/* 课件、教案、图片生成共用的教材路径与输入框工具 */
.course-context-picker {
  position: relative;
  min-width: 0;
  min-height: 28px;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: #4a7cfd;
  vertical-align: middle;
}

.course-context-crumb {
  max-width: 210px;
  padding: 4px 10px;
  border: 1px solid transparent;
  border-radius: 12px;
  background: #F0F3FF;
  color: #4a7cfd;
  font: inherit;
  font-size: 13px;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}
.course-context-crumb i { font-size: 9px; opacity: .55; }
.course-context-crumb.placeholder { color: #a3a8b5; background: #f5f6fb; }

.course-context-crumb:hover,
.course-context-crumb.active {
  background: #fff;
  border-color: #4a7cfd;
  box-shadow: 0 2px 8px rgba(79,109,246,.15);
}

.course-context-separator { flex: 0 0 auto; width: 1px; height: 14px; margin: 0 2px; background: #e5e7ed; }
.course-context-menu {
  display: none; position: absolute; z-index: 80; left: 0; bottom: calc(100% + 9px);
  width: min(560px, calc(100vw - 90px)); max-height: 300px; overflow-y: auto;
  padding: 9px; border: 1px solid #e1e5ef; border-radius: 11px; background: #fff;
  box-shadow: 0 14px 38px rgba(38,49,92,.17); grid-template-columns: repeat(3,minmax(0,1fr)); gap: 6px;
}
.course-context-picker[data-placement="bottom"] .course-context-menu { top: calc(100% + 9px); bottom: auto; }
.course-context-menu.show { display: grid; }
.course-context-menu[data-menu="textbook"] { width: 320px; grid-template-columns: repeat(2,minmax(0,1fr)); }
.course-context-menu[data-menu="grade"] { width: 420px; display: none; grid-template-columns: 1fr; }
.course-context-menu[data-menu="grade"].show { display: grid; }
.course-context-menu[data-menu="chapter"] {
  width: min(420px,calc(100vw - 32px));
  max-height: min(520px,calc(100vh - 150px));
  padding: 0;
  overflow: hidden;
  display: none;
  grid-template-columns: 1fr;
  align-items: start;
}
.course-context-menu[data-menu="chapter"].show { display: block; }
.course-context-option { min-height: 36px; padding: 7px 10px; border: 0; border-radius: 7px; background: transparent; color: #535a6b; font: inherit; font-size: 12px; text-align: left; cursor: pointer; }
.course-context-option:hover,.course-context-option.selected { background: #eef1ff; color: #4a7cfd; }
.course-context-grade-row { min-height: 42px; padding: 5px 8px 5px 12px; display:flex; align-items:center; justify-content:space-between; border-radius:8px; color:#454b5b; font-size:13px; }
.course-context-grade-row:hover { background:#fafbff; }
.course-context-term-group { display:flex; gap:7px; }
.course-context-term { min-width:72px; height:30px; border:1px solid #e1e5ef; border-radius:8px; background:#fff; color:#62697a; cursor:pointer; }
.course-context-term:hover,.course-context-term.selected { border-color:#4a7cfd; color:#4a7cfd; background:#eef1ff; }
.course-context-unit { min-width:0; }
.course-context-unit h4 { margin:2px 4px 5px; padding:6px 7px; border-radius:7px; background:#f6f7fb; color:#33394a; font-size:12px; }
.course-context-unit .course-context-option { width:100%; display:block; }
.course-context-empty-tip { grid-column:1/-1; margin:0; padding:22px; text-align:center; color:#a3a8b5; font-size:13px; }

