:root{--bg:#ffffff;--ink:#222;--muted:#666;--light:#f5f5f5;--line:#e8e8e8;--accent:#2f5d7c;--surface:#ffffff;--surface-alt:#fafafa;--sidebar-w:380px;--container:1080px}
[data-theme="dark"]{--bg:#111318;--ink:#dfe1e8;--muted:#7f8898;--light:#1c1f28;--line:#2a2d38;--accent:#5b9abd;--surface:#1c1f28;--surface-alt:#161820}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;display:grid;grid-template-columns:var(--sidebar-w) 1fr;min-height:100vh;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;line-height:1.75;font-size:16px}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}

/* ── Sidebar ── */
.sidebar{position:sticky;top:0;height:100vh;overflow-y:auto;border-right:1px solid var(--line);background:var(--surface);flex-shrink:0}
.sidebar-inner{display:flex;flex-direction:column;align-items:center;gap:18px;padding:44px 28px 32px;min-height:100%}
.portrait{width:180px;height:180px;object-fit:cover;border-radius:50%;border:2px solid var(--line);box-shadow:0 4px 18px rgba(0,0,0,.09);display:block;flex-shrink:0}
.sidebar-name{font-family:Georgia,"Times New Roman",serif;font-size:1.2rem;font-weight:500;margin:0;text-align:center;color:var(--ink);line-height:1.3}
.sidebar-role{font-size:.78rem;color:var(--muted);text-align:center;margin:0;line-height:1.55;font-weight:500;text-transform:uppercase;letter-spacing:.04em}
.sidebar-affil{font-size:.8rem;color:var(--muted);text-align:center;margin:0;line-height:1.5}
.sidebar-interests-label{font-size:.7rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin:0 0 4px;text-align:center}.sidebar-interests{display:flex;flex-wrap:wrap;justify-content:center;gap:5px;margin:0;padding:0}
.sidebar-interests span{font-size:.7rem;color:var(--accent);background:rgba(47,93,124,.08);border:1px solid rgba(47,93,124,.18);border-radius:20px;padding:2px 9px;white-space:nowrap;line-height:1.6}
.sidebar-icons{display:flex;justify-content:center;gap:16px;flex-wrap:wrap}
.sidebar-icons a{color:var(--muted);font-size:1.05rem;display:flex;align-items:center;line-height:1;transition:color .15s}
.sidebar-icons a:hover{text-decoration:none;filter:brightness(.82)}
.sidebar-icons a[title="Google Scholar"]{color:#4285F4}
.sidebar-icons a[title="ORCID"]{color:#A6CE39}
.sidebar-icons a[title="ResearchGate"]{color:#00CCBB}
.sidebar-icons a[title="LinkedIn"]{color:#0A66C2}
.sidebar-icons a[title="GitHub"]{color:#181717}
.sidebar-divider{width:100%;height:1px;background:var(--line)}
.sidebar-nav{display:flex;flex-direction:column;gap:2px;width:100%}
.sidebar-nav a{color:var(--muted);font-size:.9rem;font-weight:500;padding:8px 14px;border-radius:6px;display:flex;align-items:center;gap:8px}
.sidebar-nav a i{width:14px;text-align:center;font-size:.82rem;opacity:.7}
.sidebar-nav a:hover{color:var(--ink);background:var(--light);text-decoration:none}
.sidebar-nav a.active{color:var(--ink);background:var(--light);font-weight:600}

/* ── Main body ── */
.site-body{display:flex;flex-direction:column;min-height:100vh;overflow:hidden}
.site-body main{flex:1}
.container{width:min(calc(100% - 48px),var(--container));margin:0 auto}

/* ── Typography ── */
h1,h2,h3{font-family:Georgia,"Times New Roman",serif;line-height:1.25;margin-top:0;color:var(--ink)}
h1{font-size:clamp(1.9rem,3.5vw,2.8rem);font-weight:500;margin-bottom:16px}
h2{font-size:1.7rem;margin-bottom:8px}
h3{font-size:1.1rem;margin-bottom:6px}
p{margin:0 0 14px}
p:last-child{margin-bottom:0}

