:root {
  color-scheme: dark;
  --bg: #141414;
  --panel: #191919;
  --panel-2: #282828;
  --panel-3: #383838;
  --line: #424242;
  --line-bright: #626262;
  --text: #ffffff;
  --muted: #bfbfbf;
  --dim: #858585;
  --accent: #fffa00;
  --accent-2: #ffcc1a;
  --accent-deep: #eeea00;
  --mint: #00ffa2;
  --magenta: #ff1aac;
  --cell-light: #f2f2f2;
  --cell-dark: #282828;
  --cell: 42px;
  --font-ui: "Noto Sans JP", "Segoe UI", Roboto, "Helvetica Neue", Arial, "Yu Gothic UI", Meiryo, sans-serif;
  --font-display: "Roboto Condensed", "Arial Narrow", "Segoe UI", sans-serif;
  --font-mono: "Cascadia Mono", Consolas, monospace;
  --stripe: linear-gradient(
    -45deg,
    transparent,
    transparent 16%,
    #424242 0,
    #424242 34%,
    transparent 0,
    transparent 66%,
    #424242 0,
    #424242 84%,
    transparent 0,
    transparent
  );
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  background: var(--bg);
}

body {
  margin: 0;
  min-width: 320px;
  background:
    radial-gradient(circle at 80% -10%, rgba(255, 250, 0, 0.08), transparent 34%),
    linear-gradient(90deg, rgba(255, 250, 0, 0.04) 0 1px, transparent 1px 100%),
    linear-gradient(0deg, rgba(255, 255, 255, 0.025) 0 1px, transparent 1px 100%),
    var(--bg);
  background-size: auto, 48px 48px, 48px 48px, auto;
  color: var(--text);
  font-family: var(--font-ui);
  font-size: 14px;
  line-height: 1.55;
}

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

button,
.file-button {
  min-height: 44px;
  border: 1px solid var(--line-bright);
  border-radius: 5px;
  background: var(--panel-3);
  color: var(--text);
  padding: 9px 14px;
  cursor: pointer;
  font-weight: 700;
  line-height: 1.1;
  text-align: center;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease, transform 0.15s ease;
}

button:hover,
.file-button:hover {
  background: #626262;
  border-color: #8f8f8f;
}

button:active,
.file-button:active {
  background: var(--panel-2);
  transform: translateY(1px);
}

button:focus-visible,
.file-button:focus-within,
input:focus,
select:focus,
textarea:focus {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

button.primary {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--panel);
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

button.primary:hover {
  background: var(--accent-deep);
  border-color: var(--accent-deep);
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid #666;
  border-radius: 4px;
  background: var(--cell-light);
  color: #191919;
  padding: 9px 10px;
  font-weight: 700;
}

input[type="file"] {
  display: none;
}

input[type="range"] {
  accent-color: var(--accent);
  padding: 0;
}

textarea {
  min-height: 220px;
  resize: vertical;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
}

.app {
  position: relative;
  min-height: 100vh;
  padding: 24px;
  overflow: hidden;
}

.app::before {
  content: "ENDFIELD";
  position: fixed;
  right: -0.08em;
  bottom: -0.22em;
  z-index: 0;
  pointer-events: none;
  color: rgba(255, 255, 255, 0.035);
  font-family: var(--font-display);
  font-size: clamp(90px, 18vw, 260px);
  font-weight: 700;
  line-height: 0.8;
  letter-spacing: -0.04em;
}

.topbar,
.layout {
  position: relative;
  z-index: 1;
}

.topbar {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 24px;
  align-items: start;
  margin-bottom: 22px;
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-left: 8px solid var(--accent);
  border-radius: 5px;
  background:
    linear-gradient(90deg, rgba(255, 250, 0, 0.13), transparent 38%),
    var(--panel);
}

.topbar::after {
  content: "";
  position: absolute;
  right: 18px;
  top: 16px;
  width: 180px;
  height: 10px;
  background: linear-gradient(90deg, #ff00f0 0 32%, #fffa00 32% 66%, #00ffa2 66%);
  opacity: 0.75;
}

h1,
h2 {
  margin: 0;
}

h1 {
  font-family: var(--font-display);
  font-size: clamp(38px, 6vw, 88px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  text-transform: uppercase;
}

h2 {
  color: var(--text);
  font-size: 18px;
  font-weight: 900;
  line-height: 1.25;
}

h2::before {
  content: "[ ";
  color: var(--accent);
  font-family: var(--font-display);
}

h2::after {
  content: " ]";
  color: var(--accent);
  font-family: var(--font-display);
}

