/* =============================================================================
   style.css — New England Users Group, prototype homepage
   Art direction: Tufte in Cambridge.
   Warm paper field, deep ink, hairline rules, generous measure, marginalia,
   data-dense figures with no chrome. Nothing is boxed that a rule can bound.

   1.  Tokens
   2.  Page frame, measure and marginalia
   3.  Typographic primitives
   4.  Masthead
   5.  Thesis
   6.  Notice (forthcoming gathering)
   7.  Figure: featured finding
   7b. The plate — interactive relief of New England
   8.  Index of reports
   9.  Calendar ledger
   10. Colloquium notes
   11. Membership
   12. Colophon / footer
   13. Reading-width behaviour on small screens
   ========================================================================== */

/* -----------------------------------------------------------------------------
   1. Tokens
   -------------------------------------------------------------------------- */

:root,
[data-theme='light'] {
  /* Field */
  --paper: #fcfbf8;
  --paper-sunk: #f6f3ec;

  /* Ink */
  --ink: #191c1f;
  --ink-2: #4a4e54;
  --ink-3: #6b6f76;

  /* Rules — the primary structural device */
  --rule: #ded9cf;
  --rule-strong: #b6b0a3;
  --rule-ink: #191c1f;

  /* Secondary accent: brick, used only for links and annotation */
  --brick: #8e3b2a;
  --brick-deep: #6f2c1e;

  /* Highlighter: the single moment of yellow */
  --marker: #ffd23f;
  --marker-soft: #ffe9a3;

  /* Figures */
  --plot-ink: #191c1f;
  --plot-muted: #a29c90;
  --plot-rule: #d6d1c6;

  --focus: #8e3b2a;

  color-scheme: light;
}

[data-theme='dark'] {
  --paper: #16171a;
  --paper-sunk: #1c1e21;

  --ink: #e9e5dc;
  --ink-2: #b3ada2;
  --ink-3: #8e887e;

  --rule: #32332f;
  --rule-strong: #4e4f49;
  --rule-ink: #e9e5dc;

  --brick: #d08466;
  --brick-deep: #e09b80;

  --marker: #f0c34a;
  --marker-soft: #5a4a18;

  --plot-ink: #e9e5dc;
  --plot-muted: #8b8578;
  --plot-rule: #3a3b36;

  --focus: #f0c34a;

  color-scheme: dark;
}

:root {
  --serif: 'Literata', 'Iowan Old Style', 'Palatino Linotype', Palatino, Georgia, serif;
  --sans: 'Switzer', 'Helvetica Neue', 'Segoe UI', sans-serif;

  /* Measure and marginalia */
  --text-col: 39rem;
  --note-col: 15.5rem;
  --note-gap: 2.5rem;
  --page-col: calc(var(--text-col) + var(--note-gap) + var(--note-col));
  --gutter: clamp(1.25rem, 5vw, 3rem);

  /* Vertical rhythm */
  --lead: 1.62;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 2.75rem;
  --space-8: 4rem;
  --space-9: 6rem;
  --space-10: 8rem;
}

/* -----------------------------------------------------------------------------
   2. Page frame, measure and marginalia
   -------------------------------------------------------------------------- */

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.1875rem; /* 19px */
  line-height: var(--lead);
  font-weight: 380;
  font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  font-variant-numeric: oldstyle-nums proportional-nums;
}

.sheet {
  width: 100%;
  max-width: calc(var(--page-col) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* Everything in the reading flow sits on the text measure; marginalia float
   into the reserved right-hand column. Sections are the full page column wide,
   so a right float lands exactly in the note column with no negative margin —
   and the note never widens the page. */
.measure {
  max-width: var(--text-col);
}

.sidenote {
  float: right;
  clear: right;
  width: var(--note-col);
  margin-left: var(--note-gap);
  margin-top: 0.4rem;
  margin-bottom: var(--space-4);
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--ink-2);
  border-top: 1px solid var(--rule);
  padding-top: 0.45rem;
}
.sidenote b,
.sidenote strong {
  font-weight: 600;
  color: var(--ink);
}
.sidenote--figure {
  border-top: 0;
  padding-top: 0;
}

main {
  display: block;
}

section {
  position: relative;
}

/* -----------------------------------------------------------------------------
   3. Typographic primitives
   -------------------------------------------------------------------------- */

a {
  color: inherit;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
  text-decoration-color: var(--rule-strong);
  transition: text-decoration-color 120ms ease, color 120ms ease;
}
a:hover {
  color: var(--brick);
  text-decoration-color: var(--brick);
}
a:active {
  color: var(--brick-deep);
}

p + p {
  margin-top: var(--space-4);
  text-indent: 0;
}

em,
i {
  font-style: italic;
}

strong,
b {
  font-weight: 600;
}

.tnum {
  font-variant-numeric: lining-nums tabular-nums;
}
.lnum {
  font-variant-numeric: lining-nums proportional-nums;
}

