:root {
  --paper: #f4f8f7;
  --panel: #ffffff;
  --ink: #112033;
  --muted: #5e6e7b;
  --rule: #c9d7db;
  --soft-rule: #e0eaec;
  --protocol: #dbeaf3;
  --teal: #1f756f;
  --copper: #b77436;
  --rose: #c5576b;
  --shadow: rgba(17, 32, 51, 0.09);
  --mono: Menlo, Monaco, 'SFMono-Regular', 'Cascadia Code', 'Andale Mono', monospace;
  --sans: Inter, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

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

a { color: inherit; }

.schema-home,
.schema-article-shell {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

.protocol-masthead {
  padding: 28px 0 44px;
}

.namespace-line {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-bottom: 22px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.namespace-line span {
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 7px 10px;
  background: var(--panel);
}

.masthead-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 330px;
  gap: 28px;
  align-items: stretch;
}

.masthead-copy {
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 30px;
  padding: clamp(28px, 5vw, 58px);
  box-shadow: 0 24px 60px var(--shadow);
  position: relative;
  overflow: hidden;
}

.masthead-copy::before,
.masthead-copy::after {
  content: '';
  position: absolute;
  width: 14px;
  height: 14px;
  border: 2px solid var(--copper);
  border-radius: 50%;
  top: 24px;
}

.masthead-copy::before { right: 58px; }
.masthead-copy::after { right: 30px; }

.hero-kicker,
.section-label,
.rail-label,
.cassette-meta,
.plate-code,
.namespace-mark {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero-kicker,
.section-label,
.namespace-mark { color: var(--teal); }

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.05;
}

.protocol-masthead h1 {
  max-width: 820px;
  margin-top: 18px;
  font-family: var(--mono);
  font-size: clamp(44px, 8vw, 94px);
  letter-spacing: -0.08em;
  font-weight: 800;
}

.hero-dek {
  max-width: 740px;
  margin: 24px 0 0;
  color: #27394b;
  font-size: clamp(18px, 2vw, 24px);
  line-height: 1.45;
}

.byline {
  margin: 28px 0 0;
  color: var(--muted);
}

.byline strong { color: var(--ink); }

.entity-terminal {
  min-height: 360px;
  border: 1px solid var(--rule);
  border-radius: 30px;
  background: var(--protocol);
  padding: 22px;
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  grid-auto-rows: minmax(32px, auto);
  gap: 10px;
  align-content: center;
  box-shadow: inset 0 0 0 10px rgba(255,255,255,0.35);
}

.entity-terminal span,
.feature-socket span,
.cassette-terminals span {
  display: block;
  width: 100%;
  aspect-ratio: 1;
  border: 2px solid var(--copper);
  border-radius: 50%;
  background: var(--panel);
}

.entity-terminal b {
  grid-column: 1 / -1;
  border: 2px solid var(--teal);
  border-radius: 18px;
  padding: 18px;
  text-align: center;
  font-family: var(--mono);
  font-size: 24px;
  letter-spacing: -0.04em;
  background: var(--panel);
}

.entity-terminal i {
  grid-column: span 3;
  border: 1px solid var(--rule);
  border-radius: 14px;
  padding: 10px;
  background: rgba(255,255,255,0.72);
  font-family: var(--mono);
  font-style: normal;
  font-size: 12px;
  text-align: center;
  color: var(--muted);
}

.topic-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.topic-strip a,
.topic-strip span {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--rule);
  border-radius: 12px;
  padding: 8px 11px;
  background: var(--panel);
  color: var(--muted);
  font-family: var(--mono);
  font-size: 12px;
  text-decoration: none;
}

.binding-sequence,
.featured-binding,
.ambiguity-breaker,
.post-archive {
  margin: 24px 0;
}

.binding-sequence {
  padding: 30px;
  border: 1px solid var(--rule);
  border-radius: 28px;
  background: #edf5f5;
}

