/*
 * SplatAnything — minimal light theme.
 * Palette follows a zinc scale: white canvas, #f4f4f5 surfaces, #e4e4e7
 * hairlines, #09090b ink and #71717a secondary text, with pastel badges for
 * the four scene categories and black "window" frames for media and code.
 * The previous design lives in index-classic.html / style-classic.css.
 */
:root {
  --bg: #ffffff;
  --bg-secondary: #f4f4f5;
  --text: #09090b;
  --text-secondary: #71717a;
  --text-tertiary: #a1a1aa;
  --border: #e4e4e7;
  --border-strong: #d4d4d8;
  --ink: #18181b;
  --window: #09090b;
  --window-border: #27272a;
  --sans:
    ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --title-font: Georgia, "Times New Roman", serif;
  --mono:
    ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono",
    monospace;
  --radius: 12px;
  --shadow-sm: 0 1px 2px #0000000d;
  --shadow-md: 0 4px 12px -2px #00000014, 0 1px 3px #0000000a;
  --tint-bg: #f4f4f5;
  --tint-fg: #3f3f46;
}
[data-category="object"] {
  --tint-bg: #dbeafe;
  --tint-fg: #1447e6;
}
[data-category="indoor"] {
  --tint-bg: #d0fae5;
  --tint-fg: #007956;
}
[data-category="street"] {
  --tint-bg: #fef3c6;
  --tint-fg: #b75000;
}
[data-category="aerial"] {
  --tint-bg: #f3e8ff;
  --tint-fg: #8200db;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: 72px;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 17.5px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
::selection {
  background: #dbeafe;
}
a {
  color: inherit;
  text-decoration: none;
}
button,
select {
  font: inherit;
  color: inherit;
}
button {
  cursor: pointer;
  touch-action: manipulation;
}
button:disabled {
  cursor: default;
}
button:focus-visible,
a:focus-visible,
select:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid #3080ff;
  outline-offset: 3px;
}
h1,
h2,
p {
  margin: 0;
}
svg {
  display: block;
}
button svg {
  pointer-events: none;
}
[hidden] {
  display: none !important;
}
.container {
  width: min(1120px, calc(100% - 48px));
  margin-inline: auto;
}
.icon {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex-shrink: 0;
}
.icon-library {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}
.sr-only {
  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;
  left: 16px;
  top: -60px;
  z-index: 200;
  padding: 8px 14px;
  border-radius: 8px;
  background: var(--ink);
  color: #fff;
  font-size: 15.5px;
}
.skip-link:focus {
  top: 12px;
}

/* Header: translucent white bar with a single hairline. */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--border);
  background: #ffffffcc;
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
}
.header-inner {
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.project-name {
  font-family: var(--title-font);
  font-style: italic;
  font-weight: 400;
}
.brand {
  font-size: 22px;
  letter-spacing: -0.03em;
}
nav {
  display: flex;
  align-items: center;
  gap: 24px;
}
nav a {
  color: var(--text-secondary);
  font-size: 15.5px;
  font-weight: 500;
  transition: color 0.15s;
}
nav a:hover,
nav a[aria-current="location"] {
  color: var(--text);
}

/* Hero */
.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding-top: 104px;
}
.hero-topline {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 26px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-secondary);
  color: #52525c;
  font-size: 14.5px;
  font-weight: 500;
}
.hero-badge i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #00bb7f;
}
.motion-toggle {
  width: 30px;
  height: 30px;
  display: grid;
  place-items: center;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--bg);
  color: var(--text-secondary);
  transition:
    background 0.15s,
    color 0.15s;
}
.motion-toggle:hover {
  background: var(--bg-secondary);
  color: var(--text);
}
.motion-toggle .icon {
  width: 12px;
  height: 12px;
}
.motion-toggle[aria-pressed="true"] .icon {
  fill: currentColor;
  stroke: none;
}
h1 {
  font-size: clamp(48px, 6vw, 84px);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -0.055em;
  white-space: nowrap;
}
h1 .project-name {
  display: inline-block;
  padding: 0.04em 0.08em 0.12em;
  margin: -0.04em -0.08em -0.12em;
}
#project-title {
  position: relative;
}
.title-infinity {
  position: absolute;
  top: 0.04em;
  right: -0.78em;
  width: 0.68em;
  height: 0.34em;
  pointer-events: none;
}
.title-infinity svg {
  width: 100%;
  height: 100%;
  overflow: visible;
  fill: none;
  stroke-width: 3.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.infinity-track {
  stroke: var(--ink);
}
.infinity-flow {
  stroke: #3080ff;
  stroke-dasharray: 16 84;
  animation: infinity-flow 2.8s linear infinite;
}
.is-title-still .infinity-flow {
  animation: none;
}
.is-motion-paused .infinity-flow {
  animation-play-state: paused;
}
@keyframes infinity-flow {
  to {
    stroke-dashoffset: -100;
  }
}

