@font-face{font-family:Be;src:url('fonts/BeVietnamPro_Regular.ttf');font-display:swap}
@font-face{font-family:Be;src:url('fonts/BeVietnamPro_SemiBold.ttf');font-weight:600;font-display:swap}
@font-face{font-family:ZOMath;src:url('fonts/STIXTwoMath.ttf');font-display:swap}
:root{--ink:var(--zo-gray-8);--muted:var(--zo-gray-7);--red:var(--zo-red-5);--red-light:var(--zo-red-1);--paper:var(--zo-gray-2);--line:var(--zo-gray-3);--yellow:var(--zo-yellow-4);--inset:0px;--canvas:var(--zo-gray-3)}
*{box-sizing:border-box}html{scrollbar-gutter:stable;scroll-behavior:auto}body{margin:0;background:var(--canvas);color:var(--ink);font:15px/1.7 Be,Arial,sans-serif;-webkit-font-smoothing:antialiased}button,input,select{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:default}a{color:inherit;text-decoration:none}a:hover{background:transparent}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--zo-yellow-5);outline-offset:4px}button{color:inherit}svg,img{vertical-align:middle}img{max-width:100%;height:auto}h1,h2,h3,h4,p{margin-top:0}h1,h2,h3,h4{font-weight:600;text-wrap:pretty}h1{font-size:54px;line-height:1.25;letter-spacing:-2px}h2{font-size:29px;line-height:1.4;letter-spacing:-.8px}h3{font-size:20px;line-height:1.5;letter-spacing:-.35px}p{margin-bottom:18px}[hidden]{display:none!important}[id]{scroll-margin-top:100px}.icon{width:21px;height:21px;flex-shrink:0}.eyebrow{font-size:10px;letter-spacing:1.5px;font-weight:600;line-height:1.6}.red{color:var(--red)}.visually-hidden{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}.skip-link{position:fixed;top:-100px;left:16px;background:white;padding:12px;z-index:200}.skip-link:focus{top:10px}.button{display:inline-flex;align-items:center;justify-content:center;gap:18px;min-height:47px;padding:12px 20px;border:1px solid transparent;border-radius:7px;font-size:13px;font-weight:600;line-height:1.5;text-align:center;transition:background .16s,transform .16s}.button.primary{background:var(--red);color:white}.button.primary:hover{background:var(--zo-red-6)}.button.secondary{background:white;border-color:var(--line)}.button.secondary:hover{border-color:var(--ink);background:white}.button.text{padding-inline:0;background:transparent;color:var(--ink)}.button.text:hover{color:var(--red)}.button .icon{width:18px;height:18px}.icon-button{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;min-width:40px;background:transparent;border:1px solid transparent;border-radius:6px;padding:7px}.icon-button:hover{background:var(--zo-gray-2)}.icon-button[aria-pressed=true]{color:var(--red);background:var(--red-light)}.icon-button[aria-pressed=true] .icon{fill:var(--zo-red-2)}.plain-button{border:0;background:transparent;text-decoration:none;font-size:12px;color:var(--muted);padding:8px}.text-link{display:inline-flex;align-items:center;gap:16px;color:var(--red);font-size:13px;font-weight:600}.text-link:hover{text-decoration:none}
.site-header{height:80px;padding:0 max(30px,calc((100vw - 1280px)/2));display:flex;align-items:center;gap:28px;background:#FFFFFF;border-bottom:1px solid var(--line);position:sticky;top:0;z-index:40}.brand{display:flex;align-items:center;flex-shrink:0}.brand img{width:118px;height:auto}.course-tag{border-left:1px solid var(--line);padding-left:24px;font-size:10px;letter-spacing:1.1px;color:var(--muted);white-space:nowrap}.global-nav{display:flex;align-self:stretch;align-items:stretch;gap:31px;margin:auto}.global-nav a{display:flex;align-items:center;position:relative;font-size:13px;color:var(--muted)}.global-nav a:hover,.global-nav a[aria-current]{color:var(--ink)}.global-nav a[aria-current]{color:var(--zo-red-5);border-color:var(--zo-red-4);background:var(--zo-red-1)}.header-saved{display:flex;align-items:center;gap:8px;font-size:12px;min-height:44px}.header-saved:hover,.header-saved[aria-current]{color:var(--red)}.saved-count{font-size:10px;background:var(--red);color:white;width:19px;height:19px;display:grid;place-items:center;border-radius:50%}
.home-main{width:100%;max-width:1280px;margin:0 auto;padding:0 38px}.hero{display:grid;grid-template-columns:1.25fr 1fr;gap:55px;padding:70px 0 58px;align-items:center;border-bottom:1px solid var(--line)}.hero-copy .eyebrow{margin-bottom:24px}.hero h1{font-size:57px;line-height:1.28;letter-spacing:-2.2px;margin:0 0 22px}.hero h1 span{color:var(--red)}.hero-copy>p{color:var(--muted);font-size:15px;line-height:1.9;margin:0 0 28px}.hero-actions{display:flex;align-items:center;gap:25px;flex-wrap:wrap}.hero-map{position:relative;padding:21px 0 0 30px;max-width:400px;justify-self:end;width:100%}.map-caption{font-size:9px;letter-spacing:1.25px;font-weight:600;margin:0 0 25px;color:var(--muted);display:flex;gap:9px;align-items:center}.dot{width:6px;height:6px;border-radius:50%;background:var(--red)}.map-stem{position:absolute;left:56px;top:90px;bottom:65px;border-left:1px dashed var(--zo-gray-4);transform:rotate(-13deg);transform-origin:top}.map-step{display:flex;align-items:center;gap:15px;background:white;border:1px solid var(--line);padding:13px 17px;border-radius:9px;width:85%;position:relative;box-shadow:0 4px 0 rgb(223 215 202 / 0.33)}.map-step:hover{border-color:var(--zo-gray-5);background:#FFFFFF;transform:translateX(3px)}.map-step small{display:block;font-size:8px;letter-spacing:1.25px;color:var(--muted);line-height:1.5;margin-bottom:3px}.map-step strong{font-size:14px;font-weight:600}.step-symbol{display:grid;place-items:center;width:38px;height:38px;background:var(--zo-gray-2);border-radius:6px}.step-one .step-symbol{background:var(--zo-red-1);color:var(--red)}.map-index{margin-left:auto;font-size:10px;color:var(--zo-gray-6)}.step-two{margin:12px 0 0 21px}.step-three{margin:12px 0 0 42px}.step-four{margin:12px 0 0 63px}.step-four .step-symbol{background:var(--zo-yellow-2)}.hero-map>p{font-size:10px;color:var(--muted);text-align:right;margin:20px 0 0}.section-heading{display:flex;justify-content:space-between;align-items:end;gap:20px;margin:0 0 23px}.section-heading h2{margin:6px 0 0}.section-heading .eyebrow{color:var(--muted);font-size:9px}.intent-section{padding:40px 0 42px}.intent-section h2{font-size:23px}.intent-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:11px}.intent{display:flex;gap:11px;align-items:center;position:relative;text-align:left;padding:18px 15px;background:transparent;border:1px solid var(--line);border-radius:7px;min-width:0}.intent-number{position:absolute;right:11px;top:5px;font-size:8px;color:var(--zo-gray-6)}.intent>span:not(.intent-number){display:block;flex:1}.intent strong{display:block;font-size:13px;font-weight:600}.intent small{display:block;color:var(--muted);font-size:9px;line-height:1.6;margin-top:4px}.intent>.icon:first-of-type{width:20px}.intent>.icon:last-child{display:none}.intent:hover{border-color:var(--zo-gray-5)}.intent[aria-pressed=true]{border-color:var(--red);background:var(--red-light)}.intent[aria-pressed=true]>.icon{color:var(--red)}.resume-strip{display:flex;align-items:center;gap:16px;border-bottom:1px solid var(--line);padding:21px 0}.resume-strip>.icon{color:var(--red)}.resume-strip div{flex:1}.resume-strip small{font-size:10px;color:var(--muted)}.resume-strip strong{font-size:13px;font-weight:600;display:block}.resume-strip a{font-size:12px;display:flex;align-items:center;gap:12px;color:var(--red)}.catalog{padding:23px 0 