:root {
  --page: #f9fafb;
  --surface: #ffffff;
  --soft: #f5f4f0;
  --soft-2: #f8f8f8;
  --text: #262626;
  --muted: #6a6a6a;
  --line: rgba(0, 0, 0, 0.12);
  --line-soft: #e8e8e8;
  --yellow: #ffce44;
  --green: #5fbf6f;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--page);
  color: var(--text);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  letter-spacing: 0;
}

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

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

button {
  font: inherit;
}

a {
  color: inherit;
}

.hero {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 64px 32px 36px;
  background: var(--page);
}

.hero-shell {
  width: min(1248px, 100%);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-copy {
  text-align: center;
}

h1,
h2,
h3,
p,
figure {
  margin: 0;
}

h1 {
  max-width: 1050px;
  margin: 0 auto;
  color: var(--text);
  font-size: clamp(28px, 4.9vw, 48px);
  font-weight: 500;
  line-height: 1.12;
  letter-spacing: 0;
}

.title-break {
  display: block;
}

.hero-authors {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 4px 18px;
  max-width: 900px;
  margin: 22px auto 0;
  color: #555;
  font-size: 15px;
  line-height: 1.5;
}

.hero-authors a {
  color: #444;
  text-decoration: none;
}

.hero-authors a:hover,
.hero-authors a:focus-visible {
  color: #111;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin: 28px auto 0;
}

.nav-button {
  min-height: 38px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 24px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--text);
  font-size: 16px;
  font-weight: 400;
  line-height: 1;
  text-decoration: none;
  transition: background 0.25s ease, border-color 0.25s ease, color 0.25s ease;
}

.nav-button:hover,
.nav-button:focus-visible {
  background: #eff1f9;
  border-color: transparent;
  outline: none;
}

.nav-button.disabled {
  color: #8b8b8b;
  cursor: default;
  pointer-events: none;
}

.single-video-container video,
.video-comparison-item video {
  width: 100%;
  display: block;
}

.intro-text {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 20px;
  color: var(--muted);
  font-size: 16px;
  line-height: 24px;
  text-align: left;
}

#results .intro-text {
  margin-top: 24px;
}

.feature-section {
  max-width: 1400px;
  margin: 0 auto;
  padding: 80px 20px;
}

.section-title {
  margin-bottom: 40px;
  color: var(--text);
  font-size: clamp(28px, 4vw, 40px);
  font-weight: 500;
  line-height: 1.4;
  text-align: center;
}

.section-description {
  max-width: 800px;
  margin: 0 auto 40px;
  color: var(--muted);
  font-size: 16px;
  line-height: 24px;
  text-align: left;
}

.video-carousel-side {
  position: relative;
  max-width: 900px;
  margin: 0 auto;
}

.carousel-sidebar {
  position: absolute;
  right: calc(100% + 24px);
  top: 0;
  width: 240px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.sidebar-category {
  padding: 8px;
  border-radius: 8px;
  background: var(--soft-2);
}

.sidebar-category-title {
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.03em;
  line-height: 1.2;
  text-transform: uppercase;
}

.sidebar-thumb {
  width: 100%;
  display: block;
  overflow: hidden;
  padding: 0;
  border: 2px solid transparent;
  border-radius: 6px;
  background: transparent;
  cursor: pointer;
  opacity: 0.72;
  text-align: inherit;
  transition: border-color 0.25s ease, opacity 0.25s ease, transform 0.25s ease, box-shadow 0.25s ease;
}

.sidebar-thumb:hover,
.sidebar-thumb:focus-visible {
  opacity: 0.95;
  outline: none;
  transform: scale(1.01);
}

.sidebar-thumb.active {
  border-color: var(--yellow);
  opacity: 1;
  box-shadow: 0 4px 12px rgba(255, 206, 68, 0.3);
}

.sidebar-thumb video {
  width: 100%;
  aspect-ratio: 16 / 9;
  display: block;
  object-fit: cover;
  pointer-events: none;
}

.sidebar-thumb-label {
  display: block;
  padding: 6px 4px;
  background: #f0f0f0;
  color: #666;
  font-size: 12px;
  line-height: 1.2;
  text-align: center;
  white-space: nowrap;
}

.sidebar-thumb.active .sidebar-thumb-label {
  background: #e8e8e8;
  color: #333;
  font-weight: 600;
}

.carousel-main-side,
.single-video-container {
  overflow: hidden;
  border-radius: 12px;
  background: #1a1a1a;
  box-shadow: var(--shadow);
}

