:root {
  --background: #ffffff;
  --surface: #f5f8f6;
  --surface-strong: #e8f0eb;
  --text: #17211b;
  --muted: #647069;
  --border: #d8e2dc;
  --accent: #17683d;
  --accent-bright: #2b8a57;
  --shadow: 0 18px 50px rgba(25, 54, 37, 0.1);
  --radius: 22px;
  --content-width: 1120px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

a:hover {
  color: var(--accent-bright);
}

button,
video {
  font: inherit;
}

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 100;
  padding: 10px 14px;
  border-radius: 10px;
  background: var(--text);
  color: #fff;
  transform: translateY(-180%);
}

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

.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  padding: 0 max(24px, calc((100vw - var(--content-width)) / 2));
  border-bottom: 1px solid rgba(216, 226, 220, 0.8);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(18px);
}

.brand {
  color: var(--text);
  font-size: 1.02rem;
  font-weight: 750;
  letter-spacing: -0.02em;
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 24px;
}

.nav-links a {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
}

.nav-links a:hover {
  color: var(--accent);
}

.hero {
  padding: clamp(72px, 9vw, 124px) 24px clamp(64px, 8vw, 108px);
  overflow: hidden;
  background:
    radial-gradient(circle at 18% 10%, rgba(43, 138, 87, 0.13), transparent 32%),
    radial-gradient(circle at 82% 70%, rgba(23, 104, 61, 0.09), transparent 36%),
    linear-gradient(180deg, #f7fbf8 0%, #ffffff 100%);
  text-align: center;
}

.hero-content {
  width: min(920px, 100%);
  margin: 0 auto;
}

.eyebrow,
.section-kicker {
  margin: 0 0 12px;
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  font-size: clamp(2.5rem, 6vw, 4.9rem);
  font-weight: 780;
  letter-spacing: -0.055em;
  line-height: 1.03;
}

.authors {
  display: flex;
  justify-content: center;
  gap: 13px;
  margin: 30px 0 2px;
  font-size: 1.15rem;
  font-weight: 650;
}

.authors a {
  text-decoration: none;
}

.affiliation {
  margin: 0;
  color: var(--muted);
  font-size: 1rem;
}

.project-links {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 30px;
}

.project-link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  min-width: 170px;
  justify-content: center;
  padding: 11px 18px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.75);
  color: var(--text);
  font-weight: 700;
  text-decoration: none;
}

.section {
  padding: clamp(72px, 9vw, 112px) 24px;
}

.section-heading {
  width: min(720px, 100%);
  margin: 0 auto 42px;
  text-align: center;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.2rem);
  letter-spacing: -0.04em;
  line-height: 1.1;
}

.section-heading > p:last-child {
  margin: 14px 0 0;
  color: var(--muted);
}

.highlights-section {
  width: min(1400px, 100%);
  margin: 0 auto;
}

.highlight-gallery {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.highlight-card {
  position: relative;
  aspect-ratio: 8 / 5;
  width: 100%;
  padding: 0;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: #dce5df;
  box-shadow: 0 8px 24px rgba(25, 54, 37, 0.08);
  cursor: pointer;
}

.highlight-card:focus-visible {
  outline: 3px solid rgba(43, 138, 87, 0.45);
  outline-offset: 3px;
}

.highlight-card video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  transition: opacity 220ms ease;
}

.highlight-card .baseline-video {
  opacity: 0;
}

.highlight-card.is-flipped .result-video {
  opacity: 0;
}

.highlight-card.is-flipped .baseline-video {
  opacity: 1;
}

.video-label {
  position: absolute;
  top: 10px;
  left: 10px;
  z-index: 2;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(16, 25, 19, 0.76);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 750;
  letter-spacing: 0.02em;
  pointer-events: none;
}

.video-label::after {
  content: "After";
}

.highlight-card.is-flipped .video-label::after {
  content: "Before";
}

.abstract-section {
  background: var(--surface);
}

.abstract-copy {
  width: min(850px, 100%);
  margin: 0 auto;
  color: #2f3a33;
  font-size: clamp(1rem, 1.6vw, 1.12rem);
  line-height: 1.85;
  text-align: justify;
}

