:root {
  color-scheme: light dark;
  --bg: #f3f7f3;
  --panel: #ffffff;
  --ink: #142019;
  --muted: #56695d;
  --green: #22874c;
  --line: #d6e3d9;
  --code: #eaf1ec;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0a110d;
    --panel: #111b15;
    --ink: #e4efe7;
    --muted: #8ea898;
    --green: #4fd38a;
    --line: #1f3027;
    --code: #16231b;
  }
}
* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  line-height: 1.6;
}
a { color: var(--green); }
img { max-width: 100%; height: auto; }

/* home */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
  align-items: center;
  gap: 3rem;
  max-width: 68rem;
  margin: 0 auto;
  padding: 4rem 1.5rem 3rem;
}
.portrait {
  width: 100%;
  border-radius: 18px;
  box-shadow: 0 30px 70px -30px rgba(10, 60, 30, 0.6), 0 0 0 1px var(--line);
}
h1 {
  margin: 0;
  font-size: clamp(2.8rem, 8vw, 5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1;
}
h1 span, .brand span { color: var(--green); }
.lede { font-size: 1.2rem; color: var(--muted); margin: 1.25rem 0 1.75rem; max-width: 30rem; }
.links { display: flex; flex-wrap: wrap; gap: 0.75rem; margin: 0; }
.links a {
  padding: 0.55rem 1.1rem;
  border: 1px solid var(--green);
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
}
.links a:first-child { background: var(--green); color: var(--bg); }
main { max-width: 68rem; margin: 0 auto; padding: 1rem 1.5rem 3rem; }
h2 { font-size: 1.5rem; margin: 0 0 1rem; }
.notes {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(17rem, 1fr));
  gap: 0.9rem;
}
.notes a {
  display: block;
  height: 100%;
  padding: 1rem 1.15rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  text-decoration: none;
  color: var(--ink);
  transition: border-color 0.15s, transform 0.15s;
}
.notes a:hover, .notes a:focus-visible { border-color: var(--green); transform: translateY(-2px); outline: none; }
.notes strong { display: block; color: var(--green); margin-bottom: 0.2rem; }
.notes span { color: var(--muted); font-size: 0.92rem; }
footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
  padding: 2rem 1rem 3rem;
}
@media (max-width: 760px) {
  .hero { grid-template-columns: 1fr; gap: 1.75rem; padding-top: 1.5rem; text-align: center; }
  .portrait { max-width: 22rem; margin: 0 auto; display: block; }
  .lede { margin-left: auto; margin-right: auto; }
  .links { justify-content: center; }
}

/* founders */
.people {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(18rem, 1fr));
  gap: 1rem;
}
.people a {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-rows: auto auto;
  column-gap: 1rem;
  align-items: center;
  padding: 1.1rem 1.25rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  text-decoration: none;
  color: var(--ink);
  transition: border-color 0.15s, transform 0.15s;
}
.people a:hover, .people a:focus-visible { border-color: var(--green); transform: translateY(-2px); outline: none; }
.people .avatar { grid-row: 1 / 3; }
.people strong { font-size: 1.15rem; color: var(--green); align-self: end; }
.people span:not(.avatar) { color: var(--muted); font-size: 0.95rem; align-self: start; }
.avatar {
  display: inline-grid;
  place-items: center;
  width: 3.5rem;
  height: 3.5rem;
  border-radius: 50%;
  background: color-mix(in srgb, var(--green) 18%, var(--panel));
  border: 2px solid var(--green);
  color: var(--green);
  font-weight: 800;
  letter-spacing: 0.02em;
  object-fit: cover;
}
.avatar.big { width: 7.5rem; height: 7.5rem; font-size: 2.2rem; flex: none; }

/* a person's page */
.topbar.wide { max-width: 52rem; }
.profile {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  max-width: 52rem;
  margin: 0 auto;
  padding: 1.5rem 1.5rem 0.5rem;
}
.name { font-size: clamp(2.2rem, 7vw, 3.2rem); }
.role { color: var(--muted); margin: 0.5rem 0 1rem; font-size: 1.1rem; }
.profile ~ main { max-width: 52rem; }
.profile ~ main section { margin-top: 2.25rem; }
.prose p { font-size: 1.08rem; max-width: 42rem; }
.facts { padding-left: 1.2rem; margin: 0; }
.facts li { margin-bottom: 0.6rem; }
.aside { color: var(--muted); margin-top: 1.25rem; }
#notes .aside { margin: -0.5rem 0 1rem; }
.feature {
  padding: 1.5rem 1.5rem 1.75rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 4px solid var(--green);
  border-radius: 14px;
}
.feature h2 { margin-top: 0; color: var(--green); }
.feature p { max-width: 42rem; }
@media (max-width: 760px) {
  .profile { flex-direction: column; text-align: center; gap: 1rem; }
}

/* a note */
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 46rem;
  margin: 0 auto;
  padding: 1.25rem 1.5rem;
}
.brand { font-weight: 800; font-size: 1.25rem; color: var(--ink); text-decoration: none; letter-spacing: -0.02em; }
.doc {
  max-width: 46rem;
  margin: 0 auto;
  padding: 1.5rem 1.5rem 2rem;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 14px;
  overflow-wrap: anywhere;
}
@media (min-width: 760px) { .doc { padding: 2.5rem 3rem; } }
.doc h1 { font-size: clamp(1.8rem, 5vw, 2.4rem); line-height: 1.2; margin-bottom: 1rem; }
.doc h2 { margin-top: 2rem; }
.doc pre, .doc code { background: var(--code); border-radius: 6px; font-size: 0.9em; }
.doc code { padding: 0.1em 0.35em; }
.doc pre { padding: 0.9rem 1rem; overflow-x: auto; }
.doc pre code { padding: 0; background: none; }
.doc table { border-collapse: collapse; display: block; overflow-x: auto; }
.doc td, .doc th { border: 1px solid var(--line); padding: 0.4rem 0.6rem; vertical-align: top; }
.doc .katex-display { overflow-x: auto; overflow-y: hidden; }
.doc .mermaid { text-align: center; overflow-x: auto; }
.loading { color: var(--muted); }