:root{
  --bg:#fff;
  --text:#111;
  --muted:#64748b;
  --primary:#1e3a8a;
  --border:#dde3ec;
  --card:#f4f7fb;
  --link:#2563eb;
  --shadow: 0 6px 20px rgba(0,0,0,.07);
  --radius:16px;
  --navy:#1a2e4a;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;}
[id]{scroll-margin-top:72px;}
body{
  margin:0;
  font-family: system-ui, sans-serif;
  line-height:1.6;
  color:var(--text);
  background:var(--bg);
}
a{color:var(--link); text-decoration:none}
a:hover{text-decoration:underline}
h1,h2{color:var(--navy);}
.container{max-width:980px; margin:0 auto; padding:24px}

/* Header — dark navy */
.site-header{
  position:sticky; top:0; z-index:50;
  background:var(--navy);
}
.nav{display:flex; align-items:center; justify-content:space-between;}
.brand{display:flex; align-items:center; gap:12px; font-weight:700; color:#e2e8f0;}
.brand:hover{text-decoration:none;}
.brand-avatar{width:36px; height:36px;}
.brand-avatar img{width:36px; height:36px; object-fit:cover; object-position:top center; border-radius:50%; display:block;}
.nav-links{display:flex; gap:8px;}
.nav-links a{padding:8px 14px; border-radius:8px; color:#cbd5e1; font-size:.95rem;}
.nav-links a:hover{background:rgba(255,255,255,.12); color:#fff; text-decoration:none;}

/* Hero */
.hero{
  display:grid; grid-template-columns: 170px 1fr; gap:28px; align-items:center;
  background:var(--card); border:1px solid var(--border);
  padding:28px; border-radius:var(--radius); box-shadow:var(--shadow);
}
.hero .photo{width:170px; height:170px;}
.hero .photo img{width:170px; height:170px; object-fit:cover; border-radius:10px; display:block;}
.hero-tagline{margin:2px 0 14px; color:var(--muted); font-size:.95rem; font-weight:500;}
.cta{margin-top:12px; display:flex; gap:12px;}
.button{padding:10px 14px; border:1px solid var(--border); border-radius:12px; background:#fff; cursor:pointer; font-size:1rem; color:var(--text); text-decoration:none; display:inline-block;}
.button.primary{background:var(--primary); color:#fff; border:none;}
.button:hover{text-decoration:none; filter:brightness(.96);}

.section{margin-top:28px}
.card{background:#fff; border:1px solid var(--border); border-radius:var(--radius); padding:22px; box-shadow:var(--shadow);}
.card h2:first-child{margin-top:0;}
.card hr{border:none; border-top:1px solid var(--border); margin:18px 0;}
.grid{display:grid; gap:16px}
@media(min-width:800px){ .grid.cols-2{grid-template-columns:1fr 1fr} }

/* Publications */
.pub-list{list-style:none; padding:0; display:grid; gap:14px}
.pub{padding:14px; border:1px solid var(--border); border-radius:12px; background:var(--card);}
.pub .title{font-weight:600; color:var(--navy);}
.pub .meta{color:var(--muted); font-size:.92rem; margin-top:2px;}
.badge{padding:2px 8px; font-size:.78rem; border-radius:999px; background:#dbeafe; border:1px solid #bfdbfe; color:#1e40af; margin-left:8px; font-weight:400;}
.pub-links{display:flex; gap:8px; flex-wrap:wrap; align-items:center; margin-top:8px;}

/* Pill buttons */
.btn-link{
  display:inline-block; padding:3px 11px;
  border:1px solid var(--border); border-radius:999px;
  background:#fff; font-size:.82rem; cursor:pointer;
  color:var(--link); text-decoration:none; line-height:1.6;
  transition: background .15s, border-color .15s;
}
.btn-link:hover{background:var(--card); text-decoration:none; border-color:#9db4d8;}
.btn-link.active{background:#dbeafe; border-color:#93c5fd;}

/* Abstract accordion */
.abstract-body{
  margin-top:10px; padding-top:10px;
  border-top:1px solid var(--border);
  font-size:.93rem; color:#444; line-height:1.75;
}
.abstract-body p{margin:0;}

footer{margin-top:48px; padding:24px 0; border-top:1px solid var(--border); color:var(--muted);}

/* Active nav highlight */
body[data-page="home"] a[data-nav="home"],
body[data-page="publications"] a[data-nav="publications"],
body[data-page="blog"] a[data-nav="blog"]{background:rgba(255,255,255,.18); color:#fff;}

/* Home page: hide brand, push nav right */
body[data-page="home"] .brand{display:none;}
body[data-page="home"] .nav-links{margin-left:auto;}

/* Two-column layout */
.page-layout{display:grid; grid-template-columns:290px 1fr; gap:28px; align-items:start;}
@media(max-width:720px){.page-layout{grid-template-columns:1fr;}}

.sidebar{
  margin-top:28px;
  background:#fff; border:1px solid var(--border);
  border-radius:var(--radius); padding:18px;
  box-shadow:var(--shadow); text-align:left;
}
.sidebar-avatar{width:60px; height:60px; margin:0 auto 8px;}
.sidebar-avatar img{width:60px; height:60px; object-fit:cover; border-radius:50%; display:block;}
.sidebar-name{font-weight:700; font-size:1.05rem; margin-bottom:2px; text-align:center;}
.sidebar-title{color:var(--muted); font-size:.85rem; margin-bottom:16px; text-align:center;}
.sidebar-links{list-style:none; padding:0; margin:0; display:flex; flex-direction:column; gap:4px;}
.sidebar-links > li > a{display:flex; align-items:center; gap:8px; padding:6px 10px; border-radius:8px; color:var(--text); font-size:.88rem;}
.sidebar-links > li > a:hover{background:var(--card); text-decoration:none;}

/* Email group — indented box */
.sidebar-email-group{padding:2px 0;}
.sidebar-link-label{display:flex; align-items:center; gap:8px; padding:4px 10px; font-size:.88rem; color:var(--text); font-weight:500;}
.sidebar-emails{list-style:none; padding:6px 12px; margin:4px 0 2px 8px; background:#eef1f6; border-radius:8px; display:flex; flex-direction:column; gap:2px;}
.sidebar-emails li a{display:block; font-size:.76rem; color:var(--link); line-height:1.7; white-space:nowrap;}
.sidebar-emails li a:hover{text-decoration:underline;}

.main-content{min-width:0;}