/* ==========================================================================
   Native diagram system
   --------------------------------------------------------------------------
   1. Shell & tokens      — figure chrome, tone palette, prose resets
   2. Primitives          — d-* components composed by site/diagrams/kit.mjs
   3. Responsive          — one collapse story for every primitive
   4. Per-diagram geometry— only genuinely one-off shapes live here
   ========================================================================== */

/* ==========================================================================
   1. Shell & tokens
   ========================================================================== */

.native-diagram {
  --d-blue: #2c72c7;
  --d-violet: #7452d6;
  --d-amber: #b9610f;
  --d-green: #1d7a51;
  --d-rose: #b4485f;
  --d-slate: #5c6b74;
  --d-danger: #c02f2f;
  --t: var(--accent);
  --t-ink: var(--accent);
  --t-soft: color-mix(in srgb, var(--t) 11%, var(--paper-raised));
  --t-line: color-mix(in srgb, var(--t) 42%, var(--line));

  position: relative;
  isolation: isolate;
  margin: 34px 0 44px;
  padding: 30px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 18px;
  color: var(--ink);
  background:
    linear-gradient(135deg, color-mix(in srgb, var(--paper-raised) 96%, transparent), color-mix(in srgb, var(--paper-soft) 62%, transparent)),
    var(--paper-raised);
  box-shadow: 0 14px 42px rgb(24 33 31 / 8%);
  font-family: var(--font-sans);
  font-size: 13px;
  font-style: normal;
  line-height: 1.5;
  overflow-wrap: break-word;
}

html[data-theme="dark"] .native-diagram {
  --d-blue: #6ea6f0;
  --d-violet: #a992ea;
  --d-amber: #eea35e;
  --d-green: #4fc191;
  --d-rose: #ea8fa1;
  --d-slate: #93a3ad;
  --d-danger: #f07a7a;
}

@media (prefers-color-scheme: dark) {
  html[data-theme="auto"] .native-diagram {
    --d-blue: #6ea6f0;
    --d-violet: #a992ea;
    --d-amber: #eea35e;
    --d-green: #4fc191;
    --d-rose: #ea8fa1;
    --d-slate: #93a3ad;
    --d-danger: #f07a7a;
  }
}

.native-diagram::before {
  position: absolute;
  z-index: -1;
  top: -140px;
  right: -100px;
  width: 330px;
  height: 330px;
  border: 1px solid color-mix(in srgb, var(--accent) 14%, transparent);
  border-radius: 50%;
  content: "";
  box-shadow: inset 0 0 0 45px color-mix(in srgb, var(--accent-soft) 16%, transparent);
}

/* Neutralise the prose rhythm inside diagrams — spacing is component-owned. */
.prose .native-diagram :is(h2, h3, h4, p, ol, ul, li) {
  margin: 0;
}

.prose .native-diagram li + li {
  margin-top: 0;
}

.prose .native-diagram :is(h2, h3, h4) {
  font-family: var(--font-sans);
  letter-spacing: -0.025em;
}

.prose .native-diagram h2 {
  margin-top: 7px;
  font-size: clamp(1.3rem, 2.4vw, 1.75rem);
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.012em;
}

.prose .native-diagram h3 {
  font-size: 13.5px;
  font-weight: 700;
  line-height: 1.45;
}

.prose .native-diagram h4 {
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.06em;
}

.prose .native-diagram code {
  padding: 0;
  border: 0;
  color: inherit;
  background: transparent;
  font-family: var(--font-mono);
  font-size: 11px;
}

.prose .native-diagram :is(ol, ul) {
  padding: 0;
  list-style: none;
}

.diagram-heading {
  display: grid;
  align-items: end;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line);
  grid-template-columns: minmax(0, 1.25fr) minmax(220px, 0.75fr);
  gap: 28px;
}

.diagram-heading > p {
  max-width: 360px;
  justify-self: end;
  color: var(--ink-soft);
  font-size: 12px;
  line-height: 1.7;
}

.diagram-kicker {
  display: block;
  color: var(--accent);
  font-size: 9px;
  font-weight: 820;
  letter-spacing: 0.15em;
}

.native-diagram figcaption {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 7px;
  margin-top: 18px;
  color: var(--ink-faint);
  font-size: 8.5px;
}

.native-diagram figcaption span {
  padding: 4px 9px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--paper-raised);
}

/* Tone palette — every primitive reads --t / --t-soft / --t-line. */
.native-diagram .tone-blue { --t: var(--d-blue); }
.native-diagram .tone-violet { --t: var(--d-violet); }
.native-diagram .tone-amber { --t: var(--d-amber); }
.native-diagram .tone-green { --t: var(--d-green); }
.native-diagram .tone-rose { --t: var(--d-rose); }
.native-diagram .tone-slate { --t: var(--d-slate); }
.native-diagram .tone-accent { --t: var(--accent); }

.native-diagram [class*="tone-"] {
  --t-soft: color-mix(in srgb, var(--t) 11%, var(--paper-raised));
  --t-line: color-mix(in srgb, var(--t) 42%, var(--line));
}

/* Vertical rhythm between top-level blocks of a diagram body. */
.native-diagram > :is(.d-rail, .d-cols, .d-stats, .d-bars, .d-callout, .d-split, .d-table, .d-formula, .d-steps, .d-stack, .d-legend, .d-tags, .d-note, .d-panel) {
  margin-top: 14px;
}

.native-diagram > .diagram-heading + * {
  margin-top: 20px;
}

/* ==========================================================================
   2. Primitives
   ========================================================================== */

