:root {
  --bg: #ffffff;
  --text: #0b0f14;
  --muted: #5a6b7a;
  --border: #e6e6e6;
  --accent: #0ea5a0; /* teal-ish; avoids purple per preference */
  --accent-ink: #0b3d3a;
  --btn-height: 24px; /* compact target height for buttons */
  --metrics-height: 19px; /* normalized height for Altmetric/Dimensions badges */
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0f14;
    --text: #e6edf3;
    --muted: #9aa7b3;
    --border: #1f2833;
    --accent: #22c7bf;
    --accent-ink: #0b3d3a;
  }
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

/* Prevent header/layout shift when vertical scrollbar appears between pages */
html { scrollbar-gutter: stable both-edges; }

.container {
  width: min(1100px, 92vw);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: saturate(140%) blur(8px);
  border-bottom: 1px solid var(--border);
  z-index: 50;
}
.header-inner { display: flex; align-items: center; gap: 16px; padding: 14px 0; }
.brand { font-weight: 700; color: var(--text); text-decoration: none; }
.nav { margin-left: auto; display: flex; gap: 18px; }
.nav a { color: var(--muted); text-decoration: none; }
.nav a[aria-current="page"], .nav a:hover { color: var(--text); }
.hero a, .home-featured a, .content a {
  text-decoration: none;
}
.nav-toggle { display: none; margin-left: auto; font-size: 20px; background: none; border: 0; color: var(--text); }

@media (max-width: 740px) {
  .nav { display: none; }
  .nav[data-open="true"] { display: flex; flex-direction: column; gap: 12px; padding: 12px 0; }
  .nav-toggle { display: inline-flex; }
}

.hero { padding: 0 0 18px; margin-top: 0; }
.hero-grid { display: grid; grid-template-columns: 1.3fr 1fr; gap: 22px; align-items: center; }
.hero h1 { font-size: 44px; line-height: 1.1; margin: 0 0 8px; }
.hero-links { display: flex; gap: 12px; align-items: center; margin: 6px 0 6px; flex-wrap: wrap; }
.hero-links a { color: var(--text); text-decoration: none; font-weight: 500; display: inline-flex; align-items: center; gap: 6px; }
.hero-links a:hover { text-decoration: underline; }
.hero-links .icon { width: 16px; height: 16px; vertical-align: text-bottom; }
.subtitle { color: var(--muted); margin: 0 0 10px; }
.hero-actions { display: flex; gap: 12px; }
.button { display: inline-block; padding: 10px 14px; border-radius: 10px; background: var(--accent); color: white; text-decoration: none; font-weight: 600; }
.button-outline { background: transparent; color: var(--accent); border: 1px solid color-mix(in srgb, var(--accent) 60%, var(--bg)); }
.hero-photo-wrap { display: grid; place-items: center; }
.hero-photo {
  width: 220px;
  height: 280px;
  border-radius: 16px;
  object-fit: cover;
  display: block;
  /* Use transform for visual offset without growing flow height */
  transform: translateY(86px);
  margin-left: auto;
  margin-right: 10px;
}
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-photo { width: 160px; height: 220px; transform: none; margin: 0 auto; }
}

@media (min-width: 901px) {
  /* Pull summary up more to tighten perceived gap while avoiding overlap */
  .home-summary { margin-top: -48px; }
}

/* Small phones: make the hero photo responsive and avoid overlap with next section */
@media (max-width: 640px) {
  .hero { padding: 16px 0 28px; margin-top: 0; }
  .hero-grid { gap: 16px; }
  .hero h1 { font-size: 32px; }
  .hero-photo {
    width: min(56vw, 220px);
    max-width: 220px;
    height: auto;
    aspect-ratio: 4 / 5;
    object-fit: cover;
    transform: none;
    margin: 0 auto;
  }
  .home-summary { margin-top: 0; }
}

/* Responsive timeline adjustments */
@media (max-width: 640px) {
  .timeline::before { left: 10px; }
  .timeline > li { grid-template-columns: 1fr; padding-left: 28px; column-gap: 8px; margin: 12px 0; }
  .timeline > li::before { left: 2px; }
  .timeline .time-list { margin-bottom: 4px; }
  #pub-list .time-list,
  #pub-list .item-body { top: 0; }
  .timeline .item-list li { margin: 8px 0; }
  .pub-title { font-size: 15px; }
  .summary-text { font-size: 16px; }
  .pub-actions { display: flex; gap: 4px; margin-top: 6px; }
  .pub-actions .btn { height: 26px; font-size: 12px; padding: 0 10px; }
}

/* Ensure pub-list offsets are reset on small screens */
@media (max-width: 640px) {
  #pub-list .time-list,
  #pub-list .item-body { top: 0 !important; }
}