.start-title {
  font-family: var(--font-display);
  font-size: clamp(34px, 4.8vw, 64px);
  letter-spacing: -0.02em;
  text-transform: uppercase;
}

.start-title::before {
  content: "[ START // ";
}

.start-title::after {
  content: " ]";
}

p {
  margin: 8px 0 0;
  color: var(--muted);
}

.topbar p {
  max-width: 720px;
  font-size: 14px;
  font-weight: 500;
  line-height: 1.7;
}

.actions,
.json-actions,
.solution-nav,
.section-head {
  display: flex;
  gap: 8px;
  align-items: center;
}

.actions {
  flex-wrap: wrap;
  justify-content: flex-end;
  padding-top: 30px;
}

.dev-only {
  display: none !important;
}

.layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

.panel {
  position: relative;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: rgba(25, 25, 25, 0.96);
  padding: 16px;
  box-shadow: none;
}

.panel::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 4px;
  background: var(--accent);
  opacity: 0.95;
}

.controls,
.output {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(260px, 0.72fr) minmax(620px, 1.28fr);
  gap: 14px;
  min-width: 0;
}

.reference-panel {
  grid-column: 1 / -1;
  grid-row: 1;
  min-width: 0;
}

.piece-panel {
  grid-column: 1;
  grid-row: 2;
  min-width: 0;
}

.board-panel {
  grid-column: 2;
  grid-row: 2;
  min-width: 0;
  overflow: hidden;
}

.reference-actions {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

.reference-primary-actions {
  display: flex;
  width: 100%;
  gap: 8px;
  align-items: stretch;
  flex-wrap: wrap;
}

.reference-panel .section-head {
  gap: 16px;
}

.board-size-inline {
  display: grid;
  grid-template-columns: auto 68px 68px auto max-content;
  gap: 8px;
  align-items: end;
  padding: 8px;
  border: 1px solid var(--line-bright);
  border-radius: 5px;
  background: var(--panel-2);
}

.board-size-inline > span {
  align-self: center;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  white-space: nowrap;
}

.board-size-inline .step-arrow {
  color: var(--accent);
  font-size: 18px;
  line-height: 1;
  padding-bottom: 10px;
}

.board-size-inline label {
  gap: 3px;
}

.board-size-inline input {
  padding: 7px 8px;
}

.create-board-button.created {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--panel);
}

.board-create-feedback {
  grid-column: 1 / -1;
  min-height: 16px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
}

.auto-analyze-note {
  max-width: 230px;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.45;
}

.reference-primary-actions > .primary,
.reference-primary-actions > .file-button {
  min-width: 140px;
}

.subtle-danger {
  border-color: var(--accent-2);
  background: transparent;
  color: var(--accent-2);
}

.subtle-danger:hover {
  background: rgba(255, 204, 26, 0.13);
  border-color: var(--accent-2);
}

.advanced-actions {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
}

.file-button {
  display: inline-flex;
  width: auto;
  align-items: center;
  justify-content: center;
  border-color: var(--accent);
  background: var(--accent);
  color: var(--panel);
  font-family: var(--font-display);
  font-size: 15px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.zoom-control {
  display: grid;
  grid-template-columns: auto 140px;
  gap: 8px;
  align-items: center;
  width: auto;
}

.mode-control {
  display: grid;
  grid-template-columns: auto 104px;
  gap: 8px;
  align-items: center;
  width: auto;
}

.bar-mode-control {
  grid-template-columns: auto 82px;
}

.reference-empty,
.reference-viewport {
  border: 1px solid var(--line-bright);
  border-radius: 5px;
  background: #101010;
}

.reference-empty {
  min-height: 160px;
  display: grid;
  place-items: center;
  color: var(--dim);
  padding: 24px;
  background-image: var(--stripe);
  background-size: 8px 8px;
}

.reference-viewport {
  overflow: auto;
  max-height: 520px;
  padding: 10px;
}

.reference-fallback {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 8px;
  margin: 8px 0 10px;
  color: var(--muted);
  font-size: 13px;
}

