.bb-root{--bb-bg:#fff;--bb-panel:#f4f4f4;--bb-ink:#1e1e1e;--bb-muted:#5a5a5a;--bb-rule:#c6c6c6;--bb-rule-soft:#e2e2e2;--bb-blue:#324dc7;--bb-blue-deep:#26389c;--bb-highlight:#fdf07a;--bb-family:system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;background:var(--bb-bg);color:var(--bb-ink);font-family:var(--bb-family);grid-template-rows:auto minmax(0,1fr) auto;font-size:16px;line-height:1.5;display:grid;position:fixed;inset:0}.bb-root--plain{place-items:center;display:grid}.bb-root *,.bb-root :before,.bb-root :after{box-sizing:border-box}.bb-root button{font:inherit;cursor:pointer}.bb-root :focus-visible,.bb-linereader :focus-visible,.bb-float :focus-visible,.bb-alert :focus-visible{outline:2px solid var(--bb-blue,#324dc7);outline-offset:2px;border-radius:2px}.bb-toosmall{align-content:center;justify-items:start;gap:12px;max-width:30rem;padding:24px;display:none}.bb-toosmall__title{margin:0;font-size:22px;font-weight:700}.bb-toosmall p{margin:0}@media (max-width:819px){.bb-root:not(.bb-root--practice){grid-template-rows:minmax(0,1fr)}.bb-root:not(.bb-root--practice)>:not(.bb-toosmall){display:none}.bb-root:not(.bb-root--practice) .bb-toosmall{display:grid}.bb-root:not(.bb-root--practice) .bb-linereader,.bb-root:not(.bb-root--practice) .bb-float,.bb-root:not(.bb-root--practice) .bb-alert{display:none}}.bb-top{border-bottom:2px dashed var(--bb-rule);grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);align-items:center;gap:16px;padding:12px 24px 10px;display:grid}.bb-top__section{margin:0;font-weight:700}.bb-top__center{flex-direction:column;align-items:center;gap:2px;min-width:120px;display:flex}.bb-clock{font-variant-numeric:tabular-nums;margin:0;font-size:22px;font-weight:700}.bb-clock[data-alert=true]{color:#b3261e}.bb-clock-hidden,.bb-btn--tiny{border:1px solid var(--bb-ink);background:var(--bb-bg);border-radius:20px;padding:2px 12px;font-size:13px}.bb-top__right{justify-content:flex-end;align-items:center;gap:20px;display:flex}.bb-tool{background:0 0;border:0;border-radius:4px;padding:4px 10px;font-size:14px}.bb-tool[aria-pressed=true]{background:var(--bb-panel);font-weight:700}.bb-linklike{color:var(--bb-blue);background:0 0;border:0;padding:0;font-size:14px;text-decoration:underline}.bb-more{position:relative}.bb-more__menu{z-index:40;border:1px solid var(--bb-rule);background:var(--bb-bg);border-radius:6px;min-width:200px;padding:6px;display:grid;position:absolute;inset-block-start:calc(100% + 6px);inset-inline-end:0;box-shadow:0 6px 20px #0000002e}.bb-more__menu button{text-align:start;background:0 0;border:0;border-radius:4px;padding:8px 10px;font-size:14px}.bb-more__menu button:hover{background:var(--bb-panel)}.bb-directions{z-index:30;background:#fffffff7;position:absolute;inset:64px 0 0;overflow-y:auto}.bb-directions__body{justify-items:start;gap:16px;max-width:46rem;margin:0 auto;padding:32px 24px 48px;display:grid}.bb-main{min-height:0;overflow:hidden}.bb-main--split{grid-template-columns:1fr 1fr;display:grid}.bb-main--split .bb-pane--left{border-inline-end:2px solid var(--bb-rule)}.bb-main--single{display:grid}.bb-pane{min-height:0;padding:24px 32px 40px;overflow-y:auto}.bb-main--single .bb-pane{width:100%;max-width:46rem;margin:0 auto}.bb-passage{max-width:34rem;position:relative}.bb-passage__text{white-space:pre-wrap;margin:0}.bb-mark{background:var(--bb-highlight);color:inherit}.bb-mark[data-noted=true]{border-bottom:2px solid var(--bb-blue)}.bb-notes{border-top:1px solid var(--bb-rule-soft);gap:8px;margin:24px 0 0;padding:12px 0 0;list-style:none;display:grid}.bb-notes li{align-items:baseline;gap:8px;font-size:14px;display:flex}.bb-notes__marker{border:1px solid var(--bb-blue);color:var(--bb-blue);border-radius:3px;padding:1px 6px;font-size:11px;font-weight:700}.bb-annotate-popup{z-index:20;position:absolute;transform:translate(-50%,calc(-100% - 