.binding-sequence h2,
.ambiguity-breaker h2,
.archive-heading-row h2 {
  margin-top: 10px;
  font-family: var(--mono);
  font-size: clamp(28px, 4vw, 48px);
  letter-spacing: -0.07em;
}

.contact-plates {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  margin-top: 24px;
}

.contact-plates article {
  background: var(--panel);
  border: 1px solid var(--rule);
  border-radius: 22px;
  padding: 20px;
  position: relative;
}

.contact-plates article::after {
  content: '';
  position: absolute;
  right: 16px;
  top: 16px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  border: 2px solid var(--copper);
}

.plate-code {
  color: var(--rose);
}

.contact-plates h3 {
  margin-top: 22px;
  font-family: var(--mono);
  letter-spacing: -0.05em;
  font-size: 22px;
}

.contact-plates p,
.featured-binding p,
.ambiguity-breaker p,
.binding-cassette p { color: var(--muted); }

.featured-binding {
  display: grid;
  grid-template-columns: 140px 1fr;
  gap: 24px;
  align-items: stretch;
  padding: 28px;
  border: 1px solid var(--rule);
  border-radius: 30px;
  background: var(--panel);
  box-shadow: 0 18px 50px var(--shadow);
}

.featured-binding h2 {
  margin-top: 10px;
  font-family: var(--mono);
  font-size: clamp(30px, 5vw, 58px);
  letter-spacing: -0.08em;
}

.featured-binding p:last-child {
  max-width: 760px;
  font-size: 18px;
}

.feature-socket {
  border: 1px solid var(--rule);
  border-radius: 22px;
  background: var(--protocol);
  padding: 18px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  align-content: center;
}

.ambiguity-breaker {
  border-left: 6px solid var(--rose);
  padding: 8px 0 8px 24px;
}

.ambiguity-breaker p {
  max-width: 820px;
  font-size: 18px;
}

.archive-heading-row {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: end;
  margin-bottom: 16px;
}

.binding-cassette-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.binding-cassette {
  min-height: 100%;
}

.cassette-link {
  display: flex;
  flex-direction: column;
  min-height: 100%;
  padding: 18px;
  border: 1px solid var(--rule);
  border-radius: 24px;
  background: var(--panel);
  text-decoration: none;
  box-shadow: 0 10px 28px rgba(17, 32, 51, 0.06);
  position: relative;
  transition: transform 160ms ease, border-color 160ms ease;
}

.cassette-link:hover {
  transform: translateY(-3px);
  border-color: var(--teal);
}

.cassette-link::after {
  content: '';
  position: absolute;
  right: 18px;
  bottom: 18px;
  width: 28px;
  height: 12px;
  border-right: 3px solid var(--rose);
  border-bottom: 3px solid var(--rose);
}

.cassette-terminals {
  display: grid;
  grid-template-columns: repeat(5, 18px);
  gap: 7px;
  margin-bottom: 18px;
}

.cassette-meta {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  color: var(--muted);
}

.binding-cassette h2 {
  margin-top: 18px;
  font-family: var(--mono);
  font-size: 24px;
  letter-spacing: -0.06em;
}

.binding-cassette p {
  margin-top: 14px;
  margin-bottom: 20px;
}

.cassette-slots {
  margin: auto 0 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 6px;
}

.cassette-slots div {
  border: 1px solid var(--soft-rule);
  border-radius: 10px;
  padding: 8px;
  background: #f8fbfb;
}

.cassette-slots dt {
  font-family: var(--mono);
  font-size: 10px;
  text-transform: uppercase;
  color: var(--muted);
}

.cassette-slots dd {
  margin: 2px 0 0;
  font-size: 12px;
  color: var(--teal);
  font-weight: 700;
}

.article-namespace {
  padding: 30px 0 24px;
}

.article-back {
  margin-bottom: 20px;
  font-family: var(--mono);
  font-size: 13px;
}

