/* ===================== SVHighlights project page ===================== */
:root {
  --accent: #1f6feb;
  --accent-dark: #1a4fb4;
  --ink: #1f2328;
  --muted: #5b6470;
  --alt-bg: #f5f7fa;
  --border: #e3e6ea;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  color: var(--ink);
  background: #ffffff;
}

a { color: var(--accent); }
a:hover { color: var(--accent-dark); }

/* ---------- hero ---------- */
.hero.head {
  background: linear-gradient(180deg, #eef3fb 0%, #ffffff 100%);
  border-bottom: 1px solid var(--border);
  padding-top: 1.5rem;
}

.paper-title {
  font-family: 'Roboto', -apple-system, BlinkMacSystemFont, sans-serif;
  font-weight: 700;
  font-size: 2.65rem;
  line-height: 1.18;
  letter-spacing: -0.022em;
  margin-bottom: 1.4rem;
  color: #16223a;
}

.venue { margin-bottom: 1.4rem; }
.venue-tag {
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  letter-spacing: 0.02em;
}
.venue-sub {
  margin-left: 0.6rem;
  color: var(--muted);
  font-weight: 500;
  font-size: 1rem;
}

.authors { font-size: 1.22rem; margin-bottom: 0.4rem; }
.authors .author { margin: 0 0.55rem; white-space: nowrap; }
.authors .author a { color: var(--ink); text-decoration: none; border-bottom: none; }
.authors .author a:hover { color: var(--accent); text-decoration: none; }
.authors sup { color: var(--accent); font-weight: 700; }

.affiliation { font-size: 1.05rem; color: var(--muted); margin-bottom: 0.2rem; }
.contrib { font-size: 0.9rem; color: var(--muted); margin-bottom: 1.5rem; }
.contrib sup { color: var(--accent); }

/* ---------- link buttons ---------- */
.link-buttons { display: flex; justify-content: center; flex-wrap: wrap; gap: 0.75rem; }
.link-buttons .button {
  background: #1f2328;
  border: none;
  font-weight: 500;
  padding-left: 1.3rem;
  padding-right: 1.3rem;
}
.link-buttons .button:hover { background: #000; }
.link-buttons .button[disabled] { background: #b8bdc4; opacity: 1; cursor: not-allowed; }
.link-buttons .button em { font-style: normal; opacity: 0.75; font-weight: 400; margin-left: 0.25rem; }

/* ---------- sections ---------- */
.section-title {
  font-family: 'Roboto', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 1.9rem;
  font-weight: 700;
  letter-spacing: -0.018em;
  color: #16223a;
  margin-bottom: 1.6rem;
}
.section-alt { background: var(--alt-bg); }

.abstract { font-size: 1.05rem; line-height: 1.75; color: #2c333d; }
.abstract ol { margin-top: 0.6rem; }
.abstract li { margin-bottom: 0.5rem; }

img { border-radius: 6px; }

.caption {
  font-size: 0.92rem;
  color: var(--muted);
  margin-top: 0.7rem;
  font-style: italic;
}

.teaser-section img { max-width: 680px; width: 100%; box-shadow: 0 4px 18px rgba(20,40,80,0.10); }

/* ---------- stats ---------- */
.stats-section { padding-top: 1.5rem; padding-bottom: 1.5rem; }
.stat-num {
  font-family: 'Roboto', -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 2.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--accent);
  line-height: 1;
}
.stat-num .stat-unit { font-size: 1.4rem; margin-left: 1px; }
.stat-label {
  font-size: 0.9rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-top: 0.4rem;
}

/* ---------- video grid ---------- */
.video-grid { margin-top: 0.5rem; }
.video-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 3px 12px rgba(20,40,80,0.07);
  height: 100%;
}
.video-label {
  font-weight: 700;
  font-size: 1rem;
  padding: 0.65rem 0.9rem;
  background: #16223a;
  color: #fff;
  margin: 0;
}
.video-card video { display: block; width: 100%; background: #000; }

/* ---------- footer ---------- */
.footer { background: #16223a; color: #cbd3df; }
.footer a { color: #9ec1ff; }
.footer-note { font-size: 0.85rem; color: #8c97a8; margin-top: 0.6rem; }

/* ---------- responsive ---------- */
@media screen and (max-width: 768px) {
  .paper-title { font-size: 1.85rem; }
  .section-title { font-size: 1.55rem; }
  .authors { font-size: 1.05rem; }
  .authors .author { display: inline-block; margin: 0.15rem 0.45rem; }
  .stat-num { font-size: 2rem; }
}