:root {
  --bg: #f5f2ec;
  --surface: #fcfbf8;
  --line: rgba(24, 37, 54, 0.14);
  --line-strong: rgba(24, 37, 54, 0.24);
  --text: #162334;
  --muted: #58697d;
  --text-secondary: #58697d;
  --text-body: rgba(22, 35, 52, 0.88);
  --accent: #21466f;
  --accent-soft: rgba(33, 70, 111, 0.08);
  --max-width: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: #f7f4ef;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: min(calc(100% - 3rem), var(--max-width));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(14px);
  background: rgba(247, 244, 239, 0.82);
  border-bottom: 1px solid rgba(24, 37, 54, 0.08);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 4.5rem;
}

.brand {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.section-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  color: var(--text-secondary);
  font-size: 0.96rem;
}

.section-nav a {
  transition: color 140ms ease;
}

.section-nav a:hover,
.section-nav a:focus-visible {
  color: var(--accent);
}

.hero {
  padding: 5.75rem 0 4.4rem;
}

.hero-inner {
  max-width: none;
  text-align: center;
}

.eyebrow,
.section-kicker {
  margin: 0 0 1rem;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1,
h2,
p,
ul {
  margin: 0;
}

h1 {
  max-width: none;
  width: 100%;
  margin: 0 auto;
  font-size: clamp(2.85rem, 4.95vw, 4.82rem);
  line-height: 0.98;
  font-weight: 650;
  text-wrap: balance;
}

.hero-copy {
  max-width: 54rem;
  margin-top: 1.5rem;
  font-size: 1.15rem;
  line-height: 1.72;
  color: var(--text-secondary);
  margin-left: auto;
  margin-right: auto;
}

.author-block {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line-strong);
}

.authors {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem 1.35rem;
  font-size: 1.35rem;
  line-height: 1.6;
  font-weight: 500;
}

.author {
  white-space: nowrap;
}

.author a {
  color: inherit;
  text-decoration: underline;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.14em;
  text-decoration-color: rgba(33, 70, 111, 0.22);
  transition:
    color 140ms ease,
    text-decoration-color 140ms ease;
}

.author a:hover,
.author a:focus-visible {
  color: var(--accent);
  text-decoration-color: currentColor;
}

.author sup,
.affiliation-list sup,
.author-notes sup {
  font-size: 0.66em;
  vertical-align: super;
}

.affiliation-list {
  margin-top: 0.9rem;
}

.affiliation-list p {
  max-width: 72rem;
  margin-left: auto;
  margin-right: auto;
  font-size: 1.08rem;
  line-height: 1.75;
  color: var(--text-secondary);
}

.author-notes {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  margin-top: 0.8rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.hero-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.9rem;
}

.project-button {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  min-height: 4.2rem;
  padding: 0.9rem 1.55rem;
  border: none;
  border-radius: 999px;
  background: #373737;
  color: #ffffff;
  font: inherit;
  font-size: 1.1rem;
  font-weight: 500;
  opacity: 1;
}

.project-button:disabled {
  cursor: default;
}

.button-icon {
  width: 1.3rem;
  height: 1.3rem;
  flex: 0 0 auto;
}

.hero-action-note {
  margin-top: 0.8rem;
  font-size: 0.94rem;
  color: var(--text-secondary);
}

.overview-section,
.abstract-section,
.strengths-section,
.experiments-section {
  scroll-margin-top: 5.75rem;
}

.overview-section,
.abstract-section {
  padding: 2rem 0 5.5rem;
}

.section-intro {
  margin-bottom: 1.75rem;
}

.section-intro h2 {
  max-width: 18ch;
  font-size: clamp(2rem, 3.1vw, 3rem);
  line-height: 1.05;
  font-weight: 650;
  text-wrap: balance;
}

.section-copy {
  max-width: 52rem;
  margin-top: 1rem;
  font-size: 1.06rem;
  line-height: 1.8;
  color: var(--text-secondary);
}

.overview-frame {
  width: min(calc(100% - 3rem), 980px);
  margin: 0 auto;
  padding: 1.25rem;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgba(252, 251, 248, 0.58);
}

.overview-frame img {
  width: 100%;
  height: auto;
}

.intro-shell {
  max-width: 960px;
}

.intro-head {
  max-width: 46rem;
  margin: 0 auto 1.9rem;
  text-align: center;
}

