:root{
  --bg:#f8f7fb;
  --panel:#ffffff;
  --panel-line:#e6e3f0;
  --text:#181521;
  --text-dim:#615c72;
  --accent:#7c3aed;
  --accent-dim:#d9cdf7;
  --accent-soft:#f1ecfc;
  --radius:10px;
  --maxw:960px;
}

[data-theme="dark"]{
  --bg:#100e1a;
  --panel:#17141f;
  --panel-line:#2b2740;
  --text:#efeef5;
  --text-dim:#a29bb5;
  --accent:#a78bfa;
  --accent-dim:#3d3560;
  --accent-soft:#221c34;
}

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

html{ scroll-behavior:smooth; }

@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  *{ animation-duration:0.001ms !important; transition-duration:0.001ms !important; }
}

body{
  background:var(--bg);
  color:var(--text);
  font-family:'Inter', sans-serif;
  font-size:16px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  transition:background-color 0.2s, color 0.2s;
}

a{ color:inherit; }

::selection{ background:var(--accent); color:#ffffff; }

.wrap{ max-width:var(--maxw); margin:0 auto; padding:0 28px; position:relative; z-index:1; }

/* ---------- nav ---------- */
header.nav{
  position:sticky; top:0; z-index:20;
  background:color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--panel-line);
}
.nav-inner{
  max-width:var(--maxw); margin:0 auto; padding:16px 28px;
  display:flex; align-items:center; justify-content:space-between; gap:20px;
}
.mark{
  font-family:'Sora', sans-serif;
  font-weight:700; font-size:15px; letter-spacing:-0.01em;
  display:flex; align-items:center; gap:8px;
  white-space:nowrap;
  text-decoration:none; color:var(--text);
  transition:opacity 0.15s;
}
.mark:hover, .mark:focus-visible{ opacity:0.7; outline:none; }
nav.links{ display:flex; gap:24px; font-size:13.5px; margin-left:auto; }
nav.links a{ text-decoration:none; color:var(--text-dim); transition:color 0.15s; font-weight:500; position:relative; padding-bottom:2px; }
nav.links a:hover, nav.links a:focus-visible{ color:var(--accent); outline:none; }
nav.links a.active{ color:var(--accent); }
nav.links a.active::after{
  content:""; position:absolute; left:0; right:0; bottom:-6px; height:2px; background:var(--accent); border-radius:2px;
}
.links-mobile a.active{ color:var(--accent); }

.nav-actions{ display:flex; align-items:center; gap:10px; }

.theme-toggle{
  background:var(--panel); border:1px solid var(--panel-line); color:var(--text);
  width:36px; height:36px; border-radius:8px; cursor:pointer;
  display:flex; align-items:center; justify-content:center;
  font-size:15px; transition:border-color 0.15s, color 0.15s;
}
.theme-toggle:hover, .theme-toggle:focus-visible{ border-color:var(--accent); color:var(--accent); outline:none; }

.nav-burger{
  display:none; flex-direction:column; gap:4px;
  background:none; border:none; cursor:pointer; padding:6px;
}
.nav-burger span{ width:20px; height:2px; background:var(--text); display:block; }

.links-mobile{
  display:none;
  flex-direction:column;
  padding:8px 28px 18px;
  gap:14px;
  font-size:14px;
  border-top:1px solid var(--panel-line);
}
.links-mobile a{ text-decoration:none; color:var(--text-dim); font-weight:500; }
.links-mobile.open{ display:flex; }

/* ---------- section tag ---------- */
.tag{
  display:inline-flex; align-items:center; gap:6px;
  font-family:'JetBrains Mono', monospace;
  font-size:12px; letter-spacing:0.06em; text-transform:uppercase;
  color:var(--accent);
  background:var(--accent-soft);
  padding:4px 10px;
  border-radius:999px;
  margin-bottom:18px;
}

section{ padding:60px 0; border-bottom:1px solid var(--panel-line); }
section:last-of-type{ border-bottom:none; }

h2{
  font-family:'Sora', sans-serif;
  font-weight:700;
  font-size:28px;
  margin-bottom:24px;
  letter-spacing:-0.01em;
}

.section-head{
  display:flex; align-items:center; justify-content:space-between;
  gap:20px; margin-bottom:24px; flex-wrap:wrap;
}
.section-head h2{ margin-bottom:0; }

/* ---------- hero ---------- */
.hero{ padding:96px 0 72px; border-bottom:1px solid var(--panel-line); }
.hero-grid{ display:grid; grid-template-columns:1fr auto; gap:48px; align-items:center; }
.hero-photo{
  width:280px; height:280px; border-radius:32px; overflow:hidden;
  background:var(--panel); border:1px solid var(--panel-line); flex-shrink:0;
}
.hero-photo img{ width:100%; height:100%; object-fit:cover; display:block; }
.hero-kicker{
  font-family:'JetBrains Mono', monospace; font-size:13px; color:var(--accent);
  margin-bottom:14px;
}
.hero h1{
  font-family:'Sora', sans-serif;
  font-weight:800;
  font-size:44px;
  letter-spacing:-0.02em;
  margin-bottom:14px;
}
.hero-role{ font-size:16px; color:var(--text-dim); margin-bottom:18px; line-height:1.6; }
.hero-blurb{ font-size:16px; color:var(--text); max-width:62ch; margin-bottom:28px; }
.hero-actions{ display:flex; flex-wrap:wrap; gap:12px; }

