.bk-main{max-width:1280px;padding-top:28px!important;padding-bottom:60px!important}.bk-header{max-width:1280px;min-height:70px!important}.bk-header nav{display:flex;gap:24px;font-size:14px}.bk-intro{display:flex;justify-content:space-between;align-items:center;gap:20px;margin-bottom:26px}.bk-intro h1{margin:0;font-size:28px}.bk-kicker{color:var(--brand);font-size:12px;font-weight:650;margin:0 0 5px}.bk-selectors{display:grid;grid-template-columns:160px 220px minmax(0,1fr);gap:18px;padding:20px 24px;background:white;border:1px solid var(--line);border-radius:8px;margin-bottom:28px}.bk-selectors label{display:grid;gap:6px;font-size:12px;color:var(--muted);min-width:0}select{font:inherit;background:white;color:#222e35;border:1px solid #c5d1d2;border-radius:5px;padding:9px 10px;min-height:44px;max-width:100%;min-width:0}.bk-selectors select{width:100%;font-size:14px}.bk-workspace{display:grid;grid-template-columns:276px minmax(0,1fr);gap:30px;align-items:start}.bk-sidebar{border:1px solid var(--line);border-radius:8px;background:white;padding:20px 14px 14px;position:sticky;top:18px;max-height:calc(100dvh - 36px);display:flex;flex-direction:column;min-height:0;min-width:0}.bk-sidebar-head{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:0 6px}.bk-sidebar h2{font-size:17px}.bk-sidebar>p{margin:6px 6px 14px}.bk-directory-search{display:block;margin:0 4px 16px}.bk-directory-search input{width:100%;min-height:44px;min-width:0;padding:10px 12px;border:1px solid #c5d1d2;border-radius:5px;background:#f8faf9;font-size:14px}.bk-directory{overflow:auto;overscroll-behavior:contain;scrollbar-width:thin;min-height:0}.bk-unit{border-bottom:1px solid #edf1f1;padding-bottom:5px;margin-bottom:5px}.bk-unit:last-child{border:0}.bk-unit summary{font-size:13px;font-weight:650;padding:12px 8px;cursor:pointer;color:#45565c}.bk-lesson{display:flex;justify-content:space-between;gap:14px;align-items:baseline;padding:11px 12px;margin:2px 0;border-radius:5px;font-size:14px;line-height:1.5;overflow-wrap:anywhere;min-height:44px}.bk-lesson span:first-child{min-width:0}.bk-lesson .bk-number{color:#82908f;font-size:12px;flex:none;font-variant-numeric:tabular-nums}.bk-lesson[aria-current=true]{background:#e5f2ed;color:var(--brand);font-weight:650;box-shadow:inset 3px 0 var(--brand)}.bk-lesson:hover{background:#f0f6f3}.bk-content{min-width:0}.bk-lesson-bar{display:flex;align-items:center;gap:14px;background:#f4f7f7;padding:0 0 20px}.bk-lesson-heading{min-width:0;flex:1}.bk-lesson-heading h2{font-size:25px;line-height:1.5;overflow-wrap:anywhere;margin:0}.bk-lesson-heading .muted{margin:5px 0 0}.bk-lesson-nav{display:flex;gap:6px;flex:none}.bk-icon{display:inline-flex;align-items:center;justify-content:center;min-width:44px;min-height:44px;padding:4px 10px;border:1px solid var(--line);border-radius:5px;background:white;color:#45565c;font-size:24px;line-height:1}.bk-icon:disabled,.bk-pagination button:disabled{opacity:.4;cursor:default}.bk-resource-tools{border-bottom:1px solid var(--line)}.bk-types{display:flex;gap:6px;border-bottom:1px solid var(--line);overflow-x:auto;scrollbar-width:thin}.bk-type{border:0;border-bottom:3px solid transparent;background:transparent;color:#56656b;min-height:50px;padding:10px 14px;font-size:15px;white-space:nowrap}.bk-type