:root{
  --bg:#E9EBFA;
  --bg-panel:#F7F8FF;
  --bg-panel-2:#DCDFF5;
  --border:#C9CDEB;
  --accent:#4433F0;
  --accent-dark:#2A1DB8;
  --text:#14153A;
  --text-muted:#5A5E80;
  --success:#1E9E6A;
  --warn:#C97A14;
  --error:#D23B4C;
  --white:#FFFFFF;
  --hero-top:#F4F5FE;
  --hero-bot:#E3E6F8;
  --accent-soft:#E1DEFD;
  --rose-1:#F4C3D3;
  --rose-2:#EBB0C6;
  --glow-peach:#FFD9C6;
  --glow-rose:#F8C9DC;
  --accent-rgb:68 51 240;
  --text-rgb:20 21 58;
  --white-rgb:255 255 255;
  --success-rgb:30 158 106;
  --flag-hk:#DE2910;
  --flag-jp:#BC002D;
  --flag-us-red:#B22234;
  --flag-us-blue:#3C3B6E;
  --flag-sg:#EE2536;
  --flag-de-black:#1B1B1F;
  --flag-de-red:#DD0000;
  --flag-de-gold:#FFCE00;
  --mask-solid:#000000;
  --clear:transparent;
  --font-display:"Noto Serif SC","Source Han Serif SC","Songti SC","STSong","SimSun",Georgia,"Times New Roman",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;
  --r-window:14px;
  --r-tile:10px;
  --r-sm:7px;
  --r-cell:13px;
  --r-inner:6px;
  --r-address:8px;
  --r-bubble:18px;
  --r-flag:3px;
  --r-pill:999px;
  --r-round:50%;
  --gutter:24px;
  --page-width:1248px;
  --header-height:64px;
  --anchor-offset:80px;
  --toc-offset:88px;
  --section-space:80px;
  --h1-size:68px;
  --h2-size:36px;
  --body-size:16px;
  --shadow-window:0 2px 6px rgb(var(--accent-rgb) / .06),0 34px 80px -16px rgb(var(--accent-rgb) / .12),0 14px 32px -18px rgb(var(--accent-rgb) / .12);
  --shadow-float:0 1px 2px rgb(var(--accent-rgb) / .08),0 18px 36px -12px rgb(var(--accent-rgb) / .16);
  --shadow-cta:0 12px 26px -10px rgb(var(--text-rgb) / .45),inset 0 1px 0 rgb(var(--white-rgb) / .14);
  --shadow-panel:0 24px 60px -24px rgb(var(--accent-rgb) / .12),inset 0 1px 0 var(--white);
  --ease-out:cubic-bezier(.2,.7,.3,1);
  --fast:.2s;
  --reveal-time:.35s;
  --grain-light:.04;
  --grain-band:.3;
  --noise:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='g'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23g)'/%3E%3C/svg%3E");
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:var(--anchor-offset)}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:var(--body-size);line-height:1.6;-webkit-font-smoothing:antialiased}
html.nav-open{overflow:hidden}
[hidden]{display:none!important}
a{color:inherit;text-underline-offset:4px}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
button,select,input,textarea{color:var(--text)}
button{background:var(--bg-panel);border:1px solid var(--border)}
img,video{max-width:100%;height:auto}
svg{flex-shrink:0}
:where(a,button,summary,input,select,textarea,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:4px}
.site-head :where(a,button):focus-visible{outline-color:var(--white)}
h1,h2,h3{overflow-wrap:break-word;text-wrap:balance}
h1{font-family:var(--font-display);font-size:clamp(52px,5vw,var(--h1-size));line-height:1.12;letter-spacing:-.02em;margin:0 0 24px}
h2{font-size:var(--h2-size);line-height:1.25;letter-spacing:-.015em;margin:0 0 24px}
h3{font-size:22px;line-height:1.4;margin:0 0 16px}
p{margin:0 0 20px}
small{font-size:13px}
code{font-family:var(--font-mono);overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:24px;background:var(--bg-panel-2);border-radius:var(--r-sm)}
pre code{overflow-wrap:normal;white-space:pre}
table{border-collapse:collapse}
th{text-align:left}
input,textarea,select{max-width:100%;padding:12px;border:1px solid var(--border);border-radius:var(--r-sm);background:var(--white)}
.wrap{width:100%;max-width:var(--page-width);padding-inline:var(--gutter);margin-inline:auto}
.section{padding-top:var(--section-space);padding-bottom:var(--section-space)}
.reading-wrap{max-width:880px}
.prose{min-width:0;overflow-wrap:break-word}
.prose h2{margin-top:48px}
.prose h3{margin-top:32px}
.prose li{margin-bottom:10px}
.prose :first-child{margin-top:0}
.no-break{white-space:nowrap}
.muted{color:var(--text-muted)}
.kw{color:var(--accent)}
.center{text-align:center}
.grid{display:grid;gap:24px}
.grid--three{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--five{grid-template-columns:repeat(5,minmax(0,1fr))}
.grid>*,.panel>*,.feature-browser>*,.footer-grid>*{min-width:0}
