/**
 * KCA Reservation System - Calendar Styles
 * Theme: Refined Elegance - Premium Minimal Light
 *
 * A sophisticated calendar component with subtle shadows,
 * elegant animations, and premium visual language.
 */

/* ═══════════════════════════════════════════════════════════
   CALENDAR CONTAINER
   ═══════════════════════════════════════════════════════════ */

.calendar-container {
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  animation: fadeInUp var(--duration-slow) var(--ease-out);
}

/* ═══════════════════════════════════════════════════════════
   CALENDAR HEADER
   ═══════════════════════════════════════════════════════════ */

.calendar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) var(--space-6);
  background: var(--gradient-secondary);
  position: relative;
  overflow: hidden;
}

.calendar-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 50% 80% at 20% 50%, rgba(255, 255, 255, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse 40% 60% at 80% 30%, rgba(212, 175, 55, 0.15) 0%, transparent 50%);
  pointer-events: none;
}

.calendar-nav {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  position: relative;
  z-index: 1;
}

.calendar-nav-btn {
  width: 44px;
  height: 44px;
  border: none;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-xl);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 20px;
  transition:
    background var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-spring),
    box-shadow var(--duration-fast) var(--ease-out);
}

.calendar-nav-btn:hover {
  background: rgba(255, 255, 255, 0.2);
  transform: scale(1.05);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
}

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

.calendar-title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: white;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.15);
  min-width: 180px;
  text-align: center;
}

/* Calendar Legend */
.calendar-legend {
  display: flex;
  gap: var(--space-5);
  font-size: var(--text-sm);
  position: relative;
  z-index: 1;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: rgba(255, 255, 255, 0.9);
}

.legend-dot {
  width: 14px;
  height: 14px;
  border-radius: var(--radius-full);
  border: 2px solid transparent;
}

.legend-dot.available {
  background: white;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

.legend-dot.unavailable {
  background: var(--color-neutral-400);
}

.legend-dot.booked {
  background: var(--color-danger-400);
}

.legend-dot.pending {
  background: var(--color-warning-400);
}

.legend-dot.today {
  background: white;
  border: 2px solid var(--color-primary-400);
}

/* ═══════════════════════════════════════════════════════════
   CALENDAR GRID
   ═══════════════════════════════════════════════════════════ */

.calendar-grid {
  background: white;
}

/* Calendar Weekdays Container */
.calendar-weekdays {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
}

/* Calendar Days Container */
.calendar-days {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
}

/* Calendar Weekdays */
.calendar-weekday {
  padding: var(--space-3) var(--space-2);
  text-align: center;
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-neutral-500);
  background: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-default);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
}

.calendar-weekday:first-child,
.calendar-weekday.sun {
  color: var(--color-danger-500);
}

.calendar-weekday:last-child,
.calendar-weekday.sat {
  color: var(--color-secondary-500);
}

/* ═══════════════════════════════════════════════════════════
   CALENDAR DAY CELLS
   ═══════════════════════════════════════════════════════════ */

.calendar-day {
  min-height: 110px;
  padding: var(--space-3);
  border-right: 1px solid var(--border-light);
  border-bottom: 1px solid var(--border-light);
  cursor: pointer;
  position: relative;
  background: var(--bg-card);
  transition:
    background var(--duration-fast) var(--ease-out),
    box-shadow var(--duration-fast) var(--ease-out);
  overflow: hidden;
}

.calendar-day:nth-child(7n) {
  border-right: none;
}

/* Hover Effect */
.calendar-day:hover:not(.disabled):not(.other-month) {
  background: var(--color-primary-50);
  z-index: 1;
}

/* Day States */
.calendar-day.other-month {
  background: var(--bg-tertiary);
  cursor: default;
}

.calendar-day.other-month .day-number {
  color: var(--color-neutral-300);
}

.calendar-day.disabled {
  background:
    repeating-linear-gradient(
      45deg,
      var(--color-neutral-100),
      var(--color-neutral-100) 8px,
      var(--color-neutral-50) 8px,
      var(--color-neutral-50) 16px
    );
  cursor: not-allowed;
}

.calendar-day.disabled::after {
  content: '';
  position: absolute;
  bottom: var(--space-2);
  right: var(--space-2);
  width: 18px;
  height: 18px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23a8a29e' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='12' cy='12' r='10'%3E%3C/circle%3E%3Cline x1='4.93' y1='4.93' x2='19.07' y2='19.07'%3E%3C/line%3E%3C/svg%3E");
  background-size: contain;
  background-repeat: no-repeat;
}

