/* ==========================================================================
   Cost-Aware Protocol Routing - project page
   Original stylesheet. Monochrome page chrome so that the five protocol
   colors are the only chromatic signal on the page (they carry data meaning).
   ========================================================================== */

:root {
  /* Page chrome: monochrome ink on warm paper */
  --paper:        #FBFAF7;
  --paper-2:      #F3F1EC;
  --paper-3:      #EAE7E0;
  --ink:          #16191C;
  --ink-2:        #3A4046;
  --ink-3:        #5C646C;
  --rule:         #D8D4CB;
  --rule-strong:  #B6B1A6;
  --card:         #FFFFFF;
  --focus:        #1A56DB;
  --code-bg:      #F2F0EA;

  /* Protocol palette - fixed by the paper's figure code, do not alter */
  --p-baseline:   #4C78A8;
  --p-single:     #F58518;
  --p-per:        #54A24B;
  --p-broadcast:  #B279A2;
  --p-none:       #9C9C9C;

  --maxw: 1080px;
  --nav-h: 56px;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(22,25,28,.06), 0 8px 24px rgba(22,25,28,.05);
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto, "Helvetica Neue", Arial, sans-serif;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Source Serif 4", Georgia, serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper:       #14171A;
    --paper-2:     #1B1F23;
    --paper-3:     #23282D;
    --ink:         #ECEAE5;
    --ink-2:       #C6C3BC;
    --ink-3:       #9EA5AC;
    --rule:        #333A40;
    --rule-strong: #4A535B;
    --card:        #1B1F23;
    --focus:       #8AB4F8;
    --code-bg:     #1F2429;
    --shadow: 0 1px 2px rgba(0,0,0,.4), 0 8px 24px rgba(0,0,0,.3);
  }
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 16px); }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.62;
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  overflow-wrap: break-word;
}

img { max-width: 100%; height: auto; display: block; }

a { color: var(--ink); text-decoration: underline; text-underline-offset: 2px; text-decoration-thickness: 1px; text-decoration-color: var(--rule-strong); }
a:hover { text-decoration-color: currentColor; }
a:focus-visible, button:focus-visible, input:focus-visible, summary:focus-visible, [tabindex]:focus-visible {
  outline: 3px solid var(--focus); outline-offset: 2px; border-radius: 3px;
}

.skip {
  position: absolute; left: -9999px; top: 0; z-index: 200;
  background: var(--ink); color: var(--paper); padding: 10px 16px; border-radius: 0 0 8px 0;
  text-decoration: none; font-weight: 600;
}
.skip:focus { left: 0; }

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding-inline: 20px; }

/* ---------- sticky nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  -webkit-backdrop-filter: saturate(160%) blur(10px);
  backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--rule);
}
@supports not (backdrop-filter: blur(4px)) { .nav { background: var(--paper); } }

.nav-inner {
  max-width: var(--maxw); margin: 0 auto; padding-inline: 20px;
  min-height: var(--nav-h);
  display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
}
.nav-brand {
  font-weight: 700; font-size: .82rem; letter-spacing: .1em; text-transform: uppercase;
  text-decoration: none; white-space: nowrap; color: var(--ink);
  border-left: 3px solid var(--p-baseline); padding-left: 8px;
}
.nav-links {
  display: flex; gap: 2px; list-style: none; margin: 0; padding: 0;
  overflow-x: auto; flex: 1 1 260px; scrollbar-width: thin;
}
.nav-links a {
  display: block; padding: 6px 9px; font-size: .84rem; white-space: nowrap;
  text-decoration: none; color: var(--ink-2); border-radius: 6px;
}
.nav-links a:hover { background: var(--paper-3); color: var(--ink); }
.nav-links a[aria-current="true"] { color: var(--ink); font-weight: 650; box-shadow: inset 0 -2px 0 var(--ink); }

