:root {
  --bg: #F5F7F9;
  --surface: #FFFFFF;
  --surface-soft: #EEF3F6;
  --ink: #14212B;
  --muted: #5C6B76;
  --line: #D9E2E8;
  --brand: #2B624E;
  --brand-dark: #1D4437;
  --brand-soft: #E7F0EA;
  --accent: #7C9D86;
  --shadow: 0 14px 40px rgba(20, 33, 43, .08);
  --radius: 22px;
}

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(33, 79, 120, .08), transparent 32%),
    radial-gradient(circle at top right, rgba(201, 108, 119, .08), transparent 28%),
    var(--bg);
  font-family: "Noto Sans", sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

* { box-sizing: border-box; }

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

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

button { font: inherit; }

.container {
  width: min(100% - 32px, 1024px);
  margin: 0 auto;
}

.is-max-desktop { max-width: 1024px; }
.has-text-centered { text-align: center; }

.title { margin: 0; color: #10202E; }

.hero-landing {
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, .94), rgba(245, 247, 249, .98)),
    var(--bg);
}

.hero-landing::before {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 180px;
  background: linear-gradient(90deg, transparent 0%, rgba(33, 79, 120, .06) 20%, transparent 40%, rgba(33, 79, 120, .05) 60%, transparent 80%);
  mask-image: linear-gradient(to top, black, transparent);
  pointer-events: none;
}

.hero-body {
  position: relative;
  padding: 5rem 0 3.8rem;
}

.landing-copy,
.paper-card,
.results-note {
  border: 1px solid rgba(217, 226, 232, .9);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, .82);
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.landing-copy {
  padding: 2rem 2.2rem;
}

.landing-copy-wide {
  max-width: 1040px;
  margin: 0 auto;
  padding: 2rem 2.35rem;
}

.eyebrow,
.card-label,
.highlight-kicker,
.tldr-label {
  color: var(--brand);
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.publication-venue-label {
  margin: 0 0 .5rem;
  font-size: .96rem;
  letter-spacing: .14em;
}

.publication-title {
  margin: .5rem auto .8rem;
  max-width: 900px;
  font-family: "Castoro", Georgia, serif;
  font-size: clamp(1.7rem, 2.65vw, 2.75rem);
  font-weight: 400;
  line-height: 1.12;
}

.landing-summary {
  color: var(--muted);
  font-size: 1.02rem;
  line-height: 1.68;
}

.landing-summary-wide {
  max-width: 860px;
  margin: 0 auto;
  font-size: 1.08rem;
}

.hero-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: .8rem;
  margin-top: 1rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: .55rem 1.1rem;
  border: 1px solid var(--line);
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform .2s ease, background .2s ease, border-color .2s ease, color .2s ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-1px);
  border-color: var(--brand);
}

.landing-copy .button {
  gap: .55rem;
}

.landing-copy .button .icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.15em;
  margin: 0;
}

.landing-copy .button .icon i {
  font-size: 1.05em;
  line-height: 1;
}

.is-rounded { border-radius: 999px; }

.button.is-dark {
  border-color: var(--brand-dark);
  background: var(--brand-dark);
  color: #F8FCF9;
}

.button.is-dark:hover,
.button.is-dark:focus-visible { background: var(--brand); }

.button.is-light {
  background: var(--surface);
  color: var(--brand-dark);
}

.button-placeholder,
.button-placeholder:disabled {
  border-color: #D9E2E8;
  background: #E8EDF0;
  color: #6B7780;
  cursor: default;
  opacity: 1;
  pointer-events: none;
}

.tldr-card {
  margin-top: 1.2rem;
  padding: 1rem 1.1rem 1.05rem;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, .76);
}

.tldr-label { margin: 0 0 .35rem; }

.tldr-text {
  margin: 0;
  color: var(--ink);
  font-family: "Google Sans", sans-serif;
  font-size: 1rem;
  line-height: 1.6;
}

.hero-tags {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: .65rem;
  margin-top: .95rem;
}

.hero-tag,
.method-pill {
  padding: .45rem .8rem;
  border-radius: 999px;
  background: var(--brand-soft);
  color: var(--brand-dark);
  font-size: .9rem;
  font-weight: 700;
}

