:root {
  --ink:        #1a1a1a;
  --ink-soft:   rgba(0,0,0,0.62);
  --ink-faint:  rgba(0,0,0,0.42);
  --accent:     #3873b2;
  --accent-deep:#26517d;
  --paper:      #ffffff;
  --surface:    #ffffff;
  --line:       #e8e8e8;
  --tile-bg:    #fafafa;
  --font-sans:    'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
  --font-heading: 'Manrope', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
  --font-mono:    'IBM Plex Mono', ui-monospace, 'SFMono-Regular', Consolas, monospace;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 6px 18px rgba(0,0,0,0.08);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scrollbar-gutter: stable; }
body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.55;
}
a { color: var(--accent); text-decoration: none; }
a:hover { opacity: 0.75; }
h1, h2, h3 { font-family: var(--font-heading); font-weight: 700; margin: 0; color: var(--ink); letter-spacing: -0.01em; }
u { text-decoration: underline; }

/* ---- Nav ---- */
.nav {
  position: sticky; top: 0; z-index: 200;
  background: rgba(255,255,255,0.92);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav__inner {
  max-width: 1100px; margin: 0 auto;
  padding: 0.85rem 1.5rem;
  display: flex; align-items: center; gap: 1.5rem; flex-wrap: wrap;
}
.nav__brand {
  display: flex; align-items: center; gap: 0.6rem;
  font-family: var(--font-heading); font-weight: 700;
  color: var(--ink); font-size: 1.05rem; margin-right: auto;
}
.nav__brand img { height: 32px; width: 32px; object-fit: contain; border-radius: 50%; }
.nav__links { display: flex; align-items: center; gap: 1.5rem; flex-wrap: wrap; }
.nav__links a {
  display: inline-flex; align-items: center;
  color: var(--ink-soft);
  font-size: 0.85rem; font-weight: 500;
  line-height: 1;
  border-bottom: 2px solid transparent; padding-bottom: 4px;
}
.nav__links a:hover { color: var(--ink); opacity: 1; }
.nav__links a.current { color: var(--accent); border-bottom-color: var(--accent); }
.nav__tools {
  display: flex; align-items: center;
  border-left: 1px solid var(--line);
  padding-left: 1.5rem;
}
.nav__tools a {
  display: inline-flex; align-items: center; line-height: 1.2;
  color: var(--ink-faint);
  font-weight: 400;
  font-size: 0.85rem;
}

/* ---- Layout ---- */
.page-head {
  max-width: 1100px; margin: 0 auto;
  display: flex; align-items: center; gap: 1.5rem;
  padding: 2.5rem 1.5rem 1rem;
}
.page-head__photo {
  height: 220px; width: 220px; object-fit: cover; object-position: center 18%;
  flex-shrink: 0; border-radius: 50%;
  box-shadow: var(--shadow-md);
}
.page-head h1 { font-size: 2.2rem; color: var(--ink); }
.page-head p { margin: 0.3rem 0 0; color: var(--ink-soft); font-size: 1rem; }
.page-head__affil { margin-top: 0.5rem !important; font-size: 0.9rem !important; }
.page-head__affil a { font-weight: 600; }
.page-head__contact { display: flex; justify-content: flex-start; margin-top: 0.9rem; gap: 0.25rem; }
@media (max-width: 640px) {
  .page-head { flex-direction: column; text-align: center; padding-top: 2rem; }
  .page-head__photo { height: 170px; width: 170px; }
  .page-head__contact { justify-content: center; }
}

.container {
  max-width: 1100px; margin: 0 auto 2rem;
  background: var(--surface);
  padding: 2rem 3rem;
  border-radius: var(--radius-lg);
  position: relative;
  overflow: hidden;
}
@media (max-width: 640px) { .container { padding: 1.25rem 1.25rem; margin: 0 1rem 1.5rem; } }

section { scroll-margin-top: 5.5rem; }

.note { position: relative; z-index: 1; padding: 1.1rem 0; }
.note p { margin: 0 0 1rem; }
.note ul { margin: 0 0 1rem; padding-left: 1.25rem; line-height: 1.65; }

