:root{--ink:#22282d;--muted:#58636c;--paper:#f4f1ea;--red:#b34231;--line:#dad6ce;--c:#eaf1f3;--o:#f1eedf;--m:#f5e8e3}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Hiragino Kaku Gothic ProN","Yu Gothic",sans-serif;line-height:1.7}a{color:#8b3023;text-underline-offset:4px}button{font:inherit;cursor:pointer;background:white;color:var(--ink);border:1px solid var(--line);border-radius:7px;padding:7px 14px}button:focus-visible,a:focus-visible,summary:focus-visible,textarea:focus-visible{outline:3px solid var(--red);outline-offset:3px}button:disabled{opacity:.35;cursor:default}.toolbar{position:sticky;top:0;z-index:20;background:#f4f1eaf5;border-bottom:1px solid var(--line);padding:10px 4vw;display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}.brand{font-size:13px;letter-spacing:.08em}.controls{display:flex;gap:8px;align-items:center}.controls span{font-size:13px;color:var(--muted)}#mode[aria-pressed=true]{background:var(--ink);color:white}header,main,footer{max-width:1120px;margin:auto;padding:30px 28px}header{padding-top:52px}.eyebrow,.num{font-size:12px;font-weight:700;letter-spacing:.13em;color:var(--red)}h1{font-size:clamp(30px,4.4vw,52px);line-height:1.3;letter-spacing:-.02em;margin:12px 0 20px}header p{color:var(--muted);max-width:740px}nav{display:flex;gap:8px;flex-wrap:wrap;margin-top:22px}nav a{background:white;padding:5px 12px;border:1px solid var(--line);border-radius:20px;text-decoration:none;font-size:13px}.scene{background:white;border:1px solid var(--line);border-radius:16px;margin-bottom:28px;padding:32px;scroll-margin-top:90px}h2{font-size:clamp(24px,3vw,34px);line-height:1.4;margin:8px 0 14px}.takeaway{font-size:20px;font-weight:700;border-left:4px solid var(--red);padding:4px 0 4px 16px;margin:18px 0 24px}.diagram{border:1px solid var(--line);border-radius:12px;padding:24px;background:#fcfbf8;margin:20px 0}.diagram small{color:var(--muted)}.flow{display:flex;align-items:stretch;gap:12px;justify-content:center}.node{padding:20px;border:1px solid var(--line);border-radius:10px;background:white;flex:1;min-width:0}.node strong{display:block;font-size:20px}.arrow{align-self:center;font-size:26px;color:var(--red);flex-shrink:0}.accent{border:2px solid var(--red)}.caption{font-size:13px;color:var(--muted);margin-top:14px}.three{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}.c{background:var(--c)}.o{background:var(--o)}.m{background:var(--m)}.letter{font-size:36px;line-height:1;color:var(--muted);display:block;margin-bottom:12px}.target{border:2px solid var(--ink);text-align:center;padding:18px;border-radius:10px;max-width:620px;margin:20px auto 0}.links{text-align:center;font-size:14px;margin:16px 0;color:var(--muted)}.feedback{text-align:center;color:var(--red);font-weight:600;margin-top:12px}.support{margin:22px 0}.support p{margin:10px 0}.tag{font-size:12px;color:var(--muted);font-weight:600}.note{background:#f7f5f0;border-radius:8px;padding:14px 18px;font-size:14px}.note p{margin:5px 0}details{border-top:1px solid var(--line);margin-top:16px;padding-top:12px}summary{cursor:pointer;color:var(--muted);font-size:14px}.detail{padding:10px 0 0}.detail ol,.detail ul{padding-left:22px;font-size:14px}.table-wrap{overflow:auto}table{width:100%;border-collapse:collapse;font-size:14px}th,td{padding:13px 12px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}th{background:#f5f3ee}.check{display:grid;grid-template-columns:1fr 1fr;gap:16px}.check label{display:block;font-size:14px;font-weight:600}.check textarea{width:100%;min-height:85px;resize:vertical;border:1px solid var(--line);border-radius:7px;padding:10px;font:inherit;font-size:14px;margin-top:6px}.wide{grid-column:1/-1}footer{font-size:13px;color:var(--muted);padding-bottom:55px}footer p{max-width:850px}
@media(max-width:700px){header,main,footer{padding-left:16px;padding-right:16px}.scene{padding:22px 18px}.flow{flex-direction:column}.arrow{transform:rotate(90deg)}.three,.check{grid-template-columns:1fr}.wide{grid-column:auto}.diagram{padding:16px}.toolbar{padding:9px 16px}.brand{max-width:130px}.controls{flex-wrap:wrap}}
@media print{body{background:white}.toolbar,header nav,.speaker,.design{display:none!important}header,main,footer{padding:10px 0;max-width:none}h1{font-size:30px}h2{font-size:24px}.diagram{padding:15px}.three{grid-template-columns:repeat(3,1fr)}.flow{flex-direction:row}.arrow{transform:none}textarea{border:1px solid #aaa!important}a{color:inherit}}

.timeline{display:grid;grid-template-columns:repeat(5,1fr);gap:10px}.timeline .node{padding:16px 12px}.timeline strong{font-size:18px}.stepno{font-size:12px;color:var(--red);display:block;margin-bottom:8px}.branch{margin:16px 0 0 40%;padding:16px;border-left:4px solid var(--red);background:var(--m)}.choice{display:grid;grid-template-columns:1fr 1fr;gap:16px}.badge{display:inline-block;padding:3px 9px;border:1px solid var(--line);border-radius:20px;font-size:12px;color:var(--muted);margin-right:6px}.source-note{font-size:13px;color:var(--muted)}
@media(max-width:700px){.timeline,.choice{grid-template-columns:1fr}.branch{margin-left:0}}
@media print{.worksheet{display:block!important}.timeline{grid-template-columns:repeat(5,1fr)}}

