/* Learning controls are scoped to generated course previews. */
.lc-course nav.steps { margin-bottom: 8px; }
.lc-course nav.steps .hci-ck { display: none !important; }
.lc-course nav.steps button.hci-done:not([aria-selected="true"]) { border-color: var(--line); }
.lc-course nav.steps .hci-t { display: inline; }
.lc-course nav.steps .hci-s { display: none; }
.lc-course [data-knowledge-course][hidden], .lc-toolbar [hidden] { display: none; }
/* 初中「本节导读」与高中 .hci-guide 同样的标题 + 说明排法 */
details.more.lc-guide > summary { display: flex; flex-wrap: wrap; align-items: baseline; gap: 2px 10px; min-height: 40px; font-weight: 400; list-style: none; }
details.more.lc-guide > summary::-webkit-details-marker { display: none; }
details.more.lc-guide > summary::before { content: "▸"; color: var(--a); margin-right: -4px; transition: transform .15s; }
details.more.lc-guide[open] > summary::before { transform: rotate(90deg); }
.lc-guide-t { font-weight: 700; }
.lc-guide-s { color: var(--muted); }
.lc-toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 14px; margin: 0 0 18px; padding: 8px 12px; border: 1px solid var(--line); border-radius: 8px; background: var(--card); }
.lc-stage { margin-right: auto; font-size: 14px; color: var(--muted); }
.lc-progress { font-size: 14px; color: var(--muted); font-variant-numeric: tabular-nums; }
.lc-button, .lc-point-button { font: inherit; color: var(--fg); background: var(--card); border: 1px solid var(--line); border-radius: 6px; min-height: 40px; padding: 7px 12px; cursor: pointer; }
a.lc-button { display: inline-flex; align-items: center; text-decoration: none; }
.lc-button:hover, .lc-point-button:hover, .lc-point-button[aria-expanded="true"] { border-color: var(--a); background: var(--ok-soft); }
.lc-link { display: inline-flex; align-items: center; min-height: 40px; font-size: 14px; text-underline-offset: 3px; }
.lc-question-tools { display: flex; flex-wrap: wrap; gap: 8px 16px; align-items: center; margin-top: 16px; padding-top: 10px; border-top: 1px solid var(--line); }
.lc-question-tools .lc-button { font-size: 14px; }
.lc-note { color: var(--muted); font-size: 14px; line-height: 1.7; }
.lc-toolbar .lc-note { flex-basis: 100%; margin: 0; }
.lc-dialog { box-sizing: border-box; width: min(880px, calc(100vw - 28px)); max-width: calc(100vw - 28px); max-height: calc(100dvh - 32px); padding: 22px; color: var(--fg); background: var(--bg); border: 1px solid var(--line); border-radius: 12px; overflow: auto; overscroll-behavior: contain; }
.lc-dialog::backdrop { background: rgb(0 0 0 / 48%); }
.lc-dialog-heading, .lc-dialog-links { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px 16px; }
.lc-dialog-heading h2 { font-size: 22px; margin: 0; }
.lc-dialog-heading .lc-button { margin-left: auto; }
.lc-points { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 220px), 1fr)); gap: 8px; }
.lc-point-button { text-align: left; overflow-wrap: anywhere; }
.lc-dialog-links { justify-content: flex-start; margin: 10px 0; }
.lc-point-content { min-width: 0; }
.lc-point-content:not(:empty) { margin-top: 18px; border-top: 1px solid var(--line); padding-top: 18px; }
.lc-dialog .katex-display { max-width: 100%; overflow-x: auto; }
.lc-dialog :is(p, li, h2, h3, a, button) { overflow-wrap: anywhere; }
.lc-course :is(.predict, .prob[data-question-id]) { scroll-margin-top: 100px; }