.section {
  padding-top: 4rem;
  padding-bottom: 4rem;
}

.section-tight {
  padding-top: 2.5rem;
  padding-bottom: 3rem;
}

.section-soft {
  border-top: 1px solid rgba(217, 226, 232, .72);
  border-bottom: 1px solid rgba(217, 226, 232, .72);
  background: rgba(238, 243, 246, .62);
}

#gallery {
  background: var(--surface);
}

.section-intro { margin-bottom: 1.8rem; }

.section-intro .title {
  font-family: "Google Sans", sans-serif;
  font-size: 1.75rem;
  line-height: 1.2;
}

.section-lead {
  margin: .65rem auto 0;
  max-width: 860px;
  color: var(--muted);
  font-size: 1.02rem;
  line-height: 1.68;
}

.teaser-panel { padding: 1rem; }

.teaser-video {
  width: min(100%, 920px);
  margin: 0 auto;
  border-radius: 14px;
  background: #0E1713;
}

.media-caption {
  margin: .85rem .2rem .05rem;
  color: var(--muted);
  font-size: .9rem;
  text-align: center;
}

.abstract-copy {
  max-width: 860px;
  margin: 0 auto;
  text-align: justify;
  text-justify: inter-word;
  hyphens: auto;
}

.abstract-copy strong { color: var(--brand-dark); }

.media-card {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(248, 250, 252, .95);
}

.method-figure {
  margin: 0;
  padding: 1.35rem;
}

.method-media {
  padding: .8rem;
}

.method-media img {
  width: 100%;
  border-radius: 16px;
}

.method-caption {
  margin: .85rem .2rem .05rem;
  color: var(--muted);
  font-size: .9rem;
  text-align: center;
}

.relighting-card { padding: 1rem; }

.relighting-grid-stage {
  position: relative;
  overflow: hidden;
  border-radius: 18px;
  background: #FFFFFF;
}

.relighting-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: .55rem;
  padding: .55rem;
}

.relighting-tile {
  position: relative;
  overflow: hidden;
  aspect-ratio: 724 / 484;
  border-radius: 12px;
  background: #0E1713;
}

.relighting-tile video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.relighting-tile-overlay {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(5, 12, 9, .12) 0%, rgba(5, 12, 9, .04) 48%, rgba(5, 12, 9, .72) 100%);
}

.relighting-tile-label {
  position: absolute;
  left: .55rem;
  bottom: .5rem;
  color: #F7FCF8;
  font-family: "Google Sans", sans-serif;
  font-size: clamp(.62rem, 1.1vw, .82rem);
  font-weight: 700;
  line-height: 1.1;
  text-shadow: 0 1px 4px rgba(0, 0, 0, .45);
}

.relighting-tile-chromeball {
  position: absolute;
  top: .45rem;
  right: .45rem;
  width: clamp(34px, 4.6vw, 62px);
  height: clamp(34px, 4.6vw, 62px);
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  object-fit: contain;
}

.icon-button {
  display: grid;
  place-items: center;
  width: 35px;
  height: 35px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--surface);
  color: var(--brand-dark);
  cursor: pointer;
  transition: background .2s ease, color .2s ease, transform .2s ease;
}

.icon-button:hover,
.icon-button:focus-visible {
  transform: translateY(-1px);
  background: var(--brand);
  color: #F8FCF9;
}

.carousel-shell {
  position: relative;
  padding: 0 64px 2.8rem;
}

.carousel-arrow {
  position: absolute;
  top: calc(50% - 1.4rem);
  z-index: 2;
  width: 58px;
  height: 58px;
  border: 0;
  background: var(--brand-soft);
  color: var(--brand-dark);
  box-shadow: 0 8px 20px rgba(20, 33, 43, .18);
  font-size: 0;
  transform: translateY(-50%);
}

.carousel-arrow::before {
  display: block;
  width: 0;
  height: 0;
  border-top: 10px solid transparent;
  border-bottom: 10px solid transparent;
  content: "";
}

.carousel-arrow-prev::before {
  border-right: 14px solid currentColor;
  transform: translateX(-2px);
}

.carousel-arrow-next::before {
  border-left: 14px solid currentColor;
  transform: translateX(2px);
}

.carousel-arrow:hover,
.carousel-arrow:focus-visible {
  background: var(--brand);
  color: #F8FCF9;
  transform: translateY(-50%) scale(1.04);
}

