:root{
  --paper:#f8f7f2;
  --panel:#ffffff;
  --ink:#171a21;
  --muted:#5b5f68;
  --line:#e3e0d2;
  --accent:#0e8f73;
  --accent-dark:#0b6f5a;
  --accent-tint:#e1f5ee;
  --gold:#c08a2e;
  --gold-tint:#fbf1de;
  --font-display:'Oldenburg', cursive;
  --font-body:'Plus Jakarta Sans', sans-serif;
  --font-mono:'JetBrains Mono', monospace;
  --font-signature:'Alex Brush', cursive;
  --side-w:248px;
}

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

.skip-link{
  position:absolute;
  top:-48px;
  left:12px;
  background:var(--ink);
  color:#fff;
  padding:10px 16px;
  border-radius:0 0 6px 6px;
  font-size:14px;
  z-index:100;
  transition:top .15s ease;
}

.skip-link:focus{top:0;}

#admin-top-btn{
  position:fixed;
  top:16px;
  right:16px;
  z-index:45;
  font-family:var(--font-body);
  font-size:12.5px;
  font-weight:500;
  padding:8px 16px;
  border-radius:20px;
  border:1px solid var(--line);
  background:var(--panel);
  color:var(--muted);
  text-decoration:none;
  box-shadow:0 2px 10px rgba(0,0,0,0.06);
  transition:border-color .15s ease, color .15s ease, background .15s ease;
}

#admin-top-btn:hover{
  border-color:var(--accent);
  color:var(--accent-dark);
  background:var(--accent-tint);
}

@media (max-width:920px){
  #admin-top-btn{top:auto;bottom:16px;left:16px;right:auto;}
}

body{
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}

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

::selection{background:var(--accent-tint);color:var(--accent-dark);}

a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible{
  outline:2px solid var(--accent);
  outline-offset:2px;
}

/* ---------- Layout shell ---------- */

.shell{
  display:flex;
  align-items:flex-start;
  max-width:1160px;
  margin:0 auto;
}

.sidebar{
  position:sticky;
  top:0;
  height:100vh;
  width:var(--side-w);
  flex-shrink:0;
  padding:48px 28px;
  display:flex;
  flex-direction:column;
  justify-content:space-between;
  border-right:1px solid var(--line);
}

.sidebar .mark{
  font-family:var(--font-signature);
  font-weight:400;
  font-size:30px;
  color:var(--accent-dark);
  text-decoration:none;
  display:inline-block;
  cursor:pointer;
  transition:opacity .15s ease;
}

.sidebar .mark:hover{opacity:0.75;}

.toc{
  margin-top:56px;
  display:flex;
  flex-direction:column;
  gap:2px;
}

.toc a{
  display:flex;
  gap:14px;
  align-items:baseline;
  padding:9px 0;
  font-size:14px;
  color:var(--muted);
  border-left:2px solid transparent;
  padding-left:14px;
  margin-left:-14px;
  border-radius:0 4px 4px 0;
  transition:color .15s ease, border-color .15s ease, background .15s ease;
}

.toc a .idx{
  font-family:var(--font-mono);
  font-size:11px;
  color:var(--muted);
  width:18px;
  flex-shrink:0;
}

.toc a:hover{color:var(--ink);background:var(--accent-tint);}

.toc a.active{
  color:var(--accent-dark);
  border-left-color:var(--accent);
  background:var(--accent-tint);
  font-weight:500;
}

.toc a.active .idx{color:var(--accent);}

.sidebar .sidebar-foot{
  font-size:12.5px;
  color:var(--muted);
}

.sidebar .sidebar-foot a{
  display:block;
  padding:5px 0;
  border-bottom:1px solid transparent;
}
.sidebar .sidebar-foot a:hover{color:var(--accent-dark);}