/* ── Intro section (homepage) ── */
.intro-section{padding:56px 0 44px;border-bottom:1px solid var(--line)}
.intro-section .lede{font-size:1.12rem;color:var(--muted);max-width:640px;margin:0 0 24px}

/* ── Page hero (inner pages) ── */
.page-hero{padding:52px 0 40px;border-bottom:1px solid var(--line)}
.page-intro{max-width:680px}
.eyebrow{display:block;margin:0 0 12px;color:var(--muted);font-size:.78rem;text-transform:uppercase;letter-spacing:.12em;font-weight:700}
.lede{font-size:1.05rem;color:var(--muted);max-width:680px;margin:0 0 22px}
.breadcrumb{display:inline-block;margin-bottom:10px;color:var(--muted);font-size:.9rem}

/* ── Buttons ── */
.button-row{display:flex;gap:10px;flex-wrap:wrap}
.button{display:inline-flex;align-items:center;justify-content:center;min-height:38px;padding:0 16px;border:1px solid var(--line);border-radius:6px;background:var(--surface);color:var(--ink);font-size:.88rem;font-weight:500}
.button:hover{text-decoration:none;border-color:#bbb}
.button.primary{background:var(--ink);border-color:var(--ink);color:#fff}
.button.primary:hover{background:#333}
.button.light,.button.soft{background:var(--surface);color:var(--ink);border-color:var(--line)}

/* ── Sections ── */
.section{padding:52px 0}
.section.alt{background:var(--surface-alt);border-top:1px solid var(--line)}
.section.dark{background:var(--surface-alt);border-top:1px solid var(--line);color:var(--ink)}
.section.dark p{color:var(--muted)}
.section-head{margin-bottom:28px}
.section-head h2{font-size:1.6rem;margin-bottom:6px}
.section-head p{margin:0;color:var(--muted);font-size:.95rem}

/* ── Two / Three column ── */
.two-col{display:grid;grid-template-columns:1.4fr .85fr;gap:40px;align-items:start}
.three-col{display:grid;grid-template-columns:repeat(3,1fr);gap:0}
.news-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}

/* ── Cards ── */
.card{padding:20px 0;border-top:1px solid var(--line)}
.card:first-child{border-top:0;padding-top:0}
.card h3{font-size:1rem;margin-bottom:6px}
.card p{color:var(--muted);margin:0;font-size:.93rem}
.news-card{padding:0}
.news-card h3{font-size:1rem;margin-bottom:6px}
.news-card p{color:var(--muted);margin:0;font-size:.93rem}
.news-date{display:block;margin-bottom:5px;color:var(--accent);font-size:.75rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em}

/* ── Fact card ── */
.fact-card{background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:22px}
.fact-list{list-style:none;margin:0;padding:0}
.fact-list li{padding:9px 0;border-bottom:1px solid var(--line)}
.fact-list li:last-child{border-bottom:0;padding-bottom:0}
.fact-list li:first-child{padding-top:0}
.fact-list strong{display:block;font-size:.8rem;text-transform:uppercase;letter-spacing:.04em;color:var(--muted);margin-bottom:2px;font-weight:600}
.fact-list span{display:block;color:var(--ink);font-size:.9rem}

/* ── Publications ── */
.pub-total{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;font-size:.88rem;font-weight:400;color:var(--muted)}
.pub-total a{color:var(--accent);font-weight:500}
.badges,.badge{display:none}
.pub-grid{display:grid;gap:0}
.pub-card{padding:16px 0;border-top:1px solid var(--line);display:block}
.pub-card h3{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;font-size:.93rem;font-weight:500;line-height:1.65;margin:0 0 4px}
.pub-card p{margin:0;color:var(--muted);font-size:.88rem}
.pub-section+.pub-section{margin-top:36px}
.pub-section h2{font-size:1.35rem;margin-bottom:12px}

