:root {
  --lime: #cedf00;
  --lime-soft: #eff4c8;
  --black: #1c1a1a;
  --black-2: #2a2727;
  --text: #2b2929;
  --muted: #625f5c;
  --line: #e7e6e0;
  --bg: #f6f6f2;
  --card: #ffffff;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(28, 26, 26, .05), 0 4px 16px rgba(28, 26, 26, .05);
  --shadow-hover: 0 2px 4px rgba(28, 26, 26, .06), 0 10px 28px rgba(28, 26, 26, .09);
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
main { flex: 1 0 auto; }
.wrap { max-width: 72rem; margin: 0 auto; padding: 0 1rem; }
@media (min-width: 48rem) { .wrap { padding: 0 2rem; } }

.skip-link {
  position: absolute; left: -999px; top: 0; z-index: 10;
  background: var(--black); color: #fff; padding: .5rem 1rem;
}
.skip-link:focus { left: 0; }
.sr-only {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}
:focus-visible { outline: 3px solid var(--lime); outline-offset: 2px; border-radius: 4px; }

a { color: var(--black); text-decoration-color: rgba(28, 26, 26, .35); text-underline-offset: 3px; }
a:hover { text-decoration-color: var(--black); }

/* Header */
.site-header { background: #fff; border-bottom: 1px solid var(--line); }
.header-row {
  display: flex; align-items: center; flex-wrap: wrap;
  column-gap: 1.5rem; row-gap: .5rem; padding-top: .9rem; padding-bottom: .9rem;
}
.logo-link { display: block; flex: 1 1 0; max-width: 300px; min-width: 0; margin-right: auto; }
.logo-link img { display: block; width: 100%; height: auto; }
.site-nav { display: flex; gap: .25rem; }
.site-nav a {
  padding: .4rem .75rem; border-radius: 999px;
  font-size: .92rem; font-weight: 600; color: var(--muted); text-decoration: none;
}
.site-nav a:hover { color: var(--black); background: var(--bg); }
.site-nav a[aria-current="page"] { color: var(--black); background: var(--lime-soft); }
.header-button { flex: none; display: inline-block; }
.header-button .short { display: none; }
@media (max-width: 48rem) {
  .site-nav { order: 3; width: 100%; margin-left: -.75rem; }
}
@media (max-width: 34rem) {
  .header-button .long { display: none; }
  .header-button .short { display: inline; }
}

/* Buttons */
.button {
  display: inline-flex; align-items: center; justify-content: center;
  padding: .5rem 1rem; border-radius: 999px;
  font-size: .9rem; font-weight: 600; line-height: 1.3;
  text-decoration: none; white-space: nowrap;
  transition: background-color .15s ease, color .15s ease, border-color .15s ease;
}
.button-dark { background: var(--black); color: #fff; border: 1px solid var(--black); }
.button-dark:hover { background: var(--black-2); color: var(--lime); }
.button-outline { background: transparent; color: var(--black); border: 1px solid #cfcdc6; }
.button-outline:hover { border-color: var(--black); }

/* Hero */
.hero { background: var(--black); color: #e8e7e3; padding: 3rem 0 2.5rem; }
.eyebrow {
  margin: 0 0 .5rem; font-size: .8rem; font-weight: 600;
  letter-spacing: .08em; text-transform: uppercase; color: var(--lime);
}
.hero h1 {
  margin: 0 0 1rem; color: #fff;
  font-size: clamp(2rem, 5vw, 2.75rem); line-height: 1.15; letter-spacing: -.01em;
}
.lead { margin: 0; max-width: 46rem; font-size: 1.08rem; color: #d3d1cc; }

.controls { display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 2rem; }
.controls[hidden] { display: none; }
.field { display: flex; flex-direction: column; gap: .35rem; }
.field-search { flex: 1 1 18rem; max-width: 28rem; }
.field label { font-size: .85rem; font-weight: 600; color: #bdbbb5; }
input[type="search"], select {
  font: inherit; font-size: .95rem; color: var(--text);
  padding: .6rem .85rem; min-width: 12rem;
  background: #fff; border: 1px solid transparent; border-radius: 10px;
}
input[type="search"]::placeholder { color: #8a8782; }
input[type="search"]:focus, select:focus { outline: 3px solid var(--lime); outline-offset: 0; }

/* Tool list */
.tools { padding: 2.5rem 0 3.5rem; }
.tools-head { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; flex-wrap: wrap; margin-bottom: 1.25rem; }
.tools h2 { margin: 0; font-size: 1.4rem; letter-spacing: -.01em; }
.count { margin: 0; color: var(--muted); font-size: .9rem; }