/* Small-caps sans label — the workhorse for metadata */
.label {
  font-family: var(--sans);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
  font-variant-numeric: lining-nums tabular-nums;
}

.meta {
  font-family: var(--sans);
  font-size: 0.8125rem;
  line-height: 1.55;
  color: var(--ink-2);
  font-variant-numeric: lining-nums tabular-nums;
  font-weight: 400;
}

/* A word or figure under the highlighter. Used perhaps six times in the page. */
.mark {
  background-image: linear-gradient(var(--marker), var(--marker));
  background-repeat: no-repeat;
  background-size: 100% 0.62em;
  background-position: 0 0.72em;
  padding-inline: 0.1em;
}
[data-theme='dark'] .mark {
  color: #16171a;
  background-size: 100% 1.12em;
  background-position: 0 0.24em;
}

/* Rules */
.rule {
  height: 1px;
  background: var(--rule);
}
.rule--ink {
  background: var(--rule-strong);
}
.rule--double {
  height: 4px;
  background: none;
  border-top: 2px solid var(--rule-ink);
  border-bottom: 1px solid var(--rule-ink);
}

/* Section heading: roman numeral hung in the margin on wide screens */
.section-head {
  font-family: var(--sans);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-2);
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding-bottom: 0.55rem;
  border-bottom: 1px solid var(--rule-strong);
  margin-bottom: var(--space-6);
}
.section-head__num {
  font-family: var(--serif);
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: var(--ink-3);
  font-style: italic;
  text-transform: none;
}
.section-head__aside {
  margin-left: auto;
  font-weight: 400;
  letter-spacing: 0.09em;
  color: var(--ink-3);
  text-transform: none;
  font-size: 0.75rem;
}
.section-head__aside a {
  text-decoration-color: var(--rule);
}

section + section {
  margin-top: var(--space-9);
}

/* A text action — the page has no buttons except where state is toggled. */
.action {
  font-family: var(--sans);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: var(--brick);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.24em;
  text-decoration-color: var(--brick);
}
.action:hover {
  text-decoration-thickness: 2px;
}
.action::after {
  content: ' →';
  text-decoration: none;
  display: inline-block;
}

/* Inline sparkline, set on the baseline inside running prose */
.spark {
  display: inline-block;
  width: 3.6em;
  height: 0.85em;
  margin-inline: 0.12em 0.05em;
  vertical-align: -0.06em;
  overflow: visible;
}
.spark line,
.spark polyline {
  vector-effect: non-scaling-stroke;
}

/* -----------------------------------------------------------------------------
   4. Masthead
   -------------------------------------------------------------------------- */

.masthead {
  padding-top: var(--space-6);
}
.masthead__top {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-5);
  flex-wrap: wrap;
}
.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: var(--ink);
}
.wordmark:hover {
  color: var(--ink);
}
.wordmark__mark {
  flex: none;
  overflow: visible;
}
.wordmark__text {
  font-family: var(--serif);
  font-size: clamp(1.05rem, 2.2vw, 1.3rem);
  font-weight: 500;
  letter-spacing: 0.055em;
  text-transform: uppercase;
  line-height: 1;
}
.masthead__meta {
  font-family: var(--sans);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--ink-3);
  font-variant-numeric: lining-nums tabular-nums;
  padding-bottom: 0.15rem;
}

.masthead__rule {
  margin-top: 0.85rem;
}

.masthead__nav {
  margin-top: 0.5rem;
  padding-bottom: 0.55rem;
  border-bottom: 1px solid var(--rule);
}
.masthead__nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 0 1.6rem;
  font-family: var(--sans);
  font-size: 0.8125rem;
  letter-spacing: 0.03em;
}
.masthead__nav a {
  display: inline-block;
  padding-block: 0.45rem;
  color: var(--ink-2);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}
.masthead__nav a:hover,
.masthead__nav a:focus-visible {
  color: var(--ink);
  border-bottom-color: var(--marker);
}
.masthead__nav li:last-child {
  margin-left: auto;
}
.masthead__nav li:last-child a {
  color: var(--brick);
}

/* -----------------------------------------------------------------------------
   5. Thesis
   -------------------------------------------------------------------------- */

