:root{--nav-bg:#f7f7f0;--nav-ink:#293e35;--nav-line:#d9ded0;--nav-active:#365d4b}
.has-study-nav{padding-top:0}#study-site-nav{position:sticky;top:0;z-index:90;background:var(--nav-bg);border-bottom:1px solid var(--nav-line);font:14px/1.5 'Segoe UI','Microsoft YaHei',sans-serif;color:var(--nav-ink)}#study-site-nav a{color:inherit;text-decoration:none}#study-site-nav a:hover{text-decoration:underline}.study-global-row{height:64px;padding:10px 25px;display:flex;align-items:center;gap:24px}.study-logo{display:flex;align-items:center;gap:10px;white-space:nowrap}.study-logo>span{font:37px/1 Georgia,serif;color:var(--nav-active)}.study-logo b{font-size:17px}.study-location{font-size:12px;color:#73806b}#nav-sync{font-size:11px;color:#727b6c;margin-left:auto}.study-tools-menu{position:relative;white-space:nowrap;font-size:12px;margin-left:auto}.study-tools-menu>summary{cursor:pointer;list-style:none;border:1px solid var(--nav-line);border-radius:7px;padding:8px 12px}.study-tools-menu[open]>summary{background:#e7eddf}#nav-tools{position:absolute;right:0;top:calc(100% + 12px);width:260px;max-height:70dvh;overflow:auto;padding:15px;background:#fffefa;border:1px solid var(--nav-line);border-radius:10px;box-shadow:0 12px 35px #23351f22;display:grid;gap:7px}#nav-tools>a{padding:8px 9px;border-radius:5px}#nav-tools>a:hover{background:#edf0e6}.study-account-controls{display:grid;gap:7px;border-top:1px solid var(--nav-line);padding-top:10px}.study-account-controls button,.study-account-controls form{display:block;width:100%;margin:0;text-align:left}.study-sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}
#study-course-directory{position:fixed;top:64px;left:0;bottom:0;width:260px;background:#f0f2e8;border-right:1px solid #d9dece;padding:22px 14px 16px;display:flex;flex-direction:column;gap:14px;color:#36513e;z-index:65;box-sizing:border-box}#study-course-directory[hidden]{display:none}.course-directory-heading{display:flex;align-items:center;gap:12px;justify-content:space-between;font-size:12px}.course-directory-heading select{width:105px;font-size:13px;padding:7px 10px}#course-filter{width:100%;font-size:12px;padding:8px 10px}.course-lessons{overflow:auto;flex:1;display:flex;flex-direction:column;gap:4px;scrollbar-width:thin;position:relative}.course-lessons a{display:flex;align-items:baseline;gap:10px;padding:10px 9px;text-decoration:none;border-left:3px solid transparent;border-radius:5px;color:#62705a}.course-lessons a>span{font:15px/1.5 Georgia,serif;color:#9aa68c}.course-lessons a>b{font-size:12px;line-height:1.7;font-weight:400}.course-lessons a:hover{background:#e7ecde}.course-lessons a[aria-current=page]{background:#dfe8d4;border-left-color:#59774a;color:#2f4a36}.course-lessons a[aria-current=page]>b{font-weight:700}.course-catalog-home{font-size:11px;color:#738266;padding-left:13px}.study-mobile-courses{display:none}
.has-study-nav #stage-nav,.has-study-nav #stages,.has-study-nav .volume-links,.has-study-nav .sidebar,.has-study-nav .study-layout>aside,.has-study-nav .mobile-only{display:none!important}.has-study-nav:not(.study-home-page) main{margin-left:260px;max-width:none;padding:28px 34px 60px}.study-reader-page .topbar{display:none}.study-reader-page .page-shell{padding:0;max-width:1140px;margin:auto}.has-study-nav .study-layout{display:block}.has-study-nav .study-main{max-width:1140px;margin:auto}.has-study-nav [hidden]{display:none!important}
#study-context{background:#f7f7f0;border:1px solid #dce1d2;border-radius:10px;padding:12px 16px;margin:22px 0 24px;color:#36513e;position:sticky;top:74px;z-index:50;box-shadow:0 3px 12px #35462c08}.lesson-content-heading{display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:11px;color:#7f8974;margin-bottom:8px}.lesson-source-link{color:#758268;font-size:11px;white-space:nowrap}.lesson-lanes{display:flex;gap:6px;align-items:center}.lesson-lanes>a{padding:8px 18px;border-radius:6px;text-decoration:none;color:#64745a;font-size:13px}.lesson-lanes>a:first-child{margin-right:auto;padding-left:0}.lesson-lanes>a[aria-current=page]{background:#e1ead6;color:#36513e;font-weight:700}.lesson-lanes>a:first-child[aria-current=page]{background:transparent;color:#36513e;text-decoration:underline;text-underline-offset:6px}.lesson-lanes>a:hover{background:#eaf0e2}.lesson-item-picker{display:flex;align-items:center;gap:16px;border-top:1px solid #e0e5d6;margin-top:10px;padding-top:12px}.lesson-item-picker label{font-size:11px;white-space:nowrap;color:#7b886d}.lesson-item-picker select{flex:1;min-width:0;max-width:100%;font-size:13px;color:#36513e;background:#fffefa;border:1px solid #cdd6bd;border-radius:7px;padding:9px 12px}.lesson-aux-position{font-size:12px;margin:12px 0 0;color:#829076}
