.why-series{--series-ink:var(--ink,#233442);--series-muted:var(--muted,#657482);--series-line:var(--line,#d9e1e6);--series-paper:var(--paper,#fff);--series-blue:var(--accent,#316b88);color:var(--series-ink)}
.why-series *, .why-series *::before,.why-series *::after{box-sizing:border-box}.why-series :where(button,input){font:inherit;color:inherit}.why-series button{cursor:pointer}.why-series a{color:inherit}.series-heading{display:flex;align-items:end;justify-content:space-between;gap:20px;margin:12px 0 20px}.series-kicker{font-size:12px;letter-spacing:.12em;color:var(--series-blue)}.science-books-panel .series-heading h1{font-weight:500;margin:8px 0;font-size:22px}.science-books-panel .series-heading p{margin:0}.science-books-panel .series-production-count{font-size:12px;white-space:nowrap}.series-collections{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:6px 8px;margin-bottom:18px}.series-collection{display:flex;flex-direction:column;gap:0;min-height:0;min-width:0;border:1px solid transparent;padding:4px;background:transparent;text-align:left;border-radius:4px}.series-collection[aria-pressed=true]{border-color:var(--series-blue);color:var(--series-blue);background:var(--series-paper)}.series-collection-art{display:block;width:100%;aspect-ratio:1.95;background-color:#20394c;background-size:cover;background-position:center;border-radius:3px}.series-collection-copy{display:flex;flex-direction:row;align-items:center;flex-wrap:wrap;gap:4px 8px;padding-top:5px;min-width:0;width:100%}.series-collection strong{font-size:14px;font-weight:500;line-height:24px}.series-collection small{font-size:12px;line-height:18px;color:var(--series-muted)}.series-section-heading{display:flex;align-items:center;gap:14px;justify-content:space-between;margin:12px 0}.science-books-panel .series-section-heading h2{font-size:var(--ui-section-title-size,15px);font-weight:400;line-height:24px;margin:0}.science-books-panel .series-section-heading p{font-size:13px;margin:0;color:var(--series-muted)}.series-ready-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:20px 16px}.series-ready-book{position:relative;display:flex;flex-direction:column;min-width:0;background:var(--series-paper);text-decoration:none;overflow:hidden;border-radius:4px;border:1px solid var(--series-line)}.series-ready-book>img{display:block;width:100%;height:100%;object-fit:cover;background:#062a43}.series-ready-copy{position:absolute;inset:auto 0 0;display:flex;flex-direction:column;gap:3px;padding:36px 14px 12px;background:linear-gradient(transparent,#071c2be0 60%);color:#fff}.series-ready-copy>strong{font-size:18px;font-weight:500;line-height:27px;color:white;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:2;overflow:hidden}.series-ready-copy>small{font-size:12px;line-height:18px;color:#d0e1eb}.series-read-link{font-size:13px;line-height:22px;color:var(--series-blue);padding:5px 10px;border:1px solid var(--series-line);border-radius:4px;white-space:nowrap;background:var(--series-paper)}.series-text-button{border:0;border-radius:0;background:transparent;font-size:14px;padding:6px 0;border-bottom:1px solid currentColor;white-space:nowrap}.series-topics{margin-top:24px;border-top:1px solid var(--series-line);padding-top:4px}.series-search input{width:210px;max-width:100%;padding:7px 10px;border:1px solid var(--series-line);border-radius:4px;background:var(--series-paper);font-size:14px}.series-topic-list{list-style:none;margin:10px 0 0;padding:0;display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:0 14px}.series-topic-list li{display:grid;grid-template-columns:28px minmax(0,1fr);gap:2px 5px;padding:12px 0;border-top:1px solid var(--series-line);align-content:start}.series-topic-number{font:12px/22px Georgia,serif;color:var(--series-muted)}.series-topic-title{font-size:14px;line-height:22px}.series-topic-list small{grid-column:2;font-size:12px;line-height:18px;color:var(--series-muted)}.science-books-panel .series-topic-count{font-size:12px;color:var(--series-muted)}.science-books-panel .series-art-note{font-size:12px;line-height:1.8;margin-top:14px;color:var(--series-muted)}.series-empty{padding:20px 0;color:var(--series-muted);font-size:14px}.series-legacy{border-top:1px solid var(--series-line);margin-top:20px;padding-top:14px}.series-legacy summary{font-size:15px;line-height:24px;cursor:pointer}.series-legacy .science-book-grid{margin-top:16px}.series-legacy .science-book-cover-copy strong{font-size:15px;font-weight:500}.why-series :is(a,button,input,summary):focus-visible{outline:2px solid #528fb3;outline-offset:4px}body.dark .why-series{--series-ink:#e6edf3;--series-muted:#afc0d1;--series-line:#344c61;--series-paper:#152d43;--series-blue:#a2cce5}
