:root{--paper:#fff;--ink:#153d34;--accent:#13766a;--muted:#62736c;--line:#dce5df;--wash:#f5f7f6;--result:#e5f3ef;--danger:#8a3929;--radius:6px;font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--paper);font-size:18px;line-height:1.8}
*{box-sizing:border-box}body{margin:0}a{color:var(--accent);text-underline-offset:4px}a:hover{text-decoration:underline}button,input,select,textarea{font:inherit}button,a,input,textarea,summary{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:default;opacity:.55}input[type=checkbox]{accent-color:var(--accent);width:18px;height:18px;flex:0 0 18px}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #5ba89c;outline-offset:4px}h1,h2,h3{line-height:1.35;letter-spacing:-.025em}h1{font-size:56px;margin:0 0 12px}h2{font-size:32px;margin:0 0 18px}h3{font-size:23px;margin:0 0 8px}p{margin:0 0 18px}ul,ol{padding-left:1.4em;margin:0 0 20px}small{font-size:15px;color:var(--muted)}[hidden]{display:none!important}.wrap{width:min(1360px,calc(100% - 96px));margin-inline:auto}.skip-link{position:absolute;left:16px;top:-80px;z-index:30;background:white;padding:8px 16px}.skip-link:focus{top:8px}.learning-header{border-bottom:1px solid var(--line);background:var(--paper)}.header-inner{min-height:90px;display:flex;align-items:center;justify-content:space-between;gap:30px}.learning-brand{font-size:30px;font-weight:750;color:var(--ink);text-decoration:none;white-space:nowrap}.learning-nav{display:flex;gap:44px;align-items:center;font-size:18px}.learning-nav a{color:var(--muted);text-decoration:none}.learning-nav a:hover{color:var(--accent)}.button{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--accent);border:1px solid var(--accent);border-radius:var(--radius);padding:11px 24px;color:white;font-size:17px;line-height:1.5;text-decoration:none;font-weight:550}.button:hover{background:#0d655b;text-decoration:none}.button.secondary{background:white;color:var(--accent)}.button.secondary:hover{background:var(--result)}.text-link{display:inline-flex;gap:10px;align-items:center;font-weight:550;text-decoration:none}.arrow-icon{width:20px;height:20px;vertical-align:middle;flex-shrink:0}.actions{display:flex;gap:14px;align-items:center;flex-wrap:wrap}.muted{color:var(--muted)}.section{padding-block:70px}.hero{padding-block:90px 70px;display:grid;grid-template-columns:minmax(0,1.55fr) minmax(290px,.75fr);gap:90px;align-items:center}.hero h1{font-size:76px;line-height:1.3;letter-spacing:-.045em;margin-bottom:25px}.hero .lede{font-size:25px;line-height:1.7;max-width:810px;color:var(--muted);margin-bottom:35px}.hero .actions{gap:38px}.hero .button{padding:17px 34px;font-size:21px}.hero .text-link{font-size:21px}.learning-rail{list-style:none;counter-reset:step;margin:0;padding:0}.learning-rail li{display:grid;grid-template-columns:50px 1fr;gap:18px;position:relative;padding-block:12px 40px}.learning-rail li:last-child{padding-bottom:12px}.learning-rail li:before{content:counter(step,decimal-leading-zero);counter-increment:step;font-size:32px;font-weight:650;color:var(--accent);line-height:1.3}.learning-rail .rail-copy{border-left:2px solid #cce0db;padding-left:28px}.rail-copy strong{font-size:24px;line-height:1.4;display:block;margin-bottom:8px}.rail-copy p{color:var(--muted);font-size:19px;margin:0}.continue-band{background:var(--wash);padding-block:38px}.continue-band h2{font-size:30px;margin-bottom:10px}.continue-band p{color:var(--muted);margin-bottom:20px}.section-intro{display:flex;align-items:center;justify-content:space-between;gap:24px;margin-bottom:16px}.section-intro h2{margin:0}.directory-description{color:var(--muted);margin-bottom:24px}.search-box{display:flex;align-items:center;gap:10px;border:1px solid #bdcec6;border-radius:5px;padding:9px 14px;background:white}.search-box svg{width:22px;height:22px;color:var(--muted);flex-shrink:0}.search-box input{border:0;background:transparent;outline:none;width:100%;font-size:17px;min-width:180px}.search-box:focus-within{outline:2px solid var(--accent);outline-offset:2px}.course-filters{display:flex;gap:32px;border-bottom:1px solid var(--line);margin:22px 