:root {
  color-scheme: light;
  --bg: #fcfbf9;
  --surface: #ffffff;
  --text: #1d1d1f;
  --muted: #6b6b70;
  --line: #eeeae5;
  --accent: #bf5700;
  --accent-soft: #fff1e6;
  --shadow: 0 1px 2px rgba(60, 40, 20, 0.04), 0 6px 20px rgba(60, 40, 20, 0.05);
  --shadow-hover: 0 2px 4px rgba(60, 40, 20, 0.06), 0 14px 36px rgba(60, 40, 20, 0.09);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 72px; }

body {
  margin: 0;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
p { margin: 0 0 12px; }
.muted { color: var(--muted); font-size: 0.92rem; }

/* Nav */
.topnav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.topnav-inner {
  max-width: 1000px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.brand { font-weight: 700; color: var(--text); letter-spacing: -0.01em; }
.navlinks { display: flex; gap: 24px; }
.navlinks a { color: var(--muted); font-weight: 500; font-size: 0.95rem; }
.navlinks a:hover { color: var(--accent); text-decoration: none; }

/* Hero */
.hero {
  background:
    radial-gradient(900px 400px at 15% 0%, rgba(191, 87, 0, 0.10), transparent 70%),
    radial-gradient(700px 350px at 90% 10%, rgba(255, 179, 102, 0.14), transparent 70%),
    linear-gradient(180deg, #fff7ef, var(--bg));
}
.hero-inner {
  max-width: 1000px;
  margin: 0 auto;
  padding: 64px 24px 48px;
  display: flex;
  gap: 48px;
  align-items: center;
}
.photo {
  width: 220px;
  height: 220px;
  object-fit: cover;
  object-position: center 20%;
  border-radius: 50%;
  flex-shrink: 0;
  border: 5px solid var(--surface);
  box-shadow: 0 0 0 2px var(--accent), var(--shadow-hover);
}
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 4px;
}
h1 { font-size: 3rem; line-height: 1.1; margin: 0 0 6px; letter-spacing: -0.03em; font-weight: 800; }
.tagline { font-size: 1.2rem; color: var(--muted); margin-bottom: 18px; }

.buttons { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.btn {
  padding: 8px 18px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  font-weight: 500;
  font-size: 0.92rem;
  transition: all 0.2s ease;
}
.btn:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; transform: translateY(-1px); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn.primary:hover { color: #fff; filter: brightness(1.08); }

/* Sections */
main { max-width: 1000px; margin: 0 auto; padding: 8px 24px 40px; }
section { margin-top: 48px; }
h2 {
  font-size: 1.6rem;
  letter-spacing: -0.02em;
  margin: 0 0 24px;
  display: flex;
  align-items: center;
  gap: 12px;
}
h2::after { content: ""; flex: 1; height: 1px; background: var(--line); }
h3 { font-size: 1.12rem; line-height: 1.4; margin: 0 0 6px; letter-spacing: -0.01em; }
h3 a { color: var(--text); }
h3 a:hover { color: var(--accent); text-decoration: none; }

/* Timeline (news + education) */
.timeline { list-style: none; margin: 0; padding: 0 0 0 20px; border-left: 2px solid var(--line); }
.timeline li { position: relative; display: grid; grid-template-columns: 130px 1fr; gap: 16px; padding: 0 0 18px 8px; }
.timeline li::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 7px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--surface);
  border: 2px solid var(--accent);
}
.timeline li:first-child::before { background: var(--accent); }
.timeline .date { font-weight: 600; color: var(--muted); font-size: 0.92rem; padding-top: 1px; }
.timeline p { margin: 0; }

/* Research cards */
.card {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 28px;
  padding: 24px;
  margin-bottom: 20px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  box-shadow: var(--shadow);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.card:hover { transform: translateY(-2px); box-shadow: var(--shadow-hover); }
.card img { width: 100%; border-radius: 10px; display: block; }
figure { margin: 0; }
figcaption { font-size: 0.8rem; color: var(--muted); margin-top: 8px; line-height: 1.45; }

.card.featured { grid-template-columns: 1fr; border-color: color-mix(in srgb, var(--accent) 35%, var(--line)); }
.card-body { display: grid; grid-template-columns: 300px 1fr; gap: 28px; }

.demo video {
  width: 100%;
  display: block;
  border-radius: 12px;
  background: #000;
  aspect-ratio: 1526 / 706;
}
.demo-caption { font-size: 0.88rem; color: var(--muted); margin: 10px 0 0; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.live-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #e5484d;
  box-shadow: 0 0 0 0 rgba(229, 72, 77, 0.6);
  animation: pulse 1.8s infinite;
  flex-shrink: 0;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(229, 72, 77, 0.6); }
  70% { box-shadow: 0 0 0 8px rgba(229, 72, 77, 0); }
  100% { box-shadow: 0 0 0 0 rgba(229, 72, 77, 0); }
}

.badges { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 10px; }
.badge {
  font-size: 0.74rem;
  font-weight: 600;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
}
.badge.hot { background: var(--accent); color: #fff; }

.authors { color: var(--muted); font-size: 0.94rem; margin-bottom: 8px; }
.authors b { color: var(--text); }
.venue { color: var(--muted); font-style: italic; font-size: 0.9rem; }

.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 4px; }
.chips a {
  font-size: 0.84rem;
  font-weight: 500;
  padding: 4px 12px;
  border-radius: 8px;
  border: 1px solid var(--line);
  color: var(--text);
  transition: all 0.2s ease;
}
.chips a:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; }

footer { text-align: center; color: var(--muted); font-size: 0.85rem; padding: 32px 24px 48px; }

@media (max-width: 760px) {
  .hero-inner { flex-direction: column; text-align: center; padding: 40px 20px 32px; gap: 24px; }
  .photo { width: 160px; height: 160px; }
  h1 { font-size: 2.3rem; }
  .buttons { justify-content: center; }
  .navlinks { gap: 16px; }
  .card, .card-body { grid-template-columns: 1fr; padding: 18px; gap: 18px; }
  .card-body { padding: 0; }
  .timeline li { grid-template-columns: 1fr; gap: 2px; }
}