/* Living Math Canvas + Isomorphic Lens. Uses the tokens in ewl.css. Calm, large figures; meaning is never colour alone
 * (every filled thing also has a hatch, dots or cross pattern, a dashed outline when pointed at, and a text label). */
.cv-page {
  --cv-a-tint: #d9eaf7;
  --cv-b-tint: #fbe6cb;
  --cv-c-tint: #dbf1f0;
  --cv-gap: 20px;
  margin: 0;
}
.cv-page .cv-wrap {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 16px;
}
.cv-hero {
  background: var(--ewl-brand);
  color: var(--ewl-brand-ink);
  padding: 26px 0 22px;
}
.cv-hero h1 {
  margin: 0 0 6px;
  font-size: 1.9rem;
  line-height: 1.2;
}
.cv-hero p {
  margin: 0;
  max-width: 62ch;
  opacity: 0.95;
}
.cv-hero .cv-es {
  font-style: italic;
  font-size: 0.95em;
}
.cv-main {
  padding: 22px 0 64px;
}
.cv-topbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 16px;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}
.cv-lessonline {
  margin: 0;
  color: var(--ewl-muted);
}

/* ---- scene header and the six stages ---- */
.cv-head h2 {
  margin: 0 0 4px;
  font-size: 1.6rem;
  line-height: 1.25;
}
.cv-head h2:focus {
  outline: none;
}
.cv-blurb {
  margin: 0 0 12px;
  color: var(--ewl-muted);
  max-width: 70ch;
}
.cv-chips-row {
  margin-bottom: 14px;
}
.cv-chip {
  display: inline-block;
  padding: 3px 12px;
  border: 1px solid var(--ewl-line);
  border-radius: 999px;
  background: var(--ewl-card);
  font-size: 0.9rem;
  color: var(--ewl-muted);
}
.cv-chip-done {
  border-color: var(--ewl-ok);
  color: var(--ewl-ok);
  font-weight: 700;
}
.cv-steps {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 8px;
  list-style: none;
  margin: 0 0 var(--cv-gap);
  padding: 0;
}
.cv-stepbtn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  min-height: 48px;
  padding: 6px 8px;
  border: 2px solid var(--ewl-line);
  border-radius: 12px;
  background: var(--ewl-card);
  color: var(--ewl-ink);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}
.cv-stepbtn:disabled {
  opacity: 0.55;
  cursor: default;
}
.cv-stepnum {
  display: inline-grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 2px solid currentColor;
  font-size: 0.85rem;
  flex: none;
}
.cv-steps [data-state="current"] .cv-stepbtn {
  background: var(--ewl-brand);
  border-color: var(--ewl-brand);
  color: var(--ewl-brand-ink);
}
.cv-steps [data-state="done"] .cv-stepbtn {
  border-color: var(--ewl-ok);
  color: var(--ewl-ok);
}
.cv-steps [data-state="done"] .cv-stepnum {
  background: var(--ewl-ok);
  border-color: var(--ewl-ok);
  color: #fff;
}
.cv-layout {
  display: grid;
  gap: var(--cv-gap);
  align-items: start;
}
@media (min-width: 1100px) {
  .cv-layout {
    grid-template-columns: minmax(340px, 400px) minmax(0, 1fr);
  }
  .cv-panel {
    position: sticky;
    top: 12px;
  }
}
.cv-panel {
  padding: 20px 22px;
}
.cv-prompt {
  margin: 0 0 14px;
  font-size: 1.15rem;
  line-height: 1.5;
}
.cv-facts {
  margin: 0 0 12px;
  padding: 10px 14px;
  border-left: 6px solid var(--ewl-brand);
  background: var(--cv-a-tint);
  border-radius: 8px;
  font-weight: 700;
}
.cv-note,
.cv-hint,
.cv-status {
  color: var(--ewl-muted);
  font-size: 0.95rem;
  margin: 6px 0 0;
}
.cv-status {
  margin: 14px 0 8px;
  font-weight: 700;
  color: var(--ewl-ink);
}
.cv-actions {
  margin-top: 12px;
}
.cv-fb {
  margin-top: 12px;
}
.cv-msg {
  font-size: 1.05rem;
}
.cv-answer {
  display: grid;
