/* ========================================
   Calendar Styles
   ======================================== */

/* Calendar Container */
.calendar-container {
  margin: var(--spacing-2xl) 0;
  padding-top: 200px; /* Space for floating filters */
}

/* Calendar Section Title */
.calendar-section-title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  text-align: left;
  margin-bottom: var(--spacing-2xl);
  margin-top: var(--spacing-3xl);
  color: var(--color-text-primary);
}

/* Calendar Header */
.calendar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-xl);
  flex-wrap: wrap;
  gap: var(--spacing-md);
}

.calendar-nav {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.calendar-title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin: 0;
  min-width: 250px;
  text-align: center;
}

.calendar-controls {
  display: flex;
  gap: var(--spacing-sm);
}

.calendar-view-toggle {
  display: flex;
  gap: var(--spacing-xs);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xs);
}

/* Calendar Grid */
.calendar-grid {
  display: grid;
  gap: var(--spacing-md);
  position: relative;
}

/* Week View */
.calendar-grid.week-view {
  grid-template-columns: repeat(7, 1fr);
}

/* Month View */
.calendar-grid.month-view {
  grid-template-columns: repeat(7, 1fr);
  grid-auto-rows: minmax(120px, auto);
}

/* Day Headers */
.calendar-day-header {
  text-align: center;
  padding: var(--spacing-md);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Calendar Day Cell */
.calendar-day {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md);
  min-height: 150px;
  position: relative;
  transition: all var(--transition-fast);
  cursor: pointer;
}

.calendar-day:hover {
  background: var(--color-bg-card-hover);
  border-color: var(--color-accent-orange);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.calendar-day.today {
  border-color: var(--color-accent-orange);
  box-shadow: 0 0 0 2px rgba(255, 140, 66, 0.2);
}

.calendar-day.past {
  opacity: 0.5;
  cursor: not-allowed;
}

.calendar-day.past:hover {
  transform: none;
  border-color: var(--color-border);
  box-shadow: none;
}

.calendar-day.empty {
  opacity: 0.3;
  cursor: default;
  pointer-events: none;
}

/* Day Number */
.day-number {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
}

.calendar-day.today .day-number {
  color: var(--color-accent-orange);
}

.day-date {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-md);
}

/* Availability Slots */
.availability-slots {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  max-height: 200px;
  overflow-y: auto;
}

.availability-slot {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-sm);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.availability-slot:hover {
  background: var(--color-bg-card);
  border-color: var(--color-accent-orange);
  transform: translateX(4px);
}

.slot-past {
  opacity: 0.5;
  cursor: not-allowed !important;
  pointer-events: none;
}

.slot-past:hover {
  transform: none;
  border-color: var(--color-border);
  background: var(--color-bg-secondary);
}

.slot-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-xs);
}

.slot-avatar {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  overflow: hidden;
  flex-shrink: 0;
}

.slot-avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.slot-info {
  flex: 1;
  min-width: 0;
}

.slot-student-name {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.slot-time {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
}

.slot-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: 2px var(--spacing-xs);
  background: rgba(255, 140, 66, 0.1);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-xs);
  color: var(--color-accent-orange);
}

/* Empty State */
.day-empty-state {
  text-align: center;
  padding: var(--spacing-lg);
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

/* Availability Count Badge */
.availability-count {
  position: absolute;
  top: var(--spacing-sm);
  right: var(--spacing-sm);
  background: var(--color-gradient-primary);
  color: var(--color-text-primary);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  padding: 4px var(--spacing-sm);
  border-radius: var(--radius-full);
  min-width: 24px;
  text-align: center;
}

/* Month View Specific */
.month-view .calendar-day {
  min-height: 120px;
}

.month-view .availability-slots {
  max-height: 80px;
}

.month-view .availability-slot {
  padding: var(--spacing-xs);
}

.month-view .slot-header {
  margin-bottom: 0;
}

.month-view .slot-avatar {
  width: 24px;
  height: 24px;
}

.month-view .slot-student-name {
  font-size: var(--font-size-xs);
}

.month-view .slot-time {
  display: none;
}

/* Week View Specific */
.week-view .calendar-day {
  min-height: 200px;
}

/* Loading State */
.calendar-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 400px;
}

/* Scrollbar Styling */
.availability-slots::-webkit-scrollbar {
  width: 4px;
}

.availability-slots::-webkit-scrollbar-track {
  background: transparent;
}

.availability-slots::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: var(--radius-sm);
}

.availability-slots::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-muted);
}

/* Responsive Adjustments */
@media (max-width: 1023px) {
  .calendar-header {
    flex-direction: column;
    align-items: stretch;
  }

  .calendar-title {
    text-align: center;
    font-size: var(--font-size-lg);
    min-width: auto;
  }

  .calendar-nav {
    justify-content: space-between;
    gap: var(--spacing-sm);
  }

  .calendar-nav .btn {
    padding: 0 var(--spacing-md);
    height: var(--button-height-sm);
    font-size: var(--font-size-sm);
    flex: 1;
    max-width: 120px;
  }

  .calendar-controls {
    justify-content: center;
    gap: var(--spacing-xs);
  }
}

@media (max-width: 639px) {
  .calendar-container {
    padding-top: 140px; /* Space for floating filters on mobile */
  }

  .calendar-section-title {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-lg);
    margin-top: var(--spacing-xl);
    text-align: left;
  }

  .calendar-header {
    gap: var(--spacing-sm);
  }

  .calendar-nav {
    order: 1;
    justify-content: space-between;
    align-items: center;
  }

  .calendar-nav .btn {
    padding: 0 var(--spacing-sm);
    height: 36px;
    font-size: var(--font-size-xs);
    flex: 0 0 auto;
    min-width: 80px;
    max-width: 90px;
  }

  .calendar-controls {
    order: 2;
    justify-content: space-between;
    width: 100%;
  }

  .calendar-grid.week-view,
  .calendar-grid.month-view {
    grid-template-columns: 1fr;
  }

  .calendar-day-header {
    display: none;
  }

  .calendar-day {
    min-height: auto;
  }

  .day-date {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
  }

  .availability-slots {
    max-height: none;
  }

  .calendar-title {
    font-size: var(--font-size-base);
    min-width: auto;
    white-space: nowrap;
    flex: 1;
    text-align: center;
  }

  .calendar-view-toggle {
    flex: 1;
  }

  .calendar-view-toggle .btn {
    flex: 1;
    padding: 0 var(--spacing-sm);
    height: 36px;
    font-size: var(--font-size-xs);
  }

  .calendar-controls .btn-sm {
    height: 36px;
    padding: 0 var(--spacing-md);
    font-size: var(--font-size-xs);
  }
}