:root {
  color-scheme: dark;
  --bg: #101214;
  --panel: #191c20;
  --surface: #22262b;
  --border: #343a41;
  --text: #e8ecef;
  --muted: #929ca6;
  --accent: #f5d1b8;   /* orange, dim: rgb(0.96, 0.82, 0.72) */
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 Inter, ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
.wrap {
  width: min(1040px, 100% - 32px);
  margin: 0 auto;
}

/* ── hero ── */
.hero {
  padding: clamp(40px, 8vw, 88px) 0 clamp(28px, 5vw, 48px);
  text-align: center;
  border-bottom: 1px solid var(--border);
  background: radial-gradient(ellipse at top, #1a2126 0%, var(--bg) 70%);
}
.hero h1 {
  margin: 0 0 10px;
  font-size: clamp(28px, 5vw, 44px);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.01em;
}
.subtitle { margin: 0 0 22px; color: var(--muted); font-size: clamp(16px, 2.2vw, 19px); }
.authors { margin: 0; font-size: clamp(15px, 2vw, 18px); }
.authors a { color: var(--text); }
.authors sup, .affiliations sup { color: var(--muted); font-size: .65em; }
.affiliations { margin: 6px 0 22px; color: var(--muted); font-size: 15px; }
.links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}
.button {
  display: inline-block;
  padding: 9px 16px;
  border: 1px solid var(--border);
  border-radius: 0;
  background: var(--surface);
  color: var(--text);
  font-weight: 600;
  font-size: 15px;
}
.button:hover { text-decoration: none; border-color: #4d5760; background: #2a3037; }

/* ── sections ── */
main section { padding: clamp(28px, 5vw, 48px) 0 0; }
h2 {
  margin: 0 0 12px;
  font-size: clamp(20px, 3vw, 26px);
  font-weight: 650;
}
#abstract p { margin: 0; color: #cfd6dc; text-align: justify; hyphens: auto; }
.lede { margin: 0 0 16px; color: var(--muted); }

.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 18px;
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 13px;
}
.legend i {
  display: inline-block;
  width: 10px;
  height: 10px;
  margin-right: 6px;
  border-radius: 0;
  vertical-align: -1px;
}

/* ── agentic timelapse: frames → video, as a diagram ── */
.timelapse {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 44px minmax(0, 1fr);
  align-items: center;
  gap: 12px;
  margin: 0;
}
.timelapse-frames, .timelapse-video {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--panel);
}
/* The video wears the viewer cards' timeline (viewer.css .viewer-timeline,
   accent slider) along its bottom edge, inset like on the cards. Playing state
   comes from the same is-playing class, set by js/timelapse.js. */
.timelapse-clip { position: relative; min-width: 0; }
.timelapse-clip.is-playing .viewer-play::before { content: "❚❚"; font-size: 12px; }
/* The arrow: a line with a head, in a dim orange. */
.timelapse { --arrow: #b8792f; }
.timelapse-arrow {
  position: relative;
  height: 2px;
  background: var(--arrow);
}
.timelapse-arrow::after {
  content: "";
  position: absolute;
  top: -6px;
  right: -1px;
  border: 7px solid transparent;
  border-right: 0;
  border-left: 12px solid var(--arrow);
}
@media (max-width: 640px) {
  .timelapse { grid-template-columns: 1fr; }
  .timelapse-arrow { width: 2px; height: 36px; margin: 0 auto; }
  .timelapse-arrow::after {
    top: auto;
    right: -6px;
    bottom: -1px;
    border: 7px solid transparent;
    border-bottom: 0;
    border-top: 12px solid var(--arrow);
  }
}

pre {
  margin: 0;
  padding: 14px 16px;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 0;
  background: var(--panel);
  font: 13px/1.5 ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

footer {
  margin-top: clamp(36px, 6vw, 64px);
  padding: 20px 0 max(24px, env(safe-area-inset-bottom));
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 14px;
}

/* ── carousel ── */
.carousel { position: relative; }
.carousel-track {
  display: flex;
  gap: 16px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
  outline: none;
}
.carousel-track::-webkit-scrollbar { display: none; }
.carousel-track > .viewer {
  flex: 0 0 100%;
  scroll-snap-align: center;
  scroll-snap-stop: always;
}
.carousel-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  margin-top: 12px;
}
.carousel-prev, .carousel-next {
  width: 40px;
  height: 40px;
  border: 1px solid var(--border);
  border-radius: 0;
  background: var(--surface);
  color: var(--text);
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
}
.carousel-prev:hover, .carousel-next:hover { background: #2a3037; }
.carousel-dots { display: flex; align-items: center; gap: 8px; min-width: 0; }
.carousel-dots button {
  width: 10px;
  height: 10px;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: #3d454d;
  cursor: pointer;
}
.carousel-dots button.active { background: var(--accent); }
/* Thumbnails (scripts/make_thumbs.py): the first frame of each example; the
   live one carries the accent frame, the others sit dimmed. */
.carousel-dots button.thumb {
  width: 56px;
  height: 56px;
  border: 2px solid transparent;
  background: var(--panel);
  opacity: .55;
  transition: opacity .15s;
}
.carousel-dots button.thumb img { display: block; width: 100%; height: 100%; object-fit: cover; }
.carousel-dots button.thumb:hover { opacity: .85; }
.carousel-dots button.thumb.active { border-color: var(--accent); background: var(--panel); opacity: 1; }
@media (max-width: 640px) {
  .carousel-nav { gap: 8px; }
  .carousel-dots { gap: 5px; }
  .carousel-dots button.thumb { width: 36px; height: 36px; }
  .carousel-counter { display: none; }
}
.carousel-counter {
  min-width: 48px;
  color: var(--muted);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  text-align: center;
}
.carousel-note { margin: 8px 0 0; color: #e0a06a; font-size: 14px; text-align: center; }
.carousel-note:empty { display: none; }

body.has-fullscreen-viewer { overflow: hidden; }