:root{--bg:#e9eef0;--ink:#263b46;--accent:#477a8d;--panel:color-mix(in srgb,var(--bg) 93%,var(--ink));--muted:color-mix(in srgb,var(--ink) 70%,var(--bg));--line:color-mix(in srgb,var(--ink) 20%,var(--bg));--on:#ffffff;--font:Arial,"Microsoft YaHei",sans-serif;--width:1160px;--cols:4;--radius:5px;color-scheme:light}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:25px}
body{margin:0;background:var(--bg);color:var(--ink);font:calc(15px*var(--reading-scale,1))/1.75 var(--font);overflow-wrap:anywhere}
a{color:inherit;text-decoration:none}
a:hover{color:var(--accent)}
button,input,select,textarea{font-family:inherit;color:inherit;max-width:100%}
button,a,input,select,textarea{touch-action:manipulation}
button{cursor:pointer}
img{max-width:100%;display:block}
h1,h2,h3,p,figure,blockquote,dl,dd{margin:0}
h1,h2,h3{line-height:1.25}
h1{font-size:clamp(32px,4.2vw,70px);letter-spacing:-.035em}
h2{font-size:clamp(22px,2.5vw,34px)}
h3{font-size:18px}
p{line-height:1.85}
[hidden]{display:none!important}
:focus-visible{outline:2px solid var(--accent);outline-offset:4px}
.s21f137eaa-skip{position:absolute;left:15px;top:-100px;z-index:100;background:var(--accent);color:var(--on);padding:14px}
.s21f137eaa-skip:focus{top:15px}
.s21f137eaa-masthead{padding:25px 36px;border-bottom:1px solid var(--line)}
.s21f137eaa-floating-bar{max-width:var(--width);margin:auto;display:flex;align-items:center;justify-content:space-between;gap:28px}
.s21f137eaa-brand{display:flex;align-items:center;gap:14px;max-width:340px}
.s21f137eaa-brand img{flex-shrink:0}
.s21f137eaa-brand strong{font-size:22px;line-height:1.25;display:block}
.s21f137eaa-brand small{display:block;font-size:9px;line-height:1.8;color:var(--muted);margin-top:6px}
.s21f137eaa-nav{display:flex;gap:23px;flex-wrap:wrap;align-items:center}
.s21f137eaa-nav a{font-size:13px;white-space:nowrap;padding:8px 0}
.s21f137eaa-floating-bar{border:1px solid var(--line);border-radius:50px;padding:18px 27px;background:var(--panel)}
.s21f137eaa-search-jump{font-size:12px;white-space:nowrap}
.s21f137eaa-focus-mode .s21f137eaa-masthead,.s21f137eaa-focus-mode .s21f137eaa-site-footer{display:none}
.s21f137eaa-site-footer{width:min(var(--width),calc(100% - 64px));margin:68px auto 0;border-top:1px solid var(--line);padding:34px 0;display:flex;justify-content:space-between;align-items:start;gap:34px}
.s21f137eaa-site-footer nav{display:flex;gap:21px;flex-wrap:wrap;font-size:11px}
.s21f137eaa-site-footer p{font-size:11px;color:var(--muted);max-width:460px}
.s21f137eaa-site-footer small{display:block;font-size:9px;color:var(--muted);margin-top:11px}
.s21f137eaa-site-footer>header{width:100%;display:flex;justify-content:space-between;gap:23px}
.s21f137eaa-site-footer>section{max-width:650px}
@media(max-width:1000px){.s21f137eaa-site-footer{flex-wrap:wrap}}
@media(max-width:760px){.s21f137eaa-masthead{padding:20px 18px}
.s21f137eaa-brand strong{font-size:19px}
.s21f137eaa-brand small{font-size:9px}
.s21f137eaa-brand img{width:31px;height:31px}
.s21f137eaa-nav{gap:18px;flex-wrap:nowrap;overflow:auto}
.s21f137eaa-nav a{font-size:11px}
.s21f137eaa-floating-bar{border-radius:14px;padding:16px;flex-wrap:wrap;gap:17px}
.s21f137eaa-floating-bar>.s21f137eaa-nav{order:3;width:100%}
.s21f137eaa-site-footer{width:calc(100% - 32px);display:block;margin-top:45px}
.s21f137eaa-site-footer>div,.s21f137eaa-site-footer>nav{margin-top:25px}
.s21f137eaa-site-footer>header{display:block}
.s21f137eaa-site-footer>header>nav{margin-top:20px}
.s21f137eaa-site-footer>section+nav{margin-top:22px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}
*{transition:none!important}}
[data-card][hidden]{display:none!important}
.s21f137eaa-page-top{position:fixed;bottom:20px;right:20px;z-index:40;background:var(--accent);color:var(--on);border:0;padding:14px;cursor:pointer}
@media(max-width:650px){.s21f137eaa-page-top{bottom:12px;right:12px}}
.s21f137eaa-source-expand{padding:11px 16px;background:var(--panel);color:var(--ink);border:1px solid var(--line);font-family:inherit;font-size:12px;line-height:1.5;margin-top:17px;cursor:pointer}