:root{
  color-scheme:light;
  --bg:#F9F9FB;
  --bg-panel:#FFFFFF;
  --bg-panel-2:#F1F1F6;
  --border:#E4E3EE;
  --accent:#6650FA;
  --accent-dark:#4A36D6;
  --accent-2:#3F8CF5;
  --text:#1E2230;
  --text-muted:#5F6478;
  --success:#1F9D6B;
  --warn:#C98A0E;
  --error:#D43D4F;
  --on-accent:#FFFFFF;
  --accent-rgb:102 80 250;
  --accent-2-rgb:63 140 245;
  --text-rgb:30 34 48;
  --muted-rgb:95 100 120;
  --success-rgb:31 157 107;
  --border-rgb:228 227 238;
  --white-rgb:255 255 255;
  --toggle-off:#E9E8F0;
  --toggle-on:#B7B6C7;
  --flag-red:#D52B3A;
  --flag-blue:#2B3A86;
  --flag-white:#FFFFFF;
  --flag-edge:rgb(30 34 48 / .16);
  --mask:#000000;
  --clear:transparent;
  --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,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --weight-normal:400;
  --weight-medium:500;
  --weight-semibold:600;
  --weight-bold:700;
  --weight-brand:800;
  --weight-display:900;
  --r-card:20px;
  --r-tile:12px;
  --r-sm:8px;
  --r-menu:14px;
  --r-mini:16px;
  --r-icon:7px;
  --r-badge:11px;
  --r-pill:999px;
  --r-round:50%;
  --gutter:40px;
  --wrap-max:1320px;
  --header-height:72px;
  --anchor-space:88px;
  --toc-space:152px;
  --space-section:88px;
  --font-h1:clamp(52px,4.8vw,68px);
  --font-h2:clamp(28px,3vw,44px);
  --font-h3:22px;
  --font-body-size:16px;
  --line-body:1.75;
  --ease-ui:.15s ease;
  --ease-reveal:.35s ease;
  --shadow-card:0 0 0 1px rgb(var(--border-rgb) / .9),inset 0 1px 0 rgb(var(--white-rgb)),inset 0 -2px 0 rgb(var(--accent-rgb) / .035),0 20px 40px -18px rgb(var(--accent-rgb) / .20),0 4px 10px -4px rgb(var(--accent-rgb) / .10);
  --shadow-focus:0 0 0 1px rgb(var(--border-rgb)),inset 0 1px 0 rgb(var(--white-rgb)),inset 0 -3px 0 rgb(var(--accent-rgb) / .05),0 30px 60px -22px rgb(var(--accent-rgb) / .30),0 8px 18px -8px rgb(var(--accent-rgb) / .16);
  --shadow-chip:0 0 0 1px rgb(var(--border-rgb) / .95),0 3px 8px -4px rgb(var(--accent-rgb) / .14);
  --shadow-button:inset 0 1px 0 rgb(var(--white-rgb) / .28),0 16px 32px -12px rgb(var(--accent-rgb) / .6),0 3px 8px -2px rgb(var(--accent-rgb) / .3);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-space);scroll-behavior:smooth}
body{margin:0;font-family:var(--font-body);font-size:var(--font-body-size);line-height:var(--line-body);color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
h1,h2,h3,h4,p,ul,ol,dl,dd,blockquote,figure{margin:0}
h1,h2,h3,h4{font-family:var(--font-display);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--font-h1);font-weight:var(--weight-display);line-height:1.12;letter-spacing:-.02em}
h2{font-size:var(--font-h2);font-weight:var(--weight-display);line-height:1.2;letter-spacing:-.02em}
h3{font-size:var(--font-h3);font-weight:var(--weight-bold);line-height:1.4}
ul,ol{padding-left:1.4em}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button:disabled{cursor:not-allowed}
button{border:0}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
button svg,a svg{flex-shrink:0}
[hidden]{display:none!important}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px}
::selection{background:rgb(var(--accent-rgb) / .16);color:var(--text)}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;border:1px solid var(--border);border-radius:var(--r-tile);background:var(--bg-panel-2);font-family:var(--font-mono)}
pre code{overflow-wrap:normal;white-space:pre}
table{border-collapse:collapse}
th,td{word-break:keep-all}
