:root{--ink:#202833;--muted:#69727d;--line:#e2e5e9;--accent:#284e75;--soft:#f6f7f8;--negative:#a33d36}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:92px}
body{margin:0;background:#fff;color:var(--ink);font:16px/1.9 -apple-system,BlinkMacSystemFont,"Segoe UI","Microsoft YaHei","PingFang SC",sans-serif;-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none;text-underline-offset:4px;overflow-wrap:anywhere}
a:hover{text-decoration:underline}
button,input,summary{font:inherit}
button,a,input,summary{-webkit-tap-highlight-color:transparent}
button{cursor:pointer}
button:focus-visible,a:focus-visible,summary:focus-visible{outline:2px solid var(--accent);outline-offset:4px}
[hidden]{display:none!important}
.skip-link{position:fixed;top:-100px;left:20px;background:white;padding:8px 14px;z-index:20}
.skip-link:focus{top:8px}
#progress{position:fixed;top:0;left:0;height:2px;background:var(--accent);z-index:10;width:0}
.site-header{height:64px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 40px;background:#fff}
.brand{font-size:13px;letter-spacing:1.5px;font-weight:650;color:var(--ink)}
.brand span{font-size:12px;color:var(--muted);font-weight:400;letter-spacing:.5px;margin-left:12px}
.header-actions{display:flex;align-items:center;gap:22px;font-size:12px}
.header-actions button,.document-footer button{border:0;background:transparent;padding:8px 0;color:var(--muted)}
.header-actions a{color:var(--muted)}
.page-layout{max-width:1330px;margin:auto;padding:44px 40px 72px;display:grid;grid-template-columns:205px minmax(0,890px);gap:70px}
.sidebar{position:sticky;top:24px;align-self:start;max-height:calc(100vh - 48px);overflow-y:auto;scrollbar-width:thin;font-size:12px}
.contents-label{color:var(--muted);font-size:11px;letter-spacing:1px}
.sidebar nav{margin-top:12px}
.nav-group{display:block;color:#848c95;font-size:11px;margin:18px 0 6px}
.sidebar nav a{display:flex;gap:12px;padding:5px 10px 5px 0;color:var(--muted);line-height:1.65}
.sidebar nav a span{color:#9aa0a7;font-variant-numeric:tabular-nums;font-size:11px;width:18px;flex-shrink:0}
.sidebar nav a.active{color:var(--accent);font-weight:600}
.sidebar nav a.active span{color:var(--accent)}
.sidebar-note{border-top:1px solid var(--line);margin:26px 14px 0 0;padding-top:14px;color:#848c95;font-size:11px}
main{min-width:0}
.mobile-nav{display:none}
.document-header{padding:8px 0 28px;border-bottom:1px solid var(--line)}
.eyebrow{font-size:11px;letter-spacing:1.1px;color:var(--accent);font-weight:500}
h1{font-size:40px;font-weight:600;letter-spacing:.2px;line-height:1.4;margin:19px 0}
.subtitle{font-size:16px;line-height:1.9;max-width:690px;color:var(--muted);margin:0 0 22px}
.document-meta{display:flex;flex-wrap:wrap;gap:8px 22px;font-size:11px;color:var(--muted)}
.introduction{font-size:14px;color:var(--muted);margin:24px 0 42px}
.introduction p{margin:9px 0}
.report-section{margin:64px 0 0;scroll-margin-top:28px}
h2{border-top:1px solid var(--line);padding-top:24px;font-size:25px;line-height:1.5;font-weight:600;margin:0 0 26px;display:flex;gap:16px;align-items:baseline}
.section-number{font-size:13px;font-weight:500;color:var(--accent);font-variant-numeric:tabular-nums;flex-shrink:0;letter-spacing:.5px}
h3{font-size:19px;line-height:1.6;font-weight:600;margin:30px 0 13px}
h4{font-size:16px;font-weight:600;margin:24px 0 10px}
p{margin:14px 0;overflow-wrap:anywhere}
strong,b{font-weight:600}
ul,ol{padding-left:24px}
li{margin:7px 0;overflow-wrap:anywhere}
li p{margin:6px 0}
blockquote{margin:24px 0;padding:2px 0 2px 20px;border-left:2px solid #9fadb9;color:#48535f}
blockquote p{margin:9px 0}
