@font-face {
  font-family: "Coherent Inter";
  src: url("assets/fonts/Inter-VariableFont_opsz,wght.ttf") format("truetype");
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
}

:root {
  --ink: #172033;
  --ink-soft: #344054;
  --muted: #667085;
  --line: #e2e8f0;
  --surface: #f7f9fc;
  --surface-strong: #eef3f9;
  --paper: #ffffff;
  --purple: #7567d9;
  --purple-dark: #5547bd;
  --blue: #3d8edb;
  --teal: #14a79c;
  --pink: #ed8aaf;
  --green: #75bd67;
  --shadow: 0 18px 48px rgba(29, 41, 57, 0.08);
  --shadow-soft: 0 8px 26px rgba(29, 41, 57, 0.07);
  --radius: 18px;
  --container: 1120px;
  --module-gap: 32px;
  --subsection-gap: 64px;
  --dataset-module-gap: 64px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 17px;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
}

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

button:focus-visible,
a:focus-visible,
[data-lightbox]:focus-visible {
  outline: 3px solid rgba(61, 142, 219, 0.5);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 9px 14px;
  border-radius: 8px;
  color: white;
  background: var(--ink);
  transform: translateY(-160%);
  transition: transform 180ms ease;
}

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

.hero {
  position: relative;
  min-height: 660px;
  display: grid;
  place-items: center;
  overflow: hidden;
  isolation: isolate;
  padding: 88px 24px 104px;
  background:
    linear-gradient(rgba(255, 255, 255, 0.89), rgba(255, 255, 255, 0.96)),
    linear-gradient(90deg, rgba(117, 103, 217, 0.07) 1px, transparent 1px),
    linear-gradient(rgba(117, 103, 217, 0.07) 1px, transparent 1px);
  background-size: auto, 44px 44px, 44px 44px;
}

.hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  width: min(720px, 86vw);
  height: 1px;
  bottom: 70px;
  left: 50%;
  background: linear-gradient(90deg, transparent, rgba(117, 103, 217, 0.5), transparent);
  transform: translateX(-50%);
}

.hero-glow {
  position: absolute;
  z-index: -2;
  border-radius: 50%;
  filter: blur(4px);
  opacity: 0.85;
}

.hero-glow-one {
  width: 480px;
  height: 480px;
  top: -250px;
  left: -170px;
  background: radial-gradient(circle, rgba(117, 103, 217, 0.28), transparent 68%);
}

.hero-glow-two {
  width: 520px;
  height: 520px;
  right: -210px;
  bottom: -280px;
  background: radial-gradient(circle, rgba(20, 167, 156, 0.22), transparent 68%);
}

.hero-inner {
  width: min(980px, 100%);
  text-align: center;
}

.project-kicker,
.section-kicker,
.mini-kicker {
  margin: 0 0 14px;
  color: var(--purple-dark);
  font-size: 0.76rem;
  font-weight: 760;
  letter-spacing: 0.15em;
  line-height: 1.35;
  text-transform: uppercase;
}

.project-kicker {
  display: inline-flex;
  padding: 7px 13px;
  border: 1px solid rgba(117, 103, 217, 0.22);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 6px 20px rgba(85, 71, 189, 0.07);
}

.wordmark {
  margin: 25px 0 8px;
  color: var(--ink);
  font-family: "Coherent Inter", Inter, ui-sans-serif, sans-serif;
  font-size: clamp(4.2rem, 9vw, 7rem);
  font-weight: 820;
  font-synthesis: none;
  letter-spacing: -0.075em;
  line-height: 0.92;
}

.wordmark-long {
  --wordmark-word-gap: 0.14em;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: center;
  column-gap: var(--wordmark-word-gap);
  row-gap: 0.08em;
  font-size: clamp(3.5rem, 7vw, 6rem);
  letter-spacing: -0.058em;
  overflow: visible;
}

.wordmark-lead,
.wordmark-tail {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  column-gap: var(--wordmark-word-gap);
  flex: 0 0 auto;
  isolation: isolate;
  overflow: visible;
  white-space: nowrap;
}

