:root{--ink:#20362c;--muted:#69746b;--green:#286c4d;--green-dark:#1e523b;--paper:#fbfcf8;--line:#e0e5db;--soft:#f0f3eb;--mono:ui-monospace,SFMono-Regular,Consolas,monospace}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;background:var(--paper);color:var(--ink);font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;font-size:15px;line-height:1.65}a{color:inherit;text-decoration:none}button,input{font:inherit}button,a,input{-webkit-tap-highlight-color:transparent}button{cursor:pointer}a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid #719d63;outline-offset:5px}button{color:inherit}img{max-width:100%}h1,h2,h3,p{margin:0}h1,h2,h3{line-height:1.35}::selection{background:#d7e9ad}.container{width:min(1180px,calc(100% - 80px));margin-inline:auto}.header{height:90px;border-bottom:1px solid 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#173d2c15}.primary:hover{background:var(--green-dark)}.text-link{font-size:13px;font-weight:550}.hero-note{display:flex;gap:21px;margin-top:25px;font-size:11px;color:var(--muted)}.hero-visual{position:relative;padding-bottom:22px}.code-window{background:#1e3028;border:1px solid #233e30;border-radius:13px;box-shadow:18px 22px 0 #edf0e5;overflow:hidden;transform:rotate(1deg)}.window-bar{display:flex;justify-content:space-between;align-items:center;padding:15px 20px;border-bottom:1px solid #ffffff15;color:#9cab9f;font:10px var(--mono)}.dots{letter-spacing:3px;font-size:10px;color:#718f70}.code-lines{padding:27px 16px;color:#f4f4dd;font:12px/2 var(--mono);overflow:auto}.code-lines i{font-style:normal;display:inline-block;width:30px;color:#5e7c6b;text-align:center;margin-right:10px}.syn-comment{color:#8d9a8b}.syn-tag{color:#badd8a}.cursor{color:#dfbc75}.preview{background:#f4f5e9;margin:0 20px 20px;border-radius:6px;padding:22px 25px}.preview-label{font:9px 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solid #dae1cd;padding:37px 0}.search-inner{display:flex;justify-content:space-between;align-items:center;gap:35px}.search-inner h2{font-size:24px;font-weight:600;margin-top:8px}.search-inner .eyebrow{font-size:9px}.search-inner form{display:flex;background:#fbfcf6;border:1px solid #cbd7bd;border-radius:7px;padding:5px;max-width:500px;width:50%}.search-inner input{background:transparent;border:0;padding:8px 12px;min-width:0;flex:1;font-size:13px;color:var(--ink)}.search-inner button{background:var(--green);color:white;border:0;border-radius:4px;padding:10px 18px;font-size:12px;white-space:nowrap}.footer{display:flex;justify-content:space-between;align-items:center;padding-block:38px}.footer .brand{font-size:20px}.footer p{font-size:11px;margin-top:7px;color:var(--muted)}.footer-links{display:flex;gap:25px;font-size:11px;color:var(--muted)}.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{position:absolute;top:-100px;left:10px;padding:12px;background:var(--green);color:#fff;z-index:100}.skip:focus{top:10px}.breadcrumb{font-size:12px;display:flex;flex-wrap:wrap;gap:12px;color:var(--muted);margin-bottom:29px}.listing-heading{margin-bottom:32px}.listing-heading h1{font-size:40px;letter-spacing:-1px;margin:14px 0}.listing-heading p{color:var(--muted)}.category-tabs{display:flex;gap:10px;flex-wrap:wrap;border-bottom:1px solid var(--line);padding-bottom:24px}.category-tabs a{font-size:12px;border:1px solid var(--line);border-radius:6px;padding:7px 14px;background:#fff}.category-tabs a[aria-current]{color:white;background:var(--green);border-color:var(--green)}.lesson-row{display:flex;align-items:center;gap:24px;padding:28px 6px;border-bottom:1px solid