.thesis {
  padding-top: var(--space-8);
}
.dateline {
  font-family: var(--sans);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: var(--space-5);
}
.thesis h1 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(2rem, 5.1vw, 3.15rem);
  line-height: 1.09;
  letter-spacing: -0.017em;
  max-width: 22ch;
  text-wrap: balance;
}
.thesis h1 em {
  font-style: italic;
  font-weight: 400;
}
.lede {
  margin-top: var(--space-6);
  font-size: 1.3125rem;
  line-height: 1.52;
  color: var(--ink);
  max-width: 34rem;
}
.thesis__body {
  margin-top: var(--space-5);
  color: var(--ink-2);
}

/* The community figures, written as a sentence rather than displayed as tiles */
.pulse {
  margin-top: var(--space-6);
  padding-top: var(--space-4);
  border-top: 1px solid var(--rule);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--ink-2);
  max-width: 37rem;
}
.pulse b {
  color: var(--ink);
  font-weight: 600;
  font-variant-numeric: lining-nums proportional-nums;
}
.pulse .spark {
  color: var(--plot-muted);
}

/* -----------------------------------------------------------------------------
   6. Notice — the forthcoming gathering
   -------------------------------------------------------------------------- */

.notice {
  padding-top: 0;
}
.notice__body {
  border-left: 2px solid var(--marker);
  padding-left: var(--space-5);
}
.notice__when {
  font-family: var(--sans);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--ink);
  font-variant-numeric: lining-nums tabular-nums;
}
.notice__when span {
  color: var(--ink-3);
  font-weight: 400;
  letter-spacing: 0.09em;
}
.notice h3 {
  margin-top: var(--space-3);
  font-family: var(--serif);
  font-weight: 400;
  font-style: italic;
  font-size: clamp(1.45rem, 3vw, 1.9rem);
  line-height: 1.22;
  letter-spacing: -0.008em;
}
.notice__particulars {
  margin-top: var(--space-4);
  color: var(--ink-2);
  font-size: 1.0625rem;
  line-height: 1.62;
  max-width: 33rem;
}
.notice__particulars b {
  color: var(--ink);
}
.notice__foot {
  margin-top: var(--space-5);
  display: flex;
  align-items: baseline;
  gap: var(--space-5);
  flex-wrap: wrap;
}

/* Seats: a rule that is partly inked. No progress bar, no track chrome. */
.seats {
  display: flex;
  align-items: baseline;
  gap: 0.65rem;
  font-family: var(--sans);
  font-size: 0.75rem;
  color: var(--ink-3);
  font-variant-numeric: lining-nums tabular-nums;
}
.seats__rule {
  display: block;
  width: 7rem;
  height: 3px;
  background: var(--rule);
  position: relative;
  top: -0.15em;
}
.seats__rule i {
  display: block;
  height: 100%;
  background: var(--ink-2);
}

/* -----------------------------------------------------------------------------
   7. Figure — featured finding
   -------------------------------------------------------------------------- */

.finding__kicker {
  font-family: var(--sans);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.finding h3 {
  margin-top: var(--space-3);
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(1.5rem, 3.4vw, 2.1rem);
  line-height: 1.2;
  letter-spacing: -0.012em;
  max-width: 28ch;
}
.finding__standfirst {
  margin-top: var(--space-4);
  color: var(--ink-2);
  max-width: 36rem;
}

.figure {
  margin-top: var(--space-7);
}
.chart-frame {
  width: 100%;
}
.chart {
  display: block;
  width: 100%;
  overflow: visible;
  font-family: var(--sans);
  font-variant-numeric: lining-nums tabular-nums;
}
.chart text {
  font-size: 11.5px;
  fill: var(--ink-3);
}
.chart .t-axis {
  font-size: 11px;
  fill: var(--ink-3);
}
.chart .t-series {
  font-size: 13px;
  font-weight: 600;
  fill: var(--plot-ink);
}
.chart .t-series--muted {
  font-weight: 500;
  fill: var(--ink-3);
}
.chart .t-annot {
  font-size: 12.5px;
  font-style: italic;
  font-family: var(--serif);
  fill: var(--brick);
}
.chart .hit {
  fill: transparent;
  cursor: crosshair;
}
.chart .hit:focus-visible {
  outline: none;
}

