@import url('./tokens/reader.css?v=1');

/* A continuous reading canvas. .reader-page owns the only outer gutter. */
.reader-page {
  inline-size: 100%;
  max-inline-size: calc(var(--reader-technical) + var(--reader-gutter) * 2);
  margin-inline: auto;
  padding: clamp(1.75rem, 4vw, 3.5rem) var(--reader-gutter) 8rem;
  color: var(--reader-ink);
  background: var(--reader-canvas);
  font-size: var(--reader-body);
  line-height: var(--reader-leading);
  overflow-wrap: anywhere;
  animation: none;
}
.reader-page .doc__body {
  min-inline-size: 0;
  inline-size: 100%;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  box-shadow: none;
  color: var(--reader-ink);
  font-size: inherit;
  line-height: inherit;
}
.reader-page ::selection,
:is(.reader-code-dialog, .reader-copy-fallback) ::selection {
  color: var(--reader-selection-ink);
  background: var(--reader-selection);
}
.reader-page :focus-visible,
:is(.reader-code-dialog, .reader-copy-fallback) :focus-visible {
  outline: 2px solid var(--reader-focus);
  outline-offset: 3px;
}
.reader-page .runninghead {
  flex-wrap: wrap;
  align-items: center;
  column-gap: 1rem;
  row-gap: .5rem;
  margin-block-end: 1.625rem;
  padding-block-end: 1rem;
  border-color: var(--reader-border);
}
.reader-page .runninghead .eyebrow {
  min-inline-size: 0;
  color: var(--reader-muted);
  font-family: var(--font-body);
  font-size: var(--reader-small);
  font-weight: 500;
  line-height: 1.5;
  letter-spacing: 0;
  text-transform: none;
  overflow-wrap: anywhere;
}
.reader-page .runninghead > :last-child { flex-shrink: 0; font-variant-numeric: tabular-nums; }
.reader-page .doc__title {
  max-inline-size: 25ch;
  margin-block: 0 1rem;
  font-size: calc(clamp(1.875rem, 1.45rem + 1.5vw, 2.625rem) * var(--reader-scale));
  line-height: 1.18;
  font-weight: 700;
  letter-spacing: -.025em;
  color: var(--reader-heading);
  overflow-wrap: anywhere;
  text-wrap: balance;
}
.reader-page .doc__standfirst {
  max-inline-size: var(--reader-prose);
  margin-block: 0 1.5rem;
  color: var(--reader-muted);
  font-size: calc(clamp(1.125rem, 1.02rem + .35vw, 1.3125rem) * var(--reader-scale));
  font-weight: 400;
  line-height: 1.65;
  text-wrap: pretty;
}

.reader-page .reader-load-notice {
  max-inline-size: var(--reader-prose);
  margin-block: 1rem 1.5rem;
  padding: 1rem;
  color: var(--reader-ink);
  background: var(--reader-surface);
  border: 1px solid var(--reader-border);
  border-inline-start: 3px solid var(--reader-warning);
  border-radius: .5rem;
  font-size: 1rem;
  line-height: 1.6;
}
.reader-page .reader-load-notice button { display: inline-flex; align-items: center; justify-content: center; min-block-size: 2.75rem; margin-inline-start: .5rem; padding: .375rem .75rem; border: 1px solid var(--reader-control-border); border-radius: .375rem; color: var(--reader-heading); font: inherit; }

