/* ==========================================================================
   calendar.css — Month grid, day cells, event pills, agenda view, modal
   UI/UX Pro Max — CSS Grid 7-column calendar with Notion/Linear polish
   ========================================================================== */

/* ---------- Calendar Container ---------- */
.calendar-wrap {
  background: var(--surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-light);
  box-shadow: var(--shadow-xs);
  overflow: hidden;
}

/* ---------- Calendar Header ---------- */
.calendar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg) var(--space-xl);
  border-bottom: 1px solid var(--border-light);
}

.calendar-title {
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.02em;
}

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

.calendar-nav-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 150ms ease;
}

.calendar-nav-btn:hover {
  background: var(--surface-hover);
  color: var(--text);
  border-color: var(--primary-500);
}

.calendar-nav-btn:focus-visible {
  box-shadow: var(--focus-ring);
}

.calendar-nav-btn:active {
  transform: scale(0.95);
}

.calendar-nav-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.calendar-nav-btn svg {
  width: 16px;
  height: 16px;
}

.calendar-today-btn {
  height: 32px;
  padding: 0 14px;
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--primary-500);
  background: var(--primary-50);
  border: 1px solid var(--primary-100);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 150ms ease;
}

.calendar-today-btn:hover {
  background: var(--primary-100);
  border-color: var(--primary-500);
}

.calendar-today-btn:focus-visible {
  box-shadow: var(--focus-ring);
}

.calendar-today-btn:active {
  transform: scale(0.97);
}

.calendar-today-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* ---------- View Toggle ---------- */
.calendar-views {
  display: flex;
  gap: var(--space-xs);
  padding: 0 var(--space-xl) var(--space-md);
}

.calendar-view-btn {
  padding: 5px 14px;
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--text-secondary);
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 150ms ease;
}

.calendar-view-btn:hover {
  background: var(--surface-hover);
  color: var(--text);
}

.calendar-view-btn:focus-visible {
  box-shadow: var(--focus-ring);
}

.calendar-view-btn:active {
  background: var(--gray-200);
}

.calendar-view-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.calendar-view-btn.active {
  color: var(--primary-500);
  background: var(--primary-50);
  border-color: var(--primary-100);
  font-weight: 600;
}

/* ---------- Month Grid Container ---------- */
.calendar-grid {
  /* wrapper only — actual grid is .calendar-table inside */
}

/* ---------- Toggle Switch ---------- */
.cal-switch {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  user-select: none;
}

.cal-switch input { display: none; }

.cal-switch-track {
  position: relative;
  width: 36px;
  height: 20px;
  background: #D1D5DB;
  border-radius: 10px;
  transition: background 200ms ease;
}

.cal-switch-track::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  background: white;
  border-radius: 50%;
  transition: transform 200ms ease;
  box-shadow: 0 1px 2px rgba(0,0,0,0.15);
}

.cal-switch input:checked + .cal-switch-track {
  background: #4F46E5;
}

.cal-switch input:checked + .cal-switch-track::after {
  transform: translateX(16px);
}

/* Weekday header */
.calendar-weekday {
  padding: var(--space-sm) var(--space-xs);
  font-size: 12px;
  font-weight: 600;
  text-align: center;
  color: #6B7280;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: #F9FAFB;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Weekend header = red */
.calendar-weekday.weekend {
  color: #EF4444;
  opacity: 0.8;
}

/* ---------- Day Cells ---------- */
.calendar-day {
  min-height: 90px;
  padding: 6px 8px;
  background: white;
  cursor: pointer;
  transition: box-shadow 150ms ease;
  position: relative;
}

.calendar-day:hover {
  box-shadow: inset 0 0 0 1px rgba(99, 102, 241, 0.15);
}

.calendar-day:focus-visible {
  box-shadow: inset var(--focus-ring);
}

/* Today */
.calendar-day.today {
  border-left: 3px solid #6366F1;
  background: rgba(238, 242, 255, 0.03);
}

/* Other month days */
.calendar-day.other-month {
  opacity: 0.3;
  background: #F9FAFB;
}

/* Weekend columns */
.calendar-day.weekend {
  background: rgba(0, 0, 0, 0.008);
}

.calendar-day.weekend.today {
  background: rgba(238, 242, 255, 0.03);
}

/* Day number */
.calendar-day-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  font-size: 13px;
  font-weight: 500;
  color: #374151;
  border-radius: 50%;
  margin: 2px;
  transition: all 150ms ease;
}