.btn{
  display:inline-flex; align-items:center; gap:6px;
  font-family:'Inter', sans-serif; font-weight:600; font-size:13px;
  padding:9px 16px;
  border-radius:8px;
  text-decoration:none;
  transition:transform 0.15s, box-shadow 0.15s, opacity 0.15s;
}
.btn-primary{ background:var(--accent); color:#ffffff; }
.btn-primary:hover{ transform:translateY(-2px); box-shadow:0 8px 20px color-mix(in srgb, var(--accent) 35%, transparent); }
.btn-ghost{ background:var(--panel); color:var(--text); border:1px solid var(--panel-line); }
.btn-ghost:hover{ border-color:var(--accent); color:var(--accent); transform:translateY(-2px); }

/* ---------- about ---------- */
.about-grid{ display:flex; flex-direction:column; gap:18px; }
.about-grid p{ color:var(--text); font-size:16px; max-width:none; }

/* ---------- focus grid ---------- */
.focus-grid{ display:grid; grid-template-columns:repeat(auto-fit, minmax(220px, 1fr)); gap:16px; }
.focus-card{
  background:var(--panel);
  border:1px solid var(--panel-line);
  border-radius:var(--radius);
  padding:22px 20px;
  transition:border-color 0.15s, transform 0.15s, box-shadow 0.15s;
}
.focus-card:hover{ border-color:var(--accent-dim); transform:translateY(-3px); box-shadow:0 10px 24px color-mix(in srgb, var(--accent) 12%, transparent); }
.focus-icon{
  display:inline-flex; align-items:center; justify-content:center;
  width:34px; height:34px; border-radius:8px;
  background:var(--accent-soft); color:var(--accent);
  font-size:16px; margin-bottom:14px;
}
.focus-card h3{ font-family:'Sora', sans-serif; font-weight:600; font-size:16px; margin-bottom:6px; }
.focus-card p{ font-size:13.5px; color:var(--text-dim); line-height:1.55; }

/* ---------- projects ---------- */
.project-grid{ display:grid; grid-template-columns:repeat(auto-fit, minmax(240px, 1fr)); gap:16px; margin-bottom:20px; }
.project-card{
  display:block;
  background:var(--panel);
  border:1px solid var(--panel-line);
  border-radius:var(--radius);
  padding:22px 20px;
  text-decoration:none; color:var(--text);
  transition:border-color 0.15s, transform 0.15s, box-shadow 0.15s;
}
.project-card:hover{ border-color:var(--accent-dim); transform:translateY(-3px); box-shadow:0 10px 24px color-mix(in srgb, var(--accent) 12%, transparent); }
.project-head{ display:flex; align-items:center; margin-bottom:14px; }
.project-icon{
  display:inline-flex; align-items:center; justify-content:center;
  width:34px; height:34px; border-radius:8px;
  background:var(--accent-soft); color:var(--accent); font-size:16px;
}
.project-card h3{ font-family:'Sora', sans-serif; font-weight:600; font-size:16px; margin-bottom:8px; }
.project-card p{ font-size:13.5px; color:var(--text-dim); line-height:1.55; margin-bottom:14px; }
.project-tag{
  font-family:'JetBrains Mono', monospace; font-size:11.5px; color:var(--accent);
  background:var(--accent-soft); padding:4px 10px; border-radius:999px;
}
.see-more{
  display:inline-flex; align-items:center; gap:7px;
  font-family:'Inter', sans-serif; font-weight:600; font-size:13px; color:var(--text);
  background:var(--panel); border:1px solid var(--panel-line);
  padding:8px 14px; border-radius:8px;
  text-decoration:none;
  transition:border-color 0.15s, color 0.15s, transform 0.15s;
}
.see-more:hover{ border-color:var(--accent); color:var(--accent); transform:translateY(-2px); }
.see-more svg{ display:block; }


/* ---------- publications ---------- */
.pub-list{ display:flex; flex-direction:column; gap:14px; margin-bottom:20px; }
.pub-item{
  background:var(--panel); border:1px solid var(--panel-line); border-radius:var(--radius);
  padding:18px 20px;
}
.pub-title{ font-family:'Sora', sans-serif; font-weight:600; font-size:15px; margin-bottom:6px; line-height:1.45; }
.pub-meta{ font-size:13px; color:var(--text-dim); }

/* ---------- skills ---------- */
.skills-grid{ display:grid; grid-template-columns:repeat(auto-fit, minmax(260px, 1fr)); gap:20px; }
.skill-group h4{ font-family:'Sora', sans-serif; font-weight:600; font-size:14px; margin-bottom:10px; color:var(--text); }
.skill-group .chip-row{ display:flex; flex-wrap:wrap; gap:8px; }
.skill-group .chip{
  font-family:'Inter', sans-serif; font-size:12.5px; font-weight:500;
  padding:6px 12px;
  background:var(--accent-soft); color:var(--accent);
  border-radius:999px;
}

