/* Optional research layer: compact entry, readable detail on demand. */
.lessons-page{max-width:1120px;padding-bottom:70px}.lesson-breadcrumb{font-size:13px;padding-top:28px;color:var(--muted)}.lesson-hero{padding:38px 0 30px;max-width:850px}.lesson-hero h1{font-size:clamp(40px,6vw,68px);line-height:1.06;letter-spacing:-1.8px;margin:15px 0 24px}.lesson-lead{font-size:19px;line-height:1.7;max-width:760px}.lesson-limit{border-left:3px solid var(--theme-border, #b4641d);padding:14px 20px;background:var(--theme-warm-surface, #f5ebd6);font-size:15px;line-height:1.7;margin:25px 0}.lesson-section{padding:44px 0;border-top:1px solid var(--line);scroll-margin-top:120px}.lesson-section>h2{font-size:clamp(29px,4vw,42px);line-height:1.16;margin:12px 0 22px}.lesson-section>p{max-width:850px;line-height:1.75}.lesson-takeaways{max-width:850px;margin:0 0 22px}.lesson-takeaways article{border-top:3px solid var(--theme-border, #0e6470);padding:26px 0;scroll-margin-top:120px}.lesson-number{font-size:13px;font-weight:700;letter-spacing:.08em;color:var(--theme-readable, #0e6470)}.lesson-takeaways h2{font-size:clamp(24px,3vw,30px);line-height:1.3;margin:10px 0 22px;max-width:28em}.lesson-takeaways p{font-size:16px;line-height:1.7;margin:16px 0}.lesson-takeaways p>strong{display:block;margin-bottom:5px}.lesson-paired-outcomes>span{display:block;margin-top:8px}.lesson-paired-outcomes a{font-weight:600}.lesson-takeaways .lesson-caveat{border-left:2px solid var(--theme-border, #b4641d);padding-left:16px;font-size:15px}.lesson-takeaways .source-note{font-size:13px}.lesson-implication strong span{font-weight:400;font-size:14px}.lesson-research-routes{display:flex;flex-wrap:wrap;gap:8px 28px;margin:0 0 28px}.lesson-research-routes a{display:inline-flex;align-items:center;min-height:44px;font-weight:600}.lesson-hero,.lesson-takeaways,.lesson-takeaways article,.lesson-next{min-width:0;overflow-wrap:anywhere}.lesson-implication{padding-top:16px;border-top:1px solid var(--line)}.lesson-next{background:var(--theme-soft, #edf2e9);padding:25px 30px;border-radius:12px}.lesson-next h3{font-size:23px;margin:0 0 12px}.lesson-next p{line-height:1.75}.lesson-next a{font-weight:600}.lesson-exhibit,.lesson-case,.lesson-claim,.lesson-method{border-top:1px solid var(--theme-border, #ccd7cb);scroll-margin-top:125px}.lessons-page summary{min-height:64px;padding:21px 8px;cursor:pointer;font-size:18px;line-height:1.5}.lesson-exhibit>summary{display:flex;gap:20px;align-items:flex-start}.lesson-exhibit>summary::after,.lesson-case>summary::after,.lesson-claim>summary::after{content:'+';font-size:24px;margin-left:auto;color:var(--theme-readable, #0e6470)}.lesson-exhibit[open]>summary::after,.lesson-case[open]>summary::after,.lesson-claim[open]>summary::after{content:'−'}.lesson-exhibit>summary,.lesson-case>summary,.lesson-claim>summary{list-style:none}.lesson-exhibit>summary::-webkit-details-marker,.lesson-case>summary::-webkit-details-marker,.lesson-claim>summary::-webkit-details-marker{display:none}.lesson-exhibit .lesson-number{padding-top:6px}.lesson-subtitle{display:block;font-weight:400;font-size:13px;color:var(--theme-readable, #53645c);line-height:1.65;margin-top:5px}.lesson-exhibit-body{padding:0 8px 28px}.lesson-exhibit figure{margin:0}.lesson-exhibit img{display:block;width:100%;height:auto;background:#fbfaf6;border:1px solid #dce3da;border-radius:8px}.lesson-exhibit figcaption{font-size:15px;line-height:1.7;margin:18px 0;max-width:870px}.lesson-downloads{display:flex;flex-wrap:wrap;gap:12px 25px;font-size:14px}.lesson-downloads a{min-height:44px;display:inline-flex;align-items:center}.lesson-data{background:var(--theme-soft, #edf2e9);padding:0 18px;border-radius:8px}.lesson-data>summary{font-size:15px;font-weight:600}.lesson-data[open]{padding-bottom:18px}.lesson-data p,.lesson-data li{font-size:14px;line-height:1.75}.lesson-data li{margin:10px 0}.lesson-table-wrap{overflow:auto;max-width:100%;margin:10px 0 20px;overscroll-behavior-x:contain}.lessons-page table{border-collapse:collapse;width:100%;font-size:13px;text-align:left}.lessons-page th,.lessons-page td{padding:12px;border-bottom:1px solid var(--theme-border, #ccd7cb);vertical-align:top;min-width:90px;line-height:1.55}.lessons-page th{font-weight:600}.lessons-page caption{text-align:left;font-weight:600;padding:10px 