:root{
  --bg:#F6F6F4;
  --bg-panel:#FFFFFF;
  --bg-panel-2:#EEEEEB;
  --border:#E2E1DC;
  --accent:#D63A78;
  --accent-dark:#A8245A;
  --violet:#7B45D6;
  --text:#17161C;
  --text-muted:#5F5D68;
  --text-faint:#8E8C96;
  --success:#1F9D6A;
  --warn:#B97E0E;
  --error:#C62F2F;
  --on-ink:#FFFFFF;
  --ink-hover:#2C2A33;
  --canvas-top:#FAFAF8;
  --canvas-bottom:#EFEEEA;
  --canvas-edge:rgba(226,225,220,.85);
  --chrome-bg:#F7F6F3;
  --panel-edge:rgba(226,225,220,.9);
  --sheet-bg:rgba(255,255,255,.72);
  --rose-a05:rgba(214,58,120,.05);
  --rose-a07:rgba(214,58,120,.07);
  --rose-a10:rgba(214,58,120,.10);
  --rose-a12:rgba(214,58,120,.12);
  --rose-a30:rgba(214,58,120,.30);
  --rose-a45:rgba(214,58,120,.45);
  --violet-a06:rgba(123,69,214,.06);
  --ink-a06:rgba(23,22,28,.06);
  --ink-a12:rgba(23,22,28,.12);
  --veil:rgba(23,22,28,.36);
  --white-a20:rgba(255,255,255,.20);
  --white-a80:rgba(255,255,255,.80);
  --white-a95:rgba(255,255,255,.95);
  --flag-red:#C8102E;
  --flag-navy:#1E2A6E;
  --flag-white:#FFFFFF;
  --flag-black:#1A1A1C;
  --flag-gold:#F2C230;
  --flag-edge:rgba(23,22,28,.14);
  --clear:transparent;
  --r-canvas:20px;
  --r-panel:14px;
  --r-md:8px;
  --r-sm:6px;
  --r-xs:4px;
  --r-round:50%;
  --font-display:"Inter","Noto Sans SC","PingFang SC","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;
  --weight-display:900;
  --gutter:40px;
  --content-width:1440px;
  --header-height:72px;
  --anchor-offset:92px;
  --toc-offset:156px;
  --shadow-panel:0 52px 96px -36px rgba(214,58,120,.12),0 24px 48px -28px rgba(214,58,120,.12),0 14px 28px -20px rgba(23,22,28,.10),inset 0 1px 0 #FFFFFF;
  --shadow-sheet:0 36px 64px -34px rgba(214,58,120,.12);
  --shadow-grad:0 24px 40px -20px rgba(168,36,90,.42),inset 0 1px 0 rgba(255,255,255,.28);
  --shadow-card:0 26px 48px -22px rgba(214,58,120,.16),0 6px 14px -10px rgba(23,22,28,.10),inset 0 1px 0 #FFFFFF;
  --shadow-row-on:0 12px 24px -16px rgba(214,58,120,.45);
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:var(--anchor-offset)}
html,body{margin:0}
body{background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:16px;line-height:1.5;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
[hidden]{display:none!important}
h1,h2,h3,h4,p,ul,ol,blockquote,figure{margin:0}
h1,h2,h3{font-family:var(--font-display);overflow-wrap:break-word;text-wrap:balance}
h1{font-size:clamp(52px,4.72vw,68px);line-height:1.12;font-weight:var(--weight-display);letter-spacing:-.02em}
h2{font-size:34px;line-height:1.2;font-weight:var(--weight-display);letter-spacing:-.02em}
h3{font-size:22px;line-height:1.35;font-weight:750}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
button:disabled{cursor:not-allowed}
button,input,select,textarea{color:var(--text)}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--r-sm)}
img{max-width:100%;height:auto}
svg{flex-shrink:0}
:where(main,section,article,aside,nav,div){min-width:0}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;border-radius:var(--r-md);background:var(--text);color:var(--on-ink);font-family:var(--font-mono);font-size:13px;line-height:1.8}
pre code{overflow-wrap:normal;white-space:pre}
.no-break{white-space:nowrap}
.wrap,.rb-wrap{width:100%;max-width:var(--content-width);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:64px;padding-bottom:64px}
.stack{display:grid;gap:24px}
.grid-three{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.mono{font-family:var(--font-mono)}