.surface{padding:28px;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--r-window);box-shadow:var(--shadow-panel)}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.icon{width:24px;height:24px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.btn,.btn-primary,.btn-ghost,.btn-login{display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;white-space:nowrap;text-decoration:none;font-weight:600;border-radius:var(--r-pill);transition:transform var(--fast),background var(--fast)}
.btn{min-height:44px;padding:10px 22px;gap:8px;border:1px solid var(--border);background:var(--white);color:var(--text)}
.btn-primary{gap:14px;height:54px;padding:6px 22px 6px 6px;background:var(--text);color:var(--white);font-size:17px;letter-spacing:.01em;box-shadow:var(--shadow-cta);border:0}
.btn-primary .ico-cell{display:grid;place-items:center;width:42px;height:42px;border-radius:var(--r-cell);background:var(--white);box-shadow:inset 0 -2px 0 rgb(var(--accent-rgb) / .1);color:var(--accent)}
.btn-primary .ico-cell svg{width:24px;height:24px}
.btn-primary .arrow{width:20px;height:20px;fill:none;stroke:rgb(var(--white-rgb) / .7);stroke-width:1.8}
.btn-ghost{height:54px;padding:0 28px;background:var(--white);color:var(--text);font-size:16px;box-shadow:inset 0 0 0 1px var(--border),0 6px 16px -12px rgb(var(--accent-rgb) / .4);border:0}
.btn:hover,.btn-primary:hover,.btn-ghost:hover{transform:translateY(-2px)}
.btn:active,.btn-primary:active,.btn-ghost:active{transform:translateY(0)}
.btn:disabled,.btn-primary:disabled,.btn-ghost:disabled{opacity:.5;cursor:not-allowed;transform:none}
.btn.is-hover{background:var(--bg-panel-2)}
.btn.is-active{background:var(--accent-soft);border-color:var(--accent)}
.btn.is-focus{outline:2px solid var(--accent);outline-offset:4px}
.cta-row{display:flex;justify-content:center;align-items:center;flex-wrap:wrap;gap:14px;margin-top:26px}
.site-head{position:relative;z-index:100;background:var(--accent);color:var(--white)}
.site-head::before{content:"";position:absolute;inset:0;background-image:var(--noise);mix-blend-mode:overlay;opacity:var(--grain-band);pointer-events:none}
.tear{position:absolute;left:0;right:0;height:7px;background:var(--accent);pointer-events:none}
.tear--down{top:100%;-webkit-mask:radial-gradient(circle at 7px -2px,var(--mask-solid) 8px,var(--clear) 8.5px) 0 0/14px 7px repeat-x;mask:radial-gradient(circle at 7px -2px,var(--mask-solid) 8px,var(--clear) 8.5px) 0 0/14px 7px repeat-x}
.tear--up{bottom:100%;-webkit-mask:radial-gradient(circle at 7px 9px,var(--mask-solid) 8px,var(--clear) 8.5px) 0 0/14px 7px repeat-x;mask:radial-gradient(circle at 7px 9px,var(--mask-solid) 8px,var(--clear) 8.5px) 0 0/14px 7px repeat-x}
.head-inner{position:relative;z-index:3;display:flex;align-items:center;flex-wrap:nowrap;gap:36px;height:var(--header-height)}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;font-weight:700;font-size:19px;letter-spacing:-.01em;white-space:nowrap;flex-shrink:0}
.brand img{width:30px;height:30px;flex-shrink:0}
.desktop-nav{flex:1;min-width:0}
.nav-links{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:26px}
.nav-links a{display:inline-flex;align-items:center;min-height:36px;text-decoration:none;font-size:15px;font-weight:500;color:rgb(var(--white-rgb) / .8);white-space:nowrap;transition:transform var(--fast)}
.nav-links a:hover{transform:translateY(-1px);color:var(--white)}
.nav-links a[aria-current="page"]{color:var(--white);font-weight:700}
.head-tools{margin-left:auto;display:flex;align-items:center;gap:20px;flex-shrink:0}
.btn-login{height:36px;padding:0 20px;background:var(--white);color:var(--text);font-size:14px;box-shadow:0 6px 16px -8px rgb(var(--text-rgb) / .5),inset 0 -1px 0 rgb(var(--accent-rgb) / .12)}
.btn-login:hover{transform:translateY(-1px)}
.language{position:relative}
.language-button{display:inline-flex;align-items:center;justify-content:center;gap:4px;min-width:44px;min-height:36px;width:auto;padding:4px 0;color:rgb(var(--white-rgb) / .85);background:var(--clear);border:0;font-size:14px;white-space:nowrap}