/* -- arrows ---------------------------------------------------------------- */

.d-arrow {
  width: 46px;
  flex: 0 0 auto;
  align-self: center;
  justify-self: center;
  overflow: visible;
  fill: none;
  stroke: var(--line-strong);
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.6;
}

.d-arrow.is-down {
  width: 18px;
  height: 26px;
}

/* -- rail ------------------------------------------------------------------ */

.d-rail {
  display: flex;
  flex-direction: column;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: color-mix(in srgb, var(--paper-raised) 85%, transparent);
}

/* One row, no wrapping — cells shrink together so the flow stays readable. */
.d-rail-track {
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: 6px;
}

.d-rail.is-tight .d-rail-track {
  gap: 8px;
}

.d-rail > em {
  margin-top: 10px;
  padding-top: 9px;
  border-top: 1px solid var(--line);
  color: var(--ink-faint);
  font-family: var(--font-serif);
  font-size: 10.5px;
  font-style: normal;
  text-align: center;
}

.d-node {
  display: flex;
  min-width: 0;
  flex: 1 1 120px;
  flex-direction: column;
  justify-content: center;
  padding: 8px 11px;
  border-radius: 9px;
}

.d-node small {
  color: var(--ink-faint);
  font-size: 8px;
  font-weight: 800;
  letter-spacing: 0.11em;
}

.d-node strong {
  margin: 3px 0 1px;
  font-family: var(--font-serif);
  font-size: 16px;
  line-height: 1.35;
}

.d-node span {
  color: var(--ink-faint);
  font-size: 10px;
}

.d-node.is-accent {
  color: var(--t);
  background: color-mix(in srgb, var(--t) 13%, transparent);
}

.d-node.is-accent :is(small, span) {
  color: color-mix(in srgb, var(--t) 74%, var(--ink-soft));
}

.d-node[class*="tone-"]:not(.is-accent) {
  border: 1px solid var(--t-line);
  background: var(--t-soft);
}

.d-node[class*="tone-"]:not(.is-accent) strong {
  color: var(--t);
}

/* -- columns & panels ------------------------------------------------------ */

.d-cols {
  display: grid;
  align-items: stretch;
  grid-template-columns: repeat(var(--cols, 2), minmax(0, 1fr));
  gap: 12px;
}

.d-cols.cols-1 { --cols: 1; }
.d-cols.cols-2 { --cols: 2; }
.d-cols.cols-3 { --cols: 3; }
.d-cols.cols-4 { --cols: 4; }
.d-cols.cols-5 { --cols: 5; }
.d-cols.cols-6 { --cols: 6; }

.d-panel {
  display: flex;
  min-width: 0;
  flex-direction: column;
  padding: 16px 17px;
  border: 1px solid var(--line);
  border-top: 3px solid var(--t-line);
  border-radius: 13px;
  background: var(--paper-raised);
  box-shadow: var(--shadow-sm);
  gap: 9px;
}

.d-panel[class*="tone-"] {
  border-top-color: var(--t);
  background: color-mix(in srgb, var(--t) 5%, var(--paper-raised));
}

.d-panel-label {
  display: flex;
  align-items: center;
  color: var(--t, var(--ink-faint));
  font-size: 8px;
  font-weight: 820;
  gap: 8px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* Pill rather than circle: indices range from "01" to "SCHEDULE". Uppercasing
   is deliberately not inherited here — it would turn "η" into "Η". */
.d-panel-label > span {
  text-transform: none;
  display: grid;
  min-width: 22px;
  height: 22px;
  flex: 0 0 auto;
  padding: 0 7px;
  place-items: center;
  border: 1px solid var(--t-line);
  border-radius: 11px;
  color: var(--t, var(--ink-soft));
  background: color-mix(in srgb, var(--t) 10%, transparent);
  font-size: 8px;
  white-space: nowrap;
}

.d-panel > h3 {
  color: var(--ink);
}

.d-panel > :last-child {
  margin-bottom: 0;
}

/* -- steps ----------------------------------------------------------------- */

.d-steps {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.d-steps::before {
  position: absolute;
  z-index: 0;
  top: 22px;
  bottom: 22px;
  left: 21px;
  width: 1px;
  background: color-mix(in srgb, var(--accent) 32%, var(--line));
  content: "";
}

.d-step {
  position: relative;
  z-index: 1;
  display: grid;
  min-height: 52px;
  align-items: center;
  padding: 9px 11px 9px 8px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--paper-raised);
  grid-template-columns: auto minmax(0, 1fr);
  gap: 10px;
}

.d-step[class*="tone-"] {
  border-color: var(--t-line);
  background: var(--t-soft);
}

.d-step-index {
  display: grid;
  min-width: 28px;
  height: 28px;
  padding: 0 6px;
  place-items: center;
  border: 1px solid var(--t-line);
  border-radius: 14px;
  color: var(--t);
  background: var(--paper-raised);
  font-size: 8px;
  font-weight: 800;
  line-height: 1;
  text-align: center;
  white-space: nowrap;
}

.d-step > div {
  display: flex;
  min-width: 0;
  flex-direction: column;
  gap: 1px;
}

.d-step strong {
  font-size: 10.5px;
}

.d-step code {
  color: var(--ink-soft);
  line-height: 1.45;
  overflow-wrap: break-word;
}

.d-step small {
  margin-top: 2px;
  color: color-mix(in srgb, var(--t) 82%, var(--ink-faint));
  font-size: 8.5px;
}