50px}.catalog-total{font-size:11px;color:var(--muted);white-space:nowrap}.catalog-controls{display:flex;gap:24px;align-items:center;justify-content:space-between}.search-box{display:flex;align-items:center;gap:11px;flex:1;max-width:470px;background:white;border:1px solid var(--line);border-radius:7px;padding:0 14px;min-height:47px;color:var(--muted)}.search-box input{background:transparent;border:0;outline:none;width:100%;font-size:12px;padding:13px 0;min-width:0;color:var(--ink)}.search-box:focus-within{outline:2px solid var(--zo-yellow-5);outline-offset:2px}.search-box input:focus-visible{outline:none}.search-box .icon{width:18px}.filter-group{display:flex;align-items:center;gap:5px}.filter-group button{border:0;background:transparent;padding:10px 15px;border-radius:6px;font-size:11px;white-space:nowrap}.filter-group button[aria-pressed=true]{background:var(--ink);color:white}.filter-group button:hover:not([aria-pressed=true]){background:var(--zo-gray-2)}.filter-status{font-size:10px;color:var(--muted);margin:15px 0 18px;min-height:17px}.course-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.course-card{position:relative;min-width:0;background:white;border:1px solid var(--line);border-radius:9px;overflow:hidden;display:flex;flex-direction:column;transition:box-shadow .18s,border-color .18s}.course-card:hover{border-color:var(--zo-gray-4);box-shadow:0 8px 28px rgb(62 58 53 / 0.04)}.card-top{display:flex;justify-content:space-between;align-items:center;padding:13px 15px 0 23px}.card-top .eyebrow{font-size:9px;color:var(--muted)}.card-top .icon-button{width:33px;height:33px;min-width:33px}.card-top .icon{width:17px;height:17px}.card-link{display:flex;flex:1;flex-direction:column;padding:0 23px 21px}.card-link:hover{background:transparent}.card-art{height:143px;margin:4px 0 16px;border-bottom:1px solid var(--zo-gray-2);padding:8px 0 15px;display:flex;justify-content:center;align-items:center}.card-art img{width:100%;max-height:119px;object-fit:contain}.course-card h3{font-size:18px;line-height:1.5;margin:0 0 10px;letter-spacing:-.4px}.course-card p{font-size:11px;line-height:1.85;color:var(--muted);margin:0 0 22px}.card-action{margin-top:auto;padding-top:16px;border-top:1px solid var(--zo-gray-2);font-size:11px;font-weight:600;display:flex;align-items:center;justify-content:space-between}.card-action .icon{width:18px}.starting-point{background:var(--zo-gray-2);border-radius:9px;padding:36px 40px;display:flex;align-items:center;gap:28px;margin-bottom:40px}.start-symbol{display:grid;place-items:center;width:60px;height:60px;flex-shrink:0;background:var(--yellow);border-radius:50%;color:var(--zo-gray-8)}.start-symbol .icon{width:27px;height:27px}.starting-point>div:not(.start-symbol){flex:1}.starting-point .eyebrow{font-size:9px;color:var(--zo-gray-7)}.starting-point h2{font-size:24px;margin:8px 0 10px;line-height:1.45}.starting-point p{max-width:510px;font-size:12px;color:var(--muted);margin:0}.starting-point .button{flex-shrink:0}.learning-note{padding:24px 0 56px;display:flex;align-items:center;gap:24px}.note-mark{font:100px/.6 Georgia,serif;color:var(--red);align-self:start;margin-top:13px}.learning-note p{font-size:20px;letter-spacing:-.5px;line-height:1.6;margin:0}.learning-note strong{font-weight:600}.learning-note>a{margin-left:auto;display:flex;align-items:center;gap:14px;font-size:11px;color:var(--muted)}.site-footer{display:flex;justify-content:space-between;gap:22px;max-width:1204px;padding:28px 0;margin:0 auto;border-top:1px solid var(--line);color:var(--muted);font-size:10px}.footer-dot{padding:0 9px}.site-footer>a{text-decoration:none;text-underline-offset:4px}
/* One new shell for every published package; the copied learning DOM stays intact. */
.site-reader{background:white;font-size:16px}.site-reader .site-header{padding-inline:28px;height:70px}.reader-shell{display:grid;grid-template-columns:245px minmax(0,1fr);max-width:1700px;margin:auto}.reader-sidebar{background:var(--zo-gray-2);border-right:1px solid var(--line);position:sticky;top:70px;height:calc(100dvh - 70px);overflow-y:auto;align-self:start;scrollbar-width:thin}.nav-inner{padding:27px 17px 25px}.nav-course{padding:0 13px 23px;border-bottom:1px solid var(--line);margin-bottom:20px}.nav-course .eyebrow{font-size:9px;color:var(--muted);display:block;margin-bottom:9px}.nav-course strong{font-size:14px;line-height:1.65;font-weight:600;display:block}.nav-label{display:block;font-size:8px;letter-spacing:1.05px;color:var(--zo-gray-7);font-weight:600;line-height:1.6}.lesson-nav .nav-label{padding:0 12px;margin:22px 0 9px}.lesson-nav .nav-label:first-child{margin-top:0}.lesson-nav>a{display:flex;align-items:center;gap:11px;font-size:12px;padding:10px 13px;border-radius:5px;min-height:42px;margin:2px 0}.lesson-nav>a .icon{width:17px;height:17px;color:var(--zo-gray-7)}.lesson-nav>a:hover{background:var(--zo-gray-2)}.lesson-nav>a[aria-current=page]{background:var(--zo-red-1);color:var(--zo-red-5);font-weight:600}.lesson-nav>a[aria-current=page] .icon{color:var(--zo-red-5)}.course-switcher{margin:25px 9px 0;padding-top:20px;border-top:1px solid var(--line)}.course-switcher summary{font-size:11px;font-weight:600;padding:4px 20px 4px 0;line-height:1.7}.course-switcher summary:after{font-size:18px;top:1px}.course-switcher nav{padding-top:10px}.course-switcher a{display:block;padding:8px 0;font-size:10px;line-height:1.65;color:var(--muted)}.course-switcher a:hover{color:var(--red)}.course-switcher small{display:block;font-size:8px}.reader-main{width:auto;max-width:none;margin:0;padding:30px 44px 90px;min-width:0}.reader-breadcrumb{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:10px;margin:0 0 28px}.reader-breadcrumb .icon{width:12px;height:12px}.reader-breadcrumb a:hover{text-decoration:none}.lesson-heading{max-width:890px}.lesson-heading>.eyebrow{font-size:9px;margin-bottom:14px}.lesson-heading h1{font-size:38px;line-height:1.35;letter-spacing:-1.4px;margin:0 0 16px;max-width:790px}.lesson-heading>p{font-size:13px;color:var(--muted);line-height:1.85;max-width:730px;margin-bottom:23px}.reader-tools{display:flex;align-items:center;justify-content:space-between;border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin-bottom:30px;min-height:53px;gap:16px;background:white;position:sticky;top:70px;z-index:20}.reader-tools>span{font-size:12px;font-weight:600}.reader-tools>div{display:flex;gap:2px}.reader-tools .icon-button{width:35px;min-width:35px;height:35px}.reader-tools .icon{width:18px;height:18px}.small-a{font-size:9px;margin-left:1px;align-self:center}.reading-layout{display:grid;grid-template-columns:minmax(0,1fr) 180px;gap:43px;align-items:start}.reading-column{min-width:0;max-width:810px}.reading-outline{position:sticky;top:151px;padding-left:21px;border-left:1px solid var(--line);font-size:11px;max-height:calc(100dvh - 180px);overflow-y:auto;scrollbar-width:thin}.reading-outline>.nav-label{margin-bottom:15px}.reading-outline nav a{display:block;color:var(--muted);font-size:10px;line-height:1.65;padding:6px 0}.reading-outline nav a:hover,.reading-outline nav a[aria-current]{color:var(--red)}.outline-help{margin-top:24px;padding-top:20px;border-top:1px solid var(--line)}.outline-help>span{font-size:10px;font-weight:600;display:flex;gap:7px;align-items:center}.outline-help .icon{width:15px;height:15px}.outline-help p{font-size:10px;color:var(--muted);margin:9px 0}.outline-help a{display:flex;justify-content:space-between;font-size:10px;padding:5px 0;color:var(--red)}.overview-intro{font-size:18px;letter-spacing:-.4px;margin:4px 