:root {
  --bg: #ffffff;
  --ink: #17181c;
  --muted: #64656d;
  --faint: #74757d;   /* 4.58:1 on white — WCAG AA for small text */
  --rule: #e8e8ec;
  --wash: #f7f7f9;
  --accent: #3d4ea8;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: .975rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 2px; }

/* Off-screen until focused, so keyboard users can jump past the sidebar. */
.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 20;
  background: var(--accent); color: #fff;
  padding: .5rem 1rem; border-radius: 0 0 6px 0;
  font-size: .85rem;
}
.skip-link:focus { left: 0; text-decoration: none; }

p { margin: 0 0 1rem; }
p:last-child { margin-bottom: 0; }

.shell {
  max-width: 66rem; margin: 0 auto;
  display: grid; grid-template-columns: 15rem 1fr; gap: 4rem;
  padding: 0 2rem;
}

/* ---------- sidebar ---------- */

.side {
  position: sticky; top: 0; align-self: start;
  height: 100vh; padding: 3.5rem 0 2rem;
  display: flex; flex-direction: column; gap: 1.35rem;
}

.portrait { margin: 0; width: 6.5rem; }
.portrait img { width: 100%; height: auto; display: block; border-radius: 12px; }

.side h1, .side .name {
  font-size: 1.32rem; font-weight: 640; letter-spacing: -.02em;
  line-height: 1.25; margin: 0;
}
.side .name a { color: var(--ink); }
.side .name a:hover { color: var(--accent); text-decoration: none; }

.toc { display: flex; flex-direction: column; gap: .1rem; margin-top: .25rem; }
.toc a {
  font-size: .875rem; color: var(--muted);
  padding: .22rem 0 .22rem .85rem;
  border-left: 2px solid var(--rule);
  transition: color .15s, border-color .15s;
}
.toc a:hover { color: var(--ink); text-decoration: none; }
.toc a.active { color: var(--accent); border-left-color: var(--accent); font-weight: 550; }

.side .social { margin-top: auto; display: flex; gap: 1.1rem; }
.side .social a { color: var(--faint); display: inline-flex; }
.side .social a:hover { color: var(--accent); }
.side .social svg { width: 1.15rem; height: 1.15rem; fill: currentColor; }

.copy { font-size: .74rem; color: var(--faint); margin: 0; }

.back { font-size: .875rem; color: var(--muted); align-self: start; }
.back:hover { color: var(--accent); text-decoration: none; }

/* project sidebar: back link + this page's contents, no portrait or name */
.side--project { padding-top: 3.6rem; gap: 1.5rem; }
.side--project .toc { margin-top: 0; }

/* ---------- content ---------- */

.content { padding: 3.5rem 0 5rem; max-width: 41rem; min-width: 0; }

.content > section { padding-bottom: 3.25rem; }

/* Section label + a hairline running out to the right edge: reads as both a
   heading and a divider, so sections separate without heavy banding. */
h2 {
  font-size: .84rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: .12em; color: var(--muted);
  margin: 0 0 1.5rem;
  display: flex; align-items: center; gap: .85rem;
}
h2::after {
  content: ""; flex: 1 1 auto; height: 1px; background: var(--rule);
}

/* ---------- news ---------- */

.news { list-style: none; margin: 0; padding: 0; }
.news li { display: grid; grid-template-columns: 6.6rem 1fr; gap: 0 1.15rem; margin-bottom: .85rem; }
.news li:last-child { margin-bottom: 0; }
.news time {
  font-family: var(--mono); font-size: .79rem; color: var(--faint);
  padding-top: .3em; white-space: nowrap;
}
.news .item { margin: 0; }

/* ---------- publications ---------- */

.pubs { list-style: none; margin: 0; padding: 0; }

.pub {
  display: grid; grid-template-columns: 9.75rem 1fr; gap: 1.35rem;
  padding: 1.15rem; margin: 0 -1.15rem 1rem;
  border-radius: 10px;
  transition: background .15s;
}
.pub:hover { background: var(--wash); }

.thumb { margin: 0; }
.thumb img {
  width: 100%; height: auto; display: block;
  border-radius: 6px; box-shadow: 0 1px 3px rgba(20,20,40,.14);
}

.pub .title { font-size: 1.01rem; font-weight: 620; line-height: 1.4; margin: 0 0 .28rem; letter-spacing: -.012em; }
.pub .title a { color: var(--ink); }
.pub .title a:hover { color: var(--accent); text-decoration: none; }

.pub .authors { font-size: .87rem; color: var(--muted); margin: 0 0 .28rem; }

.pub .venue { font-size: .84rem; margin: 0 0 .75rem; color: var(--muted); }
.pub .venue strong { color: var(--ink); font-weight: 620; }
.pub .venue a { color: var(--faint); }

.links { margin: 0; display: flex; flex-wrap: wrap; gap: .4rem; }

.btn, .linklike {
  font-family: inherit; font-size: .8rem; line-height: 1.4;
  color: var(--muted); background: var(--wash);
  border: 1px solid transparent; border-radius: 999px;
  padding: .22rem .75rem; cursor: pointer; display: inline-block;
}
.btn:hover, .linklike:hover {
  color: var(--accent); border-color: var(--accent); background: #fff; text-decoration: none;
}

