:root {
  --page-bg: #efebe3;
  --paper-bg: #fbf8f2;
  --panel-bg: #f6f1e8;
  --paper-border: #ddd5c8;
  --paper-shadow: rgba(52, 43, 33, 0.05);
  --ink: #201b17;
  --muted: #6f675e;
  --faint: #9a9186;
  --rule: #e4ddd2;
  --accent: #445258;
  --pill-bg: #f0ebe2;
  --inline-code-bg: #f2ede5;
  --selection: #dfd6ca;
  --body-font: New York, Iowan Old Style, Palatino Linotype, Book Antiqua, Georgia, ui-serif, serif;
  --mono-font: Berkeley Mono, SFMono-Regular, SF Mono, JetBrains Mono, IBM Plex Mono, ui-monospace, monospace;
  --ui-font: Inter, SF Pro Text, SF Pro Display, Segoe UI, Helvetica Neue, Arial, system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--page-bg);
  color: var(--ink);
  font-family: var(--body-font);
  font-size: 16px;
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body {
  margin: 0;
}

a,
a:visited {
  color: var(--accent);
}

::selection {
  background: var(--selection);
}

.page-shell {
  padding: 1.25rem 0.875rem 3rem;
}

.paper {
  width: min(100%, 78rem);
  margin: 0 auto;
  background: var(--paper-bg);
  border: 1px solid var(--paper-border);
  box-shadow: 0 10px 30px var(--paper-shadow);
  padding: 1.4rem 1.5rem 1.8rem;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--muted);
  text-decoration: none;
  font-family: var(--ui-font);
  font-size: 0.77rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.back-link::before {
  content: '←';
}

.back-link:hover {
  color: var(--ink);
}

.rfc-kicker {
  margin: 0;
  color: var(--muted);
  font-family: var(--ui-font);
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.kicker-link,
.kicker-link:visited {
  color: inherit;
  text-decoration: none;
}

.kicker-link:hover {
  color: var(--ink);
}

.kicker-separator {
  opacity: 0.65;
}

.index-header-list {
  margin-bottom: 1rem;
}

.index-eyebrow-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

.page-utility,
.page-auth {
  display: inline-flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.45rem;
  min-height: 1.5rem;
  min-width: 0;
  color: var(--muted);
  font-family: var(--ui-font);
  font-size: 0.77rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.page-utility {
  flex-wrap: wrap;
}

.auth-user {
  min-width: 0;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.auth-separator {
  color: var(--faint);
  letter-spacing: 0;
  margin-inline: 0.15rem;
}

.auth-link,
.auth-link:visited,
.source-link,
.source-link:visited {
  display: inline-flex;
  align-items: center;
  color: inherit;
  text-decoration: none;
  white-space: nowrap;
}

.auth-link:hover,
.source-link:hover {
  color: var(--ink);
}

.index-results-footer {
  margin-top: 1rem;
  color: var(--faint);
  font-family: var(--ui-font);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.index-header h1 {
  margin: 0;
  font-family: var(--ui-font);
  font-size: 1.55rem;
  line-height: 1.08;
  letter-spacing: -0.03em;
  font-weight: 550;
  text-wrap: balance;
}

.index-context {
  margin: 0.85rem 0 0;
}

.list-shell {
  margin-top: 1rem;
}

.list-head,
.index-link {
  display: grid;
  grid-template-columns: minmax(0, 2.1fr) 0.8fr 0.95fr minmax(0, 1.1fr);
  gap: 1rem;
  align-items: center;
}

.list-head {
  margin-bottom: 0.75rem;
  padding: 0.72rem 1rem;
  border: 1px solid var(--paper-border);
  background: var(--panel-bg);
  color: var(--faint);
  font-family: var(--ui-font);
  font-size: 0.69rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

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

.index-item + .index-item {
  margin-top: 0.75rem;
}

.index-link {
  padding: 0.9rem 1rem;
  border: 1px solid var(--paper-border);
  background: var(--paper-bg);
  color: inherit;
  text-decoration: none;
  transition: background-color 140ms ease, border-color 140ms ease, box-shadow 140ms ease;
}

.index-link-clickable {
  cursor: pointer;
}

.index-link-internal,
.index-link-confidential {
  background: #f7f2ea;
}

.index-link-confidential {
  background: #f6eee8;
}

.index-link:hover,
.index-link:focus-within,
.index-link-clickable:focus-visible {
  background: #f6f1e8;
  border-color: #cfc5b7;
  box-shadow: inset 0 0 0 1px rgba(207, 197, 183, 0.28);
}

.index-link-internal:hover,
.index-link-internal:focus-within,
.index-link-internal.index-link-clickable:focus-visible {
  background: #f2ebdf;
  border-color: #cabfae;
  box-shadow: inset 0 0 0 1px rgba(202, 191, 174, 0.26);
}

.index-link-confidential:hover,
.index-link-confidential:focus-within,
.index-link-confidential.index-link-clickable:focus-visible {
  background: #f3e7de;
  border-color: #d2bfae;
  box-shadow: inset 0 0 0 1px rgba(210, 191, 174, 0.28);
}