code{font:0.86em/1.7 Consolas,"SFMono-Regular",monospace;background:var(--soft);padding:2px 4px;overflow-wrap:anywhere}
pre{padding:18px;background:var(--soft);overflow:auto;white-space:pre-wrap;border:1px solid var(--line)}
pre code{padding:0;background:transparent}
hr{height:1px;border:0;background:var(--line);margin:32px 0}
.table-wrap{overflow-x:auto;margin:24px 0;scrollbar-width:thin}
table{border-collapse:collapse;width:100%;min-width:570px;font-size:13px;line-height:1.8;text-align:left}
th{background:var(--soft);font-size:12px;font-weight:600;padding:11px 13px;border-top:1px solid var(--line);border-bottom:1px solid var(--line);vertical-align:top}
td{padding:13px;border-bottom:1px solid var(--line);vertical-align:top;overflow-wrap:anywhere}
td:first-child{font-weight:500}
td code{font-size:11px}
.cell-value{display:block;min-width:0}
.calculator{margin:32px 0;border-top:1px solid #bfc8d1;border-bottom:1px solid var(--line);padding:22px 0 16px}
.calc-header{display:flex;align-items:center;justify-content:space-between;gap:18px}
.calc-header h3{margin:6px 0 0;font-size:20px}
.quiet,.presets button{border:1px solid #cfd5dc;background:white;color:var(--ink);font-size:12px;padding:7px 12px;white-space:nowrap;border-radius:3px}
.quiet:hover,.presets button:hover{border-color:var(--accent);color:var(--accent)}
.calc-note,.calc-foot{color:var(--muted);font-size:12px}
.calc-foot{border-top:1px solid var(--line);padding-top:14px;margin-top:22px}
.presets{display:flex;gap:8px;margin:18px 0}
.calc-layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:30px;margin-top:22px}
.inputs{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px 12px;align-content:start}
.inputs label{font-size:11px;line-height:1.6;display:flex;flex-direction:column;gap:7px;color:#55616d}
.inputs input{width:100%;min-width:0;padding:7px 9px;background:white;border:1px solid #cbd1d8;border-radius:3px;color:var(--ink);font-size:15px;line-height:1.4}
.inputs input:focus{outline:2px solid #aebfcf;outline-offset:1px}
.inputs label small{color:var(--muted);font-size:10px}
.results{border-left:1px solid var(--line);padding-left:28px;min-width:0}
.result-caption{display:block;color:var(--muted);font-size:11px;line-height:1.8}
.result-main{display:block;font-size:36px;font-weight:500;line-height:1.5;color:var(--accent);margin:8px 0 20px;overflow-wrap:anywhere;font-variant-numeric:tabular-nums}
.negative{color:var(--negative)!important}
.result-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.result-grid div span{display:block;color:var(--muted);font-size:11px;line-height:1.6}
.result-grid b{display:block;font-size:16px;font-weight:500;line-height:1.8;overflow-wrap:anywhere}
.mini-insight,.risk-callout{font-size:12px;color:#55616d;line-height:1.9;margin:20px 0}
.risk-callout{border-top:1px solid var(--line);padding-top:14px}
.risk-callout small{font-size:11px;color:var(--muted)}
.chart{margin-top:22px;border-top:1px solid var(--line);padding-top:15px}
.bar-row{display:grid;grid-template-columns:28px minmax(0,1fr) 66px;align-items:center;gap:10px;font-size:11px;margin:13px 0}
.bar-row b{text-align:right;font-weight:500}
.bar-track{height:4px;background:#eff1f3}
.bar{height:4px;background:#64829f}
.bar.negative{background:#b8847f}
.validation{padding:16px 0;color:var(--negative);font-size:13px}
.ops-map{margin:30px 0 36px;padding:22px 0 0;border-top:1px solid #bfc8d1}
.ops-map figcaption h3{margin:8px 0 10px;font-size:21px}
.ops-map figcaption p{font-size:13px;color:var(--muted)}
.ops-legend{display:flex;flex-wrap:wrap;gap:8px 23px;margin:18px 0 23px;font-size:11px;color:var(--muted)}
.ops-legend span:before{content:"—";color:#9da7b1;margin-right:7px}