span{font-size:12px;margin-left:6px;color:#7a8a8b;font-variant-numeric:tabular-nums}.bk-type[aria-pressed=true]{border-bottom-color:var(--brand);color:var(--brand);font-weight:650}.bk-type[aria-pressed=true] span{color:var(--brand)}.bk-result-toolbar{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:13px 0;font-size:13px}.bk-result-toolbar label{color:var(--muted);display:flex;align-items:center;gap:8px;flex:none}.bk-result-toolbar select{padding:5px 10px;min-height:40px;font-size:13px}.bk-resource{display:grid;grid-template-columns:44px minmax(0,1fr) auto;gap:16px;padding:23px 0;border-bottom:1px solid var(--line);align-items:start}.bk-file{display:grid;place-items:center;width:44px;height:52px;border-radius:6px;background:#e5f2ed;color:var(--brand);font-size:12px;font-weight:750;letter-spacing:.5px}.bk-file[data-type="2"]{background:#fff0e5;color:#a46024}.bk-file[data-type="3"]{background:#eaf0fb;color:#416c9b}.bk-resource h3{font-size:18px;line-height:1.6;font-weight:600;overflow-wrap:anywhere;margin:0 0 8px}.bk-resource h3 a{display:block}.bk-meta{display:flex;flex-wrap:wrap;gap:4px 14px;font-size:12px;color:var(--muted);overflow-wrap:anywhere}.bk-resource-actions{display:grid;text-align:right;gap:9px;padding-top:3px;white-space:nowrap;font-size:13px}.bk-price{color:var(--brand)}.bk-detail{color:#596b70;min-height:32px;display:inline-flex;align-items:center;justify-content:flex-end}.bk-detail:hover{color:var(--brand)}.bk-feedback{font-size:14px;color:var(--muted);padding:14px 0}.bk-feedback:empty{display:none}.bk-empty{background:white;padding:30px 24px;border:1px dashed #c5d1d2;border-radius:6px;margin:24px 0;color:#596b70;font-size:14px}.bk-empty h3{color:#253b40;font-size:18px;margin:0 0 8px}.bk-empty .actions{gap:10px}.bk-empty .secondary{font-size:13px;padding:8px 14px}.bk-items[aria-busy=true]{opacity:.45}.bk-pagination{display:flex;align-items:center;justify-content:center;gap:14px;margin-top:28px;font-size:13px}.bk-pagination .secondary{font-size:13px;padding:8px 14px}.bk-pagination form{display:flex;align-items:center;gap:6px;min-width:0}.bk-pagination input{min-width:0;width:60px;min-height:44px;padding:8px 4px;border:1px solid #c5d1d2;border-radius:5px;text-align:center}.bk-pagination form span{white-space:nowrap}.bk-pagination .bk-icon{min-width:34px;padding:4px;font-size:20px}.bk-footer{max-width:1280px;display:flex;gap:24px;flex-wrap:wrap}.bk-welcome-heading{margin:36px 0 22px}.bk-welcome-heading h2{font-size:22px}.bk-books{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.bk-book-card{display:block;background:white;border:1px solid var(--line);border-radius:7px;padding:22px;min-width:0;transition:border-color .15s}.bk-book-card:hover{border-color:var(--brand)}.bk-book-card h3{font-size:17px;margin:0 0 12px;overflow-wrap:anywhere}.bk-book-card p{font-size:12px;color:var(--muted);margin:0}.bk-book-card strong{display:block;margin-top:16px;font-size:13px;color:var(--brand);font-weight:500}.bk-directory-dialog{padding:0;width:min(420px,calc(100% - 24px));max-height:calc(100dvh - 28px);border:0;border-radius:10px;color:#222e35;background:white;overflow:hidden}.bk-directory-dialog::backdrop{background:#152d38a6}.bk-directory-dialog .bk-sidebar{position:static;border:0;border-radius:0;max-height:calc(100dvh - 30px);padding:18px 14px}.bk-directory-dialog #bk-close{display:inline-flex}.bk-sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip-path:inset(50%)}#bk-open,#bk-close{display:none}select:focus-visible,summary:focus-visible{outline:3px solid #be734b;outline-offset:3px}
