/* ============================================================
   Inference-Time Trustworthy Survey — companion page
   Academic-press typography. No marketing flourishes;
   investment goes into hierarchy, whitespace, and figure framing.
   ============================================================ */

:root {
  --fg:           #1c1c1e;
  --fg-soft:      #2c2c30;
  --fg-muted:     #565b66;
  --fg-faint:     #8b909a;
  --bg:           #ffffff;
  --bg-soft:      #fafbfc;
  --bg-soft-2:    #f4f5f8;
  --rule:         #d3d7df;
  --rule-soft:    #e8eaef;

  --accent:       #1859c2;       /* TrustLLM-style blue */
  --accent-hover: #0c3a87;
  --accent-soft:  #e9f0fb;
  --accent-bar:   #2a6fd0;

  --tier1:        #0e7c8a;       /* deep cyan */
  --tier2:        #6c4cc7;       /* deep lavender */
  --tier3:        #15803d;       /* deep green */

  --shadow-fig:   0 1px 3px rgba(20, 35, 70, 0.06),
                  0 6px 20px rgba(20, 35, 70, 0.07);

  --max-width:    920px;
  --max-text:     760px;

  --font-text:    "Source Sans Pro", "Open Sans", -apple-system,
                  BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --font-display: "Source Serif Pro", "Charter", "Iowan Old Style", Georgia,
                  Cambria, "Times New Roman", Times, serif;
  --font-mono:    "JetBrains Mono", "SFMono-Regular", "Menlo", "Consolas",
                  monospace;
}

* { box-sizing: border-box; }

html {
  font-size: 17px;
  scroll-behavior: smooth;
  scroll-padding-top: 1rem;        /* no sticky nav, just a small breathing-room */
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-text);
  font-size: 1rem;
  line-height: 1.72;
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.12s ease;
}
a:hover { color: var(--accent-hover); text-decoration: underline; }

p { margin: 1em 0; }

/* ============================================================
   HERO
   ============================================================ */
header.hero {
  position: relative;
  text-align: center;
  padding: 4.5rem 1.5rem 3.2rem;
  background: var(--bg);
  border-bottom: 1px solid var(--rule);
  overflow: hidden;
}
header.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, var(--rule-soft) 1px, transparent 1px);
  background-size: 22px 22px;
  pointer-events: none;
  opacity: 0.55;
  mask-image: radial-gradient(ellipse at center, #000 25%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse at center, #000 25%, transparent 78%);
}
header.hero > * { position: relative; }

header.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 3.7vw, 2.7rem);
  line-height: 1.2;
  margin: 0 auto;
  max-width: 880px;
  font-weight: 700;
  color: var(--fg);
  letter-spacing: -0.012em;
}
header.hero .subtitle {
  font-family: var(--font-display);
  margin-top: 0.7rem;
  font-size: 1.1rem;
  font-style: italic;
  color: var(--fg-muted);
  max-width: 660px;
  margin-inline: auto;
}

.authors {
  margin: 2.1rem auto 0.4rem;
  max-width: 820px;
  font-size: 0.98rem;
  line-height: 1.85;
  color: var(--fg);
}
.authors sup { color: var(--fg-faint); font-size: 0.7em; }
.affiliations {
  font-size: 0.86rem;
  color: var(--fg-muted);
  max-width: 820px;
  margin: 0.45rem auto 0;
  line-height: 1.6;
}
.affiliations sup { color: var(--fg); font-weight: 600; }
.contrib-key {
  margin-top: 0.4rem;
  font-size: 0.82rem;
  color: var(--fg-faint);
}

/* ----- Nerfies-style hero buttons (pill, dark) ----- */
.publication-links {
  margin-top: 1.8rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  justify-content: center;
}
.publication-links .link-block { display: inline-block; }

.btn.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 1.2rem;
  font-size: 0.92rem;
  font-weight: 500;
  border-radius: 999px;
  background: #2a2a2e;
  color: #fff;
  border: 1px solid #2a2a2e;
  text-decoration: none;
  transition: background 0.14s, transform 0.12s;
}
.btn.pill:hover {
  background: #0a0a0c;
  color: #fff;
  text-decoration: none;
  transform: translateY(-1px);
}
.btn.pill .icon { font-size: 1em; }
.btn.pill.disabled {
  background: #c4c7cf;
  border-color: #c4c7cf;
  color: #f4f5f8;
  cursor: not-allowed;
  pointer-events: none;
}