/* Optical correction for Inter: o/H have wider side bearings than m/W. */
.wordmark-tail {
  column-gap: 0.058em;
}

.wordmark-to {
  position: relative;
  z-index: 3;
  display: inline-flex;
  flex: 0 0 auto;
  align-self: baseline;
  align-items: center;
  justify-content: center;
  width: 1.04em;
  height: 1em;
  margin: 0;
  padding: 0;
  font-size: 0.64em;
  line-height: 1;
  overflow: visible;
  transform: translateY(-0.08em);
}

.wordmark-to-svg {
  display: block;
  width: 100%;
  height: 100%;
  overflow: visible;
}

.wordmark-how {
  position: relative;
  z-index: 1;
}

.hero-subtitle {
  margin: 20px auto 0;
  max-width: 840px;
  color: var(--ink-soft);
  font-size: clamp(1.4rem, 3vw, 2.15rem);
  font-weight: 650;
  letter-spacing: -0.025em;
  line-height: 1.25;
}

.hero-summary {
  max-width: 720px;
  margin: 20px auto 0;
  color: var(--muted);
  font-size: 1.05rem;
}

.hero-summary strong:first-child {
  color: var(--purple-dark);
}

.hero-summary strong:last-child {
  color: #087f78;
}

.author-line {
  margin-top: 22px;
  font-size: 1.05rem;
  font-weight: 650;
}

.author-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 4px 9px;
  max-width: 940px;
  margin-right: auto;
  margin-left: auto;
  color: var(--blue);
}

.author-list sup,
.affiliation-line sup {
  font-size: 0.66em;
  line-height: 0;
}

.author-separator {
  color: #a5afbd;
}

.affiliation-line {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 3px 16px;
  max-width: 920px;
  margin: 10px auto 0;
  color: var(--muted);
  font-size: 0.72rem;
  line-height: 1.45;
}

.author-line a {
  color: var(--blue);
  text-decoration: none;
}

.author-line a:hover {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.resource-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 25px;
}

.resource-button {
  display: inline-flex;
  text-decoration: none;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink-soft);
  background: rgba(255, 255, 255, 0.82);
  box-shadow: var(--shadow-soft);
  font-size: 0.89rem;
  font-weight: 650;
}

.button-icon {
  color: var(--purple);
  font-size: 1rem;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-top: 20px;
}

.hero-tags span {
  padding: 4px 10px;
  border-radius: 999px;
  color: var(--muted);
  background: rgba(238, 243, 249, 0.8);
  font-size: 0.76rem;
  font-weight: 600;
}

.scroll-cue {
  position: absolute;
  bottom: 24px;
  left: 50%;
  display: flex;
  gap: 8px;
  align-items: center;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-decoration: none;
  text-transform: uppercase;
  transform: translateX(-50%);
}

.scroll-cue span:last-child {
  animation: bob 1.8s ease-in-out infinite;
}

@keyframes bob {
  0%, 100% { transform: translateY(-2px); }
  50% { transform: translateY(4px); }
}

.section {
  padding: 96px 24px;
}

.section-tint {
  border-top: 1px solid rgba(226, 232, 240, 0.75);
  border-bottom: 1px solid rgba(226, 232, 240, 0.75);
  background: var(--surface);
}

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

.container.narrow {
  width: min(900px, 100%);
}

.section-heading {
  margin-bottom: 48px;
}

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

.section-heading h2 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 760;
  letter-spacing: -0.045em;
  line-height: 1.15;
}

.title-rule {
  display: block;
  width: 62px;
  height: 4px;
  margin: 18px auto 0;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--purple), var(--pink));
}

.section-intro {
  max-width: 760px;
  margin: 22px auto 0;
  color: var(--muted);
  font-size: 1.02rem;
}

.abstract-copy {
  position: relative;
  padding-left: 28px;
  color: var(--ink-soft);
  font-size: 1.035rem;
}

.abstract-copy::before {
  content: "";
  position: absolute;
  top: 7px;
  bottom: 7px;
  left: 0;
  width: 3px;
  border-radius: 999px;
  background: linear-gradient(var(--purple), var(--teal));
}

