:root {
  --bg: #fbfbfa;
  --text: #17171a;
  --muted: #6e6e73;
  --line: #e2e2df;
  --accent: #1f4fd8;
  --measure: 62ch;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121214;
    --text: #ececee;
    --muted: #91919a;
    --line: #2a2a2e;
    --accent: #8aa8ff;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  font-synthesis-weight: none;
}

.page {
  width: min(100% - 48px, 720px);
  margin: 0 auto;
  padding: clamp(32px, 5vh, 56px) 0 56px;
}

a {
  color: inherit;
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  text-decoration-color: var(--muted);
  transition: color 0.15s ease, text-decoration-color 0.15s ease;
}

a:hover {
  color: var(--accent);
  text-decoration-color: currentColor;
}

a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* Masthead */

.masthead {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 24px;
  flex-wrap: wrap;
  margin-bottom: clamp(26px, 4vh, 40px);
}

.wordmark {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: -0.01em;
  text-decoration: none;
}

.masthead nav {
  display: flex;
  gap: 20px;
  font-size: 15px;
  color: var(--muted);
}

.masthead nav a[aria-current="page"] {
  color: var(--text);
  text-decoration-color: var(--text);
}

/* Intro */

.intro {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 40px;
  align-items: start;
  margin-bottom: clamp(26px, 4.5vh, 42px);
}

h1 {
  margin: 0 0 16px;
  font-size: clamp(26px, 3.6vw, 33px);
  font-weight: 600;
  letter-spacing: -0.025em;
  line-height: 1.15;
}

.lede {
  margin: 0;
  max-width: 46ch;
  font-size: clamp(18px, 2.2vw, 20px);
  line-height: 1.5;
  color: var(--text);
}

.lede + .lede {
  margin-top: 14px;
  color: var(--muted);
  font-size: 17px;
}

.portrait {
  width: 132px;
  height: 132px;
  border-radius: 2px;
  object-fit: cover;
  filter: grayscale(1);
  opacity: 0.92;
}

/* Spine */

.spine {
  margin: 0 0 clamp(24px, 4vh, 36px);
  border-top: 1px solid var(--line);
}

.spine > div {
  display: grid;
  grid-template-columns: 108px 1fr;
  gap: 24px;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
}

.spine dt {
  color: var(--muted);
  font-size: 14px;
  letter-spacing: 0.01em;
  padding-top: 2px;
}

.spine dd {
  margin: 0;
  max-width: var(--measure);
}

.spine .role {
  font-weight: 560;
}

.spine .note {
  display: block;
  color: var(--muted);
  font-size: 15.5px;
  margin-top: 2px;
}

/* Link row */

.contact {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 28px;
  font-size: 16px;
}

/* Long-form pages */

.prose {
  max-width: var(--measure);
}

.prose p {
  margin: 0 0 20px;
}

h2 {
  margin: clamp(40px, 7vh, 64px) 0 20px;
  font-size: 20px;
  font-weight: 600;
  letter-spacing: -0.015em;
}

.list {
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: var(--measure);
}

.list > li {
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.list > li:first-child {
  border-top: 1px solid var(--line);
}

.meta {
  display: block;
  margin-top: 3px;
  color: var(--muted);
  font-size: 14.5px;
}

.topics {
  list-style: none;
  margin: 0;
  padding: 0;
  max-width: var(--measure);
  columns: 2;
  column-gap: 32px;
}

.topics li {
  break-inside: avoid;
  margin-bottom: 12px;
  font-size: 16px;
}

.copy-btn {
  margin-top: 10px;
  font: inherit;
  font-size: 14px;
  color: var(--muted);
  background: none;
  border: 1px solid var(--line);
  border-radius: 2px;
  padding: 5px 11px;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.copy-btn:hover {
  color: var(--text);
  border-color: var(--muted);
}

.copy-btn:active { transform: translateY(1px); }

footer {
  margin-top: clamp(48px, 9vh, 88px);
  padding-top: 20px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14.5px;
}

@media (max-width: 620px) {
  .intro {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .portrait { order: -1; width: 104px; height: 104px; }
  .spine > div { grid-template-columns: 1fr; gap: 4px; }
  .topics { columns: 1; }
}