.ops-head,.ops-row{display:grid;grid-template-columns:118px minmax(0,1fr) minmax(0,1.1fr);gap:20px}
.ops-head{font-size:11px;color:var(--muted);padding-bottom:12px;border-bottom:1px solid var(--line)}
.ops-stages{padding:0;margin:0;list-style:none}
.ops-row{padding:22px 0;margin:0;border-bottom:1px solid var(--line)}
.ops-number{font-size:11px;color:#8b939c;display:block;font-variant-numeric:tabular-nums}
.ops-stage strong{font-size:16px;display:block;margin:5px 0 8px}
.ops-stage small{display:block;font-size:10px;color:var(--muted);line-height:1.7}
.ops-label{font-size:10px;display:block;color:var(--accent);line-height:1.7;margin-bottom:9px}
.ops-cc.support .ops-label{color:var(--muted)}
.ops-owner b,.ops-cc b{font-size:13px;font-weight:500;line-height:1.85;display:block}
.ops-owner p,.ops-cc p{font-size:12px;color:var(--muted);line-height:1.85;margin:8px 0}
.ops-cc small{font-size:11px;line-height:1.8;display:block;color:#546271}
.ops-loop{margin:16px 0 24px;font-size:12px;color:var(--accent)}
.ops-routes{display:grid;grid-template-columns:1fr 1fr;gap:28px}
.ops-routes div{border-top:1px solid var(--line);padding-top:13px}
.ops-routes strong{display:block;font-size:12px;margin-bottom:5px}
.ops-routes p{font-size:11px;color:var(--muted);margin:6px 0}
.ops-boundary{font-size:12px!important;color:var(--muted);border-top:1px solid var(--line);padding-top:16px}
.document-footer{border-top:1px solid var(--line);margin-top:60px;padding-top:18px;font-size:11px;color:var(--muted)}
.document-footer div{display:flex;align-items:center;flex-wrap:wrap;gap:10px 26px}
.document-footer button{font-size:11px}
.nojs{border-left:2px solid var(--accent);padding-left:15px;color:var(--muted);font-size:13px}
@media screen and (max-width:1100px){.page-layout{grid-template-columns:185px minmax(0,1fr);gap:34px;padding:32px}.site-header{padding:0 32px}h1{font-size:35px}.ops-head,.ops-row{grid-template-columns:95px minmax(0,1fr) minmax(0,1.1fr);gap:13px}.calc-layout{gap:20px}.results{padding-left:20px}}
@media screen and (max-width:760px){
  html{scroll-padding-top:64px}
  .site-header{height:56px;padding:0 21px}.brand{font-size:12px;letter-spacing:1px}.brand span{display:none}.header-actions{gap:17px;font-size:11px}
  .page-layout{display:block;padding:0 21px 40px}.sidebar{display:none}
  .mobile-nav{display:block;position:sticky;top:0;z-index:5;background:#fff;border-bottom:1px solid var(--line);margin-bottom:30px;font-size:13px}
  .mobile-nav summary{cursor:pointer;min-height:48px;align-content:center;padding:12px 0;color:#465260}
  .mobile-nav summary>span{float:right;font-size:11px;color:var(--muted);padding-right:3px}
  .mobile-nav nav{display:grid;grid-template-columns:1fr 1fr;gap:0 14px;max-height:65vh;overflow-y:auto;padding:0 0 20px}
  .mobile-nav .nav-group{grid-column:1 / -1;margin-top:16px}
  .mobile-nav a{display:flex;align-items:baseline;gap:7px;min-height:40px;padding:8px 0;font-size:12px;line-height:1.6;color:#455361}
  .mobile-nav a>span{color:#9299a1;font-size:10px}
  .document-header{padding:0 0 25px}
  h1{font-size:32px;margin:16px 0 20px;line-height:1.5}
  .subtitle{font-size:14px;line-height:1.95;margin-bottom:23px}
  .document-meta{font-size:10px;gap:6px 15px}
  .introduction{font-size:13px;line-height:1.9;margin:24px 0 32px}
  .report-section{margin-top:46px;scroll-margin-top:0}
  h2{font-size:22px;gap:12px;line-height:1.55;padding-top:22px;margin-bottom:23px}.section-number{font-size:12px}
  h3{font-size:18px;margin-top:27px}h4{font-size:16px}p{line-height:1.95}
  blockquote{padding-left:15px;margin:20px 0}ul,ol{padding-left:22px}
  .table-wrap{overflow:visible;margin:24px 0}
