/* Updated styles.css with explicit .dark theme support */
:root{
  --bg:#ffffff; --card:#ffffff; --muted:#6b7280; --accent:#0b66c2; --text:#0f1720; --glass: rgba(15,23,42,0.03);
  --max-width:1100px;
}
.dark{ --bg:#07101a; --card:#07161d; --muted:#9aa6b2; --accent:#7fb0ff; --text:#e6eef9; --glass: rgba(255,255,255,0.02); }
*{box-sizing:border-box}
html,body{height:100%;}
body{font-family:Inter, system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial; color:var(--text); background:var(--bg); margin:0; font-size:16px; line-height:1.6;-webkit-font-smoothing:antialiased}
.container{max-width:var(--max-width); margin:0 auto; padding:1rem}

/* Navbar */
.navbar{background:var(--card); border-bottom:1px solid rgba(0,0,0,0.06)}
.nav-inner{display:flex; align-items:center; gap:1rem; justify-content:space-between}
.brand{font-weight:800; font-size:1.125rem; color:var(--text); text-decoration:none}
.nav-toggle{display:none; background:none; border:none; font-size:1.25rem}
.nav-links{display:flex; gap:0.75rem; align-items:center}
.nav-link{color:var(--muted); text-decoration:none; font-weight:600}
.nav-link:hover{color:var(--accent)}
.btn{padding:.5rem .75rem; border-radius:8px; border:1px solid transparent; background:var(--accent); color:white; text-decoration:none}
.btn-ghost{background:transparent; color:var(--accent); border:1px solid rgba(11,102,194,0.12); padding:.45rem .6rem}
.btn-sm{padding:.35rem .5rem; font-size:.9rem}
.btn-icon{background:transparent; border:none; cursor:pointer}

/* Hero */
.hero{padding:1.25rem 0}
.hero-grid{display:grid; grid-template-columns:1fr; gap:1rem}
@media(min-width:992px){.hero-grid{grid-template-columns:320px 1fr}}

.profile-card{background:var(--card); border-radius:12px; padding:1rem; box-shadow:0 8px 24px rgba(16,24,40,0.04); text-align:center}
.profile-img{width:220px; max-width:100%; height:auto; border-radius:12px; display:block; margin:0 auto 0.75rem}
#profileName{font-size:1.25rem; margin:.15rem 0}
.muted{color:var(--muted)}
.profile-links a{display:block; color:var(--accent); text-decoration:none; margin:.3rem 0}

.intro-card{background:linear-gradient(180deg, var(--card), #fbfdff); border-radius:12px; padding:1rem; box-shadow:0 8px 20px rgba(18,24,40,0.04)}
.lead{font-size:1.02rem}
.research-list{padding-left:1.15rem}
.research-list li{margin-bottom:.6rem}

/* Cards */
.card{background:var(--card); border-radius:12px; padding:0; margin-top:1rem; box-shadow:0 8px 18px rgba(16,24,40,0.035)}
.card-head{display:flex; justify-content:space-between; align-items:center; padding:1rem; border-bottom:1px solid rgba(0,0,0,0.04)}
.card-body{padding:1rem}

/* Timeline */
.timeline{display:flex; flex-direction:column; gap:.6rem}
.timeline-item{display:flex; gap:.75rem; align-items:flex-start; padding:.6rem}
.timeline-marker{width:44px; height:44px; border-radius:10px; display:flex; align-items:center; justify-content:center; background:var(--glass)}
.timeline-body time{font-weight:700; color:var(--muted)}
.timeline-body p{margin:.25rem 0 0 0}

/* Quick links */
.links-grid{display:grid; grid-template-columns:repeat(2,1fr); gap:.5rem}
.link-btn{display:block; padding:.5rem; border-radius:8px; background:#f8fafc; text-decoration:none; color:var(--accent); text-align:center}

/* Accessibility focus */
a:focus, button:focus{outline:3px solid rgba(11,102,194,0.15); outline-offset:2px}

/* Responsive nav */
@media(max-width:991.98px){
  .nav-toggle{display:block}
  .nav-links{flex-direction:column; gap:.5rem}
  #primaryNav[hidden]{display:none}
}

/* Small visual polish when in dark mode: adjust intro gradient */
.dark .intro-card{background:linear-gradient(180deg, var(--card), #071a26)}