:root {
  --bg: #f2efe8;
  --bg-alt: #e8e3d8;
  --ink: #2a2826;
  --ink-soft: #6b6860;
  --border: #d0cbc0;
  --accent: #b8571e;
  --accent-ink: #ffffff;
  --card-bg: #f2efe8;
  --code-bg: #e8e3d8;
  --code-ink: #2a2826;
  --shadow: 0 1px 2px rgba(20, 18, 12, 0.06), 0 8px 24px rgba(20, 18, 12, 0.05);
  --radius: 14px;
  --max-width: 1080px;
}





:root[data-theme="light"] {
  --bg: #ffffff;
  --bg-alt: #f5f4f1;
  --ink: #1c1c1a;
  --ink-soft: #55534c;
  --border: #e2e0d8;
  --accent: #b8571e;
  --accent-ink: #ffffff;
  --card-bg: #ffffff;
  --code-bg: #211f1b;
  --code-ink: #f2ede2;
  --shadow: 0 1px 2px rgba(20, 18, 12, 0.06), 0 8px 24px rgba(20, 18, 12, 0.05);
}

* { box-sizing: border-box; }

html { color-scheme: light; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

h1, h2 {
  font-family: Georgia, "Times New Roman", serif;
  line-height: 1.15;
  margin: 0 0 0.4em;
}

a { color: inherit; }

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

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem clamp(1rem, 4vw, 2.5rem);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  z-index: 10;
}

.wordmark {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-family: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-weight: 700;
  font-size: clamp(1.05rem, 3vw, 1.3rem);
  text-decoration: none;
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.wordmark-logo { height: clamp(16px, 3vw, 20px); width: auto; }

.site-header nav { display: flex; gap: clamp(0.9rem, 2vw, 1.6rem); }
.site-header nav a { text-decoration: none; color: var(--ink-soft); font-size: 0.95rem; }
.site-header nav a:hover { color: var(--accent); }

main { max-width: var(--max-width); margin: 0 auto; padding: clamp(2rem, 5vw, 3rem) clamp(1rem, 4vw, 2.5rem) 0; }

.hero {
  position: relative;
  min-height: clamp(460px, 62vw, 680px);
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  isolation: isolate;
}

.hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 60% 68%;
  z-index: -2;
}

.hero-scrim {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(100deg, rgba(255, 255, 255, 0.75) 0%, rgba(255, 255, 255, 0.6) 34%, rgba(255, 255, 255, 0.3) 62%, rgba(255, 255, 255, 0.1) 85%),
    linear-gradient(0deg, rgba(255, 255, 255, 0.65) 0%, rgba(255, 255, 255, 0.1) 45%);
}

.hero-inner {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: clamp(6rem, 16vw, 8rem) clamp(1rem, 4vw, 2.5rem) clamp(2.6rem, 5vw, 3.6rem);
  color: #1c1c1a;
}


.hero-inner h1 {
  font-family: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: clamp(2.6rem, 6vw, 4.4rem);
  color: #1c1c1a;
  text-wrap: balance;
  text-shadow: 0 2px 18px rgba(255, 255, 255, 0.6);
}

.tagline {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: rgba(28, 28, 26, 0.92);
  margin: 0 0 1.4rem;
  text-shadow: 0 1px 10px rgba(255, 255, 255, 0.5);
}

.authors { margin: 0 0 0.3rem; font-size: 0.98rem; color: rgba(28, 28, 26, 0.97); text-shadow: 0 1px 8px rgba(255, 255, 255, 0.4); }
.affiliations { margin: 0 0 0.2rem; color: rgba(28, 28, 26, 0.8); font-size: 0.92rem; text-shadow: 0 1px 8px rgba(255, 255, 255, 0.4); }
.footnote { margin: 0 0 1.4rem; color: rgba(28, 28, 26, 0.65); font-size: 0.8rem; text-shadow: 0 1px 8px rgba(255, 255, 255, 0.4); }

.cta-row { display: flex; flex-wrap: wrap; gap: 0.7rem; }

.btn {
  display: inline-block;
  padding: 0.6rem 1.25rem;
  border-radius: 999px;
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 600;
  border: 1px solid var(--border);
  transition: transform 0.15s ease, background 0.15s ease;
}
.btn:hover { transform: translateY(-1px); }

.btn-primary {
  background: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
}




.btn-secondary {
  background: transparent;
  color: var(--ink);
}
.btn-secondary:hover { border-color: var(--accent); color: var(--accent); }

