:root{
  color-scheme:light;
  --bg:#FAFAF9;--bg-panel:#FFFFFF;--bg-panel-2:#F2F2F0;--border:#E6E5E1;
  --accent:#F2542D;--accent-dark:#C7391A;--text:#141414;--text-muted:#6B6B68;
  --success:#1FA971;--warn:#E8A100;--error:#D93025;
  --grape:#7B61FF;--lemon:#FFD23F;--mint:#1FB98A;--sakura:#FF8AC7;
  --ink:#141414;--ink-soft:#2B2B29;--on-ink:#FFFFFF;
  --accent-rgb:242 84 45;--grape-rgb:123 97 255;--lemon-rgb:255 210 63;
  --mint-rgb:31 185 138;--sakura-rgb:255 138 199;--ink-rgb:20 20 20;--white-rgb:255 255 255;
  --tomato-face-a:#F8A893;--tomato-face-b:#FDD8C6;
  --grape-face-a:#D3CBFF;--grape-face-b:#EEEAFF;
  --lemon-face-a:#FFE79C;--lemon-face-b:#FFF6D6;
  --mint-face-a:#BFEBDD;--mint-face-b:#E4F7F1;
  --sakura-face-a:#FFC4E3;--sakura-face-b:#FFE8F4;--sakura-mid:#FFA9D6;
  --grape-tag:#E7E2FF;--lemon-tag:#FFF0B8;--mint-tag:#D4F2E8;--sakura-tag:#FFE0F0;--grape-bar:#CAC0FF;
  --dot-1:#F7A893;--dot-2:#FFDF85;--dot-3:#8FDBC2;
  --flag-red:#DA2B34;--flag-blue:#253C8C;--flag-white:#FFFFFF;
  --veil:rgb(20 20 20 / .28);
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Yu Gothic","Malgun Gothic","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Yu Gothic","Malgun Gothic","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --radius-xs:4px;--radius-sm:6px;--radius-win:8px;--radius:10px;--radius-card:10px;--radius-pill:999px;--radius-round:50%;
  --edge:inset 0 0 0 1px rgb(var(--white-rgb) / .55),inset 0 1px 0 rgb(var(--white-rgb) / .92);
  --shadow-tomato:0 34px 68px -18px rgb(var(--accent-rgb) / .12),0 10px 22px -12px rgb(var(--accent-rgb) / .10);
  --shadow-grape:0 34px 68px -18px rgb(var(--grape-rgb) / .12),0 10px 22px -12px rgb(var(--grape-rgb) / .10);
  --shadow-lemon:0 34px 68px -18px rgb(var(--lemon-rgb) / .12),0 10px 22px -12px rgb(var(--lemon-rgb) / .12);
  --shadow-mint:0 34px 68px -18px rgb(var(--mint-rgb) / .12),0 10px 22px -12px rgb(var(--mint-rgb) / .10);
  --shadow-sakura:0 34px 68px -18px rgb(var(--sakura-rgb) / .12),0 10px 22px -12px rgb(var(--sakura-rgb) / .12);
  --shadow-menu:0 24px 48px -16px rgb(var(--grape-rgb) / .18),0 2px 6px rgb(var(--ink-rgb) / .06),inset 0 0 0 1px var(--border);
  --shadow-ink:0 18px 34px -14px rgb(var(--ink-rgb) / .55),inset 0 1px 0 rgb(var(--white-rgb) / .14);
  --shadow-window:0 1px 1px rgb(var(--ink-rgb) / .04),0 12px 24px -16px rgb(var(--ink-rgb) / .3);
  --shadow-panel:0 24px 56px -24px rgb(var(--grape-rgb) / .12),var(--edge);
  --gutter:40px;--page-width:1320px;--nav-height:68px;--drawer-top:68px;--anchor-offset:88px;--toc-offset:16px;
  --space-1:8px;--space-2:16px;--space-3:24px;--space-4:32px;--space-5:48px;--space-6:64px;--space-7:96px;
  --text-xs:12px;--text-sm:14px;--text-base:16px;--text-lead:20px;
  --size-h1:clamp(52px,4.85vw,66px);--size-h2:clamp(32px,3.1vw,44px);--size-h3:24px;
  --weight-display:900;--weight-regular:400;--weight-medium:500;--weight-bold:700;
  --tracking-display:-.03em;--tracking-cjk:-.02em;--ease:cubic-bezier(.2,.7,.2,1);--fast:.2s;--reveal-time:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:var(--anchor-offset)}
html.nav-open{overflow:hidden}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:var(--text-base);line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:clip}
[hidden]{display:none!important}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
button:disabled{cursor:not-allowed}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
p{margin:0}
ul,ol{padding-left:1.5em}
h1,h2,h3,h4{font-family:var(--font-display);color:var(--text);margin:0 0 var(--space-3);overflow-wrap:break-word}
h1,.h1{font-size:var(--size-h1);font-weight:var(--weight-display);line-height:1.1;letter-spacing:var(--tracking-display)}
:lang(zh) h1,:lang(ja) h1,:lang(ko) h1{letter-spacing:var(--tracking-cjk)}
h2{font-size:var(--size-h2);font-weight:var(--weight-regular);line-height:1.25;letter-spacing:var(--tracking-cjk)}
