body{margin:0}button,input:not([type=checkbox]):not([type=radio]):not([type=range]),select,textarea{border-radius:var(--radius-sm)}img,video,.cover,.book-cover{border-radius:var(--radius-sm)}.language-options,.reader-tools,.shelf-note,.format-note,.formula,.worked,.tips{border-radius:var(--radius-md)}footer[data-catasterize-business-host] .cat-business-info{--business-paper:var(--bg,var(--paper));--business-ink:var(--ink)}
@font-face{font-family:Fraunces;font-style:normal;font-weight:600;font-display:swap;src:url(/fonts/fraunces-latin-600.woff2) format("woff2")}
:root{font-family:'AldusStudy',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}*{box-sizing:border-box}html{scroll-behavior:auto;scroll-padding-top:90px}body{margin:0}a{color:inherit;text-underline-offset:5px}a:hover{color:var(--accent)}button,input,select,summary{font:inherit;border-radius:var(--radius-sm)}button,a,summary{touch-action:manipulation;border-radius:var(--radius-sm)}a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid var(--accent);outline-offset:4px;border-radius:var(--radius-sm)}::selection{background:var(--ink);color:var(--paper);border-radius:var(--radius-sm)}button{cursor:pointer;border-radius:var(--radius-sm)}.skip{position:fixed;top:-100px;left:16px;background:var(--ink);color:var(--paper);padding:12px;z-index:20}.skip:focus{top:10px}.bookbar{padding:22px max(24px,calc((100vw - 1240px)/2));display:flex;justify-content:space-between;align-items:center;gap:20px;border-bottom:1px solid var(--line);background:var(--paper)}.brand{font-family:Fraunces,Georgia,serif;font-size:27px;font-weight:600;text-decoration:none}.bookbar nav{display:flex;align-items:center;gap:24px}.bookbar nav>a,.language-control summary{min-height:44px;display:flex;align-items:center}.language-control{position:relative}.language-control summary{cursor:pointer;list-style:none}.language-control summary:after{content:'⌄';margin-left:8px}.language-control>div{position:absolute;right:0;top:48px;z-index:5;background:var(--paper);border:1px solid var(--line);min-width:150px;padding:8px;box-shadow:0 8px 24px #0002}.language-control a{display:block;padding:12px}main{max-width:1160px;margin:0 auto;padding:40px 30px 80px}h1,h2,h3{font-weight:700;line-height:1.3;letter-spacing:-.025em;overflow-wrap:break-word;text-wrap:balance;word-break:keep-all}h1{font-size:clamp(30px,3.5vw,40px);margin:0 0 22px;line-height:1.3}h2{font-size:26px;margin:0 0 16px}h3{font-size:21px;margin:28px 0 14px}p,li{font-size:17px;line-height:1.75;word-break:keep-all;overflow-wrap:anywhere}p{margin:0 0 18px}.book-intro{display:grid;grid-template-columns:1.5fr 1fr;gap:70px;align-items:center;margin:0 0 55px}.book-intro p{max-width:38em}.book-cover{background:var(--ink);color:var(--paper);padding:34px 28px;min-height:320px;display:flex;flex-direction:column;justify-content:space-between;border-bottom:12px solid var(--accent)}.book-cover span{font-size:22px}.book-cover strong{font-size:clamp(30px,4vw,45px);line-height:1.3}.book-cover small{font-size:15px;line-height:1.8}.download{display:inline-flex;align-items:center;min-height:48px;background:var(--ink);color:var(--paper);padding:12px 22px;text-decoration:none;margin:12px 0;border-radius:var(--radius-sm)}.download:hover{color:var(--paper);background:var(--accent)}.reader-tools{display:flex;align-items:center;flex-wrap:wrap;gap:12px;background:var(--soft);padding:20px;margin:0 0 35px;border-radius:var(--radius-sm)}.reader-tools label{font-size:15px;font-weight:700;border-radius:var(--radius-sm)}.reader-tools input{min-width:180px;flex:1;max-width:450px;padding:12px;border:1px solid var(--line);border-radius:var(--radius-sm)}.reader-tools button{min-height:46px;padding:9px 16px;border:0;background:var(--ink);color:var(--paper);border-radius:var(--radius-sm)}.reader-tools p{flex-basis:100%;margin:0;font-size:15px;border-radius:var(--radius-sm)}.reader-tools a{padding:8px;border-radius:var(--radius-sm)}.contents{display:flex;gap:6px 20px;flex-wrap:wrap;align-items:center;margin-bottom:24px}.contents h2{font-size:19px;margin:0 12px 0 0}.contents a{display:inline-flex;align-items:center;min-height:44px;font-size:16px}.chapter{padding:35px 0 50px}.chapter+.chapter{border-top:2px solid var(--ink)}.concept{max-width:72ch}.formula{background:var(--soft);padding:15px 20px;font-size:19px;border-radius:var(--radius-sm)}.chapter figure{margin:25px 0 38px;max-width:640px;background:var(--soft);padding:20px;border-radius:var(--radius-sm)}.chapter figure img{width:100%;display:block;border-radius:var(--radius-sm)}.chapter