@import url('fonts.css');
:root{--paper:#f5f4ec;--ink:#23352d;--muted:#69756b;--accent:#315947;--line:#d9dfd4;--warm:#bd724f;--white:#fffef8;--serif:'Noto Serif','Times New Roman',serif;--sans:'Be Vietnam Pro','Segoe UI',sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:105px}body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.7}button,input,a{-webkit-tap-highlight-color:transparent}button,input{font:inherit}button,a{touch-action:manipulation}a{color:inherit;text-decoration:none}button{cursor:pointer}button:disabled{cursor:default}button:focus-visible,a:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid var(--warm);outline-offset:5px}h1,h2,h3,p{margin-top:0}h1,h2,h3{font-weight:400}h1,h2{font-family:var(--serif);letter-spacing:-.025em;line-height:1.07}h1 em,h2 em{font-weight:400;color:var(--accent)}h3{line-height:1.4}.container{width:min(1180px,calc(100% - 96px));margin-inline:auto}.eyebrow{font-size:14px;letter-spacing:.15em;font-weight:600;text-transform:uppercase;color:var(--muted)}.skip-link{position:fixed;left:12px;top:-70px;background:var(--accent);color:white;padding:12px 20px;z-index:99}.skip-link:focus{top:12px}
#site-header{position:sticky;top:0;z-index:20;background:rgba(245,244,236,.96);border-bottom:1px solid var(--line);backdrop-filter:blur(16px)}.header-inner{height:87px;display:flex;align-items:center;gap:32px}.brand{display:flex;align-items:center;gap:12px;font-size:16px;font-weight:600}.brand-symbol{width:37px;height:37px;border:1px solid var(--accent);border-radius:50%;font:italic 29px var(--serif);display:grid;place-items:center;padding-right:3px}.brand small{display:block;font-size:12px;font-weight:500;letter-spacing:.16em;color:var(--muted)}.main-nav{display:flex;gap:30px;align-items:center;margin-left:auto;font-size:16px}.main-nav a{padding:8px 0;position:relative;color:var(--muted)}.main-nav a.active{color:var(--ink)}.main-nav a.active:after{content:'';position:absolute;bottom:1px;left:0;right:0;height:2px;background:var(--accent)}.header-present{border:1px solid var(--line);border-radius:6px;background:transparent;padding:9px 15px;font-size:14px;color:var(--ink)}.header-present:hover{background:var(--accent);color:var(--paper);border-color:var(--accent)}.menu-toggle{display:none;background:transparent;border:1px solid var(--line);padding:5px 10px;color:var(--ink);border-radius:4px}.button{display:inline-flex;align-items:center;justify-content:center;gap:26px;min-height:48px;padding:12px 22px;border-radius:5px;border:1px solid transparent;font-size:16px;font-weight:500;transition:background .25s,transform .25s}.button:hover{transform:translateY(-2px)}.button.primary{background:var(--accent);color:var(--white)}.button.primary:hover{background:#244a39}.button span{font-size:20px;font-weight:400;line-height:1}.text-button{background:none;border:0;padding:12px 0;color:var(--ink);display:flex;align-items:center;gap:9px;font-size:16px}.play-icon{font-size:23px;line-height:1}.inline-link{font-size:16px;font-weight:500;color:var(--accent);display:inline-flex;gap:16px;align-items:center;border-bottom:1px solid var(--accent);padding-bottom:3px}.inline-link:hover{color:var(--warm);border-color:var(--warm)}
.hero{display:grid;grid-template-columns:1.1fr 1fr;gap:90px;align-items:center;min-height:680px;padding-top:54px;padding-bottom:54px}.hero .eyebrow{display:flex;align-items:center;gap:12px;margin-bottom:24px}.small-line{width:24px;height:1px;background:var(--warm)}.hero h1{font-size:clamp(70px,6.7vw,98px);margin-bottom:25px}.hero-intro{font-size:17px;line-height:1.8;margin-bottom:16px}.hero-description{color:var(--muted);max-width:370px;font-size:16px;line-height:1.9}.hero-actions{display:flex;align-items:center;gap:26px;margin-top:29px}.hero-note{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--muted);margin-top:37px}.dot{width:5px;height:5px;background:var(--warm);border-radius:50%}.note-divider{opacity:.35;padding-inline:4px}.hero-visual{position:relative;padding:15px 