:root {
  color-scheme: light;
  --bg: #f7f8fa;
  --surface: #ffffff;
  --text: #1c2128;
  --muted: #57606a;
  --faint: #8b949e;
  --accent: #2563eb;
  --accent-soft: #eff4ff;
  --rule: #e4e8ee;
  --shadow: 0 1px 3px rgba(16, 24, 40, 0.07), 0 1px 2px rgba(16, 24, 40, 0.05);
  --shadow-hover: 0 8px 24px rgba(16, 24, 40, 0.11);
  --hero-grad: linear-gradient(135deg, #f0f5ff 0%, #f7f8fa 55%, #eef9f5 100%);
  --thumb-bg: #f1f3f7;
  --chip-cv-bg: #e3edff;    --chip-cv-fg: #1d4ed8;
  --chip-ml-bg: #f0e9ff;    --chip-ml-fg: #6d28d9;
  --chip-gfx-bg: #dff5f2;   --chip-gfx-fg: #0f766e;
  --chip-bld-bg: #e5f5e0;   --chip-bld-fg: #3f6212;
  --chip-tr-bg: #eceff3;    --chip-tr-fg: #57606a;
  --chip-award-bg: #fff3d6; --chip-award-fg: #92610a;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 4.5rem; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;
  line-height: 1.6;
  font-size: 1rem;
  -webkit-font-smoothing: antialiased;
}

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

.container { max-width: 58rem; margin: 0 auto; padding: 0 1.25rem; }

/* ---------- top nav ---------- */
.topnav {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule);
}
.topnav .container {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  height: 3.25rem;
}
.topnav .brand { font-weight: 700; color: var(--text); letter-spacing: -0.01em; }
.topnav .links { margin-left: auto; display: flex; gap: 1.1rem; }
.topnav .links a {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 500;
}
.topnav .links a:hover { color: var(--accent); text-decoration: none; }

/* ---------- hero ---------- */
.hero { background: var(--hero-grad); border-bottom: 1px solid var(--rule); }
.hero .container { padding-top: 3.5rem; padding-bottom: 2.75rem; }
.hero h1 {
  margin: 0 0 0.4rem;
  font-size: clamp(2.1rem, 5vw, 3rem);
  letter-spacing: -0.03em;
  line-height: 1.1;
}
.hero .tagline { margin: 0 0 0.4rem; font-size: 1.15rem; color: var(--muted); }
.hero .tagline strong { color: var(--text); font-weight: 600; }
.hero .interests { margin: 0 0 1.4rem; color: var(--faint); font-size: 0.98rem; }
.hero-links { display: flex; flex-wrap: wrap; gap: 0.6rem; }
.hero-links a {
  display: inline-block;
  padding: 0.42rem 0.95rem;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--rule);
  box-shadow: var(--shadow);
  color: var(--text);
  font-size: 0.9rem;
  font-weight: 500;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}
.hero-links a:hover {
  text-decoration: none;
  transform: translateY(-1px);
  box-shadow: var(--shadow-hover);
  color: var(--accent);
}

/* ---------- sections ---------- */
section { padding-top: 2.75rem; }
section:last-of-type { padding-bottom: 2.75rem; }
h2 {
  font-size: 1.6rem;
  letter-spacing: -0.02em;
  margin: 0 0 0.4rem;
}
h2::after {
  content: "";
  display: block;
  width: 2.6rem;
  height: 4px;
  margin-top: 0.45rem;
  border-radius: 2px;
  background: var(--accent);
}
.section-note { margin: 0 0 1.5rem; color: var(--faint); font-size: 0.92rem; }

#about p { max-width: 46rem; font-size: 1.05rem; }

/* ---------- publication cards ---------- */
.pub {
  display: grid;
  grid-template-columns: 215px 1fr;
  gap: 1.1rem;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 1rem;
  margin-bottom: 1rem;
  transition: box-shadow 0.15s ease, transform 0.15s ease;
}
.pub:hover { box-shadow: var(--shadow-hover); transform: translateY(-2px); }
.pub.no-thumb { grid-template-columns: 1fr; }

.thumb {
  align-self: start;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--thumb-bg);
  border-radius: 8px;
  overflow: hidden;
  min-height: 100px;
  max-height: 150px;
}
.thumb img { max-width: 100%; max-height: 150px; object-fit: contain; display: block; }

.pub h3 { margin: 0 0 0.3rem; font-size: 1.08rem; line-height: 1.4; }
.pub h3 a { color: var(--text); }
.pub h3 a:hover { color: var(--accent); text-decoration: none; }
.pub .authors { margin: 0 0 0.45rem; color: var(--muted); font-size: 0.92rem; }
.pub .authors strong { color: var(--text); font-weight: 600; }
.pub .abstract { margin: 0.5rem 0 0; color: var(--muted); font-size: 0.92rem; }

.meta { display: flex; flex-wrap: wrap; align-items: center; gap: 0.45rem; margin: 0 0 0.15rem; }
.chip {
  display: inline-block;
  padding: 0.14rem 0.62rem;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  white-space: nowrap;
}
.chip.cv  { background: var(--chip-cv-bg);  color: var(--chip-cv-fg); }
.chip.ml  { background: var(--chip-ml-bg);  color: var(--chip-ml-fg); }
.chip.gfx { background: var(--chip-gfx-bg); color: var(--chip-gfx-fg); }
.chip.bld { background: var(--chip-bld-bg); color: var(--chip-bld-fg); }
.chip.tr  { background: var(--chip-tr-bg);  color: var(--chip-tr-fg); }
.chip.award { background: var(--chip-award-bg); color: var(--chip-award-fg); }
.meta .venue-detail { color: var(--faint); font-size: 0.85rem; }

.links { display: flex; flex-wrap: wrap; gap: 0.45rem; margin-top: 0.55rem; }
.links a {
  display: inline-block;
  padding: 0.16rem 0.7rem;
  border-radius: 6px;
  border: 1px solid var(--rule);
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 500;
}
.links a:hover { text-decoration: none; border-color: var(--accent); }

/* ---------- contact / footer ---------- */
#contact .card {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 1.25rem 1.5rem;
  max-width: 28rem;
}
#contact .card p { margin: 0.2rem 0; font-size: 1rem; }
#contact .card .label { color: var(--faint); font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.06em; }

footer {
  border-top: 1px solid var(--rule);
  margin-top: 3rem;
}
footer .container {
  padding-top: 1.25rem;
  padding-bottom: 2.5rem;
  color: var(--faint);
  font-size: 0.88rem;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem;
}

/* ---------- responsive ---------- */
@media (max-width: 640px) {
  .pub { grid-template-columns: 1fr; }
  .thumb { max-height: 190px; }
  .thumb img { max-height: 190px; }
  .topnav .links { gap: 0.8rem; }
  .topnav .links a { font-size: 0.82rem; }
}