.carousel-main-side video {
  width: 100%;
  aspect-ratio: 16 / 9;
  display: block;
  object-fit: cover;
}

.video-caption {
  min-height: 42px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 8px 16px;
  background: #eee;
  color: #555;
  font-size: 14px;
  font-weight: 600;
  line-height: 1.35;
  text-align: center;
}

.single-video-container {
  max-width: 900px;
  margin: 0 auto;
}

.single-video-container video {
  height: auto;
  aspect-ratio: auto;
  object-fit: contain;
}

.chart-container {
  max-width: 900px;
  margin: 50px auto 0;
  padding: 30px;
  border-radius: 12px;
  background: var(--soft);
}

#results .chart-container {
  margin-top: 0;
}

.chart-label {
  margin-bottom: 24px;
  color: #1a1a1a;
  font-size: 20px;
  font-weight: 500;
  line-height: 1.3;
  text-align: center;
}

.chart-figure {
  overflow: hidden;
  border-radius: 8px;
  background: #fff;
}

.chart-figure.narrow {
  max-width: 760px;
  margin: 0 auto;
}

.chart-figure img {
  width: 100%;
  display: block;
}

.native-curves {
  display: grid;
  gap: 16px;
}

.curve-top-legend {
  justify-self: center;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 22px;
  padding: 8px 14px;
  border: 1px solid #bbb;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.96);
  color: #333;
  font: 700 14px -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.curve-top-legend span {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.legend-line {
  width: 32px;
  height: 0;
  display: inline-block;
  border-top: 3px solid;
}

.legend-line-base {
  border-color: #5b7db1;
}

.legend-line-ours {
  border-color: #e0654e;
}

.legend-dot {
  position: absolute;
  left: 13px;
  width: 9px;
  height: 9px;
  background: #fff;
}

.legend-dot-base {
  border: 2px solid #5b7db1;
  border-radius: 50%;
}

.legend-dot-ours {
  border: 1.5px solid #fff;
  border-radius: 2px;
  background: #e0654e;
}

.curve-panel-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.native-curves-fvd {
  max-width: 780px;
  margin: 0 auto;
}

.native-curves-fvd .curve-panel-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.curve-panel {
  width: 100%;
  display: block;
  overflow: visible;
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  background: #fff;
  color: #333;
  font-family: Georgia, "Times New Roman", serif;
}

.curve-title {
  fill: #1f1f1f;
  font-size: 13px;
  font-weight: 700;
  text-anchor: middle;
}

.fvd-curve-title {
  font-weight: 500;
}

.curve-grid-line {
  stroke: #d9d9d9;
  stroke-width: 0.8;
}

.curve-axis {
  stroke: #444;
  stroke-width: 1;
}

.curve-x-tick {
  stroke: #666;
  stroke-width: 0.8;
}

.curve-y-tick {
  fill: #666;
  font-size: 11px;
  text-anchor: end;
}

.curve-x-label {
  fill: #666;
  font-size: 11px;
  text-anchor: middle;
}

.curve-axis-label-x,
.curve-axis-label-y {
  fill: #333;
  font-size: 12px;
  text-anchor: middle;
}

.curve-gap {
  fill: rgba(224, 101, 78, 0.11);
}

.curve-line-base,
.curve-line-ours {
  fill: none;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.curve-line-base {
  stroke: #5b7db1;
  stroke-width: 2.4;
}

.curve-line-ours {
  stroke: #e0654e;
  stroke-width: 2.7;
}

.curve-marker-base {
  fill: #fff;
  stroke: #5b7db1;
  stroke-width: 1.5;
}

.curve-marker-ours {
  fill: #e0654e;
  stroke: #fff;
  stroke-width: 1.2;
}

.curve-annotation line,
.curve-annotation path {
  fill: #2f2f2f;
  stroke: #2f2f2f;
  stroke-width: 1.1;
}

.curve-annotation rect {
  fill: rgba(255, 255, 255, 0.96);
  stroke: #2f2f2f;
  stroke-width: 0.8;
}

.curve-annotation text {
  fill: #2f2f2f;
  font: 700 9.5px -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  text-anchor: middle;
}

.metric-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 24px;
}

.metric-row div {
  min-height: 96px;
  padding: 16px;
  border: 1px solid rgba(0, 0, 0, 0.08);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.62);
  text-align: center;
}

.metric-row strong {
  display: block;
  color: #1a1a1a;
  font-size: 24px;
  font-weight: 600;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.metric-row span {
  display: block;
  margin-top: 8px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.35;
}

