css/style.css

/* ============================================================================
   Site-specific styles for "Multilinguality at the Edge".
   Base typography, tokens, and components (.btn, .panel, .caption) come from
   chia.css — this file only adds page-specific layout and interactives.
   ============================================================================ */

section { scroll-margin-top: 1rem; }

/* Shown only on mobile (narrow viewport or touch-only device). */
.mobile-note { display: none; font-style: italic; margin: 0 0 1.5rem; }
@media (max-width: 820px), (hover: none) and (pointer: coarse) {
  .mobile-note { display: block; }
}

/* Subheadings ("How are edge LMs developed?", pipeline stage titles):
   Univers Light, leading 110% of font size, tracking -5 (-0.005em). */
h3 {
  font-family: var(--font-body);
  font-size: 1.35rem;
  font-weight: 300;
  line-height: 1.1;
  letter-spacing: -0.005em;
  color: var(--ink);
  margin: 2.2rem 0 0.6rem;
}

/* ---------- header ---------- */

.letterhead { display: flex; align-items: center; gap: 1.25rem; margin-bottom: 2rem; }
.letterhead img { height: 44px; width: auto; }

.site-header .subtitle {
  font-family: var(--font-heading);
  font-size: 1.35rem;
  font-weight: 400;
  color: var(--ink);
  margin: 0 0 1.25rem;
  text-wrap: balance;
}

.site-header .authors { font-size: 1.05rem; margin: 0 0 0.5rem; }
.site-header .authors > a { font-weight: 400; }
.site-header .authors .aff { color: var(--muted); font-size: 0.95rem; }

.site-header .top-links { display: flex; flex-wrap: wrap; gap: 0.75rem; margin: 1.6rem 0 2.6rem; }
.site-header .top-links .btn { border-bottom-width: 1.5px; }  /* keep .btn border on <a> hover */

/* ---------- abstract (teaser + toggle-able full abstract) ---------- */

.abstract { font-size: 1.08rem; }
details.abstract-full { margin-top: 1.4rem; }
details.abstract-full summary {
  cursor: pointer;
  font-family: var(--font-heading);
  font-weight: 600;
  color: var(--blue);
  list-style: none;
}
details.abstract-full summary::-webkit-details-marker { display: none; }
details.abstract-full summary::before { content: "\25B8  "; }
details.abstract-full[open] summary::before { content: "\25BE  "; }
.abstract-box { margin-top: 1rem; }
.abstract-box p { font-size: 0.92rem; line-height: 1.7; color: var(--muted); margin: 0; }

/* ---------- callouts ----------
   Big Univers Light statement in brand blue, used to emphasise a
   single-sentence thesis (the research question, the approach). Headline
   spec: leading tracks the font size (110% at this scale), tracking -5
   (-0.005em). */

.callout {
  font-size: 1.6rem;
  line-height: 1.1;
  font-weight: 300;
  color: var(--blue);
  margin: 1.6rem 0;
  letter-spacing: -0.005em;
  text-wrap: balance;
}

@media (max-width: 640px) {
  .callout { font-size: 1.3rem; }
}

/* ---------- inline citation ----------
   Use: <a class="cite" href="...">(Author et al., 2021)</a> */

a.cite { font-size: 0.88em; white-space: nowrap; margin-left: 0.2em; }

/* ---------- figures ---------- */

.placeholder {
  color: var(--muted);
  text-align: center;
  padding: 2rem 0;
  opacity: 0.7;
  font-size: 0.9rem;
}

.caption strong { color: var(--ink); margin-right: 0.35em; }

/* Square figure + caption-on-the-right row. Figure is intentionally wider
   than the caption so the image reads as the lead element. */
.figure-row {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr);
  gap: 1.75rem;
  align-items: center;
  margin: 1.75rem 0;
}
.figure-row .figure-mount {
  aspect-ratio: 1 / 1;
  min-height: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0;
  padding: 1rem;
}

@media (max-width: 640px) {
  .figure-row { grid-template-columns: 1fr; gap: 1rem; }
  .figure-row .figure-mount { max-width: 280px; margin: 0 auto; }
}

