:root{
  --c-bg:#E8F4F8;--c-panel:#F8FCFE;--c-panel-2:#DAEAF2;--c-border:#C6DCE7;--c-accent:#0A86C2;--c-accent-2:#14B4D8;--c-navy:#173A70;--c-navy-deep:#0E2A55;--c-text:#12233A;--c-muted:#4D6378;--c-sun:#F7DC7E;--c-coral:#EF6B5B;--c-white:#FFFFFF;
  --c-success:#1C9A68;--c-warn:#C4860C;--c-error:#D2453B;
  --a-sky-04:rgba(10,134,194,.04);--a-aqua-07:rgba(20,180,216,.07);--a-sky-08:rgba(10,134,194,.08);--a-sky-10:rgba(10,134,194,.10);--a-sky-12:rgba(10,134,194,.12);--a-sky-14:rgba(10,134,194,.14);--a-sky-16:rgba(10,134,194,.16);--a-sky-22:rgba(10,134,194,.22);--a-sky-30:rgba(10,134,194,.30);
  --a-navy-06:rgba(23,58,112,.06);--a-navy-08:rgba(23,58,112,.08);--a-navy-12:rgba(23,58,112,.12);--a-navy-18:rgba(23,58,112,.18);--a-navy-30:rgba(23,58,112,.30);
  --a-white-35:rgba(255,255,255,.35);--a-white-55:rgba(255,255,255,.55);--a-white-70:rgba(255,255,255,.70);--a-coral-14:rgba(239,107,91,.14);
  --flag-red:#D7303B;--flag-white:#FFFFFF;--flag-navy:#1C3A6E;--flag-black:#1D1D22;--flag-gold:#F3C431;
  --f-display:"Inter","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --f-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --f-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --r-pill:999px;--r-card:28px;--r-small:16px;--r-line:3px;
  --gutter:24px;--content-width:1248px;--header-height:72px;--anchor-gap:88px;--toc-gap:104px;
  --fs-body:17px;--fs-small:14px;--fs-h1:clamp(52px,4.4vw + 4px,66px);--fs-h2:clamp(26px,3vw,40px);--fs-h3:24px;
  --weight-display:800;--weight-strong:700;--weight-medium:600;--tracking:-.02em;
  --hl:inset 0 1px 0 var(--c-white),inset 0 0 0 1px var(--a-navy-06);
  --sh-card:0 18px 44px var(--a-sky-12),0 2px 6px var(--a-navy-06);
  --sh-float:0 16px 42px var(--a-sky-12),0 3px 8px var(--a-navy-08);
  --ease: .2s ease;--reveal-time:.65s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-gap);scroll-behavior:smooth}
body{margin:0;background:var(--c-bg);color:var(--c-text);font-family:var(--f-body);font-size:var(--fs-body);line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button,a,summary{touch-action:manipulation}
button{border:0}
img{max-width:100%;height:auto}
svg{flex-shrink:0}
ul{list-style:none;margin:0;padding:0}
figure{margin:0}
h1,h2,h3{font-family:var(--f-display);letter-spacing:var(--tracking);font-weight:var(--weight-display);text-wrap:balance}
h1{font-size:var(--fs-h1);line-height:1.12}
h2{font-size:var(--fs-h2);line-height:1.25}
h3{font-size:var(--fs-h3);line-height:1.35}
p{margin:0 0 1em}
:focus-visible{outline:2px solid var(--c-accent);outline-offset:3px;border-radius:var(--r-small)}
[hidden]{display:none!important}
.wrap{width:100%;max-width:var(--content-width);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:64px;padding-bottom:64px}
.no-break{white-space:nowrap}
.muted{color:var(--c-muted)}
.mono{font-family:var(--f-mono);font-weight:var(--weight-medium);letter-spacing:-.01em}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.panel,.card{background:var(--c-panel);border-radius:var(--r-card);box-shadow:var(--hl),var(--sh-card);padding:32px;min-width:0}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.grid>*{min-width:0}
.prose{max-width:880px;min-width:0;overflow-wrap:break-word}
.prose p{line-height:1.85}
.prose a{color:var(--c-navy);text-decoration:underline;text-underline-offset:4px}
.prose ul{list-style:disc;padding-left:1.5em;margin-block:20px}
.prose ol{padding-left:1.6em}
.prose li{margin-block:8px}
.prose h2{margin-top:48px}