figcaption{font-size:14px;line-height:1.6;margin-top:12px}.worked{background:var(--soft);padding:25px;margin:28px 0 35px;max-width:78ch;border-radius:var(--radius-sm)}.worked h3,.tips h3{margin-top:0;border-radius:var(--radius-sm)}.worked small{font-size:12px;overflow-wrap:anywhere;border-radius:var(--radius-sm)}.worked ol{padding-left:22px;border-radius:var(--radius-sm)}.worked li{margin:10px 0;border-radius:var(--radius-sm)}.tips{padding:24px;background:var(--soft);margin:20px 0 32px;max-width:76ch;border-radius:var(--radius-sm)}.problems{display:grid;grid-template-columns:1fr 1fr;gap:0 65px}.problem{padding:24px 0 12px;min-width:0;break-inside:avoid;scroll-margin-top:20px}.number{display:flex;justify-content:space-between;margin-bottom:12px}.number strong{font-size:20px}.number span{font-size:15px}.stem{white-space:pre-line}.choices{list-style:none;counter-reset:choice;padding:0;margin:8px 0}.choices li{counter-increment:choice;display:flex;gap:10px;font-size:16px;margin:7px 0}.choices li:before{content:counter(choice);font-size:13px;min-width:22px;height:22px;line-height:22px;text-align:center;border:1px solid var(--ink);border-radius:50%;margin-top:4px;flex-shrink:0}.item-id{font-size:11px;line-height:1.5;color:var(--muted);overflow-wrap:anywhere;display:block;margin-top:15px}.writing-space{height:45px}.exam-heading{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:20px 0;border-top:2px solid var(--ink);border-bottom:2px solid var(--ink);margin:35px 0 12px}.exam-heading strong{font-size:27px}.exam-heading span{font-size:15px}.format-note{font-size:16px;background:var(--soft);padding:22px;border-radius:var(--radius-sm)}.backmatter{border-top:3px solid var(--ink);padding:45px 0;margin-top:45px}.key-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.key-grid p{font-size:16px}.key-grid a{display:block;font-size:11px;overflow-wrap:anywhere;word-break:break-word;line-height:1.7}.solution{margin-bottom:40px;max-width:78ch}.solution h3{font-size:18px}.solution>a{display:block;font-size:12px;overflow-wrap:anywhere;margin-bottom:12px}.solution p{white-space:pre-line;font-size:16px}.problem:target{background:#fff1ef;outline:2px solid var(--accent);outline-offset:10px}footer{border-top:1px solid var(--line);padding:35px max(24px,calc((100vw - 1100px)/2));font-size:14px}footer p{font-size:14px}footer a{display:inline-flex;align-items:center;min-height:44px;margin-right:24px}.shelf-intro{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:48px;align-items:start;margin-bottom:32px}.shelf-intro figure{margin:0;background:var(--soft);padding:16px;border-radius:var(--radius-md)}.shelf-intro img{display:block;width:100%;height:auto;max-height:300px;object-fit:contain}.shelf-intro figcaption{font-size:13px;line-height:1.6;margin-top:12px;word-break:keep-all;overflow-wrap:break-word;}.filter-bar{display:flex;flex-wrap:wrap;gap:16px;background:var(--soft);padding:20px;margin-bottom:16px;border-radius:var(--radius-md)}.filter-bar label{display:flex;flex-direction:column;gap:8px;font-size:15px;border-radius:var(--radius-sm)}.filter-bar select{min-width:175px;min-height:44px;background:var(--paper);border:1px solid var(--line);padding:9px 32px 9px 12px;border-radius:var(--radius-sm)}.subject-section{margin:36px 0 48px}.subject-section>p{max-width:62ch}.edition-group{display:grid;grid-template-columns:180px 1fr;gap:25px;padding:30px 0;border-top:1px solid var(--line);border-radius:var(--radius-sm)}.edition-group h3{font-size:22px;margin:0;border-radius:var(--radius-sm)}.edition-pair{display:grid;grid-template-columns:1fr 1fr;gap:24px;border-radius:var(--radius-sm)}.edition{background:var(--soft);padding:20px;min-width:0;border-radius:var(--radius-sm)}.edition h4{font-size:20px;margin:0 0 15px;border-radius:var(--radius-sm)}.edition p{font-size:15px;line-height:1.8;margin-bottom:12px;border-radius:var(--radius-sm)}.edition a{min-height:44px;display:flex;align-items:center;font-size:16px;width:fit-content;border-radius:var(--radius-sm)}.edition small{font-size:13px;color:var(--muted);border-radius:var(--radius-sm)}[hidden]{display:none}.no-results{font-size:17px}.print-sheet{overflow:visible}.shelf-note{max-width:75ch;background:var(--soft);padding:25px;border-radius:var(--radius-sm)}.shelf-note h2{font-size:23px;border-radius:var(--radius-sm)}
@media(max-width:850px){.book-intro{gap:30px}.bookbar{padding:18px 24px}.key-grid{grid-template-columns:1fr 1fr}.edition-group{grid-template-columns:140px 1fr;border-radius:var(--radius-sm)}.edition-pair{grid-template-columns:1fr;border-radius:var(--radius-sm)}.shelf-intro{gap:48px;grid-template-columns:minmax(0,1fr) 300px;margin-bottom:32px}.problems{gap:0 38px}.brand{font-size:23px}}
