:root {
  --sq-bg: #f9f9f9;
  --sq-surface: #ffffff;
  --sq-text: #000000;
  --sq-muted: #6b6b6b;
  --sq-border: #dddddd;
  --sq-accent: #5f7f67;
  --sq-accent-dark: #3f5f45;
  --sq-header: #8da08d;
  --sq-soft: #f7f7f7;
  --sq-warm: #f3f5f3;
  --sq-chart-neutral: #c7cdc8;
  --sq-chart-selected: #50769b;
  --sq-graph-edge: #87938a;
  --sq-max: 1120px;
  --sq-radius: 4px;
  --sq-shadow: 0 8px 20px rgba(0, 0, 0, 0.05);
}

html {
  scroll-behavior: smooth;
}

body {
  background: var(--sq-bg);
  color: var(--sq-text);
  font-family: "Open Sans", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.72;
}

a {
  color: var(--sq-accent);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--sq-accent-dark);
}

a:focus-visible,
button:focus-visible,
.button:focus-visible,
.navbar a:focus-visible {
  outline: 3px solid rgba(95, 127, 103, 0.38);
  outline-offset: 3px;
  border-radius: 4px;
}

.navbar {
  background: rgba(141, 160, 141, 0.9) !important;
  border-bottom: 0;
  box-shadow: none;
}

.navbar-title {
  color: #6b6b6b;
  font-family: "Josefin Sans", Arial, sans-serif;
  font-size: 36px;
  font-weight: 300;
  letter-spacing: 0;
}

.navbar-nav .nav-link {
  color: #ffffff;
  font-family: "Josefin Sans", Arial, sans-serif;
  font-weight: 300;
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
  color: var(--sq-accent);
}

.quarto-title-banner {
  background: transparent;
}

.quarto-title-block {
  display: none;
}

main.content {
  max-width: var(--sq-max);
}

h1,
h2,
h3 {
  color: var(--sq-text);
  font-family: "Josefin Sans", Arial, sans-serif;
  font-weight: 300;
  letter-spacing: 0;
}

h1 {
  font-size: clamp(2.1rem, 4vw, 3rem);
  line-height: 1.15;
}

h2 {
  margin-top: 3rem;
  padding-top: 0.4rem;
  border-top: 1px solid var(--sq-border);
  font-size: 1.6rem;
}

h3 {
  font-size: 1.25rem;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) minmax(260px, 0.8fr);
  gap: 2rem;
  align-items: start;
  margin: 1.5rem 0 3rem;
  padding: 2rem 0;
}

.hero-copy > p:first-of-type {
  color: var(--sq-text);
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.35;
  margin-top: 0.6rem;
}

.hero-copy > p:nth-of-type(2) {
  color: var(--sq-muted);
  font-weight: 560;
}

.hero-note,
.notice,
.feature-card,
.app-card,
.timeline-item,
.pub-item {
  background: var(--sq-surface);
  border: 1px solid var(--sq-border);
  border-radius: var(--sq-radius);
}

.hero-note {
  box-shadow: var(--sq-shadow);
  padding: 1.25rem;
  border-left: 4px solid var(--sq-accent);
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 1.5rem 0;
}

.page-tools {
  display: flex;
  justify-content: flex-end;
  margin: 0.25rem 0 1.25rem;
}

.lang-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.15rem;
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--sq-border);
  border-radius: 6px;
  background: var(--sq-surface);
  color: var(--sq-muted);
  font-size: 0.9rem;
  font-weight: 650;
  text-decoration: none;
}

.lang-button:hover {
  border-color: var(--sq-accent);
  color: var(--sq-accent-dark);
  text-decoration: none;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 2.65rem;
  padding: 0.55rem 0.95rem;
  border: 1px solid var(--sq-border);
  border-radius: 6px;
  background: var(--sq-surface);
  color: var(--sq-text);
  font-weight: 650;
  text-decoration: none;
}

.button:hover {
  border-color: var(--sq-accent);
  color: var(--sq-accent-dark);
  text-decoration: none;
}

.button.primary {
  background: var(--sq-accent);
  border-color: var(--sq-accent);
  color: white;
}

.button.primary:hover {
  background: var(--sq-accent-dark);
  color: white;
}

.card-grid {
  display: grid;
  gap: 1rem;
  margin: 1.25rem 0 2rem;
}

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

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

.feature-card,
.app-card,
.pub-item {
  padding: 1.15rem;
}

.feature-card h3,
.app-card h3 {
  margin-top: 0;
}

.feature-card {
  border-top: 4px solid var(--sq-accent);
}

.app-card {
  background: linear-gradient(180deg, var(--sq-surface), var(--sq-soft));
}

.app-card code {
  display: inline-block;
  border: 1px solid rgba(95, 127, 103, 0.22);
  background: var(--sq-soft);
  color: var(--sq-accent-dark);
  border-radius: 999px;
  padding: 0.1rem 0.55rem;
  font-size: 0.82rem;
  font-weight: 700;
}

.card-link {
  font-weight: 700;
}

.notice {
  background: var(--sq-warm);
  padding: 1rem 1.1rem;
  color: var(--sq-text);
}

.timeline {
  display: grid;
  gap: 0.85rem;
  margin: 1rem 0 2rem;
}

.timeline-item {
  padding: 1rem 1.1rem;
  border-left: 4px solid var(--sq-accent);
}

.pub-list {
  display: grid;
  gap: 1rem;
}

.page-footer {
  background: var(--sq-header);
  border-top: 0;
  color: #ffffff;
}

@media (max-width: 900px) {
  .hero,
  .card-grid.three,
  .card-grid.two {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 2.4rem;
  }
}

@media (max-width: 520px) {
  body {
    font-size: 16px;
  }

  .hero {
    margin-top: 0.25rem;
    padding-top: 1rem;
  }

  .button {
    width: 100%;
  }
}

/* --- Embedded CV PDF ------------------------------------------------- */

.pdf-embed {
  margin: 1.25rem 0 2rem;
  border: 1px solid var(--sq-border);
  border-radius: var(--sq-radius);
  overflow: hidden;
  background: var(--sq-surface);
}

.pdf-embed object,
.pdf-embed iframe {
  display: block;
  width: 100%;
  height: 80vh;
  min-height: 480px;
  border: 0;
}

.pdf-embed .pdf-fallback {
  padding: 1.25rem;
  margin: 0;
}

.pdf-note {
  color: var(--sq-muted, #666);
  font-size: 0.9rem;
  margin-top: -0.5rem;
}

/* Mobile browsers generally cannot render an inline PDF, so rely on the
   buttons above the embed instead of showing an empty frame. */
@media (max-width: 768px) {
  .pdf-embed {
    display: none;
  }
}

