:root {
  --c-bg:#FCFCFE;
  --c-panel:#F5F6FB;
  --c-panel-2:#EDEFF7;
  --c-border:#E3E5EF;
  --c-accent:#5B4CE8;
  --c-accent-dark:#3E30C4;
  --c-leaf:#74C083;
  --c-pine:#17533A;
  --c-text:#14151F;
  --c-muted:#5E6275;
  --c-success:#2E9E5B;
  --c-warn:#D9822B;
  --c-error:#D2403A;
  --c-white:#FFFFFF;
  --c-ink:#14151F;
  --c-clear:transparent;
  --c-faint:color-mix(in srgb,var(--c-muted) 70%,var(--c-bg));
  --c-strip:color-mix(in srgb,var(--c-muted) 55%,var(--c-bg));
  --c-accent-tint:color-mix(in srgb,var(--c-accent) 9%,var(--c-white));
  --c-accent-tint-2:color-mix(in srgb,var(--c-accent) 13%,var(--c-white));
  --c-accent-line:color-mix(in srgb,var(--c-accent) 14%,transparent);
  --c-leaf-tint:color-mix(in srgb,var(--c-leaf) 16%,var(--c-white));
  --c-leaf-tint-2:color-mix(in srgb,var(--c-leaf) 26%,var(--c-white));
  --c-leaf-ink:color-mix(in srgb,var(--c-success) 72%,var(--c-text));
  --c-leaf-halo:color-mix(in srgb,var(--c-leaf) 26%,transparent);
  --c-success-tint:color-mix(in srgb,var(--c-success) 14%,var(--c-white));
  --c-topbar:color-mix(in srgb,var(--c-bg) 86%,transparent);
  --c-hl:color-mix(in srgb,var(--c-white) 75%,transparent);
  --c-pattern:color-mix(in srgb,var(--c-white) 22%,transparent);
  --c-fade-0:color-mix(in srgb,var(--c-bg) 0%,transparent);
  --wash-1:color-mix(in srgb,var(--c-accent) 2%,var(--c-bg));
  --wash-2:color-mix(in srgb,var(--c-accent) 4%,var(--c-bg));
  --wash-3:color-mix(in srgb,var(--c-leaf) 7%,var(--c-bg));
  --grid-line:color-mix(in srgb,var(--c-accent) 5%,transparent);
  --glow-a:color-mix(in srgb,var(--c-accent) 11%,transparent);
  --glow-b:color-mix(in srgb,var(--c-leaf) 14%,transparent);
  --shadow-win:0 1px 2px color-mix(in srgb,var(--c-accent) 8%,transparent),0 20px 44px -18px color-mix(in srgb,var(--c-accent) 18%,transparent),0 56px 120px -40px color-mix(in srgb,var(--c-accent) 12%,transparent);
  --shadow-float:0 1px 2px color-mix(in srgb,var(--c-accent) 10%,transparent),0 14px 30px -12px color-mix(in srgb,var(--c-accent) 26%,transparent);
  --shadow-soft:0 1px 2px color-mix(in srgb,var(--c-accent) 8%,transparent);
  --shadow-card:0 12px 36px -22px color-mix(in srgb,var(--c-accent) 14%,transparent),inset 0 1px 0 var(--c-white);
  --shadow-cta:0 10px 22px -10px color-mix(in srgb,var(--c-accent) 60%,transparent),inset 0 1px 0 color-mix(in srgb,var(--c-white) 28%,transparent);
  --flag-red:#D8333E;
  --flag-blue:#22357E;
  --flag-white:#FFFFFF;
  --flag-edge:color-mix(in srgb,var(--c-text) 14%,transparent);
  --f-display:"Inter","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --f-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Microsoft YaHei",system-ui,sans-serif;
  --f-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --weight-regular:400;
  --weight-medium:500;
  --weight-semibold:600;
  --weight-bold:700;
  --r-xs:6px;
  --r-sm:8px;
  --r-md:10px;
  --r-card:12px;
  --r-lg:14px;
  --r-pill:999px;
  --r-circle:50%;
  --r-bubble:12px 12px 12px 4px;
  --gutter:24px;
  --wrap-width:1226px;
  --header-height:64px;
  --anchor-offset:80px;
  --toc-offset:136px;
  --duration-fast:160ms;
  --duration-reveal:600ms;
  --ease-out:cubic-bezier(.2,.7,.2,1);
  --tracking-title:-.02em;
  --tracking-brand:-.01em;
  --text-xs:12px;
  --text-sm:14px;
  --text-base:16px;
  --text-lede:19px;
  --title-size:clamp(52px,5vw,64px);
  --h2-size:clamp(28px,3vw,40px);
  --h3-size:22px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
html.nav-open{overflow:hidden}
body{margin:0;background:var(--c-bg);color:var(--c-text);font-family:var(--f-body);font-size:var(--text-base);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:inherit}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
button:disabled{cursor:not-allowed}
img{max-width:100%;height:auto;display:block}
svg{flex-shrink:0;vertical-align:middle}
[hidden]{display:none!important}
:where(a,button,summary,input,select,textarea,[tabindex]):focus-visible{outline:2px solid var(--c-accent);outline-offset:3px}
::selection{background:var(--c-accent-tint-2);color:var(--c-text)}
h1,h2,h3{font-family:var(--f-display);font-weight:var(--weight-regular);letter-spacing:var(--tracking-title);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--title-size);line-height:1.1;margin:0 0 24px}
