:root {
  color-scheme: dark;
  --bg: #102b32;
  --panel: #16353c;
  --ink: #f1eee3;
  --muted: #a4b8b8;
  --faint: #769393;
  --line: #2c4b50;
  --accent: #ed9d82;
  --mint: #b9e1b7;
  --danger: #f3ad99;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
* {
  box-sizing: border-box;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.5;
}
button,
a,
summary {
  -webkit-tap-highlight-color: transparent;
}
button {
  font: inherit;
  color: inherit;
  cursor: pointer;
}
button:disabled {
  cursor: default;
}
button:focus-visible,
a:focus-visible,
summary:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 5px;
}
button {
  touch-action: manipulation;
}
button[hidden],
[hidden] {
  display: none !important;
}
.page {
  width: min(1180px, calc(100% - 80px));
  margin: auto;
}
.masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 31px 0 26px;
  border-bottom: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 1.6px;
  color: var(--muted);
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: inherit;
  text-decoration: none;
}
.brand:hover {
  color: var(--ink);
}
.brand-mark {
  font-size: 23px;
  line-height: 1;
  color: var(--accent);
}
.slash {
  color: var(--faint);
  margin: 0 4px;
}
.local-badge {
  font-size: 9px;
  letter-spacing: 1.1px;
  padding: 5px 8px;
  border: 1px solid var(--line);
  border-radius: 3px;
  color: var(--faint);
}
.intro {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 30px;
  padding: 39px 0 31px;
}
.eyebrow {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 1.8px;
  color: var(--accent);
  margin: 0 0 12px;
}
h1 {
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(38px, 4.7vw, 61px);
  font-weight: normal;
  line-height: 1.1;
  letter-spacing: -2.2px;
  margin: 0;
}
h1 em {
  font-weight: normal;
  color: var(--accent);
}
.intro-copy {
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
  margin: 0 0 4px;
}
.board-picker {
  display: flex;
  gap: 8px;
  margin-bottom: 22px;
}
.board-option {
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 10px 17px;
  font-size: 12px;
  display: flex;
  gap: 12px;
  align-items: center;
  transition:
    background 0.15s,
    border-color 0.15s;
}
.board-option .board-num {
  font-family: var(--mono);
  font-size: 10px;
  color: var(--faint);
}
.board-option:hover {
  background: #1a3b42;
}
.board-option[aria-pressed="true"] {
  background: #e8e6d9;
  color: #19363c;
  border-color: #e8e6d9;
}
.board-option[aria-pressed="true"] .board-num {
  color: #637a78;
}
.playground {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  border: 1px solid var(--line);
  border-radius: 11px;
  overflow: hidden;
}
.play-area {
  padding: 21px 28px 20px;
  background: radial-gradient(ellipse at 50% 40%, #1a3b41 0%, #143138 75%);
}
.board-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
}
.board-toolbar > div:first-child {
  display: flex;
  align-items: center;
  gap: 14px;
}
.small-label {
  font: 9px var(--mono);
  letter-spacing: 1.3px;
  color: var(--muted);
}
.progress {
  font: 10px var(--mono);
  color: var(--faint);
}
.board-actions {
  display: flex;
  gap: 14px;
}
.quiet-button {
  background: none;
  border: 0;
  padding: 4px 0;
  font-size: 11px;
  color: var(--muted);
}
.quiet-button:hover {
  color: var(--ink);
}
.quiet-button:disabled {
  opacity: 0.3;
}
.quiet-button span {
  font-size: 15px;
}
.board-stage {
  min-height: 350px;
  height: 380px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: 26px 16px 17px;
}
.board {
  display: grid;
  gap: 0;
  position: relative;
  filter: drop-shadow(0 12px 16px #00151d44);
  width: min(100%, var(--board-width, 350px));
  aspect-ratio: var(--board-ratio, 1);
  flex-shrink: 0;
  border: 1px solid #486266;
  background: #0f282e;
  border-radius: 5px;
  overflow: hidden;
  isolation: isolate;
}
.cell {
  margin: 0;
