:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #5f6368;
  --accent: #2b5fd9;
  --surface: #f5f6f8;
  --band: #ebedf0;
  --border: #e3e5e8;
  --tone-real: #2b63c6;
  --tone-mid: #8b9199;
  --tone-grounded: #e5484d;
  --maxw: 880px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121316;
    --fg: #e8e9eb;
    --muted: #9aa0a6;
    --accent: #7ea2ff;
    --surface: #1c1e22;
    --band: #24272c;
    --border: #2c2f34;
    --tone-real: #5b8def;
    --tone-mid: #7d838b;
    --tone-grounded: #f0646a;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
}

/* Hero */
.hero {
  text-align: center;
  padding: 72px 0 40px;
}
.venue {
  margin: 0 0 12px;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.hero h1 {
  margin: 0 0 20px;
  font-size: clamp(1.8rem, 4.5vw, 2.6rem);
  line-height: 1.2;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.authors { margin: 0 0 4px; font-size: 1.05rem; }
.authors a { color: var(--fg); }
.authors a:hover { color: var(--accent); }
.affiliations { margin: 0 0 28px; color: var(--muted); font-size: 0.95rem; }

.links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}
.btn {
  display: inline-block;
  padding: 8px 20px;
  border-radius: 999px;
  background: var(--fg);
  color: var(--bg);
  font-weight: 500;
  font-size: 0.95rem;
}
.btn:hover { opacity: 0.85; text-decoration: none; }

/* Sections */
section { padding: 28px 0; }
h2 {
  margin: 0 0 16px;
  font-size: 1.5rem;
  font-weight: 600;
}
/* Full-bleed gray title band; box-shadow + clip-path extend the background
   to the viewport edges without causing horizontal scroll. */
main section > h2 {
  margin: 0 0 28px;
  padding: 28px 0;
  font-size: 1.75rem;
  line-height: 1.3;
  text-align: center;
  background: var(--band);
  box-shadow: 0 0 0 100vmax var(--band);
  clip-path: inset(0 -100vmax);
}
section p { text-align: justify; hyphens: auto; }

figure { margin: 0 0 16px; }
figure img,
figure video {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 10px;
  background: var(--surface);
}
figcaption {
  margin-top: 8px;
  font-size: 0.9rem;
  color: var(--muted);
  text-align: center;
}

.teaser { padding-top: 8px; }

/* Wider than the text column, for dense figures */
.wide {
  max-width: 1160px;
  margin: 0 auto;
  padding-left: 20px;
  padding-right: 20px;
}
.wide .caption {
  max-width: var(--maxw);
  margin: 12px auto 0;
  padding: 0;
  font-size: 0.9rem;
  color: var(--muted);
  text-align: center;
}

/* White card so figures with white backgrounds sit cleanly in dark mode */
figure.fig-light {
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
}
figure.fig-light img {
  border-radius: 0;
  background: #ffffff;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

/* BibTeX */
.bibtex {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
}
.bibtex pre {
  margin: 0;
  padding: 18px 20px;
  overflow-x: auto;
  font-family: "JetBrains Mono", ui-monospace, Menlo, monospace;
  font-size: 0.85rem;
  line-height: 1.5;
}
.copy {
  position: absolute;
  top: 10px;
  right: 10px;
  padding: 4px 12px;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--fg);
  font: inherit;
  font-size: 0.8rem;
  cursor: pointer;
}
.copy:hover { border-color: var(--muted); }

footer {
  margin-top: 40px;
  padding: 28px 0 40px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.85rem;
  text-align: center;
}

/* Responsive 16:9 YouTube embed */
.video-embed {
  position: relative;
  aspect-ratio: 16 / 9;
  border-radius: 10px;
  overflow: hidden;
  background: var(--surface);
}
.video-embed iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

/* Results chart */
h3 { margin: 32px 0 8px; font-size: 1.15rem; font-weight: 600; }
.chart-card {
  margin-top: 20px;
  padding: 20px 20px 16px;
  border: 1px solid var(--border);
  border-radius: 10px;
}
.chart-title { margin: 0 0 12px; font-weight: 600; font-size: 0.95rem; text-align: left; }
.segmented {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 18px;
}
.segmented button {
  padding: 5px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg);
  color: var(--fg);
  font: inherit;
  font-size: 0.85rem;
  cursor: pointer;
}
.segmented button:hover { border-color: var(--muted); }
.segmented button[aria-checked="true"] { background: var(--fg); color: var(--bg); border-color: var(--fg); }
.segmented .n { opacity: 0.6; font-size: 0.8em; }

.bar-chart { position: relative; }
.bar-row,
.chart-axis {
  display: grid;
  grid-template-columns: 150px 1fr 92px;
  align-items: center;
  column-gap: 12px;
}
.bar-row { height: 34px; outline: none; }
.bar-row:focus-visible .bar-label { text-decoration: underline; }
.bar-label { font-size: 0.9rem; text-align: right; white-space: nowrap; }
.bar-group {
  margin: 10px 0 2px;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--muted);
}
.chart-tooltip + .bar-group { margin-top: 0; }
.bar-track {
  position: relative;
  height: 20px;
  border-left: 1px solid var(--border);
  background: linear-gradient(to right, transparent calc(50% - 0.5px), var(--border) calc(50% - 0.5px), var(--border) calc(50% + 0.5px), transparent calc(50% + 0.5px));
}
.bar {
  position: absolute;
  left: 0; top: 0; bottom: 0;
  border-radius: 0 4px 4px 0;
  transition: width 0.35s ease;
}
.tone-real { background: var(--tone-real); }
.tone-mid { background: var(--tone-mid); }
.tone-grounded { background: var(--tone-grounded); }
.bar-value { font-size: 0.9rem; font-variant-numeric: tabular-nums; }
.bar-value .frac { color: var(--muted); font-size: 0.85em; margin-left: 2px; }
.chart-axis { margin-top: 4px; font-size: 0.75rem; color: var(--muted); }
.chart-axis .ticks { grid-column: 2; position: relative; height: 1.2em; }
.chart-axis .ticks span { position: absolute; top: 0; transform: translateX(-50%); }
.chart-takeaway { margin: 14px 0 0; font-size: 0.95rem; text-align: left; }
.chart-note { margin: 8px 0 0; font-size: 0.8rem; color: var(--muted); text-align: left; }
.chart-tooltip {
  position: absolute;
  z-index: 2;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.12);
  font-size: 0.8rem;
  line-height: 1.45;
  pointer-events: none;
  white-space: nowrap;
}

