.nim-app {
  --nim-mint: #6bcdbf;
  --nim-mint-light: #dffaf4;
  --nim-gold: #ffd166;
  --nim-rust: #c7653f;
  --nim-night: #071c18;
}

.nim-workspace {
  display: grid;
  grid-template-columns: minmax(285px, 325px) minmax(0, 1fr);
  grid-template-areas:
    "workspace-toolbar workspace-toolbar"
    "controls experience";
  align-items: start;
  gap: 1rem;
}

.nim-workspace-toolbar {
  grid-area: workspace-toolbar;
  display: flex;
  min-width: 0;
  align-items: center;
  gap: 1rem;
  padding: 0.6rem 0.7rem;
  border: 1px solid var(--hairline);
  background: var(--white);
}

.nim-display-options {
  display: flex;
  min-width: 0;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.45rem 1rem;
  margin: 0;
  padding: 0;
  border: 0;
}

.nim-display-options legend {
  float: left;
  margin-right: 0.15rem;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.62rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.nim-display-options label {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--ink);
  cursor: pointer;
  font-size: 0.76rem;
  font-weight: 600;
}

.nim-display-options input {
  width: 1rem;
  height: 1rem;
  margin: 0;
  accent-color: var(--forest);
}

.nim-fullscreen-button {
  flex: 0 0 auto;
  margin-left: auto;
  white-space: nowrap;
}

.nim-controls {
  grid-area: controls;
  max-height: calc(100vh - 104px);
  overflow-y: auto;
  scrollbar-width: thin;
}

.control-intro .section-kicker,
.nim-panel-heading .section-kicker {
  margin: 0 0 0.38rem;
  color: var(--forest);
}

.control-intro > p:last-child {
  margin: 0.6rem 0 1.15rem;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.55;
}

.pile-editors {
  display: grid;
  gap: 0.46rem;
}

.pile-editor {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 72px 36px;
  align-items: center;
  gap: 0.45rem;
}

.pile-editor label {
  color: var(--ink);
  font-size: 0.8rem;
  font-weight: 600;
}

.pile-editor input[type="number"] {
  width: 100%;
  min-height: 38px;
  padding: 0.38rem 0.48rem;
  border: 1px solid var(--hairline);
  border-radius: 0;
  background: var(--paper);
  color: var(--ink);
  text-align: center;
}

.pile-remove,
.inline-action,
.graph-tool {
  border: 1px solid var(--hairline);
  border-radius: 0;
  background: var(--paper);
  color: var(--ink);
  cursor: pointer;
}

.pile-remove {
  min-height: 38px;
  color: var(--orange);
  font-size: 1rem;
}

.pile-remove:disabled {
  cursor: not-allowed;
  opacity: 0.35;
}

.inline-action {
  width: 100%;
  min-height: 38px;
  margin-top: 0.55rem;
  font-size: 0.76rem;
  font-weight: 600;
}

.inline-action:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

.segmented-control {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border: 1px solid var(--hairline);
}

.segmented-control label {
  position: relative;
  cursor: pointer;
}

.segmented-control label + label {
  border-left: 1px solid var(--hairline);
}

.segmented-control input {
  position: absolute;
  opacity: 0;
}

.segmented-control span {
  display: grid;
  min-height: 40px;
  padding: 0.5rem;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 600;
  place-items: center;
}

.segmented-control input:checked + span {
  background: var(--forest);
  color: var(--white);
}

.segmented-control input:focus-visible + span {
  outline: 3px solid #f4a261;
  outline-offset: 3px;
}

.setup-feedback {
  min-height: 2.3em;
  margin: 0 0 0.75rem;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.63rem;
  line-height: 1.45;
}

.setup-feedback.is-error {
  color: var(--orange);
}

.nim-wide-button {
  width: 100%;
}

.nim-secondary-actions {
  margin-top: 0.65rem;
}

.strategy-note {
  margin-top: 1rem;
  padding-top: 0.85rem;
  border-top: 1px solid var(--hairline);
}

.strategy-note summary {
  color: var(--forest);
  cursor: pointer;
  font-family: var(--mono);
  font-size: 0.64rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.strategy-note p {
  margin: 0.75rem 0 0;
  color: var(--muted);
  font-size: 0.76rem;
  line-height: 1.58;
}

