/* A readable lesson, with the same restrained palette as the PixelCraft hub. */
.pl-hero{padding:170px 0 48px;background:#0e1721;border-bottom:1px solid #293642}.pl-back{display:inline-block;color:#a8b8c5;font-size:13px;margin-bottom:30px}.pl-hero .pc-eyebrow{margin-bottom:16px}.pl-hero h1{font-family:"Arial Black",Arial,"Microsoft YaHei",sans-serif;font-size:clamp(34px,4vw,54px);line-height:1.16;letter-spacing:-1.5px;max-width:1000px;margin:0 0 18px}.pl-subtitle{font-size:18px;line-height:1.8;color:#b7c5ce;max-width:790px;margin:0}.pl-meta{display:flex;flex-wrap:wrap;gap:10px 24px;color:#8fa8b8;font:12px Consolas,"Microsoft YaHei",monospace;margin-top:24px}.pl-hero .pc-actions{margin-top:28px}.pl-hero .pc-button{padding:13px 20px;font-size:14px}
.pl-reading-grid{display:grid;grid-template-columns:228px minmax(0,830px);gap:64px;align-items:start;padding-top:48px;padding-bottom:65px;scroll-margin-top:16px}.pl-sidebar{position:sticky;top:145px;min-width:0}.pl-toc{border-top:2px solid var(--pc-green);padding-top:15px}.pl-toc summary{cursor:pointer;font-size:14px;font-weight:700;line-height:1.6}.pl-toc ol{margin:18px 0;padding-left:25px;color:#7f99aa;font:11px Consolas,monospace}.pl-toc li{padding-left:4px;margin:0 0 12px;line-height:1.45}.pl-toc a{font:12px/1.6 Arial,"Microsoft YaHei",sans-serif;color:#a9bac6}.pl-toc a:hover{color:var(--pc-green)}.pl-toc-download{display:block;border-top:1px solid #293742;padding-top:15px}.pl-article{min-width:0;font-size:16px;line-height:1.9;color:#c1ccd4;overflow-wrap:anywhere}.pl-article p{margin:0 0 20px}.pl-intro{padding:25px 28px;background:#14221e;border:1px solid #304638}.pl-intro .pc-kicker{font-size:10px;color:var(--pc-green)}.pl-intro .pl-achievement{font-size:20px;line-height:1.7;color:#e8eeeb;font-weight:700;margin-bottom:12px}.pl-intro p:last-child{margin:0}.pl-prerequisite{font-size:13px;color:#93ada1}.pl-section{padding-top:45px;margin-top:40px;border-top:1px solid #293742;scroll-margin-top:16px}.pl-article .pl-step-label{font:11px Consolas,monospace;color:var(--pc-green);letter-spacing:1px;margin:0 0 14px}.pixel-lesson .pl-article h2{font-size:clamp(25px,2.6vw,31px);line-height:1.35;letter-spacing:-.5px;color:#eff3ed;margin:0 0 16px}.pl-article h3{font-size:18px;line-height:1.6;margin:25px 0 12px;color:#ecf0eb}.pl-article .pl-section-lead{color:#92a8b8;margin-bottom:27px}.pl-definitions{margin:24px 0;border-top:1px solid #2b3a46}.pl-definitions>div{display:grid;grid-template-columns:170px minmax(0,1fr);gap:22px;padding:17px 0;border-bottom:1px solid #26343f}.pl-definitions dt{color:#e0e9e1;font-size:14px;font-weight:700}.pl-definitions dd{margin:0;font-size:14px;line-height:1.85}.pl-note{border-left:3px solid #8eba64;background:#14211e;padding:18px 23px;margin:25px 0;color:#b9cdbf}.pl-note h3{margin:0 0 7px;font-size:15px;color:#cceaac}.pl-note p{font-size:14px;line-height:1.85;margin:0}.pl-code{border:1px solid #2d3e4d;margin:24px 0;background:#080f16;min-width:0}.pl-code>p{padding:11px 18px;margin:0;background:#14212c;border-bottom:1px solid #293947;font-size:12px;line-height:1.7;color:#9db3c4}.pl-code pre{font:13px/1.85 Consolas,"Courier New",monospace;padding:21px;margin:0;max-width:100%;overflow:auto;white-space:pre;tab-size:4;color:#d6ecd2}.pl-code code{font:inherit;background:none;padding:0;color:inherit}.pl-figure{margin:30px 0}.pl-figure>a{display:block;background:#10171d;border:1px solid #34424d}.pl-figure img{display:block;width:100%;height:auto;max-width:100%}.pl-figure figcaption{font-size:12px;line-height:1.8;color:#869fae;padding-top:10px}.pl-figure