.course-context-search-wrap {
  position: sticky;
  top: 0;
  z-index: 2;
  padding: 12px 12px 10px;
  border-bottom: 1px solid #edf0f6;
  background: #fff;
}
.course-context-search {
  height: 40px;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 0 11px;
  border: 1px solid #dfe4ee;
  border-radius: 8px;
  background: #fff;
  transition: border-color .18s,box-shadow .18s;
}
.course-context-search:focus-within {
  border-color: #4a7cfd;
  box-shadow: 0 0 0 3px rgba(74,124,253,.11);
}
.course-context-search>i { color: #8d95a7; font-size: 13px; }
.course-context-search input {
  width: 100%;
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: #30384a;
  font: inherit;
  font-size: 13px;
}
.course-context-search input::placeholder { color: #697186; opacity: 1; }
.course-context-search button {
  width: 24px;
  height: 24px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: #f1f3f8;
  color: #9299aa;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
}
.course-context-search button.show { opacity: 1; pointer-events: auto; }
.course-context-search-count {
  display: block;
  margin-top: 7px;
  color: #a0a6b4;
  font-size: 11px;
  line-height: 1;
}
.course-context-tree {
  max-height: min(410px,calc(100vh - 250px));
  padding: 8px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: #cbd1de transparent;
}
.course-context-tree::-webkit-scrollbar { width: 5px; }
.course-context-tree::-webkit-scrollbar-thumb { border-radius: 5px; background: #cbd1de; }
.course-context-tree-group { margin-bottom: 3px; }
.course-context-tree-unit,
.course-context-tree-lesson {
  width: 100%;
  border: 0;
  font: inherit;
  text-align: left;
  cursor: pointer;
}
.course-context-tree-unit {
  min-height: 40px;
  padding: 7px 10px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  gap: 9px;
  background: #f7f8fb;
  color: #313748;
  font-size: 13px;
  font-weight: 600;
}
.course-context-tree-unit:hover { background: #f0f3ff; color: #4a7cfd; }
.course-context-tree-unit>i { width: 10px; font-size: 10px; color: #8f96a7; transition: transform .18s; }
.course-context-tree-group.open .course-context-tree-unit>i { transform: rotate(90deg); }
.course-context-tree-unit span { flex: 1; }
.course-context-tree-unit em {
  min-width: 24px;
  height: 20px;
  padding: 0 6px;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: #eceff5;
  color: #8990a0;
  font-size: 11px;
  font-style: normal;
  font-weight: 500;
}
.course-context-tree-lessons { display: none; padding: 4px 0 7px 26px; }
.course-context-tree-group.open .course-context-tree-lessons { display: block; }
.course-context-tree-lesson {
  min-height: 34px;
  padding: 6px 9px;
  border-radius: 7px;
  display: flex;
  align-items: center;
  gap: 8px;
  background: transparent;
  color: #555d70;
  font-size: 12px;
}
.course-context-tree-lesson span { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.course-context-tree-lesson>i { display: none; color: #4a7cfd; font-size: 11px; }
.course-context-tree-lesson:hover { background: #f6f8ff; color: #4a7cfd; }
.course-context-tree-lesson.selected { background: #edf2ff; color: #4a7cfd; font-weight: 600; }
.course-context-tree-lesson.selected>i { display: inline-block; }
.course-context-tree-empty {
  display: none;
  min-height: 150px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  color: #a1a8b6;
  font-size: 13px;
}
.course-context-tree-empty.show { display: flex; }
.course-context-tree-empty i { font-size: 26px; color: #c9cfda; }

.course-context-clear,.chain-clear-btn {
  margin-left: auto; height: 28px; padding: 0 11px; border: 1px solid #e3e7f1; border-radius: 9px;
  background: #fff; color: #8d93a2; font: inherit; font-size: 12px; cursor: pointer;
}
.course-context-clear:hover,.chain-clear-btn:hover { border-color: #B5C1FC; color: #4a7cfd; background: #f7f8ff; }

@media (max-width:760px) {
  .course-context-picker { flex-wrap: wrap; }
  .course-context-crumb { max-width: 145px; }
  .course-context-menu { grid-template-columns: repeat(2,minmax(0,1fr)); }
  .course-context-menu[data-menu="chapter"] { width: min(390px,calc(100vw - 24px)); }
}