.calendar-day.today {
  background: linear-gradient(135deg, var(--color-secondary-50) 0%, var(--bg-card) 100%);
}

.calendar-day.today .day-number {
  background: var(--gradient-secondary);
  color: white;
  box-shadow: var(--shadow-secondary);
}

.calendar-day.selected {
  background: linear-gradient(135deg, var(--color-primary-100) 0%, var(--color-primary-50) 100%);
  box-shadow: inset 0 0 0 2px var(--color-primary-300);
}

.calendar-day.selected .day-number {
  background: var(--gradient-primary);
  color: white;
  box-shadow: var(--shadow-primary);
  transform: scale(1.1);
}

/* Day Number */
.day-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--text-primary);
  margin-bottom: var(--space-2);
  transition:
    background var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-spring),
    box-shadow var(--duration-fast) var(--ease-out);
}

.calendar-day:first-child .day-number,
.calendar-day:nth-child(7n+1) .day-number {
  color: var(--color-danger-500);
}

.calendar-day:nth-child(7n) .day-number {
  color: var(--color-secondary-500);
}

/* Day Status */
.day-status {
  font-size: var(--text-xs);
  line-height: 1.5;
}

.day-status-item {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-0\.5) 0;
}

.day-status-item::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: var(--radius-full);
}

.day-status-item.pending {
  color: var(--color-warning-600);
}

.day-status-item.pending::before {
  background: var(--color-warning-400);
}

.day-status-item.approved {
  color: var(--color-success-600);
}

.day-status-item.approved::before {
  background: var(--color-success-400);
}

.day-status-item.full {
  color: var(--color-danger-600);
  background: var(--color-danger-100);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  margin-top: var(--space-1);
}

.day-status-item.full::before {
  display: none;
}

/* ═══════════════════════════════════════════════════════════
   TIME SLOT PANEL
   ═══════════════════════════════════════════════════════════ */

.time-slot-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-default);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-lg);
  margin-top: var(--space-6);
  overflow: hidden;
  animation: fadeInUp var(--duration-slow) var(--ease-out);
}

.time-slot-header {
  padding: var(--space-5) var(--space-6);
  background: var(--gradient-secondary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  color: white;
  position: relative;
  overflow: hidden;
}

.time-slot-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 100% at 10% 50%, rgba(255, 255, 255, 0.06) 0%, transparent 50%);
  pointer-events: none;
}

.time-slot-date {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  position: relative;
  z-index: 1;
}

.time-slot-date svg {
  flex-shrink: 0;
}

.time-slot-header h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  position: relative;
  color: white;
  margin: 0;
}

.time-slot-header h3::before {
  content: '';
  width: 8px;
  height: 8px;
  background: var(--color-primary-400);
  border-radius: var(--radius-full);
  box-shadow: 0 0 10px var(--color-primary-400);
  animation: pulse 2s ease-in-out infinite;
}

.time-slot-selected {
  font-size: var(--text-sm);
  padding: var(--space-2) var(--space-4);
  background: rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-full);
  position: relative;
  z-index: 1;
}

.time-slot-body {
  padding: var(--space-6);
  background: var(--bg-card);
}

/* ═══════════════════════════════════════════════════════════
   TIME SLOTS GRID
   ═══════════════════════════════════════════════════════════ */

.time-slots-grid {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: var(--space-2);
}

.time-slot {
  padding: var(--space-3) var(--space-2);
  text-align: center;
  background: var(--bg-card);
  border: 2px solid var(--border-default);
  border-radius: var(--radius-lg);
  cursor: pointer;
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--text-secondary);
  position: relative;
  overflow: hidden;
  transition:
    background var(--duration-fast) var(--ease-out),
    border-color var(--duration-fast) var(--ease-out),
    transform var(--duration-fast) var(--ease-spring),
    box-shadow var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out);
}

.time-slot:hover:not(.disabled):not(.booked) {
  border-color: var(--color-primary-400);
  background: var(--color-primary-50);
  color: var(--color-primary-700);
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

.time-slot.disabled {
  background: var(--bg-tertiary);
  border-color: var(--border-light);
  color: var(--text-muted);
  cursor: not-allowed;
}

