/* ============ Tokens ============ */
:root {
  --bg: #07080f;
  --bg-2: #0d1020;
  --surface: rgba(255, 255, 255, 0.035);
  --surface-2: rgba(255, 255, 255, 0.06);
  --border: rgba(255, 255, 255, 0.09);
  --border-strong: rgba(255, 255, 255, 0.18);
  --text: #e8eaf4;
  --muted: #9aa0b8;
  --faint: #6b7190;
  --a1: #7c8cff;
  --a2: #22d3ee;
  --a3: #c084fc;
  --gold: #fbbf24;
  --grad: linear-gradient(100deg, var(--a1), var(--a2) 55%, var(--a3));
  --shadow: 0 20px 60px -20px rgba(0, 0, 0, 0.6);
  --img-bg: #ffffff;
  --net: 124, 140, 255;
  --c-coding: #7c8cff;
  --c-env: #22d3ee;
  --c-gui: #c084fc;
  --c-agent: #34d399;
  --c-aiops: #fb923c;
  --c-early: #94a3b8;
  --radius: 18px;
  --maxw: 1180px;
  color-scheme: dark;
}
[data-theme="light"] {
  --bg: #f7f7fb;
  --bg-2: #eef0f8;
  --surface: rgba(255, 255, 255, 0.75);
  --surface-2: #ffffff;
  --border: rgba(20, 24, 60, 0.09);
  --border-strong: rgba(20, 24, 60, 0.18);
  --text: #141831;
  --muted: #555b78;
  --faint: #8a8fa8;
  --a1: #4f5dff;
  --a2: #0891b2;
  --a3: #9333ea;
  --gold: #b45309;
  --shadow: 0 20px 50px -24px rgba(30, 40, 90, 0.25);
  --net: 79, 93, 255;
  --c-coding: #4f5dff;
  --c-env: #0891b2;
  --c-gui: #9333ea;
  --c-agent: #059669;
  --c-aiops: #ea580c;
  --c-early: #64748b;
  color-scheme: light;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 16px/1.65 Inter, system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
body::before {
  content: "";
  position: fixed; inset: 0; z-index: -2;
  background:
    radial-gradient(900px 600px at 85% -10%, color-mix(in srgb, var(--a3) 18%, transparent), transparent 60%),
    radial-gradient(800px 600px at -10% 20%, color-mix(in srgb, var(--a1) 16%, transparent), transparent 60%),
    radial-gradient(700px 500px at 50% 110%, color-mix(in srgb, var(--a2) 10%, transparent), transparent 60%),
    var(--bg);
}
#net { position: fixed; inset: 0; z-index: -1; width: 100%; height: 100%; pointer-events: none; opacity: .55; }
a { color: var(--a2); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }
img { max-width: 100%; display: block; }
svg { stroke: currentColor; fill: none; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
h1, h2, h3, h4 { font-family: "Space Grotesk", Inter, sans-serif; line-height: 1.15; margin: 0; letter-spacing: -0.02em; }
.wrap { 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: fixed; top: 0; left: 0; right: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 14px max(24px, calc((100vw - var(--maxw)) / 2 + 24px));
  transition: background .3s, border-color .3s, padding .3s;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: blur(14px) saturate(1.4);
  -webkit-backdrop-filter: blur(14px) saturate(1.4);
  border-color: var(--border);
  padding-top: 10px; padding-bottom: 10px;
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--text); font: 600 17px "Space Grotesk", sans-serif; }
.brand:hover { text-decoration: none; }
.brand-mark {
  display: grid; place-items: center; width: 32px; height: 32px; border-radius: 9px;
  background: var(--grad); color: #fff; font-size: 13px; font-weight: 700;
}
.nav-links { display: flex; gap: 4px; }
.nav-links a {
  color: var(--muted); font-size: 14.5px; font-weight: 500; padding: 7px 13px; border-radius: 999px;
  transition: color .2s, background .2s;
}
.nav-links a:hover, .nav-links a.active { color: var(--text); background: var(--surface-2); text-decoration: none; }
.nav-actions { display: flex; gap: 6px; }
.icon-btn {
  width: 38px; height: 38px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); display: grid; place-items: center; cursor: pointer;
}
.icon-btn svg { width: 18px; height: 18px; }
.icon-btn:hover { border-color: var(--border-strong); }
[data-theme="dark"] .i-moon, [data-theme="light"] .i-sun { display: none; }
.menu-btn { display: none; }

