:root {
  --bg0: #0c1016;
  --bg1: #0f1722;
  --card: rgba(255, 255, 255, 0.06);
  --card2: rgba(255, 255, 255, 0.085);
  --text: rgba(255, 255, 255, 0.92);
  --muted: rgba(255, 255, 255, 0.70);
  --faint: rgba(255, 255, 255, 0.55);
  --border: rgba(255, 255, 255, 0.12);
  --shadow: 0 18px 60px rgba(0, 0, 0, 0.45);

  --accent: #f2b86b;
  --accent2: #64d1c1;
  --danger: #ff6a6a;

  --radius: 18px;
  --radius2: 26px;

  --sans: "Spline Sans", ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto,
    Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  --serif: "Fraunces", ui-serif, Georgia, "Times New Roman", Times, serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  background: radial-gradient(1200px 900px at 15% 5%, rgba(242, 184, 107, 0.16), transparent 55%),
    radial-gradient(900px 700px at 80% 15%, rgba(100, 209, 193, 0.14), transparent 50%),
    linear-gradient(180deg, var(--bg0), var(--bg1));
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.4;
}

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

.container {
  width: min(1280px, calc(100% - 36px));
  margin: 0 auto;
}

.bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  overflow: hidden;
}

.bg__grid {
  position: absolute;
  inset: -30%;
  background:
    linear-gradient(to right, rgba(255, 255, 255, 0.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 64px 64px;
  transform: rotate(-8deg);
  opacity: 0.35;
  filter: blur(0.2px);
}

.bg__blob {
  position: absolute;
  width: 760px;
  height: 760px;
  border-radius: 999px;
  filter: blur(40px);
  opacity: 0.35;
}

.bg__blob--a {
  left: -220px;
  top: 140px;
  background: radial-gradient(circle at 30% 30%, rgba(242, 184, 107, 0.75), transparent 55%);
}

.bg__blob--b {
  right: -260px;
  top: -140px;
  background: radial-gradient(circle at 30% 30%, rgba(100, 209, 193, 0.75), transparent 55%);
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 5;
  backdrop-filter: blur(14px);
  background: linear-gradient(180deg, rgba(12, 16, 22, 0.85), rgba(12, 16, 22, 0.55));
  border-bottom: 1px solid rgba(255, 255, 255, 0.10);
}

.topbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
  gap: 14px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 650;
  letter-spacing: 0.2px;
}

.brand__mark {
  width: 16px;
  height: 16px;
  border-radius: 6px;
  background: conic-gradient(from 220deg, var(--accent), var(--accent2), var(--accent));
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.32);
}

.brand__text {
  font-family: var(--serif);
  font-variation-settings: "opsz" 92;
}

.nav {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.nav__link {
  font-size: 14px;
  color: var(--muted);
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid transparent;
  transition: background 180ms ease, border-color 180ms ease, color 180ms ease;
}

.nav__link:hover {
  color: var(--text);
  border-color: rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.06);
}

.hero {
  padding: 44px 0 22px;
  position: relative;
}

.hero__inner {
  position: relative;
  padding: 54px 0 54px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.hero--video {
  padding: 0;
  min-height: min(78vh, 720px);
  display: grid;
  align-items: end;
  border-bottom: 1px solid rgba(255, 255, 255, 0.10);
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.02);
  filter: saturate(1.08) contrast(1.06);
}

.hero--image {
  padding: 0;
  min-height: min(78vh, 720px);
  display: grid;
  align-items: end;
  border-bottom: 1px solid rgba(255, 255, 255, 0.10);
  overflow: hidden;
}

.hero__bgimg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
  background: #0c1016;
  filter: saturate(1.05) contrast(1.02);
}

