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ease}.bc-btn:active{border-bottom-width:var(--bc-press);transform:translateY(2px)}.bc-btn--primary{background:var(--bc-violet);border-bottom-color:var(--bc-violet-edge);color:var(--on-brand)}.bc-btn--primary:hover{background:var(--bc-violet-hover)}.bc-btn--secondary{padding:calc(var(--bc-btn-py) - var(--sp-2)) max(0px,calc(var(--bc-btn-px) - var(--sp-2))) var(--bc-btn-py);border:2px solid var(--bc-line-hover);border-bottom-width:var(--bc-edge);background:#fff;color:var(--bc-violet)}.bc-btn--secondary:hover{background:var(--bc-tint-deep);border-color:var(--bc-violet)}.bc-btn--secondary:active{border-bottom-width:2px;transform:translateY(2px)}.bc-btn--confirm{background:var(--bc-mint);border-bottom-color:var(--bc-mint-edge);color:var(--on-success)}.bc-btn--confirm:hover{background:var(--bc-mint-hover)}.bc-btn--danger{background:var(--danger);border-bottom-color:var(--danger-edge);color:#fff}.bc-btn--danger:hover{background:color-mix(in srgb,var(--danger),black 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ease}.bc-icon-btn:active{border-bottom-width:2px;transform:translateY(2px)}.bc-icon-btn--outline{border:2px solid var(--bc-line);border-bottom-width:4px;background:#fff;color:var(--bc-violet)}.bc-icon-btn--outline:hover{border-color:var(--bc-line-hover)}.bc-icon-btn--outline:active{border-bottom-width:2px}.bc-icon-btn--mint{background:var(--bc-mint);border-bottom-color:var(--bc-mint-edge);color:var(--on-success)}.bc-icon-btn--mint:hover{background:var(--bc-mint-hover)}.bc-icon-btn--ghost{width:40px;height:40px;border:none;border-radius:var(--bc-r-small);background:transparent;color:var(--bc-body-muted)}.bc-icon-btn--ghost:hover{background:var(--bc-tint);color:var(--bc-violet)}.bc-icon-btn--ghost:active{border-bottom-width:0;transform:translateY(1px)}.bc-icon-btn--circle{border-radius:50%}.bc-caret-btn{display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;width:32px;height:32px;margin:0 var(--sp-4) 0 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ease}.bc-tab:hover{border-color:var(--bc-line-hover);color:var(--bc-violet)}.bc-tab.is-selected{background:var(--bc-tint);border-color:var(--bc-violet);color:var(--bc-violet)}.bc-tab.is-locked{color:var(--bc-body-muted);cursor:not-allowed}.bc-tab.is-locked:hover{border-color:var(--bc-line);color:var(--bc-body-muted)}.bc-tab__count{font-size:var(--fs-2xs);font-weight:800;opacity:.55}.bc-badge{display:inline-flex;align-items:center;gap:var(--sp-4);font-family:var(--bc-font-body);font-weight:800;white-space:nowrap}.bc-badge--tint{padding:var(--sp-4) var(--sp-12);border-radius:var(--bc-r-pill);background:var(--bc-tint);color:var(--bc-violet);font-size:var(--fs-xs)}.bc-badge--tint.bc-badge--success{background:var(--quiz-correct-tint);color:var(--quiz-correct-text)}.bc-badge--tint.bc-badge--danger{background:var(--danger-tint);color:var(--danger-text)}.bc-badge--outline{padding:var(--sp-4) var(--sp-10);border:2px solid var(--bc-line);border-radius:var(--bc-r-pill);color:var(--bc-body-muted);font-size:var(--fs-xs)}.bc-switch{display:inline-flex;align-items:center;width:52px;height:31px;padding:3px;border-radius:var(--bc-r-pill);background:var(--bc-off);border-bottom:3px solid var(--bc-off-edge);cursor:pointer;transition:background .15s ease,border-color .15s ease,justify-content 0s;justify-content:flex-start}.bc-switch.is-on{background:var(--bc-mint);border-bottom-color:var(--bc-mint-edge);justify-content:flex-end}.bc-switch__knob{width:22px;height:22px;border-radius:50%;background:#fff}.bc-segmented{display:flex;gap:var(--sp-4);padding:var(--sp-4);border-radius:var(--r-14);background:var(--bc-tint)}.bc-segmented__seg{flex:1;padding:var(--sp-8) 0;border:none;border-radius:var(--bc-r-small);background:transparent;font-family:var(--bc-font-head);font-weight:800;font-size:var(--fs-sm);color:var(--bc-muted);cursor:pointer;transition:background .12s ease,color .12s ease}.bc-segmented__seg:hover{color:var(--bc-violet)}.bc-segmented__seg.is-active{background:var(--surface);border-bottom:3px solid var(--bc-off);color:var(--bc-violet)}[data-theme=night]{--bc-violet: var(--brand);--bc-violet-edge: var(--brand-edge);--bc-violet-text: var(--brand-text);--bc-violet-hover: var(--brand-hover);--bc-tint: #2d2b2b;--bc-tint-deep: #23211f;--bc-line: #3c3936;--bc-line-hover: #4a453f;--bc-hairline: #3c3936;--bc-divider: #444141;--bc-note-border: #4a453f;--bc-amber-line: #4a453f;--bc-off: #3c3936;--bc-off-edge: #2d2b2b;--bc-disabled-text: #7d7979;--bc-ink: #f8f4f4;--bc-body-muted: #bab6b6;--bc-muted: #9b9797;--bc-faint: #7d7979;--bc-note-body: #d7d3d3;--bc-ground: #181716;--bc-mark: rgba(225, 173, 102, .32);--bc-mark-ink: #f8f4f4}[data-theme=night][data-season=christmas]{--bc-tint: var(--brand-tint);--bc-tint-deep: var(--surface);--bc-line: var(--border);--bc-line-hover: var(--brand-border);--bc-hairline: var(--border);--bc-divider: var(--divider);--bc-note-border: var(--brand-border);--bc-amber-line: var(--brand-border);--bc-off: var(--border);--bc-off-edge: var(--brand-tint);--bc-ground: var(--bg);--bc-mark: color-mix(in srgb, var(--brand) 32%, transparent)}[data-theme=night] .bc-action,[data-theme=night] .bc-tile,[data-theme=night] .bc-lesson,[data-theme=night] .bc-section,[data-theme=night] .bc-stat,[data-theme=night] .bc-empty,[data-theme=night] .bc-tab,[data-theme=night] .bc-btn--secondary,[data-theme=night] .bc-icon-btn--outline,[data-theme=night] .bc-avatar-tile{background:var(--surface)}[data-theme=night] .bc-action__icon{background:var(--bc-tint)}[data-theme=night] .bc-note{background:var(--bc-tint-deep)}[data-theme=night] .bc-action.is-locked,[data-theme=night] .bc-action.is-locked:hover{background:var(--surface);border-color:var(--bc-line)}[data-theme=night] .bc-avatar-tile.is-selected 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100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.bc-sitenav__cta{margin-left:auto;text-decoration:none}.bc-sitenav__links{display:flex;align-items:center;gap:var(--sp-4)}.bc-sitenav__link{display:inline-flex;align-items:center;justify-content:center;min-height:44px;padding:0 var(--sp-12);border-radius:var(--r-10);font-family:var(--bc-font-head);font-size:var(--fs-md);font-weight:700;color:var(--text-2);text-decoration:none;white-space:nowrap}.bc-sitenav__link{transition:background var(--transition-fast) var(--transition-ease),color var(--transition-fast) var(--transition-ease)}.bc-sitenav__link:hover{background:var(--bc-tint);color:var(--brand-hover)}.bc-sitenav__link[aria-current]{color:var(--bc-ink);text-decoration:underline;text-decoration-color:var(--brand);text-decoration-thickness:3px;text-underline-offset:8px}.bc-sitenav__home:focus-visible,.bc-sitenav__link:focus-visible,.bc-sitenav__cta:focus-visible{outline:3px solid var(--brand);outline-offset:2px}.bc-sitenav__links--bar{display:none}.bc-sitenav__row{max-width:1200px;margin:0 auto;padding:var(--sp-4) var(--sp-16);justify-content:center;flex-wrap:wrap;border-bottom:1px solid var(--bc-line)}.bc-sitenav__short{display:none}@media(min-width:960px){.bc-sitenav__links--bar{display:flex}.bc-sitenav__row{display:none}}@media(max-width:600px){.bc-sitenav__bar{padding:var(--sp-8) var(--sp-16)}.bc-sitenav__wordmark{font-size:var(--fs-xl)}.bc-sitenav__row{justify-content:space-between;padding:var(--sp-4) var(--sp-8)}.bc-sitenav__link{padding:0 var(--sp-8)}.bc-sitenav__long{display:none}.bc-sitenav__short{display:inline}}.bc-sitefoot{max-width:1200px;margin:0 auto;padding:var(--sp-24);border-top:1px solid var(--bc-line);display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:var(--sp-12)}.bc-sitefoot__copy{font-size:var(--fs-sm);color:var(--text-3)}.bc-sitefoot__links{display:flex;flex-wrap:wrap;gap:var(--sp-8) 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