/* ============ Hero ============ */
.hero { padding: 132px 0 0; position: relative; }
.hero-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 48px; align-items: start; }
.hero h1 { font-size: clamp(48px, 8vw, 92px); font-weight: 700; letter-spacing: -0.04em; }
.hero h1 .cn { font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif; font-weight: 500; font-size: .42em; color: var(--muted); letter-spacing: .08em; vertical-align: middle; margin-left: .3em; }
.hero-lede { color: var(--muted); font-size: 17.5px; max-width: 620px; margin: 0 0 30px; }
.hero-lede strong { color: var(--text); font-weight: 600; }
.hero-cta { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }
.btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 12px 22px; border-radius: 12px;
  font-weight: 600; font-size: 15px; transition: transform .2s, box-shadow .2s, border-color .2s;
}
.btn:hover { text-decoration: none; transform: translateY(-2px); }
.btn.primary { background: var(--grad); color: #fff; box-shadow: 0 10px 30px -10px color-mix(in srgb, var(--a1) 70%, transparent); }
.btn.ghost { border: 1px solid var(--border-strong); color: var(--text); background: var(--surface); }
.socials { display: flex; gap: 6px; margin-left: 6px; }
.socials a {
  width: 42px; height: 42px; display: grid; place-items: center; border-radius: 12px; color: var(--muted);
  border: 1px solid var(--border); background: var(--surface); transition: color .2s, border-color .2s, transform .2s;
}
.socials a:hover { color: var(--text); border-color: var(--border-strong); transform: translateY(-2px); }
.socials svg { width: 19px; height: 19px; }

/* orbit visual */
.hero-card { display: grid; place-items: center; gap: 22px; padding-top: 40px; position: sticky; top: 90px; }
.orbit { position: relative; width: min(420px, 90vw); aspect-ratio: 1; }
.orbit::before, .orbit::after {
  content: ""; position: absolute; border-radius: 50%; border: 1px dashed var(--border-strong);
}
.orbit::before { inset: 6%; animation: spin 60s linear infinite; }
.orbit::after { inset: 24%; border-style: solid; border-color: var(--border); }
@keyframes spin { to { transform: rotate(360deg); } }
.orbit-core {
  position: absolute; inset: 38%; border-radius: 50%; display: grid; place-items: center;
  background: var(--grad); box-shadow: 0 0 80px -10px color-mix(in srgb, var(--a1) 70%, transparent), inset 0 0 30px rgba(255,255,255,.25);
  animation: breathe 5s ease-in-out infinite;
}
.orbit-core span { font: 700 clamp(28px, 4vw, 40px) "Space Grotesk", sans-serif; color: #fff; letter-spacing: -.02em; }
@keyframes breathe { 50% { transform: scale(1.05); } }
.orb {
  position: absolute; transform: translate(-50%, -50%);
  font: 500 12.5px "JetBrains Mono", monospace; white-space: nowrap;
  padding: 7px 12px; border-radius: 999px; background: color-mix(in srgb, var(--bg-2) 85%, transparent);
  border: 1px solid var(--border-strong); color: var(--text); backdrop-filter: blur(6px);
  animation: float 6s ease-in-out infinite;
}
.orb::before { content: ""; display: inline-block; width: 7px; height: 7px; border-radius: 50%; margin-right: 8px; background: var(--dot); vertical-align: 1px; }
@keyframes float { 50% { transform: translate(-50%, calc(-50% - 8px)); } }

/* stats */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 72px; }
.stat {
  padding: 22px 24px; border-radius: var(--radius); border: 1px solid var(--border); background: var(--surface);
  display: flex; flex-direction: column; gap: 4px; position: relative; overflow: hidden;
}
.stat::after { content: ""; position: absolute; left: 0; top: 0; height: 2px; width: 100%; background: var(--grad); opacity: .7; }
.stat b { font: 700 clamp(30px, 3.6vw, 42px) "Space Grotesk", sans-serif; letter-spacing: -.03em; font-variant-numeric: tabular-nums; }
.stat span { color: var(--text); font-weight: 500; font-size: 14.5px; display: flex; flex-direction: column; }
.stat small { color: var(--faint); font-size: 12.5px; font-weight: 400; }