/* "Splat" briefly disperses into soft elliptical splats, then re-forms. */
.splat-word {
  position: relative;
  display: inline-block;
  vertical-align: bottom;
  --splat-duration: 9s;
}
.splat-ink {
  display: inline-block;
  transform-origin: 50% 65%;
}
.splats-ready .splat-ink {
  animation: splat-ink var(--splat-duration) ease-in-out infinite;
}
.splat-particles {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
  pointer-events: none;
  opacity: 0;
  animation: splat-particles var(--splat-duration) ease-in-out infinite;
}
.splat-dab {
  transform-box: fill-box;
  transform-origin: center;
  animation: splat-drift var(--splat-duration) cubic-bezier(0.4, 0, 0.2, 1)
    infinite;
}
.is-title-still .splat-ink {
  animation: none;
  opacity: 1;
  filter: none;
  transform: none;
}
.is-title-still .splat-particles,
.is-title-still .splat-dab {
  animation: none;
}
.is-title-still .splat-particles {
  opacity: 0;
}
.is-motion-paused .splat-ink,
.is-motion-paused .splat-particles,
.is-motion-paused .splat-dab {
  animation-play-state: paused;
}
@keyframes splat-ink {
  0%,
  7%,
  31%,
  100% {
    opacity: 1;
    filter: blur(0);
    transform: scale(1);
  }
  13% {
    opacity: 0.28;
    filter: blur(1px);
    transform: scale(1.015);
  }
  18% {
    opacity: 0.22;
    filter: blur(1px);
    transform: scale(1.02);
  }
  25% {
    opacity: 0.4;
    filter: blur(1px);
    transform: scale(0.995);
  }
  28% {
    opacity: 1;
    filter: blur(0);
    transform: scale(1.008);
  }
}
@keyframes splat-particles {
  0%,
  7%,
  31%,
  100% {
    opacity: 0;
  }
  12%,
  23% {
    opacity: 0.95;
  }
  27% {
    opacity: 0.35;
  }
}
@keyframes splat-drift {
  0%,
  10%,
  26%,
  100% {
    transform: translate(0, 0) rotate(-12deg) scale(1);
  }
  17% {
    transform: translate(var(--dx), var(--dy)) rotate(var(--rotation))
      scale(1.25, 0.95);
  }
}
.hero-subtitle {
  margin-top: 14px;
  white-space: nowrap;
  color: var(--text-secondary);
  font-size: 23px;
  line-height: 1.45;
  letter-spacing: -0.01em;
}
.subtitle-highlight {
  background: none;
  color: var(--text);
  font-weight: 600;
}
.authors {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px 20px;
  max-width: 860px;
  margin-top: 34px;
  font-size: 17.5px;
  font-weight: 500;
}
.author-name {
  white-space: nowrap;
}
a.author-name {
  text-decoration: underline;
  text-decoration-color: transparent;
  text-underline-offset: 4px;
  transition: text-decoration-color 0.15s;
}
a.author-name:hover {
  text-decoration-color: currentColor;
}
.author-name sup,
.affiliation-item sup {
  margin-left: 2px;
  color: var(--text-secondary);
  font-size: 0.65em;
  font-weight: 500;
}
.affiliations {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 4px 22px;
  margin-top: 10px;
  color: var(--text-secondary);
  font-size: 15.5px;
}
.affiliation-item sup {
  margin: 0 3px 0 0;
}
.author-note {
  margin: 8px 0 0;
  color: var(--text-secondary);
  font-size: 13px;
}
.content-placeholder {
  color: var(--text-tertiary);
}
.resource-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-top: 34px;
}
.button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  height: 40px;
  padding: 0 18px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  font-size: 15.5px;
  font-weight: 500;
  box-shadow: var(--shadow-sm);
  transition:
    background 0.15s,
    border-color 0.15s;
}
.button:hover {
  background: var(--bg-secondary);
}
.button-primary {
  border-color: var(--ink);
  background: var(--ink);
  color: #fff;
}
.button-primary:hover {
  background: #3f3f46;
}
.button[aria-disabled="true"] {
  opacity: 0.45;
  cursor: default;
  pointer-events: none;
}

