/* ---------- Reset / Base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  color: #1c1f24;
  background: #fafaf9;
  -webkit-font-smoothing: antialiased;
}

a { color: #1f5fb3; text-decoration: none; }
a:hover { text-decoration: underline; }

main { max-width: 960px; margin: 0 auto; padding: 0 1.25rem; }
section { margin: 3.5rem 0; }

h1, h2 { font-weight: 700; letter-spacing: -0.01em; }
h2 {
  font-size: 1.5rem;
  margin: 0 0 1rem 0;
  padding-bottom: .35rem;
  border-bottom: 1px solid #e6e4dd;
}

/* ---------- Header ---------- */
.page-header {
  text-align: center;
  padding: 4rem 1.25rem 2.5rem;
  background: linear-gradient(180deg, #f0f0eb 0%, #fafaf9 100%);
  border-bottom: 1px solid #e6e4dd;
}

.page-header h1 {
  font-size: 2.4rem;
  line-height: 1.15;
  margin: 0 0 1.25rem;
  color: #161a1f;
}
.page-header h1 .skin {
  color: #e59a86;                       /* fallback if the image fails to load */
  background-image: url("skin_texture.png");
  background-size: cover;
  background-position: center;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent; /* let the texture show through the glyphs */
}
.page-header .subtitle {
  font-weight: 500;
  font-size: 1.6rem;
  color: #444;
}

.authors, .affils {
  list-style: none;
  padding: 0;
  margin: .75rem auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: .25rem 1.25rem;
  max-width: 800px;
}
.authors { font-size: 1.05rem; }
.authors a { color: #1f5fb3; }
.authors a:hover { color: #16447f; text-decoration: underline; }
.authors sup { font-size: .7em; color: #888; margin-left: 1px; }

.affils {
  font-size: .85rem;
  color: #5a5a5a;
  gap: .15rem 1rem;
}
.affils sup { color: #888; margin-right: 2px; }

.corresponding {
  margin: .5rem auto 0;
  font-size: .85rem;
  color: #5a5a5a;
}

.venue {
  margin: 1.25rem 0 1.5rem;
  font-size: 1rem;
  color: #5a5a5a;
  letter-spacing: .02em;
}

/* ---------- Badges ---------- */
.badges {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: .5rem;
}
.badge {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .5rem 1rem;
  background: #161a1f;
  color: #fafaf9;
  border-radius: 999px;
  font-size: .95rem;
  font-weight: 500;
  text-decoration: none !important;
  transition: background .12s ease, transform .12s ease;
}
.badge:hover { background: #2a2f37; transform: translateY(-1px); }
.badge svg { width: 18px; height: 18px; fill: currentColor; }

/* ---------- Highlights ---------- */
#highlights { margin-top: 2.5rem; }
.highlight-grid {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}
.highlight-grid li {
  display: flex;
  flex-direction: column;
  gap: .4rem;
  padding: 1.1rem 1rem;
  background: #fff;
  border: 1px solid #e6e4dd;
  border-radius: 8px;
  text-align: center;
}
.hl-num {
  font-size: 1.7rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #1f5fb3;
  line-height: 1.1;
}
.hl-label { font-size: .82rem; color: #555; line-height: 1.4; }

/* ---------- Method ---------- */
.method-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}
.method-card {
  background: #fff;
  border: 1px solid #e6e4dd;
  border-radius: 8px;
  padding: 1.25rem 1.4rem;
}
.method-card h3 {
  margin: .5rem 0 .6rem;
  font-size: 1.15rem;
  font-weight: 600;
}
.method-card p { margin: 0; font-size: .92rem; color: #333; text-align: justify; }
.stage-tag {
  display: inline-block;
  padding: .15rem .6rem;
  background: #161a1f;
  color: #fafaf9;
  border-radius: 999px;
  font-size: .72rem;
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
}

/* ---------- Dataset ---------- */
#dataset p { text-align: justify; }

/* ---------- Interpretability figure ---------- */
.saliency-figure { margin: 1.25rem 0 0; }
.saliency-figure img {
  width: 100%;
  height: auto;
  border-radius: 6px;
  background: #fff;
  border: 1px solid #e6e4dd;
}