.index-col {
  min-width: 0;
}

.index-col-title {
  display: grid;
  gap: 0.18rem;
}

.index-number {
  color: var(--muted);
  font-family: var(--ui-font);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin-bottom: -0.05rem;
}

.index-content h2 {
  margin: 0;
  font-size: 1rem;
  line-height: 1.22;
  font-weight: 600;
}

.index-authors,
.index-col-updated,
.index-col-state,
.index-col-labels {
  color: var(--muted);
  font-family: var(--ui-font);
  font-size: 0.86rem;
  line-height: 1.4;
}

.index-authors a,
.index-authors a:visited,
.rfc-meta-row a,
.rfc-meta-row a:visited {
  color: inherit;
  text-decoration-color: color-mix(in srgb, var(--muted) 45%, transparent);
  text-underline-offset: 0.12em;
}

.index-authors a:hover,
.rfc-meta-row a:hover {
  color: var(--ink);
}

.index-col-updated time {
  display: block;
}

.index-col-labels {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  align-items: center;
}

.list-pill,
.keyword-tag,
.rfc-state-chip {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--paper-border);
  background: var(--pill-bg);
  color: var(--muted);
  font-family: var(--ui-font);
  font-size: 0.67rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  line-height: 1;
  padding: 0.28rem 0.42rem;
}

.list-pill-subtle {
  background: transparent;
}

.keyword-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.keyword-tag {
  color: var(--muted);
  text-decoration: none;
}

.keyword-tag:hover {
  color: var(--ink);
}

.index-empty {
  color: var(--muted);
  font-family: var(--ui-font);
}

.page-shell-rfc .paper {
  padding: 1.5rem 0 2rem;
}

.rfc-topline,
.rfc-hero,
.rfc-meta-rows,
.rfc-content-grid {
  width: min(100%, 72rem);
  margin-inline: auto;
  padding-inline: 1.5rem;
}

.rfc-topline {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.35rem;
}

.rfc-hero {
  display: grid;
  grid-template-columns: 9rem minmax(0, 1fr) auto;
  gap: 1.25rem;
  align-items: start;
  margin-bottom: 1.4rem;
}

.rfc-hero-number {
  color: var(--muted);
  font-family: var(--ui-font);
  font-size: 0.88rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding-top: 0.25rem;
}

.rfc-hero-main {
  min-width: 0;
}

.rfc-hero-main h1 {
  margin: 0.7rem 0 0;
  max-width: 19ch;
  font-family: var(--ui-font);
  font-size: clamp(2.2rem, 4vw, 3.55rem);
  line-height: 1.02;
  letter-spacing: -0.04em;
  font-weight: 550;
  text-wrap: balance;
}

.rfc-doc-link {
  justify-self: end;
  align-self: start;
  padding-top: 0.1rem;
}

.visibility-note {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  margin-top: 1rem;
  padding: 0.55rem 0.75rem;
  border: 1px solid #e3d7b5;
  background: #f7f0dd;
  color: #6e5b34;
  font-family: var(--ui-font);
  font-size: 0.9rem;
}

.visibility-note strong {
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.rfc-hero .keyword-tags {
  margin-top: 0.9rem;
}

.rfc-meta-rows {
  margin-bottom: 2rem;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

.rfc-meta-row {
  display: grid;
  grid-template-columns: 9rem minmax(0, 1fr);
  gap: 1.25rem;
  padding: 0.8rem 1.5rem;
  margin-inline: -1.5rem;
}

.rfc-meta-row + .rfc-meta-row {
  border-top: 1px solid var(--rule);
}

.rfc-meta-row dt {
  color: var(--faint);
  font-family: var(--ui-font);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.rfc-meta-row dd {
  margin: 0;
  font-family: var(--ui-font);
  font-size: 0.98rem;
  line-height: 1.5;
  color: var(--ink);
}

.rfc-content-grid {
  display: grid;
  grid-template-columns: minmax(0, 47rem) minmax(12rem, 14rem);
  justify-content: space-between;
  gap: 2.5rem;
  align-items: start;
}

.prose {
  min-width: 0;
  max-width: 47rem;
  color: var(--ink);
  font-size: 1.03rem;
  line-height: 1.78;
  text-wrap: pretty;
}

.prose > :first-child {
  margin-top: 0;
}

.prose > :last-child {
  margin-bottom: 0;
}

.prose > p:first-of-type {
  color: #312a24;
}

.prose p,
.prose ul,
.prose ol,
.prose blockquote,
.prose table,
.prose pre,
.prose hr {
  margin: 1.05rem 0;
}

.prose h2,
.prose h3,
.prose h4 {
  margin-top: 2.65rem;
  margin-bottom: 0.75rem;
  font-family: var(--ui-font);
  font-weight: 560;
  line-height: 1.1;
  letter-spacing: -0.032em;
  text-wrap: balance;
  scroll-margin-top: 1rem;
}

.prose h2 + *,
.prose h3 + *,
.prose h4 + * {
  margin-top: 0.75rem;
}

.prose h2 {
  font-size: 1.68rem;
}

.prose h3 {
  font-size: 1.26rem;
}

.prose h4 {
  font-size: 1.08rem;
}

.prose a,
.prose a:visited {
  color: var(--accent);
  text-decoration-thickness: 0.06em;
  text-underline-offset: 0.14em;
}

