@charset "UTF-8";
:root{--sans:Arial,Helvetica,"PingFang SC","Microsoft YaHei",sans-serif}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:32px}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--sans);-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
a:hover{color:var(--mint)}
a:focus-visible,button:focus-visible,summary:focus-visible,textarea:focus-visible{outline:2px solid var(--mint);outline-offset:6px}
::selection{background:var(--mint);color:var(--bg)}
.skip-link{position:fixed;top:12px;inset-inline-start:20px;transform:translateY(-180%);background:var(--mint);color:var(--bg);padding:12px 20px;z-index:10}
.skip-link:focus{transform:translateY(0)}
.paper-header{position:relative;z-index:5;max-width:1248px;margin:auto;padding:0 48px;min-height:80px;display:flex;align-items:center;justify-content:space-between;gap:24px;border-bottom:1px solid var(--line)}
.paper-brand{display:flex;align-items:center;gap:11px;min-width:0;font-size:20px;letter-spacing:1px}
.paper-brand img{display:block}
.paper-brand img{flex-shrink:0}
.paper-tools{display:flex;align-items:center;gap:24px;flex-shrink:0}
.paper-nav{display:flex;gap:28px;color:var(--muted);font-size:12px}
.paper-nav a,.paper-nav button{display:inline-flex;align-items:center;gap:7px;min-height:44px}
.paper-nav button{border:0;padding:0;background:none;color:inherit;font:inherit;cursor:pointer;text-align:start}
.paper-nav button:hover{color:var(--mint)}
.paper-nav button[hidden],.paper-copy-manual[hidden]{display:none}
.paper-nav svg{flex-shrink:0}
.paper-nav .paper-social{align-self:center;justify-content:center;flex-shrink:0;width:32px;min-height:38px;border-radius:50%}
.paper-social:hover,.paper-social:focus-visible{color:var(--mint);background:var(--hover)}
.paper-sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.paper-copy-manual{margin-top:24px;color:var(--muted);font-size:13px;line-height:1.8}
.paper-copy-manual summary{cursor:pointer}
.paper-copy-manual textarea{display:block;width:100%;margin-top:14px;padding:16px;resize:vertical;border:1px solid var(--line);border-radius:6px;background:var(--bg);color:var(--text);font:13px/1.7 "SFMono-Regular",Consolas,monospace}
.paper-hero{max-width:1160px;margin:auto;padding:85px 48px 68px}
.paper-kicker{margin:0 0 28px;color:var(--muted);font-size:11px;line-height:1.8;letter-spacing:1px}
.paper-kicker span{margin:0 12px;color:var(--muted)}
h1{margin:0;font-size:clamp(30px,4vw,49px);line-height:1.45;letter-spacing:1px;font-weight:400;color:var(--mint);overflow-wrap:break-word}
.paper-values{margin:28px 0 0;font-size:12px;line-height:2;color:var(--muted);letter-spacing:1px}
.paper-values span{margin:0 12px;color:var(--mint)}
.paper-layout{display:grid;grid-template-columns:210px minmax(0,740px);gap:66px;max-width:1160px;margin:0 auto;padding:0 48px 56px;align-items:start}
.paper-sidebar{position:sticky;top:32px;max-height:calc(100svh - 64px);overflow:auto;scrollbar-width:thin;scrollbar-color:var(--scrollbar) transparent}
.paper-sidebar summary{padding:5px 0 18px;color:var(--muted);font-size:11px;letter-spacing:1px;cursor:pointer}
.paper-sidebar ol{list-style:none;padding:0;margin:0}
.paper-sidebar li{margin:0}
.paper-sidebar a{display:flex;align-items:baseline;gap:12px;padding:10px 0;font-size:12px;line-height:1.5;color:var(--muted)}
.paper-sidebar a:hover{color:var(--mint)}
.paper-sidebar a span{flex:0 0 20px;color:var(--number);font:10px/1.5 "SFMono-Regular",Consolas,monospace}
.paper-content{min-width:0}
.paper-section{padding:40px 0 44px;border-top:1px solid var(--line);scroll-margin-top:24px}
.paper-section h2{display:flex;align-items:baseline;gap:14px;font-size:23px;font-weight:400;line-height:1.5;letter-spacing:.3px;margin:0 0 28px}
.chapter-number{flex-shrink:0;color:var(--number);font:11px/1.5 "SFMono-Regular",Consolas,monospace}
.paper-section p{margin:0 0 22px;color:var(--body);font-size:16px;line-height:1.95;overflow-wrap:break-word}
.paper-section p:last-child{margin-bottom:0}
.paper-section strong{color:var(--mint);font-weight:500}
.paper-preface{padding-top:2px;border-top:0;padding-bottom:56px}
