:root{--paper:#f8f7f2;--ink:#233831;--green:#164c43;--muted:#61736b;--line:#dce3da;--sage:#e6eddf;--white:#fff;--accent:#dfb774;color-scheme:light;font-family:Arial,Helvetica,sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:30px}body{margin:0}a{color:inherit;text-decoration:none}button,input{font:inherit}button,a,input,summary{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:default;opacity:.35}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #b87a28;outline-offset:5px}button{color:inherit}p{line-height:1.65}h1,h2,h3,p{margin-top:0}h1,h2{font-family:Georgia,'Times New Roman',serif;font-weight:400;letter-spacing:-.045em}h2{font-size:42px;line-height:1.14;margin-bottom:0}h3{font-size:18px;line-height:1.4}button{background:none;border:0}.skip-link{position:fixed;left:16px;top:-80px;background:var(--green);color:white;padding:16px;z-index:10}.skip-link:focus{top:12px}.site-header{max-width:1320px;margin:auto;height:108px;padding:0 64px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:11px;font-size:20px;font-weight:700;letter-spacing:-.7px}.brand-mark{display:grid;place-items:center;background:var(--green);color:#fff;width:38px;height:40px;font:bold 34px Georgia,serif;border-radius:10px 10px 10px 2px;padding-bottom:5px}.brand-light{font-weight:400;margin-left:5px}.site-header nav{display:flex;gap:32px;font-size:13px}.site-header nav a{padding:12px 0}.nav-current{border-bottom:1px solid var(--green)}.hero{max-width:1320px;margin:auto;padding:72px 90px 68px 64px;display:grid;grid-template-columns:1.1fr 1fr;gap:50px;min-height:620px}.eyebrow{font-size:10px;font-weight:700;letter-spacing:2.1px;color:var(--green);margin-bottom:24px;display:flex;align-items:center;gap:8px}.eyebrow>span{width:6px;height:6px;border-radius:50%;background:var(--green)}h1{font-size:68px;line-height:1.04;margin:0 0 29px}h1 em{color:var(--green);font-weight:400}.hero-book{font-size:18px;font-weight:600;margin-bottom:8px}.hero-description{color:var(--muted);font-size:15px;max-width:370px;margin-bottom:25px}.button{display:inline-flex;align-items:center;gap:44px;padding:17px 22px;font-size:13px;font-weight:600;border-radius:4px}.primary{background:var(--green);color:white;transition:background .2s}.primary:hover{background:#236558}.button span{font-size:20px;line-height:1}.hero-note{font-size:11px;color:var(--muted);margin-top:19px;display:flex;align-items:center;gap:7px}.hero-note span{font-size:17px}.hero-art{position:relative;display:flex;justify-content:center;align-items:center;min-height:460px}.book-backdrop{position:absolute;width:410px;height:410px;max-width:100%;border-radius:50%;background:var(--sage);bottom:50px;right:-10px}.book-backdrop:after{content:'';position:absolute;inset:24px;border:1px solid #cad8c1;border-radius:50%}.book-cover{position:relative;z-index:1;width:274px;height:auto;box-shadow:-8px 8px 0 -3px #ecebe2,-10px 10px 0 -3px #c9ceca,10px 22px 35px #173b2926;transform:rotate(-6deg);border-radius:1px 3px 3px 1px}.math-note{position:absolute;color:#73866e;font-family:Georgia,serif;font-style:italic;font-size:21px;z-index:2}.note-one{right:0;top:6px;transform:rotate(8deg)}.note-two{right:-13px;bottom:1px;font-size:16px;transform:rotate(-5deg)}.edition-tag{position:absolute;z-index:3;right:-20px;bottom:70px;display:flex;align-items:center;gap:14px;background:#fffdf7;padding:17px 20px;box-shadow:0 7px 22px #203d2311;font-size:9px;letter-spacing:1.2px}.edition-tag