:root {
  color-scheme: light dark;
  --paper: #f4f2eb;
  --surface: #faf9f5;
  --ink: #1b211e;
  --muted: #66706a;
  --quiet: #89918c;
  --line: #d7d9d2;
  --accent: #275c4d;
  --accent-soft: #dce8e1;
  --focus: #a9602c;
  --measure: 72rem;
  --reading: 43rem;
  --sans: "Segoe UI Variable Text", "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  --mono: "Cascadia Code", "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 18rem;
  min-height: 100vh;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1rem;
  line-height: 1.65;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body::before {
  display: block;
  height: 0.25rem;
  background: var(--accent);
  content: "";
}

a {
  color: inherit;
  text-decoration-thickness: 0.075em;
  text-underline-offset: 0.18em;
}

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

a:focus-visible,
button:focus-visible {
  outline: 0.18rem solid var(--focus);
  outline-offset: 0.2rem;
  border-radius: 0.1rem;
}

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

.skip-link {
  position: fixed;
  z-index: 20;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.55rem 0.8rem;
  transform: translateY(-180%);
  background: var(--ink);
  color: var(--paper);
  font-weight: 650;
  text-decoration: none;
}

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

.shell {
  width: min(calc(100% - 3rem), var(--measure));
  margin-inline: auto;
}

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

.header-inner {
  display: flex;
  min-height: 5rem;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--ink);
  font-size: 0.94rem;
  font-weight: 720;
  letter-spacing: 0.08em;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  width: 1.8rem;
  height: 1.8rem;
  place-items: center;
  border-radius: 0.3rem;
  background: var(--accent);
  color: #f7f3e9;
  font-size: 0.76rem;
  font-weight: 760;
  letter-spacing: 0;
}

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

.site-nav ul {
  display: flex;
  margin: 0;
  padding: 0;
  align-items: center;
  gap: clamp(1rem, 2.5vw, 2rem);
  list-style: none;
}

.site-nav a {
  display: inline-block;
  position: relative;
  padding: 0.25rem 0;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 580;
  text-decoration: none;
}

.site-nav a::after {
  position: absolute;
  right: 0;
  bottom: -0.22rem;
  left: 0;
  height: 0.1rem;
  transform: scaleX(0);
  transform-origin: right;
  background: var(--accent);
  content: "";
  transition: transform 160ms ease;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--ink);
}

.site-nav a:hover::after,
.site-nav a[aria-current="page"]::after {
  transform: scaleX(1);
  transform-origin: left;
}

main {
  display: block;
}

.hero {
  display: grid;
  min-height: 34rem;
  padding-block: clamp(5rem, 10vw, 8.5rem);
  grid-template-columns: minmax(0, 2.1fr) minmax(15rem, 0.9fr);
  gap: clamp(4rem, 9vw, 8rem);
  align-items: end;
}

.eyebrow {
  margin: 0 0 1.3rem;
  color: var(--accent);
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 650;
  letter-spacing: 0.12em;
  line-height: 1.4;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin-top: 0;
  color: var(--ink);
  font-weight: 640;
  letter-spacing: -0.035em;
  line-height: 1.12;
}

h1 {
  max-width: 13ch;
  margin-bottom: 1.6rem;
  font-size: clamp(3.1rem, 7.2vw, 6.6rem);
  text-wrap: balance;
}

.lede {
  max-width: 38rem;
  margin: 0;
  color: var(--muted);
  font-size: clamp(1.08rem, 1.7vw, 1.28rem);
  line-height: 1.7;
}

.hero-index {
  padding-top: 1.15rem;
  border-top: 1px solid var(--ink);
}

.index-label {
  display: flex;
  margin-bottom: 1.2rem;
  justify-content: space-between;
  gap: 1rem;
  color: var(--quiet);
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.focus-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.focus-list li {
  padding-block: 0.68rem;
  border-bottom: 1px solid var(--line);
  font-size: 0.94rem;
}

.section {
  padding-block: clamp(4.2rem, 8vw, 7rem);
  border-top: 1px solid var(--line);
}

.section-heading {
  display: grid;
  margin-bottom: 2.6rem;
  grid-template-columns: minmax(0, 1fr) minmax(15rem, 2fr);
  gap: 2rem;
  align-items: baseline;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(1.75rem, 3vw, 2.4rem);
}

.section-heading p {
  max-width: 34rem;
  margin: 0;
  color: var(--muted);
}

.note-list {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.note-item {
  display: grid;
  padding-block: 1.7rem;
  border-bottom: 1px solid var(--line);
  grid-template-columns: 8rem minmax(0, 1fr) auto;
  gap: 2rem;
  align-items: start;
}

