:root {
  --bg: #ffffff;
  --bg-soft: #f5f6f8;
  --panel: #ffffff;
  --border: #e2e5ea;
  --text: #2a2e35;
  --text-dim: #5c636e;
  --text-faint: #9199a5;
  --accent: #2f6bd6;
  --accent-soft: #eaf1fc;
  --ours: #1f7a45;
  --ours-bg: rgba(31, 122, 69, 0.08);
  --max-width: 860px;
  --serif: "Newsreader", Georgia, "Times New Roman", serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px 96px;
}

/* ---------- Hero ---------- */
.hero {
  text-align: center;
  padding: 72px 0 24px;
}

.title {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 2.35rem;
  line-height: 1.22;
  letter-spacing: -0.01em;
  margin: 0 0 28px;
  color: #14171c;
}

.title-sub {
  font-size: 1.7rem;
  color: var(--text);
  font-weight: 400;
}

.authors {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px 22px;
  font-size: 1.12rem;
  margin-bottom: 10px;
}

.author {
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.author:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.author sup {
  color: var(--accent);
  font-size: 0.7em;
}

.affiliations {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 4px 20px;
  color: var(--text-dim);
  font-size: 0.98rem;
}

.affiliations sup {
  color: var(--accent);
}

.venue {
  margin-top: 14px;
  display: inline-block;
  max-width: 100%;
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  line-height: 1.4;
  color: var(--accent);
  border: 1px solid var(--accent-soft);
  background: var(--accent-soft);
  padding: 6px 16px;
  border-radius: 999px;
}

.buttons {
  display: flex;
  flex-wrap: nowrap;
  justify-content: center;
  gap: 10px;
  margin-top: 28px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 15px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 500;
  white-space: nowrap;
  transition: border-color 0.18s ease, background 0.18s ease, transform 0.18s ease;
}

.btn:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
  transform: translateY(-1px);
}

.btn-icon {
  font-family: var(--mono);
  font-size: 0.95em;
  opacity: 0.9;
}

.btn-soon {
  color: var(--text-dim);
  cursor: not-allowed;
}

.btn-soon:hover {
  border-color: var(--border);
  background: var(--panel);
  transform: none;
}

.soon-badge {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 999px;
  padding: 1px 7px;
  margin-left: 2px;
}

/* ---------- Teaser ---------- */
.teaser {
  margin: 40px 0 8px;
}

.teaser img,
.teaser video {
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--bg-soft);
  display: block;
}

.teaser video {
  filter: brightness(1.15);
}

/* ---------- Sections ---------- */
.section {
  padding: 44px 0 8px;
  margin-top: 8px;
}

h2 {
  font-family: var(--serif);
  font-weight: 500;
  font-size: 1.9rem;
  letter-spacing: -0.01em;
  margin: 0 0 20px;
  color: #14171c;
}

h3 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.25rem;
  margin: 0 0 8px;
  color: #1c2028;
}

p {
  margin: 0 0 18px;
  color: var(--text);
}

.lead {
  font-size: 1.22rem;
  color: #14171c;
  font-family: var(--serif);
  line-height: 1.5;
}

strong {
  color: #14171c;
  font-weight: 600;
}

em {
  color: #14171c;
}

/* ---------- Lists ---------- */
.highlights,
.steps {
  padding-left: 0;
  list-style: none;
  margin: 0 0 8px;
}

.highlights li {
  position: relative;
  padding: 8px 0 8px 30px;
  border-bottom: 1px solid var(--bg-soft);
}

.highlights li::before {
  content: "\2192";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 600;
}

.steps {
  counter-reset: step;
}

.steps li {
  position: relative;
  padding: 4px 0 16px 44px;
  counter-increment: step;
}

.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 2px;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid var(--border);
  border-radius: 50%;
  font-family: var(--mono);
  font-size: 0.9rem;
}

/* ---------- Split (image + text) ---------- */
.split {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 32px;
  align-items: center;
}

.split-media img {
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--bg-soft);
  display: block;
}

.split-text h3 {
  margin-top: 0;
}

.split-text h3 + .bullets {
  margin-bottom: 22px;
}

.bullets {
  list-style: none;
  padding-left: 0;
  margin: 0;
}

.bullets li {
  position: relative;
  padding: 5px 0 5px 20px;
  color: var(--text);
}

.bullets li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 15px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
}

/* ---------- Bar chart (training data) ---------- */
.barchart {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin: 24px 0 12px;
}

.bar-row {
  display: grid;
  grid-template-columns: 150px 1fr 52px;
  align-items: center;
  gap: 14px;
}

.bar-label {
  font-size: 0.92rem;
  color: var(--text);
  text-align: right;
  white-space: nowrap;
}

.bar-track {
  height: 22px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
}

.bar-fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #6ea8ef);
  border-radius: 5px 0 0 5px;
}

.bar-value {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--text-dim);
  white-space: nowrap;
}

@media (max-width: 640px) {
  .bar-row {
    grid-template-columns: 110px 1fr 46px;
    gap: 10px;
  }
  .bar-label {
    font-size: 0.85rem;
  }
}

/* ---------- Give-back note ---------- */
.give-back {
  font-size: 0.92rem;
  color: var(--text-dim);
  line-height: 1.55;
}

/* ---------- Inline email link ---------- */
a[href^="mailto:"] {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.18s ease;
}

a[href^="mailto:"]:hover {
  border-bottom-color: var(--accent);
}

/* ---------- Contact line ---------- */
.contact {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-dim);
  font-size: 0.96rem;
  margin-top: 16px;
}