.calendar-day:hover .calendar-day-number {
  color: var(--text);
}

/* Today number — white on indigo circle */
.calendar-day.today .calendar-day-number {
  background: #6366F1;
  color: #FFFFFF;
  font-weight: 700;
  width: 24px;
  height: 24px;
  box-shadow: 0 2px 4px rgba(99, 102, 241, 0.3);
}

/* ---------- Event Pills ---------- */
.calendar-events {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 2px 0;
  margin-top: 6px;
}

.event-pill {
  display: block;
  padding: 4px 8px;
  font-size: 12px;
  font-weight: 500;
  line-height: 1.5;
  border-radius: 4px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  cursor: pointer;
  transition: all 150ms ease;
  border-left: 2px solid transparent;
  margin-bottom: 0;
}

.event-pill:hover {
  opacity: 0.85;
  transform: translateX(1px);
}

.event-pill:focus-visible {
  box-shadow: var(--focus-ring);
}

.event-pill:active {
  transform: scale(0.98);
}

/* Pending — indigo */
.event-pill.event-pending {
  border-left-color: #6366F1;
  background: #EEF2FF;
  color: #3730A3;
}

/* Todo events */
.event-pill.event-todo {
  border-left-color: #6366F1;
  background: var(--primary-100);
  color: var(--primary-700);
}

/* Reminder events */
.event-pill.event-reminder {
  border-left-color: var(--warning-500);
  background: var(--warning-50);
  color: #92400E;
}

/* Deadline events */
.event-pill.event-deadline {
  border-left-color: var(--danger-500);
  background: var(--danger-50);
  color: #991B1B;
}

/* Meeting events */
.event-pill.event-meeting {
  border-left-color: var(--info-500);
  background: var(--info-50);
  color: #1E40AF;
}

/* Done — gray, strikethrough */
.event-pill.event-done {
  border-left-color: #D1D5DB;
  background: #F9FAFB;
  color: #9CA3AF;
  text-decoration: line-through;
}

/* More events indicator */
.event-more {
  font-size: 10px;
  font-weight: 500;
  color: var(--text-muted);
  text-align: center;
  padding: 2px 0;
  cursor: pointer;
  border-radius: 3px;
  transition: all 150ms ease;
}

.event-more:hover {
  color: var(--primary-500);
  background: var(--primary-50);
}

.event-pill.event-more {
  font-size: 10px;
  color: var(--gray-400);
  padding: 1px 6px;
  border-left: none;
}

/* ---------- Calendar Table ---------- */
.calendar-table {
  width: 100%;
  border: 1px solid #E5E7EB;
  border-radius: 6px;
  overflow: hidden;
}

.calendar-header-row {
  display: flex;
}

.calendar-header-cell {
  flex: 1;
  min-width: 0;
  padding: 8px 4px;
  font-size: 12px;
  font-weight: 600;
  text-align: center;
  color: #6B7280;
  background: #F9FAFB;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid #E5E7EB;
}

.calendar-header-cell.weekend {
  color: #EF4444;
}

.calendar-week-row {
  display: flex;
  height: 100px;
  border-bottom: 1px solid #E5E7EB;
}
.calendar-week-row:last-child {
  border-bottom: none;
}

/* Full mode — rows expand to fit all events */
.calendar-table.calendar-full .calendar-week-row {
  height: auto;
  min-height: 100px;
}

.calendar-day-cell {
  flex: 1;
  min-width: 0;
  background: white;
  padding: 8px;
  overflow: hidden;
  cursor: pointer;
  transition: box-shadow 150ms ease;
  border-right: 1px solid #E5E7EB;
}
.calendar-day-cell:last-child {
  border-right: none;
}

/* Full mode — allow content to expand cell */
.calendar-full .calendar-day-cell {
  overflow: visible;
}

.calendar-day-cell.other-month {
  opacity: 0.3;
  background: #F9FAFB;
  cursor: default;
}

/* Today */
.calendar-day-cell.today {
  background: white;
}

.calendar-day-cell.cal-clickable {
  cursor: pointer;
}

.calendar-day-cell.cal-clickable:hover {
  box-shadow: inset 0 0 0 1px rgba(99, 102, 241, 0.15);
}