  padding: 0;
  min-width: 0;
  position: relative;
  background: #213e44;
  border: 0;
  border-right: 1px solid #3b55594d;
  border-bottom: 1px solid #3b55594d;
  transition: background-color 0.12s;
  aspect-ratio: 1;
  z-index: 0;
}
.cell::after {
  content: "";
  position: absolute;
  width: 3px;
  height: 3px;
  left: calc(50% - 1.5px);
  top: calc(50% - 1.5px);
  border-radius: 50%;
  background: #718b8655;
  pointer-events: none;
}
.cell.inactive {
  background: #102b32;
  border-color: #102b32;
  pointer-events: none;
}
.cell.inactive::after {
  display: none;
}
.cell.filled {
  background: var(--piece-color);
  border-color: #102b3215;
}
.cell.filled::after {
  display: none;
}
.cell.filled:hover {
  filter: brightness(1.06);
}
.cell.preview {
  background: color-mix(in srgb, var(--piece-color) 64%, #213e44);
  border-color: #102b3222;
}
.cell.preview::after {
  background: #102b3255;
}
.cell.preview.dead {
  background: repeating-linear-gradient(
    135deg,
    #b67565 0px,
    #b67565 7px,
    #be8272 7px,
    #be8272 9px
  );
}
.cell.preview.invalid {
  background: #8b655c;
}
.cell.peek {
  background: color-mix(in srgb, var(--piece-color) 33%, #213e44);
}
.cell.peek::after {
  background: #d7e6dc55;
}
.cell.forced {
  box-shadow: inset 0 0 0 2px var(--mint);
  z-index: 1;
}
.cell.anchor::before {
  content: "+";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font: 20px var(--mono);
  color: #0d2b32aa;
  z-index: 2;
}
.cell[data-top="true"] {
  border-top: 2px solid #102b3280;
}
.cell[data-right="true"] {
  border-right: 2px solid #102b3280;
}
.cell[data-bottom="true"] {
  border-bottom: 2px solid #102b3280;
}
.cell[data-left="true"] {
  border-left: 2px solid #102b3280;
}
.cell:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: -5px;
  z-index: 3;
}
.cell.active-cursor {
  box-shadow: inset 0 0 0 2px #f4f0da90;
  z-index: 1;
}
.board-help {
  text-align: center;
  font-size: 11px;
  color: var(--muted);
  margin: 6px 0 25px;
  min-height: 17px;
}
.board-help kbd {
  font-size: 10px;
  border: 0;
  padding: 0;
  color: var(--ink);
}
.trail-section {
  border-top: 1px solid var(--line);
  padding-top: 15px;
  min-height: 69px;
}
.trail {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 10px;
}
.trail-step {
  font: 10px var(--mono);
  color: var(--muted);
  padding: 4px 7px;
  border: 1px solid transparent;
  border-radius: 3px;
  background: transparent;
}
.trail-step:hover {
  background: #21434a;
}
.trail-step:last-child {
  color: var(--ink);
  background: #28484e;
}
.trail-step.dead {
  color: var(--danger);
}
.trail-step span {
  display: inline-block;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  margin-right: 5px;
  background: var(--step-color, var(--muted));
}
.trail-arrow {
  font-size: 10px;
  color: var(--faint);
}
.workbench {
  padding: 23px 23px 20px;
  border-left: 1px solid var(--line);
  background: #102b32;
}
.count-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}
.exact-badge {
  font: 7px var(--mono);
  letter-spacing: 1px;
  border: 1px solid #3d6157;
  color: #9fbdab;
  padding: 3px 5px;
  border-radius: 3px;
}
.count {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 64px;
  line-height: 1.05;
  font-variant-numeric: tabular-nums;
  letter-spacing: -2px;
  margin: 13px 0 6px;
}
.count.long {
  font-size: 49px;
}
.possibility-panel.dead .count {
  color: var(--danger);
}
.possibility-panel.solved .count {
  color: var(--mint);
}
#count-description {
  font-size: 11px;
  color: var(--muted);
  margin: 0;
  min-height: 18px;
}
.preview-line {
  font: 10px var(--mono);
  line-height: 1.6;
  color: var(--mint);
  padding: 12px 0 16px;
  margin: 11px 0 18px;
  border-bottom: 1px solid var(--line);
  min-height: 45px;
}
.preview-line.warning {
  color: var(--danger);
}
.pieces-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 12px;
