@charset "UTF-8";
:root{--ink:#1c2331;--muted:#606979;--line:#dfe3eb;--blue:#2344cd;--paper:#fff;--tint:#f2f4fa;--serif:"Songti SC","Noto Serif CJK SC","Source Han Serif SC",serif;--sans:"Hiragino Sans GB","Microsoft YaHei",sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:2rem}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.75 var(--sans);-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}a:hover{color:var(--blue)}a:focus-visible,button:focus-visible,[tabindex]:focus-visible{outline:3px solid #ea702c;outline-offset:5px}::selection{background:#dce4ff}.skip{position:absolute;left:1rem;top:-10rem;background:var(--ink);color:white;padding:1rem;z-index:20}.skip:focus{top:1rem}.masthead{max-width:1240px;margin:auto;padding:28px 40px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);gap:20px}.brand{display:flex;align-items:center;gap:12px;font:700 24px var(--serif);white-space:nowrap}.brand-symbol{display:grid;place-items:center;width:34px;height:34px;background:var(--blue);color:white;font-size:22px}.brand-en{font:11px/1.3 Georgia,serif;letter-spacing:.13em;border-left:1px solid var(--line);padding-left:12px;color:var(--muted)}nav{display:flex;gap:30px;font-size:15px}nav a[aria-current]{color:var(--blue)}.intro{max-width:1240px;margin:auto;padding:78px 40px 70px;display:grid;grid-template-columns:1.15fr .85fr;gap:65px;align-items:center}.eyebrow{font-size:13px;letter-spacing:.04em;color:var(--blue);margin:0 0 20px}.eyebrow span{color:var(--muted);letter-spacing:0}h1,h2,h3,p{margin-top:0}h1{font:600 clamp(34px,4.2vw,54px)/1.35 var(--serif);letter-spacing:-.035em;margin-bottom:24px}.intro h1 span{color:var(--blue)}.lede{font-size:17px;line-height:1.95;color:var(--muted);margin-bottom:30px}.button{display:inline-flex;align-items:center;justify-content:center;gap:22px;background:var(--blue);color:white;padding:13px 22px;font-size:15px;border:1px solid var(--blue)}.button:hover{background:#172c91;color:white}.feature{background:var(--blue);color:white;padding:28px 34px 24px;position:relative}.feature-top{display:flex;justify-content:space-between;font-size:12px;letter-spacing:.1em;border-bottom:1px solid #ffffff4d;padding-bottom:15px;margin-bottom:26px}.feature h2{font:500 34px/1.45 var(--serif);margin-bottom:10px}.feature>p{color:#dce4ff;font-size:14px}.pipeline{list-style:none;margin:24px 0;padding:0}.pipeline li{display:flex;gap:22px;align-items:baseline;border-top:1px solid #ffffff38;padding:12px 0}.pipeline li>span{font:italic 22px Georgia,serif;color:#bfcfff}.pipeline small{display:block;font-size:12px;color:#dce4ff}.feature>a{display:flex;justify-content:space-between;font-size:14px;border-top:1px solid #ffffff4d;padding-top:16px}.feature>a:hover{color:white;text-decoration:underline}.reading-list,.listing{max-width:1160px;margin:0 auto;padding:0 0 45px}.section-title{display:flex;align-items:baseline;justify-content:space-between;border-bottom:2px solid var(--ink);padding-bottom:18px;gap:20px}.section-title h2{font:600 28px var(--serif);margin:0}.section-title>span{font-size:13px;color:var(--muted)}.post-row{display:grid;grid-template-columns:58px 1fr 80px;gap:22px;padding:30px 0;border-bottom:1px solid var(--line);align-items:start}.serial{font:italic 31px Georgia,serif;color:var(--blue);line-height:1.5}.post-row .eyebrow{margin:0 0 7px;font-size:12px}.post-row h3{font:600 25px/1.45 var(--serif);margin:0 0 8px}.post-row p{color:var(--muted);font-size:14px;max-width:790px;margin:0}.read-link{font-size:14px;margin-top:24px;text-align:right}.read-link span{margin-left:6px}.worksheet-band{max-width:1160px;margin:15px auto 80px;background:var(--tint);padding:35px 42px;display:grid;grid-template-columns:1fr 1.2fr;gap:30px;align-items:center}.worksheet-band .eyebrow{margin-bottom:10px}.worksheet-band h2{font:600 29px/1.5 var(--serif);margin:0}.worksheet-band p{font-size:15px;color:var(--muted)}.text-link{color:var(--blue);border-bottom:1px solid var(--blue);padding-bottom:4px;font-size:15px}.footer{max-width:1240px;margin:auto;padding:34px 40px;border-top:1px solid