:root {
  --bg: #fbfaf8;
  --surface: #ffffff;
  --text: #1d1d1f;
  --muted: #5f6368;
  --border: #e6e3de;
  --accent: #1f5fbf;
  --accent-soft: #e8effa;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color-scheme: light;
}

/* Dark is the default theme; the header button switches to light and remembers the choice. */
:root[data-theme="dark"] {
  --bg: #121316;
  --surface: #1a1c20;
  --text: #e8e8ea;
  --muted: #9aa0a6;
  --border: #2c2f35;
  --accent: #7fb0ff;
  --accent-soft: #1d2a40;
  color-scheme: dark;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 4.5rem; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.wrap {
  max-width: 64rem;
  margin: 0 auto;
  padding-inline: 1.25rem;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  padding-block: 0.85rem;
}

.brand { display: inline-flex; align-items: center; font-family: var(--serif); font-weight: 600; font-size: 1.15rem; color: var(--text); }

/* Small photo next to the name, shown once the big photo scrolls away. */
.brand-avatar {
  width: 0;
  height: 1.9rem;
  margin-right: 0;
  border-radius: 50%;
  object-fit: cover;
  opacity: 0;
  transition: width 0.25s, margin-right 0.25s, opacity 0.25s;
}
.scrolled .brand-avatar { width: 1.9rem; margin-right: 0.55rem; opacity: 1; }
.brand:hover { text-decoration: none; }

.nav ul { display: flex; flex-wrap: wrap; gap: 1.25rem; margin: 0; padding: 0; list-style: none; }
.nav ul a { color: var(--muted); font-size: 0.93rem; }
.nav ul a:hover { color: var(--text); text-decoration: none; }

/* Light/dark toggle: sun in dark mode (switch to light), moon in light mode. */
.nav ul { margin-left: auto; }
.theme-toggle {
  display: grid;
  place-items: center;
  width: 2.1rem;
  height: 2.1rem;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--surface);
  color: var(--muted);
  cursor: pointer;
}
.theme-toggle:hover { color: var(--text); border-color: var(--muted); }
.theme-toggle svg {
  width: 1.05rem;
  height: 1.05rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.theme-toggle .icon-moon { display: none; }
[data-theme="light"] .theme-toggle .icon-sun { display: none; }
[data-theme="light"] .theme-toggle .icon-moon { display: block; }

/* Hero */
.hero {
  display: grid;
  grid-template-columns: 9rem 1fr;
  gap: 2.5rem;
  padding-block: 3.5rem 1rem;
}

.avatar {
  width: 9rem;
  height: 9rem;
  border-radius: 50%;
  object-fit: cover;
  display: grid;
  place-items: center;
  background: var(--accent-soft);
  color: var(--accent);
  font: 600 2.5rem var(--serif);
}

h1, h2, h3 { font-family: var(--serif); font-weight: 600; line-height: 1.25; }

h1 { font-size: 2.4rem; margin: 0 0 0.25rem; }

.role { color: var(--muted); margin-top: 0; }


/* Small organization logos on white tiles, so dark logos stay visible in dark mode. */
.logo {
  width: 1.35em;
  height: 1.35em;
  margin-right: 0.45em;
  padding: 0.08em;
  vertical-align: -0.3em;
  border-radius: 22%;
  background: #fff;
  object-fit: contain;
}

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0;
  margin: 1.25rem 0;
  list-style: none;
}

.links a {
  display: inline-block;
  padding: 0.3rem 0.8rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
  font-size: 0.88rem;
}
.links a:hover { border-color: var(--accent); text-decoration: none; }


.interests { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.interests span {
  font-size: 0.8rem;
  padding: 0.15rem 0.6rem;
  border-radius: 4px;
  background: var(--accent-soft);
  color: var(--accent);
}

/* Sections */
section { padding-block: 1.5rem; }

h2 {
  font-size: 1.5rem;
  margin: 0 0 1rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
}

.timeline { list-style: none; padding: 0; margin: 0; }
.timeline li {
  display: grid;
  grid-template-columns: 6.5rem 1fr;
  gap: 1rem;
  padding-block: 0.35rem;
}
.timeline time { color: var(--muted); font-variant-numeric: tabular-nums; }