/* Body hierarchy and rhythm. Technical examples may use the wider canvas. */
.reader-page .doc__body :is(p, ul, ol, h2, h3, h4, h5, h6, blockquote, .aside, .figref) {
  max-inline-size: var(--reader-prose);
}
.reader-page .doc__body p {
  margin-block: 0 1.1em;
  color: inherit;
  line-height: inherit;
  text-wrap: pretty;
}
.reader-page .doc__body :is(h2, h3, h4, h5, h6) {
  color: var(--reader-heading);
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -.018em;
  line-height: 1.3;
  text-wrap: pretty;
  overflow-wrap: anywhere;
  scroll-margin-block-start: calc(var(--bar-h) + 1.5rem);
}
.reader-page .doc__body h2 { font-size: calc(clamp(1.5rem, 1.38rem + .4vw, 1.875rem) * var(--reader-scale)); margin-block: 2.5em .75em; }
.reader-page .doc__body h3 { font-size: calc(clamp(1.3125rem, 1.23rem + .25vw, 1.5rem) * var(--reader-scale)); margin-block: 2em .65em; }
.reader-page .doc__body h4 { font-size: calc(clamp(1.1875rem, 1.15rem + .1vw, 1.25rem) * var(--reader-scale)); margin-block: 1.75em .6em; }
.reader-page .doc__body :is(h5, h6) { font-size: 1em; margin-block: 1.5em .5em; }
.reader-page .doc__body strong { color: var(--reader-heading); font-weight: 650; }
.reader-page .doc__body a:not(.reader-action) {
  color: var(--reader-link);
  font-weight: 500;
  text-decoration: underline;
  text-decoration-thickness: .065em;
  text-underline-offset: .18em;
  text-decoration-skip-ink: auto;
  overflow-wrap: anywhere;
}
.reader-page .doc__body a:not(.reader-action):hover { text-decoration-thickness: .12em; }
.reader-page .doc__body :is(ul, ol) {
  margin-block: 0 1.2em;
  padding-inline-start: 1.4em;
  padding-inline-end: 0;
  list-style-position: outside;
}
.reader-page .doc__body ul { list-style-type: disc; }
.reader-page .doc__body ol { list-style-type: decimal; counter-reset: none; }
.reader-page .doc__body :is(ul, ol) > li {
  padding-inline-start: .25em;
  margin-block: .35em .6em;
  line-height: inherit;
  counter-increment: none;
}
.reader-page .doc__body :is(ul, ol) > li::before { content: none; }
.reader-page .doc__body li::marker { color: var(--reader-muted); font-size: .95em; }
.reader-page .doc__body li > :is(ul, ol) { margin-block: .5em 0; }
.reader-page .doc__body li > p { margin-block-end: .5em; }
.reader-page .doc__body :not(pre) > code {
  padding: .08em .3em;
  border-radius: .25rem;
  color: var(--reader-heading);
  background: var(--reader-surface-hover);
  font-family: var(--reader-code-font);
  font-size: .9em;
  font-variant-ligatures: none;
  font-feature-settings: 'liga' 0, 'calt' 0;
  overflow-wrap: anywhere;
  white-space: normal;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
}

/* Reading stays quiet until a copy session is explicitly enabled. */
.reader-page [hidden],
.reader-code-dialog [hidden],
.reader-copy-fallback [hidden] { display: none !important; }
.reader-page .reader-copy-unit { position: relative; }
.reader-page[data-copy-mode="true"] .reader-copy-unit,
.reader-page .reader-copy-unit:is([data-reader-kind="code"], [data-reader-kind="output"], [data-reader-kind="callout"]) { min-block-size: var(--reader-action-size); }
.reader-page .reader-copy-unit:is(p, h1, h2, h3, h4, h5, h6, figcaption, .figref) { display: flow-root; }
.reader-page .reader-unit-actions {
  display: inline-flex;
  align-items: center;
  justify-content: flex-end;
  gap: .125rem;
  float: inline-end;
  margin-inline-start: .5rem;
  margin-block-start: -.1875rem;
  margin-block-end: -.125rem;
}
:is(.reader-page, .reader-code-dialog, .reader-copy-fallback) :is(.reader-copy, .reader-select, .reader-action, .reader-preference-option, .reader-reset, .reader-code-tools button, .reader-table-tools button, .reader-math-tools button, .reader-dialog-header button, .reader-toolbar button) {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  gap: .45rem;
  min-inline-size: var(--reader-action-size);
  min-block-size: var(--reader-action-size);
  padding: .5rem .75rem;
  border: 1px solid transparent;
  border-radius: .45rem;
  color: var(--reader-icon);
  background: transparent;
  font-family: var(--font-body);
  font-size: .875rem;
  font-weight: 550;
  line-height: 1.35;
  letter-spacing: 0;
  text-transform: none;
  text-decoration: none;
  cursor: pointer;
  touch-action: manipulation;
  transition: background-color 120ms ease, color 120ms ease, border-color 120ms ease;
}
:is(.reader-page, .reader-code-dialog, .reader-copy-fallback) :is(.reader-copy, .reader-select) {
  inline-size: var(--reader-action-size);
  padding: .7rem;
  opacity: 1;
  visibility: visible;
}
:is(.reader-page, .reader-code-dialog, .reader-copy-fallback) :is(.reader-copy, .reader-select, .reader-action, .reader-preference-option, .reader-reset, .reader-code-tools button, .reader-table-tools button, .reader-math-tools button, .reader-dialog-header button, .reader-toolbar button):hover {
  color: var(--reader-heading);
  background: var(--reader-surface-hover);
}
:is(.reader-page, .reader-code-dialog, .reader-copy-fallback) :is(.reader-copy, .reader-select) svg,
:is(.reader-page, .reader-code-dialog, .reader-copy-fallback) .reader-action svg {
  inline-size: 1.125rem;
  block-size: 1.125rem;
  flex: none;
  pointer-events: none;
}
:is(.reader-page, .reader-code-dialog, .reader-copy-fallback) .reader-copy[data-state="copied"] { color: var(--reader-success); background: var(--reader-surface-hover); }
.reader-page .reader-section-tools { display: inline-flex; justify-content: flex-end; align-self: flex-start; flex: none; gap: .25rem; margin: 0; }
.reader-page .reader-section-tools button { font-size: .8125rem; }
:is(.reader-page, .reader-code-dialog, .reader-copy-fallback) .reader-copy.reader-copy-labeled { inline-size: auto; padding: .5rem .625rem; }
.reader-page .reader-block-tools { display: flex; justify-content: flex-end; align-items: center; min-block-size: var(--reader-action-size); margin-block: -.375rem .375rem; }
.reader-page summary > .reader-block-tools { flex: none; margin: 0 0 0 auto; }
.reader-page .reader-control-icon { flex: none; }
.reader-page :is(.reader-unit-actions, .reader-toolbar, .reader-block-tools, .reader-code-tools, .reader-table-tools, .reader-math-tools, .reader-section-tools) {
  -webkit-user-select: none;
  user-select: none;
}
.reader-page .reader-select { border-color: var(--reader-border); }
.reader-page .reader-select .reader-select-mark { visibility: hidden; }
.reader-page .reader-select[aria-checked="true"] .reader-select-mark { visibility: visible; }
.reader-page .reader-select[aria-checked="true"] {
  color: var(--reader-link);
  border-color: var(--reader-link);
  background: var(--reader-surface-hover);
}
.reader-page .reader-select:is(:disabled, [aria-disabled="true"]) { color: var(--reader-muted); border-style: dashed; cursor: default; }
.reader-page[data-copy-mode="true"] [data-reader-selected="true"] {
  border-radius: .25rem;
  background-color: color-mix(in srgb, var(--reader-selection) 38%, var(--reader-canvas));
  box-shadow: inset 0 0 0 2px var(--reader-link);
}
.reader-page[data-copy-mode="true"] [data-reader-covered="true"] {
  background-color: color-mix(in srgb, var(--reader-selection) 14%, transparent);
  box-shadow: none;
}
.reader-page[data-copy-mode="true"] [data-reader-selected="true"] .reader-select[aria-checked="true"] { background: var(--reader-canvas); }