/* Reading line: the hover/focus readout, as text rather than a floating box */
.readout {
  margin-top: 0.9rem;
  padding-top: 0.55rem;
  border-top: 1px solid var(--rule);
  font-family: var(--sans);
  font-size: 0.8125rem;
  color: var(--ink-2);
  font-variant-numeric: lining-nums tabular-nums;
  min-height: 2.6em;
}
.readout b {
  color: var(--ink);
  font-weight: 600;
}
.readout .readout__hint {
  color: var(--ink-3);
}

/* Small multiples double as the measure selector */
.multiples {
  margin-top: var(--space-6);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-5);
  border-top: 1px solid var(--rule);
  padding-top: var(--space-4);
}
.multiple {
  display: block;
  text-align: left;
  padding: 0.35rem 0 0.5rem;
  border-bottom: 2px solid transparent;
  color: var(--ink-3);
}
.multiple svg {
  width: 100%;
  height: 42px;
  overflow: visible;
}
.multiple__name {
  display: block;
  font-family: var(--sans);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  margin-bottom: 0.45rem;
  color: inherit;
}
.multiple__val {
  display: block;
  margin-top: 0.4rem;
  font-family: var(--sans);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-3);
  font-variant-numeric: lining-nums tabular-nums;
}
.multiple:hover {
  color: var(--ink);
}
.multiple:hover .multiple__name {
  text-decoration: underline;
  text-decoration-color: var(--rule-strong);
  text-underline-offset: 0.2em;
}
.multiple[aria-pressed='true'] {
  border-bottom-color: var(--marker);
  color: var(--ink);
}
.multiple[aria-pressed='true'] .multiple__name {
  font-weight: 600;
}

/* Data table behind a disclosure */
.data-table {
  margin-top: var(--space-6);
  border-top: 1px solid var(--rule);
  padding-top: var(--space-3);
}
.data-table > summary {
  font-family: var(--sans);
  font-size: 0.8125rem;
  color: var(--ink-2);
  cursor: pointer;
  list-style: none;
  padding-block: 0.35rem;
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
}
.data-table > summary::-webkit-details-marker {
  display: none;
}
.data-table > summary::before {
  content: '+';
  font-family: var(--sans);
  color: var(--ink-3);
}
.data-table[open] > summary::before {
  content: '–';
}
.data-table > summary:hover {
  color: var(--ink);
}
.data-table table {
  width: 100%;
  margin-top: var(--space-3);
  font-family: var(--sans);
  font-size: 0.8125rem;
  font-variant-numeric: lining-nums tabular-nums;
  color: var(--ink-2);
}
.data-table caption {
  text-align: left;
  color: var(--ink-3);
  font-size: 0.75rem;
  padding-bottom: 0.6rem;
}
.data-table th,
.data-table td {
  text-align: right;
  padding: 0.3rem 0.75rem 0.3rem 0;
  border-bottom: 1px solid var(--rule);
}
.data-table th:first-child,
.data-table td:first-child {
  text-align: left;
}
.data-table thead th {
  color: var(--ink);
  font-weight: 600;
  border-bottom-color: var(--rule-strong);
}

.source-note {
  margin-top: var(--space-5);
  font-size: 0.8125rem;
  line-height: 1.55;
  color: var(--ink-3);
  max-width: 38rem;
  font-family: var(--sans);
}

/* -----------------------------------------------------------------------------
   7b. The plate — interactive mathematical relief of New England

   A drawn figure, not a widget: no frame, no panel, no shadow. The stage is a
   bare canvas sitting on the page; every control below it is set as running
   type with a rule above, in the manner of a plate legend.
   -------------------------------------------------------------------------- */

.plate {
  margin-top: var(--space-6);
}

.plate__kicker {
  font-family: var(--sans);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: var(--space-3);
}

.plate h3 {
  font-family: var(--serif);
  font-size: clamp(1.375rem, 2.4vw, 1.75rem);
  font-weight: 400;
  line-height: 1.24;
  letter-spacing: -0.008em;
  max-width: 34em;
  margin-bottom: var(--space-4);
}

.plate__standfirst {
  max-width: var(--text-col);
  color: var(--ink-2);
  font-size: 1.0625rem;
}

/* The stage. Height is set by aspect ratio so the surface never squashes. */
.plate__stage {
  position: relative;
  width: 100%;
  margin-top: var(--space-6);
  touch-action: none;
  cursor: grab;
  border-radius: 0;
}
.plate__stage:active {
  cursor: grabbing;
}
.plate__stage:focus-visible {
  outline: 1px solid var(--focus);
  outline-offset: 10px;
}
.plate__canvas {
  display: block;
  width: 100%;
  height: auto;
}