.lc-button:focus-visible, .lc-link:focus-visible, .lc-point-button:focus-visible, .lc-course :is(.predict, .prob[data-question-id]):focus-visible { outline: 3px solid var(--hl); outline-offset: 3px; }
@media (max-width: 600px) {
  .lc-course nav.steps.hci-steps { gap: 3px; }
  .lc-course nav.steps.hci-steps button { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 1px; min-height: 72px; padding: 5px 4px; font-size: 14px; white-space: normal; }
  .lc-course nav.steps.hci-steps .hci-t { display: block; width: 100%; min-height: 2.8em; box-sizing: border-box; padding-inline: 2px; line-height: 1.4; text-wrap: balance; overflow-wrap: anywhere; }
  .lc-course nav.steps.hci-steps .hci-s { display: none; }
  .lc-course nav.steps.hci-steps .hci-n { font-size: 14px; line-height: 1.2; }
  .lc-toolbar { gap: 4px 8px; padding: 6px 8px; }
  .lc-toolbar .lc-stage { font-size: 14px; }
  .lc-toolbar .lc-button, .lc-toolbar .lc-link { font-size: 14px; }
  .lc-dialog { padding: 16px; }
  .lc-dialog-heading h2 { font-size: 19px; }
  .lc-dialog-heading .lc-button { font-size: 14px; }
}

/* 连续学习：最后一步末尾的「下一节」卡片 + 页底上一节 / 下一节 */
.lc-next-lesson { margin: 28px 0 8px; padding: 18px; border: 1px solid var(--line); border-radius: 12px; background: var(--card); }
.lc-nl-eyebrow { margin: 0 0 10px; font-size: 14px; color: var(--muted); }
.lc-nl-eyebrow::before { content: "✓"; display: inline-block; margin-right: 6px; color: var(--a); font-weight: 700; }
.lc-nl-note { margin: 0 0 8px; }
.lc-nl-main { display: grid; gap: 4px; padding: 14px 16px; border: 1px solid var(--a); border-radius: 10px; background: var(--ok-soft); color: var(--fg); text-decoration: none; transition: transform .15s, box-shadow .15s; }
.lc-nl-main:hover { transform: translateY(-1px); box-shadow: 0 4px 14px color-mix(in srgb, var(--a) 22%, transparent); }
.lc-nl-main:focus-visible { outline: 2px solid var(--a); outline-offset: 2px; }
.lc-nl-where { font-size: 14px; color: var(--muted); }
.lc-nl-title { font-size: 19px; line-height: 1.35; }
.lc-nl-go { justify-self: start; margin-top: 6px; padding: 6px 14px; border-radius: 999px; background: var(--a); color: var(--bg); font-size: 14px; font-weight: 600; }
.lc-nl-links { display: flex; flex-wrap: wrap; gap: 4px 18px; margin-top: 8px; }
nav.back.lc-pager { display: grid; margin: 32px 0 8px; grid-template-columns: 1fr auto 1fr; align-items: stretch; gap: 10px; text-align: left; }
.lc-pager > a { display: flex; flex-direction: column; justify-content: center; gap: 2px; min-height: 48px; padding: 8px 14px; border: 1px solid var(--line); border-radius: 10px; background: var(--card); color: var(--fg); text-decoration: none; min-width: 0; }
.lc-pager > a:hover { border-color: var(--a); }
.lc-pager > a.is-empty { visibility: hidden; }
.lc-pager > a.lc-pager-all { align-items: center; font-size: 15px; padding: 8px 16px; }
.lc-pager-next { text-align: right; align-items: flex-end; }
.lc-pager-k { font-size: 14px; color: var(--muted); }
.lc-pager-t { font-size: 15px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 100%; }
@media (max-width: 600px) {
  nav.back.lc-pager { grid-template-columns: 1fr 1fr; }
  .lc-pager > a.lc-pager-all { grid-column: 1 / -1; grid-row: 2; }
  .lc-pager > a.is-empty { display: none; }
  .lc-pager > a.is-empty + .lc-pager-all + .lc-pager-next, .lc-pager-prev:has(+ .lc-pager-all + .is-empty) { grid-column: 1 / -1; }
  .lc-nl-title { font-size: 17px; }
}
@media (prefers-reduced-motion: reduce) { .lc-nl-main { transition: none; } .lc-nl-main:hover { transform: none; } }