/* 看懂一张脸 · Reading edition. Entirely local, responsive, print-friendly. */
@font-face{font-family:CourseReading;src:url('../fonts/reading.woff2') format('woff2'),url('../fonts/reading.woff') format('woff');font-style:normal;font-weight:400;font-display:swap}
:root{--paper:#f8faf8;--surface:#fff;--soft:#eef2ef;--soft-blue:#edf1f4;--ink:#263b38;--muted:#5f6d67;--faint:#65706b;--accent:#3b6555;--accent-deep:#244c3c;--line:#dce3de;--line-dark:#bac9c1;--sage:#dce6dd;--blue:#dee7ee;--shadow:0 16px 48px rgba(32,56,45,.09);--reader-font-size:20px;--reader-line-height:2;--sans:-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;--serif:CourseReading,'Songti SC','Noto Serif CJK SC','Source Han Serif SC',serif;--header-height:92px;color-scheme:light}
html[data-theme=dark]{--paper:#17221f;--surface:#1d2b27;--soft:#24342e;--soft-blue:#243038;--ink:#e4ebe6;--muted:#abbab1;--faint:#8c9d93;--accent:#a5c6b3;--accent-deep:#c2d7c8;--line:#35483e;--line-dark:#52675b;--sage:#2b4133;--blue:#2d3c45;--shadow:0 16px 48px rgba(0,0,0,.22);color-scheme:dark}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:130px}body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:15px;line-height:1.7;-webkit-font-smoothing:antialiased}body.modal-open{overflow:hidden}h1,h2,h3,h4,p,figure,blockquote{margin:0}h1,h2,h3,h4{font-weight:500;line-height:1.4}a{color:inherit;text-decoration:none;text-underline-offset:4px}button,input,select,textarea{font:inherit}button,a,input,select,summary,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button,input,select,textarea{color:inherit}button{background:none;border:0}button:disabled{cursor:not-allowed;opacity:.45}img{max-width:100%;height:auto;display:block}svg{width:21px;height:21px;fill:none;stroke:currentColor;stroke-width:1.5;stroke-linecap:round;stroke-linejoin:round;flex:none}ul,ol{padding-left:1.5em}strong,b{font-weight:600}::selection{background:var(--sage);color:var(--ink)}:focus-visible{outline:2px solid var(--accent);outline-offset:5px;border-radius:2px}[hidden]{display:none!important}.serif{font-family:var(--serif);font-weight:500;letter-spacing:.015em}.eyebrow{font-size:10px;line-height:1.6;font-weight:600;letter-spacing:.15em;color:var(--accent);text-transform:uppercase}.sr-only{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:fixed;left:20px;top:-80px;padding:12px 20px;background:var(--ink);color:var(--paper);z-index:200}.skip-link:focus{top:12px}.no-js .js-only{display:none!important}.input{background:var(--surface);border:1px solid var(--line);min-height:48px;padding:11px 15px;border-radius:3px;min-width:0}.input::placeholder,textarea::placeholder{color:var(--faint);opacity:1}.input:focus,textarea:focus{outline:0;border-color:var(--accent);box-shadow:0 0 0 3px color-mix(in srgb,var(--sage) 65%,transparent)}.button,.quiet-button,.complete-button,.danger-button{display:inline-flex;align-items:center;justify-content:center;gap:20px;min-height:48px;padding:12px 22px;font-size:13px;line-height:1.6;border-radius:3px;transition:background .18s,border-color .18s,color .18s}.button{background:var(--accent-deep);color:var(--surface);border:1px solid var(--accent-deep)}html[data-theme=dark] .button{color:#17221f}.button:hover{background:var(--accent);border-color:var(--accent)}.button svg{width:18px}.quiet-button{border:1px solid var(--line);background:var(--surface)}.quiet-button:hover{border-color:var(--line-dark);background:var(--soft)}.complete-button{border:1px solid var(--accent);color:var(--accent);min-width:120px}.complete-button[aria-pressed=true]{background:var(--sage)}.icon-button{display:inline-flex;align-items:center;justify-content:center;min-width:44px;min-height:44px;padding:10px;border-radius:50%;border:1px solid transparent}.icon-button:hover{background:var(--soft)}.text-link,.subtle-link{display:inline-flex;align-items:center;gap:15px;font-size:13px;line-height:1.7;min-height:44px;color:var(--accent)}.text-link:hover,.subtle-link:hover{text-decoration:underline}.text-link svg{width:18px}.micro-copy{font-size:11px;color:var(--muted);line-height:1.8}.no-script{padding:18px 22px;background:var(--soft);border-left:3px solid var(--accent);font-size:13px}.no-script a{text-decoration:underline}.site-main{width:min(1184px,calc(100% - 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/* Opening spread */
.hero{display:grid;grid-template-columns:1.13fr .87fr;position:relative;min-height:660px;padding-top:48px;column-gap:70px}.hero-copy{padding:45px 0 64px}.hero-copy .eyebrow{margin-bottom:30px;font-size:11px;letter-spacing:.18em}.hero h1{font-size:clamp(44px,4.5vw,62px);line-height:1.38;letter-spacing:.055em;margin-left:-.05em}.hero-subtitle{font-size:18px;font-family:var(--serif);margin-top:30px;letter-spacing:.025em}.hero-description{max-width:430px;margin-top:15px;font-size:13px;line-height:2.05;color:var(--muted)}.hero-actions{display:flex;align-items:center;gap:28px;margin-top:32px;flex-wrap:wrap}.hero-credits{display:flex;align-items:center;gap:24px;font-size:10px;color:var(--muted);margin-top:38px}.hero-credits span+span{border-left:1px solid var(--line-dark);padding-left:24px}.hero-visual{position:relative;align-self:start;height:568px;overflow:hidden;background:#f1f3f2}.hero-visual>img{width:100%;height:100%;object-fit:cover;object-position:center 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var(--line);background:var(--soft)}.continue-card h2{font-size:25px;margin-top:16px;line-height:1.55}.continue-link{display:flex;align-items:center;justify-content:space-between;gap:20px;color:var(--accent);padding:15px 0 12px;font-size:13px;min-height:44px;font-weight:500}.continue-link:hover{text-decoration:underline}.continue-link svg{width:18px}.continue-card .micro-copy{font-size:10px;margin-top:3px;max-width:285px}.continue-card .subtle-link{font-size:11px;margin-top:5px}.find-card{padding:32px 40px}.find-card h2{font-size:22px;font-family:var(--serif);margin-top:15px}.quick-search{border-bottom:1px solid var(--line-dark);display:flex;align-items:center;margin-top:22px;padding-bottom:5px}.quick-search input{border:0;background:transparent;font-size:13px;min-width:0;width:100%;padding:10px 0;min-height:44px}.quick-search input:focus{outline:0}.quick-search:focus-within{border-color:var(--accent)}.quick-search input::placeholder{color:var(--faint)}.keyword-links{display:flex;flex-wrap:wrap;gap:6px 8px;margin-top:15px}.keyword-links a{font-size:10px;background:var(--soft);padding:6px 11px;min-height:30px}.keyword-links a:hover{background:var(--sage)}.find-footnote{font-size:10px;color:var(--muted);margin-top:20px}.find-footnote a{color:var(--accent);margin-left:7px}.home-section{margin-top:104px}.section-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:38px;margin-bottom:34px}.section-heading .eyebrow{margin-bottom:14px}.section-heading h2{font-size:31px;line-height:1.5}.section-heading p:not(.eyebrow){font-size:12px;color:var(--muted);line-height:1.95;margin-top:12px}.section-heading .section-description{max-width:295px;margin:0;font-size:12px}.section-heading .text-link{flex:none;padding-bottom:6px}.study-steps{display:grid;grid-template-columns:repeat(3,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.study-steps>a{padding:30px 35px 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/* Catalog, units and editorial pages */
.page-intro{padding:72px 0 46px;max-width:850px}.page-intro h1{font-size:43px;line-height:1.5;margin-top:17px}.page-intro>p:not(.eyebrow){color:var(--muted);font-size:14px;line-height:1.95;max-width:720px;margin-top:19px}.page-intro .continue-link{justify-content:flex-start;display:inline-flex;margin-top:12px;font-size:12px}.catalog-toolbar{display:grid;grid-template-columns:1fr 225px 145px auto;gap:12px;align-items:center;border-top:1px solid var(--line);padding-top:26px}.catalog-toolbar .input{font-size:12px}.filter-search{position:relative}.filter-search svg{position:absolute;left:15px;top:14px;width:18px;height:18px;color:var(--muted)}.filter-search input{width:100%;padding-left:43px}.catalog-summary{font-size:11px;color:var(--muted);white-space:nowrap;padding-left:10px}.catalog-summary strong{color:var(--accent)}.search-info{font-size:12px;color:var(--muted);margin-top:16px;min-height:22px}.catalog-grid{margin-top:35px;display:grid;grid-template-columns:1fr 1fr;gap:45px 44px}.catalog-group{scroll-margin-top:30px;min-width:0}.catalog-group-heading{display:flex;gap:20px;justify-content:space-between;align-items:flex-end;padding-bottom:18px;border-bottom:1px solid var(--line-dark)}.catalog-group-heading h2{font-size:22px;margin-top:8px;line-height:1.55}.catalog-group-heading .eyebrow{font-size:9px}.catalog-group-heading .subtle-link{font-size:10px;flex-shrink:0;min-height:30px}.course-row{display:grid;grid-template-columns:58px 1fr 45px 12px;gap:13px;align-items:center;min-height:76px;padding:16px 0;border-bottom:1px solid var(--line);position:relative}.course-num{font-size:9px;color:var(--muted);line-height:1.6;white-space:nowrap}.course-copy{min-width:0;display:block}.course-name{font-size:13px;line-height:1.7;display:block}.course-duration{font-size:9px;color:var(--faint);white-space:nowrap;text-align:right}.course-row-arrow{font-size:16px;color:var(--faint)}.course-row:hover .course-name{color:var(--accent)}.course-row:hover .course-row-arrow{color:var(--accent)}.course-row.is-complete:before,.course-row.completed:before{content:'✓';position:absolute;left:-17px;color:var(--accent);font-size:11px}.course-row.is-bookmarked .course-name:after{content:' · 收藏';font-size:9px;color:var(--accent);font-weight:400}.catalog-empty{padding:45px 20px;text-align:center;background:var(--soft);margin-top:25px;color:var(--muted);font-size:13px}.unit-main>.breadcrumb{padding-top:40px}.breadcrumb{display:flex;gap:11px;align-items:center;flex-wrap:wrap;color:var(--muted);font-size:10px;line-height:1.8}.breadcrumb