/* ===================== THEME TOKENS ===================== */
:root {
  --bg: #fbfaf7;
  --surface: #ffffff;
  --text: #1b1a18;
  --text-soft: #46443f;
  --muted: #8b877f;
  --border: #ece9e2;
  --border-strong: #ddd9cf;
  --accent: #3a5a9c;
  --accent-deep: #2b4680;
  --accent-soft: #eaeff7;
  --badge-green: #2f7d5b;
  --badge-green-soft: #e6f4ec;
  --badge-amber: #9a6a12;
  --badge-amber-soft: #f7efdd;
  --shadow: 0 1px 2px rgba(28, 25, 20, .04), 0 10px 30px rgba(28, 25, 20, .05);
  --radius: 14px;
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-serif: 'Newsreader', Georgia, 'Times New Roman', serif;
}

:root.dark {
  --bg: #12141a;
  --surface: #191c24;
  --text: #eceef3;
  --text-soft: #c3c6cf;
  --muted: #868b98;
  --border: #262a34;
  --border-strong: #323744;
  --accent: #8ea8e0;
  --accent-deep: #a9bdec;
  --accent-soft: #1d2432;
  --badge-green: #7ccfa6;
  --badge-green-soft: #16281f;
  --badge-amber: #dcb057;
  --badge-amber-soft: #2a2211;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 14px 34px rgba(0,0,0,.35);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 32px; }
body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  transition: background .3s ease, color .3s ease;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 2px; }
em { color: var(--text); font-style: italic; }
strong { font-weight: 600; }

/* ===================== THEME TOGGLE ===================== */
.theme-toggle {
  flex: none;
  width: 38px; height: 38px; border-radius: 11px; cursor: pointer;
  border: 1px solid var(--border-strong); background: var(--surface); color: var(--text);
  display: grid; place-items: center; box-shadow: var(--shadow); transition: transform .15s, background .2s;
}
.theme-toggle:hover { transform: translateY(-1px); }
.icon-sun { display: none; }
:root.dark .icon-moon { display: none; }
:root.dark .icon-sun { display: block; }

/* ===================== HERO ===================== */
.hero {
  position: relative; padding: 60px 24px 44px;
  background:
    radial-gradient(120% 90% at 50% -20%, var(--accent-soft) 0%, transparent 60%);
  border-bottom: 1px solid var(--border);
}
.hero-inner {
  max-width: 780px; margin: 0 auto;
  display: flex; align-items: center; gap: 42px; text-align: left;
}
.avatar {
  width: 210px; height: 210px; flex: none; border-radius: 50%; margin: 0;
  overflow: hidden;
  box-shadow: 0 10px 30px rgba(58, 90, 156, .28); border: 5px solid var(--surface);
}
.avatar-img {
  width: 100%; height: 100%; object-fit: cover; object-position: 50% 20%;
  transform: scale(2.1); transform-origin: 52% 22%; display: block;
}
.avatar-fallback {
  display: none; width: 100%; height: 100%; place-items: center;
  background: linear-gradient(145deg, var(--accent), var(--accent-deep));
  font-family: var(--font-serif); color: #fff; font-size: 44px; font-weight: 500; letter-spacing: 1px;
}
.hero-text { min-width: 0; }
.name-row { display: flex; align-items: center; gap: 14px; margin: 0 0 8px; }
.name-row .name { margin: 0; }
.name {
  font-family: var(--font-serif); font-weight: 600; font-size: clamp(28px, 4.4vw, 38px); line-height: 1.08;
  margin: 0 0 8px; letter-spacing: -.5px;
}
.role { margin: 0 0 10px; color: var(--accent-deep); font-weight: 500; font-size: 15.5px; }
.affil-inline { margin: 0 0 20px; font-size: 14px; color: var(--text-soft); line-height: 1.5; }
.affil-inline .dot { color: var(--muted); margin: 0 6px; }

.socials { display: flex; gap: 10px; justify-content: flex-start; align-items: center; flex-wrap: wrap; margin-bottom: 0; }
.socials a {
  width: 38px; height: 38px; border-radius: 10px; display: grid; place-items: center;
  border: 1px solid var(--border-strong); background: var(--surface); color: var(--text-soft);
  transition: color .18s, border-color .18s, transform .15s;
}
.socials a:hover { color: var(--accent); border-color: var(--accent); transform: translateY(-2px); text-decoration: none; }

