:root {
  --bg: #f5f7fb;
  --paper: #ffffff;
  --ink: #111827;
  --muted: #667085;
  --line: #e6eaf2;
  --accent: #355cff;
  --accent-soft: #edf2ff;
  --dark: #0b1020;
  --dark-2: #121a32;
  --shadow: 0 18px 50px rgba(16, 24, 40, 0.12);
  --shadow-soft: 0 8px 28px rgba(16, 24, 40, 0.08);
  --radius: 22px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 0%, rgba(53, 92, 255, 0.16), transparent 31rem),
    radial-gradient(circle at 90% 0%, rgba(42, 181, 148, 0.13), transparent 27rem),
    linear-gradient(180deg, #fbfcff 0%, var(--bg) 34%, #f8fafc 100%);
  line-height: 1.55;
}

a { color: inherit; text-decoration: none; }
img, video { max-width: 100%; display: block; }

.container { width: min(1280px, calc(100% - 40px)); margin: 0 auto; }

.topnav {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(18px);
  background: rgba(248, 250, 252, 0.82);
  border-bottom: 1px solid rgba(230, 234, 242, 0.82);
}
.nav-inner {
  min-height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.brand {
  font-weight: 900;
  letter-spacing: 0.04em;
  color: var(--ink);
}
.navlinks { display: flex; gap: 24px; color: var(--muted); font-size: 16px; font-weight: 750; }
.navlinks a { padding: 8px 2px; }
.navlinks a:hover { color: var(--accent); }

.hero { padding: 66px 0 28px; text-align: center; }
.hero-content { max-width: 1080px; }
.venue {
  display: inline-flex;
  align-items: center;
  margin-top: 18px;
  padding: 7px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.78);
  color: #475467;
  font-weight: 800;
  font-size: 14px;
  box-shadow: var(--shadow-soft);
}
.title {
  max-width: 1030px;
  margin: 0 auto 12px;
  font-size: clamp(36px, 5.6vw, 66px);
  line-height: 1.02;
  letter-spacing: -0.052em;
}
.authors { margin-top: 16px; color: #344054; font-size: 18px; }
.authors a { border-bottom: 1px solid rgba(53,92,255,.35); }
.sep::before { content: ""; display: inline-block; width: 18px; }
.affiliations { margin-top: 6px; color: var(--muted); font-size: 14px; }
.tldr {
  max-width: 920px;
  margin: 18px auto 0;
  color: var(--muted);
  font-size: clamp(16px, 1.8vw, 19px);
}
.tldr span {
  color: var(--ink);
  font-style: normal;
  font-weight: 850;
}
.buttons { display: flex; justify-content: center; flex-wrap: wrap; gap: 12px; margin-top: 23px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 112px;
  padding: 11px 17px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.9);
  box-shadow: var(--shadow-soft);
  font-weight: 800;
  font-size: 14px;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.btn.primary { background: var(--dark); color: #fff; border-color: var(--dark); }
.btn:hover { transform: translateY(-1px); box-shadow: 0 14px 30px rgba(16, 24, 40, 0.14); border-color: rgba(53, 92, 255, 0.35); }
.abstract-card {
  max-width: 1030px;
  margin: 26px auto 0;
  padding: clamp(20px, 3vw, 28px);
  text-align: left;
  background: rgba(255,255,255,0.9);
  border: 1px solid rgba(230,234,242,0.95);
  box-shadow: var(--shadow-soft);
  border-radius: var(--radius);
}
.abstract-card h2 {
  margin: 0 0 10px;
  font-size: 22px;
  line-height: 1.2;
  letter-spacing: -0.02em;
}
.abstract-card p {
  margin: 0;
  color: #344054;
  font-size: 15.8px;
  line-height: 1.68;
}

section { padding: 44px 0; }
.featured-section { padding-top: 22px; }
.center-caption { text-align: center; }