/* ----- in-body buttons (Repository CTA) ----- */
.btn:not(.pill) {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.5rem 1.1rem;
  font-size: 0.93rem;
  font-weight: 500;
  border: 1px solid var(--rule);
  border-radius: 4px;
  background: #fff;
  color: var(--fg);
  text-decoration: none;
  transition: all 0.12s;
}
.btn:not(.pill):hover {
  border-color: var(--accent);
  color: var(--accent);
  text-decoration: none;
}
.btn:not(.pill).primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn:not(.pill).primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  color: #fff;
}

/* ============================================================
   BODY content (numbered sections, generous whitespace)
   ============================================================ */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.5rem 3.5rem;
  counter-reset: section;
}

/* Generic body section spacing */
main section {
  margin-top: 3.4rem;
  scroll-margin-top: 1rem;
}
main section:first-child { margin-top: 1.6rem; }

/* H2 — auto-numbered, with thin accent bar */
main h2 {
  counter-increment: section;
  font-family: var(--font-display);
  font-size: clamp(1.45rem, 2.2vw, 1.7rem);
  font-weight: 700;
  color: var(--fg);
  margin: 0 0 0.2rem;
  letter-spacing: -0.005em;
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
}
main h2::before {
  content: counter(section, decimal) ".";
  font-family: var(--font-display);
  font-weight: 400;
  font-style: italic;
  color: var(--fg-faint);
  font-size: 0.8em;
  letter-spacing: 0;
}
/* ornament: thin double-line under H2 */
main h2 + .rule {
  margin: 0.45rem 0 1.4rem;
  height: 4px;
  border: 0;
  background:
    linear-gradient(to bottom,
      var(--rule) 0,    var(--rule) 1px,
      transparent 1px,  transparent 3px,
      var(--rule-soft) 3px, var(--rule-soft) 4px);
  position: relative;
}
main h2 + .rule::before {
  content: "";
  position: absolute;
  left: 0; top: 0;
  width: 56px; height: 1px;
  background: var(--accent-bar);
}

/* H3 — for sub-categories within tier sections */
main h3 {
  font-family: var(--font-display);
  font-size: 1.18rem;
  font-weight: 600;
  color: var(--fg);
  margin: 1.9rem 0 0.4rem;
  position: relative;
  padding-left: 0.7rem;
}
main h3::before {
  content: "";
  position: absolute;
  left: 0; top: 0.45em;
  height: 0.7em;
  width: 3px;
  background: var(--accent);
  border-radius: 2px;
}

main p {
  font-size: 1.02rem;
  line-height: 1.78;
  color: var(--fg-soft);
  margin: 0.95rem 0;
  max-width: var(--max-text);
}

main p strong { color: var(--fg); font-weight: 600; }

main section > p:first-of-type::first-letter {
  /* small drop-cap for the lead paragraph of each section */
}

main ul, main ol {
  padding-left: 1.5rem;
  line-height: 1.78;
  max-width: var(--max-text);
}
main ul li, main ol li {
  margin: 0.6rem 0;
  color: var(--fg-soft);
}
main ol {
  counter-reset: numbered;
  list-style: none;
  padding-left: 0;
}
main ol > li {
  counter-increment: numbered;
  position: relative;
  padding-left: 2.6rem;
  margin: 0.95rem 0;
}
main ol > li::before {
  content: counter(numbered, decimal-leading-zero);
  position: absolute;
  left: 0; top: 0.05em;
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 400;
  font-size: 1.15rem;
  color: var(--accent);
  letter-spacing: 0;
}

/* ============================================================
   Tier H2 markers — small colored dot before number
   ============================================================ */
main h2.tier { padding-left: 0; }
main h2.tier::after {
  content: "";
  display: inline-block;
  width: 9px; height: 9px;
  border-radius: 50%;
  margin-left: 0.5rem;
  vertical-align: middle;
  background: var(--accent);
}
main h2.tier.t1::after { background: var(--tier1); box-shadow: 0 0 0 3px rgba(14,124,138,0.12); }
main h2.tier.t2::after { background: var(--tier2); box-shadow: 0 0 0 3px rgba(108,76,199,0.12); }
main h2.tier.t3::after { background: var(--tier3); box-shadow: 0 0 0 3px rgba(21,128,61,0.12); }

