:root{
  --bg: #f4f9fb;
  --panel: rgba(0,0,0,0.03);
  --text: #0b1220;
  --muted: #516271;
  --accentA: #0ea5e9;
  --accentB: #10b981;
  --border: rgba(2,12,27,0.08);
  --shadow: 0 8px 24px rgba(2,12,27,0.06);
}

[data-theme="dark"]{
  --bg: #0b1220;
  --panel: rgba(255,255,255,0.06);
  --text: #e5f2f2;
  --muted: #a8c5c5;
  --accentA: #0ea5e9;
  --accentB: #10b981;
  --border: rgba(255,255,255,0.12);
  --shadow: 0 10px 30px rgba(0,0,0,0.25);
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Noto Sans, Helvetica Neue, Arial, "Apple Color Emoji","Segoe UI Emoji";
  background:
    radial-gradient(1200px 800px at 10% -10%, rgba(14,165,233,0.12), transparent 60%),
    radial-gradient(1200px 800px at 110% 10%, rgba(16,185,129,0.12), transparent 60%),
    var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.container{max-width:1100px;margin:0 auto;padding:0 20px}
.site-header{
  position: sticky; top:0; z-index: 1000;
  backdrop-filter: blur(12px);
  background: linear-gradient(to right, rgba(255,255,255,0.65), rgba(255,255,255,0.4));
  border-bottom: 1px solid var(--border);
}
[data-theme="dark"] .site-header{
  background: linear-gradient(to right, rgba(11,18,32,0.65), rgba(11,18,32,0.45));
}
.nav{display:flex; align-items:center; justify-content:space-between; height:64px}
.brand{display:flex; align-items:center; gap:12px; text-decoration:none; color:var(--text)}
.logo{font-weight:800; letter-spacing:1px}
.brand-sub{font-size:.85rem; color:var(--muted)}

.menu{display:flex; gap:18px}
.menu a{
  color:var(--text);
  text-decoration:none;
  padding:8px 10px;
  border-radius:12px;
  border:1px solid transparent;
}
.menu a.active, .menu a:hover{
  border-color: var(--accentA);
  background: linear-gradient(90deg, rgba(14,165,233,0.10), rgba(16,185,129,0.10));
}

.nav-right{display:flex; align-items:center; gap:10px}
.nav-toggle,.theme-toggle{background:none; border:1px solid var(--border); color:var(--text); font-size:1rem; padding:6px 10px; border-radius:10px}
.nav-toggle{display:none}
.theme-toggle{cursor:pointer}

.hero{padding:80px 0 40px; position:relative; overflow:hidden}
.hero-inner{display:grid; grid-template-columns:1.2fr .8fr; gap:32px; align-items:center}
.hero-art{position:relative; height:300px}
.orb{position:absolute; border-radius:9999px; filter: blur(22px); opacity:.7}
.orb-a{width:220px; height:220px; background: radial-gradient(circle, var(--accentA), transparent); left:10%; top:10%}
.orb-b{width:200px; height:200px; background: radial-gradient(circle, var(--accentB), transparent); right:10%; bottom:5%}
.orb-c{width:160px; height:160px; background: radial-gradient(circle, #22d3ee, transparent); left:45%; top:55%}

.gradient-text{
  background: linear-gradient(90deg, var(--accentA), var(--accentB));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lead{font-size:1.15rem; color:var(--text); opacity:.92}
.cta-row{display:flex; gap:12px; margin-top:18px}
.btn{display:inline-block; text-decoration:none; padding:10px 16px; border-radius:12px; border:1px solid var(--accentA)}
.btn.primary{background: linear-gradient(90deg, rgba(14,165,233,0.18), rgba(16,185,129,0.18));}
.btn.ghost{border-color: var(--border)}

.section{padding:40px 0}
.section-title{font-size:1.6rem; margin:0 0 12px 0}

.grid{display:grid; gap:16px}
.people-grid{grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));}
.project-grid{grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));}