.search-wrap { position: relative; flex: 0 0 auto; }
#site-search {
  font: inherit; font-size: .84rem; width: 150px; padding: 6px 10px;
  border: 1px solid var(--rule-strong); border-radius: 7px;
  background: var(--card); color: var(--ink);
}
#site-search::placeholder { color: var(--ink-3); }
.search-results {
  position: absolute; right: 0; top: calc(100% + 6px); z-index: 120;
  width: min(380px, 84vw); max-height: 60vh; overflow-y: auto;
  background: var(--card); border: 1px solid var(--rule-strong);
  border-radius: var(--radius); box-shadow: var(--shadow);
  list-style: none; margin: 0; padding: 6px;
}
.search-results[hidden] { display: none; }
.search-results li { margin: 0; }
.search-results a { display: block; padding: 8px 10px; text-decoration: none; border-radius: 7px; }
.search-results a:hover, .search-results a:focus-visible { background: var(--paper-3); }
.search-results .sr-title { display: block; font-weight: 650; font-size: .9rem; }
.search-results .sr-snip { display: block; font-size: .8rem; color: var(--ink-3); }
.search-results .sr-empty { padding: 10px; font-size: .86rem; color: var(--ink-3); }

/* ---------- hero ---------- */
.hero { padding-block: 40px 28px; border-bottom: 1px solid var(--rule); }
.ladder { display: flex; gap: 4px; margin-bottom: 20px; }
.ladder span { height: 6px; border-radius: 3px; }
.ladder span:nth-child(1) { flex: 1;  background: var(--p-baseline); }
.ladder span:nth-child(2) { flex: 2;  background: var(--p-single); }
.ladder span:nth-child(3) { flex: 4;  background: var(--p-per); }
.ladder span:nth-child(4) { flex: 6;  background: var(--p-broadcast); }

.badge {
  display: inline-block; background: var(--ink); color: var(--paper);
  font-size: .75rem; font-weight: 700; letter-spacing: .09em; text-transform: uppercase;
  padding: 6px 13px; border-radius: 999px; margin-bottom: 16px;
}
h1.title {
  font-family: var(--serif);
  font-size: clamp(1.55rem, 4.1vw, 2.55rem);
  line-height: 1.2; font-weight: 700; margin: 0 0 6px; letter-spacing: -.012em;
}
h1.title .sub { display: block; font-size: .78em; font-weight: 600; color: var(--ink-2); margin-top: .28em; }

.authors { margin: 20px 0 6px; font-size: 1.02rem; line-height: 1.85; }
.authors .au { white-space: nowrap; font-weight: 600; }
.authors .au sup { font-weight: 600; font-size: .7em; color: var(--ink-3); }
.authors .sep { color: var(--ink-3); }
.affil { margin: 0; font-size: .92rem; color: var(--ink-2); }
.affil sup { font-size: .72em; }
.affil .contact { font-family: var(--mono); font-size: .87em; }

.btnrow { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 22px; }
.btn {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 9px 16px; border-radius: 8px; font-size: .9rem; font-weight: 620;
  text-decoration: none; border: 1px solid var(--rule-strong);
  background: var(--card); color: var(--ink);
}
.btn:hover { background: var(--paper-3); border-color: var(--ink-3); }
.btn.primary { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.btn.primary:hover { background: var(--ink-2); border-color: var(--ink-2); }
.btn .gl { font-size: 1.05em; line-height: 1; }

/* ---------- sections ---------- */
main section { padding-block: 40px; border-bottom: 1px solid var(--rule); }
main section:last-of-type { border-bottom: 0; }
h2 {
  font-family: var(--serif); font-size: clamp(1.32rem, 2.9vw, 1.78rem);
  line-height: 1.25; margin: 0 0 4px; letter-spacing: -.008em;
}
h2 .kicker {
  display: block; font-family: var(--sans); font-size: .7rem; font-weight: 700;
  letter-spacing: .13em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 7px;
}
h3 { font-size: 1.06rem; margin: 26px 0 6px; line-height: 1.35; }
h4 { font-size: .96rem; margin: 18px 0 4px; }
p { margin: 0 0 14px; max-width: 74ch; }
ul, ol { max-width: 74ch; padding-left: 1.2em; }
li { margin-bottom: 7px; }
.lede { font-size: 1.06rem; color: var(--ink-2); max-width: 70ch; }

