:root{--bg:#f7f8f4;--surface:#fff;--soft:#edf1e9;--text:#172b2b;--muted:#596765;--line:#dce2d8;--accent:#1b654e;--accent-dark:#124b3b;--accent-soft:#e1efe7;--code:#18252d;--radius:16px;--shadow:0 14px 45px #153b2610;color-scheme:light}
:root[data-theme=dark]{--bg:#131e22;--surface:#1c2a2f;--soft:#223339;--text:#e7f0e9;--muted:#afc0b8;--line:#35474a;--accent:#96dbc0;--accent-dark:#b6edd8;--accent-soft:#283e36;--code:#0c161c;--shadow:0 14px 45px #0003;color-scheme:dark}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:105px}body{margin:0;background:var(--bg);color:var(--text);font-family:"Segoe UI","Noto Sans KR","Malgun Gothic",system-ui,sans-serif;font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased}body:has(dialog[open]){overflow:hidden}h1,h2,h3,h4,p{margin:0}h1,h2,h3{letter-spacing:-.045em;line-height:1.25;word-break:keep-all;overflow-wrap:anywhere}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit;color:inherit}button,a,input,select,textarea,summary{-webkit-tap-highlight-color:transparent}button,summary{cursor:pointer}button{border:0}a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--accent);outline-offset:4px}a:hover{color:var(--accent)}button:disabled{opacity:.55;cursor:default}img,svg{max-width:100%}[hidden]{display:none!important}::selection{background:var(--accent-soft)}.wrap{width:min(1180px,calc(100% - 64px));margin-inline:auto}.icon{width:21px;height:21px;flex:0 0 auto;vertical-align:middle}.sr-only{position:absolute;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;z-index:99999;top:-70px;left:20px;padding:12px 22px;background:var(--surface);border:2px solid var(--accent)}.skip-link:focus{top:12px}.eyebrow{font:600 11px/1.5 ui-monospace,SFMono-Regular,Consolas,monospace;letter-spacing:.13em;color:var(--accent);text-transform:uppercase}.muted{color:var(--muted)}.text-link{display:inline-flex;align-items:center;gap:12px;min-height:44px;color:var(--accent);font-size:14px;font-weight:650;background:none;padding:0}.text-link:hover{text-decoration:underline;text-underline-offset:5px}.button{min-height:48px;display:inline-flex;align-items:center;justify-content:center;gap:15px;padding:12px 23px;border-radius:9px;font-size:14px;line-height:1.4;font-weight:650;text-align:center;border:1px solid transparent;transition:background .18s,transform .18s}.button:hover{transform:translateY(-1px)}.primary{background:var(--accent);color:var(--surface)}[data-theme=dark] .primary{color:#13271e}.primary:hover{background:var(--accent-dark);color:var(--surface)}[data-theme=dark] .primary:hover{color:#13271e}.secondary{background:transparent;border-color:var(--line);color:var(--text)}.secondary:hover{background:var(--soft)}.button-row{display:flex;gap:12px;flex-wrap:wrap}.pill,.tiny-pill{display:inline-flex;align-items:center;border-radius:6px;background:var(--accent-soft);color:var(--accent);padding:4px 10px;font-size:12px;font-weight:650}.tiny-pill{font:11px/1.5 ui-monospace,Consolas,monospace;letter-spacing:.04em}.status-dot{display:inline-block;width:7px;height:7px;background:var(--accent);border-radius:50%;margin-right:8px}
.site-header{position:sticky;top:0;z-index:90;border-bottom:1px solid var(--line);background:var(--bg)}.header-inner{height:88px;width:min(1376px,calc(100% - 64px));margin:auto;display:flex;align-items:center;justify-content:space-between;gap:28px}.brand{display:flex;align-items:center;gap:12px;font-size:22px;font-weight:550;line-height:1.2;letter-spacing:-.05em;flex-shrink:0}.brand strong{font-weight:750}.brand small{display:block;font:8px/1.6 ui-monospace,Consolas,monospace;letter-spacing:.15em;color:var(--muted);margin-top:6px}.brand-symbol{display:inline-flex;align-items:center;justify-content:center;width:40px;height:43px;background:var(--accent);color:var(--surface);border-radius:9px;font:bold 27px/1 ui-monospace,monospace;letter-spacing:-.13em;padding-right:4px;flex-shrink:0}[data-theme=dark] .brand-symbol{color:#142c22}.brand-symbol span{color:#bfeccc}.desktop-nav{display:flex;gap:30px;align-items:center}.desktop-nav a{display:flex;align-items:center;min-height:48px;font-size:14px;font-weight:550;white-space:nowrap}.desktop-nav a[aria-current]{color:var(--accent);text-decoration:underline;text-underline-offset:11px}.header-tools{display:flex;align-items:center;gap:5px}.icon-button{display:inline-flex;justify-content:center;align-items:center;width:44px;height:44px;background:none;border-radius:8px}.icon-button:hover{background:var(--soft)}.language-switch{display:flex;margin-left:8px;border-left:1px solid var(--line);padding-left:8px}.language-switch a{display:flex;align-items:center;justify-content:center;min-width:32px;min-height:44px;font:11px ui-monospace,monospace;color:var(--muted)}.language-switch a[aria-current]{color:var(--accent);font-weight:800}.mobile-menu-toggle,.mobile-menu{display:none}.mobile-menu{padding:10px 24px 22px;max-height:calc(100dvh - 72px);overflow:auto;border-top:1px solid var(--line)}.mobile-menu a{display:flex;align-items:center;justify-content:space-between;min-height:54px;border-bottom:1px solid var(--line);font-size:16px}.search-dialog,dialog{width:min(620px,calc(100% - 32px));border:1px solid