:root {
  --bg: #fbf7ef;
  --bg-alt: #f2ecdf;
  --card: #fffdf7;
  --text: #1f2224;
  --muted: #56606a;
  --line: #d8cfbc;
  --primary: #006d77;
  --primary-2: #3a86ff;
  --accent: #f28f3b;
  --shadow: 0 12px 30px rgba(31, 34, 36, 0.08);
}

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

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 10% 10%, #fff8dc 0%, transparent 42%),
    radial-gradient(circle at 80% 20%, #e3f5f2 0%, transparent 45%),
    var(--bg);
  line-height: 1.62;
  text-align: center;
}

.bg-glow {
  position: fixed;
  border-radius: 999px;
  filter: blur(40px);
  opacity: 0.4;
  pointer-events: none;
  z-index: -1;
}

.bg-glow-a {
  width: 240px;
  height: 240px;
  background: #ffbe0b;
  top: -40px;
  right: 5%;
}

.bg-glow-b {
  width: 280px;
  height: 280px;
  background: #57cc99;
  bottom: -80px;
  left: -60px;
}

.container {
  width: min(1120px, 92%);
  margin: 0 auto;
}

main .container {
  width: min(940px, 92%);
}

.section {
  padding: 56px 0;
}

main > .section:first-child {
  padding-top: 18px;
}

.section.alt {
  background: linear-gradient(180deg, transparent 0%, rgba(255, 255, 255, 0.45) 100%);
}

h1,
h2,
h3 {
  font-family: "Space Grotesk", "Segoe UI", sans-serif;
  margin: 0 0 12px;
  line-height: 1.2;
}

h1 {
  font-size: clamp(1.4rem, 2.05vw, 2.15rem);
  max-width: 48ch;
  margin-inline: auto;
}

h2 {
  font-size: clamp(1.4rem, 2vw, 2rem);
}

h3 {
  font-size: 1.1rem;
}

p {
  margin: 0 0 10px;
}

.kicker {
  display: inline-block;
  font-size: 0.86rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--primary);
  background: rgba(0, 109, 119, 0.08);
  border: 1px solid rgba(0, 109, 119, 0.2);
  padding: 4px 10px;
  border-radius: 999px;
  margin-bottom: 14px;
}

.subtitle {
  font-size: 1.08rem;
  color: var(--muted);
  max-width: 70ch;
  margin-inline: auto;
}

.authors,
.affiliations,
.notes {
  margin-top: 16px;
}

.authors {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
  font-size: 1rem;
  justify-content: center;
  max-width: 920px;
  margin-inline: auto;
}

.author-link {
  color: #2f6fff;
  text-decoration: underline;
  text-underline-offset: 2px;
  text-decoration-thickness: 1px;
  border-bottom: 0;
  transition: color 0.2s ease;
}

.author-link:hover {
  color: #1e4fd6;
}

.affiliations,
.notes {
  color: var(--muted);
  font-size: 0.94rem;
}

.button-row {
  margin-top: 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}

.btn {
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--line);
  color: var(--text);
  background: #fff;
  padding: 8px 14px;
  border-radius: 10px;
  font-weight: 500;
  transition: transform 0.22s ease, box-shadow 0.22s ease, border-color 0.22s ease;
}

.btn svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
}

.btn:hover {
  transform: translateY(-2px);
  border-color: var(--primary-2);
  box-shadow: 0 8px 20px rgba(58, 134, 255, 0.2);
}

.btn-primary {
  background: linear-gradient(120deg, var(--primary), #008891);
  border-color: transparent;
  color: #fff;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 18px;
  box-shadow: var(--shadow);
}

.caption,
.muted {
  color: var(--muted);
  font-size: 0.92rem;
}

.abstract-text {
  max-width: 920px;
  margin-inline: auto;
  text-align: left;
}

.pipeline-description {
  max-width: 920px;
  margin: 14px auto 0;
  text-align: left;
  color: var(--text);
  font-size: 1rem;
  line-height: 1.62;
}

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

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

.grid.three {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.method-image {
  width: 100%;
  height: auto;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #fff;
  display: block;
}

.method-figure {
  width: 100%;
  min-height: 560px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #fff;
}

.demo-stack {
  display: grid;
  gap: 16px;
  margin-top: 12px;
}

.demo-row {
  text-align: left;
}

.demo-group-title {
  margin: 18px 0 8px;
  text-align: left;
}

.pair-prompt {
  margin-bottom: 12px;
}

.video-grid-2,
.video-grid-3,
.video-grid-4 {
  display: grid;
  gap: 10px;
}

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

.video-grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.video-grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.video-slot {
  display: flex;
  flex-direction: column;
  border-radius: 10px;
  padding: 0;
  gap: 8px;
}

.slot-title {
  order: 2;
  margin: 0;
  font-size: 0.9rem;
  font-weight: 600;
  color: #4d5661;
  background: transparent;
  border: 0;
  padding: 0 2px;
  text-align: center;
}

.demo-video {
  order: 1;
  width: 100%;
  border-radius: 10px;
  border: 1px solid #d3dae4;
  background: #111;
  margin: 0;
  display: block;
  box-shadow: 0 3px 10px rgba(20, 33, 61, 0.08);
}

.placeholder {
  order: 1;
  border: 1px dashed #d3dae4;
  background: repeating-linear-gradient(
    135deg,
    #ffffff,
    #ffffff 10px,
    #f7f9fc 10px,
    #f7f9fc 20px
  );
  border-radius: 10px;
  min-height: 130px;
  padding: 16px;
  display: grid;
  place-items: center;
  text-align: center;
  color: var(--muted);
  font-size: 0.92rem;
  margin: 0;
  box-shadow: 0 3px 10px rgba(20, 33, 61, 0.06);
}

.num-highlight {
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-decoration-color: #df8b00;
  background: rgba(255, 214, 128, 0.45);
  border-radius: 4px;
  padding: 0 0.16em;
}

.bibtex {
  margin: 0 auto;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: #1e2021;
  color: #efefef;
  padding: 14px;
  max-width: 920px;
  text-align: left;
}

.footer {
  border-top: 1px solid var(--line);
  padding-top: 26px;
}

/* Motion: subtle staged reveal */
[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 960px) {
  .grid.two,
  .grid.three {
    grid-template-columns: 1fr;
  }

  .video-grid-3,
  .video-grid-4 {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 700px) {
  .video-grid-2 {
    grid-template-columns: 1fr;
  }
}