:root {
  color-scheme: dark;
  --paper: #101719;
  --paper-bright: #182326;
  --ink: #e7efea;
  --muted: #a6b6ae;
  --body-copy: #d1ddd6;
  --line: #394942;
  --green: #86c9a4;
  --green-pale: #243d32;
  --orange: #f09475;
  --warning-panel: #33211b;
  --warning-border: #704633;
  --warning-copy: #efddd3;
  --warning-accent: #ffad86;
  --mono: "Cascadia Code", "SFMono-Regular", Consolas, monospace;
  --serif: Georgia, "Times New Roman", serif;
  --sans: "Segoe UI", Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.6;
}

a { color: inherit; }
a:focus-visible { outline: 3px solid var(--orange); outline-offset: 4px; }
code { color: rgb(220, 220, 170); }

.skip-link {
  position: absolute;
  top: -4rem;
  left: 1rem;
  z-index: 5;
  padding: .65rem 1rem;
  background: var(--ink);
  color: white;
}
.skip-link:focus { top: 1rem; }

.site-header {
  border-bottom: 1px solid var(--line);
  background: rgba(16, 23, 25, .92);
}
.header-inner {
  width: min(1100px, calc(100% - 3rem));
  min-height: 76px;
  margin: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}
.brand { display: flex; align-items: center; gap: .75rem; text-decoration: none; }
.brand-mark {
  display: grid;
  place-items: center;
  width: 43px;
  height: 39px;
  border: 1px solid var(--green);
  color: var(--green);
  font-family: var(--mono);
  font-size: .78rem;
  letter-spacing: -.12em;
}
.brand-mark span { color: var(--orange); }
.brand-name { font-size: .82rem; letter-spacing: .035em; }
.brand-name b { display: block; font-weight: 500; color: var(--muted); }
.site-header nav { display: flex; align-items: center; gap: 1.7rem; }
.site-header nav a {
  padding: .45rem 0;
  color: var(--muted);
  font-size: .78rem;
  text-decoration: none;
}
.site-header nav a:hover, .site-header nav a.active { color: var(--green); }
.site-header nav a.active { border-bottom: 2px solid var(--orange); }

main { width: min(1100px, calc(100% - 3rem)); margin: auto; }
.hero { padding: clamp(4rem, 9vw, 7.5rem) 0 3.2rem; }
.eyebrow {
  margin: 0;
  color: var(--green);
  font-family: var(--mono);
  font-size: .7rem;
  letter-spacing: .12em;
  text-transform: uppercase;
}
.status-dot {
  display: inline-block;
  width: .5rem;
  height: .5rem;
  margin: 0 .55rem .05rem 0;
  border-radius: 50%;
  background: var(--orange);
}
.hero h1 {
  max-width: 850px;
  margin: 1.1rem 0 2.5rem;
  font-family: var(--serif);
  font-size: clamp(3.3rem, 9vw, 7.5rem);
  font-weight: 400;
  letter-spacing: -.065em;
  line-height: .96;
}
.hero h1 em { color: var(--green); font-weight: 400; }
.hero-bottom { display: flex; align-items: end; justify-content: space-between; gap: 2rem; }
.hero-summary { max-width: 520px; margin: 0; color: var(--body-copy); font-size: 1.05rem; }
.hero-index {
  flex: 0 0 auto;
  margin: 0;
  color: var(--muted);
  font-family: var(--mono);
  font-size: .68rem;
  line-height: 1.9;
  text-align: right;
}
.hero-index span { color: var(--orange); }
.hero-rule { display: flex; gap: .4rem; margin-top: 3.3rem; }
.hero-rule span { width: 2.7rem; height: 3px; background: var(--line); }
.hero-rule span:first-child { width: 7rem; background: var(--green); }
.hero-rule span:last-child { background: var(--orange); }