a:hover{color:var(--accent);text-decoration:underline}.breadcrumb>span:not(:last-child){color:var(--line-dark)}.unit-hero{display:grid;grid-template-columns:1.4fr .6fr;gap:60px;align-items:center;margin:36px 0 45px}.unit-hero h1{font-size:43px;line-height:1.55;max-width:750px;margin:18px 0}.unit-deck{font-size:15px;line-height:2;color:var(--muted);max-width:680px}.unit-hero .button{margin-top:27px}.unit-index-art{display:flex;align-items:center;justify-content:center;flex-direction:column;aspect-ratio:1;background:var(--soft-blue);max-width:280px;width:100%;justify-self:end;border-radius:50% 50% 5px 5px}.unit-index-art>span{font-family:var(--serif);font-size:112px;line-height:1.1;color:var(--accent);opacity:.65}.unit-index-art>div{font-size:8px;text-align:center;line-height:1.8;letter-spacing:.22em;margin-top:16px;color:var(--muted)}.unit-learning-line{display:grid;grid-template-columns:1fr 1fr;gap:70px;padding:25px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);align-items:center}.unit-learning-line .unit-progress{margin:0}.unit-learning-line .unit-progress-label{font-size:11px}.unit-learning-line p{font-size:12px;color:var(--muted);line-height:1.9}.unit-lessons{margin-top:65px}.unit-lessons .section-heading{margin-bottom:24px}.unit-lessons .course-row{grid-template-columns:80px 1fr 70px 30px;gap:30px;min-height:128px}.course-row-detailed .course-num{font-size:12px}.course-row-detailed .course-name{font-family:var(--serif);font-size:22px}.course-row-detailed .course-copy>p{font-size:12px;color:var(--muted);margin-top:8px;max-width:770px;line-height:1.9}.course-row-detailed .course-duration{font-size:11px}.unit-navigation,.lesson-navigation{display:grid;grid-template-columns:1fr 1fr;gap:28px;border-top:1px solid var(--line);padding-top:30px;margin-top:55px}.unit-navigation>a,.lesson-navigation>a{padding:0 20px 0 0;display:block;min-width:0}.unit-navigation>a+a,.lesson-navigation>a+a{padding:0 0 0 28px;border-left:1px solid var(--line);text-align:right}.unit-navigation span,.lesson-navigation span{display:block;font-size:10px;color:var(--muted);margin-bottom:10px}.unit-navigation strong,.lesson-navigation strong{font-family:var(--serif);font-size:18px;font-weight:400;line-height:1.7}.unit-navigation a:hover strong,.lesson-navigation a:hover strong{color:var(--accent)}.essay-layout{display:grid;grid-template-columns:200px minmax(0,700px);gap:85px;max-width:1000px;margin:77px auto 0}.essay-aside{font-size:11px;line-height:2;color:var(--muted);padding-top:10px}.essay-aside>p+p{margin-top:25px}.essay-aside>a{display:inline-flex;margin-top:30px;min-height:44px;align-items:center;color:var(--accent)}.essay-body>h1{font-size:39px;line-height:1.6;margin:18px 0}.essay-deck{font-family:var(--serif);font-size:17px;line-height:1.9;color:var(--muted);padding-bottom:35px;border-bottom:1px solid var(--line);margin-bottom:35px}.prose{font-family:var(--serif);font-size:19px;line-height:2.1}.prose p{margin-top:1.3em;text-align:justify}.prose .signature{font-size:21px;text-align:right;margin-top:40px}.about-grid{display:grid;grid-template-columns:1fr 1fr;gap:43px 70px;border-top:1px solid var(--line);padding-top:40px}.about-grid>section{position:relative;padding-left:45px}.about-number{position:absolute;left:0;top:4px;font-family:var(--serif);font-size:17px;color:var(--faint)}.about-grid h2{font-size:19px;font-family:var(--serif)}.about-grid p{color:var(--muted);font-size:13px;line-height:2.1;margin-top:15px}.about-start{grid-column:1/-1;display:flex;align-items:center;gap:30px;margin-top:10px}.error-page{padding:100px 0}.error-code{font-family:var(--serif);font-size:100px;line-height:1;color:var(--faint)}.error-page h1{font-size:35px;margin:30px 0 20px}.error-page>p:not(.error-code){color:var(--muted);font-size:14px}
/* Reading room */
body[data-lesson]:not([data-lesson='']) .site-header{position:sticky;top:0;--header-height:76px}.reading-progress{position:fixed;top:75px;left:0;height:2px;width:0;background:var(--accent);z-index:70;transition:width .12s linear}.reader-shell{max-width:1536px;margin:auto;display:grid;grid-template-columns:minmax(175px,230px) minmax(0,760px) minmax(145px,200px);gap:48px;padding:0 35px;justify-content:center}.course-sidebar,.toc-sidebar{position:sticky;top:108px;align-self:start;height:calc(100vh - 140px);overflow-y:auto;overscroll-behavior:contain;scrollbar-width:thin;scrollbar-color:var(--line-dark) transparent;margin-top:38px;padding-bottom:30px}.course-sidebar{padding-right:18px;border-right:1px solid var(--line);font-size:11px}.sidebar-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px}.sidebar-top>a{font-size:18px;min-width:34px;min-height:34px;display:grid;place-items:center;color:var(--accent)}.sidebar-heading{font-size:10px;letter-spacing:.12em;color:var(--muted);font-weight:600}.sidebar-section{border-bottom:1px solid var(--line);padding:8px 0}.sidebar-section summary{font-size:10px;line-height:1.8;cursor:pointer;padding:9px 16px 9px 0;position:relative;list-style:none;color:var(--muted)}.sidebar-section summary::-webkit-details-marker{display:none}.sidebar-section summary:after{content:'+';position:absolute;right:1px;top:9px;font-size:13px;color:var(--faint)}.sidebar-section[open] summary:after{content:'−'}.sidebar-section[open] summary{color:var(--ink);font-weight:600}.sidebar-section a{display:block;padding:9px 10px 10px 12px;line-height:1.8;color:var(--muted);border-left:2px solid transparent;margin:3px 0}.sidebar-section a>span{display:block;font-size:8px;color:var(--faint);line-height:1.5;margin-bottom:2px}.sidebar-section a:hover{background:var(--soft);color:var(--ink)}.sidebar-section a[aria-current=page]{border-left-color:var(--accent);background:var(--soft);color:var(--accent)}.reader-main{min-width:0;padding-top:36px}.reader-header .breadcrumb{margin-bottom:27px;font-size:9px}.reader-header h1{font-size:37px;line-height:1.6;margin:13px 0 15px;letter-spacing:.025em}.reader-meta{display:flex;flex-wrap:wrap;gap:0;font-size:10px;color:var(--muted);align-items:center;line-height:1.9}.reader-meta>span+span:before{content:'·';margin:0 12px;color:var(--line-dark)}.reader-summary{font-size:14px;line-height:2;margin-top:22px;color:var(--muted)}.source-note{border-left:2px solid var(--line-dark);padding:8px 12px;margin:20px 0 0;font-size:11px;line-height:1.9;color:var(--muted);background:var(--soft)}.reader-actions{margin-top:28px;display:flex;justify-content:space-between;align-items:center;gap:12px;border-bottom:1px solid var(--line)}.reader-tabs{display:flex;gap:22px;align-items:center}.reader-tabs a{min-height:48px;display:flex;align-items:center;font-size:11px;color:var(--muted);gap:5px;white-space:nowrap}.reader-tabs a:first-child{color:var(--accent);border-bottom:2px solid var(--accent)}.reader-tabs a:hover{color:var(--accent)}.reader-tabs svg{width:13px;height:13px}.bookmark-button{min-height:44px;padding:8px 0 8px 8px;display:flex;align-items:center;gap:5px;color:var(--muted);font-size:10px}.bookmark-button svg{width:16px;height:16px}.bookmark-button[aria-pressed=true]{color:var(--accent)}.bookmark-button[aria-pressed=true] svg{fill:var(--sage)}.reader-tools{display:flex;align-items:center;gap:18px;border-bottom:1px solid var(--line);background:var(--paper);position:sticky;top:76px;z-index:25;min-height:53px}.reader-mode-buttons{display:flex;gap:14px}.reader-mode-buttons button{min-height:44px;display:flex;align-items:center;gap:5px;font-size:10px;color:var(--muted);padding:6px 0}.reader-mode-buttons svg{width:15px;height:15px}.reader-mode-buttons button[aria-pressed=true]{color:var(--accent);font-weight:600}.reader-mode-buttons button:hover{color:var(--accent)}.reading-settings{position:relative;margin-left:auto}.reading-settings summary{display:flex;align-items:center;gap:6px;font-size:10px;min-height:44px;cursor:pointer;color:var(--muted);list-style:none}.reading-settings summary::-webkit-details-marker{display:none}.reading-settings summary svg{width:15px;height:15px}.settings-panel{position:absolute;top:47px;right:0;background:var(--surface);box-shadow:var(--shadow);border:1px solid var(--line);border-radius:4px;min-width:250px;padding:20px;z-index:26;display:grid;gap:15px}.settings-panel>label{display:flex;justify-content:space-between;align-items:center;gap:15px;font-size:12px}.settings-panel select{background:var(--surface);border:1px solid var(--line);padding:8px 10px;min-height:42px;font-size:12px;min-width:140px}.settings-panel>.quiet-button{min-height:44px;font-size:11px}.tools-classroom{display:flex;align-items:center;gap:5px;color:var(--accent);font-size:10px;min-height:44px;margin-left:0}.tools-classroom svg{width:13px;height:13px}.lesson-overview{margin-top:30px;padding:28px 30px;background:var(--soft);scroll-margin-top:150px}.overview-deck{font-family:var(--serif);font-size:18px;line-height:1.95;margin-top:14px}.objectives{border-top:1px solid var(--line-dark);padding-top:20px;margin-top:20px}.objectives h2{font-size:11px;color:var(--muted);font-weight:500}.objectives ol{list-style:none;padding:0;margin:11px 0 0;display:grid;gap:8px}.objectives li{font-size:12px;line-height:1.9;display:flex;gap:12px;align-items:flex-start}.objectives li>span{font-size:9px;color:var(--accent);line-height:2.6}.mobile-reader-bar{display:none}.mobile-toc{display:none}.reading-start{display:flex;justify-content:space-between;gap:20px;color:var(--faint);font-size:9px;letter-spacing:.04em;padding:39px 0 19px;border-bottom:1px solid var(--line);scroll-margin-top:140px}.lesson-body{font-family:var(--serif);font-size:var(--reader-font-size);line-height:var(--reader-line-height);overflow-wrap:break-word}.chapter-section{padding-top:39px;scroll-margin-top:140px;display:flow-root}.chapter-section h2{font-family:var(--serif);font-size:1.28em;line-height:1.7;font-weight:500;margin:0 0 27px;letter-spacing:.01em}.chapter-section h3{font-family:var(--serif);font-size:1.08em;line-height:1.7;font-weight:600;margin:1.6em 0 .9em}.chapter-section p{margin:0 0 