/* Shared appearance control; page content and the original light palette stay intact. */
@media screen {
  html[data-theme="light"] { color-scheme: light; }
  html[data-theme="dark"] { color-scheme: dark; background: #0a1727; }

  button.site-theme-toggle {
    box-sizing: border-box;
    flex: 0 0 auto;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    min-width: 72px;
    min-height: 44px;
    margin: 0;
    padding: 8px 10px;
    border: 1px solid #a6c0d6;
    border-radius: 10px;
    background: #fff;
    color: #184b76;
    font: 700 12px / 1.25 system-ui, sans-serif;
    white-space: nowrap;
    cursor: pointer;
    touch-action: manipulation;
  }
  button.site-theme-toggle::before { content: "☀"; font-size: 15px; }
  html[data-theme="dark"] button.site-theme-toggle {
    border-color: #5b80a4;
    background: #1b334c;
    color: #d4eaff;
  }
  html[data-theme="dark"] button.site-theme-toggle::before { content: "☾"; }
  button.site-theme-toggle:hover { border-color: #247cb7; }
  button.site-theme-toggle:focus-visible { outline: 3px solid #c78922; outline-offset: 3px; }
  html[data-theme="dark"] button.site-theme-toggle:focus-visible { outline-color: #f6cf86; }
  .site-global-header .site-language-controls {
    display: flex;
    align-items: center;
    gap: 6px;
  }
  :is(.site-header, .system-header, .guide-header, .policy-header) > .site-theme-toggle {
    margin-left: 8px;
  }
  .site-theme-toggle-fallback { position: fixed; top: 12px; right: 12px; z-index: 100; }
  [data-site-tool="search"] #app header:not(.site-global-header) > div {
    grid-template-columns: minmax(0, 1fr) auto auto;
  }
  [data-site-tool="search"] #app header:not(.site-global-header) > div > nav {
    grid-column: 1 / -1;
    grid-row: 2;
  }
  [data-site-tool="search"] #app header:not(.site-global-header) > div > select {
    grid-column: 2;
    grid-row: 1;
    width: 86px;
  }
  [data-site-tool="search"] #app header:not(.site-global-header) .site-theme-toggle {
    grid-column: 3;
    grid-row: 1;
  }

  @media (max-width: 540px) {
    button.site-theme-toggle { min-width: 66px; padding-inline: 8px; }
    .site-global-header .site-brand-full { display: none; }
    .site-global-header .site-brand-short { display: inline; }
    .home-tools-first .header-nav { margin-right: 8px; }
    .home-tools-first .site-header { width: calc(100% - 24px); }
    :is(.site-header, .system-header, .guide-header, .policy-header) > .site-theme-toggle { margin-left: 6px; }
    .home-tools-first .header-nav a[href="#news"] { display: none; }
    .system-header { flex-wrap: wrap; }
    .guide-header { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 8px; }
    .guide-header > .guide-brand { grid-column: 1; grid-row: 1; }
    .guide-header > .site-theme-toggle { grid-column: 2; grid-row: 1; margin: 0; }
    .guide-header > .guide-launch { grid-column: 1 / -1; grid-row: 2; justify-self: end; }
    .policy-brand b { display: none; }
    [data-site-tool="search"] #app header:not(.site-global-header) > div > a > span { font-size: 0; }
    [data-site-tool="search"] #app header:not(.site-global-header) > div > a > span > span { display: none; }
    [data-site-tool="search"] #app header:not(.site-global-header) > div > a > span::before { content: "202ch"; font-size: 14px; }
  }
}
@media print { .site-theme-toggle { display: none !important; } }