:root {
  --ink: #1a1a1a;
  --ink-soft: #4a4a4a;
  --muted: #767676;
  --bg: #ffffff;
  --bg-alt: #f7f7f8;
  --accent: #c0392b;      /* rename to your project's accent color */
  --accent-soft: #f4e3e1;
  --border: #e5e5e7;
  --radius: 10px;
  --maxw: 1080px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Noto Sans", "Google Sans", -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}
.container.narrow { max-width: 760px; }

/* ---------- Top nav ---------- */
.topnav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.topnav-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.topnav-brand {
  font-family: "JetBrains Mono", monospace;
  font-weight: 600;
  font-size: 15px;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: -0.02em;
}
.topnav-links {
  list-style: none;
  display: flex;
  gap: 28px;
  margin: 0;
  padding: 0;
}
.topnav-links a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 14.5px;
  font-weight: 500;
  transition: color 0.15s ease;
}
.topnav-links a:hover { color: var(--accent); }
.topnav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 18px;
  cursor: pointer;
  color: var(--ink);
}

@media (max-width: 720px) {
  .topnav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    gap: 0;
    display: none;
    padding: 8px 24px 16px;
  }
  .topnav-links.open { display: flex; }
  .topnav-links li { padding: 10px 0; border-bottom: 1px solid var(--border); }
  .topnav-links li:last-child { border-bottom: none; }
  .topnav-toggle { display: block; }
}

/* ---------- Hero ---------- */
.hero {
  padding: 64px 24px 40px;
  text-align: center;
}
.hero-inner { max-width: 760px; margin: 0 auto; }
.hero-inner .hero-title {
  max-width: var(--maxw);
  margin-left: calc((760px - var(--maxw)) / 2);
  margin-right: calc((760px - var(--maxw)) / 2);
}
.hero-venue {
  font-family: "JetBrains Mono", monospace;
  font-size: 13px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin: 0 0 12px;
}
.hero-title {
  font-family: "Google Sans", sans-serif;
  font-size: clamp(2.4rem, 5vw, 3.4rem);
  font-weight: 700;
  margin: 0 0 6px;
  letter-spacing: -0.02em;
}
.hero-title-accent {
  display: block;
  font-size: 1em;
  font-weight: 700;
  line-height: 1.2;
}
.hero-title-sub {
  display: block;
  font-size: 0.5em;
  font-weight: 700;
  line-height: 1.2;
  margin-top: 5px;
}
.hero-subtitle {
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  color: var(--ink-soft);
  margin: 0 0 28px;
  font-weight: 400;
}
.hero-authors {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px 18px;
  font-size: 15.5px;
  margin-bottom: 6px;
}
.hero-authors a { color: var(--ink); text-decoration: none; border-bottom: 1px solid transparent; }
.hero-authors a:hover { border-bottom-color: var(--ink); }
.hero-affiliations {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 4px 16px;
  font-size: 13.5px;
  color: var(--muted);
}
.hero-note {
  font-size: 12.5px;
  color: var(--muted);
  margin: 4px 0 28px;
}
.hero-buttons {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: 999px;
  font-size: 14.5px;
  font-weight: 600;
  text-decoration: none;
  border: 1.5px solid var(--ink);
  transition: all 0.15s ease;
}
.btn-primary {
  color: var(--bg);
  background: var(--ink);
}
.btn-primary:hover {
  background: var(--accent);
  border-color: var(--accent);
}

/* Teaser strip */
.teaser-strip {
  max-width: var(--maxw);
  margin: 40px auto 0;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}
.teaser-strip video {
  width: 100%;
  border-radius: var(--radius);
  display: block;
  background: #000;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}
.teaser-caption {
  max-width: 640px;
  margin: 16px auto 0;
  padding: 0 24px;
  text-align: center;
  font-size: 13.5px;
  color: var(--muted);
}
@media (max-width: 720px) {
  .teaser-strip { grid-template-columns: 1fr; }
}

/* ---------- Sections ---------- */
.section { padding: 56px 0; }
.section-alt { background: var(--bg-alt); }
.section-title {
  font-family: "Google Sans", sans-serif;
  font-size: 1.6rem;
  font-weight: 700;
  margin: 0 0 8px;
  letter-spacing: -0.01em;
  text-align: center;
}
.section-subtitle {
  color: var(--muted);
  font-size: 15px;
  margin: 0 auto 28px;
  max-width: 720px;
}
.body-text {
  font-size: 15.5px;
  color: var(--ink-soft);
  max-width: 760px;
  margin: 0 auto;
}
.section-title::after {
  content: "";
  display: block;
  width: 36px;
  height: 3px;
  background: var(--accent);
  margin: 10px auto 0;
  border-radius: 2px;
}