.finding {
  border-left: 4px solid var(--ink); background: var(--paper-2);
  padding: 18px 20px; border-radius: 0 var(--radius) var(--radius) 0; margin: 4px 0 8px;
}
.finding p { font-family: var(--serif); font-size: clamp(1.05rem, 2.2vw, 1.28rem); line-height: 1.5; margin: 0; max-width: 62ch; }

.callout {
  border: 1px solid var(--rule-strong); background: var(--paper-2);
  border-radius: var(--radius); padding: 15px 18px; margin: 18px 0;
}
.callout p:last-child, .callout ul:last-child { margin-bottom: 0; }
.callout .ct { font-weight: 700; font-size: .78rem; letter-spacing: .09em; text-transform: uppercase; color: var(--ink-2); display: block; margin-bottom: 6px; }
.callout.warn { border-left: 4px solid var(--p-single); }

/* ---------- figures ---------- */
figure { margin: 22px 0; }
figure img { border: 1px solid var(--rule); border-radius: var(--radius); background: #FFFFFF; padding: 8px; }
figcaption { font-size: .86rem; color: var(--ink-2); margin-top: 9px; max-width: 80ch; }
figcaption b { color: var(--ink); }

/* ---------- protocol cards ---------- */
.protocols { display: grid; grid-template-columns: repeat(auto-fit, minmax(215px, 1fr)); gap: 14px; margin: 22px 0 10px; }
.pcard { background: var(--card); border: 1px solid var(--rule); border-radius: var(--radius); padding: 15px 16px; border-top: 4px solid var(--pc, var(--ink)); }
.pcard h3 { margin: 0 0 4px; font-size: 1.02rem; display: flex; align-items: center; gap: 8px; }
.chip { width: 13px; height: 13px; border-radius: 3px; background: var(--pc); flex: 0 0 auto; border: 1px solid rgba(0,0,0,.22); }
.pcard p { font-size: .9rem; margin: 0 0 10px; }
.pcard dl { margin: 0; font-size: .84rem; display: grid; grid-template-columns: auto 1fr; gap: 2px 10px; }
.pcard dt { color: var(--ink-3); }
.pcard dd { margin: 0; font-variant-numeric: tabular-nums; font-weight: 640; }
.pc-baseline  { --pc: var(--p-baseline); }
.pc-single    { --pc: var(--p-single); }
.pc-per       { --pc: var(--p-per); }
.pc-broadcast { --pc: var(--p-broadcast); }
.pc-none      { --pc: var(--p-none); }

.chiprow { display: flex; flex-wrap: wrap; gap: 8px 16px; margin: 12px 0 0; padding: 0; list-style: none; font-size: .87rem; }
.chiprow li { display: flex; align-items: center; gap: 7px; margin: 0; }

/* ---------- two-column compare ---------- */
.compare { display: grid; grid-template-columns: repeat(auto-fit, minmax(270px, 1fr)); gap: 16px; margin: 22px 0; }
.compare > div { background: var(--card); border: 1px solid var(--rule); border-radius: var(--radius); padding: 16px 18px; }
.compare h3 { margin-top: 0; }
.compare .q { font-family: var(--serif); font-size: 1.05rem; font-style: italic; color: var(--ink-2); margin-bottom: 10px; }
.verdict { font-size: .8rem; font-weight: 700; letter-spacing: .07em; text-transform: uppercase; padding: 3px 9px; border-radius: 999px; display: inline-block; margin-bottom: 10px; border: 1px solid var(--rule-strong); }
.verdict.good { background: #E4F1E2; color: #1E4A19; border-color: #7EB477; }
.verdict.bad  { background: #F7E6D6; color: #6B3608; border-color: #D79A57; }
@media (prefers-color-scheme: dark) {
  .verdict.good { background: #1D2E1B; color: #B7DCB1; border-color: #3E6238; }
  .verdict.bad  { background: #33230F; color: #EBC08A; border-color: #6B4A1E; }
}