  gap: 6px;
}
.cv-answer label,
.cv-ctl label {
  font-weight: 700;
}
.cv-input,
.cv-text {
  width: 100%;
  min-height: 48px;
  padding: 8px 12px;
  border: 2px solid var(--ewl-muted);
  border-radius: 10px;
  font: inherit;
  font-size: 1.1rem;
  background: #fff;
  color: var(--ewl-ink);
}
.cv-text {
  min-height: 120px;
  margin: 10px 0;
  resize: vertical;
}
.cv-fieldset {
  border: 0;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}
.cv-fieldset legend {
  font-weight: 700;
  margin-bottom: 8px;
  font-size: 1.05rem;
}
.cv-radio {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  min-height: 48px;
  padding: 10px 12px;
  border: 2px solid var(--ewl-line);
  border-radius: 12px;
  background: #fff;
  cursor: pointer;
}
.cv-radio:has(input:checked) {
  border-color: var(--ewl-brand);
  background: var(--cv-a-tint);
}
.cv-radio input {
  width: 24px;
  height: 24px;
  margin-top: 1px;
  flex: none;
  accent-color: var(--ewl-brand);
}
.cv-ctl {
  margin: 12px 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}
.cv-ctl-label {
  flex: 0 0 100%;
  font-weight: 700;
}
.cv-text.cv-ctl {
  display: block;
}
.cv-text .ewl-row {
  flex-wrap: nowrap;
}
.cv-text .cv-input {
  min-width: 0;
}
.cv-step {
  min-width: 48px;
  font-size: 1.3rem;
  line-height: 1;
  padding: 6px 14px;
}
.cv-value {
  min-width: 4.5ch;
  text-align: center;
  font-size: 1.3rem;
  font-weight: 700;
}
.cv-rubric {
  list-style: none;
  margin: 12px 0 8px;
  padding: 0;
  display: grid;
  gap: 6px;
}
.cv-rubric li[data-ok="1"] {
  font-weight: 700;
  color: var(--ewl-ok);
}
.cv-finish {
  margin-top: 14px;
  display: grid;
  gap: 10px;
}
.cv-placeholder {
  text-align: center;
  padding: 40px 24px;
  color: var(--ewl-muted);
  border-style: dashed;
}
.cv-figcard {
  padding: 14px 16px 18px;
}

/* ---- scene chooser ---- */
.cv-chooser h2 {
  margin: 24px 0 10px;
  font-size: 1.25rem;
}
.cv-unit {
  margin: 0 0 6px;
  font-size: 1.05rem;
  color: var(--ewl-muted);
}
.cv-cards {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 280px), 1fr));
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
}
.cv-card {
  display: grid;
  gap: 4px;
  width: 100%;
  min-height: 96px;
  padding: 14px 16px;
  text-align: left;
  border: 2px solid var(--ewl-line);
  border-radius: 14px;
  background: var(--ewl-card);
  color: var(--ewl-ink);
  font: inherit;
  cursor: pointer;
}
.cv-card:hover {
  border-color: var(--ewl-brand);
}
.cv-card strong {
  font-size: 1.1rem;
}
.cv-card span {
  color: var(--ewl-muted);
  font-size: 0.92rem;
}
.cv-card[data-here="1"] {
  border-color: var(--ewl-brand);
  background: var(--cv-a-tint);
}
.cv-card[data-done="1"] strong::after {
  content: " ✓";
  color: var(--ewl-ok);
}

/* ---- teacher evidence ---- */
.cv-teacher {
  margin-top: 28px;
}
.cv-teacher table {
  width: 100%;
  border-collapse: collapse;
}
.cv-teacher th,
.cv-teacher td {
  padding: 8px 10px;
  border-bottom: 1px solid var(--ewl-line);
  text-align: left;
  vertical-align: top;
}
.cv-teacher .cv-arg {
  max-width: 46ch;
  color: var(--ewl-muted);
}

/* ---- the Isomorphic Lens ---- */
.lens-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
}
@media (min-width: 720px) {
  .lens-grid[data-count="2"],
  .lens-grid[data-count="3"],
  .lens-grid[data-count="4"],
  .lens-grid[data-count="5"],
  .lens-grid[data-count="6"] {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .lens-rep[data-wide="1"] {