var(--line);border-radius:18px;background:var(--surface);color:var(--text);padding:26px;box-shadow:0 25px 80px #0004}.search-dialog{margin-top:15vh}.search-dialog::backdrop,dialog::backdrop{background:#0f222c88;backdrop-filter:blur(5px)}.dialog-top{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:20px}.dialog-top strong{font-size:20px;letter-spacing:-.035em}.search-dialog .muted{font-size:13px;margin:14px 0}.search-form{display:flex;align-items:center;gap:13px;border:1px solid var(--line);border-radius:10px;padding:7px 8px 7px 16px;background:var(--bg)}.search-form input{background:none;border:0;min-width:0;width:100%;height:42px;outline-offset:0}.search-form button{background:var(--accent);color:var(--surface);font-size:13px;white-space:nowrap;min-height:42px;padding:8px 18px;border-radius:7px}.storage-notice{margin-block:14px;background:var(--accent-soft);border:1px solid var(--line);padding:15px;border-radius:8px;font-size:14px}
.hero{display:grid;grid-template-columns:1.08fr 1fr;gap:100px;align-items:center;padding-top:78px;padding-bottom:78px}.hero h1{font-size:66px;line-height:1.1;letter-spacing:-.065em;margin-top:23px;font-weight:730}.hero h1 span{color:var(--accent)}.hero-description{font-size:17px;line-height:1.9;color:var(--muted);margin:24px 0 30px;word-break:keep-all}.hero-note{font-size:12px;color:var(--muted);margin-top:17px}.path-preview{background:var(--surface);padding:29px 30px 0;border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow);position:relative}.path-preview:before{content:"";position:absolute;inset:-18px 18px 18px -18px;border:1px solid var(--line);border-radius:20px;z-index:-1}.preview-heading{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px;gap:12px}.path-items{position:relative}.path-items:before{content:"";position:absolute;top:24px;bottom:35px;left:20px;width:1px;background:var(--line)}.path-item{display:flex;align-items:center;gap:17px;min-height:76px;position:relative}.path-node{display:flex;justify-content:center;align-items:center;width:40px;height:40px;border-radius:50%;border:1px solid var(--line);background:var(--surface);font:12px ui-monospace,monospace;color:var(--muted);flex-shrink:0}.level-0 .path-node{background:var(--accent);color:var(--surface);border-color:var(--accent)}.path-item-copy{min-width:0;flex:1}.path-item small{display:block;font:10px ui-monospace,monospace;color:var(--muted);letter-spacing:.025em}.path-item strong{display:block;font-size:17px;font-weight:650;margin-top:7px;line-height:1.4;letter-spacing:-.04em}.path-item>.icon{width:17px;color:var(--muted)}.path-item:hover .path-node{border-color:var(--accent)}.preview-bottom{display:flex;align-items:center;gap:20px;border-top:1px solid var(--line);margin-top:12px;padding:21px 0;font:600 13px ui-monospace,monospace}.preview-bottom small{font:11px inherit;color:var(--muted)}.preview-bottom a{margin-left:auto;font:12px/1.5 "Segoe UI","Malgun Gothic",sans-serif;font-weight:650;color:var(--accent)}.section{padding-block:64px}.section-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:30px;margin-bottom:30px}.section-heading h2{font-size:32px;font-weight:650;margin-top:10px;letter-spacing:-.045em}.section-heading>p,.section-description{font-size:14px;color:var(--muted);line-height:1.9}.entry-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.entry-card,.guide-card{padding:28px;border:1px solid var(--line);border-radius:12px;background:var(--surface)}.entry-card:hover{border-color:var(--accent);box-shadow:var(--shadow)}.entry-number{font:12px ui-monospace,monospace;color:var(--accent);display:block;margin-bottom:28px}.entry-card h3,.guide-card h3{font-size:21px;margin-bottom:11px}.entry-card p,.guide-card p{font-size:14px;line-height:1.9;color:var(--muted);word-break:keep-all}.entry-card .text-link{margin-top:20px}.level-section{background:var(--soft)}.level-overview-row{display:grid;grid-template-columns:100px 225px minmax(0,1fr) 104px;gap:20px;align-items:center;min-height:102px;border-top:1px solid var(--line);padding-block:20px}.level-overview-row:last-child{border-bottom:1px solid var(--line)}.level-label{font:11px/1.6 ui-monospace,monospace;letter-spacing:.08em;color:var(--accent)}.level-overview-row h3{font-size:20px}.level-overview-row p{font-size:14px;line-height:1.8;color:var(--muted)}.level-range{display:flex;align-items:center;justify-content:space-between;gap:10px;font:12px ui-monospace,monospace}.topic-chips{display:flex;gap:12px;flex-wrap:wrap}.topic-chips a{display:flex;gap:23px;align-items:center;min-height:49px;padding:10px 20px;border:1px solid var(--line);border-radius:9px;font-size:14px;background:var(--surface)}.topic-chips a:hover{border-color:var(--accent)}.topic-chips span{color:var(--accent)}.closing-note{display:flex;align-items:center;gap:25px;padding-top:64px;margin-top:64px;border-top:1px solid var(--line)}.closing-note>div{flex:1}.closing-note h3{font-size:22px;margin-bottom:10px}.closing-note p{font-size:14px;color:var(--muted);max-width:670px}.closing-note .text-link{white-space:nowrap}.resume-section{margin-block:25px}.resume-card{display:flex;justify-content:space-between;align-items:center;gap:28px;padding:28px 32px;background:var(--accent-soft);border:1px solid var(--line);border-radius:12px}.resume-card h2{font-size:24px;margin-top:9px}.resume-card p[data-resume-title]{font-size:14px;margin-top:8px;color:var(--muted)}