.note-meta,
.article-meta,
.project-meta {
  color: var(--quiet);
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.025em;
  line-height: 1.6;
  text-transform: uppercase;
}

.note-title {
  margin: 0 0 0.35rem;
  font-size: clamp(1.15rem, 2vw, 1.42rem);
  letter-spacing: -0.025em;
}

.note-title a {
  text-decoration: none;
}

.note-summary {
  max-width: 37rem;
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
}

.arrow-link {
  display: inline-flex;
  width: 2rem;
  height: 2rem;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--line);
  border-radius: 50%;
  color: var(--muted);
  font-family: var(--mono);
  text-decoration: none;
  transition: border-color 160ms ease, color 160ms ease, transform 160ms ease;
}

.arrow-link:hover {
  transform: translateX(0.16rem);
  border-color: var(--accent);
  color: var(--accent);
}

.principles {
  display: grid;
  margin: 0;
  padding: 0;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  list-style: none;
}

.principles li {
  min-height: 12rem;
  padding: 1.7rem;
  background: var(--surface);
}

.principle-number {
  display: block;
  margin-bottom: 3.3rem;
  color: var(--quiet);
  font-family: var(--mono);
  font-size: 0.7rem;
}

.principles strong {
  display: block;
  margin-bottom: 0.55rem;
  font-size: 1.02rem;
}

.principles p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.page-intro {
  display: grid;
  padding-block: clamp(4.8rem, 10vw, 8rem);
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 2fr);
  gap: clamp(2.5rem, 8vw, 7rem);
  align-items: start;
}

.page-intro h1 {
  max-width: none;
  margin: 0;
  font-size: clamp(3rem, 6vw, 5.8rem);
}

.page-intro-copy {
  padding-top: 0.65rem;
}

.page-intro-copy p:not(.eyebrow) {
  max-width: 39rem;
  margin: 0;
  color: var(--muted);
  font-size: clamp(1.08rem, 1.8vw, 1.3rem);
}

.notes-archive .note-item {
  grid-template-columns: 9rem minmax(0, 1fr) auto;
}

.project-list {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.project-item {
  display: grid;
  padding-block: 2.4rem;
  border-bottom: 1px solid var(--line);
  grid-template-columns: 9rem minmax(0, 1fr);
  gap: 2rem;
}

.project-item h2 {
  margin-bottom: 0.7rem;
  font-size: clamp(1.4rem, 2.4vw, 1.9rem);
}

.project-item p {
  max-width: 42rem;
  margin: 0;
  color: var(--muted);
}

.project-links {
  display: flex;
  margin-top: 1.2rem;
  flex-wrap: wrap;
  gap: 0.8rem 1.4rem;
  font-size: 0.88rem;
  font-weight: 600;
}

.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(15rem, 0.8fr);
  gap: clamp(3rem, 9vw, 8rem);
}

.about-copy {
  max-width: var(--reading);
  font-size: 1.08rem;
}

.about-copy p:first-child {
  margin-top: 0;
  color: var(--ink);
  font-size: clamp(1.35rem, 2.4vw, 1.8rem);
  letter-spacing: -0.025em;
  line-height: 1.45;
}

.about-copy p {
  color: var(--muted);
}

.about-aside {
  align-self: start;
  padding-top: 1rem;
  border-top: 1px solid var(--ink);
}

.about-aside dl {
  margin: 0;
}

.about-aside div {
  padding-block: 0.9rem;
  border-bottom: 1px solid var(--line);
}

.about-aside dt {
  margin-bottom: 0.25rem;
  color: var(--quiet);
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.about-aside dd {
  margin: 0;
  font-size: 0.92rem;
}

.article-header {
  max-width: 54rem;
  padding-block: clamp(4.8rem, 10vw, 8.5rem) clamp(3.5rem, 7vw, 5.5rem);
}

.article-header h1 {
  max-width: 12ch;
  margin-bottom: 1.5rem;
  font-size: clamp(3rem, 6.3vw, 5.8rem);
}

.article-deck {
  max-width: 42rem;
  margin: 0 0 1.8rem;
  color: var(--muted);
  font-size: clamp(1.08rem, 1.8vw, 1.28rem);
}

.article-layout {
  display: grid;
  padding-block: 4.5rem 7rem;
  border-top: 1px solid var(--line);
  grid-template-columns: minmax(8rem, 0.55fr) minmax(0, var(--reading)) minmax(0, 0.45fr);
  gap: clamp(2rem, 5vw, 4rem);
}

.article-index {
  position: sticky;
  top: 2rem;
  align-self: start;
  color: var(--quiet);
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.article-body {
  min-width: 0;
}