var(--line)}.lesson-row:hover{background:#f1f5ea}.lesson-icon{width:40px;height:40px;display:grid;place-items:center;background:#edf2e6;color:var(--green);border-radius:8px;flex-shrink:0}.lesson-row h2{font-size:20px;margin-bottom:7px;font-weight:600}.lesson-row p{font-size:13px;line-height:1.8;color:var(--muted)}.read-label{margin-left:auto;white-space:nowrap;font-size:12px;color:var(--green)}.pagination{margin-top:30px;display:flex;gap:10px}.pagination a,.pagination span{padding:5px 11px;border-radius:4px;border:1px solid var(--line)}.article-layout{display:grid;grid-template-columns:210px minmax(0,1fr) 155px;gap:40px;padding-block:46px 70px}.lesson-sidebar,.toc{align-self:start;position:sticky;top:25px;font-size:12px}.back-link{display:block;color:var(--green);margin-bottom:30px}.lesson-sidebar h2,.toc h2{font-size:12px;font-weight:600;margin-bottom:15px}.lesson-sidebar nav{display:flex;flex-direction:column;gap:6px}.lesson-sidebar nav a{padding:9px 11px;border-radius:6px;color:var(--muted);line-height:1.65}.lesson-sidebar nav a[aria-current]{background:#e9efde;color:var(--green);font-weight:600}.sidebar-note{border-top:1px solid var(--line);margin-top:28px;padding-top:18px;color:#8a9483;font-size:11px;line-height:1.9}.article{min-width:0}.article .breadcrumb{margin-bottom:34px}.article h1{font-size:34px;line-height:1.45;letter-spacing:-.8px;margin-top:12px}.article-lead{font-size:15px;line-height:1.9;color:var(--muted);margin-top:18px}.article-meta{display:flex;align-items:center;gap:10px;font-size:11px;color:#7b8876;border-bottom:1px solid var(--line);padding-block:20px 24px}.print-button{margin-left:auto;background:none;border:0;color:var(--green);font-size:11px}.article-body{font-size:15px;line-height:1.95;overflow-wrap:anywhere}.article-body h2{font-size:23px;font-weight:600;margin:34px 0 16px;scroll-margin-top:30px}.article-body h3{font-size:18px;margin:25px 0 12px}.article-body p{margin:15px 0}.article-body a{text-decoration:underline;color:var(--green);text-underline-offset:3px}.article-body pre{position:relative;margin:22px 0;background:#1e3028;color:#e3edd7;border-radius:9px;padding:48px 22px 22px;overflow:auto;font:12px/1.85 var(--mono);max-width:100%;tab-size:2}.article-body code{font-family:var(--mono)}.article-body p code{background:#edf0e5;padding:3px 6px;border-radius:3px;font-size:13px}.copy-button{position:absolute;top:10px;right:11px;background:#ffffff12;border:1px solid #ffffff22;color:#d5e4c5;border-radius:4px;font-size:10px;padding:4px 10px}.code-label{position:absolute;top:14px;left:22px;font:9px var(--mono);letter-spacing:1px;color:#8ea080}.tok-tag{color:#b6d995}.tok-string{color:#e7c38f}.tok-keyword{color:#a4c9df}.tok-comment{color:#8b9b90}.article-end{display:flex;gap:20px;padding:25px;background:#eef3e5;border-radius:9px;margin-top:32px}.article-end>span{color:#819c54;font-size:28px}.article-end h2{font-size:16px;margin:0 0 7px}.article-end p{font-size:12px;color:var(--muted)}.prevnext{display:flex;justify-content:space-between;gap:25px;margin-top:30px;font-size:12px;color:var(--green)}.prevnext a{border:1px solid var(--line);padding:14px;border-radius:7px;flex:1}.prevnext a:last-child{text-align:right}.toc{border-left:1px solid var(--line);padding-left:20px;margin-top:92px}.toc nav{display:flex;flex-direction:column;gap:12px;font-size:11px;color:var(--muted)}.empty-state{padding-block:70px;text-align:center;min-height:330px}.empty-state>span{font-size:38px;color:var(--green)}.empty-state h2{font-size:25px;margin-bottom:15px}.empty-state p{margin:16px 0 25px;color:var(--muted)}.toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);background:var(--ink);color:white;padding:10px 20px;border-radius:7px;font-size:13px;box-shadow:0 4px 20px #0002;display:none;z-index:50}.toast.show{display:block}.translation-note{padding:20px;border:1px solid var(--line);border-radius:7px}