.abstract-copy p {
  margin: 0 0 18px;
}

.abstract-copy p:last-child {
  margin-bottom: 0;
}

.figure-card {
  overflow: hidden;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  box-shadow: var(--shadow-soft);
  transition: box-shadow 220ms ease, transform 220ms ease;
}

.figure-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-2px);
}

.figure-card img {
  width: 100%;
  height: auto;
  background: white;
}

[data-lightbox] {
  cursor: zoom-in;
}

.figure-card figcaption,
.demo-figure figcaption {
  padding: 18px 22px 20px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.58;
}

.figure-card figcaption strong {
  color: var(--ink-soft);
}

.figure-card-wide {
  width: 100%;
}

.dataset-sample-card {
  margin-top: var(--module-gap);
}

.figure-label {
  margin: 0;
  padding: 18px 22px 15px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(90deg, rgba(117, 103, 217, 0.08), rgba(20, 167, 156, 0.04));
}

.method-steps {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  align-items: center;
  gap: 15px;
  margin-top: 34px;
}

.method-steps article {
  min-height: 166px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 15px;
  background: var(--surface);
}

.step-index {
  color: var(--purple);
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.1em;
}

.method-steps h3 {
  margin: 9px 0 7px;
  font-size: 1.02rem;
  line-height: 1.3;
}

.method-steps p {
  margin: 0;
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.55;
}

.method-arrow {
  color: var(--purple);
  font-size: 1.4rem;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-bottom: var(--dataset-module-gap);
}

.stat-card {
  position: relative;
  display: grid;
  place-items: center;
  overflow: hidden;
  padding: 24px 20px;
  border: 1px solid var(--line);
  border-radius: 15px;
  background: var(--paper);
  box-shadow: var(--shadow-soft);
  text-align: center;
}

.stat-card-content {
  position: relative;
  z-index: 1;
  display: grid;
  justify-items: center;
  width: 100%;
  text-align: center;
}

.stat-card::after {
  content: "";
  display: none;
  position: absolute;
  right: -22px;
  bottom: -32px;
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: rgba(117, 103, 217, 0.07);
}

.stat-card:nth-child(2)::after,
.stat-card:nth-child(4)::after {
  background: rgba(20, 167, 156, 0.08);
}

.stat-card strong {
  display: block;
  width: 100%;
  color: var(--ink);
  font-size: clamp(1.5rem, 2.4vw, 2.05rem);
  font-weight: 780;
  letter-spacing: -0.035em;
  line-height: 1.1;
  text-align: center;
}

.stat-card span {
  display: block;
  width: 100%;
  margin-top: 7px;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.35;
  text-align: center;
}

.dataset-feature {
  display: grid;
  grid-template-columns: minmax(320px, 0.9fr) minmax(300px, 1.1fr);
  align-items: center;
  gap: 42px;
  padding: 30px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--paper);
  box-shadow: var(--shadow-soft);
}

.figure-card-compact {
  box-shadow: none;
}

.feature-copy h3,
.subsection-heading h3 {
  margin: 0;
  color: var(--ink);
  font-size: clamp(1.45rem, 3vw, 2rem);
  letter-spacing: -0.035em;
  line-height: 1.2;
}

.feature-copy > p:not(.mini-kicker) {
  margin: 14px 0 22px;
  color: var(--muted);
}

.domain-list {
  display: grid;
  gap: 9px;
}

.domain-list div {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--surface);
  font-size: 0.88rem;
}

.domain-list em {
  color: var(--muted);
  font-style: normal;
  font-variant-numeric: tabular-nums;
}

.domain-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.domain-dot.cooking { background: #55a9dc; }
.domain-dot.bike { background: #7ec848; }
.domain-dot.health { background: #8a70d5; }

.subsection-heading {
  margin: var(--subsection-gap) 0 24px;
}

.subsection-heading .section-kicker {
  margin-bottom: 8px;
}

.dataset-grid,
.analysis-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  align-items: start;
  column-gap: 24px;
  row-gap: var(--module-gap);
  margin-top: var(--module-gap);
}

