.help-first-action{padding:15px 17px;border-left:4px solid #e96658;background:#fff9f0;border-radius:0 8px 8px 0;margin-top:16px}.help-first-action b{font-size:12px}.help-first-action p{margin:7px 0 0;font-size:15px;line-height:1.85}.help-lesson{margin:17px 0}.help-introduction{font-size:15px;line-height:1.9}.help-rule{padding:18px 20px;border:1px solid #91bdb7;border-radius:11px;background:#f1f8f4;margin:18px 0}.help-rule h4{margin:0 0 9px}.help-rule>p{margin:7px 0 15px;font-size:13px;line-height:1.85}.help-rule>p:last-child{margin-bottom:0}.help-equation,.help-substitution{font-family:Georgia,'Times New Roman',serif;font-size:20px;line-height:1.75;color:#184c50;overflow-wrap:anywhere;white-space:pre-wrap}.help-symbols{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px;margin:16px 0}.help-symbols>div{padding:10px 13px;border:1px solid #d9d9cf;border-radius:7px;background:#fff}.help-symbols dt{font-family:Georgia,serif;font-weight:700;font-size:15px;color:#164c50}.help-symbols dd{margin:6px 0 0;font-size:12px;line-height:1.75}.help-example{padding:17px 19px;margin:18px 0;border:1px solid #c9b9a7;border-radius:10px;background:#fff9ed}.help-example summary{font-size:14px;font-weight:700;cursor:pointer;line-height:1.7}.help-example-prompt{font-size:15px;font-weight:600;line-height:1.8}.help-example ol,.help-roadmap ol{padding-left:26px;font-size:14px;line-height:1.95}.help-example li,.help-roadmap li{padding:5px 0 5px 4px;overflow-wrap:anywhere;white-space:pre-wrap}.help-example-takeaway{padding-top:12px;border-top:1px solid #dccbb9;font-size:13px;line-height:1.8}.help-roadmap{margin:24px 0}.help-pitfalls{border-left:3px solid #e7a55c;padding:12px 17px;background:#fff6e8;border-radius:0 7px 7px 0}.help-pitfalls ul{padding-left:19px;font-size:13px;line-height:1.8;margin:0}.help-current{padding:20px;border:1px solid #91bdb7;border-left:4px solid #2b8f91;border-radius:10px;background:#f4faf7;margin:19px 0}.help-current h4{font-size:16px;line-height:1.8;margin:8px 0 16px}.help-current p{font-size:13px;line-height:1.85}.help-previous{padding:11px 13px;background:#e8f2e5;border-radius:7px;margin:14px 0}.help-previous>b{font-size:11px}.help-previous p{margin:5px 0}.help-substitution-label{margin-bottom:5px}.help-substitution{padding:12px 15px;border:1px dashed #a0b8b1;border-radius:7px;background:#fff}.help-step-pitfall{margin-bottom:0;color:#775033}.help-givens dl{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}.help-givens dl>div{padding:12px 14px;border:1px solid #d6d6cc;border-radius:8px;background:#fff}.help-givens dt{font-weight:700;font-size:13px}.help-givens dd{margin:6px 0 0;line-height:1.8;font-size:14px}.help-example summary:focus-visible{outline:3px solid #168497;outline-offset:4px}#help-teaching-visual:empty{display:none}.hint-tier-one .help-first-action{margin-bottom:3px}.question-help-controls{display:flex;justify-content:flex-end;margin-bottom:8px}.question-help-controls button{font-size:11px}.question-help-source-answer{padding:15px 0}.question-help-source-answer svg{max-width:100%;height:auto}.question-source-answer-label{font-size:11px;color:var(--muted);line-height:1.8}
@media(max-width:640px){.help-symbols,.help-givens dl{grid-template-columns:1fr}.help-current,.help-rule,.help-example{padding:15px}.help-equation,.help-substitution{font-size:18px}.help-introduction{font-size:14px}}

.help-reference{margin:24px 0 6px;padding:14px 18px;border:1px solid #b9c9c1;border-radius:10px;background:#fffdf6}.help-reference>summary{font-size:13px;font-weight:700;line-height:1.8;cursor:pointer}.help-reference>summary:focus-visible{outline:3px solid #168497;outline-offset:4px}.help-reference[open]>summary{padding-bottom:10px;border-bottom:1px solid #d8dfd4}.help-reference .help-lesson{margin-bottom:0}
.help-example-visible{margin-top:12px;border-color:#b8c7bc;border-left:4px solid #e96658}.help-example-visible>h3{margin:10px 0 12px}.help-example-bridge{padding:15px 17px;border-radius:8px;background:#eaf3ed;font-size:14px;line-height:1.85}.help-example-bridge b{display:block}.help-example-diagram{margin:20px 0;border:1px solid #d5ded3;border-radius:9px;overflow:hidden;background:#fffdf5}.help-example-diagram svg{display:block;width:100%;height:auto}.help-example-diagram figcaption{padding:12px 16px;border-top:1px solid #d5ded3;font-size:12px;line-height:1.8}.help-solution-steps{list-style:none;padding:0;counter-reset:solution-step}.help-solution-steps>li{counter-increment:solution-step;margin:15px 0;padding:18px 20px;border:1px solid #bdd0c5;border-radius:10px;background:#f7fbf5}.help-solution-steps>li>h4{font-size:15px;line-height:1.8;margin:0 0 14px}.help-solution-steps>li>h4:before{content:counter(solution-step) ". ";color:#168184}.help-solution-steps>li>p{font-size:14px;line-height:1.9;margin-bottom:0}.help-solution-calculation{font-family:Georgia,serif;font-size:19px;line-height:1.9;white-space:pre-wrap;overflow-wrap:anywhere;padding:12px 14px;border-left:3px solid #e96658;background:#fff9ed;margin-top:10px}.help-original-steps{margin-top:18px;font-size:13px;line-height:1.9}.help-original-steps summary{cursor:pointer;font-weight:600}.help-step-action{color:#47655d}.help-current .help-step-action{font-size:14px}.help-original-steps summary:focus-visible{outline:3px solid #168497;outline-offset:4px}
@media(max-width:640px){.help-solution-steps>li{padding:15px}.help-solution-calculation{font-size:17px}}