/* News: a short scrolling box (height set in JS to fit three items). */
.news-scroll {
  position: relative;
  max-height: 8.5rem;
  overflow-y: auto;
  overscroll-behavior: contain;
  padding-right: 0.5rem;
  scrollbar-width: thin;
  -webkit-mask-image: linear-gradient(to bottom, #000 calc(100% - 2.25rem), transparent);
  mask-image: linear-gradient(to bottom, #000 calc(100% - 2.25rem), transparent);
}
.news-scroll.at-end { -webkit-mask-image: none; mask-image: none; }
.news-scroll:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; border-radius: 4px; }
.news-more {
  margin-top: 0.35rem;
  padding: 0;
  border: 0;
  background: none;
  color: var(--accent);
  font: inherit;
  font-size: 0.85rem;
  cursor: pointer;
}
.news-more:hover { text-decoration: underline; }

/* Publications */
.pub {
  display: grid;
  grid-template-columns: 13rem 1fr;
  gap: 1.5rem;
  padding-block: 1.1rem;
  border-bottom: 1px solid var(--border);
}
.pub:last-child { border-bottom: 0; }

.pub-side { display: flex; flex-direction: column; gap: 0.6rem; }

.pub-video {
  display: grid;
  place-items: center;
  width: 100%;
  aspect-ratio: 16 / 10;
  overflow: hidden;
  border-radius: 6px;
  background: #000;
}
.pub-video video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}
/* Two videos side by side in one frame, e.g. baseline vs. ours. */
.pub-compare {
  grid-auto-flow: column;
  grid-auto-columns: 1fr;
  place-items: stretch;
  gap: 2px;
}
.pub-compare figure {
  position: relative;
  margin: 0;
  overflow: hidden;
}
.pub-compare video,
.pub-compare img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 50% 35%;
}
.pub-compare img { object-position: center; }
.pub-compare figcaption {
  white-space: nowrap;
  position: absolute;
  left: 4px;
  bottom: 4px;
  padding: 0 0.3rem;
  border-radius: 3px;
  background: rgba(0, 0, 0, 0.6);
  color: #fff;
  font-size: 0.65rem;
  font-weight: 500;
}
/* Hide title text baked into the top of a video, then re-center what is left. */
.pub-video video.crop {
  height: auto;
  clip-path: inset(var(--top) 0 var(--bottom) 0);
  transform: translateY(calc((var(--bottom) - var(--top)) / 2)) scale(var(--zoom, 1));
}

.pub-venue {
  align-self: start;
  justify-self: start;
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.25rem 0.62rem;
  border-radius: 4px;
  background: var(--accent-soft);
  color: var(--accent);
}

.pub h3 { font-size: 1.1rem; margin: 0 0 0.3rem; }
.pub p { margin: 0.25rem 0; }
.authors { color: var(--muted); font-size: 0.93rem; }
.authors b { color: var(--text); font-weight: 600; }
.summary { font-size: 0.93rem; }

.pub p.context {
  display: inline-block;
  margin: 0.15rem 0 0.35rem;
  padding: 0.05rem 0.5rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 500;
}

.pub p.soon { color: var(--muted); font-size: 0.88rem; font-style: italic; }

.pub-links { display: flex; flex-wrap: wrap; gap: 0.9rem; font-size: 0.88rem; font-weight: 500; }
.pub-links a::before { content: "["; color: var(--muted); }
.pub-links a::after { content: "]"; color: var(--muted); }

.badge {
  display: block;
  width: fit-content;
  margin-top: 0.3rem;
  padding: 0.1rem 0.45rem;
  border-radius: 4px;
  background: #f6e7b8;
  color: #6b4e00;
  font-size: 0.72rem;
}
[data-theme="dark"] .badge { background: #4a3c12; color: #f3d98a; }