.cv-btn {
  display: inline-flex; align-items: center; justify-content: center; height: 38px; padding: 0 20px;
  border-radius: 10px; font-weight: 600; font-size: 14px; width: auto; white-space: nowrap;
  background: var(--accent); color: #fff; transition: background .2s, transform .15s;
}
.socials a.cv-btn { width: auto; padding: 0 20px; border: 1px solid var(--accent); background: var(--accent); color: #fff; }
.socials a.cv-btn:hover { background: var(--accent-deep); border-color: var(--accent-deep); color: #fff; transform: translateY(-2px); }
.cv-btn:hover { background: var(--accent-deep); text-decoration: none; transform: translateY(-1px); }

/* ===================== STICKY NAV ===================== */
.topnav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.topnav-inner {
  max-width: 900px; margin: 0 auto; padding: 0 68px 0 28px; height: 58px;
  display: flex; align-items: center; justify-content: space-between; gap: 20px;
}
.topnav-brand {
  font-family: var(--font-serif); font-weight: 600; font-size: 16px; color: var(--text);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  opacity: 0; transform: translateY(4px); pointer-events: none;
  transition: opacity .25s ease, transform .25s ease;
}
.topnav.brand-visible .topnav-brand { opacity: 1; transform: none; pointer-events: auto; }
.topnav-brand:hover { color: var(--accent); text-decoration: none; }
.topnav-links { display: flex; gap: 22px; }
.topnav-links a { font-size: 14px; font-weight: 500; color: var(--muted); }
.topnav-links a:hover { color: var(--text); text-decoration: none; }
.topnav-links a.active { color: var(--accent); }

/* ===================== LAYOUT ===================== */
.layout {
  max-width: 900px; margin: 0 auto; padding: 0 28px;
}

/* ===================== CONTENT ===================== */
.content { padding: 48px 0 40px; min-width: 0; }
.block { margin-bottom: 52px; }
.block-title {
  font-family: var(--font-serif); font-size: 22px; font-weight: 600; margin: 0 0 22px;
  padding-bottom: 10px; border-bottom: 1px solid var(--border); letter-spacing: -.2px;
}

/* About */
.intro { font-size: 15.5px; line-height: 1.65; margin: 0 0 14px; color: var(--text); }
.block p { margin: 0 0 12px; font-size: 14.5px; line-height: 1.65; color: var(--text-soft); }
#about p:last-child { margin-bottom: 0; }
.about-sub {
  font-family: var(--font-serif); font-size: 15px; font-weight: 600; color: var(--text) !important;
  margin: 22px 0 12px !important; letter-spacing: -.2px;
}

/* About tabs */
.tabs { margin-top: 20px; }
.tab-bar { display: inline-flex; gap: 4px; padding: 4px; margin-bottom: 18px;
  background: var(--accent-soft); border-radius: 12px; }
.tab {
  font-family: var(--font-sans); font-size: 14px; font-weight: 600; cursor: pointer;
  padding: 8px 18px; border: none; border-radius: 9px; background: transparent; color: var(--muted);
  transition: color .18s, background .18s, box-shadow .18s;
}
.tab:hover { color: var(--text); }
.tab.active { color: var(--accent-deep); background: var(--surface); box-shadow: var(--shadow); }
.tab-panel { animation: fade .25s ease; }
.tab-panel[hidden] { display: none; }
.tab-panel p { margin: 0 0 14px; }
.tab-panel p:last-child { margin-bottom: 0; }
@keyframes fade { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }

.focus-list { list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.focus-list li {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px 18px; box-shadow: var(--shadow); transition: transform .18s, border-color .2s;
}
.focus-list li:hover { transform: translateY(-2px); border-color: var(--border-strong); }
.focus-list h3 { margin: 0 0 6px; font-size: 15px; font-weight: 600; color: var(--text);
  padding-left: 13px; position: relative; }
.focus-list h3::before { content: ''; position: absolute; left: 0; top: 5px; width: 5px; height: 5px;
  border-radius: 50%; background: var(--accent); }
.focus-list p { margin: 0; font-size: 13.5px; color: var(--text-soft); line-height: 1.55; }
@media (max-width: 560px) { .focus-list { grid-template-columns: 1fr; } }