1.25em;text-align:justify}.chapter-section ul,.chapter-section ol{margin:1.1em 0 1.5em;padding-left:1.5em}.chapter-section li{margin:.55em 0}.lesson-body a{color:var(--accent);text-decoration:underline;text-decoration-color:var(--line-dark);overflow-wrap:anywhere}.lesson-body a:hover{text-decoration-color:var(--accent)}.lesson-body sup{font-size:10px;vertical-align:super}.lesson-body blockquote{margin:1.5em 0;padding:10px 0 10px 22px;border-left:3px solid var(--line-dark);color:var(--muted)}.lesson-body strong{font-weight:600}.lesson-body .figure{margin:28px auto 30px;clear:both}.lesson-body .figure img{margin:auto;background:#fff;border:1px solid var(--line);max-height:none;cursor:zoom-in}.lesson-body .figure.portrait{max-width:355px}.lesson-body .figure.portrait img{width:100%;height:auto}.lesson-body .figure.diagram{width:100%;background:transparent}.lesson-body .figure.diagram img{width:100%;height:auto}.lesson-body .figure.illustration{max-width:650px}.lesson-body figcaption{font-family:var(--sans);color:var(--muted);font-size:10px;line-height:1.9;text-align:left;margin-top:11px;padding:0 2px}.lesson-body .references,.lesson-body .exercises{font-family:var(--sans);font-size:12px;color:var(--muted);padding-top:35px;margin-top:30px;border-top:1px solid var(--line);line-height:2}.lesson-body .references h2,.lesson-body .exercises h2{font-family:var(--serif);font-size:22px;color:var(--ink)}.lesson-body .references p,.lesson-body .exercises p{text-align:left}.lesson-body .references li,.lesson-body .exercises li{margin:12px 0}.lesson-body .classroom-inline{font-family:var(--sans);font-size:10px;margin:-13px 0 24px;text-align:left}.classroom-inline a{display:inline-flex;align-items:center;gap:7px;min-height:36px;color:var(--accent);text-decoration:none;border-bottom:1px solid var(--line-dark)}.classroom-inline svg{width:12px;height:12px}.classroom-inline a:hover{border-color:var(--accent)}.lesson-body table{display:block;max-width:100%;overflow-x:auto;border-collapse:collapse;font-family:var(--sans);font-size:.7em;line-height:1.8;margin:25px 0}.lesson-body th,.lesson-body td{padding:10px 14px;border:1px solid var(--line);text-align:left;min-width:80px}.lesson-body th{background:var(--soft)}.toc-sidebar{padding-left:2px}.toc-sidebar .sidebar-heading{margin-bottom:20px}#toc{display:grid;gap:2px}#toc>a{font-size:10px;line-height:1.9;color:var(--muted);padding:6px 0 6px 12px;border-left:1px solid var(--line)}#toc>a:hover{color:var(--accent)}#toc>a.active,#toc>a[aria-current=true],#toc>a[aria-current=location]{color:var(--accent);border-left:2px solid var(--accent);background:var(--soft)}.toc-footer{border-top:1px solid var(--line);padding-top:20px;margin-top:25px;font-size:10px;line-height:2;color:var(--muted)}.toc-footer a{color:var(--accent);display:inline-block;min-height:32px}.toc-footer p{margin-top:10px}.takeaways-section{margin-top:50px;border-top:1px solid var(--line-dark);padding-top:38px;scroll-margin-top:145px}.takeaways-section>h2{font-size:28px;margin-top:12px}.takeaways-section>ol{padding:0;list-style:none;margin:25px 0 0}.takeaways-section>ol>li{display:flex;gap:20px;padding:17px 0;border-bottom:1px solid var(--line)}.takeaways-section li>span{font-family:var(--serif);font-size:20px;color:var(--faint);line-height:1.5;min-width:28px}.takeaways-section li>p{font-family:var(--serif);font-size:17px;line-height:1.95}.practice-section{padding:32px;margin-top:55px;background:var(--soft-blue);scroll-margin-top:140px}.practice-heading{display:flex;justify-content:space-between;gap:15px;align-items:center}.practice-heading h2{font-size:26px;margin-top:13px;line-height:1.6}.practice-heading .eyebrow{font-size:8px}.practice-time{font-size:10px;white-space:nowrap;border:1px solid var(--line-dark);padding:6px 9px;color:var(--muted)}.practice-prompt{font-family:var(--serif);font-size:17px;line-height:1.9;margin-top:23px}.practice-steps{padding:0;list-style:none;margin:23px 0 30px;display:grid;gap:13px}.practice-steps>li{display:flex;gap:16px;font-size:12px;line-height:1.95}.practice-steps>li>span{font-size:9px;color:var(--accent);width:24px;height:24px;border:1px solid var(--line-dark);border-radius:50%;display:grid;place-items:center;flex:none;margin-top:1px}.practice-writing{border-top:1px solid var(--line-dark);padding-top:24px}.practice-writing>label{font-size:13px;font-weight:600}.practice-writing>p{font-size:10px;line-height:1.9;color:var(--muted);margin-top:7px}.practice-writing textarea{width:100%;resize:vertical;min-height:180px;max-height:70vh;background:var(--surface);border:1px solid var(--line-dark);border-radius:3px;padding:17px 19px;font-size:13px;line-height:1.95;margin-top:15px}.practice-checklist{margin:22px 0 0;border:0;padding:0}.practice-checklist legend{font-size:11px;font-weight:600;margin-bottom:10px}.practice-checklist>label{display:flex;align-items:flex-start;gap:11px;min-height:37px;font-size:11px;line-height:1.9;cursor:pointer;padding:6px 0}.practice-checklist input{appearance:auto;accent-color:var(--accent);width:16px;height:16px;flex:none;margin:2px 0 0}.note-actions{display:flex;align-items:center;flex-wrap:wrap;gap:11px;margin-top:21px}.note-actions .button,.note-actions .quiet-button{font-size:11px;min-height:44px;padding:10px 18px}.note-actions .button svg{width:15px;height:15px}.note-actions #note-status{font-size:10px;color:var(--muted);flex-basis:100%;line-height:1.8;min-height:18px;margin-top:2px}.practice-link{display:flex;align-items:center;justify-content:space-between;gap:20px;border:1px solid var(--line-dark);padding:18px 20px;background:transparent;margin-top:29px;color:var(--accent)}.practice-link strong{font-size:12px;display:block}.practice-link span{font-size:10px;color:var(--muted);display:block;margin-top:5px}.practice-link svg{width:17px;height:17px}.practice-link:hover{background:var(--surface)}.related-section{margin-top:55px;scroll-margin-top:140px}.related-section .section-heading h2{font-size:25px;line-height:1.65}.related-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}.related-card{border:1px solid var(--line);padding:24px 24px 20px;display:flex;flex-direction:column;align-items:flex-start;position:relative}.related-card .eyebrow{font-size:9px}.related-card h3{font-family:var(--serif);font-size:20px;line-height:1.7;margin-top:12px}.related-card>p{font-size:11px;color:var(--muted);line-height:1.95;margin-top:11px}.related-arrow{font-size:20px;color:var(--accent);align-self:flex-end;margin-top:17px;line-height:1}.related-card:hover{background:var(--soft);border-color:var(--line-dark)}.lesson-end{margin-top:45px}.complete-line{display:flex;justify-content:space-between;gap:20px;align-items:center;border-top:1px solid var(--line);padding-top:30px}.complete-line p:not(.eyebrow){font-family:var(--serif);font-size:17px;line-height:1.8;margin-top:7px}.complete-line .eyebrow{font-size:8px}.lesson-navigation{margin-top:32px;padding-top:24px}.lesson-navigation strong{font-size:17px}.back-top{position:fixed;bottom:25px;right:25px;background:var(--surface);border:1px solid var(--line);box-shadow:var(--shadow);z-index:35;width:44px;height:44px}.back-top:hover{background:var(--soft)}.back-top svg{width:18px;height:18px}.focus-reading .course-sidebar,.focus-reading .toc-sidebar{display:none}.focus-reading .reader-shell{grid-template-columns:minmax(0,760px);max-width:900px}.focus-reading .reader-main{padding-top:36px}.focus-reading .reader-header h1{font-size:41px}.text-only .lesson-body figure{display:none}.text-only .reading-start .js-only{visibility:hidden}.text-only .chapter-section{padding-top:29px}.text-only .chapter-section h2{margin-bottom:22px}.text-only .chapter-section:first-child{padding-top:37px}
/* Modal reader tools */
.drawer-scrim{position:fixed;inset:0;background:rgba(9,24,17,.45);backdrop-filter:blur(2px);z-index:100}.course-drawer{position:fixed;z-index:101;top:0;bottom:0;left:0;width:min(86vw,370px);background:var(--surface);padding:22px 26px 40px;overflow-y:auto;overscroll-behavior:contain;box-shadow:var(--shadow)}.drawer-top{display:flex;justify-content:space-between;align-items:center;padding-bottom:20px;border-bottom:1px solid var(--line);font-family:var(--serif);font-size:23px}.course-drawer .sidebar-section summary{font-size:12px;padding-top:13px;padding-bottom:13px}.course-drawer .sidebar-section summary:after{top:13px}.course-drawer .sidebar-section a{font-size:13px;min-height:44px;padding-top:10px;padding-bottom:10px}.course-drawer .sidebar-section a>span{font-size:10px}.image-dialog{border:0;background:var(--surface);color:var(--ink);padding:18px 24px 20px;max-width:min(95vw,1350px);max-height:94dvh;width:fit-content;min-width:min(400px,94vw);overflow:hidden;border-radius:5px;box-shadow:var(--shadow)}dialog::backdrop{background:rgba(11,25,18,.7);backdrop-filter:blur(4px)}.dialog-toolbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:7px}.dialog-toolbar>span{font-size:11px;color:var(--muted)}.dialog-image-wrap{display:flex;align-items:center;gap:12px;justify-content:center;position:relative}.dialog-image-wrap>img{max-height:calc(94dvh - 160px);width:auto;max-width:calc(95vw - 180px);object-fit:contain;background:#fff}.image-prev,.image-next{flex:none;border:1px solid var(--line);font-size:21px;background:var(--surface)}#dialog-caption{font-size:11px;line-height:1.8;color:var(--muted);max-width:900px;text-align:center;margin:15px auto 0;max-height:60px;overflow-y:auto}.classroom-dialog{width:min(1260px,96vw);height:min(940px,94dvh);max-height:94dvh;max-width:96vw;padding:0;border:1px solid var(--line);background:var(--surface);color:var(--ink);border-radius:5px;overflow:hidden;box-shadow:var(--shadow)}.classroom-dialog[open]{display:flex;flex-direction:column}.classroom-dialog-header{display:flex;justify-content:space-between;align-items:center;padding:15px 24px;border-bottom:1px solid var(--line);flex:none}.classroom-dialog-header .eyebrow{font-size:8px}.classroom-dialog-header h2{font-family:var(--serif);font-size:20px;margin-top:4px}.classroom-dialog iframe{display:block;width:100%;min-height:0;flex:1;border:0;background:#f8faf8}.classroom-dialog-footer{display:flex;justify-content:space-between;gap:20px;padding:10px 24px;align-items:center;border-top:1px solid var(--line);font-size:10px;color:var(--muted);flex:none}.classroom-dialog-footer a{min-height:30px;display:flex;align-items:center;color:var(--accent)}