@media(max-width:900px){.series-collections{grid-template-columns:repeat(4,minmax(0,1fr))}.series-topic-list{grid-template-columns:repeat(3,minmax(0,1fr))}.series-heading{align-items:start;flex-direction:column;gap:8px}.series-ready-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.series-section-heading{flex-wrap:wrap}}
@media(max-width:600px){.series-collections{grid-template-columns:repeat(3,minmax(0,1fr));gap:12px 8px}.series-collection small{font-size:12px}.series-ready-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.series-ready-copy{padding:38px 10px 10px}.series-topic-list{grid-template-columns:repeat(2,minmax(0,1fr))}.series-section-heading{align-items:start}.series-search{width:100%}.series-search input{width:100%}.series-production-count{white-space:normal!important}}

.why-preview .why-collection-preview{margin:14px 0 0;gap:12px}.children-why .why-collection-preview .series-collection{min-width:0;min-height:0;border:0;border-bottom:2px solid transparent;padding:0 0 6px;background:transparent;color:inherit;border-radius:0;box-shadow:none}.children-why .why-collection-preview .series-collection strong{font-size:var(--ui-section-title-size,15px);font-weight:400;line-height:24px}.children-why .why-collection-preview .series-collection small{font-size:12px;color:var(--series-muted)}

/* Search and recovery belong to the same stable bookshelf controls. */
.series-toolbar{display:flex;align-items:end;gap:16px;margin:0 0 14px}.series-toolbar .series-search{display:grid;gap:5px;flex:1;max-width:540px;font-size:13px}.series-toolbar input{width:100%;min-height:38px;border:1px solid var(--series-line);border-radius:4px;background:var(--series-paper);padding:7px 10px}.series-result-status{margin:0 0 8px;font-size:13px;color:var(--series-muted)}.series-toolbar>button{margin-bottom:3px}.series-empty{padding:24px 12px;text-align:center}.series-empty button{margin-top:10px}.series-plans{border:1px solid var(--series-line);border-radius:4px;margin-top:16px;padding:12px 14px;font-size:13px;background:var(--series-paper)}.series-plans>summary{cursor:pointer;min-height:28px}.series-plan-note{color:var(--series-muted);margin:8px 0}.series-plan-group h3{font-size:var(--sprout-type-section-title-size,15px);font-weight:var(--sprout-type-section-title-weight,400);margin:14px 0 6px}.series-collection:focus-visible,.series-ready-book:focus-visible,.series-text-button:focus-visible,.series-search input:focus-visible{outline:2px solid var(--series-blue);outline-offset:3px}@media(max-width:900px){.series-collections{grid-template-columns:repeat(3,minmax(0,1fr))}.series-toolbar{flex-wrap:wrap;gap:8px}.series-toolbar .series-search{flex:1 0 100%;max-width:none}.series-result-status{flex:1}}@media(max-width:480px){.series-collections{grid-template-columns:repeat(2,minmax(0,1fr))}}

.why-page{--ink:#233442;--paper:#fff;--surface:#fff;--line:#d9e1e6;--muted:#657482;--accent:#4962ed}.why-page.dark{--ink:#e5edf7;--paper:#142239;--surface:#142239;--line:#35506a;--muted:#adbed1;--accent:#a4baff}.series-back-to-children{display:inline-block;font-size:13px;line-height:24px;color:var(--ink);margin-bottom:4px}.why-page .micro-entry{margin-top:20px}

/* Approved Image composition: six wide category photos and distinct book footers. */
.why-page{background:#f7faff}.why-page.dark{background:#0c1729}.why-page .studio-workspace{max-width:1280px;padding-top:18px}.why-page .series-back-to-children{font-size:12px;margin:0 0 3px;color:var(--muted)}.series-heading{margin:8px 0 20px}.series-heading>div{width:100%}.science-books-panel .series-heading h1{font-size:28px;line-height:40px;font-weight:500;display:flex;align-items:center;gap:20px;margin:8px 0 4px}.series-heading .series-production-count{font-size:13px;font-weight:400;line-height:24px;letter-spacing:0;color:var(--series-muted)}.series-heading p{font-size:13px;line-height:23px;color:var(--series-muted)}.series-kicker{font-size:12px;letter-spacing:0}.series-collections{gap:12px 14px;margin:16px 0 24px}.series-collection[aria-pressed=true]{outline:1px solid var(--series-blue);outline-offset:0;border-color:var(--series-blue);background:var(--series-paper)}.series-collection:hover{background:var(--series-paper)}.series-collection-copy