/* Frequency-Trajectory Control site theme
   Extends the canonical T(h)reehouse +EC tokens without redefining them.
   CD 1.4.0 — WCAG 2.2 AA baseline. */

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

html {
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 400;
  line-height: 1.68;
  color: var(--ink);
  background: var(--parchment);
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--sea);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.site-wrapper {
  display: grid;
  grid-template-columns: 17.5rem minmax(0, 1fr);
  min-height: 100vh;
}

.site-nav {
  position: sticky;
  top: 0;
  align-self: start;
  min-height: 100vh;
  padding: 1.5rem;
  border-right: 1px solid var(--grid);
  background: var(--warm-white);
}

.nav-inner {
  display: flex;
  min-height: calc(100vh - 3rem);
  flex-direction: column;
}

.site-title {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.6rem;
  padding-bottom: 1.35rem;
  border-bottom: 1px solid var(--grid);
}

.site-title:hover {
  text-decoration: none;
}

.site-emblem {
  width: 32px;
  height: 32px;
  flex: 0 0 32px;
}

.site-lockup {
  display: flex;
  min-width: 0;
  flex-direction: column;
  gap: 0.4rem;
}

.site-wordmark {
  width: 7rem;
}

.site-project,
.nav-links a,
.nav-group-label,
.nav-ext,
.nav-badge,
.document-meta,
.doc-type,
.doc-status,
.doc-version,
.endorsement-body,
.finding-label,
.node-number,
.roadmap-label,
.figure-caption,
th {
  font-family: var(--font-mono);
}

.site-project {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--stone);
}

.nav-links,
.nav-group ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.nav-links {
  flex: 1;
}

.nav-links > li {
  margin-bottom: 0.35rem;
}

.nav-group {
  margin-top: 0.95rem;
}

.nav-group-label {
  display: block;
  margin-bottom: 0.45rem;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--stone);
}

.nav-group ul {
  padding-left: 0.9rem;
}

.nav-links a {
  display: block;
  padding: 0.18rem 0.4rem;
  min-height: var(--min-target-aa);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--stone);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--sea);
  background: var(--warm-white);
}

.nav-footer {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 0.8rem;
  padding-top: 1rem;
  border-top: 1px solid var(--grid);
}

.nav-ext,
.nav-badge {
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--stone);
}

.site-content {
  width: min(calc(100% - 3rem), calc(var(--measure) + 10rem));
  margin: 0 auto;
  padding: 6rem 1.5rem 4rem;
}

.site-content > * {
  max-width: var(--measure);
}

h1,
h2,
h3,
h4,
h5,
h6 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  color: var(--ink);
}

h1 {
  font-size: 2.1rem;
  line-height: 1.2;
}

h2 {
  margin-top: 3.5rem;
  padding-top: 1.2rem;
  font-size: 1.15rem;
  line-height: 1.25;
}

h2::before {
  content: "";
  display: block;
  width: 1.5rem;
  height: 1px;
  margin-bottom: 1.2rem;
  background: var(--grid);
}

h3 {
  margin-top: 1.8rem;
  margin-bottom: 0.35rem;
  font-size: 1rem;
}

h4,
h5,
h6 {
  margin-top: 1.3rem;
  margin-bottom: 0.25rem;
  font-size: 0.92rem;
}

p,
ul,
ol,
table,
blockquote,
pre,
.doc-suite,
.finding,
.node-grid,
.roadmap,
.figure-block,
.endorsement-marker {
  margin-top: 0;
  margin-bottom: 0.85rem;
}

ul,
ol {
  padding-left: 1.4rem;
}

li {
  margin-bottom: 0.25rem;
}

blockquote {
  margin-left: 0;
  padding: 0.9rem 1rem;
  border-left: 3px solid var(--sea);
  background: var(--warm-white);
  font-style: italic;
}

code,
pre,
.doc-version {
  font-family: var(--font-mono);
}

code {
  padding: 0.08rem 0.3rem;
  background: var(--warm-white);
  border: 1px solid var(--grid);
  font-size: 0.82em;
}

pre {
  overflow-x: auto;
  padding: 0.9rem 1rem;
  background: var(--ink);
  color: var(--warm-white);
}

pre code {
  padding: 0;
  border: 0;
  background: transparent;
  color: inherit;
}

hr {
  width: 1.5rem;
  height: 1px;
  margin: 3.5rem 0 1.2rem;
  border: 0;
  background: var(--grid);
}

table {
  width: 100%;
  border-collapse: collapse;
  background: var(--warm-white);
}

th,
td {
  padding: 0.55rem 0.7rem;
  border: 1px solid var(--grid);
  text-align: left;
  vertical-align: top;
}

th {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--sea);
}

td {
  color: var(--ink);
}

.document-header {
  margin-bottom: 1.6rem;
}

.document-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.8rem;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.document-subtitle {
  margin-top: 0.45rem;
  color: var(--stone);
  font-style: italic;
}