@media (max-width:920px){
  .sidebar{
    position:sticky;
    top:0;
    z-index:30;
    height:auto;
    width:100%;
    border-right:none;
    border-bottom:1px solid var(--line);
    background:var(--paper);
    padding:14px 16px;
  }
  .toc{
    margin-top:10px;
    flex-direction:row;
    flex-wrap:nowrap;
    overflow-x:auto;
    -webkit-overflow-scrolling:touch;
    gap:6px;
    scrollbar-width:none;
  }
  .toc::-webkit-scrollbar{display:none;}
  .toc a{
    padding:6px 12px;
    border-left:none;
    margin-left:0;
    border-radius:14px;
    border:1px solid var(--line);
    flex-shrink:0;
    white-space:nowrap;
  }
  .toc a.active{border-left:none;border-color:var(--accent);}
  .toc a .idx{display:none;}
  .sidebar-foot{display:none;}
  .shell{flex-direction:column;}
}

main{
  flex:1;
  min-width:0;
  padding:0 56px;
}

@media (max-width:920px){
  main{padding:0 24px;}
}

.col{
  max-width:720px;
}

section{
  padding:76px 0;
  border-bottom:1px solid var(--line);
  scroll-margin-top:24px;
}

section:last-of-type{border-bottom:none;}

.eyebrow{
  font-family:var(--font-mono);
  font-size:12px;
  color:var(--accent);
  margin-bottom:14px;
}

h2.h-title{
  font-family:var(--font-display);
  font-weight:400;
  font-size:32px;
  letter-spacing:0;
  margin-bottom:28px;
}

p{color:var(--ink);}
p.dim{color:var(--muted);}

.btn{
  font-family:var(--font-body);
  font-weight:500;
  font-size:14px;
  padding:12px 22px;
  border-radius:6px;
  border:1px solid var(--line);
  display:inline-block;
  cursor:pointer;
  background:var(--panel);
  color:var(--ink);
  transition:border-color .15s ease, background .15s ease, color .15s ease, transform .15s ease;
}

.btn:hover{border-color:var(--accent);color:var(--accent-dark);background:var(--accent-tint);}

.btn:disabled{
  opacity:0.5;
  cursor:not-allowed;
  pointer-events:none;
}

.btn-solid{
  background:var(--accent);
  border-color:var(--accent);
  color:#ffffff;
}
.btn-solid:hover{background:var(--accent-dark);border-color:var(--accent-dark);color:#ffffff;transform:translateY(-1px);}

/* ---------- Hero ---------- */

.hero{
  padding-top:64px;
  display:grid;
  grid-template-columns:1fr 168px;
  gap:40px;
  align-items:center;
}

@media (max-width:640px){
  .hero{grid-template-columns:1fr;}
  .hero .photo{order:-1;width:96px;height:96px;}
}

.hero .title{
  font-family:var(--font-mono);
  font-size:13px;
  color:var(--accent);
  margin-bottom:14px;
}

.hero h1{
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(38px, 5.5vw, 54px);
  line-height:1.05;
  letter-spacing:-0.02em;
}

#hero-name{
  font-family:var(--font-signature);
  font-weight:400;
  font-size:clamp(64px, 9vw, 94px);
  line-height:1;
  letter-spacing:0;
  color:var(--accent-dark);
}

.hero .lede{
  margin-top:18px;
  max-width:56ch;
  font-size:16.5px;
  color:var(--muted);
}

.hero .actions{
  margin-top:30px;
  display:flex;
  gap:12px;
  flex-wrap:wrap;
}

.photo{
  width:168px;
  height:168px;
  border-radius:10px;
  background:linear-gradient(160deg, var(--accent-tint), var(--gold-tint));
  border:1px solid var(--line);
  overflow:hidden;
}

.photo img{width:100%;height:100%;object-fit:cover;}

/* ---------- About ---------- */

.about-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:36px;
  margin-top:32px;
}

@media (max-width:640px){
  .about-grid{grid-template-columns:1fr;}
}

.about-grid h3{
  font-family:var(--font-display);
  font-size:18px;
  font-weight:400;
  margin-bottom:8px;
  color:var(--accent-dark);
}

.about-grid p{font-size:14.5px;color:var(--muted);}

/* ---------- Education / Experience timeline ---------- */

.timeline{
  position:relative;
  padding-left:28px;
  border-left:1px solid var(--line);
}

.t-item{
  position:relative;
  padding-bottom:36px;
}

.t-item:last-child{padding-bottom:0;}

.t-item::before{
  content:"";
  position:absolute;
  left:-33px;
  top:4px;
  width:9px;
  height:9px;
  border-radius:50%;
  background:var(--accent);
  box-shadow:0 0 0 3px var(--accent-tint);
}

.t-item .t-when{
  font-family:var(--font-mono);
  font-size:12px;
  color:var(--muted);
  margin-bottom:6px;
}

