/* Chapter-specific layout only. Electricity's stylesheet owns the palette,
   typography, chrome, buttons, panel conventions and responsive shell. */
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.ec-action.primary[aria-pressed=true]{background:var(--ec-mint);color:var(--ec-deep)}.mf-extra{width:100%;max-width:880px;padding:0 22px 24px;margin:0 auto;flex-shrink:0}.mf-root .mf-safety{font-size:12px;color:var(--ec-secondary);border-top:1px solid var(--ec-border);padding-top:12px;margin:16px 0}.mf-safety strong{color:var(--ec-cream);font-weight:600}.mf-root h2{font-size:21px;font-weight:600;line-height:1.35;color:var(--ec-text);margin:18px 0 12px}.mf-root h3{font-size:17px;font-weight:600;color:var(--ec-text);line-height:1.45;margin:10px 0}.mf-small{font-size:12px;line-height:1.5;color:var(--ec-secondary)}.mf-root a{color:var(--ec-mint);text-underline-offset:4px}.mf-root details{border-block:1px solid var(--ec-border);padding:14px 0;margin:20px 0}.mf-root summary{cursor:pointer;min-height:44px;display:flex;align-items:center;font-size:15px;font-weight:600;color:var(--ec-light)}.mf-root details p{font-size:15px;line-height:1.6;color:var(--ec-secondary)}.mf-root ol{padding-left:22px}.mf-root li{margin:10px 0}.mf-source{font-size:11px;color:var(--ec-muted);margin:22px 0}.mf-check{border-top:1px solid var(--ec-border);padding-top:18px;margin-top:26px}.mf-check .ec-actions{flex-direction:column;align-items:stretch}.mf-check .ec-action{justify-content:flex-start;text-align:left}.mf-check .ec-feedback{margin-top:16px}.mf-root .mf-count{font-size:12px;color:var(--ec-secondary);margin-left:auto}.mf-root .ec-controls .ec-next{margin-left:0}.mf-root .ec-map a{display:flex;gap:12px;text-decoration:none;align-items:center;border-bottom:1px solid var(--ec-border);padding:13px 0;width:100%;font-size:14px;line-height:1.45}.mf-map-num{color:var(--ec-muted);font-size:12px}.mf-root .ec-map [aria-current=step]{color:var(--ec-light);font-weight:700}.mf-map-name{flex:1}.mf-root .ec-map h2{margin:0}.mf-root .ec-map [data-action=close-map]{font-size:14px}.mf-root .mf-reading{max-width:680px;margin:0 auto;padding:4px 22px 0}.mf-reading p:not(.ec-focus){color:var(--ec-secondary);font-size:16px;line-height:1.6;margin:0 0 16px}.mf-equation{display:flex;align-items:center;justify-content:center;gap:10px;flex-wrap:wrap;padding:16px 0;border-block:1px solid var(--ec-border);margin:16px 0;font-size:20px;line-height:1.7;color:var(--ec-text)}.mf-equation>div{display:flex;align-items:center;justify-content:center;gap:8px;flex-wrap:wrap}.mf-term{white-space:nowrap}.mf-term b{color:var(--ec-mint);font-weight:700;margin-right:3px}.mf-term small{font-size:.7em;color:var(--ec-secondary);margin-left:3px}.mf-term sub{font-size:.65em}.mf-arrow{text-align:center;display:flex;flex-direction:column;font-size:27px;line-height:1.2;min-width:34px}.mf-arrow small{font-size:11px;color:var(--ec-cream);max-width:150px;line-height:1.4}.mf-plus{color:var(--ec-muted)}.mf-observation{min-height:3em}.mf-root select{width:100%;min-height:46px;border:1px solid var(--ec-border);border-radius:8px;background:var(--ec-deep);color:var(--ec-text);padding:10px 12px;max-width:100%}.mf-label{display:block;margin:10px 0 7px;font-size:14px;color:var(--ec-secondary)}.mf-workshop{margin:12px 0 22px}.mf-coefficients{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:16px 0}.mf-coefficient{border:1px solid var(--ec-border);border-radius:10px;background:var(--ec-surface);padding:12px 10px;min-width:0}.mf-coefficient .mf-side{color:var(--ec-secondary);font-size:11px;text-transform:uppercase;letter-spacing:.06em}.mf-coefficient .mf-term{font-size:22px;display:block;margin:8px 0;text-align:center}.mf-stepper{display:flex;align-items:center;justify-content:space-between;gap:8px}.mf-root .mf-stepper .ec-action{min-width:44px;min-height:44px;padding:7px;font-size:21px}.mf-stepper output{font-size:23px;font-variant-numeric:tabular-nums;color:var(--ec-light)}.mf-atoms{border-top:1px solid var(--ec-border);margin:18px 0}.mf-atom-row{display:grid;grid-template-columns:42px 1fr 1fr;gap:12px;border-bottom:1px solid var(--ec-border);padding:12px 0;align-items:start}.mf-atom-row>strong{color:var(--ec-light);font-size:17px}.mf-atom-row span{font-size:14px}.mf-atom-head{font-size:12px;color:var(--ec-secondary)}.mf-dots{display:flex;gap:3px;flex-wrap:wrap;max-width:100%;margin-top:6px}.mf-dots i{width:8px;height:8px;border-radius:50%;background:var(--atom);display:block;flex:0 0 8px}.mf-atom-row.match{border-left:2px solid var(--ec-mint);padding-left:8px}.mf-atom-row.mismatch{border-left:2px solid var(--ec-cream);padding-left:8px}.mf-status{font-size:17px;color:var(--ec-light);margin:14px 0;line-height:1.5}.mf-question{border-top:1px solid var(--ec-border);padding:18px 0;margin-top:20px}.mf-question textarea{display:block;width:100%;resize:vertical;min-height:94px;border:1px solid var(--ec-border);border-radius:8px;padding:10px 12px;background:var(--ec-deep);color:var(--ec-text);font-size:16px}.mf-question .ec-actions{gap:8px}.mf-question .ec-action{font-size:13px}.mf-question details{margin:12px 0}.mf-question .mf-question-tag{font-size:11px;color:var(--ec-mint);letter-spacing:.08em;text-transform:uppercase}.mf-reference{display:grid;gap:12px}.mf-reference article{border-top:1px solid var(--ec-border);padding-top:12px}.mf-tags{display:flex;gap:7px;flex-wrap:wrap;margin:10px 0}.mf-tags span{color:var(--ec-light);font-size:12px;border-bottom:1px solid var(--ec-border);padding:4px 0;margin-right:8px}.mf-results{display:grid;grid-template-columns:1fr 1fr;gap:14px}.mf-beaker-result{border-top:1px solid var(--ec-border);padding-top:12px}.mf-beaker-result strong{display:block;font-size:24px;font-weight:500;color:var(--ec-light)}.mf-beaker-result p{font-size:14px;color:var(--ec-secondary)}.mf-root .mf-link-grid{display:grid;gap:12px;grid-template-columns:1fr 1fr}.mf-link-grid .ec-action{justify-content:flex-start;text-align:left}.mf-filter{display:flex;gap:8px;flex-wrap:wrap;margin:16px 0}.mf-filter .ec-action{font-size:13px}.mf-ui-note{font-size:12px;color:var(--ec-muted)}
@media(min-width:760px){.mf-root .ec-scene{flex:1 1 55%!important;min-height:0!important;padding:12px 0}.mf-root .ec-panel{flex:0 0 42%;align-self:flex-start;padding:14px 0 20px 24px}.mf-coefficients{grid-template-columns:repeat(4,minmax(0,1fr))}.mf-root .mf-reading{max-width:880px;padding:12px 22px}.mf-root .mf-extra{padding-top:12px}.mf-check .ec-actions{flex-direction:row;flex-wrap:wrap}.mf-check .ec-action{flex:1}.mf-root .ec-map .ec-action{font-size:14px}}
@media(max-width:430px){.mf-root .ec-heading{padding-inline:22px}.mf-root .ec-scene svg text{font-size:19px}.mf-equation{font-size:18px}.mf-equation .mf-arrow{flex-basis:100%;font-size:26px}.mf-equation .mf-arrow small{max-width:none}.mf-root .mf-link-grid{grid-template-columns:1fr}.mf-coefficient .mf-term{font-size:20px}.mf-atoms{font-variant-numeric:tabular-nums}}

.mf-root{grid-template-columns:minmax(0,1fr)}.mf-root .ec-chapter-title{min-width:0}
.mf-root .ec-topbar button,.mf-root .ec-topbar a{flex-shrink:0}