0 28px;flex-wrap:wrap}.course-filters button{border:0;border-bottom:3px solid transparent;color:var(--muted);background:transparent;padding:8px 2px 11px;font-size:18px}.course-filters button[aria-pressed=true]{color:var(--accent);border-bottom-color:var(--accent);font-weight:650}.directory-columns,.course-row{display:grid;grid-template-columns:1fr 1.25fr 1.1fr 130px;gap:30px;align-items:center}.directory-columns{font-size:15px;color:var(--muted);font-weight:650;padding:0 0 13px;border-bottom:1px solid var(--line)}.course-group h3{font-size:24px;margin:28px 0 0;padding-bottom:12px;border-bottom:1px solid var(--line)}.course-row{padding:20px 0;border-bottom:1px solid var(--line);font-size:17px}.course-row h4{font-size:21px;line-height:1.4;margin:0;font-weight:600}.course-row h4 a{color:var(--ink);text-decoration:none}.course-row p{margin:0;color:var(--muted)}.course-row .text-link{font-size:16px;justify-self:end;white-space:nowrap}.no-results{background:var(--wash);padding:22px}.records-heading{display:flex;align-items:start;justify-content:space-between;gap:24px;margin-bottom:40px}.records-heading h2{font-size:42px;margin-bottom:14px}.records-heading p{color:var(--muted);margin:0}.empty-records{background:var(--wash);padding:34px;border-radius:5px}.empty-records h3{font-size:25px}.empty-records p{color:var(--muted)}.record-row{display:grid;grid-template-columns:1fr 1.2fr auto;gap:24px;padding:22px 0;border-bottom:1px solid var(--line);align-items:center}.record-row h3{font-size:23px}.record-row p{font-size:16px;margin:0;color:var(--muted)}.record-row button{font-size:15px;border:0;color:var(--muted);background:transparent;padding:8px}.record-row .record-actions{display:flex;gap:20px;align-items:center}.method-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:60px}.method-grid .number{color:var(--accent);font-size:48px;line-height:1.4}.method-grid h3{font-size:26px;margin-block:10px}.method-grid p{color:var(--muted);margin:0}.learning-footer{padding-block:30px 42px;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:28px;color:var(--muted);font-size:15px}.learning-footer strong{font-size:22px;color:var(--ink);white-space:nowrap}.learning-footer .footer-copy{display:flex;gap:28px;align-items:center}.learning-footer nav{display:flex;gap:24px;white-space:nowrap}.backup-panel{margin-top:24px;border-top:1px solid var(--line);padding-top:22px}.backup-panel label{display:block;font-weight:600}.backup-panel textarea,.stage-record textarea{width:100%;border:1px solid #b6cbc2;border-radius:5px;padding:12px 14px;background:white;color:var(--ink);line-height:1.7;resize:vertical;font-size:16px}.status{font-size:15px;line-height:1.7;color:var(--muted);margin-top:12px}.status.error{color:var(--danger)}.breadcrumb{font-size:15px;color:var(--muted);margin:24px 0}.breadcrumb a{color:var(--muted)}.guide-heading{display:flex;align-items:center;justify-content:space-between;gap:40px;margin-bottom:34px}.guide-heading .lede{font-size:24px;line-height:1.7;color:var(--muted);max-width:890px;margin:0}.guide-heading .button{white-space:nowrap}.guide-prereqs{display:grid;grid-template-columns:1fr 1fr;gap:40px;margin-bottom:20px}.guide-prereqs>div+div{border-left:1px solid var(--line);padding-left:40px}.guide-prereqs h2{font-size:24px;margin:0 0 12px}.guide-prereqs ul{color:var(--muted);font-size:18px;margin-bottom:0}.scope-note{font-size:16px;color:var(--muted);border-bottom:1px solid var(--line);padding:12px 0 25px;margin-bottom:40px}.guide-layout{display:grid;grid-template-columns:minmax(0,1fr) 340px;gap:34px;align-items:start;padding-bottom:65px}.guide-sidebar{background:var(--wash);padding:30px;border-radius:5px;position:sticky;top:24px}.guide-sidebar h2{font-size:25px;margin-bottom:12px}.guide-sidebar h3{font-size:22px}.guide-sidebar .button{width:100%;margin:6px 0 12px;font-size:17px;padding-inline:14px}.guide-sidebar p{font-size:16px;color:var(--muted)}.guide-sidebar section+section{border-top:1px solid var(--line);padding-top:25px;margin-top:24px}.guide-sidebar a{word-break:break-word}.guide-sidebar .resource{display:block;margin-bottom:17px;line-height:1.5}.resource small{display:block;margin-top:5px}.path-title{font-size:31px;margin-bottom:22px}.stage{display:grid;grid-template-columns:44px minmax(0,1fr);gap:18px;position:relative;padding-bottom:25px;scroll-margin-top:25px}.stage:before{content:"";position:absolute;left:21px;top:0;bottom:0;width:2px;background:var(--line);z-index:-1}.stage:last-child:before{bottom:calc(100% - 44px)}.stage-number{display:flex;width:44px;height:44px;border:1px solid var(--line);border-radius:50%;background:var(--wash);align-items:center;justify-content:center;font-size:17px}.stage-body{padding:20px 24px;border:1px solid var(--line);border-radius:4px;background:white}.stage-body h3{font-size:23px;margin-bottom:9px}.stage-body .stage-goal{color:var(--muted);margin:0 0 15px;font-size:17px}.stage-links{display:flex;gap:12px 28px;flex-wrap:wrap;font-size:17px;line-height:1.6;margin-bottom:15px}.stage-links a{display:inline-flex;align-items:center;gap:5px;text-decoration:none}.stage-deliverable{font-size:16px;margin-bottom:13px;color:var(--muted)}.stage-state{font-size:14px;display:inline-block;color:var(--accent);margin-bottom:8px;min-height:22px}.stage-record{border-top:1px solid var(--line);padding-top:10px;font-size:16px}.stage-record summary{cursor:pointer;color:var(--accent);font-weight:550}.record-fields{padding-top:16px}.record-fields .record-flags{display:flex;gap:20px;flex-wrap:wrap;margin-bottom:14px}.record-fields label{display:flex;gap:9px;align-items:start;line-height:1.65}.record-fields input[type=checkbox]{margin-top:4px}.record-fields fieldset{border:0;padding:14px 0 8px;margin:0}.record-fields legend{font-weight:600}.record-fields fieldset label{margin-bottom:9px}.record-fields .note-label{display:block;margin-bottom:8px}.record-fields .note-label small{display:block;font-weight:400}.part-heading{font-size:20px;color:var(--muted);margin:12px 0 20px 62px}.guide-bottom{margin:10px 0 0 62px;border-top:1px solid var(--line);padding-top:25px}.guide-bottom h2{font-size:25px}.guide-bottom p{color:var(--muted);font-size:16px}.reference-notice{background:var(--wash);border-left:3px solid var(--accent);padding:16px 20px;margin:25px 0;color:var(--muted)}.version-table{width:100%;border-collapse:collapse;font-size:17px}.version-table th,.version-table td{text-align:left;border-bottom:1px solid var(--line);vertical-align:top;padding:18px 22px 18px 0}.version-table th{color:var(--muted);font-size:16px}.version-table p{font-size:15px;color:var(--muted);margin:7px 0}.info-page{max-width:920px;padding-bottom:70px}.info-page h2{font-size:28px;margin-top:40px}.info-page .lede{font-size:23px;color:var(--muted)}.course-case>header,.course-case>footer{max-width:1100px;margin:auto;padding:24px 40px;color:var(--muted);font-size:16px}.course-case>header{border-bottom:1px solid var(--line)}.course-case main{max-width:1050px;margin:auto;padding:46px 40px 70px}.course-case h1{font-size:42px;margin-block:16px 30px;max-width:900px}.course-case h2{font-size:28px;margin:48px 0 20px}.course-case h3{font-size:23px;margin:30px 0 15px}.course-case p{margin-bottom:22px}.course-case table{width:100%;border-collapse:collapse;margin:24px 0;font-size:16px}.course-case th,.course-case td{border:1px solid var(--line);text-align:left;padding:12px 14px;vertical-align:top}.course-case th{background:var(--wash)}.course-case caption{color:var(--muted);text-align:left;margin-bottom:12px}.course-case pre{background:var(--wash);padding:20px 24px;overflow:auto;font-size:15px;line-height:1.75;border-left:3px solid #b9d4c9}.course-case code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:.88em}.course-case pre code{font-size:inherit}.course-case figure{margin:28px 0;overflow-x:auto}.course-case figure svg{width:100%;min-width:650px;display:block;height:auto}.course-case figcaption{color:var(--muted);font-size:16px;margin-top:14px}.course-case details{border-left:3px solid #b8d3c7;background:var(--wash);padding:18px 24px;margin:24px 0}.course-case details p:last-child{margin-bottom:0}.course-case details summary{cursor:pointer;font-weight:600;color:var(--accent)}.course-case details[open] summary{margin-bottom:18px}.course-case blockquote{border-left:3px solid var(--accent);padding:12px 22px;background:var(--wash);margin:24px 0}.course-case>footer{border-top:1px solid var(--line)}