/* marquee */
.marquee {
  margin-top: 56px; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
  overflow: hidden; padding: 16px 0;
  mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent);
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 10%, #000 90%, transparent);
}
.marquee-track { display: flex; gap: 48px; width: max-content; animation: marquee 40s linear infinite; }
.marquee-track span { font: 600 18px "Space Grotesk", sans-serif; color: var(--faint); letter-spacing: .02em; white-space: nowrap; }
@keyframes marquee { to { transform: translateX(-50%); } }

/* ============ Sections ============ */
.section { padding: 120px 0 0; }
.sec-head { max-width: 760px; margin-bottom: 44px; }
.sec-kicker { font: 500 13px "JetBrains Mono", monospace; color: var(--a2); letter-spacing: .04em; }
.sec-head h2 { font-size: clamp(32px, 4.4vw, 50px); font-weight: 700; margin: 12px 0 14px; }
.sec-head p { color: var(--muted); font-size: 17px; margin: 0; }

/* ============ Impact ============ */
.impact-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 18px; }
.impact {
  grid-column: span 2; padding: 28px; border-radius: var(--radius); border: 1px solid var(--border);
  background: var(--surface); position: relative; overflow: hidden; transition: border-color .3s, transform .3s;
}
.impact:hover { border-color: var(--border-strong); transform: translateY(-3px); }
.impact.big { grid-column: span 4; grid-row: span 1; background:
  linear-gradient(140deg, color-mix(in srgb, var(--a1) 14%, transparent), transparent 55%), var(--surface); }
.impact:nth-child(2) { grid-column: span 2; }
.impact-tag { font: 500 12px "JetBrains Mono", monospace; color: var(--gold); text-transform: uppercase; letter-spacing: .06em; margin-bottom: 12px; }
.impact h3 { font-size: 22px; margin-bottom: 14px; }
.impact.big h3 { font-size: clamp(24px, 2.6vw, 32px); }
.impact p { color: var(--muted); margin: 0 0 12px; font-size: 15.5px; }
.impact p b { color: var(--text); font-weight: 600; }
.impact blockquote {
  margin: 0 0 8px; padding: 16px 20px; border-left: 3px solid var(--a2); border-radius: 0 12px 12px 0;
  background: var(--surface-2); font-size: 16.5px; font-style: italic; color: var(--text);
}
.impact .cite { font-size: 13.5px; color: var(--faint); margin-bottom: 16px; }
.shot { margin: 0 0 14px; border-radius: 12px; overflow: hidden; border: 1px solid var(--border); background: #000; }
.repo-list { list-style: none; margin: 0; padding: 0; }
.repo-list li { display: flex; justify-content: space-between; gap: 10px; padding: 9px 0; border-bottom: 1px dashed var(--border); font: 500 14px "JetBrains Mono", monospace; flex-wrap: wrap; }
.repo-list li:last-child { border: 0; }
.repo-list span { color: var(--gold); }
.chips { display: flex; flex-wrap: wrap; gap: 6px; }
.chips span { font: 500 12px "JetBrains Mono", monospace; padding: 5px 10px; border-radius: 999px; border: 1px solid var(--border); color: var(--muted); }
.link-arrow { font-weight: 600; font-size: 15px; }
.link-arrow::after { content: " →"; }

