/* 课件馆入口专用：保留课程页和首页的卡片布局。 */
.course-library [hidden] { display: none !important; }
.course-library .library-hero { padding-block: 48px 32px; }
.course-library .library-hero h1 { font-size: clamp(2rem, 4vw, 3.5rem); margin: 12px 0; }
.course-library .library-tagline { margin: 0; font-size: clamp(1.05rem, 1.6vw, 1.25rem); }
.course-library .library-hero .section-intro { margin: 8px 0 0; font-size: .92rem; }
.course-library .library-layout { display: grid; grid-template-columns: 210px minmax(0, 1fr); gap: 40px; align-items: start; }
.course-library .library-directory { position: sticky; top: 108px; padding: 18px 0; border-top: 2px solid var(--teal); }
.course-library .library-directory-title { margin: 0 12px 16px; font-size: .8rem; font-weight: 700; color: var(--muted); letter-spacing: .08em; }
.course-library .library-categories { display: grid; gap: 6px; }
.course-library .library-category { display: flex; align-items: center; justify-content: space-between; gap: 16px; width: 100%; padding: 12px; border: 1px solid transparent; border-radius: 10px; background: transparent; color: var(--muted); font: inherit; font-size: .92rem; cursor: pointer; text-align: left; }
.course-library .library-category:hover { background: var(--surface); color: var(--teal); }
.course-library .library-category[aria-pressed="true"] { background: var(--teal-soft); color: var(--teal-deep); border-color: color-mix(in srgb, var(--teal) 30%, transparent); font-weight: 700; }
.course-library .library-category-count { font: .75rem monospace; min-width: 24px; text-align: center; padding: 3px 6px; border-radius: 6px; background: color-mix(in srgb, var(--surface) 65%, transparent); }
.course-library .library-directory-note { margin: 24px 12px 0; padding-top: 20px; border-top: 1px solid var(--line); color: var(--muted); font-size: .78rem; line-height: 1.9; }
.course-library .library-results { min-width: 0; }
.course-library .library-search-bar { display: flex; align-items: center; gap: 16px; margin-bottom: 24px; }
.course-library .library-search-field { display: flex; align-items: center; gap: 12px; flex: 1; min-width: 0; padding: 13px 16px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); color: var(--teal); }
.course-library .library-search-field:focus-within { outline: 2px solid var(--teal); outline-offset: 3px; }
.course-library .library-search-field svg { flex-shrink: 0; }
.course-library .library-search-field input { width: 100%; min-width: 0; border: 0; outline: 0; background: transparent; color: var(--ink); font: inherit; font-size: .95rem; }
.course-library .library-search-field input::placeholder { color: var(--muted); }
.course-library .library-clear { border: 0; background: transparent; color: var(--teal); font: inherit; font-size: .82rem; cursor: pointer; white-space: nowrap; padding: 10px 0; }
.course-library .library-list-heading { margin-bottom: 14px; gap: 16px; }
.course-library .library-list-heading h2 { font-size: 1.05rem; }
.course-library .library-list-heading > span { font-family: inherit; font-size: .8rem; }
.course-library .session-cards { grid-template-columns: minmax(0, 1fr); gap: 12px; }
.course-library .session-card { flex-direction: row; align-items: center; gap: 20px; padding: 14px; border-radius: 15px; box-shadow: 0 3px 12px color-mix(in srgb, var(--ink) 4%, transparent); }
.course-library .session-card:hover { transform: translateY(-2px); border-color: color-mix(in srgb, var(--teal) 45%, var(--line)); box-shadow: 0 7px 18px color-mix(in srgb, var(--ink) 8%, transparent); }
.course-library .session-cover { flex: 0 0 154px; width: 154px; border-radius: 9px; }
.course-library .session-copy { padding: 0; gap: 5px; min-width: 0; }
.course-library .session-copy h3 { font-size: clamp(1rem, 1.5vw, 1.24rem); line-height: 1.45; }
.course-library .session-copy p { font-size: .84rem; line-height: 1.6; }
.course-library .session-copy .session-label { font-size: .68rem; letter-spacing: .02em; }
.course-library .session-link { padding-top: 3px; margin-top: 0; font-size: .78rem; }
.course-library .session-cover strong { font-size: 20px; line-height: 1.2; }
.course-library .session-cover strong span { font-size: 15px; }
.course-library .session-cover > span { font-size: 5px; }
.course-library .session-cover small { font-size: 5px; }
.course-library .codex-cover, .course-library .human-model-cover, .course-library .willpower-cover { padding: 12px; }
.course-library .library-empty { text-align: center; padding: 48px 16px; border: 1px dashed var(--line); border-radius: 15px; color: var(--muted); }
.course-library .library-empty p { color: var(--ink); font-size: 1rem; margin-bottom: 8px; }
.course-library .library-empty span { font-size: .85rem; }
.course-library .library-more { display: block; margin: 24px auto 0; padding: 12px 24px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); color: var(--teal); font: inherit; cursor: pointer; }
.course-library .library-category:focus-visible, .course-library .library-clear:focus-visible, .course-library .library-more:focus-visible { outline: 3px solid var(--teal); outline-offset: 3px; }
.course-library .visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
@media (max-width: 960px) {
  .course-library .library-layout { grid-template-columns: minmax(0, 1fr); gap: 18px; }
  .course-library .library-directory { position: static; padding: 0; border: 0; min-width: 0; }
  .course-library .library-directory-title, .course-library .library-directory-note { display: none; }
  .course-library .library-categories { display: flex; overflow-x: auto; padding: 4px 3px 10px; gap: 8px; }
  .course-library .library-category { width: auto; flex-shrink: 0; padding: 10px 12px; border-color: var(--line); background: var(--surface); gap: 8px; }
  .course-library .library-search-bar { margin-bottom: 18px; }
  /* 手机上搜索先出现，分类紧随其后；分类仍保留在语义目录中。 */
  .course-library .library-layout { display: flex; flex-direction: column; }
  .course-library .library-results { display: contents; }
  .course-library .library-directory { width: 100%; order: -1; }
  .course-library .library-search-bar { width: 100%; order: -2; margin: 0; }
  .course-library .library-list-heading, .course-library .session-cards, .course-library .library-empty { width: 100%; }
  .course-library .library-list-heading { margin: 0; }
}
@media (max-width: 600px) {
  .course-library .library-hero { padding-block: 28px 24px; }
  .course-library .library-sessions { padding-bottom: 48px; }
  .course-library .library-search-bar { flex-wrap: wrap; gap: 4px 12px; }
  .course-library .library-search-field { flex-basis: 100%; }
  .course-library .library-clear { margin-left: auto; }
  .course-library .session-card { gap: 12px; padding: 12px; align-items: flex-start; }
  .course-library .session-cover { flex-basis: 90px; width: 90px; margin-top: 3px; }
  .course-library .session-copy h3 { font-size: 1rem; }
  .course-library .session-copy p { font-size: .78rem; }
  .course-library .session-copy .session-label { font-size: .62rem; }
  .course-library .session-cover strong { font-size: 12px; }
  .course-library .session-cover strong span { font-size: 10px; }
  .course-library .session-cover > span, .course-library .session-cover small { display: none; }
  .course-library .codex-cover, .course-library .human-model-cover, .course-library .willpower-cover { padding: 7px; justify-content: center; }
}
@media (prefers-reduced-motion: reduce) {
  .course-library .session-card:hover { transform: none; }
}