:root{--sidebar-bg:#070713;--sidebar-hover:#ffffff0a;--sidebar-active:#f15f2538;--sidebar-text:#b9b9c6;--sidebar-text-hover:#c5d0dc;--sidebar-text-active:#fff;--sidebar-border:#ffffff0f;--sidebar-w:252px;--primary:#cc4711;--primary-lt:#cc47111a;--primary-dk:#be400f;--body-bg:#fff7f2;--bg-surface:#fff;--bg-surface-secondary:#f9fafb;--border-color:#efe6f7;--border-color-light:#eff0f3;--border-translucent:#04204514;--text:#070713;--text-secondary:#4a4a50;--text-muted:#7e8896;--text-disabled:#c0c7cf;--blue:#066fd1;--azure:#4299e1;--green:#2fb344;--lime:#74b816;--yellow:#f59f00;--orange:#f76707;--red:#d63939;--pink:#d6336c;--purple:#ae3ec9;--indigo:#4263eb;--cyan:#17a2b8;--green-lt:#2fb3440f;--red-lt:#d639390f;--yellow-lt:#f59f000f;--blue-lt:#066fd10f;--azure-lt:#4299e10f;--purple-lt:#ae3ec90f;--cyan-lt:#17a2b80f;--radius:10px;--radius-sm:6px;--radius-lg:16px;--space-1:4px;--space-2:8px;--space-3:12px;--space-4:16px;--space-5:24px;--space-6:32px;--space-7:48px;--space-8:64px;--shadow:#1e26330a 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print{.bc-speech-bar{display:none!important}}.bc-ns{max-width:1040px}@media (min-width:1280px){.bc-ns{max-width:1480px}.bc-ns-form{grid-template-columns:minmax(0,1fr) minmax(0,1fr);align-items:start;column-gap:16px;display:grid}.bc-ns-form>.bc-ns-more,.bc-ns-form>.bc-ns-go{grid-column:1/-1}.bc-ns-lead{max-width:900px}}.bc-ns-lead{color:var(--bc-ink-2);margin:0 0 16px;font-size:1.05rem}.bc-ns-class{margin-bottom:16px}.bc-ns-step{margin-bottom:16px;padding:20px 24px 22px}.bc-ns-h{font-family:var(--bc-head-font);color:var(--bc-ink);align-items:center;gap:10px;margin:0 0 12px;font-size:1.25rem;font-weight:800;display:flex}.bc-ns-h>span{background:var(--bc-purple);color:#fff;border-radius:50%;flex:none;place-items:center;width:32px;height:32px;font-size:1rem;display:grid}.bc-ns-h small{font-family:inherit;font-size:.9rem;font-weight:600}.bc-ns-hint{color:var(--bc-ink-2);margin:-4px 0 0}.bc-ns-drop{text-align:center;flex-direction:column;justify-content:center;min-height:104px}.bc-ns-drop .bc-drop-icon{font-size:2.2rem}.bc-ns-or{color:var(--bc-ink-2);align-items:center;gap:12px;margin:14px 0 8px;font-weight:700;display:flex}.bc-ns-or:before,.bc-ns-or:after{content:"";border-top:2px dashed var(--bc-lav);flex:1}.bc-ns-more summary{cursor:pointer;margin:0;list-style:none}.bc-ns-more summary::-webkit-details-marker{display:none}.bc-ns-more summary:after{content:"▸";color:var(--bc-ink-2);margin-left:auto}.bc-ns-more[open] summary{margin-bottom:12px}.bc-ns-more[open] summary:after{content:"▾"}.bc-ns-more .bc-ns-hint{margin:0 0 12px}@media (min-width:992px){.bc-ns-go{z-index:5;position:sticky;bottom:12px}}.bc-ns-go{border:2px solid var(--bc-lav);background:#fff;margin:0 0 18px;box-shadow:0 8px 24px #2814781f}.bc-ns-go small{color:var(--bc-ink-2);font-size:.95rem;font-weight:600}.bc-ns-go[data-ready]{border-color:#19875680}.bc-ns-go[data-ready] small{color:#157347}.bc-ns-addmore{margin-top:8px}.bc-ns-out:empty{display:none}:root[data-theme=dark] .bc-ns-go{background:var(--bg-card,#1d1a2e)}.bc-prog-sec{min-width:0;max-width:100%;margin-top:22px}.bc-prog-sec .bc-sec-h{font-size:1.2rem}.bc-next{padding:6px 18px}.bc-next-row{border-bottom:1px solid #eceef3;align-items:center;gap:14px;padding:12px 0;display:flex}.bc-next-row:last-of-type{border-bottom:0}.bc-next-ico{flex:none;font-size:1.4rem}.bc-next-what{flex:1;min-width:0}.bc-next-what b{font-weight:700;display:block}.bc-next-what small{color:#555b6e;display:block}.bc-next-note{margin:6px 0 10px}.bc-next-none{margin:12px 0;font-weight:600}.bc-subjects{padding:4px 18px}.bc-subj{border-bottom:1px solid #eceef3}.bc-subj:last-child{border-bottom:0}.bc-subj-head{cursor:pointer;grid-template-columns:minmax(8rem,12rem) minmax(120px,1fr) auto auto;align-items:center;gap:8px 18px;padding:14px 0;list-style:none;display:grid}.bc-subj-head::-webkit-details-marker{display:none}.bc-subj-empty .bc-subj-head{cursor:default;grid-template-columns:minmax(8rem,12rem) 1fr auto}.bc-subj-name{font-family:var(--bc-head-font);font-size:1.1rem;font-weight:700}.bc-subj-counts{white-space:nowrap}.bc-subj-more,.bc-subj-go{color:var(--bc-purple);white-space:nowrap;font-weight:700}details.bc-subj .bc-subj-more:after{content:" ▾"}details.bc-subj[open] .bc-subj-more:after{content:" ▴"}.bc-subj-note{margin:0 0 6px}.bc-topics{margin:0 0 14px;padding:0;list-style:none}.bc-topics li{border-left:3px solid #eceef3;justify-content:space-between;align-items:baseline;gap:16px;padding:8px 0 8px 12px;display:flex}.bc-topic-what{min-width:0}.bc-topic-what small{display:block}.bc-history{min-width:0;padding:4px 8px 8px;overflow:hidden}.bc-history .table{margin:0}.bc-hist-subj{display:block}.bc-history .table-wrap{position:relative}@media (max-width:700px){.bc-subj-head{grid-template-columns:1fr auto}.bc-subj-bar{order:3;grid-column:1/-1}.bc-subj-counts{white-space:normal;order:4;grid-column:1/-1}.bc-next-row{flex-wrap:wrap}}.bc-or-list{gap:12px;margin:12px 0;padding:0;list-style:none;display:grid}.bc-or-item{border:1px solid var(--border-color);background:var(--bg-surface,#fff);overflow-wrap:anywhere;border-radius:16px;min-width:0;padding:14px 16px}.bc-or-head{align-items:flex-start;gap:10px;display:flex}.bc-or-head b,.bc-or-head small{display:block}.bc-or-ico{font-size:1.4rem;line-height:1}.bc-or-take{margin-top:10px}.bc-or-take b{color:var(--text-secondary);font-size:.85rem;display:block}.bc-or-take p{margin:2px 0 0}.bc-or-take .btn-link{padding-left:0}.bc-or-file{flex-wrap:wrap;align-items:center;gap:8px;margin-top:10px;display:flex}.bc-or-share{border:0;min-width:0;margin:12px 0 0;padding:0}.bc-or-share legend{margin-bottom:4px;font-size:.9rem;font-weight:700}.bc-or-share label{flex-wrap:wrap;align-items:center;gap:6px;margin:4px 0;display:flex}.bc-or-share-none{margin:10px 0 0}.bc-or-item .learner-actions{margin-top:12px}.bc-or-grid{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px;display:grid}.bc-or-warn{background:#fff7e0;border-radius:10px;margin:8px 0;padding:8px 12px;font-size:.9rem}.bc-or-form .bc-field-row{gap:4px;margin-bottom:10px;display:grid}.bc-or-shared{margin-bottom:16px}.bc-or-shared .bc-or-list{padding:0 16px 4px}.bc-prefs-body>.bc-pref.bc-pref-pick{flex-direction:column;grid-column:auto;align-items:stretch}.bc-prefs-body>.bc-pref.bc-pref-pick .form-control,.bc-tabpanel .bc-pref-pick select{max-width:none}.bc-sup-glance{display:none}@media (min-width:1500px){.bc-sup-layout{grid-template-columns:minmax(0,1fr) 340px;align-items:start;gap:28px;display:grid}.bc-sup-glance{background:#f4f1ff;border:1px solid #e3dcfb;border-radius:16px;margin-top:14px;padding:16px 18px;display:block;position:sticky;top:76px}.bc-sup-glance .bc-sec-h{margin:0 0 4px}.bc-sup-glance .bc-glance-note{margin:0 0 10px;font-size:.85rem}.bc-sup-glance .bc-glance-group{border-top:1px solid #e3dcfb;padding:8px 0}.bc-sup-glance .bc-glance-group>b{text-transform:uppercase;letter-spacing:.04em;color:#5b4fc4;margin-bottom:4px;font-size:.82rem;display:block}.bc-sup-glance .bc-glance-group ul{margin:0;padding-left:18px;line-height:1.45}.bc-sup-glance .bc-glance-group p,.bc-sup-glance .bc-glance-group dl{margin:0}.bc-sup-glance .bc-glance-group dt{color:#6b6590;font-size:.85rem;font-weight:500}.bc-sup-glance .bc-glance-group dd{margin:0 0 6px;font-weight:700}.bc-tabpanel .bc-profile .bc-prefs-body{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:0 32px}.bc-profile .bc-prefs-body>.bc-chipfield{grid-column:auto}}.bc-np{padding:18px 22px 20px;overflow:hidden}.bc-np .btn-lg{height:auto;min-height:48px;font-size:1.05rem;font-family:var(--bc-head-font);padding:10px 24px}.bc-np>.learner-actions{margin:14px 0 0}.card.bc-np>.bc-fb,.card.bc-np>.bc-opts,.card.bc-np>.bc-cards{margin-left:0;margin-right:0}.bc-np-track{height:40px;margin:2px 26px 10px 8px;position:relative}.bc-np-line{background:var(--bc-lav);border-radius:99px;justify-content:space-around;align-items:center;height:10px;display:flex;position:absolute;top:50%;left:0;right:0;transform:translateY(-50%)}.bc-np-dot{background:#d6cef8;border:2px solid #fff;border-radius:50%;width:10px;height:10px}.bc-np-dot.hit{background:#22b573}.bc-np-dot.miss{background:#f7a21b}.bc-np-dot.now{background:var(--bc-purple);transform:scale(1.35)}.bc-np-rider{filter:drop-shadow(0 3px 2px #00000026);font-size:1.9rem;line-height:1;transition:left .5s cubic-bezier(.3,1.4,.5,1);position:absolute;top:50%;transform:translate(-50%,-58%)}.bc-np-flag{font-size:1.4rem;position:absolute;top:50%;right:-24px;transform:translateY(-50%)}.bc-np-top{flex-wrap:wrap;align-items:center;gap:10px;margin-bottom:8px;display:flex}.bc-np-count{font-family:var(--bc-head-font);color:var(--bc-purple-dk);font-weight:800}.bc-np-streak{color:#c2410c;background:#fff1e8;border-radius:99px;padding:2px 12px;font-weight:800;animation:.35s bc-np-pop}.bc-auto{border:2px solid var(--bc-lav-dk);color:var(--bc-ink-2);font:inherit;cursor:pointer;background:#fff;border-radius:99px;margin-left:auto;padding:6px 14px;font-size:.9rem;font-weight:700}.bc-auto[aria-pressed=true]{background:var(--bc-purple);border-color:var(--bc-purple);color:#fff}.bc-auto:focus-visible{outline:3px solid var(--bc-purple);outline-offset:2px}.bc-auto+.bc-say{margin-left:0}.bc-np-start>.bc-auto{margin:12px auto 0;display:block}.bc-sn-tools{justify-content:flex-end;margin:-4px 0 10px;display:flex}.bc-say{border:2px solid var(--bc-lav-dk);cursor:pointer;background:#fff;border-radius:50%;flex:none;width:42px;height:42px;margin-left:auto;font-size:1.2rem}.bc-say:hover{background:var(--bc-lav)}.bc-say:focus-visible{outline:3px