/* ==========================================================================
   Component: Calendar
   Description: Month/week grid for date-mapped events.
   Used for participation scheduling and history views.
   ========================================================================== */

/* --- Container --- */
.calendar {
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background-color: var(--surface-base);
}

/* --- Toolbar (month/year + navigation + view toggle) --- */
.calendar__toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) var(--space-3);
  border-bottom: 1px solid var(--border-subtle);
  background-color: var(--surface-raised);
}

.calendar__title {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text-primary);
}

.calendar__nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.calendar__nav-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border: none;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
}

.calendar__nav-btn:hover {
  background-color: var(--surface-hover);
  color: var(--text-primary);
}

.calendar__nav-btn .material-symbols-rounded {
  font-size: 18px;
}

.calendar__view-toggle {
  display: flex;
  gap: 0;
  border: 1px solid var(--border-default);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.calendar__view-btn {
  padding: var(--space-0-5) var(--space-2);
  border: none;
  background: transparent;
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
}

.calendar__view-btn:not(:last-child) {
  border-right: 1px solid var(--border-default);
}

.calendar__view-btn--active {
  background-color: var(--accent-primary);
  color: var(--text-on-accent);
}

/* --- Day-of-week header --- */
.calendar__header {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  border-bottom: 1px solid var(--border-subtle);
}

.calendar__header-cell {
  padding: var(--space-1-5) var(--space-1);
  text-align: center;
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-tertiary);
}

/* --- Month grid --- */
.calendar__grid {
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
}

/* --- Individual date cell --- */
.calendar__cell {
  min-width: 0;
  min-height: 80px;
  padding: var(--space-1);
  border-bottom: 1px solid var(--border-subtle);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  gap: var(--space-0-5);
}

/* Remove right border on last column */
.calendar__cell:nth-child(7n) {
  border-right: none;
}

/* Remove bottom border on last row */
.calendar__grid:last-child .calendar__cell:nth-last-child(-n+7) {
  border-bottom: none;
}

.calendar__date {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--text-secondary);
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

/* Dates outside current month */
.calendar__cell--outside .calendar__date {
  color: var(--text-disabled);
}

/* Today indicator */
.calendar__cell--today .calendar__date {
  background-color: var(--accent-primary);
  color: var(--text-on-accent);
  font-weight: 700;
}

/* --- Event (card rendered inside a cell) --- */
.calendar__event {
  padding: 2px var(--space-1);
  border-radius: var(--radius-sm);
  font-size: 10px;
  font-weight: 500;
  line-height: 1.4;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  cursor: pointer;
  transition: opacity var(--duration-fast) var(--ease-out);
}

.calendar__event:hover {
  opacity: 0.85;
}

/* Event status colors */
.calendar__event--completed {
  background-color: var(--status-success-bg);
  color: var(--status-success-text);
}

.calendar__event--active {
  background-color: var(--accent-subtle);
  color: var(--accent-primary);
}

.calendar__event--pending {
  background-color: var(--surface-sunken);
  color: var(--text-secondary);
}

.calendar__event--expired {
  background-color: var(--status-error-bg);
  color: var(--status-error-text);
}

/* --- Multi-day span indicator --- */
.calendar__span {
  padding: 2px var(--space-1);
  font-size: 10px;
  font-weight: 500;
  line-height: 1.4;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  cursor: pointer;
}

.calendar__span--start {
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
  padding-right: 0;
}

.calendar__span--middle {
  border-radius: 0;
  padding-left: var(--space-0-5);
  padding-right: 0;
}

.calendar__span--end {
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding-left: var(--space-0-5);
}

/* --- Week view (taller cells, fewer rows) --- */
.calendar--week .calendar__cell {
  min-height: 120px;
}

/* --- Compact variant (for aside panels / narrow contexts) --- */
.calendar--compact .calendar__cell {
  min-height: 56px;
  padding: 2px;
}

.calendar--compact .calendar__date {
  font-size: 10px;
  width: 18px;
  height: 18px;
}

.calendar--compact .calendar__event {
  font-size: 9px;
  padding: 1px 3px;
}

.calendar--compact .calendar__toolbar {
  padding: var(--space-1-5) var(--space-2);
}

/* --- Responsive: collapse to list on narrow screens --- */
@media (max-width: 639px) {
  .calendar__header {
    display: none;
  }

  .calendar__grid {
    display: flex;
    flex-direction: column;
  }

  .calendar__cell {
    min-height: auto;
    padding: var(--space-2) var(--space-3);
    border-right: none;
    flex-direction: row;
    align-items: center;
    gap: var(--space-2);
  }

  .calendar__cell--outside {
    display: none;
  }

  .calendar__date {
    min-width: 28px;
    font-size: var(--text-xs);
  }

  .calendar__event {
    font-size: var(--text-xs);
  }
}