:root{--ink:#22372f;--muted:#65746c;--green:#237b65;--line:#e4e9e5;--surface:#f7f9f6;--sidebar:266px}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;background:#fff;color:var(--ink);font:15px/1.8 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}a{color:var(--green);text-decoration:none}a:hover{text-decoration:underline}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 #378d77;outline-offset:4px}.skip{position:fixed;top:-80px;left:20px;z-index:20;background:white;padding:8px 20px}.skip:focus{top:10px}header{height:76px;position:fixed;inset:0 0 auto;z-index:5;background:rgba(255,255,255,.97);border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;padding:0 35px;gap:16px}.brand,.brand>a,.header-actions{display:flex;align-items:center;gap:12px}.brand>a{color:var(--ink)}.brand>a:hover{text-decoration:none}.brand strong{font-size:22px;letter-spacing:-.7px}.brand>span:last-child{font-size:13px;color:var(--muted)}.site-logo{display:block;width:36px;height:36px;object-fit:contain;flex-shrink:0}.divider{width:1px;height:20px;background:var(--line);margin:0 3px}.header-actions{gap:26px;font-size:13px}.header-actions>a{color:var(--muted)}#menu{display:none;background:white;border:1px solid var(--line);border-radius:6px;padding:3px 10px}#sidebar{position:fixed;top:76px;bottom:0;left:0;width:var(--sidebar);padding:25px 20px 18px 26px;background:#fafbf9;border-right:1px solid var(--line);overflow-y:auto;z-index:4}.search{display:flex;align-items:center;gap:8px;padding:6px 10px;border:1px solid #dce3dd;background:white;border-radius:7px;color:var(--muted)}.search input{width:100%;min-width:0;border:0;background:none;font-size:13px;color:var(--ink);outline-offset:2px}.search span{font-size:22px;line-height:1}.nav-group{font-size:11px;font-weight:650;letter-spacing:.6px;color:#7d8981;margin:26px 12px 8px}#sidebar nav>a{display:block;font-size:13px;color:#52635a;padding:7px 12px;margin:3px 0;border-radius:6px;line-height:1.7}#sidebar nav>a:hover{background:#eef3ee;text-decoration:none}#sidebar nav>a[aria-current]{color:#1d6d57;background:#e7f0e9;font-weight:650}#sidebar [hidden]{display:none!important}.sidebar-foot{border-top:1px solid var(--line);padding:20px 12px 3px;margin-top:28px;color:#78877d;font-size:11px}.dot{display:inline-block;width:6px;height:6px;background:#4f957a;border-radius:50%;margin-right:5px}#search-status{font-size:12px;color:var(--muted);margin:8px 5px 0}#search-status:empty{display:none}.content{margin:76px 0 0 var(--sidebar);display:flex;gap:48px;max-width:1300px;padding:40px 52px 0}main{width:100%;max-width:780px;min-width:0}.breadcrumb{font-size:11px;color:#819087;display:flex;gap:12px;margin-bottom:34px}.page-heading{padding-bottom:26px;border-bottom:1px solid var(--line);margin-bottom:28px}.eyebrow{font-size:10px;letter-spacing:1.8px;color:var(--green);font-weight:700}h1{font-size:34px;line-height:1.3;margin:10px 0 14px;letter-spacing:-1px}.page-heading>p{color:var(--muted);font-size:15px;margin:0}h2{font-size:21px;line-height:1.5;margin:35px 0 16px;letter-spacing:-.4px}h3{font-size:15px;margin-top:24px}article p{margin:12px 0;color:#4c5d53}article li{padding:4px 0;color:#4c5d53}article ul,article ol{padding-left:24px}code{font:12px/1.75 ui-monospace,SFMono-Regular,Consolas,monospace;background:#f0f4f0;padding:3px 5px;border-radius:4px;overflow-wrap:anywhere;color:#285f4e}table{border:1px solid var(--line);border-spacing:0;border-radius:8px;width:100%;overflow:hidden;font-size:13px;margin:20px 0;table-layout:fixed}th,td{padding:13px 16px;border-bottom:1px solid var(--line);text-align:left;overflow-wrap:anywhere}th{font-size:12px;background:var(--surface);font-weight:600}tr:last-child td{border-bottom:0}td:first-child,th:first-child{width:36%}.note{margin:25px 0;background:#f1f6ef;border-left:3px solid #81a483;border-radius:0 7px 7px 0;padding:16px 20px;color:#4e6654;font-size:13px}.code{margin:22px 0;border:1px solid var(--line);border-radius:9px;overflow:hidden;background:#f8faf7}.codebar{display:flex;justify-content:space-between;align-items:center;padding:8px 16px;background:#eff3ee;border-bottom:1px solid var(--line);font-size:11px;color:#66776b}.copy{background:white;border:1px solid #d8e0d7;border-radius:5px;padding:2px 10px;font-size:11px;color:#49634f}.copy:hover{background:#e4ede4}pre{margin:0;padding:20px;overflow:auto;line-height:1.9}pre code{padding:0;border-radius:0;background:none;white-space:pre;overflow-wrap:normal;font-size:12px;color:#294e3c}.hero{background:linear-gradient(115deg,#f2f6ee,#eaf2ec);padding:35px;border:1px solid #e2ebe0;border-radius:12px;position:relative}.hero h2{font-size:43px;font-weight:600;letter-spacing:-1.8px;line-height:1.25;margin:18px 0}.hero>p{max-width:470px;font-size:14px}.primary{display:inline-flex;gap:36px;margin-top:14px;background:var(--green);border-radius:6px;padding:9px 18px;color:white;font-size:12px}.primary:hover{background:#1c6855;text-decoration:none}.