.dataset-grid .figure-card {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.dataset-grid {
  grid-auto-rows: 1fr;
}

.dataset-chart-frame {
  display: grid;
  place-items: center;
  overflow: hidden;
  width: 100%;
  aspect-ratio: 1112 / 755;
  background: #fff;
}

.dataset-chart-frame img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
}

.dataset-grid figcaption {
  flex: 1 0 auto;
}

.paper-table-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  box-shadow: var(--shadow-soft);
}

.dataset-stats-card {
  margin-top: var(--subsection-gap);
}

.dataset-module-stack {
  display: grid;
  gap: var(--dataset-module-gap);
  margin-top: var(--dataset-module-gap);
}

.dataset-module-stack .dataset-stats-card,
.dataset-module-stack .dataset-grid,
.dataset-module-stack .dataset-sample-card,
.dataset-module-stack .video-comparison-grid {
  margin-top: 0;
}

.dataset-module-stack .dataset-grid {
  row-gap: var(--dataset-module-gap);
}

.paper-table-heading {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 18px 22px 15px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(90deg, rgba(117, 103, 217, 0.08), rgba(20, 167, 156, 0.04));
}

.paper-table-heading > span {
  flex: 0 0 auto;
  color: var(--purple-dark);
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.paper-table-heading h3,
.paper-table-heading h4,
.figure-label {
  margin: 0;
  color: var(--ink);
  font-family: inherit;
  font-size: 1.18rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.3;
}

.dataset-module-heading {
  display: flex;
  align-items: baseline;
  padding: 18px 22px 15px;
  border-bottom: 1px solid var(--line);
  background-color: #f1efff;
  background-image: linear-gradient(100deg, #f1efff 0%, #edf9f7 100%);
}

.paper-table-heading.dataset-module-heading {
  flex-direction: row;
  align-items: baseline;
  gap: 0;
}

.dataset-module-heading h3 {
  margin: 0;
  color: var(--ink);
  font-family: "Coherent Inter", Inter, ui-sans-serif, sans-serif;
  font-size: 1.18rem;
  font-weight: 700;
  font-synthesis: none;
  letter-spacing: -0.02em;
  line-height: 1.3;
}

.video-comparison-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  grid-auto-flow: column;
  grid-auto-columns: minmax(0, 1fr);
  align-items: stretch;
  gap: 24px;
  margin-top: var(--module-gap);
}

.video-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.video-card .dataset-module-heading {
  flex: 1 0 auto;
}

.video-card video {
  flex: 0 0 auto;
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: contain;
  background: #0b1020;
}

.table-scroll {
  overflow-x: auto;
  overscroll-behavior-inline: contain;
}

.paper-table {
  width: 100%;
  border-collapse: collapse;
  color: var(--ink-soft);
  font-size: 0.83rem;
  font-variant-numeric: tabular-nums;
  line-height: 1.35;
}

.paper-table th,
.paper-table td {
  padding: 11px 10px;
  border-bottom: 1px solid var(--line);
  text-align: center;
  white-space: nowrap;
}

.paper-table thead th {
  color: var(--ink);
  background: var(--surface);
  font-weight: 760;
}

.paper-table th:first-child {
  text-align: left;
}

.paper-table tbody tr:last-child > * {
  border-bottom: 0;
}

.paper-table tbody tr:not(.domain-row):hover > * {
  background: rgba(61, 142, 219, 0.045);
}

.paper-table strong {
  color: var(--ink);
  font-weight: 820;
}

.paper-table .second {
  color: var(--ink);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

.paper-table .domain-head,
.paper-table .domain-row > th {
  text-align: center;
  font-style: italic;
  font-weight: 800;
}

.health-head,
tr.health-head > th {
  background: #eee9f8 !important;
}

.bike-head,
tr.bike-head > th {
  background: #f8efcf !important;
}

.cooking-head,
tr.cooking-head > th {
  background: #e1f2fb !important;
}

.paper-table .domain-row > th {
  padding-top: 9px;
  padding-bottom: 9px;
  color: var(--ink);
  letter-spacing: 0.025em;
}

