.theme-fab {
  position: fixed; left: 16px; bottom: 16px; z-index: 10000;
  width: 40px; height: 40px; border-radius: 50%; cursor: pointer; padding: 0;
  display: inline-flex; align-items: center; justify-content: center;
  color: #0f172a; background: rgba(255,255,255,.88);
  border: 1px solid rgba(15,23,42,.14); box-shadow: 0 4px 14px rgba(0,0,0,.18);
  -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px);
  transition: transform .2s ease, background .2s ease;
}
.theme-fab:hover { transform: scale(1.07); }
.theme-fab:focus-visible { outline: 2px solid #047D78; outline-offset: 2px; }
.theme-fab .ic-sun { display: none; }
html[data-theme="dark"] .theme-fab { color: #e5e7eb; background: rgba(17,24,39,.88); border-color: rgba(148,163,184,.3); }
html[data-theme="dark"] .theme-fab .ic-moon { display: none; }
html[data-theme="dark"] .theme-fab .ic-sun { display: inline; }
html.theme-switching, html.theme-switching * { transition: background-color .25s ease, color .25s ease, border-color .25s ease !important; }
@media (prefers-reduced-motion: reduce) { html.theme-switching, html.theme-switching * { transition: none !important; } }
::view-transition-old(root), ::view-transition-new(root) { animation-duration: .2s; animation-timing-function: ease-out; }
@media print { .theme-fab { display: none !important; } }

.fab-tip {
  position: fixed; z-index: 100000; max-width: 230px;
  padding: 3px 8px; border-radius: 8px; text-align: center;
  font: 600 .6rem/1.35 'Plus Jakarta Sans', sans-serif; white-space: pre-line;
  color: #047D78; background: #ccfbf1; box-shadow: 0 2px 8px rgba(4,125,120,.15);
  opacity: 0; pointer-events: none; transition: opacity .15s ease;
}
.fab-tip.show { opacity: 1; }
.fab-tip::after { content: ''; position: absolute; left: var(--fab-arrow-left, 50%); transform: translateX(-50%); border: 5px solid transparent; }
.fab-tip.fab-tip-top::after { top: 100%; border-top-color: #ccfbf1; }
.fab-tip.fab-tip-bottom::after { bottom: 100%; border-bottom-color: #ccfbf1; }
html[data-theme="dark"] .fab-tip { color: #2dd4bf; background: #15363f; box-shadow: 0 2px 8px rgba(0,0,0,.4); }
html[data-theme="dark"] .fab-tip.fab-tip-top::after { border-top-color: #15363f; }
html[data-theme="dark"] .fab-tip.fab-tip-bottom::after { border-bottom-color: #15363f; }
@media print { .fab-tip { display: none !important; } }