.results-section.alternate {
  background: var(--surface);
}

.results-list {
  display: grid;
  gap: 32px;
  width: min(var(--content-width), 100%);
  margin: 0 auto;
}

.comparison-card {
  padding: clamp(20px, 4vw, 34px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--background);
  box-shadow: var(--shadow);
}

.comparison-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 22px;
}

.comparison-header h3 {
  margin: 0;
  font-size: clamp(1.35rem, 2.5vw, 1.85rem);
  letter-spacing: -0.025em;
  text-align: center;
}

.comparison-samples {
  display: grid;
  gap: 28px;
}

.comparison-samples.is-two-up {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.comparison-samples.is-two-up.has-single-sample {
  grid-template-columns: minmax(0, calc(50% - 14px));
  justify-content: center;
}

.sample-pair {
  min-width: 0;
}

.sample-pair[hidden] {
  display: none;
}

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

.comparison-card.is-multi-sample .comparison-media {
  gap: 10px;
}

.video-panel {
  position: relative;
  margin: 0;
  overflow: hidden;
  border-radius: 15px;
  background: #dce5df;
}

.video-panel video {
  display: block;
  width: 100%;
  aspect-ratio: var(--video-aspect-ratio);
  background: #dce5df;
  object-fit: contain;
}

.panel-label {
  position: absolute;
  top: 10px;
  left: 10px;
  z-index: 2;
  padding: 5px 11px;
  border-radius: 999px;
  background: rgba(16, 25, 19, 0.76);
  color: #fff;
  font-size: 0.74rem;
  font-weight: 750;
}

.panel-label.after {
  background: rgba(23, 104, 61, 0.9);
}

.prompt {
  min-height: 2.8em;
  margin: 20px auto 14px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(1rem, 2vw, 1.16rem);
  font-style: italic;
  text-align: center;
}

.comparison-card.is-multi-sample .prompt {
  margin: 14px auto 8px;
  font-size: clamp(0.9rem, 1.35vw, 1.04rem);
}

.carousel-controls {
  display: grid;
  grid-template-columns: 42px 1fr 42px;
  align-items: center;
  gap: 14px;
  margin-top: 8px;
}

.carousel-button,
.dot-button {
  border: 0;
  cursor: pointer;
}

.carousel-button {
  width: 42px;
  height: 42px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--background);
  color: var(--text);
  font-size: 1.3rem;
  line-height: 1;
}

.carousel-button:hover,
.carousel-button:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
}

.dots {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
}

.dot-button {
  width: 8px;
  height: 8px;
  padding: 0;
  border-radius: 50%;
  background: #bec9c2;
}

.dot-button[aria-current="true"] {
  width: 22px;
  border-radius: 999px;
  background: var(--accent);
}

.site-footer {
  padding: 34px 24px 54px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.88rem;
  text-align: center;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 900px) {
  .highlight-gallery {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .site-nav {
    min-height: 56px;
    padding-inline: 16px;
  }

  .nav-links {
    gap: 13px;
  }

  .nav-links a {
    font-size: 0.74rem;
  }

  .hero {
    padding-inline: 18px;
  }

  .hero h1 {
    font-size: clamp(2.25rem, 12vw, 3.25rem);
  }

  .project-links {
    flex-direction: column;
    align-items: center;
  }

  .project-link {
    width: min(260px, 100%);
  }

  .section {
    padding: 64px 16px;
  }

  .highlight-gallery {
    gap: 10px;
  }

  .comparison-card {
    border-radius: 18px;
  }

  .comparison-media {
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .comparison-samples.is-two-up,
  .comparison-samples.is-two-up.has-single-sample {
    grid-template-columns: 1fr;
  }

  .comparison-card.is-multi-sample .comparison-media {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 8px;
  }

  .abstract-copy {
    text-align: left;
  }
}

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

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