
}

.game-column {
  display: grid;
}

.game-settings {
  width: 100%;
  margin: 0 auto 20px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.setting-group {
  min-width: 0;
  display: grid;
  gap: 6px;
  transition: opacity .2s ease;
}

.setting-group.is-unavailable { opacity: .4; }

.setting-label {
  display: flex;
  align-items: center;
  gap: 7px;
  color: var(--muted);
  font-size: 8px;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.setting-label::before {
  content: "";
  width: 18px;
  height: 2px;
  background: var(--red);
}

.mode-toggle {
  width: 100%;
  height: 36px;
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: 1.5px solid var(--ink);
  background: transparent;
  overflow: hidden;
}

.mode-toggle::before {
  content: "";
  width: calc(100% / 3);
  height: 100%;
  position: absolute;
  inset: 0 auto 0 0;
  background: var(--ink);
  transition: transform .24s cubic-bezier(.2, .8, .2, 1), background .24s;
}

.play-mode-toggle { grid-template-columns: repeat(5, 1fr); }
.play-mode-toggle::before { width: 20%; }

.difficulty-toggle[data-mode="hard"]::before {
  background: var(--red);
  transform: translateX(100%);
}

.difficulty-toggle[data-mode="noir"]::before {
  background: var(--noir);
  transform: translateX(200%);
}

.play-mode-toggle[data-mode="67"]::before {
  background: var(--ink);
  transform: translateX(100%);
}

.play-mode-toggle[data-mode="echo"]::before {
  background: var(--gold);
  transform: translateX(200%);
}

.play-mode-toggle[data-mode="duo"]::before {
  background: var(--green);
  transform: translateX(300%);
}

.play-mode-toggle[data-mode="infinite"]::before {
  background: var(--red);
  transform: translateX(400%);
}

.mode-toggle button {
  height: 100%;
  padding: 0;
  position: relative;
  z-index: 1;
  border: 0;
  background: transparent;
  font-size: 10px;
  font-weight: 500;
  letter-spacing: .035em;
  cursor: pointer;
  transition: color .2s;
}

.mode-toggle button[aria-pressed="true"] { color: var(--paper); }
.play-mode-toggle[data-mode="echo"] button[aria-pressed="true"] { color: var(--on-gold); }
.mode-toggle button:disabled { cursor: not-allowed; }
.mode-toggle button:focus-visible { outline-offset: -3px; }

.board {
  width: min(100%, 380px);
  margin: 0 auto 24px;
  display: grid;
  gap: 7px;
}

.board-panel {
  min-width: 0;
  display: grid;
  gap: 7px;
}

.board-panel-label {
  display: none;
  align-items: center;
  justify-content: space-between;
  color: var(--muted);
  font-size: 8px;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.board-panel-label::after {
  content: "";
  width: 24px;
  height: 2px;
  background: var(--red);
}

.board[data-play-mode="duo"] {
  width: min(100%, 520px);
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.board[data-play-mode="67"] { width: min(100%, 450px); }
.board[data-play-mode="67"] .board-row { grid-template-columns: repeat(6, minmax(0, 1fr)); }

.board[data-play-mode="duo"] .board-panel { gap: 5px; }
.board[data-play-mode="duo"] .board-panel-label { display: flex; }
.board[data-play-mode="duo"] .board-row { gap: 4px; }
.board[data-play-mode="duo"] .tile { font-size: clamp(20px, 4vw, 34px); }
.board-panel.is-solved .board-panel-label { color: var(--green); }
.board-panel.is-solved .board-panel-label::after { background: var(--green); }

.board-row {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 7px;
}

.tile {
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  border: 1.5px solid var(--tile-border);
  background: var(--tile-surface);
  font-family: "Fraunces", Georgia, serif;
  font-size: clamp(28px, 4.6vw, 43px);
  font-weight: 900;
  line-height: 1;
  text-transform: uppercase;
  user-select: none;
  transform-style: preserve-3d;
}

.tile.filled {
  border-color: var(--ink);
  background: var(--cream);
  animation: pop .12s ease-out;
}

