/* 文章发布日历 - 全年时间轴 */
.post-calendar {
  --calendar-cell: 13px;
  --calendar-gap: 3px;
  --calendar-step: calc(var(--calendar-cell) + var(--calendar-gap));
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg, 12px);
  padding: 20px;
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm, 0 2px 8px rgba(0,0,0,0.06));
}

.post-calendar-header {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-bottom: 18px;
}

.post-calendar-year {
  min-width: 92px;
  text-align: center;
  color: var(--text-primary);
  font-size: 17px;
  font-weight: 650;
  font-variant-numeric: tabular-nums;
}

.post-calendar-nav {
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  background: var(--bg-muted);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: transform 160ms cubic-bezier(0.16, 1, 0.3, 1), background 160ms ease, border-color 160ms ease, color 160ms ease;
}

.post-calendar-nav:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
  transform: translateY(-1px);
}

.post-calendar-nav:active { transform: scale(0.97); }

.post-calendar-body {
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr);
  gap: 8px;
  position: relative;
}

.post-calendar-body::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 24px;
  background: linear-gradient(to right, transparent, var(--bg-surface));
  pointer-events: none;
  opacity: 0;
}

.post-calendar-weekdays {
  display: flex;
  flex-direction: column;
  gap: var(--calendar-gap);
  padding-top: 20px;
  flex-shrink: 0;
}

.post-calendar-weekdays span {
  width: 18px;
  height: var(--calendar-cell);
  line-height: var(--calendar-cell);
  color: var(--text-tertiary);
  font-size: 10px;
  text-align: right;
}

.post-calendar-right {
  display: flex;
  flex-direction: column;
  min-width: 0;
  overflow-x: auto;
  overscroll-behavior-inline: contain;
  scrollbar-gutter: stable;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 8px;
}

.post-calendar-months {
  position: relative;
  width: calc(53 * var(--calendar-step));
  min-width: calc(53 * var(--calendar-step));
  height: 20px;
}

.post-calendar-month-label {
  position: absolute;
  top: 0;
  left: calc(var(--month-column) * var(--calendar-step));
  color: var(--text-tertiary);
  font-size: 10px;
  white-space: nowrap;
}

.post-calendar-grid {
  display: grid;
  width: max-content;
  grid-template-rows: repeat(7, var(--calendar-cell));
  grid-auto-flow: column;
  grid-auto-columns: var(--calendar-cell);
  gap: var(--calendar-gap);
}

.post-calendar-day {
  width: var(--calendar-cell);
  height: var(--calendar-cell);
  position: relative;
  box-sizing: border-box;
  border-radius: 3px;
  background: var(--bg-muted);
  cursor: default;
  transition: transform 120ms cubic-bezier(0.16, 1, 0.3, 1), outline-color 120ms ease;
}

.post-calendar-grid .post-calendar-day:hover {
  transform: scale(1.24);
  z-index: 1;
  outline: 1px solid var(--border-strong);
}

.post-calendar-day.level-1 { background: color-mix(in srgb, var(--color-primary) 25%, var(--bg-muted)); }
.post-calendar-day.level-2 { background: color-mix(in srgb, var(--color-primary) 50%, var(--bg-muted)); }
.post-calendar-day.level-3 { background: color-mix(in srgb, var(--color-primary) 76%, var(--bg-muted)); }
.post-calendar-day.level-4 { background: var(--color-primary); }

.post-calendar-day.today {
  outline: 2px solid var(--color-primary);
  outline-offset: 1px;
}

.post-calendar-day.other-year { opacity: 0.26; }

.post-calendar-legend {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 5px;
  margin-top: 12px;
  color: var(--text-tertiary);
  font-size: 11px;
}

.post-calendar-legend .post-calendar-day {
  --calendar-cell: 12px;
  cursor: default;
}

.post-calendar-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--border-color);
}

.post-calendar-stat { text-align: center; }

.post-calendar-stat-value {
  display: block;
  margin-bottom: 3px;
  color: var(--color-primary);
  font-size: 22px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

.post-calendar-stat-label {
  color: var(--text-tertiary);
  font-size: 12px;
}

.post-calendar-tooltip {
  position: fixed;
  z-index: 10000;
  padding: 7px 10px;
  border: 1px solid var(--border-color);
  border-radius: 7px;
  background: var(--text-primary);
  color: var(--bg-surface);
  box-shadow: 0 6px 18px rgba(0,0,0,0.16);
  font-size: 12px;
  white-space: nowrap;
  pointer-events: none;
}

@media (max-width: 768px) {
  .post-calendar {
    --calendar-cell: 11px;
    --calendar-gap: 3px;
    padding: 16px 14px;
    border-radius: 10px;
  }

  .post-calendar-header { margin-bottom: 14px; }

  .post-calendar-body::after { opacity: 1; }

  .post-calendar-right {
    padding-bottom: 10px;
    scroll-snap-type: x proximity;
  }

  .post-calendar-grid { scroll-snap-align: start; }

  .post-calendar-weekdays span { font-size: 9px; }

  .post-calendar-stats { gap: 6px; }

  .post-calendar-stat-value { font-size: 19px; }
  .post-calendar-stat-label { font-size: 11px; }
}

@media (max-width: 390px) {
  .post-calendar { margin-inline: -2px; }
  .post-calendar-year { min-width: 80px; font-size: 16px; }
}

@media (prefers-reduced-motion: reduce) {
  .post-calendar-nav,
  .post-calendar-day { transition: none; }
  .post-calendar-grid .post-calendar-day:hover { transform: none; }
}