/* Color scheme from horse logo */
:root {
  --teal: #2c6c67;
  --maroon: #722F37;
  --cream: #e8e4de;
  --dark: #333;
  --light: #f5f3f0;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: Georgia, 'Times New Roman', serif;
  background-color: var(--cream);
  color: var(--dark);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
header {
  background-color: var(--teal);
  color: var(--light);
  text-align: center;
  padding: 2rem 1rem;
}

.logo {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  border: 3px solid var(--cream);
  margin-bottom: 1rem;
}

header h1 {
  font-size: 2.5rem;
  font-weight: normal;
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
}

.subtitle {
  font-style: italic;
  opacity: 0.9;
  font-size: 1.1rem;
}

/* Main content */
main {
  flex: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1rem;
  width: 100%;
}

/* Image grid */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1rem;
}

.grid-item {
  position: relative;
  aspect-ratio: 1;
  overflow: hidden;
  border-radius: 4px;
  cursor: pointer;
  border: 3px solid var(--maroon);
  background: var(--dark);
}

.grid-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
}

.grid-item:hover img {
  transform: scale(1.05);
}

/* Hover caption overlay */
.hover-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 1rem;
  background: linear-gradient(transparent, rgba(0, 0, 0, 0.85));
  color: white;
  font-size: 0.9rem;
  line-height: 1.4;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.grid-item:hover .hover-caption {
  opacity: 1;
  transform: translateY(0);
}

/* Lightbox */
.lightbox {
  position: fixed;
  inset: 0;
  background: rgba(200, 190, 175, 0.92);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.lightbox.active {
  opacity: 1;
  visibility: visible;
}

/* Control bar at top */
.lightbox-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  padding: 1rem;
  background: rgba(44, 108, 103, 0.9);
}

/* Group spacing: << < | counter | > >> | comment x */
.lightbox-controls .nav-btn.first,
.lightbox-controls .nav-btn.prev {
  margin-right: 0.125rem;
}

.lightbox-controls .nav-btn.next,
.lightbox-controls .nav-btn.last {
  margin-right: 0.125rem;
}

#comment-link {
  margin-left: 0.75rem;
  margin-right: 2px;
}

.slide-counter {
  color: var(--cream);
  font-size: 1rem;
  margin: 0 0.5rem;
  min-width: 60px;
  text-align: center;
}

.slides-container {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 2rem 1rem 1rem;
  overflow-y: auto;
}

/* Book-style layout: image left, text right */
.slide {
  display: none;
  flex-direction: row;
  align-items: flex-start;
  justify-content: center;
  gap: 2rem;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
}

.slide.active {
  display: flex;
}

/* Image fits its content, anchored to top */
.slide img {
  flex: 0 1 auto;
  max-width: 45%;
  max-height: calc(100vh - 140px);
  object-fit: contain;
  border: 4px solid var(--maroon);
  border-radius: 4px;
  position: sticky;
  top: 0;
}

/* Caption panel in lightbox - right side, can extend past viewport */
.caption-panel {
  flex: 0 1 420px;
  min-width: 280px;
  padding: 1.5rem;
  background: var(--cream);
  border-radius: 4px;
  border: 2px solid var(--maroon);
  color: var(--dark);
}

.caption-text {
  font-size: 0.95rem;
  line-height: 1.75;
}

/* Footnotes - Gwern-style hover tooltips */
.footnote-ref {
  position: relative;
  color: var(--teal);
  cursor: help;
  text-decoration: underline;
  text-decoration-style: dotted;
  text-underline-offset: 2px;
}

.footnote-ref sup {
  font-size: 0.75em;
  font-weight: 600;
}

.footnote-tooltip {
  position: absolute;
  top: 50%;
  right: 100%;
  transform: translateY(-50%);
  width: 320px;
  padding: 0.75rem 1rem;
  background: var(--dark);
  color: var(--cream);
  font-size: 0.85rem;
  line-height: 1.5;
  border-radius: 4px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s ease;
  z-index: 100;
  margin-right: 10px;
  text-align: left;
  font-weight: normal;
  text-decoration: none;
}

