:root {
  color-scheme: light;
  --page: #e7e1d7;
  --paper: #fdfbf6;
  --ink: #1d2126;
  --muted: #55606a;
  --line: #d6cdbf;
  --line-strong: #b3a691;
  --link: #173f6d;
  --accent: #726556;
  --shadow: rgba(40, 38, 32, 0.08);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--page);
  color: var(--ink);
}

body {
  font-family: "Source Serif 4", "Georgia", "Times New Roman", serif;
  line-height: 1.65;
}

a {
  color: var(--link);
  text-decoration: underline;
  text-underline-offset: 0.14em;
}

a:hover {
  color: #0d3159;
}

code,
pre {
  font-family: "Consolas", "Courier New", monospace;
}

code {
  font-size: 0.94em;
}

.paper {
  width: min(1040px, calc(100% - 32px));
  margin: 26px auto;
  padding: 34px 78px 72px;
  background: var(--paper);
  border: 1px solid var(--line);
  box-shadow: 0 18px 40px var(--shadow);
}

.paper-header {
  padding-bottom: 34px;
  border-bottom: 1px solid var(--line-strong);
}

.edition-line {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-family: "Segoe UI", Arial, sans-serif;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.masthead-note {
  margin: 18px 0 12px;
  font-family: "Segoe UI", Arial, sans-serif;
  font-size: 0.82rem;
  color: var(--muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin: 0;
  font-weight: 700;
  letter-spacing: 0;
}

h1 {
  max-width: 12ch;
  font-size: clamp(2.5rem, 4.6vw, 4.1rem);
  line-height: 0.98;
}

h2 {
  margin-bottom: 0;
  font-size: 1.65rem;
  line-height: 1.2;
}

h3 {
  margin-bottom: 12px;
  font-size: 1rem;
  line-height: 1.3;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.paper-subtitle {
  max-width: 44rem;
  margin: 22px 0 0;
  font-size: 1.14rem;
  line-height: 1.6;
  color: var(--muted);
}

.byline-row {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: baseline;
  margin: 20px 0 0;
}

.byline,
.publication-note {
  margin: 0;
  font-size: 0.96rem;
  color: var(--muted);
}

.byline {
  font-style: italic;
}

.publication-note {
  font-family: "Segoe UI", Arial, sans-serif;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.paper-section {
  padding-top: 34px;
}

.paper-section + .paper-section {
  border-top: 1px solid var(--line);
  margin-top: 34px;
}

p {
  margin: 0 0 15px;
  max-width: 46rem;
  font-size: 1.04rem;
  line-height: 1.8;
  color: var(--ink);
  text-wrap: pretty;
}

.lede {
  font-size: 1.08rem;
}

.lede::first-letter {
  float: left;
  margin: 0.08em 0.12em 0 0;
  font-size: 4.2rem;
  line-height: 0.85;
  font-weight: 700;
}

.header-meta,
.branch-list {
  margin: 28px 0 0;
  display: grid;
  gap: 16px;
}

.header-meta {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.header-meta div,
.branch-list div {
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

dt {
  margin: 0;
  font-family: "Segoe UI", Arial, sans-serif;
  font-size: 0.77rem;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

dd {
  margin: 6px 0 0;
  color: var(--ink);
  line-height: 1.6;
}

.branch-list dt a {
  font-family: "Consolas", "Courier New", monospace;
  font-size: 0.96rem;
}

.section-heading {
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 14px;
  align-items: end;
  margin-bottom: 18px;
}

.section-number {
  display: inline-block;
  padding-top: 0.18rem;
  font-family: "Segoe UI", Arial, sans-serif;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.08em;
}

.plain-list,
.reference-list,
.path-list {
  margin: 0;
  padding-left: 1.45rem;
}

.plain-list li,
.reference-list li,
.path-list li {
  margin-bottom: 12px;
  max-width: 46rem;
  line-height: 1.75;
}

.catalog-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  margin-top: 6px;
}

.catalog-grid > div {
  padding: 0 18px 0 0;
  border-right: 1px solid var(--line);
  background: transparent;
}

.catalog-grid > div:last-child {
  border-right: 0;
  padding-right: 0;
}

.validation-sheet {
  margin: 28px 0 0;
}

.validation-sheet-inner {
  padding: 40px 40px 36px;
  border: 1px solid var(--line);
  background: #fdfbf6;
}

.validation-sheet-head {
  max-width: 48rem;
}

.validation-figure-label {
  margin: 0;
  font-family: "Segoe UI", Arial, sans-serif;
  font-size: 0.9rem;
  color: var(--link);
}

.validation-rule {
  width: 270px;
  max-width: 100%;
  height: 3px;
  margin: 14px 0 18px;
  background: #2f5a54;
}

.validation-title {
  margin: 0;
  font-size: clamp(2rem, 3.2vw, 3rem);
  line-height: 1.06;
  text-transform: none;
  letter-spacing: 0;
}

.validation-subtitle {
  max-width: 52rem;
  margin: 18px 0 0;
  font-size: 1.02rem;
  line-height: 1.7;
  color: var(--muted);
}

.validation-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(250px, 0.62fr);
  gap: 38px;
  align-items: start;
  margin-top: 46px;
}

.validation-main {
  min-width: 0;
}

.validation-terminal {
  margin: 0;
  padding: 32px 34px;
  overflow-x: auto;
  border: 1px solid var(--line);
  background: #f1ede4;
  color: #183049;
  font-size: 0.98rem;
  line-height: 1.75;
}

.validation-note {
  max-width: 44rem;
  margin-top: 28px;
}

.validation-note-label {
  margin: 0 0 10px;
  font-family: "Segoe UI", Arial, sans-serif;
  font-size: 0.92rem;
  color: var(--link);
}

.validation-note p:last-child {
  margin-bottom: 0;
  color: var(--muted);
}

.validation-meta {
  margin: 0;
  display: grid;
  gap: 20px;
}

.validation-meta div {
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.validation-meta dt {
  margin-bottom: 6px;
  font-size: 0.76rem;
  color: var(--muted);
}

.validation-meta dd {
  margin: 0;
  font-size: 1rem;
  line-height: 1.45;
  word-break: break-word;
}

@media (max-width: 820px) {
  .paper {
    width: calc(100% - 20px);
    max-width: 980px;
    margin: 10px auto;
    padding: 24px 20px 36px;
    overflow: hidden;
  }

  .edition-line,
  .byline-row,
  .header-meta,
  .catalog-grid,
  .validation-layout {
    display: grid;
    grid-template-columns: 1fr;
  }

  .validation-sheet-inner {
    padding: 24px 20px 24px;
  }

  .validation-title {
    font-size: 1.8rem;
  }

  .validation-terminal {
    padding: 22px 18px;
  }

  h1 {
    font-size: 2.15rem;
    line-height: 1.02;
  }

  p,
  dd,
  li {
    max-width: 100%;
    overflow-wrap: break-word;
  }

  .paper-subtitle,
  .byline,
  .publication-note,
  .validation-subtitle {
    max-width: 100%;
  }

  .validation-terminal {
    white-space: pre-wrap;
    word-break: break-word;
  }

  .section-heading {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .section-number {
    padding-top: 0;
  }

  .lede::first-letter {
    font-size: 3.4rem;
  }
}