h2{font-size:var(--h2-size);line-height:1.25;margin:0 0 24px}
h3{font-size:var(--h3-size);line-height:1.4;margin:0 0 16px}
p{margin:0 0 20px}
code{font-family:var(--f-mono);overflow-wrap:anywhere;background:var(--c-panel-2);border-radius:var(--r-xs);padding:2px 5px}
pre{max-width:100%;overflow-x:auto;padding:20px;border:1px solid var(--c-border);border-radius:var(--r-md);background:var(--c-panel)}
pre code{background:var(--c-clear);padding:0;white-space:pre;overflow-wrap:normal}
.no-break{white-space:nowrap}
.mono{font-family:var(--f-mono);font-variant-numeric:tabular-nums}
.muted{color:var(--c-muted)}
.wrap{width:100%;max-width:var(--wrap-width);margin-inline:auto;padding-inline:var(--gutter);min-width:0}
.section{padding-top:72px;padding-bottom:72px}
.section-head{max-width:820px;margin-bottom:32px}
.section-head p{color:var(--c-muted)}
.prose{max-width:820px;min-width:0;overflow-wrap:break-word}
.prose h2{margin-top:48px}
.prose h3{margin-top:32px}
.prose p,.prose li{line-height:1.85}
.prose :where(ul,ol){padding-left:24px}
.prose a{text-decoration-thickness:1px;text-underline-offset:4px}
.panel,.card{min-width:0;background:var(--c-white);border:1px solid var(--c-border);border-radius:var(--r-card);box-shadow:var(--shadow-card);padding:24px}
.panel-soft{background:var(--c-panel)}
.card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.card-grid>*{min-width:0}
.ico{fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:50px;padding:0 28px;border:1px solid var(--c-clear);border-radius:var(--r-pill);font-size:var(--text-base);font-weight:var(--weight-medium);text-decoration:none;white-space:nowrap;flex-shrink:0;max-width:100%;transition:background var(--duration-fast),box-shadow var(--duration-fast)}
.btn-primary{color:var(--c-white);background:linear-gradient(135deg,var(--c-accent),var(--c-accent-dark));box-shadow:var(--shadow-cta)}
.btn-primary:hover{background:var(--c-accent-dark)}
.btn-primary:active{box-shadow:var(--shadow-soft)}
.btn-ghost,.btn-secondary{color:var(--c-text);background:var(--c-white);border-color:var(--c-text)}
.btn-ghost:hover,.btn-secondary:hover{background:var(--c-panel)}
.btn-dark{background:var(--c-ink);color:var(--c-white)}
.btn-dark:hover{background:var(--c-accent-dark)}
.btn-small{height:44px;padding-inline:20px;font-size:var(--text-sm)}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--c-panel-2);color:var(--c-muted);box-shadow:none;border-color:var(--c-border)}
.notice{display:block;padding:8px 16px;background:var(--c-accent-tint);border-bottom:1px solid var(--c-accent-line);color:var(--c-text);font-size:14px;line-height:20px;text-align:center;text-decoration:none}
.notice strong{font-weight:var(--weight-bold);margin-right:8px}
.notice span{color:var(--c-text)}
.notice:hover span{color:var(--c-accent-dark)}
#site-header{position:sticky;top:0;z-index:30}
.topbar{position:sticky;top:0;z-index:30;background:var(--c-topbar);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--c-border)}
.topbar-in{position:relative;max-width:1320px;margin:0 auto;height:var(--header-height);display:flex;align-items:center;gap:24px;padding:0 24px}
.brand{display:flex;align-items:center;gap:10px;flex:none;color:var(--c-text);text-decoration:none;font-family:var(--f-display);font-size:19px;font-weight:var(--weight-semibold);letter-spacing:var(--tracking-brand);min-height:30px}
.brand img{width:30px;height:30px;flex-shrink:0}
.nav{display:flex;align-items:center;gap:2px;margin:0;padding:0;list-style:none}
.nav a{display:flex;align-items:center;gap:6px;height:36px;padding:0 10px;border-radius:var(--r-pill);color:var(--c-muted);font-size:14.5px;text-decoration:none;white-space:nowrap}
.nav a svg{flex:none;color:var(--c-faint)}
.nav a:hover,.nav a[aria-current="page"]{color:var(--c-text);background:var(--c-panel)}
.nav a[aria-current="page"] svg{color:var(--c-accent)}
.top-actions{margin-left:auto;display:flex;align-items:center;gap:10px;flex:none}
.language-box{position:relative}
.lang{display:flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;height:36px;padding:0 12px;border:0;border-radius:var(--r-pill);background:var(--c-clear);color:var(--c-muted);font:inherit;font-size:14px;cursor:pointer;white-space:nowrap}