.home-summary { margin-top: 0; margin-bottom: 24px;}
.summary-inner { display: grid; gap: 24px; justify-items: start; }
.summary-text { max-width: 70ch; color: var(--muted); font-size: 18px; text-align: justify; }
.summary-text a, .prose a, .timeline a, #hero-tagline a {
  text-decoration: none;
}
.chips { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 24px;}
.chips .chip { padding: 6px 10px; border-radius: 999px; border: 1px solid var(--border); color: var(--text); background: color-mix(in srgb, var(--bg) 88%, transparent); }
/* Education list styling */
.edu-list { list-style: none; padding-left: 0; display: grid; gap: 8px; margin: 6px 0 0; }
.edu-list li { display: grid; grid-template-columns: 10px 1fr; align-items: start; gap: 10px; }
.edu-list .edu-bullet { width: 6px; height: 6px; border-radius: 999px; background: var(--accent); margin-top: 10px; display: inline-block; }
.edu-item { display: grid; gap: 2px; }
.edu-years { font-weight: 600; color: var(--accent-ink); line-height: 1.3; }
.edu-text { color: var(--text); }

.content { padding: 32px 0 64px; }
.prose p { margin: 0 0 12px; }
.pub-list { padding-left: 20px; }
.project-list { padding-left: 18px; }
.contact-list { list-style: none; padding: 0; margin: 0; }
.contact-list li { margin: 8px 0; }
.contact-list .icon { width: 18px; height: 18px; vertical-align: text-bottom; margin-right: 6px; }

.cv-embed object { border: 1px solid var(--border); border-radius: 12px; }

.site-footer { border-top: 1px solid var(--border); }
.footer-inner { padding: 18px 0; color: var(--muted); font-size: 14px; }

/* Featured cards */
.home-featured { padding: 8px 0 56px; }
.home-featured-inline { width: 100%; }
.section-title { font-size: 22px; margin: 0 0 14px; }
.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
@media (max-width: 980px) { .cards-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .cards-grid { grid-template-columns: 1fr; } }
.card {
  display: flex;
  flex-direction: column;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  transition: transform 120ms ease, box-shadow 120ms ease, border-color 120ms ease;
  color: inherit;
  text-decoration: none;
}
.card:hover { transform: translateY(-2px); box-shadow: 0 8px 24px color-mix(in srgb, var(--text) 8%, transparent); border-color: color-mix(in srgb, var(--border) 60%, var(--accent)); }
.card-media { aspect-ratio: 16 / 9; background: linear-gradient(135deg, #dfe7ef, #c7d2dc); position: relative; }
.card-media img { width: 100%; height: 100%; object-fit: cover; display: block; }
.card-body { padding: 12px 14px 14px; display: grid; gap: 8px; }
.card-kicker { font-size: 12px; color: var(--muted); }
.card-title { font-weight: 600; line-height: 1.3; margin: 0; font-size: 16px; }
.card-title { text-decoration: none; }
.card-source { color: var(--muted); font-size: 13px; }

/* Timeline (vertical line + lollipop) */
.timeline {
  list-style: none;
  padding-left: 0;
  margin: 0;
  position: relative;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: color-mix(in srgb, var(--accent) 35%, var(--border));
}
.timeline > li {
  position: relative;
  padding-left: 56px; /* left rail gap */
  margin: 16px 0;
  line-height: 1.6;
  display: grid;
  grid-template-columns: 160px 1fr; /* slimmer time column, more room for content */
  column-gap: 14px; /* moderate gap between time and content */
  align-items: baseline;
}
.timeline > li::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 0.44em; /* fine-tune alignment with time badge baseline */
  width: 16px;
  height: 16px;
  background: var(--bg);
  border: 3px solid var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 0 2px var(--bg);
}

/* Time badge and subtle hover animation */
.timeline .time {
  display: inline-block;
  padding: 1px 6px;
  margin-right: 8px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 12%, var(--bg));
  color: var(--accent-ink);
  transition: transform 120ms ease, background-color 120ms ease, box-shadow 120ms ease;
  vertical-align: middle;
}
.timeline .time-list { display: flex; flex-wrap: wrap; gap: 6px; }
.timeline .item-body { min-width: 0; }
.timeline .item-list { margin: 0; padding-left: 0; }
.timeline .item-list li { margin: 6px 0; }
#pub-list .item-list li { margin: 16px 0; }

/* Nudge publications' year labels and lists up to align with lollipops */
#pub-list .time-list,
#pub-list .item-body {
  position: relative;
  top: -10px;
}
#projects-list .item-list { list-style: none; }
.timeline > li:hover .time {
  transform: translateY(-1px);
  background: color-mix(in srgb, var(--accent) 20%, var(--bg));
  box-shadow: 0 3px 10px color-mix(in srgb, var(--accent) 18%, transparent);
}