.panel {
  background: var(--tile-bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: 1.75rem 2rem;
  margin-top: 1.5rem;
}
.panel .section-heading { font-size: 1.3rem; }

.section-heading {
  font-size: 1.5rem; margin: 0 0 0.75rem;
}
.section-intro { color: var(--ink-soft); margin: 0 0 0.5rem; }

.pub-group + .pub-group,
.tool-group + .tool-group,
.project-group + .project-group { margin-top: 2.25rem; }

.pub-group__title,
.kicker {
  display: flex; align-items: center; gap: 0.6rem;
  font-size: 1.02rem; margin-bottom: 0.75rem;
  padding-left: 0.85rem;
  border-left: 3px solid var(--accent);
  color: var(--accent-deep);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-family: var(--font-mono);
  font-weight: 600;
}

.tile-grid {
  display: grid; grid-template-columns: 1fr; gap: 1.25rem; margin-top: 1.25rem;
}
@media (min-width: 640px)  { .tile-grid { grid-template-columns: 1fr 1fr; } }
@media (min-width: 1100px) { .tile-grid { grid-template-columns: 1fr 1fr 1fr; } }
@media (min-width: 1100px) { .tile-grid--two { grid-template-columns: 1fr 1fr; } }

.tile-card {
  background: var(--tile-bg); border: 1px solid var(--line); border-radius: var(--radius-md);
  padding: 1.3rem 1.5rem; display: flex; flex-direction: column; gap: 0.35rem;
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}
.tile-card:hover { box-shadow: var(--shadow-sm); transform: translateY(-2px); }
.tile-card__title { font-family: var(--font-heading); font-size: 1rem; font-weight: 700; color: var(--ink); }
.tile-card__title a { color: inherit; }
.tile-card__meta { font-size: 0.78rem; color: var(--accent); font-weight: 600; font-family: var(--font-mono); }
.tile-card p { margin: 0.3rem 0 0; font-size: 0.87rem; line-height: 1.6; color: var(--ink-soft); }

/* ---- CV page ---- */
.cv-actions { display: flex; gap: 1rem; align-items: center; margin: 0.5rem 0 1.5rem; flex-wrap: wrap; }
.cv-actions a.btn {
  display: inline-flex; align-items: center; gap: 0.4rem;
  background: var(--ink); color: #fff;
  padding: 0.6rem 1.1rem; border-radius: 999px;
  font-size: 0.85rem; font-weight: 600;
}
.cv-actions a.btn:hover { opacity: 0.85; }
.cv-embed {
  width: 100%; height: 80vh; min-height: 500px;
  border: 1px solid var(--line); border-radius: var(--radius-md);
  background: var(--tile-bg);
}

footer.footer {
  max-width: 1100px; margin: 1rem auto 3rem;
  padding: 1.5rem 1.5rem 0;
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem;
  color: var(--ink-faint); font-size: 0.85rem;
}
.contact a { display: inline-flex; align-items: center; justify-content: center; }
.contact img {
  height: 34px; width: 34px; object-fit: contain; padding: 4px;
  filter: grayscale(100%) sepia(100%) hue-rotate(175deg) saturate(350%) brightness(0.9);
  opacity: 0.85;
  transition: opacity 0.2s ease, filter 0.2s ease;
}
.contact a:hover img {
  filter: grayscale(100%) sepia(100%) hue-rotate(175deg) saturate(500%) brightness(0.75);
  opacity: 1;
}

.to-top {
  position: fixed; right: 1.5rem; bottom: 1.5rem; z-index: 150;
  display: flex; align-items: center; justify-content: center;
  height: 44px; width: 44px;
  background: var(--ink);
  color: #fff;
  border-radius: 50%;
  box-shadow: var(--shadow-md);
  font-size: 1.1rem;
  line-height: 1;
}
.to-top:hover { opacity: 0.85; }
@media (max-width: 640px) {
  .to-top { right: 1rem; bottom: 1rem; height: 40px; width: 40px; }
}