/*
  Shared header styles for brightflowingspace sub-pages (privacy, support, ...).
  Kept in sync by hand with the nav in brightflowingspace/index.html (main site).
  Requires the host page to define --fg, --muted, --border, --accent as CSS custom
  properties on :root / :root.dark, and to load Noto Sans JP (weights 300/400/500/700)
  from Google Fonts before this stylesheet.
*/
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  width: 100%;
  box-sizing: border-box;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
body { padding-top: 52px; }
.site-header-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--fg);
  font-family: 'Noto Sans JP', sans-serif;
  font-weight: 700;
  font-size: 11px;
  /* Matches Tailwind's inherited 1.5 on the main site; the host page's
     body line-height (1.85) would otherwise push the text down ~3px. */
  line-height: 1.5;
  letter-spacing: 0.05em;
}
.site-header-brand img { width: 19px; height: 19px; border-radius: 6px; display: block; }
.site-header-lang {
  display: flex;
  align-items: center;
  gap: 4px;
  font-family: 'Noto Sans JP', sans-serif;
  font-size: 10px;
  font-weight: 700;
  line-height: 1.5;
  letter-spacing: 0.2em;
}
.site-header-lang a {
  color: var(--muted);
  text-decoration: none;
  transition: color 0.15s ease;
}
.site-header-lang a:hover { color: var(--accent); }
.site-header-lang span { color: var(--border); }
.site-header-right {
  display: flex;
  align-items: center;
  gap: 40px;
}
/*
  Theme toggle: a system / light / dark segmented pill.
  Mirrors the nav on the main site (Tailwind: p-1 gap-0.5 rounded-full bg-slate-100
  dark:bg-white/10, active button bg-white dark:bg-white/15 shadow-sm).
  The group/active backgrounds are hard-coded rather than themed via custom
  properties so host pages only need --muted / --accent, as documented above.
*/
.theme-toggle-group {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 4px;
  border-radius: 999px;
  background: #f1f5f9;
}
:root.dark .theme-toggle-group { background: rgba(255, 255, 255, 0.10); }
.theme-toggle-group button {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background: none;
  border: none;
  border-radius: 999px;
  padding: 0;
  cursor: pointer;
  color: var(--muted);
  line-height: 0;
  transition: background-color 0.15s ease, color 0.15s ease;
}
.theme-toggle-group button svg { display: block; width: 14px; height: 14px; }
.theme-toggle-group button.is-active {
  background: #fff;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
  color: var(--accent);
}
:root.dark .theme-toggle-group button.is-active {
  background: rgba(255, 255, 255, 0.15);
  box-shadow: none;
}
@media (min-width: 768px) {
  .site-header { padding: 20px 48px; }
  /* font-size/line-height mirror Tailwind's text-lg (18px/28px) and text-xs (12px/16px). */
  .site-header-brand { gap: 12px; font-size: 18px; line-height: 28px; }
  .site-header-brand img { width: 24px; height: 24px; }
  .site-header-lang { font-size: 12px; line-height: 16px; }
  .theme-toggle-group button { width: 28px; height: 28px; }
  .theme-toggle-group button svg { width: 16px; height: 16px; }
  body { padding-top: 69px; }
}