@charset "UTF-8";
:root{--green:#187a61;--green-dark:#105e4a;--mint:#eaf5ef;--ink:#203831;--muted:#708078;--line:#e3eae5;--paper:#fcfdfb;--white:#fff;--nav:76px;font-family:Inter,"Segoe UI","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;font-size:15px;line-height:1.7}a{color:inherit;text-decoration:none}button,input{font:inherit}button,a,input{ -webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:default}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #5fae97;outline-offset:4px}::selection{background:#caeada}button{color:inherit}svg{vertical-align:middle}.wrap{width:min(1180px,calc(100% - 64px));margin:auto}.skip{position:fixed;left:20px;top:-100px;background:var(--green);color:#fff;padding:12px;z-index:100}.skip:focus{top:10px}.site-header{height:var(--nav);border-bottom:1px solid var(--line);background:rgba(252,253,251,.96);position:sticky;top:0;z-index:30}.header-inner{height:100%;display:flex;align-items:center;gap:32px}.brand{display:flex;align-items:center;gap:12px;white-space:nowrap}.brand-mark{display:grid;place-items:center;background:var(--green);color:#fff;width:37px;height:37px;border-radius:11px;font-weight:850;font-size:24px;line-height:1;letter-spacing:-3px;padding-right:3px}.brand-name{font-size:17px;font-weight:750;letter-spacing:.3px}.brand-name small{display:block;font-size:9px;letter-spacing:2.1px;font-weight:500;color:var(--muted);line-height:1.3}.top-nav{display:flex;align-items:center;gap:30px;margin-left:auto;font-size:13px}.top-nav a{padding:25px 0;position:relative}.top-nav a:hover,.top-nav a[aria-current]{color:var(--green)}.top-nav a[aria-current]:after{content:"";position:absolute;bottom:0;left:0;right:0;height:3px;background:var(--green)}.header-action{border:1px solid var(--line);border-radius:7px;padding:7px 15px;font-size:12px;background:white}.arrow{margin-left:12px}.eyebrow{color:var(--green);font-size:11px;font-weight:700;letter-spacing:2px;text-transform:uppercase}.hero{position:relative;overflow:hidden;border-bottom:1px solid var(--line);background:radial-gradient(ellipse at 83% 30%,#e2f0e680,transparent 52%),var(--paper)}.hero-grid{display:grid;grid-template-columns:1.15fr 1fr;gap:68px;align-items:center;padding:78px 0 70px}.status-pill{display:inline-flex;gap:9px;align-items:center;border:1px solid #dce8dd;background:#f2f8ef;border-radius:30px;padding:5px 12px;font-size:11px;color:#54745f}.status-pill:before{content:"";width:6px;height:6px;background:#5a9970;border-radius:50%}.hero h1{font-size:clamp(42px,4.3vw,64px);line-height:1.22;font-weight:800;letter-spacing:-2px;margin:24px 0 8px}.hero h1 em{font-style:normal;color:var(--green)}.english-title{font-size:13px;letter-spacing:4px;color:#83958a;margin:12px 0 25px}.hero-description{font-size:14px;color:#697b72;line-height:2;max-width:560px}.hero-description strong{color:#304f41;font-weight:600}.hero-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:30px}.button{display:inline-flex;align-items:center;justify-content:center;padding:12px 24px;border:1px solid var(--line);border-radius:7px;font-size:13px;font-weight:600;background:#fff;transition:transform .2s,background .2s}.button:hover{transform:translateY(-2px);background:#f0f6f1}.button.primary{background:var(--green);border-color:var(--green);color:#fff;box-shadow:0 5px 12px #166c5712}.button.primary:hover{background:var(--green-dark)}.hero-note{display:flex;gap:22px;margin-top:24px;font-size:11px;color:#89978e}.hero-note