var(--line);display:flex;gap:30px;flex-wrap:wrap;align-items:center;justify-content:space-between}.footer-brand{font:600 22px var(--serif)}.footer p{font-size:13px;color:var(--muted);margin:8px 0 0}.footer nav{gap:20px;font-size:13px}.copyright{font-size:12px;color:var(--muted)}.listing{padding-top:65px;min-height:65vh}.listing h1{font-size:42px}.article-main{max-width:1160px;margin:0 auto;padding:30px 0 65px}.breadcrumb{display:flex;gap:12px;color:var(--muted);font-size:13px;margin-bottom:45px}.article-header{max-width:810px;margin:0 auto 42px}.article-header h1{font-size:44px}.article-header .eyebrow{margin-bottom:15px}.article-deck{color:var(--muted);font-size:18px;line-height:1.9}.article-meta{display:flex;flex-wrap:wrap;gap:22px;color:var(--muted);font-size:13px;padding-top:10px}.article-layout{display:grid;grid-template-columns:215px minmax(0,760px);gap:50px;align-items:start}.toc{position:sticky;top:25px;padding-right:10px}.toc>p{font-size:13px;color:var(--muted);margin-bottom:12px}.toc ul{list-style:none;padding:0;margin:0}.toc li{margin-bottom:10px;font-size:13px;line-height:1.7}.toc li a{display:block;border-left:2px solid var(--line);padding:2px 0 2px 14px}.toc li a:hover{border-color:var(--blue)}.prose{font-size:17px;line-height:1.95;min-width:0}.prose p{margin-bottom:22px}.prose h2{font:600 28px/1.5 var(--serif);margin:48px 0 18px;scroll-margin-top:30px}.prose>h2:first-child{margin-top:0}.prose a{color:var(--blue);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:4px}.prose .button{color:white;text-decoration:none}.prose blockquote{border-left:3px solid var(--blue);margin:26px 0;padding:17px 23px;background:var(--tint);font-size:16px}.prose blockquote p:last-child{margin-bottom:0}.prose code{font:14px/1.8 "SFMono-Regular",Consolas,monospace;background:var(--tint);padding:2px 5px;overflow-wrap:anywhere}.prose pre{background:#f2f4fa;padding:22px;overflow:auto;max-width:100%;border:1px solid var(--line)}.prose pre code{padding:0;white-space:pre;overflow-wrap:normal}.table-scroll{overflow-x:auto;max-width:100%;margin:25px 0}.prose table{width:100%;border-collapse:collapse;font-size:14px;line-height:1.8;min-width:480px}.prose th{text-align:left;background:var(--tint);font-weight:600}.prose th,.prose td{padding:12px 14px;border-bottom:1px solid var(--line);vertical-align:top}.editor-note{font-size:13px;line-height:1.8;color:var(--muted);padding:22px 0;border-top:1px solid var(--line);margin-top:40px}.related{max-width:900px;margin:60px auto 0}.related>h2{font:600 27px var(--serif)}.simple-page{max-width:840px;padding:65px 30px 80px;margin:auto;min-height:70vh}.simple-page h1{font-size:44px}.simple-page .article-deck{margin-bottom:40px}.resource{display:flex;gap:25px;border-top:1px solid var(--line);padding:28px 0}.resource h2{margin:0 0 10px;font-size:25px}.resource p{font-size:16px}.small{font-size:13px;color:var(--muted)}
@media(max-width:1239px){.reading-list,.listing,.article-main{margin-left:40px;margin-right:40px}.worksheet-band{margin-left:40px;margin-right:40px}.intro{gap:35px}.brand-en{display:none}.article-layout{gap:30px;grid-template-columns:190px minmax(0,1fr)}}
@media(max-width:760px){.masthead{padding:20px 22px}.brand{font-size:21px;gap:9px}.brand-symbol{width:30px;height:30px;font-size:20px}nav{gap:18px;font-size:14px}.intro{display:block;padding:45px 24px}.intro h1{font-size:38px}.intro .lede{font-size:16px}.feature{margin-top:38px;padding:24px}.feature h2{font-size:30px}.feature-top{margin-bottom:20px}.pipeline{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:20px 0}.pipeline li{display:block}.pipeline li>div{font-size:14px;margin-top:8px}.pipeline small{font-size:12px}.reading-list,.listing,.article-main{margin-left:24px;margin-right:24px}.section-title{display:block}.section-title h2{font-size:26px;margin-bottom:8px}.post-row{grid-template-columns:30px minmax(0,1fr);gap:14px;padding:25px 0}.serial{font-size:25px}.post-row h3{font-size:22px}.post-row p{font-size:14px}.read-link{grid-column:2;margin:0;text-align:left}.worksheet-band{margin:0 24px 45px;display:block;padding:27px}.worksheet-band