:root {
  --bg: #f3f5f1;
  --surface: #f8f9f5;
  --surface-raised: #ffffff;
  --surface-muted: #ebefe8;
  --ink: #151814;
  --muted: #677168;
  --border: #d8ded5;
  --accent: #245b4d;
  --accent-strong: #173f35;
  --brass: #b99753;
  --danger: #b24045;
  --success: #2f725f;
  --light-square: #e8ddc4;
  --dark-square: #4a705f;
  --target: #d7ad49;
  --selected: #2f739f;
  --panel-shadow: 0 12px 30px rgba(21, 24, 20, 0.06);
  --board-shadow: 0 24px 56px rgba(21, 24, 20, 0.16);
  --radius: 8px;
  --board-size: 640px;
  --square-size: calc(var(--board-size) / 8);
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family:
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
}

button,
input,
select,
textarea {
  font: inherit;
}

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

.app-shell {
  min-height: 100vh;
  padding: 22px;
}

.game-surface {
  max-width: 1180px;
  margin: 0 auto;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.eyebrow {
  margin: 0 0 6px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  color: var(--ink);
  font-size: 2.35rem;
  line-height: 1;
}

h2 {
  color: var(--ink);
  font-size: 0.92rem;
  line-height: 1.2;
}

.turn-card {
  min-width: 210px;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius);
  background: var(--surface-raised);
  box-shadow: var(--panel-shadow);
  color: var(--ink);
  text-align: left;
}

.turn-card strong {
  display: block;
  font-size: 1.05rem;
}

.turn-card span {
  display: block;
  margin-top: 3px;
  color: var(--muted);
  font-size: 0.82rem;
}

.top-actions {
  display: grid;
  grid-template-columns: minmax(200px, 1fr) 84px;
  gap: 8px 10px;
  align-items: stretch;
  min-width: 350px;
}

.top-actions .turn-card {
  min-width: 0;
}

.share-button {
  min-height: 58px;
}

.share-status {
  grid-column: 1 / -1;
  min-height: 18px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  line-height: 1.35;
  text-align: right;
}

.share-status.success {
  color: var(--success);
}

.share-status.error {
  color: var(--danger);
}

.mode-rail {
  display: grid;
  grid-template-columns: 154px minmax(360px, 1fr);
  gap: 12px;
  align-items: center;
  margin-bottom: 16px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-muted);
}

.mode-rail-label {
  display: grid;
  gap: 3px;
}

.mode-rail-label span {
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 900;
}

.mode-rail-label strong {
  color: var(--ink);
  font-size: 1rem;
  line-height: 1.2;
}

.mode-choice {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
}

.mode-card {
  display: grid;
  gap: 3px;
  min-height: 58px;
  min-width: 0;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-raised);
  color: var(--muted);
  cursor: pointer;
  text-align: left;
}

.mode-card[aria-pressed="true"] {
  border-color: var(--accent);
  background: #fff;
  color: var(--ink);
  box-shadow: 0 8px 20px rgba(20, 28, 24, 0.12);
}

.mode-card:disabled {
  cursor: not-allowed;
  opacity: 0.56;
}

.mode-title,
.mode-detail {
  display: block;
}

.mode-title {
  font-size: 1rem;
  font-weight: 900;
  line-height: 1.15;
}

.mode-detail {
  font-size: 0.76rem;
  font-weight: 800;
  line-height: 1.2;
}

.play-layout {
  display: grid;
  grid-template-columns: minmax(704px, 1fr) minmax(292px, 340px);
  grid-template-areas:
    "board state"
    "info state";
  gap: 16px;
  align-items: start;
}

.side-panel {
  display: grid;
  gap: 12px;
}

.state-panel {
  grid-area: state;
}

.info-panel {
  grid-area: info;
  grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.12fr) minmax(0, 0.86fr);
  align-items: start;
}

.panel-block {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-raised);
  box-shadow: var(--panel-shadow);
  padding: 15px;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 10px;
}

.soft-badge {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--surface-muted);
  color: var(--accent-strong);
  font-size: 0.76rem;
  font-weight: 800;
}