    grid-column: 1 / -1;
  }
}
.lens-rep {
  margin: 0;
  padding: 10px 12px 12px;
  border: 1px solid var(--ewl-line);
  border-radius: 12px;
  background: #fff;
  min-width: 0;
}
.lens-name {
  font-weight: 700;
  margin: 0 0 4px;
  color: var(--ewl-brand);
}
.lens-svg {
  display: block;
  width: 100%;
  height: auto;
  max-height: 460px;
  overflow: visible;
}
.lens-caption {
  margin: 14px 0 0;
  padding: 10px 14px;
  border-left: 6px solid var(--ewl-line);
  border-radius: 8px;
  background: #fff;
  color: var(--ewl-muted);
  min-height: 3.4em;
}
.lens-caption[data-on="1"] {
  border-left-color: var(--ewl-accent);
  color: var(--ewl-ink);
  font-weight: 700;
}
.lens-t {
  font: 14px/1 var(--ewl-font);
  fill: var(--ewl-ink);
}
.lens-tiny {
  font-size: 14px;
}
.lens-tick {
  font-size: 17px;
  font-weight: 700;
}
.lens-big {
  font-size: 22px;
  font-weight: 700;
  fill: var(--ewl-brand);
}
.lens-digit {
  font-size: 44px;
  font-weight: 700;
}
.lens-tiny.on {
  font-weight: 700;
}
.lens-a {
  fill: var(--ewl-a);
  font-weight: 700;
}
.lens-b {
  fill: var(--ewl-b);
  font-weight: 700;
}
.lens-pa {
  fill: var(--cv-a-tint);
}
.lens-pa-s {
  stroke: var(--ewl-a);
  stroke-width: 1.6;
  fill: none;
}
.lens-pb {
  fill: var(--cv-b-tint);
}
.lens-pb-s {
  fill: var(--ewl-b);
}
.lens-pc {
  fill: var(--cv-c-tint);
}
.lens-pc-s {
  stroke: var(--ewl-c);
  stroke-width: 1.4;
  fill: none;
}
.lens-cell,
.lens-mini {
  stroke: var(--ewl-ink);
  stroke-opacity: 0.55;
  stroke-width: 1.2;
}
.lens-quiet,
.lens-over {
  fill-opacity: 0;
}
.lens-over {
  stroke: none;
}
.lens-fillbar {
  stroke: none;
  pointer-events: none;
}
.lens-col {
  fill: #fff;
}
.lens-part {
  cursor: pointer;
}
.lens-part:focus {
  outline: none;
}
.lens-part[data-hl="1"] {
  stroke: var(--ewl-accent);
  stroke-width: 4;
  stroke-opacity: 1;
  stroke-dasharray: 6 3;
}
.lens-part[data-hl="1"] .lens-cell,
.lens-part[data-hl="1"] path,
.lens-part[data-hl="1"] line {
  stroke: var(--ewl-accent);
  stroke-opacity: 1;
}
.lens-part[data-focus="1"] {
  stroke: var(--ewl-focus);
  stroke-width: 5;
  stroke-opacity: 1;
  stroke-dasharray: none;
}
.lens-axis {
  stroke: var(--ewl-ink);
  stroke-width: 2;
}
.lens-a-line {
  stroke: var(--ewl-a);
  stroke-width: 4;
}
.lens-b-line {
  stroke: var(--ewl-b);
  stroke-width: 4;
}
.lens-link {
  stroke: var(--ewl-muted);
  stroke-width: 2;
  stroke-dasharray: 3 4;
}
.lens-sq-a {
  fill: var(--ewl-a);
}
.lens-dot-b {
  fill: var(--ewl-b);
}
.lens-sep,
.lens-grid-line {
  stroke: var(--ewl-ink);
  stroke-opacity: 0.35;
  stroke-width: 1;
}
.lens-grid-line {
  stroke-opacity: 0.15;
}
.lens-dot {
  fill: var(--ewl-brand);
  stroke: #fff;
  stroke-width: 3;
}
.lens-arrow {
  fill: var(--ewl-brand);
}
.lens-brace {
  fill: none;
  stroke: var(--ewl-brand);
  stroke-width: 3;
}
.lens-rule {
  stroke: var(--ewl-brand);
  stroke-width: 3;
}
.lens-diamond {
  fill: var(--ewl-b);
  stroke: var(--ewl-ink);
  stroke-width: 2;
}
.lens-ghost {
  stroke: var(--ewl-bad);
  stroke-width: 3;
  stroke-dasharray: 6 5;
}
.lens-ghosttxt {
  fill: var(--ewl-bad);
  font-weight: 700;
  font-size: 15px;
}
.lens-beam {
  stroke: var(--ewl-ink);
  stroke-width: 8;
  stroke-linecap: round;
}
.lens-rope {
  stroke: var(--ewl-muted);
  stroke-width: 3;
}
.lens-pivot {
  fill: var(--ewl-muted);
