:root {
  --bg: #f7f8fb;
  --bg-elev: #ffffff;
  --bg-soft: #eef1f7;
  --text: #0f172a;
  --text-2: #475569;
  --text-3: #94a3b8;
  --border: rgba(15, 23, 42, 0.08);
  --accent: #4f46e5;
  --accent-2: #06b6d4;
  --accent-soft: rgba(79, 70, 229, 0.08);
  --grad: linear-gradient(135deg, #4f46e5 0%, #7c3aed 45%, #06b6d4 100%);
  --shadow: 0 1px 2px rgba(15, 23, 42, 0.04), 0 8px 24px rgba(15, 23, 42, 0.06);
  --shadow-lg: 0 20px 50px -12px rgba(79, 70, 229, 0.25);
  --radius: 16px;
  --maxw: 1120px;
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  color-scheme: light;
}

[data-theme="dark"] {
  --bg: #0b0e17;
  --bg-elev: #121726;
  --bg-soft: #171d2e;
  --text: #e6e9f2;
  --text-2: #a3acc2;
  --text-3: #64708a;
  --border: rgba(255, 255, 255, 0.08);
  --accent: #818cf8;
  --accent-2: #22d3ee;
  --accent-soft: rgba(129, 140, 248, 0.12);
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 8px 24px rgba(0, 0, 0, 0.25);
  --shadow-lg: 0 20px 50px -12px rgba(129, 140, 248, 0.25);
  color-scheme: dark;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; scroll-padding-top: 80px; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  transition: background-color .3s, color .3s;
}

a { color: var(--accent); text-decoration: none; transition: color .2s; }
a:hover { color: var(--accent-2); }

img { max-width: 100%; display: block; }

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

.grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  background: color-mix(in srgb, var(--bg) 75%, transparent);
  border-bottom: 1px solid transparent;
  transition: border-color .3s;
}
.nav.scrolled { border-bottom-color: var(--border); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { font-weight: 700; font-size: 18px; color: var(--text); letter-spacing: -0.01em; display: flex; align-items: center; gap: 10px; }
.brand:hover { color: var(--text); }
.brand-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--grad); box-shadow: 0 0 12px var(--accent); }
.nav-links { display: flex; gap: 4px; align-items: center; list-style: none; }
.nav-links a {
  color: var(--text-2); font-size: 14px; font-weight: 500;
  padding: 8px 14px; border-radius: 999px; transition: all .2s;
}
.nav-links a:hover, .nav-links a.active { color: var(--text); background: var(--accent-soft); }
.icon-btn {
  width: 38px; height: 38px; border-radius: 50%;
  border: 1px solid var(--border); background: var(--bg-elev);
  color: var(--text-2); cursor: pointer; display: grid; place-items: center;
  transition: all .2s; margin-left: 8px;
}
.icon-btn:hover { color: var(--accent); border-color: var(--accent); }
.icon-btn svg { width: 18px; height: 18px; }
.icon-sun { display: none; }
[data-theme="dark"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: none; }
.menu-btn { display: none; }

/* ---------- Hero ---------- */
.hero { position: relative; overflow: hidden; padding: 72px 0 64px; }
#pointcloud {
  position: absolute; top: 0; right: -6%; width: 62%; height: 100%;
  opacity: .55; pointer-events: none;
  mask-image: radial-gradient(closest-side, #000 55%, transparent);
  -webkit-mask-image: radial-gradient(closest-side, #000 55%, transparent);
}
.hero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse at 30% 40%, #000 0%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at 30% 40%, #000 0%, transparent 70%);
}
.hero-grid {
  position: relative; display: grid; grid-template-columns: 300px 1fr;
  gap: 56px; align-items: center;
}
.avatar-wrap { position: relative; width: 280px; height: 280px; }
.avatar-wrap::before {
  content: ""; position: absolute; inset: -6px; border-radius: 32px;
  background: var(--grad); filter: blur(22px); opacity: .45; z-index: 0;
  animation: glow 6s ease-in-out infinite alternate;
}
@keyframes glow { from { opacity: .3; transform: scale(.97); } to { opacity: .55; transform: scale(1.02); } }
.avatar {
  position: relative; z-index: 1; width: 100%; height: 100%;
  object-fit: cover; border-radius: 28px;
  border: 4px solid var(--bg-elev); box-shadow: var(--shadow);
}
.status-pill {
  position: absolute; z-index: 2; bottom: -14px; left: 50%; transform: translateX(-50%);
  display: inline-flex; align-items: center; gap: 8px; white-space: nowrap;
  background: var(--bg-elev); border: 1px solid var(--border); box-shadow: var(--shadow);
  padding: 6px 14px; border-radius: 999px; font-size: 13px; font-weight: 500; color: var(--text-2);
}
.status-pill i { width: 8px; height: 8px; border-radius: 50%; background: #10b981; box-shadow: 0 0 0 4px rgba(16,185,129,.18); }

