/*
Copyright 2026 Karl J. Obermeyer

Common dark mode style for desktop, mobile, menued pages, and unmenued pages.
*/

/* Global dark-mode toggling via adding class to outer html tag */
html.dark-mode {
  -webkit-filter: invert(1);
          filter: invert(1);
}
.dark-mode img.dark-mode-immune,
.dark-mode video.dark-mode-immune {
  /* Counter-inversion for tagged images/videos */
  -webkit-filter: invert(1);
          filter: invert(1);
}

header {
  position: relative;
  padding-top: 15px;  /* Space for dark mode toggle */
}

.dark-mode-toggle {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: -webkit-gradient(linear, left top, right top, color-stop(50%, #000), color-stop(50%, #fff));
  background: linear-gradient(to right, #000 50%, #fff 50%);
  cursor: pointer;
  padding: 0;
  -webkit-box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
          box-shadow: 0 2px 4px rgba(0, 0, 0, 0.15);
  -webkit-transition: -webkit-transform 0.2s ease, -webkit-box-shadow 0.2s ease;
  transition: -webkit-transform 0.2s ease, -webkit-box-shadow 0.2s ease;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  transition: transform 0.2s ease, box-shadow 0.2s ease, -webkit-transform 0.2s ease, -webkit-box-shadow 0.2s ease;
  z-index: 100;
}

.dark-mode-toggle:hover {
  -webkit-transform: scale(1.08);
      -ms-transform: scale(1.08);
          transform: scale(1.08);
  -webkit-box-shadow: 0 3px 6px rgba(0, 0, 0, 0.2);
          box-shadow: 0 3px 6px rgba(0, 0, 0, 0.2);
}

.dark-mode-toggle:active {
  -webkit-transform: scale(0.92);
      -ms-transform: scale(0.92);
          transform: scale(0.92);
}

.dark-mode-toggle:focus-visible {
  outline: 2px solid #4a90e2;
  outline-offset: 2px;
}