/* Two figures side-by-side, each with its own caption directly below. */
.figure-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.75rem;
  margin: 2rem 0;
}
.figure-pair figure { margin: 0; display: flex; flex-direction: column; }
.figure-pair .figure-mount {
  min-height: 220px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem;
  margin: 0 0 0.75rem;
}
.figure-pair .figure-mount.svg-loaded { align-items: stretch; justify-content: stretch; }
.figure-mount svg { display: block; width: 100%; height: auto; max-width: 100%; }

@media (max-width: 640px) {
  .figure-pair { grid-template-columns: 1fr; gap: 1.25rem; }
}

/* Figure on the left + caption on the right inside each analysis tab. */
.analysis-figure {
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr);
  gap: 1.75rem;
  align-items: start;
  margin: 1.5rem 0 0;
}
.analysis-figure .figure-mount {
  min-height: 320px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem;
  margin: 0;
}
.analysis-figure figcaption { padding-top: 0.25rem; }

@media (max-width: 820px) {
  .analysis-figure { grid-template-columns: 1fr; gap: 1rem; }
}

/* ---------- fig-model-sizes interactive bits ---------- */

#fig-2b .model-name text { transition: fill 100ms ease; }
#fig-2b .model-name:hover text { fill: var(--blue); text-decoration: underline; }
#fig-2b .model-dot { transition: fill 100ms ease; }

.model-tooltip {
  position: fixed;
  z-index: 1000;
  max-width: 320px;
  padding: 0.7rem 0.85rem;
  background: var(--white);
  border: 1.5px solid var(--ink);
  box-shadow: var(--shadow-sm);
  font-size: 0.88rem;
  line-height: 1.4;
  opacity: 0;
  pointer-events: none;
  transition: opacity 120ms ease;
}
.model-tooltip.is-visible { opacity: 1; pointer-events: auto; }
.model-tooltip .model-tooltip-name {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--blue);
  margin-bottom: 0.35rem;
}
.model-tooltip .model-tooltip-desc .muted { font-style: italic; }
.model-tooltip .model-tooltip-links {
  margin-top: 0.55rem;
  padding-top: 0.5rem;
  border-top: 1px dashed var(--rule);
  font-size: 0.85rem;
}
.model-tooltip a + a { margin-left: 0.6rem; }

/* ---------- fig-literature-clusters interactivity ---------- */

#fig-how svg .cluster-group,
#fig-how svg .cluster-label { transition: opacity 150ms ease; }
#fig-how svg.has-active .cluster-group:not(.is-active),
#fig-how svg.has-active .cluster-label:not(.is-active) { opacity: 0.12; }
#fig-how svg.has-active .cluster-noise { opacity: 0.08; }
#fig-how svg .cluster-group.is-active { opacity: 1; }

.cluster-tooltip {
  position: fixed;
  z-index: 1000;
  max-width: 360px;
  padding: 0.7rem 0.85rem 0.85rem;
  background: var(--white);
  border: 1.5px solid var(--ink);
  box-shadow: var(--shadow-sm);
  font-size: 0.86rem;
  line-height: 1.4;
  opacity: 0;
  pointer-events: none;
  transition: opacity 120ms ease;
}
.cluster-tooltip.is-visible { opacity: 1; pointer-events: auto; }
.cluster-tooltip-head { display: flex; align-items: center; gap: 0.5rem; margin-bottom: 0.4rem; }
.cluster-tooltip-dot { width: 10px; height: 10px; border-radius: 50%; border: 1px solid var(--ink); }
.cluster-tooltip-count {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.8rem;
  color: var(--muted);
}
.cluster-tooltip-kws { display: flex; flex-wrap: wrap; gap: 0.3rem 0.4rem; margin-bottom: 0.65rem; }
.cluster-tooltip-kw {
  font-size: 0.78rem;
  background: var(--panel);
  padding: 0.1rem 0.45rem;
}
.cluster-tooltip-reps-label {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 0.3rem;
}
.cluster-tooltip-reps { list-style: none; margin: 0; padding: 0; }
.cluster-tooltip-reps li { margin: 0.2rem 0; font-size: 0.85rem; line-height: 1.35; }