/* Search and concept index */
.search-main{max-width:1000px;min-height:640px}.search-main .page-intro{max-width:800px}.search-form{display:flex;gap:12px}.search-input-wrap{position:relative;flex:1;min-width:0}.search-input-wrap>svg{position:absolute;left:18px;top:18px;width:20px;height:20px;color:var(--muted)}.search-input-wrap>input{width:100%;min-height:56px;padding-left:51px;font-size:14px}.search-form>.button{min-width:104px}.search-filters{display:flex;gap:25px;align-items:center;margin-top:18px;flex-wrap:wrap}.search-filters>label{display:flex;gap:9px;align-items:center;color:var(--muted);font-size:11px}.search-filters select{font-size:11px;min-height:44px;padding:8px 12px;max-width:240px}.search-filters .quiet-button{font-size:11px;min-height:44px;padding:8px 13px;margin-left:auto}.search-main>.search-info{margin-top:26px;padding-bottom:20px;border-bottom:1px solid var(--line)}.search-results{margin-top:12px}.search-result{padding:27px 0;border-bottom:1px solid var(--line)}.result-meta{font-size:10px;color:var(--muted);line-height:1.8;display:flex;gap:10px;flex-wrap:wrap}.search-result h2{font-family:var(--serif);font-size:24px;line-height:1.6;margin:9px 0 12px}.search-result h2>a:hover{text-decoration:underline;text-decoration-thickness:1px}.search-result p,.result-excerpt{font-size:13px;line-height:2;color:var(--muted)}.result-section{display:inline-flex;color:var(--accent);font-size:11px;min-height:35px;align-items:center;margin-top:10px}.result-section:hover{text-decoration:underline}.search-result mark{background:var(--sage);color:var(--ink);padding:1px 2px;font-weight:500}.search-empty,.empty-state{padding:45px 30px;text-align:center;background:var(--soft);font-size:13px;line-height:2;color:var(--muted);margin-top:20px}.search-empty a,.empty-state a{color:var(--accent);text-decoration:underline}.search-suggestions{display:flex;gap:11px;align-items:center;flex-wrap:wrap;margin-top:32px;color:var(--muted);font-size:11px}.search-suggestions>span{margin-right:12px}.search-suggestions a{display:inline-flex;align-items:center;padding:6px 11px;border:1px solid var(--line);min-height:33px;color:var(--accent)}.search-suggestions a:hover{background:var(--soft)}.glossary-search{max-width:600px;margin:0 0 30px}.glossary-search .input{width:100%;font-size:13px}.glossary-search .search-info{margin-top:12px}.glossary-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 52px;border-top:1px solid var(--line)}.glossary-entry{padding:32px 0 30px 40px;border-bottom:1px solid var(--line);position:relative}.concept-number{position:absolute;left:0;top:36px;font-family:var(--serif);font-size:16px;color:var(--faint)}.glossary-entry h2{font-family:var(--serif);font-size:25px;line-height:1.5}.glossary-entry>p{font-size:13px;line-height:2.05;color:var(--muted);margin-top:16px}.concept-lessons{margin-top:23px;font-size:10px;display:grid;gap:6px}.concept-lessons>span{color:var(--faint);font-size:9px}.concept-lessons>a{display:flex;justify-content:space-between;gap:12px;color:var(--accent);line-height:1.9;min-height:30px;align-items:center}.concept-lessons>a:hover{text-decoration:underline}.concept-lessons>a>span{flex:none}.index-footnote{font-size:11px;line-height:2;color:var(--muted);padding-top:27px;max-width:750px}
/* The personal study desk */
.workspace-intro{display:flex;gap:30px;justify-content:space-between;align-items:flex-end;max-width:none}.workspace-intro h1{font-size:39px}.workspace-intro>div>p:not(.eyebrow){font-size:13px;color:var(--muted);margin-top:18px;line-height:1.9}.workspace-intro>.button{flex:none;max-width:300px;font-size:12px}.workspace-overview{display:grid;grid-template-columns:1.1fr 1fr;gap:80px;padding:32px 40px;background:var(--soft)}.workspace-progress-label{font-size:12px;display:flex;align-items:baseline;gap:9px;color:var(--muted);margin-top:13px;line-height:1.5}.workspace-progress-label strong{font-family:var(--serif);font-size:42px;font-weight:400;color:var(--ink)}.workspace-meter{height:4px;background:var(--line-dark);margin-top:14px}.workspace-meter>span{height:100%;display:block;background:var(--accent)}#workspace-progress>p:not(.workspace-progress-label){font-size:10px;color:var(--muted);margin-top:12px}.workspace-local-note{display:flex;gap:15px;align-items:flex-start;align-self:center;padding-left:25px;border-left:1px solid var(--line-dark)}.local-dot{width:7px;height:7px;border-radius:50%;background:var(--accent);flex:none;margin-top:9px}.workspace-local-note h2{font-size:14px;line-height:1.9}.workspace-local-note p{font-size:11px;line-height:1.95;color:var(--muted);margin-top:10px;max-width:330px}.workspace-jump{display:flex;gap:32px;border-bottom:1px solid var(--line);margin-top:25px}.workspace-jump a{display:flex;align-items:center;min-height:53px;font-size:11px;color:var(--muted)}.workspace-jump a:hover{color:var(--accent)}.workspace-grid{display:grid;grid-template-columns:1fr 1fr;gap:48px}.workspace-section{margin-top:50px;scroll-margin-top:30px}.workspace-section .section-heading{margin-bottom:24px}.workspace-section .section-heading h2{font-size:28px}.workspace-section .eyebrow{font-size:9px}.workspace-section .subtle-link{font-size:10px}.workspace-empty{border:1px solid var(--line);padding:32px 30px;background:var(--surface)}.empty-symbol{font-family:var(--serif);font-size:26px;color:var(--faint);display:block;margin-bottom:16px;line-height:1}.empty-symbol svg{width:25px;height:25px}.workspace-empty h3{font-family:var(--serif);font-size:20px;line-height:1.7}.workspace-empty p{font-size:11px;line-height:1.95;color:var(--muted);margin-top:11px}.workspace-empty a{display:inline-flex;min-height:36px;align-items:center;font-size:11px;color:var(--accent);margin-top:13px}.workspace-list{list-style:none;margin:0;padding:0}.workspace-item{border-bottom:1px solid var(--line);padding:20px 0;display:flex;justify-content:space-between;gap:14px;align-items:center}.workspace-item:first-child{border-top:1px solid var(--line)}.workspace-item a{display:block}.workspace-item h3,.workspace-item strong{font-family:var(--serif);font-size:18px;font-weight:400;line-height:1.7}.workspace-item p,.workspace-item small,.workspace-item span{font-size:10px;color:var(--muted);line-height:1.9}.workspace-item .quiet-button{font-size:10px;min-height:44px;padding:7px 13px;flex:none}.workspace-item a:hover strong,.workspace-item a:hover h3{color:var(--accent)}.notes-section{margin-top:60px}.workspace-note{border:1px solid var(--line);padding:26px 30px;background:var(--surface);margin-top:16px}.workspace-note h3{font-family:var(--serif);font-size:21px;line-height:1.7}.workspace-note header,.workspace-note-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:20px}.workspace-note p,.workspace-note time,.workspace-note small{font-size:11px;color:var(--muted);line-height:1.9}.workspace-note pre,.workspace-note-text{font-family:var(--sans);font-size:13px;line-height:2;color:var(--ink);white-space:pre-wrap;overflow-wrap:anywhere;padding:20px 0;border-top:1px solid var(--line);margin:18px 0 0}.workspace-note .quiet-button{font-size:11px;min-height:44px;padding:8px 15px}.workspace-note-actions{display:flex;gap:10px;flex-wrap:wrap}.workspace-note a{color:var(--accent)}.workspace-note>p{margin-top:8px}.backup-section{display:grid;grid-template-columns:1fr 1fr;gap:65px;background:var(--soft-blue);padding:40px 42px;margin-top:65px;scroll-margin-top:30px}.backup-section h2{font-size:28px;line-height:1.6;margin-top:13px}.backup-section>div>p:not(.eyebrow){font-size:12px;color:var(--muted);line-height:2;max-width:450px;margin-top:18px}.backup-controls{display:flex;gap:12px;flex-wrap:wrap;align-content:start}.backup-controls>.button,.backup-controls>.quiet-button{font-size:12px}.file-upload{cursor:pointer;position:relative}.file-upload input{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}.file-upload:focus-within{outline:2px solid var(--accent);outline-offset:4px}.backup-controls #workspace-status{flex-basis:100%;font-size:11px;line-height:1.9;color:var(--muted);margin:0;min-height:22px}.import-preview{flex-basis:100%;padding:20px;background:var(--surface);border:1px solid var(--line-dark);font-size:12px;line-height:1.9}.import-actions{display:flex;gap:10px;margin-top:15px}.import-actions .button,.import-actions .quiet-button{font-size:11px;min-height:44px;padding:9px 15px}.data-reset{flex-basis:100%;font-size:11px;border-top:1px solid var(--line-dark);margin-top:8px;padding-top:10px;color:var(--muted)}.data-reset summary{cursor:pointer;min-height:35px;display:flex;align-items:center}.data-reset summary:after{content:'+';margin-left:auto}.data-reset[open] summary:after{content:'−'}.data-reset p{font-size:11px;line-height:1.95;margin-top:6px}.danger-button{font-size:11px;min-height:44px;border:1px solid #a98779;color:#8d5645;padding:8px 15px;margin-top:15px}.danger-button:hover{background:var(--surface)}html[data-theme=dark] .danger-button{color:#e4b49e;border-color:#805c4e}
/* Medium screens */
@media(min-width:1600px){.reader-shell{gap:60px}.hero{column-gap:85px}}
