/* Appearance controls within the shared About / Letter modal frame.
   Preserve the desktop's controls and palette. VARIANCE 3 / MOTION 3 / DENSITY 5. */
.tb-window[data-app="glass-settings"] {
  min-width: 0;
  min-height: 0;
  box-sizing: border-box;
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
}
.tb-window[data-app="glass-settings"] .tb-window-titlebar {
  height: 56px;
  min-height: 56px;
  flex: 0 0 56px;
  padding: 0 12px;
  background: transparent;
}
.tb-window[data-app="glass-settings"] .tb-window-title { display: none; }
.tb-window[data-app="glass-settings"] .tb-window-traffic { margin-left: auto; gap: 0; }
.tb-glass-settings {
  width: 100%;
  height: 100%;
  min-width: 0;
  background: #fff;
}

.tb-glass-settings-content {
  background: #fff;
  scrollbar-width: thin;
  scrollbar-color: #b4bbc1 transparent;
  overscroll-behavior: contain;
}
.tb-glass-settings-pane { padding: 4px 24px 24px; }
.tb-glass-settings .tb-set-pane-title { margin: 0 0 7px; font-size: 24px; line-height: 29px; font-weight: 700; letter-spacing: -.025em; }

.tb-glass-settings-intro {
  max-width: 42ch;
  margin: 0 0 22px;
  color: #626267;
  font-size: 13px;
  line-height: 1.45;
}

.tb-glass-settings-heading,
.tb-glass-settings-slider-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.tb-glass-settings-heading { margin: 0 2px 7px; }
.tb-glass-settings-heading .tb-set-group-label { margin: 0; }
.tb-glass-settings-current { color: #6e6e73; font-size: 11px; }

.tb-glass-settings-presets {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  margin-bottom: 16px;
}

.tb-glass-settings-preset {
  min-width: 0;
  min-height: 60px;
  padding: 9px 7px;
  border: 1px solid rgba(0, 0, 0, .12);
  border-radius: 10px;
  background: #fff;
  color: #1d1d1f;
  font: inherit;
  cursor: pointer;
  transition: border-color .15s ease, background-color .15s ease;
}

.tb-glass-settings-preset-name { display: block; font-size: 13px; font-weight: 600; }
.tb-glass-settings-preset-detail { display: block; margin-top: 4px; color: #6e6e73; font-size: 10px; line-height: 1.25; }
.tb-glass-settings-preset:hover { background: #fafafa; border-color: rgba(0, 0, 0, .24); }
.tb-glass-settings-preset[aria-pressed='true'] { border-color: #007aff; background: #edf5ff; box-shadow: inset 0 0 0 1px #007aff; }
.tb-glass-settings-preset[aria-pressed='true'] .tb-glass-settings-preset-name { color: #005ac2; }

.tb-glass-settings-slider-row { padding: 10px 13px 12px; }
.tb-glass-settings-slider-row + .tb-glass-settings-slider-row { border-top: 1px solid rgba(0, 0, 0, .07); }
.tb-glass-settings-slider-heading .tb-set-slider-val { color: #636369; font-size: 12px; font-variant-numeric: tabular-nums; }

.tb-glass-settings .tb-glass-settings-range {
  display: block;
  width: 100%;
  height: 5px;
  margin: 12px 0 2px;
  background: linear-gradient(to right, #007aff 0 var(--tb-glass-slider-progress), #d8d8de var(--tb-glass-slider-progress) 100%);
  border-radius: 4px;
  touch-action: pan-y;
}

.tb-glass-settings-motion-row { min-height: 63px; padding: 11px 13px; }
.tb-glass-settings-motion-copy { display: flex; flex-direction: column; gap: 4px; cursor: pointer; }
.tb-glass-settings-hint { color: #6e6e73; font-size: 11px; line-height: 1.4; }

.tb-glass-settings-switch {
  -webkit-appearance: none;
  appearance: none;
  position: relative;
  flex: 0 0 38px;
  width: 38px;
  height: 23px;
  margin: 0;
  padding: 0;
  border: 0;
  border-radius: 12px;
  background: #d8d8de;
  cursor: pointer;
  transition: background-color .18s ease;
}

.tb-glass-settings-switch::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 19px;
  height: 19px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 1px 3px rgba(0, 0, 0, .23);
  transition: transform .18s ease;
}

.tb-glass-settings-switch:checked { background: #30b952; }
.tb-glass-settings-switch:checked::after { transform: translateX(15px); }
.tb-glass-settings-footer { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px; padding: 1px 2px 0; }
.tb-glass-settings-restore { min-height: 32px; font-size: 12px; border-radius: 8px; }

.tb-glass-settings :is(button, input):focus-visible { outline: 3px solid rgba(0, 122, 255, .65); outline-offset: 3px; }

@media (max-width: 768px), (max-width: 1024px) and (max-height: 500px) {
  #windows-root .tb-window[data-app="glass-settings"] {
    left: max(16px, env(safe-area-inset-left, 0px)) !important;
    right: max(16px, env(safe-area-inset-right, 0px));
    top: 8px !important;
    width: auto !important;
    max-width: 420px;
    margin-inline: auto;
    height: 640px !important;
    max-height: calc(100% - 128px - env(safe-area-inset-bottom, 0px));
  }
  .tb-window[data-app="glass-settings"] .tb-window-titlebar { height: 48px; min-height: 48px; flex-basis: 48px; }
  .tb-glass-settings-pane { padding: 4px 20px 20px; }
  .tb-glass-settings-presets { gap: 6px; }
  .tb-glass-settings-restore { min-height: 44px; }
}

@media (prefers-reduced-motion: reduce) {
  .tb-glass-settings-preset,
  .tb-glass-settings-switch,
  .tb-glass-settings-switch::after { transition: none; }
}

.tb-glass-settings-range:disabled { opacity: .4; cursor: default; }