}
.lens-bag,
.lens-unit {
  stroke: var(--ewl-ink);
  stroke-width: 2;
}
.lens-face {
  stroke: var(--ewl-ink);
  stroke-width: 1.2;
}
.lens-face-t {
  fill-opacity: 0.55;
}
.lens-face-r {
  fill-opacity: 0.8;
}
.lens-xs {
  fill: var(--ewl-ink);
  font-size: 22px;
}
.lens-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-top: 8px;
}
.lens-chiplabel {
  font-weight: 700;
}
.lens-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 1.05rem;
}
.lens-table caption {
  text-align: left;
  font-weight: 700;
  padding-bottom: 6px;
}
.lens-table th,
.lens-table td {
  padding: 8px 10px;
  border-bottom: 1px solid var(--ewl-line);
  text-align: left;
}
.lens-table thead th {
  font-size: 0.92rem;
  color: var(--ewl-muted);
}
.lens-table tfoot td {
  color: var(--ewl-muted);
  font-size: 0.95rem;
}
.lens-mult {
  color: var(--ewl-muted);
}
.lens-rowbtn {
  min-height: 44px;
  min-width: 44px;
  padding: 4px 14px;
  border: 2px solid var(--ewl-line);
  border-radius: 10px;
  background: #fff;
  font: inherit;
  font-weight: 700;
  color: var(--ewl-ink);
  cursor: pointer;
}
.lens-table tr[data-hl="1"] {
  background: var(--cv-b-tint);
  outline: 3px dashed var(--ewl-accent);
  outline-offset: -3px;
}
.lens-table tr[data-hl="1"] .lens-rowbtn {
  border-color: var(--ewl-accent);
}
.ewl-chip[data-hl="1"] {
  box-shadow: 0 0 0 3px var(--ewl-accent);
}
.lens-compare {
  display: grid;
  gap: 16px;
}
@media (min-width: 900px) {
  .lens-compare {
    grid-template-columns: 1fr 1fr;
  }
}

/* narrow screens: the figures scale down, so the labels inside them scale up */
@media (max-width: 640px) {
  .cv-hero h1 {
    font-size: 1.55rem;
  }
  .cv-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .cv-panel {
    padding: 16px;
  }
  .lens-tiny,
  .lens-t {
    font-size: 19px;
  }
  .lens-tick {
    font-size: 22px;
  }
  .lens-big {
    font-size: 28px;
  }
  .lens-digit {
    font-size: 54px;
  }
  .lens-ghosttxt {
    font-size: 20px;
  }
}
@media (prefers-reduced-motion: reduce) {
  .cv-page * {
    transition: none !important;
    animation: none !important;
  }
}
@media (forced-colors: active) {
  .lens-part[data-hl="1"] {
    stroke: Highlight;
  }
  .cv-stepbtn {
    border-color: ButtonText;
  }
}
@media print {
  .cv-hero,
  .cv-topbar,
  .cv-steps,
  .cv-panel,
  .cv-layout,
  .cv-chooser,
  .cv-noprint {
    display: none !important;
  }
  .cv-teacher {
    margin: 0;
  }
}
.cv-hero h1,
.cv-hero p {
  color: var(--ewl-brand-ink);
}
.cv-page .cv-hero h1,
.cv-page .cv-hero p,
.cv-page .cv-hero span {
  color: var(--ewl-brand-ink);
}
.lens-tiny.on {
  paint-order: stroke;
  stroke: #fff;
  stroke-width: 4px;
  stroke-linejoin: round;
}
@media (max-width: 640px) {
  .cv-stepbtn {
    flex-direction: column;
    gap: 2px;
    padding: 4px 2px;
    min-height: 56px;
  }
  .cv-stepname {
    font-size: 0.78rem;
  }
}
.cv-teacher {
  overflow-x: auto;
}
.cv-teacher table {
  min-width: 560px;
}
.lens-quantities,
.lens-statements {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.lens-qty {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
}
.lens-qty-bar {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 8px;
  border-radius: 6px;
  background: #d7efe8;
  color: #17324d;
  font-weight: 700;
}
.lens-qty-bar-b {
  background: #f4e4c4;
}
.lens-statements .lens-rowbtn,
.lens-qty .lens-rowbtn {
  min-height: 44px;
}