.paper-preface h2{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.paper-preface p:first-of-type{color:var(--text);font-size:18px}
.paper-footer{border-top:1px solid var(--line);padding-top:26px;display:flex;align-items:center;justify-content:space-between;gap:20px;font-size:11px;line-height:1.8;color:var(--muted)}
.paper-footer a{white-space:nowrap;padding-block:10px}
.paper-language-fallback{margin-top:24px;font-size:12px;color:var(--muted)}
.paper-language-fallback[hidden]{display:none}
.paper-language-fallback summary{cursor:pointer}
.paper-language-fallback nav{display:flex;flex-wrap:wrap;gap:14px;margin-top:16px}
html[dir=rtl] h1,html[dir=rtl] .paper-brand,html[dir=rtl] .paper-kicker,html[dir=rtl] .paper-values,html[dir=rtl] .paper-section h2,html[lang=hi] h1{letter-spacing:0}
html[dir=rtl] .chapter-number,html[dir=rtl] .paper-sidebar a span{unicode-bidi:isolate}
html[dir=rtl] .paper-section p{line-height:2}
html[lang=hi] .paper-section p{line-height:2.1}
@media(min-width:1400px){.paper-hero{padding-top:100px;padding-bottom:80px}}
@media(max-width:1100px){
 .paper-header{padding-block:12px;gap:8px 15px;flex-wrap:wrap}
 .paper-tools{display:contents}
 .paper-header .theme-control{margin-inline-start:auto}
 .paper-header .language-control{margin-inline-start:0}
 .paper-brand{max-width:calc(100% - 160px)}
 .paper-nav{order:3;flex-basis:100%;justify-content:flex-end;flex-wrap:wrap}
}
@media(max-width:960px){
 .paper-layout{grid-template-columns:170px minmax(0,1fr);gap:36px;padding-inline:32px}
 .paper-hero,.paper-header{padding-inline:32px}
 .paper-section h2{font-size:21px}
}
@media(max-width:700px){
 html{scroll-padding-top:20px}
 .paper-header{min-height:68px;padding:12px 22px;gap:8px 15px;flex-wrap:wrap}
 .paper-tools{display:contents}
 .paper-header .theme-control{margin-inline-start:auto}
 .paper-header .language-control{margin-inline-start:0}
 .paper-brand{font-size:17px;letter-spacing:1px;gap:8px}
 .paper-brand{max-width:calc(100% - 150px)}
 .paper-brand img{width:25px;height:25px}
 .paper-nav{order:3;flex-basis:100%;justify-content:flex-end;gap:20px;font-size:11px;flex-wrap:wrap}
 .paper-nav a,.paper-nav button{min-height:32px}
 .paper-nav .paper-social{width:28px;min-height:34px}
 .paper-header .language-trigger{min-height:34px;font-size:10px;padding-inline:10px}
 .paper-hero{padding:50px 22px 34px}
 .paper-kicker{font-size:10px;letter-spacing:.3px;margin-bottom:22px}
 .paper-kicker span{margin:0 5px}
 h1{font-size:clamp(24px,5.7vw,36px);line-height:1.5;letter-spacing:0}
 .paper-values{margin-top:22px;font-size:11px}
 .paper-layout{display:block;padding:0 22px 32px}
 .paper-sidebar{position:static;max-height:none;overflow:visible;margin-bottom:35px;border-block:1px solid var(--line)}
 .paper-sidebar summary{padding:17px 0}
 .paper-sidebar ol{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));column-gap:18px;padding-bottom:16px}
 .paper-sidebar a{font-size:11px;gap:7px;padding:9px 0}
 .paper-sidebar a span{flex-basis:17px}
 .paper-preface{padding-bottom:35px}
 .paper-preface p:first-of-type{font-size:17px}
 .paper-section{padding-top:30px;padding-bottom:32px}
 .paper-section h2{font-size:20px;margin-bottom:22px;gap:11px}
 .paper-section p{font-size:15px;line-height:1.95;margin-bottom:20px}
 .paper-footer{align-items:start;font-size:10px;gap:12px}
 .paper-footer a{padding-top:0}
}
@media(max-width:380px){
 .paper-header,.paper-hero,.paper-layout{padding-inline:18px}
 .paper-brand{font-size:16px;gap:6px}
 .paper-nav{gap:16px;font-size:10px}
 .paper-kicker{letter-spacing:0}
 .paper-sidebar ol{grid-template-columns:1fr}
}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
@media print{
 :root,:root[data-theme]{color-scheme:light;--bg:#fff;--text:#111;--body:#222;--muted:#555;--line:#ddd;--mint:#111}
 .paper-header,.paper-sidebar,.paper-footer,.paper-copy-manual,.skip-link{display:none}
 .paper-hero{padding:0 0 28px;max-width:none}
 .paper-layout{display:block;max-width:none;padding:0}
 .paper-section{padding:24px 0}
 .paper-section h2{break-after:avoid}
 .paper-section p{orphans:3;widows:3;font-size:11pt;line-height:1.8}
 .paper-preface p:first-of-type{font-size:12pt}
 @page{margin:20mm}
}