.nim-experience {
  grid-area: experience;
  display: grid;
  min-width: 0;
  grid-template-columns: minmax(330px, 0.38fr) minmax(430px, 0.62fr);
  grid-template-areas:
    "board graph"
    "telemetry telemetry"
    "note note";
  gap: 1rem;
}

.nim-board-panel,
.nim-graph-panel {
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--hairline);
  background: var(--white);
}

.nim-board-panel {
  grid-area: board;
}

.nim-graph-panel {
  grid-area: graph;
}

.nim-panel-heading {
  display: flex;
  min-height: 93px;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.05rem 1.15rem;
  border-bottom: 1px solid var(--hairline);
}

.nim-panel-heading h2 {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(1.45rem, 2vw, 1.8rem);
  font-weight: 500;
  line-height: 1.05;
}

.turn-chip {
  flex: 0 0 auto;
  padding: 0.4rem 0.55rem;
  border: 1px solid rgba(11, 87, 72, 0.28);
  background: rgba(107, 205, 191, 0.11);
  color: var(--forest);
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.turn-chip.is-computer {
  border-color: rgba(210, 154, 74, 0.36);
  background: rgba(210, 154, 74, 0.1);
  color: #8c5f18;
}

.turn-chip.is-finished {
  border-color: rgba(168, 79, 36, 0.35);
  background: rgba(168, 79, 36, 0.09);
  color: var(--orange);
}

.nim-position {
  display: grid;
  min-height: 310px;
  align-content: center;
  gap: 0.65rem;
  padding: 1.15rem;
  background:
    linear-gradient(rgba(23, 33, 29, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(23, 33, 29, 0.035) 1px, transparent 1px),
    var(--paper);
  background-size: 24px 24px;
}

.nim-pile-row {
  display: grid;
  min-width: 0;
  grid-template-columns: 36px minmax(0, 1fr) 28px;
  align-items: center;
  gap: 0.45rem;
}

.nim-pile-label,
.nim-pile-count {
  font-family: var(--mono);
  font-size: 0.64rem;
}

.nim-pile-label {
  color: var(--forest);
  font-weight: 500;
}

.nim-pile-count {
  color: var(--muted);
  text-align: right;
}

.nim-stones {
  display: flex;
  min-width: 0;
  gap: 3px;
  overflow-x: auto;
  padding: 5px 2px 7px;
  scrollbar-width: thin;
}

.nim-stone {
  position: relative;
  width: 29px;
  min-width: 29px;
  height: 34px;
  padding: 0;
  border: 1px solid #0b5748;
  border-radius: 50% 50% 46% 46%;
  background:
    radial-gradient(circle at 35% 28%, #f6fffb 0 9%, transparent 10%),
    linear-gradient(145deg, #75d8c8, #1b806d 70%);
  box-shadow: 0 3px 0 #0a5447;
  cursor: pointer;
  transition: filter 120ms ease, opacity 120ms ease, transform 120ms ease;
}

.nim-pile-row:nth-child(even) .nim-stone {
  border-color: #9b5c17;
  background:
    radial-gradient(circle at 35% 28%, #fff9df 0 9%, transparent 10%),
    linear-gradient(145deg, #ffd978, #d19835 72%);
  box-shadow: 0 3px 0 #996213;
}

.nim-stone:hover,
.nim-stone:focus-visible,
.nim-stone.is-remove {
  z-index: 1;
  filter: saturate(1.2) brightness(1.08);
  transform: translateY(-3px);
}

.nim-stone.is-remove {
  border-color: #a84f24;
  background:
    radial-gradient(circle at 35% 28%, #fff4ed 0 9%, transparent 10%),
    linear-gradient(145deg, #f2aa84, #b75932 72%);
  box-shadow: 0 3px 0 #803416;
}

.nim-stone:disabled {
  cursor: wait;
  filter: grayscale(0.4);
  opacity: 0.55;
}

.empty-pile {
  display: inline-flex;
  min-height: 34px;
  align-items: center;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.62rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.move-preview {
  min-height: 46px;
  padding: 0.78rem 1.1rem;
  border-top: 1px solid var(--hairline);
  border-bottom: 1px solid var(--hairline);
  color: var(--muted);
  font-size: 0.76rem;
}

.legal-move-control {
  padding: 1rem 1.1rem;
  border-bottom: 1px solid var(--hairline);
}