8px))}.bb-annotate-popup[data-below=true]{transform:translate(-50%,8px)}.bb-annotate-popup{border:1px solid var(--bb-rule);background:var(--bb-bg);border-radius:6px;gap:4px;padding:4px;display:flex;box-shadow:0 6px 20px #0000002e}.bb-annotate-popup button{white-space:nowrap;background:0 0;border:0;border-radius:4px;padding:6px 10px;font-size:13px}.bb-annotate-popup button:hover{background:var(--bb-panel)}.bb-note-editor{z-index:25;border:1px solid var(--bb-rule);background:var(--bb-bg);border-radius:6px;gap:8px;width:260px;padding:12px;font-size:14px;display:grid;position:absolute;inset-block-start:0;inset-inline-end:0;box-shadow:0 6px 20px #0000002e}.bb-note-editor textarea{font:inherit;border:1px solid var(--bb-rule);resize:vertical;border-radius:4px;padding:6px}.bb-note-editor__actions{justify-content:flex-end;gap:8px;display:flex}.bb-qhead{border-bottom:1px solid var(--bb-rule);align-items:center;gap:12px;padding-bottom:10px;display:flex}.bb-qnum{background:var(--bb-ink);width:26px;height:26px;color:var(--bb-bg);justify-content:center;align-items:center;font-size:14px;font-weight:700;display:inline-flex}.bb-mark-btn{background:0 0;border:0;border-radius:4px;align-items:center;gap:6px;padding:2px 6px;font-size:14px;display:inline-flex}.bb-flag{color:var(--bb-ink);display:block}.bb-qhead__right{align-items:center;gap:12px;margin-inline-start:auto;display:flex}.bb-abc{border:1px solid var(--bb-ink);background:var(--bb-bg);border-radius:4px;padding:2px 8px;font-size:13px;font-weight:700;text-decoration:line-through}.bb-abc[aria-pressed=true]{background:var(--bb-ink);color:var(--bb-bg)}.bb-figure{border:1px solid var(--bb-rule);background:var(--bb-panel);margin:20px 0 0;padding:10px 12px;font-size:14px}.bb-stem{margin:20px 0 0}.bb-choices{gap:10px;margin:20px 0 0;padding:0;list-style:none;display:grid}.bb-choice-row{align-items:center;gap:10px;display:flex}.bb-choice{border:1px solid var(--bb-rule);background:var(--bb-bg);text-align:start;border-radius:8px;flex:1;align-items:flex-start;gap:12px;padding:12px 14px;display:flex}.bb-choice__letter{border:1px solid var(--bb-ink);border-radius:50%;flex:none;justify-content:center;align-items:center;width:24px;height:24px;font-size:13px;font-weight:700;display:inline-flex}.bb-choice[data-selected=true]{border-color:var(--bb-blue);box-shadow:inset 0 0 0 1px var(--bb-blue)}.bb-choice[data-selected=true] .bb-choice__letter{background:var(--bb-blue);border-color:var(--bb-blue);color:var(--bb-bg)}.bb-choice[data-eliminated=true] .bb-choice__text{color:var(--bb-muted);text-decoration:line-through}.bb-choice[data-eliminated=true] .bb-choice__letter{color:var(--bb-muted);border-color:var(--bb-muted)}.bb-strike{border:1px solid var(--bb-ink);background:var(--bb-bg);border-radius:50%;flex:none;width:26px;height:26px;font-size:12px;font-weight:700;text-decoration:line-through}.bb-strike[data-on=true]{background:var(--bb-ink);color:var(--bb-bg)}.bb-spr{max-width:26rem;margin:20px 0 0}.bb-spr__label{font-size:14px;font-weight:700;display:block}.bb-spr__field{border:1px solid var(--bb-ink);width:12rem;font:inherit;font-variant-numeric:tabular-nums;border-radius:6px;margin-top:6px;padding:10px 12px;font-size:20px}.bb-spr__preview{min-height:20px;color:var(--bb-muted);margin:8px 0 0;font-size:14px}.bb-spr__rules{color:var(--bb-muted);margin:16px 0 0;padding-left:18px;font-size:13px}.bb-review{text-align:center;max-width:46rem;margin:0 auto;padding:32px 24px}.bb-review__title{margin:0;font-size:30px}.bb-review__lede{max-width:34rem;color:var(--bb-muted);margin:12px auto 0}.bb-review__panel{border:1px solid var(--bb-rule);text-align:start;border-radius:8px;margin-top:28px;padding:20px}.bb-review__panel-title{text-align:center;margin:0 0 