/* ietf-corpus stylesheet. Serif + mono pairing tipping the hat to
   the RFC typewriter heritage; warm-paper background with ink-blue
   accents that fades to a softer dark mode at night. */

@import url('https://fonts.googleapis.com/css2?family=EB+Garamond:ital,wght@0,400;0,600;1,400&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --paper: #f3ede0;
  --paper-deep: #e7dfcc;
  --ink: #16213a;
  --ink-soft: #3a4564;
  --rule: #c9bea6;
  --accent: #b8500e;
  --accent-soft: #d97a3a;
  --warning: #8a1f1f;
  --rfc: #16213a;
  --draft: #6b3a18;
  --mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --serif: 'EB Garamond', Georgia, 'Times New Roman', serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #181a1f;
    --paper-deep: #0f1116;
    --ink: #e8e1d0;
    --ink-soft: #aea798;
    --rule: #3c3a36;
    --accent: #e88a3a;
    --accent-soft: #f0a060;
    --warning: #f06060;
    --rfc: #b3c7ec;
    --draft: #f0a060;
  }
}

* { box-sizing: border-box; }

html { font-size: 17px; }

body {
  font-family: var(--serif);
  background: var(--paper);
  color: var(--ink);
  margin: 0;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

main {
  max-width: 920px;
  margin: 0 auto;
  padding: 3rem 2rem 6rem;
}

header.site {
  border-bottom: 1px solid var(--rule);
  background: var(--paper-deep);
  padding: 1rem 2rem;
}

header.site .inner {
  max-width: 920px;
  margin: 0 auto;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 2rem;
}

header.site .brand {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  white-space: nowrap;
}

header.site .wordmark {
  font-size: 1.4rem;
  font-style: italic;
  font-weight: 400;
  letter-spacing: 0.02em;
  color: var(--ink);
  border: none;
}

header.site .from {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  color: var(--ink-soft);
  border: none;
}

header.site .from:hover { color: var(--accent); }

header.site nav {
  font-family: var(--mono);
  font-size: 0.85rem;
}

header.site nav a {
  margin-left: 1.5rem;
  color: var(--ink-soft);
  text-decoration: none;
}

header.site nav a:hover { color: var(--accent); }

h1, h2, h3, h4 {
  font-weight: 600;
  letter-spacing: -0.01em;
}

h1.hero {
  font-size: 3.2rem;
  font-weight: 400;
  font-style: italic;
  line-height: 1.05;
  margin: 0 0 1rem;
}

h1.hero .accent {
  color: var(--accent);
  font-style: normal;
  font-family: var(--mono);
  font-size: 0.7em;
  font-weight: 500;
  display: inline-block;
  transform: translateY(-0.3em);
}

.lede {
  font-size: 1.2rem;
  color: var(--ink-soft);
  max-width: 38em;
  margin-bottom: 2.5rem;
}

h2 { font-size: 1.6rem; margin-top: 3rem; margin-bottom: 0.8rem; }
h3 { font-size: 1.2rem; margin-top: 1.8rem; margin-bottom: 0.4rem; }

a { color: var(--accent); text-decoration: none; border-bottom: 1px solid transparent; transition: border-color 0.15s; }
a:hover { border-color: var(--accent); }

code, pre, .mono { font-family: var(--mono); font-size: 0.9em; }

pre {
  background: var(--paper-deep);
  padding: 1rem 1.2rem;
  border-radius: 4px;
  border: 1px solid var(--rule);
  overflow-x: auto;
  line-height: 1.4;
  font-size: 0.85rem;
}

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0;
  margin: 3rem 0;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}

.stat {
  padding: 1.2rem 1.4rem;
  border-right: 1px solid var(--rule);
}

.stat:last-child { border-right: none; }

.stat .v {
  font-family: var(--mono);
  font-size: 1.8rem;
  font-weight: 500;
  color: var(--accent);
  display: block;
  line-height: 1;
}

.stat .l {
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin-top: 0.4rem;
  text-transform: lowercase;
  letter-spacing: 0.04em;
}

.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  margin: 2rem 0;
}

@media (max-width: 700px) {
  .two-col { grid-template-columns: 1fr; }
  h1.hero { font-size: 2.4rem; }
  main { padding: 2rem 1rem 4rem; }
  header.site { padding: 0.9rem 1rem; }
  header.site .inner { flex-wrap: wrap; gap: 0.4rem 1rem; }
  header.site nav a { margin: 0 1rem 0 0; }
  footer { padding: 2rem 1rem; }
  .doc-header h1 { font-size: 1.7rem; overflow-wrap: anywhere; }
  .doc-meta { grid-template-columns: max-content minmax(0, 1fr); overflow-wrap: anywhere; }
}