0 36px 22px}.visual-orbit{position:absolute;right:-17px;top:12px;width:375px;height:375px;border:1px solid #ced6c8;border-radius:50%;z-index:-1}.visual-orbit:after{content:'';position:absolute;top:30px;right:35px;width:9px;height:9px;background:var(--warm);border:3px solid var(--paper);border-radius:50%}.day-paper{position:relative;z-index:1;background:var(--white);box-shadow:0 17px 50px #23352d0c;border:1px solid #e0e4d8;border-radius:3px;padding:26px 31px 25px;transform:rotate(-2deg)}.paper-top{display:flex;align-items:center;justify-content:space-between;font-size:12px;letter-spacing:.12em;color:var(--muted);margin-bottom:24px}.paper-number{color:#9da89a}.day-paper h2{font-size:44px;margin-bottom:15px;letter-spacing:-.045em}.day-paper>p{font-size:14px;color:var(--muted);margin-bottom:20px}.day-paper>p strong{color:var(--ink);font-weight:500}.day-bar{display:flex;height:96px;overflow:hidden;border-radius:3px;gap:3px}.day-bar>div{display:flex;flex-direction:column;justify-content:center;padding-left:15px;transition:width .3s;min-width:35px}.day-bar strong{font-family:var(--serif);font-size:29px;font-weight:400;line-height:1.4}.day-bar span{font-size:12px}.necessary{width:50%;background:#d9e2d4;color:var(--accent)}.surplus{width:50%;background:var(--warm);color:var(--white)}.day-values{display:flex;justify-content:space-between;margin:14px 0 24px;gap:15px}.day-values>div{display:flex;flex-direction:column;flex:1}.day-values span{font-size:12px;color:var(--muted)}.day-values strong{font-size:14px;font-weight:500;margin-top:3px}.day-values>div:last-child strong{color:#a45c3a}.day-range{border-top:1px dashed var(--line);padding-top:17px}.day-range label{display:flex;justify-content:space-between;font-size:12px;align-items:center}.day-range label span{font-weight:600;font-size:14px;color:var(--accent)}input[type=range]{width:100%;accent-color:var(--accent);cursor:pointer;margin:12px 0 0;height:17px}.range-ends{display:flex;justify-content:space-between;font-size:12px;color:var(--muted)}.day-paper .paper-footnote{font-size:12px;line-height:1.7;margin:16px 0 0;color:#7f8a7d}.formula-stamp{position:absolute;z-index:2;right:-30px;bottom:15px;background:#e4e8da;padding:15px 23px;border:1px solid #d5ddcc;transform:rotate(4deg);box-shadow:0 8px 22px #23352d08}.formula-stamp span{display:block;font-size:12px;letter-spacing:.1em;margin-bottom:5px;color:var(--muted)}.formula-stamp strong{font:400 26px var(--serif);letter-spacing:-.02em}.formula-stamp em{color:var(--warm)}.visual-caption{position:absolute;bottom:-8px;left:25px;font-size:12px;letter-spacing:.12em;color:var(--muted)}
.question-strip{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:#ebeede}.question-strip .container{display:flex;align-items:center;gap:55px;padding-block:30px}.question-strip .eyebrow{width:158px;flex-shrink:0;margin:0}.question-strip p{font-family:var(--serif);font-size:26px;line-height:1.4;letter-spacing:-.03em;margin:0}.round-link{margin-left:auto;display:grid;place-items:center;border:1px solid #bec8b6;border-radius:50%;width:47px;height:47px;font-size:23px;flex-shrink:0;transition:background .25s}.round-link:hover{background:var(--accent);color:white}.lesson-section{padding-block:100px 55px}.section-heading{display:flex;justify-content:space-between;align-items:flex-end;gap:30px;margin-bottom:35px}.section-heading .eyebrow{margin-bottom:17px}.section-heading h2{font-size:52px;margin:0}.section-heading>p{font-size:14px;color:var(--muted);margin-bottom:5px;line-height:1.9}.lesson-list{border-top:1px solid var(--line)}.lesson-item{border-bottom:1px solid var(--line)}.lesson-toggle{padding:24px 0;display:grid;grid-template-columns:58px 