small{font-size:12px;line-height:22px}.series-search-box{display:flex;align-items:center;gap:9px;border:1px solid var(--series-line);border-radius:4px;background:var(--series-paper);padding:0 11px}.series-search-symbol{font-size:24px;line-height:28px;color:var(--series-muted)}.series-toolbar .series-search input{border:0;background:transparent;padding:8px 0;min-width:0;flex:1;outline-offset:0}.series-toolbar .series-search:focus-within .series-search-box{outline:2px solid var(--series-blue);outline-offset:2px}.series-toolbar .series-search input:focus-visible{outline:0}.series-toolbar .series-search{max-width:640px;font-size:13px;font-weight:500}.series-result-status{font-size:13px}.series-toolbar>button{margin-left:auto;font-size:13px}.series-cover-frame{position:relative;display:block;aspect-ratio:3/4;overflow:hidden;background:#12364e}.series-cover-frame>img{width:100%;height:100%;object-fit:cover;display:block}.series-cover-subtitle{font-size:14px;line-height:22px;color:#edf5fd}.series-ready-grid{gap:16px}.series-ready-grid.is-filtered{grid-template-columns:repeat(3,minmax(0,1fr))}.series-ready-grid.is-filtered .series-cover-frame{aspect-ratio:4/3}.series-ready-footer{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:10px 12px;background:var(--series-paper)}.series-book-meta{display:grid;gap:3px;min-width:0}.series-book-meta small{font-size:12px;line-height:18px;color:var(--series-muted)}.series-book-meta small+small{font-size:11px}.series-ready-book:hover{border-color:var(--series-blue)}.series-ready-book:hover .series-read-link{border-color:var(--series-blue)}.series-plans>summary{min-height:24px;list-style:none;display:flex;align-items:center;gap:12px;color:var(--series-ink)}.series-plans>summary:before{content:'▧';color:var(--series-blue);font-size:22px}.series-plans>summary:after{content:'⌄';margin-left:auto;color:var(--series-muted)}.series-plans[open]>summary:after{transform:rotate(180deg)}.series-art-note{font-size:11px!important;margin:9px 0!important}.why-page .micro-entry{min-height:74px;border-radius:4px;position:relative;overflow:hidden;background:#25442c;color:#fff;border:0;padding:0 16px;margin-top:14px}.why-page .micro-entry>img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;opacity:.4}.why-page .micro-entry .entry-copy,.why-page .micro-entry>span:last-child{position:relative;z-index:1}.why-page .micro-entry .entry-copy{margin:0}.why-page .micro-entry small{color:#edf5e8;font-size:12px}.why-page .micro-entry strong{font-size:15px}.why-page .micro-entry>span:last-child{margin-left:auto;padding:6px 12px;background:var(--paper);color:var(--ink);border-radius:4px;font-size:13px;white-space:nowrap}.science-order-entry{display:flex;align-items:center;justify-content:space-between;gap:16px;border-top:1px solid var(--series-line);padding-top:12px;margin:16px 0}.science-order-entry p{font-size:13px;color:var(--series-muted);margin:3px 0 0}.science-order-entry button{border:1px solid var(--series-line);border-radius:4px;background:var(--series-paper);color:var(--series-blue);padding:7px 12px;font:inherit;cursor:pointer;white-space:nowrap}
@media(max-width:900px){.science-books-panel .series-heading h1{flex-wrap:wrap;gap:4px 16px}.series-ready-grid.is-filtered{grid-template-columns:repeat(3,minmax(0,1fr))}.series-ready-footer{padding:8px;flex-wrap:wrap}.series-collections{grid-template-columns:repeat(3,minmax(0,1fr))}.series-ready-copy{padding:30px 9px 10px}.series-ready-copy>strong{font-size:16px}.series-cover-subtitle{font-size:13px}}
@media(max-width:600px){.series-ready-grid.is-filtered{grid-template-columns:repeat(2,minmax(0,1fr))}.series-cover-frame,.series-ready-grid.is-filtered .series-cover-frame{aspect-ratio:3/4}.series-collections{grid-template-columns:repeat(3,minmax(0,1fr))}.series-collection-copy{display:grid;gap:0}.series-collection strong{font-size:13px}.series-collection small{font-size:11px}.science-books-panel .series-heading h1{font-size:26px}.science-order-entry{align-items:start;flex-direction:column}.why-page .micro-entry>span:last-child{padding:5px 8px}}
/* Embedded child-room preview keeps its existing compact context. */
.why-preview .why-collection-preview .series-collection{display:grid;grid-template-columns:48px minmax(0,1fr);gap:8px}.why-preview .why-collection-preview .series-collection-art{width:48px;height:48px;aspect-ratio:1;background-size:400% 300%}.why-preview .why-collection-preview .series-collection-copy{display:flex;flex-direction:column;align-items:flex-start;gap:2px;padding:0}