:root {
  --paper: #f1eee6;
  --ink: #151515;
  --muted: #69665f;
  --rule: rgba(21, 21, 21, 0.22);
  --serif: Baskerville, "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  --sans: "Helvetica Neue", Helvetica, Arial, sans-serif;
  --display: "Newsreader", Georgia, serif;
}

@font-face {
  font-family: "Newsreader";
  src: url("fonts/newsreader-regular.woff2") format("woff2");
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--serif);
  text-rendering: optimizeLegibility;
}

a {
  color: inherit;
}

.skip-link {
  position: fixed;
  top: -5rem;
  left: 1rem;
  z-index: 10;
  padding: 0.75rem 1rem;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--sans);
}

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

.reader-header {
  width: min(88vw, 76rem);
  margin: 0 auto;
  padding: 2.5rem 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--rule);
}

.reader-mark img {
  display: block;
  width: 7.5rem;
  height: auto;
}

.reader-return {
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.58rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-decoration: none;
  text-transform: uppercase;
}

.reader-return:hover,
.reader-return:focus-visible,
.reader-footer a:hover,
.reader-footer a:focus-visible {
  color: var(--ink);
}

.title-page {
  width: min(82vw, 56rem);
  min-height: calc(100svh - 7.5rem);
  margin: 0 auto;
  padding: 10svh 0 14svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  border-bottom: 1px solid var(--rule);
}

.publisher,
.subtitle {
  margin: 0;
}

.publisher {
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.24em;
}

.title-page h1 {
  margin: 1.75rem 0 2rem;
  font-family: var(--display);
  font-size: clamp(4.25rem, 10vw, 8.5rem);
  font-weight: 400;
  letter-spacing: -0.055em;
  line-height: 0.88;
}

.subtitle {
  color: #393733;
  font-size: clamp(1.15rem, 2vw, 1.5rem);
  font-style: italic;
}

.charter {
  width: min(82vw, 43rem);
  margin: 0 auto;
  padding: clamp(7rem, 13vw, 12rem) 0;
}

.chapter + .chapter {
  margin-top: clamp(10rem, 18vw, 16rem);
  padding-top: clamp(7rem, 12vw, 10rem);
  border-top: 1px solid var(--rule);
}

.chapter-title {
  margin: 0 0 clamp(5rem, 9vw, 8rem);
  font-family: var(--display);
  font-size: clamp(3.5rem, 8vw, 6.5rem);
  font-weight: 400;
  letter-spacing: -0.05em;
  line-height: 0.92;
}

.charter-section + .charter-section {
  margin-top: clamp(5rem, 9vw, 8rem);
}

.charter-section[aria-labelledby="technical-consulting"] {
  padding-top: clamp(5rem, 9vw, 8rem);
}

.charter h3 {
  margin: 0 0 2rem;
  font-size: clamp(2.1rem, 4.7vw, 3.4rem);
  font-weight: 400;
  letter-spacing: -0.035em;
  line-height: 1.02;
}

.charter h4 {
  margin: 4.75rem 0 1.4rem;
  font-family: var(--sans);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.charter p {
  margin: 0;
  font-size: clamp(1.04rem, 1.55vw, 1.16rem);
  line-height: 1.88;
}

.charter p + p {
  margin-top: 2.1rem;
}

.major-section {
  padding-top: clamp(6rem, 11vw, 9rem);
  border-top: 1px solid var(--rule);
}

.section-introduction {
  margin-bottom: 5rem !important;
  color: #35332f;
  font-size: clamp(1.2rem, 2vw, 1.45rem) !important;
  line-height: 1.72 !important;
}

.closing-words {
  position: relative;
  left: 50%;
  width: min(92vw, 78rem);
  margin-top: clamp(10rem, 18vw, 16rem);
  padding-top: clamp(6rem, 10vw, 9rem);
  border-top: 1px solid var(--rule);
  text-align: center;
  transform: translateX(-50%);
}

.closing-words p {
  margin: 0;
  font-family: var(--display);
  font-size: clamp(2.25rem, 5.5vw, 4.5rem);
  letter-spacing: -0.04em;
  line-height: 1.02;
  white-space: nowrap;
}

.closing-words p + p {
  margin-top: 1.25rem;
}

.reader-footer {
  width: min(88vw, 76rem);
  margin: 0 auto;
  padding: 3rem 0 4rem;
  border-top: 1px solid var(--rule);
  color: var(--muted);
  font-family: var(--sans);
  font-size: 0.56rem;
  letter-spacing: 0.08em;
  line-height: 1.7;
  text-align: center;
}

.reader-footer a {
  display: inline-block;
  margin-bottom: 2rem;
  color: var(--muted);
  font-weight: 600;
  letter-spacing: 0.18em;
  text-decoration: none;
  text-transform: uppercase;
}

.reader-footer p {
  margin: 0;
}

@media (max-width: 640px) {
  .reader-header {
    padding: 1.5rem 0;
  }

  .reader-mark img {
    width: 6rem;
  }

  .reader-return {
    font-size: 0.5rem;
    letter-spacing: 0.12em;
  }

  .title-page {
    min-height: calc(100svh - 5.5rem);
  }

  .charter {
    width: min(86vw, 43rem);
  }
}

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