1fr 36px;align-items:center;gap:18px;width:100%;border:none;background:transparent;text-align:left;color:var(--ink)}.lesson-number{font-size:14px;color:var(--warm);align-self:start;padding-top:5px}.lesson-toggle h3{margin:0 0 5px;font-size:19px;font-weight:500;letter-spacing:-.04em}.lesson-toggle p{font-size:14px;color:var(--muted);margin:0}.lesson-plus{display:grid;place-items:center;font-size:26px;border:1px solid var(--line);border-radius:50%;width:33px;height:33px;font-weight:400;transition:transform .3s,background .3s}.lesson-toggle[aria-expanded=true] .lesson-plus{transform:rotate(45deg);background:var(--accent);color:var(--white);border-color:var(--accent)}.lesson-toggle:hover h3{color:var(--accent)}.lesson-panel{display:grid;grid-template-rows:0fr;opacity:0;transition:grid-template-rows .45s ease,opacity .3s ease}.lesson-panel.open{grid-template-rows:1fr;opacity:1}.panel-overflow{overflow:hidden}.panel-content{padding:5px 48px 33px 76px}.point-list{list-style:none;margin:0;padding:0;display:grid;gap:15px}.point-list li{position:relative;padding-left:18px;font-size:16px;line-height:1.85}.point-list li:before{content:'';position:absolute;left:0;top:10px;width:4px;height:4px;background:var(--warm);border-radius:50%}.point-list strong{display:block;font-size:16px;font-weight:600;margin-bottom:2px}.point-list p{margin:0;color:var(--muted)}.formula-box{background:#e8ecdf;border-left:2px solid var(--accent);padding:20px 24px;margin:24px 0}.formula-box .expression{display:block;font-family:var(--serif);font-size:28px;color:var(--accent);line-height:1.5;letter-spacing:-.02em}.formula-box .caption{display:block;font-size:14px;color:var(--muted);margin-top:6px}.example-box{background:var(--white);border:1px solid var(--line);padding:20px 24px;margin:20px 0;font-size:16px}.example-box strong{display:block;margin-bottom:8px;font-size:14px;letter-spacing:.04em;text-transform:uppercase;font-weight:600;color:var(--warm)}.example-box p{margin:0;color:var(--muted)}.takeaway-text{font-size:16px;color:var(--accent);font-weight:500;border-left:2px solid var(--warm);padding-left:16px;margin-top:20px}.panel-content>.inline-link{margin-top:12px}.lesson-end{display:flex;justify-content:space-between;margin-top:25px;font-size:14px;color:var(--muted)}
.resources-section{padding-block:60px 100px}.resource-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border:1px solid var(--line);border-radius:5px;overflow:hidden}.resource-link{padding:32px 30px;position:relative;min-height:300px;border-right:1px solid var(--line);background:#eeefe5;transition:background .3s}.resource-link:last-child{border-right:0}.resource-link:hover{background:#e4e9dc}.resource-icon{display:block;font-family:var(--serif);font-size:37px;line-height:1.2;color:var(--accent);margin-bottom:35px}.resource-label{display:block;font-size:12px;letter-spacing:.1em;color:var(--muted);margin-bottom:12px}.resource-link h3{font-family:var(--serif);font-size:29px;letter-spacing:-.03em;margin-bottom:12px}.resource-link p{font-size:14px;color:var(--muted);margin:0;line-height:1.9}.resource-arrow{position:absolute;right:26px;top:34px;font-size:23px;color:var(--accent)}.resource-link.upcoming{background:transparent}.upcoming .resource-icon{color:#8b9484}.soon{display:inline-block;font-size:12px;background:#e4e7dc;padding:3px 9px;border-radius:12px;color:var(--muted);margin-top:14px}.takeaway-section{background:#e4e9db;text-align:center;padding:70px 0}.takeaway-section h2{font-size:59px;margin-bottom:25px}.takeaway-section p:not(.eyebrow){font-size:16px;color:var(--muted);max-width:600px;margin:0 auto 30px;line-height:1.9}.takeaway-section .eyebrow{margin-bottom:20px}