/* ---------- tables ---------- */
.table-scroll { overflow-x: auto; margin: 16px 0 6px; border: 1px solid var(--rule); border-radius: var(--radius); background: var(--card); -webkit-overflow-scrolling: touch; }
table { border-collapse: collapse; width: 100%; font-size: .87rem; min-width: 540px; }
caption { text-align: left; font-size: .86rem; color: var(--ink-2); padding: 12px 14px 10px; border-bottom: 1px solid var(--rule); }
caption b { color: var(--ink); }
th, td { padding: 8px 12px; text-align: right; border-bottom: 1px solid var(--rule); white-space: nowrap; }
th[scope="col"] { font-size: .76rem; letter-spacing: .04em; text-transform: uppercase; color: var(--ink-2); font-weight: 700; vertical-align: bottom; background: var(--paper-2); }
th[scope="row"], td.l, th.l { text-align: left; }
th[scope="row"] { font-weight: 600; }
tbody tr:last-child th, tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover { background: var(--paper-2); }
tr.hl th, tr.hl td { background: var(--paper-3); font-weight: 680; }
tr.hl:hover th, tr.hl:hover td { background: var(--paper-3); }
.num { font-variant-numeric: tabular-nums; }
.ci { color: var(--ink-3); font-size: .93em; }
.tnote { font-size: .82rem; color: var(--ink-3); margin: 8px 0 0; max-width: 80ch; }
.swatch { display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 7px; border: 1px solid rgba(0,0,0,.22); vertical-align: baseline; }
.scrollhint { font-size: .78rem; color: var(--ink-3); margin: 6px 0 0; }

details { border: 1px solid var(--rule); border-radius: var(--radius); padding: 0; margin: 16px 0; background: var(--card); }
details > summary { cursor: pointer; padding: 12px 16px; font-weight: 640; font-size: .92rem; list-style-position: inside; }
details[open] > summary { border-bottom: 1px solid var(--rule); }
details .dbody { padding: 4px 16px 14px; }
details .dbody > .table-scroll { border: 0; border-radius: 0; margin-top: 8px; }

/* ---------- code ---------- */
pre {
  background: var(--code-bg); border: 1px solid var(--rule); border-radius: var(--radius);
  padding: 14px 16px; overflow-x: auto; font-family: var(--mono); font-size: .82rem; line-height: 1.6; margin: 14px 0;
}
code { font-family: var(--mono); font-size: .89em; background: var(--code-bg); padding: 1px 5px; border-radius: 4px; }
pre code { background: none; padding: 0; font-size: 1em; }
.copyrow { display: flex; justify-content: flex-end; margin-top: -8px; }
.copybtn { font: inherit; font-size: .8rem; font-weight: 620; padding: 5px 12px; border-radius: 7px; border: 1px solid var(--rule-strong); background: var(--card); color: var(--ink); cursor: pointer; }
.copybtn:hover { background: var(--paper-3); }

/* ---------- team ---------- */
.team { list-style: none; padding: 0; margin: 18px 0 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 12px; }
.team li { background: var(--card); border: 1px solid var(--rule); border-radius: var(--radius); padding: 12px 14px; margin: 0; }
.team .nm { font-weight: 650; display: block; }
.team .af { font-size: .84rem; color: var(--ink-3); }

.kv { display: grid; grid-template-columns: auto 1fr; gap: 4px 14px; font-size: .92rem; margin: 14px 0 0; max-width: 74ch; }
.kv dt { color: var(--ink-3); }
.kv dd { margin: 0; }

footer.site {
  padding-block: 28px 44px; font-size: .86rem; color: var(--ink-3);
  border-top: 1px solid var(--rule); background: var(--paper-2);
}
footer.site p { max-width: 80ch; margin-bottom: 8px; }
.totop { font-size: .86rem; }


/* The section list is wrapped in <details> so phones can collapse it. On wider
   screens that wrapper must be inert: hide the toggle and always show the list,
   regardless of the element's open state. */
.nav-collapse > summary { display: none; }
.nav-collapse .nav-links { display: flex; }

/* ---------- narrow screens ---------- */
@media (max-width: 720px) {
  body { font-size: 15.5px; }
  .wrap, .nav-inner { padding-inline: 16px; }
  .hero { padding-block: 26px 22px; }
  main section { padding-block: 30px; }
  .nav-inner { padding-block: 8px; gap: 8px; }
  .nav-brand { font-size: .72rem; }