/* Sections: centered heading with a quiet secondary line. */
.section {
  padding-top: 112px;
}
.section-heading {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  margin-bottom: 36px;
}
h2 {
  font-size: 35px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.025em;
}
.section-heading p {
  max-width: 680px;
  margin-top: 10px;
  color: var(--text-secondary);
  font-size: 18.5px;
  line-height: 1.6;
}
.tldr-copy {
  max-width: 760px;
  margin: -16px auto 0;
  text-align: center;
}
.tldr-copy p {
  color: #3f3f46;
  font-size: 21px;
  line-height: 1.7;
  white-space: pre-line;
}
.tldr-list {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: tldr;
  text-align: left;
}
.tldr-list li {
  position: relative;
  padding: 20px 24px 20px 72px;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--bg-secondary);
  color: #3f3f46;
  font-size: 19px;
  line-height: 1.65;
  counter-increment: tldr;
}
.tldr-copy strong {
  color: var(--text);
  font-weight: 650;
}
.tldr-copy .project-name {
  font-size: 1.08em;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.tldr-list li::before {
  content: counter(tldr, decimal-leading-zero);
  position: absolute;
  top: 21px;
  left: 24px;
  color: var(--text-secondary);
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 14px;
  line-height: 1.65em;
}
.text-skeleton {
  display: grid;
  justify-items: center;
  gap: 12px;
}
.text-skeleton span {
  height: 10px;
  width: 100%;
  border-radius: 999px;
  background: var(--bg-secondary);
}
.text-skeleton span:nth-child(2) {
  width: 88%;
}
.text-skeleton span:nth-child(3) {
  width: 56%;
}

/* Method: full-width paper figures with concise technical captions. */
.method-figures {
  display: grid;
  gap: 44px;
}
.method-figure {
  min-width: 0;
  margin: 0;
}
.method-image {
  overflow: hidden;
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fff;
}
.method-image img {
  display: block;
  width: 100%;
  height: auto;
}
.method-caption {
  max-width: 1000px;
  margin: 20px auto 0;
}
.method-caption-heading {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 20px;
  margin-bottom: 10px;
}
.method-caption h3 {
  margin: 0;
  color: var(--text);
  font-size: 19px;
  font-weight: 650;
  line-height: 1.4;
}
.method-label {
  margin-right: 8px;
  color: var(--text-secondary);
  font-weight: 500;
}
.method-fullsize {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: var(--text-secondary);
  font-size: 13px;
  white-space: nowrap;
}
.method-fullsize:hover {
  color: var(--text);
}
.method-fullsize .icon {
  width: 13px;
  height: 13px;
}
.method-caption p {
  margin: 0;
  color: #52525b;
  font-size: 16px;
  line-height: 1.75;
}
.method-caption strong {
  color: var(--text);
  font-weight: 600;
}
.method-explanation {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px;
}