/* -- stack ----------------------------------------------------------------- */

.d-stack {
  display: flex;
  flex-direction: column;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: color-mix(in srgb, var(--paper-raised) 85%, transparent);
  gap: 6px;
}

.d-layer {
  display: grid;
  align-items: center;
  padding: 8px 12px;
  border: 1px solid var(--t-line);
  border-radius: 8px;
  background: var(--t-soft);
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 12px;
}

.d-layer.is-dim {
  border-style: dashed;
  border-color: var(--line);
  background: transparent;
}

.d-layer-side {
  color: var(--t, var(--ink-faint));
  font-size: 7.5px;
  font-weight: 820;
  letter-spacing: 0.09em;
  text-align: right;
  text-transform: uppercase;
}

.d-layer strong {
  display: block;
  font-size: 11px;
}

.d-layer small {
  display: block;
  margin-top: 2px;
  color: var(--ink-faint);
  font-size: 9px;
}

.d-repeat {
  position: relative;
  height: 20px;
  margin: 2px 30px 2px 66px;
  border: 1px dashed var(--line-strong);
  border-top: 0;
  border-radius: 0 0 8px 8px;
}

.d-repeat span {
  position: absolute;
  top: 12px;
  left: 50%;
  padding: 0 8px;
  color: var(--ink-faint);
  background: var(--paper-raised);
  font-size: 8px;
  font-weight: 780;
  transform: translateX(-50%);
}

/* -- stats ----------------------------------------------------------------- */

.d-stats {
  display: grid;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--paper-raised);
  grid-auto-columns: minmax(0, 1fr);
  grid-auto-flow: column;
}

.d-stats > div {
  min-width: 0;
  padding: 14px 16px;
  border-right: 1px solid var(--line);
}

.d-stats > div:last-child {
  border-right: 0;
}

.d-stats > div.d-stat-note {
  display: flex;
  flex-direction: column;
  justify-content: center;
  grid-column: span 2;
}

.d-stats :is(small, strong, span) {
  display: block;
}

.d-stats small {
  color: var(--ink-faint);
  font-size: 7.5px;
  font-weight: 820;
  letter-spacing: 0.1em;
}

.d-stats strong {
  margin: 3px 0;
  color: var(--t, var(--accent));
  font-family: var(--font-serif);
  font-size: 23px;
  line-height: 1.2;
}

.d-stats strong em {
  color: var(--ink-faint);
  font-size: 14px;
  font-style: normal;
}

.d-stats span {
  color: var(--ink-faint);
  font-size: 8.5px;
}

.d-stats .d-stat-note strong {
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 12px;
}

/* -- bars ------------------------------------------------------------------ */

.d-bars {
  display: grid;
  align-items: center;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--paper-raised);
  grid-template-columns: 108px minmax(0, 1fr) 118px;
  gap: 18px;
}

.d-bars.no-label { grid-template-columns: minmax(0, 1fr) 118px; }
.d-bars.no-aside { grid-template-columns: 108px minmax(0, 1fr); }
.d-bars.no-label.no-aside { grid-template-columns: minmax(0, 1fr); }

.d-bars-label :is(span, strong, small) {
  display: block;
}

.d-bars-label span {
  color: var(--accent);
  font-size: 9px;
  font-weight: 800;
}

.d-bars-label strong {
  margin: 2px 0;
  font-size: 12px;
}

.d-bars-label small {
  color: var(--ink-faint);
  font-size: 8px;
}

.d-bars-track {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.d-bars-track > div {
  display: grid;
  align-items: center;
  color: var(--ink-faint);
  font-size: 8.5px;
  grid-template-columns: minmax(78px, 118px) minmax(70px, 1fr) 34px;
  gap: 9px;
}

.d-bars-track i {
  position: relative;
  display: block;
  height: 5px;
  overflow: hidden;
  border-radius: 3px;
  background: var(--paper-soft);
}

.d-bars-track i::after {
  position: absolute;
  inset: 0 auto 0 0;
  width: var(--bar);
  border-radius: inherit;
  background: var(--line-strong);
  content: "";
}

.d-bars-track strong {
  color: var(--ink-soft);
  text-align: right;
}

.d-bars-track .is-highlight {
  color: var(--accent);
  font-weight: 700;
}

.d-bars-track .is-highlight i::after,
.d-bars-track .is-highlight strong {
  color: var(--accent);
  background: var(--accent);
}

.d-bars-track .is-highlight strong {
  background: none;
}

.d-bars-result {
  padding-left: 15px;
  border-left: 1px solid var(--line);
}

.d-bars-result :is(strong, span) {
  display: block;
}

.d-bars-result strong {
  color: var(--accent);
  font-family: var(--font-serif);
  font-size: 22px;
  line-height: 1.1;
}

.d-bars-result span {
  margin-top: 5px;
  color: var(--ink-faint);
  font-size: 8px;
}

/* -- tags ------------------------------------------------------------------ */

.d-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
}

.d-tag {
  flex: 0 0 auto;
  padding: 2px 6px;
  border-radius: 5px;
  color: var(--t, var(--ink-soft));
  background: color-mix(in srgb, var(--t, var(--ink-faint)) 13%, transparent);
  font-size: 7.5px;
  font-style: normal;
  font-weight: 780;
  letter-spacing: 0.04em;
}

/* -- callout --------------------------------------------------------------- */

.d-callout {
  display: grid;
  align-items: center;
  padding: 14px 17px;
  border: 1px solid var(--t-line);
  border-radius: 12px;
  background: var(--t-soft);
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
}

.d-callout-label {
  color: var(--t);
  font-size: 8.5px;
  font-weight: 820;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  writing-mode: horizontal-tb;
}