.hero .cta-row .btn-primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.hero .cta-row .btn-secondary { background: rgba(28, 28, 26, 0.08); color: #1c1c1a; border-color: rgba(28, 28, 26, 0.3); }
.hero .cta-row .btn-secondary:hover { background: rgba(28, 28, 26, 0.15); border-color: #1c1c1a; color: #1c1c1a; }

.partners { background: var(--bg-alt); border-top: 1px solid var(--border); padding: clamp(2rem, 5vw, 3rem) 0; }

.partners-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 clamp(1rem, 4vw, 2.5rem);
  text-align: center;
}

.partners-divider {
  width: 140px;
  margin: clamp(1.6rem, 4vw, 2.4rem) auto;
  border: none;
  border-top: 1px solid var(--border);
}

.partners-label {
  display: block;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--ink-soft);
  margin-bottom: 1.3rem;
}

.logo-wall {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: clamp(0.8rem, 2.5vw, 1.2rem);
}

.logo-wall li {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 58px;
  padding: 0 1.3rem;
  background: #f2efe8;
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: var(--shadow);
}

.logo-wall img {
  max-height: 26px;
  max-width: 130px;
  width: auto;
  height: auto;
  object-fit: contain;
}

.logo-placeholder {
  font-size: 0.85rem;
  font-weight: 600;
  color: #55534c;
  white-space: nowrap;
}

.stats-bar {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: clamp(2.5rem, 6vw, 4rem);
}

.stat-tile {
  background: var(--bg-alt);
  padding: 1.3rem 1rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.stat-value { font-size: 1.5rem; font-weight: 700; font-family: Georgia, serif; }
.stat-label { font-size: 0.8rem; color: var(--ink-soft); text-transform: uppercase; letter-spacing: 0.04em; }
.stat-sub, .stat-updated { font-size: 0.72rem; color: var(--ink-soft); }

.ibm-feature {
  display: flex;
  justify-content: center;
  padding: clamp(2rem, 5vw, 3rem) 0;
  border-top: 1px solid var(--border);
}

.ibm-feature img { height: clamp(56px, 9vw, 92px); width: auto; }

.prose-section { padding: clamp(1.5rem, 4vw, 2.5rem) 0; border-top: 1px solid var(--border); }
.prose-section h2 { font-size: clamp(1.4rem, 3vw, 1.8rem); }
.prose-section p { color: var(--ink-soft); max-width: 68ch; }

.abstract-body {
  position: relative;
  max-height: 7.9em;
  overflow: hidden;
}

.abstract-body::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3.2em;
  background: linear-gradient(to bottom, transparent, var(--bg));
}

.abstract-body.expanded {
  max-height: none;
}

.abstract-body.expanded::after {
  display: none;
}

.read-more-btn {
  display: inline-block;
  margin-top: 0.9rem;
  padding: 0;
  background: none;
  border: none;
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
}
.read-more-btn:hover { text-decoration: underline; }

.fact-list { margin: 0; padding-left: 1.2rem; color: var(--ink-soft); }
.fact-list li { margin-bottom: 0.4rem; }
.fact-list a { color: var(--accent); }

.gallery-section { padding: clamp(1.5rem, 4vw, 2.5rem) 0; border-top: 1px solid var(--border); }
.gallery-section h2 { font-size: clamp(1.4rem, 3vw, 1.8rem); }
.section-intro { color: var(--ink-soft); max-width: 68ch; margin-top: 0; }

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.1rem;
  margin-top: 1.2rem;
}

@media (max-width: 760px) {
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 460px) {
  .gallery-grid { grid-template-columns: 1fr; }
}

.gallery-card {
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-top: 4px solid var(--accent, var(--border));
  box-shadow: var(--shadow);
}

.gallery-card img { aspect-ratio: 1 / 1; object-fit: cover; }

.gallery-card figcaption { padding: 0.8rem 0.9rem 1rem; }
.gallery-card figcaption strong { display: block; margin-bottom: 0.2rem; }
.gallery-card figcaption span { font-size: 0.85rem; color: var(--ink-soft); }

#bibtex-block {
  background: var(--code-bg);
  color: var(--code-ink);
  padding: 1.1rem 1.2rem;
  border-radius: var(--radius);
  overflow-x: auto;
  font-size: 0.82rem;
  line-height: 1.6;
}

.site-footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: clamp(2rem, 4vw, 3rem) clamp(1rem, 4vw, 2.5rem) clamp(2.5rem, 5vw, 3.5rem);
  border-top: 1px solid var(--border);
  color: var(--ink-soft);
  font-size: 0.85rem;
}
.site-footer a { text-decoration: none; }
.site-footer a:hover { color: var(--accent); }
.site-footer p { margin: 0.3rem 0; }