/* Black window frame used for the film and the BibTeX. */
.window {
  overflow: hidden;
  border: 1px solid var(--window-border);
  border-radius: var(--radius);
  background: var(--window);
  box-shadow:
    0 20px 40px -24px #00000059,
    0 2px 6px #00000014;
}
.window-bar {
  position: relative;
  height: 40px;
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 16px;
  border-bottom: 1px solid var(--window-border);
}
.window-dots {
  display: flex;
  gap: 7px;
}
.window-dots i {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: #ff5f57;
}
.window-dots i:nth-child(2) {
  background: #febc2e;
}
.window-dots i:nth-child(3) {
  background: #28c840;
}
.window-title {
  color: var(--text-secondary);
  font-family: var(--mono);
  font-size: 13px;
}
.film-stage {
  position: relative;
  aspect-ratio: var(--film-ratio, 16 / 9);
  overflow: hidden;
  background: var(--window);
  color: #fafafa;
}
.film-placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  background: radial-gradient(ellipse at 50% 120%, #27272a, transparent 70%);
}
.play-disc {
  width: 64px;
  height: 64px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: #fafafa;
  color: var(--window);
}
.play-disc svg {
  width: 22px;
  height: 22px;
  margin-left: 3px;
  fill: currentColor;
}
.film-note {
  color: var(--text-tertiary);
  font-size: 15.5px;
}
.film-stage video,
.film-stage > iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  border: 0;
}
.video-loading {
  position: absolute;
  inset: 0;
  z-index: 1;
  display: grid;
  place-items: center;
  background: #09090b66;
  color: #fafafa;
  pointer-events: none;
}
.video-loading-indicator {
  position: relative;
  display: grid;
  place-items: center;
  width: 80px;
  height: 80px;
}
.video-loading-ring {
  position: absolute;
  inset: 0;
  border: 3px solid #ffffff40;
  border-top-color: #60a5fa;
  border-right-color: #60a5fa;
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
}
#video-loading-percent {
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}
.video-chapters {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
  margin-top: 20px;
}
.video-chapter {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 12px 8px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg);
  font-size: 14px;
  font-weight: 500;
  transition: background 0.15s, border-color 0.15s;
}
.video-chapter:hover,
.video-chapter[aria-pressed="true"] {
  border-color: var(--tint-fg);
  background: var(--tint-bg);
}
.video-chapter .icon {
  flex-shrink: 0;
  width: 17px;
  height: 17px;
  color: var(--tint-fg);
}
.video-chapter:disabled {
  opacity: 0.5;
}
.media-caption {
  margin-top: 14px;
  color: var(--text-secondary);
  font-size: 15.5px;
  text-align: center;
}
.video-error {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  gap: 10px;
  text-align: center;
  font-size: 15.5px;
}

/* Category segmented control. */
.gallery-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  margin-bottom: 20px;
}
.category-tabs {
  display: flex;
  gap: 2px;
  padding: 3px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--bg-secondary);
}
.category-tab {
  display: flex;
  align-items: center;
  gap: 7px;
  height: 34px;
  padding: 0 14px;
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: var(--text-secondary);
  font-size: 15.5px;
  font-weight: 500;
  white-space: nowrap;
  transition:
    background 0.15s,
    color 0.15s;
}
.category-icon {
  width: 15px;
  height: 15px;
}
.category-tab:not([aria-selected="true"]):hover {
  color: var(--text);
}
.category-tab[aria-selected="true"] {
  background: var(--ink);
  color: #fff;
  box-shadow: var(--shadow-sm);
}
.gallery-count {
  position: absolute;
  right: 0;
  color: var(--text-tertiary);
  font-family: var(--mono);
  font-size: 13px;
}