}
#selection-label {
  font: 9px var(--mono);
  color: var(--accent);
}
.pieces {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 7px;
}
.piece-card {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 7px;
  background: #19373e;
  border: 1px solid #365158;
  border-radius: 5px;
  padding: 10px 5px 7px;
  min-height: 84px;
  transition:
    background 0.15s,
    transform 0.15s,
    border-color 0.15s;
}
.piece-card:hover:not(:disabled) {
  background: #25464c;
  transform: translateY(-1px);
}
.piece-card[aria-pressed="true"] {
  border-color: var(--piece-color);
  background: color-mix(in srgb, var(--piece-color) 12%, #102b32);
  box-shadow: 0 0 0 1px var(--piece-color);
}
.piece-card.placed {
  opacity: 0.3;
  cursor: default;
  background: #102b32;
  border-style: dashed;
}
.piece-card.placed .piece-number {
  color: var(--mint);
}
.piece-card svg {
  height: 37px;
  max-width: 58px;
  overflow: visible;
  display: block;
}
.piece-number {
  font: 9px var(--mono);
  letter-spacing: 0.4px;
  color: var(--muted);
}
.piece-card[aria-pressed="true"] .piece-number {
  color: var(--piece-color);
}
.piece-controls {
  display: flex;
  gap: 7px;
  margin-top: 11px;
}
.piece-controls button {
  display: flex;
  gap: 7px;
  justify-content: center;
  align-items: center;
  flex: 1;
  font-size: 11px;
  padding: 9px 4px;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 4px;
}
.piece-controls button:hover:enabled {
  background: #1c3d43;
}
.piece-controls button:disabled {
  opacity: 0.35;
}
.piece-controls button span {
  font-size: 16px;
  line-height: 1;
}
kbd {
  font: 8px var(--mono);
  border: 1px solid var(--line);
  padding: 1px 3px;
  border-radius: 2px;
  color: var(--faint);
}
.place-button {
  width: 100%;
  margin-top: 9px;
  padding: 10px 8px;
  border-radius: 4px;
  border: 1px solid #9cc6ac;
  background: var(--mint);
  color: #133638;
  font-size: 11px;
  font-weight: 600;
}
.place-button:disabled {
  background: transparent;
  border-color: var(--line);
  color: var(--faint);
  font-weight: 400;
}
.place-button.dead:enabled {
  background: #e2a693;
  border-color: #e2a693;
}
.help-actions {
  display: flex;
  justify-content: space-between;
  gap: 7px;
  margin-top: 18px;
}
.help-actions button {
  font-size: 11px;
  color: var(--muted);
  padding: 0;
  background: none;
  border: 0;
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-color: #426165;
}
.help-actions button:hover {
  color: var(--ink);
}
.help-actions button:disabled {
  opacity: 0.3;
}
.help-actions button.active {
  color: var(--mint);
}
.message {
  font-size: 11px;
  line-height: 1.65;
  color: var(--faint);
  min-height: 36px;
  margin: 15px 0 0;
}
.message.important {
  color: var(--muted);
}
.solved-stamp {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 238px;
  text-align: center;
  padding: 22px;
  background: #102b32ee;
  backdrop-filter: blur(10px);
  border: 1px solid #9ac59c;
  border-radius: 8px;
  box-shadow: 0 8px 45px #0b252977;
  z-index: 5;
}
.solved-stamp > span {
  display: block;
  font: 8px var(--mono);
  letter-spacing: 1.5px;
  color: var(--mint);
}
.solved-stamp strong {
  display: block;
  font:
    29px Georgia,
    serif;
  margin: 8px 0 16px;
  font-weight: normal;
}
.solved-stamp button {
  font-size: 11px;
  border: 0;
  background: none;
  padding: 0;
  color: var(--muted);
}
.underneath {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  margin: 27px 0 39px;
  align-items: start;
}
.invitation {
  display: flex;
  align-items: start;
  gap: 15px;
}
.spark {
  font-size: 27px;
  color: var(--accent);
  line-height: 1.2;
}
.invitation p {
  font-size: 12px;
  margin: 0;
  color: var(--muted);
  line-height: 1.9;
}
.invitation p span {
  color: var(--faint);
}
details {
  font-size: 12px;
  color: var(--muted);