.eyebrow {
  font-family: var(--mono); font-size: 13px; color: var(--accent);
  letter-spacing: .04em; margin-bottom: 12px; display: inline-block;
}
.hero h1 { font-size: clamp(38px, 5.4vw, 58px); line-height: 1.08; letter-spacing: -0.03em; font-weight: 800; }
.hero .role { font-size: 19px; color: var(--text-2); margin: 14px 0 20px; font-weight: 500; }
.hero .role b { color: var(--text); font-weight: 600; }
.hero .bio { color: var(--text-2); max-width: 640px; }
.hero .bio a { font-weight: 500; }
.hero .bio strong { color: var(--text); font-weight: 600; }

.links { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 28px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 18px; border-radius: 12px; font-size: 14px; font-weight: 600;
  border: 1px solid var(--border); background: var(--bg-elev); color: var(--text);
  transition: transform .2s, box-shadow .2s, border-color .2s;
}
.btn:hover { transform: translateY(-2px); box-shadow: var(--shadow); color: var(--text); border-color: var(--accent); }
.btn svg { width: 17px; height: 17px; }
.btn-primary { background: var(--grad); color: #fff; border: none; }
.btn-primary:hover { color: #fff; box-shadow: var(--shadow-lg); }


/* ---------- Stats (data/scholar.json) ---------- */
.stats {
  position: relative; display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 64px;
}
.stats[hidden], .stats-note[hidden] { display: none; }
.stat {
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 22px 24px; box-shadow: var(--shadow);
}
.stat-num { font-size: 34px; font-weight: 800; letter-spacing: -0.02em; line-height: 1.1; font-variant-numeric: tabular-nums; }
.stat-label { font-size: 13px; color: var(--text-3); font-weight: 500; margin-top: 6px; text-transform: uppercase; letter-spacing: .06em; }
.stat-chart { display: flex; align-items: flex-end; gap: 6px; height: 54px; }
.stat-chart .bar {
  flex: 1; background: var(--grad); border-radius: 4px 4px 2px 2px;
  min-height: 3px; position: relative; opacity: .85; transition: opacity .2s;
}
.stat-chart .bar:hover { opacity: 1; }
.stat-chart .bar::after {
  content: attr(data-y) " · " attr(data-c); position: absolute; bottom: calc(100% + 6px); left: 50%;
  transform: translateX(-50%); font-size: 11px; font-family: var(--mono); white-space: nowrap;
  background: var(--text); color: var(--bg); padding: 2px 6px; border-radius: 6px;
  opacity: 0; pointer-events: none; transition: opacity .15s;
}
.stat-chart .bar:hover::after { opacity: 1; }
.stat-years { display: flex; gap: 6px; margin-top: 6px; }
.stat-years span { flex: 1; text-align: center; font-size: 10px; font-family: var(--mono); color: var(--text-3); }
.stats-note { position: relative; margin-top: 12px; font-size: 12px; font-family: var(--mono); color: var(--text-3); text-align: right; }
.stats-note a { color: var(--text-3); text-decoration: underline; text-underline-offset: 2px; }
.stats-note a:hover { color: var(--accent); }

/* ---------- Sections ---------- */
section.block { padding: 72px 0; }
section.block + section.block { border-top: 1px solid var(--border); }
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; margin-bottom: 32px; flex-wrap: wrap; }
.section-title { font-size: 30px; font-weight: 800; letter-spacing: -0.02em; display: flex; align-items: center; gap: 12px; }
.section-title .idx { font-family: var(--mono); font-size: 14px; font-weight: 500; color: var(--accent); }
.section-sub { color: var(--text-3); font-size: 14px; }

