/* DR-SPCRL site styles (layered on top of bulma + nerfies index.css). */

:root {
  --accent: #3273dc;
  --accent-dark: #245da6;
  --ours: #d23a3a;
  --ink: #1a1a1a;
  --bg-alt: #f5f7fb;
}

body {
  font-family: 'Noto Sans', sans-serif;
  color: var(--ink);
}

/* ---------- Section-reveal (fade + slide, replays on scroll) ---------- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
  will-change: opacity, transform;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  .reveal, .reveal.is-visible {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}

.publication-title {
  font-family: 'Google Sans', sans-serif;
}

.section-alt {
  background: var(--bg-alt);
}

.tagline {
  margin-top: 1.5rem;
  font-size: 1.15rem;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.55;
}

.publication-links {
  margin-top: 1.25rem;
}
.publication-links .button {
  margin: 0 0.25rem;
}

/* ---------- KL ball explainer ---------- */

.kl-explainer {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  align-items: center;
  margin-top: 2rem;
}
.kl-canvas-wrapper {
  background: white;
  border-radius: 12px;
  padding: 1rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}
#kl-canvas { width: 100%; height: auto; display: block; }
#kl-worlds circle { cursor: pointer; transition: r 0.15s ease, fill 0.15s ease; }
#kl-worlds circle:hover { r: 6; }
.kl-controls label { display: block; font-weight: 600; margin-bottom: 0.5rem; }
.kl-eps-label { font-family: 'Google Sans', sans-serif; font-size: 1.2rem; }
#kl-slider { width: 100%; }
.kl-readout {
  display: flex;
  gap: 2rem;
  margin-top: 1.25rem;
}
.kl-readout > div {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}
.kl-stat-val {
  font-family: 'Google Sans', sans-serif;
  font-size: 2rem;
  font-weight: 600;
  color: var(--accent);
  line-height: 1;
}
.kl-stat-cap {
  font-size: 0.85rem;
  color: #666;
  margin-top: 0.25rem;
}
.kl-hover-wrap {
  margin-top: 1rem;
  position: relative;
}
.kl-hover-video {
  width: 100%;
  border-radius: 8px;
  background: #000;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  display: none;
}
.kl-hover-video.is-active { display: block; }
.kl-hover-stats {
  margin-top: 0.5rem;
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  font-size: 0.9rem;
  color: #888;
  font-style: italic;
}
.kl-hover-stats.is-active {
  color: #1a1a1a;
  font-style: normal;
}
.kl-stat-label {
  font-family: 'Google Sans', sans-serif;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  font-size: 0.78rem;
  letter-spacing: 0.05em;
}
.kl-stat-num {
  font-family: 'Castoro', serif;
  font-size: 0.95rem;
}
.kl-hint {
  margin-top: 1rem;
  color: #555;
  font-size: 0.95rem;
  line-height: 1.5;
}
.legend-low, .legend-high {
  font-weight: 600;
}
.legend-low  { color: #a50026; }
.legend-high { color: #1a9850; }

/* ---------- Motivation (scroll-triggered) ---------- */

.section-motivation {
  background: #ffffff;
  border-top: 1px solid #eee;
  border-bottom: 1px solid #eee;
}
.motivation-chart {
  background: #fafbff;
  border-radius: 12px;
  padding: 0.5rem;
  box-shadow: 0 1px 6px rgba(0,0,0,0.04);
  height: 420px;
  width: 100%;
  margin-top: 1.5rem;
}
.motivation-takeaway {
  margin-top: 1.5rem;
  text-align: center;
  font-size: 1rem;
  color: #444;
}

/* ---------- Mechanism explainer (formal derivation, stacked steps) ---------- */

.mech-explainer {
  margin: 2rem auto 2.5rem;
  max-width: 880px;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.mech-step-card {
  background: white;
  border: 1px solid #e8eaf0;
  border-radius: 12px;
  padding: 1.25rem 1.5rem 1.25rem 4.25rem;
  position: relative;
  box-shadow: 0 1px 4px rgba(0,0,0,0.04);
}
.mech-step-card-out {
  border-color: #d23a3a;
  box-shadow: 0 2px 12px rgba(210,58,58,0.18);
}
.mech-step-num {
  position: absolute;
  top: 1.25rem;
  left: 1.25rem;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--accent);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: 'Google Sans', sans-serif;
  font-weight: 600;
  font-size: 1.05rem;
}
.mech-step-card-out .mech-step-num { background: #d23a3a; }
.mech-step-head {
  font-family: 'Google Sans', sans-serif;
  font-weight: 600;
  font-size: 1.05rem;
  margin-bottom: 0.5rem;
  color: #1a1a1a;
}
.mech-step-body {
  font-size: 0.94rem;
  color: #2a2a2a;
  line-height: 1.55;
}
.mech-step-body p { margin: 0.5rem 0; }
.mech-eq {
  margin: 0.6rem 0;
  text-align: center;
  overflow-x: auto;
  font-size: 0.96rem;
}
.mech-bullets {
  margin: 0.5rem 0 0.25rem 1.1rem;
  font-size: 0.92rem;
  line-height: 1.5;
}
.mech-bullets li { margin-bottom: 0.35rem; }
.mech-spark {
  height: 110px;
  width: 100%;
  margin: 0.5rem 0 0.25rem;
}
.mech-sublaw {
  margin-top: 1.25rem;
  padding: 1rem 1.1rem;
  background: #f6f8fd;
  border-left: 3px solid var(--accent);
  border-radius: 8px;
  font-size: 0.9rem;
  line-height: 1.5;
  color: #2a2a2a;
}
.mech-sublaw-title {
  font-family: 'Google Sans', sans-serif;
  font-weight: 600;
  color: var(--accent-dark);
  margin-bottom: 0.4rem;
  font-size: 0.98rem;
}
.mech-sublaw p { margin: 0.4rem 0; }