.card{
  background: linear-gradient(180deg, rgba(255,255,255,0.90), rgba(255,255,255,0.85));
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  overflow:hidden;
  transition: transform .2s ease, border-color .2s ease;
}
[data-theme="dark"] .card{
  background: linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.03));
}
.card:hover{ transform: translateY(-3px); border-color: rgba(14,165,233,0.55)}

.card-body{padding:14px 16px}
.person-teaser .avatar{height:220px; background: rgba(2,12,27,0.03); display:flex; align-items:center; justify-content:center}
[data-theme="dark"] .person-teaser .avatar{background: rgba(255,255,255,0.04)}
.person-teaser img{width:100%; height:100%; object-fit:cover}
.placeholder{color:var(--muted); font-size:.9rem}

.page-hero{padding:40px 0 10px; border-bottom:1px solid var(--border); background: linear-gradient(90deg, rgba(14,165,233,0.08), rgba(16,185,129,0.08))}
.subtitle{color:var(--muted); margin:6px 0 0 0}

.tags{display:flex; flex-wrap:wrap; gap:6px; padding:0 16px 14px 16px}
.tag{padding:4px 8px; border-radius:9999px; border:1px solid var(--border); font-size:.8rem; color:var(--text)}

.pub-filters{display:flex; gap:10px; margin-top:14px}
.pub-filters input, .pub-filters select{
  background: #fff;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding:8px 10px;
}
[data-theme="dark"] .pub-filters input, [data-theme="dark"] .pub-filters select{
  background: rgba(255,255,255,0.08);
  color: var(--text);
}

.pub-list{display:grid; gap:14px}
.pub{padding:14px 16px; border:1px solid var(--border); border-radius:16px; background: #fff}
[data-theme="dark"] .pub{background: rgba(255,255,255,0.04)}
.pub-title{margin:0 0 6px 0}
.pub-authors, .pub-venue{margin:0; color:var(--muted)}
.pub-links{margin-top:8px; display:flex; gap:8px; flex-wrap:wrap}
.chip{padding:6px 10px; border:1px solid var(--border); border-radius:9999px; color:var(--text); text-decoration:none; background:#fff}
[data-theme="dark"] .chip{background:transparent}

.person{display:grid; gap:20px}
.person-card{display:grid; grid-template-columns:160px 1fr; gap:16px; background: #fff; border:1px solid var(--border); border-radius:16px; padding:16px}
[data-theme="dark"] .person-card{background: rgba(255,255,255,0.04)}
.person-photo img{width:100%; height:100%; object-fit:cover; border-radius:12px}
.links{display:flex; flex-wrap:wrap; gap:8px; margin-top:8px}
.links a{padding:6px 10px; border:1px solid var(--border); border-radius:9999px; text-decoration:none; color:var(--text); background:#fff}
[data-theme="dark"] .links a{background:transparent}

.prose{margin-top:10px}
.prose p{color: var(--text)}

.site-footer{margin-top:50px; border-top:1px solid var(--border); padding:24px 0; background: linear-gradient(90deg, rgba(14,165,233,0.08), rgba(16,185,129,0.08))}
.footer-grid{display:flex; align-items:center; justify-content:space-between}
.muted{color: var(--muted)}

@media (max-width: 860px){
  .hero-inner{grid-template-columns:1fr}
  .nav-toggle{display:block}
  .menu{display:none}
  .menu.open{display:flex; flex-direction:column; position:absolute; right:16px; top:56px; background: var(--panel); padding:10px; border:1px solid var(--border); border-radius:12px}
  .person-card{grid-template-columns:1fr}
}

.project .thumb-wrap{
  aspect-ratio: 16 / 9;
  width: 100%;
  background: linear-gradient(180deg, rgba(14,165,233,0.12), rgba(16,185,129,0.12));
  border-bottom: 1px solid var(--border);
}
.project .thumb-wrap img{
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.project .thumb-wrap.placeholder{
  /* keeps layout even when no image is provided */
  background: linear-gradient(180deg, rgba(14,165,233,0.10), rgba(16,185,129,0.10));
}
.card.project{
  overflow: hidden;            /* lets the top image take the card radius */
  border-radius: 16px;
}