/* Research */
.research-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.r-card {
  position: relative; background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px; overflow: hidden;
  transition: transform .25s, box-shadow .25s, border-color .25s;
}
.r-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: color-mix(in srgb, var(--accent) 40%, transparent); }
.r-icon {
  width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center;
  background: var(--accent-soft); color: var(--accent); margin-bottom: 18px;
}
.r-icon svg { width: 24px; height: 24px; }
.r-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; letter-spacing: -0.01em; }
.r-card p { color: var(--text-2); font-size: 14.5px; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 16px; }
.tag {
  font-size: 12px; font-family: var(--mono); padding: 3px 9px; border-radius: 6px;
  background: var(--bg-soft); color: var(--text-2); border: 1px solid var(--border);
}

/* News */
.news { list-style: none; position: relative; }
.news li {
  display: grid; grid-template-columns: 110px 1fr; gap: 24px; padding: 14px 0;
  border-bottom: 1px dashed var(--border); align-items: baseline;
}
.news li:last-child { border-bottom: none; }
.news time { font-family: var(--mono); font-size: 13px; color: var(--accent); font-weight: 500; }
.news p { color: var(--text-2); }
.news strong { color: var(--text); font-weight: 600; }
.badge-new {
  font-size: 10px; font-weight: 700; padding: 2px 7px; border-radius: 4px; margin-left: 6px;
  background: var(--grad); color: #fff; vertical-align: 2px; letter-spacing: .05em;
}

/* Publications */
.toolbar { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; margin-bottom: 28px; }
.filters { display: flex; gap: 6px; flex-wrap: wrap; background: var(--bg-elev); padding: 5px; border-radius: 12px; border: 1px solid var(--border); }
.filter {
  border: none; background: none; cursor: pointer; font: inherit; font-size: 13.5px; font-weight: 500;
  color: var(--text-2); padding: 7px 14px; border-radius: 8px; transition: all .2s;
}
.filter:hover { color: var(--text); }
.filter.active { background: var(--text); color: var(--bg); }
.filter .cnt { font-family: var(--mono); font-size: 11px; opacity: .6; margin-left: 4px; }
.search {
  flex: 1; min-width: 200px; position: relative;
}
.search input {
  width: 100%; font: inherit; font-size: 14px; color: var(--text);
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: 12px;
  padding: 11px 14px 11px 40px; outline: none; transition: border-color .2s, box-shadow .2s;
}
.search input:focus { border-color: var(--accent); box-shadow: 0 0 0 4px var(--accent-soft); }
.search svg { position: absolute; left: 13px; top: 50%; transform: translateY(-50%); width: 17px; height: 17px; color: var(--text-3); }

.year-group { margin-bottom: 8px; }
.year-label {
  font-family: var(--mono); font-size: 13px; color: var(--text-3); font-weight: 500;
  display: flex; align-items: center; gap: 12px; margin: 26px 0 14px;
}
.year-label::after { content: ""; flex: 1; height: 1px; background: var(--border); }

.pub {
  display: grid; grid-template-columns: 240px 1fr; gap: 24px;
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px; margin-bottom: 14px; transition: transform .25s, box-shadow .25s, border-color .25s;
}
.pub:hover { transform: translateY(-2px); box-shadow: var(--shadow); border-color: color-mix(in srgb, var(--accent) 35%, transparent); }
.pub.hidden { display: none; }
.pub-thumb {
  position: relative; border-radius: 10px; overflow: hidden; aspect-ratio: 16 / 10;
  background: var(--bg-soft); border: 1px solid var(--border);
}
.pub-thumb img {
  position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover;
  transition: transform .5s cubic-bezier(.2, .7, .2, 1);
}
.pub:hover .pub-thumb img { transform: scale(1.05); }
/* Diagram-style figures: show whole image on white instead of cropping */
.pub-thumb.fit { background: #fff; }
.pub-thumb.fit img { object-fit: contain; padding: 8px; }
.pub:hover .pub-thumb.fit img { transform: scale(1.03); }
.pub-venue {
  position: absolute; top: 8px; left: 8px; z-index: 1; font-size: 11px; font-weight: 700; font-family: var(--mono);
  padding: 3px 8px; border-radius: 6px; background: rgba(15,23,42,.78); color: #fff; letter-spacing: .02em;
}
.pub-body { min-width: 0; display: flex; flex-direction: column; }
.pub-title { font-size: 16.5px; font-weight: 700; line-height: 1.4; color: var(--text); letter-spacing: -0.005em; }
.pub-title a { color: inherit; }
.pub-title a:hover { color: var(--accent); }
.pub-authors { font-size: 14px; color: var(--text-2); margin-top: 6px; }
.pub-authors .me { color: var(--text); font-weight: 700; text-decoration: underline; text-decoration-color: var(--accent); text-underline-offset: 3px; text-decoration-thickness: 2px; }
.pub-meta { font-size: 13.5px; color: var(--text-3); margin-top: 4px; font-style: italic; }
.pub-foot { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-top: auto; padding-top: 12px; }
.chip {
  display: inline-flex; align-items: center; gap: 5px; font-size: 12.5px; font-weight: 600;
  padding: 4px 11px; border-radius: 8px; border: 1px solid var(--border); color: var(--text-2);
  background: var(--bg); transition: all .2s;
}
a.chip:hover { color: var(--accent); border-color: var(--accent); background: var(--accent-soft); }
.chip svg { width: 13px; height: 13px; }
.empty { display: none; text-align: center; color: var(--text-3); padding: 40px 0; }