/* Rollout clips */
.rollouts-intro { margin-top: 0; }
.rollouts {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
}
.rollouts figure { margin: 0; transition: opacity 0.25s ease; }
.clip-cond { color: var(--muted); }
.clip-outcome { color: var(--fg); }
.rollouts video { aspect-ratio: 1 / 1; object-fit: cover; }
.rollouts figcaption { text-align: left; font-size: 0.8rem; line-height: 1.45; }
.swatch {
  display: inline-block;
  width: 10px; height: 10px;
  margin-right: 5px;
  border-radius: 2px;
  vertical-align: baseline;
}

.wide-labels .bar-row,
.wide-labels .chart-axis { grid-template-columns: 200px 1fr 92px; }

@media (max-width: 640px) {
  .bar-row, .chart-axis { grid-template-columns: 112px 1fr 72px; column-gap: 8px; }
  .wide-labels .bar-row, .wide-labels .chart-axis { grid-template-columns: 124px 1fr 60px; }
  .bar-label { font-size: 0.8rem; white-space: normal; line-height: 1.2; }
  .bar-value .frac { display: none; }
  .chart-card { padding: 16px 12px 12px; }
  .rollouts { grid-template-columns: repeat(2, 1fr); }
}

/* Simulated data 2x2 grid */
.sim-grid {
  display: grid;
  grid-template-columns: auto 1fr 1fr;
  gap: 10px 14px;
  max-width: 720px;
  margin: 20px auto 0;
}
.axis-col {
  align-self: end;
  font-size: 0.85rem;
  font-weight: 600;
  text-align: center;
  line-height: 1.3;
}
.axis-sub { font-weight: 400; color: var(--muted); }
.axis-row {
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  align-self: center;
  font-size: 0.85rem;
  font-weight: 600;
  text-align: center;
}
.sim-cell { margin: 0; }
.sim-cell video { aspect-ratio: 1 / 1; object-fit: cover; }
.sim-cell figcaption { text-align: left; font-size: 0.8rem; }
.sim-note { margin-top: 14px; font-size: 0.85rem; color: var(--muted); }
@media (max-width: 640px) {
  .sim-grid { gap: 8px; }
  .axis-col, .axis-row { font-size: 0.75rem; }
}

/* Hero with looping background video */
.hero.has-video {
  position: relative;
  overflow: hidden;
  padding: 104px 0 80px;
  margin-bottom: 32px;
  color: #ffffff;
  background: #0d0e10;
}
.hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 25%;
  z-index: 0;
}
.hero-scrim {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(to bottom, rgba(8, 9, 11, 0.62), rgba(8, 9, 11, 0.74));
}
.hero.has-video .container { position: relative; z-index: 2; }
.hero.has-video h1 { text-shadow: 0 2px 16px rgba(0, 0, 0, 0.45); }
.hero.has-video .authors,
.hero.has-video .authors a { color: #ffffff; }
.hero.has-video .affiliations { color: rgba(255, 255, 255, 0.78); }
.hero.has-video .affiliations a { color: #ffffff; text-decoration: underline; text-underline-offset: 2px; }
.hero.has-video .btn { background: #ffffff; color: #111215; }
@media (prefers-reduced-motion: reduce) {
  .hero-bg { display: none; }
  .hero.has-video { background: #0d0e10 url("../images/posters/hero-loop.jpg") center 25% / cover no-repeat; }
}
@media (max-width: 640px) {
  .hero.has-video { padding: 72px 0 56px; }
}

/* Switching section: stacked rollouts beside the latent recording (equal heights) */
/* Side-by-side media wider than the text column; column ratios = media aspect ratios (equal heights) */
.media-pair {
  display: grid;
  gap: 14px;
  width: min(1120px, calc(100vw - 40px));
  position: relative;
  left: 50%;
  transform: translateX(-50%);
  margin-top: 20px;
}
.media-pair figure { margin: 0; }
.media-pair figcaption { text-align: left; font-size: 0.82rem; }
.switch-grid { grid-template-columns: 0.889fr 1.612fr; }
.craft-grid { grid-template-columns: 0.66fr 1.333fr; width: min(940px, calc(100vw - 40px)); }
.plot-img { background: #ffffff; border: 1px solid var(--border); }
.switch-frame { position: relative; }
.switch-tag {
  position: absolute;
  left: 8px;
  padding: 2px 8px;
  border-radius: 6px;
  background: rgba(0, 0, 0, 0.62);
  color: #ffffff;
  font-size: 0.75rem;
  line-height: 1.5;
}
.switch-latent video { border: 1px solid var(--border); }
@media (max-width: 760px) {
  .media-pair { grid-template-columns: 1fr; width: 100%; left: 0; transform: none; }
  .craft-grid figure:first-child { max-width: 320px; margin: 0 auto; }
  .switch-pair { max-width: 420px; margin: 0 auto; }
}