@media(max-width:1220px){.header-inner{padding:0 35px;gap:30px}.header-nav{gap:25px}.site-main{width:calc(100% - 70px)}.footer-inner{margin:0 35px}.hero{column-gap:50px;min-height:625px}.hero-copy{padding-top:30px}.hero-visual{height:540px}.hero h1{font-size:52px}.hero-subtitle{font-size:17px}.reader-shell{grid-template-columns:180px minmax(0,700px) 150px;gap:30px;padding:0 25px}.reader-header h1{font-size:32px}.reader-tabs{gap:17px}.reader-tabs a{font-size:10px}.reader-tools{gap:15px}.tools-classroom{font-size:9px}.lesson-overview{padding:25px}.course-sidebar{padding-right:13px}.sidebar-section summary{font-size:9px}.toc-sidebar #toc>a{font-size:9px}.practice-section{padding:25px}.practice-heading h2{font-size:24px}.unit-card h3{font-size:20px}.unit-card-main{gap:12px;grid-template-columns:36px 1fr 18px}.unit-card .unit-progress{margin-left:48px}.closing-panel{padding:46px;gap:45px}.closing-quote{padding-left:35px}.workspace-intro{display:block}.workspace-intro .button{margin-top:24px}.catalog-toolbar{grid-template-columns:1fr 190px 130px auto}.catalog-grid{gap:40px 32px}}
@media(max-width:1050px){.header-inner{gap:25px}.header-nav{gap:20px}.hero{column-gap:37px}.hero h1{font-size:46px}.hero-description{font-size:12px}.hero-visual{height:505px}.hero-credits{font-size:9px;gap:15px;margin-top:28px}.hero-credits span+span{padding-left:15px}.hero-image-label{left:22px;right:22px}.hero-image-label small{display:none}.hero-visual figcaption{left:22px}.hero-actions{gap:20px}.hero-actions .button{padding:12px 18px;font-size:12px}.hero-copy{padding-bottom:30px}.hero-bottom{margin-top:24px}.hero{min-height:0}.find-card{padding:28px}.continue-card{padding:28px}.learning-hub{grid-template-columns:1fr 1.25fr}.section-heading h2{font-size:28px}.section-heading .section-description{max-width:240px;font-size:11px}.study-steps>a{padding-left:25px;padding-right:25px}.study-steps h3{font-size:15px}.extension-grid{gap:18px}.extension-item h3{font-size:17px}.extension-summary{font-size:10px}.closing-panel h2{font-size:31px}.closing-quote blockquote{font-size:21px}.reader-shell{grid-template-columns:180px minmax(0,720px);gap:35px;max-width:1030px}.toc-sidebar{display:none}.mobile-toc{display:block;border-bottom:1px solid var(--line);margin-top:22px;font-size:12px}.mobile-toc summary{cursor:pointer;list-style:none;min-height:48px;display:flex;align-items:center;justify-content:space-between;color:var(--accent)}.mobile-toc summary::-webkit-details-marker{display:none}.mobile-toc summary:after{content:'+';margin-left:15px;font-size:17px;color:var(--muted)}.mobile-toc[open] summary:after{content:'−'}.mobile-toc summary>span{color:var(--faint);font-size:9px;margin-left:auto}.mobile-toc nav{display:grid;grid-template-columns:1fr 1fr;gap:7px 20px;padding-bottom:22px}.mobile-toc nav>a{font-size:11px;line-height:1.9;padding:7px 0;color:var(--muted)}.mobile-toc nav>a:hover{color:var(--accent)}.reader-header h1{font-size:35px}.reader-tabs a{font-size:11px}.reader-tools{gap:22px}.tools-classroom{font-size:10px}.overview-deck{font-size:18px}.catalog-grid{grid-template-columns:1fr;gap:40px}.catalog-group-heading h2{font-size:25px}.course-row{grid-template-columns:70px 1fr 60px 20px}.course-name{font-size:15px}.course-num{font-size:10px}.course-duration{font-size:10px}.catalog-toolbar{grid-template-columns:1fr 180px 125px;gap:12px}.catalog-summary{grid-column:1/-1;padding:4px 0 0;text-align:right}.essay-layout{grid-template-columns:150px minmax(0,700px);gap:45px}.essay-body>h1{font-size:35px}.workspace-overview{gap:45px;padding:30px}.workspace-grid{gap:30px}.workspace-empty{padding:25px}.backup-section{gap:35px;padding:34px}.glossary-grid{gap:0 35px}.glossary-entry{padding-left:33px}.glossary-entry>p{font-size:12px}.unit-hero{gap:35px}.unit-hero h1{font-size:36px}.unit-index-art>span{font-size:85px}.unit-index-art>div{font-size:7px}.unit-learning-line{gap:35px}.unit-lessons .course-row{gap:22px;grid-template-columns:70px 1fr 60px 20px}.course-row-detailed .course-name{font-size:21px}}
@media(max-width:820px){:root{--header-height:80px}.site-main{width:calc(100% - 48px)}.header-inner{padding:0 24px;gap:20px}.brand-text{font-size:20px}.brand small{font-size:6px}.brand-mark{width:25px}.header-nav{gap:18px}.header-nav a{font-size:11px}.header-actions{gap:5px}.search-link>span{display:none}.search-link{width:37px;justify-content:center}.hero{padding-top:30px;column-gap:27px}.hero-copy{padding-top:20px}.hero h1{font-size:39px;line-height:1.5}.hero-copy .eyebrow{font-size:9px;margin-bottom:22px}.hero-subtitle{font-size:15px;line-height:1.9;margin-top:20px}.hero-description{font-size:11px;line-height:2}.hero-visual{height:465px}.hero-actions{gap:14px;margin-top:24px}.hero-actions .button{min-height:45px;font-size:11px;padding:11px 14px;gap:14px}.hero-actions .text-link{font-size:10px;gap:7px}.hero-credits{display:block;font-size:9px;line-height:1.9;margin-top:22px}.hero-credits span{display:block}.hero-credits span+span{border:0;padding:0}.hero-image-label{left:18px;right:18px;bottom:40px}.hero-image-label>span{font-size:12px}.hero-visual figcaption{left:18px;bottom:16px;font-size:7px}.hero-bottom{font-size:10px;margin-top:20px;padding:17px 0}.learning-hub{margin-top:30px;grid-template-columns:1fr 1.25fr}.continue-card,.find-card{padding:25px}.continue-card h2{font-size:23px}.continue-card .eyebrow,.find-card .eyebrow{font-size:9px}.find-card h2{font-size:20px}.quick-search input{font-size:11px}.keyword-links a{font-size:9px;padding:6px 8px}.home-section{margin-top:75px}.section-heading{gap:25px;margin-bottom:26px}.section-heading h2{font-size:25px}.section-heading .section-description{max-width:210px;font-size:10px}.section-heading .eyebrow{font-size:9px}.section-heading p:not(.eyebrow){font-size:11px}.study-steps>a{padding:25px 20px}.study-steps h3{font-size:14px;line-height:1.8;margin-top:20px}.study-steps p{font-size:11px}.step-link{font-size:10px;margin-top:16px}.unit-card{padding:24px 20px 20px 0}.unit-card:nth-child(even){padding-left:20px}.unit-card-main{grid-template-columns:28px 1fr 16px;gap:10px}.unit-no{font-size:21px}.unit-card h3{font-size:18px}.unit-description{font-size:10px}.unit-range{font-size:8px}.unit-card .unit-progress{margin-left:38px}.unit-progress-label{font-size:8px}.extension-grid{grid-template-columns:repeat(2,1fr);gap:28px 23px}.extension-item h3{font-size:19px}.extension-summary{font-size:11px}.image-wrap{aspect-ratio:4/4.5}.closing-panel{margin-top:75px;padding:36px;gap:30px}.closing-panel h2{font-size:28px}.closing-panel>div>p:not(.eyebrow){font-size:11px}.closing-quote{padding-left:25px}.closing-quote blockquote{font-size:18px}.closing-quote>p{font-size:9px!important}.closing-panel .eyebrow{font-size:8px}.footer-inner{margin:0 24px;padding:45px 0;gap:8%}.site-footer{margin-top:85px}.footer-title{font-size:23px}.footer-inner p{font-size:10px}.footer-links{gap:7px 18px}.footer-links a{font-size:10px}.reader-shell{grid-template-columns:minmax(0,720px);max-width:790px;padding:0 30px;gap:0}.course-sidebar{display:none}.reader-main{padding-top:0}.mobile-reader-bar{display:flex;align-items:center;gap:20px;border-bottom:1px solid var(--line);margin-bottom:27px;min-height:51px;font-size:10px;color:var(--muted)}.mobile-reader-bar>button{display:flex;align-items:center;gap:6px;padding:6px 0;min-height:44px;font-size:10px;color:var(--accent)}.mobile-reader-bar svg{width:14px;height:14px}.mobile-reader-bar>a{display:flex;align-items:center;min-height:44px}.mobile-reader-bar>a:last-child{margin-left:auto}.reader-header .breadcrumb{margin-bottom:24px}.reader-header h1{font-size:35px}.reader-header .eyebrow{font-size:9px}.reader-tabs a{font-size:12px}.reader-tools{gap:20px}.reader-mode-buttons{gap:20px}.reader-mode-buttons button,.reading-settings summary,.tools-classroom{font-size:11px}.lesson-overview{margin-top:26px;padding:26px 29px}.overview-deck{font-size:19px}.objectives li{font-size:12px}.objectives h2{font-size:11px}.focus-reading .reader-main{padding-top:0}.focus-reading .reader-header h1{font-size:35px}.page-intro{padding-top:55px}.page-intro h1{font-size:36px}.page-intro>p:not(.eyebrow){font-size:13px}.unit-hero{grid-template-columns:1fr 180px;gap:25px}.unit-hero h1{font-size:31px}.unit-deck{font-size:13px}.unit-index-art>span{font-size:73px}.unit-learning-line p{font-size:11px}.unit-learning-line .unit-progress-label{font-size:10px}.unit-lessons{margin-top:50px}.course-row-detailed .course-name{font-size:20px}.essay-layout{grid-template-columns:1fr;margin-top:50px;gap:30px;max-width:680px}.essay-aside{border-bottom:1px solid var(--line);padding:0 0 20px;display:flex;align-items:flex-start;justify-content:space-between;gap:20px;font-size:10px}.essay-aside>.eyebrow{display:none}.essay-aside>p+p{margin-top:0}.essay-aside>a{margin-top:0}.essay-body>h1{font-size:36px}.prose{font-size:19px}.about-grid{gap:35px}.about-grid>section{padding-left:30px}.about-grid h2{font-size:18px}.about-grid p{font-size:12px}.workspace-intro h1{font-size:34px}.workspace-overview{gap:25px;padding:28px}.workspace-local-note{padding-left:22px;gap:10px}.workspace-local-note h2{font-size:12px}.workspace-local-note p{font-size:10px}.workspace-empty{padding:24px}.workspace-empty h3{font-size:18px}.workspace-grid{gap:25px}.workspace-section .section-heading h2{font-size:26px}.workspace-section .eyebrow{font-size:8px}.backup-section{grid-template-columns:1fr;gap:28px}.backup-section>div>p:not(.eyebrow){max-width:600px}.backup-controls{max-width:600px}.data-reset{margin-top:0}}
/* Mobile: controls are intentionally generous; navigation stays reachable. */
