/* Shared site navigation. Colour tokens (--surface, --ink, ...) come from each page's style.css. */
.sitenav {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.sitenav-inner {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 16px;
  min-height: 56px;
  display: flex;
  align-items: center;
  gap: 20px;
}
/* Logo: the mark keeps its blues; the wordmark uses currentColor = the logo navy, or white in dark mode */
:root { --brand-ink: #09152f; }
@media (prefers-color-scheme: dark) { :root:where(:not([data-theme="light"])) { --brand-ink: #ffffff; } }
:root[data-theme="dark"] { --brand-ink: #ffffff; }
.sitenav-brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--brand-ink);
  text-decoration: none;
  flex-shrink: 0;
}
.sitenav-brand svg { display: block; }
.logo-mark { width: 30px; height: 30px; }
.logo-word { width: 92px; height: 20px; }
.sitenav-links { display: flex; align-items: stretch; gap: 4px; flex: 1; min-width: 0; align-self: stretch; }
.sitenav-links a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0 12px;
  font-size: 15px;
  color: var(--ink-2);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  white-space: nowrap;
}
.sitenav-links a span { color: var(--muted); font-size: 13px; }
.sitenav-links a:hover { color: var(--ink); background: var(--hover); }
.sitenav-links a[aria-current="page"] { color: var(--ink); font-weight: 600; border-bottom-color: var(--ink); }
.sitenav-links a[aria-current="page"] span { color: var(--ink-2); font-weight: 450; }

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 13px;
  cursor: pointer;
  color: var(--ink-2);
  font: inherit;
  font-size: 14px;
}
.theme-toggle:hover { background: var(--hover); }
.theme-toggle svg { width: 16px; height: 16px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; }
.theme-toggle .icon-moon { display: none; }
:root[data-theme-active="dark"] .theme-toggle .icon-sun { display: none; }
:root[data-theme-active="dark"] .theme-toggle .icon-moon { display: inline; }

@media (max-width: 640px) {
  .sitenav-inner { gap: 10px; }
  .logo-mark { width: 26px; height: 26px; }
  .logo-word { width: 74px; height: 16px; }
  .sitenav-links a { padding: 0 8px; font-size: 14px; }
  .sitenav-links a span { display: none; }
  .theme-label { display: none; }
  .theme-toggle { padding: 6px 9px; }
}