.subhead { font-size: 1.05rem; color: var(--muted); margin: 1.5rem 0 0; }

.muted { color: var(--muted); margin-top: 0; }

/* Experience */
.entry { padding-block: 0.6rem; }
.entry-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
}
.entry h3 { font-size: 1.05rem; margin: 0; }
.entry time { color: var(--muted); font-size: 0.9rem; white-space: nowrap; }
.entry ul, .bullets { margin: 0.4rem 0 0; padding-left: 1.2rem; }
.entry li, .bullets li { margin-block: 0.25rem; }
#activities .bullets > li { margin-block: 1.1rem; }
#activities .bullets > li:first-child { margin-top: 0.4rem; }

/* Projects */
.project-top {
  display: grid;
  grid-template-columns: 7fr 5fr;
  gap: 1.75rem;
  align-items: center;
}

.project-hero { position: relative; }

.hero-caption {
  position: absolute;
  left: 0.75rem;
  bottom: 0.75rem;
  max-width: calc(100% - 1.5rem);
  margin: 0;
  padding: 0.35rem 0.7rem;
  border-radius: 6px;
  background: rgba(0, 0, 0, 0.62);
  backdrop-filter: blur(4px);
  color: #fff;
  font-size: 0.85rem;
  line-height: 1.4;
}
.nowrap { white-space: nowrap; }

.project-hero video {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: 8px;
  background: #000;
}

.project-text, .project-tile p { text-wrap: pretty; }
.project-text h3 { font-size: 1.2rem; margin: 0 0 0.3rem; }
.project-meta { color: var(--muted); font-size: 0.9rem; margin: 0 0 0.75rem; }
.project-meta strong { color: var(--text); font-weight: 600; }
.project-text p { margin: 0.5rem 0; font-size: 0.95rem; }
.project-text .bullets { font-size: 0.9rem; }
.project-text .bullets li { margin-block: 0.2rem; }

.project + .project {
  margin-top: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.highlight-note {
  padding: 0.45rem 0.7rem;
  border-left: 3px solid #d9a400;
  border-radius: 4px;
  background: #fbf1cf;
  color: #4d3a00;
  font-size: 0.9rem !important;
}
.highlight-note strong { color: #3a2b00; }
[data-theme="dark"] .highlight-note { background: #3a3015; color: #f3dfa0; border-left-color: #c99a1a; }
[data-theme="dark"] .highlight-note strong { color: #fff1c4; }

.project-note { color: var(--muted); font-size: 0.85rem !important; font-style: italic; }

.project-gallery {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-top: 1.5rem;
}

.project-tile p {
  margin: 0.5rem 0 0;
  font-size: 0.85rem;
  color: var(--muted);
}
.project-tile p strong { color: var(--text); }
.project-tile p a { margin-left: 0.25rem; white-space: nowrap; }

@media (max-width: 900px) {
  .project-gallery { grid-template-columns: 1fr 1fr; }
}

/* Photos beside Experience and Honors entries; click opens full size. */
.entry-body,
.li-media {
  display: grid;
  grid-template-columns: 1fr 10rem;
  gap: 1.25rem;
  align-items: start;
}
.li-text p { margin: 0; }
.li-text p + p { margin-top: 0.6rem; }
.li-text .judges { margin: 0.3rem 0 0; padding-left: 1.2rem; list-style: circle; }
.li-text .judges li { margin-block: 0.15rem; }
.entry-figure { margin: 0.4rem 0 0; }
.entry-figure img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid var(--border);
  border-radius: 6px;
}
/* Cutout images (transparent background): no frame, keep the natural shape. */
.entry-figure-plain img {
  width: auto;
  height: 9.5rem;
  margin-inline: auto;
  aspect-ratio: auto;
  object-fit: contain;
  border: 0;
  border-radius: 0;
}
.entry-figure figcaption {
  margin-top: 0.3rem;
  color: var(--muted);
  font-size: 0.78rem;
  text-align: center;
}