/* Viewer card: white chrome around a black viewport. */
.viewer-card {
  min-width: 0;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  box-shadow: var(--shadow-sm);
}
.viewer-toolbar {
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 0 10px 0 16px;
  border-bottom: 1px solid var(--border);
}
.viewer-title {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}
.viewer-title strong {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 16.5px;
  font-weight: 600;
}
.badge {
  flex-shrink: 0;
  padding: 2px 8px;
  border-radius: 6px;
  background: var(--tint-bg);
  color: var(--tint-fg);
  font-family: var(--mono);
  font-size: 12.5px;
  font-weight: 500;
  white-space: nowrap;
}
.badge:empty {
  display: none;
}
.badge-dark {
  background: var(--ink);
  color: #fff;
}
.viewer-tools {
  display: flex;
  align-items: center;
  gap: 2px;
  flex-shrink: 0;
}
.icon-button {
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  padding: 0;
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: var(--text-secondary);
  transition:
    background 0.15s,
    color 0.15s;
}
.icon-button:hover {
  background: var(--bg-secondary);
  color: var(--text);
}
.icon-button:disabled,
a.icon-button[aria-disabled="true"] {
  opacity: 0.35;
  pointer-events: none;
}
.text-button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 32px;
  padding: 0 12px 0 10px;
  border: 1px solid var(--border);
  border-radius: 7px;
  background: var(--bg);
  color: var(--text);
  font-size: 14.5px;
  font-weight: 500;
  white-space: nowrap;
  transition: background 0.15s;
}
.text-button:hover {
  background: var(--bg-secondary);
}
.text-button .icon {
  width: 14px;
  height: 14px;
}
.viewer-tools .text-button {
  margin-right: 6px;
}
.viewer-stage {
  position: relative;
  isolation: isolate;
  aspect-ratio: var(--stage-ratio, 16 / 9);
  overflow: hidden;
  background: var(--window);
}
.viewer-stage iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
  background: var(--window);
}
.viewer-stage:fullscreen {
  aspect-ratio: auto;
  width: 100%;
  height: 100%;
}
.viewer-footer {
  min-height: 42px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 16px;
  border-top: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 14.5px;
}
.powered-by {
  color: var(--text-tertiary);
}
.viewer-download-hint {
  margin: 14px 0 0;
  color: var(--text-secondary);
  font-size: 14px;
  line-height: 1.65;
  text-align: center;
}
.viewer-download-hint strong {
  color: var(--text);
  font-weight: 600;
}

/* Preview layer: poster + muted loop, then the live viewer on request. */
.viewer-preview {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: #18181b;
}
.preview-backdrop,
.preview-poster,
.preview-video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.preview-backdrop {
  object-fit: cover;
  filter: blur(28px) saturate(1.1) brightness(0.55);
  transform: scale(1.15);
}
.preview-video {
  opacity: 0;
  transition: opacity 0.3s;
}
.preview-video.is-ready {
  opacity: 1;
}
.viewer-preview.is-blank {
  background: radial-gradient(ellipse at 50% 55%, #27272a, var(--window) 70%);
}
.viewer-preview.is-blank .empty-orbit {
  margin-bottom: 56px;
}
.explore-button {
  position: absolute;
  left: 50%;
  bottom: 20px;
  z-index: 3;
  display: flex;
  align-items: center;
  gap: 8px;
  height: 40px;
  padding: 0 16px 0 18px;
  border: 0;
  border-radius: 999px;
  background: #ffffffeb;
  color: var(--text);
  font-size: 15.5px;
  font-weight: 600;
  white-space: nowrap;
  transform: translateX(-50%);
  box-shadow: 0 8px 24px -6px #00000066;
  backdrop-filter: blur(8px);
  transition:
    background 0.15s,
    transform 0.15s;
}
.explore-button:hover {
  background: #fff;
  transform: translateX(-50%) scale(1.03);
}
.explore-button .icon {
  width: 15px;
  height: 15px;
}
.preview-badge {
  position: absolute;
  left: 50%;
  bottom: 22px;
  padding: 5px 12px;
  border: 1px solid #ffffff26;
  border-radius: 999px;
  background: #09090bb3;
  color: var(--text-tertiary);
  font-size: 13px;
  white-space: nowrap;
  transform: translateX(-50%);
}
.mono {
  font-family: var(--mono);
}