/* ---------- Data-collection trio ---------- */
#setup { margin-top: 2.5rem; }
.figure-trio {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}
.figure-trio figure { margin: 0; }
.figure-trio img {
  width: 100%;
  height: 200px;
  object-fit: contain;
  border-radius: 6px;
  background: #fff;
  border: 1px solid #e6e4dd;
}
.figure-trio figcaption {
  margin-top: .6rem;
  font-size: .82rem;
  text-align: left;
}

/* ---------- Pipeline figure ---------- */
#pipeline { margin: 0 0 1.5rem; }
#pipeline img {
  width: 100%;
  height: auto;
  border-radius: 6px;
  background: #fff;
  border: 1px solid #e6e4dd;
}
figcaption {
  margin-top: .85rem;
  font-size: .9rem;
  color: #555;
  text-align: justify;
  line-height: 1.5;
}

/* ---------- Abstract ---------- */
#abstract p { text-align: justify; }

/* ---------- Results table ---------- */
.caption-prose { font-size: .9rem; color: #555; text-align: justify; }
.math { font-style: italic; }

.results-table-wrap {
  overflow-x: auto;
  margin: 1.25rem 0;
  border-radius: 6px;
  border: 1px solid #e6e4dd;
}
table.results {
  width: 100%;
  border-collapse: collapse;
  font-size: .95rem;
}
table.results th, table.results td {
  padding: .55rem .8rem;
  text-align: right;
  border-bottom: 1px solid #ece9e0;
}
table.results th:first-child,
table.results td:first-child,
table.results th:nth-child(2),
table.results td:nth-child(2) {
  text-align: left;
}
table.results thead th {
  background: #f5f3ec;
  font-weight: 600;
  border-bottom: 2px solid #d9d6cc;
}
table.results thead tr:first-child th { border-bottom: 1px solid #d9d6cc; }
table.results tbody tr:hover { background: #fbfaf3; }
table.results tr.ours { background: #f5f9f3; }
table.results tr.ours:hover { background: #eef5eb; }
table.results tr.ref-row td {
  color: #777;
  font-style: italic;
  background: #f5f3ec;
}

.footnote {
  margin-top: .8rem;
  font-size: .88rem;
  color: #5a5a5a;
  text-align: justify;
}

/* ---------- BibTeX ---------- */
.bibtex {
  position: relative;
  background: #161a1f;
  color: #d3d7db;
  border-radius: 6px;
  padding: 1rem 1.25rem;
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: .85rem;
  line-height: 1.55;
  overflow-x: auto;
}
.bibtex pre {
  margin: 0;
  white-space: pre;
  font-family: inherit;
  color: inherit;
}
.copy-btn {
  position: absolute;
  top: .65rem;
  right: .65rem;
  padding: .3rem .7rem;
  background: #2a2f37;
  color: #d3d7db;
  border: 1px solid #3a3f47;
  border-radius: 4px;
  font-family: inherit;
  font-size: .8rem;
  cursor: pointer;
  transition: background .12s ease;
}
.copy-btn:hover { background: #3a3f47; }
.copy-btn.copied { background: #2d5b2d; color: #fff; border-color: #2d5b2d; }

/* ---------- Footer ---------- */
footer {
  margin-top: 4rem;
  padding: 1.5rem 1.25rem 2.5rem;
  text-align: center;
  font-size: .85rem;
  color: #888;
  border-top: 1px solid #e6e4dd;
  background: #f5f3ec;
}
footer a { color: #555; }

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
  body { font-size: 16px; }
  .page-header { padding: 2.5rem 1rem 1.75rem; }
  .page-header h1 { font-size: 1.85rem; }
  .page-header .subtitle { font-size: 1.25rem; }
  h2 { font-size: 1.3rem; }
  .authors, .affils { font-size: .9rem; gap: .15rem .8rem; }
  table.results { font-size: .85rem; }
  table.results th, table.results td { padding: .45rem .55rem; }
  section { margin: 2.5rem 0; }
  .highlight-grid { grid-template-columns: repeat(2, 1fr); }
  .method-grid { grid-template-columns: 1fr; }
  .figure-trio { grid-template-columns: 1fr; }
  .figure-trio img { height: auto; }
}