.grid {
  list-style: none; margin: 0; padding: 0;
  display: grid; gap: 1.25rem;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 21rem), 1fr));
}
.card {
  display: flex; flex-direction: column;
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: box-shadow .2s ease, transform .2s ease;
}
.card:hover { box-shadow: var(--shadow-hover); }
.card[hidden] { display: none; }
.card-body { padding: 1.25rem 1.35rem 1rem; flex: 1; }
.card h3 { margin: .6rem 0 .4rem; font-size: 1.15rem; line-height: 1.3; }
.description { margin: 0; color: var(--muted); font-size: .95rem; }

.meta { display: flex; gap: .4rem; flex-wrap: wrap; margin: 0; }
.tag {
  display: inline-block; padding: .15rem .65rem; border-radius: 999px;
  font-size: .75rem; font-weight: 600; letter-spacing: .02em;
  background: var(--lime-soft); color: #3d4200;
}
.tag-soon { background: var(--black); color: #fff; }

.card h4 {
  margin: 1.1rem 0 .4rem; font-size: .72rem; font-weight: 600;
  letter-spacing: .08em; text-transform: uppercase; color: var(--muted);
}
.papers { list-style: none; margin: 0; padding: 0; font-size: .9rem; }
.papers li + li { margin-top: .45rem; }
.paper-label { font-weight: 600; }
.kind {
  margin-left: .25rem; font-size: .75rem; color: var(--muted);
}
.doi { display: block; font-size: .8rem; color: var(--muted); overflow-wrap: anywhere; }
.doi a { color: var(--muted); }

.card-foot {
  display: flex; flex-wrap: wrap; align-items: center; gap: .5rem;
  padding: .9rem 1.35rem 1.1rem; border-top: 1px solid var(--line);
}

/* Facts, citations */
.facts { margin: .9rem 0 0; font-size: .88rem; }
.facts div { display: flex; gap: .5rem; }
.facts div + div { margin-top: .15rem; }
.facts dt { flex: none; width: 6.5rem; color: var(--muted); }
.facts dd { margin: 0; }
.cite { margin-top: .3rem; font-size: .82rem; }
.cite summary {
  cursor: pointer; width: fit-content; color: var(--muted);
  list-style-position: inside; border-radius: 4px;
}
.cite summary:hover { color: var(--black); }
.cite[open] { padding: .6rem .75rem; background: var(--bg); border-radius: 10px; }
.cite-text { margin: .4rem 0 .5rem; color: var(--text); overflow-wrap: anywhere; }
.copy-button {
  font: inherit; font-size: .8rem; font-weight: 600; cursor: pointer;
  padding: .3rem .8rem; border-radius: 999px;
  background: #fff; color: var(--black); border: 1px solid #cfcdc6;
}
.copy-button:hover { border-color: var(--black); }

/* Smaller hero for inner pages */
.hero-small { padding: 2.5rem 0 2.25rem; }

/* Contributors */
.people-section, .prose-section { padding: 2.5rem 0 3.5rem; }
.people { list-style: none; margin: 0; padding: 0; display: grid; gap: 1rem; }
.person {
  display: flex; align-items: center; flex-wrap: wrap; gap: 1rem 1.25rem;
  padding: 1.25rem 1.35rem; background: var(--card);
  border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow);
}
.person:target { outline: 3px solid var(--lime); outline-offset: 2px; }
.avatar {
  flex: none; width: 72px; height: 72px; border-radius: 50%; overflow: hidden;
  display: grid; place-items: center;
  background: var(--lime-soft); color: #3d4200; font-weight: 700; font-size: 1.4rem;
}
.avatar img { width: 100%; height: 100%; object-fit: cover; }
.person-body { flex: 1 1 16rem; min-width: 0; }
.person h2 { margin: 0; font-size: 1.15rem; line-height: 1.3; }
.person-meta { margin: .15rem 0 0; color: var(--muted); font-size: .92rem; }
.person-tools { display: flex; flex-wrap: wrap; gap: .35rem; margin: .6rem 0 0; }
.chip {
  display: inline-block; padding: .15rem .65rem; border-radius: 999px;
  font-size: .78rem; font-weight: 600; text-decoration: none;
  background: var(--bg); color: var(--black); border: 1px solid var(--line);
}
.chip:hover { border-color: var(--black); }
.person-links { display: flex; flex-wrap: wrap; gap: .5rem; margin: 0; }
.note { margin: 2rem 0 0; color: var(--muted); font-size: .92rem; }
code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: .88em;
  padding: .1rem .35rem; background: #ecebe5; border-radius: 4px;
}

/* About */
.prose { max-width: 46rem; }
.prose h2 { margin: 2rem 0 .5rem; font-size: 1.25rem; }
.prose h2:first-child { margin-top: 0; }
.prose p { margin: 0 0 1rem; }

/* Footer */
.site-footer { background: var(--black); color: #bdbbb5; padding: 1.75rem 0; }
.footer-row { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem 2rem; }
.site-footer p { margin: 0; max-width: 46rem; font-size: .85rem; }
.site-footer a { color: #e8e7e3; text-decoration-color: rgba(232, 231, 227, .4); }
.site-footer a:hover { color: var(--lime); }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}