.calendar-day-cell.cal-clickable:focus-visible {
  box-shadow: inset var(--focus-ring);
}

.day-number {
  font-weight: 600;
  font-size: 13px;
  color: #374151;
}

/* Today number — indigo text on soft circle */
.day-number.day-today {
  background: #4F46E5;
  color: #FFFFFF;
  border-radius: 50%;
  width: 26px;
  height: 26px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
}

.day-number.day-weekend {
  color: #EF4444;
}

/* Today 優先於 weekend — 確保藍底白字 */
.day-number.day-today.day-weekend {
  background: #4F46E5;
  color: #FFFFFF;
}

.day-events {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: 4px;
  padding-bottom: 2px;
}

/* ---------- Calendar Toolbar ---------- */
.calendar-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
}

.calendar-month-title {
  margin: 0;
  font-size: 1.2em;
  font-weight: 700;
  text-align: center;
  white-space: nowrap;
  color: var(--text);
  letter-spacing: -0.02em;
}

/* ---------- Agenda View ---------- */
.agenda-list {
  padding: var(--space-lg);
}

.agenda-date-group {
  margin-bottom: var(--space-xl);
}

.agenda-date {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text);
  padding: var(--space-sm) var(--space-md);
  background: #F9FAFB;
  border-radius: var(--radius);
  margin-bottom: var(--space-sm);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.agenda-date .weekday {
  font-weight: 400;
  color: var(--text-muted);
}

.agenda-date .today-badge {
  font-size: 10px;
  font-weight: 600;
  color: #6366F1;
  background: #EEF2FF;
  padding: 1px 8px;
  border-radius: var(--radius-full);
}

.agenda-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius);
  transition: background 150ms ease;
  cursor: pointer;
}

.agenda-item:hover {
  background: #F9FAFB;
}

.agenda-item:focus-visible {
  box-shadow: var(--focus-ring);
}

.agenda-item:active {
  background: var(--gray-100);
}

.agenda-item:nth-child(even) {
  background: rgba(0, 0, 0, 0.01);
}

.agenda-item:nth-child(even):hover {
  background: #F9FAFB;
}

.agenda-dot {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  margin-top: 6px;
  flex-shrink: 0;
}

.agenda-dot.dot-todo { background: #6366F1; }
.agenda-dot.dot-reminder { background: var(--warning-500); }
.agenda-dot.dot-deadline { background: var(--danger-500); }
.agenda-dot.dot-meeting { background: var(--info-500); }
.agenda-dot.dot-done { background: var(--success-500); }

.agenda-item-content {
  flex: 1;
  min-width: 0;
}

.agenda-item-title {
  font-size: var(--text-sm);
  color: var(--text);
  line-height: var(--leading-normal);
}

.agenda-item-project {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 1px;
}

.agenda-item-time {
  font-size: 11px;
  color: var(--text-muted);
  white-space: nowrap;
  flex-shrink: 0;
  margin-top: 2px;
}

/* ---------- Agenda Filters ---------- */
.agenda-filters .btn-group {
  display: inline-flex;
  gap: 2px;
}

/* ---------- Calendar Empty ---------- */
.calendar-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-3xl) var(--space-xl);
  text-align: center;
  color: var(--text-muted);
}

.calendar-empty svg {
  width: 48px;
  height: 48px;
  color: var(--gray-300);
  margin-bottom: var(--space-lg);
}

/* ---------- Calendar Modal ---------- */
.calendar-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  animation: cal-modal-overlay-in 0.2s ease;
}

.calendar-modal {
  background: var(--surface);
  border-radius: var(--radius-xl);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  width: 90%;
  max-width: 480px;
  max-height: 80vh;
  overflow-y: auto;
  animation: cal-modal-slide-in 0.2s cubic-bezier(0.21, 1.02, 0.73, 1);
}

@keyframes cal-modal-overlay-in {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes cal-modal-slide-in {
  from {
    opacity: 0;
    transform: translateY(12px) scale(0.96);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .calendar-day {
    min-height: 60px;
  }

  .calendar-day-cell {
    min-height: 60px;
  }

  .event-pill {
    font-size: 9px;
    padding: 1px 4px;
  }

  .calendar-day-number {
    width: 22px;
    height: 22px;
    font-size: 10px;
  }

  .calendar-header {
    flex-wrap: wrap;
    gap: var(--space-sm);
  }
}