.status-line {
  min-height: 42px;
  padding: 10px 11px;
  border-radius: var(--radius);
  background: var(--surface-muted);
  color: var(--ink);
  font-size: 0.9rem;
  line-height: 1.35;
}

.status-line.win {
  background: var(--success);
  color: #fff;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 14px;
  margin-top: 12px;
}

.metric-grid > div {
  min-height: 58px;
  padding: 10px 0;
  border-top: 1px solid var(--border);
}

.metric-label {
  display: block;
  color: var(--muted);
  font-size: 0.74rem;
  font-weight: 800;
}

.metric-grid strong {
  display: block;
  margin-top: 6px;
  color: var(--ink);
  font-size: 1.3rem;
}

.selected-inline {
  display: grid;
  gap: 8px;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.selected-mini-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.selected-mini-head span {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 900;
}

.selected-inline .selected-piece,
.selected-inline .empty-state {
  min-height: 72px;
}

.control-stack {
  display: grid;
  gap: 10px;
  margin-bottom: 12px;
}

.control-group {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 8px;
  align-items: center;
}

.control-label {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
}

.segmented {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  min-height: 36px;
  padding: 3px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-muted);
}

.segment-button {
  min-width: 0;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.84rem;
  font-weight: 800;
}

.segment-button[aria-pressed="true"] {
  background: var(--surface-raised);
  color: var(--ink);
  box-shadow: 0 2px 8px rgba(20, 28, 24, 0.12);
}

.segment-button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

.engine-status {
  min-height: 30px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  line-height: 1.25;
}

.button-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.command {
  min-height: 40px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-raised);
  color: var(--ink);
  cursor: pointer;
  font-weight: 800;
}

.command:hover {
  border-color: var(--accent);
}

.command:focus-visible,
.mode-card:focus-visible,
.segment-button:focus-visible,
.square:focus-visible,
.toggle-row input:focus-visible {
  outline: 3px solid rgba(25, 127, 198, 0.38);
  outline-offset: 2px;
}

.command.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: #fff;
}

.command.primary:hover {
  background: var(--accent-strong);
}

.command.wide {
  width: 100%;
}

.command:disabled {
  cursor: not-allowed;
  opacity: 0.48;
}

.compact-details {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
}

.compact-details summary,
details.panel-block > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 38px;
  color: var(--ink);
  cursor: pointer;
  font-size: 0.9rem;
  font-weight: 900;
  list-style: none;
}

.compact-details summary::-webkit-details-marker,
details.panel-block > summary::-webkit-details-marker {
  display: none;
}

.compact-details summary::after,
details.panel-block > summary::after {
  content: "+";
  display: inline-grid;
  place-items: center;
  width: 24px;
  height: 24px;
  border-radius: 999px;
  background: var(--surface-muted);
  color: var(--accent-strong);
  font-size: 0.9rem;
  line-height: 1;
}

.compact-details[open] summary::after,
details.panel-block[open] > summary::after {
  content: "-";
}

.compact-details[open] summary,
details.panel-block[open] > summary {
  margin-bottom: 10px;
}

.options-details .replay-panel {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
}

.replay-panel {
  display: grid;
  gap: 8px;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
}

.replay-status {
  display: flex;
  align-items: center;
  min-height: 34px;
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 900;
  line-height: 1.25;
}

.replay-status.reviewing {
  border-color: rgba(185, 151, 83, 0.76);
  background: #fbf3dd;
  color: #5d4b1f;
}

.replay-buttons {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.toggle-row {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 38px;
  margin-top: 10px;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 800;
}

.toggle-row input {
  width: 18px;
  height: 18px;
  accent-color: var(--accent);
}

.toggle-row.disabled {
  opacity: 0.5;
}

.toggle-row.disabled input {
  cursor: not-allowed;
}

.online-panel {
  display: grid;
  gap: 8px;
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--border);
}

.online-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.online-head strong {
  color: var(--ink);
  font-size: 0.84rem;
}