/* --- Square-barrier scattering app ----------------------------------- */

/* Geometry is set inline by square-barrier.js; these are only the pre-script
   fallback and the frame. Do not rely on the height here. */
.sb-canvas {
  display: block;
  width: 100%;
  height: 420px;
  border: 1px solid var(--sq-border);
  border-radius: var(--sq-radius);
  background: var(--sq-surface);
}

.sb-controls {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.9rem;
  margin: 1rem 0 0.75rem;
}

.sb-control {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 0.2rem 0.6rem;
  font-size: 0.92rem;
}

.sb-control span {
  grid-column: 1 / -1;
}

.sb-control input[type="range"] {
  width: 100%;
}

.sb-control output {
  font-variant-numeric: tabular-nums;
  min-width: 3.2em;
  text-align: right;
}

.sb-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.sb-readout {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 0.6rem;
  margin: 0 0 0.5rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--sq-border);
  border-radius: var(--sq-radius);
  background: var(--sq-surface);
}

.sb-readout div {
  margin: 0;
}

.sb-readout dt {
  font-size: 0.8rem;
  opacity: 0.75;
  margin: 0;
}

.sb-readout dd {
  margin: 0;
  font-variant-numeric: tabular-nums;
  font-size: 1.05rem;
}

.sb-note {
  min-height: 1.4em;
  font-size: 0.9rem;
  color: var(--sq-accent-dark, #4a6350);
}

@media (max-width: 700px) {
  .sb-controls {
    grid-template-columns: 1fr;
  }

  .sb-canvas {
    height: 300px;
  }
}

/* --- QUBO / MaxCut explorer ----------------------------------------- */

.qm-app {
  margin: 1.5rem 0 2.5rem;
  overflow: hidden;
  border: 1px solid var(--sq-border);
  border-top: 3px solid var(--sq-accent);
  border-radius: var(--sq-radius);
  background: var(--sq-surface);
  box-shadow: var(--sq-shadow);
}

.qm-toolbar {
  display: grid;
  grid-template-columns: minmax(200px, 0.85fr) minmax(200px, 1fr) minmax(100px, 0.4fr) auto;
  gap: 0.85rem;
  align-items: end;
  padding: 1rem;
  border-bottom: 1px solid var(--sq-border);
  background: var(--sq-soft);
}

.qm-mode {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: 0;
  padding: 0;
  border: 0;
}

.qm-mode legend,
.qm-select-control > span,
.qm-number-control > span {
  display: block;
  grid-column: 1 / -1;
  margin-bottom: 0.3rem;
  color: var(--sq-muted);
  font-size: 0.78rem;
  font-weight: 600;
}

.qm-mode label {
  position: relative;
  margin: 0;
}

.qm-mode input {
  position: absolute;
  inline-size: 1px;
  block-size: 1px;
  opacity: 0;
}

.qm-mode label:first-of-type span {
  border-radius: 4px 0 0 4px;
}

.qm-mode label:last-of-type span {
  border-left: 0;
  border-radius: 0 4px 4px 0;
}

.qm-mode span {
  display: flex;
  min-height: 2.45rem;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--sq-border);
  background: var(--sq-surface);
  color: var(--sq-text);
  cursor: pointer;
  font-weight: 600;
}

.qm-mode input:checked + span {
  border-color: var(--sq-accent-dark);
  background: var(--sq-accent);
  color: #ffffff;
}

.qm-mode input:focus-visible + span {
  outline: 3px solid rgba(95, 127, 103, 0.38);
  outline-offset: 3px;
}

.qm-select-control,
.qm-number-control {
  display: block;
  margin: 0;
}

.qm-select-control select,
.qm-number-control input {
  width: 100%;
  min-height: 2.45rem;
  border: 1px solid var(--sq-border);
  border-radius: 4px;
  background: var(--sq-surface);
  color: var(--sq-text);
}

.qm-optimum {
  min-height: 2.45rem;
  white-space: nowrap;
}

.qm-optimum:disabled {
  border-color: rgba(95, 127, 103, 0.35);
  background: var(--sq-warm);
  color: var(--sq-accent-dark);
  cursor: default;
  opacity: 1;
}

.qm-summary {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-bottom: 1px solid var(--sq-border);
}

.qm-summary > div {
  display: flex;
  flex-direction: column;
  min-width: 0;
  gap: 0.12rem;
  padding: 0.8rem 1rem 0.9rem;
}

.qm-summary > div + div {
  border-left: 1px solid var(--sq-border);
}

.qm-summary span {
  color: var(--sq-muted);
  font-size: 0.82rem;
}

.qm-summary strong {
  font-size: 1.25rem;
  line-height: 1.25;
  font-variant-numeric: tabular-nums;
}

.qm-section {
  min-width: 0;
  padding: 1rem;
  border-bottom: 1px solid var(--sq-border);
}

.qm-section:last-child {
  border-bottom: 0;
}

.qm-section h2 {
  margin: 0 0 0.75rem;
  padding: 0;
  border: 0;
  font-size: 1.15rem;
  line-height: 1.3;
}

.qm-section-heading {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  align-items: center;
  justify-content: space-between;
}

.qm-section-heading h2 {
  margin-bottom: 0;
}

.qm-sense,
.qm-editor-hint,
.qm-panel-meta {
  color: var(--sq-muted);
  font-size: 0.82rem;
}

.qm-assignment-state {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  align-items: center;
  justify-content: flex-end;
}

.qm-assignment-state code {
  border: 1px solid var(--sq-border);
  border-radius: 4px;
  background: var(--sq-soft);
  color: var(--sq-text);
  font-size: 0.86rem;
  font-variant-numeric: tabular-nums;
}

.qm-status {
  padding: 0.16rem 0.5rem;
  border: 1px solid var(--sq-border);
  border-radius: 999px;
  background: var(--sq-soft);
  color: var(--sq-muted);
  font-size: 0.76rem;
  font-weight: 600;
}

.qm-status.is-optimal {
  border-color: rgba(95, 127, 103, 0.35);
  background: var(--sq-warm);
  color: var(--sq-accent-dark);
}

.qm-bits {
  display: grid;
  grid-template-columns: repeat(8, minmax(54px, 1fr));
  gap: 0.5rem;
}

.qm-bit {
  display: flex;
  min-width: 0;
  min-height: 3rem;
  align-items: center;
  justify-content: space-between;
  gap: 0.35rem;
  padding: 0.45rem 0.65rem;
  border: 1px solid #8b9aa5;
  border-radius: 4px;
  background: #e5eaed;
  color: #314451;
  transition: border-color 120ms ease, background-color 120ms ease;
}

.qm-bit.is-one {
  border-color: var(--sq-accent-dark);
  background: var(--sq-accent);
  color: #ffffff;
}

