:root {
  --ink: #0f172a;
  --ink-soft: #334155;
  --muted: #64748b;
  --line: #e2e8f0;
  --surface: #ffffff;
  --surface-soft: #f8fafc;
  --cyan: #0891b2;
  --cyan-bright: #22d3ee;
  --blue: #2563eb;
  --green: #16a34a;
  --green-bright: #34d399;
  --amber: #d97706;
  --radius: 16px;
  --shadow: 0 18px 45px rgba(15, 23, 42, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 2.75rem;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--surface);
  font-family: "Google Sans", "Noto Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--blue);
}

a:focus-visible,
summary:focus-visible,
video:focus-visible {
  outline: 3px solid rgba(8, 145, 178, 0.35);
  outline-offset: 4px;
}

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

.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 1000;
  padding: 0.65rem 0.9rem;
  color: #fff;
  background: var(--ink);
  border-radius: 8px;
  transform: translateY(-150%);
  transition: transform 0.2s ease;
}

.skip-link:focus {
  color: #fff;
  transform: translateY(0);
}

.project-container {
  width: min(1120px, calc(100% - 3rem));
  margin-inline: auto;
}

.prose-narrow {
  max-width: 860px;
}

/* Sticky in-page navigation */
.project-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  width: 100%;
  background: rgba(255, 255, 255, 0.93);
  border-bottom: 1px solid var(--line);
  box-shadow: 0 4px 16px rgba(15, 23, 42, 0.025);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.project-nav-inner {
  display: flex;
  justify-content: center;
  gap: 0.6rem;
  width: 100%;
  padding: 0.72rem 0.25rem;
  overflow-x: auto;
  scrollbar-width: none;
  white-space: nowrap;
}

.project-nav-inner::-webkit-scrollbar {
  display: none;
}

.project-nav-inner a {
  display: inline-flex;
  align-items: center;
  gap: 0.32rem;
  color: #475569;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  transition: color 0.2s ease;
}

.project-nav-inner a:hover {
  color: var(--cyan);
}

.nav-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.28rem;
  height: 1.28rem;
  color: #0e7490;
  background: #ecfeff;
  border: 1px solid #a5f3fc;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 700;
  line-height: 1;
}

.nav-row-break {
  display: none;
}

/* Publication header */
.publication-header {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle at 18% 10%, rgba(34, 211, 238, 0.075), transparent 25%),
    radial-gradient(circle at 84% 22%, rgba(52, 211, 153, 0.07), transparent 25%),
    #fff;
}

.publication-header-inner {
  padding-block: clamp(2.6rem, 4.5vw, 3.75rem) 1.75rem;
  text-align: center;
}

.publication-title {
  max-width: 1080px;
  margin: 0 auto;
  color: var(--ink);
  font-family: "Google Sans", "Noto Sans", sans-serif;
  font-size: clamp(2rem, 3.6vw, 3rem);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.035em;
  text-wrap: balance;
}

.gdpo-title {
  color: transparent;
  background: linear-gradient(90deg, #7f1d1d 0%, #c2410c 35%, #e11d48 68%, #d97706 100%);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 800;
  letter-spacing: -0.025em;
}

.publication-authors {
  max-width: 980px;
  margin: 1.75rem auto 0;
  font-size: clamp(1rem, 1.8vw, 1.24rem);
  line-height: 1.7;
}

.publication-authors a {
  color: #0b8ee8;
}

.publication-authors a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.author-block {
  display: inline-block;
}

.publication-authors sup,
.publication-affiliation sup {
  position: relative;
  top: -0.35em;
  font-size: 0.68em;
}

.publication-affiliation {
  margin: 0.25rem auto 0;
  color: #475569;
  font-size: 1rem;
}

.publication-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.55rem;
  margin-top: 1.4rem;
}

.project-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  min-height: 2.55rem;
  padding: 0.58rem 1.05rem;
  color: #fff;
  background: #2f2f2f;
  border: 1px solid #2f2f2f;
  border-radius: 999px;
  font-size: 0.96rem;
  font-weight: 600;
  transition: transform 0.2s ease, background-color 0.2s ease, box-shadow 0.2s ease;
}

.project-button:hover {
  color: #fff;
  background: var(--ink);
  box-shadow: 0 8px 20px rgba(15, 23, 42, 0.2);
  transform: translateY(-1px);
}

.project-button.is-disabled {
  color: #cbd5e1;
  background: #475569;
  border-color: #475569;
  cursor: not-allowed;
}