.board-row.checking .tile.filled { animation: checking-tile .75s ease-in-out infinite alternate; }
.tile.correct, .tile.present, .tile.absent { color: white; border-color: var(--ink); }
.tile.correct { background: var(--green); }
.tile.present { color: var(--on-gold); background: var(--gold); }
.tile.absent { background: var(--absent); }
.tile.reveal { animation: reveal .55s ease both; }
.board[data-play-mode="echo"] .board-row.echo-faded .tile.correct,
.board[data-play-mode="echo"] .board-row.echo-faded .tile.present,
.board[data-play-mode="echo"] .board-row.echo-faded .tile.absent {
  border-color: var(--tile-border);
  background: var(--tile-surface);
  color: var(--ink);
  transition: color .55s ease, border-color .55s ease, background .55s ease;
}

.infinite-hud {
  width: min(100%, 380px);
  min-height: 44px;
  margin: -5px auto 16px;
  padding: 6px 14px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  border: 1.5px solid var(--ink);
  background: var(--paper-deep);
  box-shadow: 4px 4px 0 var(--red);
}

.infinite-hud[hidden] { display: none; }

.infinite-hud > div {
  display: grid;
  gap: 2px;
  text-align: center;
}

.infinite-hud span {
  color: var(--muted);
  font-size: 7px;
  letter-spacing: .14em;
  text-transform: uppercase;
}

.infinite-hud strong {
  font-family: "Fraunces", Georgia, serif;
  font-size: 20px;
  line-height: 1;
}

.infinite-hud > i {
  padding: 0 15px;
  color: var(--red);
  font-family: "Fraunces", Georgia, serif;
  font-size: 26px;
  font-style: normal;
  line-height: 1;
}

.infinite-hud.is-urgent {
  color: var(--red);
  animation: urgent-pulse .72s ease-in-out infinite alternate;
}
.tile.noir-violation {
  z-index: 1;
  border-color: var(--red);
  box-shadow: inset 0 0 0 1.5px var(--red), 3px 3px 0 rgba(237, 90, 59, .28);
  color: var(--red);
  animation: noir-tile-alert .56s ease-in-out;
}
.board-row.shake { animation: shake .36s ease-in-out; }
.board-row.win .tile { animation: bounce .58s ease both; }

.keyboard {
  width: 100%;
  margin: 0 auto;
  display: grid;
  gap: 7px;
}

.key-row {
  display: flex;
  justify-content: center;
  gap: 5px;
}

.key {
  height: 46px;
  min-width: 0;
  max-width: 44px;
  padding: 0 3px;
  flex: 1 1 0;
  border: 1px solid var(--tile-border);
  border-radius: 0;
  background: var(--paper-deep);
  box-shadow: 0 2px 0 var(--tile-border);
  font-size: 12px;
  font-weight: 500;
  cursor: pointer;
  transition: transform .08s, background .2s, color .2s;
}

.key:hover { background: var(--cream); }
.key:active { box-shadow: none; transform: translateY(2px); }
.key:disabled { cursor: wait; opacity: .72; }
.key.wide { max-width: 72px; flex-grow: 1.65; font-size: 8px; }
.key.correct { color: white; border-color: var(--green); background: var(--green); box-shadow: 0 2px 0 #304d33; }
.key.present { color: var(--on-gold); border-color: var(--gold); background: var(--gold); box-shadow: 0 2px 0 #9c7826; }
.key.absent { color: white; border-color: var(--absent); background: var(--absent); box-shadow: 0 2px 0 var(--absent-deep); }
.key.duo-status {
  --duo-0: var(--paper-deep);
  --duo-1: var(--paper-deep);
  border-color: var(--ink);
  background: linear-gradient(90deg, var(--duo-0) 0 50%, var(--duo-1) 50% 100%);
  color: white;
  text-shadow: 0 1px 1px var(--ink);
}
.key.noir-violation {
  outline: 2px solid var(--red);
  outline-offset: 2px;
  animation: noir-key-alert .56s ease-in-out;
}

.round-action-button {
  width: 104px;
  height: 34px;
  padding: 0 10px 0 30px;
  position: fixed;
  top: 18px;
  left: 18px;
  z-index: 30;
  border: 1.5px solid var(--ink);
  border-radius: 0;
  background: var(--paper-deep);
  box-shadow: 3px 3px 0 var(--red);
  color: var(--ink);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: .1em;
  cursor: pointer;
  transition: width .18s ease, background .18s ease, box-shadow .18s ease, transform .18s ease;
}

