.lesson-meta{display:flex;gap:9px;flex-wrap:wrap;margin-bottom:24px;color:var(--muted);font-size:12px}.lesson-meta span{background:#edf1e9;padding:4px 9px;border-radius:5px}.lesson-layout{display:grid;grid-template-columns:185px minmax(0,1fr);gap:25px}.lesson-outline{position:sticky;top:20px;align-self:start;display:grid;gap:5px;font-size:13px}.lesson-outline strong{padding:10px;color:var(--green)}.lesson-outline a{padding:12px 10px;min-height:44px;border-radius:7px}.lesson-outline a:hover{background:var(--mint)}.lesson-outline p{padding:16px 10px;border-top:1px solid var(--line);color:var(--muted);font-size:12px;line-height:1.9}.lesson-body{min-width:0}.lesson-section{padding:28px 30px;background:white;border:1px solid var(--line);border-radius:14px;margin-bottom:20px;scroll-margin-top:20px}.lesson-section h2{margin:8px 0 18px}.lesson-section p,.lesson-section li{font-size:15px;line-height:1.95;color:#43554b}.lesson-section ul{padding-left:22px}.lesson-concept{margin:24px 0}.lesson-concept h3{font-size:16px;margin-bottom:9px}.lesson-pitfall{padding:18px 21px;border-radius:10px;background:#f7f1e3}.lesson-pitfall strong{font-size:13px;color:#816332}.lesson-pitfall p{margin-top:5px}.example-question{font-weight:600}.example-steps{padding-left:22px}.example-steps li{padding:7px 0}.lesson-experiment{display:flex;align-items:center;justify-content:space-between;gap:22px;padding:26px 30px;border-radius:14px;background:#e8f0e5;margin-bottom:20px}.lesson-experiment h2{margin:8px 0}.lesson-experiment p{font-size:14px;color:var(--muted);line-height:1.8}.lesson-experiment .primary{white-space:nowrap}.practice-summary{font-size:12px!important;color:var(--muted)!important}.practice-form{border-top:1px solid var(--line);margin-top:24px;padding-top:24px}.practice-form fieldset{border:0;padding:0;margin:0 0 14px;min-width:0}.practice-form legend{font-weight:600;font-size:15px;margin-bottom:12px}.answer-option{display:flex;align-items:center;gap:10px;min-height:46px;padding:10px 13px;border:1px solid var(--line);border-radius:8px;margin:8px 0;cursor:pointer;font-size:14px}.answer-option:has(input:checked){background:var(--mint);border-color:var(--green)}.answer-option input{accent-color:var(--green);width:17px;height:17px;flex-shrink:0}.answer-feedback{min-height:24px;margin-top:13px!important;font-size:13px!important}.answer-feedback.correct{color:#23644f!important}.answer-feedback.incorrect{color:#8e5227!important}.source-section p{font-size:12px}.source-section a{color:var(--green);text-decoration:underline;text-underline-offset:3px}.source-section small{display:block;color:var(--muted);margin-top:5px}.related-lessons{display:flex;flex-wrap:wrap;gap:12px}.related-lessons a{padding:10px;border-radius:8px;background:var(--mint);font-size:13px;min-height:44px}.knowledge-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:14px}.knowledge-actions a{display:inline-flex;align-items:center;min-height:44px;padding:9px 12px;border-radius:7px;font-size:12px;background:var(--mint);color:var(--green)}.knowledge-actions a:first-child{background:var(--green);color:white}.lab-picker{display:flex;gap:15px;align-items:center;flex-wrap:wrap;width:100%}.lab-picker label{font-size:12px;color:var(--muted)}.lab-picker select{max-width:100%;min-height:44px;padding:9px 12px;border:1px solid var(--line);border-radius:8px;background:white;color:var(--ink);font:inherit}.lab-picker .text-button{margin-left:auto}.formula{white-space:normal;overflow-wrap:anywhere}.control-panel{min-width:0}.facts strong{overflow-wrap:anywhere}.board-caption{flex-wrap:wrap}#trial-status{font-size:12px;margin-top:12px;color:var(--green)}
@media(max-width:1000px){.lesson-layout{grid-template-columns:1fr}.lesson-outline{position:static;display:flex;align-items:center;gap:3px;flex-wrap:wrap}.lesson-outline p{width:100%;padding:10px;margin:0}.lesson-outline a{font-size:12px}.lesson-outline strong{width:100%}}
@media(max-width:580px){.lesson-section{padding:22px 18px}.lesson-section p,.lesson-section li{font-size:14px}.lesson-experiment{padding:22px 18px;display:block}.lesson-experiment .primary{margin-top:15px}.lab-picker{gap:8px}.lab-picker select{width:100%;font-size:13px}.lab-picker .text-button{margin-left:0}.lesson-meta{font-size:10px}}