fieldset{min-width:0;border:1px solid var(--border);border-radius:var(--r-tile)}
.wrap{width:100%;max-width:var(--wrap-max);margin-inline:auto;padding-inline:var(--gutter)}
.wrap>*{min-width:0}
.section{padding-top:var(--space-section);padding-bottom:var(--space-section)}
.section-head{max-width:720px;margin-bottom:32px}
.section-head p{margin-top:18px;color:var(--text-muted)}
.no-break{white-space:nowrap}
.muted{color:var(--text-muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.kicker{display:block;margin-bottom:20px;color:var(--accent);font-size:15px;font-weight:var(--weight-semibold)}
.grid-two{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}
.grid-three{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.grid-two>*,.grid-three>*{min-width:0}
.panel,.card{min-width:0;padding:28px;border-radius:var(--r-card);background:var(--bg-panel);box-shadow:var(--shadow-card)}
.panel p+p,.card p+p{margin-top:16px}
.button-row{display:flex;align-items:center;flex-wrap:wrap;gap:16px}
.btn,.btn-primary,.btn-secondary{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;
  padding:12px 26px;border:1px solid var(--clear);border-radius:var(--r-pill);
  font-size:16px;font-weight:var(--weight-semibold);line-height:1.4;white-space:nowrap;flex-shrink:0;
  transition:background-color var(--ease-ui),transform var(--ease-ui),box-shadow var(--ease-ui);
}
.btn-primary{height:52px;padding:0 32px;letter-spacing:.01em;color:var(--on-accent);background:var(--accent);box-shadow:var(--shadow-button)}
.btn-primary:hover,.btn-primary.is-hover{background:var(--accent-dark)}
.btn-primary:active,.btn-primary.is-pressed{transform:translateY(1px)}
.btn-primary:disabled{background:var(--bg-panel-2);color:var(--text-muted);box-shadow:none}
.btn-secondary{color:var(--text);background:var(--bg-panel);border-color:var(--border);box-shadow:var(--shadow-chip)}
.btn-secondary:hover{border-color:var(--accent);color:var(--accent-dark)}
.btn.is-focus{outline:2px solid var(--accent);outline-offset:3px}
.link-arrow{display:inline-flex;align-items:center;gap:6px;min-height:24px;font-size:16px;font-weight:var(--weight-medium);color:var(--text)}
.link-arrow svg{width:15px;height:15px;color:var(--text-muted);transition:transform var(--ease-ui)}
.link-arrow:hover svg{transform:translateX(3px)}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.ico-s{fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.ico-f{fill:currentColor}
.fl-w{fill:var(--flag-white)}
.fl-r{fill:var(--flag-red)}
.fl-b{fill:var(--flag-blue)}
.fl-edge{fill:none;stroke:var(--flag-edge);stroke-width:1}
.stage{position:relative;overflow-x:clip;max-width:100%;background:linear-gradient(180deg,rgb(var(--accent-rgb) / .06) 0%,rgb(var(--accent-2-rgb) / .045) 42%,rgb(var(--accent-2-rgb) / 0) 100%),var(--bg)}
.stage::before{content:"";position:absolute;inset:0;pointer-events:none;background-image:linear-gradient(rgb(var(--text-rgb) / .035) 1px,var(--clear) 1px),linear-gradient(90deg,rgb(var(--text-rgb) / .035) 1px,var(--clear) 1px);background-size:40px 40px;background-position:-1px -1px;mask-image:linear-gradient(180deg,var(--mask) 0%,var(--mask) 55%,var(--clear) 100%)}
.decor-region{position:relative;overflow-x:clip}
[data-parallax-decor]{pointer-events:none;max-width:100%}
.topbar{position:relative;z-index:40}
.topbar__in{display:flex;align-items:center;height:var(--header-height);gap:24px;flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:10px;flex:none;min-height:32px}
