@import url("https://fonts.googleapis.com/css2?family=Fraunces:opsz,wght,SOFT@9..144,600..800,0..100&family=Inter:wght@400;500;600;700;800&family=JetBrains+Mono:wght@500;600;700&display=swap");

:root {
  --paper: #f7f9fc;
  --paper-2: #f0f5f8;
  --surface: #ffffff;
  --ink: #172033;
  --muted: #647086;
  --quiet: #8d9aad;
  --line: #dfe7f0;
  --line-strong: #c7d7e6;
  --blue: #246bfe;
  --teal: #008c83;
  --violet: #7a48cf;
  --rose: #d64d82;
  --gold: #c7831b;
  --shadow: 0 18px 46px rgba(42, 65, 100, 0.10);
  --radius: 18px;
  --mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  --display: "Fraunces", Georgia, serif;
  --sans: "Inter", ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    linear-gradient(180deg, #eef6ff 0, var(--paper) 620px),
    var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.65;
  letter-spacing: 0;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(36, 107, 254, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(36, 107, 254, 0.045) 1px, transparent 1px);
  background-size: 36px 36px;
  mask-image: linear-gradient(180deg, #000 0, transparent 780px);
  pointer-events: none;
}

a {
  color: var(--teal);
  text-decoration: none;
}

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

img {
  max-width: 100%;
}

.icon-sprite {
  display: none;
}

.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 30;
  border-bottom: 1px solid rgba(223, 231, 240, 0.66);
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: blur(18px) saturate(160%);
}

.nav-inner {
  width: min(1220px, calc(100% - 40px));
  min-height: 66px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.nav-brand-row {
  display: inline-flex;
  align-items: center;
  min-width: 0;
  gap: 12px;
}

.brand {
  display: inline-flex;
  align-items: center;
  color: var(--ink);
  font-family: var(--display);
  font-size: 1.35rem;
  font-weight: 760;
  line-height: 1;
}

.brand img {
  width: 174px;
  height: auto;
  max-height: 46px;
  object-fit: contain;
}

.brand:hover {
  text-decoration: none;
}

.nav-divider {
  width: 1px;
  height: 24px;
  flex: 0 0 auto;
  background: rgba(122, 72, 207, 0.28);
}

.nav-unit {
  display: block;
  width: auto;
  object-fit: contain;
}

.nav-unit.kuaishou {
  height: 19px;
}

.nav-unit.zju {
  height: 30px;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 18px;
  font-family: var(--mono);
  font-size: 0.82rem;
  font-weight: 700;
}

.nav-links a {
  color: #46516a;
}

.nav-links a:hover {
  color: var(--violet);
  text-decoration-color: rgba(122, 72, 207, 0.42);
}

.hero {
  min-height: 0;
  display: flex;
  align-items: center;
  padding: 96px 0 12px;
}

.hero-inner {
  width: min(1120px, calc(100% - 48px));
  margin: 0 auto;
  text-align: center;
}

.hero-content {
  margin: 0 auto;
}

.eyebrow,
.section-kicker {
  margin: 0 0 16px;
  color: var(--violet);
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  max-width: 1080px;
  margin: 0 auto;
  color: var(--ink);
  font-family: var(--display);
  font-size: clamp(2.58rem, 3.05vw, 2.95rem);
  font-weight: 760;
  line-height: 1.05;
  letter-spacing: 0;
}

.title-line {
  display: block;
  white-space: nowrap;
}

.title-line-1 {
  font-size: 1em;
}

.title-line-2 {
  font-size: 0.98em;
}

.hero-copy {
  max-width: 780px;
  margin: 16px auto 0;
  color: #354258;
  font-size: 1.08rem;
  line-height: 1.48;
}

.hero-authors {
  max-width: 880px;
  margin: 16px auto 0;
  color: #40506a;
  font-size: 0.98rem;
  font-weight: 650;
  line-height: 1.58;
}

.hero-authors sup,
.hero-affiliations-text sup {
  color: var(--violet);
  font-size: 0.72em;
}

.author-role {
  display: inline-flex;
  align-items: center;
  min-height: 20px;
  margin-left: 5px;
  padding: 0 7px;
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 0.62rem;
  font-weight: 800;
  line-height: 1;
  vertical-align: 2px;
  white-space: nowrap;
}