@media(max-width:600px){main{padding:28px 20px 64px}.bookbar{padding:12px 22px;gap:10px}.bookbar nav{gap:18px}.brand{font-size:20px}.bookbar nav>a,.language-control summary{font-size:14px}.book-intro,.shelf-intro{grid-template-columns:1fr;gap:25px}.book-cover{min-height:235px;padding:25px}.book-intro{margin-bottom:32px}.book-cover strong{font-size:34px}.reader-tools{padding:17px;gap:10px;border-radius:var(--radius-sm)}.reader-tools input{width:100%;max-width:100%;min-width:0;flex-basis:100%;font-size:16px;border-radius:var(--radius-sm)}.reader-tools button{width:100%;border-radius:var(--radius-sm)}.reader-tools label{font-size:16px;border-radius:var(--radius-sm)}.problems{grid-template-columns:1fr}.problem{padding-top:20px}.chapter{padding:30px 0 35px}.key-grid{grid-template-columns:1fr 1fr;gap:20px 14px}.exam-heading{align-items:flex-start;flex-direction:column}.exam-heading strong{font-size:25px}p,li{font-size:16px;line-height:1.75}.worked,.tips{padding:20px;border-radius:var(--radius-sm)}.worked li{font-size:16px;border-radius:var(--radius-sm)}.chapter figure{padding:10px;border-radius:var(--radius-sm)}h2{font-size:24px;margin:0 0 16px}h3{font-size:21px}.edition-group{grid-template-columns:1fr;gap:18px;border-radius:var(--radius-sm)}.edition-pair{grid-template-columns:1fr;gap:12px;border-radius:var(--radius-sm)}.edition{padding:20px;border-radius:var(--radius-sm)}.edition h4{font-size:19px;border-radius:var(--radius-sm)}.edition a{font-size:15px;border-radius:var(--radius-sm)}.edition p{font-size:14px;border-radius:var(--radius-sm)}.filter-bar{gap:8px;padding:12px;margin-bottom:16px;border-radius:var(--radius-md);display:grid;grid-template-columns:repeat(3,minmax(0,1fr))}.filter-bar label{width:100%;font-size:13px;border-radius:var(--radius-sm)}.filter-bar select{width:100%;min-width:0;border-radius:var(--radius-sm);font-size:14px;padding:8px 4px}.shelf-intro figure{padding:16px;border-radius:var(--radius-md);display:grid;grid-template-columns:88px minmax(0,1fr);gap:16px;align-items:center}.shelf-note{padding:20px;border-radius:var(--radius-sm)}.contents{gap:3px 16px;margin-bottom:24px}.contents a{font-size:15px}.item-id{font-size:11px}}
@media print{.bookbar,.reader-tools,.contents,footer,.book-intro .download{display:none}main{max-width:none;padding:28px 20px 64px}.book-intro{break-after:page}.chapter,.backmatter{break-before:page}.problem{break-inside:avoid}.problems{display:block;columns:2}.book-cover{background:var(--paper);color:black}.format-note{font-size:10pt;border-radius:var(--radius-sm)}@page{size:A4;margin:16mm}}

.print-sheet{padding:36px 0;border-top:1px solid var(--line);margin-top:35px}.print-sheet h2{font-size:24px}.print-sheet h3{font-size:20px}.print-sheet figure{max-width:620px;margin:25px 0;border-radius:var(--radius-sm)}.print-sheet figure img{width:100%;border-radius:var(--radius-sm)}.sheet-columns.two{display:grid;grid-template-columns:1fr 1fr;gap:60px}.sheet-columns>div{min-width:0}.sheet-copy{white-space:pre-line;max-width:76ch}.sheet-page{font-size:13px;text-align:right;color:var(--muted)}.key-entry{font-size:15px;white-space:pre-line;overflow-wrap:anywhere}.answer-sheet{display:grid;grid-template-columns:1fr 1fr;gap:0 28px}.answer-sheet p{font-variant-numeric:tabular-nums;font-size:16px}.sheet-columns .solution p{font-size:16px}.sheet-columns .item-id{font-size:11px}.print-sheet .solution a{font-size:12px}@media(max-width:600px){.sheet-columns.two{grid-template-columns:1fr;gap:0}.answer-sheet{grid-template-columns:1fr}.print-sheet{padding:25px 0}.print-sheet h2{font-size:23px}}

.reader-pagination{position:sticky;top:0;z-index:3;background:var(--paper);padding:14px 12px;display:grid;grid-template-columns:auto minmax(120px,1fr) auto auto auto;align-items:center;gap:12px;border-block:1px solid var(--line);margin-bottom:28px}.reader-pagination select{width:100%;min-height:44px;padding:8px;border:1px solid var(--line);background:var(--paper);font-size:16px;border-radius:var(--radius-sm)}.reader-pagination button{min-width:54px;min-height:44px;background:var(--ink);color:var(--paper);border:0;padding:10px;border-radius:var(--radius-sm)}.reader-pagination button:disabled{background:var(--soft);color:var(--muted);cursor:default;border-radius:var(--radius-sm)}.reader-pagination span{font-size:14px;white-space:nowrap}.reader-pagination label{font-size:14px;white-space:nowrap}@media(max-width:600px){.reader-pagination{grid-template-columns:1fr 1fr 1fr;gap:8px;padding:10px 0}.reader-pagination label{grid-column:1/-1}.reader-pagination select{grid-column:1/-1;border-radius:var(--radius-sm)}.reader-pagination span{text-align:center}}