.has-study-nav .reading-tabs,.has-study-nav .article-tabs,.has-study-nav .card-top,.has-study-nav #grammar-select,.has-study-nav label[for=grammar-select],.has-study-nav .vocab-tabs{display:none!important}.has-study-nav .reading-position{font-size:11px;margin:0 0 16px;color:#8b967e}.has-study-nav .inline-reading-active #hero{display:none}.has-study-nav.inline-reading-active #study-context{max-width:1140px;margin:0 auto 24px}.has-study-nav .study-panel{margin-top:20px}.has-study-nav .inline-reading-paper{margin-top:0}
.lesson-overview{background:#fffefa;border:1px solid #dedfd2;border-radius:12px;padding:26px}.lesson-overview>h2{font-size:22px;margin:0 0 10px}.lesson-overview>p{font-size:13px;color:#7b856e}.lesson-directory-grid{display:grid;grid-template-columns:1fr 1.25fr 1fr;gap:24px;margin:26px 0}.lesson-directory-grid>section{min-width:0}.lesson-directory-grid h3{font-size:17px;border-bottom:1px solid #dde3d3;padding-bottom:12px;margin:0 0 10px}.lesson-directory-grid h3>small{display:block;font-size:11px;font-weight:400;color:#929b85;margin-top:4px}.lesson-directory-grid ol{list-style:none;padding:0;margin:0}.lesson-directory-grid li>a{display:flex;flex-direction:column;gap:5px;padding:12px 4px;border-bottom:1px solid #e9ecdf;text-decoration:none;color:#36513e}.lesson-directory-grid li>a:hover{background:#f0f4e7}.lesson-directory-grid li>a>span{font-size:10px;color:#9ca78e}.lesson-directory-grid li>a>b{font-size:13px;line-height:1.7;font-weight:500}.lesson-directory-grid li>a>b[lang=es]{font:17px/1.5 Georgia,serif}.lesson-directory-grid li>a>small{font-size:11px;color:#929b85}.lesson-vocab-links{display:grid;gap:9px;margin-top:17px;font-size:12px}.lesson-directory-note{font-size:11px;line-height:1.8;color:#929b85}.lesson-directory-source{display:block;font-size:12px;margin-top:20px}.lesson-goals{border-top:1px solid #e2e6d8;padding-top:16px;font-size:13px;line-height:1.9}.lesson-goals summary{cursor:pointer;color:#687a59}
.study-source-page #volumes,.study-source-page .source-course-picker,.has-study-nav .vocab-course-picker{display:none!important}.study-source-page .library-layout{display:flex;flex-direction:column}.study-source-page .library-layout>aside{order:0;padding:0}.source-tools{padding:16px 20px;border:1px solid #dedfd2;border-radius:10px;background:#fbfaf5;margin:0 0 20px}.source-tools>summary{cursor:pointer;color:#365d4b}.source-tools #volume-title{font-size:18px;margin-top:15px}.source-tools #bookmarks{max-height:200px;overflow:auto}.has-study-nav .intro h1{font-size:28px}.has-study-nav .intro p{font-size:13px}
#study-site-nav a:focus-visible,#study-site-nav summary:focus-visible,#study-course-directory a:focus-visible,.lesson-lanes a:focus-visible,.lesson-directory-grid a:focus-visible{outline:2px solid #78885d;outline-offset:2px}
.study-home-page{background:#f6f5ef;color:#293e35}.study-home-page main{margin:auto;max-width:1260px;padding:36px 40px 60px}.study-home-intro{padding:12px 0 30px;border-bottom:1px solid #dce1d4;margin-bottom:30px}.study-eyebrow{font-size:10px;letter-spacing:2.5px;color:#9b795c}.study-home-intro h1{font:500 clamp(28px,4vw,40px)/1.4 'Microsoft YaHei',sans-serif;margin:14px 0}.study-home-intro>p{color:#75806e}.study-continue{display:inline-block;background:#365d4b;color:white!important;border-radius:8px;padding:10px 18px;margin-top:12px;text-decoration:none;font-size:13px}.study-home-intro small{display:block;font-size:11px;color:#919985;margin-top:10px}.study-step{display:inline-flex;width:24px;height:24px;align-items:center;justify-content:center;border:1px