.intro-head h2 {
  max-width: none;
  margin-left: auto;
  margin-right: auto;
}

.intro-lead {
  max-width: 42rem;
  margin: 1rem auto 0;
  font-size: 1.08rem;
  line-height: 1.82;
  color: var(--text-secondary);
}

.intro-body {
  max-width: 50rem;
  margin: 0 auto;
}

.intro-body p {
  font-size: 1.05rem;
  line-height: 1.95;
  color: var(--text-body);
}

.abstract-section .intro-body {
  max-width: 48rem;
  margin-left: auto;
  margin-right: auto;
}

.abstract-section .intro-body p {
  text-align: justify;
  text-justify: inter-word;
}

.intro-body p + p {
  margin-top: 1.5rem;
}

.intro-body strong {
  font-weight: 700;
  color: var(--text);
}

.strengths-section {
  padding: 0 0 5.5rem;
}

.strengths-intro {
  max-width: 58rem;
}

.strengths-copy {
  max-width: 44rem;
}

.overview-section .section-intro h2,
.strengths-intro h2 {
  max-width: none;
}

.strengths-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 2.1rem;
  margin-top: 2rem;
}

.strength-item {
  padding-top: 1.2rem;
  border-top: 1px solid var(--line-strong);
}

.strength-item h3 {
  font-size: 1.22rem;
  line-height: 1.35;
  font-weight: 650;
}

.strength-item p {
  margin-top: 0.85rem;
  color: var(--text-body);
  font-size: 1rem;
  line-height: 1.85;
}

.experiments-section {
  padding: 0 0 6rem;
}

.experiments-intro {
  max-width: 62rem;
}

.experiments-intro h2 {
  max-width: none;
}

.results-block {
  margin-top: 3rem;
  padding-top: 2.2rem;
  border-top: 1px solid var(--line-strong);
}

.results-copy {
  max-width: 62rem;
}

.results-kicker,
.artifact-label {
  margin: 0 0 0.8rem;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.results-copy h3,
.artifact-head h4 {
  margin: 0;
  font-size: clamp(1.55rem, 2vw, 2rem);
  line-height: 1.12;
  font-weight: 650;
}

.results-copy p,
.artifact-caption,
.task-summary,
.metrics-table,
.paper-figure figcaption {
  color: var(--text-body);
  font-size: 1rem;
  line-height: 1.82;
}

.results-copy p:last-child {
  margin-top: 1rem;
}

.artifact-block {
  margin-top: 1.8rem;
}

.artifact-head {
  max-width: 58rem;
}

.table-shell {
  margin-top: 1rem;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(252, 251, 248, 0.76);
}

.metrics-table {
  width: 100%;
  min-width: 920px;
  border-collapse: collapse;
}

.metrics-table th,
.metrics-table td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--line);
  text-align: center;
  vertical-align: middle;
}

.metrics-table thead th {
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--text);
  background: rgba(33, 70, 111, 0.05);
}

.metrics-table tbody th {
  text-align: left;
  font-weight: 600;
  color: var(--text);
}

.metrics-table tbody tr.separator th,
.metrics-table tbody tr.separator td {
  border-top: 1.5px solid var(--line-strong);
}

.metrics-table tbody tr.final-row {
  background: rgba(33, 70, 111, 0.06);
}

.metrics-table tbody tr:last-child th,
.metrics-table tbody tr:last-child td {
  border-bottom: none;
}

.is-best {
  font-weight: 700;
  color: var(--text);
}

.is-second {
  text-decoration: underline;
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.15em;
}

.artifact-caption {
  max-width: 60rem;
  margin-top: 0.9rem;
}

.artifact-description {
  max-width: 60rem;
  margin-top: 1rem;
  color: var(--text-body);
  font-size: 1rem;
  line-height: 1.82;
}

.artifact-description p {
  margin: 0;
}

.artifact-description p + p {
  margin-top: 0.85rem;
}

.inline-task-token,
.reward-token {
  display: inline-block;
  padding: 0.08em 0.35em;
  border-radius: 0.35em;
  background: rgba(33, 70, 111, 0.06);
  color: var(--text);
  font-family: SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono",
    "Courier New", monospace;
  font-size: 0.9em;
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0;
  white-space: nowrap;
}

.two-figure-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.2rem;
  margin-top: 1rem;
}

