/* Go down and Go up (src/ui/walk.js). At the right edge, half way up, the same night glass as the
   tool bar; nothing else sits there at any width. While you are below (body.ebb-below) the shaping tools and undo are put away. */

.ebb-walk {
  --wk-btn: 48px;
  --wk-icon: 28px;
  --wk-edge: 12px;

  position: fixed;
  right: max(var(--wk-edge), env(safe-area-inset-right));
  top: 50%;
  transform: translateY(-50%);
  z-index: 10;
  pointer-events: none;
  /* Go down or Go up, and below it I'm stuck. */
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 8px;
}
.ebb-walk__btn[hidden] { display: none; }

.ebb-walk__btn {
  appearance: none;
  -webkit-appearance: none;
  pointer-events: auto;
  height: var(--wk-btn);
  min-width: var(--wk-btn);
  margin: 0;
  padding: 0 16px 0 11px;
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(30, 38, 36, 0.72);
  border: 1px solid rgba(244, 238, 228, 0.12);
  border-radius: 16px;
  box-shadow: 0 6px 24px rgba(10, 14, 13, 0.28);
  color: var(--ui-cream);
  font-family: var(--font-ui);
  font-weight: 600;
  font-size: var(--text-body);
  line-height: 1.2;
  white-space: nowrap;
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  transition: background-color 160ms ease;
}
@media (pointer: fine) {
  .ebb-walk__btn { -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px); }
}
.ebb-walk__btn:hover { background: rgba(48, 58, 55, 0.8); }
.ebb-walk__btn:focus-visible {
  outline: 2px solid var(--wordmark-dark);
  outline-offset: 2px;
}
.ebb-walk__icon { display: block; flex: none; width: var(--wk-icon); height: var(--wk-icon); }
.ebb-walk .icon { display: block; width: var(--wk-icon); height: var(--wk-icon); }

/* The ground bar (W4): along the bottom in the tool bar's place while you are below; each button
   an icon over its word, so four fit a 320 px window. */
.ebb-ground {
  --wk-icon: 26px;
  position: fixed;
  left: 50%;
  bottom: max(12px, env(safe-area-inset-bottom));
  transform: translateX(-50%);
  z-index: 10;
  display: flex;
  gap: 4px;
  padding: 6px;
  background: rgba(30, 38, 36, 0.72);
  border: 1px solid rgba(244, 238, 228, 0.12);
  border-radius: 18px;
  box-shadow: 0 6px 24px rgba(10, 14, 13, 0.28);
  max-width: calc(100vw - 24px);
}
.ebb-ground[hidden] { display: none; }
@media (pointer: fine) {
  .ebb-ground { -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px); }
}
.ebb-ground .ebb-walk__btn {
  flex-direction: column;
  justify-content: center;
  gap: 2px;
  height: auto;
  min-height: 56px;
  min-width: 64px;
  padding: 6px 8px;
  background: transparent;
  border: 0;
  border-radius: 12px;
  box-shadow: none;
  -webkit-backdrop-filter: none;
  backdrop-filter: none;
}
.ebb-ground .icon { display: block; width: var(--wk-icon); height: var(--wk-icon); }
.ebb-ground .ebb-walk__btn:hover { background: rgba(244, 238, 228, 0.1); }
.ebb-ground .ebb-walk__btn[aria-pressed='true'] { background: var(--wordmark-light); }
.ebb-ground .ebb-walk__name { font-size: var(--text-body); }
/* Narrow windows: the time button stacks above the bottom bar (time-flow.css); the ground bar is a
   little taller than the tool bar, so it steps up a little more. */
@media (max-width: 560px) {
  body.ebb-below .ebb-time { bottom: calc(max(12px, env(safe-area-inset-bottom)) + 84px); }
}

/* Sitting (the old seat): the buttons fade back, so the island is what you see. */
body.ebb-sitting #ebb-hud { opacity: 0.4; transition: opacity 600ms ease; }

/* Below: the shaping tools, undo and the brush card step away until you go up. */
body.ebb-below .ebb-tools,
body.ebb-below .ebb-history {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}
body.ebb-below .ebb-tools *,
body.ebb-below .ebb-history * { pointer-events: none; }