}
summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  border-bottom: 1px solid var(--line);
  padding: 5px 0 11px;
}
summary::-webkit-details-marker {
  display: none;
}
summary:hover {
  color: var(--ink);
}
details[open] summary span {
  transform: rotate(45deg);
}
.explanation-content {
  font-size: 12px;
  line-height: 1.8;
}
.explanation-content a {
  color: var(--accent);
  text-underline-offset: 3px;
}
.fine-print {
  color: var(--faint);
  font-size: 11px;
}
.engine-stats {
  display: flex;
  gap: 20px;
  margin: 18px 0;
}
.engine-stat strong {
  display: block;
  font: 18px var(--mono);
  color: var(--ink);
  margin-bottom: 4px;
}
.engine-stat span {
  font: 8px var(--mono);
  color: var(--faint);
  letter-spacing: 0.7px;
}
footer {
  display: flex;
  justify-content: space-between;
  gap: 15px;
  padding: 20px 0 28px;
  border-top: 1px solid var(--line);
  font: 9px var(--mono);
  color: var(--faint);
}
.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
}
.footer-links a {
  color: var(--muted);
  text-underline-offset: 3px;
}
.footer-links a:hover {
  color: var(--ink);
}
.noscript {
  padding: 20px;
  background: #7e4030;
  color: white;
}
.loading {
  opacity: 0.5;
  pointer-events: none;
}
.board-row {
  display: contents;
}
.piece-card:not(:disabled),
.cell.filled {
  cursor: grab;
  touch-action: none;
}
.board,
.pieces {
  -webkit-user-select: none;
  user-select: none;
}
.piece-card.lifting .piece-art {
  opacity: 0.25;
}
.dragging,
.dragging * {
  cursor: grabbing !important;
}
.drag-ghost {
  position: fixed;
  z-index: 100;
  pointer-events: none;
  filter: drop-shadow(0 14px 11px #00171ba6);
  opacity: 0.94;
  will-change: left, top;
}
.drag-ghost svg {
  width: 100%;
  height: 100%;
  display: block;
  overflow: visible;
}
.drag-ghost.over-board {
  opacity: 0.68;
}
.drag-ghost.invalid {
  opacity: 0.42;
  filter: drop-shadow(0 10px 10px #00171b88);
}
.dragging .cell {
  transition: none;
}
.dragging .cell.preview:not(.invalid) {
  box-shadow: inset 0 0 0 1px #f1eee34d;
}
.solved-stamp {
  pointer-events: none;
}
.solved-stamp button {
  pointer-events: auto;
}
@media (min-width: 1400px) {
  .page {
    width: min(1180px, calc(100% - 120px));
  }
  .intro {
    padding: 44px 0 36px;
  }
  .playground {
    grid-template-columns: minmax(0, 1fr) 340px;
  }
  .board-stage {
    height: 415px;
  }
  .workbench {
    padding: 25px 27px;
  }
  .piece-card {
    min-height: 90px;
  }
  .count {
    font-size: 70px;
  }
}
@media (max-width: 1000px) {
  .page {
    width: calc(100% - 44px);
  }
  .intro {
    padding-top: 30px;
  }
  .intro-copy {
    font-size: 12px;
  }
  .playground {
    grid-template-columns: minmax(0, 1fr) 290px;
  }
  .play-area {
    padding: 19px 18px;
  }
  .workbench {
    padding: 20px 18px;
  }
  .board-stage {
    padding: 20px 0;
    min-height: 310px;
    height: 350px;
  }
  .board-toolbar > div:first-child {
    gap: 9px;
  }
  .small-label {
    font-size: 8px;
  }
  .underneath {
    gap: 25px;
  }
  .count {
    font-size: 58px;
  }
}
@media (max-width: 740px) {
  .page {
    width: calc(100% - 32px);
  }
  .masthead {
    padding: 20px 0 18px;
    font-size: 9px;
  }
  .brand {
    gap: 6px;
  }
  .local-badge {
    font-size: 7px;
    letter-spacing: 0.5px;
  }
  .intro {
    padding: 27px 0 23px;
    display: block;
  }
  .intro-copy {
    font-size: 12px;
    line-height: 1.5;
    margin: 13px 0 0;
  }
  .intro-copy br {
    display: none;
  }
  h1 {
    font-size: 42px;
    letter-spacing: -1.6px;
  }
  .eyebrow {
    font-size: 8px;
    margin-bottom: 10px;
  }
  .board-picker {
    gap: 6px;
    margin-bottom: 16px;
  }
  .board-option {
    font-size: 10px;
    padding: 10px;
    flex: 1;
    gap: 7px;
    justify-content: center;
  }
  .board-option .board-num {
    font-size: 8px;