.notes-section { padding: 2rem 0 6rem; }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 2rem; margin-bottom: 1.7rem; }
.section-heading h2, .principles h2 {
  margin: .35rem 0 0;
  font-family: var(--serif);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 400;
  letter-spacing: -.04em;
  line-height: 1.1;
}
.section-aside { max-width: 260px; margin: 0 0 .25rem; color: var(--muted); font-size: .82rem; }
.note-list { border-top: 1px solid var(--line); }
.note-card {
  position: relative;
  display: grid;
  grid-template-columns: 3.5rem minmax(0, 1fr) 8rem;
  align-items: center;
  gap: 1.25rem;
  min-height: 205px;
  padding: 2rem 1rem;
  border-bottom: 1px solid var(--line);
  transition: background-color .18s ease;
}
.note-card:hover { background: rgba(255, 255, 255, .035); }
.note-number { align-self: start; padding-top: .15rem; color: var(--orange); font-family: var(--mono); font-size: .75rem; }
.note-meta { display: flex; flex-wrap: wrap; gap: .55rem 1rem; margin: 0 0 .5rem; color: var(--muted); font-family: var(--mono); font-size: .64rem; }
.note-meta span:first-child { color: var(--green); }
.note-content h3 { max-width: 690px; margin: 0; font-family: var(--serif); font-size: clamp(1.45rem, 3vw, 2.1rem); font-weight: 400; letter-spacing: -.035em; line-height: 1.2; }
.note-content h3 a { text-decoration-color: transparent; text-decoration-thickness: 1px; text-underline-offset: .22em; }
.note-content h3 a:hover { text-decoration-color: var(--green); }
.note-description { max-width: 630px; margin: .65rem 0 .7rem; color: var(--body-copy); font-size: .88rem; }
.read-link, .text-link { color: var(--green); font-size: .76rem; font-weight: 600; text-decoration: none; }
.read-link span, .text-link span { display: inline-block; margin-left: .35rem; color: var(--orange); }
.note-glyph { display: flex; align-items: center; justify-content: center; color: var(--green); font-family: var(--mono); font-size: .72rem; }
.glyph-stack { flex-direction: column-reverse; gap: .35rem; }
.glyph-stack span { display: grid; place-items: center; width: 52px; height: 27px; border: 1px solid #688a78; background: var(--green-pale); }
.glyph-stack b { color: var(--orange); font-size: .8rem; font-weight: 500; }
.glyph-range { gap: .55rem; }
.glyph-range i { position: relative; display: block; width: 54px; height: 1px; background: var(--green); }
.glyph-range i::before, .glyph-range i::after { position: absolute; top: -3px; width: 7px; height: 7px; border: 1px solid var(--orange); border-radius: 50%; background: var(--paper); content: ""; }
.glyph-range i::before { left: 0; }
.glyph-range i::after { right: 0; }

.milestones-section { padding: 3rem 0 4rem; border-top: 1px solid var(--line); }
.milestone-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: .75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.milestone-list li {
  display: grid;
  grid-template-columns: 1.35rem minmax(0, 1fr);
  align-content: start;
  gap: .85rem;
  min-height: 125px;
  padding: 1rem;
  border: 1px solid var(--line);
  background: var(--paper-bright);
}
.milestone-check {
  display: grid;
  place-items: center;
  width: 1.2rem;
  height: 1.2rem;
  margin-top: .1rem;
  border: 1px solid var(--muted);
  color: var(--muted);
  font-size: .85rem;
  line-height: 1;
}
.milestone-check.is-checked { border-color: var(--green); background: var(--green-pale); color: var(--green); }
.milestone-list h3 { margin: 0 0 .4rem; color: var(--green); font-family: var(--mono); font-size: .72rem; font-weight: 600; line-height: 1.5; }
.milestone-list p { margin: 0; color: var(--body-copy); font-size: .82rem; line-height: 1.55; }

.limits-section {
  margin: 2rem 0 3rem;
  padding: clamp(1.25rem, 3.5vw, 2.5rem);
  border: 1px solid var(--warning-border);
  border-top: 4px solid var(--orange);
  border-radius: .35rem;
  background: var(--warning-panel);
}
.limits-section .eyebrow { color: var(--warning-accent); }
.limits-section .section-aside { color: var(--warning-copy); }
.limits-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 2.5rem;
  margin: 0 0 1.5rem;
  padding: 0;
  list-style: none;
}
.limits-list li { display: grid; gap: .35rem; padding: 1rem 0; border-bottom: 1px solid rgba(255, 173, 134, .24); }
.limits-list strong { color: var(--warning-accent); font-family: var(--mono); font-size: .7rem; letter-spacing: .04em; text-transform: uppercase; }
.limits-list span { color: var(--warning-copy); font-size: .86rem; }
.limits-list code { font-family: var(--mono); font-size: .85em; }
.limits-section .text-link { color: var(--warning-accent); }

.principles {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  padding: 3rem 0 5rem;
  border-top: 1px solid var(--line);
}
.principles h2 { color: var(--green); }
.principle-copy { align-self: end; max-width: 480px; }
.principle-copy p { margin: 0 0 1rem; color: var(--body-copy); font-size: .92rem; }

.site-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1.5rem max(1.5rem, calc((100% - 1100px) / 2));
  border-top: 1px solid var(--line);
  background: var(--paper-bright);
  color: var(--muted);
  font-family: var(--mono);
  font-size: .63rem;
}
.site-footer p { margin: 0; }
.footer-brand { color: var(--green); font-size: .78rem; text-decoration: none; }
.footer-brand span { padding-left: .5rem; color: var(--muted); font-size: .63rem; }
.page-link { display: flex; align-items: center; gap: .55rem; }
.copy-link-button {
  padding: .4rem .6rem;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--green);
  font: inherit;
  cursor: pointer;
}
.copy-link-button:hover { border-color: var(--green); background: var(--green-pale); }
.copy-link-button:focus-visible { outline: 3px solid var(--orange); outline-offset: 3px; }
.copy-link-status { min-width: 1ch; color: var(--green); }