.qm-bit:hover {
  border-color: var(--sq-accent-dark);
}

.qm-bit strong {
  color: inherit;
  font-size: 1.05rem;
}

.qm-breakdown {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.qm-breakdown > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
  min-width: 0;
  padding: 0.45rem 0.65rem;
  border-top: 1px solid var(--sq-border);
}

.qm-breakdown span {
  color: var(--sq-muted);
  font-size: 0.78rem;
}

.qm-breakdown strong {
  font-size: 0.92rem;
  font-variant-numeric: tabular-nums;
}

.qm-visual-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  border-bottom: 1px solid var(--sq-border);
}

.qm-visual-grid .qm-section {
  border-bottom: 0;
}

.qm-visual-grid .qm-section + .qm-section {
  border-left: 1px solid var(--sq-border);
}

.qm-graph {
  display: block;
  width: 100%;
  aspect-ratio: 640 / 380;
  max-height: 340px;
  border: 1px solid var(--sq-border);
  border-radius: 4px;
  background: var(--sq-soft);
}

.qm-edge {
  stroke: var(--sq-graph-edge);
  stroke-width: var(--edge-width, 2);
}

.qm-edge.is-active {
  stroke: var(--sq-accent);
}

.qm-edge.is-negative {
  stroke-dasharray: 7 5;
}

.qm-edge-label,
.qm-linear-label,
.qm-node text {
  fill: var(--sq-text);
  font-family: "Open Sans", Arial, sans-serif;
  text-anchor: middle;
}

.qm-edge-label {
  paint-order: stroke;
  stroke: var(--sq-soft);
  stroke-width: 5px;
  font-size: 15px;
}

.qm-node {
  cursor: pointer;
}

.qm-node circle {
  fill: var(--sq-surface);
  stroke: var(--sq-chart-selected);
  stroke-width: 2px;
}

.qm-node.is-one circle {
  fill: var(--sq-chart-selected);
}

.qm-node.is-one text:not(.qm-linear-label) {
  fill: #ffffff;
}

.qm-node:focus-visible circle {
  stroke: var(--sq-accent-dark);
  stroke-width: 5px;
}

.qm-node text {
  pointer-events: none;
  font-size: 15px;
}

.qm-node .qm-node-value {
  font-size: 18px;
  font-weight: 600;
}

.qm-node .qm-linear-label {
  font-size: 13px;
}

.qm-empty-note,
.qm-chart-detail,
.qm-error {
  min-height: 1.45em;
  margin: 0.55rem 0 0;
  color: var(--sq-muted);
  font-size: 0.85rem;
}

.qm-graph-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 0.85rem;
  margin-top: 0.55rem;
  color: var(--sq-muted);
  font-size: 0.76rem;
}

.qm-graph-legend span {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.qm-node-key {
  display: inline-flex;
  width: 1.2rem;
  height: 1.2rem;
  align-items: center;
  justify-content: center;
  border: 1px solid #6f8190;
  border-radius: 50%;
  background: #e5eaed;
  color: #314451;
  font-size: 0.68rem;
  font-style: normal;
  font-weight: 600;
}

.qm-node-key.is-one {
  border-color: var(--sq-accent-dark);
  background: var(--sq-accent);
  color: #ffffff;
}

.qm-line-key {
  width: 1.5rem;
  height: 0;
  border-top: 3px solid var(--sq-accent-dark);
}

.qm-line-key.is-negative {
  border-top: 2px dashed #66746b;
}

.qm-chart {
  display: block;
  width: 100%;
  min-width: 0;
  max-width: 100%;
  height: 250px;
  border: 1px solid var(--sq-border);
  border-radius: 4px;
  background: var(--sq-surface);
  cursor: pointer;
}

.qm-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 0.9rem;
  margin-top: 0.5rem;
  color: var(--sq-muted);
  font-size: 0.78rem;
}

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

.qm-key {
  width: 0.8rem;
  height: 0.8rem;
  border-radius: 2px;
  background: var(--sq-chart-neutral);
}

.qm-key-selected {
  border: 2px solid var(--sq-chart-selected);
  background: transparent;
}

.qm-key-optimum {
  background: var(--sq-accent);
}

.qm-best-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.5rem;
}

.qm-solution {
  display: grid;
  grid-template-columns: 1.6rem 1fr auto;
  gap: 0.5rem;
  min-width: 0;
  align-items: center;
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--sq-border);
  border-radius: 4px;
  background: var(--sq-surface);
  color: var(--sq-text);
  text-align: left;
}

.qm-solution:hover {
  border-color: var(--sq-accent);
  background: var(--sq-soft);
}

.qm-solution.is-selected {
  border-color: var(--sq-chart-selected);
  background: rgba(80, 118, 155, 0.08);
}

.qm-solution code,
.qm-solution strong {
  font-variant-numeric: tabular-nums;
}

.qm-solution code {
  justify-self: start;
  background: transparent;
  color: var(--sq-text);
  font-size: 0.84rem;
}

.qm-solution-rank {
  color: var(--sq-muted);
  font-size: 0.76rem;
  text-align: center;
}

.qm-editor {
  border-top: 0;
  background: var(--sq-surface);
}

.qm-editor summary {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  align-items: baseline;
  justify-content: space-between;
  padding: 0.9rem 1rem;
  cursor: pointer;
  list-style-position: inside;
}

.qm-editor summary::-webkit-details-marker {
  display: none;
}

.qm-editor summary::after {
  content: "+";
  color: var(--sq-accent-dark);
  font-size: 1.15rem;
  line-height: 1;
}

.qm-editor[open] summary::after {
  content: "-";
}

.qm-editor summary:hover {
  background: var(--sq-soft);
}

.qm-editor summary:focus-visible {
  outline: 3px solid rgba(95, 127, 103, 0.38);
  outline-offset: -3px;
}

.qm-editor-title {
  color: var(--sq-text);
  font-family: "Josefin Sans", Arial, sans-serif;
  font-size: 1.1rem;
  font-weight: 400;
}

.qm-editor-body {
  padding: 0 1rem 1rem;
}

.qm-table-wrap {
  max-width: 100%;
  overflow-x: auto;
}

.qm-matrix {
  width: auto;
  min-width: 100%;
  margin: 0;
  border-collapse: collapse;
}

.qm-matrix th,
.qm-matrix td {
  min-width: 5.25rem;
  padding: 0.35rem;
  border: 1px solid var(--sq-border);
  text-align: center;
}

.qm-matrix th {
  position: sticky;
  top: 0;
  background: var(--sq-soft);
  font-weight: 600;
  z-index: 1;
}

.qm-matrix input {
  width: 4.35rem;
  min-height: 2.25rem;
  border: 1px solid var(--sq-border);
  border-radius: 3px;
  background: var(--sq-surface);
  color: var(--sq-text);
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.qm-matrix input[aria-invalid="true"] {
  border-color: #8a5b37;
  outline: 2px solid rgba(138, 91, 55, 0.2);
}