solid #b7c3a9;border-radius:50%;font-size:13px;margin-right:7px}.study-home-page h2{font-size:19px}.study-volume-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.study-volume-card{display:flex;position:relative;flex-direction:column;gap:13px;border:1px solid #d9dfcf;border-radius:10px;background:#fffefa;padding:20px;color:#365d4b;text-decoration:none}.study-volume-card[aria-current=true]{background:#eaf0e2;border:2px solid #65805a;padding:19px}.study-volume-card>b{font-size:13px}.study-volume-card>span:not(.study-volume-number){font-size:14px;line-height:1.7}.study-volume-card small{font-size:11px;color:#7e8875}.study-volume-number{font:30px/1 Georgia;color:#a7b496}.study-catalog-heading{display:flex;align-items:center;justify-content:space-between;gap:15px;margin:32px 0 18px}.study-catalog-heading h2{margin:0}.study-catalog-heading>span{font-size:12px;color:#7e8875}.study-lesson-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;list-style:none;padding:0;margin:0}.study-lesson-grid a{display:flex;flex-direction:column;gap:8px;border:1px solid #d9dfcf;border-radius:9px;background:#fffefa;padding:18px 20px;text-decoration:none;color:#365d4b;height:100%}.study-lesson-grid a:hover,.study-lesson-grid a[aria-current=true]{background:#edf1e6;border-color:#9aaf89}.study-lesson-grid a>span{font-size:11px;color:#8a947d}.study-lesson-grid b{font:500 18px/1.5 Georgia,'Microsoft YaHei',serif}.study-lesson-grid small{font-size:11px;color:#8a947d}.study-home-footnote{font-size:12px;margin:30px 0}#lesson-catalog{scroll-margin-top:85px}
@media(max-width:1200px){.lesson-directory-grid{grid-template-columns:1fr 1fr}.lesson-directory-grid>section:last-child{grid-column:1/-1}.lesson-directory-grid>section:last-child ol{display:flex;flex-wrap:wrap;gap:15px}.lesson-directory-grid>section:last-child li{flex:1;min-width:180px}}
@media(max-width:900px){#study-course-directory{display:none}#nav-sync{display:none}.study-global-row{height:56px;padding:8px 18px}.study-logo b{font-size:15px}.study-mobile-courses{display:flex;gap:8px;border-top:1px solid #e3e8da;padding:8px 18px}.study-mobile-courses select{font-size:12px;padding:8px;min-width:0;border-radius:7px;background:#fffefa;color:#36513e;border:1px solid #cfd7c0}.study-mobile-courses .course-book-select{width:88px;flex:none}#course-lesson-mobile{flex:1}.has-study-nav:not(.study-home-page) main{margin-left:0;padding:24px}#study-context{position:static}.lesson-directory-grid{grid-template-columns:1fr 1fr}.study-volume-grid{grid-template-columns:1fr 1fr}}
@media(max-width:650px){.study-global-row{gap:12px;padding:8px 13px}.study-logo b{display:none}.study-logo>span{font-size:30px}.study-location{font-size:11px}.study-tools-menu>summary{font-size:11px;padding:7px}.study-mobile-courses{padding:7px 13px}.has-study-nav:not(.study-home-page) main{padding:18px 14px 45px}#study-context{padding:11px 12px;margin:16px 0}.lesson-lanes{gap:3px}.lesson-lanes>a{font-size:12px;padding:8px 13px}.lesson-item-picker{display:block;padding-top:10px}.lesson-item-picker label{display:block;margin-bottom:6px}.lesson-item-picker select{display:block;width:100%;font-size:12px;padding:9px 8px}.lesson-overview{padding:18px}.lesson-directory-grid{display:block;margin-top:22px}.lesson-directory-grid>section{margin-bottom:27px}.lesson-directory-grid>section:last-child ol{display:block}.lesson-directory-grid h3>small{display:inline;margin-left:10px}.lesson-directory-grid li>a{padding:11px 3px}.lesson-vocab-links{display:flex;gap:13px;flex-wrap:wrap}.has-study-nav .intro h1{font-size:23px}.source-tools{padding:13px}.study-source-page .page-controls{gap:6px}.study-source-page .page-controls input{width:82px}.study-source-page .page-controls button{padding:7px 8px}.study-home-page main{padding:24px 17px}.study-home-intro{padding:8px 0 25px}.study-volume-grid{grid-template-columns:1fr 1fr;gap:10px}.study-volume-card{padding:15px;gap:10px}.study-volume-card[aria-current=true]{padding:14px}.study-volume-card>b{font-size:12px}.study-volume-card>span:not(.study-volume-number){font-size:12px}.study-catalog-heading{align-items:flex-start;flex-direction:column;gap:8px;margin-top:26px}.study-lesson-grid{grid-template-columns:1fr}.study-lesson-grid a{padding:16px}}