.page-intro{padding:65px 0 35px}.page-intro h1{font-size:44px;font-weight:680;margin:14px 0 19px;letter-spacing:-.055em}.page-intro>p:not(.eyebrow){color:var(--muted);font-size:17px;max-width:770px;line-height:1.9}.catalog-page,.info-page{padding-bottom:90px;min-height:65vh}.prerequisite{background:var(--accent-soft);border-radius:9px;font-size:13px;color:var(--accent);padding:12px 18px;margin-top:25px;width:fit-content}.prerequisite strong{margin-right:8px}.catalog-toolbar{padding:20px;background:var(--surface);border:1px solid var(--line);border-radius:12px}.filter-form{display:flex;gap:10px;align-items:center}.filter-form label{min-width:0}.filter-form .search-field{flex:1;position:relative}.search-field .icon{position:absolute;left:14px;top:14px;color:var(--muted)}.search-field input{width:100%;padding-left:45px!important}.filter-form input,.filter-form select{height:49px;padding:10px 13px;border:1px solid var(--line);border-radius:8px;background:var(--bg);font-size:13px}.filter-form select{max-width:180px}.filter-form .button{white-space:nowrap}.level-tabs{display:flex;gap:8px;margin:25px 0 10px;flex-wrap:wrap}.level-tabs a{min-height:44px;display:flex;align-items:center;padding:9px 19px;border-radius:8px;font-size:13px;font-weight:600;color:var(--muted)}.level-tabs a[aria-current]{color:var(--surface);background:var(--accent)}[data-theme=dark] .level-tabs a[aria-current]{color:#142b22}.level-tabs a:hover:not([aria-current]){background:var(--soft)}.results-heading{display:flex;align-items:center;justify-content:space-between;margin:15px 0 20px;color:var(--muted);font-size:13px}.results-heading strong{color:var(--text)}.module-group{margin-bottom:15px;border:1px solid var(--line);border-radius:12px;overflow:clip;background:var(--surface)}.module-group>summary{display:flex;gap:20px;align-items:center;list-style:none;padding:22px 26px;background:var(--surface)}summary::-webkit-details-marker{display:none}.module-group>summary strong{display:block;font-size:18px;font-weight:650;letter-spacing:-.03em}.module-group>summary small{display:block;font:11px ui-monospace,monospace;color:var(--muted);margin-top:5px}.module-index{font:12px ui-monospace,monospace;color:var(--accent);background:var(--accent-soft);border-radius:9px;padding:12px}.module-count{margin-left:auto;font-size:12px;color:var(--muted);white-space:nowrap}.module-group[open]>summary>.icon{transform:rotate(180deg)}.lesson-list{padding:0;margin:0;list-style:none}.lesson-row{list-style:none;margin:0;padding:0;border-top:1px solid var(--line)}.lesson-row>a{display:flex;gap:19px;align-items:center;padding:21px 26px;min-width:0}.lesson-row>a:hover{background:var(--soft)}.step-number{font:12px/1.8 ui-monospace,monospace;color:var(--muted);width:32px;flex-shrink:0;align-self:flex-start;padding-top:3px}.lesson-row-copy{flex:1;min-width:0}.lesson-row-title{display:block;font-size:17px;font-weight:600;line-height:1.65;letter-spacing:-.03em;word-break:keep-all;overflow-wrap:anywhere}.lesson-row-goal{display:block;font-size:13px;color:var(--muted);margin:7px 0;line-height:1.8}.lesson-meta{display:flex;gap:10px;flex-wrap:wrap;font-size:11px;color:var(--muted);margin-top:7px}.lesson-meta>span+span:before{content:'·';margin-right:10px}.row-arrow .icon{width:17px;color:var(--muted)}.row-state{color:var(--accent)}.lesson-row.is-complete .step-number{color:var(--accent)}.search-results{border:1px solid var(--line);border-radius:12px;overflow:clip;background:var(--surface)}.search-results .lesson-row:first-child{border:0}.empty-state{text-align:center;padding:65px 24px;background:var(--surface);border:1px solid var(--line);border-radius:14px}.empty-state>.icon{width:40px;height:40px;margin-bottom:20px;color:var(--accent)}.empty-state h2{font-size:25px;margin-bottom:14px}.empty-state p{color:var(--muted);margin:12px 0 25px}.empty-state .search-form{max-width:600px;margin:25px auto}.empty-state.page-intro{margin-top:60px}.empty-state.page-intro>p{margin-inline:auto}
.reader-shell{width:min(1440px,calc(100% - 64px));margin:auto;display:grid;grid-template-columns:220px minmax(0,740px) 190px;gap:42px;justify-content:center;align-items:start;padding:37px 0 80px}.panel-sticky{position:sticky;top:118px}.course-panel,.toc-panel{height:100%;min-width:0}.course-panel{font-size:13px}.back-link{display:inline-flex;align-items:center;min-height:44px;font-size:12px;color:var(--muted);margin-bottom:22px}.course-panel h2{font-size:20px;margin:10px 0 15px;line-height:1.5}.side-progress{padding:13px 0;font-size:11px;color:var(--muted)}progress{display:block;appearance:none;width:100%;height:4px;border:0;border-radius:4px;background:var(--line);margin-top:9px;overflow:hidden}progress::-webkit-progress-bar{background:var(--line)}progress::-webkit-progress-value{background:var(--accent)}progress::-moz-progress-bar{background:var(--accent)}.completion-checkbox{display:flex;align-items:center;gap:10px;min-height:44px;padding:8px 12px;margin:3px 0 