#site-footer{padding:41px 0 25px;background:var(--paper)}.footer-top{display:flex;gap:60px;align-items:flex-start;padding-bottom:25px}.footer-brand{min-width:185px}.footer-brand h3{font:26px var(--serif);letter-spacing:-.03em;margin-bottom:9px}.footer-brand p{font-size:12px;color:var(--muted);line-height:1.8;margin:0}.credits-grid{flex:1;display:grid;grid-template-columns:repeat(3,1fr);column-gap:30px;row-gap:17px}.credit-role{font-size:12px;color:var(--muted);display:block;margin-bottom:3px}.credit-names{font-size:12px;color:var(--ink);line-height:1.7}.footer-bottom{display:flex;justify-content:space-between;border-top:1px solid var(--line);padding-top:16px;font-size:12px;color:var(--muted)}.footer-bottom a{color:var(--accent)}
.reveal{opacity:0;transform:translateY(16px);transition:opacity .65s ease var(--delay,0ms),transform .65s ease var(--delay,0ms)}.reveal.visible{opacity:1;transform:translateY(0)}.lecture-main{padding-top:65px}.lecture-heading{margin-bottom:80px}.lecture-heading h1{font-size:72px;margin-bottom:20px}.lecture-heading>p:not(.eyebrow){font-size:16px;color:var(--muted);margin-bottom:27px}.lecture-layout{display:grid;grid-template-columns:220px minmax(0,1fr);gap:68px}.lecture-sidebar{position:sticky;top:127px;align-self:start}.lecture-sidebar>span{display:block;margin-bottom:22px}.lecture-sidebar nav{display:flex;flex-direction:column;gap:2px;margin-bottom:25px}.chapter-link{display:flex;gap:13px;padding:9px 10px 9px 0;font-size:14px;color:var(--muted);border-left:2px solid transparent;line-height:1.7}.chapter-link span{font-size:12px;color:var(--warm)}.chapter-link.active{padding-left:12px;border-color:var(--accent);color:var(--accent);background:#e9ece1}.chapter{padding-bottom:55px;margin-bottom:48px;border-bottom:1px solid var(--line);scroll-margin-top:120px}.chapter h2{font-size:43px;margin-bottom:22px}.chapter-lead{font-size:16px;line-height:1.9;margin-bottom:24px;color:var(--muted)}.chapter .point-list{gap:22px}.chapter .point-list li,.chapter .point-list strong{font-size:16px}.table-wrap{overflow:auto;margin-top:27px;border:1px solid var(--line);border-radius:4px}table{border-collapse:collapse;width:100%;text-align:left;font-size:14px;min-width:580px}th{background:#e7ebdf;color:var(--accent);font-weight:600}th,td{padding:14px;border-bottom:1px solid var(--line);line-height:1.8;vertical-align:top}tr:last-child td{border-bottom:0}tr:nth-child(even) td{background:#eeefe5}.model-table td:not(:first-child),.model-table th:not(:first-child){text-align:center;white-space:nowrap}.model-table tfoot td{background:#dee6d6;font-weight:600}.table-note{font-size:12px;color:var(--muted);margin-top:11px}.sources{margin-top:28px;padding-top:18px;border-top:1px solid var(--line)}.sources summary{cursor:pointer;font-size:14px;color:var(--accent)}.sources ul{padding-left:17px;margin:12px 0 0}.sources li{font-size:14px;margin:7px 0;color:var(--muted)}.sources a{text-decoration:underline;text-underline-offset:3px}.lecture-conclusion{margin:0 0 80px 288px;padding:35px;background:#e4e9db}.lecture-conclusion h2{font-size:42px;margin-bottom:20px}.lecture-conclusion>p:not(.eyebrow){font-size:16px;line-height:1.9;color:var(--muted);margin-bottom:25px}
.presentation-dialog{border:0;padding:0;width:100vw;max-width:none;height:100dvh;max-height:none;background:var(--paper);color:var(--ink);margin:0;overflow:hidden}.presentation-dialog::backdrop{background:#23352dc9}.presentation-dialog[open]{display:flex;flex-direction:column;animation:dialog-in .3s ease}.presentation-top{display:flex;justify-content:space-between;align-items:center;padding:22px 40px;border-bottom:1px solid var(--line);gap:20px}.presentation-top span{font-size:14px;letter-spacing:.12em;color:var(--muted)}.presentation-tools{display:flex;gap:12px}.presentation-tools button{background:none;border:1px solid var(--line);border-radius:4px;color:var(--ink);font-size:14px;padding:6px 