:root {
  --color-paper: #ffffff;
  --color-surface: #f7f9fb;
  --color-ink: #17242d;
  --color-muted: #64727a;
  --color-line: #dce3e8;
  --color-teal: #256f70;
  --color-rust: #975237;
  --content-width: 1120px;
  --radius-large: 16px;
  color-scheme: light;
  font-family: Arial, Helvetica, sans-serif;
  background: var(--color-paper);
  color: var(--color-ink);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  margin: 0;
  background: var(--color-paper);
}

a {
  color: inherit;
}

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button {
  font: inherit;
}

:focus-visible {
  outline: 3px solid var(--color-teal);
  outline-offset: 4px;
}

[hidden] {
  display: none !important;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: -80px;
  left: 18px;
  z-index: 30;
  min-height: 48px;
  padding: 11px 15px;
  display: inline-flex;
  align-items: center;
  color: #fff;
  background: var(--color-ink);
  border-radius: 8px;
}

.skip-link:focus {
  top: 18px;
}

.site-header {
  max-width: var(--content-width);
  min-height: 68px;
  margin: 0 auto;
  padding: 0 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--color-line);
}

.wordmark {
  min-height: 48px;
  display: inline-flex;
  align-items: center;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-decoration: none;
}

.site-header nav {
  display: flex;
  gap: 8px;
}

.site-header nav a {
  min-height: 48px;
  padding: 0 10px;
  display: inline-flex;
  align-items: center;
  color: var(--color-muted);
  font-size: 0.78rem;
  text-decoration: none;
}

.site-header nav a:hover {
  color: var(--color-teal);
}

.hero {
  max-width: 1120px;
  margin: 0 auto;
  padding: 54px 28px 34px;
  text-align: center;
}

.publication-logo {
  display: block;
  width: 56px;
  height: 56px;
  margin: 0 auto 24px;
}

.hero h1 {
  max-width: 1000px;
  margin: 0 auto;
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.025em;
  text-wrap: balance;
}

.project-name {
  color: #467895;
  font-weight: 700;
}

.publication-links {
  max-width: 1040px;
  margin: 30px auto 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
}

.publication-link {
  min-height: 48px;
  padding: 10px 14px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #fff;
  background: var(--color-ink);
  border: 1px solid var(--color-ink);
  border-radius: 999px;
  font-size: 0.84rem;
  font-weight: 700;
  text-decoration: none;
  transition:
    transform 160ms ease,
    background 160ms ease;
}

.publication-link svg {
  width: 18px;
  height: 18px;
  flex: 0 0 18px;
  fill: currentcolor;
}

.publication-link small {
  display: inline-flex;
  align-items: center;
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.publication-link small::before {
  margin-right: 7px;
  content: "·";
}

.publication-link:not(.is-coming-soon):hover {
  transform: translateY(-2px);
  background: var(--color-teal);
  border-color: var(--color-teal);
}

.publication-link.is-coming-soon {
  color: #58666e;
  background: #eef2f5;
  border-color: var(--color-line);
  cursor: default;
  pointer-events: none;
}

.preview-section {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 28px 62px;
  text-align: center;
}

.video-sound-note {
  margin: 0 0 16px;
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--color-muted);
}

.name-origin {
  max-width: 820px;
  margin: 22px auto 0;
  color: var(--color-muted);
  font-size: 0.95rem;
  line-height: 1.8;
  text-wrap: pretty;
}

.video-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: #22343b;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-large);
  box-shadow: 0 24px 70px rgb(23 36 45 / 17%);
}

.video-frame > img,
.video-frame > video,
.video-frame > iframe {
  width: 100%;
  height: 100%;
  display: block;
  border: 0;
  object-fit: cover;
}

.video-coming-soon {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  gap: 8px;
  color: #fff;
  background: rgb(16 29 34 / 47%);
}

.video-coming-soon span {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.video-coming-soon strong {
  font-size: clamp(1.9rem, 5vw, 3.8rem);
  font-weight: 400;
}

.tagline {
  margin: 40px auto 0;
  font-size: clamp(1.45rem, 3vw, 2.2rem);
  line-height: 1.45;
}

.tagline span {
  color: var(--color-teal);
}

.research-section {
  padding: 64px 28px;
  border-top: 1px solid var(--color-line);
  scroll-margin-top: 24px;
}

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

.section-content {
  max-width: 1064px;
  margin: 0 auto;
}

.centered,
.section-title,
.section-intro {
  text-align: center;
}

.section-title {
  margin: 0 0 22px;
  font-size: clamp(1.75rem, 3.4vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.2;
  text-wrap: balance;
}