.plate__nojs {
  max-width: var(--text-col);
  margin-top: var(--space-4);
  font-size: 0.9375rem;
  color: var(--ink-2);
  border-left: 1px solid var(--rule-strong);
  padding-left: var(--space-4);
}

/* Legend line directly beneath the plate */
.plate__legend {
  margin-top: 0.85rem;
  padding-top: 0.55rem;
  border-top: 1px solid var(--rule);
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.4rem 1.4rem;
  font-family: var(--sans);
  font-size: 0.75rem;
  letter-spacing: 0.02em;
  color: var(--ink-3);
  font-variant-numeric: lining-nums tabular-nums;
}
.plate__key {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}
.plate__key svg {
  display: block;
  overflow: visible;
}
.plate__attitude {
  margin-left: auto;
  color: var(--ink-3);
}
.plate__attitude b {
  color: var(--ink-2);
  font-weight: 500;
}

.plate__hint {
  margin-top: 0.6rem;
  max-width: var(--text-col);
  font-family: var(--sans);
  font-size: 0.75rem;
  line-height: 1.5;
  color: var(--ink-3);
}
.plate__hint kbd {
  font-family: var(--sans);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  color: var(--ink-2);
  border-bottom: 1px solid var(--rule-strong);
  padding: 0 0.12em;
}
.plate__hint .action {
  font-size: 0.8125rem;
  margin-left: 0.35rem;
}

/* Progressive disclosure: the surface definition and its layers */
.surface {
  margin-top: var(--space-5);
  border-top: 1px solid var(--rule);
}
.surface > summary {
  list-style: none;
  cursor: pointer;
  padding: 0.6rem 0 0.55rem;
  font-family: var(--sans);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-2);
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
}
.surface > summary::-webkit-details-marker {
  display: none;
}
.surface > summary::before {
  content: '+';
  font-family: var(--serif);
  font-size: 0.9375rem;
  line-height: 1;
  color: var(--ink-3);
}
.surface[open] > summary::before {
  content: '–';
}
.surface > summary:hover {
  color: var(--ink);
}
.surface > summary:focus-visible {
  outline: 1px solid var(--focus);
  outline-offset: 3px;
}

.surface__body {
  padding-bottom: var(--space-5);
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  gap: var(--space-5) var(--space-7);
  align-items: start;
}
.surface__intro {
  grid-column: 1 / -1;
  max-width: var(--text-col);
  font-size: 0.9375rem;
  color: var(--ink-2);
}
.surface__intro code {
  font-family: var(--serif);
  font-style: italic;
  color: var(--ink);
}

/* Layer list: each row is a switch set as an annotated equation */
.layers {
  list-style: none;
}
.layers > li + li {
  border-top: 1px solid var(--rule);
}
.layer {
  display: grid;
  grid-template-columns: 0.85rem minmax(0, 1fr);
  gap: 0 0.7rem;
  align-items: start;
  width: 100%;
  text-align: left;
  padding: 0.6rem 0;
  color: var(--ink-3);
}
.layer__box {
  width: 0.6875rem;
  height: 0.6875rem;
  margin-top: 0.38rem;
  border: 1px solid var(--rule-strong);
  background: transparent;
}
.layer[aria-pressed='true'] .layer__box {
  background: var(--plot-ink);
  border-color: var(--plot-ink);
}
.layer[data-accent='marker'][aria-pressed='true'] .layer__box {
  background: var(--marker);
  border-color: #b98d00;
}
[data-theme='dark'] .layer[data-accent='marker'][aria-pressed='true'] .layer__box {
  border-color: var(--marker);
}
.layer__name {
  font-family: var(--sans);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  color: inherit;
}
.layer[aria-pressed='true'] {
  color: var(--ink);
}
.layer[aria-pressed='true'] .layer__name {
  font-weight: 600;
}
.layer__expr {
  display: block;
  margin-top: 0.15rem;
  font-family: var(--serif);
  font-style: italic;
  font-size: 0.8125rem;
  line-height: 1.45;
  color: var(--ink-3);
  font-variant-numeric: lining-nums proportional-nums;
}
.layer:hover .layer__name {
  text-decoration: underline;
  text-decoration-color: var(--rule-strong);
  text-underline-offset: 0.2em;
}
.layer:focus-visible {
  outline: 1px solid var(--focus);
  outline-offset: 2px;
}