/* Empty / loading states inside the dark viewport. */
.viewer-empty {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: radial-gradient(ellipse at 50% 55%, #27272a, var(--window) 70%);
  color: #e4e4e7;
}
.empty-orbit {
  position: relative;
  width: 130px;
  height: 100px;
  display: grid;
  place-items: center;
  margin-bottom: 12px;
}
.empty-orbit::before,
.empty-orbit::after {
  content: "";
  position: absolute;
  inset: 14px 2px;
  border: 1px solid #ffffff1f;
  border-radius: 50%;
  transform: rotate(-24deg);
}
.empty-orbit::after {
  inset: 2px 16px;
  transform: rotate(32deg);
}
.empty-cube {
  width: 56px;
  height: 56px;
  fill: none;
  stroke: #a1a1aa;
  stroke-width: 1;
}
.empty-title {
  font-size: 16.5px;
  font-weight: 500;
}
.empty-description {
  margin-top: 6px;
  color: var(--text-secondary);
  font-size: 14.5px;
}
.empty-scene-id {
  position: absolute;
  left: 16px;
  bottom: 14px;
  color: #52525c;
  font-family: var(--mono);
  font-size: 12px;
}
.viewport-corner {
  display: none;
}
.viewer-loading {
  position: absolute;
  inset: 0;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  background: var(--window);
  color: #d4d4d8;
  font-size: 15.5px;
}
.loading-ring {
  width: 26px;
  height: 26px;
  border: 2px solid #3f3f46;
  border-top-color: #fafafa;
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
}
.viewer-loading p {
  max-width: 280px;
  padding-inline: 12px;
  color: var(--text-tertiary);
  font-size: 14.5px;
  text-align: center;
}
.viewer-loading a,
.viewer-loading button {
  padding: 7px 14px;
  border: 1px solid #3f3f46;
  border-radius: 7px;
  background: transparent;
  color: #fafafa;
  font-size: 14.5px;
}
.fullscreen-close {
  display: none;
  position: absolute;
  top: 16px;
  right: 16px;
  z-index: 10;
  padding: 7px 12px;
  border: 1px solid #3f3f46;
  border-radius: 8px;
  background: #18181bf2;
  color: #fafafa;
  font-size: 14.5px;
}
.viewer-stage:fullscreen .fullscreen-close,
.viewer-stage.is-expanded .fullscreen-close {
  display: block;
}
.viewer-stage.is-expanded {
  position: fixed;
  inset: 16px;
  z-index: 101;
  aspect-ratio: auto;
  border-radius: var(--radius);
  box-shadow: 0 0 0 40px #09090bf0;
}
.has-expanded-viewer {
  overflow: hidden;
}

/* Scene cards, in the spirit of simple bordered list cards. */
.scene-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 12px;
  margin-top: 16px;
}
.scene-card {
  position: relative;
  min-width: 0;
  padding: 6px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  text-align: left;
  box-shadow: var(--shadow-sm);
  transition:
    border-color 0.15s,
    box-shadow 0.15s;
}
.scene-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
}
.scene-card[aria-pressed="true"] {
  border-color: var(--ink);
  box-shadow: 0 0 0 1px var(--ink);
}
.scene-thumb {
  position: relative;
  display: block;
  aspect-ratio: 1.6;
  overflow: hidden;
  border-radius: 7px;
  background: var(--bg-secondary);
}
.scene-thumb img {
  position: relative;
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.thumbnail-geometry {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  fill: none;
  stroke: var(--text-tertiary);
  stroke-width: 0.8;
}
.thumb-placeholder-label {
  display: none;
}
.scene-card-caption {
  display: flex;
  flex-direction: row-reverse;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  padding: 9px 4px 3px;
  font-size: 15px;
  font-weight: 600;
}
.scene-card-caption > span:not(.scene-number) {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.scene-number {
  flex-shrink: 0;
  padding: 1px 7px;
  border-radius: 6px;
  background: var(--tint-bg);
  color: var(--tint-fg);
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 500;
}
.scene-active-dot {
  display: none;
}
.empty-scenes {
  grid-column: 1 / -1;
  padding: 24px;
  color: var(--text-secondary);
  font-size: 15.5px;
  text-align: center;
}