.carousel-arrow-prev { left: 2px; }
.carousel-arrow-next { right: 2px; }

@keyframes carousel-slide-next {
  from { opacity: 0; transform: translateX(48px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes carousel-slide-prev {
  from { opacity: 0; transform: translateX(-48px); }
  to { opacity: 1; transform: translateX(0); }
}

.relighting-grid.is-slide-next,
.gallery-stage.is-slide-next {
  animation: carousel-slide-next .38s cubic-bezier(.22, .61, .36, 1);
}

.relighting-grid.is-slide-prev,
.gallery-stage.is-slide-prev {
  animation: carousel-slide-prev .38s cubic-bezier(.22, .61, .36, 1);
}

.speed-button {
  min-height: 44px;
  padding: .6rem 1rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--brand-soft);
  color: var(--brand-dark);
  cursor: pointer;
  font-family: "Google Sans", sans-serif;
  font-size: .9rem;
  font-weight: 700;
  letter-spacing: .01em;
  white-space: nowrap;
  transition: background .2s ease, color .2s ease, transform .2s ease;
}

.speed-button:hover,
.speed-button:focus-visible {
  transform: translateY(-1px);
  background: var(--brand);
  color: #F8FCF9;
}

.relighting-dots {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  padding: 1rem .25rem 0;
}

.relighting-dot {
  width: 8px;
  height: 8px;
  padding: 0;
  border: 1px solid var(--accent);
  border-radius: 50%;
  background: transparent;
  cursor: pointer;
}

.relighting-dot[aria-selected="true"] {
  border-color: var(--brand);
  background: var(--brand);
}

.dataset-tabs {
  margin-top: 1rem;
  margin-bottom: 1.8rem;
}

.dataset-tabs button[aria-selected="true"] {
  border-color: var(--brand-dark);
  background: var(--brand-dark);
  color: #F8FCF9;
}

.gallery-carousel-card {
  max-width: 980px;
  margin: 0 auto;
  overflow: hidden;
  padding: 1rem;
}

.gallery-stage {
  overflow: hidden;
  border-radius: 18px;
  background: #FFFFFF;
}

.gallery-slide-video {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: contain;
  background: #FFFFFF;
}

.gallery-carousel-toolbar {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem .25rem .1rem;
}

.gallery-dots {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-top: 1rem;
}

.gallery-dot {
  width: 8px;
  height: 8px;
  padding: 0;
  border: 1px solid var(--accent);
  border-radius: 50%;
  background: transparent;
  cursor: pointer;
}

.gallery-dot[aria-selected="true"] {
  border-color: var(--brand);
  background: var(--brand);
}

.footer {
  padding-top: 2rem;
  padding-bottom: 3rem;
  color: var(--muted);
  font-size: .82rem;
}

.footer a { color: var(--brand); }

:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 3px;
}

@media screen and (max-width: 1023px) {
  .gallery-carousel-card { max-width: 100%; }
}

@media screen and (max-width: 768px) {
  .container { width: min(100% - 24px, 680px); }

  .hero-body { padding-top: 3rem; }

  .section {
    padding-top: 3rem;
    padding-bottom: 3rem;
  }

  .landing-copy,
  .paper-card { border-radius: 18px; }

  .landing-copy { padding: 1.4rem; }
  .landing-copy-wide { padding: 1.5rem; }
  .method-figure { padding: 1rem; }

  .hero-tags,
  .hero-actions { justify-content: flex-start; }

  .tldr-text { font-size: .96rem; }

  .relighting-grid { gap: .35rem; padding: .35rem; }
  .relighting-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .relighting-tile { border-radius: 8px; }
  .gallery-carousel-card { padding: .75rem; }

  .carousel-shell {
    padding-right: 48px;
    padding-left: 48px;
  }

  .carousel-arrow {
    width: 44px;
    height: 44px;
  }

  .carousel-arrow::before {
    border-top-width: 8px;
    border-bottom-width: 8px;
  }

  .carousel-arrow-prev { left: 2px; }
  .carousel-arrow-next { right: 2px; }
}

@media (prefers-reduced-motion: reduce) {
  .relighting-grid.is-slide-next,
  .relighting-grid.is-slide-prev,
  .gallery-stage.is-slide-next,
  .gallery-stage.is-slide-prev {
    animation: none;
  }
}