/* 月份在普通/周视图中均由内容撑高；ID 优先级覆盖 plan-overview.css 的 640px 限高。 */
#timeline-content .timeline-month-section:not(.collapsed) > .timeline-month-body,
#stu-timeline-container .stu-tl-month:not(.collapsed) > .stu-tl-body {
  max-height: none;
  height: auto;
  overflow-y: visible;
}

/* 折叠月份仍需真正收起，不能被 plan-overview.css 的限高规则覆盖。 */
#timeline-content .timeline-month-section.collapsed > .timeline-month-body,
#stu-timeline-container .stu-tl-month.collapsed > .stu-tl-body {
  max-height: 0;
  height: 0;
  padding-top: 0;
  padding-bottom: 0;
  opacity: 0;
  overflow: hidden;
}

.plan-task-link {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 10px;
  margin: 4px 8px 8px 44px;
  padding: 7px 10px;
  border-radius: 8px;
  background: #f4f7ff;
  color: #344054;
  font-size: 12px;
  line-height: 1.5;
  flex: 0 0 calc(100% - 52px);
}
.timeline-month-item:has(> .plan-task-link),
.stu-tl-item:has(> .plan-task-link) { flex-wrap: wrap; }
.plan-task-link-label { color: #1f3cff; font-weight: 700; white-space: nowrap; }
.plan-task-link-title { min-width: 120px; flex: 1 1 240px; overflow-wrap: anywhere; }
.plan-task-link-status { color: #a85a08; font-weight: 700; white-space: nowrap; }
.plan-task-link-status.is-complete { color: #087e53; }
.plan-task-link-ddl { color: #475467; white-space: nowrap; }
.task-list-link-hints:not(:empty) { margin-top: 8px; }
.task-list-link-hints .plan-task-link { margin: 4px 0; flex: none; width: 100%; box-sizing: border-box; }

/* Keep linked Zhishi tasks compact until the user asks to see their details. */
.plan-task-link-disclosure {
  flex: 0 0 calc(100% - 52px);
  min-width: 0;
  margin: 4px 8px 8px 44px;
}
.timeline-month-item:has(> .plan-task-link-disclosure),
.stu-tl-item:has(> .plan-task-link-disclosure) { flex-wrap: wrap; }
.plan-task-link-toggle {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  max-width: 100%;
  padding: 5px 9px;
  border: 1px solid #cbd9ff;
  border-radius: 999px;
  background: #eff4ff;
  color: #1f3cff;
  font-size: 12px;
  font-weight: 700;
  line-height: 1.4;
  cursor: pointer;
  list-style: none;
  user-select: none;
}
.plan-task-link-toggle::-webkit-details-marker { display: none; }
.plan-task-link-toggle::marker { content: ''; }
.plan-task-link-toggle:hover,
.plan-task-link-toggle:focus-visible { background: #e5edff; border-color: #8da7ff; }
.plan-task-link-toggle:focus-visible { outline: 2px solid #1f3cff; outline-offset: 2px; }
.plan-task-link-disclosure.is-student .plan-task-link-toggle {
  border-color: #b8e3df;
  background: #effaf8;
  color: #087b72;
}
.plan-task-link-disclosure.is-student .plan-task-link-toggle:hover,
.plan-task-link-disclosure.is-student .plan-task-link-toggle:focus-visible {
  border-color: #71beb5;
  background: #e3f5f2;
}
.plan-task-link-disclosure.is-student .plan-task-link-toggle:focus-visible { outline-color: #087b72; }
.plan-task-link-disclosure.is-student .plan-task-link-toggle-mark { background: #d5f0eb; }
.plan-task-link-toggle-mark {
  display: inline-grid;
  place-items: center;
  width: 16px;
  height: 16px;
  border-radius: 5px;
  background: #dce7ff;
  font-size: 10px;
}
.plan-task-link-toggle-count { font-variant-numeric: tabular-nums; }
.plan-task-link-toggle-arrow {
  width: 6px;
  height: 6px;
  margin: -3px 2px 0 2px;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg);
  transition: transform .15s ease, margin .15s ease;
}
.plan-task-link-disclosure[open] .plan-task-link-toggle-arrow {
  margin: 3px 2px 0 2px;
  transform: rotate(225deg);
}
.plan-task-link-details { margin-top: 6px; }
.plan-task-link-details .plan-task-link {
  box-sizing: border-box;
  width: 100%;
  margin: 4px 0 0;
}
.task-list-link-hints .plan-task-link-disclosure {
  flex: none;
  width: 100%;
  margin: 4px 0;
}