/* News */
.news { list-style: none; margin: 0; padding: 0; }
.news li { display: grid; grid-template-columns: 88px 1fr; gap: 16px; padding: 9px 0; align-items: baseline; }
.news li + li { border-top: 1px dashed var(--border); }
.news-date {
  font-family: var(--font-serif); font-size: 14px; font-weight: 500; color: var(--muted); white-space: nowrap;
}
.news-text { color: var(--text-soft); font-size: 15px; }

/* Publications */
.pub-note-eq { font-size: 13px; color: var(--muted); margin: -8px 0 20px; }
.pub-note-eq span { color: var(--accent); font-weight: 700; }

/* Topic filter */
.pub-filter { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 22px; }
.chip {
  font-family: var(--font-sans); font-size: 13px; font-weight: 500; cursor: pointer;
  padding: 6px 14px; border-radius: 999px; border: 1px solid var(--border-strong);
  background: var(--surface); color: var(--text-soft);
  display: inline-flex; align-items: center; gap: 7px;
  transition: color .18s, background .18s, border-color .18s, transform .12s;
}
.chip:hover { color: var(--accent); border-color: var(--accent); transform: translateY(-1px); }
.chip.active { color: #fff; background: var(--accent); border-color: var(--accent); }
.chip-count {
  font-size: 11px; font-weight: 600; line-height: 1; padding: 2px 6px; border-radius: 999px;
  background: var(--accent-soft); color: var(--accent);
}
.chip.active .chip-count { background: rgba(255,255,255,.22); color: #fff; }

.pub-list { position: relative; }
.pub {
  position: relative; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); margin-bottom: 14px; padding: 20px 22px;
  box-shadow: var(--shadow); transition: transform .18s, border-color .2s, opacity .2s;
}
.pub.is-hidden { display: none; }
.pub:hover { transform: translateY(-2px); border-color: var(--border-strong); }
.pub-empty { text-align: center; color: var(--muted); font-size: 14px; padding: 20px 0; }

/* Topic tags on card */
.pub-topics { display: flex; flex-wrap: wrap; gap: 7px; margin: 12px 0 14px; }
.pub-topics span {
  font-size: 12px; font-weight: 500; cursor: pointer; color: var(--accent);
  background: var(--accent-soft); padding: 3px 11px; border-radius: 999px;
  transition: background .18s, transform .12s;
}
.pub-topics span:hover { background: var(--accent); color: #fff; transform: translateY(-1px); }
.pub-tag {
  display: inline-block; font-size: 12px; font-weight: 600; letter-spacing: .3px;
  padding: 3px 11px; border-radius: 999px; margin-bottom: 11px;
}
.pub-tag--accepted { color: var(--badge-green); background: var(--badge-green-soft); }
.pub-tag--review { color: var(--badge-amber); background: var(--badge-amber-soft); }
.pub-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 4px; }
.pub-top .pub-tag { margin-bottom: 0; }
.pub-link {
  font-size: 13px; font-weight: 600; color: var(--accent); white-space: nowrap;
}
.pub-link:hover { color: var(--accent-deep); }
.pub-title { font-family: var(--font-serif); font-size: 18px; line-height: 1.35; font-weight: 600; margin: 0 0 8px; color: var(--text); }
.pub-authors { margin: 0 0 5px; font-size: 14.5px; color: var(--text-soft); line-height: 1.55; }
.pub-authors strong { color: var(--text); }
.pub-venue { margin: 0; font-size: 13.5px; color: var(--muted); font-style: italic; }
.pub-eq { margin: 4px 0 0; font-size: 12.5px; color: var(--muted); }
.pub-eq span { color: var(--accent); font-weight: 600; }
.pub-links a {
  display: inline-flex; align-items: center; font-size: 13px; font-weight: 600;
  padding: 5px 14px; border-radius: 9px; border: 1px solid var(--border-strong); color: var(--text-soft);
}
.pub-links a:hover { color: var(--accent); border-color: var(--accent); text-decoration: none; }