12px;font-weight:700}.bb-main>.bb-review,.bb-main>.bb-summary{max-height:100%;overflow-y:auto}.bb-legend{border-bottom:1px solid var(--bb-rule-soft);flex-wrap:wrap;justify-content:center;gap:18px;padding-bottom:14px;font-size:13px;display:flex}.bb-legend__item{align-items:center;gap:6px;display:inline-flex}.bb-legend__swatch{border:1px solid var(--bb-ink);width:16px;height:16px}.bb-legend__swatch[data-kind=current]{border-style:dotted;border-width:2px}.bb-legend__swatch[data-kind=answered]{background:var(--bb-blue);border-color:var(--bb-blue)}.bb-grid{flex-wrap:wrap;gap:12px;margin:16px 0 0;padding:0;list-style:none;display:flex}.bb-grid__cell{border:1px dashed var(--bb-rule);background:var(--bb-bg);width:40px;height:40px;font-size:15px;position:relative}.bb-grid__cell[data-answered=true]{border-style:solid;border-color:var(--bb-blue);background:var(--bb-blue);color:var(--bb-bg)}.bb-grid__cell[data-current=true]{border:2px dotted var(--bb-ink)}.bb-grid__cell[data-marked=true]:after{content:"";background:var(--bb-ink);clip-path:polygon(0 0,100% 0,100% 100%,50% 76%,0 100%);width:11px;height:14px;position:absolute;inset-block-start:-6px;inset-inline-end:-4px}.bb-bottom{border-top:2px dashed var(--bb-rule);grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);align-items:center;gap:16px;padding:12px 24px;display:grid}.bb-bottom__name{margin:0;font-weight:700}.bb-bottom__center{justify-content:center;display:flex;position:relative}.bb-navtrigger{background:var(--bb-ink);color:var(--bb-bg);border:0;border-radius:6px;padding:6px 16px;font-size:14px;font-weight:700}.bb-nav{z-index:40;border:1px solid var(--bb-rule);background:var(--bb-bg);text-align:center;border-radius:8px;width:min(92vw,34rem);padding:18px;position:absolute;inset-block-end:calc(100% + 12px);inset-inline-start:50%;transform:translate(-50%);box-shadow:0 10px 30px #0003}.bb-nav__title{margin:0 0 12px;font-weight:700}.bb-nav .bb-grid{justify-content:center;margin-bottom:16px}.bb-bottom__right{justify-content:flex-end;gap:10px;display:flex}.bb-btn{border:1px solid var(--bb-ink);background:var(--bb-bg);color:var(--bb-ink);border-radius:20px;padding:8px 20px;font-size:14px;font-weight:700;text-decoration:none}.bb-btn:disabled{color:var(--bb-muted);border-color:var(--bb-rule);cursor:not-allowed}.bb-btn--primary{background:var(--bb-blue);border-color:var(--bb-blue);color:var(--bb-bg)}.bb-btn--primary:hover{background:var(--bb-blue-deep);border-color:var(--bb-blue-deep)}.bb-btn--primary:disabled{background:var(--bb-bg);border-color:var(--bb-rule);color:var(--bb-muted)}.bb-float{z-index:50;border:1px solid var(--bb-rule);background:var(--bb-bg);border-radius:8px;position:fixed;overflow:hidden;box-shadow:0 12px 34px #0000003d}.bb-float__bar{background:var(--bb-panel);border-bottom:1px solid var(--bb-rule);cursor:grab;touch-action:none;-webkit-user-select:none;user-select:none;align-items:center;gap:10px;padding:8px 10px;display:flex}.bb-float__grip{background:repeating-linear-gradient(to bottom, var(--bb-muted) 0 2px, transparent 2px 4px);width:18px;height:10px}.bb-float__title{font-size:14px;font-weight:700}.bb-float__expand{background:0 0;border:0;margin-inline-start:auto;font-size:13px;text-decoration:underline}.bb-float__close{background:0 0;border:0;font-size:13px;text-decoration:underline}.bb-float__body{padding:0}.bb-desmos{width:100%;height:420px}.bb-desmos[data-status=unavailable]{height:0}.bb-float__message{color:var(--bb-muted);margin:0;padding:16px;font-size:14px}.bb-float__resize{cursor:nwse-resize;touch-action:none;background:0 0;border:0;width:18px;height:18px;padding:0;position:absolute;inset-block-end:0;inset-inline-end:0}.bb-float__resize:before{content:"";background:linear-gradient(135deg, transparent 0 40%, var(--bb-muted) 40% 55%, transparent 55% 