@font-face {
  font-family: "Instrument Serif";
  src: url("fonts/InstrumentSerif-Regular.ttf") format("truetype");
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}

@font-face {
  font-family: "Instrument Serif";
  src: url("fonts/InstrumentSerif-Italic.ttf") format("truetype");
  font-style: italic;
  font-weight: 400;
  font-display: swap;
}

:root {
  --page: #f7f4ed;
  --ink: #1c1b18;
  --muted: #59564f;
  --line: #d8d1c5;
  --accent: #b32b09;
  --focus: #f83e0f;
  --page-width: 68rem;
  --reading-width: 42rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  background: var(--page);
}

body {
  min-width: 0;
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 1.125rem;
  line-height: 1.68;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3,
p,
ol,
ul {
  margin-top: 0;
}

h1,
h2 {
  font-family: "Instrument Serif", Georgia, serif;
  font-weight: 400;
  letter-spacing: -0.025em;
}

h1 {
  max-width: 13ch;
  margin-bottom: 1.75rem;
  font-size: clamp(3rem, 7vw, 4rem);
  line-height: 1.02;
}

h2 {
  margin-bottom: 1.25rem;
  font-size: clamp(2.25rem, 5vw, 2.75rem);
  line-height: 1.08;
}

h3 {
  margin-bottom: 0.7rem;
  font-size: 1.4rem;
  line-height: 1.3;
}

p {
  margin-bottom: 1.25rem;
}

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

a {
  color: var(--accent);
  text-decoration-line: underline;
  text-decoration-thickness: 0.09em;
  text-underline-offset: 0.18em;
}

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

a:focus-visible {
  outline: 3px solid var(--focus);
  outline-offset: 4px;
  border-radius: 1px;
}

.skip-link {
  position: fixed;
  z-index: 10;
  top: 1rem;
  left: 1rem;
  padding: 0.65rem 0.85rem;
  transform: translateY(-200%);
  background: var(--ink);
  color: var(--page);
}

.skip-link:focus {
  transform: translateY(0);
}

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

.header-inner,
.site-main,
.footer-inner {
  width: min(calc(100% - 3rem), var(--page-width));
  margin-inline: auto;
}

.header-inner {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1.5rem 3rem;
  padding-block: 1.25rem;
}

.wordmark {
  color: var(--ink);
  font-family: "Instrument Serif", Georgia, serif;
  font-size: 1.8rem;
  line-height: 1;
  text-decoration: none;
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.4rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 1rem;
}

.nav-list a {
  color: var(--ink);
  text-decoration-thickness: 1px;
  text-decoration-color: transparent;
}

.nav-list a:hover,
.nav-list a[aria-current="page"] {
  color: var(--accent);
  text-decoration-color: currentColor;
}

.hero {
  max-width: 52rem;
  padding-block: clamp(5rem, 10vw, 8rem);
}

.hero-lede {
  max-width: var(--reading-width);
  margin-bottom: 1.75rem;
  color: var(--muted);
  font-size: clamp(1.2rem, 2.4vw, 1.4rem);
  line-height: 1.58;
}

.text-link {
  font-weight: 650;
}

.content-section {
  padding-bottom: clamp(4.5rem, 9vw, 7rem);
  scroll-margin-top: 2rem;
}

.home-section {
  max-width: 58rem;
  padding-bottom: clamp(4.5rem, 9vw, 7rem);
}

.home-route-list {
  max-width: var(--reading-width);
  margin: 3rem 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.home-route {
  padding-block: 2rem;
  border-bottom: 1px solid var(--line);
}

.home-route h3 {
  margin-bottom: 0.65rem;
}

.home-route > p {
  max-width: var(--reading-width);
  color: var(--muted);
}

.home-route > p:last-child {
  margin-top: 1.25rem;
  color: var(--ink);
}

.section-heading,
.prose-section {
  max-width: var(--reading-width);
}

.section-heading > p,
.prose-section > p:not(:last-child) {
  color: var(--muted);
}