.reference-hint {
  margin: 0 0 12px;
  border-left: 4px solid var(--accent);
  background: rgba(255, 250, 0, 0.08);
  color: var(--muted);
  font-size: 12px;
  line-height: 1.65;
  padding: 10px 12px;
}

.flow-strip {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 8px;
  margin: 0 0 12px;
}

.flow-step {
  position: relative;
  display: grid;
  grid-template-columns: 30px 1fr;
  align-items: center;
  gap: 8px;
  min-height: 70px;
  padding: 9px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--panel-2);
  color: var(--muted);
  overflow: hidden;
}

.flow-step::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 3px;
  background: var(--line-bright);
}

.flow-step strong {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border: 1px solid var(--line-bright);
  border-radius: 3px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 13px;
}

.flow-step span {
  color: var(--text);
  font-size: 12px;
  font-weight: 900;
  line-height: 1.2;
}

.flow-step small {
  grid-column: 2;
  color: var(--muted);
  font-size: 10px;
  line-height: 1.35;
}

.flow-step-primary {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--panel);
}

.flow-step-primary::after {
  background: var(--panel);
}

.flow-step-primary strong {
  border-color: var(--panel);
  color: var(--panel);
}

.flow-step-primary span,
.flow-step-primary small {
  color: var(--panel);
}

.recognition-guide {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 10px;
  border: 1px solid var(--line-bright);
  border-radius: 5px;
  background: #101010;
}

.controls .guide-steps {
  display: grid;
  grid-template-columns: 1fr;
}

.guide-steps {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.guide-step {
  display: inline-grid;
  grid-template-columns: auto auto;
  gap: 8px;
  align-items: center;
  min-height: 30px;
  padding: 5px 8px;
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--muted);
  background: var(--panel-2);
  font-family: var(--font-mono);
  font-size: 11px;
}

.guide-step small {
  color: inherit;
  font-size: 10px;
}

.guide-step.done,
.guide-step.manual {
  border-color: var(--accent);
  color: var(--accent);
}

.guide-step.auto {
  border-color: var(--mint);
  color: var(--mint);
}

.guide-step.warn {
  border-color: var(--accent-2);
  color: var(--accent-2);
}

.guide-message {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.55;
}

.test-steps {
  color: var(--muted);
  font-size: 13px;
  margin-bottom: 10px;
}

.test-steps summary {
  cursor: pointer;
  color: var(--text);
}

.test-steps ol {
  margin: 8px 0 0;
  padding-left: 22px;
}

.reference-stage {
  position: relative;
  display: inline-block;
  transform-origin: top left;
}

.reference-viewport img {
  display: block;
  max-width: none;
}

.board-overlay {
  position: absolute;
  pointer-events: none;
  border: 2px solid var(--accent);
  background-image:
    linear-gradient(to right, rgba(255, 250, 0, 0.52) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 250, 0, 0.52) 1px, transparent 1px);
  box-shadow: 0 0 0 9999px rgba(0, 0, 0, 0.08);
}

.board-overlay.auto {
  border-color: var(--mint);
  background-image:
    linear-gradient(to right, rgba(0, 255, 162, 0.48) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(0, 255, 162, 0.48) 1px, transparent 1px);
}

.board-overlay.manual {
  border-color: var(--accent);
}

.debug-overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.debug-point {
  position: absolute;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--magenta);
  border: 1px solid #111;
  transform: translate(-50%, -50%);
}

.debug-region {
  position: absolute;
  border: 1px solid var(--magenta);
  background: rgba(255, 26, 172, 0.08);
}

.debug-label {
  position: absolute;
  min-width: 18px;
  height: 18px;
  display: grid;
  place-items: center;
  border-radius: 3px;
  background: var(--magenta);
  color: #111;
  font-size: 11px;
  font-weight: 900;
  transform: translate(-50%, -50%);
}

.reference-stage.selecting {
  cursor: crosshair;
}

.selection-point {
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid #111;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.grid-two {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

label {
  display: grid;
  gap: 5px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

.color-list,
.tool-list,
.piece-list {
  display: grid;
  gap: 8px;
}

.manual-section {
  display: grid;
  gap: 4px;
  padding: 12px 0 0;
  border-top: 1px solid var(--line);
}

