:root {
  --ink: #17212b;
  --muted: #5b6876;
  --line: #dce3e8;
  --surface: #ffffff;
  --surface-soft: #ffffff;
  --accent: #315f7d;
  --accent-dark: #21465f;
  --precise: #c84d58;
  --precise-soft: #fff1f2;
  --agile: #27836a;
  --agile-soft: #edf8f4;
  --ours: #eef5f7;
  --shadow: none;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 1rem;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--surface);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
}

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

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

.shell {
  width: min(1100px, calc(100% - 2.5rem));
  margin-inline: auto;
}

.narrow {
  width: min(920px, calc(100% - 2.5rem));
}

.narrow-wide {
  width: min(1040px, calc(100% - 2.5rem));
}

.hero {
  padding: 3.8rem 0 2.6rem;
  text-align: center;
}

.eyebrow,
.kicker {
  margin: 0 0 0.65rem;
  color: var(--accent);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 930px;
  margin: 0 auto;
  font-size: clamp(2rem, 3.8vw, 3rem);
  line-height: 1.16;
  letter-spacing: -0.025em;
}

.authors {
  margin: 1.35rem 0 0;
  color: var(--ink);
  font-size: 1.08rem;
  font-weight: 650;
}

.lead {
  max-width: 780px;
  margin: 1.1rem auto 0;
  color: var(--muted);
  font-size: 1rem;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  margin-top: 1.7rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 110px;
  padding: 0.68rem 1.2rem;
  border: 1px solid var(--line);
  border-radius: 4px;
  font-weight: 750;
  text-decoration: none;
  transition: transform 140ms ease, background 140ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button.primary {
  color: white;
  border-color: var(--accent-dark);
  background: var(--accent-dark);
}

.button.secondary {
  background: white;
}

.section {
  padding: 3.5rem 0;
}

.section-tint {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--surface-soft);
}

.section-heading {
  max-width: 820px;
  margin-bottom: 2rem;
}

.section-heading.centered {
  margin-right: 0;
  margin-left: 0;
  text-align: left;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(1.8rem, 3vw, 2.55rem);
  line-height: 1.17;
  letter-spacing: -0.025em;
}

.section-heading p:last-child {
  margin: 0.85rem 0 0;
  color: var(--muted);
}

.teaser-section {
  padding-top: 0;
}

.media-frame {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: #0e141a;
  box-shadow: var(--shadow);
}

.media-frame video {
  width: 100%;
  max-height: 620px;
}

.overview-placeholder {
  aspect-ratio: 16 / 9;
  position: relative;
  background: #fff;
}

.overview-placeholder img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.media-note {
  max-width: 740px;
  margin: 0.9rem auto 0;
  color: var(--muted);
  text-align: center;
  font-size: 0.92rem;
}

.abstract-text {
  margin: 0;
  color: #2a3641;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1.06rem;
  line-height: 1.82;
  text-align: justify;
}

.paper-figure {
  margin: 2rem auto 0;
}

.paper-figure img {
  width: 100%;
  border-radius: 0;
  background: white;
}

.paper-figure figcaption,
.failure-card figcaption {
  margin-top: 0.75rem;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.5;
}

.wide-figure {
  max-width: 1100px;
}

.compact-figure {
  max-width: 1050px;
}

.method-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.2rem;
}

.method-card {
  position: relative;
  overflow: hidden;
  min-height: 230px;
  padding: 1.65rem;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: white;
  box-shadow: none;
}

.precise-card::before,
.agile-card::before {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  content: "";
}

.precise-card::before {
  background: var(--precise);
}

.agile-card::before {
  background: var(--agile);
}

.method-card h3 {
  margin: 0.95rem 0 0.55rem;
  font-size: 1.2rem;
  line-height: 1.3;
}

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

.method-label {
  display: inline-flex;
  padding: 0.28rem 0.68rem;
  border-radius: 3px;
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.precise-label {
  color: #97313c;
  background: var(--precise-soft);
}

.agile-label {
  color: #1d6a56;
  background: var(--agile-soft);
}

.qualitative-figure {
  max-width: 1080px;
  margin-top: 2.2rem;
}

.table-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: white;
  box-shadow: none;
}

.table-caption {
  min-height: 4.4rem;
  padding: 1rem 1.15rem 0.9rem;
  border-bottom: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.83rem;
  line-height: 1.45;
}

.table-caption strong {
  color: var(--ink);
}

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

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.79rem;
  font-variant-numeric: tabular-nums;
  line-height: 1.35;
}

.simulation-table {
  min-width: 1020px;
}

.real-table {
  min-width: 650px;
  font-size: 0.72rem;
}

.real-table th,
.real-table td,
.collection-card .data-table th,
.collection-card .data-table td {
  padding: 0.48rem 0.34rem;
}

.data-table th,
.data-table td {
  padding: 0.58rem 0.55rem;
  border-bottom: 1px solid #e7ecef;
  text-align: center;
  white-space: nowrap;
}

.data-table th {
  color: #33414e;
  background: #f7f9fa;
  font-weight: 750;
}

.data-table tbody tr:last-child td {
  border-bottom: 0;
}

.data-table .group-start td,
.group-start td {
  border-top: 1.5px solid #aeb9c1;
}

.data-table .ours td,
.ours-cell,
.ours-head {
  background: var(--ours) !important;
}

.video-panel {
  margin-top: 2rem;
  padding: 1.25rem 0 0;
  border-top: 1px solid var(--line);
  background: white;
}

.video-panel-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1.5rem;
}

.video-panel h3 {
  margin: 0;
  font-size: 1.22rem;
}

.video-panel-header p {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.control-groups,
.control-group,
.task-tabs {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  flex-wrap: wrap;
}