.section-intro {
  max-width: 760px;
  margin: 0 auto 32px;
  color: var(--color-muted);
  line-height: 1.7;
}

.paper-copy {
  max-width: 860px;
  margin: 28px auto 0;
  line-height: 1.85;
}

.paper-copy p + p {
  margin-top: 20px;
}

.research-figure {
  margin: 32px 0;
}

.research-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 12px;
  background: white;
}

.research-figure figcaption {
  margin: 16px auto 0;
  max-width: 900px;
  font-size: 0.88rem;
  color: var(--color-muted);
  line-height: 1.7;
}

.method-steps,
.capability-highlights {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 28px;
  margin-top: 36px;
}

.method-steps article,
.capability-highlights article {
  padding-top: 18px;
  border-top: 2px solid var(--color-teal);
  line-height: 1.75;
}

.step-label,
.highlight-value {
  margin: 0 0 12px;
  color: var(--color-teal);
  font-weight: 700;
}

.highlight-value {
  font-size: 1.5rem;
}

.card-title {
  margin: 0 0 12px;
  font-size: 1.12rem;
  line-height: 1.4;
}

.interactive-demo-card {
  max-width: 800px;
  margin: 0 auto;
  line-height: 1.8;
}

.demo-scene-preview {
  margin: 0 auto 24px;
  overflow: hidden;
  aspect-ratio: 20 / 9;
  border-radius: 12px;
  background: #eef2f5;
}

.demo-scene-preview img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

@media (max-width: 720px) {
  .demo-scene-preview {
    aspect-ratio: 16 / 9;
    margin-bottom: 20px;
    border-radius: 9px;
  }
}

.demo-launch {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-height: 48px;
  margin: 16px 0;
  padding: 12px 24px;
  color: white;
  background: var(--color-teal);
  border-radius: 999px;
  text-decoration: none;
  font-weight: 700;
}

.demo-launch:hover {
  background: var(--color-ink);
}

.demo-launch-note {
  color: var(--color-muted);
  font-size: 0.85rem;
}

@media (max-width: 720px) {
  .research-section {
    padding: 42px 20px;
  }

  .method-steps,
  .capability-highlights {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .site-header {
    flex-wrap: wrap;
    gap: 0 12px;
  }

  .site-header nav {
    flex-wrap: wrap;
    gap: 0;
  }
}

footer {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 38px 28px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  justify-items: center;
  text-align: center;
  gap: 16px;
}

footer > strong {
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

footer > p {
  grid-column: 1 / -1;
  margin: 4px 0 0;
  color: var(--color-muted);
  font-size: 0.75rem;
}

.contact-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
}

.contact-actions button,
.contact-actions a {
  min-height: 48px;
  padding: 9px 15px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--color-ink);
  background: transparent;
  border: 1px solid var(--color-line);
  border-radius: 999px;
  cursor: pointer;
  font-size: 0.84rem;
  font-weight: 700;
  text-decoration: none;
  transition:
    color 160ms ease,
    border-color 160ms ease,
    transform 160ms ease;
}

.contact-actions button:hover,
.contact-actions a:hover {
  color: var(--color-teal);
  border-color: var(--color-teal);
  transform: translateY(-2px);
}

.contact-actions svg {
  width: 18px;
  height: 18px;
  flex: 0 0 18px;
  fill: currentcolor;
}

.contact-dialog {
  width: min(92vw, 420px);
  padding: 26px;
  color: var(--color-ink);
  background: var(--color-paper);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-large);
}

.contact-dialog::backdrop {
  background: rgb(12 24 30 / 58%);
}

.contact-dialog h2 {
  margin: 0 0 16px;
  font-weight: 400;
}

.email-address {
  margin: 0 0 16px;
  padding: 13px 15px;
  overflow-wrap: anywhere;
  color: var(--color-ink);
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: 10px;
  font-size: 0.95rem;
  user-select: all;
}

.copy-email {
  min-height: 44px;
  padding: 9px 15px;
  color: #fff;
  background: var(--color-ink);
  border: 1px solid var(--color-ink);
  border-radius: 999px;
  cursor: pointer;
  font-size: 0.84rem;
  font-weight: 700;
}

.copy-email:hover {
  background: var(--color-teal);
  border-color: var(--color-teal);
}

.copy-status {
  min-height: 1.25em;
  margin: 10px 0 0;
  color: var(--color-muted);
  font-size: 0.78rem;
}

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

.dialog-close {
  min-width: 48px;
  min-height: 48px;
  float: right;
  color: var(--color-ink);
  background: transparent;
  border: 0;
  cursor: pointer;
  font-size: 1.6rem;
}