.round-action-button::before {
  content: "";
  width: 11px;
  height: 15px;
  position: absolute;
  top: 7px;
  left: 10px;
  border: 1.5px solid currentColor;
  background: repeating-linear-gradient(-45deg, transparent 0 3px, var(--red) 3px 5px);
  transform: rotate(-8deg) skewY(-5deg);
}

.round-action-button.is-restart::before {
  content: "↻";
  width: auto;
  height: auto;
  top: 50%;
  border: 0;
  background: none;
  font-size: 18px;
  line-height: 1;
  transform: translateY(-54%);
}

.round-action-button.is-restart {
  width: 122px;
  white-space: nowrap;
}

.round-action-button:hover:not(:disabled) {
  background: var(--cream);
  color: var(--red);
  box-shadow: 4px 4px 0 var(--red);
  transform: translate(-1px, -1px);
}

.round-action-button:active:not(:disabled) {
  box-shadow: 1px 1px 0 var(--red);
  transform: translate(2px, 2px);
}

.round-action-button:disabled {
  opacity: .38;
  cursor: not-allowed;
}

.toast {
  max-width: calc(100% - 32px);
  padding: 12px 18px;
  position: fixed;
  top: 22px;
  left: 50%;
  z-index: 100;
  border: 1px solid var(--paper);
  background: var(--ink);
  box-shadow: 5px 5px 0 var(--red);
  color: var(--paper);
  font-size: 11px;
  letter-spacing: .05em;
  transform: translate(-50%, -120px);
  transition: transform .28s cubic-bezier(.2, .8, .2, 1);
}

.toast.show { transform: translate(-50%, 0); }

.target-loading-screen {
  position: fixed;
  inset: 0;
  z-index: 60;
  display: grid;
  place-items: center;
  padding: 24px;
  background: var(--backdrop);
  backdrop-filter: blur(3px);
}

.target-loading-screen[hidden] { display: none; }

.target-loading-card {
  min-width: min(100%, 260px);
  padding: 24px 28px;
  display: grid;
  justify-items: center;
  gap: 14px;
  border: 2px solid var(--ink);
  background: var(--paper);
  box-shadow: 8px 8px 0 var(--red);
}

.target-loading-card p {
  margin: 0;
  font-size: 11px;
  font-weight: 500;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.pixel-mascot {
  width: 132px;
  height: 118px;
  position: relative;
  animation: pixel-mascot-bob 1.25s steps(2, end) infinite;
}

.pixel-body {
  width: 110px;
  height: 96px;
  position: absolute;
  bottom: 0;
  left: 11px;
  background: var(--ink);
  clip-path: polygon(27% 0, 73% 0, 91% 12%, 100% 32%, 100% 68%, 91% 88%, 73% 100%, 27% 100%, 9% 88%, 0 68%, 0 32%, 9% 12%);
}

.pixel-body::before {
  content: "";
  position: absolute;
  inset: 7px;
  background: var(--green);
  clip-path: polygon(27% 0, 73% 0, 91% 12%, 100% 32%, 100% 68%, 91% 88%, 73% 100%, 27% 100%, 9% 88%, 0 68%, 0 32%, 9% 12%);
}

.pixel-hole {
  width: 48px;
  height: 48px;
  position: absolute;
  z-index: 1;
  top: 27px;
  left: 31px;
  background: var(--ink);
  clip-path: polygon(20% 0, 80% 0, 100% 20%, 100% 80%, 80% 100%, 20% 100%, 0 80%, 0 20%);
}

.pixel-hole::after {
  content: "";
  position: absolute;
  inset: 6px;
  background: var(--paper);
}

.pixel-eye {
  width: 42px;
  height: 34px;
  position: absolute;
  z-index: 2;
  top: 0;
  border: 4px solid var(--ink);
  background: #f4f0df;
  box-shadow: inset 0 -4px 0 rgba(27, 28, 25, .12);
}

