:root {
  --paper: #edefea;
  --surface: #f8f9f6;
  --ink: #161a17;
  --muted: #5e6860;
  --accent: #1e5140;
  --accent-ink: #f8f9f6;
  --rule: #cbd3cc;
  --rule-soft: #dde2db;

  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --mono: ui-monospace, "Cascadia Mono", "SF Mono", "JetBrains Mono", Consolas, "Liberation Mono", monospace;

  --measure: 35rem;
  --rail: 9.5rem;
  --gutter: 2.5rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #0f1210;
    --surface: #171b18;
    --ink: #e4e8e2;
    --muted: #8e9a92;
    --accent: #74c4a0;
    --accent-ink: #0f1210;
    --rule: #2b322d;
    --rule-soft: #212622;
  }
}

:root[data-theme="dark"] {
  --paper: #0f1210;
  --surface: #171b18;
  --ink: #e4e8e2;
  --muted: #8e9a92;
  --accent: #74c4a0;
  --accent-ink: #0f1210;
  --rule: #2b322d;
  --rule-soft: #212622;
}

:root[data-theme="light"] {
  --paper: #edefea;
  --surface: #f8f9f6;
  --ink: #161a17;
  --muted: #5e6860;
  --accent: #1e5140;
  --accent-ink: #f8f9f6;
  --rule: #cbd3cc;
  --rule-soft: #dde2db;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 1.0625rem;
  line-height: 1.68;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.wrap {
  max-width: calc(var(--rail) + var(--gutter) + var(--measure) + 3rem);
  margin: 0 auto;
  padding: 0 1.5rem;
}

a {
  color: inherit;
  text-decoration-color: var(--accent);
  text-underline-offset: 0.18em;
  text-decoration-thickness: from-font;
}

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

a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 1px;
}

/* ---------- masthead ---------- */

.masthead {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
  padding: 2rem 0 1.25rem;
  border-bottom: 1px solid var(--rule);
}

.masthead .name {
  font-size: 1.0625rem;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.masthead nav {
  display: flex;
  gap: 1.5rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ---------- shared type ---------- */

.eyebrow {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 1.25rem;
}

h1 {
  font-size: clamp(2rem, 5.5vw, 2.7rem);
  line-height: 1.08;
  font-weight: 600;
  letter-spacing: -0.018em;
  text-wrap: balance;
  margin: 0 0 1.25rem;
}

h2 {
  font-size: 1.5rem;
  line-height: 1.24;
  font-weight: 600;
  letter-spacing: -0.012em;
  text-wrap: balance;
  margin: 0 0 1rem;
}

h3 {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-weight: 500;
  color: var(--muted);
  margin: 0 0 0.9rem;
}

p { margin: 0 0 1.15rem; }

.lede {
  font-size: 1.2rem;
  line-height: 1.56;
  color: var(--ink);
}

strong { font-weight: 600; }

code {
  font-family: var(--mono);
  font-size: 0.855em;
  background: var(--surface);
  border: 1px solid var(--rule-soft);
  border-radius: 2px;
  padding: 0.08em 0.32em;
}

/* ---------- landing ---------- */

.hero { padding: 4.5rem 0 3.25rem; }

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

.docmeta {
  display: grid;
  grid-template-columns: max-content minmax(0, 1fr);
  gap: 0.5rem 1.75rem;
  margin: 2.5rem 0 0;
  padding-top: 1.75rem;
  border-top: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.5;
  max-width: var(--measure);
}

.docmeta dt {
  color: var(--muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-size: 0.68rem;
  padding-top: 0.18em;
}

.docmeta dd { margin: 0; }

.block {
  padding: 3rem 0;
  border-top: 1px solid var(--rule);
}

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

.entry .title {
  font-size: 1.32rem;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin: 0 0 0.5rem;
  text-wrap: balance;
}

.entry .dek { color: var(--muted); margin: 0 0 0.85rem; }

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.5rem;
  padding: 0;
  margin: 0;
  list-style: none;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.tags li {
  border: 1px solid var(--rule);
  border-radius: 2px;
  padding: 0.16rem 0.45rem;
}

