/* ── 选题日历 (SPA 整合) ── */
#page-calendar .cal-layout { display: flex; gap: 24px; padding: 24px; max-width: 1200px; margin: 0 auto; }
#page-calendar .cal-main { flex: 1; }
#page-calendar .cal-sidebar { width: 320px; flex-shrink: 0; }
#page-calendar .cal-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; }
#page-calendar .cal-header h2 { margin: 0; font-size: 1.3rem; }
#page-calendar .cal-nav { display: flex; gap: 8px; }
#page-calendar .cal-nav button { padding: 6px 14px; border: 1px solid #d0d5dd; border-radius: 6px; background: #fff; cursor: pointer; }
#page-calendar .cal-nav button:hover { background: #f5f5f5; }
#page-calendar .cal-grid { display: grid; grid-template-columns: repeat(7, 1fr); gap: 4px; }
#page-calendar .cal-day-header { text-align: center; font-size: .75rem; color: #667085; padding: 8px 0; font-weight: 600; }
#page-calendar .cal-day { min-height: 80px; border: 1px solid #eaecf0; border-radius: 6px; padding: 6px; cursor: pointer; background: #fff; transition: box-shadow .15s; }
#page-calendar .cal-day:hover { box-shadow: 0 1px 6px rgba(0,0,0,.1); }
#page-calendar .cal-day.today { border-color: #2563eb; background: #eff6ff; }
#page-calendar .cal-day.other-month { opacity: .35; }
#page-calendar .cal-day .day-num { font-size: .8rem; font-weight: 600; color: #344054; margin-bottom: 4px; }
#page-calendar .cal-day .topic-chip { font-size: .7rem; background: #e0e7ff; color: #3730a3; padding: 2px 6px; border-radius: 4px; margin: 2px 0; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
#page-calendar .cal-day .topic-chip.done { background: #d1fae5; color: #065f46; }
#page-calendar .project-filter { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 16px; }
#page-calendar .project-filter button { padding: 4px 12px; border: 1px solid #d0d5dd; border-radius: 12px; background: #fff; cursor: pointer; font-size: .8rem; }
#page-calendar .project-filter button.active { background: #2563eb; color: #fff; border-color: #2563eb; }
#page-calendar .form-group { margin-bottom: 12px; }
#page-calendar .form-group label { display: block; font-size: .8rem; font-weight: 600; color: #344054; margin-bottom: 4px; }
#page-calendar .form-group input, #page-calendar .form-group select { width: 100%; padding: 8px 10px; border: 1px solid #d0d5dd; border-radius: 6px; font-size: .85rem; box-sizing: border-box; }
#page-calendar .today-list { background: #fff; border: 1px solid #eaecf0; border-radius: 8px; padding: 16px; }
#page-calendar .today-list h3 { margin: 0 0 12px 0; font-size: 1rem; }
#page-calendar .today-item { padding: 8px 0; border-bottom: 1px solid #f0f0f0; display: flex; justify-content: space-between; align-items: center; }
#page-calendar .today-item:last-child { border-bottom: none; }
#page-calendar .today-item .project-tag { font-size: .7rem; background: #f3e8ff; color: #6b21a8; padding: 2px 8px; border-radius: 8px; }
#page-calendar .quick-add-row { display: flex; gap: 8px; margin-top: 12px; }
#page-calendar .quick-add-row input { flex: 1; padding: 8px 10px; border: 1px solid #d0d5dd; border-radius: 6px; font-size: .85rem; }
#page-calendar .empty-state { text-align: center; color: #98a2b3; padding: 40px 0; font-size: .9rem; }