.from-line {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--ink-soft);
  letter-spacing: 0.03em;
  margin: -1.5rem 0 2.5rem;
}

/* FAQ */

.faq { border-top: 1px solid var(--rule); }
.faq .qa { padding: 1.1rem 0 1.2rem; border-bottom: 1px dotted var(--rule); }
.faq h3 { margin: 0 0 0.4rem; font-size: 1.15rem; }
.faq h3::before {
  content: "Q";
  font-family: var(--mono);
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: 0.05em;
  margin-right: 0.7rem;
  vertical-align: 0.15em;
}
.faq p { margin: 0; color: var(--ink-soft); max-width: 42em; }
.faq code { overflow-wrap: anywhere; }

.bucket h3 { margin-top: 0; font-size: 1rem; color: var(--ink-soft); text-transform: lowercase; letter-spacing: 0.04em; font-weight: 500; }
.bucket ul { list-style: none; padding: 0; margin: 0; font-family: var(--mono); font-size: 0.85rem; }
.bucket li { display: flex; justify-content: space-between; padding: 0.2rem 0; border-bottom: 1px dotted var(--rule); }
.bucket li .n { color: var(--ink-soft); }

.featured {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}

.card {
  border: 1px solid var(--rule);
  background: var(--paper-deep);
  padding: 1rem 1.2rem;
  border-radius: 4px;
  transition: border-color 0.15s, transform 0.15s;
}

.card:hover { border-color: var(--accent); transform: translateY(-2px); }

.card .id {
  font-family: var(--mono);
  font-size: 0.75rem;
  color: var(--accent);
  letter-spacing: 0.05em;
}

.card .t {
  font-size: 1.05rem;
  margin: 0.3rem 0 0.5rem;
  font-weight: 600;
}

.card .meta {
  font-family: var(--mono);
  font-size: 0.72rem;
  color: var(--ink-soft);
  letter-spacing: 0.04em;
}

/* Document page */

.doc-header { border-bottom: 1px solid var(--rule); padding-bottom: 1.5rem; margin-bottom: 2rem; }

.doc-header .id-pill {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.78rem;
  background: var(--rfc);
  color: var(--paper);
  padding: 0.2rem 0.55rem;
  border-radius: 2px;
  letter-spacing: 0.05em;
}

.doc-header .id-pill.draft { background: var(--draft); }

.doc-header h1 {
  font-size: 2.2rem;
  font-weight: 400;
  font-style: italic;
  margin: 0.4rem 0 0.8rem;
  line-height: 1.15;
}

.doc-header .authors {
  font-style: italic;
  color: var(--ink-soft);
}

.doc-meta {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 0.4rem 1.5rem;
  margin: 1rem 0 0;
  font-family: var(--mono);
  font-size: 0.85rem;
}

.doc-meta .k { color: var(--ink-soft); letter-spacing: 0.03em; }

.abstract {
  font-size: 1.05rem;
  line-height: 1.6;
  margin: 2rem 0;
  padding: 1rem 0 1rem 1.5rem;
  border-left: 3px solid var(--accent-soft);
  color: var(--ink-soft);
}

.relations {
  margin-top: 2rem;
}

.relations h3 {
  font-size: 0.9rem;
  text-transform: lowercase;
  letter-spacing: 0.05em;
  color: var(--ink-soft);
  font-weight: 500;
  margin-top: 1.5rem;
}

.relations ul { font-family: var(--mono); font-size: 0.85rem; list-style: none; padding: 0; }
.relations li { padding: 0.2rem 0; }

.elements { margin-top: 2.5rem; }
.element { border-left: 2px solid var(--rule); padding: 0.4rem 0 0.4rem 1rem; margin: 0.8rem 0; }
.element .kind {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--accent);
  text-transform: lowercase;
  letter-spacing: 0.06em;
}
.element .kind.normative-requirement { color: var(--accent); }
.element .section { color: var(--ink-soft); font-family: var(--mono); font-size: 0.78rem; }
.element .rfc2119 {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.72rem;
  background: var(--accent);
  color: var(--paper);
  padding: 0.1rem 0.4rem;
  border-radius: 2px;
  margin-left: 0.4rem;
}
.element .s { margin: 0.3rem 0 0; }

/* Browse page */

.browse-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 1.5rem 0;
  padding: 1rem;
  background: var(--paper-deep);
  border: 1px solid var(--rule);
  border-radius: 4px;
}

.browse-controls input, .browse-controls select {
  font-family: var(--mono);
  font-size: 0.85rem;
  background: var(--paper);
  color: var(--ink);
  border: 1px solid var(--rule);
  padding: 0.4rem 0.6rem;
  border-radius: 2px;
}