.hero__scrim {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(900px 520px at 22% 40%, rgba(12, 16, 22, 0.20), rgba(12, 16, 22, 0.88)),
    linear-gradient(180deg, rgba(12, 16, 22, 0.45), rgba(12, 16, 22, 0.92));
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.04);
  padding: 7px 12px;
  border-radius: 999px;
  color: var(--muted);
  font-size: 13px;
  margin: 0 0 12px;
}

.title {
  font-family: var(--serif);
  font-weight: 780;
  letter-spacing: -0.2px;
  line-height: 1.05;
  margin: 0;
  font-size: clamp(34px, 4vw, 54px);
}

.title__sub {
  display: block;
  font-weight: 560;
  font-variation-settings: "opsz" 66;
  color: rgba(255, 255, 255, 0.78);
  margin-top: 10px;
  font-size: clamp(16px, 1.4vw, 20px);
  letter-spacing: 0.1px;
}

.subtitle {
  margin: 16px 0 0;
  max-width: 62ch;
  color: var(--muted);
  font-size: 16px;
}

.authors,
.affils {
  margin-top: 14px;
  color: rgba(255, 255, 255, 0.86);
  font-size: 14px;
}

.authors__dot,
.affils__dot {
  color: rgba(255, 255, 255, 0.42);
  padding: 0 6px;
}

.cta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  font-size: 14px;
  transition: transform 120ms ease, background 150ms ease, border-color 150ms ease;
}

.btn:hover {
  transform: translateY(-1px);
  border-color: rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.07);
}

.btn--primary {
  border-color: rgba(242, 184, 107, 0.30);
  background: linear-gradient(180deg, rgba(242, 184, 107, 0.22), rgba(242, 184, 107, 0.09));
}

.note {
  margin: 14px 0 0;
  color: var(--faint);
  font-size: 13px;
}

.card {
  border-radius: var(--radius2);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.03));
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.card--media {
  position: relative;
}

.media {
  aspect-ratio: 16 / 10;
  background: rgba(0, 0, 0, 0.2);
  display: flex;
  align-items: center;
  justify-content: center;
}

.media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.92;
}

.card__caption {
  padding: 12px 14px 14px;
  border-top: 1px solid rgba(255, 255, 255, 0.10);
  background: rgba(0, 0, 0, 0.12);
}

.caption__kicker {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.62);
}

.caption__text {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.78);
}

.media--video video {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  background: #090c10;
}

.card--wide {
  width: 100%;
}

.featured {
  padding: 30px 0 10px;
}

.featured__banner {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
}

.vbox--featured video {
  aspect-ratio: 16 / 10;
  height: auto;
}

.pill--featured {
  border-color: rgba(100, 209, 193, 0.26);
  background: linear-gradient(180deg, rgba(100, 209, 193, 0.18), rgba(100, 209, 193, 0.05));
  color: rgba(255, 255, 255, 0.82);
}

.section {
  padding: 42px 0;
}

.section__head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin-bottom: 16px;
}

.section__head--split {
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: 14px;
}

.h2 {
  font-family: var(--serif);
  font-weight: 760;
  margin: 0;
  font-size: 30px;
  letter-spacing: -0.2px;
}

.section__lead {
  margin: 0;
  color: var(--muted);
  max-width: 74ch;
}

.parts {
  display: grid;
  gap: 18px;
  margin-top: 14px;
}

.section__part {
  display: grid;
  gap: 10px;
}

.part__head {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 2px 2px 0;
}

.part__title {
  font-family: var(--serif);
  font-weight: 740;
  font-size: 20px;
  letter-spacing: -0.1px;
  margin: 0;
  color: rgba(255, 255, 255, 0.92);
}

.part__lead {
  margin: 0;
  color: rgba(255, 255, 255, 0.70);
  max-width: 74ch;
  font-size: 14px;
  line-height: 1.55;
}

.prose {
  padding: 18px 18px;
  border-radius: var(--radius2);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.10);
}

.prose p {
  margin: 0;
  color: rgba(255, 255, 255, 0.86);
}

.prose--wide {
  /* When a prose card is placed inside a `.gallery` grid, make it span the full row. */
  grid-column: 1 / -1;
}

