/* === CSS変数定義 === */
:root {
  --color-text-main: #141415;
  --color-text-muted: #5B5F66;
  --color-text-sub: #3B4147;
  --color-text-light: #A0A7B3;
  --color-bg-input: #F0F1F4;
  --color-primary: rgba(201, 217, 255, 0.8);
  --color-primary-bg: #E6F0FF;
  --color-selected-bg: rgba(201, 217, 255, 0.8);
  --color-selected-text: #FAFBFD;
}

/* === カレンダー固有スタイル === */
.date-popup { 
  width: 280px; 
  padding: 0.5rem; 
}

.calendar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.calendar-title { 
  font-size: 0.875rem; 
  font-weight: 600; 
  color: var(--color-text-main); 
}

.icon-btn {
  padding: 0.25rem;
  border-radius: 0.375rem;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  transition: background-color 0.2s;
}

.icon-btn:hover { 
  background-color: var(--color-bg-input); 
}

.weekday-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 0.25rem;
  margin-bottom: 0.5rem;
}

.weekday { 
  text-align: center; 
  font-size: 0.625rem; 
  font-weight: 600; 
  color: var(--color-text-muted); 
}

.weekday.sun { 
  color: #ef4444; 
}

.weekday.sat { 
  color: #3b82f6; 
}

.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 0.25rem;
  justify-items: center;
}

.date-cell {
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  border-radius: 0.375rem;
  cursor: pointer;
  transition: background-color 0.2s, color 0.2s;
}

.date-cell.current-month { 
  color: var(--color-text-sub); 
}

.date-cell.current-month:hover { 
  background-color: var(--color-bg-input); 
}

.date-cell.other-month { 
  color: var(--color-text-light); 
}

.date-cell.other-month:hover { 
  background-color: var(--color-bg-input); 
}

.date-cell.today { 
  color: #324C7D; 
  font-weight: bold; 
  background-color: transparent; 
  border: 2px solid #324C7D;
}

.date-cell.today:hover { 
  background-color: rgba(220, 223, 229, 0.3); 
}

.date-cell.selected { 
  background-color: #324C7D; 
  color: #FFFFFF; 
  font-weight: bold; 
  border: 2px solid #324C7D;
}

.date-cell.selected:hover { 
  background-color: #1F3A5F; 
}