/* Lesson toolbar and compact, locally stored reading preferences. */
.reader-page .reader-toolbar {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: .375rem;
  margin-block: 0 1.75rem;
  padding-block: .5rem;
  border-block: 1px solid var(--reader-border);
}
.reader-page .reader-toolbar-actions { display: flex; align-items: center; flex-wrap: wrap; gap: .5rem; }
.reader-page .reader-toolbar-actions > button { border-color: var(--reader-border); }
.reader-page .reader-toolbar-actions > button[aria-expanded="true"] { color: var(--reader-link); border-color: var(--reader-control-border); background: var(--reader-surface); }
.reader-page[data-copy-mode="true"] .reader-toolbar {
  position: sticky;
  z-index: 50;
  inset-block-start: var(--bar-h);
  background: var(--reader-canvas);
  box-shadow: 0 .375rem .75rem #0000000a;
}
.reader-page .reader-toolbar-actions > button[aria-pressed="true"] { color: var(--reader-link); border-color: var(--reader-link); background: var(--reader-surface); }
.reader-page .reader-copy-session {
  display: flex;
  flex: 1 1 100%;
  flex-wrap: wrap;
  align-items: center;
  gap: .25rem .5rem;
  min-inline-size: 0;
  padding-block-start: .5rem;
  border-block-start: 1px solid var(--reader-border);
}
.reader-page .reader-selection-count { color: var(--reader-heading); font-size: .875rem; font-weight: 650; white-space: nowrap; }
.reader-page .reader-selection-hint { order: 1; flex: 1 1 13rem; color: var(--reader-muted); font-size: .8125rem; line-height: 1.45; }
.reader-page .reader-selection-actions { order: 2; display: flex; flex-wrap: wrap; align-items: center; gap: .375rem; margin-inline-start: auto; }
.reader-page .reader-copy-session :is(p, span) { margin: 0; }
.reader-page .reader-copy-session button { border-color: var(--reader-border); }
.reader-page .reader-copy-session button[data-reader-action="copy-selected"] { color: var(--reader-selection-ink); background: var(--reader-selection); border-color: var(--reader-control-border); }
.reader-page .reader-copy-session button:disabled { color: var(--reader-muted); background: var(--reader-surface); border-color: var(--reader-border); cursor: default; opacity: .7; }
.reader-page .reader-preferences {
  position: absolute;
  z-index: 15;
  inset-block-start: calc(100% + .5rem);
  inset-inline-end: 0;
  inline-size: min(23rem, 100%);
  padding: 1.25rem;
  color: var(--reader-ink);
  background: var(--reader-canvas);
  border: 1px solid var(--reader-control-border);
  border-radius: var(--reader-radius);
  box-shadow: 0 .5rem 2rem #0000001a;
  font-size: 1rem;
  line-height: 1.5;
}
.reader-page .reader-preferences[hidden] { display: none; }
.reader-page .reader-preferences .reader-preferences-title { color: var(--reader-heading); font-weight: 650; margin-block-end: 1.125rem; }
.reader-page .reader-preferences-footer { display: flex; justify-content: space-between; gap: .5rem; border-block-start: 1px solid var(--reader-border); padding-block-start: .75rem; }
.reader-page .reader-preferences-done { border-color: var(--reader-control-border); color: var(--reader-heading); }
.reader-page .reader-preferences-toggle .reader-action-label { font-family: var(--font-display); font-size: 1.125rem; font-weight: 650; }