.linklist {
  display: grid;
  gap: 0.7rem;
  padding: 0;
  margin: 0;
  list-style: none;
  font-family: var(--mono);
  font-size: 0.83rem;
  max-width: var(--measure);
}

.linklist .label {
  display: inline-block;
  min-width: 5.5rem;
  color: var(--muted);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

/* ---------- essay ---------- */

.essayhead {
  display: grid;
  grid-template-columns: var(--rail) minmax(0, 1fr);
  gap: var(--gutter);
  padding: 4rem 0 2.5rem;
  border-bottom: 1px solid var(--rule);
}

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

.essayhead .lede { margin: 1.5rem 0 0; }

.sec {
  display: grid;
  grid-template-columns: var(--rail) minmax(0, 1fr);
  gap: var(--gutter);
  padding: 2.75rem 0;
  border-bottom: 1px solid var(--rule-soft);
}

.sec:last-of-type { border-bottom: 0; }

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

.rail {
  font-family: var(--mono);
  font-size: 0.68rem;
  line-height: 1.7;
  color: var(--muted);
  text-align: right;
}

.sec .rail {
  position: sticky;
  top: 2rem;
  align-self: start;
}

.rail .num {
  display: block;
  color: var(--accent);
  letter-spacing: 0.1em;
  font-size: 0.72rem;
  margin-bottom: 0.7rem;
}

.rail .src {
  display: block;
  border-top: 1px solid var(--rule);
  padding-top: 0.6rem;
  word-break: break-word;
}

.rail .src span { display: block; }

.pull {
  margin: 1.6rem 0;
  padding: 1.15rem 1.35rem;
  background: var(--surface);
  border-left: 2px solid var(--accent);
  font-size: 1.02rem;
}

.pull p:last-child { margin-bottom: 0; }

.sec ul, .sec ol {
  margin: 0 0 1.15rem;
  padding-left: 1.15rem;
}

.sec li { margin-bottom: 0.5rem; }

.figures {
  display: flex;
  flex-wrap: wrap;
  gap: 1.75rem 2.75rem;
  margin: 1.75rem 0 1.5rem;
  padding: 1.4rem 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

.figure .n {
  display: block;
  font-family: var(--mono);
  font-size: 1.45rem;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  color: var(--accent);
}

.figure .k {
  display: block;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-top: 0.3rem;
}

.endnote {
  max-width: var(--measure);
  margin-left: calc(var(--rail) + var(--gutter));
  padding: 2.25rem 0 0;
  border-top: 1px solid var(--rule);
  font-size: 0.98rem;
  color: var(--muted);
}

.endnote a { color: var(--ink); }

/* ---------- footer ---------- */

footer {
  border-top: 1px solid var(--rule);
  margin-top: 1rem;
  padding: 2rem 0 3.5rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  color: var(--muted);
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

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

@media (max-width: 720px) {
  body { font-size: 1.02rem; }

  .sec, .essayhead {
    grid-template-columns: minmax(0, 1fr);
    gap: 1.1rem;
  }

  .rail {
    position: static;
    text-align: left;
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 0.5rem 1rem;
  }

  .rail .num { margin-bottom: 0; }

  .rail .src {
    border-top: 0;
    padding-top: 0;
  }

  .rail .src span { display: inline; }

  .rail .src span + span::before {
    content: " / ";
    color: var(--rule);
  }

  .endnote { margin-left: 0; }

  .docmeta {
    grid-template-columns: minmax(0, 1fr);
    gap: 0.25rem;
  }

  .docmeta dd { margin-bottom: 0.85rem; }

  .linklist .label { min-width: 4.5rem; }
}

@media (prefers-reduced-motion: no-preference) {
  .hero, .essayhead {
    animation: rise 0.5s ease-out both;
  }
}

@keyframes rise {
  from { opacity: 0; transform: translateY(0.5rem); }
  to { opacity: 1; transform: none; }
}