/* Article pages */
.article-shell { display: grid; grid-template-columns: minmax(0, 740px) minmax(140px, 1fr); gap: 4rem; padding: 4.5rem 0 7rem; }
.article-main { min-width: 0; }
.article-kicker { display: flex; flex-wrap: wrap; gap: .6rem 1rem; color: var(--muted); font-family: var(--mono); font-size: .68rem; }
.article-kicker span:first-child { color: var(--green); }
.article-main h1 { margin: 1.2rem 0 .8rem; font-family: var(--serif); font-size: clamp(2.8rem, 6vw, 5.1rem); font-weight: 400; letter-spacing: -.055em; line-height: 1.02; }
.article-deck { max-width: 660px; margin: 0; color: var(--body-copy); font-size: 1.12rem; }
.article-rule { height: 1px; margin: 2rem 0 2.3rem; background: var(--line); }
.article-body { font-size: 1rem; line-height: 1.8; }
.article-body h2 { margin: 2.6rem 0 .75rem; font-family: var(--serif); font-size: 1.8rem; font-weight: 400; letter-spacing: -.025em; line-height: 1.2; }
.article-body h3 { margin: 1.8rem 0 .45rem; font-size: 1.05rem; }
.article-body p { margin: 0 0 1.2rem; color: var(--body-copy); }
.article-body ul { padding-left: 1.3rem; color: var(--body-copy); }
.article-body li { padding-left: .2rem; margin: .35rem 0; }
.article-body a { color: var(--green); text-decoration-thickness: 1px; text-underline-offset: .17em; }
.article-body code { font-family: var(--mono); font-size: .83em; }
.article-body pre { overflow-x: auto; margin: 1.2rem 0; padding: 1.25rem 1.4rem; border-left: 3px solid var(--orange); background: #1d2a2d; color: var(--ink); font-family: var(--mono); font-size: .8rem; line-height: 1.65; }
.article-body pre code { color: var(--ink); font-size: inherit; }
.syntax-keyword { color: #569cd6; }
.syntax-type { color: #4ec9b0; }
.syntax-method { color: rgb(220, 220, 170); }
.syntax-string { color: #ce9178; }
.syntax-number { color: #b5cea8; }
.syntax-comment { color: #6a9955; font-style: italic; }
.article-aside { padding-top: 8rem; }
.aside-card { position: sticky; top: 2rem; padding: 1.2rem; border-top: 2px solid var(--green); background: rgba(24, 35, 38, .86); }
.aside-card .eyebrow { font-size: .61rem; }
.aside-card p { margin: .75rem 0 0; color: var(--muted); font-size: .77rem; line-height: 1.65; }
.article-figure { margin: 2rem 0; padding: 1.4rem; border: 1px solid var(--line); background: var(--paper-bright); }
.article-figure img { display: block; width: 100%; height: auto; }
.article-figure figcaption { margin-top: .8rem; color: var(--muted); font-size: .75rem; line-height: 1.55; }
.fact-box { margin: 1.4rem 0; padding: 1.25rem 1.4rem; border-left: 3px solid var(--green); background: var(--green-pale); }
.fact-box strong { display: block; margin-bottom: .35rem; font-family: var(--mono); font-size: .7rem; letter-spacing: .05em; text-transform: uppercase; }
.fact-box p:last-child { margin-bottom: 0; }
.matrix-wrap { overflow-x: auto; margin: 1.5rem 0; }
.matrix { width: 100%; border-collapse: collapse; font-size: .83rem; line-height: 1.5; }
.matrix th, .matrix td { padding: .75rem .65rem; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.matrix th { color: var(--green); font-family: var(--mono); font-size: .64rem; font-weight: 500; letter-spacing: .04em; text-transform: uppercase; }
.matrix td:first-child { white-space: nowrap; font-family: var(--mono); font-size: .77rem; }
.article-end { margin-top: 3rem; padding-top: 1.2rem; border-top: 1px solid var(--line); }
.article-end p { color: var(--muted); font-size: .85rem; }
.article-end a { color: var(--green); text-decoration: none; }
.post-nav { display: flex; justify-content: space-between; gap: 1rem; margin-top: 3rem; padding-top: 1.1rem; border-top: 1px solid var(--line); font-size: .76rem; }
.post-nav a { color: var(--green); text-decoration: none; }

@media (max-width: 720px) {
  .header-inner { width: min(100% - 2rem, 1100px); align-items: flex-start; flex-direction: column; gap: .5rem; padding: 1rem 0 .5rem; }
  .site-header nav { width: 100%; gap: 1.15rem; overflow-x: auto; }
  .site-header nav a { white-space: nowrap; }
  main { width: min(100% - 2rem, 1100px); }
  .hero-bottom, .section-heading { align-items: flex-start; flex-direction: column; }
  .hero-index { text-align: left; }
  .note-card { grid-template-columns: 2rem minmax(0, 1fr); gap: .7rem; padding: 1.6rem .4rem; }
  .note-glyph { display: none; }
  .milestone-list { grid-template-columns: 1fr; }
  .limits-list { grid-template-columns: 1fr; }
  .principles { grid-template-columns: 1fr; gap: 1.4rem; }
  .site-footer { align-items: flex-start; flex-direction: column; padding: 1.3rem 1rem; }
  .page-link { flex-wrap: wrap; }
  .article-shell { grid-template-columns: 1fr; gap: 1rem; padding-top: 3rem; }
  .article-aside { padding-top: 0; }
  .aside-card { position: static; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}