/* ---------- timeline ---------- */
.timeline{ position:relative; padding-left:28px; }
.timeline::before{
  content:""; position:absolute; left:5px; top:6px; bottom:6px; width:1px;
  background:var(--panel-line);
}
.t-item{ position:relative; padding-bottom:34px; }
.t-item:last-child{ padding-bottom:0; }
.t-item::before{ display:none; }
.t-head{ display:flex; align-items:center; }
.t-dot{
  width:10px; height:10px; flex-shrink:0; border-radius:2px;
  background:var(--bg); border:2px solid var(--accent);
  margin-left:-28px; margin-right:14px;
}
.t-item .yr{ font-family:'JetBrains Mono', monospace; font-size:12px; color:var(--accent); letter-spacing:0.04em; }
.t-item h3{ font-family:'Sora', sans-serif; font-size:17px; font-weight:600; margin:6px 0 6px; }
.t-item p{ font-size:14px; color:var(--text-dim); max-width:none; }
.t-item .inst{ color:var(--text-dim); }
.edu-lines{ margin-top:4px; }
.edu-lines p{ font-size:14px; color:var(--text-dim); margin-bottom:4px; }
.edu-lines p:last-child{ margin-bottom:0; }
.edu-lines strong{ color:var(--text); font-weight:600; }
.country-badge{
  display:inline-block;
  font-family:'JetBrains Mono', monospace; font-size:10.5px; font-weight:600;
  letter-spacing:0.03em;
  padding:2px 7px;
  background:var(--accent-soft); color:var(--accent);
  border-radius:999px;
  vertical-align:middle;
}
.inline-link{ color:var(--accent); text-decoration:underline; text-decoration-color:var(--accent-dim); text-underline-offset:2px; }
.inline-link:hover{ text-decoration-color:var(--accent); }

/* ---------- contact ---------- */
.contact-lead{ color:var(--text-dim); margin-bottom:20px; }
.contact-row{ display:flex; flex-wrap:wrap; gap:12px; margin-bottom:24px; }
.contact-chip{
  display:inline-flex; align-items:center; gap:8px;
  font-family:'Inter', sans-serif; font-size:13px; font-weight:600;
  padding:9px 16px;
  background:var(--accent);
  border-radius:8px;
  text-decoration:none;
  color:#ffffff;
  transition:transform 0.15s, box-shadow 0.15s;
}
.contact-chip:hover, .contact-chip:focus-visible{ transform:translateY(-2px); box-shadow:0 8px 20px color-mix(in srgb, var(--accent) 35%, transparent); outline:none; }

.profile-links{ display:flex; flex-wrap:wrap; gap:10px; }
.profile-links a{
  font-family:'Inter', sans-serif; font-size:12.5px; font-weight:500;
  padding:7px 13px;
  background:var(--panel);
  border:1px solid var(--panel-line);
  border-radius:8px;
  text-decoration:none; color:var(--text);
  transition:border-color 0.15s, color 0.15s;
}
.profile-links a:hover, .profile-links a:focus-visible{ border-color:var(--accent); color:var(--accent); outline:none; }

/* ---------- footer ---------- */
.site-footer{
  border-top:1px solid var(--panel-line);
  padding-top:48px;
  position:relative; z-index:1;
}
.footer-inner{
  display:flex; justify-content:space-between; align-items:flex-start;
  flex-wrap:wrap; gap:24px;
  padding-bottom:28px;
}
.footer-id h3{ font-family:'Sora', sans-serif; font-weight:700; font-size:18px; margin-bottom:6px; }
.footer-id p{ font-size:13.5px; color:var(--text-dim); }
.footer-links{ display:flex; flex-wrap:wrap; gap:12px; margin-left:auto; }
.icon-btn{
  display:flex; align-items:center; justify-content:center;
  width:36px; height:36px;
  background:var(--panel);
  border:1px solid var(--panel-line);
  border-radius:9px;
  color:var(--text-dim);
  text-decoration:none;
  transition:color 0.15s, border-color 0.15s, transform 0.15s;
}
.icon-btn:hover, .icon-btn:focus-visible{ color:var(--accent); border-color:var(--accent-dim); transform:translateY(-2px); outline:none; }
.icon-btn svg{ display:block; }
.icon-text{ font-family:'Sora', sans-serif; font-weight:700; font-size:13px; letter-spacing:-0.02em; }
.footer-bottom{
  border-top:1px solid var(--panel-line);
  padding:18px 28px 32px;
  font-family:'JetBrains Mono', monospace;
  font-size:12px;
  color:var(--text-dim);
}

@media (max-width:760px){
  nav.links{ display:none; }
  .nav-burger{ display:flex; }
}

@media (max-width:640px){
  .hero{ padding:64px 0 48px; }
  .hero-grid{ grid-template-columns:1fr; }
  .hero-photo{ width:190px; height:190px; order:-1; margin:0 auto; }
  .hero h1{ font-size:32px; }
  section{ padding:44px 0; }
  .footer-inner{ flex-direction:column; }
}