solid var(--bc-purple);outline-offset:2px}.bc-np-q{background:linear-gradient(160deg, #fff 0%, var(--bc-lav) 100%);border:2px solid var(--bc-lav-dk);border-radius:22px;margin-bottom:14px;padding:16px 18px}.bc-np-qline{align-items:center;gap:14px;display:flex}.bc-np-qline p{font-family:var(--bc-head-font);color:var(--bc-ink);margin:0;font-size:1.35rem;font-weight:700;line-height:1.3}.bc-np-qemo{flex:none;font-size:3rem;line-height:1;animation:2.4s ease-in-out infinite bc-np-bob}.bc-np-opts{grid-template-columns:1fr 1fr;gap:12px;margin:0 0 12px}.bc-np-opt{border:2px solid color-mix(in srgb, var(--h) 35%, #fff);min-height:64px;box-shadow:0 5px 0 color-mix(in srgb, var(--h) 45%, #fff);font:inherit;text-align:left;color:var(--bc-ink);cursor:pointer;background:#fff;border-radius:18px;align-items:center;gap:10px;padding:12px 40px 12px 12px;font-size:1.05rem;font-weight:700;transition:transform .12s,box-shadow .12s,background .2s;display:flex;position:relative}.bc-np-opt:hover:not(:disabled){background:color-mix(in srgb, var(--h) 7%, #fff);transform:translateY(-2px)}.bc-np-opt:active:not(:disabled){box-shadow:0 1px 0 color-mix(in srgb, var(--h) 45%, #fff);transform:translateY(4px)}.bc-np-opt:focus-visible{outline:3px solid var(--h);outline-offset:2px}.bc-np-opt:disabled{cursor:default}.bc-np-opt.is-right{background:#e6f8ef;border-color:#22b573;animation:.4s bc-np-pop;box-shadow:0 5px #9be0be}.bc-np-opt.is-wrong{background:#fff1e8;border-color:#f7a21b;animation:.4s bc-np-shake;box-shadow:0 5px #fbd08a}.bc-np-opt.is-dim{opacity:.5}.bc-np-opt.is-heard{outline:3px dashed var(--h);outline-offset:3px}.bc-choice-mic{flex-direction:column;align-items:center;gap:6px;margin:14px 0 4px;display:flex}.bc-choice-mic .bc-mic{font-size:1rem}.bc-choice-mic .bc-mic-note{color:var(--bc-ink-2);text-align:center;min-height:1.2em}.bc-np-let{background:var(--h);color:#fff;height:34px;font-family:var(--bc-head-font);border-radius:10px;flex:0 0 34px;place-items:center;font-weight:800;display:grid}.bc-np-oemo{flex:none;font-size:1.6rem;line-height:1}.bc-np-mark{font-size:1.4rem;font-weight:900;position:absolute;top:50%;right:12px;transform:translateY(-50%)}.is-right>.bc-np-mark{color:#16925a}.is-wrong>.bc-np-mark{color:#c2410c}.bc-np-hintrow{margin-bottom:10px}.bc-np-hintbtn{font:inherit;cursor:pointer;color:var(--bc-ink);background:#fffbe0;border:2px dashed #e6cf00;border-radius:99px;padding:6px 16px;font-weight:700}.bc-np-hintbtn:hover{background:#fff6b0}.bc-np-hint{background:#fffbe0;border-radius:14px;padding:10px 14px;font-weight:600}.bc-np-fb{border-radius:18px;align-items:flex-start;gap:12px;padding:12px 14px;display:flex}.bc-np-fb b{font-family:var(--bc-head-font);margin-right:4px;font-size:1.15rem}.bc-np-fb>div{flex:1}.bc-np-fb.is-hit{background:#e6f8ef;border:2px solid #9be0be}.bc-np-fb.is-miss{background:#fff1e8;border:2px solid #fbd08a}.bc-np-fb[hidden]{display:none}.bc-np-fbemo{font-size:2rem;line-height:1}.bc-np-start{text-align:center;padding:10px 0 4px}.bc-np-start h3{font-family:var(--bc-head-font);margin:6px 