.prose--abstract {
  font-size: 17px;
  line-height: 1.7;
}

.prose__h3 {
  /* "h3-sized" paragraph style used by the Abstract and the short summary block. */
  margin: 0;
  font-size: 20px;
  line-height: 1.65;
  font-weight: 540;
  color: rgba(255, 255, 255, 0.90);
}

.prose__h3 + .prose__h3,
.prose__h3 + p,
p + .prose__h3 {
  margin-top: 10px;
}

.method__todo {
  margin-top: 14px;
  font-size: 16px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.82);
}

.method__todo strong {
  color: rgba(255, 255, 255, 0.92);
  font-weight: 680;
}

.steps--wide {
  margin-top: 14px;
  grid-template-columns: repeat(3, 1fr);
}

.card--figure {
  overflow: hidden;
}

.figure {
  width: 100%;
  height: auto;
  display: block;
  background: rgba(0, 0, 0, 0.18);
}

.steps {
  display: grid;
  gap: 12px;
}

.step {
  border-radius: var(--radius);
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.04);
  padding: 14px 14px;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
}

.step__num {
  font-family: var(--serif);
  font-weight: 820;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.55);
}

.step__title {
  font-weight: 650;
  letter-spacing: 0.2px;
}

.step__text {
  margin-top: 8px;
  color: rgba(255, 255, 255, 0.76);
  font-size: 14px;
}

.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding: 12px 12px;
  border-radius: var(--radius2);
  border: 1px solid rgba(255, 255, 255, 0.10);
  background: rgba(255, 255, 255, 0.03);
  margin-top: 6px;
}

.toolbar__group {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.toolbar__group--right {
  justify-content: flex-end;
}

.chip {
  appearance: none;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.03);
  color: rgba(255, 255, 255, 0.82);
  font-size: 13px;
  padding: 8px 12px;
  border-radius: 999px;
  cursor: pointer;
  transition: background 140ms ease, border-color 140ms ease, transform 120ms ease;
}

.chip:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.20);
  transform: translateY(-1px);
}

.chip.is-active {
  border-color: rgba(242, 184, 107, 0.30);
  background: linear-gradient(180deg, rgba(242, 184, 107, 0.18), rgba(242, 184, 107, 0.06));
}

.toggle {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: rgba(255, 255, 255, 0.80);
  font-size: 13px;
  user-select: none;
}

.toggle input {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
}

.gallery {
  margin-top: 14px;
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 14px;
}

.carousel {
  position: relative;
  margin-top: 14px;
}

.gallery--carousel {
  /* Nerfies-like horizontal carousel scroller; each slide is `.carousel__page`. */
  display: flex;
  gap: 14px;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  scroll-behavior: smooth;
  padding: 12px;
  border-radius: var(--radius2);
  border: 1px solid rgba(255, 255, 255, 0.10);
  background: rgba(0, 0, 0, 0.12);
}

.gallery--carousel::-webkit-scrollbar {
  display: none;
}

.carousel__page {
  flex: 0 0 100%;
  scroll-snap-align: start;
}

/* Compared with SOTA: one page shows two cards stacked (two rows). */
.carousel--compare .carousel__page {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.carousel--compare .carousel__page .vcard {
  grid-column: 1 / -1;
}

/* Ablation parts: one page shows two cards in one row (two columns). */
.carousel--row2 .carousel__page {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 14px;
}

.carousel--row2 .carousel__page .vcard {
  grid-column: span 6;
}

.section__left {
  display: grid;
  gap: 10px;
}

/* Carousel chrome (Compared with SOTA). */
.carousel__btn {
  appearance: none;
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 3;
  width: 44px;
  height: 44px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(10px);
  color: rgba(255, 255, 255, 0.92);
  font-size: 26px;
  line-height: 1;
  cursor: pointer;
  display: grid;
  place-items: center;
  box-shadow: 0 18px 60px rgba(0, 0, 0, 0.40);
  transition: transform 120ms ease, background 150ms ease, border-color 150ms ease;
}