@media(max-width:640px){:root{--header-height:74px}.header-inner{padding:0 20px;gap:12px;justify-content:space-between}.brand{gap:9px}.brand-mark{width:22px;height:31px}.brand-text{font-size:19px;letter-spacing:.1em}.brand small{font-size:5.8px;letter-spacing:.11em}.header-nav{display:none}.global-menu-toggle{display:inline-flex}.header-actions{gap:1px}.header-actions .icon-button{width:44px;min-width:44px}.header-actions .search-link{width:38px;min-height:44px}.header-actions .search-link svg{width:18px}.header-actions #theme-toggle svg{width:19px}.no-js .header-nav{display:flex;position:absolute;top:74px;left:0;right:0;padding:0 20px;justify-content:space-between;min-height:49px;border-top:1px solid var(--line);background:var(--paper);gap:10px}.no-js .site-header{margin-bottom:49px}.site-main{width:calc(100% - 40px)}.hero{grid-template-columns:1fr;gap:0;padding-top:0}.hero-copy{padding:37px 0 31px}.hero-copy .eyebrow{font-size:9px;margin-bottom:22px}.hero h1{font-size:45px;line-height:1.42;letter-spacing:.07em}.hero-subtitle{font-size:17px;line-height:1.8;margin-top:23px}.hero-description{font-size:12px;line-height:2;max-width:420px;margin-top:12px}.hero-actions{gap:24px;margin-top:27px}.hero-actions .button{font-size:12px;min-height:48px;padding:12px 19px;gap:18px}.hero-actions .text-link{font-size:12px;gap:12px}.hero-credits{display:flex;gap:14px;margin-top:25px;font-size:9px;flex-wrap:wrap}.hero-credits span+span{border-left:1px solid var(--line-dark);padding-left:14px}.hero-visual{height:auto;aspect-ratio:1.13/1;width:100%}.hero-visual>img{object-position:center 32%}.hero-image-label{left:22px;right:22px;bottom:43px;padding-top:15px}.hero-image-label>span{font-size:14px}.hero-image-label small{display:block;font-size:6px}.hero-visual figcaption{left:22px;bottom:20px;font-size:8px}.hero-bottom{margin-top:22px;font-size:10px;padding:14px 0;gap:14px}.hero-bottom>span{max-width:185px;line-height:1.9}.hero-bottom>a{white-space:nowrap;min-height:44px}.learning-hub{grid-template-columns:1fr;margin-top:25px}.continue-card{padding:25px 25px 20px;border-right:0;border-bottom:1px solid var(--line)}.continue-card h2{font-size:24px;line-height:1.6;margin-top:13px}.continue-card h2>br{display:none}.continue-card .continue-link{margin-top:6px;font-size:13px;line-height:1.8;padding:9px 0;min-height:44px}.continue-card .micro-copy{max-width:none;font-size:10px;margin-top:5px}.continue-card .subtle-link{font-size:11px;margin-top:8px;min-height:36px}.find-card{padding:26px 25px 24px}.find-card h2{font-size:23px;margin-top:13px}.quick-search{margin-top:20px;padding-bottom:4px}.quick-search input{font-size:12px;min-height:48px}.keyword-links{gap:8px;margin-top:14px}.keyword-links a{min-height:36px;display:flex;align-items:center;font-size:10px;padding:6px 10px}.find-footnote{font-size:11px;margin-top:19px;line-height:1.9}.find-footnote a{display:inline-flex;min-height:30px;align-items:center}.home-section{margin-top:60px}.section-heading{display:block;margin-bottom:26px}.section-heading h2{font-size:27px;line-height:1.6}.section-heading .eyebrow{font-size:9px;margin-bottom:13px}.section-heading p:not(.eyebrow){font-size:12px;line-height:1.95;margin-top:12px}.section-heading .section-description{max-width:380px;margin-top:15px;font-size:12px}.section-heading .text-link{font-size:11px;margin-top:16px;min-height:36px}.study-steps{grid-template-columns:1fr}.study-steps>a,.study-steps>a:first-child,.study-steps>a:last-child{padding:24px 0 23px 48px;display:block}.study-steps>a+a{border-left:0;border-top:1px solid var(--line)}.step-number{position:absolute;left:0;top:27px;font-size:23px}.study-steps h3{font-size:17px;margin:0}.study-steps p{font-size:12px;max-width:none;line-height:1.95;margin-top:10px}.step-link{font-size:11px;min-height:36px;display:inline-flex;margin-top:13px}.unit-overview{grid-template-columns:1fr}.unit-card,.unit-card:nth-child(even){padding:25px 0 22px;border-left:0}.unit-card-main{grid-template-columns:34px 1fr 20px;gap:15px}.unit-no{font-size:25px}.unit-card h3{font-size:23px;line-height:1.55}.unit-range{font-size:9px;margin-top:1px;margin-bottom:8px}.unit-description{font-size:12px;line-height:1.95;max-width:none;margin-top:11px}.unit-arrow{font-size:20px}.unit-card .unit-progress{margin-left:49px;margin-top:19px}.unit-progress-label{font-size:9px}.unit-meter{height:3px}.extension-grid{gap:27px 16px}.image-wrap{aspect-ratio:3/4}.extension-item>.eyebrow{font-size:8px;margin-top:16px}.extension-item h3{font-size:18px;line-height:1.7;margin-top:7px}.extension-summary{font-size:10px;line-height:1.9;-webkit-line-clamp:4}.extension-image-arrow{right:10px;bottom:10px;width:28px;height:28px;font-size:15px}.closing-panel{grid-template-columns:1fr;margin-top:60px;padding:31px 27px;gap:30px}.closing-panel h2{font-size:31px;line-height:1.55;margin-top:17px}.closing-panel .eyebrow{font-size:8px}.closing-panel>div>p:not(.eyebrow){font-size:12px;line-height:1.95;margin-top:18px}.closing-panel .button{margin-top:24px;font-size:12px}.closing-quote{border-left:0;border-top:1px solid var(--line-dark);padding:32px 0 0}.quote-mark{font-size:57px;margin-bottom:7px}.closing-quote blockquote{font-size:20px;line-height:1.9}.closing-quote>p{margin-top:18px!important;font-size:10px!important}.site-footer{margin-top:64px}.footer-inner{margin:0 20px;padding:36px 0 30px;grid-template-columns:1fr;gap:30px}.footer-title{font-size:24px}.footer-inner p{font-size:11px}.footer-motto{margin-top:15px}.footer-note{border-top:1px solid var(--line);padding-top:23px}.footer-links{gap:2px 20px;margin-bottom:16px}.footer-links a{font-size:11px;min-height:40px}.footer-edition{font-size:10px!important;margin-top:15px}.page-intro{padding:42px 0 32px}.page-intro h1{font-size:33px;line-height:1.6;margin-top:15px}.page-intro>p:not(.eyebrow){font-size:13px;line-height:2;margin-top:17px}.page-intro .continue-link{font-size:12px;margin-top:13px;min-height:44px}.catalog-toolbar{grid-template-columns:1fr 1fr;gap:11px;padding-top:21px}.filter-search{grid-column:1/-1}.catalog-toolbar .input{font-size:12px;min-height:47px;width:100%}.catalog-summary{font-size:10px;padding:0}.catalog-toolbar select{padding-left:12px;padding-right:9px}.catalog-grid{margin-top:25px;gap:35px}.catalog-group-heading{gap:18px;padding-bottom:17px}.catalog-group-heading h2{font-size:24px;line-height:1.6}.catalog-group-heading .eyebrow{font-size:8px}.catalog-group-heading .subtle-link{font-size:10px;white-space:nowrap;min-height:44px}.course-row{grid-template-columns:52px 1fr 42px;gap:11px;min-height:80px;padding:16px 0}.course-row-arrow{display:none}.course-name{font-size:14px;line-height:1.8}.course-num{font-size:9px;line-height:1.8;white-space:normal}.course-duration{font-size:9px}.course-row.is-complete:before,.course-row.completed:before{left:-13px;font-size:10px}.unit-main>.breadcrumb{padding-top:28px;font-size:10px}.unit-hero{grid-template-columns:1fr;gap:0;margin:32px 0}.unit-index-art{display:none}.unit-hero h1{font-size:34px;line-height:1.6;max-width:350px;margin:18px 0}.unit-deck{font-size:14px;line-height:2}.unit-hero .reader-meta{font-size:10px;margin-top:16px}.unit-hero .button{font-size:12px;margin-top:25px}.unit-learning-line{grid-template-columns:1fr;gap:19px;padding:23px 0}.unit-learning-line .unit-progress-label{font-size:10px}.unit-learning-line p{font-size:11px;line-height:1.9}.unit-lessons{margin-top:39px}.unit-lessons .section-heading h2{font-size:25px}.unit-lessons .course-row{grid-template-columns:45px 1fr;gap:15px;padding:23px 0;min-height:0;align-items:start}.course-row-detailed .course-num{font-size:10px;margin-top:4px}.course-row-detailed .course-name{font-size:21px;line-height:1.7}.course-row-detailed .course-copy>p{font-size:12px;line-height:1.95;margin-top:10px}.course-row-detailed .course-duration{grid-column:2;justify-self:start;font-size:9px;margin-top:-5px}.unit-navigation{gap:20px;margin-top:37px;padding-top:22px}.unit-navigation>a+a{padding-left:20px}.unit-navigation strong{font-size:17px;line-height:1.8}.unit-navigation span{font-size:9px}.essay-layout{margin-top:35px;gap:28px}.essay-aside{padding-bottom:17px;font-size:10px}.essay-aside>a{min-height:44px;font-size:10px}.essay-body>h1{font-size:33px;line-height:1.6;margin:16px 0 18px}.essay-deck{font-size:16px;line-height:2;padding-bottom:26px;margin-bottom:26px}.prose{font-size:18px;line-height:2.1}.prose p{margin-top:1.2em}.prose .signature{font-size:21px}.about-grid{grid-template-columns:1fr;gap:30px;padding-top:30px}.about-grid>section{padding-left:36px}.about-number{font-size:18px}.about-grid h2{font-size:21px}.about-grid p{font-size:13px;line-height:2.05;margin-top:14px}.about-start{flex-wrap:wrap;gap:10px 25px}.error-page{padding:65px 0}.error-code{font-size:80px}.error-page h1{font-size:29px;line-height:1.6}.error-page>p:not(.error-code){font-size:13px;line-height:1.95}
/* Mobile reader */
body[data-lesson]:not([data-lesson='']) .site-header{--header-height:70px}.reading-progress{top:69px}.reader-shell,.focus-reading .reader-shell{padding:0 20px;max-width:100%;display:block}.mobile-reader-bar{margin-bottom:25px;gap:21px;min-height:49px;font-size:11px}.mobile-reader-bar>button{font-size:11px}.mobile-reader-bar svg{width:15px;height:15px}.reader-header .breadcrumb{font-size:9px;gap:8px;margin-bottom:22px;line-height:1.9}.reader-header .eyebrow{font-size:8px;letter-spacing:.1em}.reader-header h1,.focus-reading .reader-header h1{font-size:30px;line-height:1.65;margin-top:13px;margin-bottom:17px;letter-spacing:.015em}.reader-meta{font-size:9px}.reader-meta>span+span:before{margin:0 10px}.source-note{font-size:11px;line-height:1.9;padding:10px 12px;margin-top:20px}.reader-actions{margin-top:21px;gap:10px}.reader-tabs{gap:20px}.reader-tabs a{font-size:11px;min-height:48px}.reader-tabs a:last-child{display:none}.bookmark-button{font-size:11px;gap:6px;padding-left:7px}.bookmark-button svg{width:17px;height:17px}.reader-tools{top:70px;gap:15px;min-height:52px;padding:0;position:sticky}.reader-mode-buttons{gap:16px}.reader-mode-buttons button,.reading-settings summary{font-size:10px;gap:5px;min-height:48px}.reader-mode-buttons svg,.reading-settings summary svg{width:15px;height:15px}.tools-classroom{font-size:10px;gap:4px;min-height:48px}.tools-classroom svg{width:12px;height:12px}.reading-settings{margin-left:auto}.settings-panel{right:-75px;top:48px;min-width:260px;padding:20px}.settings-panel select{min-height:44px}.lesson-overview{padding:24px 22px;margin-top:24px}.lesson-overview .eyebrow{font-size:8px;line-height:1.9}.overview-deck{font-size:18px;line-height:2;margin-top:14px}.objectives{margin-top:19px;padding-top:18px}.objectives h2{font-size:11px}.objectives