/* Theme toggle — geometric bg layer, top-right gutter */

.theme-toggle {
  --toggle-btn: 34px;
  --toggle-pad: 4px;

  position: relative;
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
  width: max-content;
  padding: var(--toggle-pad);
  border-radius: 12px;
  pointer-events: auto;
}

.theme-toggle--bg {
  position: fixed;
  top: max(20px, env(safe-area-inset-top, 0px));
  right: max(20px, env(safe-area-inset-right, 0px));
  left: auto;
  z-index: 0;
  border: 1px solid var(--toggle-bg-border);
  background: var(--toggle-bg-surface);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  box-shadow: none;
}

.theme-toggle__indicator {
  position: absolute;
  top: var(--toggle-pad);
  left: var(--toggle-pad);
  width: var(--toggle-btn);
  height: var(--toggle-btn);
  border-radius: 8px;
  border: 1px solid var(--toggle-active-border);
  background: var(--toggle-active-fill);
  pointer-events: none;
  transition: transform 0.45s cubic-bezier(0.34, 1.2, 0.64, 1);
  z-index: 0;
}

.theme-toggle__btn {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: var(--toggle-btn);
  height: var(--toggle-btn);
  padding: 0;
  border: none;
  border-radius: 8px;
  background: transparent;
  color: var(--toggle-muted);
  cursor: pointer;
  transition: color 0.2s ease, opacity 0.2s ease;
  opacity: 0.72;
}

.theme-toggle__btn:hover {
  color: var(--toggle-fg);
  opacity: 1;
}

.theme-toggle__btn[aria-checked="true"] {
  color: var(--toggle-fg);
  opacity: 1;
}

.theme-toggle__btn svg {
  width: 17px;
  height: 17px;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* Wide layout: right gutter outside centered content (~1200px) */
@media (min-width: 1250px) {
  .theme-toggle--bg {
    right: max(28px, calc((100vw - 1200px) / 2 - 116px));
  }
}

@media (max-width: 579px) {
  .theme-toggle--bg {
    top: max(14px, env(safe-area-inset-top, 0px));
    right: max(14px, env(safe-area-inset-right, 0px));
  }
}

@media (prefers-reduced-motion: reduce) {
  .theme-toggle__indicator {
    transition-duration: 0.01ms;
  }
}