:root {
  --paper: #f6f8fb;
  --surface: #ffffff;
  --surface-soft: #edf5f2;
  --ink: #1f2526;
  --muted: #67706d;
  --line: #d9e2e2;
  --teal: #2a7a78;
  --green: #3a8f54;
  --coral: #d35244;
  --violet: #6f5fb7;
  --amber: #b7791f;
  --shadow: 0 14px 34px rgba(31, 37, 38, 0.08);
  --shadow-hover: 0 18px 42px rgba(31, 37, 38, 0.13);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.58;
}

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

a {
  color: inherit;
  text-decoration: none;
}

a:hover {
  color: var(--teal);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 64px;
  padding: 0 36px;
  background: rgba(246, 248, 251, 0.94);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(12px);
}

.brand {
  font-size: 18px;
  font-weight: 800;
}

nav {
  display: flex;
  align-items: center;
  gap: 22px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 650;
}

.hero,
.section {
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(420px, 1.1fr);
  gap: 42px;
  align-items: center;
  min-height: calc(100vh - 64px);
  padding: 48px 0 58px;
}

.hero-copy {
  padding: 18px 0;
}

.venue,
.eyebrow,
.dataset {
  margin: 0 0 10px;
  color: var(--teal);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  max-width: 760px;
  font-size: 56px;
  line-height: 1.02;
  letter-spacing: 0;
}

.authors {
  margin: 22px 0 6px;
  color: var(--ink);
  font-size: 17px;
}

.affiliations {
  margin: 0 0 20px;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.5;
}

.link-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.link-row a {
  min-width: 88px;
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink);
  font-weight: 750;
  text-align: center;
}

.hero-media {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  grid-auto-rows: 180px;
  gap: 12px;
}

.hero-panel {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.hero-panel-large {
  grid-row: span 2;
}

.hero-panel img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.hero-panel figcaption {
  position: absolute;
  left: 10px;
  bottom: 10px;
  max-width: calc(100% - 20px);
  padding: 6px 8px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.88);
  color: var(--ink);
  font-size: 12px;
  font-weight: 750;
}

.section {
  padding: 78px 0;
}

.section-tint {
  width: 100%;
  padding-left: max(24px, calc((100% - 1180px) / 2));
  padding-right: max(24px, calc((100% - 1180px) / 2));
  background: var(--surface-soft);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.section-head {
  max-width: 820px;
  margin-bottom: 26px;
}

.section-head h2 {
  margin: 0;
  font-size: 34px;
  line-height: 1.18;
  letter-spacing: 0;
}

.lead {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 17px;
}

.abstract-placeholder,
.abstract-copy {
  min-height: 132px;
  padding: 26px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 18px;
}

.abstract-placeholder {
  display: flex;
  align-items: center;
}

.abstract-copy {
  max-width: 1000px;
  color: var(--ink);
  font-size: 17px;
}

.abstract-placeholder p,
.abstract-copy p {
  margin: 0;
}

.abstract-copy p + p {
  margin-top: 16px;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.metric {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.metric strong {
  display: block;
  color: var(--coral);
  font-size: 32px;
  line-height: 1;
}

.metric span {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 14px;
}

.sample-grid {
  display: grid;
  gap: 22px;
}

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

.video-grid {
  grid-template-columns: repeat(6, minmax(0, 1fr));
}

.video-grid .sample-card {
  grid-column: span 2;
}

.video-grid .sample-card:nth-child(4) {
  grid-column: 2 / span 2;
}

.video-grid .sample-card:nth-child(5) {
  grid-column: 4 / span 2;
}

.sample-card {
  display: flex;
  min-width: 0;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.sample-card:hover {
  transform: translateY(-3px);
  border-color: rgba(42, 122, 120, 0.34);
  box-shadow: var(--shadow-hover);
}

.media-frame {
  flex: 0 0 auto;
  position: relative;
  overflow: hidden;
  background: #111615;
}

.media-frame:not(.xray-grid):not(.terra-strip) > img,
.media-frame > video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame video {
  background: #0d1213;
}

.image-grid .media-frame,
.image-grid .terra-strip,
.image-wide {
  aspect-ratio: 16 / 9;
}

.video-frame {
  aspect-ratio: 16 / 9;
}

.cuhk-frame video {
  object-fit: cover;
}

.xray-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  align-items: stretch;
  justify-items: stretch;
}