ol{gap:10px;margin-top:12px}.objectives li{font-size:12px;line-height:1.95;gap:10px}.objectives li>span{font-size:9px;line-height:2.6}.mobile-toc{margin-top:18px}.mobile-toc summary{min-height:50px;font-size:12px}.mobile-toc summary>span{font-size:9px}.mobile-toc nav{grid-template-columns:1fr;gap:0;padding-bottom:15px}.mobile-toc nav>a{font-size:12px;line-height:1.9;min-height:44px;display:flex;align-items:center;border-top:1px solid var(--line);padding:10px 0}.reading-start{padding-top:29px;padding-bottom:18px;font-size:8px;gap:14px;scroll-margin-top:132px}.lesson-body{font-size:calc(var(--reader-font-size) - 1px);line-height:var(--reader-line-height)}.chapter-section{padding-top:30px;scroll-margin-top:135px}.chapter-section h2{font-size:1.22em;line-height:1.8;margin-bottom:23px}.chapter-section h3{font-size:1.05em;line-height:1.8}.chapter-section p{text-align:justify;margin-bottom:1.15em}.lesson-body .figure{margin:24px auto 28px}.lesson-body .figure.portrait{max-width:300px;width:88%}.lesson-body .figure.diagram{width:100%}.lesson-body figcaption{font-size:10px;line-height:1.9;margin-top:10px}.lesson-body .references,.lesson-body .exercises{font-size:12px;padding-top:29px;margin-top:24px;line-height:2}.lesson-body .references h2,.lesson-body .exercises h2{font-size:22px}.lesson-body .classroom-inline{font-size:10px;margin:-11px 0 22px}.classroom-inline a{min-height:44px;line-height:1.9;gap:7px}.takeaways-section{margin-top:40px;padding-top:30px;scroll-margin-top:135px}.takeaways-section>.eyebrow{font-size:8px}.takeaways-section>h2{font-size:27px;margin-top:12px}.takeaways-section>ol{margin-top:20px}.takeaways-section>ol>li{gap:15px;padding:16px 0}.takeaways-section li>span{font-size:21px;min-width:25px}.takeaways-section li>p{font-size:17px;line-height:2}.practice-section{padding:25px 20px;margin-top:40px;scroll-margin-top:130px}.practice-heading{align-items:flex-start;gap:10px}.practice-heading h2{font-size:25px;line-height:1.7;margin-top:13px}.practice-heading .eyebrow{font-size:7px;letter-spacing:.08em;max-width:200px;line-height:1.9}.practice-time{font-size:9px;margin-top:0;padding:5px 7px}.practice-prompt{font-size:17px;line-height:2;margin-top:19px}.practice-steps{gap:15px;margin:21px 0 25px}.practice-steps>li{font-size:12px;line-height:2;gap:12px}.practice-steps>li>span{width:23px;height:23px;font-size:8px}.practice-writing{padding-top:23px}.practice-writing>label{font-size:13px}.practice-writing>p{font-size:11px;line-height:1.9}.practice-writing textarea{font-size:15px;line-height:1.95;padding:14px;min-height:205px}.practice-checklist{margin-top:20px}.practice-checklist legend{font-size:11px;margin-bottom:10px}.practice-checklist>label{min-height:44px;font-size:12px;gap:10px;line-height:1.9;padding:8px 0}.practice-checklist input{width:18px;height:18px;margin-top:2px}.note-actions{gap:10px}.note-actions .button,.note-actions .quiet-button{min-height:46px;font-size:12px;padding:11px 16px}.note-actions #note-status{font-size:10px;margin-top:4px}.practice-link{padding:16px 15px;margin-top:23px;gap:15px}.practice-link strong{font-size:12px;line-height:1.8}.practice-link span{font-size:10px;line-height:1.9;margin-top:6px}.practice-link svg{width:16px;height:16px}.related-section{margin-top:42px}.related-section .section-heading{margin-bottom:22px}.related-section .section-heading h2{font-size:25px;line-height:1.7}.related-grid{grid-template-columns:1fr;gap:13px}.related-card{padding:22px 22px 18px}.related-card h3{font-size:22px;line-height:1.65;margin-top:10px}.related-card>p{font-size:12px;line-height:1.95;margin-top:12px}.related-arrow{margin-top:12px}.lesson-end{margin-top:34px}.complete-line{align-items:flex-start;padding-top:25px;gap:20px}.complete-line .eyebrow{font-size:7px;letter-spacing:.1em}.complete-line p:not(.eyebrow){font-size:17px;line-height:1.9;max-width:180px;margin-top:8px}.complete-line .complete-button{font-size:11px;min-width:101px;min-height:46px;padding:11px 13px;margin-top:4px}.lesson-navigation{gap:18px;padding-top:22px;margin-top:27px}.lesson-navigation>a{padding-right:0}.lesson-navigation>a+a{padding-left:18px}.lesson-navigation span{font-size:9px;margin-bottom:11px;line-height:1.9}.lesson-navigation strong{font-size:17px;line-height:1.8}.back-top{right:15px;bottom:16px;min-width:44px;min-height:44px}.text-only .chapter-section{padding-top:25px}.text-only .chapter-section:first-child{padding-top:31px}.image-dialog{padding:9px 10px 15px;max-width:96vw;max-height:94dvh;min-width:94vw;border-radius:4px}.dialog-toolbar{padding:0 2px;margin-bottom:6px}.dialog-toolbar>span{font-size:10px}.dialog-image-wrap{display:block;position:relative;padding-bottom:57px}.dialog-image-wrap>img{max-height:calc(94dvh - 210px);max-width:100%;margin:auto}.image-prev,.image-next{position:absolute;bottom:0;min-width:44px;min-height:44px;font-size:20px}.image-prev{left:calc(50% - 51px)}.image-next{right:calc(50% - 51px)}#dialog-caption{font-size:10px;margin-top:12px;padding:0 7px;max-height:72px}.classroom-dialog{width:100vw;max-width:100vw;height:100dvh;max-height:100dvh;border:0;border-radius:0;margin:0}.classroom-dialog-header{padding:13px 18px}.classroom-dialog-header h2{font-size:19px;margin-top:4px}.classroom-dialog-header .eyebrow{font-size:7px}.classroom-dialog-footer{padding:9px 16px;gap:10px;font-size:9px;line-height:1.8;align-items:center}.classroom-dialog-footer>span{max-width:190px}.classroom-dialog-footer>a{font-size:10px;white-space:nowrap;min-height:44px}
/* Mobile search, index and study desk */
.search-form{gap:9px}.search-input-wrap>svg{left:14px;top:17px;width:18px;height:18px}.search-input-wrap>input{min-height:53px;padding-left:40px;padding-right:10px;font-size:13px}.search-form>.button{min-width:68px;padding:12px 17px;font-size:12px}.search-filters{gap:11px;margin-top:16px;display:grid;grid-template-columns:1fr 1fr}.search-filters>label{display:block;font-size:10px;line-height:1.8;min-width:0}.search-filters select{display:block;max-width:none;width:100%;margin-top:5px;font-size:11px;min-height:44px}.search-filters .quiet-button{grid-column:1/-1;font-size:11px;min-height:44px;margin:0 0 0 auto;padding:8px 13px}.search-main>.search-info{font-size:11px;line-height:1.9;margin-top:18px;padding-bottom:18px}.search-result{padding:23px 0}.result-meta{font-size:9px;gap:8px}.search-result h2{font-size:23px;line-height:1.65;margin:10px 0 12px}.search-result p,.result-excerpt{font-size:12px;line-height:2}.result-section{font-size:11px;min-height:44px;line-height:1.8;margin-top:8px}.search-suggestions{font-size:10px;gap:9px;margin-top:25px}.search-suggestions>span{flex-basis:100%;font-size:11px;margin-bottom:3px}.search-suggestions a{min-height:39px;padding:7px 12px}.search-empty,.empty-state{padding:30px 20px;font-size:12px}.glossary-search{margin-bottom:21px}.glossary-search>.input{min-height:49px;font-size:12px}.glossary-grid{grid-template-columns:1fr;gap:0}.glossary-entry{padding:28px 0 27px 36px}.concept-number{font-size:17px;top:32px}.glossary-entry h2{font-size:25px}.glossary-entry>p{font-size:13px;line-height:2.05;margin-top:15px}.concept-lessons{margin-top:21px;gap:4px}.concept-lessons>span{font-size:9px}.concept-lessons>a{font-size:11px;min-height:44px;line-height:1.95;padding:5px 0}.index-footnote{font-size:11px;padding-top:23px}.workspace-intro h1{font-size:32px;line-height:1.6}.workspace-intro>div>p:not(.eyebrow){font-size:13px;line-height:1.95;margin-top:15px}.workspace-intro>.button{margin-top:24px;font-size:12px;max-width:none;min-height:48px}.workspace-overview{grid-template-columns:1fr;gap:24px;padding:27px 25px}.workspace-progress-panel>.eyebrow{font-size:8px}.workspace-progress-label{font-size:11px;margin-top:13px}.workspace-progress-label strong{font-size:43px}.workspace-local-note{border-left:0;border-top:1px solid var(--line-dark);padding:22px 0 0;gap:11px}.workspace-local-note h2{font-size:13px}.workspace-local-note p{font-size:11px;line-height:1.95;margin-top:9px}.workspace-jump{gap:0;justify-content:space-between;overflow:auto;margin-top:17px}.workspace-jump a{min-height:52px;white-space:nowrap;font-size:10px;padding:0 6px}.workspace-jump a:first-child{padding-left:0}.workspace-jump a:last-child{padding-right:0}.workspace-grid{grid-template-columns:1fr;gap:0}.workspace-section{margin-top:35px}.workspace-section .section-heading{margin-bottom:22px;display:flex;gap:20px}.workspace-section .section-heading .eyebrow{font-size:8px;line-height:1.9}.workspace-section .section-heading h2{font-size:27px}.workspace-section .section-heading p:not(.eyebrow){font-size:11px}.workspace-empty{padding:26px 24px}.workspace-empty h3{font-size:21px;line-height:1.8}.workspace-empty p{font-size:12px;line-height:1.95;margin-top:12px}.workspace-empty a{font-size:12px;min-height:44px;margin-top:13px}.empty-symbol{font-size:27px;margin-bottom:17px}.workspace-item{padding:19px 0;gap:12px}.workspace-item h3,.workspace-item strong{font-size:19px}.workspace-item p,.workspace-item small,.workspace-item span{font-size:10px}.workspace-item .quiet-button{font-size:10px;min-height:44px;padding:8px 11px}.notes-section{margin-top:38px}.workspace-note{padding:23px 22px;margin-top:14px}.workspace-note h3{font-size:21px}.workspace-note header,.workspace-note-heading{display:block}.workspace-note p,.workspace-note time,.workspace-note small{font-size:10px}.workspace-note pre,.workspace-note-text{font-size:13px;line-height:2;padding:16px 0;margin-top:16px}.workspace-note .quiet-button{font-size:11px;min-height:44px}.backup-section{padding:28px 24px;margin-top:40px;gap:25px}.backup-section h2{font-size:27px;line-height:1.7;margin-top:13px}.backup-section>.eyebrow,.backup-section>div>.eyebrow{font-size:8px}.backup-section>div>p:not(.eyebrow){font-size:12px;line-height:2;margin-top:16px}.backup-controls{gap:10px}.backup-controls>.button,.backup-controls>.quiet-button{font-size:11px;min-height:46px;padding:11px 15px}.backup-controls #workspace-status{font-size:11px;line-height:1.9}.import-preview{padding:16px;font-size:11px}.data-reset{font-size:11px;padding-top:10px}.data-reset summary{min-height:44px}.data-reset p{font-size:11px}.danger-button{font-size:11px;min-height:44px}.no-script{font-size:12px;padding:15px 17px}}
