.matrix-page {
  overflow: hidden;
}

.matrix-shell {
  width: min(1640px, calc(100vw - 64px));
  grid-template-rows: auto auto minmax(0, 1fr) auto;
  gap: 14px;
  padding-top: 24px;
  padding-bottom: 20px;
}

.matrix-link,
.matrix-catalogue-link {
  border: 1px solid var(--line);
  padding-left: 12px;
}

.matrix-intro {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(18px);
}

.matrix-kicker {
  display: block;
  margin-bottom: 4px;
  color: var(--chartreuse);
  font-size: 10px;
  font-weight: 900;
  letter-spacing: 0.13em;
}

.matrix-intro h2 {
  font-size: clamp(18px, 2vw, 24px);
  line-height: 1.1;
}

.matrix-intro p {
  margin-top: 5px;
  color: var(--muted);
  font-size: 13px;
}

.matrix-legend {
  display: flex;
  align-items: center;
  gap: 5px;
  flex: 0 0 auto;
  color: var(--muted);
  font-size: 11px;
  font-weight: 750;
}

.legend-swatch {
  width: 20px;
  height: 20px;
  border: 1px solid color-mix(in srgb, var(--chartreuse) 25%, var(--line));
  border-radius: 5px;
  background: color-mix(in srgb, var(--chartreuse) var(--heat), var(--paper-strong));
}

.matrix-workspace {
  display: grid;
  grid-template-columns: minmax(720px, 1fr) minmax(300px, 360px);
  gap: 12px;
  min-height: 0;
}

.matrix-card,
.matrix-detail {
  min-height: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(18px);
}

.matrix-card {
  position: relative;
  padding: 38px 16px 14px 54px;
  overflow: hidden;
}

.matrix-axis-title {
  position: absolute;
  z-index: 5;
  color: var(--fig-deep);
  font-size: 11px;
  font-weight: 850;
  letter-spacing: 0.035em;
}

.matrix-axis-x {
  top: 13px;
  left: 116px;
}

.matrix-axis-y {
  top: 98px;
  left: 17px;
  writing-mode: vertical-rl;
}

.matrix-scroll {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  width: 100%;
  height: 100%;
  overflow: hidden;
  outline: none;
}

.matrix-scroll:focus-visible {
  box-shadow: 0 0 0 3px var(--fig-soft);
}

.lesson-matrix {
  --cell: 27px;
  --header: 42px;
  --row-label: 58px;
  border-collapse: separate;
  border-spacing: 1px;
  table-layout: fixed;
  color: var(--ink);
}

.lesson-matrix th,
.lesson-matrix td {
  padding: 0;
}

.lesson-matrix thead th {
  position: sticky;
  top: 0;
  z-index: 8;
  width: var(--cell);
  min-width: var(--cell);
  height: var(--header);
  border-radius: clamp(2px, calc(var(--cell) * 0.2), 6px);
  background: var(--paper-strong);
  color: var(--muted);
  font-size: clamp(6px, calc(var(--cell) * 0.36), 9px);
  font-weight: 850;
  line-height: 1;
}

.matrix-column-header span {
  position: absolute;
  top: 50%;
  left: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--header);
  height: var(--cell);
  white-space: nowrap;
  transform: translate(-50%, -50%) rotate(-90deg);
  transform-origin: center;
}

.matrix-axis-selector {
  position: relative;
  display: grid;
  place-items: center;
  width: 100%;
  height: 100%;
  padding: 0;
  border: 0;
  border-radius: inherit;
  background: transparent;
  color: inherit;
  font: inherit;
  font-weight: inherit;
  line-height: inherit;
}

.matrix-axis-selector:hover,
.matrix-axis-selector:focus-visible {
  background: var(--fig-soft);
  color: var(--fig-deep);
  outline: none;
}

.matrix-row-selector {
  justify-content: end;
  padding-right: clamp(3px, calc(var(--cell) * 0.3), 7px);
}

.lesson-matrix thead .matrix-corner {
  left: 0;
  z-index: 12;
  width: var(--row-label);
  min-width: var(--row-label);
}

.lesson-matrix tbody th {
  position: sticky;
  left: 0;
  z-index: 7;
  width: var(--row-label);
  min-width: var(--row-label);
  height: var(--cell);
  border-radius: clamp(2px, calc(var(--cell) * 0.2), 6px);
  background: var(--paper-strong);
  color: var(--muted);
  font-size: clamp(6px, calc(var(--cell) * 0.38), 10px);
  font-weight: 850;
  text-align: right;
}