.hero h1{font-size:84px;letter-spacing:-.03em;font-weight:750}.hero .lede{font-size:26px}.learning-brand{font-size:32px}.learning-rail{position:relative}.learning-rail:after{content:"";position:absolute;left:68px;top:12px;bottom:12px;width:2px;background:#cce0db}.learning-rail .rail-copy{border-left:0;position:relative;z-index:1}.continue-band{padding-block:42px}.continue-band h2{font-size:32px}.continue-band .button{font-size:19px;padding:13px 28px}.section-intro .search-box{width:450px}.course-row{padding-block:13px;font-size:18px;line-height:1.6}.directory-columns{font-size:16px}.course-group h3{font-size:26px}.guide-heading h1{font-size:60px}.course-case figure img{display:block;width:100%;height:auto}
@media(min-width:1500px){.wrap{width:min(1360px,calc(100% - 128px))}}
@media(max-width:1200px){.hero{gap:45px;padding-top:70px}.hero h1{font-size:62px}.hero .lede{font-size:22px}.learning-rail li{grid-template-columns:40px 1fr;gap:12px}.rail-copy strong{font-size:22px}.learning-rail .rail-copy{padding-left:20px}.guide-layout{grid-template-columns:minmax(0,1fr) 285px;gap:25px}.guide-sidebar{padding:24px}.directory-columns,.course-row{grid-template-columns:.85fr 1.2fr 1.1fr 110px;gap:20px}.hero .actions{gap:24px}.hero .button,.hero .text-link{font-size:18px}.hero .button{padding:14px 25px}}
@media(max-width:900px){.wrap{width:calc(100% - 48px)}.hero{grid-template-columns:1.3fr .8fr;gap:30px}.hero h1{font-size:48px}.hero .lede{font-size:20px}.rail-copy strong{font-size:20px}.rail-copy p{font-size:16px}.learning-rail li:before{font-size:24px}.learning-rail li{grid-template-columns:32px 1fr;padding-bottom:30px}.learning-nav{gap:26px;font-size:16px}.learning-brand{font-size:26px}.directory-columns,.course-row{grid-template-columns:1fr 1.5fr 110px;gap:20px}.directory-columns span:nth-child(3){display:none}.course-row>p:nth-child(3){grid-column:2;color:var(--muted);font-size:15px}.course-row>.text-link{grid-column:3;grid-row:1/3}.course-row{row-gap:4px;align-items:start}.course-row h4{grid-row:1/3}.section{padding-block:50px}.guide-layout{grid-template-columns:1fr}.guide-sidebar{position:static;display:grid;grid-template-columns:1fr 1fr;gap:24px}.guide-sidebar section+section{margin:0;padding:0;border:0}.guide-sidebar section:nth-child(3){grid-column:1/-1;border-top:1px solid var(--line);padding-top:20px}.guide-heading h1{font-size:46px}.guide-heading .lede{font-size:22px}.method-grid{gap:28px}.learning-footer,.learning-footer .footer-copy{flex-wrap:wrap}.record-row{grid-template-columns:1fr auto}.record-row>p{grid-column:1}.record-row .record-actions{grid-column:2;grid-row:1/3}.records-heading h2{font-size:36px}.guide-prereqs{gap:24px}.guide-prereqs>div+div{padding-left:24px}}
@media(max-width:640px){:root{font-size:17px}.wrap{width:calc(100% - 36px)}.header-inner{min-height:92px;align-items:start;flex-direction:column;justify-content:center;gap:5px;padding-block:12px}.learning-brand{font-size:24px}.learning-nav{gap:24px;font-size:15px}.hero{grid-template-columns:1fr;padding-block:45px 38px;gap:38px}.hero h1{font-size:43px;line-height:1.3;margin-bottom:20px}.hero .lede{font-size:19px;margin-bottom:25px}.hero .button{padding:12px 17px;font-size:17px}.hero .text-link{font-size:17px}.hero .actions{gap:22px}.learning-rail{display:grid;gap:14px}.learning-rail li{padding:0;grid-template-columns:34px 1fr;gap:12px}.learning-rail li:before{font-size:23px}.learning-rail .rail-copy{border-left:1px solid #cce0db;padding-left:14px}.rail-copy strong{font-size:18px;display:inline;margin-right:9px}.rail-copy p{display:inline;font-size:15px}.continue-band{padding-block:28px}.continue-band h2{font-size:25px}.continue-band p{font-size:16px}.section{padding-block:38px}.section-intro{flex-direction:column;align-items:stretch;gap:16px}.section-intro h2{font-size:29px}.search-box{padding:8px 