@media(max-width:370px){.header-inner{padding:0 16px}.brand-text{font-size:17px}.brand-mark{width:20px}.brand small{font-size:5px}.header-actions .search-link{width:32px}.header-actions .icon-button{min-width:39px;width:39px}.site-main{width:calc(100% - 32px)}.hero h1{font-size:40px}.hero-subtitle{font-size:15px}.hero-actions{gap:17px}.hero-actions .button{font-size:11px;padding:11px 15px}.hero-actions .text-link{font-size:11px}.hero-image-label small{display:none}.continue-card,.find-card{padding-left:22px;padding-right:22px}.section-heading h2{font-size:25px}.unit-card h3{font-size:21px}.unit-card-main{gap:12px}.extension-item h3{font-size:16px}.closing-panel{padding:28px 23px}.closing-panel h2{font-size:28px}.reader-shell,.focus-reading .reader-shell{padding:0 16px}.reader-header h1,.focus-reading .reader-header h1{font-size:28px}.reader-mode-buttons{gap:12px}.reader-tools{gap:12px}.reader-mode-buttons button,.reading-settings summary,.tools-classroom{font-size:9px}.reader-mode-buttons svg,.reading-settings summary svg{width:14px}.reader-tabs{gap:18px}.lesson-overview{padding:22px 20px}.overview-deck{font-size:17px}.practice-section{padding:23px 17px}.practice-heading h2{font-size:23px}.practice-time{font-size:8px;padding:5px}.lesson-body{font-size:calc(var(--reader-font-size) - 2px)}.glossary-entry h2{font-size:24px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}
/* A legible, self-contained print edition. */
@media print{@page{size:A4;margin:19mm 17mm}html{scroll-behavior:auto}body{background:#fff!important;color:#000!important;font-size:11pt}body *{box-shadow:none!important;text-shadow:none!important}.site-header,.site-footer,.course-sidebar,.toc-sidebar,.mobile-reader-bar,.reader-tools,.reader-actions,.mobile-toc,.reading-progress,.lesson-navigation,.unit-navigation,.complete-line,.related-section,.classroom-inline,.practice-link,.back-top,.drawer-scrim,.course-drawer,dialog,.toast,.note-actions,.workspace-jump,.backup-section{display:none!important}.reader-shell,.focus-reading .reader-shell{display:block;max-width:none;width:100%;padding:0}.reader-main{padding:0}.reader-header h1,.focus-reading .reader-header h1{font-size:26pt;line-height:1.45;margin:10pt 0 15pt}.reader-header .breadcrumb{display:none}.reader-meta{font-size:8pt}.source-note{font-size:8pt;background:#fff;border-left:1px solid #777}.lesson-overview{margin:20pt 0;padding:15pt;border:1px solid #bbb;background:#fff;break-inside:avoid}.overview-deck{font-size:12pt;line-height:1.8}.objectives li{font-size:9pt}.objectives h2{font-size:9pt}.eyebrow{font-size:7pt;color:#444}.lesson-body{font-size:11pt;line-height:1.85}.chapter-section{padding-top:20pt}.chapter-section h2{font-size:16pt;margin-bottom:13pt;break-after:avoid}.chapter-section p{orphans:3;widows:3}.lesson-body .figure{break-inside:avoid;margin:15pt auto;max-width:100%}.lesson-body .figure.portrait{max-width:50%}.lesson-body .figure.diagram img{max-height:160mm;width:auto;max-width:100%}.lesson-body figcaption{font-size:7pt;color:#444}.text-only .lesson-body figure{display:none}.lesson-body .references,.lesson-body .exercises{font-size:8pt;color:#333}.reading-start{font-size:7pt;padding:16pt 0 10pt}.reading-start>.js-only{display:none}.takeaways-section{margin-top:24pt;padding-top:18pt}.takeaways-section h2{font-size:18pt}.takeaways-section li>p{font-size:11pt}.takeaways-section>ol>li{padding:10pt 0;break-inside:avoid}.practice-section{background:#fff;border:1px solid #bbb;padding:18pt;margin-top:24pt;break-before:page}.practice-heading h2{font-size:18pt}.practice-prompt{font-size:11pt}.practice-steps>li{font-size:9pt}.practice-writing>label{font-size:10pt}.practice-writing>p{font-size:8pt}.practice-writing textarea{font-size:10pt;color:#000;background:#fff;min-height:45mm;border:1px solid #aaa}.practice-checklist>label{font-size:9pt}.site-main{max-width:none;width:100%;margin:0}.page-intro{padding:0 0 20pt}.prose{font-size:11pt;line-height:1.9}.essay-layout{display:block;margin:0}.essay-aside{display:none}.essay-body h1{font-size:24pt}.hero-visual{max-height:100mm}.home-section{margin-top:30pt}.hero{min-height:0}.search-form,.search-filters,.search-suggestions,.catalog-toolbar,.glossary-search{display:none}.catalog-grid,.glossary-grid{display:block}.catalog-group,.glossary-entry{break-inside:avoid}.glossary-entry{padding-top:15pt;padding-bottom:15pt}.course-row{min-height:0;padding:10pt 0}.workspace-grid,.workspace-overview{display:block}.workspace-section{margin-top:20pt}.workspace-note{break-inside:avoid}a{color:#000!important}h2,h3{break-after:avoid}}
/* Persisted-state details are generated by the small local reader script. */
.storage-status{font-size:10px;line-height:1.9;color:var(--muted);margin-top:10px}.storage-status:empty{display:none}.storage-status[data-error=true],[data-error=true]{color:#92523b}html[data-theme=dark] .storage-status[data-error=true],html[data-theme=dark] [data-error=true]{color:#edb79e}#workspace-progress>p.workspace-empty{border:0;padding:0;background:transparent;font-size:10px;line-height:1.95;margin-top:12px}progress.workspace-meter{appearance:none;display:block;width:100%;border:0;height:4px;border-radius:0;color:var(--accent);background:var(--line-dark)}progress.workspace-meter::-webkit-progress-bar{background:var(--line-dark)}progress.workspace-meter::-webkit-progress-value{background:var(--accent)}progress.workspace-meter::-moz-progress-bar{background:var(--accent)}.workspace-item>a{font-family:var(--serif);font-size:18px;line-height:1.8}.workspace-item>a:hover{color:var(--accent)}details.workspace-note>summary{font-family:var(--serif);font-size:21px;line-height:1.7;min-height:44px;cursor:pointer;list-style:none;display:flex;align-items:center;gap:15px}details.workspace-note>summary::-webkit-details-marker{display:none}details.workspace-note>summary:after{content:'+';margin-left:auto;color:var(--muted);font-family:var(--sans);font-size:20px;flex:none}details.workspace-note[open]>summary:after{content:'−'}.workspace-note-actions>a,.workspace-note-actions>button{font-family:var(--sans);font-size:11px;min-height:44px;display:inline-flex;align-items:center;padding:8px 13px;border:1px solid var(--line);border-radius:3px;color:var(--accent);line-height:1.8}.workspace-note-actions>a:hover,.workspace-note-actions>button:hover{background:var(--soft)}.workspace-note-actions>button:last-child{color:var(--muted)}
@media(max-width:640px){.header-actions .icon-button,.header-actions .search-link{min-width:44px;width:44px;min-height:44px}.storage-status{font-size:10px}.workspace-item>a{font-size:19px;line-height:1.8}details.workspace-note>summary{font-size:21px}.workspace-note-actions{gap:8px}.workspace-note-actions>a,.workspace-note-actions>button{font-size:10px;padding:8px 11px}}
.home-progress-summary{display:flex;align-items:baseline;gap:4px;font-size:10px;color:var(--muted);margin:2px 0 9px}.home-progress-summary strong{font-size:15px;font-weight:500;color:var(--accent)}.home-progress-summary>span{margin-left:14px;font-size:9px}.reader-mode-buttons>button{min-width:44px}.no-js .lesson-body .figure img{cursor:default}

.brand{min-height:44px}@media(max-width:640px){.keyword-links a,.search-suggestions a,.footer-links a{min-height:44px}}

/* 备案信息 */
.footer-icp{opacity:.9;color:#4f584f;font-size:12px;margin-top:.5rem}
.footer-icp a{text-decoration:underline;text-underline-offset:2px}

/* 常见问题 */
.faq-section{max-width:52rem}
.faq-section h2{margin:0 0 1.5rem}
.faq-section .faq-item{border-top:1px solid rgba(0,0,0,.12);padding:1.1rem 0}
.faq-section h3{font-size:1.02rem;margin:0 0 .45rem;font-weight:600}
.faq-section p{margin:0;line-height:1.85;opacity:.85}

/* 章节相邻导航 */
.lesson-adjacent{display:flex;justify-content:space-between;gap:1rem;max-width:48rem;margin:3rem auto 0;padding:1.25rem 1.5rem 0;border-top:1px solid rgba(0,0,0,.12);font-size:.95rem}
.lesson-adjacent a{text-decoration:none}
.lesson-adjacent .spacer{flex:1}

/* release globals */
/* Reader-facing presentation; source and maintenance material stay outside the public build. */
:root:not([data-theme=dark]){--paper:#f7f5ef;--surface:#fffefa;--soft:#efefe6;--ink:#203c34;--muted:#5b6b60;--faint:#5a645a;--accent:#32614e;--accent-deep:#214b39;--line:#dce1d4;--sage:#e2e9dc;--shadow:0 20px 55px #253c3010}.site-header{background:var(--paper);border-bottom:1px solid var(--line)}.header-inner{max-width:1360px}.brand small{letter-spacing:.12em;font-size:10px}.header-nav{gap:27px}.header-nav a{font-size:14px}.site-footer{margin-top:60px;background:var(--soft);border-top:1px solid var(--line)}.footer-inner{display:grid;grid-template-columns:1fr 1fr 1fr;gap:35px;padding-top:44px;padding-bottom:44px}.footer-inner nav{display:flex;flex-wrap:wrap;gap:13px 22px;align-content:start}.footer-inner p{font-size:12px;line-height:1.9}.footer-inner .footer-title{font-size:24px;margin-bottom:10px}.footer-note{color:var(--muted)}.hero-actions{flex-wrap:wrap;gap:20px}.button{border-radius:4px;min-height:48px;font-size:14px}.button.secondary{background:transparent;border:1px solid var(--line-dark);color:var(--accent-deep)}.v7-tool-actions{display:flex;flex-wrap:wrap;gap:14px}.v7-tool-actions button{min-height:44px}.v7-field{margin:22px 0}.v7-field label{display:block;font-size:17px;font-weight:500;margin-bottom:11px}.v7-blank-links{display:flex;flex-wrap:wrap;gap:20px;font-size:12px;margin-top:20px}.v7-save-status{font-size:12px;color:var(--muted)}.reader-header .release-share{font-family:var(--sans);font-size:12px;margin:18px 0}.reader-actions{flex-wrap:wrap}.reader-actions>.release-share{flex:1 0 100%;order:2;margin:12px 0 0;gap:10px}