/* R22 reading bar: progress, time, current section and one Contents menu. */
body[data-reading-kit-mounted] .section-jump { display: none !important; }
/* Contents needs JavaScript: until the fallback controller binds it, hide the whole nav. */
.section-jump:not([data-contents-mounted]) { display: none; }
.reading-bar {
  position: sticky;
  top: var(--reading-top, 0px);
  z-index: 19;
  background: color-mix(in srgb, var(--bg) 96%, transparent);
  border-bottom: 1px solid var(--line);
}
.reading-inner { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 52px; }
.reading-status { margin: 0; min-width: 0; display: flex; align-items: baseline; gap: 12px; font-size: 0.875rem; color: var(--muted); }
.reading-time { flex: none; display: inline-flex; align-items: center; gap: 10px; font-size: 0.8125rem; line-height: 1.4; font-variant-numeric: tabular-nums; }
.reading-chip { padding: 2px 9px; border-radius: 999px; border: 1px solid color-mix(in srgb, var(--accent) 45%, var(--line)); color: var(--ink); font-weight: 600; font-size: 0.75rem; }
.reading-current { min-width: 0; color: var(--ink); font-weight: 600; }
.reading-current:not(:empty)::before { content: "·"; margin-right: 12px; color: var(--muted); font-weight: 400; }
.reading-toggle {
  min-height: 40px; padding: 0 16px; border-radius: 20px;
  border: 1px solid var(--line); background: var(--surface); color: var(--ink);
  font: inherit; font-size: 0.875rem; font-weight: 600; cursor: pointer;
}
.reading-toggle::after { content: "⌄"; margin-left: 8px; display: inline-block; transition: transform 0.15s ease; }
.reading-toggle[aria-expanded="true"]::after { transform: rotate(180deg); }
.reading-toggle:hover { border-color: var(--accent); }
.reading-progress { height: 2px; background: transparent; }
.reading-progress span { display: block; height: 100%; background: var(--accent); transform: scaleX(0); transform-origin: left; }
.reading-panel {
  position: absolute; left: 0; right: 0; top: 100%;
  max-height: min(70vh, 560px); overflow: auto;
  margin-top: 8px; padding: 22px 26px;
  display: grid; grid-template-columns: minmax(0, 1fr) minmax(220px, 300px); gap: 24px;
  background: var(--surface); border: 1px solid var(--line); border-top: 3px solid var(--accent); border-radius: 14px;
  box-shadow: 0 24px 60px #0007;
}
.reading-panel[hidden] { display: none; }
.reading-panel ol { list-style: none; margin: 10px 0 0; padding: 0; columns: 2 220px; column-gap: 24px; }
.reading-panel li { break-inside: avoid; }
.reading-panel ol a { display: flex; align-items: center; min-height: 40px; padding: 4px 10px; border-radius: 8px; color: var(--ink); text-decoration: none; }
.reading-panel ol a:hover { background: var(--soft); }
.reading-panel ol a[aria-current] { color: var(--ink); font-weight: 700; background: color-mix(in srgb, var(--accent) 22%, transparent); box-shadow: inset 4px 0 0 var(--accent); border-radius: 4px 8px 8px 4px; }
.reading-more { display: flex; flex-direction: column; gap: 4px; }
.reading-more a, .reading-next-link { display: flex; min-height: 44px; flex-direction: column; align-items: flex-start !important; justify-content: center; padding: 12px 14px; border-radius: 10px; background: var(--soft); color: var(--ink); text-decoration: none; }
.reading-next-link .eyebrow { margin: 0; font-size: var(--label-size); color: var(--muted); }
.reading-next { display: flex; flex-wrap: wrap; align-items: center; gap: 14px 24px; margin-block: 56px 24px; padding-top: 28px; border-top: 1px solid var(--line); }
.reading-next .eyebrow { flex-basis: 100%; margin: 0; }
/* Anchor targets (sections, headings, bare id markers) clear both sticky bars. */
body[data-reading-kit] [id] { scroll-margin-top: calc(var(--reading-top, 0px) + var(--reading-bar, 54px) + 16px); }

/* Long static tables: a short preview with an explicit expand. */
.table-peek { position: relative; margin-block: 1rem; }
.table-peek .peek-body { overflow-x: auto; }
.table-peek[data-collapsed] .peek-body { max-height: 380px; overflow-y: hidden; -webkit-mask-image: linear-gradient(#000 70%, transparent); mask-image: linear-gradient(#000 70%, transparent); }
.peek-toggle {
  margin-top: 8px; min-height: 44px; padding: 0 16px; border-radius: 22px;
  border: 1px solid var(--line); background: var(--surface); color: var(--ink);
  font: inherit; font-size: 0.875rem; font-weight: 600; cursor: pointer;
}
.peek-toggle:hover { border-color: var(--accent); }