14px;background:var(--accent-soft);border-radius:7px;cursor:pointer;font-size:12px;font-weight:600}.completion-checkbox input{width:17px;height:17px;accent-color:var(--accent)}.course-list{max-height:calc(100vh - 430px);min-height:190px;overflow-y:auto;overscroll-behavior:contain;padding-right:6px;margin-bottom:15px;scrollbar-width:thin;scrollbar-color:var(--line) transparent}.course-list details>summary{padding:13px 2px;list-style:none;font-size:12px;font-weight:650;color:var(--muted);border-top:1px solid var(--line);line-height:1.7}.course-list summary:before{content:'+';display:inline-block;width:16px;color:var(--accent)}.course-list details[open]>summary:before{content:'−'}.course-list ul{list-style:none;padding:0;margin:0 0 13px}.compact{border:0}.compact>a{padding:9px 6px;gap:8px;border-radius:6px;min-height:44px;align-items:flex-start}.compact .step-number{width:26px;font-size:10px;padding-top:1px}.compact .lesson-row-title{font-size:11px;line-height:1.75;font-weight:450;word-break:normal;overflow-wrap:anywhere}.compact .row-arrow{display:none}.compact .row-state .icon{width:12px;height:12px}.compact a[aria-current]{background:var(--accent-soft);color:var(--accent);font-weight:650}.course-panel small.muted{font-size:10px}.breadcrumbs{display:flex;gap:10px;flex-wrap:wrap;font-size:12px;color:var(--muted);align-items:center;min-height:44px;margin-bottom:27px}.breadcrumbs a{display:inline-flex;align-items:center;min-height:36px}.breadcrumbs>span:last-child{color:var(--accent)}.lesson-article{min-width:0}.lesson-heading h1{font-size:36px;line-height:1.4;font-weight:680;letter-spacing:-.045em;margin:12px 0 23px;word-break:keep-all;overflow-wrap:anywhere}.lesson-heading-meta{display:flex;align-items:center;gap:12px;flex-wrap:wrap;padding-bottom:27px;border-bottom:1px solid var(--line);font-size:11px;color:var(--muted);margin-bottom:32px}.bookmark-button{margin-left:auto;display:flex;align-items:center;gap:7px;min-height:44px;padding:5px 10px;background:none;border:1px solid var(--line);border-radius:7px;font-size:12px}.bookmark-button .icon{width:15px}.bookmark-button[aria-pressed=true]{color:var(--accent);background:var(--accent-soft);border-color:var(--accent)}.lesson-content{font-size:17px;line-height:1.95;overflow-wrap:anywhere;word-break:normal}.lesson-content>:first-child{margin-top:0}.lesson-content p{margin:19px 0}.lesson-content h2{font-size:26px;line-height:1.5;font-weight:650;margin:48px 0 22px;padding-top:4px;letter-spacing:-.045em;scroll-margin-top:115px}.lesson-content h3{font-size:21px;line-height:1.5;margin:32px 0 15px;scroll-margin-top:115px}.lesson-content h4{font-size:18px;margin:25px 0 12px}.lesson-content ul,.lesson-content ol{padding-left:25px;margin:22px 0}.lesson-content li{margin:9px 0}.lesson-content li p{margin:5px 0}.lesson-content a{color:var(--accent);text-decoration:underline;text-underline-offset:3px;overflow-wrap:anywhere}.lesson-content blockquote{margin:25px 0;padding:15px 22px;border-left:3px solid var(--accent);background:var(--soft);border-radius:0 8px 8px 0;font-size:15px;line-height:1.9}.lesson-content blockquote p{margin:8px 0}.lesson-content hr{border:0;border-top:1px solid var(--line);margin:36px 0}.lesson-content strong{font-weight:650}.lesson-content code{font: .84em/1.7 ui-monospace,SFMono-Regular,Consolas,monospace;background:var(--soft);color:var(--accent);padding:3px 5px;border-radius:4px;overflow-wrap:anywhere}.lesson-content pre{max-width:100%;overflow-x:auto;overscroll-behavior-x:contain;background:var(--code);color:#deece6;border:1px solid #304148;border-radius:10px;padding:24px 20px 23px;margin:24px 0;white-space:pre;tab-size:4;font:13px/1.8 ui-monospace,Consolas,monospace;position:relative;scrollbar-width:thin}.lesson-content pre code{font:inherit;padding:0;background:none;color:inherit;white-space:pre;overflow-wrap:normal;word-break:normal}.code-frame{position:relative;margin:24px 0}.code-frame pre{margin:0;padding-top:54px}.copy-button{position:absolute;top:9px;right:9px;min-height:34px;padding:7px 12px;z-index:2;font:11px ui-monospace,monospace;border:1px solid #52615e;color:#e1eee7;background:#2c3d40;border-radius:6px}.copy-button:hover{background:#3d5355}.table-scroll{max-width:100%;overflow-x:auto;margin:25px 0;border:1px solid var(--line);border-radius:9px;scrollbar-width:thin}.lesson-content table{border-collapse:collapse;margin:0;width:100%;min-width:400px;font-size:14px;line-height:1.85}.lesson-content td,.lesson-content th{border:0;border-bottom:1px solid var(--line);padding:12px 15px;text-align:left;vertical-align:top}.lesson-content th{background:var(--soft);font-weight:650}.lesson-content tr:last-child td{border-bottom:0}.lesson-content td code{word-break:normal;white-space:normal}.answer-section{border:1px solid var(--line);padding:0 24px 10px;background:var(--surface);border-radius:10px;margin:30px 0}.answer-section>summary{list-style:none;font-size:13px;color:var(--accent);font-weight:650;margin:0 -24px;padding:17px 24px;border-bottom:1px solid var(--line)}.answer-section>summary:after{content:' +';float:right}.answer-section[open]>summary:after{content:' −'}.answer-section>h2:first-of-type{margin-top:23px}.toc-panel{padding-top:14px}.toc-panel .panel-sticky{border-left:1px solid var(--line);padding-left:20px}.toc-panel nav{display:flex;flex-direction:column;max-height:calc(100vh - 240px);overflow-y:auto;scrollbar-width:thin;margin-top:18px}.toc-panel nav a{display:block;color:var(--muted);font-size:11px;line-height:1.8;padding:7px 0}.toc-panel nav a:hover,.toc-panel nav a.active{color:var(--accent);font-weight:600}.toc-panel .toc-h3{padding-left:11px;font-size:10px}.toc-top{display:inline-flex;align-items:center;min-height:44px;margin-top:14px;font-size:11px;color:var(--muted)}.lesson-completion{display:flex;gap:20px;align-items:center;justify-content:space-between;background:var(--accent-soft);border-radius:12px;padding:27px;margin-top:45px}.lesson-completion h2{font-size:24px;margin:8px 0}.lesson-completion p:not(.eyebrow){font-size:13px;color:var(--muted)}.lesson-completion .button{white-space:nowrap}.lesson-pagination{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:25px}.lesson-pagination a{padding:21px 0;border-top:1px solid var(--line);display:flex;flex-direction:column;gap:10px}.lesson-pagination a:last-child{text-align:right}.lesson-pagination small{color:var(--accent);font-size:12px}.lesson-pagination strong{font-size:14px;font-weight:550;line-height:1.8;word-break:keep-all}.report-link{display:inline-block;font-size:11px;color:var(--muted);margin-top:30px;text-decoration:underline;text-underline-offset:3px}.resume-position{background:var(--accent-soft);border-radius:8px;padding:12px 16px;font-size:12px;display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:24px}.reading-meter{position:fixed;top:87px;left:0;right:0;height:2px;z-index:95;pointer-events:none}.reading-meter span{display:block;height:100%;width:0;background:var(--accent)}.reader-mobile-tools,.reader-bottom{display:none}
.start-feature{display:grid;grid-template-columns:1fr 1fr;gap:70px;align-items:center;background:var(--soft);border:1px solid var(--line);border-radius:16px;padding:42px}.start-feature h2{font-size:36px;line-height:1.35;margin:18px 0}.start-feature p{font-size:15px;color:var(--muted);line-height:1.9;margin-bottom:25px}.terminal-preview{min-width:0;background:var(--code);color:#e2eee7;border-radius:11px;overflow:hidden;box-shadow:0 18px 35px #0002}.terminal-preview>div{display:flex;gap:7px;border-bottom:1px solid #ffffff20;padding:14px 16px;align-items:center}.terminal-preview>div>span{width:7px;height:7px;background:#65817b;border-radius:50%}.terminal-preview>div>span:first-child{background:#be7f71}.terminal-preview>div>span:nth-child(2){background:#bdad77}.terminal-preview small{font:10px ui-monospace,monospace;color:#c1cfc9;margin-left:auto}.terminal-preview pre{padding:25px;font:12px/2 ui-monospace,monospace;margin:0;overflow-x:auto}.terminal-preview pre>span{color:#92bdac}.terminal-preview p{font-size:11px;margin:0;padding:0 25px 22px;color:#afc2b8}.cursor-block{color:#92cfae}.starting-levels{margin-top:25px}.starting-levels>a{display:flex;align-items:center;gap:32px;padding:23px 0;border-top:1px solid var(--line)}.starting-levels>a:last-child{border-bottom:1px solid var(--line)}.starting-levels>a>div{flex:1}.starting-levels h3{font-size:20px;margin-bottom:7px}.starting-levels p{font-size:13px;color:var(--muted)}.practice-note{padding:27px 30px;background:var(--surface);border:1px solid var(--line);border-left:3px solid var(--accent);border-radius:10px}.practice-note h2{font-size:22px;margin-bottom:16px}.practice-note p{font-size:14px;color:var(--muted);line-height:1.9;max-width:900px}.practice-note .text-link{margin-top:10px}.topics-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.topic-card{display:flex;flex-direction:column;padding:28px;border:1px solid var(--line);border-radius:12px;background:var(--surface)}.topic-card:hover{border-color:var(--accent)}.topic-glyph{width:43px;height:43px;display:flex;align-items:center;justify-content:center;border-radius:9px;background:var(--accent-soft);color:var(--accent);margin-bottom:23px}.topic-card small{font:11px ui-monospace,monospace;color:var(--muted)}.topic-card h2{font-size:23px;margin:12px 0}.topic-card p{font-size:13px;color:var(--muted);line-height:1.8;margin-bottom:20px}.topic-card .text-link{margin-top:auto}.local-note{display:flex;align-items:center;gap:18px;background:var(--soft);border-radius:9px;padding:17px 22px;color:var(--muted);font-size:13px}.learning-summary{display:grid;grid-template-columns:repeat(3,1fr);border:1px solid var(--line);border-radius:12px;margin:25px 0;background:var(--surface);overflow:hidden}.learning-summary>div{padding:25px 30px;display:flex;align-items:baseline;gap:20px;border-right:1px solid var(--line)}.learning-summary>div:last-child{border:0}.learning-summary strong{font:500 36px/1.3 ui-monospace,monospace;color:var(--accent)}.learning-summary span{font-size:13px;color:var(--muted)}.learning-tabs{display:flex;gap:10px;margin:30px 0 20px;border-bottom:1px solid var(--line)}.learning-tabs button{padding:15px 20px;background:none;border-bottom:2px solid transparent;font-size:14px;color:var(--muted)}.learning-tabs button.active{color:var(--accent);border-color:var(--accent);font-weight:650}.learning-settings{margin-top:45px;border-top:1px