/* ---------- fig-domain-network interactivity ---------- */

#fig-where svg .where-edge,
#fig-where svg .where-tech,
#fig-where svg .where-domain,
#fig-where svg .where-label,
#fig-where svg .where-leader {
  transition: opacity 140ms ease, stroke-width 140ms ease, fill 140ms ease;
}
#fig-where svg.has-active .where-edge,
#fig-where svg.has-active .where-tech,
#fig-where svg.has-active .where-label,
#fig-where svg.has-active .where-leader,
#fig-where svg.has-active .where-domain { opacity: 0.2; }
#fig-where svg.has-active .where-edge.is-active,
#fig-where svg.has-active .where-tech.is-active,
#fig-where svg.has-active .where-label.is-active,
#fig-where svg.has-active .where-leader.is-active,
#fig-where svg.has-active .where-domain.is-active { opacity: 1; }

.where-detail { margin-top: 1rem; }
.where-detail-head {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 0.55rem;
}
.where-detail-list { margin: 0; padding-left: 1.2rem; }
.where-detail-list li { margin: 0.35rem 0; font-size: 0.92rem; line-height: 1.4; }
.where-detail-year { color: var(--muted); font-style: italic; }

/* ---------- pipeline hero ---------- */

#pipeline-hero { margin: 2.5rem 0 3rem; }

/* Pipeline figure: borderless mount. An animated wireframe mesh canvas sits
   behind the stack (see pipeline-mesh.js). */
#pipeline-figure { position: relative; min-height: 260px; padding: 1.25rem 0; }
.pipeline-mesh-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  z-index: 0;
  pointer-events: none;
}

.pipeline-stack {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
  width: 100%;
}

/* ---- requirement bands (above + below the strip) ---- */

.pipeline-band-wrap { display: flex; flex-direction: column; align-items: center; gap: 0.5rem; }
.pipeline-band-top    { order: 0; }
.pipeline-band-bottom { order: 2; }

.pipeline-band {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted);
  text-align: center;
}

.pipeline-reqs { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.6rem; }
/* Requirement toggles are chia .btn elements (class set in pipeline.js);
   only size down for the dense band. */
.btn.pipeline-req { font-size: 0.82rem; padding: 0.28rem 0.7rem; min-width: 5.5rem; }

/* ---- pipeline strip: one continuous horizontal bar ---- */

.pipeline-strip {
  order: 1;
  display: flex;
  width: 100%;
  border: 1.5px solid var(--ink);
  box-shadow: var(--shadow-sm);
  background: var(--white);
}
.pipeline-segment {
  flex: 1 1 0;
  min-width: 0;
  font-family: var(--font-heading);
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--ink);
  background: transparent;
  border: 0;
  padding: 1rem 0.75rem;
  cursor: pointer;
  text-align: center;
  transition: color 120ms ease, background 120ms ease;
}
.pipeline-segment + .pipeline-segment { border-left: 1.5px solid var(--ink); }
.pipeline-segment:hover { color: var(--blue); background: var(--panel); }
.pipeline-segment.is-active { color: var(--white); background: var(--blue); }

@media (max-width: 640px) {
  .pipeline-segment { font-size: 0.78rem; padding: 0.85rem 0.4rem; }
  .btn.pipeline-req { min-width: 0; }
}

#pipeline-detail h3 { margin-top: 0; }
#pipeline-detail .refs {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--rule);
  font-size: 0.88rem;
  color: var(--muted);
}
#pipeline-detail .refs ol { padding-left: 1.5rem; margin: 0.5rem 0 0; }
#pipeline-detail .refs li { margin: 0.25rem 0; }

sup.ref-marker a { font-family: var(--font-mono); font-size: 0.72rem; border-bottom: none; }

.chart-mount { min-height: 340px; display: flex; align-items: center; justify-content: center; }
.placeholder-text { color: var(--muted); }

/* ---------- recommendations ---------- */

.recs-list { margin: 0; padding-left: 1.5rem; }
.recs-list li { margin: 0.6rem 0; }

/* ---------- citation ---------- */

.bibtex-wrap { position: relative; }
.bibtex {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  overflow-x: auto;
  white-space: pre;
  margin: 0;
  line-height: 1.5;
  padding-right: 5.5rem;   /* room for the copy button */
}
.copy-btn { position: absolute; top: 0.75rem; right: 0.75rem; }
.copy-btn.is-copied { background: var(--blue); color: var(--white); }

/* ---------- discussion ---------- */

.giscus { width: 100%; }
.giscus-frame { width: 100%; border: 0; }

/* ---------- responsive ---------- */

@media (max-width: 640px) {
  h1 { font-size: 2.25rem; }
  h2 { font-size: 1.4rem; }
  .site-header .subtitle { font-size: 1.15rem; }
}