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

.pwa-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.pwa-status {
  display: inline-flex;
  align-items: center;
  min-height: var(--control-height);
  padding-inline: var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-surface-muted);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  font-weight: 700;
}

.pwa-status[data-state="offline"],
.pwa-status[data-state="warning"] {
  border-color: var(--color-warning);
  background: var(--color-warning-soft);
  color: var(--color-warning);
}

.favorite-toggle {
  min-height: var(--control-height);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-control);
  background: var(--color-surface);
  color: var(--color-text);
  font-weight: 750;
}

.favorite-toggle[aria-pressed="true"] {
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
  color: var(--color-accent);
}

.favorite-toggle:hover:not(:disabled) { border-color: var(--color-accent); }
.favorite-toggle:active:not(:disabled) { transform: translateY(1px); }

.catalog-card-actions,
.favorite-card-actions,
.history-card-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-top: var(--space-4);
}

.favorites-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-5);
}

.favorite-column {
  display: grid;
  align-content: start;
  gap: var(--space-4);
}

.favorite-column > h3 { margin: 0; }
.favorite-list { display: grid; gap: var(--space-3); }
.favorite-card { padding: var(--space-5); }
.favorite-card h4 { margin: 0 0 var(--space-2); }
.favorite-card p { margin: 0; color: var(--color-text-muted); }

.progress-heatmap-panel {
  display: grid;
  gap: var(--space-5);
  padding: var(--space-6);
}

.heatmap-header {
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  align-items: start;
  flex-wrap: wrap;
}

.heatmap-header h3,
.heatmap-header p { margin: 0; }
.heatmap-header p { color: var(--color-text-muted); }

.heatmap-scroll { overflow-x: auto; padding-bottom: var(--space-2); }
.heatmap-grid {
  min-width: 38rem;
  display: grid;
  grid-template-columns: repeat(7, minmax(2.5rem, 1fr));
  gap: var(--space-2);
}

.heatmap-weekday {
  min-height: 2rem;
  display: grid;
  place-items: center;
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  font-weight: 800;
}

.heatmap-cell,
.heatmap-placeholder {
  min-height: var(--control-height);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-control);
}

.heatmap-placeholder { border-color: transparent; }
.heatmap-cell {
  display: grid;
  place-items: center;
  background: var(--color-surface-muted);
  color: var(--color-text);
  font-size: var(--font-size-xs);
  font-weight: 800;
}

.heatmap-cell[data-level="1"] { background: var(--color-activity-1); }
.heatmap-cell[data-level="2"] { background: var(--color-activity-2); }
.heatmap-cell[data-level="3"] { background: var(--color-activity-3); color: var(--color-brand); }
.heatmap-cell[data-level="4"] { background: var(--color-activity-4); color: var(--color-on-brand); }

.heatmap-legend {
  display: flex;
  gap: var(--space-3);
  align-items: center;
  flex-wrap: wrap;
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
}

.heatmap-legend span::before {
  content: "";
  width: 0.85rem;
  height: 0.85rem;
  display: inline-block;
  margin-right: var(--space-1);
  border: 1px solid var(--color-border);
  border-radius: var(--space-1);
  vertical-align: -0.12rem;
  background: var(--color-surface-muted);
}

.heatmap-legend [data-level="1"]::before { background: var(--color-activity-1); }
.heatmap-legend [data-level="2"]::before { background: var(--color-activity-2); }
.heatmap-legend [data-level="3"]::before { background: var(--color-activity-3); }
.heatmap-legend [data-level="4"]::before { background: var(--color-activity-4); }

.offline-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: var(--space-6);
}

.offline-shell {
  width: min(100%, 42rem);
  display: grid;
  gap: var(--space-5);
  padding: var(--space-8);
}

.offline-shell h1,
.offline-shell p { margin: 0; }

@media (max-width: 760px) {
  .favorites-grid { grid-template-columns: 1fr; }
  .progress-heatmap-panel { padding: var(--space-4); }
}