.qm-disabled {
  color: var(--sq-border);
  background: var(--sq-soft);
}

.qm-error {
  color: #6f4729;
}

@media (max-width: 900px) {
  .qm-toolbar {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .qm-visual-grid {
    grid-template-columns: 1fr;
  }

  .qm-visual-grid .qm-section + .qm-section {
    border-top: 1px solid var(--sq-border);
    border-left: 0;
  }

  .qm-bits {
    grid-template-columns: repeat(4, minmax(54px, 1fr));
  }

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

  .qm-summary > div:nth-child(3) {
    border-top: 1px solid var(--sq-border);
    border-left: 0;
  }

  .qm-summary > div:nth-child(4) {
    border-top: 1px solid var(--sq-border);
  }
}

@media (max-width: 620px) {
  .qm-toolbar,
  .qm-best-list {
    grid-template-columns: 1fr;
  }

  .qm-assignment-state {
    width: 100%;
    justify-content: flex-start;
  }

  .qm-optimum {
    width: 100%;
  }

  .qm-bits {
    grid-template-columns: repeat(2, minmax(54px, 1fr));
  }

  .qm-breakdown {
    grid-template-columns: 1fr;
  }

  .qm-graph {
    min-height: 250px;
  }
}
/* Select controls inside the app control grid. */
.sb-control select {
  width: 100%;
  padding: 0.35rem 0.5rem;
  font: inherit;
  font-size: 0.92rem;
  color: inherit;
  background: var(--sq-surface);
  border: 1px solid var(--sq-border);
  border-radius: 6px;
}

.sb-control select:focus-visible {
  outline: 3px solid rgba(95, 127, 103, 0.38);
  outline-offset: 2px;
}

/* The 2D app has six controls rather than three. */
#b2-app .sb-controls {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

@media (max-width: 900px) {
  #b2-app .sb-controls {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 700px) {
  #b2-app .sb-controls {
    grid-template-columns: 1fr;
  }
}

/* --- QRAO decoder-consistency explorer ----------------------------- */

.qd-app {
  --qd-blue: #50769b;
  --qd-blue-soft: #e8eff5;
  --qd-green: #58765f;
  --qd-green-soft: #e9f0ea;
  --qd-gold: #81683f;
  --qd-gold-soft: #f4efe5;
  --qd-warm: #98624e;
  --qd-warm-soft: #f5ece8;
  margin: 1.5rem 0 2.5rem;
  overflow: hidden;
  border: 1px solid var(--sq-border);
  border-top: 3px solid var(--sq-accent);
  border-radius: var(--sq-radius);
  background: var(--sq-surface);
  box-shadow: var(--sq-shadow);
}

.qd-toolbar {
  display: grid;
  grid-template-columns: minmax(210px, 1fr) minmax(180px, 0.8fr) auto;
  gap: 0.85rem;
  align-items: end;
  padding: 1rem;
  border-bottom: 1px solid var(--sq-border);
  background: var(--sq-soft);
}

.qd-control {
  display: block;
  margin: 0;
}

.qd-control > span,
.qd-constant-control > span {
  display: block;
  margin-bottom: 0.3rem;
  color: var(--sq-muted);
  font-size: 0.78rem;
  font-weight: 600;
}

.qd-control select,
.qd-constant-control input {
  width: 100%;
  min-height: 2.45rem;
  border: 1px solid var(--sq-border);
  border-radius: 4px;
  background: var(--sq-surface);
  color: var(--sq-text);
}

.qd-reset {
  min-height: 2.45rem;
  white-space: nowrap;
}

.qd-summary {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border-bottom: 1px solid var(--sq-border);
}

.qd-summary > div {
  display: flex;
  min-width: 0;
  flex-direction: column;
  gap: 0.12rem;
  padding: 0.8rem 1rem 0.9rem;
}

.qd-summary > div + div {
  border-left: 1px solid var(--sq-border);
}

.qd-summary span {
  color: var(--sq-muted);
  font-size: 0.8rem;
}

.qd-summary strong {
  overflow-wrap: anywhere;
  font-size: 1.08rem;
  line-height: 1.3;
  font-variant-numeric: tabular-nums;
}

.qd-relation.is-affine {
  color: var(--qd-green);
}

.qd-relation.is-non-affine {
  color: var(--qd-blue);
}

.qd-relation.is-coloring {
  color: var(--qd-warm);
}

.qd-visual-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  border-bottom: 1px solid var(--sq-border);
}

.qd-section {
  min-width: 0;
  padding: 1rem;
}

.qd-visual-grid .qd-section + .qd-section {
  border-left: 1px solid var(--sq-border);
}

.qd-section h2 {
  margin: 0;
  padding: 0;
  border: 0;
  font-size: 1.15rem;
  line-height: 1.3;
}

.qd-section-heading {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 0.75rem;
}

.qd-section-heading > span {
  color: var(--sq-muted);
  font-size: 0.78rem;
}

.qd-objective {
  min-height: 2.5rem;
  margin-bottom: 0.6rem;
  padding: 0.45rem 0.6rem;
  overflow-wrap: anywhere;
  border: 1px solid var(--sq-border);
  border-radius: 4px;
  background: var(--sq-soft);
  font-size: 0.82rem;
  line-height: 1.45;
}

.qd-objective > span {
  color: var(--sq-muted);
}

.qd-objective code {
  background: transparent;
  color: var(--sq-text);
  font-size: inherit;
  white-space: normal;
}

.qd-graph-wrap {
  max-width: 100%;
  overflow-x: auto;
}

.qd-graph {
  display: block;
  width: 100%;
  min-width: 600px;
  aspect-ratio: 720 / 380;
  max-height: 360px;
  border: 1px solid var(--sq-border);
  border-radius: 4px;
  background: #fbfbfb;
}

.qd-block-panel {
  fill: #f5f6f5;
  stroke: #cfd5d0;
  stroke-width: 1.5px;
}

.qd-block-label,
.qd-edge-label,
.qd-node text {
  fill: var(--sq-text);
  font-family: "Open Sans", Arial, sans-serif;
  letter-spacing: 0;
}

.qd-block-label {
  font-size: 15px;
  font-weight: 600;
}

.qd-edge {
  fill: none;
  stroke-width: var(--qd-edge-width, 2px);
}

.qd-edge-inter {
  stroke: var(--qd-green);
}

.qd-edge-intra {
  stroke: var(--qd-warm);
  stroke-dasharray: 7 5;
}

.qd-edge-label {
  paint-order: stroke;
  stroke: #fbfbfb;
  stroke-width: 5px;
  font-size: 13px;
  font-weight: 600;
  text-anchor: middle;
}