.reader-page .reader-preferences :is(h2, h3, p) { margin-block: 0 .75rem; font-size: 1rem; line-height: 1.5; }
.reader-page .reader-preferences fieldset { min-inline-size: 0; margin: 0 0 1rem; padding: 0; border: 0; }
.reader-page .reader-preferences legend { padding: 0; margin-block-end: .375rem; color: var(--reader-muted); font-size: .875rem; font-weight: 550; }
.reader-page .reader-preferences fieldset > div { display: flex; flex-wrap: wrap; gap: .25rem; }
.reader-page .reader-preferences .reader-preference-option { flex: 1 1 auto; border-color: var(--reader-border); color: var(--reader-ink); }
.reader-page .reader-preferences .reader-preference-option[aria-pressed="true"] { color: var(--reader-link); border-color: var(--reader-control-border); background: var(--reader-surface-hover); font-weight: 650; }
.reader-page .reader-preferences :is(.reader-reset, .reader-preferences-reset) { color: var(--reader-muted); text-decoration: underline; text-underline-offset: .18em; padding-inline: .25rem; }

/* Familiar editor frames, with shared controls outside the scroll surface. */
.reader-page .doc__body :is(.codeframe, .reader-code-block) {
  max-inline-size: 100%;
  margin-block: 1.5rem;
  overflow: hidden;
  border: 1px solid var(--reader-border);
  border-radius: var(--reader-radius);
  background: var(--reader-surface);
}
:is(.reader-page, .reader-code-dialog) :is(.reader-code-tools, .reader-table-tools, .reader-math-tools) {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: .125rem;
  min-block-size: 3rem;
  padding: .125rem .375rem .125rem .875rem;
  color: var(--reader-muted);
  background: var(--reader-surface);
  border-block-end: 1px solid var(--reader-border);
  font-size: .8125rem;
  font-weight: 500;
  line-height: 1.5;
}
:is(.reader-page, .reader-code-dialog) :is(.reader-code-tools, .reader-table-tools, .reader-math-tools) > :is(span, strong, label):first-child {
  min-inline-size: 0;
  margin-inline-end: auto;
  overflow-wrap: anywhere;
}
:is(.reader-page, .reader-code-dialog) .reader-code-actions { display: flex; align-items: center; flex-wrap: wrap; gap: .125rem; }
:is(.reader-page, .reader-code-dialog) .reader-code-action[aria-pressed="true"] { color: var(--reader-link); border-color: var(--reader-control-border); background: var(--reader-surface-hover); }
.reader-page .codeframe__lang { position: static; color: var(--reader-muted); font-family: var(--font-body); font-size: .8125rem; font-weight: 550; letter-spacing: 0; text-transform: none; }
.reader-page .doc__body pre,
.reader-code-dialog pre {
  max-inline-size: 100%;
  margin-block: 1.5rem;
  padding: 1.125rem 1.25rem;
  overflow: auto;
  color: var(--reader-ink);
  background: var(--reader-surface);
  border: 1px solid var(--reader-border);
  border-radius: var(--reader-radius);
  box-shadow: none;
  font-family: var(--reader-code-font);
  font-size: var(--reader-code);
  line-height: 1.7;
  font-variant-ligatures: none;
  font-feature-settings: 'liga' 0, 'calt' 0;
  tab-size: 4;
  overflow-wrap: normal;
  white-space: pre;
}
.reader-page .doc__body pre code,
.reader-code-dialog pre code {
  padding: 0;
  color: inherit;
  background: transparent;
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  font-variant-ligatures: none;
  overflow-wrap: normal;
}
.reader-page .doc__body :is(.codeframe, .reader-code-block) > pre { margin: 0; border: 0; border-radius: 0; }
:is(.reader-page, .reader-code-dialog) .reader-code-wrap pre,
:is(.reader-page, .reader-code-dialog) .reader-code-wrap pre code { white-space: pre-wrap; overflow-wrap: anywhere; }
:is(.reader-page, .reader-code-dialog) .reader-code-wrap .ec-line .code { white-space: pre-wrap; overflow-wrap: anywhere; }
:is(.reader-page .doc__body, .reader-code-dialog) .expressive-code {
  margin: 0;
  --ec-codeFontFml: var(--reader-code-font);
  --ec-codeFontSize: var(--reader-code);
  --ec-codeLineHt: 1.7;
  --ec-codeBg: var(--reader-surface);
  --ec-codePadBlk: 1.125rem;
  --ec-codePadInl: 1.25rem;
  --ec-brdCol: transparent;
  --ec-brdRad: 0;
}
.reader-page .doc__body .expressive-code pre,
.reader-code-dialog .expressive-code pre { margin: 0; border: 0; border-radius: 0; padding: 0; }
:is(.reader-page .doc__body, .reader-code-dialog) .expressive-code pre > code { padding: 1.125rem 0; font-size: var(--reader-code); line-height: 1.7; font-family: var(--reader-code-font); }
.reader-page .doc__body .expressive-code .frame,
.reader-code-dialog .expressive-code .frame { margin: 0; border: 0; box-shadow: none; }
.reader-page .doc__body .reader-output { background: var(--reader-canvas); }
.reader-page .doc__body .reader-output .reader-code-tools { background: var(--reader-canvas); }

