/* date-header — modern date column header */

.date-header-root {
  width: var(--cell-width);
  min-width: var(--cell-width);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
  height: var(--h-dates);
  border-right: 1px solid var(--border-color-light);
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  background: var(--background-secondary);
  cursor: pointer;
}

.date-header-root:hover {
  background: var(--hover-bg);
  transform: translateY(-1px);
  box-shadow: 0 2px 4px -1px rgba(0, 0, 0, 0.1);
  z-index: 5;
}

.date-header-bg-weekend { 
  background-color: var(--background-tertiary) !important;
}
.date-header-text-sat   { 
  color: var(--success-color) !important;
  font-weight: 600 !important;
}
.date-header-text-sun   { 
  color: var(--danger-color) !important;
  font-weight: 600 !important;
}

.date-header-reading-active {
  background-color: rgba(255, 249, 196, 0.9) !important;
  border-bottom: 2px solid var(--warning-color);
  box-shadow: inset 0 -2px 0 var(--warning-color);
}

.date-header-col-hovered {
  background-color: var(--highlight-bg) !important;
  box-shadow: inset 1px 0 0 var(--highlight-border), inset -1px 0 0 var(--highlight-border);
  z-index: 10;
}

.date-header-hover-trigger .date-header-highlight-btn {
  opacity: 0;
  transition: opacity 0.2s ease, transform 0.2s ease;
  transform: scale(0.9);
}
.date-header-hover-trigger:hover .date-header-highlight-btn,
.date-header-highlight-btn.date-header-is-active {
  opacity: 1;
  transform: scale(1);
}

.date-header-active-bar {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--primary-color), var(--info-color));
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  animation: active-bar-pulse 2s ease-in-out infinite;
}

@keyframes active-bar-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

.date-header-day {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1;
  margin-bottom: var(--spacing-xs);
}

.date-header-month {
  font-size: 10px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-xs);
}

.date-header-weekday {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.date-header-today {
  background: linear-gradient(135deg, rgba(79, 70, 229, 0.1), rgba(14, 165, 233, 0.1)) !important;
  border: 1px solid rgba(79, 70, 229, 0.2) !important;
  box-shadow: 0 2px 6px -1px rgba(79, 70, 229, 0.2) !important;
}

.date-header-today .date-header-day {
  color: var(--primary-color) !important;
}

.date-header-today .date-header-month {
  color: var(--primary-dark) !important;
}

.date-header-today .date-header-weekday {
  color: var(--info-color) !important;
}

.date-header-highlight-btn {
  position: absolute;
  top: var(--spacing-xs);
  right: var(--spacing-xs);
  width: 20px;
  height: 20px;
  border-radius: var(--radius-rounded);
  background: var(--background-primary);
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  cursor: pointer;
  transition: all 0.2s ease;
  z-index: 15;
}
.date-header-highlight-btn:hover {
  background: var(--primary-light);
  color: var(--primary-color);
  border-color: var(--primary-color);
  transform: scale(1.1);
}

.date-header-highlight-btn.date-header-is-active {
  background: var(--warning-color);
  color: var(--text-white);
  border-color: var(--warning-color);
}

/* Mobile optimizations */
@media (max-width: 599px) {
  .date-header-root {
    height: calc(var(--h-dates) - 8px);
  }
  
  .date-header-day {
    font-size: 16px;
  }
  
  .date-header-month {
    font-size: 9px;
  }
  
  .date-header-weekday {
    font-size: 10px;
  }
}