.online-actions {
  display: grid;
  grid-template-columns: minmax(72px, 0.82fr) minmax(0, 1fr) minmax(62px, 0.72fr);
  gap: 8px;
}

.joined-actions {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.room-code-input {
  min-width: 0;
  min-height: 40px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
  padding: 0 10px;
  font-size: 0.84rem;
  font-weight: 900;
  text-transform: uppercase;
}

.room-code-input::placeholder {
  color: #8d968f;
  font-weight: 800;
  text-transform: none;
}

.room-code-input:focus-visible {
  outline: 3px solid rgba(25, 127, 198, 0.38);
  outline-offset: 2px;
}

.online-status {
  min-height: 34px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  line-height: 1.28;
}

.room-presence {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 6px;
}

.seat-pill {
  display: grid;
  gap: 2px;
  min-height: 46px;
  padding: 8px 9px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

.seat-pill strong {
  color: var(--ink);
  font-size: 0.78rem;
}

.seat-pill span {
  color: var(--muted);
  font-size: 0.72rem;
  font-weight: 900;
}

.seat-pill.online {
  border-color: rgba(47, 114, 95, 0.42);
  background: rgba(47, 114, 95, 0.08);
}

.seat-pill.online span {
  color: var(--success);
}

.seat-pill.waiting {
  border-color: rgba(185, 151, 83, 0.46);
  background: #fbf3dd;
}

.seat-pill.waiting span {
  color: #695426;
}

.room-sync-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  min-height: 26px;
}

.sync-token {
  display: inline-flex;
  align-items: center;
  min-height: 24px;
  padding: 0 8px;
  border-radius: 999px;
  background: var(--surface-muted);
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 900;
}

.online-status.connected {
  border-color: rgba(47, 114, 95, 0.4);
  background: rgba(47, 114, 95, 0.1);
  color: var(--success);
}

.online-status.waiting {
  border-color: rgba(185, 151, 83, 0.46);
  background: #fbf3dd;
  color: #695426;
}

.online-status.error {
  border-color: rgba(178, 64, 69, 0.4);
  background: rgba(178, 64, 69, 0.08);
  color: var(--danger);
}

.board-wrap {
  grid-area: board;
  justify-self: center;
  width: calc(var(--board-size) + 62px);
  max-width: 100%;
}

.board-row-wrap {
  display: grid;
  grid-template-columns: 24px var(--board-size) 24px;
  gap: 7px;
  align-items: center;
}

.board {
  display: grid;
  grid-template-columns: repeat(8, var(--square-size));
  grid-template-rows: repeat(8, var(--square-size));
  width: var(--board-size);
  height: var(--board-size);
  overflow: hidden;
  border: 1px solid #1e2822;
  border-radius: var(--radius);
  background: #141b17;
  box-shadow: var(--board-shadow);
}

.square {
  position: relative;
  display: grid;
  place-items: center;
  width: var(--square-size);
  height: var(--square-size);
  min-width: var(--square-size);
  min-height: var(--square-size);
  border: 0;
  padding: 0;
  color: var(--ink);
  cursor: pointer;
}

.square:disabled {
  cursor: wait;
}

.square:disabled .piece {
  filter: saturate(0.9);
}

.square.light {
  background: var(--light-square);
}

.square.dark {
  background: var(--dark-square);
}

.square.selected {
  box-shadow:
    inset 0 0 0 4px var(--selected),
    inset 0 0 0 7px rgba(255, 255, 255, 0.26);
}

.square.last-from::before,
.square.last-to::before {
  content: "";
  position: absolute;
  inset: 5px;
  border: 2px solid rgba(185, 151, 83, 0.88);
  border-radius: 5px;
  pointer-events: none;
}

.square.last-to::before {
  background: rgba(185, 151, 83, 0.18);
  border-color: rgba(21, 24, 20, 0.56);
}

.square.target::after {
  content: "";
  position: absolute;
  width: 28%;
  aspect-ratio: 1;
  border-radius: 999px;
  background: var(--target);
  box-shadow: 0 0 0 2px rgba(17, 22, 20, 0.34);
}

.square.capture-target::after {
  width: 74%;
  background: transparent;
  border: 4px solid var(--danger);
}