.article-back a {
  color: var(--teal);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.article-namespace h1 {
  max-width: 980px;
  margin-top: 12px;
  font-family: var(--mono);
  font-size: clamp(38px, 7vw, 76px);
  letter-spacing: -0.08em;
}

.article-meta {
  margin-top: 18px;
  color: var(--muted);
  font-family: var(--mono);
  font-size: 13px;
}

.schema-backplane {
  display: grid;
  grid-template-columns: 190px minmax(0, 1fr) 240px;
  gap: 18px;
  align-items: start;
  padding-bottom: 64px;
}

.vocabulary-sockets,
.answer-contract,
.article-prose {
  border: 1px solid var(--rule);
  background: var(--panel);
}

.vocabulary-sockets,
.answer-contract {
  position: sticky;
  top: 18px;
  border-radius: 22px;
  padding: 16px;
}

.rail-label {
  margin: 0 0 14px;
  color: var(--teal);
}

.vocabulary-sockets ol,
.answer-contract ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.vocabulary-sockets li {
  margin: 10px 0;
  padding-left: 26px;
  position: relative;
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
}

.vocabulary-sockets li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 3px;
  width: 12px;
  height: 12px;
  border: 2px solid var(--copper);
  border-radius: 50%;
}

.answer-contract li {
  border-top: 1px solid var(--soft-rule);
  padding: 11px 0 11px 24px;
  position: relative;
  color: var(--muted);
  font-size: 14px;
}

.answer-contract li::before {
  content: '';
  position: absolute;
  left: 2px;
  top: 15px;
  width: 10px;
  height: 10px;
  border: 2px solid var(--teal);
  border-radius: 3px;
}

.article-prose {
  border-radius: 26px;
  padding: clamp(24px, 5vw, 56px);
  box-shadow: 0 20px 58px var(--shadow);
}

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

.article-prose h2,
.article-prose h3 {
  margin-top: 1.6em;
  font-family: var(--mono);
  letter-spacing: -0.06em;
}

.article-prose h2 { font-size: clamp(26px, 3vw, 38px); }
.article-prose h3 { font-size: 24px; }

.article-prose p,
.article-prose li {
  font-size: 18px;
  color: #243648;
}

.article-prose a {
  color: var(--teal);
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.article-prose code {
  font-family: var(--mono);
  font-size: 0.9em;
  background: #edf5f5;
  border: 1px solid var(--soft-rule);
  border-radius: 6px;
  padding: 0.12em 0.34em;
}

.article-prose pre {
  overflow: auto;
  padding: 18px;
  border-radius: 18px;
  border: 1px solid var(--rule);
  background: #102033;
  color: #edf7f5;
}

.article-prose pre code {
  background: transparent;
  border: 0;
  padding: 0;
  color: inherit;
}

.article-prose blockquote {
  margin: 28px 0;
  padding: 18px 20px;
  border-left: 5px solid var(--copper);
  background: #f8fbfb;
  color: #243648;
}

@media (max-width: 980px) {
  .masthead-grid,
  .schema-backplane,
  .binding-cassette-grid,
  .contact-plates {
    grid-template-columns: 1fr;
  }

  .entity-terminal { min-height: 260px; }

  .vocabulary-sockets,
  .answer-contract {
    position: static;
  }

  .featured-binding {
    grid-template-columns: 1fr;
  }

  .feature-socket {
    grid-template-columns: repeat(4, 34px);
    justify-content: start;
  }
}

@media (max-width: 640px) {
  .schema-home,
  .schema-article-shell {
    width: min(100% - 20px, 1180px);
  }

  .masthead-copy,
  .binding-sequence,
  .featured-binding,
  .article-prose {
    border-radius: 20px;
  }

  .protocol-masthead h1,
  .article-namespace h1 {
    letter-spacing: -0.07em;
  }

  .archive-heading-row {
    display: block;
  }

  .cassette-slots {
    grid-template-columns: 1fr;
  }
}