  }
  .playground {
    display: flex;
    flex-direction: column;
  }
  .play-area {
    padding: 15px 16px;
  }
  .board-stage {
    height: auto;
    min-height: 0;
    padding: 23px 9px 16px;
  }
  .board {
    max-width: 350px;
  }
  .board-help {
    font-size: 10px;
    margin: 3px 0 17px;
    line-height: 1.5;
  }
  .trail-section {
    min-height: 0;
    padding-top: 12px;
  }
  .trail {
    margin-top: 7px;
  }
  .workbench {
    border-left: 0;
    border-top: 1px solid var(--line);
    display: grid;
    grid-template-columns: 1fr 1fr;
    column-gap: 16px;
    padding: 18px 16px;
  }
  .possibility-panel {
    grid-column: 1/-1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    column-gap: 10px;
    border-bottom: 1px solid var(--line);
    padding-bottom: 15px;
    margin-bottom: 16px;
  }
  .count-label {
    grid-column: 1;
    grid-row: 1;
    justify-content: start;
    gap: 12px;
  }
  .count {
    grid-column: 1;
    grid-row: 2/4;
    margin: 9px 0 0;
    font-size: 52px;
  }
  .count.long {
    font-size: 42px;
  }
  #count-description {
    grid-column: 2;
    grid-row: 1/3;
    align-self: center;
    font-size: 11px;
  }
  .preview-line {
    grid-column: 2;
    grid-row: 3;
    padding: 0;
    margin: 5px 0 0;
    border: 0;
    min-height: 0;
    font-size: 9px;
  }
  .exact-badge {
    font-size: 6px;
  }
  .pieces-header {
    grid-column: 1/-1;
    margin-bottom: 12px;
  }
  .pieces {
    grid-column: 1/-1;
    grid-template-columns: repeat(6, 1fr);
    gap: 6px;
  }
  .piece-card {
    min-height: 72px;
    padding: 10px 3px 7px;
  }
  .piece-card svg {
    height: 31px;
    max-width: 43px;
  }
  .piece-number {
    font-size: 8px;
  }
  .piece-controls {
    grid-column: 1;
    gap: 6px;
    margin-top: 12px;
  }
  .piece-controls button {
    font-size: 10px;
    gap: 4px;
    padding: 10px 3px;
  }
  .piece-controls kbd {
    display: none;
  }
  .place-button {
    grid-column: 2;
    margin-top: 12px;
    font-size: 10px;
    padding: 8px 5px;
  }
  .help-actions {
    grid-column: 1/-1;
    margin-top: 17px;
    justify-content: start;
    gap: 26px;
  }
  .message {
    grid-column: 1/-1;
    font-size: 10px;
    min-height: 0;
    margin: 12px 0 0;
  }
  .underneath {
    display: block;
    margin: 23px 0 28px;
  }
  .invitation {
    margin-bottom: 22px;
  }
  .invitation p {
    font-size: 11px;
  }
  details {
    font-size: 11px;
  }
  footer {
    font-size: 8px;
    flex-direction: column;
    gap: 7px;
    padding: 18px 0 24px;
  }
  .solved-stamp {
    width: 215px;
    padding: 17px;
  }
}
@media (max-width: 740px) {
  .masthead {
    padding: 13px 0;
  }
  .intro {
    padding: 19px 0 18px;
  }
  h1 {
    font-size: 36px;
  }
  .eyebrow {
    font-size: 7px;
    margin-bottom: 8px;
  }
  .intro-copy {
    font-size: 11px;
    margin-top: 9px;
  }
  .board-picker {
    margin-bottom: 13px;
  }
  .board-option {
    padding: 8px 6px;
    min-height: 36px;
    font-size: 9px;
    gap: 5px;
  }
  .board-option .board-num {
    font-size: 7px;
  }
  .playground {
    display: grid;
    grid-template-columns: 1fr 1fr;
    padding: 15px;
    column-gap: 12px;
    overflow: visible;
    background: #143138;
  }
  .play-area,
  .workbench {
    display: contents;
  }
  .board-toolbar {
    grid-column: 1/-1;
    order: 0;
    margin-bottom: 14px;
  }
  .possibility-panel {
    grid-column: 1/-1;
    order: 1;
    display: grid;
    grid-template-columns: 72px 1fr;
    column-gap: 16px;
    margin: 0;
    padding: 0 0 11px;
  }
  .count-label {
    grid-column: 1;
    grid-row: 1;
  }
  .count-label .small-label {
    font-size: 7px;
    white-space: nowrap;
    letter-spacing: 0.6px;
  }
  .exact-badge {
    display: none;
  }
  .count {
    font-size: 34px;
    grid-column: 1;
    grid-row: 2/4;
    margin-top: 3px;