.qd-node circle {
  stroke-width: 2px;
}

.qd-node.qd-axis-x circle {
  fill: var(--qd-blue);
  stroke: #365b7b;
}

.qd-node.qd-axis-y circle {
  fill: var(--qd-green);
  stroke: #3f5f45;
}

.qd-node.qd-axis-z circle {
  fill: var(--qd-gold);
  stroke: #70572f;
}

.qd-node-variable,
.qd-node-axis {
  fill: #ffffff !important;
  text-anchor: middle;
}

.qd-node-variable {
  font-size: 15px;
  font-weight: 600;
}

.qd-node-axis {
  font-size: 13px;
}

.qd-node-block {
  font-size: 9px;
  baseline-shift: sub;
}

.qd-node-linear {
  paint-order: stroke;
  stroke: #f5f6f5;
  stroke-width: 4px;
  font-size: 12px;
  text-anchor: middle;
}

.qd-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 0.8rem;
  margin-top: 0.55rem;
  color: var(--sq-muted);
  font-size: 0.74rem;
}

.qd-legend span {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.qd-axis-key {
  display: inline-flex;
  width: 1.25rem;
  height: 1.25rem;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  color: #ffffff;
  font-size: 0.66rem;
  font-style: normal;
  font-weight: 700;
}

.qd-axis-key.qd-axis-x {
  background: var(--qd-blue);
}

.qd-axis-key.qd-axis-y {
  background: var(--qd-green);
}

.qd-axis-key.qd-axis-z {
  background: var(--qd-gold);
}

.qd-line-key {
  width: 1.6rem;
  height: 0;
  border-top: 3px solid var(--qd-green);
}

.qd-line-key.qd-line-intra {
  border-top: 2px dashed var(--qd-warm);
}

.qd-note,
.qd-probability,
.qd-error {
  min-height: 1.35em;
  margin: 0.45rem 0 0;
  color: var(--sq-muted);
  font-size: 0.78rem;
}

.qd-probe-controls {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.65rem;
}

.qd-probe-block {
  min-width: 0;
  margin: 0;
  padding: 0.55rem 0.65rem 0.65rem;
  border: 1px solid var(--sq-border);
  border-radius: 4px;
}

.qd-probe-block legend {
  float: none;
  width: auto;
  margin: 0;
  padding: 0 0.3rem;
  font-size: 0.8rem;
  font-weight: 600;
}

.qd-probe-block label {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 0.1rem 0.5rem;
  align-items: center;
  margin: 0 0 0.35rem;
  color: var(--sq-muted);
  font-size: 0.72rem;
}

.qd-probe-block label:last-child {
  margin-bottom: 0;
}

.qd-probe-block output {
  color: var(--sq-text);
  font-variant-numeric: tabular-nums;
}

.qd-probe-block input[type="range"] {
  grid-column: 1 / -1;
  width: 100%;
  accent-color: var(--qd-green);
}

.qd-vectors {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.35rem;
  margin-top: 0.65rem;
}

.qd-vectors code {
  min-width: 0;
  padding: 0.35rem 0.45rem;
  overflow-wrap: anywhere;
  border: 1px solid var(--sq-border);
  border-radius: 4px;
  background: var(--sq-soft);
  color: var(--sq-text);
  font-size: 0.7rem;
  font-variant-numeric: tabular-nums;
  white-space: normal;
}

.qd-probe-values {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: 0.65rem;
  border: 1px solid var(--sq-border);
  border-radius: 4px;
}

.qd-probe-values > div {
  display: flex;
  min-width: 0;
  flex-direction: column;
  gap: 0.08rem;
  padding: 0.5rem;
}

.qd-probe-values > div + div {
  border-left: 1px solid var(--sq-border);
}

.qd-probe-values span {
  color: var(--sq-muted);
  font-size: 0.67rem;
}

.qd-probe-values strong {
  overflow-wrap: anywhere;
  font-size: 0.84rem;
  font-variant-numeric: tabular-nums;
}

.qd-value-chart {
  display: grid;
  gap: 0.35rem;
  min-height: 8.1rem;
  margin-top: 0.65rem;
  padding: 0.55rem;
  border: 1px solid var(--sq-border);
  border-radius: 4px;
  background: var(--sq-soft);
}

.qd-chart-row {
  display: grid;
  grid-template-columns: minmax(92px, 0.9fr) minmax(120px, 1.5fr) minmax(58px, auto);
  gap: 0.5rem;
  align-items: center;
  min-height: 2rem;
  font-size: 0.72rem;
}

.qd-chart-row > span {
  color: var(--sq-muted);
}

.qd-chart-row > strong {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.qd-chart-track {
  position: relative;
  height: 1.1rem;
  border: 1px solid var(--sq-border);
  background: var(--sq-surface);
}

.qd-chart-track::after {
  position: absolute;
  top: -1px;
  bottom: -1px;
  left: 50%;
  width: 1px;
  background: #8f9690;
  content: "";
}

.qd-chart-track i {
  position: absolute;
  top: 2px;
  bottom: 2px;
  z-index: 1;
}

.qd-chart-track i.is-decoded {
  background: var(--qd-blue);
}

.qd-chart-track i.is-consistent {
  background: var(--qd-green);
}

.qd-chart-track i.is-standard {
  background: var(--qd-gold);
}

.qd-chart-row.is-unavailable {
  color: var(--sq-muted);
}

.qd-identity-note {
  min-height: 1.4em;
  margin: 0.5rem 0 0;
  font-size: 0.78rem;
}

.qd-identity-note.is-valid {
  color: var(--sq-accent-dark);
}

.qd-identity-note.is-invalid {
  color: var(--qd-warm);
}

.qd-coefficients {
  border-bottom: 1px solid var(--sq-border);
}

.qd-status-note {
  margin: 0 0 0.75rem;
  padding: 0.55rem 0.7rem;
  border-left: 3px solid var(--qd-green);
  background: var(--qd-green-soft);
  color: #354e3a;
  font-size: 0.82rem;
}

.qd-status-note.is-non-affine {
  border-left-color: var(--qd-blue);
  background: var(--qd-blue-soft);
  color: #304d66;
}

.qd-status-note.is-coloring {
  border-left-color: var(--qd-warm);
  background: var(--qd-warm-soft);
  color: #684333;
}

.qd-status-note.is-trivial {
  border-left-color: var(--sq-border);
  background: var(--sq-soft);
  color: var(--sq-muted);
}

.qd-table-wrap {
  max-width: 100%;
  overflow-x: auto;
}

.qd-term-table {
  width: 100%;
  min-width: 790px;
  margin: 0;
  border-collapse: collapse;
  font-size: 0.78rem;
}

.qd-term-table th,
.qd-term-table td {
  padding: 0.5rem 0.55rem;
  border: 1px solid var(--sq-border);
  vertical-align: middle;
}