.d-callout > div > strong {
  display: block;
  color: var(--t);
  font-size: 13px;
}

.d-callout p strong {
  color: var(--ink);
}

.d-callout p {
  margin-top: 4px !important;
  color: var(--ink-soft);
  font-size: 10px;
  line-height: 1.6;
}

/* -- table ----------------------------------------------------------------- */

.d-table {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: var(--paper-raised);
}

.d-row {
  display: grid;
  align-items: center;
  border-bottom: 1px solid var(--line);
  grid-template-columns: repeat(var(--cols, 4), minmax(0, 1fr));
}

.d-table.cols-2 .d-row { --cols: 2; }
.d-table.cols-3 .d-row { --cols: 3; }
.d-table.cols-4 .d-row { --cols: 4; }
.d-table.cols-5 .d-row { --cols: 5; }
.d-table.cols-6 .d-row { --cols: 6; }

.d-row:last-child {
  border-bottom: 0;
}

.d-row > span {
  min-width: 0;
  padding: 9px 11px;
  border-right: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 9.5px;
  line-height: 1.45;
}

.d-row > span:first-child {
  color: var(--ink);
  font-weight: 700;
}

.d-row > span:last-child {
  border-right: 0;
}

.d-row.is-head {
  background: var(--paper-soft);
}

/*
 * No `text-transform: uppercase` here: it mangles the Greek letters these
 * headers carry (η → Η, σ_up → Σ_UP). Authors write the casing they want.
 */
.d-row.is-head > span {
  color: var(--ink-faint);
  font-size: 8.5px;
  font-weight: 800;
  letter-spacing: 0.06em;
}

.d-row[class*="tone-"] {
  background: var(--t-soft);
}

.d-row[class*="tone-"] > span:first-child {
  color: var(--t);
}

.d-row.is-highlight {
  box-shadow: inset 3px 0 0 var(--t, var(--accent));
}

/* -- formula --------------------------------------------------------------- */

.d-formula {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  padding: 15px 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--paper-raised);
  gap: 6px 12px;
}

.d-formula-term {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 6px 12px;
  border-radius: 8px;
  background: color-mix(in srgb, var(--t, var(--accent)) 9%, transparent);
}

.d-formula-term small {
  color: var(--ink-faint);
  font-size: 7.5px;
  font-weight: 820;
  letter-spacing: 0.1em;
}

.d-formula-term strong {
  margin-top: 2px;
  color: var(--t, var(--ink));
  font-family: var(--font-serif);
  font-size: 15.5px;
  white-space: nowrap;
}

.d-formula-op {
  color: var(--ink-faint);
  font-family: var(--font-serif);
  font-size: 15px;
}

/* width (not flex-basis) so this still behaves when the container is a column. */
.d-formula > p {
  width: 100%;
  margin-top: 6px !important;
  padding-top: 10px !important;
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 10px;
  text-align: center;
}

/* -- split ----------------------------------------------------------------- */

.d-split {
  display: grid;
  align-items: stretch;
  grid-template-columns: minmax(0, 1fr) 60px minmax(0, 1fr);
  gap: 12px;
}

.d-transform {
  display: flex;
  min-width: 0;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--t, var(--d-violet));
  gap: 7px;
  text-align: center;
}

.d-transform > span {
  font-size: 9px;
  font-weight: 800;
  letter-spacing: 0.07em;
}

.d-transform .d-arrow {
  stroke: currentColor;
  stroke-width: 2;
}

.d-transform small {
  color: var(--ink-faint);
  font-family: var(--font-serif);
  font-size: 9px;
  line-height: 1.3;
}

/* -- matrix ---------------------------------------------------------------- */

.d-matrix {
  display: block;
  width: 100%;
  max-width: 180px;
  height: auto;
  overflow: visible;
}

.d-matrix rect {
  fill: color-mix(in srgb, var(--t, var(--accent)) 22%, transparent);
}

.d-matrix rect.on { fill: color-mix(in srgb, var(--t, var(--accent)) 70%, transparent); }
.d-matrix rect.hi { fill: var(--t, var(--accent)); }
.d-matrix rect.alt { fill: color-mix(in srgb, var(--d-amber) 62%, transparent); }
.d-matrix rect.alt2 { fill: color-mix(in srgb, var(--d-violet) 58%, transparent); }
.d-matrix rect.alt3 { fill: color-mix(in srgb, var(--d-blue) 58%, transparent); }
.d-matrix rect.off { fill: color-mix(in srgb, var(--line-strong) 45%, transparent); }
.d-matrix rect.pad {
  fill: none;
  stroke: var(--line-strong);
  stroke-dasharray: 2 2;
  stroke-width: 0.7;
}

.d-matrix .d-matrix-frame {
  fill: none;
  stroke: color-mix(in srgb, var(--t, var(--accent)) 45%, var(--line));
  stroke-width: 1;
}

.d-matrix .d-matrix-diagonal {
  fill: none;
  stroke: color-mix(in srgb, var(--t, var(--accent)) 40%, transparent);
  stroke-dasharray: 3 4;
  stroke-width: 0.8;
}

/* -- curve ----------------------------------------------------------------- */

.d-curve {
  display: block;
  width: 100%;
  max-width: 260px;
  height: auto;
}

.d-curve-grid {
  fill: none;
  stroke: var(--line);
  stroke-dasharray: 2 4;
  stroke-width: 0.8;
}

.d-curve-axis {
  fill: none;
  stroke: var(--line-strong);
  stroke-width: 1;
}

.d-curve-line {
  fill: none;
  stroke: var(--t, var(--accent));
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 2;
}