sup,sub{font-size:.78em;line-height:0}.math-matrix{display:inline-flex;vertical-align:middle;align-items:center;position:relative;padding:.15em .35em;margin:.25em .2em;line-height:1.4;white-space:nowrap}.math-matrix:before,.math-matrix:after{content:"";position:absolute;top:0;bottom:0;width:5px;border-top:1px solid currentColor;border-bottom:1px solid currentColor}.math-matrix:before{left:0;border-left:1px solid currentColor}.math-matrix:after{right:0;border-right:1px solid currentColor}.matrix-values{display:grid;grid-template-columns:repeat(var(--columns),minmax(1.4em,auto));gap:.18em .7em;padding:0 .4em;font-variant-numeric:tabular-nums}.matrix-values>span{display:block;text-align:center;white-space:nowrap}.reader-pagination select{min-width:0;border-radius:var(--radius-sm)}

@media(max-width:600px){.problem,.chapter,.print-sheet,#key,#solutions{scroll-margin-top:90px}}
@media(max-width:600px){.shelf-intro img{height:124px}}@media(max-width:600px){.shelf-intro figcaption{margin:0;word-break:keep-all;overflow-wrap:break-word;}}
[hidden][hidden]{display:none}.print-sheet,.exam-sheet{--ink:#161616;--paper:#fff;--soft:#f1f1ed;--muted:#555;--line:#c6c6c0;background:#fff;color:#161616;border-radius:0}
body{margin:0}button,input:not([type=checkbox]):not([type=radio]):not([type=range]),select,textarea{border-radius:var(--radius-sm)}img,video,.cover,.book-cover{border-radius:var(--radius-sm)}.language-options,.reader-tools,.shelf-note,.format-note,.formula,.worked,.tips{border-radius:var(--radius-md)}footer[data-catasterize-business-host] .cat-business-info{--business-paper:var(--bg,var(--paper));--business-ink:var(--ink)}button,summary):focus-visible{outline:3px solid var(--accent,#c9302c);outline-offset:3px;border-radius:var(--radius-sm)}
.aldus-page-context{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;padding:12px clamp(16px,4vw,64px);border-bottom:1px solid var(--line,var(--ink));font-size:13px}
@media print{.aldus-page-context{display:none}}

[hidden][hidden]{display:none}


.cover-image{display:block;width:100%;height:auto;aspect-ratio:2/3;object-fit:contain;padding:0;border:0;border-radius:12px}
.series-cover img{display:block;width:100%;height:auto;aspect-ratio:2/3;border-radius:12px}
.synopsis{padding:20px;background:var(--surface);border-radius:12px;margin:24px 0}
.episodes{padding:24px;background:var(--surface);border-radius:12px}
.next-cover{float:left;width:64px;height:96px;object-fit:contain;margin:0 18px 10px 0;border-radius:12px}
.device-library li>a{display:grid;grid-template-columns:48px minmax(0,1fr);column-gap:12px;align-items:center}
.device-library li>a .library-cover{grid-column:1;grid-row:1/5;width:48px;height:72px;object-fit:contain;border-radius:8px}
.search-row:has(>.search-cover){grid-template-columns:64px minmax(0,1fr) auto}
.search-cover{width:64px;height:96px;object-fit:contain;border-radius:8px}
.search-row:has(>.search-cover)>div{min-width:0}
#silmo-math{padding:24px;background:var(--surface,var(--soft));border-radius:12px}
.download,.exam-actions a,.exam-actions button,.paper-actions a,.r06-controls button{border-radius:999px}
@media(max-width:650px){.episodes{padding:20px 16px}.search-row:has(>.search-cover){grid-template-columns:52px minmax(0,1fr)}.search-cover{width:52px;height:78px}.search-row:has(>.search-cover)>.search-links{grid-column:2}}

.unit-series{padding-block:64px;border-bottom:1px solid var(--line);margin-bottom:48px}
.unit-series-heading{display:flex;justify-content:space-between;align-items:flex-start;gap:24px;margin-bottom:32px}
.unit-series-heading h2{font-size:clamp(28px,3vw,34px);margin:0 0 12px}
.unit-series-heading p{color:var(--muted);max-width:40em;margin:0}
.unit-series-heading>a{flex:none;min-height:44px;display:inline-flex;align-items:center;font-size:15px}
.unit-shelf{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:40px 24px}
.unit-book{min-width:0}
.unit-book a{display:block;text-decoration:none}
.unit-book img{display:block;width:100%;height:auto;aspect-ratio:2/3;object-fit:contain;border-radius:12px;background:var(--soft)}
.unit-book h3{font-size:18px;margin:16px 0 8px;line-height:1.45;text-wrap:pretty}
.unit-book p{font-size:14px;line-height:1.6;color:var(--muted);margin:0 0 4px}
.unit-book .unit-sample-link{display:inline-flex;align-items:center;min-height:44px;font-size:14px;text-decoration:underline}
.unit-back{display:inline-flex;align-items:center;min-height:44px;font-size:15px;margin-bottom:24px}