.levels-list {
  max-width: 58rem;
  margin: 3rem 0 0;
  padding: 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.level {
  display: grid;
  grid-template-columns: 8rem minmax(0, 1fr);
  gap: 1rem 2.5rem;
  padding-block: 2.5rem;
  border-bottom: 1px solid var(--line);
}

.level-label {
  margin: 0;
  color: var(--accent);
  font-weight: 700;
}

.level-content {
  max-width: var(--reading-width);
}

.level-content > p {
  color: var(--muted);
}

.level-content .next-move {
  margin-top: 1.25rem;
  color: var(--ink);
}

.next-move strong {
  font-weight: 700;
}

.related-reading,
.method-related {
  margin-top: 1.25rem;
  font-size: 1rem;
}

.method-related {
  color: var(--muted);
}

.prose-section {
  position: relative;
}

.prose-section::before {
  display: block;
  width: 3rem;
  height: 0.25rem;
  margin-bottom: 2rem;
  background: var(--focus);
  content: "";
}

.method-article {
  max-width: 58rem;
  padding-block: clamp(5rem, 9vw, 7rem);
}

.method-hero {
  max-width: var(--reading-width);
  margin-bottom: clamp(5rem, 10vw, 7rem);
}

.method-hero h1 {
  max-width: none;
}

.method-lede {
  color: var(--muted);
  font-size: clamp(1.2rem, 2.4vw, 1.4rem);
  line-height: 1.58;
}

.method-summary,
.method-principle {
  margin-top: 2rem;
  padding-left: 1.25rem;
  border-left: 0.25rem solid var(--focus);
  color: var(--ink);
}

.method-section {
  max-width: var(--reading-width);
  margin-bottom: clamp(4.5rem, 9vw, 6.5rem);
  scroll-margin-top: 2rem;
}

.method-section > p:not(.method-summary):not(.method-principle) {
  color: var(--muted);
}

.method-definitions {
  margin: 2.5rem 0;
  border-top: 1px solid var(--line);
}

.method-definitions > div {
  padding-block: 1.75rem;
  border-bottom: 1px solid var(--line);
}

.method-definitions dt {
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.3;
}

.method-definitions dd {
  margin: 0.65rem 0 0;
  color: var(--muted);
}

.method-steps {
  margin: 2.5rem 0 2rem;
  padding-left: 1.5rem;
  border-top: 1px solid var(--line);
}

.method-steps li {
  padding: 1.75rem 0 1.75rem 0.5rem;
  border-bottom: 1px solid var(--line);
}

.method-steps li::marker {
  color: var(--accent);
  font-weight: 700;
}

.method-steps h3 {
  margin-bottom: 0.65rem;
}

.method-steps p {
  margin: 0;
  color: var(--muted);
}

code {
  font-family: ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
  font-size: 0.92em;
}

.article-page {
  max-width: 58rem;
  padding-block: clamp(5rem, 9vw, 7rem);
}

.article-hero {
  max-width: var(--reading-width);
  margin-bottom: clamp(4.5rem, 9vw, 6.5rem);
}

.article-hero h1 {
  max-width: none;
}

.article-eyebrow {
  margin-bottom: 1rem;
  color: var(--accent);
  font-size: 0.95rem;
  font-weight: 700;
}

.article-eyebrow a {
  color: inherit;
  text-decoration-thickness: 1px;
}

.article-lede {
  color: var(--muted);
  font-size: clamp(1.2rem, 2.4vw, 1.4rem);
  line-height: 1.58;
}

.article-principle,
.article-tldr {
  margin: 2rem 0 0;
  padding-left: 1.25rem;
  border-left: 0.25rem solid var(--focus);
  color: var(--ink);
}

.article-tldr p {
  margin: 0;
}

.article-section {
  max-width: var(--reading-width);
  margin-bottom: clamp(4.5rem, 9vw, 6.5rem);
  scroll-margin-top: 2rem;
}

.article-section > p:not(.article-note) {
  color: var(--muted);
}

.article-section > ul,
.article-section > ol {
  margin: 2rem 0;
  padding-left: 1.5rem;
}

.article-section li + li {
  margin-top: 0.9rem;
}

.article-steps,
.article-review-list,
.article-reading-paths,
.article-list {
  border-top: 1px solid var(--line);
}