/* Key takeaway at the end of a guide section. */
.takeaway { margin: 22px 0 6px; padding: 14px 18px; border-radius: 12px; background: var(--soft); color: var(--ink); line-height: 1.6; }
.takeaway strong:first-child { display: block; margin-bottom: 4px; font: var(--label-size)/1.4 ui-monospace, "SF Mono", Menlo, Consolas, monospace; letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent); }
.page-meta { margin: 10px 0 0; font: 12px/1.5 ui-monospace, "SF Mono", Menlo, Consolas, monospace; letter-spacing: 0.08em; color: var(--muted); }
.model-note strong:first-child { color: var(--ink); }

@media (max-width: 700px) {
  .reading-inner { min-height: 48px; gap: 10px; }
  .reading-time { display: none; }
  .reading-current:not(:empty)::before { content: none; }
  .reading-panel { grid-template-columns: 1fr; padding: 16px; left: 8px; right: 8px; }
  .reading-panel ol { columns: 1; }
  .reading-panel nav { display: block; width: auto; padding: 0; border: 0; }  /* not the site header's phone nav row */
}
@media (max-height: 500px) { .reading-bar { position: relative; top: 0; } }
@media print { .reading-bar, .reading-next, .peek-toggle { display: none !important; } .table-peek .peek-body { max-height: none !important; -webkit-mask-image: none !important; mask-image: none !important; } }

/* Compact model note: one visible line of context, not a banner. */
.note-notice.model-note { font-size: 0.8125rem; line-height: 1.55; padding: 10px 14px; margin-block: 14px; max-width: 760px; }
/* Phones: the reading bar sits at the bottom, within thumb reach, and never pushes content. */
@media (max-width: 700px) {
  .reading-bar { position: fixed; top: auto; bottom: 0; left: 0; right: 0; border-bottom: 0; border-top: 1px solid var(--line); padding-bottom: env(safe-area-inset-bottom); }
  .reading-progress { position: absolute; top: -1px; left: 0; right: 0; }
  .reading-panel { top: auto; bottom: 100%; margin: 0 0 8px; max-height: 70dvh; }
  /* R41: room for the bar; field-notes.css reuses --reading-pad over its dock padding. */
  body[data-reading-kit] { --reading-pad: calc(var(--reading-bar, 56px) + env(safe-area-inset-bottom)); padding-bottom: var(--reading-pad); }
  body[data-reading-kit] [id] { scroll-margin-top: 16px; }
}
/* R25: where you are in your constellation, at the end of each guide. */
.reading-next.has-constellation { display: grid; grid-template-columns: auto minmax(0, 1fr); column-gap: 24px; align-items: center; }
.reading-next.has-constellation > :not(.reading-constellation) { grid-column: 2; justify-self: start; }
.reading-constellation { grid-row: 1 / span 4; display: flex; flex-direction: column; align-items: center; gap: 6px; }
.reading-constellation svg { border-radius: 12px; background: radial-gradient(circle at 50% 40%, color-mix(in srgb, var(--second) 16%, var(--bg)), var(--bg) 75%); }
.reading-constellation p { margin: 0; display: flex; flex-direction: column; align-items: center; text-align: center; font-size: 0.75rem; color: var(--muted); }
.reading-constellation .eyebrow { font-size: var(--label-size); color: var(--accent); }
.reading-constellation .cf-speck { fill: var(--muted); opacity: 0.35; }
.reading-constellation .cf-route { fill: none; stroke: var(--accent); stroke-linecap: round; }
.reading-constellation .cf-star { fill: var(--ink); }
.reading-constellation .cf-seen, .reading-constellation .cf-current { fill: var(--accent); }
.reading-constellation .cf-ring { fill: none; stroke: var(--accent); opacity: 0.6; }
@media (max-width: 520px) { .reading-next.has-constellation { grid-template-columns: 1fr; row-gap: 14px; } .reading-next.has-constellation > * { grid-column: 1 !important; grid-row: auto !important; } .reading-constellation { flex-direction: row; } .reading-constellation p { align-items: flex-start; text-align: left; } }
/* R40: the chapter line, in the contents panel and at the end of each page. */
.reading-chapter {
  display: flex;
  flex-wrap: wrap;
  gap: 0 1.5rem;
  align-items: center;
  margin: 0;  /* the panel's own gap spaces it; the page's p margin doubled it */
}
.reading-chapter span {
  color: var(--muted);
  flex-basis: 100%;
}

