.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  backdrop-filter: blur(12px);
  background: rgba(244, 241, 236, 0.88);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), background var(--transition);
}

.site-header.is-scrolled {
  border-bottom-color: var(--color-line);
  background: rgba(244, 241, 236, 0.96);
}

.nav-shell {
  width: min(calc(100% - (var(--page-gutter) * 2)), var(--page-max));
  max-width: none;
  margin: 0 auto;
  padding: 0;
  min-height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
}

.brand {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  text-decoration: none;
  letter-spacing: -0.02em;
}

.brand span {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-top: 0.15rem;
}

.nav-links {
  display: none;
  align-items: center;
  gap: var(--space-5);
}

.nav-links a {
  text-decoration: none;
  color: var(--color-ink-soft);
  font-size: 0.95rem;
  position: relative;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.3rem;
  width: 100%;
  height: 1px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition);
}

.nav-links a:hover::after,
.nav-links a[aria-current="page"]::after {
  transform: scaleX(1);
}

.nav-cta { display: none; }

.nav-toggle {
  width: 2.75rem;
  height: 2.75rem;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-md);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.nav-toggle-bars,
.nav-toggle-bars::before,
.nav-toggle-bars::after {
  display: block;
  width: 1.1rem;
  height: 2px;
  background: var(--color-ink);
  position: relative;
}

.nav-toggle-bars::before,
.nav-toggle-bars::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav-toggle-bars::before { top: -6px; }
.nav-toggle-bars::after { top: 6px; }

.mobile-nav {
  display: none;
  border-top: 1px solid var(--color-line);
  padding: var(--space-4) var(--page-gutter) var(--space-5);
  background: var(--color-surface-elevated);
}

.mobile-nav.is-open { display: block; }

.mobile-nav a {
  display: block;
  padding: var(--space-3) 0;
  text-decoration: none;
  border-bottom: 1px solid var(--color-line);
}

.container {
  width: min(calc(100% - (var(--page-gutter) * 2)), var(--page-max));
  margin-inline: auto;
}

/* Prefer .container + .content-* child. Kept for contact form legacy. */
.container-narrow {
  width: min(calc(100% - (var(--page-gutter) * 2)), var(--page-max));
  margin-inline: auto;
}

.container-narrow > * {
  max-width: var(--content-max);
  margin-left: 0;
  margin-right: auto;
}

.content-standard {
  max-width: var(--content-max);
  width: 100%;
  margin-left: 0;
  margin-right: auto;
}

.content-reading {
  max-width: var(--reading-max);
  width: 100%;
  margin-left: 0;
  margin-right: auto;
}

/* When reading/standard is applied ON the container, keep page left edge */
.container.content-standard,
.container.content-reading,
.container.narrow-copy,
.container.prose,
.container.thesis-hero-inner {
  width: min(calc(100% - (var(--page-gutter) * 2)), var(--page-max));
  max-width: none;
  margin-inline: auto;
}

.container.content-standard > *:not(.section-content):not(.mw-grid):not(.tech-landscape):not(.measure-grid):not(.split-blocks):not(.field-stories):not(.os-vertical):not(.cluster):not(.arch-ascii):not(.arch-decision-grid):not(.about-hero-grid):not(.case-editorial),
.container.narrow-copy > *:not(.cluster):not(.mw-card-metric),
.container.thesis-hero-inner > * {
  max-width: var(--content-max);
}

.container.content-reading > *:not(.cluster):not(.arch-ascii):not(.arch-decision-grid),
.container.prose > *:not(.cluster):not(.arch-ascii):not(.arch-decision-grid):not(.tag) {
  max-width: var(--reading-max);
}

.container.prose > .arch-ascii,
.container.prose > .arch-decision-grid,
.container.prose > .cluster {
  max-width: none;
}

.section {
  padding: var(--space-section) 0;
}

.section-header {
  display: grid;
  gap: var(--space-3);
  margin-bottom: var(--space-7);
  max-width: var(--content-max);
  width: 100%;
  margin-left: 0;
  margin-right: auto;
}

.section-eyebrow {
  /* semantic alias; visual from .eyebrow */
}

.section-title {
  margin: 0;
}

.section-intro {
  margin: 0;
  max-width: none;
}

.section-content {
  width: 100%;
  max-width: none;
}

.numbered-item {
  display: grid;
  grid-template-columns: var(--numbered-col) minmax(0, 1fr);
  column-gap: var(--space-5);
  align-items: start;
}

@media (max-width: 599px) {
  .numbered-item {
    grid-template-columns: 2.5rem minmax(0, 1fr);
    column-gap: var(--space-4);
  }
}



.page-hero + .section,
.page-hero + .editorial-section,
.thesis-hero + .section,
.thesis-hero + .editorial-section {
  padding-top: var(--space-6);
}

.page-hero .editorial-header {
  margin-bottom: 0;
}

.site-footer {
  margin-top: var(--space-8);
  background: var(--color-ink);
  color: #e8e4dc;
  padding: var(--space-8) 0 var(--space-6);
}

.site-footer a {
  color: #e8e4dc;
  text-decoration: none;
}

.site-footer a:hover { color: #fff; }

.footer-grid {
  display: grid;
  gap: var(--space-6);
}

.footer-brand {
  font-family: var(--font-display);
  font-size: 1.8rem;
}

.footer-roles {
  display: grid;
  gap: var(--space-1);
  margin-top: var(--space-3);
  color: #b8b2a6;
  font-size: 0.95rem;
}

.footer-columns {
  display: grid;
  gap: var(--space-5);
}

.footer-columns h2,
.footer-columns h3 {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #9aa3ad;
  margin-bottom: var(--space-3);
}

.footer-columns ul {
  display: grid;
  gap: var(--space-2);
}

.footer-meta {
  margin-top: var(--space-7);
  padding-top: var(--space-5);
  border-top: 1px solid rgba(255,255,255,0.12);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  justify-content: space-between;
  color: #9aa3ad;
  font-size: 0.9rem;
}

@media (min-width: 900px) {
  .nav-links,
  .nav-cta { display: flex; }
  .nav-toggle { display: none; }
  .footer-grid {
    grid-template-columns: 1.2fr 1fr;
    align-items: start;
  }
  .footer-columns {
    grid-template-columns: 1fr 1fr;
  }
}