70%, var(--bb-muted) 70% 85%, transparent 85%);width:9px;height:9px;position:absolute;inset-block-end:3px;inset-inline-end:3px}.bb-reference{max-height:60svh;padding:14px 16px;font-size:14px;overflow-y:auto}.bb-reference dl{gap:10px;margin:0;display:grid}.bb-reference dt{color:var(--bb-muted);font-size:12px;font-weight:700}.bb-reference dd{font-variant-numeric:tabular-nums;white-space:pre;margin:2px 0 0}.bb-reference ul{border-top:1px solid var(--bb-rule-soft);margin:16px 0 0;padding-top:12px;padding-left:18px}.bb-linereader{z-index:45;pointer-events:none;position:fixed;inset:0}.bb-linereader__shade{pointer-events:auto;background:#1e1e1e8c;position:absolute;inset-block-start:0;inset-inline:0}.bb-linereader__shade--bottom{inset-block:auto 0;height:auto;bottom:0}.bb-linereader__band{pointer-events:auto;cursor:grab;touch-action:none;border-block:2px solid #ffd400;position:absolute;inset-inline:0}.bb-linereader__handle{background:#ffd400;border:0;border-radius:3px;width:56px;height:12px;position:absolute;inset-inline-start:50%;transform:translate(-50%)}.bb-linereader__handle--top{inset-block-start:-7px}.bb-linereader__handle--bottom{inset-block-end:-7px}.bb-linereader__close{color:#ffd400;background:#1e1e1ecc;border:1px solid #ffd400;border-radius:20px;padding:4px 12px;font-size:13px;position:absolute;inset-block-start:50%;inset-inline-end:16px;transform:translateY(-50%)}.bb-alert{z-index:60;background:#1e1e1e59;place-items:center;display:grid;position:fixed;inset:0}.bb-alert__body{background:var(--bb-bg);text-align:center;border-radius:8px;justify-items:center;gap:10px;width:min(90vw,24rem);padding:24px;display:grid;box-shadow:0 16px 40px #0000004d}.bb-alert__title{margin:0;font-size:20px;font-weight:700}.bb-endcard{text-align:center;max-width:30rem;font-family:var(--bb-family,system-ui, sans-serif);justify-items:center;gap:12px;padding:32px;display:grid}.bb-root--practice{height:100svh;max-height:100svh}.bb-passage--stem{max-width:none}.bb-timer-start{border:1px solid var(--bb-ink);background:var(--bb-bg);border-radius:20px;padding:2px 12px;font-size:13px}.bb-choice:disabled{cursor:default}.bb-choice[data-correct=true]{background:#eaf6ec;border-color:#1e7d32;box-shadow:inset 0 0 0 1px #1e7d32}.bb-choice[data-correct=true] .bb-choice__letter{color:var(--bb-bg);background:#1e7d32;border-color:#1e7d32}.bb-choice[data-wrong-selected=true]{border-color:#b3261e;box-shadow:inset 0 0 0 1px #b3261e}.bb-choice[data-wrong-selected=true] .bb-choice__letter{color:var(--bb-bg);background:#b3261e;border-color:#b3261e}.bb-distractor{color:var(--bb-muted);margin:8px 0 0;padding:0 14px;font-size:13px}.bb-solution{border:1px solid var(--bb-rule);background:var(--bb-panel);border-radius:8px;margin-top:24px;padding:14px 16px}.bb-solution__title{margin:0 0 6px;font-size:14px;font-weight:700}.bb-routes{border-top:1px solid var(--bb-rule);color:var(--bb-muted);margin:10px 0 0;padding-top:10px;font-size:13px}.bb-math-error{font-family:var(--font-mono,monospace);color:#b3261e;font-size:.9em}.bb-spr-result{margin:12px 0 0;font-size:15px}.bb-spr-result[data-correct=true]{color:#1e7d32;font-weight:700}.bb-spr-result[data-correct=false]{color:#b3261e;font-weight:700}.bb-report{border:1px dashed var(--bb-rule);border-radius:8px;gap:12px;max-width:30rem;margin-top:20px;padding:14px 16px;display:grid}.bb-report fieldset{border:0;gap:8px;margin:0;padding:0;display:grid}.bb-report legend{color:var(--bb-muted);padding:0 0 6px;font-size:13px;font-weight:700}.bb-report__option{align-items:center;gap:8px;font-size:14px;display:flex}.bb-report label{color:var(--bb-muted);gap:6px;font-size:13px;font-weight:700;display:grid}.bb-report textarea{font:inherit;color:var(--bb-ink);border:1px solid