.qd-term-table th {
  background: var(--sq-soft);
  font-weight: 600;
  text-align: left;
}

.qd-term-table code {
  background: transparent;
  color: var(--sq-text);
  font-size: 0.75rem;
  white-space: nowrap;
}

.qd-class {
  display: inline-block;
  padding: 0.14rem 0.38rem;
  border: 1px solid var(--sq-border);
  border-radius: 4px;
  background: var(--sq-soft);
  white-space: nowrap;
}

.qd-class.is-one-body {
  border-color: #b9cad8;
  background: var(--qd-blue-soft);
  color: #304d66;
}

.qd-class.is-inter {
  border-color: #bfd0c1;
  background: var(--qd-green-soft);
  color: #354e3a;
}

.qd-class.is-intra {
  border-color: #d9c1b7;
  background: var(--qd-warm-soft);
  color: #684333;
}

.qd-empty-cell {
  color: var(--sq-muted);
  text-align: center;
}

.qd-editor {
  background: var(--sq-surface);
}

.qd-editor summary {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 1rem;
  align-items: baseline;
  justify-content: space-between;
  padding: 0.9rem 1rem;
  cursor: pointer;
}

.qd-editor summary::-webkit-details-marker {
  display: none;
}

.qd-editor summary::after {
  color: var(--sq-accent-dark);
  content: "+";
  font-size: 1.15rem;
}

.qd-editor[open] summary::after {
  content: "-";
}

.qd-editor summary > span {
  color: var(--sq-text);
  font-family: "Josefin Sans", Arial, sans-serif;
  font-size: 1.1rem;
}

.qd-editor summary > small {
  margin-left: auto;
  color: var(--sq-muted);
  font-size: 0.75rem;
}

.qd-editor summary:focus-visible {
  outline: 3px solid rgba(95, 127, 103, 0.38);
  outline-offset: -3px;
}

.qd-editor-body {
  padding: 0 1rem 1rem;
}

.qd-constant-control {
  display: block;
  width: min(12rem, 100%);
  margin-bottom: 0.8rem;
}

.qd-editor-group {
  margin: 0 0 0.8rem;
  padding: 0.7rem;
  border: 1px solid var(--sq-border);
  border-radius: 4px;
}

.qd-editor-group legend {
  float: none;
  width: auto;
  margin: 0;
  padding: 0 0.35rem;
  font-size: 0.84rem;
  font-weight: 600;
}

.qd-linear-inputs,
.qd-pair-inputs {
  display: grid;
  gap: 0.45rem;
}

.qd-linear-inputs {
  grid-template-columns: repeat(6, minmax(84px, 1fr));
}

.qd-pair-inputs {
  grid-template-columns: repeat(5, minmax(92px, 1fr));
}

.qd-linear-inputs label,
.qd-pair-inputs label {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.35rem;
  align-items: center;
  margin: 0;
  color: var(--sq-muted);
  font-size: 0.75rem;
}

.qd-linear-inputs input,
.qd-pair-inputs input {
  width: 100%;
  min-width: 0;
  min-height: 2.15rem;
  border: 1px solid var(--sq-border);
  border-radius: 3px;
  background: var(--sq-surface);
  color: var(--sq-text);
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.qd-linear-inputs input[aria-invalid="true"],
.qd-pair-inputs input[aria-invalid="true"],
.qd-constant-control input[aria-invalid="true"] {
  border-color: var(--qd-warm);
  outline: 2px solid rgba(152, 98, 78, 0.2);
}

.qd-error {
  color: #684333;
}

@media (max-width: 980px) {
  .qd-visual-grid {
    grid-template-columns: 1fr;
  }

  .qd-visual-grid .qd-section + .qd-section {
    border-top: 1px solid var(--sq-border);
    border-left: 0;
  }

  .qd-linear-inputs {
    grid-template-columns: repeat(3, minmax(84px, 1fr));
  }

  .qd-pair-inputs {
    grid-template-columns: repeat(3, minmax(92px, 1fr));
  }
}

@media (max-width: 700px) {
  .qd-toolbar {
    grid-template-columns: 1fr;
  }

  .qd-reset {
    width: 100%;
  }

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

  .qd-summary > div:nth-child(3) {
    border-top: 1px solid var(--sq-border);
    border-left: 0;
  }

  .qd-summary > div:nth-child(4) {
    border-top: 1px solid var(--sq-border);
  }

  .qd-probe-controls,
  .qd-vectors {
    grid-template-columns: 1fr;
  }

  .qd-probe-values {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .qd-probe-values > div:nth-child(3) {
    border-top: 1px solid var(--sq-border);
    border-left: 0;
  }

  .qd-probe-values > div:nth-child(4) {
    border-top: 1px solid var(--sq-border);
  }

  .qd-chart-row {
    grid-template-columns: minmax(90px, 1fr) minmax(100px, 1.4fr);
  }

  .qd-chart-row > strong {
    grid-column: 1 / -1;
    min-height: 1em;
  }

  .qd-linear-inputs,
  .qd-pair-inputs {
    grid-template-columns: repeat(2, minmax(84px, 1fr));
  }
}

@media (max-width: 430px) {
  .qd-linear-inputs,
  .qd-pair-inputs {
    grid-template-columns: 1fr;
  }
}

/* QRAC state and measurement explorer */
.qr-app {
  --qr-blue: #50769b;
  --qr-blue-soft: #edf3f8;
  --qr-warm: #a36149;
  --qr-warm-soft: #f7eee9;
  --qr-ink-soft: #40505c;
  margin: 1.5rem 0 2.5rem;
  overflow: hidden;
  border: 1px solid var(--sq-border);
  border-top: 4px solid var(--sq-accent);
  border-radius: 8px;
  background: var(--sq-surface);
  box-shadow: var(--sq-shadow);
  color: var(--sq-text);
  font-variant-numeric: tabular-nums;
}

.qr-app button {
  min-width: 0;
  border: 1px solid var(--sq-border);
  background: var(--sq-surface);
  color: var(--sq-text);
  font: inherit;
  cursor: pointer;
}

.qr-app button:hover {
  border-color: var(--sq-accent);
  background: var(--sq-soft);
}

.qr-app button[aria-pressed="true"] {
  border-color: #314f38;
  background: var(--sq-accent-dark);
  color: #ffffff;
}

.qr-toolbar {
  display: grid;
  grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
  gap: 1rem;
  padding: 1rem;
  border-bottom: 1px solid var(--sq-border);
  background: var(--sq-soft);
}

.qr-control-group {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.qr-control-group legend {
  float: none;
  width: auto;
  margin: 0 0 0.38rem;
  padding: 0;
  color: var(--sq-muted);
  font-size: 0.77rem;
  font-weight: 650;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.qr-segments {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(0, 1fr);
}

