:root {
  --text: #1f2328;
  --muted: #59636e;
  --faint: #8c959f;
  --rule: #e5e7eb;
  --bg: #ffffff;
  --panel: #f6f8fa;
  --accent: #1d4ed8;
  --wide: 1040px;
  --narrow: 820px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Noto Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  -webkit-text-size-adjust: 100%;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: var(--wide); margin: 0 auto; padding: 0 16px; }
.container.narrow { max-width: var(--narrow); }

/* ---------- header ---------- */
.hero { text-align: center; padding: 56px 0 28px; }

.title {
  margin: 0 auto;
  max-width: 900px;
  font-size: clamp(1.75rem, 1.1rem + 2.6vw, 2.75rem);
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
  text-wrap: balance;
}

.authors { margin: 18px 0 2px; font-size: 1.15rem; }
.venue { margin: 0; color: var(--muted); font-size: 0.98rem; text-wrap: balance; }

.links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-top: 22px;
}

.button {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 18px;
  border-radius: 999px;
  background: #363636;
  color: #fff;
  font-size: 0.92rem;
  line-height: 1.4;
}
.button:hover { background: #1f1f1f; text-decoration: none; }
.button svg { width: 14px; height: 14px; fill: currentColor; }

/* ---------- sections ---------- */
section { padding: 28px 0; }

.section-title {
  margin: 0 0 18px;
  text-align: center;
  font-size: 1.6rem;
  font-weight: 600;
}

.lead {
  margin: 0 auto 26px;
  max-width: var(--narrow);
  text-align: center;
  color: var(--muted);
  text-wrap: balance;
}
.lead strong { color: var(--text); font-weight: 600; }

/* real-time callout: same dark pill + red dot as the badge burned into the videos */
.realtime {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 8px 14px;
  margin: 0 auto 12px;
  text-align: center;
}

.rt-badge {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 16px 7px 14px;
  border-radius: 999px;
  background: #1f2328;
  color: #fff;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
}

.rt-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #ef4444;
  animation: rt-pulse 1.6s ease-out infinite;
}

@keyframes rt-pulse {
  0%   { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.6); }
  70%  { box-shadow: 0 0 0 7px rgba(239, 68, 68, 0); }
  100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0); }
}

@media (prefers-reduced-motion: reduce) {
  .rt-dot { animation: none; }
}

.rt-text { font-size: 1.08rem; text-wrap: balance; }
.rt-text strong { font-weight: 600; }
.nowrap, .rt-text strong { white-space: nowrap; }

/* ---------- demo videos ---------- */
.demo { margin: 0 0 40px; }
.demo:last-child { margin-bottom: 8px; }

/* demo groups (fine-tuned vs zero-shot) */
.group-head {
  margin: 6px auto 24px;
  max-width: var(--narrow);
  text-align: center;
}
.group-head.sep {
  margin-top: 56px;
  padding-top: 34px;
  border-top: 1px solid var(--rule);
}
.group-title { margin: 0 0 4px; font-size: 1.32rem; font-weight: 600; }
.group-note { margin: 0; color: var(--muted); font-size: 0.95rem; text-wrap: balance; }
.group-note strong { color: var(--text); font-weight: 600; }

.demo-title {
  margin: 0 0 10px;
  text-align: center;
  font-size: 1.12rem;
  font-weight: 600;
}

.video-frame {
  margin: 0 auto;
  border-radius: 10px;
  overflow: hidden;
  background: var(--panel);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.06), 0 4px 18px rgba(0, 0, 0, 0.06);
}

.video-frame video {
  display: block;
  width: 100%;
  height: auto;
}

/* side-by-side portrait clips share one width so their scale matches; wide clips use the full column */
.video-frame.portrait { max-width: 600px; }
.video-frame.wide     { max-width: var(--wide); }

.demo-caption {
  margin: 10px auto 0;
  max-width: var(--narrow);
  text-align: center;
  color: var(--muted);
  font-size: 0.92rem;
}
.demo-caption a { margin-left: 4px; white-space: nowrap; }
.demo-caption a::after { content: " \2197"; }

/* ---------- abstract ---------- */
.abstract p {
  margin: 0;
  text-align: justify;
  hyphens: auto;
}
.abstract a { overflow-wrap: anywhere; }

/* ---------- method figures ---------- */
.figure { margin: 0 0 36px; }
.figure:last-child { margin-bottom: 0; }

.figure-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }

.figure img {
  display: block;
  width: 100%;
  height: auto;
}

.figure figcaption {
  margin: 12px auto 0;
  max-width: var(--narrow);
  text-align: center;
  color: var(--muted);
  font-size: 0.95rem;
  text-wrap: balance;
}
.figure figcaption strong { color: var(--text); font-weight: 600; }

.scroll-hint { display: none; }

/* ---------- footer ---------- */
footer {
  margin-top: 36px;
  padding: 28px 0 40px;
  border-top: 1px solid var(--rule);
  text-align: center;
  color: var(--faint);
  font-size: 0.85rem;
}
footer a { color: inherit; text-decoration: underline; }

/* ---------- small screens ---------- */
@media (max-width: 640px) {
  body { font-size: 16px; }
  .hero { padding: 36px 0 18px; }
  .title br { display: none; }
  .hide-sm { display: none; }
  .authors { font-size: 1.05rem; }
  section { padding: 20px 0; }
  .section-title { font-size: 1.35rem; }
  .demo { margin-bottom: 30px; }
  .video-frame { border-radius: 8px; }
  .abstract p { text-align: left; hyphens: manual; }

  /* the method figures are very wide: let them scroll instead of shrinking to unreadable */
  .figure-scroll img { width: 760px; max-width: none; }
  .scroll-hint {
    display: block;
    margin-top: 6px;
    text-align: center;
    color: var(--faint);
    font-size: 0.8rem;
  }
}