0 20px}.overview-modes{display:grid;grid-template-columns:1fr 1fr;gap:12px}.overview-mode{display:flex;align-items:center;gap:13px;border:1px solid var(--line);padding:19px 16px;border-radius:7px;min-width:0}.overview-mode:hover{background:var(--paper);border-color:var(--zo-gray-5)}.overview-mode>span{color:var(--red);align-self:start;margin-top:3px}.overview-mode>div{flex:1;min-width:0}.overview-mode h3{font-size:14px;margin:0 0 5px}.overview-mode p{font-size:10px;line-height:1.7;color:var(--muted);margin:0}.overview-mode>.icon{width:16px}.soft-note{font-size:11px;line-height:1.85;background:var(--zo-yellow-1);border-radius:5px;padding:15px 18px;margin:22px 0;color:var(--zo-gray-8)}.course-overview>.text-link{font-size:11px}.overview-art{margin:36px 0 0;border-top:1px solid var(--line);padding:30px;display:flex;justify-content:center}.overview-art img{width:330px;height:220px;object-fit:contain;max-width:100%}.d0-actions{display:flex;flex-wrap:wrap;gap:12px}.d0-actions .button{font-size:12px}.reader-content{font-size:16px;line-height:1.9;max-width:100%;min-width:0;width:auto;margin:0;padding:0;overflow-wrap:break-word}.reader-content>.level2{margin:0;padding:0}.reader-content h2{font-size:27px;line-height:1.5;letter-spacing:-.6px;margin:0 0 22px}.reader-content h3{font-size:21px;line-height:1.5;letter-spacing:-.4px;margin:30px 0 18px}.reader-content h4{font-size:18px;line-height:1.6;letter-spacing:-.25px;margin:26px 0 16px}.reader-content p{margin-bottom:19px}.reader-content a{color:var(--zo-red-5);text-decoration:none;text-underline-offset:3px}.reader-content a:hover{color:var(--zo-red-6)}.reader-content .reading-region{background:transparent;border:0;border-radius:0;padding:0;margin:0 0 28px}.reader-content .reading-region>.reading-region{margin-bottom:22px}.reader-content .reading-region:last-child{margin-bottom:0}.reader-content .role{font-size:9px;letter-spacing:1px;color:var(--muted);margin:0 0 9px}.reader-content ul,.reader-content ol{padding-left:1.5em}.reader-content li{margin-bottom:10px}.reader-content math{font-family:ZOMath,math;font-size:1.06em}.reader-content math[display=block]{display:block math;overflow-x:auto;max-width:100%;padding:8px 0;margin:12px 0}.reader-content annotation{display:none}.reader-content details{border:1px solid var(--line);border-radius:6px;background:var(--zo-gray-1);padding:16px 19px;margin:20px 0}.reader-content summary{font-size:14px;line-height:1.7;font-weight:600;min-height:24px;padding-right:26px}.reader-content summary:after{font-size:20px;line-height:1.2}.reader-content details .reading-region{margin-bottom:16px}.reader-content .zo-block-body,.reader-content .solution-body{padding-top:16px}.reader-content .zo-learning-task{padding:20px 0;border-top:1px solid var(--line);margin:25px 0}.reader-content .zo-learning-task>h3,.reader-content .zo-learning-task>h4{margin-top:0}.reader-content .zo-block{border-radius:6px}.reader-content .zo-block-yellow:not(details){padding:22px;background:var(--zo-yellow-1);margin:22px 0}.reader-content .zo-block-red:not(details){padding:22px;background:var(--zo-red-1);margin:22px 0}.reader-content .zo-block-gray:not(details){padding:22px;background:var(--zo-gray-2);margin:22px 0}.reader-content .table-scroll,.reader-content .figure-viewport,.reader-content .safe-table-scroll{max-width:100%;overflow-x:auto;overscroll-behavior-x:contain;scrollbar-width:thin}.reader-content table{font-size:inherit;line-height:1.75}.reader-content th,.reader-content td{padding:10px;border-color:var(--line)}.reader-content table:not(.zo-variation-native){border-collapse:collapse}.reader-content table:not(.zo-variation-native) th{background:var(--zo-gray-2)}.reader-content .safe-table-scroll>table{min-width:480px;width:100%}.reader-content .safe-table-scroll{margin-bottom:22px}.reader-content .figure-viewport img.zo-graph-04,.reader-content figure img.math-illustration{width:var(--figure-em);max-width:none;height:auto}.reader-content img:not(.zo-graph-04):not(.math-illustration){max-width:100%;height:auto}.reader-content figure{max-width:100%;margin:25px 0}.reader-content figcaption{font-size:11px;line-height:1.65;color:var(--muted);margin-top:12px}.reader-content .zo-source-note{font-size:11px;line-height:1.7;color:var(--muted)}.reader-content .zo-download-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.reader-content .zo-download-card{border:1px solid var(--line);background:var(--paper);padding:18px;border-radius:6px}.reader-content .support-region{margin-top:35px;padding-top:25px;border-top:1px solid var(--line)}.reader-content .support-brand img{width:110px}.reader-content .support-region p{font-size:12px}.reader-content [id]{scroll-margin-top:140px}.context-return{display:flex;align-items:center;gap:12px;background:var(--zo-yellow-1);border:1px solid var(--zo-yellow-2);border-radius:7px;padding:15px 17px;margin:-9px 0 27px}.context-return>.icon{width:18px;color:var(--zo-gray-7)}.context-return>div{flex:1;min-width:0}.context-return small{display:block;font-size:8px;letter-spacing:.9px;color:var(--zo-gray-7)}.context-return strong{font-size:11px;font-weight:600;display:block}.context-return button{border:0;background:transparent;font-size:11px;font-weight:600;display:flex;align-items:center;gap:12px}.context-return button .icon{width:17px}.next-step{border-top:1px solid var(--line);margin-top:40px;padding-top:25px;display:flex;align-items:center;justify-content:space-between;gap:18px;font-size:11px}.next-step a{color:var(--red);display:flex;gap:15px;align-items:center}.next-step .icon{width:18px}.mobile-reader-bar,.mobile-nav-close,.nav-scrim,.exit-focus{display:none}.focus-on .reader-sidebar,.focus-on .reading-outline,.focus-on .site-header,.focus-on .mobile-reader-bar{display:none}.focus-on .reader-shell{display:block;max-width:900px}.focus-on .reader-main{padding-top:30px}.focus-on .reading-layout{display:block}.focus-on .reader-tools{top:0}.focus-on .exit-focus{display:inline-flex;position:fixed;right:25px;bottom:24px;z-index:45;box-shadow:0 3px 15px rgb(62 58 53 / 0.07);font-size:11px}.large-type .reader-content{font-size:18px}.nav-open{overflow:hidden}
.utility-main{max-width:1000px;width:calc(100% - 76px);margin:60px auto 90px;padding:0}.utility-main>.eyebrow{display:block;margin-bottom:22px}.utility-main>h1{font-size:46px;margin:0 0 24px;line-height:1.35;letter-spacing:-1.8px}.utility-intro{font-size:15px;color:var(--muted);max-width:740px;line-height:1.95;margin-bottom:40px}.empty-state{text-align:center;padding:65px 20px;border:1px dashed var(--zo-gray-4);border-radius:8px;background:white}.empty-state>.icon{width:36px;height:36px;color:var(--zo-gray-6);margin-bottom:20px}.empty-state h2,.empty-state h3{font-size:22px;margin-bottom:14px}.empty-state p{font-size:12px;color:var(--muted);line-height:1.9;margin-bottom:22px}.local-note{font-size:11px;color:var(--muted);margin-top:25px}.saved-item{padding:23px 0;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:25px}.saved-item .saved-item-link{flex:1;min-width:0}.saved-item small{font-size:9px;color:var(--red);letter-spacing:1px}.saved-item h2{font-size:18px;margin:5px 0 7px}.saved-item p{font-size:12px;color:var(--muted);margin:0}.saved-item button{font-size:11px;border:0;background:transparent;padding:10px;color:var(--muted)}.saved-item>a:hover