.elec-back{display:inline-block;margin:6px 0 26px}.elec-method-tabs{display:flex;gap:12px;flex-wrap:wrap;margin:24px 0}.elec-method-tabs a{border:1px solid var(--line,#dce4df);padding:14px 20px;border-radius:10px;text-decoration:none;color:var(--ink,#243c39);background:#fff}.elec-method-tabs a[aria-current]{background:#286c60;color:#fff;border-color:#286c60}.elec-thinking{padding:18px 22px;border-left:3px solid #ad793e;background:#f7f2e9;border-radius:0 8px 8px 0;margin:22px 0}.elec-start{display:inline-block;margin:8px 0;font-weight:700}.elec-diagram-caption{color:#607474;padding:0 24px 20px;font-size:14px;line-height:1.6}.elec-walk-header{display:flex;align-items:center;justify-content:space-between;gap:20px;margin:32px 0 14px}.elec-walk-header h2{margin:0}.elec-walk-header button{font-size:14px}.elec-answer,.elec-power{margin-top:24px}.elec-answer>summary,.elec-power>summary{font-weight:700;cursor:pointer}.elec-table-wrap{max-width:100%;overflow-x:auto;margin:20px 0}.elec-table-wrap table{width:100%;border-collapse:collapse;min-width:440px;text-align:left;font-size:15px}.elec-table-wrap caption{text-align:left;color:#607474;padding:0 0 12px}.elec-table-wrap td,.elec-table-wrap th{border-bottom:1px solid #dce4df;padding:12px 14px;vertical-align:top}.elec-table-wrap thead{background:#edf3ee}.elec-table-wrap tbody th{font-weight:600}.drill-grid .teaching-step{grid-template-columns:32px minmax(0,1fr);padding:18px 0;gap:12px;border-left:0;border-right:0;border-radius:0;background:transparent}.drill-grid .teaching-step h3{font-size:19px}.drill-grid .teaching-step .step-number{width:30px;height:30px}.drill-grid .teach-rule{width:100%}.drill-grid .teach-rule summary{display:block;font-size:14px;padding:10px}.drill-grid .teach-rule summary span{display:inline}.elec-power .katex-display,.elec-answer .katex-display,.problem-content .katex-display{overflow-x:auto;overflow-y:hidden;max-width:100%;padding:8px 0}.elec-roadmap li{min-width:0}.elec-power p{line-height:1.75}#elec-memory-note{background:#f1f6f1;padding:20px;border-radius:12px;line-height:1.7}[hidden]{display:none!important}
@media(max-width:700px){.elec-walk-header{align-items:flex-start;flex-direction:column}.elec-method-tabs{display:grid;grid-template-columns:1fr}.elec-method-tabs a{padding:12px 16px}.elec-thinking{padding:15px 17px}.elec-table-wrap table{font-size:14px}.elec-diagram-caption{padding:0 16px 16px}.drill-grid .teaching-step{grid-template-columns:26px minmax(0,1fr);gap:10px}.drill-grid .teaching-step .step-number{width:26px;height:26px;font-size:13px}.drill-grid .teaching-step h3{font-size:18px}.drill-grid .teach-do .katex-display{font-size:.85em}.elec-power,.elec-answer{padding:18px!important}}
.teaching-step>div{min-width:0}.teach-rule .katex-display{max-width:100%;overflow-x:auto;overflow-y:hidden}.elec-roadmap .eyebrow{line-height:1.6}