.paper-table .method-row > * {
  background: rgba(117, 103, 217, 0.075);
}

.paper-table .total-row > * {
  border-top: 2px solid #ccd4df;
  color: var(--ink);
  background: var(--surface);
  font-weight: 780;
}

.paper-table .selected-setting > * {
  background: rgba(117, 103, 217, 0.09);
}

.paper-table sub,
.paper-table sup {
  line-height: 0;
}

.table-note {
  margin: 0;
  padding: 14px 22px 17px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.55;
}

.dataset-stats-table {
  min-width: 850px;
}

.interaction-table {
  min-width: 980px;
}

.pose-table {
  min-width: 940px;
}

.main-result-table + .main-result-table {
  margin-top: var(--module-gap);
}

.analysis-stack {
  display: grid;
  gap: 54px;
}

.analysis-block-heading {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}

.analysis-block-heading > span {
  display: grid;
  width: 40px;
  height: 40px;
  place-items: center;
  flex: 0 0 auto;
  border-radius: 50%;
  color: var(--purple-dark);
  background: var(--surface-strong);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.analysis-block-heading h4,
.analysis-block-heading p {
  margin: 0;
}

.analysis-block-heading h4 {
  color: var(--ink);
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.analysis-block-heading p {
  margin-top: 3px;
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.45;
}

.analysis-pair {
  display: grid;
  grid-template-columns: minmax(300px, 0.72fr) minmax(590px, 1.28fr);
  align-items: start;
  gap: 24px;
}

.compact-table-card {
  min-width: 0;
}

.compact-heading {
  padding-top: 14px;
  padding-bottom: 12px;
}

.compact-heading h4 {
  font-size: 1rem;
}

.compact-table {
  min-width: 580px;
  font-size: 0.75rem;
}

.compact-table th,
.compact-table td {
  padding: 7px 7px;
}

.result-highlights {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin-bottom: 34px;
}

.result-highlights article {
  padding: 22px 18px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--surface);
  text-align: center;
}

.result-highlights .highlight-callout {
  border-color: rgba(117, 103, 217, 0.25);
  background: linear-gradient(145deg, rgba(117, 103, 217, 0.1), rgba(61, 142, 219, 0.07));
}

.result-domain {
  display: block;
  margin-bottom: 7px;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.result-highlights strong {
  display: block;
  color: var(--ink);
  font-size: clamp(1.55rem, 3vw, 2.25rem);
  letter-spacing: -0.04em;
  line-height: 1.1;
}

.result-highlights small {
  color: var(--muted);
  font-size: 0.48em;
  font-weight: 650;
  letter-spacing: 0;
}

.result-highlights p {
  margin: 7px 0 0;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.35;
}

#results > .container > .figure-card + .figure-card {
  margin-top: var(--module-gap);
}

.analysis-grid .figure-card {
  height: 100%;
}

#qualitative .container {
  width: min(1320px, 100%);
}

.demo-shell {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--paper);
  box-shadow: var(--shadow);
}

.qualitative-stack {
  display: grid;
  gap: var(--module-gap);
}

.demo-domain-title {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 2px 2px 16px;
}

.demo-domain-title > span {
  display: grid;
  width: 38px;
  height: 38px;
  place-items: center;
  flex: 0 0 auto;
  border-radius: 50%;
  color: var(--accent);
  background: var(--surface-strong);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
}

.demo-domain-title h3,
.demo-domain-title p {
  margin: 0;
}

.demo-domain-title h3 {
  font-size: 1.18rem;
}

.demo-domain-title p {
  margin-top: 3px;
  color: var(--muted);
  font-size: 0.88rem;
}

.demo-tabs {
  display: inline-flex;
  gap: 5px;
  margin-bottom: 16px;
  padding: 5px;
  border-radius: 999px;
  background: var(--surface-strong);
}

