:root{
  --bg:#f7f5f2; --surface:#ffffff; --surface-2:#efebe6;
  --ink:#1d2230; --ink-2:#4b5263; --muted:#7b8192; --line:#e3ddd5;
  --plum:#6a3d8f; --plum-ink:#ffffff; --teal:#13807a; --teal-soft:#dcf0ee;
  --rose:#c2456a; --rose-soft:#f8e1e8;
  --shadow:0 1px 2px rgba(29,34,48,.06),0 8px 24px rgba(29,34,48,.06);
  --radius:18px;
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#13121a; --surface:#1b1a24; --surface-2:#24222f;
    --ink:#efedf5; --ink-2:#bdb9cb; --muted:#8e8a9e; --line:#2f2c3b;
    --plum:#c3a2e6; --plum-ink:#16131d; --teal:#6fd3c9; --teal-soft:#16302e;
    --rose:#f08aa8; --rose-soft:#3a1d27;
    --shadow:0 1px 2px rgba(0,0,0,.3),0 8px 24px rgba(0,0,0,.25);
  }
}
:root[data-theme="dark"]{
  --bg:#13121a; --surface:#1b1a24; --surface-2:#24222f;
  --ink:#efedf5; --ink-2:#bdb9cb; --muted:#8e8a9e; --line:#2f2c3b;
  --plum:#c3a2e6; --plum-ink:#16131d; --teal:#6fd3c9; --teal-soft:#16302e;
  --rose:#f08aa8; --rose-soft:#3a1d27;
  --shadow:0 1px 2px rgba(0,0,0,.3),0 8px 24px rgba(0,0,0,.25);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{margin:0;background:var(--bg);color:var(--ink);font-family:"Noto Sans TC","Inter",system-ui,sans-serif;line-height:1.75;font-size:16px;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit}
.wrap{max-width:1120px;margin:0 auto;padding:0 20px}

/* header */
header{position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--bg) 88%,transparent);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;gap:16px;height:64px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;font-weight:900;letter-spacing:.02em}
.brand-mark{display:grid;place-items:center;width:36px;height:36px;border-radius:10px;background:var(--plum);color:var(--plum-ink);font-family:Inter,sans-serif;font-size:14px;flex:none}
.brand > span:last-child{white-space:nowrap}
.brand small{display:block;font-weight:500;font-size:11px;color:var(--muted);letter-spacing:.08em;line-height:1}
.links{display:flex;gap:2px;margin-left:auto}
.links a{text-decoration:none;font-size:15px;padding:6px 11px;border-radius:999px;color:var(--ink-2);white-space:nowrap}
.links a:hover{background:var(--surface-2);color:var(--ink)}
.cta{background:var(--plum);color:var(--plum-ink)!important;font-weight:700}
.cta:hover{opacity:.9;background:var(--plum)!important}
.icon-btn{border:1px solid var(--line);background:var(--surface);color:var(--ink);width:38px;height:38px;border-radius:999px;cursor:pointer;display:grid;place-items:center;font-size:16px;flex:none}
.menu-btn{display:none}
.lang-btn{display:inline-grid;place-items:center;height:38px;padding:0 14px;border-radius:999px;border:1px solid var(--line);background:var(--surface);color:var(--ink);font-weight:700;font-size:14px;text-decoration:none;white-space:nowrap;flex:none}
.lang-btn:hover{background:var(--surface-2)}
html[lang="en"] body{font-family:"Inter","Noto Sans TC",system-ui,sans-serif}