.t-item h3{
  font-family:var(--font-display);
  font-size:20px;
  font-weight:400;
}

.t-item .t-where{
  font-size:14px;
  color:var(--accent-dark);
  margin-top:2px;
}

.t-item p{
  margin-top:10px;
  font-size:14.5px;
  color:var(--muted);
  max-width:58ch;
}

.t-item ul{
  margin-top:10px;
  padding-left:18px;
  font-size:14.5px;
  color:var(--muted);
}

.t-item li{margin-bottom:4px;}

/* ---------- Research list ---------- */

.paper{
  padding:22px 0;
  border-bottom:1px solid var(--line);
}

.paper:last-child{border-bottom:none;}

.paper .p-year{
  font-family:var(--font-mono);
  font-size:12px;
  color:var(--muted);
  margin-bottom:6px;
}

.paper h3{
  font-family:var(--font-display);
  font-size:19px;
  font-weight:400;
  margin-bottom:6px;
}

.paper .p-venue{
  font-size:13.5px;
  color:var(--accent-dark);
  margin-bottom:8px;
}

.paper p{font-size:14.5px;color:var(--muted);max-width:60ch;}

.paper .p-link{
  display:inline-block;
  margin-top:10px;
  font-size:13.5px;
  font-family:var(--font-mono);
  color:var(--ink);
  border-bottom:1px solid var(--line);
}
.paper .p-link:hover{border-color:var(--accent);color:var(--accent-dark);}

.status-tag{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:11px;
  padding:3px 8px;
  border-radius:4px;
  background:var(--accent-tint);
  color:var(--accent-dark);
  margin-left:8px;
}

/* ---------- Projects ---------- */

.project{
  padding:24px 0;
  border-bottom:1px solid var(--line);
  display:grid;
  grid-template-columns:1fr;
  gap:10px;
}
.project:last-child{border-bottom:none;}

.project .p-top{
  display:flex;
  justify-content:space-between;
  align-items:baseline;
  gap:16px;
  flex-wrap:wrap;
}

.project h3{
  font-family:var(--font-display);
  font-size:19px;
  font-weight:400;
}

.project .p-cat{
  font-family:var(--font-mono);
  font-size:11.5px;
  color:var(--muted);
}

.project p.desc{font-size:14.5px;color:var(--muted);max-width:62ch;}

.tag-row{
  display:flex;
  flex-wrap:wrap;
  gap:7px;
  margin-top:4px;
}

.tag{
  font-family:var(--font-mono);
  font-size:11.5px;
  padding:4px 9px;
  border:1px solid var(--line);
  border-radius:5px;
  background:var(--accent-tint);
  color:var(--accent-dark);
}

.project .p-links{
  display:flex;
  gap:16px;
  margin-top:4px;
  font-size:13.5px;
}

.project .p-links a{
  border-bottom:1px solid var(--line);
}
.project .p-links a:hover{border-color:var(--accent);color:var(--accent-dark);}

/* ---------- Skills ---------- */

.skill-block{margin-bottom:30px;}
.skill-block:last-child{margin-bottom:0;}

.skill-block h3{
  font-family:var(--font-display);
  font-size:17px;
  font-weight:400;
  margin-bottom:12px;
  color:var(--muted);
}

.skill-tags{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
}

/* ---------- Certifications ---------- */

.cert-row{
  display:grid;
  grid-template-columns:1fr auto;
  gap:16px;
  padding:16px 0;
  border-bottom:1px solid var(--line);
  align-items:baseline;
}
.cert-row:last-child{border-bottom:none;}

.cert-row h3{
  font-family:var(--font-display);
  font-size:17px;
  font-weight:400;
}

.cert-row .c-issuer{
  font-size:13.5px;
  color:var(--muted);
  margin-top:2px;
}

.cert-row .c-year{
  font-family:var(--font-mono);
  font-size:12.5px;
  color:var(--muted);
  white-space:nowrap;
}

.cert-row.award .c-year{
  color:var(--gold);
  background:var(--gold-tint);
  padding:3px 8px;
  border-radius:4px;
}

/* ---------- CV ---------- */

.cv-box{
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:24px;
  padding:28px;
  border:1px solid var(--line);
  border-radius:10px;
  background:linear-gradient(160deg, var(--panel), var(--accent-tint));
  flex-wrap:wrap;
}