solid var(--line);padding-top:18px}.learning-settings .text-link{font-size:12px;color:var(--muted)}.learning-settings p{font-size:11px}.learning-list{list-style:none;padding:0;margin:0;border:1px solid var(--line);border-radius:10px;background:var(--surface)}.learning-list li+li{border-top:1px solid var(--line)}.learning-list a{display:flex;justify-content:space-between;align-items:center;gap:20px;min-height:70px;padding:18px 24px;font-size:15px;font-weight:550}.learning-list a:hover{background:var(--soft)}#reset-dialog h2{font-size:25px;margin-bottom:18px}#reset-dialog p{color:var(--muted);font-size:14px;margin-bottom:25px}.about-layout{display:grid;grid-template-columns:1fr 300px;gap:100px;align-items:start;padding-top:15px}.prose{font-size:17px;line-height:1.95;max-width:740px}.prose h2{font-size:24px;margin:32px 0 15px}.prose h2:first-child{margin-top:0}.prose p{color:var(--muted);margin-bottom:25px}.about-note{padding:30px;background:var(--accent-soft);border:1px solid var(--line);border-radius:13px}.about-note>strong{display:block;font:500 70px/1.1 ui-monospace,monospace;letter-spacing:-.05em;color:var(--accent);margin-top:30px}.about-note>span{font-size:14px;color:var(--muted)}.about-note>div{padding:20px 0;border-bottom:1px solid var(--line);font-size:12px}.about-note .text-link{margin-top:15px;font-size:13px}.feedback-section{display:grid;grid-template-columns:1fr 1.3fr;gap:80px;border-top:1px solid var(--line);margin-top:65px;padding-top:55px;scroll-margin-top:110px}.feedback-section h2{font-size:30px;margin:13px 0 20px}.feedback-section p{font-size:14px;color:var(--muted);line-height:1.9}.feedback-form{display:flex;flex-direction:column;gap:20px}.feedback-form label{display:block;font-size:13px;font-weight:600}.feedback-form input:not([type=hidden]),.feedback-form textarea{display:block;width:100%;padding:12px 15px;background:var(--surface);border:1px solid var(--line);border-radius:8px;margin-top:7px;font-size:14px;font-weight:400}.feedback-form textarea{resize:vertical;min-height:130px}.feedback-form .button{align-self:flex-start}.honeypot{position:absolute;left:-9999px;width:1px;height:1px;overflow:hidden}.form-message{padding:16px;background:var(--accent-soft);border-radius:8px;margin-bottom:25px}
.site-footer{border-top:1px solid var(--line);background:var(--surface);padding-top:44px}.footer-inner{display:flex;justify-content:space-between;gap:35px;align-items:center;padding-bottom:37px}.footer-brand{font-size:22px;font-weight:650;letter-spacing:-.045em}.footer-brand span{margin-left:15px;font-weight:400;color:var(--accent)}.footer-inner p{font-size:12px;color:var(--muted);margin-top:10px}.footer-inner nav{display:flex;gap:24px}.footer-inner nav a{font-size:12px;display:flex;align-items:center;min-height:44px;color:var(--muted)}.footer-bottom{display:flex;justify-content:space-between;border-top:1px solid var(--line);padding-block:20px;color:var(--muted);font-size:10px}.admin-bar .site-header{top:32px}.admin-bar .panel-sticky{top:150px}.admin-bar .reading-meter{top:119px}
@media(min-width:1280px){.reader-mobile-tools{display:none!important}}
@media(max-width:1279px){.desktop-nav{gap:18px}.header-inner{gap:18px}.brand{font-size:20px}.hero{gap:55px}.hero h1{font-size:59px}.reader-shell{grid-template-columns:210px minmax(0,740px);gap:30px}.toc-panel{display:none}.reader-mobile-tools{display:flex;grid-column:1/-1;justify-content:flex-end;margin-bottom:-8px}.reader-mobile-tools [data-panel=course-panel]{display:none}.toc-panel.is-open{display:block;grid-column:1/-1;grid-row:2;border:1px solid var(--line);border-radius:10px;background:var(--surface);padding:20px}.toc-panel.is-open .panel-sticky{position:static;border:0;padding:0}.toc-panel.is-open nav{max-height:38vh;display:grid;grid-template-columns:1fr 1fr;column-gap:24px}.toc-panel.is-open nav a{font-size:13px}.toc-panel.is-open .toc-h3{display:none}.level-overview-row{grid-template-columns:80px 200px minmax(0,1fr) 95px}.filter-form{flex-wrap:wrap}.filter-form .search-field{min-width:240px}.filter-form select{max-width:170px}.about-layout{gap:60px}.feedback-section{gap:60px}}
@media(max-width:1060px){.desktop-nav{display:none}.mobile-menu-toggle,.mobile-menu{display:flex}.mobile-menu{flex-direction:column}.hero{gap:35px}.hero h1{font-size:54px}.path-preview{padding:24px 24px 0}.path-item strong{font-size:16px}.entry-card,.guide-card{padding:24px}.level-overview-row{grid-template-columns:75px 190px minmax(0,1fr) 86px;gap:15px}.level-overview-row h3{font-size:18px}.start-feature{gap:30px;padding:32px}.learning-summary>div{flex-direction:column;gap:7px}.filter-form .search-field{flex-basis:100%}}