.method-block { margin-top: 32px; }
.method-block:first-of-type { margin-top: 36px; }
.method-subtitle {
  font-size: 1.08rem;
  font-weight: 600;
  margin: 0 0 8px;
  color: var(--ink);
  text-align: center;
}

.figure { margin: 28px 0; }
.figure img {
  width: 100%;
  max-width: 760px;
  margin: 0 auto;
  border-radius: var(--radius);
  display: block;
}
.figure-caption {
  font-size: 13.5px;
  color: var(--muted);
  margin: 10px auto 0;
  max-width: 760px;
}

/* ---------- Video grids ---------- */
.video-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.video-grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) {
  .video-grid, .video-grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 560px) {
  .video-grid, .video-grid-4 { grid-template-columns: 1fr; }
}

.video-card {
  margin: 0;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.video-card video {
  width: 100%;
  display: block;
  aspect-ratio: 16 / 9;
  background: #000;
  object-fit: cover;
}
.video-card figcaption {
  padding: 8px 12px;
  font-size: 13px;
  color: var(--ink-soft);
  border-top: 1px solid var(--border);
}

/* ---------- Gallery rows ---------- */
.gallery-row { margin-bottom: 32px; }
.gallery-row:last-child { margin-bottom: 0; }
.gallery-row-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 12px;
  text-align: center;
}

/* ---------- Gallery controls ---------- */
.gallery-controls {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-bottom: 24px;
}
.gallery-ctrl-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 16px;
  border-radius: 999px;
  border: 1.5px solid var(--border);
  background: var(--bg);
  color: var(--ink-soft);
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
}
.gallery-ctrl-btn:hover {
  background: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
}
.gallery-ctrl-btn.active {
  background: var(--accent);
  color: var(--bg);
  border-color: var(--accent);
}

/* ---------- Gallery pager (swap full set of 3 on arrow click) ---------- */
.gallery-pager {
  display: flex;
  align-items: center;
  gap: 16px;
}
.gallery-pages {
  flex: 1;
  min-width: 0;
  overflow: hidden;
}
.gallery-track {
  display: flex;
  align-items: flex-start;
  transition: transform 0.45s ease;
}
.gallery-page {
  flex: 0 0 100%;
  min-width: 0;
}
.gallery-dots {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 16px;
}
.gallery-dot {
  width: 8px;
  height: 8px;
  padding: 0;
  border-radius: 50%;
  border: none;
  background: var(--border);
  cursor: pointer;
  transition: background 0.15s ease;
}
.gallery-dot.active { background: var(--accent); }
.carousel-btn {
  flex: 0 0 auto;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1.5px solid var(--border);
  background: var(--bg);
  color: var(--ink);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  transition: all 0.15s ease;
}
.carousel-btn:hover {
  background: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
}

/* ---------- Comparison rows ---------- */
.compare-row { margin-bottom: 44px; }
.compare-row:last-child { margin-bottom: 0; }
.compare-row-title {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 12px;
}
.compare-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
}
@media (max-width: 1000px) {
  .compare-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 620px) {
  .compare-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ---------- Ablation ---------- */
.ablation-block { margin-bottom: 40px; }
.ablation-block:last-child { margin-bottom: 0; }

/* ---------- BibTeX ---------- */
.bibtex-box {
  position: relative;
  background: #1e1e1e;
  border-radius: var(--radius);
  padding: 20px;
  overflow-x: auto;
}
.bibtex-box pre {
  margin: 0;
  font-family: "JetBrains Mono", monospace;
  font-size: 13px;
  color: #e8e8e8;
  white-space: pre;
}
.copy-btn {
  position: absolute;
  top: 12px;
  right: 12px;
  background: #333;
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 6px 12px;
  font-size: 12.5px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: background 0.15s ease;
}
.copy-btn:hover { background: var(--accent); }
.copy-btn.copied { background: #2e7d32; }

/* ---------- Footer ---------- */
.footer {
  padding: 28px 0 48px;
  text-align: center;
  font-size: 12.5px;
  color: var(--muted);
}
.footer a { color: var(--muted); }