span:before{content:"✓";color:var(--green);margin-right:6px}.hero-art{height:375px;position:relative;display:grid;place-items:center;background-image:radial-gradient(#9bbba04d 1px,transparent 1px);background-size:22px 22px}.orbit{position:absolute;width:310px;height:310px;border:1px solid #c7dccd;border-radius:50%;transform:rotate(-25deg)}.orbit:after{content:"";position:absolute;width:360px;height:190px;left:-26px;top:60px;border:1px solid #d6e5d8;border-radius:50%;transform:rotate(-30deg)}.book{position:relative;width:220px;height:279px;background:#236950;border-radius:5px 15px 15px 5px;transform:rotate(-9deg);box-shadow:17px 20px 0 -5px #d6e4d8,26px 30px 45px #294e3420;border-left:13px solid #19543f;color:#f5f8e8;padding:27px 23px;z-index:1}.book:before{content:"";position:absolute;right:5px;bottom:-8px;left:0;height:10px;background:repeating-linear-gradient(#eeeee0 0 2px,#d7ddcc 2px 3px);border-radius:0 0 7px 2px;z-index:-1}.book-top{font-size:8px;letter-spacing:2px;border-bottom:1px solid #ffffff38;padding-bottom:14px}.book-symbol{font-size:65px;font-weight:800;line-height:1.4;letter-spacing:-8px;margin-top:13px}.book-title{font-size:25px;letter-spacing:1px;font-weight:800;line-height:1.1}.book-title small{display:block;font-size:12px;letter-spacing:2px;font-weight:400;margin-top:8px}.book-bottom{font-size:8px;letter-spacing:1px;margin-top:27px;display:flex;justify-content:space-between;color:#bcd8c6}.floating-tag{position:absolute;z-index:2;display:flex;gap:10px;align-items:center;background:#fff;border:1px solid #e2e9df;box-shadow:0 8px 24px #2a4c3310;border-radius:9px;padding:12px 17px;font-size:11px;color:#587262;white-space:nowrap}.floating-tag b{font-family:Consolas,monospace;font-size:18px;color:var(--green)}.tag-code{top:32px;right:-3px;transform:rotate(5deg)}.tag-learn{bottom:30px;left:-8px;transform:rotate(-3deg)}.art-caption{position:absolute;right:4px;bottom:5px;font:10px Consolas,monospace;letter-spacing:1px;color:#829d89}.section{padding:56px 0}.section-head{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:25px}.section-head h2{font-size:26px;margin:6px 0 0;letter-spacing:-.6px}.section-head p{color:var(--muted);font-size:12px;margin:0}.text-link{color:var(--green);font-size:12px}.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}.feature-card{border:1px solid var(--line);border-radius:10px;background:#fff;padding:25px;position:relative;transition:transform .2s,border-color .2s}.feature-card:hover{transform:translateY(-4px);border-color:#b5d4c1}.feature-icon{width:39px;height:39px;display:grid;place-items:center;background:#edf5ed;border-radius:10px;color:var(--green);font:18px Consolas,monospace}.feature-card:nth-child(2) .feature-icon{color:#53738b;background:#eef3f7}.feature-card:nth-child(3) .feature-icon{color:#927c45;background:#faf6e9}.feature-card h3{font-size:17px;margin:16px 0 7px}.feature-card p{font-size:12px;line-height:1.9;color:var(--muted);margin:0 0 22px}.feature-card .card-link{font-size:11px;color:var(--green)}.feature-card .number{position:absolute;right:24px;top:29px;font:11px Consolas,monospace;color:#a2aea4}.roadmap{background:#f2f6ef;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:26px;margin-top:30px}.step-number{color:#8ca08d;font:11px Consolas,monospace;display:flex;align-items:center;gap:18px}.step-number:after{content:"";height:1px;background:#d8e3d4;flex:1}.step h3{font-size:15px;margin:14px 0 8px}.step p{font-size:12px;color:var(--muted);margin:0}.step a:hover{color:var(--green)}.welcome-strip{display:flex;gap:24px;align-items:center;justify-content:space-between;padding:38px 0}.welcome-strip h2{font-size:19px;margin:0 0 5px}.welcome-strip p{font-size:12px;color:var(--muted);margin:0}.site-footer{padding:23px 0;border-top:1px solid var(--line);font-size:11px;color:#8b978f}.footer-inner{display:flex;justify-content:space-between;gap:16px}.footer-inner a:hover{color:var(--green)}