/* Mathematical notation remains notation, with local overflow when needed. */
.reader-page .doc__body .tex {
  display: inline;
  color: inherit;
  white-space: normal;
  overflow: visible;
  vertical-align: baseline;
}
.reader-page .doc__body .tex-block {
  max-inline-size: 100%;
  margin-block: 1.5rem;
  padding: 0;
  color: var(--reader-heading);
  background: var(--reader-canvas);
  border: 1px solid var(--reader-border);
  border-radius: var(--reader-radius);
  overflow: hidden;
}
.reader-page .reader-equation {
  position: relative;
  max-inline-size: 100%;
  margin-block: 1.5rem;
  border: 1px solid var(--reader-border);
  border-radius: var(--reader-radius);
  overflow: hidden;
  color: var(--reader-heading);
  background: var(--reader-canvas);
}
.reader-page .reader-equation .tex-block { margin: 0; border: 0; padding: 0; border-radius: 0; overflow: visible; }
.reader-page .reader-equation .tex-block > .katex-display { padding: 0; }
.reader-page .reader-math-tools { position: absolute; inset-block-start: .25rem; inset-inline-end: .25rem; min-block-size: var(--reader-action-size); padding: 0; background: transparent; border: 0; }
.reader-page .reader-math-content { max-inline-size: 100%; padding: 1.25rem 1rem; overflow-x: auto; overflow-y: hidden; }
.reader-page[data-copy-mode="true"] .reader-math-tools { position: static; padding: .125rem .375rem; background: var(--reader-surface); border-block-end: 1px solid var(--reader-border); }
.reader-page .tex-block > .katex-display { padding: 1.25rem 1rem; overflow-x: auto; overflow-y: hidden; }
.reader-page .tex-block .katex-display { margin: 0; }
.reader-page .katex { font-size: 1.05em; line-height: normal; }
.reader-page .doc__body .tex--raw { color: var(--reader-link); font-family: var(--reader-code-font); white-space: pre-wrap; overflow-wrap: anywhere; }

/* Tables keep legible type; only their intrinsic grid scrolls. */
.reader-page .doc__body .tablewrap {
  max-inline-size: 100%;
  margin-block: 1.5rem;
  overflow: hidden;
  border: 1px solid var(--reader-border);
  border-radius: var(--reader-radius);
  background: var(--reader-canvas);
}
.reader-page .reader-table-scroll { max-inline-size: 100%; overflow-x: auto; overscroll-behavior-inline: contain; }
.reader-page .doc__body .tablewrap table { inline-size: 100%; border-collapse: collapse; font-size: var(--reader-table); line-height: 1.65; }
.reader-page .doc__body .tablewrap :is(th, td) {
  min-inline-size: 11rem;
  padding: .875rem 1rem;
  color: var(--reader-ink);
  border-block-end: 1px solid var(--reader-border);
  vertical-align: top;
  text-align: start;
  white-space: normal;
  overflow-wrap: break-word;
  font-size: inherit;
  line-height: inherit;
}
.reader-page .doc__body .tablewrap th { color: var(--reader-heading); background: var(--reader-surface); font-weight: 650; }
.reader-page .doc__body .tablewrap td:first-child { color: var(--reader-heading); font-weight: 500; }
.reader-page .doc__body .tablewrap tr:last-child td { border-block-end: 0; }
.reader-page .doc__body .tablewrap :is(td, th):is([align="right"], .reader-align-right) { text-align: end; font-variant-numeric: tabular-nums; }
.reader-page .doc__body .tablewrap :is(td, th):is([align="center"], .reader-align-center) { text-align: center; }
.reader-page .doc__body .tablewrap td > p:last-child { margin-block-end: 0; }
.reader-page .doc__body .tablewrap .reader-copy { margin-inline-start: .25rem; }
.reader-page .doc__body .tablewrap .reader-unit-actions { display: flex; float: none; margin: 0 0 .375rem; }
.reader-page .doc__body .tablewrap table.cols-3 td:nth-child(n),
.reader-page .doc__body .tablewrap table.cols-4 td:nth-child(n) { width: auto; }
@media (hover: hover) and (pointer: fine) {
  .reader-page .doc__body .tablewrap tbody tr:hover td { background: var(--reader-surface); }
}