  /* On a phone the nav was 12 links plus a full-width search box, which wrapped
     to two rows and consumed a large share of the first screen before the paper
     title. Collapse it behind a toggle: the brand and the toggle stay, the rest
     opens on demand. The <details> element gives us this with no JavaScript, so
     it still works if the script fails to load. */
  .nav-inner { flex-wrap: wrap; align-items: center; }
  /* The toggle sits beside the brand on one row. Only when it is opened does
     the link list take vertical space, so the closed nav is a single short bar
     and the paper title stays near the top of the first screen. */
  .nav-collapse { display: contents; }
  .nav-collapse > summary { margin-left: auto; }
  .nav-collapse .nav-links { flex: 1 1 100%; }
  .nav-collapse > summary {
    display: block;          /* overrides the desktop rule that hides the toggle */
    list-style: none;
    cursor: pointer;
    padding: 6px 2px;
    font-size: .8rem;
    font-weight: 600;
    color: var(--accent, #4C78A8);
  }
  .nav-collapse > summary::-webkit-details-marker { display: none; }
  .nav-collapse > summary::after { content: " \25BE"; }
  .nav-collapse[open] > summary::after { content: " \25B4"; }
  .nav-collapse:not([open]) .nav-links { display: none; }
  .nav-collapse[open] .nav-links { display: flex; }
  .nav-collapse .nav-links {
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
    overflow: visible;
    padding-block: 4px 8px;
  }
  .nav-collapse .nav-links a { display: block; padding: 7px 2px; }
  .search-wrap { order: 3; flex: 1 1 100%; }
  #site-search { width: 100%; }
  .search-results { right: auto; left: 0; width: 100%; }
  .btn { padding: 8px 13px; font-size: .86rem; }
  .authors { font-size: .96rem; line-height: 1.95; }
  table { font-size: .82rem; min-width: 480px; }
  th, td { padding: 7px 9px; }
}
@media print {
  .nav, .copyrow, .skip, .scrollhint { display: none !important; }
  body { background: #fff; color: #000; }
  details { border: 0; } details[open] .dbody { padding: 0; }
}

/* ---------- reproduction entry points ---------- */
.repro { display: grid; grid-template-columns: repeat(auto-fit, minmax(265px, 1fr)); gap: 16px; margin: 22px 0 10px; }
.rcard { background: var(--card); border: 1px solid var(--rule); border-radius: var(--radius); padding: 16px 18px; display: flex; flex-direction: column; }
.rcard .rtag { font-size: .7rem; font-weight: 700; letter-spacing: .12em; text-transform: uppercase; color: var(--ink-3); margin: 0 0 6px; }
.rcard h3 { margin: 0 0 6px; font-size: 1.05rem; }
.rcard .rcost { font-size: .82rem; color: var(--ink-2); margin: 0 0 10px; padding-bottom: 10px; border-bottom: 1px solid var(--rule); }
.rcard p { font-size: .91rem; }
.rcard pre { font-size: .81rem; padding: 10px 12px; margin: 10px 0; }
.rcard > p:last-child { margin-top: auto; margin-bottom: 0; padding-top: 6px; font-size: .88rem; font-weight: 600; }
.rcard:nth-child(1) { border-top: 4px solid var(--p-baseline); }
.rcard:nth-child(2) { border-top: 4px solid var(--p-per); }
.rcard:nth-child(3) { border-top: 4px solid var(--p-broadcast); }

/* Long URLs in definition lists must not push the page wider than the
   viewport. Measured at 390px: .kv <dd> anchors caused 54px of overflow. */
.kv dd, .kv dd a, .kv dd code { min-width: 0; overflow-wrap: anywhere; word-break: break-word; }
.rcard p a { overflow-wrap: anywhere; }
@media (max-width: 560px) {
  .kv { grid-template-columns: 1fr; gap: 0 0; }
  .kv dt { margin-top: 10px; font-size: .82rem; letter-spacing: .04em; text-transform: uppercase; }
  .kv dd { margin-bottom: 2px; }
}

/* ---------------------------------------------------------------------------
   Click-to-zoom figures.