.control-groups {
  justify-content: flex-end;
  gap: 1rem;
}

.control-group > span {
  margin-right: 0.2rem;
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 750;
  text-transform: uppercase;
}

.chip,
.task-tab {
  appearance: none;
  padding: 0.46rem 0.78rem;
  border: 1px solid #cfd8de;
  border-radius: 3px;
  color: #44515d;
  background: white;
  cursor: pointer;
  font: inherit;
  font-size: 0.79rem;
  font-weight: 700;
}

.chip:hover:not(:disabled),
.task-tab:hover,
.chip.active,
.task-tab.active {
  color: white;
  border-color: var(--accent);
  background: var(--accent);
}

.chip:disabled {
  cursor: not-allowed;
  opacity: 0.4;
}

.task-tabs {
  margin: 1.15rem 0;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

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

.video-card {
  overflow: hidden;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: #10161b;
}

.video-card figcaption {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.62rem 0.8rem;
  color: var(--ink);
  background: white;
  font-size: 0.88rem;
}

.video-card video {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: contain;
  background: #10161b;
}

.legend-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
}

.tsd-dot {
  background: var(--accent);
}

.full-dot {
  background: #8a969f;
}

.real-table-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.9fr) minmax(340px, 1fr);
  gap: 1rem;
}

.collection-card .data-table {
  min-width: 0;
  font-size: 0.72rem;
}

.failure-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.2rem;
}

.failure-card {
  margin: 0;
  padding: 0.9rem;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: white;
}

.failure-card img {
  width: 100%;
  border-radius: 0;
}

.three-table-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 1.2rem;
}

.compact-table {
  font-size: 0.73rem;
}

.subsection-block,
.analysis-block {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
}

.subsection-block h3,
.analysis-block h3 {
  margin: 0 0 0.45rem;
  font-size: 1.35rem;
}

.subsection-block > p,
.analysis-block > p {
  max-width: 820px;
  margin: 0 0 1.3rem;
  color: var(--muted);
}

.selector-row {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex-wrap: wrap;
  margin: 1rem 0;
}

.selector-row label,
.arm-controls > span {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 750;
  text-transform: uppercase;
}

.selector-row select {
  min-width: 170px;
  padding: 0.5rem 2rem 0.5rem 0.65rem;
  border: 1px solid #cbd5db;
  border-radius: 3px;
  color: var(--ink);
  background: white;
  font: inherit;
  font-size: 0.84rem;
}

.arm-controls {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-left: 0.45rem;
}

.arm-controls[hidden] {
  display: none;
}

.detection-viewer {
  max-width: 900px;
  margin: 1.2rem auto 0;
  text-align: center;
}

.detection-viewer img {
  width: 100%;
  max-height: 620px;
  object-fit: contain;
}

.detection-viewer figcaption,
.single-video-card figcaption {
  margin-top: 0.55rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.centered-table {
  max-width: 860px;
  margin-right: auto;
  margin-left: auto;
}

.ablation-video-panel {
  max-width: 860px;
  margin: 1.5rem auto 0;
  padding-top: 1.3rem;
  border-top: 1px solid var(--line);
}

.ablation-video-panel h4 {
  margin: 0;
  font-size: 1.05rem;
}

.single-video-card {
  max-width: 720px;
  margin: 1rem auto 0;
  text-align: center;
}

.single-video-card video {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: contain;
  background: #111820;
}

.convergence-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.figure-placeholder {
  min-height: 260px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  border: 1px dashed #aeb8bf;
  color: #566571;
  background: #fafbfb;
  text-align: center;
}

.figure-placeholder span {
  font-weight: 700;
}

.figure-placeholder small {
  margin-top: 0.25rem;
  color: #7a8790;
}

.efficiency-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(410px, 1fr);
  gap: 1rem;
}

.training-table-card .data-table {
  font-size: 0.74rem;
}

.training-table-card .data-table th,
.training-table-card .data-table td {
  padding-right: 0.38rem;
  padding-left: 0.38rem;
}

.curation-table-card .table-scroll {
  overflow-x: visible;
}

.curation-table-card .data-table {
  table-layout: fixed;
  min-width: 0;
  font-size: 0.72rem;
}

.curation-table-card .data-table th,
.curation-table-card .data-table td {
  padding-right: 0.34rem;
  padding-left: 0.34rem;
  white-space: normal;
}

.curation-table-card .data-table th:nth-child(1) { width: 18%; }
.curation-table-card .data-table th:nth-child(2) { width: 34%; }
.curation-table-card .data-table th:nth-child(3) { width: 22%; }
.curation-table-card .data-table th:nth-child(4) { width: 26%; }

.footer {
  padding: 2rem 0;
  color: #71808c;
  background: #18232c;
  text-align: center;
  font-size: 0.82rem;
}

.footer p {
  margin: 0;
}

.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;
}

@media (max-width: 920px) {
  .real-table-grid,
  .efficiency-grid {
    grid-template-columns: 1fr;
  }

  .three-table-grid {
    grid-template-columns: 1fr 1fr;
  }

  .video-panel-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .control-groups {
    justify-content: flex-start;
  }
}

@media (max-width: 680px) {
  .shell,
  .narrow,
  .narrow-wide {
    width: min(100% - 1.3rem, 1180px);
  }

  .hero {
    padding: 3rem 0 2.3rem;
  }

  .hero h1 {
    font-size: 1.9rem;
  }

  .section {
    padding: 3.5rem 0;
  }

  .method-grid,
  .video-compare,
  .failure-grid,
  .three-table-grid,
  .convergence-grid {
    grid-template-columns: 1fr;
  }

  .abstract-text {
    font-size: 1rem;
    text-align: left;
  }

  .video-panel {
    padding: 0.85rem;
  }

  .table-caption {
    min-height: 0;
  }
}

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

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