.article-body p {
  margin: 0 0 1.55rem;
}

.article-body h2 {
  margin: 3.4rem 0 1rem;
  font-size: clamp(1.55rem, 2.5vw, 2rem);
}

.article-body ul,
.article-body ol {
  margin: 0 0 1.6rem;
  padding-left: 1.25rem;
}

.article-body li + li {
  margin-top: 0.5rem;
}

.article-body code {
  padding: 0.1em 0.3em;
  border: 1px solid var(--line);
  border-radius: 0.2rem;
  background: var(--surface);
  font-family: var(--mono);
  font-size: 0.84em;
}

.article-callout {
  margin: 2.3rem 0;
  padding: 1.3rem 1.5rem;
  border-left: 0.2rem solid var(--accent);
  background: var(--surface);
}

.article-callout p {
  margin: 0;
  font-size: 0.94rem;
}

.article-footer {
  display: flex;
  margin-top: 4rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--line);
  justify-content: space-between;
  gap: 1.5rem;
  font-size: 0.9rem;
}

.error-page {
  display: grid;
  min-height: calc(100vh - 10.5rem);
  padding-block: 5rem;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr);
  gap: 4rem;
  align-items: center;
}

.error-code {
  color: var(--accent);
  font-family: var(--mono);
  font-size: clamp(6rem, 18vw, 14rem);
  font-weight: 650;
  letter-spacing: -0.09em;
  line-height: 0.8;
}

.error-copy h1 {
  max-width: 10ch;
  font-size: clamp(2.6rem, 5vw, 4.8rem);
}

.error-copy p {
  max-width: 33rem;
  color: var(--muted);
  font-size: 1.08rem;
}

.text-link {
  display: inline-block;
  margin-top: 1rem;
  color: var(--ink);
  font-weight: 650;
}

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

.footer-inner {
  display: flex;
  min-height: 5.4rem;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  color: var(--quiet);
  font-size: 0.76rem;
}

.footer-note {
  font-family: var(--mono);
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #121613;
    --surface: #181d19;
    --ink: #e9ede8;
    --muted: #a2ada6;
    --quiet: #7e8982;
    --line: #303832;
    --accent: #8fc4ad;
    --accent-soft: #29463a;
    --focus: #e09a63;
  }

  .brand-mark {
    background: #8fc4ad;
    color: #102018;
  }
}
@media (max-width: 48rem) {
  .shell {
    width: min(calc(100% - 2rem), var(--measure));
  }

  .header-inner {
    min-height: 4.5rem;
    gap: 1rem;
  }

  .brand {
    font-size: 0;
    gap: 0;
  }

  .brand-mark {
    width: 1.95rem;
    height: 1.95rem;
    font-size: 0.78rem;
  }

  .site-nav ul {
    gap: clamp(0.72rem, 3.7vw, 1.2rem);
  }

  .site-nav a {
    font-size: 0.8rem;
  }

  .hero {
    min-height: 0;
    padding-block: 4.8rem 4.5rem;
    grid-template-columns: 1fr;
    gap: 4rem;
  }

  h1 {
    font-size: clamp(3rem, 15vw, 4.8rem);
  }

  .section-heading,
  .page-intro,
  .about-grid,
  .error-page {
    grid-template-columns: 1fr;
  }

  .section-heading {
    gap: 1rem;
  }

  .page-intro {
    padding-block: 4.5rem;
    gap: 2rem;
  }

  .page-intro-copy {
    padding-top: 0;
  }

  .note-item,
  .notes-archive .note-item {
    position: relative;
    grid-template-columns: 1fr auto;
    gap: 0.7rem 1rem;
  }

  .note-meta {
    grid-column: 1 / -1;
  }

  .principles {
    grid-template-columns: 1fr;
  }

  .principles li {
    min-height: 0;
  }

  .principle-number {
    margin-bottom: 2rem;
  }

  .project-item {
    grid-template-columns: 1fr;
    gap: 0.8rem;
  }

  .article-layout {
    padding-block: 3.5rem 5rem;
    grid-template-columns: 1fr;
  }

  .article-index {
    position: static;
  }

  .error-page {
    min-height: calc(100vh - 10rem);
    gap: 2.8rem;
    align-content: center;
  }

  .error-code {
    font-size: clamp(6rem, 36vw, 10rem);
  }

  .footer-inner {
    min-height: 6rem;
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    gap: 0.2rem;
  }
}

@media (max-width: 23rem) {
  .site-nav ul {
    gap: 0.6rem;
  }

  .site-nav a {
    font-size: 0.75rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}