/* Comparison */
.comparison-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.compare-stage {
  aspect-ratio: var(--stage-ratio, 1.26);
}
.model-control {
  position: relative;
  width: 200px;
  max-width: calc(100% - 90px);
}
.model-control select {
  width: 100%;
  height: 34px;
  padding: 0 34px 0 12px;
  appearance: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-secondary);
  color: var(--text);
  font-size: 15.5px;
  font-weight: 500;
  cursor: pointer;
}
.model-control > .icon {
  position: absolute;
  right: 10px;
  top: 9px;
  color: var(--text-secondary);
  pointer-events: none;
}
.comparison-footnote {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 32px;
  margin-top: 14px;
  color: var(--text-secondary);
  font-size: 14.5px;
}

/* Acknowledgements */
#acknowledgements .section-heading {
  margin-bottom: 0;
}
#acknowledgements-copy {
  max-width: none;
}
#acknowledgements-copy a {
  color: var(--text);
  font-weight: 500;
  text-decoration: underline;
  text-decoration-color: var(--border-strong);
  text-underline-offset: 4px;
  transition: text-decoration-color 0.15s;
}
#acknowledgements-copy a:hover {
  text-decoration-color: currentColor;
}

/* Citation */
.citation-window {
  max-width: 860px;
  margin-inline: auto;
}
.copy-citation {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
  height: 26px;
  padding: 0 10px;
  border: 1px solid var(--window-border);
  border-radius: 6px;
  background: #18181b;
  color: #d4d4d8;
  font-size: 13px;
  font-weight: 500;
  transition:
    background 0.15s,
    color 0.15s;
}
.copy-citation:hover {
  background: #27272a;
  color: #fff;
}
.copy-citation .icon {
  width: 13px;
  height: 13px;
}
.citation-code {
  margin: 0;
  padding: 20px 22px 22px;
  overflow-x: auto;
  color: #e4e4e7;
  font-family: var(--mono);
  font-size: 14.5px;
  line-height: 1.75;
  white-space: pre;
  scrollbar-width: thin;
  scrollbar-color: #3f3f46 transparent;
}