h2{font-size:26px;margin-bottom:20px}.footer{padding:28px 24px;display:block}.footer nav{margin:24px 0 16px;flex-wrap:wrap}.listing{padding-top:42px}.listing h1{font-size:34px}.breadcrumb{margin-bottom:30px}.article-header h1{font-size:34px}.article-deck{font-size:17px}.article-layout{display:block}.toc{position:static;border-block:1px solid var(--line);padding:17px 0;margin-bottom:30px}.toc>p{margin-bottom:8px}.toc li{margin:5px 0;font-size:14px}.article-main{padding-top:23px}.prose{font-size:17px}.prose h2{font-size:25px;margin-top:36px}.prose blockquote{padding:16px;font-size:16px}.prose pre{padding:16px}.simple-page{padding:43px 24px}.simple-page h1{font-size:35px}.resource{gap:15px}.resource .button{font-size:14px;padding:11px 15px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}@media print{.masthead,.footer,.toc,.related,.skip{display:none}.article-layout{display:block}.article-main{margin:0;padding:0}.prose{font-size:12pt}.prose pre{white-space:pre-wrap}.article-header h1{font-size:26pt}}

.home-intro{max-width:1160px;margin:0 auto;padding:55px 0 38px}.home-intro h1{font-size:clamp(32px,4vw,48px);margin-bottom:14px}.home-intro .lede{max-width:720px;margin-bottom:24px}.category-links{display:flex;gap:12px;flex-wrap:wrap;margin:20px 0 30px}.category-links a{padding:6px 13px;border:1px solid var(--line);font-size:14px}.category-links span{color:var(--muted);margin-left:8px}.pagination{margin:30px 0}.pagination a{border:1px solid var(--line);padding:6px 16px}.prose img{max-width:100%;height:auto}.prose{overflow-wrap:anywhere}.post-row .eyebrow{font-size:13px}.toc .toc{position:static}.toc{max-height:85vh;overflow:auto}.brand-en{font-size:11px}.section-title>a{font-size:14px;color:var(--blue)}@media(max-width:1239px){.home-intro{margin:0 40px}}@media(max-width:760px){.home-intro{margin:0 24px;padding:32px 0 12px}.masthead{flex-wrap:wrap;gap:16px}.masthead nav{width:100%;justify-content:space-between}.toc{max-height:none}.section-title{display:flex}.section-title h2{font-size:24px}.article-header h1{font-size:30px}.category-links{gap:8px}.category-links a{padding:5px 10px}}

/* Field guide: numbered route, annotated diagrams and a local budget worksheet. */
.build-map{background:#f3f5ff;border:1px solid #c9d2ed;padding:24px;margin:28px 0 24px;border-top:4px solid #2344cd}
.map-heading{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:18px;font-weight:700}.map-heading small{font-weight:400;color:#525e75;font-size:13px}
.prose .build-map ol{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:1fr 1fr;gap:10px}.build-map li{margin:0;min-width:0}.build-map a{display:flex;align-items:flex-start;gap:10px;background:white;border:1px solid #dbe1ef;padding:14px;height:100%;box-sizing:border-box;text-decoration:none;color:#182b4a}.build-map a:hover{border-color:#2344cd;background:#edf1ff}.build-map b{font:26px Georgia,serif;color:#2344cd}.build-map a>span{flex:1;font-size:15px;line-height:1.55}.build-map small{display:block;font-size:12px;color:#566278;margin-top:4px}.build-map em{font-style:normal;font-size:11px;white-space:nowrap;color:#334ca3;background:#eef2ff;padding:2px 5px}.build-map .map-paid em{background:#fff0d5;color:#7b4400}.build-map .map-wait em{background:#e8f4ee;color:#206446}.prose .build-map p{font-size:14px;margin:18px 0 0}
.prose .guide-figure{margin:30px 0;padding:22px;border:1px solid #cbd4e0;background:#fafbf8}.guide-figure figcaption{font-size:13px;line-height:1.7;color:#58626a;border-top:1px solid #dce2e7;margin-top:18px;padding-top:12px}.mini-flow{display:flex;align-items:center;gap:12px}.mini-flow div{flex:1;min-width:0}.mini-flow strong,.mini-flow small,.mini-flow span{display:block}.mini-flow small{font-size:12px;color:#526483}.mini-flow strong{font-size:17px;margin:6px 0}.mini-flow span{font-size:13px;color:#56606a}.mini-flow i,.dns-pair i{font-style:normal;color:#2344cd;font-size:24px}