.mf-root{grid-template-columns:minmax(0,1fr)}.mf-root .ec-topbar button,.mf-root .ec-topbar a{flex-shrink:0}.mf-root .ec-chapter-title{min-width:0}.mf-root .ec-scene{min-width:0}.mf-controls{padding:8px 0}.mf-control{margin:12px 0}.mf-control label{display:block;color:var(--ec-secondary);font-size:14px;margin-bottom:6px}.mf-control input[type=range]{display:block;width:100%;min-height:44px;accent-color:var(--ec-mint)}.mf-root .ec-workbench{padding-top:8px}.mf-readout{border-left:2px solid var(--ec-mint);padding:4px 0 4px 15px;color:var(--ec-text);font-size:16px;line-height:1.5;margin:16px 0}.mf-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.mf-card{padding:15px;border:1px solid var(--ec-border);border-radius:10px;background:var(--ec-surface);min-width:0}.mf-card strong{display:block;color:var(--ec-light);font-size:20px;margin-bottom:8px}.mf-card p{font-size:14px;color:var(--ec-secondary);margin:8px 0}.mf-controls .ec-actions{flex-wrap:wrap;gap:8px}.mf-controls .ec-action{font-size:13px}.mf-controls output{font-weight:600;color:var(--ec-light)}.mf-notebook{border-collapse:collapse;width:100%;font-size:14px}.mf-notebook th,.mf-notebook td{padding:12px 8px;text-align:left;border-bottom:1px solid var(--ec-border);vertical-align:top;overflow-wrap:anywhere}.mf-notebook th{color:var(--ec-mint)}.mf-ion{font-size:20px;color:var(--ec-light);margin:16px 0}.mf-question input{font:inherit;font-size:16px;max-width:100%;width:100%;min-height:46px;color:var(--ec-text);background:var(--ec-deep);border:1px solid var(--ec-border);border-radius:8px;padding:10px}.mf-root .mf-note{font-size:12px;line-height:1.6;color:var(--ec-muted)}.mf-root .mf-workshop{margin-top:12px}.mf-root .mf-pairs{display:flex;gap:12px;flex-wrap:wrap}.mf-pairs span{padding:12px;border:1px solid var(--ec-border);border-radius:10px;background:var(--ec-surface)}.mf-swatches{display:flex;gap:4px}.mf-swatches span{height:28px;flex:1}.mf-root .mf-evidence{margin-top:0}.mf-root .mf-evidence .mf-extra{padding-top:0}.mf-root [data-action=next]{white-space:nowrap}.mf-root .mf-reading{padding-bottom:15px}.mf-reference-note{border-left:2px solid var(--ec-cream);padding-left:14px}.mf-root .mf-exact-label{color:var(--ec-mint);font-size:11px;letter-spacing:.1em;text-transform:uppercase}
@media(max-width:430px){.mf-grid{grid-template-columns:1fr}.mf-root .ec-scene svg text{font-size:18px}.mf-notebook th,.mf-notebook td{padding:10px 5px}.mf-coefficient .mf-term{font-size:18px}.mf-root .mf-arrow{flex-basis:100%}}

.mf-controls{padding:10px 0}.mf-readout{min-height:3em}.mf-model-note{font-size:12px;color:var(--ec-muted);line-height:1.5;margin:12px 0}.mf-root .ec-scene svg{overflow:visible}.mf-rule-grid{display:grid;grid-template-columns:1fr;gap:10px}.mf-rule-grid p{padding:12px 14px;margin:0;border:1px solid var(--ec-border);border-radius:10px;background:var(--ec-surface)}.mf-root .ec-controls [data-action=next]{white-space:nowrap}.mf-root .mf-prediction{margin:15px 0}.mf-root .mf-question label{display:block}.mf-root .mf-question form{display:flex;gap:8px;flex-wrap:wrap}.mf-root .mf-question form input{flex:1;min-width:100px}.mf-root .mf-question form p{flex-basis:100%}.mf-root .mf-check-options{display:flex;gap:10px;flex-wrap:wrap}.mf-root .mf-check-options button{flex:1;text-align:left;justify-content:flex-start}.mf-root .mf-check{margin-top:20px}.mf-root .mf-controls .ec-action[aria-pressed=true]{background:var(--ec-hover);border-color:var(--ec-mint);color:var(--ec-light)}
@media(max-width:760px){.mf-root .mf-check-options{flex-direction:column}}