12px}.slide-stage{flex:1;overflow:auto;display:flex;align-items:center;width:100%;padding:30px 7vw}.slide-inner{width:min(1060px,100%);margin:auto}.slide-inner .eyebrow{color:var(--warm);margin-bottom:22px}.slide-inner h2{font-size:clamp(35px,4.3vw,68px);max-width:1020px;margin-bottom:24px;line-height:1.17}.slide-lead{font-size:clamp(14px,1.4vw,21px);color:var(--muted);max-width:940px;line-height:1.8;margin-bottom:25px}.slide-points{list-style:none;padding:0;margin:0;display:grid;gap:14px}.slide-points li{font-size:clamp(14px,1.3vw,19px);position:relative;padding-left:25px;line-height:1.8}.slide-points li:before{content:'';width:5px;height:5px;border-radius:50%;background:var(--warm);position:absolute;left:0;top:.75em}.slide-formula{font:clamp(25px,3vw,45px) var(--serif);color:var(--accent);padding:20px 25px;border-left:3px solid var(--accent);background:#e5eadd;margin:25px 0 0;line-height:1.5}.slide-footnote{font-size:14px;color:var(--muted);margin:20px 0 0}.presentation-bottom{padding:16px 40px 22px;border-top:1px solid var(--line);display:flex;align-items:center;gap:20px}.slide-count{font-size:16px;font-weight:500;min-width:60px}.slide-progress{display:flex;gap:6px;align-items:center;flex:1}.slide-progress button{width:22px;height:4px;padding:0;background:#cfd8c6;border:0;border-radius:2px;transition:background .25s}.slide-progress button[aria-current=true]{background:var(--accent)}.slide-nav{display:flex;gap:9px}.slide-nav button{border:1px solid var(--line);color:var(--ink);background:transparent;border-radius:4px;padding:7px 15px;font-size:16px}.slide-nav button:disabled{opacity:.3}.slide-nav button:not(:disabled):hover{background:var(--accent);color:white}.slide-key-hint{font-size:12px;color:var(--muted);white-space:nowrap}.slide-enter{animation:slide-in .3s ease}@keyframes slide-in{from{opacity:0;transform:translateY(9px)}to{opacity:1;transform:translateY(0)}}@keyframes dialog-in{from{opacity:0}to{opacity:1}}
@media(min-width:1550px){.hero{min-height:740px}}@media(max-width:1100px){.container{width:calc(100% - 64px)}.hero{gap:45px}.hero h1{font-size:76px}.hero-visual{padding-left:0}.formula-stamp{right:-12px}.main-nav{gap:22px}.lecture-layout{gap:40px;grid-template-columns:190px minmax(0,1fr)}.lecture-conclusion{margin-left:230px}.hero-note{font-size:12px}.resource-link{padding:27px 23px}.visual-orbit{width:325px;height:325px}}
@media(max-width:800px){.container{width:calc(100% - 40px)}.header-inner{height:73px;gap:15px}.brand{font-size:16px;gap:9px}.brand small{font-size:12px}.brand-symbol{width:32px;height:32px;font-size:25px}.header-present{margin-left:auto;font-size:14px;padding:8px 10px}.menu-toggle{display:block}.main-nav{display:none;position:absolute;top:73px;left:0;right:0;background:var(--paper);padding:15px 22px;border-bottom:1px solid var(--line);gap:22px;flex-wrap:wrap}.main-nav.menu-open{display:flex}.hero{grid-template-columns:1fr;gap:45px;padding-top:45px;padding-bottom:50px;min-height:auto}.hero-copy{max-width:600px}.hero h1{font-size:76px}.hero-description{max-width:480px}.hero-visual{width:min(440px,calc(100% - 25px));margin:0 auto;padding-top:0;padding-bottom:40px}.hero-note{font-size:12px;margin-top:28px;flex-wrap:wrap}.visual-orbit{width:340px;height:340px;right:-12px}.hero-visual .day-paper{transform:rotate(-1deg)}.question-strip .container{gap:22px;padding-block:25px}.question-strip .eyebrow{width:106px;font-size:12px}.question-strip p{font-size:22px}.round-link{width:38px;height:38px;font-size:20px}.lesson-section{padding-top:65px}.section-heading{align-items:flex-start;flex-direction:column;gap:16px}.section-heading h2{font-size:43px}.section-heading>p br{display:none}.lesson-toggle{grid-template-columns:30px 1fr 30px;gap:13px}.lesson-toggle h3{font-size:17px}.lesson-toggle