h2{text-decoration:none;text-underline-offset:4px}.guide-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}.guide-step{position:relative;padding:29px;background:white;border:1px solid var(--line);border-radius:8px}.guide-step>.icon{color:var(--red);width:26px;height:26px;margin-bottom:20px}.guide-step h2{font-size:25px;margin-bottom:16px}.guide-step p{font-size:13px;color:var(--muted);line-height:1.9}.guide-number{position:absolute;right:26px;top:25px;font-size:12px;color:var(--zo-gray-6)}.guide-step>.button{font-size:11px;text-align:left;justify-content:start}.guide-support{padding:35px 0}.guide-support h2{font-size:26px}.guide-support p{font-size:14px;line-height:1.95;color:var(--muted)}.starting-point.compact{padding:25px;margin-top:10px}.compact h2{font-size:20px}.design-review section{border-top:1px solid var(--line);padding:30px 0 10px}.design-review section h2{font-size:25px}.design-review section p,.review-list{font-size:14px;line-height:1.95;color:var(--muted)}.review-list{padding-left:25px}.review-list li{padding:0 0 18px 5px}.review-list strong{color:var(--ink)}.priority-list{display:grid;grid-template-columns:110px 1fr;gap:20px;font-size:13px;line-height:1.9}.priority-list dt{color:var(--red);font-weight:600}.priority-list dd{margin:0;color:var(--muted)}.review-links a{display:block;padding:13px 0;color:var(--red);font-size:13px;text-decoration:none;text-underline-offset:4px}.toast{position:fixed;bottom:28px;left:50%;transform:translateX(-50%);background:var(--ink);color:white;padding:13px 21px;border-radius:7px;font-size:12px;z-index:100;box-shadow:0 5px 25px rgb(62 58 53 / 0.13);max-width:calc(100% - 32px);width:max-content;text-align:center}dialog{border:1px solid var(--line);border-radius:12px;padding:33px;max-width:490px;width:calc(100% - 36px);color:var(--ink);box-shadow:0 20px 80px rgb(62 58 53 / 0.2)}dialog::backdrop{background:rgb(62 58 53 / 0.47)}dialog h2{font-size:25px;margin:15px 0}dialog p{font-size:13px;color:var(--muted);line-height:1.9}.dialog-close{float:right;margin:-16px -16px 0 8px}.dialog-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:25px}.dialog-actions .button{font-size:12px}
@media(min-width:1500px){.reader-main{padding-inline:60px}.reading-layout{grid-template-columns:minmax(0,810px) minmax(170px,210px);gap:55px}}
@media(max-width:1190px){.site-header{padding-inline:28px;gap:22px}.home-main{padding-inline:30px}.hero{gap:24px;padding-top:55px}.hero h1{font-size:49px}.hero-map{padding-left:0;max-width:350px}.map-stem{left:25px}.step-four{margin-left:50px}.step-three{margin-left:34px}.step-two{margin-left:17px}.intent{padding:16px 12px;gap:9px}.intent small{font-size:8px}.card-link{padding-inline:20px}.course-card h3{font-size:17px}.starting-point{padding:30px;gap:20px}.start-symbol{display:none}.reader-shell{grid-template-columns:220px minmax(0,1fr)}.reader-main{padding:27px 30px 85px}.reading-layout{grid-template-columns:minmax(0,1fr) 150px;gap:28px}.reading-outline{padding-left:16px}.overview-modes{grid-template-columns:1fr}.overview-mode{padding:16px}.overview-mode p{font-size:11px}.lesson-heading h1{font-size:34px}.site-footer{margin-inline:30px}.global-nav{gap:24px}}
@media(max-width:1000px){.reading-layout{display:block}.reading-outline{display:none}.course-grid{gap:14px}.card-art{height:122px}.card-art img{max-height:100px}.hero h1{font-size:44px}.hero-actions{gap:18px}.hero-actions .button{font-size:11px;padding-inline:15px}.hero-actions .text{padding-inline:0}.hero-map{max-width:300px}.map-step{padding:11px 13px}.step-four{margin-left:38px}.step-three{margin-left:26px}.step-two{margin-left:13px}.intent-grid{grid-template-columns:1fr 1fr}.intent{padding:16px 19px}.intent small{font-size:10px}.intent>.icon:last-child{display:block;width:15px}.intent-number{display:none}.intent>.icon:first-of-type{width:22px;margin-right:5px}.overview-modes{grid-template-columns:1fr 1fr}.overview-mode>.icon:last-child{display:none}.starting-point h2{font-size:23px}.starting-point .button{font-size:11px}.learning-note p{font-size:18px}.learning-note>a{max-width:220px;line-height:1.8;font-size:10px}.global-nav{gap:18px}.site-header{gap:18px}.course-tag{padding-left:18px;font-size:9px}}
@media(max-width:760px){.site-header,.site-reader .site-header{height:66px;padding:0 20px;gap:17px}.brand img{width:104px}.course-tag{font-size:8px;padding-left:16px;letter-spacing:.8px}.global-nav{display:none}.header-saved{margin-left:auto;font-size:11px}.header-saved .icon{width:19px}.home-main{padding:0 22px}.hero{grid-template-columns:1fr;padding:40px 0 32px;gap:25px}.hero-copy .eyebrow{font-size:9px;margin-bottom:18px}.hero h1{font-size:43px;line-height:1.3;letter-spacing:-1.9px;margin-bottom:20px}.hero-copy>p{font-size:12px;line-height:1.95;margin-bottom:23px}.hero-actions{gap:16px}.hero-actions .button{font-size:11px;min-height:45px;padding:12px 15px;gap:10px}.hero-actions .button.text{padding-inline:0}.hero-map{max-width:none;justify-self:stretch;padding:21px 0 0;border-top:1px solid var(--line);display:grid;grid-template-columns:1fr 1fr;gap:9px}.map-caption{grid-column:1/-1;margin:0 0 5px;font-size:8px}.map-stem{display:none}.map-step{width:100%;margin:0;border-radius:6px;box-shadow:none;padding:11px;gap:10px}.step-symbol{width:30px;height:32px;border-radius:4px}.step-symbol .icon{width:17px;height:17px}.map-step small{font-size:7px;letter-spacing:.7px}.map-step strong{font-size:11px}.map-index{display:none}.hero-map>p{grid-column:1/-1;font-size:9px;margin:5px 0 0;text-align:left}.section-heading{margin-bottom:20px;gap:12px}.section-heading h2,.intent-section h2{font-size:23px;letter-spacing:-.6px;line-height:1.5}.section-heading .eyebrow{font-size:8px}.intent-section{padding:30px 0}.intent-grid{gap:9px}.intent{padding:14px 11px;gap:10px;align-items:start}.intent>.icon:first-of-type{width:18px;height:18px;margin:2px 0 0}.intent>.icon:last-child{display:none}.intent strong{font-size:12px}.intent small{font-size:9px;line-height:1.7}.catalog{padding:10px 0 32px}.catalog .section-heading{display:block}.catalog-total{font-size:9px;display:block;margin-top:9px}.catalog-controls{flex-direction:column;align-items:stretch;gap:13px}.search-box{max-width:none;min-height:44px}.search-box input{font-size:11px}.filter-group{gap:7px;justify-content:start}.filter-group button{font-size:10px;padding:9px 14px}.filter-status{margin:13px 0 17px;font-size:9px}.course-grid{grid-template-columns:1fr 1fr;gap:12px}.card-top{padding:10px 9px 0 16px}.card-top .eyebrow{font-size:8px;letter-spacing:.7px}.card-top .icon-button{width:30px;height:30px;min-width:30px}.card-top .icon{width:16px;height:16px}.card-link{padding:0 16px 17px}.card-art{height:120px;margin:0 0 13px;padding-bottom:15px}.card-art img{max-height:100px}.course-card h3{font-size:16px;letter-spacing:-.3px}.course-card p{font-size:10px;margin-bottom:17px}.card-action{font-size:9px;padding-top:13px}.card-action .icon{width:15px}.starting-point{display:block;padding:27px 24px;margin-bottom:22px}.starting-point .eyebrow{font-size:8px}.starting-point h2{font-size:24px;margin:12px 0}.starting-point p{font-size:11px;line-height:1.95}.starting-point .button{margin-top:22px;font-size:11px}.learning-note{display:grid;grid-template-columns:32px 1fr;gap:7px 12px;padding:25px 0 36px}.note-mark{font-size:76px;margin-top:12px}.learning-note p{font-size:16px;letter-spacing:-.3px}.learning-note>a{grid-column:2;max-width:none;margin:12px 0 0;font-size:9px}.site-footer{margin:0 22px;padding:23px 