code{font-family:var(--f-mono);overflow-wrap:anywhere;background:var(--c-panel-2);border-radius:var(--r-line);padding:2px 5px}
pre{max-width:100%;overflow-x:auto;padding:24px;background:var(--c-panel-2);border-radius:var(--r-small)}
pre code{overflow-wrap:normal;padding:0;white-space:pre}
.reveal{transition:opacity var(--reveal-time) ease,transform var(--reveal-time) ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:static;display:block;min-width:0;width:100%;max-width:100%;overflow:hidden;margin-block:24px}
#server-status>*{min-width:0;max-width:100%}
.decor-section{position:relative;overflow-x:clip;max-width:100%}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:56px;padding:0 36px;border-radius:var(--r-pill);font-family:var(--f-display);font-size:var(--fs-body);font-weight:var(--weight-display);letter-spacing:.01em;white-space:nowrap;flex-shrink:0;max-width:100%;transition:transform var(--ease),box-shadow var(--ease)}
.btn-solid,.btn-primary{color:var(--c-white);background:linear-gradient(120deg,var(--c-accent),var(--c-accent-2));box-shadow:inset 0 1px 0 var(--a-white-35),0 14px 34px var(--a-sky-30)}
.btn-solid:hover,.btn-primary:hover{transform:translateY(-2px)}
.btn-line,.btn-secondary{color:var(--c-navy);background:transparent;box-shadow:inset 0 0 0 2px var(--c-navy)}
.btn-line:hover,.btn-secondary:hover{background:var(--c-panel)}
.btn:active{transform:translateY(1px)}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--c-panel-2);color:var(--c-muted);box-shadow:none;cursor:not-allowed;transform:none}
.topbar{position:relative;z-index:20;background:var(--c-panel);border-bottom:1px solid var(--c-border)}
.topbar-in{display:flex;align-items:center;height:var(--header-height);gap:16px}
.brand{display:inline-flex;align-items:center;gap:10px;font-family:var(--f-display);font-weight:var(--weight-display);font-size:22px;letter-spacing:var(--tracking);color:var(--c-navy);flex:none}
.brand img{width:30px;height:30px;flex:none}
.brand-local{color:var(--c-muted);font-weight:var(--weight-medium)}
.tabs{display:flex;align-items:stretch;height:100%;margin-left:auto;min-width:0}
.tabs ul{display:flex;align-items:center;list-style:none;margin:0;padding:0;height:100%}
.tabs li{height:100%;flex:none}
.tab{position:relative;display:flex;align-items:center;height:100%;padding:0 14px;font-size:15px;font-weight:var(--weight-medium);color:var(--c-muted);white-space:nowrap;transition:color var(--ease)}
.tab::after{content:"";position:absolute;left:14px;right:14px;bottom:-1px;height:3px;border-radius:var(--r-line) var(--r-line) 0 0;background:linear-gradient(90deg,var(--c-accent),var(--c-accent-2));opacity:0;transform:scaleX(0);transition:transform .3s ease,opacity .3s ease}
.tab:hover{color:var(--c-navy)}
.tab:hover::after{opacity:.35;transform:scaleX(.45)}
.tab.is-current{color:var(--c-navy)}
.tab.is-current::after{opacity:1;transform:scaleX(1)}
.actions{display:flex;align-items:center;gap:12px;margin-left:12px;flex:none}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:40px;min-width:44px;width:auto;padding:0 14px;border:1px solid var(--c-border);border-radius:var(--r-pill);background:var(--c-white);font-size:var(--fs-small);font-weight:var(--weight-medium);color:var(--c-text);white-space:nowrap}
.lang svg{width:16px;height:16px;color:var(--c-muted)}
.lang span{white-space:nowrap}
.language-picker{position:relative}
.language-menu{position:absolute;right:0;top:calc(100% + 12px);width:180px;padding:8px;background:var(--c-panel);border-radius:var(--r-small);box-shadow:var(--hl),var(--sh-float);z-index:25}