.cv-box h3{
  font-family:var(--font-display);
  font-size:19px;
  font-weight:400;
  margin-bottom:6px;
}

.cv-box p{font-size:14px;color:var(--muted);max-width:44ch;}

/* ---------- Contact ---------- */

.contact-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:48px;
}

@media (max-width:700px){
  .contact-grid{grid-template-columns:1fr;}
}

.contact-list a{
  display:flex;
  justify-content:space-between;
  padding:14px 0;
  border-bottom:1px solid var(--line);
  font-size:14.5px;
  border-radius:4px;
  transition:background .15s ease, padding-left .15s ease;
}

.contact-list a .c-k{color:var(--muted);}
.contact-list a:hover{background:var(--accent-tint);padding-left:8px;}
.contact-list a:hover .c-k{color:var(--accent-dark);}

form.contact-form{
  display:flex;
  flex-direction:column;
  gap:14px;
}

.contact-form label{
  font-size:12.5px;
  color:var(--muted);
  margin-bottom:6px;
  display:block;
}

.contact-form input,
.contact-form textarea{
  width:100%;
  font-family:var(--font-body);
  font-size:14px;
  padding:11px 12px;
  border:1px solid var(--line);
  border-radius:6px;
  background:var(--panel);
  color:var(--ink);
  transition:border-color .15s ease;
}

.contact-form input:focus,
.contact-form textarea:focus{border-color:var(--accent);}

.contact-form textarea{resize:vertical;min-height:96px;}

footer{
  background:var(--accent-dark);
  color:rgba(248,247,242,0.82);
  padding:56px 0 32px;
  margin-top:80px;
}

.footer-inner{
  max-width:1160px;
  margin:0 auto;
  padding:0 56px;
  text-align:center;
}

.footer-note{
  font-family:var(--font-display);
  font-weight:400;
  font-size:22px;
  color:var(--paper);
  max-width:56ch;
  margin:0 auto 36px;
}

.footer-meta{
  font-size:12.5px;
  color:rgba(248,247,242,0.68);
  display:flex;
  justify-content:center;
  align-items:center;
  flex-wrap:wrap;
  gap:8px 16px;
  padding-top:24px;
  border-top:1px solid rgba(248,247,242,0.18);
}

.footer-credit .divider{
  margin:0 8px;
  color:rgba(248,247,242,0.35);
}

footer a{
  font-family:var(--font-body);
  font-size:12.5px;
  font-weight:500;
  color:rgba(248,247,242,0.68);
  border-bottom:1px solid transparent;
  transition:color .15s ease, border-color .15s ease;
}

footer a:hover{
  color:var(--gold-tint);
  border-bottom-color:var(--gold-tint);
}

@media (max-width:920px){
  footer{margin-top:56px;padding:40px 0 28px;}
  .footer-inner{padding:0 24px;}
  .footer-note{font-size:19px;}
}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
}

html{scroll-behavior:smooth;}

/* ---------- Back to top (mobile) ---------- */

#back-to-top{
  position:fixed;
  bottom:20px;
  right:20px;
  width:44px;
  height:44px;
  border-radius:50%;
  border:1px solid var(--line);
  background:var(--panel);
  color:var(--ink);
  font-size:18px;
  cursor:pointer;
  box-shadow:0 4px 14px rgba(0,0,0,0.12);
  opacity:0;
  transform:translateY(8px);
  pointer-events:none;
  transition:opacity .2s ease, transform .2s ease, border-color .15s ease;
  z-index:40;
}

#back-to-top:hover{border-color:var(--accent);color:var(--accent-dark);}

#back-to-top.visible{
  opacity:1;
  transform:translateY(0);
  pointer-events:auto;
}

/* ---------- Contact form note ---------- */

.form-note{
  font-size:12px;
  color:var(--muted);
  margin-top:4px;
}

/* ---------- Print styles ---------- */

@media print{
  .sidebar, #back-to-top, #admin-top-btn, .skip-link, .contact-form{display:none !important;}
  .shell{display:block;}
  main{padding:0;}
  section{padding:16px 0;border-bottom:none;page-break-inside:avoid;}
  body{background:#fff;color:#000;}
  footer{background:none;color:#000;margin:24px 0 0;padding:16px 0 0;border-top:1px solid #ccc;}
  .footer-note{color:#000;}
  .footer-meta{color:#555;border-top:none;}
}