0;flex-direction:column;gap:12px;font-size:9px}.resume-strip{gap:10px;padding:18px 0;align-items:start}.resume-strip>.icon{width:18px;height:18px;margin-top:4px}.resume-strip strong{font-size:11px}.resume-strip small{font-size:9px}.resume-strip a{font-size:10px;gap:7px;max-width:100px;line-height:1.8}.resume-strip a>.icon{width:16px}.reader-shell{display:block}.reader-sidebar{position:fixed;inset:0 auto 0 0;top:0;height:100dvh;width:310px;max-width:85vw;z-index:70;transform:translateX(-105%);transition:transform .2s;box-shadow:10px 0 40px rgb(62 58 53 / 0.07)}.nav-open .reader-sidebar{transform:translateX(0)}.mobile-nav-close{display:flex;position:absolute;top:15px;right:12px}.nav-inner{padding-top:28px}.nav-course{padding-right:35px}.nav-course strong{font-size:15px}.lesson-nav>a{font-size:13px;min-height:43px}.lesson-nav .nav-label{font-size:9px}.nav-scrim{position:fixed;inset:0;background:rgb(62 58 53 / 0.4);z-index:65}.nav-open .nav-scrim{display:block}.reader-main{padding:23px 22px 105px;width:auto;margin:0;max-width:none}.reader-breadcrumb{font-size:9px;margin-bottom:21px}.lesson-heading>.eyebrow{font-size:8px;margin-bottom:12px}.lesson-heading h1{font-size:30px;line-height:1.4;letter-spacing:-1px;margin-bottom:15px}.lesson-heading>p{font-size:12px;line-height:1.9;margin-bottom:23px}.reader-tools{top:66px;margin-bottom:24px;min-height:49px}.reader-tools>span{font-size:11px}.reader-tools .icon-button{height:34px;width:34px;min-width:34px}.reading-layout{display:block}.overview-intro{font-size:16px;line-height:1.8}.overview-modes{grid-template-columns:1fr;gap:10px}.overview-mode{padding:17px;gap:15px}.overview-mode h3{font-size:14px}.overview-mode p{font-size:10px}.overview-mode>.icon:last-child{display:block}.soft-note{font-size:11px;padding:15px;margin-top:18px}.course-overview>.text-link{font-size:11px;line-height:1.8}.overview-art{margin-top:25px;padding:25px 12px}.overview-art img{height:190px}.reader-content{font-size:16px;line-height:1.9}.reader-content h2{font-size:25px;line-height:1.5}.reader-content h3{font-size:21px;line-height:1.5;margin-top:27px}.reader-content h4{font-size:18px}.reader-content details{padding:15px}.reader-content summary{font-size:14px}.reader-content .zo-block-yellow:not(details),.reader-content .zo-block-red:not(details),.reader-content .zo-block-gray:not(details){padding:18px}.reader-content .zo-download-grid{grid-template-columns:1fr}.context-return{flex-wrap:wrap;gap:9px;padding:13px}.context-return>div{flex:1}.context-return strong{font-size:10px}.context-return small{font-size:7px}.context-return button{width:100%;padding-left:25px;justify-content:space-between;font-size:10px}.mobile-reader-bar{display:flex;align-items:center;justify-content:space-between;position:fixed;bottom:0;left:0;right:0;background:white;border-top:1px solid var(--line);min-height:57px;padding:8px 18px calc(8px + env(safe-area-inset-bottom));z-index:35;gap:10px}.mobile-reader-bar button{display:flex;align-items:center;gap:8px;border:0;background:transparent;font-size:11px;padding:9px 2px}.mobile-reader-bar .icon{width:19px;height:19px}.mobile-reader-bar>span{font-size:10px;color:var(--muted)}.mobile-reader-bar #mobile-save{width:34px;justify-content:center}.toast{bottom:78px;font-size:11px;padding:12px 17px}.utility-main{width:calc(100% - 44px);margin:38px auto 60px}.utility-main>h1{font-size:35px;line-height:1.4;letter-spacing:-1.2px;margin-bottom:22px}.utility-main>.eyebrow{font-size:9px;margin-bottom:18px}.utility-intro{font-size:13px;line-height:1.95;margin-bottom:28px}.empty-state{padding:42px 20px}.empty-state h2,.empty-state h3{font-size:21px}.empty-state p{font-size:11px}.empty-state .button{font-size:11px}.guide-grid{grid-template-columns:1fr;gap:15px}.guide-step{padding:25px}.guide-step h2{font-size:24px}.guide-step p{font-size:12px}.guide-support h2{font-size:24px}.guide-support p{font-size:12px}.starting-point.compact{padding:24px}.compact h2{font-size:21px}.saved-item{gap:14px;align-items:start}.saved-item h2{font-size:17px}.saved-item p{font-size:11px}.saved-item .icon{width:19px}.saved-item button{padding:8px 0;font-size:10px}.design-review section h2{font-size:24px}.design-review section p,.review-list{font-size:12px}.priority-list{grid-template-columns:1fr;gap:8px;font-size:12px}.priority-list dd{margin-bottom:13px}.review-links a{font-size:12px}.focus-on .reader-main{padding-inline:22px}.focus-on .reader-tools{top:0}.focus-on .exit-focus{font-size:10px;right:15px;bottom:18px;padding:10px 14px;min-height:40px}.focus-on .toast{bottom:75px}.next-step{font-size:10px}.local-note{font-size:10px}.reader-content [id]{scroll-margin-top:132px}}
@media(max-width:470px){.course-grid{grid-template-columns:1fr}.card-art{height:160px;padding-block:5px 20px}.card-art img{max-height:135px}.card-top{padding:13px 14px 0 22px}.card-link{padding:0 22px 21px}.card-top .eyebrow{font-size:9px}.course-card h3{font-size:20px}.course-card p{font-size:11px;line-height:1.9}.card-action{font-size:11px;padding-top:16px}.card-action .icon{width:18px}.card-top .icon-button{width:35px;height:35px;min-width:35px}.hero h1{font-size:40px}.header-saved>span:not(.saved-count){display:none}.intent-section h2{font-size:22px}}
@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;transition:none!important}}
.context-return{position:sticky;top:123px;z-index:19;margin:0 0 24px}.has-context .reader-content [id]{scroll-margin-top:225px}.focus-on .context-return{top:53px}.has-context.focus-on .reader-content [id]{scroll-margin-top:160px}
.mode-select{display:flex;align-items:center;gap:10px;font-size:10px;color:var(--muted);white-space:nowrap}.mode-select select{padding:11px 29px 11px 12px;background:white;border:1px solid var(--line);border-radius:6px;color:var(--ink);font-size:11px;min-height:44px}.map-step[aria-current]{border-color:var(--red);background:var(--red-light)}
@media(min-width:761px){.hero{padding-block:48px 40px}.hero-map{padding-top:0}.map-step{padding-block:10px}.catalog{padding-top:35px}.catalog-controls{gap:16px}.search-box{max-width:420px}.catalog .section-heading .plain-button{margin-left:auto}.catalog .catalog-total{margin-left:auto}.catalog .section-heading .plain-button:not([hidden])+.catalog-total{margin:0}}
@media(max-width:1100px) and (min-width:761px){.catalog-controls{flex-wrap:wrap}.search-box{flex-basis:55%;max-width:none}.mode-select{margin-left:auto}}
@media(max-width:760px){.mode-select{justify-content:space-between;padding-top:4px}.mode-select select{flex:1;max-width:240px;font-size:11px}.catalog .section-heading .plain-button{margin:5px 0 0;padding:3px 0;font-size:10px}.catalog{padding-top:30px}.context-return{top:115px}.context-return button{min-height:37px}.has-context .reader-content [id]{scroll-margin-top:235px}.has-context.focus-on .reader-content [id]{scroll-margin-top:170px}}
@media print{.site-header,.reader-sidebar,.reader-tools,.reading-outline,.mobile-reader-bar,.context-return,.exit-focus,.site-footer{display:none!important}.reader-shell,.reading-layout{display:block}.reader-main{padding:0;margin:0}.reader-content>[hidden]{display:block!important}.course-overview{display:none}body{background:white}}
/* Route changes restore a saved reading position; browser scroll anchoring
   must not add a second adjustment when the return banner appears. */
.site-reader{overflow-anchor:none}

/* Revision 02: approved ZO palette, course identity and actionable guide. */