/* ── Education cards ── */
.edu-list{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.edu-card{display:flex;flex-direction:column;gap:12px;padding:20px;border:1px solid var(--line);border-radius:10px;min-width:0}
.edu-card:first-child{border-top:1px solid var(--line);padding-top:20px}
.edu-card--tamu{background:rgba(80,0,0,.05);border-color:rgba(80,0,0,.18)}
.edu-card--tamu .edu-inst{color:#500000}
.edu-card--nus{background:rgba(29,66,124,.05);border-color:rgba(29,66,124,.18)}
.edu-card--nus .edu-inst{color:#1D427C}
.edu-card--ccnu{background:rgba(0,117,129,.05);border-color:rgba(0,117,129,.18)}
.edu-card--ccnu .edu-inst{color:#007581}
.edu-logo{width:56px;height:56px;object-fit:contain;flex-shrink:0}
.edu-top{display:flex;gap:12px;align-items:center}
.edu-top-text{flex:1}
.award-scroll{display:flex;gap:6px;overflow-x:auto;padding:4px 0 2px;scrollbar-width:thin;margin-top:4px}
.award-scroll span{white-space:nowrap;font-size:.76rem;padding:2px 9px;border:1px solid var(--line);border-radius:20px;color:var(--muted);flex-shrink:0}
.edu-header{display:flex;flex-direction:column;gap:2px;margin-bottom:4px}
.edu-degree{font-size:.98rem;font-weight:700;margin:0;color:var(--ink)}
.edu-date{font-size:.82rem;color:var(--muted);white-space:nowrap;flex-shrink:0}
.edu-inst{font-size:.88rem;color:var(--ink);margin:0 0 10px;font-weight:700}.edu-city{color:var(--muted)}.edu-tag{display:inline;background:rgba(47,93,124,.1);border:1px solid rgba(47,93,124,.2);border-radius:4px;padding:1px 7px;color:var(--accent);white-space:nowrap}
.edu-meta{display:grid;grid-template-columns:auto 1fr;gap:4px 16px;margin:0}
.edu-meta dt{color:var(--muted);font-size:.78rem;font-weight:700;text-transform:uppercase;letter-spacing:.05em;white-space:nowrap;padding-top:1px}
.edu-meta dd{margin:0;font-size:.88rem;color:var(--ink)}
.edu-award-list{margin:0;padding-left:14px;display:grid;gap:1px}
.edu-award-list li{font-size:.88rem;color:var(--ink)}
.edu-award-list a{color:var(--accent)}

/* ── Teaching evaluations ── */
.eval-box{margin-top:24px;background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:16px 18px}
.eval-title{font-size:.78rem;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--ink);margin:0 0 10px}
.eval-source{font-weight:400;color:var(--muted);text-transform:none;letter-spacing:0;margin-left:6px}
.eval-scores{list-style:none;margin:0 0 12px;padding:0;display:flex;flex-wrap:wrap;gap:6px 24px}
.eval-scores li{font-size:.8rem;color:var(--muted);display:flex;align-items:center;gap:6px}
.eval-scores li strong{color:var(--accent);font-weight:600}
.quote-carousel{position:relative;min-height:60px}
.eval-quote{margin:8px 0 0;padding:10px 14px;border-left:3px solid var(--accent);background:rgba(47,93,124,.04);font-size:.82rem;color:var(--muted);font-style:italic;line-height:1.6;opacity:0;position:absolute;width:100%;top:0;left:0;transition:opacity .5s ease;pointer-events:none}
.eval-quote.active{opacity:1;position:relative;pointer-events:auto}
.quote-dots{display:flex;gap:5px;margin-top:10px;justify-content:flex-start}
.quote-dot{width:6px;height:6px;border-radius:50%;background:var(--line);cursor:pointer;transition:background .2s;border:none;padding:0}
.quote-dot.active{background:var(--accent)}

