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var(--line)}.bk-instructor:first-of-type{border-top:0}.bk-avatar{width:52px;height:52px;border-radius:50%;flex-shrink:0;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800;font-size:var(--fs-xl)}.bk-review{border-top:1px solid var(--line);padding:10px 0;font-size:var(--fs-base)}.bk-review:first-of-type{border-top:0}.bk-stars{color:var(--gold-600);letter-spacing:1px}.bk-footer{background:var(--primary);color:#fff;margin-top:var(--sp-9)}.bk-footer-in{max-width:1120px;margin:0 auto;padding:28px 24px;display:grid;grid-gap:10px;gap:10px;text-align:center}.bk-footer nav{display:flex;gap:6px;justify-content:center;flex-wrap:wrap;font-size:var(--fs-base)}.bk-footer a{color:rgb(255 255 255/.85)}.bk-footer small{color:rgb(255 255 255/.65)}.bk-empty{text-align:center;padding:48px 16px;color:var(--muted)}.bk-count{margin:var(--sp-1) 0 14px;color:var(--muted);font-size:var(--fs-base)}.bk-title-row{display:flex;align-items:flex-start;gap:var(--sp-3);flex-wrap:wrap}.bk-title-row h1{margin:0;flex:1 1;min-width:220px}@media (max-width:860px){.bk-detail-grid,.bk-results-layout{grid-template-columns:1fr}.bk-filters,.bk-sticky{position:static}.bk-card{grid-template-columns:1fr}.bk-thumb{min-height:130px;font-size:48px}.bk-side{-webkit-border-start:0;border-inline-start:0;border-top:1px solid var(--line);align-items:flex-start;text-align:start}.bk-cover{height:200px}.bk-search{flex-direction:column}.bk-nav-in{gap:10px}}.mh{background:var(--bg);color:var(--ink)}.mh-top{background:var(--surface);border-bottom:1px solid var(--line);position:-webkit-sticky;position:sticky;top:0;z-index:var(--z-top)}.mh-top-in{max-width:1180px;margin:0 auto;padding:10px 24px;gap:16px;flex-wrap:wrap}.mh-logo,.mh-top-in{display:flex;align-items:center}.mh-logo{gap:10px;color:inherit}.mh-logo:hover{text-decoration:none}.mh-mark{width:36px;height:36px;border-radius:10px;background:var(--primary);color:#fff;display:inline-flex;align-items:center;justify-content:center;font-weight:800;font-size:20px;flex-shrink:0}.mh-logo-t{display:grid;line-height:1.25}.mh-logo-t strong{font-size:var(--fs-lg)}.mh-logo-t small{font-size:var(--fs-xs);color:var(--muted)}.mh-nav{display:flex;gap:16px;align-items:center;flex:1 1;min-width:200px}.mh-nav a{color:var(--ink-2);font-weight:600;font-size:var(--fs-base);padding:6px 2px;border-bottom:2px solid transparent}.mh-nav a:hover{color:var(--primary);text-decoration:none}.mh-nav a.on{color:var(--primary);border-bottom-color:var(--primary)}.mh-search{display:flex;align-items:center;background:var(--surface-2);border:1px solid var(--line);border-radius:var(--radius-pill);padding:4px 6px 4px 12px;min-width:200px;flex:0 1 260px}[dir=ltr] .mh-search{padding:4px 12px 4px 6px}.mh-search input{flex:1 1;min-width:0;border:0;background:transparent;color:var(--ink);font:inherit;font-size:var(--fs-sm);outline:none}.mh-search button{width:30px;height:30px;border-radius:50%;border:0;background:var(--primary);color:#fff;display:inline-flex;align-items:center;justify-content:center;cursor:pointer}.mh-search button svg{width:16px;height:16px}.mh-search button:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.mh-auth{display:flex;gap:8px;align-items:center}.mh-lang{font-size:var(--fs-sm);font-weight:600;color:var(--muted);border:1px solid var(--line);border-radius:var(--radius-sm);padding:6px 10px}.mh-btn-ghost{border:1px solid var(--line-strong);color:var(--ink);border-radius:var(--radius-sm);padding:8px 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var(--line);box-shadow:var(--shadow-xl);animation:sheet-in var(--dur-slow) var(--ease-out)}.sheet-head{display:flex;align-items:center;gap:var(--sp-3);padding:var(--sp-4) var(--sp-5);border-bottom:1px solid var(--line)}.sheet-head h2{margin:0;flex:1 1;font-size:var(--fs-lg)}.sheet-body{flex:1 1;overflow-y:auto;padding:var(--sp-5)}.sheet-foot{display:flex;gap:var(--sp-2);justify-content:flex-end;padding:var(--sp-4) var(--sp-5);border-top:1px solid var(--line)}@keyframes sheet-in{0%{transform:translateX(-24px);opacity:0}}@keyframes fade-in{0%{opacity:0}}[dir=ltr] .sheet{animation-name:sheet-in-ltr}@keyframes sheet-in-ltr{0%{transform:translateX(24px);opacity:0}}.kv{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));grid-gap:var(--sp-3);gap:var(--sp-3)}.kv-item{background:var(--surface-2);border-radius:var(--radius-sm);padding:10px 12px;font-size:var(--fs-sm);color:var(--muted)}.kv-item 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svg{flex-shrink:0;transition:transform