.howitworks-content {
  max-width: 900px;
  margin: 0 auto;
}

.howitworks-subsection {
  margin-bottom: 60px;
}

.howitworks-subsection:last-child {
  margin-bottom: 0;
}

.howitworks-subtitle {
  margin-bottom: 16px;
  padding-left: 12px;
  border-left: 3px solid var(--yellow);
  color: #1a1a1a;
  font-size: 20px;
  font-weight: 500;
  line-height: 1.35;
}

.howitworks-text {
  margin-bottom: 24px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.8;
}

.method-figure {
  overflow: hidden;
  border-radius: 0;
  background: transparent;
}

.method-figure img {
  width: 100%;
  display: block;
}

.general-comparison-list {
  max-width: 900px;
  margin: 42px auto 0;
  display: grid;
  gap: 44px;
}

.general-case {
  padding-top: 34px;
  border-top: 1px solid var(--line-soft);
}

.general-case:first-child {
  padding-top: 0;
  border-top: 0;
}

.video-comparison {
  display: flex;
  gap: 20px;
}

.video-comparison-item {
  flex: 1;
  overflow: hidden;
  border-radius: 12px;
  background: #f5f5f5;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.video-comparison-label {
  min-height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6px 16px;
  background: #eee;
  color: #666;
  font-size: 13px;
  font-weight: 600;
  line-height: 1.25;
  text-align: center;
}

.video-comparison-label.ours-label {
  background: #ffefaa;
  color: #1a1a1a;
}

.video-comparison-item video {
  height: auto;
  aspect-ratio: auto;
  object-fit: contain;
}

.prompt-text {
  max-width: 860px;
  margin: 14px auto 0;
  color: #777;
  font-size: 13px;
  line-height: 1.55;
  text-align: left;
}

.citation-section {
  padding-bottom: 96px;
}

.citation-panel {
  max-width: 900px;
  margin: 0 auto;
  padding: 24px;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  border-radius: 12px;
  background: var(--soft);
}

.citation-panel pre {
  margin: 0;
  overflow-x: auto;
}

.citation-panel code {
  color: #333;
  font: 14px/1.65 "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  white-space: pre;
}

.footer {
  padding: 30px 20px;
  border-top: 1px solid var(--line-soft);
  background: var(--surface);
  color: var(--muted);
  font-size: 14px;
  text-align: center;
}

@media (max-width: 1200px) {
  .video-carousel-side {
    max-width: 700px;
  }

  .carousel-sidebar {
    position: static;
    width: 100%;
    flex-direction: row;
    flex-wrap: wrap;
    justify-content: center;
    gap: 15px;
    margin-bottom: 20px;
  }

  .sidebar-category {
    flex: 0 1 250px;
  }
}

@media (max-width: 768px) {
  .hero {
    padding: 40px 20px 28px;
  }

  .hero-links {
    gap: 10px;
    margin-bottom: 0;
  }

  .nav-button {
    min-height: 42px;
    padding: 12px 18px;
    font-size: 14px;
  }

  .intro-text {
    margin-top: 0;
    font-size: 14px;
  }

  .feature-section {
    padding: 56px 20px;
  }

  .section-title {
    margin-bottom: 24px;
    line-height: 1.25;
  }

  .section-description {
    margin-bottom: 30px;
    font-size: 14px;
  }

  .carousel-sidebar {
    flex-wrap: nowrap;
    justify-content: flex-start;
    overflow-x: auto;
    padding-bottom: 8px;
    -webkit-overflow-scrolling: touch;
  }

  .sidebar-category {
    flex: 0 0 170px;
    padding: 10px;
    border: 1px solid #eee;
    background: #fff;
  }

  .chart-container {
    margin-top: 36px;
    padding: 20px;
  }

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

  .metric-row {
    grid-template-columns: 1fr;
  }

  .video-comparison {
    flex-direction: column;
  }

  .prompt-text {
    font-size: 12px;
  }
}

@media (max-width: 520px) {
  .hero {
    padding-left: 14px;
    padding-right: 14px;
  }

  .hero-authors {
    font-size: 14px;
    gap: 3px 12px;
  }

  .hero-links {
    width: 100%;
  }

  .nav-button {
    flex: 1 1 120px;
  }

  .feature-section {
    padding-left: 14px;
    padding-right: 14px;
  }

  .chart-container {
    padding: 16px;
  }

  .curve-panel-grid {
    grid-template-columns: 1fr;
  }

  .native-curves-fvd .curve-panel-grid {
    grid-template-columns: 1fr;
  }

  .citation-panel {
    padding: 18px;
  }

  .method-figure {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }

  .method-figure img {
    width: 680px;
    max-width: none;
  }
}