/* Shared documentation layout */
.docs-page{background:white}.docs-page .header-inner{max-width:none;width:auto;margin:0 30px}.docs-layout{display:grid;grid-template-columns:260px minmax(0,1fr) 190px;max-width:1600px;margin:auto;min-height:calc(100vh - var(--nav))}.docs-sidebar{position:sticky;top:var(--nav);height:calc(100dvh - var(--nav));overflow-y:auto;border-right:1px solid var(--line);padding:25px 18px 40px;background:#fbfcfa;scrollbar-width:thin}.search-open{width:100%;display:flex;align-items:center;gap:10px;text-align:left;background:#fff;border:1px solid var(--line);border-radius:7px;padding:9px 12px;color:#859389;font-size:12px}.search-open kbd{margin-left:auto;background:#f4f6f2;padding:0 4px;border-radius:3px;font-size:10px}.sidebar-home{display:block;font-size:13px;margin:20px 0 10px;padding:8px 12px;color:var(--green);border-radius:5px}.sidebar-home[aria-current]{background:var(--mint)}.nav-group{border:0;margin:3px 0}.nav-group summary{padding:9px 10px;cursor:pointer;font-size:12px;font-weight:650;color:#536b5b;list-style:none;display:flex;gap:8px;align-items:center}.nav-group summary:before{content:"›";font-size:15px;color:#99ab9e}.nav-group[open] summary:before{transform:rotate(90deg)}.nav-group summary small{margin-left:auto;color:#9aa99f;font:10px Consolas,monospace}.nav-group a{display:block;font-size:12px;margin:2px 0 2px 12px;padding:6px 10px;line-height:1.6;color:#6f7f73;border-left:1px solid #e2e9df;overflow-wrap:anywhere}.nav-group a:hover{color:var(--green);background:#f1f6ef}.nav-group a[aria-current]{border-left:2px solid var(--green);color:var(--green);background:var(--mint);font-weight:600}.sidebar-bottom{border-top:1px solid var(--line);padding:20px 12px 0;margin-top:24px;font-size:11px;color:var(--muted)}.sidebar-bottom a{display:block;margin:7px 0}.docs-main{padding:40px clamp(24px,4vw,66px) 60px;min-width:0}.breadcrumbs{font-size:11px;color:#8b9a90;margin-bottom:28px;display:flex;flex-wrap:wrap;gap:10px}.breadcrumbs a:hover{color:var(--green)}.docs-main h1{font-size:32px;line-height:1.4;letter-spacing:-.7px;margin:10px 0 13px;overflow-wrap:anywhere}.doc-lead{font-size:14px;color:var(--muted);max-width:680px;line-height:1.9;margin-bottom:25px}.info-note{border-left:3px solid var(--green);padding:14px 18px;background:#f0f7f1;font-size:12px;color:#52745c;margin:25px 0 35px;border-radius:0 5px 5px 0}.docs-main h2{font-size:21px;margin:36px 0 18px}.topic-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.topic-card{padding:20px;border:1px solid var(--line);border-radius:8px;display:block;transition:border-color .2s,background .2s}.topic-card:hover{border-color:#a7c8b0;background:#fcfdfb}.topic-card .topic-label{font:10px Consolas,monospace;color:var(--green);letter-spacing:1px}.topic-card h3{font-size:15px;margin:8px 0}.topic-card p{font-size:12px;color:var(--muted);margin:0}.topic-card .topic-foot{display:flex;justify-content:space-between;margin-top:18px;font-size:10px;color:#91a092}.docs-toc{position:sticky;top:var(--nav);height:calc(100dvh - var(--nav));overflow-y:auto;padding:43px 20px 25px 0;font-size:11px;color:var(--muted)}.docs-toc strong{color:#526e5c;font-weight:600;display:block;margin-bottom:14px}.docs-toc a{display:block;padding:6px 0 6px 14px;border-left:1px solid var(--line);line-height:1.7;overflow-wrap:anywhere}.docs-toc a:hover{color:var(--green);border-left-color:var(--green)}.toc-tip{font-size:11px;line-height:1.9;margin-top:32px;background:#f6f8f4;padding:15px;border-radius:6px}.resource-list{border:1px solid var(--line);border-radius:8px;overflow:hidden}.resource-list a{display:flex;justify-content:space-between;padding:16px 20px;font-size:13px;border-bottom:1px solid var(--line)}.resource-list a:last-child{border:0}.resource-list a:hover{background:var(--mint)}.resource-list small{color:var(--muted)}.article-meta{font-size:11px;color:#8a9b8f;padding-bottom:22px;border-bottom:1px solid var(--line);margin-bottom:28px}.legacy-content{font-size:14px;line-height:1.95;color:#415449;overflow-wrap:anywhere}.legacy-content p{margin:18px 0;text-align:left!important}.legacy-content p:first-child{margin-top:0}.legacy-content [class*="STYLE"],.legacy-content font{font-family:inherit!important;font-size:inherit!important}.legacy-content .STYLE1,.legacy-content .STYLE10,.legacy-content .STYLE3,.legacy-content .STYLE6{color:inherit}.legacy-content .STYLE2{color:var(--green);font-weight:650}.legacy-content a{color:var(--green);text-decoration:underline;text-underline-offset:3px}.legacy-content img{max-width:100%;height:auto}.legacy-content table{max-width:100%;border-collapse:collapse;font-size:12px;display:block;overflow:auto;border-color:var(--line)}.legacy-content td,.legacy-content th{padding:10px;border:1px solid var(--line);font-family:inherit}.legacy-content pre{background:#f4f7f2;padding:18px;border:1px solid var(--line);border-radius:7px;overflow:auto;max-width:100%;white-space:pre;font:12px/1.8 Consolas,monospace}.legacy-content code{font-family:Consolas,monospace;color:var(--green)}.legacy-content li{margin:8px 0}.legacy-content .original-title{display:none}.article-pagination{display:flex;justify-content:space-between;gap:20px;margin-top:50px;border-top:1px solid var(--line);padding-top:24px;font-size:12px}.article-pagination a{max-width:48%;color:var(--green)}.article-pagination small{display:block;color:var(--muted);font-size:10px}.article-pagination a:last-child{text-align:right}.menu-toggle{display:none;background:#fff;border:1px solid var(--line);border-radius:6px;padding:6px 11px}.menu-backdrop{display:none}.back-top{position:fixed;right:22px;bottom:22px;padding:8px 13px;border:1px solid var(--line);border-radius:7px;background:#fff;color:var(--green);box-shadow:0 3px 12px #2038310a;z-index:20}.search-dialog{padding:0;border:1px solid var(--line);border-radius:12px;width:min(640px,calc(100% - 28px));max-height:80dvh;box-shadow:0 25px 100px #173b3233;background:var(--paper);color:var(--ink)}.search-dialog::backdrop{background:#1a302860;backdrop-filter:blur(4px)}.search-head{padding:18px 20px;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:12px}.search-head input{min-width:0;flex:1;background:transparent;border:0;outline:none;font-size:15px}.search-head button{border:1px solid var(--line);background:white;border-radius:4px;font-size:11px;padding:3px 7px}.search-results{overflow:auto;max-height:55dvh;padding:12px}.search-hint{font-size:12px;color:var(--muted);padding:4px 12px}.search-result{display:block;padding:12px;border-radius:7px}.search-result:hover,.search-result:focus{background:var(--mint)}.search-result b{display:block;font-size:14px}.search-result small{display:block;color:var(--muted);font-size:11px}.search-result p{font-size:12px;color:#7e8e83;margin:6px 0 0}.search-foot{font-size:10px;padding:10px 22px;border-top:1px solid var(--line);color:var(--muted)}