var(--dur) var(--ease)}.nav-group-toggle[aria-expanded=false] svg{transform:rotate(90deg)}[dir=ltr] .nav-group-toggle[aria-expanded=false] svg{transform:rotate(-90deg)}.nav-group>div{display:grid;grid-gap:2px;gap:2px}.side-search{display:flex;align-items:center;gap:var(--sp-2);margin:var(--sp-3) var(--sp-3) 0;padding:0 var(--sp-3);height:38px;flex-shrink:0;border:1px solid var(--side-line);border-radius:var(--radius-sm);background:rgb(255 255 255/.05);color:var(--side-ink);font:inherit;font-size:var(--fs-sm);cursor:pointer;transition:border-color var(--dur-fast) var(--ease),background var(--dur-fast) var(--ease)}.side-search:hover{background:var(--side-hover);color:#fff;border-color:var(--brand-500)}.side-search-text{flex:1 1;min-width:0;text-align:start;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.side-search kbd{font-family:inherit;font-size:11px;line-height:1;padding:3px 6px;border:1px solid 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var(--ease)}.side-collapse:hover{background:var(--side-hover);color:#fff}.shell.side-collapsed .side{width:var(--side-w-collapsed)}.shell.side-collapsed .brand-text,.shell.side-collapsed .nav-group-label,.shell.side-collapsed .nav-group-toggle,.shell.side-collapsed .nav-label,.shell.side-collapsed .side-collapse-text,.shell.side-collapsed .side-filter,.shell.side-collapsed .side-role,.shell.side-collapsed .side-search kbd,.shell.side-collapsed .side-search-text{display:none}.shell.side-collapsed .side-head{justify-content:center;padding-inline:var(--sp-2)}.shell.side-collapsed .side-head .brand{justify-content:center;flex:0 0 auto}.shell.side-collapsed .side-search{justify-content:center;padding:0}.shell.side-collapsed .side-nav{padding-inline:var(--sp-2)}.shell.side-collapsed .nav-group+.nav-group{margin-top:var(--sp-2);padding-top:var(--sp-2);border-top:1px solid var(--side-line)}.shell.side-collapsed .nav-item{justify-content:center;padding:10px 0}.shell.side-collapsed .nav-item.active:before{top:8px;bottom:8px}.shell.side-collapsed .nav-badge{position:absolute;top:1px;inset-inline-end:1px;min-width:16px;height:16px;padding:0 4px;margin:0;font-size:10px}.shell.side-collapsed .side-foot{justify-items:center}.shell.side-collapsed .side-collapse{width:44px;padding-inline:0}@media (max-width:900px){.shell.side-collapsed .side{width:min(300px,86vw)}.shell.side-collapsed .brand-text{display:grid}.shell.side-collapsed .nav-label,.shell.side-collapsed .side-search kbd,.shell.side-collapsed .side-search-text{display:block}.shell.side-collapsed .nav-group-toggle{display:flex}.shell.side-collapsed .nav-group-label{display:block}.shell.side-collapsed .side-filter{display:flex}.shell.side-collapsed .side-role{display:block}.shell.side-collapsed .side-head{justify-content:flex-start}.shell.side-collapsed .side-head .brand{justify-content:flex-start;flex:1 1}.shell.side-collapsed .side-search{justify-content:flex-start;padding:0 var(--sp-3)}.shell.side-collapsed .side-nav{padding:var(--sp-2) var(--sp-3) var(--sp-4)}.shell.side-collapsed .nav-group+.nav-group{margin-top:var(--sp-4);padding-top:0;border-top:0}.shell.side-collapsed .nav-item{justify-content:flex-start;padding:9px var(--sp-3) 9px 14px}.shell.side-collapsed .nav-badge{position:static;min-width:20px;height:20px;font-size:var(--fs-xs)}.shell.side-collapsed .side-foot{justify-items:stretch}.side-collapse{display:none}}.attention-list{display:grid;grid-gap:var(--sp-2);gap:var(--sp-2)}.attention-item{display:flex;align-items:center;gap:var(--sp-3);padding:12px 14px;border-radius:var(--radius-sm);border:1px solid var(--line);background:var(--surface);color:inherit;text-decoration:none;transition:border-color var(--dur-fast) var(--ease),background var(--dur-fast) var(--ease)}a.attention-item:hover{border-color:var(--primary);background:var(--brand-50);text-decoration:none}[data-theme=dark] a.attention-item:hover{background:var(--surface-2)}.attention-item 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var(--ease)}.course-card:hover{box-shadow:var(--shadow)}.course-card-top{display:flex;align-items:flex-start;gap:var(--sp-3)}.course-cover{width:48px;height:48px;flex-shrink:0;display:grid;place-items:center;border-radius:var(--radius-sm);background:var(--brand-100);color:var(--brand-on-soft);font-size:var(--fs-xl);font-weight:800;line-height:1}.course-card-top h3{flex:1 1;min-width:0;font-size:var(--fs-md);font-weight:700;text-overflow:ellipsis}.course-card-top 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