small{display:block;letter-spacing:0;font-size:11px;margin-top:7px;color:var(--muted)}.tag-line{width:3px;height:30px;background:var(--accent)}.book-strip{background:var(--green);color:#fff;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:23px max(64px,calc((100vw - 1192px)/2));font-size:9px;letter-spacing:1.3px}.book-strip p{font-size:12px;letter-spacing:.2px;margin:0;color:#e8eee8}.book-strip b{font-weight:400;display:inline-block;margin:0 12px}.book-strip .edition{opacity:.65}.section-wrap{max-width:1320px;padding-left:64px;padding-right:64px;margin:auto}.chapter-section{padding-top:77px;padding-bottom:66px}.section-heading{display:flex;justify-content:space-between;gap:40px;align-items:end;margin-bottom:30px}.section-heading .eyebrow{margin-bottom:15px}.section-heading>p{font-size:13px;margin:0 0 3px;color:var(--muted)}.resource-notice{display:flex;gap:15px;align-items:center;background:#eaf0e6;border:1px solid #dce6d6;border-radius:5px;padding:18px 22px;margin:36px 0 26px}.resource-notice p{font-size:12px;color:var(--muted);margin:0}.resource-notice strong{color:var(--ink);font-weight:600}.notice-icon{font-size:26px;color:var(--green)}.chapter-tools{display:flex;justify-content:space-between;gap:24px;align-items:center}.filters{display:flex;gap:6px;flex-wrap:wrap}.filter{border-radius:4px;padding:11px 13px;font-size:11px;white-space:nowrap}.filter.active{background:var(--green);color:white}.filter:hover:not(.active){background:var(--sage)}.search-box{display:flex;gap:8px;align-items:center;background:#fff;border:1px solid var(--line);border-radius:4px;padding:9px 12px;min-width:190px}.search-box>span{font-size:23px;line-height:1;color:var(--muted)}.search-box input{border:none;background:transparent;font-size:12px;width:100%;min-width:0;outline-offset:2px}.results-label{font-size:10px;letter-spacing:1px;text-transform:uppercase;color:var(--muted);margin:26px 0 13px}.chapter-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.chapter-card{display:flex;align-items:center;text-align:left;gap:17px;background:white;border:1px solid var(--line);padding:20px;min-height:108px;border-radius:5px;width:100%;transition:transform .15s,border-color .15s,box-shadow .15s}.chapter-card:hover{transform:translateY(-2px);border-color:#97b4a2;box-shadow:0 4px 10px #14392b08}.chapter-number{font-family:Georgia,serif;color:#778d79;font-size:28px;width:37px;flex-shrink:0;align-self:flex-start;padding-top:3px}.chapter-content{flex:1}.chapter-title{display:block;font-size:14px;line-height:1.4;font-weight:600;margin-bottom:8px}.chapter-meta{display:flex;align-items:center;gap:11px;font-size:10px;color:var(--muted)}.coming-soon{padding-left:11px;border-left:1px solid var(--line)}.card-arrow{font-size:20px;color:#6a8272;margin-left:5px}.page-note{font-size:11px;color:var(--muted);margin:25px 0 0}.empty-results{text-align:center;border:1px dashed var(--line);padding:40px}.empty-results p{font-size:13px}.text-button{color:var(--green);font-size:12px;font-weight:600;padding:8px 0}.text-button:hover{text-decoration:underline}.how-section{background:#eaf0e6;border-top:1px solid #dbe4d7;border-bottom:1px solid #dbe4d7;padding:65px 0}.