/* ── Appointments two-col ── */
.appt-cols{display:grid;grid-template-columns:1.3fr 1.6fr;gap:48px;align-items:start}
.appt-col-head{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;font-size:.78rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin:0 0 12px}

/* ── Timeline ── */
.timeline{display:grid;gap:0}
.timeline-item{padding:14px 0;border-top:1px solid var(--line);display:grid;grid-template-columns:130px 1fr;gap:18px}
.timeline-item .date{color:var(--muted);font-size:.84rem;font-weight:600;padding-top:2px}
.timeline-item h3{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;font-size:.93rem;font-weight:600;margin:0 0 2px}
.timeline-item p{margin:0;color:var(--muted);font-size:.88rem}

/* ── Quote ── */
.quote{background:var(--surface);border:1px solid var(--line);border-radius:8px;padding:22px}
.quote h3{color:var(--ink);font-size:1rem;margin-bottom:8px}
.quote p{color:var(--muted);margin:0;font-size:.93rem}

/* ── Contact ── */
.contact-card{display:grid;grid-template-columns:1fr 1fr;gap:30px;padding-top:0}
.contact-list{list-style:none;margin:0;padding:0}
.contact-list li{padding:9px 0;border-bottom:1px solid var(--line)}
.contact-list li:last-child{border-bottom:0}
.contact-list a{font-weight:500;color:var(--ink)}
.contact-list a:hover{color:var(--accent)}

/* ── Research page ── */
.research-block{display:grid;grid-template-columns:110px 1fr;gap:24px;padding:28px 0;border-top:1px solid var(--line)}
.research-index{color:var(--muted);font-size:.75rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;padding-top:4px}
.research-block h3{font-size:1.25rem;margin-bottom:8px}
.research-block p{margin:0 0 10px;color:var(--muted);font-size:.93rem}
.research-block ul{padding-left:18px;margin:0}
.research-block li{margin-bottom:6px;font-size:.9rem;color:var(--muted)}
.plain-list{list-style:none;margin:0;padding:0}

/* ── CV ── */
.cv-grid{display:grid;grid-template-columns:1.25fr .75fr;gap:40px;align-items:start}
.cv-main,.cv-side{display:grid;gap:32px;align-content:start}
.cv-card h2{font-size:1.35rem;margin-bottom:12px}
.cv-item{padding:13px 0;border-top:1px solid var(--line)}
.cv-meta{display:flex;justify-content:space-between;gap:12px;color:var(--muted);font-size:.84rem;margin-bottom:3px}
.cv-item h3{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;font-size:.93rem;font-weight:600;margin:0 0 3px}
.cv-item p{margin:0;color:var(--muted);font-size:.88rem}
.list{margin:0;padding-left:18px}
.list li{margin-bottom:7px;font-size:.9rem;color:var(--muted)}
.skills{display:flex;flex-wrap:wrap;gap:7px;list-style:none;margin:0;padding:0}
.skills li{display:inline-flex;padding:4px 10px;border:1px solid var(--line);border-radius:5px;color:var(--muted);font-size:.84rem}
.download{background:var(--light);border-radius:8px;padding:20px}

/* ── About + News grid ── */
.about-grid{display:grid;grid-template-columns:1fr 300px;gap:40px;align-items:stretch}
.about-news-card{border:1px solid var(--line);border-radius:8px;overflow:hidden;box-shadow:0 2px 10px rgba(0,0,0,.05);display:flex;flex-direction:column;max-height:340px}
.about-news-head{padding:11px 16px;background:var(--surface-alt);border-bottom:1px solid var(--line);display:flex;align-items:baseline;justify-content:space-between;gap:8px}
.about-news-title{margin:0;font-size:.9rem;font-weight:700;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;color:var(--ink);display:flex;align-items:center;gap:6px}
.about-news-title i{color:var(--accent);font-size:.82rem}
.about-news-updated{font-size:.7rem;color:var(--muted);white-space:nowrap}