.reader-page .reader-columns { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 24rem), 1fr)); gap: 2rem; margin-block: 1.5rem; }
.reader-page .reader-column { min-inline-size: 0; }

/* Callouts and quotations carry emphasis without boxing every paragraph. */
.reader-page .doc__body .aside {
  margin-block: 1.5rem;
  padding: 1.125rem 1.25rem;
  border: 1px solid var(--reader-border);
  border-inline-start: 3px solid var(--reader-link);
  border-radius: 0 var(--reader-radius) var(--reader-radius) 0;
  color: var(--reader-ink);
  background: var(--reader-surface);
  font-size: inherit;
  line-height: inherit;
}
.reader-page .doc__body .aside::before { content: none; }
.reader-page .doc__body .reader-metadata { margin-block: 0 1.75rem; padding: .875rem 1rem; border-inline-start-width: 1px; border-radius: var(--reader-radius); }
.reader-page .doc__body .reader-metadata-essential { margin-block: 0; color: var(--reader-muted); font-size: max(1rem, var(--reader-small)); line-height: 1.65; font-weight: 500; }
.reader-page .reader-metadata .reader-disclosure { margin-block: .25rem 0; }
.reader-page .doc__body .reader-metadata .reader-disclosure > summary { display: flex; align-items: center; inline-size: 100%; min-block-size: var(--reader-action-size); padding: 0; border: 0; background: transparent; font-size: 1rem; }
.reader-page .reader-metadata .reader-disclosure > summary > .reader-block-tools { margin: 0; margin-inline-start: auto; }
.reader-page .reader-metadata .details__body { padding-inline-start: .75rem; font-size: max(1rem, var(--reader-small)); }

.reader-page .doc__body .aside--warn { border-inline-start-color: var(--reader-warning); }
.reader-page .doc__body .aside__icon { margin-inline-end: .625rem; }
.reader-page .doc__body :is(.aside__label, .reader-callout-label) { color: var(--reader-heading); font-size: .875rem; font-weight: 650; letter-spacing: 0; }
.reader-page .doc__body blockquote,
.reader-page .doc__body blockquote.quote {
  margin-block: 1.5rem;
  margin-inline: 0;
  padding: .375rem 0 .375rem 1.125rem;
  color: var(--reader-ink);
  border-inline-start: 2px solid var(--reader-control-border);
  font-size: inherit;
  font-weight: 400;
  line-height: inherit;
}
.reader-page .doc__body :is(blockquote, .aside) > p:last-child { margin-block-end: 0; }
.reader-page .doc__body .rule,
.reader-page .doc__body hr { margin-block: 2rem; border: 0; border-block-start: 1px solid var(--reader-border); }
.reader-page .doc__body .figref,
.reader-page .doc__body figcaption {
  margin-block: .875rem 1.5rem;
  padding: 0;
  border: 0;
  font-family: var(--font-body);
  font-size: var(--reader-small);
  color: var(--reader-muted);
  line-height: 1.65;
}
.reader-page .doc__body :is(.figure, .diagram) { max-inline-size: 100%; margin-block: 1.75rem; }
.reader-page .doc__body .diagram { padding: 1rem; border-color: var(--reader-border); border-radius: var(--reader-radius); background: var(--reader-canvas); }
.reader-page .doc__body .diagram > pre.mermaid { min-inline-size: 0; border: 0; background: transparent; padding: 0; }
.reader-page .doc__body .diagram > pre.mermaid--raw { padding: 1rem; text-align: start; white-space: pre-wrap; }
.reader-page .doc__body :is(img, video, iframe) { max-inline-size: 100%; }