/* ============================================================
   FIGURE — academic press style
   ============================================================ */
figure {
  margin: 2rem auto 1.7rem;
  text-align: center;
  max-width: 100%;
}
figure .frame {
  display: inline-block;
  padding: 8px;
  background: #fff;
  border: 1px solid var(--rule);
  border-radius: 4px;
  box-shadow: var(--shadow-fig);
  max-width: 100%;
}
figure .frame img {
  max-width: 100%;
  height: auto;
  display: block;
}
figure figcaption {
  font-family: var(--font-display);
  font-size: 0.92rem;
  color: var(--fg-muted);
  text-align: justify;
  max-width: 720px;
  margin: 1rem auto 0;
  line-height: 1.6;
  position: relative;
  padding-left: 0;
}
figure figcaption .fig-label {
  font-weight: 700;
  font-style: normal;
  color: var(--fg);
}
figure figcaption b { color: var(--fg); }

/* ============================================================
   COMPARISON TABLE — refined
   ============================================================ */
.table-wrap {
  overflow-x: auto;
  margin: 1.4rem 0 0.4rem;
  border: 1px solid var(--rule);
  border-radius: 4px;
  background: #fff;
}
table.comparison {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.86rem;
  font-family: var(--font-text);
}
table.comparison th,
table.comparison td {
  padding: 0.55rem 0.7rem;
  text-align: center;
  border-bottom: 1px solid var(--rule-soft);
  white-space: nowrap;
}
table.comparison thead th {
  background: var(--bg-soft-2);
  color: var(--fg);
  font-weight: 600;
  font-size: 0.82rem;
  border-bottom: 2px solid var(--rule);
}
table.comparison thead th.group {
  background: var(--accent-soft);
  color: var(--accent-hover);
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: 0.01em;
}
table.comparison td.row-name {
  text-align: left;
  font-weight: 500;
  color: var(--fg);
  background: var(--bg-soft);
  white-space: normal;
  min-width: 220px;
  font-size: 0.86rem;
}
table.comparison tbody tr:nth-child(odd):not(.ours) td:not(.row-name) {
  background: var(--bg-soft);
}
table.comparison tbody tr.ours td {
  font-weight: 700;
  background: #fffaeb;
}
table.comparison tbody tr.ours td.row-name {
  color: var(--accent-hover);
  background: #fff4d4;
  border-left: 2px solid var(--accent);
}
table.comparison .yes { color: #15803d; font-weight: 700; }
table.comparison .no  { color: #b91c1c; font-weight: 400; opacity: 0.65; }

/* ============================================================
   BIBTEX — academic monospace
   ============================================================ */
pre.bibtex {
  background: #f6f7f9;
  border: 1px solid var(--rule);
  border-left: 3px solid var(--accent);
  border-radius: 0 4px 4px 0;
  padding: 1.05rem 1.2rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--fg);
  overflow-x: auto;
  white-space: pre;
  margin: 1rem 0 0.5rem;
  max-width: var(--max-text);
}

/* ============================================================
   BIBTEX wrap with copy button
   ============================================================ */
.bibtex-wrap {
  position: relative;
  max-width: var(--max-text);
}
.copy-btn {
  position: absolute;
  top: 0.55rem;
  right: 0.6rem;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.28rem 0.62rem;
  font-family: var(--font-text);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--fg-muted);
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--rule);
  border-radius: 4px;
  cursor: pointer;
  transition: color 0.12s, border-color 0.12s, background 0.12s;
  z-index: 2;
  user-select: none;
}
.copy-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: #fff;
}
.copy-btn.copied {
  color: #15803d;
  border-color: #15803d;
}
.copy-btn i { font-size: 0.92em; }

/* ============================================================
   FOOTER
   ============================================================ */
footer {
  margin-top: 4rem;
  padding: 2.2rem 1.5rem;
  border-top: 1px solid var(--rule);
  text-align: center;
  font-family: var(--font-display);
  font-size: 0.88rem;
  font-style: italic;
  color: var(--fg-muted);
  background: var(--bg-soft);
}
footer p { margin: 0.3rem 0; }
footer a { color: var(--fg-muted); }