.project-lead {
  border: 1px solid rgba(122, 72, 207, 0.22);
  background: #f2ecff;
  color: #6640b8;
}

.corresponding-author {
  border: 1px solid rgba(0, 140, 131, 0.24);
  background: #e9fbf8;
  color: #08766f;
}

.hero-affiliations-text {
  margin: 8px auto 0;
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 600;
}

.hero-contact {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin: 8px auto 0;
  color: #52627a;
  font-family: var(--mono);
  font-size: 0.82rem;
  font-weight: 700;
}

.hero-contact svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: var(--teal);
  stroke-width: 1.9;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.hero-contact a {
  color: var(--violet);
}

.mail-marker {
  display: inline-flex;
  width: 18px;
  height: 18px;
  margin-left: 4px;
  color: var(--teal);
  vertical-align: -3px;
}

.mail-marker svg {
  width: 100%;
  height: 100%;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.9;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin: 24px auto 0;
  max-width: 880px;
}

.affiliations {
  display: inline-flex;
  align-items: center;
  gap: 16px;
  margin-top: 28px;
  padding: 11px 18px;
  border: 1px solid rgba(199, 215, 230, 0.74);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.64);
  box-shadow: 0 8px 20px rgba(42, 65, 100, 0.06);
}

.affiliations span {
  color: var(--quiet);
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.affiliation-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #4d5d74 !important;
  font-family: var(--sans) !important;
  font-size: 0.94rem !important;
  font-weight: 750 !important;
  letter-spacing: 0 !important;
  text-transform: none !important;
}

.affiliations img {
  display: block;
  width: auto;
  height: 28px;
  object-fit: contain;
}

.affiliations img[alt="Kuaishou"] {
  height: 24px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 42px;
  padding: 12px 22px;
  border: 1px solid currentColor;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.78);
  color: var(--ink);
  box-shadow: 0 2px 8px rgba(15, 23, 42, 0.05);
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 700;
  line-height: 1;
  transition: transform 180ms ease, background 180ms ease, color 180ms ease, box-shadow 180ms ease;
}

.button-icon {
  width: 16px;
  height: 16px;
  flex: 0 0 auto;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.button-icon.fill-icon {
  fill: currentColor;
  stroke: none;
}

.button-icon.arxiv-icon {
  width: 15px;
  height: 20px;
  object-fit: contain;
}

.hf-emoji {
  display: inline-flex;
  width: 18px;
  height: 18px;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  font-size: 1.06rem;
  line-height: 1;
}

.button.primary {
  border-color: var(--ink);
  background: var(--ink);
  color: #ffffff;
}

.button.secondary {
  border-color: var(--line);
  background: #ffffff;
  color: var(--ink);
}

.button.accent {
  border-color: rgba(122, 72, 207, 0.28);
  background: #f4f0ff;
  color: #5d39b8;
}

.button.accent.soft {
  border-color: rgba(36, 107, 254, 0.22);
  background: #eef4ff;
  color: #315fd3;
}

.button:hover {
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 0 12px 24px rgba(122, 72, 207, 0.16);
}

.section {
  padding: 86px 0;
}

#videos {
  padding-top: 16px;
}

.section.alt {
  background: rgba(238, 246, 249, 0.72);
}

.wrap {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
}

.section-head {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 0.72fr);
  gap: 56px;
  align-items: end;
  margin-bottom: 30px;
}

h2 {
  margin: 0;
  color: var(--ink);
  font-family: var(--display);
  font-size: 3.1rem;
  font-weight: 760;
  line-height: 1.06;
  letter-spacing: 0;
}

.lead {
  max-width: 760px;
  margin: 0;
  color: var(--muted);
  font-size: 1.08rem;
}

.grid {
  display: grid;
  gap: 18px;
}

.grid.three {
  grid-template-columns: repeat(3, 1fr);
}

.grid.two {
  grid-template-columns: repeat(2, 1fr);
}

.card,
.feature-player,
.feature-copy,
.video-card,
.result-panel,
.paper-figure,
.table-wrap,
.resource,
.citation {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.88);
  box-shadow: var(--shadow);
}