@media(min-width:1500px){.hero{padding-block:100px}.hero h1{font-size:53px}}
@media(max-width:1100px){.header-inner{gap:22px}#main-nav{gap:17px}.header-tools{gap:12px}.container{width:calc(100% - 48px)}.hero{gap:35px;padding-block:65px}.hero h1{font-size:38px}.hero-note{gap:12px;font-size:10px}.hero-actions{gap:18px}.code-lines{font-size:10px}.article-layout{grid-template-columns:185px minmax(0,1fr);gap:30px}.toc{display:none}.course-card{padding-inline:21px}.course-card h3{font-size:18px}.learning-strip .container>div{gap:18px}}
@media(max-width:760px){.container{width:calc(100% - 36px)}.header{height:auto;min-height:72px}.header-inner{min-height:72px;flex-wrap:wrap;gap:16px;position:relative}.brand{font-size:21px}.brand-mark{width:30px;height:31px;font-size:22px}.menu-toggle{display:block;border:1px solid var(--line);background:transparent;border-radius:5px;padding:5px 9px;font-size:11px;margin-left:auto}.header-tools{gap:12px}.language{border:0;padding:0;font-size:11px}.search-link{font-size:24px}#main-nav{display:none;order:4;width:100%;margin:0;gap:22px;padding:4px 0 18px;flex-wrap:wrap;font-size:13px}#main-nav.open{display:flex}.hero{grid-template-columns:1fr;padding-block:45px 48px;gap:45px}.hero h1{font-size:35px;line-height:1.38;margin-top:18px;letter-spacing:-1.2px}.hero p{font-size:14px;margin-top:18px}.hero-actions{margin-top:25px}.button{padding:12px 20px}.hero-note{gap:17px;font-size:10px;flex-wrap:wrap}.hero-visual{max-width:480px;width:calc(100% - 18px);margin:0 auto}.code-lines{font-size:12px;padding-block:19px}.preview{padding:18px 22px}.preview strong{font-size:32px}.visual-caption{bottom:-7px}.learning-strip>.container{flex-direction:column;align-items:flex-start;gap:12px;padding-block:19px}.learning-strip .container>div{gap:19px;font-size:11px}.learning-strip>.container>span{font-size:9px}.section{padding-block:42px}.section-heading{align-items:flex-start;gap:16px;flex-direction:column;margin-bottom:22px}.section-heading h2{font-size:24px;margin-top:8px}.section-heading>p{max-width:none}.course-grid,.project-grid{grid-template-columns:1fr;gap:16px}.course-card{padding:24px 24px 0}.course-top{margin-bottom:17px}.course-card h3{font-size:22px}.course-card p{font-size:13px;min-height:0}.card-bottom{margin-top:22px}.project-art{height:195px}.mini-browser{width:60%}.project-info{padding:22px}.project-info h3{font-size:18px}.project-info p{font-size:13px}.example-list>a{gap:12px}.example-symbol{width:32px;font-size:14px}.example-list h3{font-size:15px}.example-list p{font-size:12px}.search-inner{flex-direction:column;align-items:flex-start;gap:20px}.search-inner form{width:100%;max-width:none}.search-inner h2{font-size:24px}.footer{flex-direction:column;align-items:flex-start;gap:24px}.footer-links{flex-wrap:wrap;gap:20px}.listing-heading h1{font-size:32px}.listing-heading p{font-size:14px}.category-tabs{gap:8px}.category-tabs a{font-size:11px;padding:6px 10px}.lesson-row{gap:14px;padding:22px 0;align-items:flex-start}.lesson-icon{width:30px;height:30px;font-size:14px}.lesson-row h2{font-size:18px}.read-label{display:none}.lesson-row p{font-size:12px}.article-layout{display:block;padding-block:25px 45px}.lesson-sidebar{position:static;border-bottom:1px solid var(--line);padding-bottom:16px;margin-bottom:28px}.lesson-sidebar h2,.sidebar-note{display:none}.back-link{margin-bottom:12px}.lesson-sidebar