@media(min-width:1600px){.hero-grid{padding:100px 0 90px}.hero-art{height:400px}}
@media(max-width:1150px){.docs-layout{grid-template-columns:235px minmax(0,1fr)}.docs-toc{display:none}.hero-grid{gap:35px}.tag-code{right:0}.hero h1{font-size:48px}}
@media(max-width:800px){:root{--nav:66px}.wrap{width:calc(100% - 36px)}.top-nav{gap:18px}.header-inner{gap:15px}.header-action{display:none}.hero-grid{grid-template-columns:1fr 0.8fr;gap:10px;padding:45px 0}.hero h1{font-size:40px}.hero-art{transform:scale(.85);transform-origin:center}.hero-description{font-size:13px}.feature-grid{gap:12px}.feature-card{padding:19px}.steps{gap:18px}.docs-page .header-inner{margin:0 18px}.docs-page .top-nav{display:none}.menu-toggle{display:block;margin-left:auto}.docs-layout{display:block}.docs-sidebar{position:fixed;top:var(--nav);bottom:0;left:0;width:280px;z-index:25;transform:translateX(-100%);transition:transform .2s}.menu-open .docs-sidebar{transform:translateX(0)}.menu-open .menu-backdrop{display:block;position:fixed;inset:var(--nav) 0 0;background:#15352244;z-index:24;border:0;width:100%}.docs-main{padding:28px 24px 50px}.docs-main h1{font-size:28px}}
@media(max-width:600px){.brand-name{font-size:15px}.brand-mark{width:32px;height:32px;font-size:21px}.top-nav a{font-size:12px}.top-nav a:nth-child(n+2){display:none}.hero-grid{display:flex;flex-direction:column;padding:38px 0 27px}.hero-copy{width:100%}.hero h1{font-size:43px;letter-spacing:-1.5px}.english-title{font-size:11px;letter-spacing:3px;margin-bottom:19px}.hero-art{height:315px;width:min(370px,100%);margin:8px auto -15px;transform:scale(.9)}.hero-actions .button{padding:12px 23px}.hero-description{font-size:13px}.section{padding:36px 0}.section-head{align-items:start}.section-head h2{font-size:23px}.section-head p{max-width:135px;text-align:right}.feature-grid{grid-template-columns:1fr}.feature-card{padding:22px}.feature-card p{margin-bottom:15px}.steps{grid-template-columns:1fr 1fr;gap:25px}.welcome-strip{align-items:start;flex-direction:column;padding:28px 0}.footer-inner{flex-direction:column;gap:6px}.topic-grid{grid-template-columns:1fr}.docs-main{padding:24px 20px 45px}.resource-list a{gap:15px}.resource-list small{font-size:10px}.back-top{right:12px;bottom:12px}.hero-note{gap:16px}.article-pagination{gap:15px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}
@media print{.site-header,.docs-sidebar,.docs-toc,.back-top,.article-pagination,.menu-backdrop{display:none!important}.docs-layout{display:block}.docs-main{padding:0}.legacy-content{font-size:11pt}a{text-decoration:none!important}}
/* Keep long tutorials consistent with the navigation, and hide the closed mobile drawer from keyboard focus. */
body.docs-page{font-family:Inter,"Segoe UI","Microsoft YaHei",sans-serif}
.docs-sidebar .search-open{position:sticky;top:0;z-index:2;box-shadow:0 0 0 8px #fbfcfa}
@media(max-width:800px){.docs-sidebar{visibility:hidden}.menu-open .docs-sidebar{visibility:visible}}
@media(max-width:600px){body:not(.docs-page) .top-nav a:first-child{display:none}body:not(.docs-page) .top-nav a:nth-child(2){display:block}}