:root{
  --bg:#F5EFE3;--bg-top:#FAF6EE;--bg-bottom:#EFE7D8;--panel:#FCF9F2;--panel-2:#EDE4D2;--panel-side:#F6F0E5;--panel-bar:#F2EBDD;--wall:#F0E9DC;
  --border:#DCD0BA;--border-soft:rgba(220,208,186,.62);--accent:#3B6AA0;--accent-dark:#274B78;--accent-10:rgba(59,106,160,.10);--accent-12:rgba(59,106,160,.12);--accent-16:rgba(59,106,160,.16);--accent-40:rgba(59,106,160,.40);
  --text:#2A2219;--text-muted:#6E6252;--text-faint:#9A8D79;--success:#4E8A4F;--warn:#B7832A;--error:#B4473A;
  --ink-06:rgba(42,34,25,.06);--ink-10:rgba(42,34,25,.10);--ink-14:rgba(42,34,25,.14);--hi:rgba(255,255,255,.92);--hi-soft:rgba(255,255,255,.30);--hi-btn:rgba(255,255,255,.22);--glass:rgba(237,228,210,.86);--veil:rgba(42,34,25,.28);--clear:transparent;
  --paint-sky:#A7B9CF;--paint-lilac:#BFB4C6;--paint-cream:#EDE0C8;--paint-dusk:#E7CFA4;--paint-cloud:rgba(247,239,226,.78);--paint-cloud-warm:rgba(236,204,168,.55);--paint-cloud-cool:rgba(160,176,204,.45);--paint-glow:rgba(241,197,128,.78);
  --paint-hill-a:#B6ADB8;--paint-hill-b:#A39CA3;--paint-city:#9290A2;--paint-city-deep:#7B798A;--paint-plain-far:#BBAE8D;--paint-plain:#9F956D;--paint-plain-near:#746F4D;--paint-field:rgba(92,96,60,.48);--paint-field-light:rgba(216,197,150,.55);--paint-water-far:#F1D39E;--paint-water:#C4CCD3;--paint-water-near:#7D97B5;--paint-ripple:rgba(255,247,230,.34);--paint-sheen:rgba(255,234,192,.70);--vignette:rgba(82,52,22,.10);
  --flag-red:#C8392E;--flag-blue:#2E4A7E;--flag-white:#FFFDF8;--flag-yellow:#F1C232;--flag-edge:rgba(42,34,25,.20);
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --fs-display:64px;--fs-display-mobile:36px;--fs-h2:32px;--fs-h3:21px;--fs-body:17px;--fs-lead:20px;--fs-button:16px;--fs-brand:18px;--fs-nav:14.5px;--fs-small:14px;--fs-caption:13px;--fs-tiny:12px;--fs-micro:11px;
  --r-xs:5px;--r-sm:7px;--r-md:8px;--r-btn:10px;--r-lg:12px;--r-pill:999px;--r-round:50%;
  --gutter:24px;--shell-max:1344px;--header-h:64px;--toc-offset:80px;--anchor-offset:152px;--ease:ease;--quick:.18s;--reveal-time:.35s;
  --shadow-board:0 44px 90px -40px var(--accent-16),0 18px 40px -28px var(--ink-14);
  --shadow-win:0 30px 70px -22px var(--accent-12),0 8px 20px -12px var(--ink-14),inset 0 1px 0 var(--hi);
  --shadow-win-front:0 36px 80px -20px var(--accent-16),0 12px 26px -14px var(--ink-14),inset 0 1px 0 var(--hi);
  --shadow-float:0 16px 32px -14px var(--accent-16),0 3px 8px -4px var(--ink-10),inset 0 1px 0 var(--hi);
  --grain:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='g'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 .30 0 0 0 0 .21 0 0 0 0 .12 0 0 0 1 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23g)'/%3E%3C/svg%3E");
  --brush:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='640' height='420'%3E%3Cfilter id='b' x='0' y='0' width='100%25' height='100%25'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.006 .07' numOctaves='4' seed='11'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3CfeComponentTransfer%3E%3CfeFuncR type='linear' slope='2.4' intercept='-.7'/%3E%3CfeFuncG type='linear' slope='2.4' intercept='-.7'/%3E%3CfeFuncB type='linear' slope='2.4' intercept='-.7'/%3E%3CfeFuncA type='linear' slope='0' intercept='1'/%3E%3C/feComponentTransfer%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23b)'/%3E%3C/svg%3E");
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--toc-offset);scroll-behavior:smooth}
html.nav-open{overflow:hidden}
body{margin:0;font-family:var(--font-body);font-size:var(--fs-body);line-height:1.6;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
body::after{content:"";position:fixed;inset:0;z-index:100;pointer-events:none;background-image:var(--grain);background-size:200px 200px;opacity:.03;mix-blend-mode:multiply}
[hidden]{display:none!important}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline;text-underline-offset:4px}
ul{margin:0;padding:0;list-style:none}
p{margin:0}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button:disabled{cursor:not-allowed}
img{max-width:100%;height:auto}
svg{flex-shrink:0}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--r-xs)}
h1,h2,h3{font-family:var(--font-display);text-wrap:balance}
h1{margin:0 0 22px;font-size:clamp(52px,4.5vw,var(--fs-display));font-weight:400;line-height:1.1;letter-spacing:-.02em}