.mech-slider-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin-top: 1rem;
}
.mech-slider-col label {
  display: block;
  font-size: 0.88rem;
  margin-bottom: 0.3rem;
  color: #444;
  font-family: 'Google Sans', sans-serif;
}
.mech-slider-col label span {
  color: #d23a3a;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}
.mech-slider-col input[type="range"] {
  width: 100%;
  accent-color: #d23a3a;
}
.mech-spark-cap {
  font-size: 0.82rem;
  color: #666;
  line-height: 1.4;
  text-align: center;
  margin-bottom: 0.25rem;
}

/* ---------- Loop diagram ---------- */

.loop-diagram {
  display: grid;
  grid-template-columns: repeat(7, auto);
  align-items: stretch;
  justify-content: center;
  gap: 0.5rem;
  margin: 2rem 0 2.5rem;
  flex-wrap: wrap;
}
.loop-card {
  background: white;
  border: 1px solid #e5e7ef;
  border-radius: 10px;
  padding: 1rem;
  width: 165px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
  position: relative;
}
.loop-card-highlight {
  border-color: var(--ours);
  box-shadow: 0 2px 10px rgba(210, 58, 58, 0.18);
}
.loop-step {
  position: absolute;
  top: -10px;
  left: -10px;
  background: var(--accent);
  color: white;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 600;
}
.loop-card-highlight .loop-step { background: var(--ours); }
.loop-title { font-weight: 600; font-size: 0.95rem; margin-bottom: 0.35rem; }
.loop-text { font-size: 0.82rem; color: #555; line-height: 1.4; }
.loop-arrow { align-self: center; color: #888; font-size: 1.3rem; }

/* ---------- Training returns interactive grid ---------- */

.training-grid {
  width: 100%;
  height: 920px;
  background: white;
  border-radius: 12px;
  box-shadow: 0 1px 5px rgba(0,0,0,0.05);
}
.training-cap {
  margin-top: 0.75rem;
  font-size: 0.9rem;
  color: #555;
  line-height: 1.5;
}

/* ---------- Figures ---------- */

.figure-block {
  margin: 1.5rem auto;
  max-width: 950px;
}
.figure-block img {
  width: 100%;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}
.figure-block figcaption {
  font-size: 0.9rem;
  color: #555;
  margin-top: 0.75rem;
  line-height: 1.5;
}

/* ---------- Results controls / chart / table ---------- */

.results-controls {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}
.control-group { text-align: center; }
.control-label {
  display: block;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #666;
  margin-bottom: 0.4rem;
}
.results-controls .button.is-active {
  background-color: var(--accent);
  color: white;
  border-color: var(--accent);
}

.results-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 2rem;
  align-items: start;
}
#results-chart {
  width: 100%;
  height: 440px;
  background: white;
  border-radius: 10px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  padding: 0.5rem;
}
.results-table-wrapper {
  background: white;
  border-radius: 10px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  padding: 0.75rem 1rem;
  overflow-x: auto;
}
#results-table {
  font-size: 0.88rem;
}
#results-table th {
  font-family: 'Google Sans', sans-serif;
  font-weight: 500;
  font-size: 0.85rem;
}
#results-table tr.row-ours {
  background: rgba(210, 58, 58, 0.08) !important;
  font-weight: 600;
}
#results-table td.best {
  color: var(--ours);
  font-weight: 600;
}

.result-highlight {
  text-align: center;
  margin-top: 1.5rem;
  font-size: 1.05rem;
  color: #444;
}
.result-highlight strong { color: var(--ours); }

/* ---------- Epsilon trajectory grid ---------- */

.eps-traj-grid {
  width: 100%;
  height: 760px;
  background: white;
  border-radius: 12px;
  box-shadow: 0 1px 5px rgba(0,0,0,0.05);
}
.eps-traj-cap {
  margin-top: 0.75rem;
  font-size: 0.9rem;
  color: #555;
  line-height: 1.5;
}

/* ---------- Epsilon per-state grid ---------- */

.eps-grid, .ablation-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin-top: 1.5rem;
}
.eps-grid figure, .ablation-grid figure { text-align: center; }
.eps-grid img, .ablation-grid img {
  width: 100%;
  border-radius: 8px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.08);
}
.eps-grid figcaption, .ablation-grid figcaption {
  margin-top: 0.5rem;
  font-weight: 600;
  font-size: 0.95rem;
}

.ablation-controls {
  display: flex;
  justify-content: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 0.5rem;
}
.ablation-controls .button.is-active {
  background-color: var(--accent);
  color: white;
  border-color: var(--accent);
}

/* ---------- BibTeX ---------- */

#BibTeX pre {
  background: #1f2330;
  color: #e6e6e6;
  padding: 1.25rem;
  border-radius: 8px;
  font-size: 0.85rem;
  overflow-x: auto;
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .kl-explainer { grid-template-columns: 1fr; }
  .results-grid { grid-template-columns: 1fr; }
  .loop-diagram { grid-template-columns: 1fr; }
  .loop-arrow { display: none; }
  .ablation-grid { grid-template-columns: 1fr; }
}