/* ============ Research ============ */
/* ============ Projects ============ */
.chips-filter button {
  font: 500 14px Inter, sans-serif; padding: 8px 16px; border-radius: 999px; cursor: pointer;
  border: 1px solid var(--border); background: var(--surface); color: var(--muted); transition: all .2s;
}
.chips-filter button:hover { color: var(--text); border-color: var(--border-strong); }
.chips-filter button.on { background: var(--text); color: var(--bg); border-color: var(--text); }
.projects { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.proj {
  display: flex; flex-direction: column; border-radius: var(--radius); border: 1px solid var(--border);
  background: var(--surface); overflow: hidden; transition: transform .3s, border-color .3s, box-shadow .3s;
}
.proj:hover { transform: translateY(-4px); border-color: var(--border-strong); box-shadow: var(--shadow); }
.proj.wide { grid-column: span 3; flex-direction: row; }
.proj.wide .proj-media { flex: 1.1; aspect-ratio: auto; min-height: 260px; }
.proj.wide .proj-body { flex: 1; padding: 32px; }
.proj.wide h3 { font-size: 26px; }
.proj-media { background: var(--img-bg); aspect-ratio: 16 / 8; display: grid; place-items: center; padding: 14px; border-bottom: 1px solid var(--border); }
.proj.wide .proj-media { border-bottom: 0; border-right: 1px solid var(--border); }
.proj-media img { max-height: 100%; width: 100%; object-fit: contain; }
.proj-body { padding: 22px 24px 24px; display: flex; flex-direction: column; flex: 1; }
.proj-body.only-text { background: linear-gradient(160deg, color-mix(in srgb, var(--a1) 10%, transparent), transparent 60%); }
.proj-meta { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 12px; }
.venue { font: 500 11.5px "JetBrains Mono", monospace; padding: 4px 9px; border-radius: 6px; background: var(--surface-2); color: var(--muted); border: 1px solid var(--border); }
.role { font: 600 11.5px "JetBrains Mono", monospace; padding: 4px 9px; border-radius: 6px; text-transform: uppercase; letter-spacing: .05em; }
.role.lead { background: color-mix(in srgb, var(--gold) 18%, transparent); color: var(--gold); border: 1px solid color-mix(in srgb, var(--gold) 40%, transparent); }
.proj h3 { font-size: 20px; margin-bottom: 10px; }
.proj p { color: var(--muted); font-size: 14.8px; margin: 0 0 16px; }
.proj p b { color: var(--text); }
.mini { margin: 0 0 8px; padding-left: 18px; color: var(--muted); font-size: 14.3px; }
.mini li { margin-bottom: 6px; }
.mini b { color: var(--text); }
.proj-links { display: flex; flex-wrap: wrap; gap: 8px; margin-top: auto; }
.proj-links a {
  font: 500 13px Inter, sans-serif; padding: 6px 12px; border-radius: 8px; border: 1px solid var(--border);
  color: var(--text); background: var(--surface-2); transition: border-color .2s, color .2s;
}
.proj-links a:hover { text-decoration: none; border-color: var(--a2); color: var(--a2); }

/* ============ Publications ============ */
.pub-tools { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; margin-bottom: 10px; }
.search { position: relative; flex: 1 1 280px; max-width: 380px; }
.search svg { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); width: 17px; height: 17px; color: var(--faint); }
.search input {
  width: 100%; padding: 11px 14px 11px 40px; border-radius: 12px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); font: 400 15px Inter, sans-serif; outline: none;
}
.search input:focus { border-color: var(--a2); }
.chips-filter { display: flex; flex-wrap: wrap; gap: 6px; }
.chips-filter button { font-size: 13px; padding: 7px 13px; }
.chips-filter button i { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 7px; vertical-align: 1px; }
.toggle { display: flex; align-items: center; gap: 8px; font-size: 14px; color: var(--muted); cursor: pointer; user-select: none; }
.toggle input { accent-color: var(--a1); width: 16px; height: 16px; }
.pub-count { color: var(--faint); font: 400 13px "JetBrains Mono", monospace; margin: 8px 0 18px; }
.pub-year { display: grid; grid-template-columns: 90px 1fr; gap: 18px; padding: 18px 0; border-top: 1px solid var(--border); }
.pub-year > h3 { font: 700 26px "Space Grotesk", sans-serif; color: var(--faint); position: sticky; top: 84px; align-self: start; }
.pub { padding: 12px 16px; margin: 0 -16px; border-radius: 12px; transition: background .2s; position: relative; }
.pub:hover { background: var(--surface); }
.pub::before { content: ""; position: absolute; left: 0; top: 18px; width: 3px; height: 18px; border-radius: 2px; background: var(--c); }
.pub-t { font-weight: 600; font-size: 15.5px; color: var(--text); }
.pub-t a { color: inherit; }
.pub-t a:hover { color: var(--a2); }
.pub-au { color: var(--muted); font-size: 13.8px; margin-top: 3px; }
.pub-au b { color: var(--text); font-weight: 600; text-decoration: underline; text-decoration-color: var(--a2); text-underline-offset: 3px; }
.pub-m { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 7px; align-items: center; }
.pub-m .venue.top { color: var(--text); border-color: color-mix(in srgb, var(--c) 50%, transparent); background: color-mix(in srgb, var(--c) 12%, transparent); }
.badge { font: 600 11px "JetBrains Mono", monospace; padding: 3px 8px; border-radius: 6px; text-transform: uppercase; letter-spacing: .04em; }
.badge.lead { color: var(--gold); background: color-mix(in srgb, var(--gold) 15%, transparent); }
.badge.first { color: var(--a2); background: color-mix(in srgb, var(--a2) 13%, transparent); }
.cites { font: 400 12px "JetBrains Mono", monospace; color: var(--faint); }
.empty { color: var(--faint); padding: 30px 0; }