h2{margin:0 0 24px;font-size:var(--fs-h2);font-weight:400;line-height:1.3;letter-spacing:-.02em}
h3{margin:0 0 12px;font-size:var(--fs-h3);font-weight:600;line-height:1.4}
.no-break{white-space:nowrap}
.shell,.wrap{width:100%;max-width:var(--shell-max);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{width:100%;max-width:880px;margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:72px;padding-bottom:72px}
.section-head{max-width:760px;margin-bottom:32px}
.section-head p,.muted{color:var(--text-muted)}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.grid>*,.shell>*,.wrap>*,.reading-wrap>*{min-width:0}
.panel,.paper-card{padding:24px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-lg);box-shadow:var(--shadow-win)}
.panel--recess{background:var(--panel-2);box-shadow:inset 0 1px 2px var(--ink-06)}
.prose{overflow-wrap:break-word;min-width:0}
.prose p,.prose ul,.prose ol,.prose pre,.prose blockquote{margin-bottom:24px}
.prose ul{list-style:disc;padding-left:24px}
.prose ol{padding-left:24px}
.prose h2{margin-top:48px}
.prose h3{margin-top:28px}
code{font-family:var(--font-mono);font-size:.88em;overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--panel-2)}
pre code{white-space:pre;overflow-wrap:normal}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.ico{width:20px;height:20px;display:inline-block;color:inherit}
.flag{width:21px;height:14px;display:inline-block;overflow:hidden;border-radius:2px}
.f-red{fill:var(--flag-red)}.f-white{fill:var(--flag-white)}.f-blue{fill:var(--flag-blue)}.f-yellow{fill:var(--flag-yellow)}.f-edge{fill:none;stroke:var(--flag-edge);stroke-width:1}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.cta-row{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:12px;margin-bottom:20px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:10px 22px;font-size:var(--fs-button);font-weight:500;letter-spacing:-.005em;line-height:1.5;border:1px solid var(--clear);border-radius:var(--r-btn);transition:transform var(--quick) var(--ease);flex-shrink:0;white-space:nowrap}
.btn svg{width:16px;height:16px}
.btn:hover{transform:translateY(-1px);text-decoration:none}
.btn--primary,.btn-primary{color:var(--panel);background:linear-gradient(180deg,var(--accent) 0%,var(--accent) 55%,var(--accent-dark) 140%);box-shadow:0 12px 26px -12px var(--accent-40),inset 0 1px 0 var(--hi-btn)}
.btn--primary:hover,.btn-primary:hover{background:var(--accent-dark)}
.btn--ghost{color:var(--text);background:var(--panel);border-color:var(--border);box-shadow:inset 0 1px 0 var(--hi),0 1px 2px var(--ink-06)}
.btn--ghost:hover{border-color:var(--text-faint)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.55;transform:none;pointer-events:none}
.btn--small{min-height:40px;padding:8px 14px;font-size:var(--fs-small)}
.page-top{background:linear-gradient(180deg,var(--bg-top) 0%,var(--bg) 46%,var(--bg-bottom) 100%)}
#site-header,.masthead{position:relative;z-index:50}
.masthead__row{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;height:var(--header-h);gap:16px}
.brand{display:inline-flex;align-items:center;gap:10px;justify-self:start;color:var(--text);white-space:nowrap}
.brand:hover{text-decoration:none}
.brand__mark{display:block;width:28px;height:28px;flex-shrink:0}
.brand__en{font-family:var(--font-display);font-size:var(--fs-brand);font-weight:600;letter-spacing:-.02em;color:var(--text)}
.topnav{min-width:0}
.topnav ul{display:flex;align-items:center;list-style:none;margin:0;padding:0}
.topnav li{display:flex;align-items:center;font-size:var(--fs-nav);white-space:nowrap}
.topnav li+li::before{content:"·";margin:0 11px;color:var(--text-faint)}
.topnav a{display:inline-flex;align-items:center;min-height:32px;color:var(--text-muted)}
.topnav a:hover{color:var(--text);text-decoration:none}
.topnav a[aria-current="page"]{color:var(--text);font-weight:500}
.masthead__tools{justify-self:end;display:flex;align-items:center;gap:14px;flex-shrink:0}
.language{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;min-height:34px;width:auto;background:none;border:0;padding:6px 4px;font-size:var(--fs-small);color:var(--text-muted)}
.lang span{white-space:nowrap}
.lang svg{width:15px;height:15px}
.lang:hover{color:var(--text)}