.card, .demo-card {
  background: rgba(255,255,255,0.9);
  border: 1px solid rgba(230,234,242,0.95);
  box-shadow: var(--shadow);
  border-radius: var(--radius);
}
.card { overflow: hidden; }
.card-pad { padding: clamp(20px, 4vw, 34px); }
.section-title {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 18px;
}
.section-title.compact { margin-bottom: 16px; }
.section-title.single-title { display: block; }
.section-note {
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 15px;
}
.qualitative-subsection-title { margin-top: 42px; }
h2 { margin: 0; font-size: clamp(26px, 3.2vw, 38px); line-height: 1.12; letter-spacing: -0.035em; }
h3 { margin: 0 0 7px; font-size: 18px; line-height: 1.25; letter-spacing: -0.012em; }
.kicker { margin: 0 0 8px; color: var(--accent); font-weight: 900; text-transform: uppercase; letter-spacing: .12em; font-size: 12px; }
.caption { color: var(--muted); font-size: 14px; margin: 10px 4px 0; }

.demo-grid { display: grid; gap: 20px; }
.featured-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px; }
.core-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  align-items: stretch;
}
.core-grid .demo-card:nth-child(5) {
  grid-column: 1 / -1;
  justify-self: center;
  width: calc((100% - 24px) / 2);
}
.extra-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  max-width: 1120px;
  margin: 0 auto;
}
.extra-grid .demo-card { height: 100%; }
.demo-card {
  overflow: hidden;
  transition: transform .18s ease, box-shadow .18s ease;
}
.demo-card:hover { transform: translateY(-3px); box-shadow: 0 24px 62px rgba(16, 24, 40, 0.16); }
.demo-card video {
  width: 100%;
  background: #080c18;
  aspect-ratio: 16 / 9;
  object-fit: contain;
  border-bottom: 1px solid rgba(230,234,242,0.95);
}
.featured-card video { min-height: 320px; }
.core-grid video { min-height: 220px; }
.extra-grid video {
  min-height: 0;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  background: transparent;
}
.demo-body { padding: 16px 17px 18px; }
.demo-body p { margin: 0; color: var(--muted); font-size: 14.5px; }
.compact-card .demo-body { padding: 16px 17px 18px; }
.compact-card h3 { font-size: 17px; }
.compact-card p { font-size: 14px; }
.tag-row { display: flex; gap: 8px; flex-wrap: wrap; margin: 12px 0 0; }
.tag { font-size: 12px; color: #334155; background: #f1f5f9; border: 1px solid #e2e8f0; padding: 4px 8px; border-radius: 999px; }

.media-frame { border-radius: 18px; overflow: hidden; background: #0b1020; border: 1px solid rgba(0,0,0,.06); }
.light-frame { background: #fff; }
.media-frame img { width: 100%; height: auto; }
.method-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 17px;
}
.method-steps div {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fbfcff;
}
.method-steps span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 31px;
  height: 31px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 900;
  margin-right: 8px;
}
.method-steps strong { font-size: 16px; }
.method-steps p { margin: 9px 0 0; color: var(--muted); font-size: 14px; }

.bibtex {
  margin: 0;
  background: var(--dark);
  color: #dce6ff;
  padding: 18px;
  border-radius: 16px;
  overflow-x: auto;
  font-size: 13px;
  line-height: 1.45;
}
.copy-btn {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: var(--ink);
  padding: 9px 13px;
  cursor: pointer;
  font-weight: 800;
}
footer { padding: 28px 0 56px; color: var(--muted); text-align: center; font-size: 14px; }

@media (max-width: 1120px) {
  .extra-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .core-grid video { min-height: 240px; }
  .extra-grid video { min-height: 0; }
  .featured-card video { min-height: 260px; }
}

@media (max-width: 820px) {
  .container { width: min(100% - 28px, 1280px); }
  .navlinks { display: none; }
  .hero { padding: 44px 0 18px; }
  .featured-grid, .core-grid, .extra-grid, .method-steps { grid-template-columns: 1fr; }
  .core-grid .demo-card:nth-child(5) { grid-column: auto; width: 100%; }
  .featured-card video, .core-grid video, .extra-grid video { min-height: auto; }
  .section-title { display: block; }
  .title { letter-spacing: -0.04em; }
  .abstract-card { padding: 18px; }
}