/* ---------- 日历组件（对齐九宫格磨砂质感） ---------- */
.calendar-dropdown {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(16px) saturate(150%);
  -webkit-backdrop-filter: blur(16px) saturate(150%);
  border: 1px solid rgba(255, 255, 255, 0.5);
  border-radius: var(--radius-lg);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
  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: rgba(37, 99, 235, 0.04);
  border: 1px solid transparent;
  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: rgba(37, 99, 235, 0.1);
  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: rgba(37, 99, 235, 0.1); }
.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 rgba(37, 99, 235, 0.1); }

.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: rgba(37, 99, 235, 0.1); }

.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); }

/* 深色模式适配 */
body.dark-theme .calendar-dropdown { background: rgba(30, 34, 41, 0.85); border-color: rgba(255, 255, 255, 0.1); }