/* Experience */
.timeline { position: relative; padding-left: 28px; }
.timeline::before { content: ""; position: absolute; left: 6px; top: 8px; bottom: 8px; width: 2px; background: linear-gradient(var(--accent), var(--accent-2), transparent); border-radius: 2px; }
.tl-item { position: relative; padding-bottom: 28px; }
.tl-item:last-child { padding-bottom: 0; }
.tl-item::before {
  content: ""; position: absolute; left: -28px; top: 6px; width: 14px; height: 14px; border-radius: 50%;
  background: var(--bg); border: 3px solid var(--accent);
}
.tl-head { display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; align-items: baseline; }
.tl-item h3 { font-size: 17px; font-weight: 700; }
.tl-item .when { font-family: var(--mono); font-size: 13px; color: var(--text-3); }
.tl-item .org { color: var(--accent); font-weight: 500; font-size: 15px; }
.tl-item p { color: var(--text-2); font-size: 14.5px; margin-top: 4px; }

/* Contact */
.contact-card {
  position: relative; overflow: hidden; border-radius: 24px; padding: 48px;
  background: var(--grad); color: #fff; display: grid; grid-template-columns: 1fr auto; gap: 32px; align-items: center;
}
.contact-card::before {
  content: ""; position: absolute; inset: 0; opacity: .18;
  background-image: radial-gradient(#fff 1px, transparent 1.4px); background-size: 18px 18px;
}
.contact-card > * { position: relative; }
.contact-card h2 { font-size: 30px; font-weight: 800; letter-spacing: -0.02em; }
.contact-card p { opacity: .9; margin-top: 8px; max-width: 560px; }
.contact-card .links { margin-top: 0; }
.contact-card .btn { background: rgba(255,255,255,.14); border-color: rgba(255,255,255,.3); color: #fff; backdrop-filter: blur(6px); }
.contact-card .btn:hover { background: #fff; color: #4f46e5; }

footer { padding: 36px 0 48px; color: var(--text-3); font-size: 13px; text-align: center; }
footer a { color: var(--text-2); }

/* Reveal */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .hero-grid { grid-template-columns: 1fr; gap: 40px; text-align: center; }
  .avatar-wrap { margin: 0 auto; width: 220px; height: 220px; }
  .hero .bio { margin: 0 auto; }
  .links { justify-content: center; }
  #pointcloud { width: 100%; right: 0; opacity: .3; }
  .research-grid { grid-template-columns: 1fr; }
  .contact-card { grid-template-columns: 1fr; padding: 36px 28px; }
  .contact-card .links { justify-content: flex-start; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stats-note { text-align: center; }
}
@media (max-width: 760px) {
  .menu-btn { display: grid; }
  .nav-links {
    position: absolute; top: 64px; left: 0; right: 0; flex-direction: column; align-items: stretch;
    background: var(--bg-elev); border-bottom: 1px solid var(--border); padding: 10px 16px 16px;
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 14px; }
  .pub { grid-template-columns: 1fr; }
  .pub-thumb { aspect-ratio: 16 / 9; }
  .news li { grid-template-columns: 1fr; gap: 2px; }
  section.block { padding: 56px 0; }
}
@media (max-width: 480px) {
  .stats { gap: 10px; }
  .stat { padding: 16px; }
  .stat-num { font-size: 26px; }
}
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
  html { scroll-behavior: auto; }
}