0;font-size:1.6rem;font-weight:800}.bc-np-start p{color:var(--bc-ink-2);max-width:520px;margin:0 auto 8px}.bc-np-start .learner-actions{justify-content:center;margin-top:14px}.bc-np-hero{font-size:4.5rem;line-height:1.1;animation:2.4s ease-in-out infinite bc-np-bob}.bc-np-stars{letter-spacing:6px;font-size:2.6rem}.bc-np-stars span{color:#e3def7}.bc-np-stars span.on{color:#ffc400;text-shadow:0 3px #e0a800}.bc-np-score{font-size:1.2rem}.bc-np-score b{font-family:var(--bc-head-font);color:var(--bc-purple);font-size:2rem}.bc-np-review{text-align:left;margin-top:16px}.bc-np-review h4{font-family:var(--bc-head-font);font-weight:800}.bc-np-review .bc-np-rv{border:2px solid var(--bc-lav-dk);background:#fff;border-radius:16px;margin-bottom:8px;padding:10px 14px}.bc-np-review .bc-np-rv p{margin:0 0 6px;font-weight:700}.bc-np-review .bc-np-rv div{flex-wrap:wrap;gap:8px;display:flex}.bc-np-review .bc-np-rv span{border-radius:99px;padding:2px 12px;font-weight:700}.bc-np-review .bc-np-rv .is-wrong{color:#c2410c;background:#fff1e8;text-decoration:line-through}.bc-np-review .bc-np-rv .is-right{color:#16925a;background:#e6f8ef}.bc-np-review .bc-np-rv small{color:var(--bc-ink-2);margin-top:6px;display:block}.bc-dk-got{color:#16925a;font-weight:800}.bc-dk-bar{background:var(--bc-lav);border-radius:99px;height:10px;margin-bottom:14px;overflow:hidden}.bc-dk-bar span{background:linear-gradient(90deg,#22b573,#7ed957);border-radius:99px;height:100%;transition:width .4s;display:block}.bc-dk-card{cursor:pointer;perspective:1400px;width:100%;max-width:560px;min-height:290px;font:inherit;color:var(--bc-ink);background:0 0;border:0;margin:0 auto;padding:0;display:block}.bc-dk-card:focus-visible{outline:3px solid var(--bc-purple);outline-offset:4px;border-radius:26px}.bc-dk-in{min-height:290px;transform-style:preserve-3d;transition:transform .55s cubic-bezier(.3,1.2,.5,1);display:grid;position:relative}.bc-dk-card.on .bc-dk-in{transform:rotateY(180deg)}.bc-dk-face{backface-visibility:hidden;overflow-wrap:anywhere;border-radius:26px;flex-direction:column;grid-area:1/1;justify-content:center;align-items:center;gap:10px;padding:22px;display:flex}.bc-dk-front{background:linear-gradient(150deg, color-mix(in srgb, var(--h) 16%, #fff), #fff 70%);border:3px solid color-mix(in srgb, var(--h) 40%, #fff);box-shadow:0 8px 0 color-mix(in srgb, var(--h) 40%, #fff)}.bc-dk-back{border:3px solid var(--h);box-shadow:0 8px 0 color-mix(in srgb, var(--h) 60%, #fff);background:#fff;transform:rotateY(180deg)}.bc-dk-emo{font-size:3.6rem;line-height:1}.bc-dk-text{font-family:var(--bc-head-font);font-size:1.55rem;font-weight:800;line-height:1.25}.bc-dk-ans{font-size:1.3rem;font-weight:700}.bc-dk-tap{color:var(--bc-ink-2);font-size:.9rem;font-weight:600}.bc-dk-ex{background:#fffbe0;border-radius:14px;padding:8px 14px;font-size:1rem;font-weight:600}.bc-wd{justify-items:center;gap:6px;margin:2px 0;display:grid}.bc-wd-pos{color:var(--bc-purple-dk);background:var(--bc-lav);border-radius:999px;padding:2px 12px;font-size:.95rem;font-style:italic;font-weight:700}.bc-wd-row{flex-wrap:wrap;justify-content:center;align-items:center;gap:6px;font-size:.95rem;display:flex}.bc-wd-row