.surface__aside {
  font-size: 0.8125rem;
  line-height: 1.55;
  color: var(--ink-2);
}
.surface__eq {
  font-family: var(--serif);
  font-style: italic;
  font-size: 0.9375rem;
  color: var(--ink);
  border-bottom: 1px solid var(--rule);
  padding-bottom: 0.5rem;
  margin-bottom: 0.7rem;
  font-variant-numeric: lining-nums proportional-nums;
}
.surface__note {
  color: var(--ink-3);
  font-size: 0.75rem;
  font-family: var(--sans);
  line-height: 1.55;
  margin-top: 0.7rem;
}
.surface__acts {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.5rem;
  border-top: 1px solid var(--rule);
  padding-top: 0.7rem;
}

/* The plate's two disclosures stack as one ruled list. */
.plate .data-table {
  margin-top: 0;
}

/* -----------------------------------------------------------------------------
   8. Index of reports — an annotated bibliography
   -------------------------------------------------------------------------- */

.index {
  counter-reset: entry;
}
.index li {
  counter-increment: entry;
  display: grid;
  grid-template-columns: 2.25rem minmax(0, 1fr);
  gap: 0 0.75rem;
  padding: var(--space-5) 0;
  border-bottom: 1px solid var(--rule);
}
.index li:first-child {
  padding-top: 0;
}
.index li::before {
  content: counter(entry, decimal-leading-zero);
  font-family: var(--sans);
  font-size: 0.75rem;
  color: var(--ink-3);
  font-variant-numeric: lining-nums tabular-nums;
  padding-top: 0.55rem;
}
.index h4 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.3125rem;
  line-height: 1.3;
  letter-spacing: -0.004em;
}
.index h4 a {
  text-decoration-color: var(--rule);
}
.index__annot {
  margin-top: 0.45rem;
  font-size: 1rem;
  line-height: 1.58;
  color: var(--ink-2);
  max-width: 38rem;
}
.index__cite {
  margin-top: 0.6rem;
  font-family: var(--sans);
  font-size: 0.75rem;
  color: var(--ink-3);
  font-variant-numeric: lining-nums tabular-nums;
  display: flex;
  flex-wrap: wrap;
  gap: 0 0.5rem;
  align-items: center;
}
.index__cite span::after {
  content: '·';
  padding-left: 0.5rem;
  color: var(--rule-strong);
}
.index__cite span:last-child::after {
  content: '';
}

/* -----------------------------------------------------------------------------
   9. Calendar ledger
   -------------------------------------------------------------------------- */

.filters {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0 1.15rem;
  font-family: var(--sans);
  font-size: 0.8125rem;
  margin-bottom: var(--space-4);
}
.filter {
  padding-block: 0.4rem;
  color: var(--ink-3);
  border-bottom: 2px solid transparent;
  letter-spacing: 0.02em;
}
.filter:hover {
  color: var(--ink);
}
.filter[aria-pressed='true'],
.filter[aria-selected='true'] {
  color: var(--ink);
  font-weight: 600;
  border-bottom-color: var(--marker);
}
.filters__count {
  margin-left: auto;
  color: var(--ink-3);
  font-variant-numeric: lining-nums tabular-nums;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
}

.ledger {
  border-top: 1px solid var(--rule-strong);
}
.ledger > li {
  display: grid;
  grid-template-columns: 4.75rem minmax(0, 1fr) auto;
  gap: 0 var(--space-4);
  align-items: baseline;
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--rule);
}
.ledger__date {
  font-family: var(--sans);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--ink);
  font-variant-numeric: lining-nums tabular-nums;
  white-space: nowrap;
}
.ledger__date small {
  display: block;
  font-weight: 400;
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-top: 0.15rem;
}
.ledger h4 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.1875rem;
  line-height: 1.32;
}
.ledger__where {
  margin-top: 0.25rem;
  font-family: var(--sans);
  font-size: 0.8125rem;
  color: var(--ink-2);
  line-height: 1.5;
}
.ledger__where i {
  font-style: normal;
  color: var(--ink-3);
}
.ledger__right {
  text-align: right;
  font-family: var(--sans);
  font-size: 0.75rem;
  color: var(--ink-3);
  font-variant-numeric: lining-nums tabular-nums;
  white-space: nowrap;
  line-height: 1.5;
}
.ledger__right em {
  display: block;
  font-style: normal;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  font-size: 0.6875rem;
  color: var(--ink-2);
}
.ledger__right a {
  display: inline-block;
  margin-top: 0.3rem;
  color: var(--brick);
  text-decoration-color: var(--rule-strong);
  font-size: 0.8125rem;
}
.ledger__right a:hover {
  text-decoration-color: var(--brick);
}
.ledger li[data-next='true'] .ledger__date {
  position: relative;
}
.ledger li[data-next='true'] .ledger__date::before {
  content: '';
  position: absolute;
  left: -0.85rem;
  top: 0.42em;
  width: 5px;
  height: 5px;
  background: var(--marker);
}