/* R41 (N2): the next chapter is the primary card; a rail shows the book. */
.reading-onward { display: flex; flex-direction: column; gap: 2px; min-width: min(100%, 380px); padding: 16px 20px; border: 1px solid var(--accent); border-radius: 14px; background: var(--soft); color: var(--ink); text-decoration: none; }
.reading-onward:hover { text-decoration: none; background: color-mix(in srgb, var(--accent) 18%, var(--soft)); }
.reading-next .reading-onward .eyebrow { flex-basis: auto; font-size: var(--label-size); color: var(--muted); }
.reading-onward strong { font-size: 1.25rem; line-height: 1.3; }
.reading-onward span:last-child { font-size: 0.875rem; color: var(--muted); }
.chapter-rail { flex-basis: 100%; display: flex; flex-wrap: wrap; align-items: center; gap: 8px 16px; margin: 4px 0 0; }
.rail-dots { display: inline-flex; flex-wrap: wrap; gap: 6px 14px; }
.rail-part { display: inline-flex; gap: 5px; }
.chapter-rail i { width: 10px; height: 10px; border-radius: 50%; border: 1px solid var(--line); }
.chapter-rail .is-read { background: color-mix(in srgb, var(--accent) 50%, transparent); border-color: transparent; }
.chapter-rail .is-here { background: var(--accent); border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 30%, transparent); }
.chapter-rail small { font-size: 0.8125rem; color: var(--muted); }
/* R41 (V3): glossary terms explain themselves on hover, tap or focus. */
.gloss { position: relative; text-decoration: underline dotted color-mix(in srgb, var(--accent) 70%, transparent); text-underline-offset: 3px; cursor: help; }
.gloss:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 2px; }
.gloss-tip { display: none; position: absolute; left: 0; bottom: calc(100% + 6px); z-index: 30; width: max-content; max-width: min(320px, calc(100vw - 24px)); padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); color: var(--ink); box-shadow: 0 12px 32px var(--shadow); font-size: 0.8125rem; font-weight: 400; line-height: 1.5; text-align: left; white-space: normal; cursor: auto; }
.gloss-tip b { display: block; font-weight: 600; }
.gloss-tip::after { content: ""; position: absolute; left: 0; right: 0; top: 100%; height: 8px; }  /* hover bridge to the tip */
.gloss-tip a { color: var(--accent); }
.gloss:is(:hover, :focus-within) .gloss-tip { display: block; }
/* R41 (V4): pick up where you left off. */
.reading-resume { display: inline-flex; align-items: center; gap: 2px; margin-right: 8px; }
.reading-resume button { min-height: 40px; padding: 0 12px; border: 1px solid var(--accent); border-radius: 20px 0 0 20px; background: var(--soft); color: var(--ink); font: inherit; font-size: 0.8125rem; font-weight: 600; cursor: pointer; max-width: 36ch; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.reading-resume .reading-resume-close { border-radius: 0 20px 20px 0; padding: 0 12px; }
.reading-actions { display: flex; align-items: center; }
@media (max-width: 700px) {
  .reading-inner:has(.reading-resume) { flex-wrap: wrap; }
  .reading-inner:has(.reading-resume) .reading-status { flex-basis: 100%; }
  .reading-inner:has(.reading-resume) .reading-actions {
    flex-basis: 100%; flex-wrap: wrap; gap: 8px; justify-content: space-between; min-width: 0;
  }
  .reading-resume { flex: 1 1 100%; align-items: stretch; min-width: 0; margin-right: 0; }
  .reading-resume button:first-child { flex: 1; min-width: 0; white-space: normal; text-align: left; }
  .reading-resume-close, .reading-inner:has(.reading-resume) .reading-toggle { flex: none; }
}
/* 701-820px: with an offer showing, drop the section name so the bar stays one row. */
@media (min-width: 701px) and (max-width: 820px) {
  .reading-inner:has(.reading-resume) .reading-current { display: none; }
  .reading-toggle { white-space: nowrap; }
}
/* R41 (M5): a lab value that changed glows once; a still mark without motion. */
.value-changed { box-shadow: inset 3px 0 0 var(--accent); }
:root[data-motion=on] .value-changed { animation: value-glow 1.4s ease-out; }
@keyframes value-glow { from { background-color: color-mix(in srgb, var(--accent) 28%, transparent); } to { background-color: transparent; } }
@media (prefers-reduced-motion: reduce) { :root .value-changed { animation: none; } }