.prose a:hover {
  color: #2f3c42;
}

.prose strong {
  font-weight: 650;
}

.prose em {
  font-style: italic;
}

.prose code {
  font-family: var(--mono-font);
  font-size: 0.88em;
}

.prose :not(pre) > code {
  background: var(--inline-code-bg);
  border: 1px solid var(--rule);
  border-radius: 0.2rem;
  padding: 0.1rem 0.28rem;
}

.prose pre,
.prose .shiki {
  overflow-x: auto;
  border: 1px solid var(--paper-border);
  background: #f4efe6;
  padding: 0.95rem 1rem;
  font-family: var(--mono-font);
  font-size: 0.84rem;
  line-height: 1.62;
}

.prose .shiki {
  white-space: pre;
}

.prose .shiki code {
  display: block;
  font-family: inherit;
}

.prose blockquote {
  margin-left: 0;
  padding: 0.1rem 0 0.1rem 1rem;
  border-left: 3px solid #d7cfc2;
  color: #5e564d;
}

.prose blockquote > :first-child {
  margin-top: 0;
}

.prose blockquote > :last-child {
  margin-bottom: 0;
}

.prose ul,
.prose ol {
  padding-left: 1.45rem;
}

.prose ul {
  list-style-type: disc;
}

.prose ol {
  list-style-type: decimal;
}

.prose li {
  padding-left: 0.18rem;
}

.prose li + li {
  margin-top: 0.42rem;
}

.prose li > p {
  margin: 0.35rem 0;
}

.prose li > ul,
.prose li > ol {
  margin-top: 0.55rem;
  margin-bottom: 0.55rem;
}

.prose ul > li::marker,
.prose ol > li::marker {
  color: var(--muted);
}

.prose p + ul,
.prose p + ol,
.prose ul + p,
.prose ol + p,
.prose blockquote + p,
.prose p + blockquote {
  margin-top: 0.95rem;
}

.prose hr {
  border: 0;
  border-top: 1px solid var(--rule);
  margin: 1.85rem 0;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--ui-font);
  font-size: 0.92rem;
  line-height: 1.55;
}

.prose th,
.prose td {
  padding: 0.62rem 0.7rem;
  vertical-align: top;
  border-top: 1px solid var(--rule);
}

.prose thead th {
  text-align: left;
  color: var(--muted);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border-top: 0;
  border-bottom: 1px solid var(--paper-border);
}

.prose tbody tr:last-child td {
  border-bottom: 1px solid var(--rule);
}

.prose img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 2rem auto;
  border: 1px solid var(--paper-border);
}

.rfc-toc {
  position: sticky;
  top: 1rem;
  border-left: 1px solid var(--rule);
  padding-left: 1rem;
  color: var(--muted);
  font-family: var(--ui-font);
  font-size: 0.84rem;
}

.rfc-toc-title {
  margin-bottom: 0.75rem;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.rfc-toc ol {
  list-style: none;
  margin: 0;
  padding: 0;
}

.rfc-toc li + li {
  margin-top: 0.5rem;
}

.rfc-toc li.toc-level-2 {
  padding-left: 0.75rem;
}

.rfc-toc li.toc-level-3 {
  padding-left: 1.4rem;
}

.rfc-toc li.toc-level-4 {
  padding-left: 2rem;
}

.rfc-toc a {
  color: inherit;
  text-decoration: none;
  line-height: 1.42;
}

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

@media (max-width: 920px) {
  .list-head,
  .index-link {
    grid-template-columns: minmax(0, 1.6fr) 0.8fr 0.9fr;
  }

  .list-head > :last-child,
  .index-col-labels {
    display: none;
  }

  .rfc-content-grid {
    grid-template-columns: 1fr;
  }

  .rfc-toc {
    display: none;
  }
}

@media (max-width: 720px) {
  html {
    font-size: 15px;
  }

  .page-shell {
    padding: 0.5rem 0.4rem 1.5rem;
  }

  .paper {
    padding: 1rem;
    box-shadow: none;
  }

  .index-eyebrow-row,
  .rfc-topline {
    flex-direction: column;
    align-items: flex-start;
  }

  .page-utility,
  .page-auth {
    justify-content: flex-start;
  }

  .list-head {
    display: none;
  }

  .index-link {
    grid-template-columns: 1fr;
    gap: 0.7rem;
  }

  .rfc-topline,
  .rfc-hero,
  .rfc-meta-rows,
  .rfc-content-grid {
    width: 100%;
    padding-inline: 0;
  }

  .rfc-hero,
  .rfc-meta-row {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }

  .rfc-doc-link {
    justify-self: start;
    padding-top: 0;
  }

  .rfc-hero-main h1 {
    max-width: none;
    font-size: clamp(2rem, 10vw, 2.9rem);
  }

  .rfc-meta-row {
    padding: 0.75rem 0;
    margin-inline: 0;
  }

  .prose {
    font-size: 1rem;
  }

}