.pixel-eye-left { left: 24px; }
.pixel-eye-right { right: 24px; }

.pixel-eye::after {
  content: "";
  width: 18px;
  height: 18px;
  position: absolute;
  z-index: 1;
  top: 5px;
  left: 3px;
  background: #1b1c19;
  clip-path: polygon(25% 0, 100% 0, 100% 75%, 75% 100%, 0 100%, 0 25%);
  animation: pixel-look 4s steps(1, end) infinite;
}

.pixel-mouth {
  width: 28px;
  height: 10px;
  position: absolute;
  z-index: 2;
  top: 45px;
  left: 52px;
  border-bottom: 4px solid var(--ink);
  border-left: 4px solid var(--ink);
  border-right: 4px solid var(--ink);
}

.paper-dialog {
  width: min(520px, calc(100% - 32px));
  max-height: calc(100vh - 32px);
  padding: 34px;
  overflow-y: auto;
  border: 2px solid var(--ink);
  border-radius: 0;
  background: var(--paper);
  box-shadow: 10px 10px 0 var(--red);
  color: var(--ink);
}

.paper-dialog::backdrop {
  background: var(--backdrop);
  backdrop-filter: blur(3px);
}

.paper-dialog .close-button {
  width: 34px;
  height: 34px;
  padding: 0;
  position: absolute;
  top: 14px;
  right: 14px;
  border: 0;
  background: transparent;
  font-size: 28px;
  cursor: pointer;
}

.dialog-kicker {
  color: var(--red);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: .16em;
}

.paper-dialog h2 {
  margin: 14px 0 16px;
  font-family: "Fraunces", Georgia, serif;
  font-size: clamp(32px, 7vw, 46px);
  line-height: .89;
  letter-spacing: -.045em;
}

.paper-dialog > p {
  font-family: Georgia, serif;
  line-height: 1.5;
}

.primary-button {
  min-height: 49px;
  padding: 0 18px;
  border: 1.5px solid var(--ink);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: .08em;
  cursor: pointer;
}

.primary-button { color: var(--paper); background: var(--ink); box-shadow: 4px 4px 0 var(--red); }
.primary-button:hover { background: var(--red); }

.result-actions {
  margin-top: 26px;
}

.result-actions .primary-button { width: 100%; }

.result-dialog.requires-restart .close-button { display: none; }

.result-dialog.is-loss #result-title {
  width: fit-content;
  margin: 18px 0 14px;
  padding: 0 2px 7px;
  color: var(--red);
  border-bottom: 5px solid var(--ink);
  font-size: clamp(56px, 12vw, 76px);
  line-height: .82;
  letter-spacing: .035em;
  text-shadow: 3px 3px 0 var(--paper-deep);
  animation: solution-stamp .45s cubic-bezier(.18, .88, .28, 1.28) both;
}

.result-dialog.is-loss #result-copy { margin-top: 0; }

.sixty-seven-hands {
  height: 164px;
  margin: 20px 0 4px;
  position: relative;
  overflow: hidden;
  border-top: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
  background: var(--paper-deep);
}

.sixty-seven-caption {
  position: absolute;
  z-index: 2;
  top: 10px;
  left: 50%;
  color: var(--red);
  font-size: 9px;
  font-weight: 500;
  letter-spacing: .17em;
  transform: translateX(-50%);
}

.sixty-seven-hand {
  width: 120px;
  height: 102px;
  position: absolute;
  bottom: 8px;
  background-repeat: no-repeat;
  background-position: center;
  background-size: contain;
  image-rendering: pixelated;
  animation: sixty-seven-bob .7s steps(2, end) infinite alternate;
}

.hand-left { left: 13%; background-image: url("./assets/sixty-seven-hand-left.png"); }
.hand-right {
  right: 13%;
  background-image: url("./assets/sixty-seven-hand-right.png");
  animation-direction: alternate-reverse;
}

@keyframes sixty-seven-bob { to { translate: 0 -18px; } }

.infinite-result-summary {
  margin-top: 24px;
  padding-top: 17px;
  border-top: 2px solid var(--ink);
}

.infinite-result-summary h3 {
  display: flex;
  justify-content: space-between;
  margin: 0 0 13px;
  color: var(--red);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: .16em;
  text-transform: uppercase;
}