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:50px;margin-top:40px}.steps article{border-top:1px solid #cbd9c4;padding-top:23px}.step-number{font-family:Georgia,serif;font-size:25px;color:#738b6d;display:block;margin-bottom:25px}.steps h3{font-size:17px;margin-bottom:11px}.steps p{font-size:13px;color:var(--muted);max-width:300px;margin-bottom:0}.help-section{display:grid;grid-template-columns:1fr 1.4fr;gap:65px;padding-top:74px;padding-bottom:83px}.help-section .eyebrow{margin-bottom:15px}.help-section>div>p:last-child{font-size:13px;color:var(--muted);margin-top:22px}.faq-list{padding-top:6px}details{border-bottom:1px solid var(--line)}summary{list-style:none;padding:22px 0;display:flex;justify-content:space-between;gap:20px;cursor:pointer;font-size:14px;font-weight:600}summary::-webkit-details-marker{display:none}summary>span{font-size:18px;line-height:1;color:var(--muted);font-weight:400}details[open] summary>span{transform:rotate(45deg)}details p{font-size:13px;color:var(--muted);padding-right:30px;margin-bottom:23px}.site-footer{max-width:1192px;margin:auto;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:20px;padding:30px 0}.site-footer .brand{font-size:16px}.site-footer .brand-mark{width:30px;height:32px;font-size:27px}.site-footer p,.site-footer small{font-size:10px;color:var(--muted);margin:0}.site-footer p{font-family:Georgia,serif;font-style:italic;font-size:13px}dialog{border:1px solid var(--line);border-radius:12px;color:var(--ink);background:var(--paper);padding:0;width:min(580px,calc(100% - 32px));max-height:90vh}dialog::backdrop{background:#142e28a6;backdrop-filter:blur(3px)}.dialog-inner{padding:38px;position:relative}.close-button{position:absolute;right:15px;top:10px;font-size:30px;width:40px;height:40px;color:var(--muted)}.dialog-inner>.eyebrow{padding-right:24px;margin-bottom:17px}.dialog-inner h2{font-size:33px;line-height:1.15;margin-bottom:15px;letter-spacing:-1px}.dialog-focus{font-size:14px;color:var(--muted)}.workbook-reference{display:flex;gap:15px;align-items:center;background:var(--sage);padding:17px 20px;border-radius:5px;margin:24px 0}.workbook-reference>span{font-size:28px;color:var(--green)}.workbook-reference strong{font-size:13px}.workbook-reference p{margin:5px 0 0;color:var(--muted);font-size:12px}.video-placeholder{border:1px dashed #bdcdb6;background:#f1f4ed;text-align:center;border-radius:6px;padding:28px 25px}.play-symbol{display:inline-grid;place-items:center;width:48px;height:48px;border-radius:50%;border:1px solid #b8cab0;font-size:29px;color:var(--green);padding-left:3px;margin-bottom:18px}.video-placeholder h3{font-size:16px;margin-bottom:10px}.video-placeholder p{font-size:12px;color:var(--muted);margin-bottom:19px}.status-pill{display:inline-block;background:#e0e8d9;border-radius:3px;padding:7px 10px;font-size:8px;letter-spacing:1.5px;color:#4c684a}.dialog-actions{display:flex;gap:15px;align-items:center;margin:15px 0}.dialog-actions>span{font-size:11px;color:var(--muted);overflow-wrap:anywhere;min-width:0}.chapter-navigation{display:flex;justify-content:space-between;border-top:1px solid var(--line);padding-top:16px;gap:18px}.chapter-navigation button{font-size:11px;padding:8px 0}.chapter-navigation button:not(:disabled):hover{text-decoration:underline}body.dialog-open{overflow:hidden}[hidden]{display:none!important}
@media(min-width:1450px){.book-strip{padding-right:calc((100vw - 1192px)/2);padding-left:calc((100vw - 1192px)/2)}}
