/* Interface surfaces are separate from the original v4 brand tokens. */
:root {
  color-scheme: light;
  --page-bg: #f2f0ec;
  --text: #111114;
  --muted: #565963;
  --accent-text: #b63216;
  --line: #d3d1cd;
  --control-border: #777a80;
  --panel: #e7e5df;
  --card-bg: #faf9f6;
  --contact-bg: #ebe9e3;
  --thumb-bg: #ddd9d0;
  --thumb-selected: #ffe3d9;
  --card-shadow: #1111140b;
  --light-logo: block;
  --dark-logo: none;
  --collab-watermark: url('/assets/brand/plg-principal-ink.svg');
  --collab-watermark-opacity: .045;
}
:root[data-theme='dark'] {
  color-scheme: dark;
  --page-bg: #111114;
  --text: #f2f0ec;
  --muted: #b8bbc4;
  --accent-text: #ff8466;
  --line: #3b3b43;
  --control-border: #73737e;
  --panel: #24242c;
  --card-bg: #1c1c22;
  --contact-bg: #1c1c22;
  --thumb-bg: #303039;
  --thumb-selected: #44271f;
  --card-shadow: #00000040;
  --light-logo: none;
  --dark-logo: block;
  --collab-watermark: url('/assets/brand/plg-principal-ascua.svg');
  --collab-watermark-opacity: .07;
}
/* Device preference also works without JavaScript. A manual choice wins. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    color-scheme: dark;
    --page-bg: #111114;
    --text: #f2f0ec;
    --muted: #b8bbc4;
    --accent-text: #ff8466;
    --line: #3b3b43;
    --control-border: #73737e;
    --panel: #24242c;
    --card-bg: #1c1c22;
    --contact-bg: #1c1c22;
    --thumb-bg: #303039;
    --thumb-selected: #44271f;
    --card-shadow: #00000040;
    --light-logo: none;
    --dark-logo: block;
    --collab-watermark: url('/assets/brand/plg-principal-ascua.svg');
    --collab-watermark-opacity: .07;
  }
}
.theme-light-logo { display: var(--light-logo); }
.theme-dark-logo { display: var(--dark-logo); }
.collaboration-section::before { background-image: var(--collab-watermark); opacity: var(--collab-watermark-opacity); }
.language-toggle, .menu-toggle, .carousel-toolbar button { border-color: var(--control-border); }
.header-actions { display: flex; align-items: center; gap: 8px; order: 2; }
.site-nav { order: 1; margin-left: auto; }
.theme-picker { position: relative; flex: 0 0 auto; }
.theme-toggle { width: 44px; height: 44px; display: grid; place-items: center; padding: 9px; border: 1px solid var(--control-border); border-radius: 4px; background: transparent; }
.theme-toggle:hover, .theme-toggle[aria-expanded='true'] { background: var(--panel); }
.theme-toggle svg { width: 22px; height: 22px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.theme-menu { position: absolute; top: calc(100% + 10px); right: 0; width: 210px; max-width: calc(100vw - 32px); padding: 6px; border: 1px solid var(--control-border); border-radius: 9px; background: var(--card-bg); box-shadow: 0 10px 28px #0003; z-index: 15; }
.theme-menu button { display: flex; align-items: center; gap: 12px; width: 100%; min-height: 48px; padding: 10px 12px; background: transparent; border: 0; border-radius: 4px; font-size: .875rem; text-align: left; }
.theme-menu button::before { content: ''; width: 8px; height: 8px; flex: 0 0 8px; border: 1px solid var(--muted); border-radius: 50%; }
.theme-menu button[aria-checked='true']::before { background: var(--accent-text); border-color: var(--accent-text); }
.theme-menu button:hover, .theme-menu button:focus-visible { background: var(--panel); }
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
@media (max-width: 1100px) and (min-width: 761px) {
  .header-inner { gap: 18px; }
  .site-nav { gap: 18px; }
}
@media (max-width: 760px) {
  .header-actions { order: 1; margin-left: auto; }
  .site-nav { order: 2; margin-left: 0; }
  .menu-toggle { width: 44px; height: 44px; justify-content: center; padding: 8px; }
  .menu-toggle [data-i18n='menu'] { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
}