.d-curve-line.is-dashed {
  stroke-dasharray: 4 3;
}

.d-curve-area {
  fill: color-mix(in srgb, var(--t, var(--accent)) 13%, transparent);
  stroke: none;
}

.d-curve-dot {
  fill: var(--t, var(--accent));
  stroke: var(--paper-raised);
  stroke-width: 1.2;
}

.d-curve-label {
  fill: var(--ink-faint);
  font-family: var(--font-sans);
  font-size: 7px;
  font-weight: 700;
}

/* -- operation list -------------------------------------------------------- */

.d-ops {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.d-ops > li {
  display: flex;
  min-height: 36px;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: var(--paper-soft);
  gap: 8px;
}

.d-ops > li > div {
  min-width: 0;
}

.d-ops code {
  display: block;
  color: var(--ink);
  line-height: 1.45;
  overflow-wrap: break-word;
}

.d-ops small {
  display: block;
  margin-top: 2px;
  color: var(--ink-faint);
  font-size: 8.5px;
}

/* -- tiles ----------------------------------------------------------------- */

.d-tiles {
  display: grid;
  grid-template-columns: repeat(var(--cols, 4), minmax(0, 1fr));
  gap: 8px;
}

.d-tiles.cols-2 { --cols: 2; }
.d-tiles.cols-3 { --cols: 3; }
.d-tiles.cols-4 { --cols: 4; }
.d-tiles.cols-5 { --cols: 5; }
.d-tiles.cols-6 { --cols: 6; }
.d-tiles.cols-7 { --cols: 7; }

.d-tile {
  display: flex;
  min-width: 0;
  flex-direction: column;
  align-items: center;
  padding: 11px 8px 10px;
  border: 1px solid var(--t-line, var(--line));
  border-radius: 10px;
  background: var(--t-soft, var(--paper-raised));
  gap: 3px;
  text-align: center;
}

.d-tile-art {
  display: flex;
  width: 100%;
  height: 46px;
  align-items: center;
  justify-content: center;
  margin-bottom: 4px;
}

.d-tile-art .d-matrix {
  max-width: 46px;
  max-height: 46px;
}

.d-tile strong {
  color: var(--t, var(--ink));
  font-size: 11px;
  line-height: 1.25;
}

.d-tile span {
  color: var(--ink-faint);
  font-size: 8.5px;
  line-height: 1.4;
}

@media (max-width: 900px) {
  .d-tiles.cols-5,
  .d-tiles.cols-6,
  .d-tiles.cols-7 {
    --cols: 4;
  }
}

@media (max-width: 620px) {
  .d-tiles:not(.cols-2) {
    --cols: 3;
  }
}

@media (max-width: 420px) {
  .d-tiles {
    --cols: 2;
  }
}

/* -- legend / note / block ------------------------------------------------- */

.d-legend {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  color: var(--ink-faint);
  font-size: 9px;
  gap: 6px 16px;
}

.d-legend-item {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.d-legend-item i {
  width: 9px;
  height: 9px;
  border-radius: 3px;
  background: var(--t, var(--accent));
}

.d-note {
  color: var(--ink-soft);
  font-size: 10px;
  line-height: 1.65;
}

.d-block {
  display: flex;
  flex-direction: column;
  padding: 9px 11px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper-soft);
  gap: 2px;
}

.d-block[class*="tone-"] {
  border-color: var(--t-line);
  background: var(--t-soft);
}

.d-block strong {
  font-size: 10px;
}

.d-block code {
  color: var(--ink-soft);
}

/* Panels stay readable when primitives nest inside them. */
.d-panel :is(.d-rail, .d-stack, .d-formula, .d-bars, .d-table) {
  padding: 10px 12px;
}

/* A nested formula has no room for a horizontal layout — stack it instead. */
.d-panel .d-formula {
  flex-direction: column;
  /* Must be nowrap: a wrapping column container overflows into extra columns. */
  flex-wrap: nowrap;
  justify-content: flex-start;
  gap: 4px;
}

.d-panel .d-formula-term {
  width: 100%;
}

/* Nested terms must wrap; only a full-width formula may keep one line. */
.d-panel .d-formula-term strong {
  font-size: 15px;
  white-space: normal;
  overflow-wrap: break-word;
}

.d-panel .d-formula > p {
  margin-top: 4px !important;
}

/* Bars nested in a panel lose their label and result columns. */
.d-panel .d-bars,
.d-panel .d-bars.no-label,
.d-panel .d-bars.no-aside {
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.d-panel .d-bars-result {
  display: none;
}

.d-panel .d-bars-track > div {
  grid-template-columns: minmax(0, 1.1fr) minmax(30px, 1fr) 30px;
  gap: 6px;
}

/* Nested tables shed their padding so the columns keep their width. */
.d-panel .d-table {
  padding: 0;
}

.d-panel .d-row > span {
  padding: 7px 8px;
  font-size: 9px;
}

.d-panel .d-steps::before {
  left: 19px;
}

/* ==========================================================================
   3. Responsive
   ========================================================================== */

@media (max-width: 900px) {
  .d-cols.cols-4,
  .d-cols.cols-5,
  .d-cols.cols-6 {
    --cols: 3;
  }
}

@media (max-width: 760px) {
  .native-diagram {
    margin-right: -5px;
    margin-left: -5px;
    padding: 22px;
    border-radius: 14px;
  }