/* ── Latest News list ── */
.news-list{list-style:none;margin:0;padding:0 16px;flex:1;min-height:0;overflow-y:auto;scrollbar-width:thin;scrollbar-color:var(--line) transparent}
.news-item{padding:13px 0;border-bottom:1px solid var(--line);display:flex;flex-direction:column;gap:4px}
.news-item:last-child{border-bottom:0;padding-bottom:14px}
.news-date{font-size:.7rem;font-weight:700;color:var(--accent);text-transform:uppercase;letter-spacing:.06em}
.news-body{font-size:.86rem;line-height:1.65;color:var(--ink)}
.news-body em{font-style:italic;color:var(--muted)}
.news-body a{font-weight:700}
.news-body strong{color:var(--accent)}

/* ── Section headings ── */
.section-h{font-size:1.55rem;margin-bottom:24px;padding-bottom:10px;border-bottom:2px solid var(--line)}
.first-section{padding-top:52px}
.section-alt{background:var(--surface-alt)}

/* ── Publications (homepage) ── */
.pub-cat{font-size:.78rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);font-weight:700;margin:28px 0 12px;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif}
.pub-cat:first-child{margin-top:0}
.pub-card h4{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;font-size:.93rem;font-weight:500;line-height:1.65;margin:0 0 4px;color:var(--ink)}
.pub-card{padding:20px 0;border-top:1px solid var(--line);display:grid;grid-template-columns:240px 1fr;gap:22px;align-items:start}
.pub-fig{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:6px;background:var(--light);display:block}
.pub-body{display:flex;flex-direction:column;gap:0}
.pub-abstract{font-size:.84rem;color:var(--muted);line-height:1.65;margin:6px 0 12px}
/* pub figure carousel */
.pub-carousel{position:relative;border-radius:6px;overflow:hidden;background:var(--light);box-shadow:0 6px 22px rgba(0,0,0,.13)}
.pub-fig{border-radius:6px;box-shadow:0 6px 22px rgba(0,0,0,.13);display:block;width:100%}
.pub-carousel-track{display:flex;transition:transform .35s ease;will-change:transform}
.pub-carousel-track img{width:100%;flex-shrink:0;height:300px;object-fit:contain;background:#f7f8fa;display:block;padding:10px 14px}
.pub-carousel-btn{position:absolute;top:50%;transform:translateY(-50%);background:rgba(255,255,255,.92);border:none;border-radius:50%;width:24px;height:24px;cursor:pointer;font-size:1rem;display:flex;align-items:center;justify-content:center;color:var(--ink);padding:0;box-shadow:0 1px 4px rgba(0,0,0,.15);line-height:1}
.pub-carousel-prev{left:4px}.pub-carousel-next{right:4px}
.pub-carousel-dots-wrap{display:flex;justify-content:center;gap:4px;padding:5px 0;background:var(--surface-alt)}
.pub-carousel-dot{width:5px;height:5px;border-radius:50%;background:var(--line);border:none;padding:0;cursor:pointer;transition:background .2s}
.pub-carousel-dot.active{background:var(--accent)}
.pub-links{display:flex;gap:7px;flex-wrap:wrap;margin-top:auto}
.pub-link{font-size:.77rem;padding:3px 11px;border-radius:20px;border:1px solid var(--accent);color:var(--accent);text-decoration:none;transition:background .15s,color .15s;white-space:nowrap}
.pub-link:hover{background:var(--accent);color:#fff}