.legal-move-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.55rem;
}

.legal-move-row select {
  min-width: 0;
  min-height: 42px;
  padding: 0.5rem;
  border: 1px solid var(--hairline);
  border-radius: 0;
  background: var(--paper);
  color: var(--ink);
}

.move-log {
  padding: 1rem 1.1rem 1.15rem;
}

.move-log-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

.move-log h3 {
  margin: 0;
  color: var(--forest);
  font-family: var(--mono);
  font-size: 0.64rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.move-log-heading span {
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.6rem;
}

.move-log ol {
  max-height: 114px;
  margin: 0.7rem 0 0;
  padding-left: 1.3rem;
  overflow-y: auto;
  color: var(--muted);
  font-size: 0.72rem;
  line-height: 1.55;
}

.move-log li::marker {
  color: var(--forest);
  font-family: var(--mono);
}

.move-log .is-placeholder {
  list-style: none;
  margin-left: -1.3rem;
  color: var(--muted);
  font-style: italic;
}

.graph-heading > p {
  max-width: 220px;
  margin: 0;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.61rem;
  line-height: 1.45;
  text-align: right;
}

.graph-toolbar {
  display: flex;
  min-height: 44px;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 0.6rem;
  border-bottom: 1px solid rgba(223, 248, 240, 0.14);
  background: #0b2824;
  color: rgba(255, 253, 247, 0.68);
}

.graph-tool {
  min-height: 31px;
  padding: 0.35rem 0.55rem;
  border-color: rgba(223, 248, 240, 0.2);
  background: rgba(255, 255, 255, 0.05);
  color: #e5f5ef;
  font-size: 0.67rem;
}

.graph-tool:hover {
  background: rgba(255, 255, 255, 0.1);
}

#nim-graph-help {
  margin-left: auto;
  font-family: var(--mono);
  font-size: 0.64rem;
  text-align: right;
}

.nim-graph-viewport {
  position: relative;
  min-height: 610px;
  overflow: hidden;
  background: var(--nim-night);
}

.nim-graph-renderer {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.graph-landmark-layer {
  position: absolute;
  z-index: 3;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.graph-landmark {
  position: absolute;
  display: block;
  padding: 0.26rem 0.38rem;
  border: 1px solid rgba(255, 255, 255, 0.7);
  background: rgba(5, 25, 22, 0.9);
  color: #fffdf7;
  font-family: var(--mono);
  font-size: 0.56rem;
  font-weight: 600;
  letter-spacing: 0.045em;
  line-height: 1;
  white-space: nowrap;
  transform: translate(-50%, calc(-100% - 10px));
  box-shadow: 0 2px 9px rgba(0, 0, 0, 0.28);
}

.graph-landmark[hidden] {
  display: none;
}

.graph-landmark-start {
  border-color: #a9c9ff;
  color: #d9e8ff;
}

.graph-landmark-victory {
  border-color: #8bf1dd;
  color: #c9fff4;
}

.graph-landmark-defeat {
  border-color: #f7a27d;
  color: #ffd8c4;
}

.nim-graph-renderer:focus-visible {
  outline: 3px solid #f4a261;
  outline-offset: -4px;
}

.nim-graph-renderer > div,
.nim-graph-renderer canvas,
.nim-canvas-graph {
  display: block;
}

.nim-graph-renderer canvas {
  touch-action: pan-y pinch-zoom !important;
}

.nim-canvas-graph {
  position: absolute;
  inset: 0;
  cursor: grab;
  touch-action: pan-y;
}

.nim-canvas-graph.is-dragging {
  cursor: grabbing;
}

.nim-canvas-graph.has-node {
  cursor: pointer;
}

.force-node-label,
.scene-tooltip {
  padding: 0.45rem 0.55rem;
  border: 1px solid rgba(223, 248, 240, 0.22);
  background: rgba(5, 25, 22, 0.91);
  color: #edf8f4;
  font-family: var(--mono);
  font-size: 0.68rem;
  line-height: 1.5;
}

.graph-tooltip {
  position: absolute;
  z-index: 4;
  top: 0.8rem;
  right: 0.8rem;
  max-width: min(250px, calc(100% - 1.6rem));
  padding: 0.65rem 0.75rem;
  border: 1px solid rgba(223, 248, 240, 0.2);
  background: rgba(5, 25, 22, 0.9);
  color: #edf8f4;
  font-family: var(--mono);
  font-size: 0.63rem;
  line-height: 1.5;
  pointer-events: none;
}