  .diagram-heading {
    display: block;
  }

  .diagram-heading > p {
    max-width: none;
    margin-top: 13px !important;
  }

  .d-cols.cols-3,
  .d-cols.cols-4,
  .d-cols.cols-5,
  .d-cols.cols-6 {
    --cols: 2;
  }

  .d-split {
    grid-template-columns: minmax(0, 1fr);
  }

  .d-transform {
    min-height: 66px;
  }

  .d-transform .d-arrow {
    transform: rotate(90deg);
  }

  .d-stats {
    grid-auto-flow: row;
    grid-template-columns: 1fr 1fr;
  }

  .d-stats > div {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .d-stats > div:nth-child(odd) {
    border-right: 1px solid var(--line);
  }

  .d-stats > div.d-stat-note {
    grid-column: 1 / -1;
    border-right: 0;
  }

  .d-bars,
  .d-bars.no-label,
  .d-bars.no-aside {
    grid-template-columns: 96px minmax(0, 1fr);
  }

  .d-bars-result {
    display: none;
  }

  .d-rail .d-arrow {
    width: 24px;
  }

  .d-node {
    padding: 7px 8px;
  }

  .d-node strong {
    font-size: 15px;
  }

  .d-callout {
    grid-template-columns: minmax(0, 1fr);
    gap: 8px;
  }
}

@media (max-width: 560px) {
  .native-diagram {
    margin-right: -10px;
    margin-left: -10px;
    padding: 18px 14px;
  }

  .d-cols:not(.cols-1) {
    --cols: 1;
  }

  .d-rail {
    padding: 12px;
  }

  .d-rail-track {
    flex-direction: column;
  }

  .d-rail .d-arrow {
    width: 26px;
    transform: rotate(90deg);
  }

  .d-node {
    flex: 1 1 auto;
  }

  .d-stats {
    grid-template-columns: 1fr;
  }

  .d-stats > div,
  .d-stats > div:nth-child(odd) {
    border-right: 0;
  }

  .d-bars,
  .d-bars.no-label,
  .d-bars.no-aside {
    grid-template-columns: minmax(0, 1fr);
  }

  .d-bars-label {
    margin-bottom: 4px;
  }

  .d-bars-track > div {
    grid-template-columns: minmax(70px, 1fr) minmax(50px, 1fr) 30px;
  }

  .d-layer {
    grid-template-columns: 46px minmax(0, 1fr);
    gap: 8px;
  }

  .d-repeat {
    margin-left: 52px;
  }

  /* Compact tables scroll rather than crush their columns. */
  .d-table {
    overflow-x: auto;
  }

  .d-row {
    min-width: 420px;
  }
}

/* ==========================================================================
   4. Per-diagram geometry
   ========================================================================== */

/* Muon — singular-spectrum shaping and NS sufficiency diagnostics. */
.diagram-muon .muon-spectrum-pair {
  display: grid;
  align-items: center;
  grid-template-columns: minmax(0, 1fr) 24px minmax(0, 1fr);
  gap: 8px;
}

.diagram-muon .muon-spectrum-arrow {
  width: 24px;
}

.diagram-muon .muon-spectrum {
  min-width: 0;
}

.diagram-muon .muon-spectrum > small {
  display: block;
  margin-bottom: 7px;
  color: var(--t);
  font-size: 7px;
  font-weight: 820;
  letter-spacing: 0.08em;
}

.diagram-muon .muon-spectrum > div {
  display: flex;
  height: 68px;
  align-items: end;
  padding: 8px 7px 5px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    repeating-linear-gradient(to top, transparent 0 15px, color-mix(in srgb, var(--line) 70%, transparent) 15px 16px),
    var(--paper-soft);
  gap: 4px;
}

.diagram-muon .muon-spectrum i {
  width: 100%;
  height: var(--value);
  min-height: 2px;
  border-radius: 3px 3px 1px 1px;
  background: color-mix(in srgb, var(--t) 78%, transparent);
}

.diagram-muon .muon-panel-note {
  color: var(--ink-soft);
  font-size: 9px;
  line-height: 1.55;
}

.diagram-muon .muon-diagnostic-pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 7px;
}

.diagram-muon .muon-diagnostic-pair > span {
  display: flex;
  min-width: 0;
  flex-direction: column;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--paper-soft);
}

.diagram-muon .muon-diagnostic-pair small {
  color: var(--ink-faint);
  font-size: 7px;
  font-weight: 820;
  letter-spacing: 0.08em;
}

.diagram-muon .muon-diagnostic-pair strong {
  margin: 2px 0;
  color: var(--d-green);
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.2;
}

.diagram-muon .muon-diagnostic-pair em {
  color: var(--ink-faint);
  font-size: 8.5px;
  font-style: normal;
}

.diagram-muon .d-callout code {
  color: var(--d-rose);
  font-weight: 700;
}

@media (max-width: 560px) {
  .diagram-muon .muon-spectrum-pair {
    grid-template-columns: minmax(0, 1fr);
  }

  .diagram-muon .muon-spectrum-arrow {
    transform: rotate(90deg);
  }
}

/* Gram Newton–Schulz — lower-triangle SYRK schedule illustration. */
.diagram-gram .syrk-strip {
  display: grid;
  align-items: center;
  grid-template-columns: 132px minmax(0, 1fr) 96px;
  gap: 20px;
}

.diagram-gram .syrk-visual {
  display: flex;
  align-items: center;
  gap: 9px;
}

.diagram-gram .syrk-visual .d-matrix {
  width: 70px;
  flex: 0 0 70px;
}

.diagram-gram .syrk-visual > span {
  color: var(--ink-soft);
  font-size: 9px;
}