   The paper's figures are exported at print resolution (fig2 is 3961x1328, a
   10x5 heatmap with in-cell percentages). At the ~1040px content width they
   downscale almost 4x and the in-cell numbers become unreadable. Rather than
   re-render and risk changing a published value, each figure links to its own
   full-resolution file so a reader can open it at native size.
   --------------------------------------------------------------------------- */
a.figzoom {
  display: block;
  position: relative;
  border-radius: 6px;
  outline-offset: 3px;
  /* A tooltip is not an affordance: it needs a pointer, a hover, and a wait,
     and it does not exist at all on touch. Show the cursor change, and keep a
     persistent caption (below) so the zoom is discoverable without hovering. */
  cursor: zoom-in;
}
a.figzoom img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 6px;
}
a.figzoom::after {
  content: "\2921  open full size";
  display: block;
  margin-top: 6px;
  font-size: .82rem;
  line-height: 1.3;
  color: var(--accent, #4C78A8);
  font-variant-numeric: tabular-nums;
}
a.figzoom:hover::after,
a.figzoom:focus-visible::after { text-decoration: underline; }

/* Author profile links. Styling is ready so adding one is a single <a> tag;
   see the comment beside the author list in index.html. */
.authors a.aulink { color: inherit; text-decoration: none; border-bottom: 1px solid var(--rule, #d9dfe8); }
.authors a.aulink:hover,
.authors a.aulink:focus-visible { color: var(--accent, #4C78A8); border-bottom-color: currentColor; }

/* Author links inside the Team list share the hero link styling. */
.team a.aulink { color: inherit; text-decoration: none; border-bottom: 1px solid var(--rule, #d9dfe8); }
.team a.aulink:hover,
.team a.aulink:focus-visible { color: var(--accent, #4C78A8); border-bottom-color: currentColor; }

/* The desktop section strip scrolls horizontally when the window is too narrow
   for all 12 links. A CSS mask was tried and removed: it dimmed the last link
   even when everything fit, which looked like a rendering fault rather than an
   affordance. Instead, let the strip shrink less aggressively and give the
   scrollbar a visible, thin track so the overflow is self-evident. */
@media (min-width: 721px) {
  .nav-links {
    flex: 1 1 auto;
    scrollbar-width: thin;
    scroll-padding-inline: 8px;
  }
  .nav-links::-webkit-scrollbar { height: 4px; }
  .nav-links::-webkit-scrollbar-thumb {
    background: var(--rule, #d9dfe8);
    border-radius: 4px;
  }
}

/* ---------------------------------------------------------------------------
   Figure sizing and pairing.

   Two problems this solves. First, the two confidence figures are near-square
   (1849x1609 and 1946x1927), so at full content width each rendered ~900-1030px
   tall -- one figure filling an entire laptop viewport, with the caption pushed
   off-screen. Second, they are the only two figures that belong to the SAME
   narrative section, so pairing them is meaningful rather than decorative;
   fig1 and fig2 stand alone in their own sections and stay full width.
   --------------------------------------------------------------------------- */
.figpair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
  align-items: start;
  margin-block: 18px;
}
.figpair figure { margin: 0; }

/* A hard ceiling so no single figure can dominate the fold, whatever its
   intrinsic aspect ratio. object-fit keeps the whole plot visible rather than
   cropping it -- a cropped chart is worse than a small one. */
.figpair img {
  max-height: 60vh;
  width: 100%;
  height: auto;
  object-fit: contain;
}

/* Full-width figures get a ceiling too, but a taller one: they are wide and
   short, so they were never the problem. */
main figure > a.figzoom > img,
main figure > img {
  max-height: 78vh;
  object-fit: contain;
}

@media (max-width: 860px) {
  /* Stack rather than squeeze: two half-width charts on a phone are unreadable
     in a way that one full-width chart is not. */
  .figpair { grid-template-columns: 1fr; gap: 14px; }
  .figpair img { max-height: none; }
}