:root {
  color-scheme: light;
  --rail: #f4f5f6;
  --main: #ffffff;
  --open: #ffffff;
  --ink: #1c1c1c;
  --prose: #1c1c1c;
  --dim: #5c656e;
  --faint: #8b939c;
  --line: #e3e3e3;
  --red: #da4453;
  --code-bg: #1c2128;
  --code-fg: #f4f6f8;
  --code-border: transparent;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --rail: #0c0c0c;
  --main: #161616;
  --open: #141414;
  --ink: #eceae4;
  --prose: #dddacf;
  --dim: #8a8a86;
  --faint: #5f5f5c;
  --line: #2a2a2a;
  --code-bg: #101010;
  --code-fg: #eceae4;
  --code-border: #2a2a2a;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --rail: #0c0c0c;
    --main: #161616;
    --open: #141414;
    --ink: #eceae4;
    --prose: #dddacf;
    --dim: #8a8a86;
    --faint: #5f5f5c;
    --line: #2a2a2a;
    --code-bg: #101010;
    --code-fg: #eceae4;
    --code-border: #2a2a2a;
  }
}

* { box-sizing: border-box; }

html, body { margin: 0; }

body {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 320px 1fr;
  background: var(--main);
  color: var(--ink);
  font-family: "Avenir Next", Avenir, "Segoe UI", sans-serif;
}

.skip {
  position: absolute;
  left: 12px;
  top: 12px;
  transform: translateY(-150%);
  background: var(--main);
  color: var(--ink);
  padding: 8px 12px;
  z-index: 2;
}

.skip:focus { transform: none; }

nav {
  background: var(--rail);
  border-right: 1px solid var(--line);
  padding: 28px 0 24px;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.brand {
  padding: 4px 22px 22px;
  color: inherit;
  text-decoration: none;
  font-size: 32px;
  font-weight: 600;
  letter-spacing: -0.03em;
  line-height: 1;
}

nav ol {
  list-style: none;
  margin: 0;
  padding: 0;
}

nav li a {
  display: block;
  padding: 10px 22px 10px 19px;
  border-left: 3px solid transparent;
  color: var(--dim);
  text-decoration: none;
  font-family: "SF Mono", ui-monospace, Menlo, monospace;
  font-size: 12px;
  line-height: 1.45;
}

nav li a time {
  display: block;
  color: var(--faint);
  margin-bottom: 2px;
}

nav li a.open {
  color: var(--ink);
  border-left-color: var(--red);
  background: var(--open);
}

nav li a:hover { color: var(--ink); }

.rail-foot {
  margin-top: auto;
  display: flex;
  gap: 16px;
  padding: 18px 22px 0;
  font-family: "SF Mono", ui-monospace, Menlo, monospace;
  font-size: 12px;
}

.rail-foot a,
.rail-foot button {
  color: var(--dim);
  background: none;
  border: 0;
  padding: 0;
  font: inherit;
  cursor: pointer;
  text-decoration: none;
}

.rail-foot a:hover,
.rail-foot button:hover { color: var(--ink); }

main {
  padding: 36px 48px 64px;
  max-width: 760px;
}

.kicker {
  margin: 0 0 12px;
  color: var(--dim);
  font-family: "SF Mono", ui-monospace, Menlo, monospace;
  font-size: 12px;
}

h1 {
  margin: 0 0 18px;
  font-weight: 600;
  font-size: 32px;
  letter-spacing: -0.025em;
  line-height: 1.15;
}

main p,
main li {
  font-size: 18px;
  line-height: 1.5;
  color: var(--prose);
}

main p { margin: 0 0 14px; }

main ul {
  margin: 0 0 14px;
  padding-left: 1.2em;
}

main li { margin: 0 0 10px; }

main li p:last-child { margin-bottom: 0; }

main a { color: var(--red); }

main pre {
  margin: 8px 0 16px;
  padding: 14px 16px;
  background: var(--code-bg);
  color: var(--code-fg);
  border: 1px solid var(--code-border);
  font-family: "SF Mono", ui-monospace, Menlo, monospace;
  font-size: 14.5px;
  line-height: 1.5;
  white-space: pre;
  overflow-x: auto;
}

main code {
  font-family: "SF Mono", ui-monospace, Menlo, monospace;
  font-size: 0.92em;
}

main pre code { font-size: inherit; }

.colophon {
  margin-top: 28px;
  color: var(--dim);
  font-family: "SF Mono", ui-monospace, Menlo, monospace;
  font-size: 12px;
}

.colophon a { color: var(--dim); }

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--red);
  outline-offset: 2px;
}

@media (max-width: 760px) {
  body { display: block; }
  nav {
    min-height: 0;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  main { padding: 28px 22px 48px; }
}