/* ---------- 日历组件 ---------- */
.calendar-dropdown {
  position: absolute; top: calc(100% + 4px); left: 0; background: var(--bg-card);
  border: 1px solid var(--border-color); border-radius: var(--radius-lg); box-shadow: var(--shadow-lg);
  min-width: 280px; max-width: 320px; padding: 1rem; z-index: var(--z-dropdown); display: none;
}
.calendar-dropdown.active { display: block; animation: calendarFadeIn 0.25s ease; }
.calendar-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.75rem; }
.calendar-nav-btn {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 0.4rem;
  cursor: pointer;
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  transition: all 0.2s ease;
  display: flex;
  align-items: center;
  justify-content: center;
}

.calendar-nav-btn:hover {
  background: var(--bg-tertiary);
  border-color: var(--primary-color);
  color: var(--primary-color);
}
.calendar-nav-btn svg {
  width: 16px;
  height: 16px;
  fill: currentColor;
  stroke: none;
  display: block;
}

.calendar-title { font-weight: 600; color: var(--text-primary); font-size: 1rem; }
.calendar-weekdays { display: grid; grid-template-columns: repeat(7, 1fr); text-align: center; font-weight: 600; font-size: 0.75rem; color: var(--text-secondary); padding: 0.4rem 0; }
.calendar-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 2px; }
.calendar-day { aspect-ratio: 1; display: flex; align-items: center; justify-content: center; font-size: 0.9rem; border-radius: var(--radius-sm); cursor: pointer; border: none; background: none; color: var(--text-primary); transition: all var(--transition-fast); }
.calendar-day:hover { background: var(--bg-secondary); }
.calendar-day.today { background: var(--primary-color); color: white; font-weight: 600; }
.calendar-day.selected { background: var(--secondary-color); color: white; font-weight: 600; }
.calendar-day.other-month { color: var(--text-muted); cursor: not-allowed; }
.calendar-day.disabled { color: var(--text-muted); opacity: 0.5; cursor: not-allowed; }
.calendar-footer { display: flex; justify-content: space-between; margin-top: 0.75rem; padding-top: 0.75rem; border-top: 1px solid var(--border-color); }
.calendar-today-btn { background: none; border: none; color: var(--primary-color); cursor: pointer; font-size: 0.85rem; padding: 0.3rem 0.75rem; border-radius: var(--radius-sm); transition: background var(--transition-fast); }
.calendar-today-btn:hover { background: var(--bg-secondary); }
.calendar-close-btn { background: var(--primary-color); color: white; border: none; padding: 0.3rem 0.75rem; border-radius: var(--radius-sm); cursor: pointer; font-size: 0.85rem; transition: background var(--transition-fast); }
.calendar-close-btn:hover { background: var(--secondary-color); }