/* hero */
.hero{padding:56px 0 28px}
.hero-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:40px;align-items:center}
.eyebrow{display:inline-flex;gap:8px;align-items:center;font-size:14px;font-weight:700;color:var(--rose);background:var(--rose-soft);padding:6px 14px;border-radius:999px}
.tagline{font-size:clamp(34px,5.2vw,58px);line-height:1.15;margin:18px 0 14px;font-weight:900;letter-spacing:-.01em}
.tagline .x{color:var(--rose);padding:0 .15em}
.tagline .a{color:var(--plum)}
.tagline .b{color:var(--teal)}
.name{font-size:22px;font-weight:700;margin:0;line-height:1.4}
.name .en{font-size:15px;font-weight:500;color:var(--muted);margin-left:6px;white-space:nowrap}
.role{color:var(--ink-2);margin:4px 0 22px}
.lead{color:var(--ink-2);max-width:34em;margin:0 0 26px}
.btns{display:flex;flex-wrap:wrap;gap:12px}
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 22px;border-radius:999px;text-decoration:none;font-weight:700;border:1px solid var(--line);background:var(--surface)}
.btn.primary{background:var(--plum);color:var(--plum-ink);border-color:var(--plum)}
.photo-card{position:relative;border-radius:28px;overflow:hidden;background:#fff;box-shadow:var(--shadow);aspect-ratio:4/5}
.photo-card img{width:100%;height:100%;object-fit:cover;object-position:center 20%}
.photo-tag{position:absolute;left:16px;bottom:16px;right:16px;background:rgba(255,255,255,.93);color:#1d2230;border-radius:14px;padding:10px 14px;font-size:14px;display:flex;gap:10px;align-items:center;box-shadow:0 4px 16px rgba(0,0,0,.1);line-height:1.5}
.photo-tag b{font-size:15px}
.dot{width:10px;height:10px;border-radius:50%;background:#2f9e63;flex:none;box-shadow:0 0 0 4px rgba(47,158,99,.18)}

/* quick cards */
.quick{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin:36px 0 8px}
.qcard{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px;text-decoration:none;box-shadow:var(--shadow);transition:transform .2s}
.qcard:hover{transform:translateY(-3px)}
.qcard .ic{font-size:26px}
.qcard h3{margin:8px 0 2px;font-size:20px;font-weight:900}
.qcard p{margin:0;color:var(--muted);font-size:14px}
.qcard:nth-child(1) h3{color:var(--plum)}
.qcard:nth-child(2) h3{color:var(--teal)}
.qcard:nth-child(3) h3{color:var(--rose)}
.qcard:nth-child(4) h3{color:#b7791f}
:root[data-theme="dark"] .qcard:nth-child(4) h3{color:#f0c06a}

/* sections */
section.block{padding:64px 0 24px}
.sec-head{display:flex;align-items:baseline;gap:14px;margin-bottom:26px;flex-wrap:wrap}
.sec-num{font-family:Inter,sans-serif;font-weight:800;font-size:14px;color:var(--plum-ink);background:var(--plum);border-radius:8px;padding:2px 9px}
.sec-head h2{margin:0;font-size:clamp(24px,3vw,32px);font-weight:900}
.sec-head p{margin:0 0 0 auto;color:var(--muted);font-size:14px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:26px;box-shadow:var(--shadow);min-width:0}
.card h3{margin:0 0 14px;font-size:18px;display:flex;align-items:center;gap:8px}
.grid-2{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.stack{display:grid;gap:20px;margin-top:20px}

/* about */
.bio p{margin:0 0 14px;color:var(--ink-2)}
.chips{display:flex;flex-wrap:wrap;gap:8px;margin-top:6px}
.chip{font-size:13px;padding:4px 12px;border-radius:999px;background:var(--surface-2);color:var(--ink-2);border:1px solid var(--line)}
.chip.a{background:color-mix(in srgb,var(--plum) 12%,transparent);color:var(--plum);border-color:transparent}
.chip.b{background:var(--teal-soft);color:var(--teal);border-color:transparent}
.timeline{list-style:none;margin:0;padding:0}
.timeline li{position:relative;padding:0 0 16px 22px;border-left:2px solid var(--line);margin-left:6px}
.timeline li:last-child{padding-bottom:0}
.timeline li::before{content:"";position:absolute;left:-7px;top:7px;width:12px;height:12px;border-radius:50%;background:var(--surface);border:2px solid var(--muted)}
.timeline li.now::before{background:var(--rose);border-color:var(--rose)}
.timeline .when{font-size:13px;color:var(--muted);font-family:Inter,sans-serif}
.timeline .what{font-weight:700;line-height:1.5}
.timeline .where{color:var(--ink-2);font-size:14px}
.plain{margin:0;padding-left:1.1em;color:var(--ink-2)}
.plain li{margin-bottom:6px}