.manual-section p {
  margin: 0;
  font-size: 12px;
}

.manual-subsection {
  display: grid;
  gap: 8px;
  padding-top: 12px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.control-hint {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
  line-height: 1.5;
}

.color-item,
.piece-card {
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 10px;
}

.color-item {
  display: grid;
  grid-template-columns: 32px 1fr auto;
  gap: 8px;
  align-items: center;
}

.swatch {
  width: 28px;
  height: 28px;
  border: 1px solid #d9d9d9;
  border-radius: 3px;
}

.tool-button {
  text-align: left;
}

.tool-button.active {
  border-color: var(--accent);
  background: var(--accent);
  color: var(--panel);
}

.section-head {
  justify-content: space-between;
  margin-bottom: 12px;
  align-items: flex-start;
}

.reference-panel > .section-head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.section-head p {
  max-width: 620px;
  font-size: 12px;
  line-height: 1.6;
}

#boardSizeLabel,
#solutionLabel {
  color: var(--accent);
  font-family: var(--font-mono);
  font-weight: 700;
}

.bulk-reqs {
  display: grid;
  gap: 8px;
  margin-bottom: 0;
}

.solve-console {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  align-items: stretch;
  min-width: 210px;
}

.board-tools-panel {
  margin-top: 0;
}

.board-tools-panel .tool-list {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.board-tools-panel .tool-button {
  min-height: 48px;
  padding: 9px 10px;
}

.solve-main-button {
  min-height: 56px;
  font-size: 20px;
}

.bulk-req-card {
  display: grid;
  grid-template-columns: 72px 1fr 1fr auto;
  gap: 8px;
  align-items: end;
  background: var(--panel-2);
  border: 1px solid var(--line);
  border-radius: 5px;
  padding: 8px;
}

.bulk-req-card strong {
  font-size: 13px;
}

.controls .bulk-req-card {
  grid-template-columns: 1fr;
  align-items: stretch;
}

.controls .bulk-req-card button {
  width: 100%;
}

.board-matrix {
  display: grid;
  grid-template-areas:
    "corner columns"
    "rows board";
  grid-template-columns: max-content max-content;
  grid-template-rows: max-content max-content;
  gap: 4px;
  align-items: start;
  width: max-content;
  overflow-x: auto;
  padding-bottom: 4px;
}

.board-work-area {
  display: grid;
  grid-template-columns: max-content minmax(210px, 1fr);
  gap: 14px;
  align-items: start;
}

.board-solution {
  grid-column: 1 / -1;
  min-width: 260px;
  align-self: stretch;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: #101010;
}

.compact-head {
  margin-bottom: 10px;
}

.board-solution .solution-grid {
  margin-top: 8px;
  width: max-content;
  max-width: 100%;
}

.corner-label {
  grid-area: corner;
  width: 96px;
}

.column-reqs {
  grid-area: columns;
  display: grid;
  gap: 3px;
}

.req-axis-row {
  display: grid;
  gap: 3px;
  align-items: center;
}

.board-row {
  display: flex;
  gap: 8px;
}

.row-reqs {
  grid-area: rows;
  display: flex;
  gap: 3px;
  align-items: start;
}

.req-axis-column {
  display: grid;
  gap: 3px;
  align-items: center;
}

.col-req {
  width: var(--cell);
}

.req-chip {
  position: relative;
  height: 22px;
  min-width: 28px;
  padding: 0 4px 0 8px;
  border-width: 1px;
  border-style: solid;
  background: #f2f2f2;
  color: #000000 !important;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 900;
  text-shadow: none;
}

.req-chip::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 3px;
  bottom: 3px;
  width: 3px;
  border-radius: 2px;
  background: var(--req-color, var(--accent));
}

.req-chip.auto,
.req-chip.detected {
  opacity: 0.72;
  border-style: dashed;
}

.req-chip.empty {
  opacity: 0.5;
}

.req-chip.inferred {
  background: #fffca8;
}

.req-chip.locked {
  background: #fff500;
  color: #000000 !important;
  box-shadow: inset 0 0 0 1px #191919;
}

.req-chip.user {
  opacity: 1;
  border-style: solid;
}

.req-axis-lock {
  position: relative;
  min-width: 52px;
  height: 22px;
  min-height: 22px;
  padding: 0 6px 0 10px;
  border-color: var(--line-bright);
  color: #ffffff !important;
  font-size: 10px;
  white-space: nowrap;
}