/* ============================================================
   PULL-QUOTE  (one-sentence highlight per Tier section)
   ============================================================ */
blockquote.pullquote {
  margin: 1.6rem 0 1.4rem;
  padding: 0.85rem 1.3rem 0.85rem 1.5rem;
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-style: italic;
  font-weight: 400;
  line-height: 1.55;
  color: var(--fg);
  background: linear-gradient(to right, var(--bg-soft) 0%, transparent 100%);
  border-left: 4px solid var(--accent);
  border-radius: 0 4px 4px 0;
  max-width: var(--max-text);
  position: relative;
}
blockquote.pullquote::before {
  content: "\201C";       /* fancy left double-quote */
  position: absolute;
  left: 0.4rem;
  top: 0.1em;
  font-family: var(--font-display);
  font-size: 2.6rem;
  line-height: 1;
  color: var(--rule);
  font-style: normal;
  pointer-events: none;
}
blockquote.pullquote.t1 { border-left-color: var(--tier1); }
blockquote.pullquote.t2 { border-left-color: var(--tier2); }
blockquote.pullquote.t3 { border-left-color: var(--tier3); }
blockquote.pullquote.t1::before { color: rgba(14,124,138, 0.18); }
blockquote.pullquote.t2::before { color: rgba(108,76,199, 0.18); }
blockquote.pullquote.t3::before { color: rgba(21,128,61,  0.18); }

/* ============================================================
   PAGE LAYOUT  (main + sticky TOC sidebar)
   ============================================================ */
.page-layout {
  display: block;          /* default: stacked, no TOC */
}
.toc-side {
  display: none;           /* mobile default */
}

@media (min-width: 1180px) {
  .page-layout {
    display: grid;
    grid-template-columns: minmax(0, var(--max-width)) 188px;
    gap: 2.4rem;
    max-width: calc(var(--max-width) + 188px + 2.4rem);
    margin: 0 auto;
    padding: 0 1.5rem;
    align-items: start;
  }
}

/* Very wide screens: more generous main + a touch wider TOC */
@media (min-width: 1500px) {
  :root { --max-width: 980px; }
  .page-layout {
    grid-template-columns: minmax(0, var(--max-width)) 220px;
    gap: 3rem;
    max-width: calc(var(--max-width) + 220px + 3rem);
  }
  .toc-side { font-size: 0.86rem; }
  /* keep text column readable — figures can fill the wider main */
  main p, main ul, main ol { max-width: 800px; }
  figure figcaption { max-width: 800px; }
}

@media (min-width: 1180px) {
  /* duplicate marker block — consolidate close braces below */
  .page-layout > main { padding-left: 0; padding-right: 0; }
  .toc-side {
    display: block;
    position: sticky;
    top: 1.5rem;
    max-height: calc(100vh - 3rem);
    overflow-y: auto;
    font-size: 0.83rem;
    line-height: 1.55;
    padding: 1.6rem 0 1rem 1rem;
    border-left: 1px solid var(--rule-soft);
  }
  .toc-side .toc-title {
    font-family: var(--font-text);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--fg-faint);
    margin-bottom: 0.7rem;
  }
  .toc-side ol {
    list-style: none;
    counter-reset: toc;
    padding: 0;
    margin: 0;
  }
  .toc-side ol li {
    counter-increment: toc;
    margin: 0.05rem 0;
  }
  .toc-side ol li a {
    display: block;
    padding: 0.28rem 0.55rem 0.28rem 0;
    color: var(--fg-muted);
    text-decoration: none;
    border-left: 2px solid transparent;
    margin-left: -1rem;
    padding-left: 0.85rem;
    transition: color 0.12s, border-color 0.12s;
    position: relative;
  }
  .toc-side ol li a::before {
    content: counter(toc, decimal-leading-zero) "  ";
    color: var(--fg-faint);
    font-family: var(--font-display);
    font-style: italic;
    margin-right: 0.4em;
  }
  .toc-side ol li a:hover {
    color: var(--accent);
    text-decoration: none;
  }
  .toc-side ol li a.active {
    color: var(--accent);
    border-left-color: var(--accent);
    font-weight: 600;
  }
  .toc-side ol li a.active::before { color: var(--accent); }
}

/* ============================================================
   BACK-TO-TOP FAB
   ============================================================ */
.back-top {
  position: fixed;
  right: 1.4rem;
  bottom: 1.4rem;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.96);
  border: 1px solid var(--rule);
  box-shadow: 0 4px 14px rgba(20, 35, 70, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--fg-muted);
  text-decoration: none;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity 0.2s ease, transform 0.2s ease, color 0.12s;
  z-index: 60;
}
.back-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}
.back-top:hover {
  color: var(--accent);
  border-color: var(--accent);
  text-decoration: none;
}
.back-top svg {
  width: 16px;
  height: 16px;
}