/* Experience timeline: logos sit on a vertical line, newest role first. */
.xp-timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}
.xp-timeline::before {
  content: "";
  position: absolute;
  top: 1.25rem;
  bottom: 1.25rem;
  left: 1.25rem;
  width: 2px;
  transform: translateX(-50%);
  background: var(--border);
}
.xp {
  position: relative;
  display: grid;
  grid-template-columns: 2.5rem 1fr auto;
  gap: 1.25rem;
  align-items: start;
  padding-block: 0.9rem;
}
.xp-marker {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 22%;
  background: #fff;
  box-shadow: 0 0 0 4px var(--bg);
}
.xp-marker img { width: 2.1rem; height: 2.1rem; object-fit: contain; }
/* Generic drone icon for a role without a logo, on the same white tile. */
.xp-marker-icon svg {
  width: 1.7rem;
  height: 1.7rem;
  fill: none;
  stroke: #5f6368;
  stroke-width: 1.6;
  stroke-linecap: round;
}
.xp-body time { color: var(--muted); font-size: 0.85rem; }
.xp-body h3 { margin: 0.1rem 0 0.15rem; font-size: 1.1rem; }
.xp-org { margin: 0; color: var(--muted); }
.xp-photo { width: 11rem; margin: 0; }
.xp-photo img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid var(--border);
  border-radius: 6px;
}
.xp-photo figcaption {
  margin-top: 0.3rem;
  color: var(--muted);
  font-size: 0.78rem;
  text-align: center;
}

/* Community: selected Stack Overflow answers. */
/* Community images: one row, same height; wraps on narrow screens. */
.so-gallery {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  align-items: flex-start;
  margin-top: 1rem;
}
.so-gallery figure { display: flex; flex-direction: column; align-items: center; margin: 0; }
.so-gallery img {
  display: block;
  height: 8.5rem;
  width: auto;
  border: 1px solid var(--border);
  border-radius: 6px;
}
.so-gallery .so-diagram { padding-inline: 1.6rem; background: #fff; }
.so-pair a { display: flex; gap: 0.4rem; }
.so-gallery figcaption {
  margin-top: 0.3rem;
  color: var(--muted);
  font-size: 0.78rem;
  text-align: center;
}
.so-gallery figcaption strong { color: var(--text); font-weight: 600; }
.so-years { color: var(--muted); font-size: 0.85rem; }
#community .bullets > li { margin-block: 1.1rem; }
#community .bullets > li:first-child { margin-top: 0.4rem; }
#community .bullets > li > p { margin: 0.3rem 0 0; }
#community .so-head { margin: 0; }
.so-label {
  margin: 1rem 0 0;
  color: var(--muted);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.so-answers { margin: 0.35rem 0 0; padding-left: 1.2rem; }
.so-answers li { margin-block: 0.3rem; }
.so-meta { color: var(--muted); font-size: 0.85rem; white-space: nowrap; }

/* Footer */
.footer {
  padding-block: 2rem 3rem;
  color: var(--muted);
  font-size: 0.85rem;
}

/* Mobile */
@media (max-width: 640px) {
  .so-gallery img { height: 6.5rem; }
  .xp { grid-template-columns: 2.5rem 1fr; gap: 0.9rem; }
  .xp-photo { grid-column: 2; width: 100%; max-width: 16rem; }
  .nav { flex-direction: column; align-items: flex-start; gap: 0.35rem; padding-block: 0.6rem; }
  .nav { position: relative; }
  .nav ul { margin-left: 0; }
  .theme-toggle { position: absolute; top: 0.45rem; right: 1.25rem; width: 1.9rem; height: 1.9rem; }
  .nav ul { width: 100%; flex-wrap: nowrap; justify-content: space-between; gap: 0.6rem; overflow-x: auto; }
  .nav ul a { font-size: 0.8rem; white-space: nowrap; }
  .entry-body, .li-media { grid-template-columns: 1fr; }
  .entry-figure { max-width: 16rem; }
  .project-top { grid-template-columns: 1fr; gap: 1rem; }
  .project-gallery { grid-template-columns: 1fr 1fr; }
  .hero { grid-template-columns: 1fr; gap: 1.5rem; padding-top: 2rem; }
  .avatar { width: 7rem; height: 7rem; font-size: 2rem; }
  h1 { font-size: 2rem; }
  .pub { grid-template-columns: 1fr; gap: 0.5rem; }
  .pub-video { max-width: 22rem; }
  .timeline li { grid-template-columns: 1fr; gap: 0; }
  .entry-head { flex-direction: column; gap: 0; }
}