@media(max-width:900px){.bk-selectors{grid-template-columns:120px 160px minmax(0,1fr);padding:18px;gap:12px}.bk-workspace{grid-template-columns:230px minmax(0,1fr);gap:22px}.bk-sidebar{padding:16px 10px}.bk-type{padding:10px}.bk-resource{grid-template-columns:minmax(0,1fr) auto;gap:12px}.bk-file{display:none}.bk-books{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:700px){.bk-header{min-height:64px!important}.bk-header .brand{font-size:20px}.bk-header nav{gap:14px;font-size:13px}.bk-main{padding-top:22px!important;padding-bottom:38px!important}.bk-intro{margin-bottom:20px;gap:12px}.bk-intro h1{font-size:25px}.bk-intro .secondary{font-size:12px;padding:6px 10px;min-height:40px}.bk-selectors{grid-template-columns:1fr 1fr;gap:12px;padding:16px;margin-bottom:24px}.bk-book-field{grid-column:1/-1}.bk-workspace{display:block}.bk-workspace>.bk-sidebar{display:none}.bk-lesson-bar{position:sticky;top:0;z-index:2;padding:12px 0;gap:10px;border-bottom:1px solid var(--line)}#bk-open{display:inline-flex;padding:6px 10px;font-size:13px;flex:none;min-height:42px}.bk-lesson-heading h2{font-size:20px}.bk-lesson-heading .bk-kicker{font-size:11px}.bk-lesson-heading .muted{display:none}.bk-lesson-nav{gap:3px}.bk-lesson-nav .bk-icon{min-width:32px;padding:4px 6px;min-height:42px;font-size:23px}.bk-types{gap:0}.bk-type{font-size:14px;min-height:48px;padding:10px}.bk-type span{margin-left:4px;font-size:11px}.bk-resource{padding:20px 0;grid-template-columns:minmax(0,1fr);gap:9px}.bk-resource h3{font-size:17px;margin-bottom:8px;line-height:1.65}.bk-resource-actions{display:flex;align-items:center;justify-content:space-between;padding:0;gap:16px}.bk-detail{min-height:36px}.bk-meta{gap:4px 10px}.bk-result-toolbar{padding:10px 0}.bk-empty{padding:24px 18px}.bk-books{grid-template-columns:1fr;gap:12px}.bk-book-card{padding:20px}.bk-book-card strong{margin-top:12px}.bk-welcome-heading h2{font-size:20px}.bk-pagination{gap:8px;font-size:12px}.bk-pagination .secondary{font-size:12px;padding:8px 10px;min-height:44px}.bk-pagination input{width:46px}.bk-pagination .bk-icon{min-width:28px}.bk-footer{font-size:12px;gap:16px}.footer{padding-bottom:28px}.bk-result-toolbar #bk-count{font-size:12px}}
@media(max-width:700px){.bk-resource-tools{position:sticky;top:var(--bk-lesson-height,82px);z-index:2;background:#f4f7f7}.bk-lesson-heading{scroll-margin-top:18px}.bk-lesson-heading .bk-kicker{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}}
.bk-selectors{grid-template-columns:minmax(0,520px)}.bk-book-field{grid-column:auto}.bk-books{display:block}.bk-book-group{margin-bottom:32px}.bk-book-group>h3{font-size:18px;margin:0 0 16px}.bk-book-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.bk-book-card h4{font-size:17px;margin:0 0 12px;overflow-wrap:anywhere}@media(max-width:900px){.bk-book-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:700px){.bk-selectors{grid-template-columns:minmax(0,1fr)}.bk-book-grid{grid-template-columns:minmax(0,1fr);gap:12px}}

@media(max-width:700px){.bk-mobile-site .footer{padding-bottom:90px}.bk-mobile-site .bk-directory-dialog{z-index:30}}

[aria-disabled="true"]{opacity:.4;cursor:default;pointer-events:none}.catalog-pagination>a.secondary{display:inline-flex;align-items:center;justify-content:center}.bk-type{display:inline-flex;align-items:center}.crawl-categories{display:flex;flex-wrap:wrap;gap:8px 18px;margin:0 0 22px;color:var(--brand);font-size:14px}