b{letter-spacing:.06em;text-transform:uppercase;color:var(--bc-ink-2);font-size:.78rem}.bc-wd-w{border:2px solid var(--bc-lav-dk);background:#fff;border-radius:10px;padding:1px 9px;font-weight:700}.is-syn .bc-wd-w{border-color:#bfe9d3}.is-ant .bc-wd-w{border-color:#f8cdb9}.bc-dk-acts{flex-wrap:wrap;justify-content:center;gap:12px;margin-top:18px;display:flex}.bc-dk-acts[hidden]{display:none}.bc-dk-foot{text-align:center;margin-top:12px}.bc-flip{border-color:color-mix(in srgb, var(--h,var(--bc-lav)) 40%, #fff)}.bc-flip .f .bc-dk-emo{margin-bottom:4px;font-size:2rem;display:block}.bc-flip .b small{color:var(--bc-ink-2);margin-top:6px;font-weight:600;display:block}.bc-sn-hero{background:linear-gradient(130deg, var(--bc-purple), #8e6bff 60%, #f15f25 140%);color:#fff;border-radius:22px;align-items:center;gap:16px;margin-bottom:14px;padding:18px 20px;display:flex}.bc-sn-hero h2{font-family:var(--bc-head-font);color:#fff;margin:0;font-size:1.7rem;font-weight:800}.bc-sn-hero p{margin:4px 0 0;font-size:1.05rem}.bc-sn-hero small{opacity:.95}.bc-sn-hero .bc-say{align-self:flex-start}.bc-sn-big{flex:none;font-size:3.6rem;line-height:1}.bc-sn-jump{flex-wrap:wrap;gap:8px;margin-bottom:12px;display:flex}.bc-sn-jump button{border:2px solid color-mix(in srgb, var(--h) 40%, #fff);background:color-mix(in srgb, var(--h) 8%, #fff);font:inherit;cursor:pointer;color:var(--bc-ink);border-radius:99px;padding:4px 12px;font-size:.9rem;font-weight:700}.bc-sn-sec,.bc-sn-check{border:2px solid color-mix(in srgb, var(--h,var(--bc-purple)) 30%, #fff);border-left:8px solid var(--h,var(--bc-purple));background:color-mix(in srgb, var(--h,var(--bc-purple)) 4%, #fff);border-radius:20px;margin-bottom:14px;padding:14px 18px;scroll-margin-top:80px}.bc-sn-sec header,.bc-sn-check header{align-items:center;gap:10px;margin-bottom:6px;display:flex}.bc-sn-sec h3,.bc-sn-check h3{font-family:var(--bc-head-font);margin:0;font-size:1.3rem;font-weight:800}.bc-sn-emo{font-size:2.2rem;line-height:1}.bc-sn-pts{margin:4px 0 8px;padding:0;list-style:none}.bc-sn-pts li{padding:5px 0 5px 28px;font-size:1.08rem;line-height:1.45;position:relative}.bc-sn-pts li:before{content:"★";color:var(--h);position:absolute;top:5px;left:4px}.bc-sn-terms{grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:8px;margin-top:8px;display:grid}.bc-sn-term{border:2px dashed color-mix(in srgb, var(--h) 45%, #fff);background:#fff;border-radius:14px;padding:8px 12px}.bc-sn-term b{font-family:var(--bc-head-font);color:color-mix(in srgb, var(--h) 70%, #000);display:block}.bc-sn-term span{font-size:.95rem}.bc-sn-check{--h:#f7a21b}.bc-sn-q{background:#fff;border-radius:14px;margin-bottom:8px;padding:10px 14px}.bc-sn-q p{margin:0 0 6px;font-weight:700}.bc-sn-q .bc-sn-a{color:#16925a;margin:6px 0 0}.bc-sn-nav{justify-content:space-between;align-items:center;gap:10px;margin-top:4px;display:flex}.bc-sn-dots{gap:6px;display:flex}.bc-sn-dots span{background:var(--bc-lav-dk);border-radius:50%;width:10px;height:10px}.bc-sn-dots .done{background:#22b573}.bc-sn-dots .now{background:var(--bc-purple);transform:scale(1.3)}.bc-vz{border:2px solid 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