/* Teaser */
.teaser-section {
  padding: 0 0 0.75rem;
}

.video-figure {
  margin: 0;
}

.video-frame {
  max-width: 1080px;
  margin-inline: auto;
  overflow: hidden;
  background: #0f172a;
  border: 1px solid var(--line);
  border-radius: 18px;
  box-shadow: var(--shadow);
}

.video-frame video {
  width: 100%;
  aspect-ratio: 31 / 18;
  background: #fff;
  object-fit: contain;
}

.teaser-summary {
  max-width: 980px;
  margin: 1rem auto 0;
  color: var(--ink-soft);
  font-size: clamp(1.05rem, 2vw, 1.28rem);
  line-height: 1.5;
  text-align: center;
  text-wrap: balance;
}

.teaser-summary strong {
  color: var(--ink);
}

/* Content sections */
.paper-section {
  padding: 2rem 0;
}

#abstract {
  padding-bottom: 1.25rem;
}

#overview {
  padding-top: 1.25rem;
  padding-bottom: 1.25rem;
}

#method {
  padding-top: 1.25rem;
}

.section-soft {
  background: var(--surface-soft);
}

.section-heading {
  margin-bottom: 1rem;
}

.section-heading.is-centered {
  text-align: center;
}

.section-title-accent {
  position: relative;
  display: inline-block;
  margin: 0 0 1rem;
  padding-bottom: 0.48rem;
  color: var(--ink);
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.025em;
}

.section-title-accent::after {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--cyan-bright), var(--green-bright));
  border-radius: 999px;
  content: "";
}

.overview-summary {
  margin: 0.8rem 0 0;
  color: #475569;
  font-size: 1rem;
  line-height: 1.55;
}

.paper-copy {
  color: var(--ink-soft);
  font-family: "Noto Sans", sans-serif;
  font-size: 1.02rem;
  line-height: 1.8;
}

.paper-copy p:not(:last-child) {
  margin-bottom: 1.05rem;
}

.paper-copy strong {
  color: var(--ink);
}

.figure-block {
  margin: 0.75rem auto 0;
}

.figure-surface {
  padding: clamp(0.45rem, 1.5vw, 1rem);
  overflow: hidden;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: 0 12px 32px rgba(15, 23, 42, 0.055);
}

.figure-surface img {
  width: 100%;
  height: auto;
  margin-inline: auto;
  object-fit: contain;
}

.figure-surface.is-method {
  padding: 1.4rem clamp(0.35rem, 0.8vw, 0.6rem);
}

.figure-surface.is-method img {
  width: 90%;
  max-width: none;
}

.method-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.5rem;
}

.method-card {
  padding: 1.35rem 1.4rem 1.45rem;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.04);
}

.method-step {
  display: inline-flex;
  padding: 0.24rem 0.6rem;
  color: #0e7490;
  background: #ecfeff;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.method-step.is-green {
  color: #15803d;
  background: #f0fdf4;
}

.method-card h3 {
  margin: 0.65rem 0 0.45rem;
  color: var(--ink);
  font-size: 1.2rem;
  font-weight: 700;
}

.method-card p {
  margin: 0;
  color: #475569;
  font-family: "Noto Sans", sans-serif;
  font-size: 0.94rem;
  line-height: 1.68;
}

/* Video comparisons */
.comparison-lead {
  max-width: 1040px;
  margin: 0.75rem 0 0;
  color: #475569;
  font-size: 1rem;
  line-height: 1.55;
}

.comparison-legend {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  margin: 0.35rem 0 2rem;
}

.legend-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.38rem;
  padding: 0.32rem 0.68rem;
  color: #475569;
  background: #f1f5f9;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 600;
  line-height: 1;
}

.legend-swatch {
  width: 0.68rem;
  height: 0.68rem;
  background: #f8fafc;
  border: 1px solid #cbd5e1;
  border-radius: 3px;
}

.legend-swatch.is-gt {
  background: #fef3c7;
  border-color: #f59e0b;
}

.legend-swatch.is-ours {
  background: #06b6d4;
  border-color: #06b6d4;
}

.comparison-carousel {
  position: relative;
  width: 100%;
  max-width: none;
  margin: 0.25rem auto 0;
  overflow: hidden;
}

.comparison-carousel:focus-visible {
  outline: 3px solid rgba(8, 145, 178, 0.32);
  outline-offset: 7px;
}

.comparison-item {
  margin: 0;
  padding: 0 0 36px;
  font-size: 0;
}

.model-strip {
  width: 100%;
  max-width: none;
  margin: 0 auto;
}

.model-strip-labels {
  display: flex;
  width: 100%;
  margin-bottom: 0.4rem;
  gap: 4px;
}

