/* ============================================================
   CAMPUS SHEET
   A draggable glass panel over the campus map — a bottom sheet on
   mobile, a panel pinned to the right on desktop. Both drag the same
   way: grab the handle on top and pull up/down to expand/collapse,
   snapping to a collapsed "peek" or an expanded height. Sits above
   the map, below the header/footer/bottom-nav chrome — see
   components/campus-sheet.js for the drag physics.
   ============================================================ */

.campus-sheet {
  position: fixed;
  /* Symmetric on all three free edges — narrow enough that the sheet still
     fully contains the tabbar's own horizontal footprint (it's inset further
     in, by 1.75rem — see bottom-nav.css). */
  left: 8px;
  right: 8px;
  bottom: calc(8px + env(safe-area-inset-bottom));
  z-index: 1;

  display: flex;
  flex-direction: column;

  height: var(--campus-sheet-size, 192px);
  max-height: 85vh;
  border-radius: 28px;

  background: var(--glass-tint);
  box-shadow:
    0 0 0 0.1px var(--glass-outline),
    var(--glass-highlight),
    0 4px 40px 0 var(--glass-shadow-color);

  backdrop-filter: blur(var(--glass-blur-lg));
  -webkit-backdrop-filter: blur(var(--glass-blur-lg));

  will-change: height;
}

/* Outside 0.5px gradient stroke — same recipe as .header-button::after /
   .bn-tabbar::after in style.css / bottom-nav.css. */
.campus-sheet::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;
}

.campus-sheet-handle {
  flex: none;
  display: flex;
  align-items: center;
  justify-content: center;

  /* Generous hit area (the grabber itself is only 5px tall) so a thumb
     doesn't have to land pixel-perfect to start a drag. */
  padding: 1rem 0;
  touch-action: none;
  -webkit-tap-highlight-color: transparent;
  /* Native-app feel: no grab hand while dragging (see the cursor rule
     for custom scrubbers/handles in style.css). */
  cursor: default;
}

.campus-sheet-grabber {
  width: 36px;
  height: 5px;
  border-radius: var(--radius-pill, 999px);
  background: var(--glass-outline);
  opacity: 0.6;
}

.campus-sheet-content {
  flex: 1;
  min-height: 0;
  overflow: auto;
  padding: 0 1.25rem 1.25rem;
}

@media (min-width: 600px) {
  .campus-sheet {
    left: auto;
    right: 20px;
    bottom: 20px;

    width: 340px;
    height: var(--campus-sheet-size, 96px);
    max-height: calc(100dvh - var(--header-height, 84px) - 2rem - 40px);
    border-radius: 28px;
  }

  .campus-sheet-content {
    padding: 0 1.25rem 1.25rem;
  }
}