/* stats */
.stats{display:grid;grid-template-columns:repeat(5,1fr);gap:14px;margin-top:28px}
.stat{background:var(--plum);color:var(--plum-ink);border-radius:var(--radius);padding:22px 18px;text-align:center}
.stat b{display:block;font-family:Inter,sans-serif;font-size:clamp(26px,3vw,36px);line-height:1.1}
.stat span{font-size:13px;opacity:.85}

/* papers */
.paper{display:grid;grid-template-columns:64px 1fr;gap:16px;padding:18px 0;border-top:1px solid var(--line)}
.paper:first-child{border-top:0;padding-top:0}
.paper .yr{font-family:Inter,sans-serif;font-weight:800;color:var(--rose);font-size:18px}
.paper .t{font-weight:700;line-height:1.5}
.paper .au{color:var(--ink-2);font-size:14px;margin-top:2px}
.paper .au b{color:var(--ink)}
.paper .j{color:var(--ink-2);font-size:14px;font-style:italic}
.paper .meta{display:flex;flex-wrap:wrap;gap:6px;margin-top:8px}
.tag{font-size:12px;padding:2px 10px;border-radius:999px;background:var(--surface-2);color:var(--ink-2);font-weight:500}
.tag.hi{background:var(--rose-soft);color:var(--rose);font-weight:700}
.tag.idx{background:color-mix(in srgb,var(--plum) 12%,transparent);color:var(--plum);font-weight:700}
.tag.new{background:var(--teal-soft);color:var(--teal);font-weight:700}
.paper a{color:var(--plum);font-size:13px;word-break:break-all}
.conf{list-style:none;margin:0;padding:0}
.conf li{padding:12px 0;border-top:1px dashed var(--line);font-size:15px;line-height:1.6}
.conf li:first-child{border-top:0;padding-top:0}
.conf .yr{font-family:Inter,sans-serif;font-weight:800;color:var(--rose);margin-right:8px}
.conf .v{display:block;color:var(--muted);font-size:13px}

/* projects */
.proj{padding:14px 0;border-top:1px dashed var(--line)}
.proj:first-of-type{border-top:0;padding-top:0}
.proj .yr{font-size:12px;font-family:Inter,sans-serif;color:var(--muted)}
.proj .t{font-weight:700;line-height:1.5;font-size:15px}
.proj .s{font-size:13px;color:var(--ink-2)}

/* industry */
.svc{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:22px;box-shadow:var(--shadow)}
.svc .ic{font-size:28px}
.svc h4{margin:8px 0 6px;font-size:17px}
.svc p{margin:0;color:var(--ink-2);font-size:14px}
.bars{display:grid;gap:12px}
.bar-row{display:grid;grid-template-columns:150px 1fr 70px;gap:12px;align-items:center;font-size:14px}
.bar{height:12px;border-radius:999px;background:var(--surface-2);overflow:hidden}
.bar i{display:block;height:100%;border-radius:999px;background:var(--teal)}
.bar-row b{font-family:Inter,sans-serif;text-align:right}
.note{font-size:12px;color:var(--muted);margin:12px 0 0}
details.more{margin-top:14px}
details.more summary{cursor:pointer;font-weight:700;color:var(--plum);font-size:14px}
.ptable{width:100%;border-collapse:collapse;font-size:14px;margin-top:12px}
.ptable th,.ptable td{text-align:left;padding:8px 10px;border-top:1px solid var(--line);vertical-align:top}
.ptable th{font-size:12px;color:var(--muted);font-weight:700;border-top:0}
.ptable td.n{font-family:Inter,sans-serif;font-size:12px;color:var(--muted);white-space:nowrap}
.ptable th{white-space:nowrap}
.ptable td:nth-child(2){min-width:220px}
.ptable td.pi{white-space:nowrap}
.ptable td.amt{color:var(--ink);font-weight:700;text-align:right}
.table-scroll{overflow-x:auto}