.site-header{border-bottom-color:var(--zo-gray-4)}
.global-nav{gap:12px;align-items:center}
.global-nav a{border:1px solid transparent;border-radius:5px;padding:8px 14px;color:var(--zo-gray-8)}
.global-nav a:hover{border-color:var(--zo-red-4);color:var(--zo-red-5);background:var(--zo-red-1)}
.course-tag{color:var(--zo-gray-7);font-size:10px;line-height:1.5;max-width:180px}
.hero{background:white;margin-top:30px;padding:40px;gap:42px;border:1px solid var(--zo-gray-4);border-top:4px solid var(--zo-red-4);border-radius:8px;grid-template-columns:minmax(0,1.3fr) minmax(0,.7fr)}
.hero h1{font-size:52px;letter-spacing:-1.6px;line-height:1.2;max-width:650px}
.hero h1 span{display:block;color:var(--zo-red-5);margin-top:8px}
.hero-copy>p{font-size:16px;color:var(--zo-gray-8);max-width:600px}
.course-hero-art{margin:0;max-width:270px;justify-self:center;width:100%}
.course-hero-art img{display:block;width:100%;height:auto;border-radius:4px}
.button.secondary{border-color:var(--zo-gray-5)}
.button.primary{background:var(--zo-red-5)}
.button.primary:hover{background:var(--zo-red-6)}
.catalog{padding-top:38px}.catalog h2{color:var(--zo-gray-8)}
.card-top{justify-content:flex-end}.course-card:hover{border-color:var(--zo-red-4);box-shadow:none}
.course-card .card-link{display:flex;flex-direction:column;flex:1}.course-card .card-action{margin-top:auto;align-self:flex-start;color:var(--zo-red-5);font-weight:600;padding:8px 0;font-size:13px}
.course-card p{font-size:13px;color:var(--zo-gray-7)}
.course-card .card-action:hover{color:var(--zo-red-6);background:var(--zo-red-1)}
.site-footer{border-top-color:var(--zo-gray-5);font-size:12px}
.site-footer>a{color:var(--zo-red-5)}
.starting-point{border:1px solid var(--zo-gray-4);border-left:4px solid var(--zo-yellow-4);background:white}
.starting-point h2{font-size:26px}.starting-point p{font-size:14px;color:var(--zo-gray-8)}
.guide-main>h1{font-size:42px;letter-spacing:-1px}
.guide-entry{border-left:4px solid var(--zo-yellow-4);background:white;padding:20px 24px;margin:24px 0}
.guide-entry p{margin:0;font-size:16px;line-height:1.85}
.guide-step{border-color:var(--zo-gray-4);border-top:3px solid var(--zo-red-4)}
.guide-step p{font-size:15px;color:var(--zo-gray-8)}
.guide-step>.button{font-size:13px}
.guide-support{background:white;border:1px solid var(--zo-gray-4);border-radius:8px;margin-top:28px;padding:30px}
.guide-support p,.guide-support li{font-size:15px;color:var(--zo-gray-8);line-height:1.9}
.guide-support h2{margin-top:24px}.guide-support h2:first-child{margin-top:0}
.guide-support .home-method-note{background:var(--zo-yellow-1);border-left:4px solid var(--zo-yellow-4);padding:16px}
/* Link states use color and focus, never a line beneath text (ZO005). */
body a,body a:hover,body a:focus,body a:active{ text-decoration:none!important; }
.reader-content a:hover{color:var(--zo-red-6);background:var(--zo-red-1)}
@media(max-width:1000px){.hero{padding:30px;gap:24px}.hero h1{font-size:42px}.course-hero-art{max-width:230px}.course-tag{max-width:145px;font-size:9px}}
@media(max-width:760px){.hero{grid-template-columns:1fr;margin-top:20px;padding:26px 22px;gap:24px}.hero h1{font-size:38px}.hero-copy>p{font-size:15px}.course-hero-art{max-width:180px}.hero-actions .button{font-size:13px}.guide-main>h1{font-size:36px}.guide-entry{padding:18px}.guide-entry p,.guide-step p,.guide-support p,.guide-support li{font-size:15px}.guide-support{padding:22px}.course-card p{font-size:13px}.starting-point p{font-size:14px}.course-tag{max-width:145px;font-size:9px}.site-footer{font-size:12px}.reader-breadcrumb{flex-wrap:wrap}}

.button.text{color:var(--zo-red-5)}.button.text:hover{color:var(--zo-red-6);background:var(--zo-red-1)}

/* Darker approved red keeps small links readable on the gray-3 canvas. */
.resume-strip a,.site-footer>a,.saved-item small,.review-links a,.utility-main>.eyebrow{color:var(--zo-red-6)}

/* Owner correction: no decorative rules or accent borders in the prototype shell. */
.site-header,.course-tag,.hero,.resume-strip,.course-card,.card-art,.card-action,.starting-point,.site-footer,.guide-entry,.guide-step,.guide-support,.guide-support .home-method-note,.reader-sidebar,.nav-course,.course-switcher,.reader-tools,.reading-outline,.outline-help,.overview-mode,.overview-art,.context-return,.next-step,.empty-state,.saved-item,.design-review section,.mobile-reader-bar{border:0}
.course-card:hover,.overview-mode:hover,.global-nav a,.global-nav a:hover,.global-nav a[aria-current]{border:0;box-shadow:none}
.button.secondary{border:0;background:var(--zo-gray-2)}
.button.secondary:hover{background:var(--zo-gray-3)}
.site-header{gap:20px}.global-nav{gap:8px;margin-left:auto;margin-right:20px}
.global-nav a[aria-current]{background:var(--zo-gray-2);color:var(--zo-red-5);font-weight:600}
.hero{margin-top:30px}.course-tag{padding-left:6px}
.course-card{transition:background .18s}.course-card:hover{background:var(--zo-gray-1)}
.topics-main{padding-top:40px}.topics-heading h1{font-size:42px;margin:0 0 12px}.topics-heading>p{color:var(--zo-gray-7);margin:0 0 28px;font-size:16px}
.topics-main .catalog{padding-top:24px;scroll-margin-top:110px}.catalog .filter-tabs{display:flex;gap:6px}.filter-tabs button{border:0;padding:12px 16px;background:var(--zo-gray-2);border-radius:6px;color:var(--zo-gray-8)}.filter-tabs button[aria-pressed=true]{background:var(--zo-gray-8);color:white}
.course-home{padding-bottom:20px}.course-home .hero{padding:48px;grid-template-columns:1.4fr .6fr;gap:60px}
.course-home .hero h1{font-size:56px;line-height:1.15}.course-home .hero-copy>p{font-size:17px;max-width:640px}
.course-home .course-hero-art{max-width:260px}.course-home .course-hero-art img{width:100%;height:auto}
.course-section-nav{display:flex;flex-wrap:wrap;gap:8px 24px;padding:23px 10px}
.course-section-nav a{font-size:14px;font-weight:500;color:var(--zo-gray-8);padding:7px 0}
.course-section-nav a:hover{color:var(--zo-red-6)}
.course-section{background:white;border:0;border-radius:8px;padding:44px;margin:28px 0;scroll-margin-top:110px}
.course-section h2{font-size:30px;line-height:1.4;letter-spacing:-.6px;margin:0 0 22px}
.course-section h3{font-size:19px;line-height:1.5;letter-spacing:-.2px;margin:24px 0 12px}
.course-section p,.course-section li{font-size:16px;line-height:1.9;color:var(--zo-gray-8)}
.course-section .role{font-size:12px;letter-spacing:1px;color:var(--zo-red-5);font-weight:600;display:block;margin:0 0 14px}
.course-introduction{display:grid;grid-template-columns:1.15fr 1fr;gap:42px;align-items:start}
.course-intro-copy>p:first-of-type{margin-top:0}.home-video-audience{margin-top:24px;padding:20px 24px;background:var(--zo-gray-2);border-radius:6px}
.home-video-audience h3{margin-top:0}.home-video-audience p{margin-bottom:0;font-size:15px}
.home-video-media{padding-top:34px;min-width:0}.home-youtube{aspect-ratio:16/9;width:100%;background:var(--zo-gray-8);border-radius:6px;overflow:hidden}
.home-youtube-launch{display:block;width:100%;height:100%;padding:0;border:0;position:relative;cursor:pointer;background:var(--zo-gray-8);color:white}
.home-youtube-launch img{display:block;width:100%;height:100%;object-fit:contain}
.home-youtube-play{position:absolute;bottom:18px;left:50%;transform:translateX(-50%);white-space:nowrap;padding:10px 16px;border-radius:5px;background:var(--zo-red-5);color:white;font-size:12px;font-weight:600}