.paper-figure {
  margin: 0;
}

.figure-image-link,
.paper-figure img {
  display: block;
  width: 100%;
}

.figure-image-link {
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: rgba(252, 251, 248, 0.76);
}

.paper-figure:not(.single-figure) > img,
.paper-figure:not(.single-figure) .figure-image-link img,
.single-figure img {
  width: 100%;
  height: auto;
}

.paper-figure figcaption {
  margin-top: 0.7rem;
}

.two-figure-grid .paper-figure figcaption {
  text-align: center;
}

.single-figure {
  margin-top: 1rem;
}

.single-figure img {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(252, 251, 248, 0.76);
}

.video-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.2rem;
}

.task-tab {
  min-height: 2.7rem;
  padding: 0.62rem 1rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(252, 251, 248, 0.76);
  color: var(--text);
  font: inherit;
  font-size: 0.98rem;
  font-weight: 500;
}

.task-tab.is-active {
  background: var(--text);
  border-color: var(--text);
  color: #ffffff;
}

.task-panel {
  margin-top: 1.4rem;
}

.task-panel[hidden] {
  display: none !important;
}

.task-summary {
  max-width: 54rem;
}

.comparison-grid {
  margin-top: 1rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.4rem;
}

.comparison-grid.push-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1rem;
}

.comparison-grid.rollout-video-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.1rem;
}

.comparison-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  overflow: hidden;
  background: rgba(252, 251, 248, 0.76);
}

.comparison-label {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.65rem 0.8rem;
  background: rgba(33, 70, 111, 0.05);
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  text-align: center;
}

.comparison-label.is-ours {
  color: var(--text);
  font-weight: 800;
}

.comparison-card video {
  display: block;
  width: 100%;
  aspect-ratio: 1 / 1;
  background: #000000;
}

.citation-section {
  padding: 0 0 5.5rem;
  scroll-margin-top: 5.75rem;
}

.bibtex-block {
  margin: 0;
  padding: 1.35rem 1.5rem;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(252, 251, 248, 0.76);
  color: var(--text);
  overflow-x: auto;
  font-size: 0.95rem;
  line-height: 1.7;
  text-align: left;
}

.bibtex-block code {
  font-family: "SFMono-Regular", "SF Mono", Consolas, "Liberation Mono", Menlo, monospace;
  white-space: pre-wrap;
  word-break: break-word;
}

.rollout-video-grid .comparison-card video {
  aspect-ratio: 1 / 1;
  object-fit: contain;
}

@media (max-width: 980px) {
  .hero {
    padding-top: 5rem;
  }

  .two-figure-grid,
  .strengths-grid {
    grid-template-columns: 1fr;
    gap: 1.6rem;
  }

  .intro-body {
    max-width: none;
  }

  .comparison-grid.push-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .comparison-grid.rollout-video-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .container {
    width: min(calc(100% - 1.5rem), var(--max-width));
  }

  .header-inner {
    min-height: 4rem;
  }

  .section-nav {
    gap: 1rem;
    font-size: 0.9rem;
  }

  .hero {
    padding: 4rem 0 3rem;
  }

  h1 {
    font-size: clamp(2.55rem, 10vw, 3.7rem);
  }

  .hero-copy,
  .section-copy,
  .intro-lead,
  .intro-body p,
  .strength-item p,
  .results-copy p,
  .artifact-caption,
  .task-summary,
  .metrics-table,
  .paper-figure figcaption {
    font-size: 1rem;
    line-height: 1.8;
  }

  .authors {
    font-size: 1.15rem;
  }

  .affiliation-list p {
    font-size: 1rem;
  }

  .author-notes {
    flex-direction: column;
    gap: 0.35rem;
  }

  .project-button {
    width: 100%;
    justify-content: center;
  }

  .overview-frame {
    width: min(calc(100% - 1.5rem), var(--max-width));
    padding: 0.8rem;
  }

  .comparison-grid {
    grid-template-columns: 1fr;
  }

  .comparison-grid.push-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .comparison-grid.rollout-video-grid {
    grid-template-columns: 1fr;
  }

  .comparison-label {
    justify-content: flex-start;
    padding: 0.65rem 0.8rem;
  }

  .overview-section,
  .abstract-section,
  .strengths-section,
  .experiments-section,
  .citation-section {
    padding-bottom: 4rem;
  }
}