/* ── Projects ── */
.project-list{display:grid;gap:0}
.project-block{display:grid;grid-template-columns:52px 1fr;gap:20px;padding:24px 0;border-top:1px solid var(--line)}
.project-num{font-family:Georgia,serif;font-size:1.4rem;font-weight:500;color:var(--line);padding-top:2px}
.project-block h3{font-size:1.05rem;margin-bottom:8px}
.project-block p{color:var(--muted);font-size:.93rem;margin:0 0 6px}
.project-papers{font-size:.8rem !important;color:#aaa !important}

/* ── Awards ── */
.award-list{display:grid;gap:0}
.award-item{display:grid;grid-template-columns:64px 1fr;gap:16px;padding:14px 0;border-top:1px solid var(--line);align-items:start}
.award-year{font-size:.8rem;font-weight:700;color:var(--muted);padding-top:2px}
.award-title{font-size:.95rem;margin:0 0 2px;color:var(--ink);font-weight:500}
.award-amt{font-size:.82rem;color:var(--accent);margin-left:6px;font-weight:600}
.award-org{font-size:.82rem;color:var(--muted);margin:0}

/* ── Service ── */
.service-grid{align-items:stretch}
.service-panel{display:flex;flex-direction:column;min-height:0}
.review-list{list-style:none;margin:0;padding:0}
.review-list li{padding:8px 0;border-bottom:1px solid var(--line);font-size:.93rem;color:var(--muted)}
.review-list li:last-child{border-bottom:0}
.review-scroll{max-height:176px;overflow-y:auto;padding-right:10px;scrollbar-width:thin;scrollbar-color:var(--line) transparent}
.service-panel .review-scroll{flex:1;max-height:none;min-height:0}
.review-scroll::-webkit-scrollbar{width:6px}
.review-scroll::-webkit-scrollbar-thumb{background:var(--line);border-radius:999px}

/* ── Footprint ── */
#footprint-map{height:380px;border-radius:10px;margin-bottom:10px;border:1px solid var(--line);overflow:hidden}
.map-legend{font-size:.78rem;color:var(--muted);margin:0 0 28px;display:flex;align-items:center;gap:6px}
.map-dot{display:inline-block;border:2px solid #fff;box-shadow:0 1px 3px rgba(0,0,0,.3);flex-shrink:0}
.map-dot.inst{width:12px;height:12px;border-radius:50%;background:#2f5d7c}
.map-dot.conf{width:10px;height:10px;border-radius:2px;background:#e07b39;margin-left:10px}
.footprint-grid{display:grid;grid-template-columns:1fr 1fr;gap:40px}
.footprint-cat{font-size:.78rem;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);font-weight:700;margin-bottom:16px;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif}
.footprint-list{list-style:none;margin:0;padding:0}
.footprint-list li{display:flex;gap:12px;align-items:flex-start;padding:10px 0;border-bottom:1px solid var(--line)}
.footprint-list li:last-child{border-bottom:0}
.fp-flag{font-size:1.2rem;flex-shrink:0;line-height:1.4}
.footprint-list strong{display:block;font-size:.93rem;color:var(--ink);margin-bottom:2px}
.footprint-list span{display:block;font-size:.8rem;color:var(--muted)}

/* ── Contact grid ── */
.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}
.contact-item{display:flex;align-items:center;gap:10px;padding:14px 16px;border:1px solid var(--line);border-radius:8px;color:var(--ink);font-size:.9rem;font-weight:500;transition:border-color .15s,background .15s}
.contact-item:hover{border-color:#bbb;background:var(--light);text-decoration:none}
.contact-item i{font-size:1.05rem;color:var(--muted);width:18px;text-align:center;flex-shrink:0}