/* ============================================================
   SECTION HEADING ANCHOR (hover # link)
   ============================================================ */
main h2 {
  position: relative;
}
main h2 .anchor-link {
  opacity: 0;
  margin-left: 0.4rem;
  font-weight: 400;
  color: var(--fg-faint);
  text-decoration: none;
  font-size: 0.9em;
  transition: opacity 0.15s ease, color 0.15s ease;
}
main h2:hover .anchor-link {
  opacity: 1;
}
main h2 .anchor-link:hover {
  color: var(--accent);
  text-decoration: none;
}

/* ============================================================
   NEWS list (richer)
   ============================================================ */
.news-list {
  list-style: none;
  padding: 0;
  margin: 0.6rem 0 0;
  max-width: var(--max-text);
}
.news-list li {
  display: flex;
  gap: 0.95rem;
  align-items: baseline;
  padding: 0.55rem 0;
  border-bottom: 1px dotted var(--rule);
  font-size: 0.97rem;
}
.news-list li:last-child { border-bottom: none; }
.news-list .date {
  flex-shrink: 0;
  font-family: var(--font-display);
  font-style: italic;
  font-size: 0.86rem;
  color: var(--accent);
  min-width: 4.5em;
  font-variant-numeric: tabular-nums;
}
.news-list .date.upcoming {
  color: var(--fg-faint);
}
.news-list .badge {
  display: inline-block;
  margin-left: 0.4em;
  padding: 0.05em 0.45em;
  font-family: var(--font-text);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--fg-muted);
  background: var(--bg-soft-2);
  border-radius: 3px;
  vertical-align: middle;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 720px) {
  html { font-size: 16px; }
  header.hero { padding: 2.6rem 1rem 2rem; }
  header.hero h1 { font-size: 1.55rem; }
  header.hero .subtitle { font-size: 0.98rem; }
  main { padding: 1.4rem 1rem 2.2rem; }
  main section { margin-top: 2.4rem; }
  main h2 { font-size: 1.32rem; gap: 0.5rem; }
  main h3 { font-size: 1.05rem; }
  main p { font-size: 1rem; }
  main ol > li { padding-left: 2rem; }
  figure .frame { padding: 4px; }
}

/* ============================================================
   PRINT STYLESHEET  (for reviewers / readers who print the page)
   ============================================================ */
@media print {
  /* hide chrome that doesn't make sense on paper */
  .nav,
  .toc-side,
  .back-top,
  .copy-btn,
  .publication-links,
  header.hero::before {
    display: none !important;
  }
  /* simplify layout */
  body {
    color: #000;
    background: #fff;
    font-size: 11pt;
    line-height: 1.5;
  }
  .page-layout {
    display: block !important;
    grid-template-columns: none !important;
    max-width: 100% !important;
    padding: 0 !important;
  }
  main {
    padding: 0 !important;
    max-width: 100% !important;
  }
  header.hero {
    padding: 1rem 0 0.7rem !important;
    border-bottom: 1px solid #999;
    page-break-after: avoid;
  }
  header.hero h1 { font-size: 18pt; }
  header.hero .subtitle { font-size: 11pt; }
  /* avoid bad page breaks */
  h2, h3, figure { page-break-inside: avoid; page-break-after: avoid; }
  figure img { box-shadow: none !important; }
  figure .frame { box-shadow: none !important; padding: 0 !important; border: 1px solid #999 !important; }
  blockquote.pullquote { background: none !important; }
  /* show URL after links so printed page is self-contained */
  main a[href^="http"]::after,
  main a[href^="mailto:"]::after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
    font-family: var(--font-mono);
    color: #555;
    word-break: break-all;
  }
  /* keep BibTeX readable */
  pre.bibtex {
    background: #f3f3f3 !important;
    border: 1px solid #999 !important;
    page-break-inside: avoid;
  }
  /* table on print */
  table.comparison thead th { background: #eee !important; color: #000 !important; }
  table.comparison tbody tr.ours td { background: #f5f5f5 !important; }
  /* hide the copy icon if the FA stylesheet isn't loaded for print */
  .copy-btn { display: none !important; }
}