@font-face {
  font-family: 'Geist Sans';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('../fonts/geist-sans-latin-400-normal.woff2') format('woff2');
}

@font-face {
  font-family: 'Geist Sans';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('../fonts/geist-sans-latin-500-normal.woff2') format('woff2');
}

@font-face {
  font-family: 'Geist Sans';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('../fonts/geist-sans-latin-700-normal.woff2') format('woff2');
}

@font-face {
  font-family: 'Geist Mono';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url('../fonts/geist-mono-latin-400-normal.woff2') format('woff2');
}

@font-face {
  font-family: 'Geist Mono';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url('../fonts/geist-mono-latin-500-normal.woff2') format('woff2');
}

@font-face {
  font-family: 'Geist Mono';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('../fonts/geist-mono-latin-700-normal.woff2') format('woff2');
}

:root {
  --bg: #fbfbfa;
  --surface: #ffffff;
  --ink: #202020;
  --muted: #5b5b5b;
  --line: #d9d9d4;
  --accent: #2f4f6f;
  --container: 900px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: 'Geist Sans', Arial, Helvetica, sans-serif;
  -webkit-font-smoothing: antialiased;
  font-size: 1rem;
  line-height: 1.7;
}

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

a:hover {
  text-decoration: underline;
}

img {
  display: block;
  max-width: 100%;
}

.page-shell {
  min-height: 100vh;
}

.site-main {
  padding-bottom: 4rem;
}

.container {
  width: min(calc(100% - 2rem), var(--container));
  margin: 0 auto;
}

.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}

.site-header__inner {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1.25rem;
  padding: 1.25rem 0;
}

.site-header__brand {
  font-family: 'Geist Mono', 'Courier New', Courier, monospace;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--ink);
}

.site-header__nav,
.site-footer__links,
.simple-list,
.list-stack,
.utility-links {
  list-style: none;
  padding: 0;
  margin: 0;
}

.site-header__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.site-header__link {
  color: var(--muted);
  font-family: 'Geist Mono', 'Courier New', Courier, monospace;
  font-size: 0.95rem;
}

.site-header__link.is-active {
  color: var(--ink);
  text-decoration: underline;
  text-underline-offset: 0.22rem;
}

.page-intro {
  padding-top: 3.5rem;
}

.intro-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 220px;
  gap: 2.5rem;
  align-items: start;
}

h1,
h2,
.list-item__title {
  font-family: 'Geist Mono', 'Courier New', Courier, monospace;
  color: var(--ink);
}

h1 {
  font-size: clamp(2.35rem, 6vw, 3.75rem);
  line-height: 1.05;
  font-weight: 700;
  margin: 0 0 1rem;
}

h2 {
  margin: 0;
  font-size: 2rem;
  font-weight: 700;
}

.page-intro__lede,
.prose,
.prose p,
.list-item__meta,
.site-footer__copy {
  color: var(--muted);
}

.prose p {
  margin: 0 0 1rem;
}

.intro-aside {
  display: grid;
  gap: 1.25rem;
}

.portrait {
  width: 100%;
  border: 1px solid var(--line);
}

.aside-heading {
  margin: 0;
  font-size: 0.95rem;
  font-family: 'Geist Mono', 'Courier New', Courier, monospace;
  font-weight: 700;
  color: var(--ink);
}

.simple-list {
  display: grid;
  gap: 0.45rem;
}

.simple-list li,
.list-item {
  padding-bottom: 0.8rem;
  border-bottom: 1px solid var(--line);
}

.content-block {
  max-width: 700px;
}

.research-section + .research-section {
  margin-top: 2.5rem;
}

.section-heading {
  margin-bottom: 0.9rem;
}

.list-stack {
  display: grid;
  gap: 1.15rem;
}

.list-item__title {
  margin: 0 0 0.2rem;
  font-size: 1.05rem;
  line-height: 1.3;
  font-weight: 700;
}

.list-item__meta {
  margin: 0.15rem 0;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.5rem 0 2rem;
}

.site-footer__inner {
  display: flex;
  justify-content: space-between;
  gap: 1.5rem;
}

.site-footer__copy {
  max-width: 58ch;
  margin: 0;
}

.site-footer__links,
.utility-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.utility-links {
  margin-top: 1rem;
}

@media (max-width: 760px) {
  .site-header__inner,
  .site-footer__inner {
    flex-direction: column;
    align-items: start;
  }

  .intro-grid {
    grid-template-columns: 1fr;
  }

  .intro-aside {
    max-width: 220px;
  }
}