.graph-tooltip strong {
  color: var(--nim-gold);
  font-weight: 500;
}

.graph-fallback {
  position: absolute;
  z-index: 5;
  inset: 0;
  display: grid;
  padding: 2rem;
  background: var(--nim-night);
  color: #ffd8c4;
  place-items: center;
  text-align: center;
}

.graph-fallback[hidden],
.graph-tooltip[hidden] {
  display: none;
}

.graph-legend {
  position: absolute;
  z-index: 3;
  right: 0.8rem;
  bottom: 0.8rem;
  left: 0.8rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem 0.9rem;
  padding: 0.55rem 0.65rem;
  border: 1px solid rgba(223, 248, 240, 0.16);
  background: rgba(5, 25, 22, 0.78);
  color: rgba(255, 253, 247, 0.78);
  font-family: var(--mono);
  font-size: 0.64rem;
  pointer-events: none;
  backdrop-filter: blur(8px);
}

.graph-legend span {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.graph-legend .nim-sum-legend[hidden] {
  display: none;
}

.graph-legend i {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #27907b;
}

.graph-legend .legend-current {
  background: var(--nim-gold);
  box-shadow: 0 0 0 3px rgba(255, 209, 102, 0.28);
}

.graph-legend .legend-legal {
  border: 2px solid #fffdf7;
  background: #dffaf4;
}

.graph-legend .legend-start {
  border: 2px solid #d9e8ff;
  background: #6f9de2;
  box-shadow: 0 0 0 2px rgba(111, 157, 226, 0.28);
}

.graph-legend .legend-path {
  background: #62d8c2;
  box-shadow: 0 0 0 2px rgba(98, 216, 194, 0.28);
}

.graph-legend .legend-dim {
  border: 1px solid rgba(223, 248, 240, 0.3);
  background: #35514a;
  opacity: 0.48;
}

.graph-legend .legend-losing {
  border: 2px solid #efb08a;
  background: #7f3f29;
}

.graph-legend .legend-victory {
  border: 2px solid #eafffa;
  background: #56e3c4;
}

.graph-legend .legend-defeat {
  border: 2px solid #ffe5d8;
  background: #f07f52;
}

.nim-telemetry {
  grid-area: telemetry;
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.nim-note {
  grid-area: note;
}

.nim-note strong {
  color: var(--ink);
}

.nim-workspace.is-fullscreen {
  width: 100%;
  height: 100dvh;
  padding:
    max(0.55rem, env(safe-area-inset-top))
    max(0.55rem, env(safe-area-inset-right))
    max(0.55rem, env(safe-area-inset-bottom))
    max(0.55rem, env(safe-area-inset-left));
  overflow: hidden;
  align-items: stretch;
  grid-template-columns: minmax(235px, 285px) minmax(0, 1fr);
  grid-template-rows: auto minmax(0, 1fr);
  grid-template-areas:
    "workspace-toolbar workspace-toolbar"
    "controls experience";
  gap: 0.55rem;
  background: var(--paper-deep);
}

.nim-workspace.is-fullscreen .nim-controls {
  position: static;
  display: block;
  min-height: 0;
  max-height: 100%;
  overflow-y: auto;
}

.nim-workspace.is-fullscreen .nim-experience {
  height: 100%;
  min-height: 0;
  grid-template-columns: minmax(300px, 360px) minmax(0, 1fr);
  grid-template-rows: minmax(0, 1fr) auto;
  grid-template-areas:
    "board graph"
    "telemetry telemetry";
}

.nim-workspace.is-fullscreen .nim-board-panel,
.nim-workspace.is-fullscreen .nim-graph-panel {
  min-height: 0;
}

.nim-workspace.is-fullscreen .nim-board-panel {
  overflow-y: auto;
}

.nim-workspace.is-fullscreen .nim-graph-panel {
  display: grid;
  grid-template-rows: auto auto minmax(0, 1fr);
}

.nim-workspace.is-fullscreen .nim-graph-viewport {
  min-height: 0;
  height: auto;
}