/* Timeline / Journey */
.timeline { position: relative; }
.tl-row { display: grid; grid-template-columns: 132px 1fr; gap: 22px; padding-bottom: 22px; }
.tl-row:last-child { padding-bottom: 0; }
.tl-when { font-family: var(--font-serif); font-size: 14px; color: var(--muted); padding-top: 20px; }
.tl-card {
  position: relative; background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 18px 22px; box-shadow: var(--shadow);
  transition: transform .18s, border-color .2s;
}
.tl-card:hover { transform: translateY(-2px); border-color: var(--border-strong); }
.tl-parallel { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; align-items: start; }
.tl-parallel .tl-card::before { top: 22px; }
.tl-parallel .tl-card:not(:first-child)::before { display: none; }
.tl-card::before {
  content: ''; position: absolute; left: -23px; top: 28px; width: 9px; height: 9px; border-radius: 50%;
  background: var(--accent); box-shadow: 0 0 0 4px var(--bg);
}
.tl-card h3 { margin: 0 0 3px; font-size: 16.5px; font-weight: 600; }
.tl-org { margin: 0 0 9px !important; color: var(--accent-deep) !important; font-size: 13.5px; font-weight: 500; }
.tl-card p { margin: 0; color: var(--text-soft); font-size: 14.5px; }
.tl-tags { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 12px; }
.tl-tags span {
  font-size: 12px; font-weight: 500; color: var(--accent); background: var(--accent-soft);
  padding: 3px 10px; border-radius: 999px;
}

/* Education */
.edu-row { display: grid; grid-template-columns: 132px 1fr; gap: 22px; padding: 14px 0; }
.edu-row + .edu-row { border-top: 1px solid var(--border); }
.edu-when { font-family: var(--font-serif); font-size: 14px; color: var(--muted); }
.edu-body h3 { margin: 0 0 4px; font-size: 16.5px; font-weight: 600; }
.edu-body p { margin: 0; color: var(--text-soft); font-size: 14.5px; }
.edu-sub { color: var(--muted) !important; font-size: 13.5px !important; margin-top: 3px !important; }

/* Awards */
.awards { list-style: none; margin: 0; padding: 0; }
.awards li { display: grid; grid-template-columns: 44px 1fr; gap: 16px; padding: 14px 0; align-items: start; }
.awards li + li { border-top: 1px solid var(--border); }
.award-badge {
  font-family: var(--font-serif); font-weight: 600; font-size: 14px; color: #fff; background: var(--accent);
  width: 40px; height: 40px; border-radius: 11px; display: grid; place-items: center;
}
.awards div { color: var(--text-soft); font-size: 14.5px; }
.awards strong { color: var(--text); }
.award-date { display: block; font-size: 12.5px; color: var(--accent); font-weight: 600; margin: 2px 0 5px; }

/* Contact */
.contact-text { margin: 0 0 16px !important; }
.contact-links { display: flex; gap: 12px; flex-wrap: wrap; }
.contact-btn {
  display: inline-flex; align-items: center; gap: 8px; height: 42px; padding: 0 20px;
  border-radius: 999px; border: 1px solid var(--border-strong); background: var(--surface);
  font-size: 14.5px; font-weight: 500; color: var(--text); transition: border-color .2s, color .2s, background .2s, transform .18s;
}
.contact-btn:hover { border-color: var(--accent); color: var(--accent); text-decoration: none; transform: translateY(-2px); }
.contact-btn.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.contact-btn.primary:hover { background: var(--accent-deep); border-color: var(--accent-deep); color: #fff; }

/* Footer */
.foot { border-top: 1px solid var(--border); padding-top: 22px; }
.foot p { margin: 0; color: var(--muted); font-size: 13px; }

/* ===================== RESPONSIVE ===================== */
@media (max-width: 720px) {
  .hero { padding: 48px 20px 34px; }
  .hero-inner { flex-direction: column; gap: 22px; text-align: center; }
  .avatar { width: 150px; height: 150px; }
  .avatar-fallback { font-size: 34px; }
  .socials { justify-content: center; }
  .topnav-brand { display: none; }
  .topnav-inner { justify-content: center; }
  .topnav-links { gap: 16px; flex-wrap: wrap; justify-content: center; }
  .layout { padding: 0 22px; }
}
@media (max-width: 560px) {
  .news li, .tl-row, .edu-row { grid-template-columns: 1fr; gap: 4px; }
  .tl-when, .edu-when { padding-top: 0; }
  .tl-card::before { display: none; }
  .tl-parallel { grid-template-columns: 1fr; }
  .news-date { color: var(--accent); }
}