.model-strip-labels > span {
  flex: 1 1 0;
  padding: 0.35rem 0.2rem;
  color: #1e293b;
  background: #f1f5f9;
  border-radius: 6px;
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.2px;
  line-height: 1.5;
  text-align: center;
}

.model-strip-labels > span.is-gt {
  color: #78350f;
  background: #fef3c7;
}

.model-strip-labels > span.is-ours {
  color: #fff;
  background: linear-gradient(90deg, #06b6d4 0%, #22d3ee 100%);
  box-shadow: 0 1px 6px rgba(6, 182, 212, 0.25);
}

.comparison-stage {
  overflow: hidden;
  background: #000;
  border-radius: 6px;
}

.comparison-video {
  display: block;
  width: 100%;
  aspect-ratio: 5 / 1;
  background: #000;
  border-radius: 6px;
  object-fit: contain;
}

.carousel-arrow {
  position: absolute;
  top: 50%;
  z-index: 3;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  min-width: 42px;
  height: 42px;
  padding: 0;
  color: #0f172a;
  background: #fff;
  border: 1px solid #fff;
  border-radius: 999999px;
  box-shadow: 0 2px 5px rgba(50, 50, 50, 0.1);
  cursor: pointer;
  margin-top: -20px;
  transition: opacity 0.2s ease;
}

.carousel-arrow.is-previous {
  left: 0;
}

.carousel-arrow.is-next {
  right: 0;
}

.carousel-arrow svg {
  display: block;
  width: 10px;
  height: 16px;
}

.carousel-arrow:hover {
  color: #0f172a;
  opacity: 0.8;
}

.carousel-arrow:active {
  opacity: 0.65;
}

.carousel-arrow:focus-visible {
  outline: 3px solid rgba(8, 145, 178, 0.3);
  outline-offset: 3px;
}

.carousel-pagination {
  position: absolute;
  right: 0;
  bottom: 0;
  left: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 34px;
  padding: 4px 16px;
}

.carousel-page {
  display: flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 10px;
  width: 10px;
  min-width: 10px;
  height: 10px;
  margin: 0 3px;
  padding: 0;
  color: transparent;
  background: #000;
  border: 0;
  border-radius: 999999px;
  box-shadow: 0 2px 5px rgba(50, 50, 50, 0.1);
  cursor: pointer;
  font-size: 0;
  line-height: 1;
  transition: background 0.2s ease, color 0.2s ease;
}

.carousel-page:hover {
  background: #000;
}

.carousel-page:focus-visible {
  outline: 3px solid rgba(8, 145, 178, 0.3);
  outline-offset: 3px;
}

.carousel-page.is-active {
  flex-basis: auto;
  width: auto;
  min-width: 26px;
  height: 26px;
  padding: 0 8px;
  color: #fff;
  background: linear-gradient(90deg, #06b6d4 0%, #22d3ee 100%);
  font-size: 0.82rem;
  font-weight: 700;
}

/* Text-controlled emotion examples */
.text-control-carousel {
  width: 85%;
}

.text-control-legend {
  margin: 0 0 0.85rem;
}

.text-control-label-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 6px 4px;
  width: 100%;
  margin-bottom: 0.65rem;
}

.text-control-label-grid > * {
  display: flex;
  align-items: center;
  min-width: 0;
  margin: 0;
  border-radius: 6px;
  line-height: 1.35;
}

.text-control-label-grid > .is-gt {
  justify-content: center;
  min-width: 0;
  padding: 0.65rem 0.3rem;
  color: #78350f;
  background: #fef3c7;
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.2px;
  text-align: center;
}

.text-control-label-grid > .is-prompt {
  position: relative;
  display: block;
  padding: 0.65rem 0.75rem;
  color: #164e63;
  background: #ecfeff;
  border: 1px solid #a5f3fc;
  border-left: 4px solid #06b6d4;
  font-size: 0.9rem;
  font-style: italic;
  font-weight: 400;
  letter-spacing: 0.05px;
  text-align: left;
}

.text-control-label-grid > .is-prompt::before,
.text-control-label-grid > .is-prompt::after {
  color: #0891b2;
  font-size: 1.1em;
  font-weight: 400;
}

.text-control-label-grid > .is-prompt strong {
  color: inherit;
  font-style: inherit;
  font-weight: 700;
}

.text-control-stage {
  position: relative;
  overflow: hidden;
  background: #000;
  border-radius: 6px;
}

.text-control-video {
  display: block;
  width: 100%;
  aspect-ratio: 3 / 2;
  background: #000;
  border-radius: 6px;
  object-fit: contain;
}