.unit-hero{display:grid;grid-template-columns:280px minmax(0,1fr);gap:64px;align-items:start;margin:0 0 48px}
.unit-cover{display:block;width:100%;height:auto;aspect-ratio:2/3;border-radius:12px;object-fit:contain;background:var(--soft)}
.unit-hero h1{font-size:clamp(30px,3.3vw,44px);margin:0 0 16px;line-height:1.3;text-wrap:balance}
.unit-course{color:var(--muted);font-size:16px;margin-bottom:20px}
.unit-description{max-width:38em;margin-bottom:20px}
.unit-actions{display:flex;flex-wrap:wrap;align-items:center;gap:8px 24px;margin-block:12px}
.unit-actions .download{margin:0}
.unit-actions>a:not(.download){display:inline-flex;align-items:center;min-height:48px}
.unit-note{font-size:14px;color:var(--muted);line-height:1.65;margin:16px 0 0}
.unit-facts{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:24px;margin:0 0 64px;padding:24px 0;border-block:1px solid var(--line)}
.unit-facts>div{min-width:0}.unit-facts dt{font-size:14px;color:var(--muted);margin-bottom:8px}.unit-facts dd{font-size:19px;font-weight:600;margin:0;line-height:1.5;word-break:keep-all}
.unit-details{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:64px;margin-bottom:64px}
.unit-details h2,.unit-preview h2,.unit-related h2{font-size:28px}
.unit-details ul{padding-left:22px;margin:0}.unit-details li{margin:8px 0;font-size:16px}
.unit-standard{color:var(--muted);font-size:14px;line-height:1.7}
.unit-preview{margin-bottom:64px;scroll-margin-top:24px}
.unit-preview>p{color:var(--muted)}
.unit-preview-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px}
.unit-preview figure{margin:0;min-width:0}
.unit-preview a{display:block}
.unit-preview img{display:block;width:100%;height:auto;aspect-ratio:595/842;border-radius:0;background:white;border:1px solid var(--line)}
.unit-preview figcaption{font-size:14px;line-height:1.5;margin:12px 0 0}
.unit-contact{padding:24px 0;border-block:1px solid var(--line);font-size:15px;margin-bottom:64px}
.unit-contact a{overflow-wrap:anywhere}
.unit-related{margin-bottom:48px}.unit-related .unit-shelf{grid-template-columns:repeat(4,minmax(0,1fr))}
@media(hover:hover){.unit-book a:hover h3{color:var(--accent)}.unit-preview a:hover img{outline:2px solid var(--accent);outline-offset:3px}}
@media(max-width:950px){.unit-shelf,.unit-related .unit-shelf{grid-template-columns:repeat(3,minmax(0,1fr))}.unit-hero{grid-template-columns:230px minmax(0,1fr);gap:40px}.unit-details{gap:40px}.unit-facts{gap:20px}.unit-preview-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:600px){.unit-series{padding-block:48px}.unit-series-heading{display:block;margin-bottom:24px}.unit-series-heading>a{margin-top:12px}.unit-shelf,.unit-related .unit-shelf{grid-template-columns:repeat(2,minmax(0,1fr));gap:28px 20px}.unit-book h3{font-size:17px}.unit-hero{display:flex;flex-direction:column;gap:24px;margin-bottom:32px}.unit-cover{width:168px}.unit-hero h1{font-size:30px}.unit-course{margin-bottom:16px}.unit-description{font-size:16px}.unit-facts{grid-template-columns:repeat(2,minmax(0,1fr));margin-bottom:48px;gap:24px}.unit-facts dd{font-size:18px}.unit-details{grid-template-columns:1fr;gap:24px;margin-bottom:48px}.unit-preview-grid{gap:24px 16px}.unit-back{margin-bottom:20px}.unit-contact{margin-bottom:48px}.unit-actions{gap:8px 20px}}

.unit-series-jump{display:inline-flex;align-items:center;min-height:48px;margin-left:20px;font-size:15px}

/* Shared Aldus chassis. Incumbent palette; Apple spacing and control geometry. */
:root{color-scheme:light;--bg:#fff8e7;--paper:#fff8e7;--ink:#181713;--muted:#625d50;--line:#d1c9b7;--surface:#f4eddd;--soft:#f4eddd;--accent:#a42421;--radius-sm:11px;--radius-md:16px;--radius-lg:18px;--radius-pill:999px;background:var(--paper);color:var(--ink)}
@media(prefers-color-scheme:dark){:root:not([data-theme=light]):not([data-theme=sepia]){color-scheme:dark;--bg:#111210;--paper:#111210;--ink:#f1ecdf;--muted:#b8b4a8;--line:#45473f;--surface:#20221c;--soft:#20221c;--accent:#f38c86}}
:root[data-theme=dark]{color-scheme:dark;--bg:#111210;--paper:#111210;--ink:#f1ecdf;--muted:#b8b4a8;--line:#45473f;--surface:#20221c;--soft:#20221c;--accent:#f38c86}
html body{background:var(--paper);color:var(--ink);margin:0;font-family:'Apple SD Gothic Neo','Malgun Gothic',-apple-system,system-ui,sans-serif}
*,*::before,*::after{box-sizing:border-box}::selection{background:var(--ink);color:var(--paper)}html{scrollbar-color:var(--muted) var(--surface)}input,textarea{caret-color:var(--accent)}
