/* ═══════════════════════════════════════════════════════════════════════════════
   SITE LAYOUT
   Shared chrome: nav, footer, section wrapper, page header.
   ═══════════════════════════════════════════════════════════════════════════════ */

/* ── Section wrapper ────────────────────────────────────────────────────────── */
.section-inner {
  max-width:    1100px;
  margin-inline: auto;
  padding-inline: var(--page-gutter);
}

/* ── Navigation ─────────────────────────────────────────────────────────────── */
.site-nav {
  position:   sticky;
  top:        0;
  z-index:    100;
  background: color-mix(in srgb, var(--color-background) 85%, transparent);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.site-nav__inner {
  max-width:       1100px;
  margin-inline:   auto;
  padding-inline:  var(--page-gutter);
  height:          64px;
  display:         flex;
  align-items:     center;
  gap:             var(--space-8);
}

/* Brand */
.site-nav__brand {
  display:         flex;
  align-items:     center;
  gap:             var(--space-3);
  text-decoration: none;
  flex-shrink:     0;
}

.site-nav__brand-glyph {
  font-size:   1.5rem;
  color:       var(--color-accent);
  line-height: 1;
  /* Slow pulse on the glyph */
  animation:   nav-glyph-pulse 4s ease-in-out infinite;
}

@keyframes nav-glyph-pulse {
  0%, 100% { opacity: 1;    text-shadow: 0 0 8px var(--color-accent); }
  50%       { opacity: 0.6; text-shadow: none; }
}

.site-nav__brand-name {
  font-size:      var(--font-base);
  color:          var(--color-text-primary);
  letter-spacing: 0.08em;
  transition:     color var(--transition-fast);
}

.site-nav__brand:hover .site-nav__brand-name { color: var(--color-accent); }

/* Links */
.site-nav__links {
  display:     flex;
  align-items: center;
  gap:         var(--space-6);
  list-style:  none;
  margin-left: auto;
}

.site-nav__link {
  font-family:    var(--font-family-mono);
  font-size:      var(--font-tiny);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color:          var(--color-text-secondary);
  text-decoration: none;
  position:       relative;
  padding-bottom: var(--space-1);
  transition:     color var(--transition-fast);
}

.site-nav__link::after {
  content:    '';
  position:   absolute;
  bottom:     0;
  left:       0;
  width:      0;
  height:     1px;
  background: var(--color-accent);
  transition: width var(--transition-normal);
}

.site-nav__link:hover,
.site-nav__link--active {
  color: var(--color-accent);
}

.site-nav__link:hover::after,
.site-nav__link--active::after {
  width: 100%;
}

/* Mobile toggle (hidden until JS activates) */
.site-nav__toggle {
  display:        none;
  flex-direction: column;
  justify-content: center;
  gap:            5px;
  background:     none;
  border:         none;
  cursor:         pointer;
  padding:        var(--space-2);
  margin-left:    auto;
}
.site-nav__toggle span {
  display:    block;
  width:      22px;
  height:     1px;
  background: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

@media (max-width: 640px) {
  .site-nav__toggle { display: flex; }
  .site-nav__links  {
    display:     none;
    position:    absolute;
    top:         64px;
    left:        0;
    right:       0;
    flex-direction: column;
    align-items: flex-start;
    gap:         0;
    background:  var(--color-foreground);
    border-bottom: 1px solid var(--color-border);
    padding:     var(--space-4) var(--page-gutter);
  }
  .site-nav__links.is-open { display: flex; }
  .site-nav__link { padding-block: var(--space-3); }
}

/* ── Footer ─────────────────────────────────────────────────────────────────── */
.site-footer {
  border-top:  1px solid var(--color-border);
  margin-top:  var(--space-16);
  padding-block: var(--space-10);
}

.site-footer__inner {
  max-width:      1100px;
  margin-inline:  auto;
  padding-inline: var(--page-gutter);
  display:        grid;
  grid-template-columns: 1fr auto auto;
  gap:            var(--space-10);
  align-items:    start;
}

@media (max-width: 640px) {
  .site-footer__inner {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
}

.site-footer__brand { display: flex; flex-direction: column; gap: var(--space-2); }
.site-footer__brand .font-display { font-size: var(--font-large); letter-spacing: 0.08em; }

.site-footer__links { display: flex; flex-direction: column; gap: var(--space-3); }
.site-footer__links ul { list-style: none; display: flex; flex-direction: column; gap: var(--space-2); }
.site-footer__link {
  font-family:     var(--font-family-mono);
  font-size:       var(--font-tiny);
  letter-spacing:  0.12em;
  text-transform:  uppercase;
  color:           var(--color-text-disabled);
  text-decoration: none;
  transition:      color var(--transition-fast);
}
.site-footer__link:hover { color: var(--color-text-secondary); }

.site-footer__legal {
  display:        flex;
  flex-direction: column;
  gap:            var(--space-2);
  text-align:     right;
}
@media (max-width: 640px) { .site-footer__legal { text-align: left; } }

/* ── Page header (inner pages) ──────────────────────────────────────────────── */
.page-header {
  padding-block:   var(--space-12) var(--space-8);
  border-bottom:   1px solid var(--color-divider);
  margin-bottom:   var(--space-10);
  position:        relative;
  overflow:        hidden;
}

.page-header::before {
  content:    '';
  position:   absolute;
  inset:      0;
  background: repeating-linear-gradient(
    90deg,
    transparent,
    transparent calc(var(--space-8) - 1px),
    var(--color-grid-line) calc(var(--space-8) - 1px),
    var(--color-grid-line) var(--space-8)
  );
  opacity: 0.3;
  pointer-events: none;
}

.page-header__title {
  font-size:   clamp(2rem, 5vw, 3rem);
  margin-block: var(--space-2) var(--space-4);
}

.page-header__sub {
  max-width: 60ch;
  font-size: var(--font-large);
}