.image-grid .media-frame > img {
  object-fit: cover;
}

.image-grid .xray-grid > img {
  min-width: 0;
  min-height: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #080b0c;
}

.terra-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  grid-template-rows: repeat(2, minmax(0, 1fr));
  gap: 1px;
  align-items: stretch;
  justify-items: stretch;
  background: var(--line);
}

.terra-strip figure {
  position: relative;
  margin: 0;
  min-width: 0;
  min-height: 0;
  overflow: hidden;
  background: #111615;
}

.terra-strip img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.terra-strip figcaption {
  position: absolute;
  left: 6px;
  bottom: 6px;
  max-width: calc(100% - 12px);
  padding: 3px 6px;
  border-radius: 5px;
  background: rgba(255, 255, 255, 0.86);
  font-size: 11px;
  font-weight: 750;
  line-height: 1.1;
  white-space: nowrap;
}

.sample-body {
  display: flex;
  flex: 1;
  flex-direction: column;
  padding: 18px;
}

.sample-body h3 {
  margin: 0;
  font-size: 21px;
  line-height: 1.22;
  letter-spacing: 0;
}

.sample-text {
  margin: 10px 0 14px;
  color: var(--muted);
  font-size: 15px;
}

.task-list {
  display: grid;
  gap: 8px;
  margin: 0 0 14px;
}

.task-list div {
  display: grid;
  grid-template-columns: 92px minmax(0, 1fr);
  gap: 12px;
  padding-top: 8px;
  border-top: 1px solid var(--line);
}

.task-list dt {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  text-transform: uppercase;
}

.task-list dd {
  margin: 0;
  font-size: 14px;
}

.sparkline {
  width: 100%;
  height: 74px;
  margin-top: auto;
  border-top: 1px solid var(--line);
}

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

.source-entry {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.source-entry h3 {
  margin: 0;
  padding: 16px 18px;
  border-bottom: 1px solid var(--line);
  font-size: 18px;
}

.source-list {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.source-list li {
  display: grid;
  grid-template-columns: 170px minmax(0, 1fr);
  gap: 16px;
  padding: 13px 18px;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
}

.source-list li:last-child {
  border-bottom: 0;
}

.source-list strong {
  color: var(--ink);
}

.source-list a {
  color: var(--teal);
  font-weight: 700;
  word-break: break-word;
}

.bibtex-block {
  position: relative;
  max-width: 1000px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

.bibtex-block pre {
  margin: 0;
  padding: 20px 22px;
  overflow-x: auto;
  font-family: "SFMono-Regular", Menlo, Consolas, monospace;
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink);
}

.copy-button {
  position: absolute;
  top: 12px;
  right: 12px;
  padding: 5px 12px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--surface-soft);
  color: var(--teal);
  font: inherit;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
}

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

.footer {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  width: min(1180px, calc(100% - 48px));
  margin: 0 auto;
  padding: 28px 0 42px;
  border-top: 1px solid var(--line);
  color: var(--muted);
}

.footer p {
  margin: 0;
}

.footer a {
  font-weight: 750;
}

@media (max-width: 1040px) {
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .hero h1 {
    font-size: 46px;
  }

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

  .video-grid .sample-card,
  .video-grid .sample-card:nth-child(4),
  .video-grid .sample-card:nth-child(5) {
    grid-column: auto;
  }
}

@media (max-width: 900px) {
  .image-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .topbar {
    position: static;
    align-items: flex-start;
    flex-direction: column;
    padding: 16px 20px;
  }

  nav {
    flex-wrap: wrap;
    gap: 12px 16px;
  }

  .hero,
  .section,
  .footer {
    width: min(100% - 32px, 1180px);
  }

  .hero {
    padding-top: 32px;
  }

  .hero h1 {
    font-size: 34px;
  }

  .hero-media {
    grid-template-columns: 1fr;
    grid-auto-rows: 190px;
  }

  .hero-panel-large {
    grid-row: span 1;
  }

  .section {
    padding: 52px 0;
  }

  .section-tint {
    padding-left: 16px;
    padding-right: 16px;
  }

  .section-head h2 {
    font-size: 27px;
  }

  .metric-grid,
  .image-grid,
  .video-grid {
    grid-template-columns: 1fr;
  }

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

  .task-list div {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .source-list li {
    grid-template-columns: 1fr;
    gap: 4px;
  }
}