nav{flex-direction:row;overflow:auto;gap:8px;padding-bottom:5px}.lesson-sidebar nav a{white-space:nowrap;padding:7px 10px;border:1px solid var(--line);font-size:11px}.article h1{font-size:29px}.article .breadcrumb{margin-bottom:24px}.article-lead{font-size:14px}.article-body{font-size:14px}.article-body h2{font-size:22px}.article-body pre{font-size:11px;padding-inline:15px}.article-end{padding:20px}.prevnext{gap:12px;font-size:11px}.prevnext a{padding:12px}.desktop-break{display:none}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important;animation:none!important}}
@media print{.header,.footer,.search-section,.lesson-sidebar,.toc,.copy-button,.print-button,.prevnext,.toast{display:none!important}.container{width:100%}.article-layout{display:block;padding:0}.article-body pre{white-space:pre-wrap;background:#f3f3f3;color:#111;border:1px solid #ccc}.article{max-width:none}.article-body h2{break-after:avoid}.article-end{break-inside:avoid}body{background:white}}

@media(max-width:760px){.header-inner{gap:10px}.header .brand{font-size:18px;gap:6px}.header-tools{margin-left:auto;gap:10px}.menu-toggle{margin-left:0;order:3}.language span{display:none}.hero-actions{flex-wrap:wrap;gap:18px}.hero-actions .button,.hero-actions .text-link{white-space:nowrap}}

.language-picker{position:relative}.language-trigger{display:flex;align-items:center;gap:7px;white-space:nowrap;border:1px solid #cbd7bd;background:#f4f7ef;border-radius:7px;padding:7px 11px;font-size:12px;color:var(--green)}.language-trigger[aria-expanded=true]{background:#e4edd9}.language-options{position:absolute;top:calc(100% + 10px);right:0;width:180px;padding:9px;background:#fff;border:1px solid var(--line);border-radius:10px;box-shadow:0 12px 35px #20362c20;z-index:100}.language-options[hidden]{display:none}.language-options p{padding:4px 8px 8px;color:var(--muted);font-size:10px}.language-options a{display:flex;justify-content:space-between;align-items:center;padding:9px 10px;font-size:13px;border-radius:6px}.language-options a:hover,.language-options a:focus-visible{background:#f0f4e8}.language-options a[aria-current]{color:var(--green);font-weight:600;background:#eaf0e0}.language-chevron{transition:transform .15s}.language-trigger[aria-expanded=true] .language-chevron{transform:rotate(180deg)}
@media(max-width:760px){.language-trigger{padding:6px 8px;font-size:11px;gap:4px}.header-tools{gap:8px}}

.course-roadmap{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,220px),1fr));gap:16px;margin:28px 0}.course-roadmap>div,.lesson-brief{padding:22px;background:#edf4ed;border:1px solid #dce6dc;border-radius:12px}.course-roadmap h2{font-size:18px;margin:0 0 10px}.course-roadmap p,.course-method{font-size:15px;line-height:1.8;color:#526558}.lesson-brief h2{margin-top:12px!important;font-size:20px!important}.solution{border:1px solid #c8d9cb;border-radius:10px;padding:18px;margin:24px 0}.solution summary{cursor:pointer;font-weight:700;color:#176343}.solution[open] summary{margin-bottom:18px}.solution summary:focus-visible{outline:3px solid #176343;outline-offset:5px}.article-body p{overflow-wrap:anywhere}.lesson-sidebar nav{max-height:65vh;overflow:auto}
@media(max-width:700px){.lesson-sidebar nav{max-height:none}.lesson-brief{padding:16px}.course-roadmap{grid-template-columns:1fr}}
@media print{.solution:not([open])>*:not(summary){display:block}}

/* Compact homepage introduction and policy pages, revision 5. */