.demo-tab {
  min-width: 130px;
  padding: 10px 18px;
  border: 0;
  border-radius: 999px;
  color: var(--muted);
  background: transparent;
  cursor: pointer;
  font: inherit;
  font-size: 0.87rem;
  font-weight: 700;
  transition: color 160ms ease, background 160ms ease, box-shadow 160ms ease;
}

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

.demo-tab.is-active {
  color: white;
  background: var(--ink);
  box-shadow: 0 6px 14px rgba(23, 32, 51, 0.2);
}

.demo-figure {
  overflow: hidden;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 14px;
}

.demo-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: auto;
  object-fit: contain;
  transition: opacity 160ms ease, transform 220ms ease;
}

.demo-figure img.is-switching {
  opacity: 0.25;
  transform: scale(0.995);
}

.conclusion {
  position: relative;
  overflow: hidden;
}

.conclusion::before {
  content: "";
  position: absolute;
  z-index: -1;
  width: 540px;
  height: 540px;
  top: 50%;
  left: 50%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(117, 103, 217, 0.07), transparent 68%);
  transform: translate(-50%, -50%);
}

.conclusion-mark {
  margin-top: 30px;
  color: var(--ink);
  font-size: 1.12rem;
  font-weight: 760;
  letter-spacing: -0.02em;
  text-align: center;
}

.conclusion-mark span {
  display: inline-block;
  padding: 0 9px;
  color: var(--purple);
}

.acknowledgment-card,
.citation-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  box-shadow: var(--shadow-soft);
}

.acknowledgment-card {
  padding: 24px 28px;
  color: var(--ink-soft);
  font-size: 1.01rem;
  line-height: 1.75;
}

.acknowledgment-card p {
  margin: 0;
}

.citation-card {
  margin-top: 28px;
}

.citation-card pre {
  overflow-x: auto;
  margin: 0;
  padding: 24px 28px;
  color: #e8edf7;
  background: #172033;
  font-size: 0.82rem;
  line-height: 1.65;
  tab-size: 2;
  white-space: pre;
}

.citation-card code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

footer {
  padding: 28px 24px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  background: var(--surface);
}

.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 22px;
  font-size: 0.78rem;
}

.footer-inner p {
  margin: 0;
}

.footer-inner strong {
  color: var(--ink-soft);
}

.back-to-top {
  position: fixed;
  z-index: 30;
  right: 22px;
  bottom: 22px;
  width: 46px;
  height: 46px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 50%;
  color: white;
  background: var(--ink);
  box-shadow: 0 12px 30px rgba(23, 32, 51, 0.22);
  cursor: pointer;
  font-size: 1.1rem;
  opacity: 0;
  pointer-events: none;
  transform: translateY(12px);
  transition: opacity 180ms ease, transform 180ms ease, background 180ms ease;
}

.back-to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--purple-dark);
}

.lightbox {
  width: min(96vw, 1500px);
  max-height: 94vh;
  padding: 15px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 18px;
  color: white;
  background: rgba(14, 20, 33, 0.96);
  box-shadow: 0 28px 90px rgba(0, 0, 0, 0.42);
}

.lightbox::backdrop {
  background: rgba(9, 14, 24, 0.78);
  backdrop-filter: blur(5px);
}

.lightbox img {
  width: auto;
  max-width: 100%;
  max-height: 82vh;
  margin: 0 auto;
  border-radius: 9px;
  object-fit: contain;
}

.lightbox p {
  margin: 10px 48px 0;
  color: rgba(255, 255, 255, 0.74);
  font-size: 0.82rem;
  line-height: 1.45;
  text-align: center;
}

.lightbox-close {
  position: absolute;
  z-index: 2;
  top: 10px;
  right: 10px;
  width: 38px;
  height: 38px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 50%;
  color: white;
  background: rgba(14, 20, 33, 0.82);
  cursor: pointer;
  font-size: 1.35rem;
  line-height: 1;
}

.js .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 600ms ease, transform 600ms ease;
}

.js .reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1000px) {
  .analysis-pair {
    grid-template-columns: 1fr;
  }

  .analysis-pair > .figure-card {
    width: min(720px, 100%);
    margin: 0 auto;
  }
}