.carousel__btn:hover {
  background: rgba(255, 255, 255, 0.10);
  border-color: rgba(255, 255, 255, 0.28);
  transform: translateY(-50%) scale(1.03);
}

.carousel__btn:active {
  transform: translateY(-50%) scale(0.99);
}

.carousel__btn:focus-visible {
  outline: 2px solid rgba(242, 184, 107, 0.65);
  outline-offset: 3px;
}

.carousel__btn--prev {
  left: 12px;
}

.carousel__btn--next {
  right: 12px;
}

.carousel__dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  padding-top: 10px;
}

.dotbtn {
  appearance: none;
  width: 10px;
  height: 10px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(255, 255, 255, 0.20);
  cursor: pointer;
  transition: transform 120ms ease, background 150ms ease, border-color 150ms ease;
}

.dotbtn:hover {
  background: rgba(255, 255, 255, 0.28);
  border-color: rgba(255, 255, 255, 0.28);
  transform: scale(1.08);
}

.dotbtn.is-active {
  background: linear-gradient(180deg, rgba(242, 184, 107, 0.85), rgba(100, 209, 193, 0.55));
  border-color: rgba(242, 184, 107, 0.45);
  transform: scale(1.10);
}

.gallery[data-section="more_results"] .vcard {
  grid-column: span 5;
}

.gallery[data-section="more_results"] {
  /* Reduce the "empty block" look when neighboring videos have very different heights. */
  align-items: start;
}

.gallery[data-section="more_results"] .vcard:nth-child(6n + 1) {
  grid-column: span 7;
}

.gallery[data-section="more_results"] .vcard:nth-child(6n + 2) {
  grid-column: span 5;
}

.gallery[data-section="more_results"] .vcard:nth-child(6n + 3) {
  grid-column: span 4;
}

.gallery[data-section="more_results"] .vcard:nth-child(6n + 4) {
  grid-column: span 8;
}

.gallery[data-section="more_results"] .vcard:nth-child(6n + 5) {
  grid-column: span 6;
}

.gallery[data-section="more_results"] .vcard:nth-child(6n + 6) {
  grid-column: span 6;
}

.gallery[data-section="highlights"] .vcard {
  grid-column: span 6;
}

.gallery[data-section="highlights"] .vcard:nth-child(6n + 1) {
  grid-column: 1 / -1;
}

.gallery[data-section="highlights"] .vcard:nth-child(6n + 2) {
  grid-column: span 6;
}

.gallery[data-section="highlights"] .vcard:nth-child(6n + 3) {
  grid-column: span 6;
}

/* Only 3 items expected; first is full-width, next 2 share a row. */

.gallery[data-section="ref_audio"] .vcard {
  grid-column: span 5;
}

.gallery[data-section="ref_audio"] {
  /* Reduce the "empty block" look when neighboring videos have very different heights. */
  align-items: start;
}

.gallery[data-section="ref_audio"] .vcard:nth-child(6n + 1) {
  grid-column: span 7;
}

.gallery[data-section="ref_audio"] .vcard:nth-child(6n + 2) {
  grid-column: span 5;
}

.gallery[data-section="ref_audio"] .vcard:nth-child(6n + 3) {
  grid-column: span 4;
}

.gallery[data-section="ref_audio"] .vcard:nth-child(6n + 4) {
  grid-column: span 8;
}

.gallery[data-section="ref_audio"] .vcard:nth-child(6n + 5) {
  grid-column: span 6;
}

.gallery[data-section="ref_audio"] .vcard:nth-child(6n + 6) {
  grid-column: span 6;
}