.target-candidates {
  position: absolute;
  right: 4px;
  bottom: 4px;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 30px;
  min-height: 18px;
  padding: 0 5px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 999px;
  background: rgba(21, 24, 20, 0.88);
  color: #f6dd9b;
  font-size: 0.58rem;
  font-weight: 900;
  line-height: 1;
  pointer-events: none;
}

.piece {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: calc(var(--square-size) - 14px);
  height: calc(var(--square-size) - 14px);
  max-width: 68px;
  max-height: 68px;
  min-width: 34px;
  min-height: 34px;
  border: 1px solid rgba(21, 24, 20, 0.16);
  border-radius: 50%;
  background: #fbf4df;
  box-shadow:
    0 8px 18px rgba(21, 24, 20, 0.18),
    inset 0 1px 0 rgba(255, 255, 255, 0.62);
}

.piece.black {
  border-color: rgba(255, 255, 255, 0.1);
  background: #202721;
  color: #f8f8ef;
}

.piece-symbol {
  font-size: 3.2rem;
  line-height: 1;
  transform: translateY(-2px);
}

.quantum-symbol {
  font-size: 2.8rem;
  font-weight: 900;
  line-height: 1;
}

.candidate-count {
  position: absolute;
  top: -2px;
  right: -2px;
  min-width: 22px;
  height: 22px;
  padding: 0 5px;
  border-radius: 999px;
  background: var(--accent);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 0.72rem;
  font-weight: 900;
}

.piece.black .candidate-count {
  background: #f3d98c;
  color: #202721;
}

.candidate-strip {
  position: absolute;
  left: 7%;
  right: 7%;
  bottom: 5%;
  min-height: 15px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.88);
  color: var(--ink);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2px;
  font-size: 0.6rem;
  font-weight: 900;
}

.piece.black .candidate-strip {
  background: rgba(0, 0, 0, 0.36);
  color: #f8f8ef;
}

.confirmed-type {
  position: absolute;
  left: 50%;
  bottom: 5%;
  min-width: 22px;
  min-height: 17px;
  padding: 0 6px;
  border-radius: 999px;
  background: rgba(21, 24, 20, 0.9);
  color: #f6dd9b;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.62rem;
  font-weight: 900;
  line-height: 1;
  transform: translateX(-50%);
}

.piece.black .confirmed-type {
  background: rgba(246, 221, 155, 0.94);
  color: #202721;
}

.file-labels,
.rank-labels {
  display: grid;
  color: #4f5a55;
  font-size: 0.76rem;
  font-weight: 900;
}

.file-labels {
  grid-template-columns: 24px repeat(8, var(--square-size)) 24px;
  padding: 0 7px;
}

.file-labels span {
  text-align: center;
}

.rank-labels {
  grid-template-rows: repeat(8, var(--square-size));
  align-self: stretch;
}

.rank-labels span {
  display: grid;
  place-items: center;
}

.selected-piece {
  min-height: 96px;
}

.empty-state {
  display: grid;
  place-items: center;
  min-height: 86px;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--muted);
  text-align: center;
  font-size: 0.9rem;
}

.selected-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 10px;
}

.candidate-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.candidate-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 30px;
  min-width: 44px;
  padding: 4px 8px;
  border-radius: 999px;
  background: var(--surface-muted);
  color: var(--accent-strong);
  font-size: 0.78rem;
  font-weight: 900;
}

.candidate-pill.confirmed {
  background: var(--success);
  color: #fff;
}

.move-hints {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 6px;
  margin-top: 10px;
}

.move-hints span {
  display: grid;
  place-items: center;
  min-height: 30px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: transparent;
  color: var(--muted);
  font-size: 0.74rem;
  font-weight: 900;
}

.rule-list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding-left: 17px;
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.45;
}

.feedback-form {
  display: grid;
  gap: 10px;
}

.feedback-form label {
  display: grid;
  gap: 6px;
}

.feedback-form label > span {
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 900;
}