@media (max-width: 860px) {
  .hero {
    min-height: 610px;
    padding-top: 76px;
  }

  .section {
    padding: 76px 20px;
  }

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

  .method-steps article {
    min-height: 0;
  }

  .method-arrow {
    transform: rotate(90deg);
    justify-self: center;
  }

  .stat-grid,
  .result-highlights {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .dataset-feature {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .dataset-feature .figure-card {
    max-width: 600px;
    margin: 0 auto;
  }

  .dataset-grid,
  .analysis-grid {
    grid-template-columns: 1fr;
  }

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

  .paper-table-heading {
    align-items: flex-start;
    flex-direction: column;
    gap: 5px;
  }

  .footer-inner {
    display: grid;
    text-align: center;
  }
}

@media (max-width: 560px) {
  :root {
    --module-gap: 24px;
    --subsection-gap: 48px;
    --dataset-module-gap: 48px;
  }

  body {
    font-size: 16px;
  }

  .hero {
    min-height: 620px;
    padding-right: 18px;
    padding-left: 18px;
  }

  .wordmark {
    font-size: clamp(3.15rem, 17vw, 4.25rem);
  }

  .wordmark-long {
    font-size: clamp(2.6rem, 12.5vw, 3.45rem);
    line-height: 1.02;
  }

  .author-list {
    gap: 4px 7px;
    font-size: 0.91rem;
  }

  .affiliation-line {
    display: grid;
    gap: 2px;
    font-size: 0.66rem;
  }

  .hero-subtitle {
    font-size: 1.35rem;
  }

  .hero-summary {
    font-size: 0.94rem;
  }

  .resource-row {
    display: grid;
  }

  .resource-button {
    justify-content: center;
    min-width: 220px;
  }

  .section {
    padding: 62px 16px;
  }

  .section-heading {
    margin-bottom: 34px;
  }

  .abstract-copy {
    padding-left: 19px;
  }

  .figure-card,
  .dataset-feature,
  .demo-shell {
    border-radius: 14px;
  }

  .figure-card figcaption,
  .demo-figure figcaption {
    padding: 14px 15px 16px;
    font-size: 0.8rem;
  }

  .stat-grid,
  .result-highlights {
    gap: 10px;
  }

  .stat-card,
  .result-highlights article {
    padding: 18px 12px;
  }

  .dataset-feature {
    padding: 16px;
  }

  .paper-table-card {
    border-radius: 14px;
  }

  .paper-table-heading {
    padding: 14px 15px 12px;
  }

  .dataset-module-heading {
    padding: 14px 15px 12px;
  }

  .paper-table-heading h3,
  .paper-table-heading h4,
  .figure-label {
    font-size: 1rem;
  }

  .dataset-module-heading h3 {
    font-size: 1rem;
  }

  .figure-label {
    padding: 14px 15px 12px;
  }

  .video-comparison-grid {
    gap: 10px;
  }

  .table-note {
    padding: 12px 15px 14px;
    font-size: 0.74rem;
  }

  .paper-table {
    font-size: 0.76rem;
  }

  .paper-table th,
  .paper-table td {
    padding: 9px 8px;
  }

  .subsection-heading {
    margin-top: var(--subsection-gap);
  }

  .demo-shell {
    padding: 10px;
  }

  .acknowledgment-card {
    padding: 19px 20px;
  }

  .citation-card pre {
    padding: 19px 20px;
    font-size: 0.73rem;
  }

  .demo-tabs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    width: 100%;
  }

  .demo-tab {
    min-width: 0;
    padding-right: 10px;
    padding-left: 10px;
  }

  .back-to-top {
    right: 14px;
    bottom: 14px;
  }
}

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

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

  .js .reveal {
    opacity: 1;
    transform: none;
  }
}

@media print {
  .reveal {
    opacity: 1 !important;
    transform: none !important;
  }

  .back-to-top,
  .scroll-cue,
  .skip-link,
  .lightbox {
    display: none !important;
  }

  .section {
    break-inside: avoid;
  }
}