.hero{padding-block:38px 40px;gap:44px}.hero h1{font-size:clamp(32px,3.1vw,44px);margin-top:14px;line-height:1.25}.hero p{margin-top:16px}.hero-actions{margin-top:20px}.hero-note{margin-top:17px}.hero .window-bar{padding-block:10px}.hero .code-lines{padding-block:14px;line-height:1.8}.hero .preview{padding:14px 20px;margin-bottom:14px}.hero .preview strong{font-size:28px;margin-top:6px}.hero .preview strong span{font-size:32px}.hero .preview-pill{margin-top:10px;padding-block:5px}.hero .visual-caption{display:none}.hero-visual{padding-bottom:10px}.footer-links{flex-wrap:wrap;justify-content:flex-end;max-width:680px;row-gap:12px}.policy-layout{max-width:900px;padding-block:42px 60px}.policy-layout .article-body{max-width:760px}.policy-date{color:var(--muted);font-size:13px}.policy-layout .article-body a{overflow-wrap:anywhere}
@media(max-width:760px){.hero{padding-block:28px 30px;gap:0}.hero h1{font-size:32px;margin-top:12px}.hero p{margin-top:14px}.hero-visual{display:none}.hero-actions{margin-top:18px}.hero-note{margin-top:16px}.footer-links{justify-content:flex-start}.policy-layout{padding-block:28px 40px}}

/* Grouped tutorial disclosure and deliberate course selection. */
.tutorial-picker{position:relative}.tutorial-trigger{border:0;background:none;padding:10px 0;font:inherit;display:flex;gap:7px;align-items:center}.tutorial-trigger:hover{color:var(--green)}.tutorial-trigger>span{transition:transform .15s}.tutorial-trigger[aria-expanded=true]>span{transform:rotate(180deg)}.tutorial-options{position:absolute;top:calc(100% + 12px);right:-150px;width:620px;max-width:calc(100vw - 32px);padding:22px;background:var(--paper);border:1px solid var(--line);border-radius:12px;box-shadow:0 16px 40px #20362c20;z-index:80}.tutorial-options[hidden]{display:none}.tutorial-groups{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.tutorial-groups h2{font-size:11px;color:var(--muted);letter-spacing:.3px;margin-bottom:10px}.tutorial-groups a{display:block;padding:8px 6px;border-radius:5px;font-size:13px;overflow-wrap:anywhere}.tutorial-groups a:hover,.tutorial-groups a[aria-current=page]{background:#eaf1e5;color:var(--green)}.tutorial-all{display:block;border-top:1px solid var(--line);padding-top:14px;margin-top:16px;color:var(--green);font-size:12px}.course-switcher{display:flex;align-items:center;gap:18px;padding-block:18px;border-block:1px solid var(--line);margin-bottom:24px}.course-switcher label{font-size:13px;color:var(--muted)}.course-switcher>div{display:flex;gap:10px;align-items:center}.course-switcher select{min-width:260px;max-width:100%;font:inherit;color:var(--ink);background:white;border:1px solid #ccd7c9;border-radius:7px;padding:11px 36px 11px 13px}.course-switcher select:focus-visible{outline:3px solid #719d63;outline-offset:3px}.course-switcher .button{padding:10px 18px;white-space:nowrap}
@media(min-width:761px) and (max-width:1000px){.tutorial-options{right:-180px;width:540px}}
@media(max-width:760px){#main-nav.open{display:flex;align-items:stretch;gap:8px}#main-nav>a{padding:8px 12px;border-radius:6px;background:#f0f3eb}#main-nav>.tutorial-picker{order:5;width:100%}.tutorial-trigger{width:100%;justify-content:space-between;padding:10px 12px;background:#f0f3eb;border-radius:6px}.tutorial-options{position:static;width:100%;max-width:none;margin-top:8px;padding:16px;box-shadow:none}.tutorial-groups{grid-template-columns:1fr;gap:16px}.tutorial-groups section{border-bottom:1px solid var(--line);padding-bottom:10px}.tutorial-groups h2{margin-bottom:5px}.tutorial-groups a{padding:7px 6px}.course-switcher{align-items:stretch;flex-direction:column;gap:8px}.course-switcher>div{width:100%}.course-switcher select{width:100%;min-width:0;flex:1}.course-switcher .button{padding:10px 14px}}