.home-youtube iframe{display:block;width:100%;height:100%;border:0}.course-home .home-video-caption{font-size:12px;line-height:1.7}.home-video-caption a{color:var(--zo-red-5)}
.course-scope-layout{display:grid;grid-template-columns:minmax(0,1fr) 290px;gap:28px;align-items:start;margin:28px 0}.course-scope{margin:0}.home-strands{display:grid;grid-template-columns:1fr 1fr;gap:16px 28px;margin:26px 0 32px}.home-strands h3{font-size:17px;margin:0;color:var(--zo-gray-8);font-weight:600}
.course-countdown{padding:26px 22px;background:var(--zo-gray-2);border-radius:8px}.countdown-heading{display:flex;gap:12px;justify-content:space-between;font-size:14px;font-weight:600}.countdown-dial{width:28px;height:28px;flex-shrink:0;fill:none;stroke:var(--zo-gray-5);stroke-width:2}.countdown-sweep,.countdown-dial path{stroke:var(--zo-red-5)}.countdown-sweep{stroke-dasharray:60}
.countdown-readout{margin:20px 0;display:flex;gap:20px;align-items:end;font-variant-numeric:tabular-nums}.countdown-days strong{font-size:42px;color:var(--zo-red-5);line-height:1.1}.countdown-days span{display:block;font-size:11px}.countdown-hms{display:flex;gap:4px;padding-bottom:3px}.countdown-hms strong{font-size:17px}.countdown-hms span{display:block;font-size:9px}.countdown-hms b{font-size:14px}.countdown-date,.countdown-notice,.countdown-fallback,.countdown-ended{font-size:12px;line-height:1.8;color:var(--zo-gray-7)}.countdown-notice a{color:var(--zo-red-6)}
.course-section-heading{display:flex;align-items:start;justify-content:space-between;gap:24px}.course-section-heading h2{margin-bottom:12px}.course-section-heading p{margin-bottom:22px}.course-section-heading>.button{flex-shrink:0;font-size:13px}
.course-methods{display:grid;grid-template-columns:repeat(4,1fr);gap:26px;margin:12px 0 30px}.course-method>.icon{width:25px;height:25px;color:var(--zo-red-5)}.course-method h3{margin:14px 0 10px}.course-method p{font-size:14px;line-height:1.8}.course-method a{color:var(--zo-red-5);font-size:13px;display:inline-flex;gap:12px;align-items:center}
.course-entry{display:flex;gap:40px;align-items:center;background:var(--zo-gray-2);padding:28px;border-radius:6px}.course-entry h3{margin-top:0}.course-entry p{font-size:14px;margin-bottom:0}.course-entry .button{flex-shrink:0;background:white}
.course-service{display:grid;grid-template-columns:1fr 1fr;gap:24px 44px;align-items:center}.home-service-illustration{grid-column:1;grid-row:1 / span 2;margin:0}.home-service-art{width:100%;height:auto;display:block}.home-service-copy{grid-column:2;grid-row:1}.home-service-copy h3{margin-top:0}.course-service .home-service-fee{font-size:14px;color:var(--zo-gray-7)}.home-service-status{grid-column:2;background:var(--zo-yellow-1);padding:20px 24px;border-radius:6px}.home-service-status h3{margin-top:0}.home-service-status p{font-size:14px;margin-bottom:0}.home-service-accent{display:none}
.course-trust>p,.course-faq>p{max-width:800px}.course-home details{border:0;background:var(--zo-gray-2);border-radius:6px;padding:18px 24px;margin:14px 0}.course-home summary{font-size:16px;line-height:1.6;font-weight:600;cursor:pointer}.course-home details p{font-size:15px;max-width:800px}
.course-support{display:grid;grid-template-columns:100px 1fr;gap:34px}.support-brand img{width:100%;height:auto}.course-support .r1-support-details{display:flex;gap:28px;align-items:start;margin:26px 0}.course-support .r1-support-qr{width:155px;height:auto}.course-support dl{margin:0;display:grid;gap:10px}.course-support dt{font-size:11px;color:var(--zo-gray-7)}.course-support dd{margin:0;font-size:15px}.course-support a{color:var(--zo-red-5)}
@media(max-width:1000px){.site-header .course-tag{display:none}.course-home .hero{padding:36px;gap:36px}.course-home .hero h1{font-size:44px}.course-section{padding:30px}.course-introduction{gap:28px}.course-scope-layout{grid-template-columns:1fr 260px;gap:22px}.course-methods{grid-template-columns:1fr 1fr}.course-section-heading{display:block}.course-section-heading>.button{padding:0;margin-bottom:20px}}
@media(max-width:760px){.site-header,.site-reader .site-header{height:98px;display:grid;grid-template-columns:1fr auto;grid-template-rows:56px 42px;gap:0;padding:0 22px}.site-header .brand{grid-row:1;grid-column:1}.site-header .header-saved{grid-row:1;grid-column:2}.site-header .course-tag{display:none}.site-header .global-nav{display:flex;grid-row:2;grid-column:1 / -1;margin:0;align-self:center;gap:8px}.global-nav a{font-size:12px;padding:7px 12px}.site-header .brand img{width:110px}.course-home .hero{padding:26px 22px;grid-template-columns:1fr;gap:26px;margin-top:22px}.course-home .hero h1{font-size:38px}.course-home .hero-copy>p{font-size:15px}.course-home .course-hero-art{max-width:180px}.course-section-nav{gap:5px 18px;padding:18px 0}.course-section-nav a{font-size:12px}.course-section{padding:25px 22px;margin:22px 0;scroll-margin-top:120px}.course-section h2{font-size:26px}.course-section p{font-size:15px}.course-introduction,.course-scope-layout,.course-service{display:block}.home-video-media{padding-top:24px}.home-video-audience{padding:20px}.course-scope{margin-bottom:22px}.home-strands{grid-template-columns:1fr;gap:16px}.home-strands h3{font-size:16px}.course-countdown{padding:24px}.countdown-readout{gap:32px}.course-methods{grid-template-columns:1fr;gap:26px}.course-method p{font-size:15px}.course-method h3{margin-top:10px}.course-entry{display:block;padding:22px}.course-entry .button{margin-top:20px}.course-entry p{font-size:14px}.home-service-illustration{margin:24px 0}.home-service-status{padding:20px}.course-support{grid-template-columns:1fr;gap:24px}.support-brand img{width:82px}.course-support .r1-support-details{flex-direction:column;gap:22px}.course-home details{padding:18px}.course-home summary{font-size:15px}.topics-main{padding-top:30px}.topics-heading h1{font-size:34px}.topics-main .catalog{scroll-margin-top:120px}.filter-tabs button{font-size:12px;padding:10px 14px}.site-reader .reader-tools{top:98px}.reader-sidebar{top:98px;height:calc(100dvh - 98px)}.context-return{top:149px}.reader-content [id]{scroll-margin-top:166px}.has-context .reader-content [id]{scroll-margin-top:269px}.focus-on .reader-tools{top:0}.focus-on .context-return{top:53px}}

.guide-step{scroll-margin-top:120px}
@media(max-width:760px){.focus-on .site-header{display:none}}

/* Revision 05: a legible ticking clock; one page grid and one compact utility bar. */
body{padding-bottom:84px}
.course-home .exam-hero{display:grid;grid-template-columns:minmax(0,1fr) 292px;gap:48px;align-items:center;padding:40px;margin-top:26px}
.exam-hero .hero-copy{min-width:0}
.exam-hero .hero-copy .eyebrow{margin-bottom:12px}
.course-home .exam-hero h1{font-size:42px;line-height:1.22;letter-spacing:-1.5px;margin:0 0 18px;max-width:none}
.exam-hero h1 span{display:inline;margin:0;white-space:nowrap}
.course-home .exam-hero .hero-lead{font-size:15px;line-height:1.85;margin:0 0 24px;max-width:620px}
.course-home .course-hero-art{width:100%;max-width:292px;margin:0;justify-self:center;align-self:center}
.course-home .course-hero-art img{display:block;width:100%;height:auto;max-height:none;object-fit:contain;border-radius:6px}
.exam-face{background:var(--zo-red-5);color:white;border-radius:8px;padding:19px 24px 20px}
.exam-caption{font-size:11px;letter-spacing:.8px;font-weight:600}
.exam-readout{display:grid;grid-template-columns:1.3fr repeat(3,1fr);gap:12px;align-items:center;font-variant-numeric:tabular-nums;margin:12px 0 0}
