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svg{width:100%;height:auto;color:var(--fp-ink);overflow:visible}.sf-bar-base{fill:var(--fp-surface)}.sf-bar-fill{fill:#adcce8}[data-theme=dark] .sf-bar-fill{fill:#487ba7}.sf-bar-row line{stroke:currentColor;stroke-width:1px}.fp-scope .sf-bar-caption{text-align:center;color:var(--fp-muted);margin:12px 0 0;font-size:13px}.sf-teach-rule{background:var(--fp-page);border-radius:8px;flex-direction:column;gap:6px;padding:12px;font-size:17px;display:flex}.sf-teach-rule p{margin:4px 0 0;font-size:14px;line-height:1.4}.sf-reference{justify-content:center;padding:14px;display:flex}.sf-choices{justify-content:center;gap:12px;margin:16px 0;display:flex}.sf-choices .fp-button{min-width:76px;padding:12px}.sf-choices [aria-pressed=true]{outline:2px solid var(--sf-blue);background:var(--sf-blue-tint)}.sf-complete{padding:16px 0;font-size:16px;line-height:1.5}.sf-records{white-space:pre-wrap;font-size:12px}@media (height<=550px){.sf-heading{padding:6px 12px}.fp-scope .sf-heading h1{font-size:17px}.sf-keydock{padding-bottom:4px}.sf-keypad{gap:4px}.sf-actions{padding-block:4px}.sf-actions .fp-button{min-height:44px}.sf-keytools>span{font-size:11px}}@media (forced-colors:active){.sf-box.fp-button[data-active=true]{outline:3px solid highlight}.sf-box.fp-button{color:buttontext;background:buttonface;border-color:buttontext}.sf-bar-fill{fill:highlight}}.fp-scope .sf-entry-message{min-height:60px;line-height:1.3}.sf-entry-message[data-result=correct],.sf-entry-message[data-result=partial]{font-weight:600}@media (height<=550px){.sf-diagram,.sf-arrows{height:164px}.sf-equation{top:42px}}.ff-page .sf-keypad{grid-template-columns:repeat(6,minmax(44px,1fr))}.ff-page .sf-keypad .ff-context-key{background:var(--sf-blue-tint);color:var(--sf-blue-ink);border-color:color-mix(in srgb,var(--sf-blue) 30%,var(--fp-border));font-size:28px;font-weight:600}.ff-page .ff-context-key[aria-pressed=true]{outline:2px solid var(--sf-blue);outline-offset:-3px}.ff-page .ff-operation-box{width:44px;min-width:44px}.ff-help{flex-wrap:wrap;gap:8px;display:flex}.ff-reason-fractions{justify-content:center;align-items:center;gap:24px;margin:14px 0;display:flex}.ff-reasons{flex-direction:column;gap:8px;margin-bottom:12px;display:flex}.ff-reasons .fp-button{white-space:normal;text-align:left;justify-content:flex-start;min-height:44px;padding:8px;font-size:15px;line-height:1.35}.ff-reasons [aria-pressed=true]{outline:2px solid var(--sf-blue);background:var(--sf-blue-tint)}.ff-page .sf-box{scroll-margin-block:6px}.pf-page{--pf-key-surface:#272e34;--pf-key-face:#41474e;--pf-key-edit:#697680;--pf-math-face:#b8cbd5;--pf-math-ink:#173b4a}[data-theme=dark] .pf-page{--pf-key-surface:#101820;--pf-key-face:#29343f;--pf-key-edit:#394753;--pf-math-face:#4d6c81;--pf-math-ink:#fff}.pf-page .sf-keypad{background:var(--pf-key-surface);box-shadow:0 0 0 8px var(--pf-key-surface);border-radius:8px;padding:6px 0}.pf-page .sf-keypad .fp-button{--pf-face:var(--pf-key-face);background:linear-gradient(#ffffff0d,#0000000a),var(--pf-face);color:#fff;border:1px solid color-mix(in srgb,var(--pf-face) 75%,white);border-radius:10px;box-shadow:inset 0 1px #ffffff24,0 2px 2px #00000030}.pf-page .sf-keypad .ff-context-key{--pf-face:var(--pf-math-face);color:var(--pf-math-ink)}.pf-page .sf-keypad .fp-button:active:not(:disabled){color:#173b4a;background:#dbe9ef;box-shadow:inset 0 2px 3px #00000026}.pf-page .sf-keypad .ff-context-key[aria-pressed=true]{outline:2px solid var(--pf-math-ink);outline-offset:-4px}.pf-page .sf-keypad .fp-button:focus-visible{outline-offset:2px;outline:2px solid #fff}.pf-page .sf-keytools>button:not(.sf-tab){background:linear-gradient(#ffffff0d,#0000000a),var(--pf-key-edit);color:#fff;border:1px solid #87939c;min-width:44px;box-shadow:inset 0 1px #ffffff24,0 2px 2px #00000030}.pf-page .sf-tab{background:var(--fp-selected)}.pf-feedback-slot{min-height:68px;padding:4px 0 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.sf-box[data-locked=true]{background:var(--fp-evidence-bg);border-color:var(--fp-evidence);color:var(--fp-correct-ink)}.pf-teach-diagram{width:300px;max-width:100%;height:178px;color:var(--fp-ink);margin:8px auto;position:relative}.pf-teach-diagram svg{fill:none;width:100%;height:100%;stroke:var(--fp-teaching-inspection);stroke-width:2.5px;position:absolute;inset:0}.pf-teach-equation{justify-content:space-between;align-items:center;font-size:28px;display:flex;position:absolute;inset:50px 20px auto}.pf-teach-op{background:var(--fp-attention-bg);color:var(--fp-attention-ink);border-radius:6px;padding:1px 12px;font-size:21px;font-weight:600;position:absolute;left:50%;transform:translate(-50%)}.pf-top{top:8px}.pf-bottom{bottom:5px}.pf-step-list{flex-direction:column;gap:8px;margin:12px 0;display:flex}.pf-step-list .fp-button{white-space:normal;text-align:left;justify-content:space-between;gap:8px;min-height:44px;padding:10px}.pf-step-list .fp-button[aria-current=step]{border:2px solid 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