@media(max-width:1050px){.site-header{padding:0 36px}.hero{padding:56px 45px 60px 36px;gap:30px}h1{font-size:56px}.hero-art{min-height:430px}.book-cover{width:235px}.book-backdrop{width:330px;height:330px}.edition-tag{right:-10px;bottom:60px;padding:14px}.note-two{font-size:14px;bottom:10px}.book-strip{padding:22px 36px}.book-strip .edition{display:none}.section-wrap{padding-left:36px;padding-right:36px}.chapter-tools{flex-wrap:wrap;gap:15px}.search-box{flex:1;max-width:250px}.chapter-card{padding:17px;gap:12px}.chapter-title{font-size:13px}.chapter-number{width:30px}.site-footer{margin:0 36px}.steps{gap:30px}}
@media(max-width:700px){.site-header{height:83px;padding:0 22px}.brand{font-size:17px}.brand-mark{width:32px;height:35px;font-size:30px}.site-header nav{gap:18px;font-size:11px}.site-header nav a:last-child{display:none}.hero{grid-template-columns:1fr;padding:43px 24px 40px;gap:24px}.hero-copy{text-align:center}.eyebrow{font-size:9px}.hero-copy .eyebrow{justify-content:center;margin-bottom:22px}h1{font-size:53px;margin-bottom:25px}.hero-book{font-size:17px}.hero-description{font-size:14px;margin-left:auto;margin-right:auto;max-width:350px}.button{font-size:12px;padding:16px 22px}.hero-note{justify-content:center}.hero-art{min-height:365px;max-width:355px;width:100%;margin:5px auto 10px}.book-cover{width:210px}.book-backdrop{width:305px;height:305px;bottom:28px;right:5px}.note-one{font-size:18px;right:10px;top:1px}.note-two{bottom:-2px;right:2px;font-size:13px}.edition-tag{bottom:40px;right:0;padding:12px 14px;font-size:7px}.edition-tag small{font-size:9px}.book-strip{justify-content:center;padding:23px;flex-direction:column;gap:7px;font-size:8px}.book-strip p{font-size:11px}.section-wrap{padding-left:22px;padding-right:22px}.chapter-section{padding-top:46px;padding-bottom:45px}.section-heading{display:block;margin-bottom:25px}.section-heading>p{margin:17px 0 0;font-size:12px}.section-heading>p br{display:none}h2{font-size:34px}.resource-notice{padding:16px;gap:12px;align-items:flex-start;margin-top:25px}.resource-notice p{font-size:11px}.resource-notice strong{display:block;margin-bottom:3px}.notice-icon{line-height:1.4}.chapter-tools{display:block}.filters{gap:3px}.filter{font-size:10px;padding:10px 9px}.search-box{margin-top:16px;max-width:none;padding:11px}.chapter-grid{grid-template-columns:1fr;gap:9px}.chapter-card{padding:19px 17px;min-height:96px}.chapter-number{width:32px;font-size:26px}.chapter-title{font-size:13px}.chapter-meta{font-size:9px}.results-label{margin-top:22px}.page-note{font-size:10px}.how-section{padding:44px 0}.steps{grid-template-columns:1fr;gap:26px;margin-top:30px}.steps article{padding-top:20px;display:grid;grid-template-columns:38px 1fr;column-gap:12px}.step-number{grid-row:1/3;font-size:24px}.steps h3{font-size:16px;margin-bottom:8px}.steps p{font-size:12px;max-width:none}.help-section{grid-template-columns:1fr;gap:12px;padding-top:45px;padding-bottom:48px}.help-section h2 br{display:none}.help-section>div>p:last-child{font-size:12px}.help-section>div>p:last-child br{display:none}.faq-list{padding-top:0}summary{font-size:12px;gap:12px;line-height:1.5}details p{font-size:12px}.site-footer{margin:0 22px;padding:25px 0 30px;flex-wrap:wrap;gap:15px}.site-footer .brand{font-size:15px}.site-footer p{display:none}.site-footer small{font-size:9px}.dialog-inner{padding:32px 23px 22px}.dialog-inner h2{font-size:29px}.dialog-focus{font-size:12px}.video-placeholder{padding:24px 18px}.video-placeholder h3{font-size:15px}.dialog-actions{flex-wrap:wrap;gap:4px}.chapter-navigation button{font-size:10px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important}}