/* Keyboard-shortcuts help overlay (opened with "?" on desktop). */

.kb-help-backdrop {
  position: fixed;
  inset: 0;
  z-index: 1300;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  opacity: 0;
  transition: opacity 0.18s ease;
}

/* The `hidden` attribute must win over `display: flex` above, or the
   full-screen backdrop keeps swallowing every click while closed. */
.kb-help-backdrop[hidden] {
  display: none;
}

.kb-help-backdrop.visible {
  opacity: 1;
}

.kb-help-panel {
  position: relative;
  width: min(380px, 100%);
  padding: 24px;
  border-radius: var(--radius-xl);
  color: var(--text-color-primary);

  /* Same glass material as the popovers / header buttons — see the recipe
     note at :root's --glass-tint definition. */
  background: var(--glass-tint);
  backdrop-filter: blur(var(--glass-blur-lg));
  -webkit-backdrop-filter: blur(var(--glass-blur-lg));
  box-shadow:
    0 0 0 0.1px var(--glass-outline),
    var(--glass-highlight),
    0 4px 40px 0 var(--glass-shadow-color);

  transform: translateY(8px) scale(0.98);
  transition: transform 0.18s ease;
}

/* Outside 0.5px gradient stroke — same recipe as .popover::after. */
.kb-help-panel::after {
  content: "";
  position: absolute;
  inset: -0.5px;
  border-radius: inherit;
  padding: 0.5px;
  background: var(--glass-stroke-gradient);
  opacity: var(--glass-stroke-opacity);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

@supports not ((-webkit-backdrop-filter: blur(1px)) or (backdrop-filter: blur(1px))) {
  .kb-help-panel {
    background: color-mix(in srgb, var(--background-color-secondary) 95%, black);
  }
}

.kb-help-backdrop.visible .kb-help-panel {
  transform: none;
}

.kb-help-title {
  margin: 0 0 16px;
  font-size: 1.1rem;
  font-weight: 700;
}

.kb-help-list {
  margin: 0;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 10px 16px;
  align-items: center;
}

.kb-help-list dt {
  display: flex;
  gap: 4px;
  justify-content: flex-end;
}

.kb-help-list dd {
  margin: 0;
  color: var(--text-color-secondary);
  font-size: 0.9rem;
}

.kb-help-list kbd {
  display: inline-block;
  min-width: 1.6em;
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--glass-shadow-color, rgba(0, 0, 0, 0.15));
  border-bottom-width: 2px;
  background: var(--background-color);
  font-family: inherit;
  font-size: 0.82rem;
  font-weight: 700;
  text-align: center;
  line-height: 1.4;
}

/* Touch-first devices never see the trigger; belt-and-braces if it's ever
   opened programmatically on a narrow screen. */
@media (max-width: 599px) {
  .kb-help-backdrop { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  .kb-help-backdrop,
  .kb-help-panel { transition: none; }
}