.footnote-tooltip::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 100%;
  transform: translateY(-50%);
  border: 6px solid transparent;
  border-left-color: var(--dark);
}

.footnote-ref:hover .footnote-tooltip,
.footnote-ref:focus .footnote-tooltip {
  opacity: 1;
  visibility: visible;
}

.footnote-tooltip a {
  color: var(--cream);
  text-decoration: underline;
}

.footnote-tooltip a:hover {
  text-decoration: none;
}

/* Lightbox controls */
.nav-btn, .close-btn {
  width: 44px;
  height: 44px;
  background: rgba(255, 255, 255, 0.2);
  border: none;
  color: var(--cream);
  font-size: 1.5rem;
  cursor: pointer;
  border-radius: 4px;
  transition: background 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-btn:hover, .close-btn:hover {
  background: rgba(255, 255, 255, 0.35);
}

.close-btn {
  font-size: 1.8rem;
}

/* Lightbox footer */
.lightbox-footer {
  padding: 0.75rem 1rem;
  background: rgba(44, 108, 103, 0.9);
  color: var(--cream);
  text-align: center;
  font-size: 0.9rem;
  width: 100%;
  margin-top: 2rem;
  flex-shrink: 0;
}

.lightbox-footer a {
  color: var(--cream);
  text-decoration: underline;
}

.lightbox-footer a:hover {
  text-decoration: none;
}

/* Footer */
footer {
  background-color: var(--teal);
  color: var(--light);
  text-align: center;
  padding: 1.5rem 1rem;
  margin-top: auto;
}

footer a {
  color: var(--cream);
  text-decoration: underline;
}

footer a:hover {
  text-decoration: none;
}

.copyright {
  font-size: 0.85rem;
  opacity: 0.8;
  margin-top: 0.5rem;
}

/* Responsive - stack vertically on mobile */
@media (max-width: 900px) {
  .slide {
    flex-direction: column;
    align-items: center;
    gap: 1rem;
  }

  .slide img {
    max-width: 90%;
    max-height: 45vh;
    position: static;
  }

  .caption-panel {
    min-width: unset;
    width: 90%;
  }

  .footnote-tooltip {
    width: 240px;
    right: auto;
    left: 0;
    top: 100%;
    transform: none;
    margin-right: 0;
    margin-top: 8px;
  }

  .footnote-tooltip::after {
    top: -12px;
    left: 20px;
    transform: none;
    border: 6px solid transparent;
    border-bottom-color: var(--dark);
  }
}

@media (max-width: 768px) {
  header h1 {
    font-size: 1.8rem;
  }

  .logo {
    width: 60px;
    height: 60px;
  }

  .grid {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 0.5rem;
  }

  .grid-item {
    border-width: 2px;
  }

  .hover-caption {
    font-size: 0.8rem;
    padding: 0.75rem;
  }

  .lightbox-controls {
    padding: 0.75rem;
    gap: 0.25rem;
  }

  .nav-btn, .close-btn {
    width: 36px;
    height: 36px;
    font-size: 1.2rem;
  }

  .nav-btn svg {
    width: 14px;
    height: 14px;
  }

  .slide-counter {
    font-size: 0.85rem;
    min-width: 50px;
  }

  .slide img {
    border-width: 3px;
  }

  .caption-panel {
    padding: 1rem;
  }

  .caption-text {
    font-size: 0.9rem;
  }
}

/* Scrollbar styling for caption panel */
.caption-panel::-webkit-scrollbar {
  width: 8px;
}

.caption-panel::-webkit-scrollbar-track {
  background: var(--light);
  border-radius: 4px;
}

.caption-panel::-webkit-scrollbar-thumb {
  background: var(--teal);
  border-radius: 4px;
}