:root {
  --bg: #fbfaf7;
  --bg-alt: #f2efe8;
  --ink: #23271f;
  --ink-soft: #52584c;
  --line: #ddd8cb;
  --accent: #8a5a3a;
  --accent-2: #4a6b5a;
  --card: #ffffff;
  --max-w: 980px;
  --radius: 10px;
  --shadow: 0 2px 18px rgba(40, 35, 20, 0.08);
  font-size: 16px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: 'Newsreader', Georgia, serif;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.01em;
}

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

code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  background: var(--bg-alt);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 0.1em 0.35em;
  font-size: 0.9em;
  color: var(--accent);
}

/* Progress bar */
.progress-bar {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  z-index: 1000;
  transition: width 0.1s linear;
}

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 500;
  background: rgba(251, 250, 247, 0.85);
  backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0.85rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.nav-brand {
  font-family: 'Newsreader', serif;
  font-weight: 600;
  font-size: 1.02rem;
  color: var(--ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.nav-brand:hover { text-decoration: none; color: var(--accent); }
.nav-links {
  display: flex;
  gap: 1.5rem;
  font-size: 0.92rem;
  font-weight: 500;
}
.nav-links a { color: var(--ink-soft); }
.nav-links a:hover { color: var(--accent); text-decoration: none; }
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
}
.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
}

/* Hero */
.hero {
  padding: 4.5rem 1.5rem 3rem;
  background: radial-gradient(1200px 500px at 50% -10%, #eee7d9 0%, var(--bg) 60%);
  border-bottom: 1px solid var(--line);
}
.hero-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  text-align: center;
}
.venue-tag {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent-2);
  margin: 0 0 0.9rem;
}
.hero h1 {
  font-size: clamp(1.9rem, 4.4vw, 2.85rem);
  margin: 0 0 1.6rem;
  line-height: 1.18;
}
.authors {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.35rem 1.1rem;
  padding: 0;
  margin: 0 0 0.9rem;
  font-size: 1.05rem;
}
.authors li { color: var(--ink); }
.authors a { color: var(--ink); border-bottom: 1px dashed var(--line); cursor: default; }
.authors a:hover { text-decoration: none; }
.authors sup { color: var(--accent); margin-left: 1px; }

.affiliations {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.3rem 1.4rem;
  padding: 0;
  margin: 0 0 0.35rem;
  font-size: 0.9rem;
  color: var(--ink-soft);
}
.corresponding {
  font-size: 0.82rem;
  color: var(--ink-soft);
  margin: 0 0 2rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.7rem;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.1rem;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink);
  font-size: 0.92rem;
  font-weight: 500;
  box-shadow: var(--shadow);
  transition: transform 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}
.btn:hover { transform: translateY(-1px); border-color: var(--accent); color: var(--accent); text-decoration: none; }
.btn-primary { background: var(--ink); color: #fff; border-color: var(--ink); }
.btn-primary:hover { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-disabled { opacity: 0.55; cursor: not-allowed; }
.btn-disabled:hover { transform: none; border-color: var(--line); color: var(--ink); }

/* Teaser */
.teaser {
  max-width: 860px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 1rem;
}
.teaser figure { margin: 0; }
.teaser img {
  width: 100%;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--line);
  cursor: zoom-in;
}
.teaser figcaption {
  margin-top: 1rem;
  font-size: 0.92rem;
  color: var(--ink-soft);
  padding: 0 0.25rem;
}

/* Sections */
.section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 3.5rem 1.5rem;
}
.section.alt {
  max-width: none;
  background: var(--bg-alt);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.section.alt > h2,
.section.alt > .text-block,
.section.alt > .bibtex-wrap {
  max-width: var(--max-w);
  margin-left: auto;
  margin-right: auto;
}

.section h2 {
  font-size: 1.7rem;
  display: flex;
  align-items: baseline;
  gap: 0.9rem;
  margin: 0 0 1.6rem;
}
.kicker {
  font-family: 'Inter', sans-serif;
  font-size: 0.85rem;
  font-weight: 700;
  color: #b9ad8f;
  letter-spacing: 0.05em;
}

.abstract-text {
  font-size: 1.08rem;
  color: var(--ink-soft);
  max-width: 800px;
}
.abstract-text strong { color: var(--ink); }

.keywords {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.4rem;
}
.keywords span {
  font-size: 0.8rem;
  padding: 0.3rem 0.75rem;
  border-radius: 999px;
  background: var(--bg-alt);
  border: 1px solid var(--line);
  color: var(--ink-soft);
}

.text-block { margin: 0 0 1.8rem; max-width: 800px; }
.text-block h3 {
  font-size: 1.2rem;
  margin: 0 0 0.6rem;
}
.text-block p { color: var(--ink-soft); margin: 0; }
.checklist {
  margin: 0.9rem 0 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}
.checklist li {
  position: relative;
  padding-left: 1.4rem;
  color: var(--ink-soft);
}
.checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-2);
}
.checklist strong { color: var(--ink); }

.figure-block {
  max-width: 620px;
  margin: 0 auto 2.2rem;
}
.figure-block--sm { max-width: 420px; }
.figure-block--lg { max-width: 760px; }
.figure-block img {
  width: 100%;
  display: block;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: #fff;
  box-shadow: var(--shadow);
  cursor: zoom-in;
}
.figure-block figcaption {
  margin-top: 0.85rem;
  font-size: 0.86rem;
  color: var(--ink-soft);
  text-align: left;
}
.figure-block figcaption strong { color: var(--ink); }

/* BibTeX */
.bibtex-wrap { position: relative; }
#bibtexBlock {
  background: #1f2419;
  color: #eef0e6;
  padding: 1.4rem 1.6rem;
  border-radius: var(--radius);
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.55;
  box-shadow: var(--shadow);
}
.copy-btn {
  position: absolute;
  top: 0.8rem;
  right: 0.8rem;
  background: rgba(255,255,255,0.1);
  color: #eef0e6;
  border: 1px solid rgba(255,255,255,0.25);
  border-radius: 6px;
  padding: 0.35rem 0.8rem;
  font-size: 0.8rem;
  cursor: pointer;
  transition: background 0.15s ease;
}
.copy-btn:hover { background: rgba(255,255,255,0.22); }

/* Footer */
.site-footer {
  text-align: center;
  padding: 2.5rem 1.5rem 3rem;
  font-size: 0.82rem;
  color: var(--ink-soft);
}
.site-footer p { margin: 0.3rem 0; }

/* Lightbox */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(20, 18, 12, 0.92);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  padding: 3rem 1.5rem;
}
.lightbox.open { display: flex; }
.lightbox img {
  max-width: 100%;
  max-height: 100%;
  border-radius: 6px;
  box-shadow: 0 10px 50px rgba(0,0,0,0.5);
}
.lightbox-close {
  position: absolute;
  top: 1.2rem;
  right: 1.6rem;
  background: none;
  border: none;
  color: #fff;
  font-size: 2.2rem;
  line-height: 1;
  cursor: pointer;
}

/* Responsive */
@media (max-width: 760px) {
  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    padding: 1rem 1.5rem;
    gap: 0.9rem;
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: flex; }
  .hero { padding: 3.2rem 1.2rem 2.2rem; }
  .section { padding: 2.6rem 1.2rem; }
}