/* The View panel (viewer/viewpanel.js): the view's controls in a compact panel docked in the 3D pane's
   bottom corner, translucent as the app's other panels, folding to its "View" button; on tablets and
   phones a bottom sheet. viewpanel.js sets its bottom offset, --vp-w (its width) and --vp-room (the
   height it may take) from the space it measures. Loaded after layout.css. */
.vp { position: absolute; left: 8px; bottom: 8px; z-index: 2; width: var(--vp-w, 300px); max-width: calc(100% - 16px);
  display: flex; flex-direction: column-reverse; align-items: flex-start; pointer-events: none; }
.vp[data-dock=right] { left: auto; right: 8px; align-items: flex-end; }
.vp > * { pointer-events: auto; }
.vp-btn { display: flex; align-items: center; gap: 10px; background: rgba(21, 23, 26, 0.88); color: var(--text); font: inherit; font-size: 12px;
  border: 1px solid var(--line); border-left: 2px solid var(--accent); padding: 4px 10px; cursor: pointer;
  text-transform: uppercase; letter-spacing: 0.15em; }
.vp-btn::after { content: '▴'; color: var(--accent); font-size: 10px; margin-left: auto; }
.vp-btn .ic { margin-right: -2px; }                       /* its icon (viewer/icons.js): gap is the flex gap */
.vp-btn:hover { color: var(--accent); }
.vp.vp-open .vp-btn { width: 100%; justify-content: flex-start; border-top-color: transparent; color: var(--dim); }
.vp.vp-open .vp-btn::after { content: '▾'; }
.vp-body { width: 100%; box-sizing: border-box; max-height: calc(var(--vp-room, 420px) - 30px); overflow-y: auto; overscroll-behavior: contain;
  padding: 8px 10px 6px; background: rgba(21, 23, 26, 0.88); border: 1px solid var(--line); border-left: 2px solid var(--accent); border-bottom: none; }
.vp-body[hidden], .vp-group[hidden] { display: none; }
.vp.vp-squeezed .vp-body { display: none; }
.vp.vp-squeezed .vp-btn { width: auto; border-top-color: var(--line); }
.vp-head { display: none; }
.vp-group:not(.vp-first) { margin-top: 8px; padding-top: 6px; border-top: 1px solid var(--line); }
.vp-h { color: var(--dim); font-size: 10px; text-transform: uppercase; letter-spacing: 0.15em; margin-bottom: 4px; }
.vp-items { display: flex; flex-wrap: wrap; gap: 4px; align-items: center; }
.vp-items > button, .vp-row > button { background: rgba(11, 12, 14, 0.6); color: var(--dim); border: 1px solid var(--line); font: inherit;
  padding: 3px 8px; cursor: pointer; text-transform: uppercase; letter-spacing: 0.08em; white-space: nowrap; }
.vp-items > button:hover:not(:disabled), .vp-row > button:hover:not(:disabled) { color: var(--text); }
.vp-items > button.on, .vp-row > button.on { color: var(--accent); border-color: var(--accent); }
.vp-items > button[hidden], .vp .vp-items > button:disabled, .vp .vp-row > button:disabled { display: none; }
.vp-row { display: flex; align-items: center; gap: 8px; width: 100%; }
.vp-items label, .vp-row label { display: flex; align-items: center; gap: 8px; flex: 1; min-width: 0; color: var(--dim);
  text-transform: uppercase; letter-spacing: 0.08em; font-size: 11px; }
.vp-items > label { flex: 1 1 100%; }
.vp-items label input[type=range], .vp-row label input[type=range] { flex: 1; min-width: 60px; width: auto; }
/* the overview's labelled choices (Size, Distance) as full-width rows */
.vp .ss-group { width: 100%; }
.vp .ss-lab { min-width: 58px; }
.vp .ss-group .seg button { padding: 3px 7px; }

/* ---- tablets and phones: open, a bottom sheet over the page (below the drawers, which have a scrim) */
.vp.vp-sheet.vp-open { position: fixed; left: 0; right: 0; bottom: 0; width: auto; max-width: none; z-index: 38; }
[data-lay=tab] .vp.vp-sheet.vp-open { left: max(8px, env(safe-area-inset-left)); right: auto; width: min(560px, calc(100vw - 16px)); }
.vp.vp-sheet.vp-open .vp-btn { display: none; }
.vp.vp-sheet .vp-body { max-height: min(48vh, 48dvh, var(--vp-room, 48vh)); border: 1px solid var(--line); border-top: 2px solid var(--accent);
  border-bottom: none; border-radius: 12px 12px 0 0; padding: 0 max(12px, env(safe-area-inset-right)) max(10px, env(safe-area-inset-bottom)) max(12px, env(safe-area-inset-left));
  background: rgba(21, 23, 26, 0.96); box-shadow: 0 0 32px rgba(0, 0, 0, 0.6); }
.vp.vp-sheet .vp-head { display: flex; align-items: center; justify-content: space-between; position: sticky; top: 0; z-index: 1;
  margin: 0 -12px 6px; padding: 14px 6px 4px 14px; background: inherit; border-bottom: 1px solid var(--line); border-radius: 12px 12px 0 0;
  color: var(--dim); text-transform: uppercase; letter-spacing: 0.15em; touch-action: none; }
.vp.vp-sheet .vp-head::before { content: ''; position: absolute; top: 6px; left: 50%; width: 44px; height: 4px; margin-left: -22px; border-radius: 2px; background: var(--line); }
.vp-x { min-width: 44px; min-height: 44px; background: none; border: 1px solid transparent; color: var(--text); font: 22px/1 system-ui, sans-serif; cursor: pointer; }
.vp-x:hover { color: var(--accent); }
/* touch targets of at least 40 px */
[data-lay=tab] .vp button, [data-lay=phone] .vp button { min-height: 40px; min-width: 40px; }
[data-lay=tab] .vp-btn, [data-lay=phone] .vp-btn { padding: 4px 14px; }