.chapter-title{font-size:clamp(25px,3vw,34px);font-weight:700;line-height:1.45;color:var(--ink);letter-spacing:0;margin:0 0 14px}.chapter-message{font-size:19px;line-height:1.6;color:var(--muted);font-weight:600;margin:0 0 18px}.scene{scroll-margin-top:24px}header{padding-top:40px}
@media print{.chapter-title{font-size:24px}.chapter-message{font-size:17px}}

.chapter-nav{display:flex;flex-wrap:wrap;gap:12px;margin:0 0 24px;font-size:14px}.chapter-nav a{padding:6px 10px;background:white;border:1px solid var(--line);border-radius:6px;text-decoration:none}.chapter-page header{padding-bottom:0}.chapter-page main{padding-top:24px}.chapter-page .scene{margin-bottom:0}.chapter-list{list-style:none;padding:0}.chapter-list li{margin:12px 0}.chapter-list a{display:block;padding:20px 24px;border:1px solid var(--line);border-radius:10px;background:white;text-decoration:none;font-size:20px;font-weight:600}@media print{.chapter-nav{display:none}}

/* Section titles lead; supporting messages remain subordinate. */
.chapter-page .axis-title{font-size:clamp(23px,2.5vw,29px);font-weight:700;line-height:1.5;letter-spacing:0;color:var(--ink);margin:0 0 10px}
.chapter-page .axis-message{font-size:18px;line-height:1.65;font-weight:500;color:var(--muted);margin:0 0 22px}
@media print{.chapter-page .axis-title{font-size:23px}.chapter-page .axis-message{font-size:17px}}

.chapter-page .chapter-axis{border-top:1px solid var(--line);padding-top:28px;margin-top:30px}

/* Persistent chapter navigation, matching the previous study-session layout. */
.has-sidebar{padding-left:280px}
.study-sidebar{position:fixed;inset:0 auto 0 0;width:280px;height:100vh;height:100dvh;overflow-y:auto;padding:28px 20px 24px;background:#efebe2;border-right:1px solid var(--line);z-index:30}
.study-brand{display:block;margin:0 8px 24px;text-decoration:none;color:var(--ink)}
.study-brand small{display:block;color:var(--red);font-size:12px;font-weight:700}
.study-brand strong{display:block;font-size:21px;line-height:1.45;margin-top:6px}
.study-toc{display:block;margin:0}
.study-toc ul{list-style:none;padding:0;margin:0}
.study-toc>ul{display:grid;gap:5px}
.study-toc a{display:grid;grid-template-columns:44px minmax(0,1fr);gap:8px;padding:10px 9px;border:0;border-left:3px solid transparent;border-radius:0;background:transparent;color:var(--ink);font-size:14px;line-height:1.5;text-decoration:none}
.study-toc a span{white-space:nowrap;color:var(--red);font-weight:700}
.study-toc a b{font-weight:500}
.study-toc a:hover,.study-toc a[aria-current="page"]{background:#fff;border-left-color:var(--red)}
.study-toc a[aria-current="page"] b{font-weight:700}
.study-toc .section-toc{margin:5px 0 12px 17px;padding-left:12px;border-left:1px solid var(--line)}
.study-toc .section-toc a{display:block;font-size:12px;color:var(--muted);padding:7px 8px}
.study-toc .section-toc a[aria-current="location"]{color:var(--red);background:#fff;border-left-color:var(--red)}
.study-skip{position:fixed;top:8px;left:8px;transform:translateY(-180%);padding:8px 12px;background:var(--ink);color:#fff;z-index:50}
.study-skip:focus{transform:none}
@media(max-width:900px){
 .has-sidebar{padding-left:0}
 .study-sidebar{position:sticky;top:0;inset-inline:0;width:100%;height:auto;overflow:visible;padding:10px 12px 0;border-right:0;border-bottom:1px solid var(--line)}
 .study-brand{margin:0 0 7px}
 .study-brand small{font-size:11px}
 .study-brand strong{font-size:15px;margin-top:0}
 .study-brand br{display:none}
 .study-toc{overflow-x:auto;overscroll-behavior-x:contain;padding-bottom:4px}
 .study-toc>ul{display:flex;gap:5px;width:max-content}
 .study-toc>ul>li{flex:0 0 164px;width:164px}
 .study-toc a{grid-template-columns:44px minmax(0,1fr);padding:7px 6px;border-left:0;border-bottom:3px solid transparent;font-size:12px;min-height:53px}
 .study-toc a:hover,.study-toc a[aria-current="page"]{border-left:0;border-bottom-color:var(--red)}
 .study-toc .section-toc{display:none}
 .has-sidebar{scroll-padding-top:145px}
 .has-sidebar .scene,.has-sidebar .chapter-axis,.has-sidebar .intro-axis,.has-sidebar footer{scroll-margin-top:150px}
 #main-content{scroll-margin-top:150px}
}
@media print{.has-sidebar{padding-left:0}.study-sidebar,.study-skip{display:none!important}}

.intervention-functions th:first-child{width:22%;min-width:7em}.intervention-functions td p{margin:0 0 10px}.intervention-functions td p:last-child{margin-bottom:0}.intervention-example{padding-top:8px;border-top:1px solid var(--line);color:var(--muted)}