.lang-panel{position:absolute;right:0;top:calc(100% + 8px);z-index:65;min-width:180px;padding:6px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:var(--shadow-float)}
.lang-panel a{display:flex;align-items:center;width:100%;min-height:44px;padding:8px 12px;color:var(--text);font-size:var(--fs-small);border-radius:var(--r-xs)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--panel-2);text-decoration:none}
.btn-login{display:inline-flex;align-items:center;justify-content:center;height:34px;padding:0 16px;font-size:var(--fs-small);font-weight:500;color:var(--text);background:var(--panel);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:inset 0 1px 0 var(--hi),0 1px 2px var(--ink-06);white-space:nowrap}
.btn-login:hover{border-color:var(--text-faint);text-decoration:none}
.menu-btn{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;padding:10px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--panel);color:var(--text)}
.menu-btn__line{display:block;width:20px;height:2px;background:currentColor;flex-shrink:0}
.nav-drawer{position:fixed;top:var(--header-h);right:0;left:0;z-index:48;height:calc(100dvh - var(--header-h));max-height:calc(100dvh - var(--header-h));overflow-y:auto;overscroll-behavior:contain;padding:16px var(--gutter) 40px;background:var(--panel);border-top:1px solid var(--border)}
.nav-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;color:var(--text);border-bottom:1px solid var(--border-soft)}
.nav-drawer a[aria-current="page"]{background:var(--accent-10);color:var(--accent-dark)}
.nav-drawer__languages{margin-top:20px;border-top:1px solid var(--border)}
.nav-veil{position:fixed;top:var(--header-h);right:0;bottom:0;left:0;z-index:45;background:var(--veil);border:0}
.site-footer{margin-top:48px;padding-top:48px;padding-bottom:28px;background:var(--panel-2);border-top:1px solid var(--border)}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1.2fr;gap:40px}
.footer-brand p{max-width:340px;margin-top:18px;font-size:var(--fs-small);color:var(--text-muted)}
.footer-heading{font-size:var(--fs-small);font-weight:600;margin:0 0 16px}
.footer-links{display:flex;flex-wrap:wrap;gap:8px 20px}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:28px;font-size:var(--fs-small);color:var(--text-muted)}
.footer-languages{display:flex;flex-wrap:wrap;gap:12px 24px;margin-top:32px;padding-top:24px;border-top:1px solid var(--border)}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;margin-top:24px;font-size:var(--fs-tiny);color:var(--text-muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px}
.reveal{transition:opacity var(--reveal-time) var(--ease),transform var(--reveal-time) var(--ease)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-width:0;max-width:100%;min-height:120px;overflow:hidden;margin-top:24px;margin-bottom:32px}
#server-status>*{min-width:0;max-width:100%}
#server-status+*{margin-top:32px}
@media(min-width:1101px) and (max-width:1320px){
  .masthead__row{grid-template-columns:auto minmax(0,1fr) auto;gap:20px}
  .topnav ul{justify-content:center}
  .topnav li+li::before{margin-inline:7px}
  .masthead__tools{gap:8px}
}
@media(max-width:1100px){
  .masthead__row{display:flex;flex-wrap:nowrap;gap:10px}
  .topnav{display:none}
  .masthead__tools{margin-left:auto;gap:8px}
  .menu-btn{display:inline-flex}
  .grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(min-width:1101px){.nav-drawer,.nav-veil{display:none!important}}
@media(max-width:768px){
  h1{font-size:var(--fs-display-mobile)}
  h2{font-size:28px}
  .section{padding-top:48px;padding-bottom:48px}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1/-1}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .grid,.footer-grid{grid-template-columns:minmax(0,1fr)}
  .masthead__row{gap:6px}
  .brand{gap:6px}
  .brand__mark{width:24px;height:24px}
  .brand__en{font-size:var(--fs-button)}
  .masthead__tools{gap:4px;margin-left:auto}
  .btn-login{padding-inline:10px;font-size:var(--fs-caption)}
  .lang{font-size:var(--fs-tiny);gap:3px;padding-inline:2px}
  .lang svg{width:12px;height:12px}
  .menu-btn{padding:8px}
  .panel,.paper-card{padding:20px}
  .tilt,[data-tilt]{transform:none;max-width:100%}
  .decorated{overflow-x:clip;max-width:100%}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none;transition:none}
  .btn{transition:none}
  .btn:hover{transform:none}
}