@media(max-width:767px){html{scroll-padding-top:86px}.wrap,.reader-shell{width:calc(100% - 40px)}.header-inner{width:calc(100% - 32px);height:72px;gap:5px}.brand{font-size:18px;gap:8px}.brand-symbol{width:32px;height:36px;font-size:24px;border-radius:7px}.brand small{font-size:6px;letter-spacing:.13em;margin-top:4px}.header-tools{gap:0}.header-tools .icon-button{width:36px;min-width:36px;height:44px}.header-tools .icon{width:19px;height:19px}.language-switch{gap:0;margin-left:2px;padding-left:3px}.language-switch a{min-width:28px;font-size:10px}.mobile-menu{padding-inline:20px}.hero{display:flex;flex-direction:column;gap:42px;padding-top:45px;padding-bottom:42px;align-items:stretch}.hero h1{font-size:49px;margin-top:20px;letter-spacing:-.06em}.hero-description{font-size:15px;line-height:1.9;margin:22px 0 25px}.hero .button-row{gap:9px}.hero .button{font-size:13px;padding:13px 15px;flex:1;gap:8px}.hero-note{font-size:11px;margin-top:14px}.path-preview{padding:20px 22px 0;border-radius:13px}.path-preview:before{display:none}.preview-heading{margin-bottom:12px}.eyebrow{font-size:10px}.path-item{min-height:64px;gap:14px}.path-node{width:34px;height:34px;font-size:11px}.path-items:before{left:17px}.path-item strong{font-size:15px;margin-top:5px}.path-item small{font-size:9px}.preview-bottom{font-size:11px;gap:14px;padding:18px 0}.preview-bottom a{font-size:11px}.section{padding-block:40px}.section-heading{align-items:flex-start;gap:14px;flex-direction:column;margin-bottom:24px}.section-heading h2{font-size:28px}.section-heading>p{font-size:13px}.entry-grid{grid-template-columns:1fr;gap:12px}.entry-card{padding:22px 23px;position:relative}.entry-number{margin-bottom:18px}.entry-card h3{font-size:20px}.entry-card p{font-size:13px;max-width:85%}.entry-card .text-link{margin-top:12px;font-size:13px}.entry-card>.entry-number{position:absolute;right:23px;top:24px}.level-overview-row{grid-template-columns:70px 1fr 72px;gap:12px;padding-block:21px;min-height:110px}.level-overview-row h3{font-size:17px}.level-overview-row p{grid-column:2/-1;grid-row:2;font-size:12px}.level-range{grid-column:3;grid-row:1;font-size:10px;gap:7px}.level-range .icon{width:16px}.level-label{font-size:10px}.topic-chips{gap:9px}.topic-chips a{font-size:12px;padding:9px 15px;gap:14px;min-height:44px}.closing-note{padding-top:35px;margin-top:40px;gap:15px;flex-wrap:wrap}.closing-note h3{font-size:19px}.closing-note p{font-size:12px}.closing-note>div{flex-basis:calc(100% - 60px)}.closing-note>.text-link{margin-left:47px;font-size:12px}.page-intro{padding:42px 0 29px}.page-intro h1{font-size:34px;margin:13px 0 16px}.page-intro>p:not(.eyebrow){font-size:15px;line-height:1.85}.catalog-page,.info-page{padding-bottom:55px}.prerequisite{font-size:12px;line-height:1.8;padding:14px;margin-top:20px}.catalog-toolbar{padding:13px}.filter-form{gap:8px}.filter-form .search-field{min-width:0;flex-basis:100%}.filter-form>label:not(.search-field){flex:1;min-width:calc(50% - 8px)}.filter-form select{width:100%;max-width:none;font-size:12px}.filter-form .button{flex:1;font-size:12px}.level-tabs{gap:2px;margin-top:18px}.level-tabs a{font-size:11px;padding:9px 10px}.results-heading{font-size:12px;gap:12px;align-items:flex-start}.results-heading .text-link{font-size:11px;white-space:nowrap;min-height:28px}.module-group>summary{padding:18px 16px;gap:12px}.module-group>summary strong{font-size:16px;line-height:1.5}.module-group>summary small{font-size:10px}.module-count{font-size:10px}.module-group>summary>.icon{width:16px}.module-index{font-size:10px;padding:9px}.lesson-row>a{gap:10px;padding:18px 15px}.step-number{width:25px;font-size:10px}.lesson-row-title{font-size:15px;line-height:1.65}.lesson-row-goal{font-size:12px;line-height:1.75;margin:5px 0}.lesson-meta{font-size:10px;gap:7px}.lesson-meta>span+span:before{margin-right:7px}.row-arrow .icon{width:14px}.empty-state{padding:36px 18px}.empty-state h2{font-size:22px}.empty-state p{font-size:13px}.reader-shell{display:flex;flex-direction:column;gap:0;padding-top:18px;padding-bottom:40px}.reader-mobile-tools{display:flex;width:100%;gap:10px;justify-content:stretch;margin:0 0 22px}.reader-mobile-tools .button{flex:1;font-size:12px;gap:8px;padding:10px 8px;min-height:44px}.reader-mobile-tools [data-panel=course-panel]{display:flex}.course-panel,.toc-panel{display:none;width:100%;height:auto}.course-panel.is-open,.toc-panel.is-open{display:block;position:relative;margin:0 0 22px;padding:18px;background:var(--surface);border:1px solid var(--line);border-radius:10px}.panel-sticky{position:static!important}.course-panel.is-open .back-link{margin:0 0 10px}.course-panel .course-list{max-height:45vh}.course-list .compact .lesson-row-title{font-size:13px}.course-list summary{font-size:13px}.toc-panel.is-open nav{display:block;max-height:43vh}.toc-panel.is-open .toc-h3{display:block;font-size:12px}.toc-panel.is-open .panel-sticky{border:0;padding:0}.lesson-article{width:100%}.breadcrumbs{font-size:11px;margin-bottom:18px;gap:8px}.lesson-heading h1{font-size:28px;line-height:1.5;margin:10px 0 18px}.lesson-heading-meta{font-size:10px;gap:8px;margin-bottom:24px;padding-bottom:19px}.bookmark-button{font-size:11px;padding:5px 8px;margin-left:0}.lesson-content{font-size:17px;line-height:1.9}.lesson-content h2{font-size:24px;margin-top:38px}.lesson-content h3{font-size:20px;margin-top:28px}.lesson-content blockquote{font-size:14px;padding:13px 16px}.lesson-content ul,.lesson-content ol{padding-left:22px}.lesson-content pre{font-size:12px;padding:20px 16px}.code-frame pre{padding-top:54px}.copy-button{min-height:36px;padding:8px 12px}.lesson-content table{font-size:13px;min-width:420px}.lesson-content td,.lesson-content