/* Minimal responsive LTR theme */
:root{
  --bg: #0f172a;
  --card: #111827;
  --text: #e5e7eb;
  --muted: #9ca3af;
  --accent: #38bdf8;
  --accent-2: #a78bfa;
  --radius: 14px;
  --max: 1100px;
}

*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,Inter,sans-serif;line-height:1.6}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;display:block;border-radius:12px}

.site-header{position:sticky;top:0;backdrop-filter:saturate(150%) blur(8px);background:rgba(15,23,42,.6);z-index:10;border-bottom:1px solid rgba(255,255,255,.06)}
.nav{max-width:var(--max);margin:auto;display:flex;align-items:center;justify-content:space-between;padding:12px 18px}
.brand{font-weight:700;color:var(--text)}
.menu{display:flex;gap:18px;list-style:none;margin:0;padding:0}
.menu a{color:var(--text)}
.menu-btn{display:none;background:transparent;border:1px solid rgba(255,255,255,.2);padding:6px 10px;border-radius:8px;color:var(--text)}

@media (max-width:800px){
  .menu-btn{display:block}
  body:not(.open) .menu{display:none}
  .menu{position:absolute;right:12px;left:12px;top:56px;background:rgba(17,24,39,.98);border:1px solid rgba(255,255,255,.06);border-radius:12px;flex-direction:column;padding:12px}
}

.hero{max-width:var(--max);margin:40px auto;padding:0 18px 24px;text-align:center}
.hero h1{font-size:clamp(28px,4.5vw,44px);margin:12px 0}
.accent{background:linear-gradient(90deg,var(--accent),var(--accent-2));-webkit-background-clip:text;background-clip:text;color:transparent}
.tagline{color:var(--muted);margin-top:-6px}
.cta{display:flex;gap:12px;justify-content:center;margin-top:14px;flex-wrap:wrap}
.btn{display:inline-block;background:var(--accent);color:#001119;padding:10px 16px;border-radius:10px;font-weight:600}
.btn.ghost{background:transparent;color:var(--text);border:1px solid rgba(255,255,255,.2)}
.btn.small{padding:8px 12px;font-size:14px}

.section{max-width:var(--max);margin:30px auto;padding:0 18px}
.section h2{font-size:clamp(22px,3.5vw,30px);margin-bottom:8px}
.badges{display:flex;gap:8px;flex-wrap:wrap;list-style:none;padding:0;margin:10px 0}
.badges li{background:#0b1220;border:1px solid rgba(255,255,255,.06);padding:6px 10px;border-radius:999px;color:var(--muted)}

.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
@media (max-width:900px){.grid{grid-template-columns:1fr 1fr}}
@media (max-width:600px){.grid{grid-template-columns:1fr}}

.card{background:var(--card);border:1px solid rgba(255,255,255,.06);border-radius:var(--radius);overflow:hidden}
.card-body{padding:12px}
.card h3{margin:6px 0}
.pubs{padding-left:18px}

.links{list-style:none;padding:0;display:flex;gap:14px;flex-wrap:wrap}
.links a{background:#0b1220;border:1px solid rgba(255,255,255,.06);padding:8px 12px;border-radius:10px}

.footer{max-width:var(--max);margin:30px auto 60px;padding:0 18px;color:var(--muted);text-align:center}
/* ===========================
   Light Theme Styles
   =========================== */
body.light {
  --bg: #ffffff;
  --card: #f4f4f4;
  --text: #111111;
  --muted: #555555;
  --accent: #2563eb;  /* blue */
  --accent-2: #9333ea; /* purple */
}

/* Theme toggle button styling */
#theme-toggle {
  margin-left: 12px;
  font-size: 18px;
  cursor: pointer;
  background: transparent;
  border: 1px solid rgba(255,255,255,0.3);
  padding: 6px 10px;
  border-radius: 8px;
  transition: 0.3s;
}

body.light #theme-toggle {
  border: 1px solid rgba(0,0,0,0.2);
}
.section-intro {
  max-width: 850px;
  margin: 0 auto 38px;
  text-align: center;
  line-height: 1.8;
  color: var(--muted);
}

.research-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  margin-top: 30px;
}

.research-card {
  padding: 28px;
  background: var(--card);
  border: 1px solid rgba(127, 127, 127, 0.18);
  border-radius: 16px;
  box-shadow: 0 6px 18px var(--shadow);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.research-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 28px var(--shadow);
}

.research-card h3 {
  margin: 0 0 14px;
  font-size: 1.2rem;
  line-height: 1.4;
  color: var(--text);
}

.research-card p {
  margin: 0;
  line-height: 1.75;
  color: var(--muted);
}

@media (max-width: 768px) {
  .research-grid {
    grid-template-columns: 1fr;
  }

  .research-card {
    padding: 22px;
  }
}
.publications-list {
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding-left: 24px;
}

.publications-list li {
  width: 100%;
  line-height: 1.7;
}