/* Book-like series introduction and a three-level reading tree. */
.series-book{position:relative;isolation:isolate;display:flex;align-items:center;gap:30px;min-height:300px;padding:28px;margin-bottom:28px;background:#f7f9fd;border:1px solid #e2e8f1;border-radius:13px;overflow:hidden}
.series-book .heading-art{opacity:.1;mask-image:none;-webkit-mask-image:none}
.series-book-cover{position:relative;flex:0 0 180px;width:180px;height:240px;overflow:hidden;border-radius:3px 8px 8px 3px;background:#1c4382;box-shadow:5px 8px 20px #20396625,1px 0 0 #143467}
.series-book-cover::after{content:'';pointer-events:none;position:absolute;inset:0;background:linear-gradient(90deg,#09244936 0,transparent 7%,#ffffff24 8%,transparent 11%);z-index:2;border:1px solid #ffffff18;border-radius:inherit}
.series-book-cover>img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;display:block}
.series-book-fallback{height:100%;display:flex;flex-direction:column;justify-content:center;gap:18px;padding:24px 20px 22px 25px;color:#f5f8ff;background:linear-gradient(145deg,#285ba4,#193b76);overflow-wrap:anywhere}
.series-book-fallback>span{font-size:10px;letter-spacing:4px;color:#b6cbed}.series-book-fallback strong{font-size:22px;font-weight:500;line-height:1.6}.series-book-fallback small{font-size:9px;line-height:1.5;color:#b2c5e4;margin-top:auto}
.series-book-copy{flex:1;min-width:0}.series-book--right .series-book-cover{order:2}.series-book--right .series-book-copy{order:1}
.series-book-eyebrow{display:inline-flex;align-items:center;gap:7px;color:#5c7fac;font-size:11px;letter-spacing:2px;margin-bottom:10px}.series-book-eyebrow svg{width:14px;height:14px}
.nuliblog-showcase .series-book h1{font-size:30px!important;font-weight:600!important;line-height:1.4!important;color:#233c5f!important;text-align:left!important;border:0!important;padding:0!important;margin:0!important;overflow-wrap:anywhere}
.series-book-subtitle{font-size:15px;color:#6981a2;line-height:1.6;margin:9px 0 0}.series-book-summary{font-size:13px;color:#77869b;line-height:1.85;margin:12px 0 0;display:-webkit-box;-webkit-line-clamp:4;-webkit-box-orient:vertical;overflow:hidden}
.series-book-meta{display:flex;gap:8px 20px;flex-wrap:wrap;margin:15px 0 0}.series-book-meta>div{display:flex;gap:7px;align-items:baseline;min-width:0}.series-book-meta dt{font-size:10px;font-weight:400;color:#a1adbe;flex:none}.series-book-meta dd{font-size:12px;color:#687e9d;margin:0;overflow-wrap:anywhere}.series-book-audience{flex-basis:100%}
.series-stat{display:flex;gap:6px 15px;flex-wrap:wrap;margin-top:13px;font-size:10px;color:#99a6b9;font-variant-numeric:tabular-nums}
.series-book-actions{display:flex;gap:9px;flex-wrap:wrap;margin-top:17px}.series-book-actions .showcase-button{font-size:12px;padding:7px 12px}
.series-book [hidden],.series-catalogue [hidden]{display:none!important}
.series-catalogue{margin:28px 0 30px;scroll-margin-top:80px}
.series-catalogue-title{display:flex;align-items:center;gap:12px;margin-bottom:14px;flex-wrap:wrap}
.nuliblog-showcase .series-catalogue-title h2{font-size:20px!important;margin:0!important;padding:0!important;border:0!important;color:#273d60}
.series-catalogue-title>span{font-size:10px;color:#a0aaba}.series-tree-actions{display:flex;gap:7px;margin-left:auto}
.series-tree-actions button,.series-excerpt-toggle{font:inherit;font-size:10px;border:0;background:transparent;color:#90a0b8;padding:3px 6px;cursor:pointer;white-space:nowrap}
.series-tree-actions button:hover,.series-excerpt-toggle:hover{color:#2563eb;background:#f1f5fd;border-radius:4px}
.series-tree{padding:12px 18px!important;margin:0!important;list-style:none;border:1px solid #e1e7f0;border-radius:10px;background:white}
.series-tree-node{position:relative;list-style:none;margin:0!important;padding:0!important;min-width:0}
.series-tree-children{list-style:none;margin:0 0 0 10px!important;padding:0 0 0 24px!important}
.series-tree-children>.series-tree-node::before{content:'';position:absolute;left:-24px;top:0;bottom:0;width:1px;background:#dce5f1}
.series-tree-children>.series-tree-node:last-child::before{height:21px;bottom:auto}
.series-tree-children>.series-tree-node::after{content:'';position:absolute;left:-24px;top:21px;width:24px;height:1px;background:#dce5f1}
