/* content.css - sections, headings, math blocks, theorems, forms,
   curve player, tables, galleries, figures, footer. Modern Ink. */

/* sections read as an editorial column: open, separated by a hairline rule */
.wrap > section {
  padding: 34px 0 8px;
  margin: 0;
  border-top: 1px solid var(--rule);
}
.wrap > section:first-of-type {
  border-top: none;
}

h2.h {
  font-family: var(--serif);
  font-size: 24px;
  font-weight: 560;
  letter-spacing: -0.01em;
  margin: 0 0 14px;
  display: flex;
  align-items: center;
  gap: 16px;
  line-height: 1.2;
}
h2.h .cm {
  display: none;
} /* drop the // marker */
h2.h .id {
  font-family: var(--serif);
  font-size: 31px;
  font-weight: 600;
  letter-spacing: 0;
  color: var(--accent);
  border-right: 1px solid color-mix(in srgb, var(--accent) 30%, var(--rule));
  padding: 0 16px 0 0;
  flex: none;
  line-height: 1;
}
.note {
  color: var(--dim);
  font-size: 14.5px;
  line-height: 1.5;
}
.forms .row {
  border: none;
  border-top: 1px solid var(--rule);
  margin: 0;
  background: transparent;
}
.forms .row:last-child {
  border-bottom: 1px solid var(--rule);
}
.forms .row > button {
  all: unset;
  box-sizing: border-box;
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
  cursor: pointer;
  padding: 16px 4px;
  font-family: var(--serif);
  font-size: 18px;
}
.forms .row > button:hover {
  color: var(--accent);
}
.forms .row .arr {
  color: var(--accent);
  transition: transform 0.25s;
  font-size: 1.2em;
}
.forms .row.open .arr {
  transform: rotate(90deg);
}
.forms .row .panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}
.forms .row.open .panel {
  max-height: 360px;
}
.forms .row .panel .inner {
  padding: 2px 4px 18px;
}
.player-top .note {
  font-style: italic;
}
.tasks button.on {
  background: var(--ink);
  color: #fff;
  border-color: var(--ink);
}

/* tables / kill-fraction bars / galleries */
table {
  border-collapse: collapse;
  width: 100%;
  font-family: var(--sans);
  font-size: 14px;
  margin: 16px 0;
}
th,
td {
  border-bottom: 1px solid var(--rule);
  padding: 9px 12px;
  text-align: right;
}
th:first-child,
td:first-child {
  text-align: left;
}
thead th {
  background: transparent;
  color: var(--ink);
  font-weight: 600;
  border-bottom: 2px solid var(--ink);
}
h3.grp {
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--dim);
  margin: 30px 0 4px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--rule);
}

/* two small side-by-side explanatory figures */
.twofig {
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
  justify-content: center;
  margin: 18px 0;
}
.twofig figure {
  flex: 1 1 220px;
  max-width: 320px;
  margin: 0;
  border: 1px solid var(--rule);
  border-radius: 6px;
  background: var(--card);
  padding: 12px 12px 8px;
}
.twofig figure > img {
  display: block;
  width: 100%;
  height: auto;
  margin: 2px auto 0;
  background: #fff;
  border-radius: 2px;
}
.twofig figcaption {
  margin-top: 8px;
}
.algo-tab.on {
  background: var(--ink);
  color: #fff;
}
.algo-tab:not(.on):hover {
  background: var(--card);
}

/* generic figure captions (overview duo / inline figures) */
figcaption.note {
  font-style: italic;
}

/* footer + authors - light, hairline top */
footer {
  border-top: 1px solid var(--rule);
  background: var(--paper);
  margin-top: 56px;
  padding: 40px 0 64px;
  color: var(--dim);
  font-family: var(--sans);
  font-size: 13.5px;
  line-height: 1.6;
}
footer .wrap {
}
footer a {
  color: var(--accent);
}
.authors {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
  margin-top: 6px;
}
.author {
  display: flex;
  gap: 14px;
  align-items: center;
}
.author img {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: 1px solid var(--rule);
  object-fit: cover;
  background: var(--card);
}
/* equal-contribution footnote, sat right under the author lists (header + footer) */
.eqnote {
  font-family: var(--sans);
  font-size: 12.5px;
  color: var(--dim);
  letter-spacing: 0.01em;
  margin: 8px 0 12px;
}
.author .nm {
  font-weight: 600;
  color: var(--ink);
}
.author .meta {
  font-size: 13px;
  line-height: 1.5;
}
.author .meta a {
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 32%, transparent);
}

/* ---------- editorial details ---------- */

/* drop cap on the opening paragraph */
.lead::first-letter {
  float: left;
  font-family: var(--serif);
  font-weight: 600;
  color: var(--accent);
  font-size: 3.1em;
  line-height: 0.8;
  padding: 7px 11px 0 0;
}

/* section heading: a hairline rule trails the title to the right margin,
   tinted with the accent so the indigo threads through the whole line */
h2.h::after {
  content: "";
  flex: 1 1 auto;
  align-self: center;
  height: 1px;
  background: linear-gradient(90deg, color-mix(in srgb, var(--accent) 24%, var(--rule)), transparent);
  margin-left: 8px;
}

/* accent list markers, with a touch more air */
section ul {
  padding-left: 1.25em;
}
section ul li {
  margin: 0.3em 0;
  padding-left: 0.2em;
}
section ul li::marker {
  color: var(--accent);
}

/* tabular figures so columns and readouts line up */
table,
.curve-legend,
.killrow,
.player-top .note {
  font-variant-numeric: tabular-nums;
}

/* tidy line breaks */
h1,
h2.h,
.hero-title,
.title {
  text-wrap: balance;
}
p,
.lead,
.note,
figcaption {
  text-wrap: pretty;
}