/* Midnight mode for standalone pages (links, setup, quizzes, book, printables, library). */
html.dark {
  --paper: #141613;
  --ink: #ece7d8;
  --ink-soft: #a9a294;
  --sage: #7d8b74;
  --moss: #a7b59a;
  --clay: #c08a63;
  --line: rgba(236, 231, 216, .28);
}
html.dark body { background: #0b0d0b; }
html.dark .printable,
html.dark .book { background: #141613; }
html.dark .link-btn { color: #ece7d8; }
html.dark .sheet-head p { color: #a9a294; }
html.dark table.log th { background: #1e211b; }
.light-toggle {
  position: fixed; left: 18px; bottom: 18px; z-index: 60;
  width: 46px; height: 46px; border-radius: 50%;
  border: 1.5px solid var(--line); background: var(--paper); color: var(--ink);
  font-size: 20px; cursor: pointer; display: grid; place-items: center;
  box-shadow: 0 6px 18px rgba(0, 0, 0, .35);
  transition: transform .2s ease;
  font-family: Georgia, serif;
}
.light-toggle:hover { transform: translateY(-2px); }
.light-toggle.is-dark { background: #1c1f1a; color: #e8c46a; border-color: rgba(232, 196, 106, .5); }
/* logo badges: invert in dark mode so the mark stays readable */
html.dark img.emblem,
html.dark img.tw-emblem { filter: invert(1); }