th{padding:10px 12px}.answer-section{padding:0 16px 10px}.answer-section>summary{margin-inline:-16px;padding:15px 16px;font-size:12px}.lesson-completion{padding:23px;align-items:stretch;flex-direction:column;gap:18px}.lesson-completion h2{font-size:23px}.lesson-completion .button{width:100%}.lesson-pagination{gap:17px}.lesson-pagination strong{font-size:12px;line-height:1.8}.lesson-pagination small{font-size:11px}.report-link{font-size:11px;line-height:1.8}.reading-meter{top:71px}.reader-bottom{display:grid;grid-template-columns:1fr 1.25fr 1fr;position:fixed;left:0;right:0;bottom:0;z-index:92;background:var(--surface);border-top:1px solid var(--line);box-shadow:0 -3px 15px #0001;padding:5px 10px max(5px,env(safe-area-inset-bottom))}.reader-bottom>button,.reader-bottom>a{display:flex;align-items:center;justify-content:center;gap:6px;min-height:45px;padding:8px 5px;border-radius:7px;font-size:11px;font-weight:600;background:none}.reader-bottom .icon{width:16px;height:16px}.reader-bottom>[data-complete]{color:var(--accent);background:var(--accent-soft)}.view-lesson .site-footer{padding-bottom:65px}.resume-position{font-size:11px;align-items:flex-start;flex-direction:column;gap:0}.resume-position .text-link{font-size:12px}.start-feature{grid-template-columns:1fr;gap:28px;padding:25px}.start-feature h2{font-size:30px}.start-feature p{font-size:14px}.terminal-preview pre{padding:20px;font-size:11px}.terminal-preview p{font-size:10px;padding:0 20px 18px}.guide-card{padding:23px}.guide-card h3{font-size:20px}.starting-levels>a{gap:18px}.starting-levels h3{font-size:18px}.starting-levels p{font-size:12px}.practice-note{padding:22px}.practice-note h2{font-size:21px}.practice-note p{font-size:13px}.topics-grid{grid-template-columns:1fr 1fr;gap:12px}.topic-card{padding:20px 16px}.topic-glyph{width:37px;height:37px;margin-bottom:18px}.topic-card h2{font-size:20px;margin:10px 0}.topic-card small{font-size:10px}.topic-card p{font-size:12px}.topic-card .text-link{font-size:11px;gap:7px}.topic-card .text-link .icon{width:16px}.local-note{padding:16px;gap:12px;font-size:12px}.learning-summary>div{padding:18px 13px;gap:10px}.learning-summary strong{font-size:28px}.learning-summary span{font-size:10px}.resume-card{padding:23px;align-items:stretch;flex-direction:column;gap:20px}.resume-card h2{font-size:22px;line-height:1.6}.resume-card .button{font-size:13px}.learning-tabs button{font-size:13px;padding:12px 15px}.learning-list a{font-size:13px;padding:16px}.learning-list .icon{width:17px}.about-layout{grid-template-columns:1fr;gap:25px}.prose{font-size:15px}.prose h2{font-size:23px}.about-note{padding:25px}.about-note>strong{font-size:54px}.feedback-section{grid-template-columns:1fr;gap:27px;margin-top:40px;padding-top:35px}.feedback-section h2{font-size:28px}.feedback-section p{font-size:13px}.feedback-form .button{width:100%}.site-footer{padding-top:30px}.footer-inner{flex-direction:column;align-items:flex-start;gap:20px;padding-bottom:22px}.footer-brand{font-size:21px}.footer-inner p{font-size:11px}.footer-inner nav{gap:23px;flex-wrap:wrap}.footer-inner nav a{font-size:11px}.footer-bottom{font-size:9px}.desktop-only{display:none}.admin-bar .site-header{top:46px}.admin-bar .reading-meter{top:117px}}
@media(max-width:380px){.header-inner{width:calc(100% - 24px)}.brand{font-size:16px;gap:6px}.brand-symbol{width:29px;height:33px;font-size:22px}.header-tools .icon-button{width:33px;min-width:33px}.language-switch a{min-width:25px}.hero h1{font-size:45px}.hero .button{padding-inline:10px;font-size:12px}.hero .button>.icon{width:17px}.preview-bottom{gap:10px}.preview-bottom a{font-size:10px}.topics-grid{grid-template-columns:1fr}.topic-card{padding:24px}.topic-card p{font-size:13px}.module-count{display:none}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}
@media print{.site-header,.site-footer,.course-panel,.toc-panel,.reader-mobile-tools,.reader-bottom,.reading-meter,.copy-button,.bookmark-button,.lesson-completion,.report-link,.resume-position{display:none!important}body{background:#fff;color:#000}.reader-shell{display:block;width:100%;padding:0}.lesson-article{max-width:none}.lesson-content{font-size:11pt;line-height:1.65}.lesson-content pre{white-space:pre-wrap;background:#f3f3f3!important;color:#111!important;border:1px solid #bbb}.lesson-content pre code{white-space:pre-wrap}.table-scroll{overflow:visible}.lesson-content table{min-width:0}.answer-section{display:block}.answer-section>*{display:block!important}.lesson-heading h1{font-size:24pt}.lesson-content h2{break-after:avoid}.lesson-content a{color:#000}.lesson-pagination{display:none}}
.mobile-language{display:flex;align-items:center;gap:15px;padding-top:16px;font-size:12px}.mobile-language>span{color:var(--muted);margin-right:auto}.mobile-menu .mobile-language a{border:1px solid var(--line);border-radius:7px;padding:7px 15px;min-height:44px;font-size:13px}.mobile-language a[aria-current]{background:var(--accent-soft);color:var(--accent)}@media(max-width:767px){.header-tools>.language-switch{display:none}.header-tools .icon-button{width:44px;min-width:44px}.header-inner{gap:12px}.brand{font-size:18px}.brand-symbol{width:32px;height:36px}}