.exam-unit{text-align:center;min-width:0}
.exam-unit strong{display:block;font-size:58px;font-weight:600;line-height:1.15;letter-spacing:-2px}
.exam-unit span{display:block;font-size:13px;margin-top:4px}
.exam-date{display:flex;gap:8px;align-items:center;background:none;border:0;padding:12px 0 3px;font-size:12px;text-align:left}
.exam-date .icon{width:16px;height:16px}
.exam-reference{display:flex;align-items:center;flex-wrap:wrap;gap:2px 8px;font-size:10px}
.exam-reference>span{color:var(--zo-red-5);font-weight:600}
.exam-reference button{padding:4px 0;background:none;border:0;font-size:10px;color:var(--zo-gray-7);display:inline-flex;align-items:center;gap:2px;min-height:28px}
.exam-reference .icon{width:12px;height:12px}
.exam-paused{font-size:10px;color:var(--zo-red-5)}
.exam-hero .hero-actions{margin-top:20px;gap:12px;flex-wrap:wrap}
.exam-hero .hero-actions .button{font-size:12px;padding:12px 16px;gap:10px}
.course-scope{margin:28px 0}
.course-presence{position:fixed;inset:auto 0 0;z-index:45;background:white;display:flex;align-items:center;justify-content:center;gap:32px;padding:6px 24px calc(6px + env(safe-area-inset-bottom));min-height:68px}
.presence-time{display:flex;align-items:center;gap:12px;border:0;background:none;padding:2px 8px;text-align:left;min-height:48px}
.presence-time>.icon{color:var(--zo-red-5);width:24px;height:24px}
.presence-count{display:block;font-size:12px;line-height:1.45;white-space:nowrap;font-variant-numeric:tabular-nums}
.presence-count strong{font-size:22px;color:var(--zo-red-5);font-weight:600}
.presence-hms{margin-left:10px;color:var(--zo-red-5);font-size:18px;letter-spacing:.5px}
.presence-hms b{font-weight:500}
.presence-time small{display:block;font-size:10px;line-height:1.5;color:var(--zo-gray-7)}
.presence-support{display:flex;align-items:center;gap:5px;font-size:12px;font-weight:600;background:var(--zo-yellow-4);border:0;border-radius:6px;padding:12px 16px;min-height:44px;color:var(--zo-gray-8)}
.presence-support:hover{background:var(--zo-yellow-3)}.presence-support .icon{width:15px;height:15px}
.presence-study-tools,.presence-save{display:none}
.presence-dialog{width:min(480px,calc(100vw - 32px));max-height:calc(100dvh - 40px);border:0;border-radius:12px;background:white;color:var(--zo-gray-8);padding:26px 30px;overscroll-behavior:contain}
.presence-dialog::backdrop{background:rgb(62 58 53 / .55)}
.presence-dialog-head{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:12px;position:sticky;top:-26px;padding-top:8px;background:white;z-index:1}
.presence-dialog-head h2{font-size:23px;letter-spacing:-.6px;margin:0}
.presence-dialog p{font-size:13px;line-height:1.85}.presence-dialog .dialog-qr{display:block;width:256px;height:auto;max-width:100%;padding:28px;margin:0 auto 12px;background:white;box-sizing:border-box}
.presence-bank{display:grid;grid-template-columns:1fr 1fr;gap:12px 22px;margin:10px 0 20px}.presence-bank dt{font-size:10px;color:var(--zo-gray-7);margin:0 0 2px}.presence-bank dd{font-size:14px;margin:0;overflow-wrap:anywhere}
.presence-actions{display:flex;gap:10px;flex-wrap:wrap}.presence-actions .button{font-size:12px;padding-inline:14px}
.presence-copy-status{margin:10px 0 0;color:var(--zo-red-5)}.presence-copy-status:empty{display:none}
.presence-dialog .exam-readout{margin:24px 0;color:var(--zo-red-5)}.presence-dialog .exam-unit strong{font-size:43px}.presence-dialog .exam-unit span{font-size:12px;color:var(--zo-gray-7)}
.exam-auto{display:flex;gap:10px;align-items:center;font-size:13px;margin-top:24px;min-height:44px}.exam-auto input{width:18px;height:18px;accent-color:var(--zo-red-5)}
.presence-dialog .presence-timer-note{font-size:11px;color:var(--zo-gray-7);margin:5px 0 0}
.focus-on .exit-focus{bottom:86px}.toast{bottom:88px}
@media(max-width:1100px){
 .course-home .exam-hero{grid-template-columns:minmax(0,1fr) 240px;gap:30px;padding:30px}.course-home .exam-hero h1{font-size:36px}.exam-unit strong{font-size:48px}.exam-face{padding-inline:18px}
}
@media(max-width:800px){
 .course-home .exam-hero{grid-template-columns:minmax(0,1fr);padding:30px;gap:30px}.course-home .course-hero-art{max-width:260px}.course-home .exam-hero h1{font-size:38px}.exam-unit strong{font-size:54px}
}
@media(max-width:760px){
 .course-home .exam-hero{margin-top:20px}.exam-hero .hero-copy .eyebrow{font-size:10px}.course-home .exam-hero .hero-lead{font-size:14px}.exam-hero .hero-actions .button{font-size:11px;padding:11px 13px;min-height:44px}
 .course-presence{justify-content:space-between;gap:8px;padding:5px 16px calc(5px + env(safe-area-inset-bottom));min-height:65px}.presence-time{gap:8px;padding:2px 0}.presence-time>.icon{width:20px;height:20px}.presence-count{font-size:11px}.presence-count strong{font-size:20px}.presence-hms{font-size:16px;margin-left:6px}.presence-time small{font-size:9px}.presence-support{font-size:11px;padding:10px 12px;gap:3px}
 .presence-study-tools:not(:empty),.presence-save:not(:empty){display:block}.presence-study-tools button,.presence-save button{background:none;border:0;display:flex;align-items:center;justify-content:center;gap:4px;padding:8px 0;font-size:10px;min-height:44px;min-width:32px}.presence-study-tools .icon,.presence-save .icon{width:18px;height:18px}
 .site-reader .presence-time>.icon{display:none}.site-reader .presence-support span{display:none}.site-reader .presence-support{padding-inline:9px}.focus-on .presence-study-tools{display:none}
 .presence-dialog{padding:20px 22px;max-height:calc(100dvh - 24px)}.presence-dialog-head{top:-20px}.presence-dialog-head h2{font-size:21px}.presence-bank{gap:12px 16px}.presence-actions .button{font-size:11px}.presence-dialog .dialog-qr{width:240px;padding:26px}
 .focus-on .exit-focus{bottom:82px}.toast{bottom:84px}
}
@media(max-width:560px){
 .course-home .exam-hero{padding:24px 20px;gap:28px}.course-home .exam-hero h1{font-size:30px;line-height:1.25;letter-spacing:-1px}.course-home .exam-hero .hero-lead{font-size:13px;margin-bottom:20px}
 .exam-face{padding:16px 12px}.exam-caption{font-size:9px;letter-spacing:.3px}.exam-readout{gap:6px;margin-top:12px}.exam-unit strong{font-size:40px;letter-spacing:-1px}.exam-unit span{font-size:11px}.exam-date{font-size:11px}.exam-reference{font-size:9px}.exam-reference button{font-size:9px}
 .exam-hero .hero-actions{gap:8px}.exam-hero .hero-actions .button{flex:1;justify-content:center}.course-home .course-hero-art{max-width:240px}
 .presence-support span{display:none}.presence-dialog{width:calc(100vw - 24px)}.presence-dialog .exam-unit strong{font-size:34px}.presence-dialog .exam-readout{gap:6px}
}
@media(max-width:420px){.site-reader .presence-save{display:none}.course-home .exam-hero h1{font-size:28px}.exam-hero .hero-actions{flex-direction:column;align-items:stretch}.course-presence{padding-inline:12px}}
@media(max-width:360px){.site-header,.site-reader .site-header{padding-inline:16px}.site-header .global-nav{gap:4px}.global-nav a{white-space:nowrap;font-size:11px;padding:7px 9px}.course-home .exam-hero{padding:22px 16px}.exam-unit strong{font-size:34px}.exam-caption{font-size:8px}.presence-time>.icon{display:none}.site-reader .presence-time small{font-size:8px}.site-reader .presence-hms{font-size:14px;margin-left:3px}.site-reader .presence-count strong{font-size:18px}}
@media print{body{padding:0}.course-presence,.presence-dialog{display:none!important}}