.brand__mark{display:block;width:32px;height:32px;filter:drop-shadow(0 4px 8px rgb(var(--accent-rgb) / .28))}
.brand__word{font-family:var(--font-display);font-weight:var(--weight-brand);font-size:20px;letter-spacing:-.02em;color:var(--text)}
.mainnav{flex:1;min-width:0;margin-left:auto}
.mainnav ul{display:flex;align-items:center;justify-content:flex-end;list-style:none;margin:0;padding:0;gap:2px}
.mainnav a{display:inline-flex;align-items:center;gap:6px;height:36px;padding:0 11px;border-radius:var(--r-pill);font-size:14px;font-weight:var(--weight-medium);color:var(--text-muted);white-space:nowrap;transition:background-color var(--ease-ui),color var(--ease-ui)}
.mainnav a svg{width:16px;height:16px;flex:none}
.mainnav a:hover{color:var(--text);background:rgb(var(--accent-rgb) / .06)}
.mainnav a[aria-current="page"]{color:var(--text);background:rgb(var(--white-rgb) / .85);box-shadow:var(--shadow-chip)}
.tools{display:flex;align-items:center;gap:10px;flex:none}
.lang{position:relative}
.lang__button,.lang summary{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;height:36px;padding:0 10px;font-size:14px;color:var(--text-muted);background:var(--clear);cursor:pointer;list-style:none;border-radius:var(--r-pill);white-space:nowrap}
.lang__button span{white-space:nowrap}
.lang summary::-webkit-details-marker{display:none}
.lang__button:hover,.lang summary:hover{color:var(--text);background:rgb(var(--accent-rgb) / .06)}
.lang__caret{font-size:11px}
.lang__panel{position:absolute;right:0;top:44px;z-index:60;min-width:148px;list-style:none;margin:0;padding:6px;background:var(--bg-panel);border-radius:var(--r-menu);box-shadow:var(--shadow-card)}
.lang__panel a{display:flex;align-items:center;min-height:36px;padding:8px 12px;border-radius:var(--r-sm);font-size:14px;color:var(--text-muted)}
.lang__panel a:hover,.lang__panel a[aria-current="true"]{background:var(--bg-panel-2);color:var(--text)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;min-height:38px;padding:0 20px;border-radius:var(--r-pill);font-size:14px;font-weight:var(--weight-semibold);white-space:nowrap;color:var(--text);background:var(--bg-panel);box-shadow:0 0 0 1px var(--border),0 4px 12px -6px rgb(var(--accent-rgb) / .22);transition:box-shadow var(--ease-ui)}
.btn-login:hover{box-shadow:0 0 0 1px rgb(var(--accent-rgb) / .35),0 6px 16px -6px rgb(var(--accent-rgb) / .3)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;padding:10px;border-radius:var(--r-tile);background:var(--bg-panel-2);color:var(--text)}
.menu-toggle__line{display:block;width:20px;height:2px;background:currentColor;border-radius:var(--r-pill)}
.menu-toggle[aria-expanded="true"]{color:var(--accent-dark);background:var(--bg-panel)}
.mobile-drawer{display:none;position:fixed;top:var(--header-height);left:0;right:0;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;z-index:35;padding:20px var(--gutter) 40px;background:var(--bg-panel);border-top:1px solid var(--border)}
.mobile-drawer ul{list-style:none;margin:0;padding:0}
.mobile-drawer a{display:flex;align-items:center;gap:12px;width:100%;min-height:48px;padding:12px;border-radius:var(--r-tile);font-size:16px}
.mobile-drawer a svg{width:18px;height:18px}
.mobile-drawer a:hover,.mobile-drawer a[aria-current]{background:var(--bg-panel-2);color:var(--accent-dark)}
.mobile-drawer__languages{margin-top:20px!important;padding-top:16px!important;border-top:1px solid var(--border)}