/* ============ Experience ============ */
.two-col { display: grid; grid-template-columns: 1.15fr 1fr; gap: 64px; }
.timeline { list-style: none; margin: 0; padding: 0 0 0 26px; border-left: 1px solid var(--border-strong); }
.timeline li { position: relative; padding: 0 0 30px; }
.timeline li::before {
  content: ""; position: absolute; left: -33px; top: 5px; width: 13px; height: 13px; border-radius: 50%;
  background: var(--bg); border: 2px solid var(--a2);
}
.timeline li:first-child::before { background: var(--a2); box-shadow: 0 0 0 5px color-mix(in srgb, var(--a2) 20%, transparent); }
.when { font: 500 12.5px "JetBrains Mono", monospace; color: var(--a2); }
.timeline h4 { font-size: 19px; margin: 4px 0 2px; }
.org { color: var(--text); opacity: .8; margin: 0 0 6px; font-size: 14.8px; }
.timeline p:not(.org) { color: var(--muted); margin: 0; font-size: 14.5px; }
.contact-card { margin-top: 32px; padding: 26px; border-radius: var(--radius); border: 1px solid var(--border);
  background: linear-gradient(140deg, color-mix(in srgb, var(--a3) 14%, transparent), transparent 60%), var(--surface); }
.contact-card h3 { font-size: 20px; margin-bottom: 8px; }
.contact-card p { color: var(--muted); margin: 0 0 16px; font-size: 15px; }

/* ============ Footer ============ */
.footer { margin-top: 120px; padding: 28px 0; border-top: 1px solid var(--border); color: var(--faint); font-size: 13.5px; }
.footer .wrap { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }

/* ============ Reveal ============ */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}

/* ============ Hero: role & bio ============ */
.hero-role { margin: 22px 0 26px; padding-left: 18px; position: relative; display: grid; gap: 4px; }
.hero-role::before { content: ""; position: absolute; left: 0; top: 4px; bottom: 4px; width: 3px; border-radius: 3px; background: var(--grad); }
.role-title { font: 600 clamp(23px, 2.7vw, 31px)/1.2 "Space Grotesk", "Noto Sans SC", sans-serif; letter-spacing: -.01em; color: var(--text); }
.role-org { font-size: clamp(16px, 1.6vw, 18.5px); color: var(--text); opacity: .88; }
.role-org b { font-weight: 600; }
.role-prev { font-size: 14.5px; color: var(--muted); margin-top: 2px; }
.hero-bio { max-width: 680px; margin: 0 0 30px; }
.hero-bio p { color: var(--muted); font-size: 16.5px; line-height: 1.72; margin: 0 0 14px; }
.hero-bio strong { color: var(--text); font-weight: 600; }
:lang(zh) .hero-bio p { font-size: 16px; line-height: 1.85; }

