/* =============================================================
   Personal homepage — al-folio inspired, plain HTML/CSS
   Tweak the CSS variables below to retheme quickly.
   ============================================================= */

:root {
  --bg: #ffffff;
  --bg-soft: #f8f9fa;
  --text: #1f2328;
  --text-soft: #57606a;
  --muted: #8b949e;
  --border: #e6e8eb;
  --accent: #0f7c8a;        /* primary accent (links, highlights) */
  --accent-soft: #e6f4f6;
  --accent-strong: #0a5c66;
  --shadow: 0 1px 2px rgba(0,0,0,.04), 0 4px 12px rgba(0,0,0,.04);
  --radius: 10px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Helvetica, Arial, sans-serif;
  --font-serif: "Source Serif Pro", Georgia, "Times New Roman", serif;
}

html[data-theme="dark"] {
  --bg: #0d1117;
  --bg-soft: #161b22;
  --text: #e6edf3;
  --text-soft: #b6bec9;
  --muted: #8b949e;
  --border: #30363d;
  --accent: #4dd0e1;
  --accent-soft: #163b40;
  --accent-strong: #80deea;
  --shadow: 0 1px 2px rgba(0,0,0,.4), 0 4px 16px rgba(0,0,0,.4);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color .2s ease, color .2s ease;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color .15s ease;
}
a:hover { color: var(--accent-strong); text-decoration: underline; }

/* ---------- Navigation ---------- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255,255,255,.85);
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  border-bottom: 1px solid var(--border);
}
html[data-theme="dark"] .navbar { background: rgba(13,17,23,.85); }

.nav-inner {
  max-width: 880px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.nav-brand {
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--text);
}
.nav-brand:hover { text-decoration: none; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}
.nav-links a {
  color: var(--text-soft);
  padding: 6px 12px;
  border-radius: 6px;
  font-weight: 500;
  font-size: .95rem;
}
.nav-links a:hover {
  background: var(--bg-soft);
  color: var(--text);
  text-decoration: none;
}
.nav-links a.active {
  color: var(--accent);
  background: var(--accent-soft);
}

.theme-toggle {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-soft);
  border-radius: 6px;
  cursor: pointer;
  width: 34px;
  height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: all .15s ease;
}
.theme-toggle:hover { color: var(--accent); border-color: var(--accent); }
.theme-toggle svg { width: 16px; height: 16px; }
html[data-theme="dark"] .theme-toggle .sun { display: inline; }
html[data-theme="dark"] .theme-toggle .moon { display: none; }
html:not([data-theme="dark"]) .theme-toggle .sun { display: none; }
html:not([data-theme="dark"]) .theme-toggle .moon { display: inline; }

/* ---------- Layout ---------- */
main {
  max-width: 880px;
  margin: 0 auto;
  padding: 48px 24px 80px;
}

section { margin-bottom: 56px; }

h1, h2, h3 { color: var(--text); line-height: 1.25; }
h1 { font-size: 2rem; margin: 0 0 8px; font-weight: 700; }
h2 {
  font-size: 1.35rem;
  margin: 0 0 20px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
  font-weight: 600;
}
h3 { font-size: 1.05rem; margin: 0 0 6px; font-weight: 600; }

p { margin: 0 0 12px; color: var(--text); }

/* ---------- Hero / profile ---------- */
.hero {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 36px;
  align-items: start;
  margin-bottom: 56px;
}
.hero-photo {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--border);
  background: var(--bg-soft);
  box-shadow: var(--shadow);
}
.hero-photo-placeholder {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-soft), var(--bg-soft));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: var(--accent);
  font-weight: 600;
  border: 1px solid var(--border);
}
.hero-meta { color: var(--text-soft); font-size: .98rem; margin-top: 4px; }
.hero-meta a { color: var(--text-soft); }
.hero-meta a:hover { color: var(--accent); }
.hero-bio { margin-top: 16px; }
.hero-bio strong { color: var(--text); }

.socials {
  display: flex;
  gap: 14px;
  margin-top: 18px;
  flex-wrap: wrap;
}
.socials a {
  color: var(--text-soft);
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: .92rem;
}
.socials a:hover { color: var(--accent); text-decoration: none; }
.socials svg { width: 16px; height: 16px; }

@media (max-width: 640px) {
  .hero { grid-template-columns: 1fr; text-align: center; }
  .hero-photo, .hero-photo-placeholder { margin: 0 auto; }
  .socials { justify-content: center; }
}

/* ---------- News ---------- */
.news-list {
  list-style: none;
  padding: 0;
  margin: 0;
  border-left: 2px solid var(--border);
  max-height: 280px;
  overflow-y: auto;
}
.news-list li {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 16px;
  padding: 10px 16px;
  border-bottom: 1px dashed var(--border);
}
.news-list li:last-child { border-bottom: none; }
.news-date {
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  font-size: .9rem;
  white-space: nowrap;
}
.news-text { color: var(--text); font-size: .95rem; }

@media (max-width: 640px) {
  .news-list li { grid-template-columns: 1fr; gap: 2px; }
}

/* ---------- Publications ---------- */
.year-header {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent);
  margin: 32px 0 14px;
  padding-top: 8px;
}
.year-header:first-of-type { margin-top: 0; }

.pub {
  padding: 14px 0;
  border-bottom: 1px solid var(--border);
}
.pub:last-child { border-bottom: none; }

.pub-title {
  font-weight: 600;
  color: var(--text);
  font-size: 1rem;
  margin-bottom: 4px;
}
.pub-authors {
  font-size: .92rem;
  color: var(--text-soft);
  margin-bottom: 2px;
}
.pub-authors .me { color: var(--text); font-weight: 700; }
.pub-venue {
  font-style: italic;
  color: var(--text-soft);
  font-size: .9rem;
  margin-bottom: 8px;
}
.pub-links {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.pub-link {
  display: inline-block;
  padding: 2px 9px;
  font-size: .78rem;
  font-weight: 500;
  border-radius: 4px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  border: 1px solid transparent;
  transition: all .15s ease;
}
.pub-link:hover {
  background: var(--accent);
  color: #fff;
  text-decoration: none;
}
html[data-theme="dark"] .pub-link { color: var(--accent); }
html[data-theme="dark"] .pub-link:hover { color: #0d1117; }

.pub-badge {
  display: inline-block;
  padding: 1px 7px;
  font-size: .72rem;
  font-weight: 600;
  border-radius: 3px;
  background: var(--text);
  color: var(--bg);
  margin-left: 6px;
  vertical-align: middle;
  letter-spacing: .02em;
}

/* ---------- Education / Services tables ---------- */
.info-block {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px 24px;
  padding: 6px 0;
  border-bottom: 1px solid var(--border);
}
.info-block:last-child { border-bottom: none; }
.info-block .meta { color: var(--text-soft); font-size: .9rem; }

.kv-list {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 10px 20px;
}
.kv-list dt { color: var(--text); font-weight: 600; font-size: .95rem; }
.kv-list dd { margin: 0; color: var(--text-soft); font-size: .95rem; }

@media (max-width: 640px) {
  .kv-list { grid-template-columns: 1fr; gap: 2px 0; }
  .kv-list dd { margin-bottom: 10px; }
}

/* ---------- Footer ---------- */
footer {
  max-width: 880px;
  margin: 0 auto;
  padding: 24px;
  color: var(--muted);
  font-size: .85rem;
  text-align: center;
  border-top: 1px solid var(--border);
}