.doc-type,
.doc-status {
  display: inline-flex;
  align-items: center;
  padding: 0.12rem 0.4rem;
  border: 1px solid var(--grid);
  background: var(--warm-white);
}

.doc-type {
  color: var(--sea);
}

.doc-status,
.doc-version {
  color: var(--stone);
}

.endorsement-marker {
  padding: 0.9rem 1rem;
  border: 1px solid var(--grid);
  background: var(--warm-white);
}

.endorsement-body {
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--stone);
}

.endorsement-body p {
  margin-bottom: 0.3rem;
}

.endorsement-body p:last-child {
  margin-bottom: 0;
}

.endorsement-framework {
  color: var(--sea);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.endorsement-lock strong,
.endorsement-key strong {
  color: var(--ink);
}

.endorsement-epistemology {
  font-style: italic;
}

.document-footer {
  padding-top: 0.9rem;
  border-top: 1px solid var(--grid);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--stone);
}

.landing-hero {
  margin-bottom: 2.5rem;
}

.landing-status {
  margin-top: 0.65rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--stone);
}

.load-bearing,
.finding {
  padding: 1rem 1.1rem;
  border-left: 3px solid var(--sea);
  background: var(--warm-white);
}

.load-bearing p:last-child,
.finding p:last-child {
  margin-bottom: 0;
}

.doc-suite,
.node-grid {
  display: grid;
  gap: 0.85rem;
}

.doc-card,
.node-card,
.figure-block {
  display: block;
  padding: 0.95rem 1rem;
  border: 1px solid var(--grid);
  background: var(--warm-white);
  color: inherit;
}

.doc-card:hover {
  border-color: var(--sea);
  text-decoration: none;
}

.doc-card-header {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.55rem;
}

.doc-card-title,
.node-function {
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 600;
}

.doc-card-desc,
.node-expertise,
.roadmap-label span,
.figure-caption {
  color: var(--stone);
}

.finding-label,
.node-number,
.roadmap-label,
.figure-caption {
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.finding-label {
  margin-bottom: 0.55rem;
  color: var(--sea);
}

.roadmap-item {
  display: grid;
  grid-template-columns: 1rem 1fr;
  gap: 0.8rem;
  align-items: start;
  padding: 0.35rem 0;
}

.roadmap-marker {
  width: 1rem;
  height: 1rem;
  margin-top: 0.3rem;
  border: 1px solid var(--grid);
  border-radius: 50%;
  background: transparent;
}

.roadmap-marker--done,
.roadmap-marker--active {
  background: var(--sea);
  border-color: var(--sea);
}

.roadmap-label strong {
  display: block;
  font-family: var(--font-serif);
  font-size: 0.96rem;
  font-weight: 600;
  letter-spacing: 0;
  text-transform: none;
  color: var(--ink);
}

.lock-block,
.key-block {
  padding: 0.85rem 1rem;
  background: var(--warm-white);
  border-left: 3px solid var(--sea);
}

.figure-block img {
  display: block;
  margin: 0 auto;
}

/* --- Accessibility (CD 1.4.0 / WCAG 2.2 AA) --- */

:focus-visible {
  outline: var(--focus-ring);
  outline-offset: var(--focus-offset);
}

a, button, [role="button"], input, select, textarea {
  min-height: var(--min-target-aa);
}

.site-nav a {
  min-height: var(--min-target);
  padding-block: 0.5rem;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 0;
  padding: 0.75rem 1.5rem;
  background: var(--ink);
  color: var(--parchment);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  z-index: 1000;
}

.skip-link:focus {
  top: 0;
  color: var(--parchment);
}

@media (max-width: 900px) {
  .site-wrapper {
    grid-template-columns: 1fr;
  }

  .site-nav {
    position: static;
    min-height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--grid);
  }

  .nav-inner {
    min-height: auto;
  }

  .nav-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.15rem 0.4rem;
    margin-bottom: 1rem;
  }

  .nav-group {
    margin-top: 0;
  }

  .nav-group-label {
    width: 100%;
  }

  .nav-group ul {
    display: flex;
    flex-wrap: wrap;
    gap: 0.15rem 0.4rem;
    padding-left: 0;
  }

  .site-content {
    width: min(100%, calc(var(--measure) + 3rem));
    padding-top: 4rem;
  }

  .node-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  html {
    font-size: 16px;
  }

  .site-nav,
  .site-content {
    padding-left: 1.25rem;
    padding-right: 1.25rem;
  }

  .site-content {
    padding-top: 2.5rem;
  }

  .site-title {
    align-items: flex-start;
  }

  .site-wordmark {
    width: 6rem;
  }
}