/* Disclosures preserve the heading hierarchy and wrap long labels. */
.reader-page .doc__body details { margin-block: 1.25rem; }
.reader-page .doc__body details > summary {
  max-inline-size: 100%;
  block-size: auto;
  min-block-size: var(--reader-action-size);
  padding: .625rem .875rem;
  color: var(--reader-heading);
  background: var(--reader-surface);
  border: 1px solid var(--reader-border);
  border-radius: var(--reader-radius);
  box-shadow: none;
  font-size: inherit;
  line-height: 1.5;
  white-space: normal;
  text-align: start;
  transform: none;
}
.reader-page .doc__body details[open] > summary,
.reader-page .doc__body details > summary:active { background: var(--reader-surface); box-shadow: none; transform: none; }
.reader-page .doc__body details > .details__body { max-inline-size: 100%; margin-block-start: .75rem; padding: .25rem 0 .25rem 1rem; border: 0; border-inline-start: 1px solid var(--reader-border); border-radius: 0; background: transparent; }
.reader-page .doc__body details.sec { margin: 0; }
.reader-page .doc__body .sec > summary {
  display: flex;
  align-items: baseline;
  gap: .65rem;
  padding: 0;
  background: transparent;
  border: 0;
  border-radius: .25rem;
  box-shadow: none;
  transform: none;
}
.reader-page .doc__body .sec > summary::before { flex: none; font-family: var(--font-body); font-size: 1rem; color: var(--reader-muted); }
.reader-page .doc__body .sec > summary > :is(h2, h3, h4, h5, h6) { flex: 1; min-inline-size: 0; margin: 0; }
.reader-page .doc__body .sec[open] > summary,
.reader-page .doc__body .sec > summary:active { background: transparent; }
.reader-page .doc__body .sec--1 > summary { margin-block: 2.75rem 1rem; }
.reader-page .doc__body .sec--2 > summary { margin-block: 2rem .875rem; }
.reader-page .doc__body .sec--3 > summary { margin-block: 1.625rem .75rem; }
.reader-page .doc__body .sec__body { min-inline-size: 0; }
.reader-page .doc__body .toc { margin-block: .5rem 1.75rem; }
.reader-page .doc__body .toc summary { padding-block: .25rem; min-block-size: var(--reader-action-size); border: 0; border-radius: 0; background: transparent; font-size: var(--reader-small); line-height: 1.6; }
.reader-page .doc__body .toc details { margin: 0; }
.reader-page .doc__body .toc details[open] > summary { background: transparent; }
.reader-page .doc__body .toc :is(ul, ol) { margin: 0; list-style: none; padding-inline-start: 1.5rem; }
.reader-page .doc__body .toc li { padding-inline-start: 0; margin: 0; }
.reader-page .doc__body .toc a.toc__link { padding-block: .375rem; color: var(--reader-muted); font-size: var(--reader-small); line-height: 1.6; text-decoration-thickness: 1px; }
.reader-page .toc__tools { margin-block: 0 .875rem; padding-block-end: .75rem; border-color: var(--reader-border); }
.reader-page .toc__tools .eyebrow { color: var(--reader-muted); font-family: var(--font-body); font-size: .9375rem; font-weight: 600; letter-spacing: 0; text-transform: none; }
.reader-page .finish { min-block-size: 3rem; height: auto; white-space: normal; }
.reader-page .reader-pager__link { min-inline-size: 0; white-space: normal; }
.reader-page .reader-pager__title { font-size: 1rem; line-height: 1.5; }

/* Expanded source and denied-clipboard fallback use native accessible dialogs. */
:is(.reader-code-dialog, .reader-copy-fallback) {
  inline-size: min(76rem, calc(100vw - 2rem));
  max-inline-size: calc(100vw - 2rem);
  max-block-size: calc(100dvh - 2rem);
  margin: auto;
  padding: 0;
  border: 1px solid var(--reader-control-border);
  border-radius: .75rem;
  color: var(--reader-ink);
  background: var(--reader-canvas);
  font-family: var(--font-body);
  font-size: var(--reader-body);
  line-height: 1.6;
  overflow: hidden;
}
:is(.reader-code-dialog, .reader-copy-fallback)::backdrop { background: #000000b8; }
:is(.reader-code-dialog, .reader-copy-fallback) .reader-dialog-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: .5rem;
  padding: .5rem .75rem .5rem 1.25rem;
  border-block-end: 1px solid var(--reader-border);
  background: var(--reader-surface);
}
:is(.reader-code-dialog, .reader-copy-fallback) .reader-dialog-header :is(h2, h3, p) { flex: 1; min-inline-size: 0; margin: 0; font-size: 1rem; line-height: 1.5; overflow-wrap: anywhere; }
:is(.reader-code-dialog, .reader-copy-fallback) .reader-dialog-body { max-block-size: calc(100dvh - 7rem); padding: 0; overflow: auto; overscroll-behavior: contain; }
.reader-code-dialog .reader-dialog-body > :is(.codeframe, .reader-code-block, pre) { margin: 0; border: 0; border-radius: 0; }
.reader-copy-fallback { inline-size: min(42rem, calc(100vw - 2rem)); padding: 1.25rem; }
.reader-copy-fallback p { margin-block: 0 1rem; font-size: 1rem; }
.reader-copy-fallback textarea { display: block; inline-size: 100%; min-block-size: 12rem; max-block-size: 55dvh; margin-block: 1rem; padding: 1rem; border: 1px solid var(--reader-control-border); border-radius: .5rem; color: var(--reader-ink); background: var(--reader-surface); font-family: var(--reader-code-font); font-size: 1rem; line-height: 1.65; resize: vertical; }
.reader-copy-status { position: fixed; z-index: 180; inset-block-end: max(1.5rem, env(safe-area-inset-bottom)); inset-inline-start: 50%; transform: translateX(-50%); inline-size: max-content; max-inline-size: calc(100vw - 2rem); margin: 0; padding: .65rem 1rem; border: 1px solid var(--reader-control-border, #757d8c); border-radius: .5rem; color: var(--reader-ink, var(--ink-1)); background: var(--reader-canvas, var(--paper-1)); box-shadow: 0 .25rem 1rem #00000026; font-family: var(--font-body); font-size: .9375rem; line-height: 1.5; text-align: center; pointer-events: none; }
.reader-copy-status { opacity: 0; }
.reader-copy-status[data-visible="true"] { opacity: 1; }
.reader-copy-status:empty { padding: 0; border: 0; }