html.nav-open{overflow:hidden}
.site-footer{padding-top:56px;padding-bottom:24px;background:var(--bg-panel-2);border-top:1px solid var(--border)}
.footer-grid{display:grid;grid-template-columns:1.1fr 1fr 1fr;gap:48px}
.footer-brand p{max-width:30em;margin-top:18px;font-size:14px;color:var(--text-muted)}
.footer-title{font-size:14px;font-weight:var(--weight-bold);margin-bottom:14px}
.footer-links{display:flex;flex-wrap:wrap;gap:6px 18px;list-style:none;padding:0}
.footer-links a{display:inline-flex;align-items:center;min-height:30px;font-size:14px;color:var(--text-muted);overflow-wrap:anywhere}
.footer-links a:hover{color:var(--accent-dark)}
.footer-languages{display:flex;align-items:center;flex-wrap:wrap;gap:8px 20px;margin-top:36px;padding-top:24px;border-top:1px solid var(--border)}
.footer-languages a{display:inline-flex;align-items:center;min-height:30px;font-size:14px}
.footer-languages a[aria-current]{font-weight:var(--weight-bold);color:var(--accent-dark)}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;margin-top:24px;font-size:13px;color:var(--text-muted)}
.footer-legal{display:flex;gap:20px}
.footer-legal a{display:inline-flex;align-items:center;min-height:28px}
.prose{max-width:800px;min-width:0;overflow-wrap:break-word}
.prose h2{margin-top:48px;margin-bottom:20px;font-size:32px}
.prose h3{margin-top:32px;margin-bottom:14px}
.prose p,.prose ul,.prose ol,.prose pre,.prose blockquote{margin-bottom:20px}
.prose li+li{margin-top:8px}
.prose p a,.prose li a{color:var(--accent-dark);text-decoration:underline;text-underline-offset:3px}
.prose img{border-radius:var(--r-tile)}
.reveal{transition:opacity var(--ease-reveal),transform var(--ease-reveal)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-width:0;min-height:96px;max-width:100%;overflow:hidden;margin-block:24px}
#server-status+*{margin-top:24px}
#server-status>*{min-width:0;max-width:100%}
@media(min-width:1181px) and (max-width:1320px){
  .topbar__in{gap:14px}
  .mainnav a{padding-inline:8px;font-size:13px}
  .tools{gap:6px}
}
@media(max-width:1180px){
  .mainnav{display:none}
  .tools{margin-left:auto}
  .menu-toggle{display:inline-flex}
  .mobile-drawer:not([hidden]){display:block}
}
@media(max-width:768px){
  :root{--gutter:20px;--space-section:56px;--font-h1:40px;--font-h2:32px}
  .topbar__in{gap:12px}
  .btn-primary{height:48px;padding-inline:26px}
  .grid-three{grid-template-columns:minmax(0,1fr)}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:32px}
  .footer-brand{grid-column:1/-1}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .tilt,.isometric-card{transform:none}
  .grid-two{grid-template-columns:minmax(0,1fr)}
  .panel,.card{padding:22px}
  .prose h2{font-size:28px}
  .decor-region,[data-parallax-decor]{max-width:100%}
  .tools{gap:4px;margin-left:auto}
  .topbar__in{gap:6px}
  .brand{gap:7px}
  .brand__word{font-size:18px}
  .brand__mark{width:28px;height:28px}
  .lang__button,.lang summary{font-size:12px;padding-inline:6px}
  .btn-login{padding-inline:13px;font-size:13px}
}
@media(max-width:360px){
  :root{--gutter:16px}
  .brand__word{font-size:16px}
  .brand__mark{width:25px;height:25px}
  .lang__button,.lang summary{font-size:11px;padding-inline:3px;gap:3px}
  .btn-login{padding-inline:10px}
  .tools{gap:3px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:0s!important;animation-duration:0s!important;animation-iteration-count:1!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}