/* orbit: inner ring = core research, outer ring = application scenarios */
.orb.in-ring { border-color: color-mix(in srgb, var(--a1) 60%, transparent); background: color-mix(in srgb, var(--a1) 16%, var(--bg-2)); font-weight: 600; }
.o1 { left: 50%; top: 24%; --dot: var(--c-agent); }
.o2 { left: 73%; top: 63%; --dot: var(--c-agent); animation-delay: -1s; }
.o3 { left: 27%; top: 63%; --dot: var(--c-agent); animation-delay: -2s; }
.o4 { left: 88%; top: 28%; --dot: var(--c-coding); animation-delay: -3s; }
.o5 { left: 50%; top: 94%; --dot: var(--c-aiops); animation-delay: -4s; }
.o6 { left: 12%; top: 28%; --dot: var(--c-gui); animation-delay: -5s; }
.orbit-legend { display: flex; gap: 18px; font: 500 12px "JetBrains Mono", "Noto Sans SC", monospace; color: var(--faint); margin-top: 6px; }
.orbit-legend i { display: inline-block; width: 10px; height: 10px; border-radius: 50%; margin-right: 7px; vertical-align: -1px; }
.orbit-legend .lg-in i { background: color-mix(in srgb, var(--a1) 45%, transparent); border: 1px solid var(--a1); }
.orbit-legend .lg-out i { border: 1px dashed var(--border-strong); }

/* nav language switch */
.lang-btn { width: auto; padding: 0 12px; font: 600 13px Inter, "Noto Sans SC", sans-serif; color: var(--text); }
.lang-btn:hover { text-decoration: none; }

/* ============ Research program ============ */
.north {
  padding: 30px 32px; border-radius: var(--radius); margin-bottom: 18px; position: relative; overflow: hidden;
  border: 1px solid color-mix(in srgb, var(--a1) 40%, transparent);
  background: linear-gradient(120deg, color-mix(in srgb, var(--a1) 16%, transparent), color-mix(in srgb, var(--a3) 10%, transparent) 60%, transparent), var(--surface);
}
.lbl { font: 500 12px "JetBrains Mono", "Noto Sans SC", monospace; letter-spacing: .06em; text-transform: uppercase; color: var(--gold); }
.north h3 { font-size: clamp(22px, 2.6vw, 30px); margin: 10px 0 10px; }
.north p { color: var(--muted); margin: 0; max-width: 860px; font-size: 15.5px; }
.core-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.core {
  padding: 28px; border-radius: var(--radius); border: 1px solid var(--border); background: var(--surface);
  position: relative; overflow: hidden; transition: border-color .3s, transform .3s; display: flex; flex-direction: column;
}
.core:hover { transform: translateY(-3px); border-color: color-mix(in srgb, var(--c) 50%, transparent); }
.core::before {
  content: ""; position: absolute; width: 220px; height: 220px; right: -70px; top: -70px; border-radius: 50%;
  background: radial-gradient(circle, color-mix(in srgb, var(--c) 28%, transparent), transparent 70%);
}
.core .lbl { color: var(--c); }
.core h3 { font-size: 23px; margin: 10px 0 10px; }
.core p { color: var(--muted); font-size: 15px; margin: 0 0 16px; }
.core p b { color: var(--text); font-weight: 600; }
.keys { display: flex; flex-wrap: wrap; gap: 6px; margin-top: auto; }
.keys a, .keys span { font-size: 12.5px; padding: 4px 10px; border-radius: 7px; background: var(--surface-2); color: var(--text); border: 1px solid var(--border); }
.keys a:hover { text-decoration: none; border-color: var(--a2); color: var(--a2); }
.built-on { display: flex; align-items: center; gap: 12px; margin: 14px 0; color: var(--faint); font: 500 12px "JetBrains Mono", "Noto Sans SC", monospace; letter-spacing: .06em; text-transform: uppercase; }
.built-on::before, .built-on::after { content: ""; flex: 1; border-top: 1px dashed var(--border-strong); }
.foundation {
  padding: 26px 28px; border-radius: var(--radius); border: 1px solid var(--border);
  background: repeating-linear-gradient(135deg, transparent 0 14px, color-mix(in srgb, var(--c-env) 5%, transparent) 14px 15px), var(--surface);
  display: grid; grid-template-columns: 1fr 1.25fr; gap: 28px; align-items: center;
}
.foundation .lbl { color: var(--c-env); }
.foundation h3 { font-size: 21px; margin: 8px 0 8px; }
.foundation p { color: var(--muted); font-size: 14.8px; margin: 0; }
.found-items { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.found-items a { display: block; padding: 12px 14px; border-radius: 12px; border: 1px solid var(--border); background: var(--surface-2); color: var(--text); transition: border-color .2s; }
.found-items a:hover { text-decoration: none; border-color: var(--c-env); }
.found-items b { display: block; font: 600 14.5px "Space Grotesk", sans-serif; }
.found-items span { display: block; font-size: 12.8px; line-height: 1.45; color: var(--muted); margin-top: 2px; }