.nim-workspace.is-fullscreen .nim-graph-renderer canvas {
  touch-action: none !important;
}

.nim-workspace.is-fullscreen .nim-position {
  min-height: 210px;
}

.nim-workspace.is-fullscreen .nim-note {
  display: none;
}

.nim-workspace:fullscreen::backdrop {
  background: var(--paper-deep);
}

@media (max-width: 1220px) {
  .nim-workspace {
    grid-template-columns: 1fr;
    grid-template-areas:
      "workspace-toolbar"
      "controls"
      "experience";
  }

  .nim-controls {
    position: static;
    display: grid;
    max-height: none;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 1rem;
  }

  .nim-controls .control-intro,
  .nim-controls .setup-feedback,
  .nim-controls .nim-wide-button,
  .nim-controls .nim-secondary-actions,
  .nim-controls .strategy-note {
    grid-column: 1 / -1;
  }

  .nim-controls .control-group {
    min-width: 0;
  }
}

@media (max-width: 920px) {
  .nim-experience {
    grid-template-columns: 1fr;
    grid-template-areas:
      "board"
      "graph"
      "telemetry"
      "note";
  }

  .nim-position {
    min-height: 250px;
  }

  .nim-graph-viewport {
    min-height: 560px;
  }

  .nim-workspace.is-fullscreen {
    height: 100dvh;
    grid-template-columns: 1fr;
    grid-template-rows: auto auto auto;
    grid-template-areas:
      "workspace-toolbar"
      "controls"
      "experience";
    align-content: start;
    overflow-y: auto;
  }

  .nim-workspace.is-fullscreen .nim-controls {
    max-height: none;
    overflow: visible;
  }

  .nim-workspace.is-fullscreen .nim-experience {
    height: auto;
    grid-template-columns: 1fr;
    grid-template-rows: auto;
    grid-template-areas:
      "board"
      "graph"
      "telemetry";
  }

  .nim-workspace.is-fullscreen .nim-graph-viewport {
    min-height: 58svh;
  }

  .nim-workspace.is-fullscreen .nim-workspace-toolbar {
    position: sticky;
    z-index: 20;
    top: max(0.55rem, env(safe-area-inset-top));
    box-shadow: 0 4px 18px rgba(5, 25, 22, 0.28);
  }
}

@media (max-width: 700px) {
  .nim-workspace-toolbar {
    align-items: stretch;
    flex-direction: column;
  }

  .nim-display-options {
    align-items: flex-start;
    flex-direction: column;
  }

  .nim-display-options legend {
    margin-bottom: 0.2rem;
  }

  .nim-fullscreen-button {
    width: 100%;
    margin-left: 0;
  }

  .nim-controls {
    display: block;
  }

  .nim-panel-heading,
  .graph-heading {
    min-height: 0;
    align-items: flex-start;
    flex-direction: column;
  }

  .graph-heading > p {
    max-width: none;
    text-align: left;
  }

  .graph-toolbar {
    flex-wrap: wrap;
  }

  #nim-graph-help {
    width: 100%;
    margin: 0.2rem 0 0;
    text-align: left;
  }

  .nim-graph-viewport {
    min-height: 58svh;
  }

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

  .nim-telemetry .telemetry-item,
  .nim-telemetry .telemetry-item:nth-child(2) {
    border-right: 1px solid var(--hairline);
    border-bottom: 1px solid var(--hairline);
  }

  .nim-telemetry .telemetry-item:nth-child(even) {
    border-right: 0;
  }

  .nim-telemetry .telemetry-item:last-child {
    grid-column: 1 / -1;
    border-right: 0;
    border-bottom: 0;
  }
}

@media (max-width: 480px) {
  .legal-move-row {
    grid-template-columns: 1fr;
  }

  .nim-position {
    padding: 0.85rem 0.75rem;
  }

  .nim-pile-row {
    grid-template-columns: 31px minmax(0, 1fr) 23px;
    gap: 0.3rem;
  }

  .nim-stone {
    width: 27px;
    min-width: 27px;
    height: 32px;
  }

  .graph-legend {
    position: absolute;
    border-right: 0;
    border-bottom: 0;
    border-left: 0;
    background: #0b2824;
  }
}

@media (prefers-reduced-motion: reduce) {
  .nim-stone {
    transition-duration: 0.01ms !important;
  }
}