.contact a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.18s ease;
}

.contact a:hover {
  border-bottom-color: var(--accent);
}

.contact .btn-icon {
  color: var(--accent);
  font-size: 1.05rem;
}

/* ---------- Roadmap checklist ---------- */
.roadmap {
  list-style: none;
  padding-left: 0;
  margin: 0;
}

.roadmap li {
  position: relative;
  padding: 9px 0 9px 30px;
  border-bottom: 1px solid var(--bg-soft);
  color: var(--text);
  font-size: 0.92rem;
}

.roadmap li::before {
  position: absolute;
  left: 0;
  top: 10px;
  width: 16px;
  height: 16px;
  border-radius: 5px;
  border: 1.5px solid var(--border);
  text-align: center;
  line-height: 14px;
  font-size: 0.72rem;
}

.roadmap li.todo::before {
  content: "";
}

.roadmap li.done::before {
  content: "\2713";
  color: #fff;
  background: var(--ours);
  border-color: var(--ours);
}

.roadmap li.done {
  color: var(--text-dim);
}

/* ---------- Q&A ---------- */
.qa {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 22px 24px;
  margin-bottom: 18px;
}

.qa p:last-child {
  margin-bottom: 0;
}

/* ---------- Media ---------- */
.media {
  margin: 24px 0 8px;
}

.media video,
.media img {
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--border);
  display: block;
  background: var(--bg-soft);
}

.media-placeholder {
  width: 100%;
  aspect-ratio: 16 / 9;
  border: 1px dashed var(--border);
  border-radius: 12px;
  background:
    repeating-linear-gradient(
      45deg,
      var(--bg-soft),
      var(--bg-soft) 12px,
      #ecedf1 12px,
      #ecedf1 24px
    );
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-faint);
  font-family: var(--mono);
  font-size: 0.86rem;
  text-align: center;
  padding: 16px;
}

.media-placeholder::before {
  content: "\25B6  " attr(data-label);
  white-space: pre-wrap;
}

.media-grid {
  display: grid;
  gap: 16px;
  margin: 24px 0 8px;
}

.media-grid.two {
  grid-template-columns: 1fr 1fr;
}

.media-grid .media {
  margin: 0;
}

/* ---------- Carousel ---------- */
.carousel {
  position: relative;
  margin: 24px 0 8px;
}

.carousel-track {
  display: flex;
  gap: 16px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scroll-behavior: smooth;
  scrollbar-width: none;
  padding-bottom: 4px;
}

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

.carousel-item {
  flex: 0 0 calc((100% - 32px) / 3);
  scroll-snap-align: start;
}

.carousel-item video {
  width: 100%;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--bg-soft);
  display: block;
}

.carousel-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 2;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.12);
  transition: border-color 0.18s ease, background 0.18s ease, opacity 0.18s ease;
}

.carousel-btn:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.carousel-btn.prev {
  left: -14px;
}

.carousel-btn.next {
  right: -14px;
}

.carousel-btn:disabled {
  opacity: 0.35;
  cursor: default;
}

figcaption,
.caption {
  color: var(--text-dim);
  font-size: 0.92rem;
  line-height: 1.55;
  margin-top: 12px;
  text-align: center;
}

.teaser .caption {
  text-align: left;
}

/* ---------- Table ---------- */
.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 12px;
  margin-bottom: 12px;
}

table {
  border-collapse: collapse;
  width: 100%;
  font-size: 0.9rem;
  font-variant-numeric: tabular-nums;
}

th,
td {
  padding: 10px 14px;
  text-align: right;
  white-space: nowrap;
  border-bottom: 1px solid var(--border);
}

th:first-child,
td:first-child {
  text-align: left;
}

thead th {
  color: var(--text-dim);
  font-weight: 600;
  background: var(--bg-soft);
  font-family: var(--mono);
  font-size: 0.8rem;
}

tbody tr:last-child td {
  border-bottom: none;
}

tr.ours {
  background: var(--ours-bg);
}

tr.ours td {
  color: var(--ours);
  font-weight: 600;
}

tr.ours td:first-child {
  color: var(--ours);
}

/* ---------- BibTeX ---------- */
.bibtex {
  position: relative;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 4px 4px;
}

.bibtex pre {
  margin: 0;
  padding: 20px 22px;
  overflow-x: auto;
}

.bibtex code {
  font-family: var(--mono);
  font-size: 0.86rem;
  line-height: 1.6;
  color: var(--text-dim);
}

.copy-btn {
  position: absolute;
  top: 12px;
  right: 12px;
  padding: 6px 14px;
  font-size: 0.82rem;
  font-family: var(--sans);
  color: var(--text);
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  transition: border-color 0.18s ease, background 0.18s ease;
}

.copy-btn:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.copy-btn.copied {
  color: var(--ours);
  border-color: var(--ours);
}

/* ---------- Footer ---------- */
.ack {
  color: var(--text-dim);
  font-size: 0.96rem;
}

.footer {
  margin-top: 56px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-faint);
  font-size: 0.88rem;
}

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
  body {
    font-size: 16px;
  }
  .title {
    font-size: 1.8rem;
  }
  .title-sub {
    font-size: 1.35rem;
  }
  h2 {
    font-size: 1.55rem;
  }
  .media-grid.two {
    grid-template-columns: 1fr;
  }
  .split {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .carousel-item {
    flex: 0 0 calc((100% - 16px) / 2);
  }
  .carousel-btn.prev {
    left: -6px;
  }
  .carousel-btn.next {
    right: -6px;
  }
  .hero {
    padding-top: 48px;
  }
  .buttons {
    flex-wrap: wrap;
  }
}