@media (max-width: 37.4375rem) {
  .reader-page { padding-block-start: 1.5rem; }
  .reader-page .runninghead { margin-block-end: 1.25rem; }
  .reader-page .doc__title { max-inline-size: 100%; }
  .reader-page .doc__body .aside { padding: .875rem; }
  .reader-page .doc__body .tablewrap :is(th, td) { padding: .75rem; }
  .reader-page .doc__body .tablewrap table { min-inline-size: 26rem; }
  .reader-page .doc__body .tablewrap table.cols-2 { min-inline-size: 100%; }
  .reader-page .reader-toolbar { margin-block-end: 1.5rem; }
  .reader-page[data-copy-mode="true"] .reader-toolbar { gap: .25rem; padding-block: .375rem; }
  .reader-page .reader-toolbar-actions { gap: .375rem; }
  .reader-page .reader-copy-session { gap: .25rem .375rem; padding-block-start: .375rem; }
  .reader-page .reader-selection-hint { flex-basis: 10rem; }
  .reader-page .reader-selection-actions { flex: 1 1 100%; justify-content: flex-end; }
  .reader-page .reader-copy-session button { padding-inline: .625rem; }
  .reader-page .reader-toolbar [data-reader-copy="reader-lesson"] { inline-size: var(--reader-action-size); padding: .7rem; }
  .reader-page .reader-toolbar [data-reader-copy="reader-lesson"] .reader-action-label { display: none; }
  .reader-page .reader-unit-actions { margin-inline-start: .25rem; }
  .reader-page .reader-preferences { padding: 1rem; }
  .reader-page .reader-section-copy .reader-action-label,
  :is(.reader-page, .reader-code-dialog) .reader-code-action .reader-action-label { display: none; }
  .reader-page .reader-section-copy { inline-size: var(--reader-action-size); padding: .7rem; }
  .reader-page .doc__body .sec > summary { gap: .4rem; }
  .reader-page[data-copy-mode="true"] .doc__body .sec > summary { flex-wrap: wrap; }
  .reader-page[data-copy-mode="true"] .doc__body .sec > summary > :is(h2, h3, h4, h5, h6) { flex-basis: calc(100% - 2rem); }
  .reader-page[data-copy-mode="true"] .reader-section-tools { margin-inline-start: auto; margin-block-start: -.25rem; }
  .reader-page .doc__body .sec--1 > summary { margin-block-start: 2rem; }
  .reader-page .doc__body pre { padding-inline: 1rem; }
  .reader-page .doc__body .expressive-code { --ec-codePadInl: 1rem; }
  :is(.reader-code-dialog, .reader-copy-fallback) { max-inline-size: calc(100vw - 1rem); max-block-size: calc(100dvh - 1rem); inline-size: calc(100vw - 1rem); }
}
@media (prefers-reduced-motion: reduce) {
  :is(.reader-page, .reader-code-dialog, .reader-copy-fallback) * { scroll-behavior: auto; transition-duration: 0s; }
}
@media (forced-colors: active) {
  :is(.reader-page, .reader-code-dialog, .reader-copy-fallback) :is(.reader-copy, .reader-select),
  .reader-page .reader-preference-option { border: 1px solid ButtonText; }
  .reader-page .reader-preference-option[aria-pressed="true"] { outline: 2px solid Highlight; }
  .reader-page .reader-select[aria-checked="true"],
  .reader-page[data-copy-mode="true"] [data-reader-selected="true"] { outline: 2px solid Highlight; }
  .reader-page[data-copy-mode="true"] [data-reader-covered="true"] { outline: 0; }
}
@media print {
  .reader-page { max-inline-size: none; padding: 0; color: #000; background: #fff; }
  .reader-page :is(.reader-copy, .reader-select, .reader-unit-actions, .reader-toolbar, .reader-section-tools, .reader-code-tools, .reader-table-tools, .reader-math-tools), .reader-copy-status { display: none !important; }
  .reader-page [data-reader-selected="true"], .reader-page [data-reader-covered="true"] { background-color: transparent; box-shadow: none; outline: none; }
  .reader-page .doc__body pre { white-space: pre-wrap; overflow-wrap: anywhere; }
}