figcaption>span{display:block;color:#acc999;margin-top:4px}.pl-steps{display:flex;flex-wrap:wrap;gap:12px 28px;padding-left:22px;font-size:13px;color:#cfe5bb;margin:25px 0}.pl-steps li{padding-left:3px}.pl-checklist{padding:20px 24px 20px 44px;background:#14221e;border:1px solid #304638;font-size:14px}.pl-checklist li{padding-left:5px;margin:8px 0}.pl-downloads{padding:28px;border:1px solid #394d39;background:#15221b;margin-top:48px;scroll-margin-top:16px}.pl-downloads p:not(.pc-kicker){font-size:14px}.pl-downloads .pc-actions{gap:16px;margin-top:23px}.pl-downloads .pc-button{font-size:13px;padding:13px 17px;gap:24px}.pl-references{margin-top:38px;font-size:13px;color:#90a8b9}.pixel-lesson .pl-references h2{font-size:20px}.pl-references ul{padding-left:20px;line-height:2.1}.pl-references a{color:#c4d9b4;text-decoration:underline;text-underline-offset:4px}.pl-next{display:block;margin-top:35px;padding:24px 0;border-top:1px solid #354536}.pl-next>span{display:block;font:10px Consolas,monospace;color:#91a99e;margin-bottom:10px}.pl-next strong{display:flex;justify-content:space-between;gap:20px;color:#e0edda;font-size:20px;line-height:1.5}.pl-next strong span{color:var(--pc-green)}
@media(max-width:1000px){.pl-reading-grid{grid-template-columns:190px minmax(0,1fr);gap:35px}.pl-definitions>div{grid-template-columns:1fr;gap:4px}.pl-hero{padding-top:155px}}
@media(max-width:760px){.pl-hero{padding:125px 0 32px}.pl-back{margin-bottom:24px}.pl-hero h1{font-size:34px;letter-spacing:-.8px}.pl-subtitle{font-size:16px}.pl-meta{font-size:11px;gap:9px 17px}.pl-reading-grid{display:block;padding-top:30px}.pl-sidebar{position:static;margin-bottom:30px}.pl-toc{padding:16px;background:#111d27;border:1px solid #31434d}.pl-toc ol{columns:1;margin-bottom:14px}.pl-toc li{margin-bottom:9px}.pl-toc a{font-size:13px}.pl-article{font-size:15px;line-height:1.9}.pl-intro{padding:22px}.pl-intro .pl-achievement{font-size:18px}.pl-section{padding-top:30px;margin-top:30px}.pl-code pre{font-size:12px;padding:16px}.pl-note{padding:16px 18px}.pl-downloads{padding:22px}.pl-downloads .pc-actions{display:grid;grid-template-columns:1fr}.pl-figure{margin:24px 0}.pl-next strong{font-size:18px}}
@media print{.site-header,.tm-language-bar,.pl-sidebar,.pl-hero .pc-actions,.pl-downloads,.pc-footer,.tm-cookie-widget{display:none!important}.pixel-lesson{background:white;color:#17212a}.pl-hero{padding:20px 0;background:white}.pl-hero h1,.pl-article h2,.pl-article h3{color:#17212a!important}.pl-reading-grid{display:block;width:100%;padding:0}.pl-section{break-before:auto}.pl-figure,.pl-code,.pl-note{break-inside:avoid}.pl-article{color:#17212a}.pl-code pre{white-space:pre-wrap;color:#17212a}.pl-code,.pl-code>p,.pl-intro,.pl-note{background:#f1f5f2;color:#17212a}.pl-definitions dt{color:#17212a}}

/* Long lessons keep every chapter reachable without covering the article. */
@media(min-width:761px){.pl-sidebar{max-height:calc(100dvh - 170px);overflow-y:auto;scrollbar-width:thin;scrollbar-color:#42574c transparent;padding-right:10px}}
.pl-texture>a{max-width:256px}.pl-texture img{image-rendering:pixelated}
.pl-lesson-navigation{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:0 30px}
.pixel-lesson .mc-learning-review{padding:28px;margin-top:40px;background:#14221e;border:1px solid #304638;scroll-margin-top:16px;font-size:14px}
.pixel-lesson .mc-learning-review .mc-course-kicker{color:#b3db8c;font-size:12px}
.pixel-lesson .mc-learning-review ul{padding-left:20px}.pixel-lesson .mc-learning-review li{margin-bottom:10px}
@media(max-width:760px){.pl-lesson-navigation{grid-template-columns:1fr}.pixel-lesson .mc-learning-review{padding:20px}}