.lang span{white-space:nowrap}
.lang:hover{background:var(--c-panel);color:var(--c-text)}
.language-menu{position:absolute;right:0;top:calc(100% + 10px);width:190px;padding:8px;background:var(--c-white);border:1px solid var(--c-border);border-radius:var(--r-md);box-shadow:var(--shadow-float);z-index:33}
.language-menu a{display:flex;align-items:center;min-height:44px;padding:8px 12px;text-decoration:none;border-radius:var(--r-sm)}
.language-menu a:hover,.language-menu a[aria-current]{background:var(--c-accent-tint);color:var(--c-accent-dark)}
.login{display:inline-flex;align-items:center;justify-content:center;height:38px;padding:0 22px;border-radius:var(--r-pill);background:var(--c-ink);color:var(--c-white);font-size:14.5px;font-weight:var(--weight-medium);text-decoration:none;white-space:nowrap}
.login:hover{background:var(--c-accent-dark)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;border:1px solid var(--c-border);border-radius:var(--r-md);background:var(--c-white);color:var(--c-text)}
.mobile-drawer{display:none;position:absolute;top:100%;left:0;right:0;background:var(--c-white);border-bottom:1px solid var(--c-border);padding:16px var(--gutter);max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;box-shadow:var(--shadow-float);z-index:32}
.mobile-drawer a{display:flex;align-items:center;gap:12px;width:100%;min-height:44px;padding:12px 16px;text-decoration:none;border-radius:var(--r-sm);color:var(--c-text)}
.mobile-drawer a:hover,.mobile-drawer a[aria-current]{background:var(--c-accent-tint)}
.drawer-languages{border-top:1px solid var(--c-border);margin-top:12px;padding-top:12px}
.nav-veil{position:fixed;inset:var(--header-height) 0 0;background:var(--c-topbar);z-index:20;border:0}
.footer{background:var(--c-panel);border-top:1px solid var(--c-border);padding-top:48px;padding-bottom:24px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1.2fr;gap:40px}
.footer-grid>*{min-width:0}
.footer-brand p{margin-top:20px;color:var(--c-muted);max-width:360px}
.footer-title{font-size:var(--text-base);font-weight:var(--weight-medium);margin-bottom:12px}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 16px}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:28px;padding-block:3px;color:var(--c-muted);text-decoration:none;overflow-wrap:anywhere}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{color:var(--c-accent-dark);text-decoration:underline;text-underline-offset:4px}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:32px}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;border-top:1px solid var(--c-border);margin-top:24px;padding-top:20px;color:var(--c-muted);font-size:var(--text-sm)}
.footer-bottom p{margin:0}
.footer-legal{display:flex;gap:20px;flex-wrap:wrap}
.reveal{transition:opacity var(--duration-reveal) var(--ease-out),transform var(--duration-reveal) var(--ease-out)}
.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:24px}
#server-status+*{margin-top:24px}
#server-status>*{min-width:0;max-width:100%}
.decor-region{position:relative;isolation:isolate;overflow-x:clip;max-width:100%}
body:has(.toc-tabs) section[id]{scroll-margin-top:var(--toc-offset)}
section[id]{scroll-margin-top:var(--anchor-offset)}
@media(max-width:1180px){
  .desktop-nav{display:none}
  .menu-toggle{display:inline-flex}
  .mobile-drawer:not([hidden]){display:block}
  .top-actions{margin-left:auto}
}
@media(max-width:768px){
  :root{--title-size:38px;--h2-size:30px}
  .card-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1/-1}
  .section{padding-top:48px;padding-bottom:48px}
  h1{font-size:var(--title-size);line-height:1.2}
}
@media(max-width:640px){
  :root{--gutter:16px;--title-size:36px;--h3-size:20px}
  .no-break{white-space:normal}
  .tilt{transform:none!important}
  .decor-region{max-width:100%;overflow-x:clip}
  .topbar-in{padding:0 16px;gap:12px}
  .top-actions{margin-left:auto;gap:4px}
  .lang{padding:0 8px}
  .lang span{display:none}
  .login{padding-inline:16px}
  .footer-grid{grid-template-columns:1fr}
  .footer-brand{grid-column:auto}
  .panel,.card{padding:20px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none;transition:none}
  *,*::before,*::after{animation-duration:0s!important;transition-duration:0s!important}
}