a,button,summary,input,select,textarea{touch-action:manipulation}a,button,summary{min-width:44px;min-height:44px}a{border-radius:8px}a:not(.catalog-cover):not(.aldus-wordmark){text-underline-offset:4px}a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--accent);outline-offset:3px}
button,input:not([type=checkbox]):not([type=radio]):not([type=range]),select,textarea{font:inherit;color:var(--ink);background:var(--paper);border:1px solid var(--line);border-radius:11px;min-height:44px;padding:10px 12px;max-width:100%}button{cursor:pointer}button:active{transform:scale(.97)}button:disabled{cursor:default;opacity:.55}select{padding-inline-end:28px}input[type=checkbox],input[type=radio]{accent-color:var(--accent)}label:has(>input[type=checkbox]),label:has(>input[type=radio]){min-height:44px;display:flex;align-items:center;gap:10px}input[type=range]{min-height:44px;min-width:44px;accent-color:var(--accent)}summary{cursor:pointer;align-content:center}img{max-width:100%}[hidden]{display:none}
.site-header{position:relative;z-index:40;display:flex;align-items:center;gap:24px;width:100%;max-width:none;min-height:80px;padding:16px max(24px,calc((100% - 1200px)/2));margin:0;border-bottom:1px solid var(--line);background:var(--paper);color:var(--ink);font:14px/1.4 -apple-system,system-ui,sans-serif}
.site-header a{display:inline-flex;align-items:center;color:inherit;text-decoration:none;white-space:nowrap}.site-header a:hover{text-decoration:underline}.site-header .aldus-wordmark{flex:none;font:600 26px/1.2 Fraunces,Georgia,serif;letter-spacing:-.025em;margin:0}.site-links{display:flex;align-items:center;gap:20px}.site-search{display:flex;align-items:center;gap:6px;margin-left:auto;min-width:0;max-width:250px}.site-search input{width:170px;min-width:0;background:var(--surface);border-color:transparent;font-size:14px}.site-search button{background:transparent;border:0;padding:8px;min-width:44px}.site-header svg{display:block;fill:none;stroke:currentColor;stroke-width:1.7;width:20px;height:20px}.site-menu{position:relative;margin:0;padding:0;border:0;flex:none}.site-menu>summary{display:flex;align-items:center;justify-content:center;gap:8px;list-style:none;padding:10px 12px;border:1px solid var(--line);border-radius:11px;background:transparent}.site-menu>summary::-webkit-details-marker{display:none}.site-menu-panel{position:absolute;right:0;top:calc(100% + 12px);width:320px;max-width:calc(100vw - 32px);padding:20px;background:var(--paper);border:1px solid var(--line);border-radius:16px;box-shadow:0 10px 30px #0002}.site-menu-links{display:grid;grid-template-columns:1fr 1fr;gap:4px 16px}.site-menu-links a{white-space:normal}.site-menu .site-mobile-links,.site-menu .site-search{display:none}.site-menu-utilities{display:flex;align-items:center;gap:16px;border-top:1px solid var(--line);padding-top:16px;margin-top:16px}.site-theme{display:flex;align-items:center;justify-content:center;gap:8px;flex:1}.site-language{position:relative;margin:0}.site-language>summary{display:flex;align-items:center;gap:8px;list-style:none;padding:10px 12px;border:1px solid var(--line);border-radius:11px}.site-language>summary::-webkit-details-marker{display:none}.site-language-options{display:grid;padding:8px 0}.site-language-options a{padding:4px 10px}.site-language a[aria-current]{text-decoration:underline;font-weight:600}.site-menu .site-language[open]{align-self:start}
.site-header>.site-utilities{display:flex;align-items:center;gap:8px}.site-utilities .site-theme span{display:none}.site-utilities .site-theme{border:0;background:transparent;padding:10px}.site-utilities .site-language>summary{border:0;padding:10px 6px}.site-utilities .site-language-options{position:absolute;right:0;top:calc(100% + 8px);min-width:140px;background:var(--paper);border:1px solid var(--line);border-radius:11px;padding:8px;z-index:4}.site-menu .site-menu-utilities{display:none}
.site-header+main{min-width:0}.cat-business-info{--business-paper:var(--paper);--business-ink:var(--ink)}.catalog-shell,.shelf,main.shelf{max-width:1248px}main{min-width:0}h1,h2,h3,p{overflow-wrap:break-word}main>h1,.catalog-intro h1,.shelf-intro h1{letter-spacing:-.03em;line-height:1.2}.catalog-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:32px 24px}.catalog-cover{border-radius:11px;overflow:hidden}.catalog-cover img{width:100%;height:100%;object-fit:cover}.catalog-description{line-height:1.6}.catalog-card h3 a{display:flex;align-items:center;white-space:normal}.catalog-card-copy{min-width:0}.catalog-filters{background:transparent}.catalog-categories button{border-radius:999px}.catalog-intro{margin-bottom:32px}.catalog-meta{color:var(--muted)}