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:13px;margin:20px 0 36px}.cards>a{border:1px solid var(--line);border-radius:8px;padding:18px;color:var(--ink)}.cards>a:hover{border-color:#6ca18b;text-decoration:none;background:#fcfdfb}.cards h3{margin:13px 0 6px;font-size:14px}.cards p{font-size:11px;color:var(--muted);margin:0}.num{font:11px ui-monospace,monospace;color:var(--green);background:#edf3eb;padding:4px 6px;border-radius:4px}.toc{width:170px;min-width:130px;position:sticky;top:112px;align-self:flex-start;font-size:11px;padding-top:16px}.toc>p{font-size:11px;font-weight:600;margin:0 0 13px}.toc nav{border-left:1px solid var(--line)}.toc a{display:block;padding:5px 0 5px 15px;color:#7a877e;line-height:1.6}.toc a:hover{color:var(--green)}.pager{display:flex;gap:18px;margin-top:44px;padding-top:26px;border-top:1px solid var(--line)}.pager>a{flex:1;border:1px solid var(--line);border-radius:7px;padding:16px;display:flex;flex-direction:column;gap:6px;color:var(--ink)}.pager>a:hover{border-color:#6ca18b;text-decoration:none}.pager small{font-size:10px;color:#7c897e}.pager strong{font-weight:500;font-size:13px}footer{display:flex;justify-content:space-between;gap:12px;padding:26px 0;color:#8c978f;font-size:10px}.reference{font-size:12px}#toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);background:#233e31;color:white;border-radius:8px;font-size:13px;padding:8px 20px;z-index:10;display:none}#toast.show{display:block}@media(min-width:1600px){.content{padding-left:80px}}@media(max-width:1150px){.toc{display:none}.content{padding:34px 36px 0}}@media(max-width:760px){header{height:64px;padding:0 18px}.brand strong{font-size:19px}.brand{gap:8px}.brand>span:last-child{font-size:11px}.header-actions{gap:12px}.header-actions>a:first-child{display:none}.header-actions>a{font-size:11px}#menu{display:block}#sidebar{display:none;top:64px;width:min(310px,88vw);box-shadow:15px 0 40px #203d2c15}#sidebar.open{display:block}.content{margin:64px 0 0;padding:24px 22px 0}.breadcrumb{margin-bottom:25px}h1{font-size:28px}.hero{padding:24px}.hero h2{font-size:36px}.cards{gap:9px}.cards>a{padding:12px}.cards p{font-size:11px}table{font-size:12px}th,td{padding:10px}pre{padding:16px}.pager{gap:10px}.pager>a{padding:12px}footer{flex-direction:column;gap:2px}.page-heading>p{font-size:14px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}@media print{header,#sidebar,.toc,.pager,.copy{display:none}.content{margin:0;padding:0}main{max-width:none}.code,table,.note{break-inside:avoid}}
/* Beginner onboarding: downloads, system choices and visible completion checks. */
kbd{display:inline-block;font:11px/1.6 ui-monospace,SFMono-Regular,Consolas,monospace;background:#f6f8f4;border:1px solid #dce3dc;border-bottom-width:2px;border-radius:4px;padding:1px 6px;color:#3f5647;white-space:nowrap}.download-list{display:grid;gap:10px;margin:20px 0 28px}.download-item{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:17px 18px;border:1px solid var(--line);border-radius:8px;background:#fbfcfa}.download-item>div{min-width:0}.download-item strong{font-size:14px}.download-item p{font-size:12px;margin:5px 0 0;color:var(--muted)}.download-item>a{white-space:nowrap;font-size:12px;font-weight:600;background:#e9f2ea;border:1px solid #d8e7da;border-radius:5px;padding:6px 11px}.download-item>a:hover{background:#dfece2;text-decoration:none}.os-cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin:20px 0 26px}.os-cards>a{display:flex;flex-direction:column;gap:9px;border:1px solid var(--line);border-radius:8px;padding:18px;color:var(--ink);background:#fbfcfa}.os-cards>a:hover{border-color:var(--green);text-decoration:none}.os-cards strong{font-size:17px}.os-cards span{font-size:12px;color:var(--muted)}.checkpoint{padding:18px 20px;margin:22px 0;background:#eef6f0;border:1px solid #d8e8db;border-radius:8px}.checkpoint>strong{font-size:13px;color:#256647}.checkpoint>p{font-size:13px;margin:7px 0 0}.next-step{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:20px 0;margin-top:26px;border-top:1px solid var(--line)}.next-step>span{font-size:12px;color:var(--muted)}.next-step>a{font-size:13px}.glossary{border:1px solid var(--line);border-radius:8px;padding:8px 20px}.glossary dt{font-size:14px;font-weight:650;margin-top:15px}.glossary dd{margin:5px 0 18px;font-size:13px;color:var(--muted)}@media(max-width:760px){.download-item{align-items:flex-start;padding:15px;gap:12px}.download-item>a{padding:5px 8px;font-size:11px}.os-cards{grid-template-columns:1fr}.os-cards>a{flex-direction:row;align-items:center;justify-content:space-between;padding:16px}.os-cards strong{font-size:16px}.os-cards span{font-size:11px}.next-step{align-items:flex-start}.next-step>a{max-width:75%}}