    letter-spacing: -1px;
  }
  .count.long {
    font-size: 29px;
  }
  #count-description {
    grid-column: 2;
    grid-row: 1/3;
    font-size: 10px;
    align-self: end;
    line-height: 1.4;
  }
  .preview-line {
    grid-column: 2;
    grid-row: 3;
    font-size: 9px;
    line-height: 1.4;
    margin: 4px 0 1px;
  }
  .board-stage {
    grid-column: 1/-1;
    order: 2;
    padding: 15px 8px 10px;
    min-height: 0;
  }
  .board {
    max-width: 285px;
  }
  .board-help {
    grid-column: 1/-1;
    order: 3;
    font-size: 9px;
    margin: 0 0 16px;
  }
  .pieces-header {
    grid-column: 1/-1;
    order: 4;
    margin: 0 0 9px;
  }
  .pieces {
    grid-column: 1/-1;
    order: 5;
  }
  .piece-card {
    min-height: 63px;
    padding: 8px 2px 5px;
    gap: 5px;
  }
  .piece-card svg {
    height: 28px;
    max-width: 38px;
  }
  .piece-number {
    font-size: 7px;
  }
  .piece-controls {
    grid-column: 1;
    order: 6;
  }
  .place-button {
    grid-column: 2;
    order: 6;
  }
  .help-actions {
    grid-column: 1/-1;
    order: 7;
  }
  .message {
    grid-column: 1/-1;
    order: 8;
    margin-bottom: 12px;
  }
  .trail-section {
    grid-column: 1/-1;
    order: 9;
    padding-top: 10px;
  }
  .trail-section > .small-label {
    font-size: 7px;
  }
  .trail {
    margin-top: 5px;
  }
  .trail-step {
    font-size: 9px;
  }
  .board-actions .quiet-button {
    font-size: 10px;
  }
  .underneath {
    margin-top: 21px;
  }
  .solved-stamp {
    width: 210px;
  }
}
@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    scroll-behavior: auto !important;
  }
}
@media (max-width: 740px) {
  .possibility-panel {
    position: sticky;
    top: 0;
    z-index: 6;
    background: #143138;
    padding-top: 10px;
    box-shadow: 0 6px 8px #14313888;
  }
}

/* Keep all six boards visible, with enough room for the larger tile sets. */
.board-picker {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 8px;
}
.board-option {
  padding: 12px 10px;
  gap: 9px;
  text-align: left;
  min-height: 64px;
}
.board-copy {
  display: flex;
  flex-direction: column;
  gap: 4px;
  line-height: 1.25;
}
.board-meta {
  font: 8px var(--mono);
  letter-spacing: 0;
  color: var(--faint);
}
.board-option[aria-pressed="true"] .board-meta {
  color: #526d70;
}
.pieces.many-pieces {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 6px;
}
.board.large-board {
  width: min(100%, var(--board-width));
  max-width: calc(340px * var(--board-ratio));
}
.many-pieces .piece-card {
  min-height: 69px;
  padding: 8px 3px 6px;
  gap: 6px;
}
.many-pieces .piece-card svg {
  height: 31px;
  max-width: 39px;
}
.many-pieces .piece-number {
  font-size: 8px;
  letter-spacing: 0;
}
@media (max-width: 1000px) {
  .board-option {
    gap: 6px;
    font-size: 10px;
  }
  .board-meta {
    font-size: 7px;
  }
  .board-option .board-num {
    font-size: 8px;
  }
}
@media (max-width: 740px) {
  .board-picker {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 6px;
  }
  .board-option {
    grid-column: span 2;
    padding: 9px 6px;
    min-height: 54px;
    justify-content: flex-start;
    font-size: 9px;
  }
  .board-copy {
    gap: 4px;
  }
  .board-meta {
    font-size: 7px;
  }
  .pieces.many-pieces {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
  .many-pieces .piece-card {
    min-height: 63px;
    padding: 7px 2px 5px;
    gap: 5px;
  }
  .many-pieces .piece-card svg {
    height: 28px;
    max-width: 36px;
  }
  .many-pieces .piece-number {
    font-size: 7px;
  }
  .count.long {
    font-size: 20px;
  }
  .possibility-panel {
    grid-template-columns: 96px 1fr;
    column-gap: 12px;
  }
  .board.large-board {
    max-width: 100%;
    max-height: none;
  }
}
.counting .exact-badge {
  color: var(--muted);
  border-color: var(--line);
}
.counting .exact-badge::before {
  content: "";