.sub-h { font-size: clamp(22px, 2.4vw, 28px); margin: 64px 0 8px; }
.sub-p { color: var(--muted); margin: 0 0 24px; max-width: 820px; font-size: 16px; }
.approach { display: grid; gap: 12px; }
.ap-head, .ap-row { display: grid; grid-template-columns: 1fr 26px 1fr 26px 1fr; }
.ap-head { font: 500 12px "JetBrains Mono", "Noto Sans SC", monospace; letter-spacing: .06em; text-transform: uppercase; color: var(--faint); }
.ap-head span { padding-left: 18px; }
.ap-row > div { padding: 16px 18px; border-radius: 14px; border: 1px solid var(--border); background: var(--surface); font-size: 14.5px; color: var(--muted); }
.ap-row > div b { display: block; color: var(--text); font: 600 15px "Space Grotesk", "Noto Sans SC", sans-serif; margin-bottom: 3px; }
.ap-row > div.res { border-color: color-mix(in srgb, var(--gold) 35%, transparent); background: color-mix(in srgb, var(--gold) 6%, var(--surface)); }
.ap-row > .arr { border: 0; background: none; padding: 0; display: grid; place-items: center; color: var(--faint); font-size: 18px; }

.scen-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.scen { padding: 24px; border-radius: var(--radius); border: 1px solid var(--border); background: var(--surface); border-top: 3px solid var(--c); display: flex; flex-direction: column; }
.scen .lbl { color: var(--c); }
.scen h3 { font-size: 20px; margin: 8px 0 8px; }
.scen p { color: var(--muted); font-size: 14.5px; margin: 0 0 14px; }

/* selected publications footer */
.pub-more { display: flex; justify-content: center; margin-top: 28px; }

/* ============ Join us ============ */
.join { padding: 30px; border-radius: var(--radius); border: 1px solid color-mix(in srgb, var(--a3) 35%, transparent);
  background: linear-gradient(140deg, color-mix(in srgb, var(--a3) 16%, transparent), color-mix(in srgb, var(--a1) 8%, transparent) 60%, transparent), var(--surface); }
.join h3 { font-size: 24px; margin: 8px 0 10px; }
.join > p { color: var(--muted); margin: 0 0 18px; font-size: 15.5px; }
.join ul { list-style: none; margin: 0 0 22px; padding: 0; display: grid; gap: 10px; }
.join li { padding: 14px 16px; border-radius: 12px; border: 1px solid var(--border); background: var(--surface-2); font-size: 14.5px; color: var(--muted); }
.join li b { display: block; color: var(--text); font: 600 15.5px "Space Grotesk", "Noto Sans SC", sans-serif; margin-bottom: 2px; }
.svc-note { margin-top: 26px; color: var(--muted); font-size: 14.5px; padding-top: 18px; border-top: 1px dashed var(--border); }
.svc-note b { color: var(--text); font-weight: 600; }