.feedback-form select,
.feedback-form textarea,
.feedback-form input {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink);
  font-size: 0.86rem;
  line-height: 1.35;
}

.feedback-form select,
.feedback-form input {
  min-height: 38px;
  padding: 0 10px;
}

.feedback-form textarea {
  min-height: 96px;
  max-height: 180px;
  padding: 9px 10px;
  resize: vertical;
}

.feedback-form textarea::placeholder,
.feedback-form input::placeholder {
  color: #8d968f;
}

.feedback-form select:focus-visible,
.feedback-form textarea:focus-visible,
.feedback-form input:focus-visible {
  outline: 3px solid rgba(25, 127, 198, 0.38);
  outline-offset: 2px;
}

.feedback-status {
  min-height: 18px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
  line-height: 1.35;
}

.feedback-status.success {
  color: var(--success);
}

.feedback-status.error {
  color: var(--danger);
}

.captured-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.capture-title {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 900;
}

.captured-list {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  min-height: 35px;
}

.captured-token {
  display: inline-grid;
  place-items: center;
  min-width: 32px;
  height: 32px;
  padding: 0 9px;
  border-radius: 999px;
  background: var(--surface-muted);
  color: var(--accent-strong);
  font-size: 0.74rem;
  font-weight: 900;
}

.move-log {
  display: grid;
  gap: 7px;
  max-height: 270px;
  overflow: auto;
  margin: 0;
  padding-left: 22px;
  color: var(--muted);
  font-size: 0.83rem;
  line-height: 1.36;
}

.move-log li::marker {
  color: var(--accent);
  font-weight: 900;
}

.history-stack {
  display: grid;
  gap: 12px;
}

@media (max-width: 1260px) {
  :root {
    --board-size: 560px;
  }

  .play-layout {
    grid-template-columns: minmax(622px, 1fr) minmax(285px, 320px);
  }

  .info-panel {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 920px) {
  :root {
    --board-size: 320px;
  }

  .app-shell {
    padding: 14px;
  }

  h1 {
    font-size: 2.2rem;
  }

  .topbar {
    align-items: stretch;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 14px;
    padding-bottom: 12px;
  }

  .turn-card {
    min-width: 0;
    text-align: left;
  }

  .top-actions {
    grid-template-columns: minmax(0, 1fr) 86px;
    min-width: 0;
  }

  .share-status {
    text-align: left;
  }

  .share-button {
    min-height: 58px;
  }

  .mode-rail {
    grid-template-columns: 1fr;
    gap: 10px;
    margin-bottom: 14px;
    padding: 10px;
  }

  .mode-card {
    min-height: 56px;
  }

  .play-layout {
    grid-template-columns: 1fr;
    grid-template-areas:
      "board"
      "state"
      "info";
  }

  .state-panel,
  .info-panel {
    grid-template-columns: 1fr;
  }

  .board-wrap {
    width: calc(var(--board-size) + 40px);
  }

  .board-row-wrap {
    grid-template-columns: 16px var(--board-size) 16px;
    gap: 4px;
  }

  .file-labels {
    grid-template-columns: 16px repeat(8, var(--square-size)) 16px;
    padding: 0 4px;
  }

  .candidate-strip {
    display: none;
  }

  .target-candidates {
    display: none;
  }

  .piece {
    width: calc(var(--square-size) - 6px);
    height: calc(var(--square-size) - 6px);
  }

  .piece-symbol {
    font-size: 2rem;
  }

  .quantum-symbol {
    font-size: 1.9rem;
  }

  .candidate-count {
    min-width: 18px;
    height: 18px;
    font-size: 0.62rem;
  }

  .confirmed-type {
    min-width: 18px;
    min-height: 14px;
    padding: 0 4px;
    font-size: 0.55rem;
  }
}

@media (max-width: 370px) {
  :root {
    --board-size: 296px;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .square,
  .command,
  .mode-card,
  .piece,
  .segment-button {
    transition:
      transform 120ms ease,
      border-color 120ms ease,
      box-shadow 120ms ease,
      background-color 120ms ease;
  }

  .square:hover .piece {
    transform: translateY(-2px);
  }
}