.home-sketch{max-width:510px;margin:auto;border:1px solid #b5c1d1;background:white;padding:20px}.sketch-header{display:flex;justify-content:space-between;gap:16px;font-size:14px;border-bottom:2px solid #2344cd;padding-bottom:12px}.sketch-header span{font-size:12px}.sketch-intro{padding:20px 0;font-family:Georgia,'Songti SC',serif;font-size:22px}.sketch-intro small,.sketch-post span{display:block;font:12px/1.7 sans-serif;color:#657187}.sketch-post{padding:14px 0;border-top:1px solid #dde3eb;font-size:15px}.sketch-post:first-of-type{color:#2344cd}
.dns-pair{display:grid;grid-template-columns:1fr 28px 1.4fr;align-items:center;gap:12px;padding:14px 0;border-top:1px solid #dae1e8}.dns-pair small,.dns-pair strong,.dns-pair span{display:block}.dns-pair small{font-size:12px;color:#5c6980}.dns-pair strong{font-size:15px}.dns-pair span{font-size:13px}.status-track{display:grid;gap:14px;border-left:2px solid #a7b7d8;margin-left:7px;padding-left:20px}.status-track div{position:relative}.status-track div:before{content:'';position:absolute;left:-26px;top:10px;width:10px;height:10px;background:#2344cd;border-radius:50%}.status-track b{font-size:15px}.status-track span{display:block;font-size:13px;color:#626a76}
.budget-box{background:#fff9ed;border:1px solid #e3c68d;padding:22px;margin:26px 0}.prose .budget-box p{font-size:14px}.budget-inputs{display:grid;grid-template-columns:1fr 1fr;gap:14px}.budget-inputs label{font-size:13px}.budget-inputs input{display:block;width:100%;box-sizing:border-box;border:1px solid #bcad93;background:white;padding:10px;font:16px inherit;margin-top:6px}.budget-box output{display:block;font-size:15px;margin-top:18px}.prose details{border-top:1px solid #d5dce5;border-bottom:1px solid #d5dce5;padding:14px 0;margin:20px 0}.prose summary{cursor:pointer;color:#2344a0;font-weight:600;font-size:15px}.prose details p{font-size:15px} .prose span[id]{scroll-margin-top:30px} .build-map a:focus-visible,.budget-inputs input:focus-visible,summary:focus-visible{outline:3px solid #2344cd;outline-offset:3px}
@media(max-width:650px){.prose .build-map ol{grid-template-columns:1fr}.build-map{padding:16px}.build-map li+li:before{content:'↓';display:block;color:#6a78a0;line-height:16px;margin:0 0 8px 14px}.build-map a{height:auto}.prose .guide-figure{padding:16px}.dns-pair{grid-template-columns:1fr;gap:4px}.dns-pair i{transform:rotate(90deg);width:24px}.mini-flow{align-items:stretch;flex-direction:column}.mini-flow i{transform:rotate(90deg);width:24px}.budget-box{padding:16px}.budget-inputs{gap:10px}.sketch-header{flex-direction:column;gap:4px}}

.guide-intro{max-width:960px;margin:0 auto 36px}.guide-intro .build-map{margin-bottom:0}.budget-inputs input{font-family:inherit;font-size:16px}
nav.build-map{display:block}.build-map b{flex:0 0 34px;white-space:nowrap}.build-map .map-heading{display:block}.build-map .map-heading small{margin-top:5px}

.sample-pages,.comparison{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:24px 0}.prose .sample-page{background:#f8f4eb;border:1px solid #cabea7;margin:0;padding:24px;min-width:0}.sample-page small{font-size:12px;color:#755c3f;letter-spacing:.06em}.prose .sample-page h3{font:600 29px/1.45 var(--serif);margin:24px 0 18px;color:#382f22}.prose .sample-page p{font-size:16px;color:#635646}.folder-evidence{border-left:2px solid #98724b;padding-left:15px;margin:24px 0}.folder-evidence b,.folder-evidence span{display:block;font-size:15px}.file-lanes>div{border-top:1px solid #cbbda8;padding:14px 0}.file-lanes b,.file-lanes span{display:block;font-size:15px}.file-lanes span{font-size:13px;color:#655744}.sample-page figcaption{font-size:12px;color:#73644e;border-top:1px solid #cbbda8;padding-top:15px;margin-top:20px}.comparison>div{border:1px solid #cfd8e1;background:white;padding:20px;min-width:0}.comparison small{font-size:12px;color:#52637a}.prose .comparison h3{font:600 25px/1.45 var(--serif);margin:14px 0}.prose .comparison p{font-size:14px;margin:0}.comparison .compare-wrong{border-top:4px solid #a85e46}.comparison .compare-right{border-top:4px solid #317250}.comparison{margin:0}.guide-figure .comparison{margin-top:10px}@media(max-width:650px){.sample-pages,.comparison{grid-template-columns:1fr}.prose .sample-page h3{font-size:29px}.sample-page{min-height:420px}}