.text-control-carousel .carousel-arrow {
  top: 50%;
}

/* Expressiveness control */
.expressiveness-carousel {
  width: 90%;
}

.expressiveness-video {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 1;
  background: #000;
  border-radius: 6px;
  object-fit: contain;
}

.expressiveness-labels > span.is-control {
  color: #164e63;
  background: #ecfeff;
  border: 1px solid #a5f3fc;
  border-left: 4px solid #06b6d4;
  box-shadow: none;
  font-style: normal;
  font-weight: 400;
}

.expressiveness-labels > span.is-control strong {
  color: #0e7490;
  font-weight: 700;
}

/* Long-sequence comparison */
.long-sequence-content {
  width: 100%;
  margin: 0.25rem auto 0;
}

.long-sequence-video {
  display: block;
  width: 100%;
  aspect-ratio: 5 / 1;
  background: #000;
  border-radius: 6px;
  object-fit: contain;
}

/* Gaussian-avatar integration */
#gaussian-avatar-integration .comparison-legend {
  margin-bottom: 1.5rem;
}

.gaussian-avatar-subsection + .gaussian-avatar-subsection {
  margin-top: 2.5rem;
}

.gaussian-avatar-subtitle {
  margin: 0 0 0.9rem;
  color: var(--ink);
  font-size: clamp(1.3rem, 2.2vw, 1.6rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.015em;
}

.gaussian-avatar-video {
  display: block;
  width: 100%;
  aspect-ratio: 5 / 3;
  background: #000;
  border-radius: 6px;
  object-fit: contain;
}

/* Footer */
.page-footer {
  padding: 2.25rem 0;
  color: #64748b;
  background: #f1f5f9;
  border-top: 1px solid var(--line);
}

.footer-inner {
  max-width: 820px;
  font-family: "Noto Sans", sans-serif;
  font-size: 0.88rem;
  line-height: 1.7;
  text-align: center;
}

.footer-inner p {
  margin: 0;
}

.footer-inner p + p {
  margin-top: 0.4rem;
}

.footer-inner a {
  color: #0e7490;
}

.footer-inner a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

@media screen and (min-width: 769px) and (max-width: 1250px) {
  html {
    scroll-padding-top: 4.75rem;
  }

  .project-nav-inner {
    flex-wrap: wrap;
    gap: 0.45rem 1rem;
    padding-block: 0.58rem;
    overflow-x: visible;
  }

  .nav-row-break {
    display: block;
    flex-basis: 100%;
    width: 0;
    height: 0;
  }
}

@media screen and (max-width: 768px) {
  html {
    scroll-padding-top: 3rem;
  }

  .project-container {
    width: min(100% - 2rem, 1120px);
  }

  .project-nav-inner {
    justify-content: flex-start;
    gap: 1rem;
    padding-inline: 1rem;
    font-size: 0.85rem;
  }

  .publication-header-inner {
    padding-top: 2.8rem;
  }

  .publication-title {
    font-size: clamp(1.8rem, 8.3vw, 2.45rem);
    line-height: 1.12;
  }

  .publication-authors {
    margin-top: 1.35rem;
    line-height: 1.65;
  }

  .publication-affiliation {
    max-width: 26rem;
    font-size: 0.92rem;
  }

  .video-frame,
  .figure-surface {
    border-radius: 12px;
  }

  .paper-copy {
    text-align: left;
  }

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

  .comparison-lead {
    font-size: 0.92rem;
    line-height: 1.5;
  }

  .comparison-legend {
    gap: 0.35rem;
    margin-bottom: 1.3rem;
  }

  .legend-chip {
    gap: 0.3rem;
    padding: 0.28rem 0.52rem;
    font-size: 0.7rem;
  }

  .legend-swatch {
    width: 0.58rem;
    height: 0.58rem;
  }

  .text-control-carousel {
    width: 100%;
  }

  .expressiveness-carousel {
    width: 100%;
  }

  .long-sequence-content {
    width: 100%;
  }

  .model-strip-labels > span {
    padding-inline: 0.08rem;
    font-size: clamp(0.56rem, 2.15vw, 0.78rem);
    letter-spacing: 0;
    overflow-wrap: anywhere;
  }

  .text-control-label-grid > .is-gt,
  .text-control-label-grid > .is-prompt {
    padding: 0.48rem 0.38rem;
    font-size: clamp(0.6rem, 2.45vw, 0.76rem);
    letter-spacing: 0;
    overflow-wrap: anywhere;
  }

}

@media screen and (max-width: 480px) {
  .publication-links {
    align-items: stretch;
    flex-direction: column;
  }

  .project-button {
    width: 100%;
  }

  .paper-section {
    padding-block: 1.75rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}