:root {
  --bg:        #ffffff;
  --bg-elev:   #f7f7f6;
  --card:      #fbfbfa;
  --text:      #111316;
  --muted:     #5b6168;
  --faint:     #8a9099;
  --border:    #e4e4e1;
  --border-strong: #cfcfca;
  --link:      #1d4ed8;
  --link-hover:#0b2a99;
  --accent:    #b8541c;
  --code-bg:   #f4f4f1;
  --checker-a: #f3f3f0;
  --checker-b: #e4e4e0;

  --font-sans:  'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-serif: 'Source Serif 4', Georgia, 'Times New Roman', serif;
  --font-mono:  'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --radius: 10px;
  --radius-sm: 6px;
  --shadow-card: 0 1px 2px rgba(15,17,20,.04), 0 4px 14px rgba(15,17,20,.04);
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-serif);
  font-size: 17px;
  line-height: 1.65;
  letter-spacing: 0.003em;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--link);
  text-decoration: none;
  border-bottom: 1px solid rgba(29,78,216,.25);
  transition: color .15s, border-color .15s;
}
a:hover { color: var(--link-hover); border-bottom-color: var(--link-hover); }

h1, h2, h3 {
  font-family: var(--font-sans);
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.012em;
}

h2 {
  font-size: 1.55rem;
  margin: 0 0 1.2rem;
  padding-bottom: .55rem;
  border-bottom: 1px solid var(--border);
}

h3 {
  font-size: 1.05rem;
  margin: 0 0 .5rem;
}

.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 28px;
}
.container.narrow { max-width: 820px; }

/* ─── Hero ─────────────────────────────────────────────────── */
.hero {
  padding: 72px 0 36px;
  text-align: center;
  background:
    radial-gradient(60% 70% at 50% 0%, #f4f6f9 0%, transparent 70%),
    var(--bg);
  border-bottom: 1px solid var(--border);
}

.venue {
  font-family: var(--font-sans);
  font-size: .8rem;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 1.1rem;
}

.title {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: clamp(1.6rem, 1.05rem + 1.8vw, 2.55rem);
  line-height: 1.18;
  margin: 0 auto 1.4rem;
  max-width: 22ch;
  letter-spacing: -0.018em;
}
.title .method { color: var(--accent); }

.authors {
  list-style: none;
  padding: 0;
  margin: 0 0 .35rem;
  font-family: var(--font-sans);
  font-size: 1rem;
  color: var(--text);
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: .25rem 1.1rem;
}
.authors li { white-space: nowrap; }

.affiliation {
  margin: 0 0 1.6rem;
  font-family: var(--font-sans);
  color: var(--muted);
  font-size: .95rem;
}

.links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: .55rem;
  margin-top: .4rem;
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  padding: .55rem 1rem;
  background: var(--text);
  color: #fff;
  border: 1px solid var(--text);
  border-radius: 999px;
  font-family: var(--font-sans);
  font-size: .9rem;
  font-weight: 500;
  text-decoration: none;
  border-bottom: 1px solid var(--text);
  transition: background .15s, color .15s, transform .1s;
}
.pill:hover {
  background: #fff;
  color: var(--text);
  border-bottom-color: var(--text);
  transform: translateY(-1px);
}
.pill[aria-disabled="true"] {
  background: #fff;
  color: var(--faint);
  border-color: var(--border-strong);
  cursor: not-allowed;
  pointer-events: none;
}
.pill .ico {
  font-family: var(--font-mono);
  font-size: .75rem;
  padding: .12rem .42rem;
  border-radius: 4px;
  background: rgba(255,255,255,.15);
  letter-spacing: .02em;
}
.pill[aria-disabled="true"] .ico { background: var(--bg-elev); }
.pill:hover .ico { background: rgba(0,0,0,.07); }

/* ─── Section spacing ──────────────────────────────────────── */
section { padding: 56px 0; }
section + section { border-top: 1px solid var(--border); }

/* ─── Teaser ───────────────────────────────────────────────── */
.teaser figure {
  margin: 0;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow-card);
}
.teaser img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
}
.teaser figcaption,
.viewer-cell figcaption {
  margin-top: 12px;
  font-family: var(--font-sans);
  font-size: .85rem;
  color: var(--muted);
  text-align: center;
  line-height: 1.5;
}

/* ─── Abstract ─────────────────────────────────────────────── */
.abstract p {
  margin: 0 0 1rem;
  text-align: justify;
  hyphens: auto;
}