p{font-size:14px}.lesson-plus{width:28px;height:28px;font-size:22px}.panel-content{padding-left:43px;padding-right:0}.resource-grid{grid-template-columns:1fr}.resource-link{min-height:205px;border-right:0;border-bottom:1px solid var(--line);padding:25px}.resource-link:last-child{border-bottom:0}.resource-icon{margin-bottom:16px;font-size:28px}.resource-label{margin-bottom:7px}.resource-link h3{font-size:26px;margin-bottom:7px}.resource-link p br{display:none}.resources-section{padding-top:25px;padding-bottom:65px}.takeaway-section{padding:50px 0}.takeaway-section h2{font-size:45px}.footer-top{gap:28px;flex-direction:column}.footer-brand{min-width:0}.credits-grid{width:100%;grid-template-columns:repeat(2,1fr)}.lecture-main{padding-top:45px}.lecture-heading{margin-bottom:42px}.lecture-heading h1{font-size:57px}.lecture-layout{grid-template-columns:1fr;gap:35px}.lecture-sidebar{position:static}.lecture-sidebar>span{margin-bottom:10px}.lecture-sidebar nav{display:flex;flex-direction:row;overflow:auto;gap:12px;margin-bottom:15px;padding-bottom:6px}.chapter-link{white-space:nowrap;border-left:0;border-bottom:2px solid transparent;font-size:14px;gap:7px;padding:7px 0}.chapter-link.active{padding-left:0;background:transparent;border-bottom-color:var(--accent)}.lecture-sidebar>.inline-link{display:none}.chapter{padding-bottom:35px;margin-bottom:35px}.chapter h2{font-size:36px}.lecture-conclusion{margin:0 0 50px;padding:25px}.lecture-conclusion h2{font-size:36px}.presentation-top{padding:15px 20px}.presentation-top>span{font-size:12px}.presentation-tools button{font-size:14px;padding:5px 8px}.slide-stage{padding:25px 6vw}.slide-inner h2{font-size:40px}.slide-lead{font-size:18px}.slide-points li{font-size:16px}.slide-formula{font-size:28px}.presentation-bottom{padding:15px 20px;flex-wrap:wrap;gap:12px}.slide-count{min-width:48px;font-size:14px}.slide-progress{gap:4px}.slide-progress button{width:12px}.slide-key-hint{display:none}.slide-nav button{padding:7px 11px;font-size:14px}.slide-footnote{font-size:12px}}
@media(max-width:450px){.hero h1{font-size:65px}.hero-intro{font-size:18px}.hero .eyebrow{font-size:12px}.hero-actions{gap:20px}.button{font-size:14px;padding:11px 17px;gap:18px}.hero-note{font-size:12px;gap:5px}.day-paper{padding:23px}.question-strip .container{gap:13px}.question-strip .eyebrow{width:83px;font-size:12px}.question-strip p{font-size:19px}.desktop-break{display:none}.section-heading h2{font-size:39px}.lesson-end{align-items:flex-start;flex-direction:column;gap:12px}.panel-content{padding-left:0}.lesson-toggle p{max-width:260px}.formula-box .expression{font-size:23px}.credits-grid{column-gap:17px}.footer-bottom{gap:15px}.slide-inner h2{font-size:32px}.slide-lead{font-size:16px}.slide-points li{font-size:16px}.slide-formula{font-size:24px}.presentation-top>span{letter-spacing:.06em}.presentation-bottom .slide-nav{width:100%;justify-content:space-between}.lecture-heading h1{font-size:49px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation:none!important;transition:none!important}.reveal{opacity:1;transform:none}}
.hero-visual{isolation:isolate}.lesson-title{display:block;margin:0 0 5px;font-size:19px;font-weight:500;letter-spacing:-.04em;line-height:1.4}.lesson-summary{display:block;font-size:14px;color:var(--muted)}.lesson-toggle:hover .lesson-title{color:var(--accent)}
.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.model-heading{font-size:17px;font-weight:500;margin:35px 0 0}
@media(max-width:800px){.lesson-title{font-size:17px}.lesson-summary{font-size:14px}}
@media(max-width:450px){.lesson-summary{max-width:260px}}
@media print{#site-header,#site-footer,.lecture-sidebar,[data-present],.hero-actions,.presentation-dialog{display:none!important}.container{width:100%}.lecture-layout{display:block}.chapter{break-inside:avoid}.reveal{opacity:1;transform:none}.lecture-conclusion{margin:0}body{background:white}}