.browse-controls input { flex: 1; min-width: 200px; }

#results {
  border-top: 1px solid var(--rule);
  margin-top: 1rem;
}

.result {
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--rule);
  display: grid;
  grid-template-columns: max-content 1fr max-content;
  gap: 1rem;
  align-items: baseline;
}

.result .id {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--accent);
  min-width: 11ch;
}

.result .t { color: var(--ink); }
.result .t a { color: var(--ink); border-bottom-color: var(--rule); }
.result .t a:hover { color: var(--accent); border-bottom-color: var(--accent); }

.result .m { font-family: var(--mono); font-size: 0.72rem; color: var(--ink-soft); letter-spacing: 0.04em; }

#count { font-family: var(--mono); font-size: 0.85rem; color: var(--ink-soft); }

@media (max-width: 700px) {
  .result { grid-template-columns: minmax(0, 1fr); gap: 0.15rem; overflow-wrap: anywhere; }
  .result .id { min-width: 0; }
}

/* Taxonomy */

.tax-section { margin: 2rem 0; }
.tax-section h2 { border-bottom: 1px solid var(--rule); padding-bottom: 0.3rem; }
.tax-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 0.4rem 1.5rem; font-family: var(--mono); font-size: 0.85rem; }
.tax-grid .k { color: var(--accent); }
.tax-grid .v { color: var(--ink-soft); font-size: 0.78rem; }

/* Ask page */

.hero-ask {
  display: flex;
  gap: 0.6rem;
  margin: 1.5rem 0 0.8rem;
  align-items: stretch;
}

.hero-ask input {
  flex: 1;
  font-family: var(--serif);
  font-size: 1.1rem;
  font-style: italic;
  background: var(--paper-deep);
  color: var(--ink);
  border: 1px solid var(--rule);
  padding: 0.7rem 1rem;
  border-radius: 4px;
  outline: none;
  transition: border-color 0.15s;
}

.hero-ask input:focus {
  border-color: var(--accent);
}

.hero-ask button {
  font-family: var(--mono);
  font-size: 0.9rem;
  background: var(--accent);
  color: var(--paper);
  border: none;
  padding: 0 1.5rem;
  border-radius: 4px;
  cursor: pointer;
  letter-spacing: 0.05em;
  transition: background 0.15s;
}

.hero-ask button:hover { background: var(--accent-soft); }
.hero-ask button:disabled { background: var(--ink-soft); cursor: wait; }

.ask-help {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-soft);
  margin: 0 0 2rem;
}

.ask-status {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--ink-soft);
  margin: 1rem 0;
  min-height: 1.3em;
}

.ask-answer p {
  font-size: 1.1rem;
  line-height: 1.6;
  margin: 0 0 1rem;
}

.ask-answer code {
  background: var(--paper-deep);
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
  font-size: 0.88em;
}

.ask-bundle {
  margin-top: 2rem;
  border-top: 1px solid var(--rule);
  padding-top: 1rem;
}

.ask-bundle summary {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--ink-soft);
  cursor: pointer;
  letter-spacing: 0.03em;
}

.ask-bundle summary:hover { color: var(--accent); }

.bundle-list {
  font-family: var(--mono);
  font-size: 0.82rem;
  list-style: none;
  padding: 0;
  margin: 0.5rem 0;
}

.bundle-list li {
  padding: 0.3rem 0;
  border-bottom: 1px dotted var(--rule);
  line-height: 1.5;
}

.bundle-list .kind {
  color: var(--accent);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
}

.ask-bundle h4 {
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-soft);
  text-transform: lowercase;
  letter-spacing: 0.05em;
  margin: 1.2rem 0 0.4rem;
  font-weight: 500;
}

/* Footer */

footer {
  max-width: 920px;
  margin: 4rem auto 0;
  padding: 2rem;
  border-top: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 0.78rem;
  color: var(--ink-soft);
}

footer .more-h {
  font-size: 0.78rem;
  text-transform: lowercase;
  letter-spacing: 0.05em;
  margin: 0 0 0.8rem;
}

.sisters {
  list-style: none;
  padding: 0;
  margin: 0 0 2rem;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 0.7rem 2rem;
}

.sisters li { line-height: 1.4; }
.sisters a { display: block; font-family: var(--serif); font-size: 1rem; font-weight: 600; border: none; }
.sisters a:hover { text-decoration: underline; }
.sisters span { font-size: 0.74rem; }

footer .colophon { margin: 0; line-height: 1.8; border-top: 1px dotted var(--rule); padding-top: 1.2rem; }