0;line-height:1.6}.lesson-filters{border:1px solid var(--theme-border, #ccd7cb);border-radius:10px;padding:20px;display:flex;align-items:end;gap:18px;margin:25px 0}.lesson-filters legend{font-size:14px;font-weight:700;padding:0 8px}.lesson-filters label{display:block;flex:1;font-size:13px;font-weight:600}.lesson-filters input,.lesson-filters select{display:block;width:100%;min-height:46px;margin-top:8px;border:1px solid var(--theme-border, #a4b8a9);border-radius:6px;background:var(--theme-surface, white);padding:10px;font:inherit;font-size:16px;color:var(--theme-strong, var(--green))}.lesson-filters button{min-height:46px;padding:10px 17px;border:1px solid var(--theme-border, #143936);background:var(--theme-surface, white);border-radius:6px;color:var(--theme-readable, #143936);font:inherit;cursor:pointer}.lesson-case>summary{display:flex;gap:18px;align-items:center}.lesson-case>summary>span:first-child{flex:1}.lesson-outcome{font-size:12px;color:var(--theme-readable, #0e6470);max-width:220px}.closure-case .lesson-outcome{color:var(--theme-warm-text, #914914)}.lesson-case-body{padding:0 8px 26px;max-width:850px}.lesson-case-body h3{font-size:22px;margin:12px 0}.lessons-page dt{font-weight:700;font-size:14px;margin:18px 0 6px}.lessons-page dd{margin:0;line-height:1.75;font-size:15px}.lesson-case li{margin:14px 0;line-height:1.75}.lesson-method[open]{padding-bottom:25px}.lesson-method h3{font-size:21px;margin:27px 0 12px}.lesson-method p,.lesson-method li{font-size:15px;line-height:1.8}.lesson-source{padding:28px 0;border-bottom:1px solid var(--line);scroll-margin-top:120px;max-width:870px}.lesson-source h3{font-size:22px;line-height:1.45;margin-bottom:12px}.lesson-full-url{display:block;overflow-wrap:anywhere;font-size:13px;line-height:1.75;margin:15px 0}.lesson-source-index{display:flex;gap:8px;flex-wrap:wrap;margin:25px 0}.lesson-source-index a{min-height:44px;min-width:50px;display:flex;align-items:center;justify-content:center;border:1px solid var(--theme-border, #ccd7cb);border-radius:6px;font-size:13px}.lesson-claim>summary{display:flex;gap:15px}.lesson-claim>div{padding:0 8px 22px;line-height:1.75}.lessons-page a:focus-visible,.lessons-page summary:focus-visible,.lessons-page input:focus-visible,.lessons-page select:focus-visible,.lessons-page button:focus-visible,.lesson-table-wrap:focus-visible{outline:3px solid var(--theme-focus, #a45012);outline-offset:4px}.lesson-preview{background:var(--theme-soft, #edf2e9);border:1px solid var(--theme-border, #ccd7cb);border-radius:14px;padding:28px;margin-top:28px}.lesson-preview h3{font-size:27px;line-height:1.25;margin:10px 0 14px}.lesson-preview p{line-height:1.75}.lesson-preview .button-row{margin-top:20px}.lessons-page [hidden]{display:none!important}
@media(max-width:760px){.lesson-hero{padding:25px 0}.lesson-hero h1{letter-spacing:-1px}.lesson-hero h1 br{display:none}.lesson-lead{font-size:17px}.lesson-takeaways{margin-top:0}.lesson-takeaways article{padding:22px 0}.lesson-section{padding:32px 0}.lesson-next{padding:22px}.lesson-filters{display:block}.lesson-filters label{margin-bottom:18px}.lesson-filters button{width:100%}.lesson-exhibit>summary{gap:12px}.lesson-case>summary{flex-wrap:wrap;gap:8px}.lesson-case>summary>span:first-child{flex-basis:75%}.lesson-case .lesson-outcome{order:3;max-width:none;flex-basis:100%}.lesson-exhibit-body{padding:0 0 22px}.lesson-data{padding:0 12px}.lesson-exhibit .lesson-subtitle{font-size:12px}.lesson-exhibit>summary strong{font-size:17px}.lesson-preview{padding:23px}.lesson-preview h3{font-size:25px}.lesson-preview .button-row{align-items:stretch;flex-direction:column}.lesson-downloads{gap:6px 20px}}
@media print{.lesson-filters,.lesson-downloads,.lesson-source-index{display:none!important}.lesson-exhibit,.lesson-case{break-inside:avoid}.lessons-page{max-width:none}.lesson-takeaways{display:block}}
/* Long research jumps must land before a visitor opens a graphic, case or source, including without scripts. */
html:has(.lessons-page){scroll-behavior:auto}

/* Put the first recorded finding directly after the short scope statement. */
.lesson-landing-hero{padding:24px 0 18px}.lesson-landing-hero h1{margin:10px 0 18px}#key-lessons{padding-top:0;border-top:0}.lesson-takeaways article:first-child{padding-top:18px}