.req-axis-lock::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 4px;
  bottom: 4px;
  width: 3px;
  border-radius: 2px;
  background: var(--req-color, var(--accent));
}

.req-axis-lock.locked {
  border-color: var(--accent);
  background: var(--accent);
  color: #000000 !important;
}

.board-grid,
.solution-grid {
  grid-area: board;
  display: grid;
  gap: 3px;
  align-content: start;
}

.cell,
.piece-cell,
.solution-cell {
  width: var(--cell);
  height: var(--cell);
  border: 1px solid #666;
  background: var(--cell-light);
  display: grid;
  place-items: center;
  color: #111;
  font-size: 11px;
  font-weight: 900;
  user-select: none;
}

.cell {
  cursor: pointer;
}

.cell:hover,
.piece-cell:hover {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.cell.blocked,
.solution-cell.blocked {
  background-color: var(--cell-dark);
  background-image: var(--stripe);
  background-size: 8px 8px;
}

.cell.fixed,
.solution-cell.fixed {
  position: relative;
}

.cell.fixed::after,
.solution-cell.fixed::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 24px;
  height: 24px;
  background-image: url("./16285.png");
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  filter: drop-shadow(0 0 3px rgba(255, 250, 0, 0.85));
  transform: translate(-50%, -50%);
  z-index: 2;
}

.piece-card {
  display: grid;
  grid-template-columns: 1fr;
  grid-template-areas:
    "label"
    "controls"
    "preview"
    "grid"
    "candidates"
    "add";
  gap: 10px;
  align-items: start;
}

.piece-head {
  grid-area: controls;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 8px;
  align-items: end;
}

.piece-index {
  grid-area: label;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  align-self: center;
}

.piece-source-preview {
  grid-area: preview;
  display: grid;
  gap: 4px;
  color: var(--muted);
  font-size: 11px;
}

.piece-source-preview img {
  width: 82px;
  height: 82px;
  object-fit: contain;
  border: 1px solid var(--line-bright);
  border-radius: 4px;
  background: #101010;
}

.solution-cell.placed {
  border-color: transparent;
}

.solution-cell.fixed.placed {
  border-color: var(--line);
}

.solution-cell.edge-top {
  border-top: 3px solid #080c0d;
}

.solution-cell.edge-right {
  border-right: 3px solid #080c0d;
}

.solution-cell.edge-bottom {
  border-bottom: 3px solid #080c0d;
}

.solution-cell.edge-left {
  border-left: 3px solid #080c0d;
}

.piece-grid {
  grid-area: grid;
  display: grid;
  gap: 3px;
  width: max-content;
}

.piece-tools {
  grid-area: add;
  display: flex;
  gap: 8px;
  justify-content: flex-start;
  align-self: end;
}

.piece-candidate-tools {
  grid-area: candidates;
  display: flex;
  gap: 6px;
  align-items: center;
  align-self: end;
  flex-wrap: wrap;
}

.piece-candidate-label {
  color: var(--muted);
  font-size: 12px;
}

.piece-cell {
  width: 28px;
  height: 28px;
  cursor: pointer;
}

.piece-cell.off {
  background: #101010;
}

.status {
  min-height: 42px;
  border: 1px solid var(--line-bright);
  border-radius: 5px;
  background: #101010;
  padding: 10px;
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 12px;
}

.solve-console .status {
  min-height: 48px;
}

.solve-note {
  border: 1px solid var(--line);
  border-radius: 5px;
  background: var(--panel-2);
  color: var(--muted);
  padding: 10px;
  font-size: 12px;
  line-height: 1.6;
}

.side-note {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.6;
}

.status.error {
  border-color: var(--magenta);
  color: var(--magenta);
}

.status.loading {
  color: var(--accent);
}

.status.loading::before {
  content: "";
  display: inline-block;
  width: 12px;
  height: 12px;
  margin-right: 8px;
  border: 2px solid rgba(255, 250, 0, 0.3);
  border-top-color: var(--accent);
  border-radius: 50%;
  vertical-align: -2px;
  animation: spin 0.8s linear infinite;
}

