.page-matroid-coloring #matroid-coloring-book {
  padding-top: calc(var(--nav-height) + var(--space-lg));
}

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

.matroid-canvas-wrap,
.matroid-sidebar {
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  background: var(--color-bg-alt);
}

.matroid-canvas-wrap {
  padding: 0.8rem;
}

.matroid-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.8rem;
}

.matroid-toolbar label {
  font-size: 0.9rem;
  font-weight: 500;
}

.matroid-toolbar input {
  width: 4rem;
  padding: 0.35rem 0.45rem;
  border: 1px solid var(--color-border);
  border-radius: 0.45rem;
  background: var(--color-bg);
  color: var(--color-text);
}

.matroid-rect-btn {
  font: inherit;
  padding: 0.45rem 0.85rem;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  background: var(--color-bg-alt);
  color: var(--color-text);
  cursor: pointer;
}

.matroid-rect-btn:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-primary);
}

.matroid-icon-btn {
  width: 2.1rem;
  height: 2.1rem;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.matroid-icon-btn svg {
  width: 16px;
  height: 16px;
}

#lattice-svg {
  width: 100%;
  min-height: 540px;
  display: block;
}

#overlay-lattice-svg {
  width: 100%;
  min-height: 78vh;
  display: block;
  border: 1px solid var(--color-border);
  border-radius: 0.6rem;
  background: var(--color-bg);
  cursor: grab;
}

#overlay-lattice-svg.is-panning {
  cursor: grabbing;
}

.matroid-sidebar {
  padding: 0.85rem;
}

.matroid-sidebar h2 {
  font-size: 1rem;
  margin: 0 0 0.5rem;
}

#selected-node-label {
  margin: 0 0 0.7rem;
  color: var(--color-text-muted);
  font-size: 0.92rem;
}

.rank-palette {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 0.45rem;
}

.sidebar-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-top: 0.65rem;
}

.sidebar-actions .btn-sm[disabled] {
  opacity: 0.55;
  cursor: not-allowed;
}

.geometric-lattice-view {
  margin-top: 0.8rem;
  border: 1px solid var(--color-border);
  border-radius: 0.6rem;
  background: var(--color-bg);
  padding: 0.55rem;
  cursor: zoom-in;
}

.geometric-lattice-title {
  margin: 0 0 0.45rem;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.geometric-lattice-svg {
  width: 100%;
  min-height: 320px;
  display: block;
}

.sage-output {
  margin-top: 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: 0.6rem;
  background: var(--color-bg);
  padding: 0.55rem;
  color: var(--color-text);
  font-size: 0.78rem;
  line-height: 1.45;
  white-space: pre-wrap;
}

.sage-embed {
  margin-top: 0.75rem;
}

.sage-embed .sagecell_evalButton,
.sage-embed button.sagecell_evalButton {
  display: none !important;
}

.sage-panel {
  margin-top: 0.8rem;
}

.sage-panel .sage-embed,
.sage-panel .sage-output {
  width: 100%;
}

.geo-lattice-modal {
  position: fixed;
  inset: 0;
  z-index: 2600;
}

.geo-lattice-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.58);
}

.geo-lattice-modal-panel {
  position: relative;
  width: min(92vw, 1080px);
  max-height: 88vh;
  overflow: auto;
  margin: 5vh auto 0;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  padding: 0.75rem;
}

.lattice-editor-panel {
  width: min(95vw, 1320px);
}

.lattice-editor-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 0.55rem;
}

.lattice-editor-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 0.75rem;
}

.lattice-editor-sidebar {
  max-height: 78vh;
  overflow: auto;
}

#geo-lattice-modal-close {
  margin-bottom: 0;
}

#geo-lattice-modal-content .geometric-lattice-svg {
  min-height: 76vh;
  cursor: grab;
}

#geo-lattice-modal-content .geometric-lattice-svg.is-panning {
  cursor: grabbing;
}

.rank-btn {
  border: 1px solid var(--color-border);
  border-radius: 999px;
  background: var(--color-bg);
  color: var(--color-text);
  width: 2.05rem;
  height: 2.05rem;
  padding: 0;
  font-size: 0.82rem;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
}

.rank-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.matroid-note {
  margin-top: 0.9rem;
  font-size: 0.82rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.matroid-note span {
  white-space: nowrap;
}

.matroid-rules {
  margin-top: 0.65rem;
  border: 1px solid var(--color-border);
  border-radius: 0.55rem;
  background: var(--color-bg);
  padding: 0.5rem 0.6rem;
}

.matroid-rules-title {
  margin: 0 0 0.35rem;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-text);
}

.matroid-rules-list {
  margin: 0;
  padding-left: 1rem;
  font-size: 0.75rem;
  color: var(--color-text-muted);
  line-height: 1.4;
}

.matroid-rules-list li + li {
  margin-top: 0.25rem;
}

.lattice-edge {
  stroke: var(--color-border);
  stroke-width: 1.15;
}

.lattice-node {
  cursor: pointer;
}

.lattice-node circle {
  stroke: var(--color-border);
  stroke-width: 1.15;
}

.lattice-node.is-locked circle {
  stroke: #7f1d1d;
  stroke-width: 1.6;
}

.lattice-node text {
  fill: var(--color-text);
  font-size: 11px;
  text-anchor: middle;
  dominant-baseline: middle;
}

.lattice-node.is-selected circle {
  stroke: var(--color-primary);
  stroke-width: 2;
}

@media (max-width: 960px) {
  .matroid-layout {
    grid-template-columns: 1fr;
  }
  .lattice-editor-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 700px) {
  .matroid-canvas-wrap,
  .matroid-sidebar {
    padding: 0.65rem;
  }

  .matroid-toolbar {
    gap: 0.4rem;
  }

  .matroid-toolbar label {
    width: 100%;
  }

  .matroid-toolbar input {
    width: 3.5rem;
  }

  #lattice-svg {
    min-height: 360px;
  }

  .geometric-lattice-svg {
    min-height: 230px;
  }

  .geo-lattice-modal-panel {
    width: 96vw;
    max-height: 94vh;
    margin: 2.5vh auto 0;
    padding: 0.6rem;
  }

  #overlay-lattice-svg {
    min-height: 62vh;
  }

  .lattice-editor-sidebar {
    max-height: none;
  }

  .matroid-note span {
    white-space: normal;
  }

  .sage-embed,
  .sage-embed * {
    max-width: 100%;
    box-sizing: border-box;
  }

  .sage-embed {
    overflow-x: auto;
  }
}