.muted{color:var(--text-muted)}
.panel,.card{padding:24px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--bg-panel);box-shadow:inset 0 1px 0 var(--white-a95)}
.panel{border-radius:var(--r-panel);box-shadow:var(--shadow-sheet)}
.prose{max-width:880px;line-height:1.85;overflow-wrap:anywhere}
.prose :where(p,ul,ol,pre,blockquote,table){margin-block:20px}
.prose :where(h2,h3){margin-top:40px;margin-bottom:16px}
.prose :where(ul,ol){padding-left:24px}
.prose a{color:var(--accent-dark);text-decoration:underline;text-underline-offset:3px}
.prose section[id]{scroll-margin-top:var(--anchor-offset)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:52px;padding:0 24px;border-radius:var(--r-md);font-size:16px;font-weight:700;letter-spacing:-.005em;white-space:nowrap;flex-shrink:0;transition:background .15s,color .15s;border:1px solid var(--text)}
.btn svg{width:16px;height:16px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.btn-ink,.btn-primary{background:var(--text);color:var(--on-ink)}
.btn-ink:hover,.btn-primary:hover,.btn-demo-hover{background:var(--ink-hover)}
.btn-line,.btn-secondary{background:var(--clear);color:var(--text)}
.btn-line:hover,.btn-secondary:hover{background:var(--bg-panel)}
.btn:active{background:var(--bg-panel-2);color:var(--text)}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--bg-panel-2);color:var(--text-muted);border-color:var(--border);cursor:not-allowed}
.btn-small{min-height:40px;padding-inline:16px;font-size:14px}
.btn-demo-focus{outline:2px solid var(--accent);outline-offset:3px}
.rb-top,#site-header{position:relative;z-index:50}
.rb-nav{height:var(--header-height);display:flex;align-items:center;gap:32px;flex-wrap:nowrap;position:relative;z-index:53;background:var(--bg)}
.rb-brand{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:var(--weight-display);font-size:20px;letter-spacing:-.02em;white-space:nowrap}
.rb-brand-zh{font-weight:500;color:var(--text-muted)}
.rb-logo{width:32px;height:32px;flex:none;display:block}
.rb-links{margin-left:auto;flex:1;min-width:0;font-size:14.5px;font-weight:500;color:var(--text-muted)}
.rb-links ul{display:flex;align-items:center;justify-content:flex-end;list-style:none;margin:0;padding:0;gap:26px}
.rb-links a{display:inline-flex;align-items:center;min-height:32px;white-space:nowrap}
.rb-links a:hover{color:var(--text)}
.rb-links a[aria-current="page"]{color:var(--text);font-weight:700}
.rb-tools{display:flex;align-items:center;gap:16px;padding-left:22px;border-left:1px solid var(--border);flex-shrink:0}
.rb-language{position:relative}
.rb-lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:36px;width:auto;padding:0;border:0;background:var(--clear);font-size:14px;font-weight:500;color:var(--text-muted);white-space:nowrap}
.rb-lang svg{width:15px;height:15px}
.rb-lang-text{white-space:nowrap}
.rb-language-panel{position:absolute;top:calc(100% + 8px);right:0;min-width:176px;padding:8px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--bg-panel);box-shadow:var(--shadow-card);z-index:60}
.rb-language-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-sm)}
.rb-language-panel a:hover,.rb-language-panel a[aria-current="true"]{background:var(--bg-panel-2)}
.rb-login{display:inline-flex;align-items:center;justify-content:center;height:36px;padding:0 16px;border:0;border-radius:var(--r-md);background:var(--text);color:var(--on-ink);font-size:14px;font-weight:600;white-space:nowrap}