/* ─── Method pipeline figure ───────────────────────────────── */
.pipeline-figure {
  margin: 0;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 24px 18px;
  box-shadow: var(--shadow-card);
}
.pipeline-figure img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
}
.pipeline-figure figcaption {
  margin-top: 14px;
  font-family: var(--font-sans);
  font-size: .9rem;
  color: var(--muted);
  text-align: center;
  line-height: 1.55;
}
.pipeline-figure figcaption strong { color: var(--text); font-weight: 600; }

.mono { font-family: var(--font-mono); font-size: .92em; }

/* ─── Results / charts ─────────────────────────────────────── */
.results .lede {
  max-width: 760px;
  color: var(--muted);
  font-size: .98rem;
  margin: 0 0 1.8rem;
}

.chart-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.chart-card {
  margin: 0;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 18px 16px;
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
}
.chart-card figcaption {
  font-family: var(--font-sans);
  font-size: .92rem;
  color: var(--text);
  margin-bottom: 10px;
}
.chart-card figcaption .muted {
  color: var(--muted);
  font-weight: 400;
  font-size: .85rem;
}
.chart-wrap {
  position: relative;
  height: 280px;
}

@media (max-width: 920px) {
  .chart-row { grid-template-columns: 1fr; }
  .chart-wrap { height: 260px; }
}

/* ─── Qualitative comparison figure ────────────────────────── */
.qualitative .lede {
  max-width: 760px;
  color: var(--muted);
  font-size: .98rem;
  margin: 0 0 1.8rem;
}
.qualitative-figure {
  margin: 0;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 22px 18px;
  box-shadow: var(--shadow-card);
}
.qualitative-figure img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
}
.qualitative-figure figcaption {
  margin-top: 14px;
  font-family: var(--font-sans);
  font-size: .9rem;
  color: var(--muted);
  text-align: center;
  line-height: 1.55;
}
.qualitative-figure figcaption strong { color: var(--text); font-weight: 600; }

/* ─── Gallery ──────────────────────────────────────────────── */
.gallery .lede {
  max-width: 720px;
  color: var(--muted);
  font-size: .98rem;
  margin: 0 0 1.6rem;
}

.sample-strip {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(96px, 1fr));
  gap: 10px;
  margin-bottom: 28px;
  padding-bottom: 6px;
}

.sample-thumb {
  position: relative;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  cursor: pointer;
  background: var(--bg-elev);
  aspect-ratio: 1 / 1;
  padding: 0;
  transition: border-color .15s, transform .12s, box-shadow .15s;
}
.sample-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.sample-thumb:hover {
  border-color: var(--text);
  transform: translateY(-1px);
}
.sample-thumb.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(184,84,28,.18);
}

.viewer {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.viewer-row {
  display: grid;
  gap: 18px;
}

.viewer-row:first-child {
  grid-template-columns: 1fr 1fr;
}

.layers-row {
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.viewer-cell {
  margin: 0;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  box-shadow: var(--shadow-card);
}

.checker {
  position: relative;
  aspect-ratio: 1 / 1;
  border-radius: var(--radius-sm);
  overflow: hidden;
  background-color: var(--checker-a);
  background-image:
    linear-gradient(45deg, var(--checker-b) 25%, transparent 25%),
    linear-gradient(-45deg, var(--checker-b) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, var(--checker-b) 75%),
    linear-gradient(-45deg, transparent 75%, var(--checker-b) 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0px;
}
.checker img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

/* ─── BibTeX ───────────────────────────────────────────────── */
.bibtex pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 18px 20px;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: .82rem;
  line-height: 1.55;
  color: var(--text);
  margin: 0;
}

/* ─── Footer ───────────────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--border);
  padding: 28px 0 40px;
  font-family: var(--font-sans);
  font-size: .85rem;
  color: var(--muted);
  text-align: center;
}
.footer a { color: var(--muted); border-bottom-color: var(--border-strong); }
.footer a:hover { color: var(--text); border-bottom-color: var(--text); }

/* ─── Smaller screens ──────────────────────────────────────── */
@media (max-width: 620px) {
  body { font-size: 16px; }
  .hero { padding: 48px 0 28px; }
  .viewer-row:first-child { grid-template-columns: 1fr; }
  .layers-row { grid-template-columns: repeat(2, 1fr); }
  section { padding: 44px 0; }
}