/* ── Back to top + Dark toggle ── */
.back-to-top{position:fixed;bottom:24px;right:24px;z-index:300;width:44px;height:44px;border-radius:50%;background:var(--accent);color:#fff;border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:.9rem;box-shadow:0 2px 10px rgba(0,0,0,.2);opacity:0;visibility:hidden;transition:opacity .25s,visibility .25s,transform .25s;transform:translateY(8px);padding:0}
.back-to-top.visible{opacity:1;visibility:visible;transform:translateY(0)}
.back-to-top:hover{background:#1e3f56}
.progress-ring{position:absolute;inset:0;width:100%;height:100%;transform:rotate(-90deg);pointer-events:none;overflow:visible}
.progress-ring-fill{fill:none;stroke:rgba(255,255,255,.6);stroke-width:3;stroke-linecap:round;transition:stroke-dashoffset .15s linear}
.dark-toggle{position:fixed;bottom:76px;right:24px;z-index:300;width:40px;height:40px;border-radius:50%;background:var(--surface);color:var(--muted);border:1px solid var(--line);cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:.9rem;box-shadow:0 2px 10px rgba(0,0,0,.15);transition:background .2s,color .2s,border-color .2s}
.dark-toggle:hover{color:var(--ink);background:var(--light)}

/* ── Footer ── */
.site-footer{border-top:1px solid var(--line);padding:22px 0;color:var(--muted);background:var(--surface);font-size:.84rem;margin-top:auto}
.footer-wrap{display:flex;justify-content:space-between;gap:16px;align-items:center;flex-wrap:wrap}
.footer-links{display:flex;gap:14px;flex-wrap:wrap}
.footer-links a{color:var(--muted)}
.footer-links a:hover{color:var(--ink)}

/* ── Mobile nav bar ── */
.mnav{display:none}

/* ── Mobile ── */
@media(max-width:860px){
  body{grid-template-columns:1fr}
  .sidebar{position:static;height:auto;border-right:0;border-bottom:1px solid var(--line)}
  .sidebar-inner{flex-direction:column;padding:28px 20px;gap:14px}
  .portrait{width:120px;height:120px}
  .sidebar-nav{display:none}
  .sidebar-divider{display:none}
  .site-body{min-height:auto}
  .mnav{display:block;position:sticky;top:0;z-index:200;background:var(--surface);border-bottom:1px solid var(--line);box-shadow:0 2px 8px rgba(0,0,0,.07)}
  .mnav-bar{display:flex;align-items:center;justify-content:space-between;padding:0 16px;height:50px}
  .mnav-brand{font-family:Georgia,"Times New Roman",serif;font-size:1rem;font-weight:500;color:var(--ink)}
  .mnav-brand:hover{text-decoration:none}
  .mnav-toggle{background:none;border:none;cursor:pointer;color:var(--muted);font-size:1.2rem;padding:8px;margin-right:-8px;line-height:1;display:flex;align-items:center;transition:color .15s}
  .mnav-toggle:hover{color:var(--ink)}
  .mnav-links{display:none;border-top:1px solid var(--line);padding:8px 12px 14px;grid-template-columns:repeat(auto-fill,minmax(130px,1fr));gap:2px}
  .mnav-links.open{display:grid}
  .mnav-links a{color:var(--muted);font-size:.88rem;font-weight:500;padding:9px 10px;border-radius:6px;display:flex;align-items:center;gap:8px}
  .mnav-links a i{width:14px;text-align:center;font-size:.8rem;opacity:.7;flex-shrink:0}
  .mnav-links a:hover{color:var(--ink);background:var(--light);text-decoration:none}
  .mnav-links a.active{color:var(--ink);background:var(--light);font-weight:600}
  .two-col,.cv-grid,.contact-card,.research-block,.timeline-item,.footprint-grid,.edu-card,.appt-cols,.pub-card{grid-template-columns:1fr}
  .about-grid{grid-template-columns:1fr}
  .edu-list{grid-template-columns:1fr}
  .edu-logo{width:44px;height:44px}
  .three-col,.news-grid,.contact-grid{grid-template-columns:1fr}
  .project-block{grid-template-columns:40px 1fr}
  .award-item{grid-template-columns:48px 1fr}
  .footer-wrap{flex-direction:column;align-items:flex-start;gap:10px}
  .container{width:min(calc(100% - 32px),var(--container))}
}