.infinite-result-summary ul {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.infinite-result-summary li {
  padding: 7px 9px 5px;
  border: 1.5px solid var(--ink);
  background: var(--paper-deep);
  box-shadow: 2px 2px 0 var(--ink);
  font-family: "Fraunces", Georgia, serif;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .06em;
}

.infinite-result-summary li:nth-child(even) { transform: rotate(1deg); }
.infinite-result-summary li:nth-child(3n) { transform: rotate(-1deg); }

.infinite-result-summary li.is-empty {
  padding: 0;
  border: 0;
  background: transparent;
  box-shadow: none;
  color: var(--muted);
  font-family: Georgia, serif;
  font-size: 14px;
  font-weight: 400;
  letter-spacing: 0;
  transform: none;
}

@keyframes pop { 50% { transform: scale(1.08); } }
@keyframes reveal { 0% { transform: rotateX(0); } 48% { transform: rotateX(90deg); } 100% { transform: rotateX(0); } }
@keyframes bounce { 0%, 100% { transform: translateY(0); } 45% { transform: translateY(-12px); } }
@keyframes shake { 20%, 60% { transform: translateX(-6px); } 40%, 80% { transform: translateX(6px); } }
@keyframes noir-tile-alert {
  15%, 45% { transform: translateX(-5px) rotate(-1deg); }
  30%, 60% { transform: translateX(5px) rotate(1deg); }
  75% { transform: translateX(0); }
}
@keyframes noir-key-alert {
  35% { transform: translateY(-3px) scale(1.06); }
  70% { transform: translateY(1px) scale(.98); }
}
@keyframes checking-tile { to { border-color: var(--red); background: var(--checking-surface); } }
@keyframes pixel-mascot-bob { 50% { transform: translateY(-5px); } }
@keyframes pixel-look {
  0%, 49.999% { transform: translateX(0); }
  50%, 100% { transform: translateX(18px); }
}
@keyframes solution-stamp { from { opacity: 0; transform: scale(1.12) rotate(-2deg); } }
@keyframes urgent-pulse { to { box-shadow: 6px 6px 0 var(--red); transform: translateY(-1px); } }

@media (max-width: 600px) {
  .round-action-button { top: 12px; left: 12px; }
  .theme-toggle { top: 12px; right: 12px; }
  .zoom-control { top: 58px; right: 12px; }
  .page-shell { width: min(100% - 16px, 520px); padding-top: 22px; }
  .masthead { margin-bottom: 18px; }
  h1 { font-size: clamp(44px, 14vw, 58px); }
  .game-settings { margin-bottom: 16px; gap: 8px; }
  .mode-toggle { height: 34px; }
  .board { width: min(100%, 350px); margin-bottom: 18px; gap: 6px; }
  .board[data-play-mode="67"] { width: min(100%, 350px); }
  .board-row { gap: 6px; }
  .tile { font-size: clamp(27px, 9vw, 38px); }
  .keyboard { gap: 6px; }
  .key-row { gap: 4px; }
  .key { height: 44px; padding: 0 2px; font-size: 11px; }
  .key.wide { font-size: 7px; }
  .paper-dialog { padding: 27px 20px 24px; }
  .paper-dialog h2 { font-size: 38px; }
}

@media (max-height: 760px) {
  .page-shell { padding-top: 18px; }
  .masthead { margin-bottom: 14px; }
  h1 { font-size: 44px; }
  .game-settings { margin-bottom: 13px; }
  .setting-group { gap: 4px; }
  .mode-toggle { height: 32px; }
  .board { width: min(100%, 320px); margin-bottom: 14px; gap: 5px; }
  .board[data-play-mode="67"] { width: min(100%, 320px); }
  .board-row { gap: 5px; }
  .key { height: 40px; }
  .keyboard { gap: 5px; }
}

@media (max-width: 420px) {
  .page-shell { padding-top: 64px; }
  .game-settings { width: min(100%, 270px); grid-template-columns: 1fr; }
  .mode-toggle { height: 31px; }
  .board[data-play-mode="duo"] { gap: 7px; }
  .board[data-play-mode="duo"] .board-panel { gap: 4px; }
  .board[data-play-mode="duo"] .board-row { gap: 2px; }
  .board[data-play-mode="duo"] .tile { font-size: clamp(17px, 6vw, 24px); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: .01ms !important;
  }
}