@media (max-width: 720px) {
  .site-header {
    padding-inline: 20px;
  }

  .site-header nav {
    gap: 0;
  }

  .hero {
    padding: 60px 20px 32px;
  }

  .preview-section {
    padding-inline: 16px;
  }

  footer {
    padding-inline: 20px;
    align-items: start;
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 420px) {
  .site-header nav a {
    padding-inline: 7px;
  }
}

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

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

.gamepad-icon,
.publication-link .gamepad-icon {
  width: 22px;
  height: 22px;
  flex: 0 0 22px;
  fill: none;
}

@media (max-width: 900px) {
  .publication-links {
    gap: 6px;
  }

  .publication-link {
    padding: 9px 10px;
    gap: 6px;
    font-size: 0.8rem;
  }

  .publication-link svg,
  .publication-link .gamepad-icon {
    width: 18px;
    height: 18px;
    flex-basis: 18px;
  }
}

.citation-block {
  margin: 28px 0 16px;
  padding: 24px;
  border: 1px solid var(--color-line);
  border-radius: 12px;
  background: var(--color-surface);
  font: inherit;
  font-size: 0.9rem;
  line-height: 1.8;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.citation-block code {
  font-family: ui-monospace, "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.88em;
}

.citation-download {
  text-align: center;
}

.citation-download a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--color-teal);
}

.citation-container {
  position: relative;
  margin-top: 28px;
}
.citation-container .citation-block {
  margin-top: 0;
  padding-top: 58px;
}
.citation-copy {
  position: absolute;
  top: 12px;
  right: 14px;
  padding: 5px 12px;
  border: 1px solid var(--color-line);
  border-radius: 6px;
  background: var(--color-surface);
  color: var(--color-teal);
  font: inherit;
  font-size: 0.8rem;
  cursor: pointer;
}
.citation-copy:hover {
  background: white;
}
.citation-copy:focus-visible {
  outline: 2px solid var(--color-teal);
  outline-offset: 3px;
}

.publication-authors {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px 20px;
  max-width: 940px;
  margin: 28px auto 16px;
  font-size: 1.08rem;
  line-height: 1.6;
}

.publication-authors span {
  white-space: nowrap;
}

.publication-authors sup,
.publication-affiliations sup {
  margin-left: 2px;
  color: var(--color-teal);
  font-size: 0.72em;
}

.publication-affiliations {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px 20px;
  max-width: 940px;
  margin: 0 auto;
  color: var(--color-muted);
  font-size: 0.9rem;
  line-height: 1.6;
}

.publication-affiliations sup {
  margin: 0 4px 0 0;
}

.author-note {
  margin: 12px 0 0;
  color: var(--color-muted);
  font-size: 0.8rem;
  line-height: 1.6;
}

.institution-logos {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 24px 40px;
  margin: 26px auto 0;
}

.institution-logos img {
  display: block;
  object-fit: contain;
}

@media (max-width: 600px) {
  .publication-authors {
    gap: 6px 14px;
    font-size: 1rem;
  }

  .institution-logos {
    gap: 18px;
  }

  .institution-logos img {
    width: 58px;
    height: 58px;
  }

  .institution-logos .gamma-logo {
    width: 150px;
    height: 52px;
  }
}

.publication-authors,
.publication-affiliations {
  display: block;
}

.author-row,
.affiliation-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px 20px;
}

.author-row + .author-row {
  margin-top: 10px;
}

.affiliation-row + .affiliation-row {
  margin-top: 8px;
}

.publication-authors a {
  color: inherit;
  text-decoration: none;
}

.publication-authors a:hover {
  color: var(--color-teal);
  text-decoration: underline;
  text-underline-offset: 4px;
}

@media (max-width: 600px) {
  .institution-logos {
    gap: 14px;
  }
  .institution-logos img {
    width: 66px;
    height: 66px;
  }
  .institution-logos .gamma-logo {
    width: 168px;
    height: 58px;
  }
  .author-row {
    gap: 6px 14px;
  }
}

.video-alternative {
  text-align: right;
  margin: 8px 0 0;
  color: var(--color-muted);
  font-size: 0.9rem;
}
.video-alternative a {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  color: var(--color-teal);
}
.video-play-status {
  text-align: right;
  color: var(--color-muted);
  font-size: 0.9rem;
}
.video-play-status:empty {
  display: none;
}

#citation .section-title,
#citation .citation-block {
  text-align: left;
}

/* Experiment gallery */
.gallery-eyebrow {
  margin: 0 0 14px;
  color: var(--color-teal);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-align: center;
}