/* Footer */
.site-footer {
  margin-top: 120px;
  border-top: 1px solid var(--border);
}
.footer-inner {
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  color: var(--text-secondary);
  font-size: 15.5px;
}
.footer-inner .project-name {
  color: var(--text);
  font-size: 22px;
}
.footer-inner a:hover {
  color: var(--text);
}
.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  z-index: 150;
  max-width: calc(100% - 32px);
  padding: 10px 16px;
  border-radius: 10px;
  background: var(--ink);
  color: #fff;
  font-size: 15.5px;
  transform: translateX(-50%);
  box-shadow: var(--shadow-md);
}
.no-script {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 90;
  padding: 14px;
  background: var(--ink);
  color: #fff;
  font-size: 15.5px;
  text-align: center;
}
@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@media (max-width: 1000px) {
  .hero-subtitle {
    max-width: 640px;
    white-space: normal;
  }
}
@media (max-width: 900px) {
  .gallery-controls {
    flex-direction: column;
    gap: 10px;
  }
  .gallery-count {
    position: static;
  }
}
@media (max-width: 760px) {
  html {
    scroll-padding-top: 100px;
  }
  .container {
    width: calc(100% - 32px);
  }
  .header-inner {
    height: auto;
    flex-wrap: wrap;
    gap: 6px 16px;
    padding-block: 12px 10px;
  }
  nav {
    width: 100%;
    gap: 18px;
    overflow-x: auto;
    scrollbar-width: none;
  }
  nav a {
    font-size: 14px;
    white-space: nowrap;
  }
  .hero {
    padding-top: 64px;
  }
  .hero-topline {
    margin-bottom: 20px;
  }
  .hero-badge {
    font-size: 12.5px;
  }
  h1 {
    font-size: 10.5vw;
  }
  .hero-subtitle {
    font-size: 18px;
  }
  .authors {
    gap: 4px 14px;
    margin-top: 26px;
    font-size: 15px;
  }
  .affiliations {
    font-size: 14px;
  }
  .resource-links {
    margin-top: 26px;
  }
  .button {
    height: 38px;
    padding: 0 14px;
    font-size: 14px;
  }
  .section {
    padding-top: 80px;
  }
  .section-heading {
    margin-bottom: 26px;
  }
  h2 {
    font-size: 27.5px;
  }
  .section-heading p {
    font-size: 16px;
  }
  .tldr-copy p {
    font-size: 17px;
  }
  .tldr-list li {
    padding: 16px 18px 16px 54px;
    font-size: 16px;
  }
  .tldr-list li::before {
    top: 17px;
    left: 18px;
    font-size: 12.5px;
  }
  .window-bar {
    height: 36px;
    padding: 0 12px;
    gap: 12px;
  }
  .window-dots i {
    width: 9px;
    height: 9px;
  }
  .window-title {
    font-size: 11.5px;
  }
  .method-figures {
    gap: 32px;
  }
  .method-image {
    padding: 10px;
  }
  .method-caption {
    margin-top: 16px;
  }
  .method-caption h3 {
    font-size: 17px;
  }
  .method-caption p {
    font-size: 14.5px;
    line-height: 1.7;
  }
  .method-explanation {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  .video-chapters {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
    margin-top: 14px;
  }
  .video-chapter {
    gap: 6px;
    font-size: 13px;
  }
  .category-tabs {
    width: 100%;
  }
  .category-tab {
    flex: 1;
    justify-content: center;
    padding: 0 4px;
    font-size: 13px;
  }
  .category-icon {
    display: none;
  }
  .viewer-toolbar {
    height: 46px;
    padding: 0 6px 0 12px;
  }
  .viewer-title strong {
    font-size: 15px;
  }
  .icon-button {
    width: 30px;
    height: 30px;
  }
  .viewer-stage {
    aspect-ratio: var(--stage-ratio, 1.2);
  }
  .viewer-footer {
    padding: 9px 12px;
    font-size: 12.5px;
  }
  .fly-hint,
  .powered-by {
    display: none;
  }
  .explore-button {
    bottom: 12px;
    height: 34px;
    padding: 0 12px 0 14px;
    font-size: 14px;
  }
  .preview-badge {
    bottom: 12px;
    font-size: 11.5px;
  }
  .text-button {
    height: 30px;
    padding: 0 9px 0 7px;
    font-size: 12.5px;
  }
  .scene-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
  }
  .scene-card-caption {
    font-size: 13px;
  }
  /* Two narrow columns keep a tall frame; previews fill it. */
  .comparison-grid {
    gap: 8px;
  }
  .compare-stage {
    aspect-ratio: 0.75;
  }
  .compare-stage .preview-poster,
  .compare-stage .preview-video {
    object-fit: cover;
  }
  .comparison-grid .viewer-toolbar {
    padding: 0 4px 0 8px;
    gap: 4px;
  }
  .comparison-grid .badge,
  .comparison-grid [data-reset],
  .comparison-grid [data-standalone] {
    display: none;
  }
  .comparison-grid .viewer-footer > span:last-child {
    display: none;
  }
  .model-control {
    max-width: calc(100% - 34px);
  }
  .model-control select {
    height: 30px;
    padding: 0 24px 0 8px;
    font-size: 13px;
  }
  .model-control > .icon {
    right: 6px;
    top: 7px;
    width: 14px;
    height: 14px;
  }
  .compare-stage .empty-orbit {
    width: 96px;
    height: 76px;
  }
  .compare-stage .empty-cube {
    width: 40px;
    height: 40px;
  }
  .compare-stage .empty-title,
  .compare-stage .empty-description {
    padding-inline: 8px;
    font-size: 12.5px;
    text-align: center;
  }
  .compare-stage .empty-scene-id {
    display: none;
  }
  .comparison-footnote {
    font-size: 12.5px;
  }
  .citation-code {
    padding: 16px;
    font-size: 12px;
  }
  .site-footer {
    margin-top: 80px;
  }
}
@media (max-width: 380px) {
  .category-tab {
    min-width: 0;
    padding: 0 2px;
    font-size: 11.5px;
  }
}
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
  .splat-ink {
    opacity: 1;
    filter: none;
    transform: none;
  }
  .splat-particles {
    opacity: 0;
  }
}