:root {
  --bg: #ffffff;
  --bg-alt: #f6f7f9;
  --fg: #1a1d23;
  --muted: #5b6470;
  --accent: #c80000;
  --accent-2: #320000;
  --border: #e3e6ea;
  --radius: 14px;
  --maxw: 1080px;
  --narrow: 760px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "Hanken Grotesk", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--fg);
  background: var(--bg);
  line-height: 1.45;
  -webkit-font-smoothing: antialiased;
}

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

code {
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.88em;
  background: var(--bg-alt);
  padding: 0.1em 0.4em;
  border-radius: 6px;
}

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

/* ===================== HERO ===================== */
.hero {
  text-align: center;
  padding: 84px 0 56px;
  background:
    radial-gradient(900px 360px at 50% -10%, rgba(200, 0, 0, 0.10), transparent 70%),
    var(--bg);
  border-bottom: 1px solid var(--border);
}

.title {
  font-size: clamp(2.2rem, 5vw, 3.9rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  margin: 0 0 2px;
  background: linear-gradient(90deg, var(--accent-2), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.subtitle {
  font-size: clamp(1.45rem, 3.4vw, 2.2rem);
  font-weight: 500;
  line-height: 1.25;
  color: var(--fg);
  margin: 0 auto 30px;
  max-width: 880px;
}

.authors, .affiliations {
  list-style: none;
  padding: 0;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px 20px;
}
.authors { font-size: 1.05rem; font-weight: 600; margin-bottom: 8px; }
.authors a { color: var(--fg); }
.authors a:hover { color: var(--accent); }
.authors sup, .affiliations sup { color: var(--accent); font-weight: 700; }

.affiliations {
  font-size: 0.95rem;
  color: var(--muted);
  margin-bottom: 18px;
}

.venue {
  display: inline-block;
  font-weight: 700;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid rgba(200, 0, 0, 0.35);
  border-radius: 999px;
  padding: 4px 16px;
  margin: 0 0 30px;
}

.links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--fg);
  color: #fff;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 11px 22px;
  border-radius: 999px;
  transition: transform 0.15s ease, background 0.15s ease;
}
.btn:hover {
  background: var(--accent);
  text-decoration: none;
  transform: translateY(-2px);
}
.btn .ico { font-size: 0.9em; line-height: 1; }

/* ===================== SECTIONS ===================== */
.section { padding: 64px 0; }
.section--tight { padding: 40px 0; }
.section--alt { background: var(--bg-alt); border-block: 1px solid var(--border); }

.section h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  text-align: center;
  margin: 0 0 32px;
}

.section p { font-size: 0.95rem; line-height: 1.45; }
.container--narrow p { text-align: justify; }

/* ===================== VIDEO ===================== */
.teaser {
  width: 100%;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: #000;
  box-shadow: 0 20px 50px -28px rgba(0, 0, 0, 0.4);
  display: block;
}

.demo-video {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: #fff;
  box-shadow: 0 20px 50px -28px rgba(0, 0, 0, 0.4);
  display: block;
}

.caption {
  color: var(--muted);
  font-size: 0.97rem !important;
  max-width: 820px;
  margin: 20px auto 0;
  text-align: center;
}

/* ===================== FIGURES ===================== */
figure { margin: 0; }
.media-stack {
  display: grid;
  gap: 18px;
}
figure img {
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: #fff;
}
figcaption {
  color: var(--muted);
  font-size: 0.95rem;
  margin-top: 16px;
  text-align: center;
  max-width: 920px;
  margin-inline: auto;
}

/* ===================== CARDS ===================== */
.cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}
.card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 26px 24px;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}
.section--alt .card { background: #fff; }
.card:hover {
  transform: translateY(-4px);
  box-shadow: 0 18px 40px -26px rgba(0, 0, 0, 0.35);
}
.card__num {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--accent);
  margin-bottom: 10px;
}
.card h3 { font-size: 1.12rem; margin: 0 0 8px; letter-spacing: -0.01em; }
.card p { font-size: 0.97rem !important; color: var(--muted); margin: 0; }

.key-findings-figure {
  margin-top: 24px;
}

@media (min-width: 720px) {
  .cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ===================== BIBTEX ===================== */
.bibtex {
  background: var(--fg);
  color: #e9edf2;
  border-radius: var(--radius);
  padding: 24px;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.55;
}
.bibtex code { background: none; color: inherit; padding: 0; }

/* ===================== FOOTER ===================== */
.footer {
  text-align: center;
  padding: 40px 0;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.92rem;
}
.footer p { margin: 4px 0; }
.footer__fine { font-size: 0.82rem; opacity: 0.8; }

@media (max-width: 600px) {
  .hero { padding: 56px 0 40px; }
  .section { padding: 48px 0; }
}