.rb-login:hover{background:var(--ink-hover)}
.rb-menu{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;padding:8px;border:1px solid var(--border);border-radius:var(--r-sm);background:var(--bg-panel)}
.rb-menu-line{display:block;width:20px;height:2px;background:currentColor}
.rb-drawer{position:fixed;top:var(--header-height);right:0;left:0;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));padding:16px var(--gutter) 32px;background:var(--bg-panel);overflow-y:auto;overscroll-behavior:contain;z-index:52}
.rb-drawer ul{list-style:none;margin:0;padding:0}
.rb-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 8px;border-bottom:1px solid var(--border)}
.rb-drawer a[aria-current="page"]{color:var(--accent-dark);font-weight:700}
.rb-drawer-languages{margin-top:24px;border-top:1px solid var(--border)}
.rb-veil{position:fixed;inset:var(--header-height) 0 0;background:var(--veil);border:0;z-index:51}
html.nav-open{overflow:hidden}
.rb-footer{margin-top:48px;border-top:1px solid var(--border);background:linear-gradient(180deg,var(--canvas-top),var(--canvas-bottom));padding-top:48px;padding-bottom:24px}
.rb-footer-grid{display:grid;grid-template-columns:1.3fr 1.2fr 1fr;gap:48px}
.rb-footer-intro{max-width:340px;margin-top:16px;color:var(--text-muted);line-height:1.8}
.rb-footer-title{font-size:14px;font-weight:700;margin-bottom:12px}
.rb-footer-list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px 20px;list-style:none;padding:0}
.rb-footer-list a,.rb-footer-languages a,.rb-footer-legal a{display:inline-flex;align-items:center;min-height:32px;font-size:14px;color:var(--text-muted)}
.rb-footer a:hover{color:var(--accent-dark)}
.rb-footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:32px}
.rb-footer-bottom{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px;margin-top:24px;padding-top:20px;border-top:1px solid var(--border);font-size:13px;color:var(--text-muted)}
.rb-footer-legal{display:flex;flex-wrap:wrap;gap:20px}
.reveal{transition:opacity .35s ease,transform .35s ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-height:120px;overflow:hidden;max-width:100%;margin-block:24px}
#server-status+*{margin-top:24px}
.svg-defs{position:absolute;width:0;height:0;overflow:hidden}
@media(max-width:1380px){
  .rb-nav{gap:22px}
  .rb-links ul{gap:18px}
  .rb-tools{gap:12px;padding-left:16px}
}
@media(max-width:1200px){
  .rb-links{display:none}
  .rb-tools{margin-left:auto}
  .rb-menu{display:inline-flex}
}
@media(max-width:768px){
  :root{--gutter:16px;--header-height:64px;--anchor-offset:80px;--toc-offset:144px}
  h1{font-size:36px}
  h2{font-size:26px}
  .section{padding-top:40px;padding-bottom:40px}
  .grid-three{grid-template-columns:1fr}
  .rb-nav{gap:16px}
  .rb-tools{margin-left:auto;padding-left:0;border-left:0;gap:10px}
  .rb-footer-grid{grid-template-columns:1fr;gap:28px}
  .rb-footer-bottom{align-items:flex-start;flex-direction:column}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .tilt,.rb-device,.rb-float{transform:none}
  [data-parallax-decor]{max-width:100%}
}
@media(max-width:520px){
  .rb-lang-text{display:none}
  .rb-lang{min-width:28px}
  .rb-brand{font-size:18px;gap:7px}
  .rb-brand-zh{font-size:13px}
  .rb-tools{gap:7px}
  .rb-login{padding-inline:12px}
  .rb-logo{width:28px;height:28px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}