.empty {
  padding: var(--space-6) 0;
  border-bottom: 1px solid var(--rule);
  color: var(--ink-2);
  font-size: 1rem;
  max-width: 34rem;
}
.empty p + p {
  margin-top: var(--space-3);
}

/* Margin figure: meetings by state, as a dot strip */
.state-strip {
  margin: 0;
  font-family: var(--sans);
}
.state-strip dl {
  margin: 0;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.3rem 0.6rem;
  align-items: center;
  font-size: 0.75rem;
  font-variant-numeric: lining-nums tabular-nums;
}
.state-strip dt {
  color: var(--ink-2);
  white-space: nowrap;
}
.state-strip dd {
  margin: 0;
  display: flex;
  gap: 3px;
  align-items: center;
}
.state-strip dd i {
  width: 5px;
  height: 5px;
  background: var(--ink-2);
  display: block;
}
.state-strip dd[data-lead='true'] i {
  background: var(--marker);
}

/* -----------------------------------------------------------------------------
   10. Colloquium notes
   -------------------------------------------------------------------------- */

.notes {
  border-top: 1px solid var(--rule-strong);
}
.notes > li {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 8.5rem;
  gap: 0 var(--space-4);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--rule);
  align-items: baseline;
}
.notes h4 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: 1.125rem;
  line-height: 1.38;
}
.notes h4 sup {
  font-family: var(--sans);
  font-size: 0.5625rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  font-weight: 600;
  vertical-align: 0.55em;
  margin-left: 0.35em;
  color: var(--ink-3);
  line-height: 0;
}
.notes li[data-state='unanswered'] h4 sup {
  color: var(--brick);
}
.notes li[data-state='solved'] h4 sup {
  color: var(--ink-3);
}
.notes__by {
  margin-top: 0.3rem;
  font-family: var(--sans);
  font-size: 0.75rem;
  color: var(--ink-3);
  font-variant-numeric: lining-nums tabular-nums;
}
.notes__tally {
  text-align: right;
  font-family: var(--sans);
  font-size: 0.75rem;
  color: var(--ink-3);
  font-variant-numeric: lining-nums tabular-nums;
  white-space: nowrap;
}
.notes__tally b {
  color: var(--ink-2);
  font-weight: 600;
}

/* -----------------------------------------------------------------------------
   11. Membership
   -------------------------------------------------------------------------- */

.join {
  border-top: 2px solid var(--rule-ink);
  padding-top: var(--space-6);
}
.join h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(1.6rem, 3.4vw, 2.15rem);
  line-height: 1.16;
  letter-spacing: -0.014em;
  max-width: 20ch;
}
.join p {
  margin-top: var(--space-4);
  color: var(--ink-2);
  max-width: 34rem;
}
.join__ways {
  margin-top: var(--space-6);
  counter-reset: way;
  max-width: 36rem;
}
.join__ways li {
  counter-increment: way;
  position: relative;
  padding: var(--space-3) 0 var(--space-3) 2.4rem;
  border-top: 1px solid var(--rule);
  font-size: 1rem;
  line-height: 1.56;
  color: var(--ink-2);
}
.join__ways li::before {
  content: counter(way) '.';
  position: absolute;
  left: 0;
  top: calc(var(--space-3) + 0.32rem);
  font-family: var(--sans);
  font-size: 0.75rem;
  color: var(--ink-3);
  font-variant-numeric: lining-nums tabular-nums;
}
.join__ways b {
  color: var(--ink);
  font-weight: 600;
}
.join__foot {
  margin-top: var(--space-6);
}

/* -----------------------------------------------------------------------------
   12. Colophon / footer
   -------------------------------------------------------------------------- */

.colophon {
  margin-top: var(--space-10);
  padding: var(--space-6) 0 var(--space-8);
  border-top: 1px solid var(--rule-strong);
}
.colophon__cols {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) repeat(3, minmax(0, 1fr));
  gap: var(--space-6) var(--space-5);
}
.colophon h3 {
  font-family: var(--sans);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: var(--space-3);
}
.colophon__about {
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--ink-2);
  max-width: 30ch;
}
.colophon ul {
  font-family: var(--sans);
  font-size: 0.8125rem;
  line-height: 1.5;
}
.colophon ul li + li {
  margin-top: 0.5rem;
}
.colophon ul a {
  color: var(--ink-2);
  text-decoration-color: transparent;
}
.colophon ul a:hover {
  color: var(--brick);
  text-decoration-color: var(--brick);
}