/* publications page */
.page-head { padding: 130px 0 0; }

/* ============ Responsive ============ */
@media (max-width: 1000px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-card { display: none; }
  .core-grid, .foundation { grid-template-columns: 1fr; }
  .scen-grid { grid-template-columns: 1fr 1fr; }
  .impact-grid { grid-template-columns: 1fr 1fr; }
  .impact, .impact.big, .impact:nth-child(2) { grid-column: span 2; grid-row: auto; }
  .impact:nth-child(n+3) { grid-column: span 1; }
  .projects { grid-template-columns: 1fr 1fr; }
  .proj.wide { grid-column: span 2; }
  .two-col { grid-template-columns: 1fr; gap: 20px; }
}
@media (max-width: 760px) {
  .nav-links {
    position: fixed; top: 64px; left: 16px; right: 16px; flex-direction: column; padding: 10px;
    background: var(--bg-2); border: 1px solid var(--border); border-radius: 16px; box-shadow: var(--shadow);
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 14px; }
  .menu-btn { display: grid; }
  .wrap { padding: 0 16px; }
  .nav { padding-left: 16px; padding-right: 16px; }
  .hero { padding-top: 110px; }
  .stats { grid-template-columns: 1fr 1fr; margin-top: 48px; }
  .impact-grid, .projects { grid-template-columns: 1fr; }
  .impact, .impact.big, .impact:nth-child(2), .impact:nth-child(n+3), .proj.wide { grid-column: span 1; }
  .proj.wide { flex-direction: column; }
  .proj.wide .proj-media { border-right: 0; border-bottom: 1px solid var(--border); min-height: 0; aspect-ratio: 16 / 8; }
  .proj.wide .proj-body { padding: 22px 24px 24px; }
  .section { padding-top: 88px; }
  .pub-year { grid-template-columns: 1fr; gap: 4px; }
  .pub-year > h3 { position: static; font-size: 22px; }
  .socials { margin-left: 0; }
  .scen-grid, .found-items { grid-template-columns: 1fr; }
  .ap-head { display: none; }
  .ap-row { grid-template-columns: 1fr; }
  .ap-row > .arr { transform: rotate(90deg); height: 22px; }
  .north, .core, .foundation, .join { padding: 22px; }
}

/* wide text-only project card */
.proj.wide.textonly .proj-body { padding: 30px 32px; }
.proj.wide.textonly .mini { columns: 2; column-gap: 40px; }
.proj.wide.textonly .mini li { break-inside: avoid; }
@media (max-width: 760px) { .proj.wide.textonly .mini { columns: 1; } }

/* keep project images inside a fixed frame */
.proj-media { position: relative; overflow: hidden; }
.proj-media img { position: absolute; inset: 14px; width: calc(100% - 28px); height: calc(100% - 28px); max-height: none; object-fit: contain; }

/* Chinese pages: Noto Sans SC for CJK glyphs */
:lang(zh) body { font-family: Inter, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif; }
:lang(zh) h1, :lang(zh) h2, :lang(zh) h3, :lang(zh) h4 { font-family: "Space Grotesk", "Noto Sans SC", sans-serif; letter-spacing: 0; }

/* awards, folded year label, service & honors lists */
.badge.award { color: var(--gold); background: color-mix(in srgb, var(--gold) 12%, transparent); border: 1px solid color-mix(in srgb, var(--gold) 35%, transparent); text-transform: none; letter-spacing: 0; font-family: Inter, "Noto Sans SC", sans-serif; }
.pub-year > h3 small { display: block; font: 500 13px Inter, "Noto Sans SC", sans-serif; color: var(--faint); margin-top: 4px; letter-spacing: 0; }
.timeline .mentor { color: var(--muted); font-size: 14px; margin: 2px 0 0; }
.timeline .mentor a { color: var(--a2); }
.cv-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.cv-list li { display: grid; grid-template-columns: 92px 1fr; gap: 14px; padding: 12px 16px; border: 1px solid var(--border); border-radius: 12px; background: var(--surface); font-size: 14.3px; color: var(--muted); }
.cv-list li > span:first-child { font: 500 12.5px "JetBrains Mono", monospace; color: var(--a2); padding-top: 2px; }
.cv-list b { color: var(--text); font-weight: 600; }
.cv-h { font-size: 20px; margin: 40px 0 14px; }
@media (max-width: 760px) { .cv-list li { grid-template-columns: 1fr; gap: 2px; } }
.join ul.join-grid { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 1000px) { .join ul.join-grid { grid-template-columns: 1fr; } }
.hero-bio a { color: inherit; text-decoration: underline; text-decoration-color: var(--a2); text-underline-offset: 3px; }
.timeline .org a { color: inherit; text-decoration: underline; text-decoration-color: var(--a2); text-underline-offset: 3px; }