/* SBU Library Occupancy — all rules scoped under .sbu-occ */

.sbu-occ {
  --occ-green: #047857;
  --occ-amber: #92400e;
  --occ-red:   #991b1b;
  --occ-blue:  #2563eb;
  font-family: inherit;
  color: #1e293b;
  line-height: 1.5;
  box-sizing: border-box;
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
}
.sbu-occ *, .sbu-occ *::before, .sbu-occ *::after { box-sizing: border-box; }

.sbu-occ-heading { font-size: 1.25rem; font-weight: 800; margin: 0 0 1rem; color: #0f172a; }

.sbu-occ-sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* --- Layout --- */
.sbu-occ-layout { display: grid; grid-template-columns: 1fr; gap: 1.5rem; }
@media (min-width: 768px)  { .sbu-occ-layout { grid-template-columns: 340px 1fr; align-items: stretch; } }
@media (min-width: 1024px) { .sbu-occ-layout { grid-template-columns: 400px 1fr; } }

/* --- Room list --- */
.sbu-occ-room-list {
  display: flex; flex-direction: column; gap: 0.375rem;
  margin: 0; padding: 1rem;
  background: #fff; border: 1px solid #e2e8f0; border-radius: 1rem;
  box-shadow: 0 4px 20px -6px rgba(0,0,0,0.05);
}
@media (min-width: 768px) { .sbu-occ-room-list { position: sticky; top: 1rem; align-self: start; } }

.sbu-occ-room-tab {
  display: flex; align-items: center; justify-content: space-between;
  gap: 0.75rem; width: 100%; padding: 0.75rem 1rem;
  background: #fff; border: 2px solid transparent; border-radius: 0.75rem;
  cursor: pointer; font-family: inherit; font-size: 1rem; text-align: left;
  color: #334155; transition: background 0.12s, border-color 0.12s;
}
.sbu-occ-room-tab:hover { background: #eff6ff; border-color: #93c5fd; }
.sbu-occ-room-tab:hover .sbu-occ-room-tab-name { color: #1e40af; }
.sbu-occ-room-tab:focus-visible { outline: 2px solid var(--occ-blue); outline-offset: 2px; }
.sbu-occ-room-tab[aria-selected="true"] { background: #eff6ff; border-color: var(--occ-blue); color: #1e293b; }

.sbu-occ-room-tab-name { font-weight: 700; font-size: 1rem; line-height: 1.3; }
.sbu-occ-room-tab-pct  { font-weight: 800; font-size: 1rem; white-space: nowrap; flex-shrink: 0; }

/* Contrast-checked against both #fff and the #eff6ff selected background. */
.sbu-occ-room-tab-pct.is-green { color: var(--occ-green); }
.sbu-occ-room-tab-pct.is-amber { color: var(--occ-amber); }
.sbu-occ-room-tab-pct.is-red   { color: var(--occ-red); }

.sbu-occ-room-bar {
  height: 4px; background: #f1f5f9; border-radius: 2px;
  overflow: hidden; margin-top: 0.5rem; display: none;
}
.sbu-occ-room-bar-fill { height: 100%; border-radius: 2px; transition: width 0.6s ease; }
.sbu-occ-room-bar-fill.is-green { background: #059669; }
.sbu-occ-room-bar-fill.is-amber { background: #d97706; }
.sbu-occ-room-bar-fill.is-red   { background: #dc2626; }

@media (min-width: 768px) {
  .sbu-occ-room-tab { flex-wrap: wrap; padding: 0.875rem 1rem; }
  .sbu-occ-room-bar { display: block; width: 100%; }
}

/* --- Detail panel --- */
.sbu-occ-detail {
  background: #fff; border: 1px solid #e2e8f0; border-radius: 1rem;
  padding: 1.5rem; box-shadow: 0 4px 20px -6px rgba(0,0,0,0.05);
}
.sbu-occ-detail:focus-visible { outline: 2px solid var(--occ-blue); outline-offset: 2px; }
@media (min-width: 768px) { .sbu-occ-detail { padding: 2rem; } }

.sbu-occ-detail-top { display: flex; flex-direction: column; gap: 1rem; margin-bottom: 1.25rem; }
@media (min-width: 640px) {
  .sbu-occ-detail-top { flex-direction: row; justify-content: space-between; align-items: flex-start; }
}
.sbu-occ-detail-side { display: flex; flex-direction: column; align-items: flex-end; gap: 0.4rem; }

.sbu-occ-detail-name  { font-size: 1.125rem; font-weight: 800; margin: 0; color: #0f172a; }
.sbu-occ-detail-stats { margin-top: 0.25rem; }
.sbu-occ-detail-pct   { font-size: 1.5rem; font-weight: 900; color: #1e293b; line-height: 1; }
.sbu-occ-detail-seats { font-size: 1.125rem; font-weight: 800; display: block; margin-top: 0.3rem; }
.sbu-occ-detail-seats.is-green { color: #059669; }
.sbu-occ-detail-seats.is-amber { color: #b45309; }
.sbu-occ-detail-seats.is-red   { color: #dc2626; }

.sbu-occ-detail-compare { font-size: 1rem; font-weight: 700; margin: 0.35rem 0 0; color: #64748b; }
.sbu-occ-detail-compare.is-busier { color: #be123c; }
.sbu-occ-detail-compare.is-quieter { color: #059669; }

/* --- Controls --- */
.sbu-occ-controls { display: flex; align-items: center; gap: 0.5rem; }
.sbu-occ-last-sync {
  font-size: 0.8rem; font-weight: 700; color: #64748b;
  text-transform: uppercase; letter-spacing: 0.04em;
}
.sbu-occ-btn {
  padding: 0.4rem; background: #f8fafc; border: 1px solid #e2e8f0; border-radius: 0.375rem;
  color: #64748b; cursor: pointer; transition: background 0.15s, color 0.15s, border-color 0.15s;
  display: flex; align-items: center; justify-content: center;
}
.sbu-occ-btn:hover { background: var(--occ-blue); color: #fff; border-color: var(--occ-blue); }
.sbu-occ-btn:focus-visible { outline: 2px solid var(--occ-blue); outline-offset: 2px; }
.sbu-occ-pause[aria-pressed="true"] { background: #eff6ff; color: #1e40af; border-color: #93c5fd; }

.sbu-occ-day-label { font-size: 1rem; font-weight: 700; color: #475569; }

/* --- Legend --- */
.sbu-occ-legend { display: flex; gap: 1rem; margin-bottom: 0.75rem; }
.sbu-occ-legend-item { display: flex; align-items: center; gap: 0.35rem; }
.sbu-occ-legend-swatch { width: 14px; height: 3px; border-radius: 1px; background: #3b82f6; }
.sbu-occ-legend-dot { width: 8px; height: 8px; border-radius: 50%; background: #059669; }
.sbu-occ-legend-text {
  font-size: 14px; font-weight: 700; color: #475569;
  text-transform: uppercase; letter-spacing: 0.03em;
}

/* --- Chart --- */
.sbu-occ-canvas-wrap {
  width: 100%; position: relative; height: 220px;
  touch-action: pan-y; user-select: none;
}
@media (min-width: 640px) { .sbu-occ-canvas-wrap { height: 260px; } }
@media (min-width: 768px) { .sbu-occ-canvas-wrap { height: 300px; } }

.sbu-occ [hidden] { display: none !important; }

@media (prefers-reduced-motion: reduce) {
  .sbu-occ-room-bar-fill, .sbu-occ-room-tab, .sbu-occ-btn { transition: none; }
}