.diagram-gram .syrk-visual strong {
  color: var(--d-green);
  font-size: 11px;
}

.diagram-gram .syrk-stat {
  text-align: right;
}

.diagram-gram .syrk-stat :is(strong, span) {
  display: block;
}

.diagram-gram .syrk-stat strong {
  color: var(--d-green);
  font-family: var(--font-serif);
  font-size: 30px;
  line-height: 1;
}

.diagram-gram .syrk-stat span {
  margin-top: 4px;
  color: var(--ink-faint);
  font-size: 8px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.diagram-gram .loop-bracket {
  height: 26px;
  margin: 8px 6px 0;
  border: 1px dashed var(--line-strong);
  border-bottom: 0;
  border-radius: 8px 8px 0 0;
  text-align: center;
}

.diagram-gram .loop-bracket span {
  position: relative;
  top: -9px;
  padding: 0 7px;
  color: var(--ink-faint);
  background: var(--paper-raised);
  font-size: 8px;
  font-weight: 750;
}

.diagram-gram .cost-line {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-top: auto;
  padding-top: 11px;
  border-top: 1px solid var(--line);
}

.diagram-gram .cost-line span {
  color: var(--ink-faint);
  font-size: 9px;
}

.diagram-gram .cost-line strong {
  font-family: var(--font-serif);
  font-size: 16px;
}

.diagram-gram .cost-line.is-good strong {
  color: var(--accent);
}

/* RoPE — unit-circle dial showing that only the angle gap survives. */
.diagram-rope .rope-dial-wrap {
  display: flex;
  justify-content: center;
  padding: 4px 0 2px;
}

.rope-dial {
  width: 148px;
  height: auto;
  overflow: visible;
}

.rope-dial .dial-ring {
  fill: color-mix(in srgb, var(--d-blue) 6%, transparent);
  stroke: color-mix(in srgb, var(--d-blue) 40%, var(--line));
  stroke-width: 1;
}

.rope-dial .dial-axis {
  fill: none;
  stroke: var(--line);
  stroke-dasharray: 2 3;
  stroke-width: 0.8;
}

.rope-dial .dial-sweep {
  fill: none;
  stroke: var(--accent);
  stroke-width: 3;
}

.rope-dial .dial-vector {
  fill: none;
  stroke-linecap: round;
  stroke-width: 2;
}

.rope-dial .dial-vector.is-q { stroke: var(--d-blue); }
.rope-dial .dial-vector.is-k { stroke: var(--d-violet); }
.rope-dial .dial-hub { fill: var(--ink-soft); }

.rope-dial .dial-label {
  font-family: var(--font-sans);
  font-size: 7.5px;
  font-weight: 780;
}

.rope-dial .dial-label.is-q { fill: var(--d-blue); }
.rope-dial .dial-label.is-k { fill: var(--d-violet); text-anchor: end; }
.rope-dial .dial-label.is-gap { fill: var(--accent); text-anchor: middle; }

/* DeepSeek-V4 — router scoring curves sit above their bullet list. */
.diagram-dsv4 .score-plot {
  display: flex;
  justify-content: center;
  padding: 2px 0 6px;
}

.diagram-dsv4 .score-plot .d-curve {
  max-width: 230px;
}

/* Foundations — shared plot / matrix wrappers. */
.schedule-plot,
.mask-visual,
.patch-visual {
  display: flex;
  justify-content: center;
  padding: 2px 0 6px;
}

.mask-visual .d-matrix,
.patch-visual .d-matrix {
  max-width: 132px;
}

/* Grouped GEMM — token rows coloured by owning expert. */
.diagram-ggemm .gg-cell {
  align-items: center;
  gap: 6px;
  text-align: center;
}

.diagram-ggemm .gg-cell .d-matrix {
  max-width: 100%;
}

.diagram-ggemm .route-strip {
  width: 22px;
  max-width: 22px;
}

.diagram-ggemm .gg-cell .d-matrix:not(.route-strip) {
  width: 56px;
  max-width: 56px;
}

/* Packed sequence — the 8-token doc split into 2·CP chunks. */
.diagram-packed .ring-split {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.diagram-packed .ring-split .d-matrix {
  max-width: 100%;
}

.diagram-packed .ring-split-scale {
  display: grid;
  color: var(--ink-faint);
  font-size: 7.5px;
  font-weight: 780;
  grid-template-columns: repeat(4, 1fr);
  letter-spacing: 0.06em;
  text-align: center;
}

/* Megatron parallelism — the two RankGenerator equations. */
.diagram-parallelism .path-equation {
  padding: 12px 14px;
  border-radius: 9px;
  background: color-mix(in srgb, var(--t) 10%, transparent);
  font-family: var(--font-serif);
  font-size: 17px;
  text-align: center;
}

.diagram-parallelism .path-equation b {
  color: var(--t);
  font-weight: 700;
}

.diagram-parallelism .path-equation code {
  color: var(--ink-faint);
  font-size: 11px;
}

/* Kernel equivalence gates — the rail that threads the three gate cards. */
.diagram-gates .gates-stage {
  position: relative;
  margin-top: 14px;
  padding-top: 20px;
}

.diagram-gates .gate-rail {
  position: absolute;
  z-index: 0;
  top: 1px;
  left: 0;
  width: 100%;
  height: 38px;
  overflow: visible;
  fill: var(--paper-raised);
  stroke: var(--line-strong);
  stroke-width: 1.5;
}

.diagram-gates .gates-stage > .d-cols {
  position: relative;
  z-index: 1;
  margin-top: 0;
}