.qr-segments button {
  min-height: 2.65rem;
  padding: 0.48rem 0.55rem;
  border-radius: 0;
  font-size: 0.88rem;
  font-weight: 650;
  line-height: 1.2;
}

.qr-segments button + button {
  margin-left: -1px;
}

.qr-segments button:first-child {
  border-radius: 5px 0 0 5px;
}

.qr-segments button:last-child {
  border-radius: 0 5px 5px 0;
}

.qr-state-picker {
  padding: 0.9rem 1rem 1rem;
  border-bottom: 1px solid var(--sq-border);
}

.qr-section-heading,
.qr-subheading {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 0.8rem;
  align-items: baseline;
  justify-content: space-between;
}

.qr-section-heading h2,
.qr-subheading h3,
.qr-correlation-wrap h3 {
  margin: 0;
  padding: 0;
  border: 0;
  line-height: 1.25;
}

.qr-section-heading h2 {
  font-size: 1.12rem;
  font-weight: 500;
}

.qr-section-heading > span,
.qr-subheading > span {
  color: var(--sq-muted);
  font-size: 0.73rem;
  line-height: 1.4;
  text-align: right;
}

.qr-section-heading > code {
  padding: 0.12rem 0.42rem;
  border-radius: 3px;
  background: var(--sq-warm);
  color: var(--sq-accent-dark);
  font-size: 0.84rem;
}

.qr-state-buttons {
  display: grid;
  grid-template-columns: repeat(8, minmax(0, 1fr));
  gap: 0.35rem;
  margin-top: 0.7rem;
}

.qr-state-buttons button {
  min-height: 2.3rem;
  padding: 0.35rem 0.2rem;
  border-radius: 4px;
}

.qr-state-buttons code,
.qr-state-buttons button[aria-pressed="true"] code {
  background: transparent;
  color: inherit;
  font-size: 0.78rem;
}

.qr-main-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
}

.qr-panel {
  min-width: 0;
  padding: 1rem;
}

.qr-visual-panel {
  border-right: 1px solid var(--sq-border);
  background: linear-gradient(180deg, #ffffff, #fafbfa);
}

.qr-state-formula {
  display: flex;
  flex-wrap: wrap;
  gap: 0.28rem 0.6rem;
  align-items: baseline;
  min-height: 2.2rem;
  margin: 0.75rem 0 0.35rem;
  padding: 0.5rem 0.65rem;
  border-left: 3px solid var(--sq-accent);
  background: var(--sq-soft);
  line-height: 1.4;
}

.qr-state-formula span {
  color: var(--sq-muted);
  font-size: 0.72rem;
}

.qr-state-formula code {
  background: transparent;
  color: var(--qr-ink-soft);
  font-size: 0.78rem;
  white-space: normal;
}

.qr-state-formula strong {
  color: var(--sq-accent-dark);
  font-size: 0.75rem;
  font-weight: 650;
}

.qr-visual {
  min-height: 370px;
}

.qr-bloch,
.qr-mini-bloch {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}

.qr-bloch {
  max-height: 430px;
}

.qr-sphere-fill {
  fill: rgba(80, 118, 155, 0.035);
  stroke: #b8c2ca;
  stroke-width: 1.2;
}

.qr-sphere-grid {
  fill: none;
  stroke: #dce2e6;
  stroke-width: 1;
}

.qr-sphere-axis {
  stroke: #aab4bb;
  stroke-width: 1.1;
}

.qr-sphere-axis.is-active {
  stroke: var(--qr-warm);
  stroke-width: 3.2;
}

.qr-sphere-axis-label {
  fill: var(--sq-muted);
  font-family: "Open Sans", Arial, sans-serif;
  font-size: 13px;
  font-weight: 650;
  text-anchor: middle;
  dominant-baseline: middle;
}

.qr-sphere-axis-label.is-active {
  fill: var(--qr-warm);
}

.qr-povm-ray {
  stroke: var(--qr-blue);
  stroke-width: 1.25;
  stroke-dasharray: 3 4;
  opacity: 0.42;
}

.qr-state-arrow {
  stroke: var(--sq-accent-dark);
  stroke-width: 3.4;
  stroke-linecap: round;
}

.qr-state-point circle {
  fill: var(--qr-blue);
  stroke: #ffffff;
  stroke-width: 2;
}

.qr-state-point.is-selected circle {
  fill: var(--qr-warm);
  stroke: #ffffff;
  stroke-width: 3;
}

.qr-selected-label {
  fill: var(--qr-warm);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 14px;
  font-weight: 700;
}

.qr-visual-note {
  min-height: 2.7rem;
  margin: 0.2rem 0 0;
  color: var(--sq-muted);
  font-size: 0.77rem;
  line-height: 1.55;
}

.qr-target {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.8rem;
  align-items: center;
  margin: 0.8rem 0;
}

.qr-target > span {
  color: var(--sq-muted);
  font-size: 0.77rem;
  font-weight: 650;
}

.qr-target-buttons {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.qr-target-buttons button {
  display: flex;
  gap: 0.35rem;
  align-items: baseline;
  justify-content: center;
  min-height: 2.5rem;
  padding: 0.35rem;
  border-radius: 0;
}

.qr-target-buttons button + button {
  margin-left: -1px;
}

.qr-target-buttons button:first-child {
  border-radius: 4px 0 0 4px;
}

.qr-target-buttons button:last-child {
  border-radius: 0 4px 4px 0;
}

.qr-target-buttons small {
  color: inherit;
  font-size: 0.68rem;
  opacity: 0.78;
}

.qr-primary-result {
  margin: 0.75rem 0 1rem;
  padding: 0.85rem 0.9rem;
  border: 1px solid #c7d5ca;
  border-left: 4px solid var(--sq-accent);
  border-radius: 4px;
  background: var(--sq-warm);
}

.qr-primary-result > span {
  display: block;
  color: var(--sq-muted);
  font-size: 0.75rem;
  line-height: 1.45;
}

.qr-primary-result > strong {
  display: block;
  margin: 0.08rem 0 0.15rem;
  color: var(--sq-accent-dark);
  font-family: "Josefin Sans", Arial, sans-serif;
  font-size: clamp(1.7rem, 4vw, 2.2rem);
  font-weight: 500;
  line-height: 1.15;
}

.qr-primary-result > div {
  display: flex;
  gap: 0.65rem;
  align-items: baseline;
  color: var(--sq-muted);
  font-size: 0.75rem;
}

.qr-primary-result code {
  background: transparent;
  color: var(--sq-text);
  font-size: 0.82rem;
}

.qr-primary-result > .qr-mode-comparison {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.35rem;
  margin-top: 0.65rem;
}