.card {
  overflow: hidden;
}

.card-body {
  padding: 26px;
}

.card h3 {
  margin: 0 0 10px;
  color: #101827;
  font-size: 1.18rem;
}

.card p {
  margin: 0;
  color: var(--muted);
}

.video-feature {
  display: grid;
  grid-template-columns: minmax(0, 1.48fr) minmax(320px, 0.72fr);
  gap: 22px;
  align-items: stretch;
  margin-bottom: 26px;
}

.feature-player,
.feature-copy {
  overflow: hidden;
}

.feature-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 34px;
}

.feature-copy h3 {
  margin: 16px 0 12px;
  color: #101827;
  font-family: var(--display);
  font-size: 2rem;
  line-height: 1.15;
}

.feature-copy p {
  margin: 0;
  color: var(--muted);
}

.video-frame {
  position: relative;
  aspect-ratio: 16 / 9;
  background: #101827;
  overflow: hidden;
}

.video-frame iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.video-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 16px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.82rem;
}

.comparison-library {
  display: grid;
  gap: 24px;
}

.comparison-card {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.88);
  box-shadow: var(--shadow);
}

.comparison-head {
  display: grid;
  grid-template-columns: minmax(260px, 0.9fr) minmax(360px, 1.1fr);
  gap: 22px;
  align-items: start;
  margin-bottom: 18px;
}

.comparison-head h3 {
  grid-column: 1;
  grid-row: 2;
  margin: 9px 0 0;
  color: #101827;
  font-family: var(--display);
  font-size: 1.72rem;
  line-height: 1.12;
}

.bench-label {
  grid-column: 1;
  grid-row: 1;
  display: inline-flex;
  width: fit-content;
  align-items: center;
  min-height: 28px;
  padding: 0 12px;
  border: 1px solid rgba(122, 72, 207, 0.25);
  border-radius: 999px;
  background: #f2ecff;
  color: var(--violet);
  font-family: var(--mono);
  font-size: 0.74rem;
  font-weight: 800;
}

.task-query {
  grid-column: 2;
  grid-row: 1 / span 2;
  margin: 0;
  padding: 14px 16px;
  border: 1px solid rgba(199, 215, 230, 0.78);
  border-radius: 12px;
  background: rgba(247, 250, 252, 0.92);
  color: #52627a;
  font-size: 0.94rem;
  line-height: 1.5;
}

.task-query strong {
  color: #101827;
}

.paired-videos {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.video-card {
  display: flex;
  flex-direction: column;
  gap: 15px;
  padding: 14px;
}

.video-card > .video-frame {
  border-radius: 12px;
}

.video-card h3 {
  margin: 11px 0 4px;
  color: #101827;
  font-size: 1.08rem;
}

.video-card h4 {
  margin: 0;
  color: #101827;
  font-size: 1.04rem;
}

.video-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.track-title {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.status-pill {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  min-height: 26px;
  padding: 0 10px;
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 800;
}

.status-pill.failed {
  border: 1px solid rgba(214, 77, 130, 0.28);
  background: #fff1f5;
  color: #b4235b;
}

.status-pill.success {
  border: 1px solid rgba(0, 140, 131, 0.28);
  background: #e9fbf8;
  color: #08766f;
}

.tag {
  display: inline-flex;
  align-items: center;
  min-height: 28px;
  padding: 0 12px;
  border: 1px solid rgba(122, 72, 207, 0.25);
  border-radius: 999px;
  background: #f2ecff;
  color: var(--violet);
  font-family: var(--mono);
  font-size: 0.74rem;
  font-weight: 700;
}

.result-image {
  width: 100%;
  display: block;
  background: #fff;
}

.result-panel,
.paper-figure {
  overflow: hidden;
}

.leaderboard-stack {
  display: grid;
  gap: 22px;
}

.leaderboard-panel {
  display: block;
  width: 100%;
  margin: 0 auto;
}

.leaderboard-panel:hover {
  text-decoration: none;
}

.leaderboard-panel.memgui,
.leaderboard-panel.mobileworld {
  max-width: 980px;
}