.gallery-filters {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin: 0 0 30px;
}

.gallery-filters button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 16px;
  border: 1px solid var(--color-line);
  border-radius: 999px;
  background: var(--color-paper);
  color: var(--color-ink);
  font-size: 0.84rem;
  cursor: pointer;
}

.gallery-filters button span {
  font-size: 0.72rem;
  opacity: 0.7;
}

.gallery-filters button:hover {
  border-color: var(--color-teal);
}
.gallery-filters button[aria-pressed="true"] {
  color: #fff;
  background: var(--color-teal);
  border-color: var(--color-teal);
}

.gallery-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border-top: 1px solid var(--color-line);
  padding-top: 14px;
}

.gallery-summary {
  margin: 0;
  font-size: 0.85rem;
  font-weight: 700;
}

.gallery-preview-toggle {
  min-height: 44px;
  padding: 8px 0 8px 12px;
  border: 0;
  background: transparent;
  color: var(--color-teal);
  font-size: 0.8rem;
  text-decoration: underline;
  text-underline-offset: 3px;
  cursor: pointer;
}

.gallery-description {
  margin: 0 0 20px;
  color: var(--color-muted);
  font-size: 0.86rem;
  line-height: 1.6;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px 18px;
}

.gallery-card {
  overflow: hidden;
  border: 1px solid var(--color-line);
  border-radius: 12px;
  background: var(--color-paper);
}

.gallery-clip {
  display: block;
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  padding: 0;
  overflow: hidden;
  border: 0;
  background: #18232b;
  color: #fff;
  cursor: pointer;
}

.gallery-clip:focus-visible {
  outline-offset: -4px;
}
.gallery-clip video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  pointer-events: none;
}

.gallery-play,
.gallery-duration {
  position: absolute;
  bottom: 10px;
  padding: 5px 8px;
  border-radius: 5px;
  background: rgb(10 20 28 / 80%);
  font-size: 0.72rem;
  line-height: 1.2;
  pointer-events: none;
}

.gallery-play {
  left: 10px;
}
.gallery-duration {
  right: 10px;
  font-variant-numeric: tabular-nums;
}
.gallery-clip:hover .gallery-play {
  background: var(--color-teal);
}
.gallery-card-copy {
  padding: 15px 16px 18px;
}
.gallery-tags {
  margin: 0 0 7px;
  color: var(--color-teal);
  font-size: 0.7rem;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: 0.025em;
}

.gallery-card h3 {
  margin: 0;
  font-size: 0.96rem;
  font-weight: 600;
  line-height: 1.45;
}

.gallery-footnote,
.gallery-fallback {
  margin: 24px 0 0;
  color: var(--color-muted);
  font-size: 0.78rem;
  line-height: 1.6;
  text-align: center;
}

.gallery-player-open {
  overflow: hidden;
}
.gallery-dialog {
  width: min(1080px, calc(100% - 32px));
  max-height: calc(100dvh - 32px);
  padding: 0;
  overflow: auto;
  border: 1px solid var(--color-line);
  border-radius: 14px;
  color: var(--color-ink);
  background: var(--color-paper);
}

.gallery-dialog::backdrop {
  background: rgb(8 17 24 / 80%);
}
.gallery-dialog-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 18px 22px;
}

.gallery-dialog h2 {
  margin: 0;
  font-size: 1.1rem;
  line-height: 1.4;
}
.gallery-dialog-header p {
  margin: 5px 0 0;
  color: var(--color-muted);
  font-size: 0.8rem;
}
.gallery-close {
  flex: 0 0 44px;
  height: 44px;
  border: 1px solid var(--color-line);
  border-radius: 50%;
  background: var(--color-surface);
  color: var(--color-ink);
  cursor: pointer;
}

.gallery-dialog video {
  display: block;
  width: 100%;
  max-height: 70dvh;
  aspect-ratio: 16 / 9;
  background: #111;
}

.gallery-player-fallback {
  margin: 14px 22px;
  font-size: 0.78rem;
  color: var(--color-muted);
}

@media (max-width: 900px) {
  .gallery-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .site-header {
    flex-wrap: wrap;
  }
  .site-header nav {
    flex-wrap: wrap;
  }
}

@media (max-width: 540px) {
  .gallery-grid {
    grid-template-columns: minmax(0, 1fr);
  }
  .gallery-filters {
    gap: 6px;
    justify-content: flex-start;
  }
  .gallery-filters button {
    padding: 9px 12px;
    font-size: 0.78rem;
  }
  .gallery-dialog-header {
    padding: 14px;
  }
  .gallery-dialog h2 {
    font-size: 0.96rem;
  }
}