/* Study shelves retain all original links and filtering attributes. */
.study-subjects{margin-block:32px}.study-subject{border-top:1px solid var(--line);padding:8px 0 24px;margin:0}.study-subject>summary{display:flex;justify-content:space-between;gap:16px;padding:16px 0;font-size:24px;font-weight:650;list-style:none}.study-subject>summary::after{content:'+';font-size:24px;font-weight:400}.study-subject[open]>summary::after{content:'−'}.study-subject>summary small{font-size:14px;color:var(--muted);font-weight:400;margin-left:auto}.study-subject>summary::-webkit-details-marker{display:none}.study-subject .subject-section{margin:0;padding:0;background:transparent;border:0}.study-subject .subject-section>h2{display:none}.study-subject .edition-group{display:contents}.study-subject .edition-group>div:first-child{display:none}.study-subject .edition-pair{display:contents}.study-cover-grid{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:24px}.study-subject .edition{background:transparent;padding:0;min-width:0;display:flex;flex-direction:column}.study-cover{display:block;width:100%;aspect-ratio:2/3;margin-bottom:12px}.study-cover img{width:100%;height:100%;display:block;object-fit:cover;border-radius:11px}.study-subject .edition h4{font-size:16px;line-height:1.5;margin:0 0 4px}.study-subject .edition p{font-size:13px;line-height:1.6;margin:0 0 8px;color:var(--muted)}.study-subject .edition a{font-size:14px;max-width:100%;width:auto;min-height:44px}.study-subject .edition a:not(.study-cover){display:flex;align-items:center}.study-subject .edition small{font-size:12px;margin-top:4px;color:var(--muted)}.study-subjects+.unit-series{margin-top:48px}.filter-bar{background:var(--surface);border-radius:16px}.shelf-intro figure{background:var(--surface)}.book-intro,.unit-hero{background:transparent}.unit-card,.unit-facts{border-radius:16px}
/* Home keeps one reading invitation, while optional tools remain one tap away. */
.home-extras{border-block:1px solid var(--line);margin:48px 0;padding:8px 0}.home-extras>summary{font-size:18px;font-weight:600;padding:12px 0}.home-extras .score-welcome{border:0;margin-top:16px}.home-extras .covers-r05{margin-top:24px}.home-extras .score-welcome>h2{font-size:22px}.r06-title{font-size:40px;line-height:1.2}.r06-lead{font-size:17px;line-height:1.6;max-width:60ch}.r06-ranking{margin-block:40px}.r06-filters{gap:8px}.r06-filters button{border-radius:999px}.r06-carousel{border-radius:18px}.shelf-nav a,footer a{min-height:44px;display:inline-flex;align-items:center}.r06-ranking a{max-width:100%}.site-header form label,.site-sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
@media(max-width:1200px){.site-header{gap:16px}.site-links{gap:12px}.site-search{max-width:210px}.site-search input{width:130px}.site-header>.site-utilities{gap:0}.catalog-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.study-cover-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:1000px){.site-header{padding:12px 24px;min-height:72px;gap:20px}.site-header>.site-search{display:none}.site-links{margin-left:auto}.site-menu .site-search{display:flex;margin:0 0 16px;max-width:none}.site-menu .site-search input{width:100%;flex:1}}
@media(max-width:767px){.site-header{padding:10px 20px;min-height:68px;gap:12px;justify-content:space-between}.site-header .aldus-wordmark{font-size:25px}.site-header>.site-links,.site-header>.site-search,.site-header>.site-utilities{display:none}.site-menu>summary{padding:10px 12px;font-size:14px}.site-menu-panel{top:calc(100% + 12px);right:0;width:350px;max-width:calc(100vw - 40px);padding:20px}.site-menu .site-mobile-links{display:grid;grid-template-columns:1fr 1fr;gap:4px 16px;padding-bottom:12px;margin-bottom:12px;border-bottom:1px solid var(--line)}.site-menu .site-menu-utilities{display:flex}.site-menu a{font-size:15px}.site-menu .site-search input{font-size:16px}.catalog-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:28px 16px}.catalog-card h3{font-size:17px}.catalog-description{font-size:14px}.catalog-intro{display:block;margin-bottom:24px}.catalog-intro>a{display:inline-flex;align-items:center}.catalog-intro h1{font-size:30px}.catalog-layout{gap:24px}.study-cover-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:28px 16px}.shelf-intro{margin-bottom:24px}.shelf-intro h1{font-size:32px}.shelf-intro p{font-size:16px;line-height:1.7}.shelf-intro figure{display:none}.shelf-intro figure.study-preview{display:grid}.study-preview-details{margin-block:8px 24px}.study-preview-details summary{font-size:14px;color:var(--muted)}.study-subject>summary{font-size:22px}.study-subjects{margin:24px 0}.unit-series{margin-block:32px}.filter-bar{gap:10px;padding:12px}.filter-bar label{font-size:13px}.filter-bar select{font-size:14px;padding-left:10px}.r06-title{font-size:28px;margin-bottom:8px}.r06-lead{font-size:16px;margin-bottom:20px}.r06-carousel{border-radius:16px}.r06-ranking{margin-block:32px}.home-extras{margin-block:32px}.home-extras .score-welcome>h2{font-size:20px}.site-header+main{margin-top:24px}.r06-filters{flex-wrap:nowrap;overflow-x:auto;padding-bottom:6px;max-width:100%;gap:8px}.r06-filters button{flex:none}.book-intro h1{font-size:30px}.unit-hero h1{font-size:34px}}