.time-slot.booked {
  background: var(--color-danger-50);
  border-color: var(--color-danger-200);
  color: var(--color-danger-600);
  cursor: not-allowed;
}

.time-slot.booked::before {
  content: '';
  position: absolute;
  top: 4px;
  right: 4px;
  width: 8px;
  height: 8px;
  background: var(--color-danger-400);
  border-radius: var(--radius-full);
}

.time-slot.booked.pending {
  background: var(--color-warning-50);
  border-color: var(--color-warning-200);
  color: var(--color-warning-600);
}

.time-slot.booked.pending::before {
  background: var(--color-warning-400);
  animation: pulse 2s ease-in-out infinite;
}

.time-slot.selected {
  background: var(--gradient-primary);
  border-color: transparent;
  color: white;
  box-shadow: var(--shadow-primary);
  transform: translateY(-2px);
}

.time-slot.in-range {
  background: var(--color-primary-100);
  border-color: var(--color-primary-300);
  color: var(--color-primary-700);
}

/* ═══════════════════════════════════════════════════════════
   TIME SELECTION INFO
   ═══════════════════════════════════════════════════════════ */

.time-selection-info {
  margin-top: var(--space-6);
  padding: var(--space-5);
  background: var(--color-primary-50);
  border: 1px solid var(--color-primary-200);
  border-radius: var(--radius-xl);
  animation: fadeIn var(--duration-normal) var(--ease-out);
}

.time-selection-info p {
  margin: var(--space-2) 0;
  font-size: var(--text-sm);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.time-selection-info p::before {
  content: '';
  width: 4px;
  height: 4px;
  background: var(--color-primary-500);
  border-radius: var(--radius-full);
}

.time-selection-info strong {
  color: var(--color-primary-600);
  font-weight: var(--font-semibold);
}

/* ═══════════════════════════════════════════════════════════
   TIME SLOT ACTIONS
   ═══════════════════════════════════════════════════════════ */

.time-slot-actions {
  margin-top: var(--space-6);
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
}

.time-slot-actions .btn {
  min-width: 120px;
}

/* ═══════════════════════════════════════════════════════════
   RESPONSIVE DESIGN
   ═══════════════════════════════════════════════════════════ */

@media (max-width: 992px) {
  .time-slots-grid {
    grid-template-columns: repeat(6, 1fr);
  }
}

@media (max-width: 768px) {
  .calendar-header {
    flex-direction: column;
    gap: var(--space-4);
    padding: var(--space-4);
  }

  .calendar-legend {
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-3);
  }

  .calendar-title {
    font-size: var(--text-xl);
  }

  .calendar-day {
    min-height: 80px;
    padding: var(--space-2);
  }

  .day-number {
    width: 28px;
    height: 28px;
    font-size: var(--text-xs);
  }

  .day-status {
    font-size: 10px;
  }

  .time-slots-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .time-slot {
    padding: var(--space-2);
    font-size: var(--text-xs);
  }

  .time-slot-header {
    flex-direction: column;
    gap: var(--space-2);
    text-align: center;
  }
}

@media (max-width: 480px) {
  .calendar-nav-btn {
    width: 36px;
    height: 36px;
  }

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

  .day-status {
    display: none;
  }

  .time-slots-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .legend-item span {
    display: none;
  }
}

/* ═══════════════════════════════════════════════════════════
   CALENDAR LOADING STATE
   ═══════════════════════════════════════════════════════════ */

.calendar-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 400px;
  background: var(--bg-card);
}

.calendar-loading::after {
  content: '';
  width: 48px;
  height: 48px;
  border: 3px solid var(--border-default);
  border-top-color: var(--color-primary-500);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

/* ═══════════════════════════════════════════════════════════
   NO SELECTION MESSAGE
   ═══════════════════════════════════════════════════════════ */

.no-date-selected {
  text-align: center;
  padding: var(--space-12) var(--space-6);
  color: var(--text-muted);
  background: var(--bg-secondary);
  border-radius: var(--radius-xl);
}

.no-date-selected svg {
  width: 64px;
  height: 64px;
  margin-bottom: var(--space-4);
  color: var(--color-neutral-300);
}

.no-date-selected h4 {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--text-secondary);
  margin-bottom: var(--space-2);
}

.no-date-selected p {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
}

/* ═══════════════════════════════════════════════════════════
   ANIMATIONS
   ═══════════════════════════════════════════════════════════ */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}