/* teaching & gallery */
.feature{display:grid;grid-template-columns:1fr 1fr;gap:24px;align-items:center}
.feature img{border-radius:var(--radius);box-shadow:var(--shadow);width:100%;aspect-ratio:4/3;object-fit:cover}
.badge-row{display:flex;flex-wrap:wrap;gap:8px;margin:10px 0 14px}
.gallery{display:grid;grid-template-columns:repeat(4,1fr);grid-auto-rows:190px;gap:12px}
.gallery figure{margin:0;position:relative;border-radius:14px;overflow:hidden;background:var(--surface-2);cursor:zoom-in}
.gallery figure.wide{grid-column:span 2}
.gallery img{width:100%;height:100%;object-fit:cover;transition:transform .3s}
.gallery figure:hover img{transform:scale(1.04)}
.gallery figcaption{position:absolute;left:0;right:0;bottom:0;padding:22px 12px 8px;font-size:13px;color:#fff;background:linear-gradient(transparent,rgba(0,0,0,.65));line-height:1.4}
.filters{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:16px}
.filters button{font:inherit;font-size:14px;padding:5px 14px;border-radius:999px;border:1px solid var(--line);background:var(--surface);color:var(--ink-2);cursor:pointer}
.filters button[aria-pressed="true"]{background:var(--plum);color:var(--plum-ink);border-color:var(--plum);font-weight:700}
.lightbox{position:fixed;inset:0;z-index:100;background:rgba(10,10,15,.88);display:none;place-items:center;padding:24px}
.lightbox.open{display:grid}
.lightbox img{max-height:82vh;border-radius:12px}
.lightbox p{color:#fff;text-align:center;margin:12px 0 0}
.lightbox button{position:absolute;top:16px;right:16px}

/* certs */
.cert{display:grid;grid-template-columns:28px 1fr;gap:10px;padding:10px 0;border-top:1px dashed var(--line);font-size:15px;line-height:1.55}
.cert:first-of-type{border-top:0;padding-top:0}
.cert .s{display:block;color:var(--muted);font-size:13px}

/* contact */
.contact{display:grid;grid-template-columns:1.1fr .9fr;gap:20px}
.contact dl{display:grid;grid-template-columns:90px 1fr;gap:10px 14px;margin:0}
.contact dt{color:var(--muted);font-size:14px}
.contact dd{margin:0;font-weight:500}
.contact a{color:var(--plum)}
footer{border-top:1px solid var(--line);margin-top:64px;padding:28px 0;color:var(--muted);font-size:13px}
footer .wrap{display:flex;flex-wrap:wrap;gap:8px 20px;justify-content:space-between}

/* responsive */
@media (max-width:1020px){
  .links{display:none;position:absolute;top:64px;left:0;right:0;flex-direction:column;background:var(--surface);border-bottom:1px solid var(--line);padding:10px 16px;box-shadow:var(--shadow)}
  .links.open{display:flex}
  .menu-btn{display:grid;margin-left:auto}
  .stats{grid-template-columns:repeat(3,1fr)}
  .gallery{grid-template-columns:repeat(3,1fr)}
}
@media (max-width:760px){
  .wrap{padding:0 16px}
  .hero{padding:32px 0 16px}
  .hero-grid,.grid-2,.grid-3,.feature,.contact{grid-template-columns:1fr}
  .hero-grid .photo-card{max-width:380px;width:100%;margin:0 auto;order:-1}
  .quick{grid-template-columns:1fr 1fr}
  .stats{grid-template-columns:1fr 1fr}
  .gallery{grid-template-columns:1fr 1fr;grid-auto-rows:140px}
  .gallery figure.wide{grid-column:span 2}
  .paper{grid-template-columns:1fr;gap:4px}
  .bar-row{grid-template-columns:96px 1fr 56px}
  .sec-head p{margin-left:0;width:100%}
  .card{padding:20px}
  .brand small{display:none}
}