.article-steps,
.article-review-list,
.article-reading-paths {
  list-style-position: outside;
}

.article-steps > li,
.article-review-list > li,
.article-reading-paths > li,
.article-list > li {
  padding: 1.5rem 0 1.5rem 0.5rem;
  border-bottom: 1px solid var(--line);
}

.article-steps li::marker,
.article-review-list li::marker,
.article-reading-paths li::marker,
.article-list li::marker {
  color: var(--accent);
  font-weight: 700;
}

.article-review-list h3,
.article-reading-paths h3 {
  margin-bottom: 0.65rem;
}

.article-review-list p,
.article-reading-paths p,
.article-list p {
  margin: 0;
  color: var(--muted);
}

.article-jumps {
  display: flex;
  max-width: var(--reading-width);
  flex-wrap: wrap;
  gap: 0.65rem 1.25rem;
  margin: 0 0 clamp(4.5rem, 9vw, 6.5rem);
  padding: 1.25rem 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  font-size: 1rem;
}

.article-level {
  max-width: var(--reading-width);
  margin-bottom: clamp(4.5rem, 9vw, 6.5rem);
  scroll-margin-top: 2rem;
}

.article-level > p {
  color: var(--muted);
}

.article-list {
  margin: 0;
  padding-left: 1.5rem;
}

.article-list > li {
  padding-left: 0.5rem;
}

.article-list > li > a {
  font-weight: 700;
}

.article-data {
  margin: 2rem 0;
  border-top: 1px solid var(--line);
}

.article-data > div {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1rem;
  padding-block: 0.8rem;
  border-bottom: 1px solid var(--line);
}

.article-data dt {
  color: var(--muted);
}

.article-data dd {
  margin: 0;
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  text-align: right;
}

.article-note {
  color: var(--ink) !important;
  font-size: 1rem;
  font-style: italic;
}

.article-pagination {
  display: grid;
  max-width: var(--reading-width);
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  gap: 1rem;
  align-items: center;
  padding: 1.5rem 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  font-size: 1rem;
}

.pagination-previous {
  grid-column: 1;
}

.pagination-all {
  grid-column: 2;
  font-weight: 700;
  white-space: nowrap;
}

.pagination-next {
  grid-column: 3;
  text-align: right;
}

.holding-page {
  display: flex;
  min-height: 72vh;
  max-width: var(--reading-width);
  flex-direction: column;
  justify-content: center;
  padding-block: 5rem;
}

.holding-page h1 {
  max-width: none;
}

.holding-page > p {
  max-width: 38rem;
  color: var(--muted);
}

.error-code {
  margin-bottom: 0.75rem;
  color: var(--accent) !important;
  font-weight: 700;
}

.site-footer {
  border-top: 1px solid var(--line);
}

.footer-inner {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem 3rem;
  padding-block: 2.5rem 3rem;
  font-size: 1rem;
}

.footer-inner p {
  margin: 0;
}

@media (max-width: 44rem) {
  body {
    font-size: 1.0625rem;
  }

  .header-inner,
  .site-main,
  .footer-inner {
    width: min(calc(100% - 2rem), var(--page-width));
  }

  .header-inner {
    align-items: flex-start;
    flex-direction: column;
    gap: 1rem;
  }

  .nav-list {
    gap: 0.35rem 0.8rem;
    font-size: 0.95rem;
  }

  .hero {
    padding-block: 4.5rem 5.5rem;
  }

  h1 {
    font-size: clamp(2.65rem, 13vw, 3.35rem);
  }

  .level {
    grid-template-columns: 1fr;
    gap: 0.45rem;
    padding-block: 2rem;
  }

  .footer-inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .article-data > div {
    grid-template-columns: 1fr;
    gap: 0.15rem;
  }

  .article-data dd {
    text-align: left;
  }

  .article-pagination {
    grid-template-columns: 1fr;
    gap: 0.75rem;
    align-items: start;
  }

  .pagination-previous,
  .pagination-all,
  .pagination-next {
    grid-column: 1;
    text-align: left;
  }
}



@media (forced-colors: active) {
  .prose-section::before {
    background: CanvasText;
  }
}