.sections {
  display: grid;
  gap: 18px;
  margin-top: 14px;
}

.vsection {
  border-radius: var(--radius2);
  border: 1px solid rgba(255, 255, 255, 0.10);
  background: rgba(255, 255, 255, 0.02);
  padding: 14px;
}

/* vsection headers reuse `.section__head` / `.h2` / `.section__lead` for consistency. */

.skeleton {
  grid-column: 1 / -1;
  padding: 18px;
  border-radius: var(--radius2);
  border: 1px dashed rgba(255, 255, 255, 0.18);
  color: rgba(255, 255, 255, 0.66);
}

.vcard {
  grid-column: span 6;
  border-radius: var(--radius2);
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.03);
  overflow: hidden;
}

/* Per-video text blocks are intentionally not used; keep styles in case you re-enable them later. */
.vcard__head {
  display: none;
}

.vcard__title,
.vcard__meta {
  display: none;
}

.vpair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  padding: 12px;
  /* Prevent shorter videos from being stretched to match taller neighbors. */
  align-items: start;
}

.vpair--single {
  grid-template-columns: 1fr;
}

.vbox {
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  overflow: hidden;
  background: rgba(0, 0, 0, 0.18);
  align-self: start;
}

.vbox__label {
  display: none;
}

.vbox video {
  display: block;
  width: 100%;
  height: auto;
  background: #090c10;
}

.vcard__foot {
  display: none;
}

.kbd {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono",
    "Courier New", monospace;
  font-size: 12px;
  padding: 2px 7px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.16);
  background: rgba(255, 255, 255, 0.05);
  color: rgba(255, 255, 255, 0.82);
}

.bib {
  border-radius: var(--radius2);
  border: 1px solid rgba(255, 255, 255, 0.10);
  background: rgba(255, 255, 255, 0.03);
  overflow: hidden;
}

.bib__summary {
  cursor: pointer;
  padding: 12px 14px;
  color: rgba(255, 255, 255, 0.84);
  list-style: none;
}

.bib__summary::-webkit-details-marker {
  display: none;
}

.bib__code {
  margin: 0;
  padding: 14px;
  border-top: 1px solid rgba(255, 255, 255, 0.10);
  overflow: auto;
  background: rgba(0, 0, 0, 0.18);
  color: rgba(255, 255, 255, 0.84);
}

.footer {
  padding: 26px 0 38px;
  border-top: 1px solid rgba(255, 255, 255, 0.10);
  background: rgba(0, 0, 0, 0.10);
}

.footer__inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 16px;
  align-items: start;
}

.footer__meta {
  margin: 10px 0 0;
  color: rgba(255, 255, 255, 0.64);
  font-size: 13px;
  max-width: 70ch;
}

.footer__right {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.footer__link {
  color: rgba(255, 255, 255, 0.78);
  font-size: 13px;
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.10);
  background: rgba(255, 255, 255, 0.03);
}

.footer__link:hover {
  border-color: rgba(255, 255, 255, 0.18);
  background: rgba(255, 255, 255, 0.05);
}

.footer__sep {
  color: rgba(255, 255, 255, 0.38);
}

@media (max-width: 960px) {
  .hero--video {
    min-height: min(70vh, 640px);
  }
  .hero--image {
    min-height: min(70vh, 640px);
  }
  .vcard {
    grid-column: span 12;
  }
  .steps--wide {
    grid-template-columns: 1fr;
  }
  /* On touch devices, swiping is usually better than overlay arrows. */
  .carousel__btn {
    display: none;
  }
}

@media (max-width: 620px) {
  .nav {
    display: none;
  }
  .vpair {
    grid-template-columns: 1fr;
  }
  .gallery--carousel {
    padding: 10px;
  }
  .carousel--row2 .carousel__page {
    grid-template-columns: 1fr;
  }
  .carousel--row2 .carousel__page .vcard {
    grid-column: 1 / -1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .btn,
  .chip,
  .nav__link {
    transition: none !important;
  }
}