var(--bb-rule);resize:vertical;border-radius:6px;padding:8px;font-weight:400}.bb-report__actions{align-items:center;gap:10px;display:flex}.bb-report__confirm{color:#1e7d32;margin:0;font-weight:700}.bb-report__error{color:#b3261e;margin:0;font-size:13px}.bb-summary{max-width:46rem;margin:0 auto;padding:48px 24px}.bb-summary__title{margin:0;font-size:28px}.bb-summary__score{color:var(--bb-muted);margin:8px 0 0}.bb-summary__list{gap:8px;margin:24px 0 0;padding:0;list-style:none;display:grid}.bb-summary__row{border:1px solid var(--bb-rule);border-radius:8px;justify-content:space-between;gap:12px;padding:10px 14px;font-size:14px;display:flex}.bb-summary__label{flex:1;min-width:0}.bb-summary__row>span:last-child{white-space:nowrap}.bb-summary__row[data-correct=true]{border-color:#1e7d32}.bb-summary__row[data-correct=false]{border-color:#b3261e}.bb-summary__links{flex-wrap:wrap;gap:12px;margin-top:28px;display:flex}@media (max-width:819px){.bb-root--practice{grid-template-rows:auto minmax(0,1fr) auto;overflow-x:hidden}.bb-root--practice .bb-top{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:4px 12px;padding:6px 12px;display:flex}.bb-root--practice .bb-top__left{flex:auto;min-width:0}.bb-root--practice .bb-top__section{overflow-wrap:anywhere;font-size:16px}.bb-root--practice .bb-top__center{flex-direction:row;flex:none;align-items:center;gap:8px;min-width:0}.bb-root--practice .bb-top__right{flex-wrap:wrap;flex:1 0 100%;justify-content:flex-start;gap:4px}.bb-root--practice .bb-top__right .bb-more{margin-inline-start:auto}.bb-root--practice .bb-more__menu{min-width:220px;max-width:calc(100vw - 24px)}.bb-root--practice .bb-more__menu button{min-height:44px;padding:10px 12px;font-size:16px}.bb-root--practice .bb-tool,.bb-root--practice .bb-timer-start,.bb-root--practice .bb-clock-hidden,.bb-root--practice .bb-btn--tiny{min-width:44px;min-height:44px;padding:8px 12px;font-size:16px}.bb-root--practice .bb-linklike{align-items:center;min-width:44px;min-height:44px;font-size:16px;display:inline-flex}.bb-root--practice .bb-clock{font-size:20px}.bb-root--practice .bb-directions{z-index:55;background:var(--bb-bg);position:fixed;inset:0}.bb-root--practice .bb-directions__body{padding:20px 12px 40px}.bb-root--practice .bb-pane{overflow-wrap:break-word;padding:14px 12px 32px}.bb-root--practice .bb-main--split{grid-template-columns:minmax(0,1fr);overflow-y:auto}.bb-root--practice .bb-main--split .bb-pane{overflow-y:visible}.bb-root--practice .bb-main--split .bb-pane--left{border-inline-end:0;border-block-end:2px solid var(--bb-rule)}.bb-root--practice .bb-passage{max-width:none}.bb-root--practice .bb-qhead{flex-wrap:wrap;gap:4px 10px;padding-bottom:6px}.bb-root--practice .bb-qnum{width:32px;height:32px;font-size:16px}.bb-root--practice .bb-mark-btn{min-height:44px;padding:6px 8px;font-size:16px}.bb-root--practice .bb-qhead__right{flex-wrap:wrap;flex:1 0 100%;justify-content:flex-start;gap:4px 12px;margin-inline-start:0}.bb-root--practice .bb-abc{min-width:44px;min-height:44px;font-size:16px}.bb-root--practice .bb-choices{gap:12px}.bb-root--practice .bb-choice{min-height:44px;padding:12px}.bb-root--practice .bb-choice__letter{width:28px;height:28px;font-size:16px}.bb-root--practice .bb-choice__text{overflow-wrap:break-word;min-width:0}.bb-root--practice .bb-strike{width:44px;height:44px;font-size:16px}.bb-root--practice .bb-figure,.bb-root--practice .bb-distractor,.bb-root--practice .bb-routes,.bb-root--practice .bb-solution__title,.bb-root--practice .bb-spr-result,.bb-root--practice .bb-notes li{font-size:16px}.bb-root--practice .bb-notes__marker{padding:1px 8px;font-size:16px}.bb-root--practice .bb-spr{max-width:100%}.bb-root--practice .bb-spr__label,.bb-root--practice .bb-spr__preview,.bb-root--practice .bb-spr__rules{font-size:16px}.bb-root--practice 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