/* Mobile flat timeline */
@media (max-width: 640px) {
  .timeline-mobile { position: relative; padding-left: 0; }
  .timeline-mobile::before { display: none; }
  .timeline-mobile > .mobile-item { list-style: none; margin: 10px 0; padding: 10px 12px; border: 1px solid var(--border); border-radius: 10px; background: color-mix(in srgb, var(--bg) 96%, transparent); }
  .timeline-mobile > .mobile-item .time { display: inline-block; margin: 0 8px 6px 0; }
  .timeline-mobile > .mobile-item .mobile-item-body { display: block; }
  /* Tighter, button-group-like actions for mobile cards */
  .timeline-mobile .pub-actions { gap: 0; flex-wrap: wrap; }
  .timeline-mobile .pub-actions .btn { height: 24px; font-size: 12px; padding: 0 8px; border-width: 1px; }
  .timeline-mobile .pub-actions .btn + .btn { margin-left: -1px; }
}

/* Publication action buttons */
.pub-actions {
  display: inline-flex;
  flex-direction: row;
  align-items: center;
  flex-wrap: wrap;
  gap: 2px; /* small positive gap to avoid overlap issues on hover */
  margin-top: 4px;
}
/* Ensure hovered button stays on top if elements get tight */
.pub-actions .btn { position: relative; z-index: 0; }
.pub-actions .btn:hover { z-index: 2; }
.pub-title { font-weight: 700; line-height: 1.35; margin-bottom: 2px; }
.pub-authors { color: var(--text); line-height: 1.5; }
.pub-meta { color: var(--muted); position: relative; top: 1px; }
.pub-metrics { display: flex; align-items: center; gap: 8px; margin-top: 0; }
.pub-metrics-inline {
  display: inline-flex;
  align-items: center; /* valid value; 'top' is invalid */
  gap: 4px;
  margin-left: 20px;
  margin-top: -2px; /* subtle nudge without breaking layout */
  height: var(--metrics-height);
  line-height: var(--metrics-height);
  transform: none;
  vertical-align: middle;
}
/* Make Altmetric bar look like compact rectangular badge without distortion */
.pub-metrics-inline .altmetric-embed { display: inline-flex; align-items: center; height: var(--metrics-height); }
.pub-metrics-inline .altmetric-bar { height: var(--metrics-height); width: auto; display: inline-block; vertical-align: middle; }
.pub-metrics-inline .__dimensions_Badge_Container,
.pub-metrics-inline .__dimensions_badge_embed__ {
  height: var(--metrics-height) !important;
  display: inline-flex;
  align-items: center;
  overflow: hidden;
  vertical-align: middle;
  position: relative;
  top: 1px;
}
/* Scale Dimensions badge (default ~18px high) to match --metrics-height */
.pub-metrics-inline .__dimensions_Badge_Container iframe,
.pub-metrics-inline .__dimensions_Badge_Container svg,
.pub-metrics-inline .__dimensions_Badge_Container img {
  transform: scale(1.06); /* ~19/18 to match --metrics-height */
  transform-origin: left center;
}
/* Ensure any images inside metrics align visually */
.pub-metrics-inline img { vertical-align: middle; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: var(--btn-height);
  padding: 0 10px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 12px;
  line-height: 1;
  text-decoration: none;
  border: 1px solid transparent;
  min-width: auto;
}
.btn:hover, .btn:focus-visible {
  filter: brightness(0.95);
  opacity: 1 !important;
}
.btn-outline {
  color: #0B63CE;
  border-color: #0B63CE;
  background: transparent;
}
.btn-solid {
  background: #0B63CE;
  border-color: #0B63CE;
  color: #ffffff;
}
.btn[aria-disabled="true"], .btn.disabled {
  opacity: 0.6;
  pointer-events: none;
}

/* Emphasis for primary author in publications */
.pub-author-me { font-weight: 700; }

/* Final mobile overrides (placed at end to ensure they win specificity/order) */
@media (max-width: 640px) {
  .hero { padding: 18px 0 34px; }
  .hero-photo { transform: none !important; margin: 6px auto 0 !important; }
  .home-summary { margin-top: 0 !important; }

  .timeline::before { left: 10px; }
  .timeline > li { grid-template-columns: 1fr !important; padding-left: 32px !important; column-gap: 8px !important; margin: 12px 0; }
  .timeline > li::before { left: 2px; }
  .timeline .time-list { margin-bottom: 6px; }
  .timeline .item-list li { margin: 10px 0; }
}