.series-tree-row{display:flex;gap:8px;align-items:flex-start;min-height:42px;padding:9px 0;min-width:0}
.series-tree-toggle,.series-tree-spacer{display:inline-flex;align-items:center;justify-content:center;flex:none;box-sizing:border-box;width:20px;height:24px;padding:0;border:0;background:transparent;color:#8fa7ca;cursor:pointer}.series-tree-spacer{cursor:default}
.series-tree-toggle svg{width:13px;height:13px;transition:transform .15s}.series-tree-toggle[aria-expanded=true] svg{transform:rotate(90deg)}
.series-tree-toggle:hover{color:#2563eb;background:#edf3ff;border-radius:4px}
.series-tree-number{flex:none;line-height:24px;font-size:11px;color:#9babc0;font-variant-numeric:tabular-nums}
.series-tree-title{flex:1;min-width:0;font-size:14px;line-height:24px;color:#526b8f;text-decoration:none!important;overflow-wrap:anywhere}
.series-tree-title:hover{color:#2563eb}.series-tree-node[data-series-depth="1"]>.series-tree-row>.series-tree-title{font-size:16px;font-weight:600;color:#235aa7}
.series-tree-node[data-series-depth="2"]>.series-tree-row>.series-tree-title{font-weight:500;color:#5778a4}
.series-tree-row>time{flex:none;font-size:10px;color:#a8b3c2;line-height:24px}.series-excerpt-toggle{line-height:20px;flex:none;margin-top:1px}
.series-node-excerpt{margin:0 0 10px 35px;padding:8px 11px;font-size:12px;line-height:1.75;color:#8b99ae;background:#f8fafd;border-left:2px solid #e1e9f5;overflow-wrap:anywhere}
.series-empty{padding:20px;background:#f7f9fd;border:1px dashed #dce4f0;border-radius:9px;color:#8b96a8;font-size:13px}
.series-tree button:focus-visible,.series-tree-actions button:focus-visible{outline:2px solid #2563eb;outline-offset:2px}
.series-membership{padding:17px 19px;margin:26px 0;border:1px solid #dce5f3;border-radius:10px;background:#f8faff;font-size:13px}
.series-membership-head{display:flex;align-items:center;gap:16px;justify-content:space-between}.series-membership-head>div{min-width:0;flex:1}.series-membership-head small{display:block;font-size:10px;color:#8f9db1;margin-bottom:5px}.series-membership-head a{color:#2563eb;text-decoration:none;overflow-wrap:anywhere}.series-membership-head>div>a{display:block;font-size:14px;font-weight:500}.series-return{font-size:11px;flex:none}
.series-neighbors{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}.series-neighbors:has(a){margin-top:14px;padding-top:12px;border-top:1px dashed #dce5f3}.series-neighbors a{color:#4e6d9b;min-width:0;text-decoration:none}.series-neighbors small{font-size:10px;color:#99a6b9;display:block;margin-bottom:4px}.series-neighbors span{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:12px}.series-neighbors .is-next{grid-column:2;text-align:right}

@media(max-width:767px){
.series-book{flex-direction:column;align-items:flex-start;padding:20px;gap:20px;min-height:0}
.series-book .series-book-cover{order:0;flex:none;width:112px;height:150px;align-self:center}.series-book .series-book-copy{order:1;width:100%}
.series-book-fallback{padding:14px 12px 12px 17px;gap:9px}.series-book-fallback>span{font-size:8px;letter-spacing:2px}.series-book-fallback strong{font-size:16px}.series-book-fallback small{font-size:7px}
.nuliblog-showcase .series-book h1{font-size:24px!important}.series-book-summary{-webkit-line-clamp:3}.series-book-subtitle{font-size:13px}.series-book-meta{gap:7px 15px}.series-book-meta dd{font-size:11px}
.series-catalogue{margin:22px 0}.series-catalogue-title{gap:8px}.series-tree-actions{gap:2px}.series-tree-actions button{padding:3px 4px}
.series-tree{padding:9px 10px!important}.series-tree-children{margin-left:9px!important;padding-left:14px!important}.series-tree-children>.series-tree-node::before{left:-14px}.series-tree-children>.series-tree-node::after{left:-14px;width:14px}
.series-tree-row{gap:5px}.series-tree-title{font-size:13px}.series-tree-node[data-series-depth="1"]>.series-tree-row>.series-tree-title{font-size:15px}.series-tree-number{font-size:10px}.series-tree-row>time{display:none}.series-excerpt-toggle{padding:3px;font-size:9px}
.series-node-excerpt{margin-left:24px;font-size:11px}.series-membership{padding:14px;margin:22px 0}.series-membership-head{align-items:flex-start;gap:10px;flex-wrap:wrap}.series-return{margin-left:auto}.series-neighbors{gap:12px}
}
@media(prefers-reduced-motion:reduce){.series-tree-toggle svg{transition:none}}