.solve-main-button.loading::after,
button.loading::after {
  content: "";
  display: inline-block;
  width: 12px;
  height: 12px;
  margin-left: 8px;
  border: 2px solid rgba(25, 25, 25, 0.25);
  border-top-color: #191919;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.bar-candidate-panel {
  display: grid;
  gap: 10px;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: #101010;
  padding: 10px;
}

.bar-candidate-panel:empty {
  display: none;
}

.bar-candidate-head,
.bar-candidate-nav,
.bar-editor-title,
.bar-axis-block,
.bar-count-control {
  display: flex;
  align-items: center;
  gap: 8px;
}

.bar-candidate-head {
  justify-content: space-between;
}

.bar-candidate-note {
  color: var(--muted);
  font-size: 12px;
  line-height: 1.6;
}

.bar-editor {
  display: grid;
  gap: 10px;
}

.bar-editor-color {
  display: grid;
  gap: 7px;
  padding-top: 8px;
  border-top: 1px solid var(--line);
}

.bar-editor-title {
  justify-content: space-between;
  color: var(--muted);
  font-size: 12px;
}

.bar-editor-color.warn .bar-editor-title span {
  color: var(--accent-2);
}

.bar-axis-block {
  flex-wrap: wrap;
}

.bar-axis-block > span {
  width: 24px;
  color: var(--muted);
  font-size: 12px;
}

.bar-count-control {
  gap: 3px;
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 3px;
  background: var(--panel-2);
}

.bar-count-control.auto,
.bar-count-control.detected {
  opacity: 0.72;
  border-style: dashed;
}

.bar-count-control.empty {
  opacity: 0.58;
}

.bar-count-control.inferred {
  background: rgba(255, 250, 0, 0.12);
}

.bar-count-control.locked {
  border-color: var(--accent);
  background: var(--accent);
  color: #191919;
}

.bar-count-control.user {
  border-style: solid;
}

.bar-count-control button {
  width: 24px;
  height: 24px;
  min-height: 24px;
  padding: 0;
}

.bar-count-control strong {
  min-width: 18px;
  text-align: center;
}

.diagnostics {
  display: grid;
  gap: 6px;
  border: 1px solid var(--line);
  border-radius: 5px;
  background: #101010;
  padding: 10px;
  color: var(--muted);
  font-size: 12px;
}

.diagnostic-row {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 8px;
}

.diagnostic-row strong {
  font-weight: 900;
}

.diagnostic-row.warn span {
  color: var(--accent-2);
}

.diagnostic-row.ok span {
  color: var(--mint);
}

.diagnostic-wide {
  grid-template-columns: 56px 1fr;
  padding-bottom: 4px;
  border-bottom: 1px solid var(--line);
}

@media (max-width: 1180px) {
  .app {
    padding: 18px;
  }

  .layout {
    grid-template-columns: 280px minmax(0, 1fr);
  }

  .workspace {
    grid-template-columns: 1fr;
  }

  .reference-panel,
  .piece-panel,
  .board-panel {
    grid-column: 1;
  }

  .piece-panel {
    grid-row: 3;
  }

  .board-panel {
    grid-row: 2;
  }
}

@media (max-width: 900px) {
  .app {
    padding: 12px;
  }

  .topbar {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .topbar::after {
    right: 14px;
    top: 12px;
    width: 120px;
  }

  .actions {
    justify-content: flex-start;
    padding-top: 0;
  }

  .layout {
    grid-template-columns: 1fr;
  }

  .panel {
    padding: 14px;
  }

  .flow-strip {
    grid-template-columns: 1fr;
  }

  .reference-primary-actions,
  .solve-console {
    grid-template-columns: 1fr;
  }

  .board-work-area {
    grid-template-columns: 1fr;
    overflow-x: auto;
  }

  .piece-card {
    grid-template-columns: 1fr;
    grid-template-areas:
      "label"
      "controls"
      "preview"
      "grid"
      "candidates"
      "add";
  }

  .piece-tools {
    justify-content: flex-start;
  }
}

@media (max-width: 640px) {
  h1 {
    font-size: 38px;
  }

  .board-size-inline,
  .piece-head,
  .grid-two {
    grid-template-columns: 1fr;
  }

  .zoom-control,
  .mode-control,
  .bar-mode-control {
    width: 100%;
    grid-template-columns: 1fr;
  }
}