.language-button span{white-space:nowrap}
.language-panel{position:absolute;z-index:110;right:0;top:calc(100% + 12px);min-width:172px;padding:8px;background:var(--bg-panel);color:var(--text);border:1px solid var(--border);border-radius:var(--r-tile);box-shadow:var(--shadow-float)}
.language-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;text-decoration:none;border-radius:var(--r-sm)}
.language-panel a:hover,.language-panel a[aria-current="true"]{background:var(--bg-panel-2)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:5px;min-width:44px;min-height:44px;padding:8px;background:var(--clear);border:1px solid rgb(var(--white-rgb) / .45);color:var(--white);border-radius:var(--r-sm)}
.menu-line{display:block;width:20px;height:2px;background:currentColor;flex-shrink:0}
.mobile-drawer{display:none;position:fixed;z-index:102;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;padding:20px var(--gutter) 40px;background:var(--bg-panel);color:var(--text)}
.mobile-drawer.is-open{display:block}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;text-decoration:none;border-radius:var(--r-sm)}
.mobile-drawer a:hover,.mobile-drawer a[aria-current]{background:var(--bg-panel-2)}
.drawer-languages{border-top:1px solid var(--border);padding-top:16px;margin-top:16px}
.nav-veil{position:fixed;z-index:101;inset:var(--header-height) 0 0;background:rgb(var(--text-rgb) / .3);display:none}
.nav-veil.is-open{display:block}
.site-footer{background:var(--bg-panel-2);border-top:1px solid var(--border);padding-top:56px;padding-bottom:28px}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:48px}
.footer-brand p{max-width:320px;margin:20px 0;color:var(--text-muted)}
.footer-title{font-size:15px;margin:0 0 16px;font-weight:700}
.footer-links{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 20px}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:28px;text-decoration:none;font-size:14px}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{text-decoration:underline}
.footer-languages{display:flex;flex-wrap:wrap;gap:12px 24px;margin-top:40px;padding-top:24px;border-top:1px solid var(--border)}
.footer-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:16px;margin-top:24px;font-size:13px;color:var(--text-muted)}
.footer-legal{display:flex;gap:24px;flex-wrap:wrap}
.reveal{transition:opacity var(--reveal-time) var(--ease-out),transform var(--reveal-time) 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%;overflow:hidden;margin-top:24px;margin-bottom:32px}
#server-status+*{margin-top:32px}
.decor-region{position:relative;overflow-x:clip}
.counter-stat{display:inline-block;min-width:3ch;font-variant-numeric:tabular-nums;font-family:var(--font-mono)}
.counter-stat[data-count="250"]{min-width:3ch}
@media(max-width:1200px){
  .head-inner{gap:24px}
  .nav-links{gap:18px}
  .head-tools{gap:14px}
}
@media(max-width:1050px){
  .desktop-nav{display:none}
  .head-tools{margin-left:auto}
  .menu-toggle{display:inline-flex}
  .footer-grid{gap:28px}
  .grid--five{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media(min-width:1051px){
  .mobile-drawer.is-open,.nav-veil.is-open{display:none}
}
@media(max-width:768px){
  :root{--section-space:48px;--h2-size:28px}
  h1{font-size:36px;line-height:1.18}
  h3{font-size:20px}
  .grid--three,.grid--five{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1/-1}
  .cta-row{flex-direction:column;align-items:stretch;max-width:320px;margin-inline:auto}
  .cta-row .btn-primary,.cta-row .btn-ghost{justify-content:center}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .tilt,.tilt-decor{transform:none}
  .decor-region,.glow{max-width:100%}
  .head-inner{gap:8px}
  .head-tools{gap:8px;margin-left:auto}
  .brand{font-size:16px;gap:6px}
  .brand img{width:26px;height:26px}
  .btn-login{padding-inline:13px;font-size:13px}
  .language-button{font-size:12px}
  .menu-toggle{min-width:44px}
  .surface{padding:20px}
  .grid--three,.grid--five,.footer-grid{grid-template-columns:1fr}
  .footer-brand{grid-column:auto}
  .footer-grid{gap:32px}
  .footer-bottom{flex-direction:column}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}