.matrix-cell,
.matrix-cell-empty {
  display: grid;
  place-items: center;
  width: var(--cell);
  height: var(--cell);
  border-radius: clamp(2px, calc(var(--cell) * 0.2), 6px);
}

.matrix-cell-empty {
  background: color-mix(in srgb, var(--line) 35%, transparent);
}

.matrix-cell {
  padding: 0;
  border: 1px solid color-mix(in srgb, var(--chartreuse) 42%, var(--line));
  background: color-mix(in srgb, var(--chartreuse) var(--heat), var(--paper-strong));
  transition: transform 0.12s ease, box-shadow 0.12s ease, border-color 0.12s ease;
}

.matrix-cell:hover,
.matrix-cell:focus-visible {
  z-index: 3;
  border-color: var(--fig-deep);
  box-shadow: 0 5px 14px rgba(38, 31, 45, 0.18);
  outline: none;
  transform: scale(1.14);
}

.matrix-cell.is-selected {
  border-color: var(--fig-deep);
  box-shadow: 0 0 0 2px var(--paper-strong), 0 0 0 4px var(--fig);
}

.lesson-matrix th.is-traced {
  background: var(--fig-soft);
  color: var(--fig-deep);
}

.lesson-matrix th.is-selected {
  background: var(--fig);
  color: #fffdf5;
  box-shadow: inset 0 0 0 2px var(--fig-deep);
}

.matrix-detail {
  overflow: auto;
  padding: 20px;
}

.matrix-detail-empty {
  display: grid;
  align-content: center;
  min-height: 100%;
}

.matrix-detail h2 {
  margin-top: 7px;
  font-size: 22px;
  line-height: 1.16;
}

.matrix-detail p {
  margin-top: 8px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.matrix-detail .detail-kicker {
  color: var(--chartreuse);
}

.matrix-detail-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 7px;
  margin: 16px 0;
}

.matrix-detail-stats.is-three {
  grid-template-columns: repeat(3, 1fr);
}

.matrix-detail .dismiss-hint {
  margin-top: 9px;
  font-size: 11px;
}

.matrix-detail-stat {
  padding: 11px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--fig-soft);
}

.matrix-detail-stat strong {
  display: block;
  color: var(--fig-deep);
  font-size: 20px;
}

.matrix-detail-stat span {
  color: var(--muted);
  font-size: 10px;
  font-weight: 800;
}

.matrix-point-group {
  padding: 13px 0;
  border-top: 1px solid var(--line);
}

.matrix-point-group h3 {
  margin: 0;
  color: var(--ink);
  font-size: 14px;
  line-height: 1.35;
}

.matrix-point-group h4 {
  margin: 0;
  color: var(--ink);
  font-size: 13px;
  line-height: 1.35;
}

.matrix-cell-group {
  padding-top: 17px;
  border-top: 2px solid color-mix(in srgb, var(--fig) 28%, var(--line));
}

.matrix-cell-group + .matrix-cell-group {
  margin-top: 5px;
}

.matrix-cell-group > h3 {
  margin: 0;
  color: var(--fig-deep);
  font-size: 15px;
}

.matrix-cell-group-meta {
  display: block;
  margin-top: 3px;
  color: var(--muted);
  font-size: 10px;
  font-weight: 750;
}

.matrix-exercise-list {
  display: grid;
  gap: 7px;
  margin: 9px 0 0;
  padding: 0;
  list-style: none;
}

.matrix-exercise-list li {
  padding-left: 10px;
  border-left: 2px solid var(--chartreuse);
  color: var(--muted);
  font-size: 12px;
  line-height: 1.4;
}

.matrix-exercise-list strong {
  color: var(--fig-deep);
}

@media (max-width: 1100px) {
  .matrix-shell {
    width: min(100% - 28px, 1000px);
  }

  .matrix-workspace {
    grid-template-columns: minmax(0, 1fr);
    overflow: auto;
  }

  .matrix-card {
    min-height: 570px;
  }

  .matrix-detail {
    min-height: 300px;
    overflow: visible;
  }
}

@media (max-width: 680px) {
  .matrix-page {
    overflow: auto;
  }

  .matrix-shell {
    height: auto;
    min-height: 100svh;
    padding: 18px 0;
  }

  .matrix-shell .topbar,
  .matrix-intro {
    align-items: flex-start;
    flex-direction: column;
  }

  .matrix-intro {
    gap: 14px;
  }

  .matrix-card {
    min-height: 520px;
    padding-left: 45px;
  }
}