  display: inline-block;
  width: 5px;
  height: 5px;
  margin-right: 5px;
  border-radius: 50%;
  background: var(--accent);
  animation: count-pulse 1.2s ease-in-out infinite alternate;
}
.engine-stats {
  flex-wrap: wrap;
}
.count-error {
  flex-basis: 100%;
  color: var(--danger);
  font-size: 11px;
}
#retry-count {
  color: var(--accent);
  margin-top: 8px;
  text-decoration: underline;
  text-underline-offset: 3px;
}
@keyframes count-pulse {
  from {
    opacity: 0.3;
  }
  to {
    opacity: 1;
  }
}
@media (max-width: 740px) {
  #retry-count {
    grid-column: 1/-1;
    grid-row: 4;
    justify-self: start;
    font-size: 10px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .counting .exact-badge::before {
    animation: none;
  }
}

/* Make a large solution space readable as choices for the next tile. */
.pieces-header {
  align-items: center;
  gap: 8px;
}
.selection-copy {
  text-align: right;
  line-height: 1.3;
}
.selection-options {
  display: block;
  margin-top: 4px;
  font: 9px var(--mono);
  color: var(--muted);
}
.preview-line {
  min-height: 68px;
}
.preview-main {
  display: block;
}
.preview-detail {
  display: block;
  margin-top: 5px;
  font: 11px/1.45 var(--sans);
  color: var(--muted);
}
.preview-detail:empty {
  display: none;
}
.preview-line.warning .preview-detail {
  color: var(--danger);
}
.play-area > .message {
  margin: -10px 0 16px;
  min-height: 36px;
  text-align: center;
}
.finish-browser {
  border: 1px solid #486568;
  border-radius: 6px;
  background: #123037;
  padding: 12px 13px;
  margin: -10px 0 23px;
}
.finish-navigation {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.finish-navigation button {
  font-size: 11px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: #1b3e45;
  padding: 8px 10px;
  white-space: nowrap;
}
.finish-navigation button:hover:enabled {
  border-color: var(--mint);
  background: #274c50;
}
.finish-navigation button:disabled {
  opacity: 0.3;
}
#finish-label {
  font: 10px/1.5 var(--mono);
  text-align: center;
  color: var(--ink);
}
#finish-description {
  font-size: 11px;
  line-height: 1.5;
  color: var(--muted);
  margin: 10px 0 0;
}
.finish-pieces {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 11px;
  margin-top: 8px;
}
.finish-pieces:empty {
  display: none;
}
.changed-piece {
  font: 9px var(--mono);
  color: var(--ink);
  display: inline-flex;
  align-items: center;
  gap: 5px;
}
.changed-piece::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--piece-color);
}
.piece-card.comparison-changed {
  border-color: var(--piece-color);
}
.cell.peek.finish-unchanged {
  background: color-mix(in srgb, var(--piece-color) 20%, #213e44);
}
.cell.peek.finish-changed {
  background: color-mix(in srgb, var(--piece-color) 67%, #213e44);
  z-index: 1;
}
.cell.finish-changed[data-top="true"] {
  border-top-color: #f3f0e1;
}
.cell.finish-changed[data-right="true"] {
  border-right-color: #f3f0e1;
}
.cell.finish-changed[data-bottom="true"] {
  border-bottom-color: #f3f0e1;
}
.cell.finish-changed[data-left="true"] {
  border-left-color: #f3f0e1;
}
.cell.peek.finish-changed::after {
  background: #f3f0e188;
}
.browsing-finishes .cell:not(.filled) {
  cursor: default;
}
@media (max-width: 740px) {
  .selection-options {
    font-size: 8px;
    margin-top: 3px;
  }
  .preview-line {
    min-height: 38px;
  }
  .preview-detail {
    font-size: 9px;
    line-height: 1.35;
    margin-top: 3px;
  }
  .play-area > .message {
    margin: 12px 0;
    min-height: 0;
    text-align: left;
  }
  .finish-browser {
    grid-column: 1/-1;
    order: 3;
    margin: 0 0 16px;
    padding: 10px;
  }
  .finish-navigation {
    gap: 6px;
  }
  .finish-navigation button {
    font-size: 10px;
    padding: 8px 7px;
  }
  #finish-label {
    font-size: 9px;
  }
  #finish-description {
    font-size: 10px;
  }
}