.abstract {
  display: none; grid-column: 1 / -1;
  margin-top: .9rem; padding-top: .9rem;
  border-top: 1px solid var(--rule);
  font-size: .875rem; line-height: 1.6; color: var(--muted);
}
.abstract.open { display: block; }
.abstract p { margin-bottom: .7rem; }
.abstract p:last-child { margin-bottom: 0; }

/* ---------- software ---------- */

.soft { display: grid; grid-template-columns: 12rem 1fr; gap: 1.35rem; margin-bottom: 1.75rem; align-items: center; }
.soft:last-child { margin-bottom: 0; }
.soft h3 { font-size: .95rem; font-weight: 620; margin: 0 0 .22rem; }
.soft p { font-size: .855rem; color: var(--muted); margin: 0; }
.soft figure { margin: 0; }
.soft img { width: 100%; height: auto; display: block; border-radius: 6px; }
.soft.narrow img { max-width: 17rem; }

/* ---------- project pages ---------- */

.ptitle { font-size: 1.85rem; font-weight: 660; letter-spacing: -.025em; line-height: 1.15; margin: 0 0 .7rem; }
.byline { font-size: .875rem; color: var(--muted); margin: 0 0 .25rem; }
.pvenue { font-size: .8rem; color: var(--faint); margin: 0 0 2rem; font-family: var(--mono); letter-spacing: .04em; }

article h2 {
  font-size: .84rem; font-weight: 600; text-transform: uppercase; letter-spacing: .12em;
  color: var(--muted); margin: 3rem 0 1.25rem;
}
article h3 { font-size: .95rem; font-weight: 620; margin: 1.75rem 0 .5rem; }

.btns { margin: 0 0 1.3rem; display: flex; flex-wrap: wrap; gap: .4rem; }
.tldr { color: var(--muted); }

.fig { margin: 1.85rem 0; }
.fig img, .fig video { max-width: 100%; height: auto; display: block; margin: 0 auto; border-radius: 6px; }
.fig.narrow img, .fig.narrow video { max-width: 70%; }
figcaption { font-size: .78rem; line-height: 1.55; color: var(--faint); margin-top: .7rem; }

ul { padding-left: 1.15rem; }
li { margin-bottom: .3rem; }

.videos { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin: 1.85rem 0; }
.videos iframe { width: 100%; border: 0; border-radius: 6px; }

/* click-to-play poster standing in for a YouTube embed */
.ytlite {
  position: relative; display: block; width: 100%; padding: 0;
  border: 0; border-radius: 6px; overflow: hidden;
  background: #000; cursor: pointer;
}
.ytlite img { width: 100%; height: 100%; object-fit: cover; display: block; }
.ytlite-play {
  position: absolute; inset: 0; margin: auto;
  width: 3.4rem; height: 2.4rem; border-radius: 10px;
  background: rgba(0, 0, 0, .62);
  transition: background .15s;
}
.ytlite-play::after {
  content: ""; position: absolute; inset: 0; margin: auto;
  width: 0; height: 0; border-style: solid;
  border-width: .48rem 0 .48rem .8rem;
  border-color: transparent transparent transparent #fff;
}
.ytlite:hover .ytlite-play { background: #c00; }
.ytlite:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }

.videos-note {
  font-size: .78rem; color: var(--faint); margin: -1.1rem 0 1.85rem;
}

pre {
  background: var(--wash); border-radius: 8px; padding: 1rem 1.1rem; overflow-x: auto;
  font-family: var(--mono); font-size: .76rem; line-height: 1.55;
}
code { font-family: var(--mono); }

/* ---------- 404 ---------- */

.nf { min-height: 100vh; display: flex; flex-direction: column; align-items: center;
      justify-content: center; gap: .4rem; text-align: center; padding: 2rem; }
.nf h1 { font-size: 4.5rem; letter-spacing: -.035em; margin: 0; }
.nf p { color: var(--muted); }

/* ---------- responsive ---------- */

@media (max-width: 860px) {
  .shell { grid-template-columns: 1fr; gap: 0; padding: 0 1.25rem; }
  .side {
    position: static; height: auto; padding: 2.5rem 0 1.5rem;
    border-bottom: 1px solid var(--rule);
    display: grid; grid-template-columns: auto 1fr; gap: .35rem 1.15rem;
    align-items: center;
  }
  .portrait { width: 4.25rem; grid-row: span 2; }
  .side h1, .side .name { align-self: end; }
  .toc { display: none; }
  .side .social { margin-top: 0; align-self: start; }
  .side .copy { display: none; }
  /* no portrait here, so drop the two-column arrangement entirely */
  .side--project {
    display: flex; flex-direction: row; align-items: center;
    justify-content: space-between; gap: 1rem; padding: 1.5rem 0;
  }
  .side--project .social { margin: 0; }
  .content { padding: 2.25rem 0 3rem; max-width: none; }
  .pub { grid-template-columns: 1fr; gap: .9rem; padding: 0; margin: 0 0 1.9rem; }
  .pub:hover { background: none; }
  .thumb { max-width: 13rem; }
  .news li { grid-template-columns: 1fr; gap: 0; margin-bottom: 1.15rem; }
  .news time { padding-top: 0; }
  .soft { grid-template-columns: 1fr; gap: .8rem; }
  .soft.narrow img { max-width: 100%; }
  .fig.narrow img, .fig.narrow video { max-width: 100%; }
  .videos { grid-template-columns: 1fr; }
  .ptitle { font-size: 1.5rem; }
}