/* Base styles */
:root {
  --primary-color: #0f62fe;
  --text-color: #1f2937;
  --muted-text-color: #4b5563;
  --border-color: #e5e7eb;
  --background: #ffffff;
  --background-muted: #f9fafb;
  --code-background: #f5f7fb;
  --link-color:rgb(223, 18, 107); /* dark pink */
  --link-hover:rgb(156, 8, 87); /* deeper pink on hover */
  --radius: 10px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04), 0 1px 1px rgba(0,0,0,0.03);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
  --spacing-1: 0.25rem;
  --spacing-2: 0.5rem;
  --spacing-3: 0.75rem;
  --spacing-4: 1rem;
  --spacing-6: 1.5rem;
  --spacing-8: 2rem;
}

/* Reset and base styles */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: Avenir, 'Avenir Next', 'Avenir Next LT Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, Noto Sans, Ubuntu, Cantarell, Roboto, system-ui, sans-serif;
  line-height: 1.65;
  font-size: 1.0625rem;
  color: var(--text-color);
  background-color: var(--background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3 {
  line-height: 1.25;
  letter-spacing: -0.01em;
}

p { color: var(--muted-text-color); }

/* Accessibility helpers */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Header styles */
.site-header {
  text-align: center;
  padding: var(--spacing-8) var(--spacing-4);
  background: var(--background);
}

.site-header h1 {
  font-size: clamp(1.75rem, 1.5rem + 1vw, 2.25rem);
  margin-bottom: var(--spacing-2);
}

/* Paper metadata */
.paper-meta {
  margin: var(--spacing-4) 0;
}

.authors-list,
.institutions-list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
}

.authors-list li,
.institutions-list li {
  display: inline;
}

.authors-list a {
  color: var(--link-color);
  text-decoration: none;
}

.authors-list a:hover { text-decoration: underline; }

.publication-info {
  margin: var(--spacing-2) 0;
  font-size: 1rem;
  color: var(--muted-text-color);
}

/* Navigation */
.paper-links { margin: var(--spacing-6) 0; }

.links-list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-2);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  padding: 0.5rem 0.875rem;
  background: var(--background);
  border: 1px solid var(--border-color);
  border-radius: 999px;
  color: var(--text-color);
  text-decoration: none;
  transition: transform 0.06s ease, background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
  box-shadow: var(--shadow-sm);
}

.btn:hover:not(.disabled) {
  background: var(--background-muted);
  border-color: #cfd3d9;
  box-shadow: var(--shadow-md);
}

.btn .icon { margin-right: 0.25rem; }

.btn.disabled { opacity: 0.6; cursor: not-allowed; }

/* Main content */
main {
  max-width: 1000px;
  margin: 0 auto;
  padding: var(--spacing-4) var(--spacing-4);
}

/* Teaser figure */
.teaser-figure { margin: var(--spacing-8) 0; }

.teaser-figure img { max-width: 100%; height: auto; border-radius: var(--radius); box-shadow: var(--shadow-md); }

.teaser-figure figcaption { max-width: 70ch; margin: var(--spacing-2) auto 0; color: var(--muted-text-color); font-size: 0.95rem;  line-height: 1.25; font-style: italic;}

/* Paper content */
.paper-content { max-width: 760px; margin: 0 auto; }

.abstract, .bibtex { margin: var(--spacing-8) 0; }

/* Gallery */
.gallery { margin: var(--spacing-8) 0; padding-top: var(--spacing-8); }
.gallery h2 { border-bottom: 1px solid var(--border-color); padding-bottom: var(--spacing-2); margin-bottom: var(--spacing-4); }
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-4);
}
.gallery-item {
  display: block;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  background: var(--background);
}
.gallery-item img { width: 100%; height: auto; display: block; }
.gallery-item:focus-visible { outline: 2px solid var(--link-color); outline-offset: 2px; }

@media (max-width: 900px) {
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 580px) {
  .gallery-grid { grid-template-columns: 1fr; }
}

/* Lightbox */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.75);
  display: none;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-8) var(--spacing-4);
  z-index: 1000;
}
.lightbox[aria-hidden="false"] { display: flex; }
.lightbox__content { position: relative; max-width: 90vw; max-height: 80vh; display: flex; flex-direction: column; align-items: center; gap: var(--spacing-2); }
.lightbox__image { width: auto; height: auto; max-width: 80vw; max-height: 70vh; border-radius: var(--radius); box-shadow: var(--shadow-md); }
.lightbox__caption { color: #e5e7eb; text-align: center; font-size: 0.95rem; }
.lightbox__close, .lightbox__prev, .lightbox__next {
  position: absolute;
  background: rgba(255,255,255,0.9);
  color: #111827;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  padding: 0.35rem 0.6rem;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
}
.lightbox__close { top: 20px; right: 20px; font-size: 1.25rem; line-height: 1; }
.lightbox__prev, .lightbox__next { top: 50%; transform: translateY(-50%); font-size: 1.25rem; }
.lightbox__prev { left: 20px; }
.lightbox__next { right: 20px; }

@media (prefers-color-scheme: dark) {
  .lightbox__close, .lightbox__prev, .lightbox__next { background: rgba(17,24,39,0.9); color: #e5e7eb; border-color: #253047; }
}

/* Video */
.video { margin: var(--spacing-8) 0; padding-top: var(--spacing-8); }
.video h2 { border-bottom: 1px solid var(--border-color); padding-bottom: var(--spacing-2); margin-bottom: var(--spacing-4); }
.video-embed {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
  background: #000;
}
.video-embed iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.abstract { padding-top: var(--spacing-8); }
.bibtex { padding-top: var(--spacing-8); }
.abstract h2, .bibtex h2 {
  color: var(--text-color);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: var(--spacing-2);
  margin-bottom: var(--spacing-4);
}

.abstract p { margin-bottom: var(--spacing-4); }

.abstract p:last-child { margin-bottom: 0; }

/* Code block */
pre {
  background: var(--code-background);
  padding: var(--spacing-4);
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  overflow-x: auto;
  font-size: 0.95rem;
  line-height: 1.55;
}

code { font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace; }

/* Footer */
.site-footer {
  text-align: center;
  padding: var(--spacing-8) var(--spacing-4);
  background: var(--background);
  border-top: none;
  color: var(--muted-text-color);
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .site-header h1 { font-size: 2rem; }
  .authors-list, .institutions-list { flex-direction: column; align-items: center; }
  .links-list { flex-direction: column; align-items: stretch; }
  .btn { justify-content: center; }
}

/* Print styles */
@media print {
  .btn {
    display: none;
  }

  body {
    font-size: 12pt;
  }

  a {
    text-decoration: none;
  }

  a[href]::after {
    content: " (" attr(href) ")";
  }
}

/* Dark mode removed: keeping consistent light theme */