  table{min-width:0;display:block;width:100%;font-size:14px;border-top:1px solid var(--line)}
  thead{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);clip-path:inset(50%);white-space:nowrap}
  tbody{display:block}tr{display:block;padding:16px 0;border-bottom:1px solid var(--line)}
  td{display:grid;grid-template-columns:82px minmax(0,1fr);gap:14px;width:100%;border:0;padding:7px 0;line-height:1.85}
  td:before{content:attr(data-label);color:var(--muted);font-size:11px;font-weight:400;line-height:1.85;padding-top:2px}
  td:first-child{font-weight:600}td code{font-size:12px}
  .calculator{margin:27px 0;padding-top:20px}
  .calc-header{align-items:flex-start;gap:12px}.calc-header h3{font-size:18px}.calc-header .eyebrow{font-size:10px;letter-spacing:0}
  .quiet{padding:7px 9px;font-size:11px}.calc-layout{grid-template-columns:1fr;gap:26px}
  .inputs{gap:17px 14px}.inputs label{font-size:12px}.inputs input{font-size:16px;min-height:43px;padding:8px 10px}
  .results{border-left:0;border-top:1px solid var(--line);padding:22px 0 0}
  .result-main{font-size:36px}.result-grid b{font-size:17px}.result-caption,.result-grid div span{font-size:12px}
  .mini-insight,.risk-callout{font-size:13px}.calc-note,.calc-foot{font-size:12px}
  .ops-map{margin:26px 0}.ops-map figcaption .eyebrow{font-size:9px;letter-spacing:.3px}
  .ops-map figcaption h3{font-size:19px}.ops-map figcaption p{font-size:13px}
  .ops-legend{font-size:10px;gap:6px 16px;margin:16px 0}.ops-head{display:none}
  .ops-row{display:block;padding:22px 0;border-top:1px solid var(--line);border-bottom:0}
  .ops-stage{display:flex;align-items:baseline;flex-wrap:wrap;column-gap:10px;margin-bottom:15px}
  .ops-number{font-size:11px}.ops-stage strong{font-size:17px;margin:0}.ops-stage small{font-size:11px;margin-left:auto}
  .ops-owner{margin-bottom:17px}.ops-label{font-size:11px;margin-bottom:5px}
  .ops-owner b,.ops-cc b{font-size:14px}.ops-owner p,.ops-cc p{font-size:13px;margin:5px 0}
  .ops-cc small{font-size:12px}.ops-loop{border-top:1px solid var(--line);padding-top:15px;font-size:12px}
  .ops-routes{grid-template-columns:1fr;gap:14px}.ops-routes strong{font-size:13px}.ops-routes p{font-size:12px}
  .document-footer{margin-top:44px;font-size:11px}
}
@media screen and (max-width:360px){.page-layout{padding-left:17px;padding-right:17px}.site-header{padding:0 17px}h1{font-size:28px}h2{font-size:21px}.header-actions{gap:12px}td{grid-template-columns:72px minmax(0,1fr);gap:12px}.ops-stage small{width:100%;margin-left:25px;margin-top:4px}.calc-header{flex-wrap:wrap}.calc-header .quiet{margin-left:auto}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
@media print{
  @page{size:A4;margin:15mm 13mm}
  body{font-size:10pt;line-height:1.7;color:#111}
  .site-header,.sidebar,.mobile-nav,#progress,.skip-link,button,.presets,.document-footer div{display:none!important}
  .page-layout{display:block;max-width:none;padding:0}.document-header{padding-top:0}
  h1{font-size:25pt}h2{font-size:17pt;break-after:avoid}h3{font-size:12pt;break-after:avoid}
  .report-section{margin-top:30px}.table-wrap{overflow:visible}table{min-width:0;font-size:9pt}thead{display:table-header-group}tr{break-inside:avoid}
  th,td{padding:7px 9px}.calc-layout{gap:20px}.inputs input{border:0;border-bottom:1px solid #ddd;padding:3px 0;background:transparent}
  .calculator{break-inside:auto}.result-main{font-size:24pt}.ops-row{break-inside:avoid}.ops-head,.ops-row{grid-template-columns:90px 1fr 1.1fr;gap:14px}
  .ops-owner b,.ops-cc b{font-size:9pt}.ops-owner p,.ops-cc p{font-size:8pt}.ops-cc small{font-size:8pt}
  a{color:inherit;text-decoration:none}.document-footer{margin-top:30px}.subtitle{font-size:11pt}
}