@media print{.site-header{display:none}.study-subject .subject-section{display:block}}
/* Refinement from the first rendered review. */
.r06-carousel{background:#181713;color:#fff8e7}.r06-carousel button{background:transparent;color:#fff8e7;border-color:#fff8e7}.r06-carousel a{background:#fff8e7;color:#181713}.r06-carousel .r06-slide{min-height:380px}.r06-carousel img{max-height:340px;width:auto}.site-header a{min-height:44px}.shelf-intro h1{margin:0 0 12px}.shelf-intro p{margin:0 0 16px;line-height:1.6}.shelf-intro{gap:24px;margin-bottom:24px}.shelf-intro .study-preview-details{align-self:start;margin:0}.study-preview-details>summary{display:flex;align-items:center;padding:8px 0}.study-guide{margin-bottom:16px}.study-guide>summary{font-size:14px}.study-guide>div{padding:8px 0}.study-guide h3{font-size:16px;margin:0}.study-guide p{font-size:14px}.study-cover-grid{margin-top:8px}.study-subject .subject-section>p{font-size:14px;margin:0 0 12px;line-height:1.6}.catalog-intro p{margin-bottom:0}.catalog-intro>a{display:inline-flex;align-items:center}.catalog-query{margin-bottom:8px}.catalog-categories{margin:0 0 16px}.catalog-results>p{margin:0 0 16px}.catalog-group>h2{margin:0 0 20px}.catalog-grid{margin-top:0}.site-header .site-search input{border-radius:11px}.site-menu-panel{max-height:calc(100dvh - 100px);overflow:auto}
@media(max-width:767px){.r06-carousel .r06-slide{min-height:228px}.r06-carousel img{max-height:190px}.shelf-intro{display:block;margin-bottom:16px}.shelf-intro h1{font-size:30px;margin:0 0 8px}.shelf-intro p{font-size:16px;line-height:1.6;margin:0 0 12px}.shelf-intro .download{margin-top:8px}.shelf-intro .study-preview-details{margin:8px 0 0}.filter-bar{margin-top:16px;margin-bottom:12px}.study-subject>summary{padding:12px 0}.study-subjects{margin-top:16px}.study-subject .subject-section>p{display:none}.study-guide{margin-bottom:8px}.study-guide>summary{font-size:13px;min-height:44px}.catalog-shell{padding-top:20px}.catalog-intro{margin-bottom:16px}.catalog-intro h1{margin:0 0 8px}.catalog-intro p{font-size:15px;line-height:1.6;margin:0 0 4px}.catalog-intro>a{font-size:14px}.catalog-query{gap:8px;margin:0 0 8px}.catalog-query label{font-size:13px}.catalog-categories{margin:8px 0 12px;gap:8px}.catalog-filter-wrap>summary{font-size:14px}.catalog-layout{gap:12px}.catalog-results>p{font-size:14px;margin:0 0 16px}.catalog-group>h2{font-size:22px;margin:0 0 16px}.catalog-card h3{margin-top:8px}.site-header+main{margin-top:20px}}

body select,body .filter-bar select{appearance:none;height:44px;border-radius:11px;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23736b5c' stroke-width='1.7'%3E%3Cpath d='m7 10 5 5 5-5'/%3E%3C/svg%3E");background-size:18px;background-repeat:no-repeat;background-position:right 8px center;padding-right:30px}body a:not([class]),body a[class=""]{min-height:44px;min-width:44px;max-width:100%}body a:where(:not([class]),[class=""]){display:inline-flex;align-items:center}

.site-header .site-theme{color:var(--ink)}.study-preview-details>summary::after{content:"";display:block;width:7px;height:7px;border-right:1px solid currentColor;border-bottom:1px solid currentColor;transform:rotate(-45deg);margin:0 10px}.study-preview-details[open]>summary::after{transform:rotate(45deg)}.study-subject .edition p{min-height:44px}.catalog-card-copy h3{min-height:48px}.r06-ranking{margin-top:32px}
@media(min-width:1024px){.site-links{font-size:15px}.r06-slide p{font-size:16px;line-height:1.6}}
@media(max-width:767px){.catalog-intro{margin-bottom:12px}.catalog-intro p{margin-bottom:0}.catalog-query{margin-top:0}.catalog-intro h1{font-size:28px}.catalog-group>h2{margin-bottom:12px}}

body .unit-related a,body .unit-preview a{display:block;min-width:0}footer .cat-business-info{--business-paper:var(--paper);--business-ink:var(--ink)}.study-subject .edition h4{min-height:48px}.unit-contact a{overflow-wrap:anywhere;word-break:break-word}

:root[data-theme=sepia]{--paper:var(--bg)}html body [hidden]{display:none}