.language-menu a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-pill)}
.language-menu a:hover,.language-menu a[aria-current]{background:var(--c-panel-2);color:var(--c-navy)}
.login{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:0 22px;border-radius:var(--r-pill);background:var(--c-navy);color:var(--c-white);font-size:15px;font-weight:var(--weight-strong);white-space:nowrap;box-shadow:inset 0 1px 0 var(--a-white-35),0 8px 20px var(--a-navy-18);transition:transform var(--ease)}
.login:hover{transform:translateY(-1px)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;border-radius:var(--r-pill);background:var(--c-panel-2);color:var(--c-navy)}
.menu-toggle svg{width:22px;height:22px}
.mobile-drawer{display:none}
html.nav-open{overflow:hidden}
.footer{background:var(--c-navy);color:var(--c-panel);padding-top:56px;padding-bottom:24px}
.footer-grid{display:grid;grid-template-columns:1.35fr 1fr 1fr 1fr;gap:40px}
.footer-grid>*{min-width:0}
.footer .brand{color:var(--c-white)}
.footer p{margin-top:16px;color:var(--c-panel-2);font-size:15px}
.footer h2{font-size:var(--fs-body);margin:0 0 16px}
.footer-links{display:flex;flex-direction:column;align-items:flex-start;gap:8px}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;font-size:var(--fs-small)}
.footer-links a:hover{text-decoration:underline;text-underline-offset:4px}
.footer-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:16px;margin-top:40px;padding-top:24px;border-top:1px solid var(--a-white-35);font-size:var(--fs-small)}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px}
.footer-legal a{min-height:24px}
@media(max-width:1200px){
 .tabs .tab{padding-inline:9px}.tab::after{left:9px;right:9px}.topbar-in{gap:10px}.actions{gap:8px;margin-left:4px}
}
@media(max-width:1050px){
 .topbar-in{height:var(--header-height)}.topbar-in>.tabs{display:none}.actions{margin-left:auto}.menu-toggle{display:inline-flex}
 .mobile-drawer:not([hidden]){display:block;position:absolute;left:0;right:0;top:100%;background:var(--c-panel);padding:16px var(--gutter) 24px;max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;border-bottom:1px solid var(--c-border);box-shadow:var(--sh-card);z-index:22}
 .mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;border-radius:var(--r-small)}
 .mobile-drawer a[aria-current]{background:var(--c-panel-2);color:var(--c-navy);font-weight:var(--weight-strong)}
 .drawer-languages{margin-top:16px;padding-top:16px;border-top:1px solid var(--c-border)}
}
@media(max-width:768px){
 :root{--fs-h1:clamp(28px,7.6vw,40px)}
 .grid{grid-template-columns:1fr}.footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
 .section{padding-top:40px;padding-bottom:40px}.panel,.card{padding:24px}
}
@media(max-width:640px){
 :root{--gutter:16px}.no-break{white-space:normal}.tilt{transform:none}
 .brand{font-size:20px;gap:6px}.brand img{width:26px;height:26px}
 .actions{margin-left:auto;gap:6px}.lang{padding-inline:10px;font-size:13px}.login{padding-inline:14px;font-size:var(--fs-small)}
 .footer-grid{grid-template-columns:1fr}.btn{min-height:52px;padding-inline:28px;font-size:16px}
 .decor-section{max-width:100%}
}
@media(max-width:360px){.actions .lang span{display:none}.topbar-in{gap:6px}}
@media(prefers-reduced-motion:reduce){
 html{scroll-behavior:auto}.reveal,.reveal.pending{opacity:1;transform:none;transition:none}
 .btn,.login,.tab,.tab::after{transition:none}
}