.diagram-gates .d-panel {
  min-height: 340px;
}

.diagram-gates .gate-question {
  display: grid;
  min-height: 82px;
  align-content: center;
  justify-items: start;
  padding: 11px;
  border: 1px solid color-mix(in srgb, var(--t) 20%, var(--line));
  border-radius: 8px;
  background: color-mix(in srgb, var(--paper-raised) 78%, transparent);
  gap: 2px;
}

.diagram-gates .gate-question small {
  color: var(--ink-faint);
  font-size: 7px;
  font-weight: 800;
  letter-spacing: 0.1em;
}

.diagram-gates .gate-question strong {
  overflow: hidden;
  max-width: 100%;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 10px;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.diagram-gates .gate-question > span {
  color: var(--t);
  font-size: 9px;
  font-weight: 750;
}

.diagram-gates .gate-criteria {
  flex: 1;
  padding: 2px 2px 12px;
}

.diagram-gates .gate-criteria p {
  margin-bottom: 8px !important;
  color: var(--ink);
  font-size: 10px;
  font-weight: 720;
}

.diagram-gates .gate-criteria > code {
  display: block;
  margin: 4px 0;
  color: var(--ink-soft);
}

.diagram-gates .gate-criteria > small {
  display: block;
  margin-top: 8px;
  color: var(--ink-faint);
  font-size: 8px;
}

.diagram-gates .gate-criteria ul {
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.diagram-gates .gate-criteria li {
  position: relative;
  padding-left: 12px;
  color: var(--ink-soft);
  font-family: var(--font-mono);
  font-size: 9px;
}

.diagram-gates .gate-criteria li::before {
  position: absolute;
  top: 6px;
  left: 0;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--t);
  content: "";
}

.diagram-gates .gate-verdict {
  display: flex;
  min-height: 46px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 8px;
  border: 1px solid var(--verdict-color);
  border-radius: 8px;
  color: var(--verdict-color);
  background: color-mix(in srgb, var(--verdict-color) 8%, var(--paper-raised));
  text-align: center;
}

.diagram-gates .verdict-fail { --verdict-color: var(--d-danger); }
.diagram-gates .verdict-scale { --verdict-color: var(--d-amber); }

.diagram-gates .gate-verdict span { font-size: 7px; }
.diagram-gates .gate-verdict strong { font-size: 10px; letter-spacing: 0.04em; }

.diagram-gates .status-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
}

.diagram-gates .status-dot.warn { background: var(--d-amber); }
.diagram-gates .status-dot.fail { background: var(--d-danger); }

.diagram-gates .release-routing {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.diagram-gates .release-routing > div {
  display: grid;
  align-items: center;
  padding: 7px 9px;
  border-radius: 7px;
  background: color-mix(in srgb, var(--paper-raised) 70%, transparent);
  grid-template-columns: 8px 1fr;
  gap: 0 6px;
}

.diagram-gates .release-routing small {
  grid-column: 2;
  color: var(--ink-faint);
  font-size: 7px;
}

.diagram-gates .release-routing strong {
  color: var(--ink);
  font-size: 9px;
}

@media (max-width: 760px) {
  .diagram-gram .syrk-strip {
    grid-template-columns: 120px minmax(0, 1fr);
  }

  .diagram-gram .syrk-stat {
    display: none;
  }

  .diagram-gates .gate-rail {
    display: none;
  }

  .diagram-gates .gates-stage {
    padding-top: 0;
  }

  .diagram-gates .d-panel {
    min-height: 0;
  }
}

@media (max-width: 560px) {
  .diagram-gram .syrk-strip {
    grid-template-columns: minmax(0, 1fr);
  }

  .diagram-gates .release-routing {
    grid-template-columns: 1fr;
  }
}

/* Megatron parallelism — "what gets split" tiles. */
.diagram-parallelism .d-tile-art .d-matrix {
  max-width: 42px;
  max-height: 42px;
}

.diagram-parallelism .split-replica {
  display: flex;
  align-items: center;
  gap: 4px;
}

.diagram-parallelism .split-replica .d-matrix {
  max-width: 26px;
}

/* LoRA — frozen weight plus the trainable low-rank pair. */
.lora-decomp {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--paper-raised);
  gap: 14px;
}

.lora-decomp > div {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
}

.lora-decomp small {
  color: var(--ink-faint);
  font-size: 7.5px;
  font-weight: 820;
  letter-spacing: 0.1em;
}

.lora-decomp span {
  color: var(--ink-faint);
  font-size: 9px;
}

.lora-decomp .d-matrix {
  max-width: 62px;
}

.lora-pair {
  display: flex;
  align-items: center;
  gap: 5px;
}

.lora-pair .d-matrix:first-child { max-width: 16px; }
.lora-pair .d-matrix:last-child { max-width: 62px; }

.lora-decomp > em {
  color: var(--ink-faint);
  font-family: var(--font-serif);
  font-size: 17px;
  font-style: normal;
}

.lora-decomp .lora-note {
  max-width: 190px;
  align-items: flex-start;
  padding-left: 14px;
  border-left: 1px solid var(--line);
  text-align: left;
}

.lora-decomp .lora-note strong {
  color: var(--accent);
  font-size: 12px;
}

@media (max-width: 620px) {
  .lora-decomp {
    flex-wrap: wrap;
  }

  .lora-decomp .lora-note {
    max-width: none;
    padding-left: 0;
    border-left: 0;
    border-top: 1px solid var(--line);
    padding-top: 10px;
    width: 100%;
  }
}