#study-course-directory select,#study-course-directory input{font:13px/1.5 "Segoe UI","Microsoft YaHei",sans-serif;background:#fffefa;border:1px solid #cbd4bc;border-radius:7px;color:#36513e}

.study-quick-map{display:none}@media(max-width:900px){.study-quick-map{display:block;font-size:12px;white-space:nowrap;padding:6px 8px;border:1px solid #d3dcc5;border-radius:6px}.study-global-row{gap:12px}}
#local-record-notice{white-space:normal;overflow-wrap:anywhere;line-height:1.8;color:#727b6c;margin:4px 0}#login-link{white-space:normal;padding:8px 9px}

.course-reading-label{display:block;width:fit-content;font:11px/1.6 'Segoe UI','Microsoft YaHei',sans-serif!important;color:#7c8473!important;font-weight:400!important;margin-top:4px;padding:1px 7px;border:1px solid #dce1d3;border-radius:4px;background:#f6f7f0}.course-reading-label[data-reading-status=read]{color:#826126!important;background:#faf2dc;border-color:#e4d4a6}.course-reading-label[data-reading-status=finished]{color:#365d4b!important;background:#e2eddb;border-color:#b9ceab}
#lesson-reading-progress{max-width:1140px;margin:0 auto 20px;padding:13px 16px;border:1px solid #dce1d2;background:#fafbf5;border-radius:9px;color:#53664b;font:12px/1.8 'Segoe UI','Microsoft YaHei',sans-serif}#lesson-reading-progress .reading-mark-row{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}.reading-mark-title{display:flex;align-items:center;gap:10px;white-space:nowrap}.reading-mark-title b{font-size:12px;font-weight:500;color:#7c8473}.reading-mark-title b[data-reading-status=read]{color:#826126}.reading-mark-title b[data-reading-status=finished]{color:#365d4b}.reading-mark-actions{display:flex;align-items:center;gap:8px;flex-wrap:wrap}#lesson-reading-progress button{font:12px/1.5 'Segoe UI','Microsoft YaHei',sans-serif;padding:7px 11px;border:1px solid #ccd6be;border-radius:6px;background:#fffefa;color:#365d4b;cursor:pointer}#lesson-reading-progress button:disabled{color:#86907b;background:#f0f3e8;cursor:default}#lesson-reading-progress details{margin-top:8px;font-size:11px;color:#7e8974}#lesson-reading-progress summary{cursor:pointer;width:fit-content}#lesson-reading-progress details p{line-height:1.9;overflow-wrap:anywhere;margin:8px 0}.reading-mark-notice{color:#657b52;font-size:11px}
@media(max-width:650px){#lesson-reading-progress{padding:11px 12px;margin-bottom:16px}.reading-mark-title{font-size:11px}.reading-mark-actions{gap:6px}#lesson-reading-progress button{padding:6px 9px;font-size:11px}}

/* Each lesson's grammar is a continuous document, including legacy card links. */
.lesson-grammar{background:#fffef8;border:1px solid #dedfd2;border-radius:12px;padding:clamp(18px,4vw,38px);margin:20px 0;line-height:1.95;overflow-wrap:anywhere}
.lesson-grammar h2{margin:4px 0 16px;font-size:25px}.lesson-grammar h3{font-size:21px;line-height:1.6;margin:0 0 18px}.grammar-intro{padding-bottom:24px}.grammar-intro p{margin:12px 0}.grammar-section{border-top:1px solid #dce1d2;padding:32px 0;scroll-margin-top:150px}.grammar-section:last-of-type{padding-bottom:8px}.grammar-section p{white-space:pre-line;margin:14px 0}.grammar-number{color:#7a8668}.grammar-purpose{color:#666f58}.grammar-explanation{font-size:16px}.grammar-remember{background:#edf0e2;border-left:3px solid #9eae80;padding:15px 18px;margin:20px 0}.grammar-remember p{margin:5px 0}.grammar-examples{padding:4px 0 4px 20px;border-left:2px solid #ccd6b9}.grammar-examples p[lang=es]{font-family:Georgia,serif;font-size:18px;line-height:1.9}.grammar-example-label,.grammar-source-pages,.grammar-evidence{font-size:13px;color:#737c65}.grammar-evidence{overflow-wrap:anywhere}.grammar-inventory{border-top:1px solid #dce1d2;padding-top:28px;margin-top:26px}.grammar-inventory li{margin:8px 0}.lesson-directory-grid .grammar-topic-summary{padding:8px 10px;font-size:14px;line-height:1.6;color:#657056}
@media(max-width:650px){.lesson-grammar h3{font-size:19px}.grammar-section{padding:25px 0}.grammar-remember{padding:12px 14px}.grammar-examples{padding-left:14px}}