12px}.search-box input{font-size:16px;min-width:0}.directory-description{font-size:16px;margin-bottom:14px}.course-filters{gap:16px;margin-block:16px 18px}.course-filters button{font-size:15px}.directory-columns{display:none}.course-group h3{font-size:21px;margin-top:25px}.course-row{display:block;padding:17px 0}.course-row h4{font-size:22px;margin-bottom:7px}.course-row p{font-size:16px;margin-bottom:3px}.course-row>p:nth-child(3){font-size:15px}.course-row>p:nth-child(3):before{content:"练习："}.course-row .text-link{margin-top:9px;font-size:16px}.records-heading{display:block;margin-bottom:22px}.records-heading h2{font-size:30px}.records-heading p{font-size:16px}.records-heading .actions{margin-top:19px}.button{font-size:16px;padding:10px 18px}.empty-records{padding:24px 20px}.empty-records h3{font-size:22px}.empty-records p{font-size:16px}.record-row{display:block}.record-row .record-actions{margin-top:15px;justify-content:space-between}.method-grid{grid-template-columns:1fr;gap:28px}.method-grid .number{font-size:33px}.method-grid h3{font-size:23px;display:inline-block;margin-left:18px}.method-grid p{font-size:16px;margin-top:6px}.learning-footer{padding-block:24px;gap:18px}.learning-footer .footer-copy{gap:10px;display:block}.learning-footer .footer-copy strong{display:block;margin-bottom:10px}.learning-footer nav{gap:22px}.breadcrumb{margin:20px 0;font-size:14px}.guide-heading{display:block;margin-bottom:25px}.guide-heading h1{font-size:39px}.guide-heading .lede{font-size:20px;margin-bottom:20px}.guide-prereqs{grid-template-columns:1fr;gap:24px}.guide-prereqs>div+div{border:0;padding:0}.guide-prereqs h2{font-size:23px}.guide-prereqs ul{font-size:16px}.scope-note{font-size:15px;margin-bottom:30px}.guide-layout{gap:20px}.path-title{font-size:28px}.stage{grid-template-columns:30px minmax(0,1fr);gap:10px;padding-bottom:20px}.stage:before{left:14px}.stage-number{width:30px;height:30px;font-size:14px}.stage-body{padding:16px 16px 13px}.stage-body h3{font-size:21px}.stage-body .stage-goal,.stage-links{font-size:16px}.stage-links{display:grid;gap:10px}.stage-deliverable{font-size:15px}.part-heading,.guide-bottom{margin-left:40px}.record-fields .record-flags{display:grid;gap:10px}.guide-sidebar{display:block;padding:24px}.guide-sidebar section+section{border-top:1px solid var(--line);padding-top:24px;margin-top:24px}.guide-prereqs{margin-bottom:16px}.version-table,.version-table tbody,.version-table tr,.version-table td{display:block}.version-table thead{display:none}.version-table td{border:0;padding:8px 0}.version-table tr{border-bottom:1px solid var(--line);padding:16px 0}.info-page h1{font-size:37px}.info-page .lede{font-size:20px}.info-page h2{font-size:25px}.course-case>header,.course-case>footer{padding:20px 18px}.course-case main{padding:28px 18px 50px}.course-case h1{font-size:32px}.course-case h2{font-size:25px;margin-top:36px}.course-case th,.course-case td{padding:8px;font-size:14px}.course-case table{display:block;overflow-x:auto}.course-case details{padding:15px 18px}.course-case pre{padding:16px;font-size:14px}.course-case figcaption{font-size:15px}.course-case figure svg{min-width:650px}.learning-footer nav{flex-wrap:wrap}}
@media(max-width:1200px){.learning-rail:after{left:52px}}
@media(max-width:900px){.learning-rail:after{left:44px}.section-intro .search-box{width:360px}}
@media(max-width:640px){.learning-rail:after{display:none}.learning-rail .rail-copy{border-left:1px solid #cce0db}.section-intro .search-box{width:100%}}
.learning-header{position:sticky;top:0;z-index:20}#courses,#records,#method{scroll-margin-top:110px}.stage{scroll-margin-top:125px}.learning-nav a[aria-current]{color:var(--accent);text-decoration:underline;text-underline-offset:10px;text-decoration-thickness:2px}.course-case p,.course-case td,.course-case th,.course-case a{overflow-wrap:anywhere}
@media(min-width:901px){#courses,#records,#method{scroll-margin-top:40px}.section-intro h2{font-size:42px}.course-row{padding-block:8px}.course-row h4{font-size:20px;font-weight:500}.course-group h3{margin-top:24px;padding-bottom:9px}}