.colophon__foot {
  margin-top: var(--space-8);
  padding-top: var(--space-4);
  border-top: 1px solid var(--rule);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4) var(--space-6);
  align-items: baseline;
  justify-content: space-between;
  font-family: var(--sans);
  font-size: 0.75rem;
  color: var(--ink-3);
  line-height: 1.6;
}
.colophon__foot p {
  max-width: 52ch;
}
.theme-toggle {
  font-family: var(--sans);
  font-size: 0.75rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--ink-3);
  border-bottom: 1px solid var(--rule-strong);
  padding-block: 0.35rem;
  white-space: nowrap;
}
.theme-toggle:hover {
  color: var(--ink);
  border-bottom-color: var(--marker);
}

/* -----------------------------------------------------------------------------
   13. Reading-width behaviour on small screens
   -------------------------------------------------------------------------- */

@media (max-width: 63.9rem) {
  /* Marginalia rejoin the flow as indented notes rather than floating out. */
  .sidenote {
    float: none;
    width: auto;
    max-width: var(--text-col);
    margin-right: 0;
    margin-top: var(--space-4);
    margin-bottom: var(--space-4);
    border-top: 0;
    border-left: 1px solid var(--rule-strong);
    padding: 0 0 0 var(--space-4);
    font-size: 0.875rem;
  }
}

@media (max-width: 44rem) {
  :root {
    --lead: 1.66;
  }
  body {
    font-size: 1.125rem;
  }
  .lede {
    font-size: 1.1875rem;
  }
  section + section {
    margin-top: var(--space-8);
  }
  .thesis {
    padding-top: var(--space-7);
  }

  .masthead__top {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.5rem;
  }
  .masthead__meta {
    padding-bottom: 0;
  }
  .masthead__nav ul {
    gap: 0 1.15rem;
    font-size: 0.8125rem;
  }
  .masthead__nav li:last-child {
    margin-left: 0;
  }

  .multiples {
    grid-template-columns: 1fr;
    gap: var(--space-2);
  }
  .multiple {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 5.5rem;
    align-items: center;
    gap: var(--space-4);
    padding-block: 0.6rem;
    border-bottom: 1px solid var(--rule);
  }
  .multiple[aria-pressed='true'] {
    border-bottom-color: var(--marker);
  }
  .multiple__name {
    margin-bottom: 0.2rem;
  }
  .multiple svg {
    grid-row: 1 / span 2;
    grid-column: 2;
    height: 30px;
  }
  .multiple__val {
    margin-top: 0;
  }

  .ledger > li {
    grid-template-columns: 3.75rem minmax(0, 1fr);
    gap: 0 var(--space-3);
  }
  .ledger__right {
    grid-column: 2;
    text-align: left;
    margin-top: 0.5rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0 0.75rem;
    align-items: baseline;
  }
  .ledger__right em {
    display: inline;
  }

  .notes > li {
    grid-template-columns: minmax(0, 1fr);
  }
  .notes__tally {
    text-align: left;
    margin-top: 0.4rem;
  }

  .index li {
    grid-template-columns: 1.9rem minmax(0, 1fr);
  }

  .colophon__cols {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-6);
  }
  .colophon__about {
    max-width: none;
  }
}

@media (max-width: 63.9rem) {
  .surface__body {
    grid-template-columns: minmax(0, 1fr);
    gap: var(--space-5);
  }
}

@media (max-width: 44rem) {
  .plate__stage {
    margin-top: var(--space-5);
  }
  .plate__legend {
    gap: 0.35rem 1rem;
  }
  .plate__attitude {
    margin-left: 0;
    width: 100%;
  }
  .plate__standfirst {
    font-size: 1rem;
  }
}

/* Touch: keep every interactive line comfortably tappable. */
@media (pointer: coarse) {
  .masthead__nav a,
  .filter,
  .layer,
  .colophon ul a,
  .theme-toggle,
  .data-table > summary,
  .ledger__right a,
  .index h4 a,
  .notes h4 a {
    min-height: 44px;
    display: inline-flex;
    align-items: center;
  }
  .index h4 a,
  .notes h4 a {
    display: inline;
    min-height: 0;
  }
  .index h4,
  .notes h4 {
    padding-block: 0.25rem;
  }
}

@media print {
  .masthead__nav,
  .theme-toggle,
  .filters {
    display: none;
  }
  body {
    background: #fff;
    color: #000;
    font-size: 10.5pt;
  }
}