.result-caption,
.figure-caption {
  padding: 18px 20px;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.paper-figure {
  margin-bottom: 22px;
}

.paper-figure img {
  display: block;
  width: 100%;
  background: #fff;
}

.figure-grid {
  align-items: stretch;
}

.figure-grid .paper-figure {
  display: flex;
  flex-direction: column;
}

.figure-grid .paper-figure img {
  height: 360px;
  object-fit: contain;
  padding: 16px;
}

.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 720px;
}

th,
td {
  padding: 15px 16px;
  border-bottom: 1px solid var(--line);
  text-align: left;
}

th {
  color: var(--quiet);
  font-family: var(--mono);
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

td strong {
  color: var(--teal);
}

tr:last-child td {
  border-bottom: 0;
}

.resource-list {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.resource {
  display: inline-flex;
  flex: 1 1 220px;
  align-items: center;
  justify-content: center;
  min-height: 72px;
  max-width: 310px;
  padding: 0 28px;
  border-radius: 999px;
  gap: 12px;
  text-align: center;
}

.resource.resource-primary {
  border-color: #101827;
  background: #101827;
  color: #ffffff;
}

.resource b {
  display: inline;
  margin-bottom: 0;
  color: inherit;
  font-family: var(--mono);
  font-size: 0.95rem;
}

.resource span {
  color: inherit;
  font-size: 0.88rem;
  opacity: 0.72;
}

.citation {
  margin: 0;
  padding: 24px;
  overflow-x: auto;
  background: #101827;
  color: #edf6ff;
  font-size: 0.92rem;
}

footer {
  padding: 34px 0;
  border-top: 1px solid var(--line);
  color: var(--muted);
  background: rgba(255, 255, 255, 0.86);
}

@media (max-width: 980px) {
  .nav-inner,
  .hero-inner,
  .section-head,
  .video-feature,
  .comparison-head {
    display: block;
  }

  .nav-inner {
    padding: 14px 0;
  }

  .nav-brand-row {
    width: 100%;
    flex-wrap: wrap;
  }

  .nav-links {
    justify-content: flex-start;
    margin-top: 12px;
  }

  .hero {
    padding-top: 128px;
  }

  .title-line {
    white-space: normal;
  }

  .comparison-head h3,
  .bench-label,
  .task-query {
    grid-column: auto;
    grid-row: auto;
  }

  .feature-copy {
    margin-top: 18px;
  }

  .grid.three,
  .grid.two,
  .paired-videos,
  .resource-list {
    grid-template-columns: 1fr;
  }

  .task-query {
    margin-top: 14px;
  }
}

@media (max-width: 620px) {
  .nav-inner,
  .wrap,
  .hero-inner {
    width: min(100% - 32px, 1180px);
  }

  .brand {
    font-size: 1.18rem;
  }

  .brand img {
    width: 164px;
  }

  .nav-brand-row {
    gap: 9px;
  }

  .nav-divider {
    height: 20px;
  }

  .nav-unit.kuaishou {
    height: 17px;
  }

  .nav-unit.zju {
    height: 26px;
  }

  .nav-links {
    gap: 12px 16px;
  }

  .hero {
    min-height: auto;
    padding: 132px 0 18px;
  }

  #videos {
    padding-top: 18px;
  }

  h1 {
    font-size: 2.35rem;
    line-height: 1.06;
  }

  h2 {
    font-size: 2.25rem;
  }

  .hero-copy {
    font-size: 1rem;
  }

  .figure-grid .paper-figure img {
    height: 260px;
    padding: 12px;
  }

  .hero-authors {
    font-size: 0.95rem;
  }

  .hero-affiliations-text {
    font-size: 0.9rem;
  }

  .button {
    width: 100%;
    min-height: 50px;
  }

  .hero-actions {
    margin-top: 22px;
  }

  .resource {
    max-width: none;
    width: 100%;
  }

  .leaderboard-panel.memgui,
  .leaderboard-panel.mobileworld {
    max-width: 100%;
  }

  .affiliations {
    width: 100%;
    justify-content: center;
    flex-wrap: wrap;
    border-radius: 18px;
  }

  .section {
    padding: 62px 0;
  }
}