.extension-main{max-width:1240px;margin:auto;padding:44px 24px}.extension-main h1{max-width:850px;font-size:clamp(2.1rem,4vw,3.8rem);line-height:1.1}.extension-main p,.extension-main li{line-height:1.8}.extension-main .lead{font-size:1.2rem;max-width:850px}.lesson-section{background:white;border:1px solid #dde5ea;border-radius:18px;padding:clamp(22px,4vw,44px);margin:28px 0;scroll-margin-top:90px}.lesson-section h2{font-size:1.9rem}.lesson-section h3{margin-top:28px}.lesson-section table,.airbnb-results table{width:100%;border-collapse:collapse;font-size:.94rem}.lesson-section td,.lesson-section th,.airbnb-results td,.airbnb-results th{padding:13px;text-align:left;border-bottom:1px solid #dce5eb;vertical-align:top}.table-wrap{overflow:auto}.table-wrap table{min-width:540px}.example-box{background:#edf5f4;border-left:4px solid #176f68;padding:22px;margin:24px 0;border-radius:6px}.lesson-section details{padding:16px;background:#f6f7f8;border-radius:8px;margin:16px 0}summary{cursor:pointer;font-weight:650}.airbnb-layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:32px;align-items:start;margin-top:32px}.airbnb-layout fieldset{min-width:0;border:1px solid #d8e2e9;background:white;border-radius:14px;padding:24px;margin:0 0 22px}.airbnb-layout legend{font-size:1.15rem;font-weight:700;padding:0 8px}.parameter-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.number-field{display:flex;flex-direction:column;gap:7px;font-size:.88rem;margin:8px 0}.number-field input,.number-field select{width:100%;box-sizing:border-box;border:1px solid #aebec9;border-radius:8px;padding:12px;font:inherit;background:white;color:#112d44}.number-field input:focus{outline:3px solid #b0d9d2}.unit-card{border-top:1px solid #dce5eb;margin-top:22px;padding-top:10px}.airbnb-results{position:sticky;top:24px;background:white;border:1px solid #d8e2e9;padding:24px;border-radius:18px}.result-focus{padding:24px;background:#112d44;color:white;border-radius:12px}.result-focus strong{display:block;font-size:2.8rem;color:#fff}.result-focus small{display:block;margin-top:8px}.metric-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:24px 0}.metric-grid strong{display:block;font-size:1.4rem}.airbnb-results svg{width:100%;height:auto}.airbnb-results svg text{font:12px sans-serif;fill:#29475c}#errors{color:#a93624}.course-topnav{flex-wrap:wrap}.source-note{font-size:.88rem;color:#50677a}.learning-shortcuts{flex-wrap:wrap}@media(max-width:900px){.airbnb-layout{grid-template-columns:1fr}.airbnb-results{position:static}.extension-main{padding:28px 16px}}@media(max-width:500px){.parameter-grid{grid-template-columns:1fr}.airbnb-results{padding:14px}.metric-grid{gap:12px}}