:root {
  color-scheme: dark;
  --canvas: #121110;
  --surface: #191816;
  --surface-2: #1f1e1b;
  --fg: #f8f3e9;
  --muted: #bfb39a;
  --subtle: #928772;
  --line: #2a2723;
  --line-strong: #3a3630;
  --accent: #ff5c33;
  --accent-soft: #ffa07f;
  --serif: ui-serif, Georgia, Cambria, "Times New Roman", Times, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial,
    sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  --measure: 46rem;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--canvas);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 18px;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: var(--accent);
  color: var(--canvas);
}

a {
  color: var(--accent-soft);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.18em;
}

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

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

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--accent);
  color: var(--canvas);
  padding: 0.6rem 1rem;
  font-weight: 700;
  z-index: 10;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

.wrap {
  width: min(100% - 2.5rem, var(--measure));
  margin-inline: auto;
}

.site-header {
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--canvas) 88%, transparent);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 5;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 4rem;
}

.brand {
  color: var(--fg);
  text-decoration: none;
  font-family: var(--serif);
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}

.brand:hover {
  color: var(--accent-soft);
}

.site-header nav {
  display: flex;
  gap: 1.1rem;
  font-size: 0.82rem;
  letter-spacing: 0.01em;
}

.site-header nav a {
  color: var(--muted);
  text-decoration: none;
}

.site-header nav a:hover {
  color: var(--fg);
}

main {
  padding: 3.5rem 0 4rem;
}

.article-header {
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--line);
}

.eyebrow {
  margin: 0 0 1rem;
  color: var(--accent-soft);
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  font-family: var(--serif);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.12;
  text-wrap: balance;
}

h1 {
  margin: 0;
  font-size: clamp(2.1rem, 6vw, 3.4rem);
}

h2 {
  margin: 0 0 1rem;
  font-size: clamp(1.55rem, 4vw, 2.15rem);
}

h3 {
  font-size: 1.25rem;
}

p {
  margin: 0 0 1.15rem;
}

.lede {
  margin: 1.35rem 0 0;
  color: var(--muted);
  font-size: clamp(1.1rem, 2.6vw, 1.3rem);
  line-height: 1.55;
  max-width: 40rem;
}

.meta {
  margin: 1.4rem 0 0;
  color: var(--subtle);
  font-size: 0.82rem;
  font-family: var(--mono);
}

.toc {
  margin: 2rem 0 2.5rem;
  padding: 1.25rem 1.35rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 0.6rem;
}

.toc-title {
  margin: 0 0 0.6rem;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.toc ol {
  margin: 0;
  padding-left: 1.25rem;
  columns: 2;
  column-gap: 2rem;
  font-size: 0.92rem;
}

.toc li {
  margin: 0.3rem 0;
  break-inside: avoid;
}

.toc a {
  color: var(--fg);
  text-decoration: none;
}

.toc a:hover {
  color: var(--accent-soft);
  text-decoration: underline;
}

section {
  margin-top: 3.2rem;
  scroll-margin-top: 5rem;
}

hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 3rem 0;
}

ul,
ol {
  margin: 0 0 1.2rem;
  padding-left: 1.3rem;
}

li {
  margin: 0.45rem 0;
}

li::marker {
  color: var(--accent-soft);
}

strong {
  color: var(--fg);
  font-weight: 650;
}

em {
  color: var(--fg);
}

blockquote {
  margin: 1.5rem 0;
  padding: 1rem 1.25rem;
  background: var(--surface);
  border-left: 3px solid var(--accent);
  border-radius: 0 0.4rem 0.4rem 0;
  color: var(--fg);
  font-family: var(--serif);
  font-size: 1.12rem;
}

blockquote p:last-child {
  margin-bottom: 0;
}

.note {
  margin: 1.4rem 0;
  padding: 0.9rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  color: var(--muted);
  font-size: 0.95rem;
  background: var(--surface-2);
}

.tests li,
.structure li {
  margin: 0.7rem 0;
}

.example {
  margin: 1.4rem 0;
  padding: 1.15rem 1.25rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 0.6rem;
  font-size: 0.97rem;
}

.example p {
  margin-bottom: 0.8rem;
}

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

.example-label {
  color: var(--accent-soft);
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.subject {
  color: var(--fg);
  font-family: var(--mono);
  font-size: 0.88rem;
  padding-bottom: 0.7rem;
  border-bottom: 1px dashed var(--line-strong);
}

.signature {
  color: var(--muted);
  font-size: 0.88rem;
}

.plan {
  display: grid;
  gap: 0.6rem;
  margin: 1.4rem 0;
}

.plan div {
  padding: 0.75rem 0.95rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 0.45rem;
  font-size: 0.95rem;
}

.plan strong {
  color: var(--accent-soft);
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  display: inline-block;
  min-width: 8.5rem;
}

.tools li {
  margin: 0.8rem 0;
}

.closing {
  margin-top: 2.5rem;
}

.article-footer {
  margin-top: 3.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.88rem;
}

.article-footer .small {
  color: var(--subtle);
  font-size: 0.8rem;
}

@media (max-width: 640px) {
  body {
    font-size: 17px;
  }

  .header-inner {
    align-items: flex-start;
    flex-direction: column;
    gap: 0.35rem;
    padding: 0.85rem 0;
  }

  .site-header nav {
    flex-wrap: wrap;
    gap: 0.8rem;
    font-size: 0.78rem;
  }

  .toc ol {
    columns: 1;
  }

  main {
    padding-top: 2.4rem;
  }

  .plan strong {
    display: block;
    min-width: 0;
    margin-bottom: 0.15rem;
  }
}

@media print {
  :root {
    color-scheme: light;
    --canvas: #fff;
    --surface: #fff;
    --surface-2: #fff;
    --fg: #111;
    --muted: #333;
    --subtle: #555;
    --line: #ccc;
    --line-strong: #999;
    --accent: #b33a1a;
    --accent-soft: #8a2c14;
  }

  body {
    font-size: 11pt;
  }

  .site-header,
  .toc {
    display: none;
  }

  a {
    color: inherit;
    text-decoration: underline;
  }

  section {
    break-inside: avoid;
  }
}