.qr-mode-comparison > span {
  display: flex;
  flex-wrap: wrap;
  gap: 0.15rem 0.45rem;
  align-items: baseline;
  justify-content: space-between;
  padding: 0.38rem 0.5rem;
  border: 1px solid var(--sq-border);
  border-radius: 3px;
  background: var(--sq-surface);
  color: var(--sq-muted);
}

.qr-mode-comparison > span.is-selected {
  border-color: var(--sq-accent);
  box-shadow: inset 3px 0 var(--sq-accent);
  color: var(--sq-text);
}

.qr-mode-comparison small {
  font-size: 0.64rem;
}

.qr-mode-comparison strong {
  font-size: 0.78rem;
  font-weight: 700;
}

.qr-subheading {
  margin-bottom: 0.55rem;
}

.qr-subheading h3,
.qr-correlation-wrap h3 {
  font-size: 0.93rem;
  font-weight: 500;
}

.qr-signal-section,
.qr-outcome-section {
  margin-top: 1rem;
}

.qr-signal-list,
.qr-outcome-list {
  display: grid;
  gap: 0.36rem;
}

.qr-signal-row {
  display: grid;
  grid-template-columns: minmax(62px, 0.65fr) minmax(80px, 1.25fr) minmax(120px, 1fr);
  gap: 0.55rem;
  align-items: center;
  min-height: 2rem;
}

.qr-signal-row:not(.is-active) .qr-signal-track {
  opacity: 0.38;
}

.qr-signal-row code,
.qr-outcome-row code {
  overflow: hidden;
  background: transparent;
  color: var(--sq-text);
  font-size: 0.75rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.qr-signal-row strong,
.qr-outcome-row strong {
  color: var(--sq-muted);
  font-size: 0.7rem;
  font-weight: 600;
  text-align: right;
  white-space: nowrap;
}

.qr-signal-track,
.qr-outcome-track {
  height: 0.48rem;
  overflow: hidden;
  border-radius: 999px;
  background: #e5e8e6;
}

.qr-signal-track i,
.qr-outcome-track i {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: var(--qr-blue);
}

.qr-scale {
  display: flex;
  justify-content: space-between;
  margin: 0.18rem 0 0 4.6rem;
  color: var(--sq-muted);
  font-size: 0.62rem;
}

.qr-outcome-list {
  max-height: 240px;
  overflow-y: auto;
  padding-right: 0.2rem;
}

.qr-outcome-row {
  display: grid;
  grid-template-columns: minmax(52px, 0.55fr) minmax(80px, 1.35fr) minmax(86px, auto);
  gap: 0.55rem;
  align-items: center;
  min-height: 1.5rem;
}

.qr-outcome-row.is-correct code,
.qr-outcome-row.is-correct strong {
  color: var(--sq-accent-dark);
  font-weight: 700;
}

.qr-outcome-row.is-correct .qr-outcome-track i {
  background: var(--sq-accent);
}

.qr-two-qubit-visual {
  display: grid;
  gap: 0.8rem;
  padding-top: 0.35rem;
}

.qr-local-spheres {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.45rem;
}

.qr-mini-title,
.qr-mini-axis-label,
.qr-mini-value {
  fill: var(--sq-muted);
  font-family: "Open Sans", Arial, sans-serif;
  font-size: 11px;
  text-anchor: middle;
}

.qr-mini-axis-label {
  font-size: 9px;
  font-weight: 650;
  dominant-baseline: middle;
}

.qr-mini-title {
  fill: var(--sq-text);
  font-size: 12px;
  font-weight: 650;
}

.qr-correlation-wrap {
  width: min(340px, 100%);
  margin: 0 auto;
}

.qr-correlation-table {
  width: 100%;
  margin: 0;
  border-collapse: separate;
  border-spacing: 0.22rem;
  table-layout: fixed;
}

.qr-correlation-table caption {
  caption-side: top;
  padding: 0 0 0.35rem;
  color: var(--sq-text);
  text-align: center;
}

.qr-correlation-table caption strong,
.qr-correlation-table caption span {
  display: block;
}

.qr-correlation-table caption strong {
  font-family: "Josefin Sans", Arial, sans-serif;
  font-size: 0.93rem;
  font-weight: 500;
}

.qr-correlation-table caption span {
  color: var(--sq-muted);
  font-size: 0.65rem;
}

.qr-correlation-table th,
.qr-correlation-table td {
  padding: 0.3rem;
  border: 0;
  text-align: center;
}

.qr-correlation-table th {
  width: 1.3rem;
  background: transparent;
  color: var(--sq-muted);
  font-size: 0.66rem;
  font-weight: 650;
}

.qr-corr-cell {
  min-height: 2rem;
  border: 1px solid rgba(0, 0, 0, 0.05) !important;
  border-radius: 3px;
  color: var(--sq-text);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.69rem;
}

.qr-corr-cell.is-positive {
  background: rgba(80, 118, 155, calc(0.08 + var(--qr-strength) * 0.38));
}

.qr-corr-cell.is-negative {
  background: rgba(163, 97, 73, calc(0.08 + var(--qr-strength) * 0.38));
}

.qr-corr-cell.is-zero {
  background: var(--sq-soft);
  color: var(--sq-muted);
}

@media (max-width: 900px) {
  .qr-main-grid {
    grid-template-columns: 1fr;
  }

  .qr-visual-panel {
    border-right: 0;
    border-bottom: 1px solid var(--sq-border);
  }

  .qr-visual {
    min-height: 0;
  }

  .qr-bloch {
    max-height: 390px;
  }
}

@media (max-width: 620px) {
  .qr-toolbar {
    grid-template-columns: 1fr;
    gap: 0.8rem;
  }

  .qr-state-buttons {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .qr-section-heading > span {
    flex-basis: 100%;
    text-align: left;
  }

  .qr-local-spheres {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .qr-mini-bloch {
    max-height: 230px;
  }

  .qr-signal-row {
    grid-template-columns: minmax(52px, 0.55fr) minmax(70px, 1fr) minmax(106px, auto);
    gap: 0.38rem;
  }

  .qr-scale {
    margin-left: 3.8rem;
  }
}

@media (max-width: 420px) {
  .qr-panel,
  .qr-toolbar,
  .qr-state-picker {
    padding-right: 0.72rem;
    padding-left: 0.72rem;
  }

  .qr-segments button {
    padding-right: 0.3rem;
    padding-left: 0.3rem;
    font-size: 0.78rem;
  }

  .qr-target {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }

  .qr-local-spheres {
    grid-template-columns: 1fr;
  }

  .qr-mini-bloch {
    max-height: 210px;
  }

  .qr-signal-row {
    grid-template-columns: minmax(48px, auto) minmax(68px, 1fr);
  }

  .qr-signal-row strong {
    grid-column: 1 / -1;
    margin-top: -0.25rem;
  }

  .qr-scale {
    display: none;
  }
}