h3{font-size:var(--size-h3);font-weight:var(--weight-medium);line-height:1.4}
small{font-size:var(--text-xs)}
strong{font-weight:var(--weight-bold)}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--radius-sm)}
::selection{background:var(--lemon-tag);color:var(--ink)}
.no-break{white-space:nowrap}
.wrap{max-width:var(--page-width);margin-inline:auto;padding-inline:var(--gutter);width:100%}
.sec{padding-top:var(--space-7);padding-bottom:var(--space-7)}
.grid{display:grid;gap:var(--space-3)}
.grid>*{min-width:0}
.two-col{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:var(--space-5)}
.two-col>*{min-width:0}
.stack>*+*{margin-top:var(--space-3)}
.muted{color:var(--text-muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.panel{padding:var(--space-4);border-radius:var(--radius);background:var(--bg-panel);box-shadow:var(--shadow-panel)}
.panel-sunken{background:var(--bg-panel-2);border-radius:var(--radius);padding:var(--space-3)}
.text-link{display:inline-flex;align-items:center;gap:var(--space-1);min-height:24px;text-decoration:underline;text-underline-offset:5px}
.prose{max-width:76ch;overflow-wrap:break-word}
.prose p,.prose ul,.prose ol,.prose pre,.prose blockquote{margin-block:0 var(--space-3)}
.prose h2{margin-top:var(--space-6)}
.prose h3{margin-top:var(--space-4)}
.prose a{text-decoration:underline;text-underline-offset:3px}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:var(--space-3);background:var(--bg-panel-2);border-radius:var(--radius-win)}
pre code{white-space:pre;overflow-wrap:normal}
hr{border:0;border-top:1px solid var(--border);margin-block:var(--space-4)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.btn,.btn-primary,.btn-secondary{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:52px;padding:12px 28px;border-radius:var(--radius-pill);font-size:var(--text-base);font-weight:600;letter-spacing:.01em;white-space:nowrap;flex-shrink:0;transition:transform var(--fast),box-shadow var(--fast),background-color var(--fast)}
.btn svg,.btn-primary svg,.btn-secondary svg{width:18px;height:18px;transition:transform var(--fast)}
.btn-ink,.btn-primary{background:var(--ink);color:var(--on-ink);box-shadow:var(--shadow-ink)}
.btn-ink:hover,.btn-primary:hover{background:var(--ink-soft);transform:translateY(-1px)}
.btn-ink:hover svg{transform:translateX(2px)}
.btn-line,.btn-secondary{background:rgb(var(--white-rgb) / .7);color:var(--ink);box-shadow:inset 0 0 0 1px rgb(var(--ink-rgb) / .2)}
.btn-line:hover,.btn-secondary:hover{background:var(--bg-panel);box-shadow:inset 0 0 0 1px rgb(var(--ink-rgb) / .5)}
.btn:active,.btn-primary:active,.btn-secondary:active{transform:translateY(1px)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.45;box-shadow:none;pointer-events:none}
.btn-mini{display:inline-flex;align-items:center;justify-content:center;min-height:30px;padding:4px 14px;border-radius:var(--radius-sm);background:var(--ink);color:var(--on-ink);font-size:13px;font-weight:600;white-space:nowrap}
.btn-mini:hover{background:var(--ink-soft)}
.cta-row{display:flex;flex-wrap:wrap;gap:12px}
.bar{background:linear-gradient(90deg,var(--grape-bar),var(--grape-face-a));color:var(--ink);position:relative;z-index:30}
.bar-in{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:24px;min-height:44px}
.bar-logo{display:inline-flex;align-items:center;gap:8px;font:800 15px/1 var(--font-display);letter-spacing:-.02em}
.bar-logo img{width:22px;height:22px}
.bar-msg{font-size:14px;font-weight:500;letter-spacing:.01em}
.dot-sep{margin-inline:10px;color:rgb(var(--ink-rgb) / .45)}
.bar-act{justify-self:end;display:flex;align-items:center;gap:10px}
.bar-x{display:grid;place-items:center;min-width:28px;min-height:28px;border-radius:var(--radius-round);cursor:pointer}
.bar-x:hover{background:rgb(var(--white-rgb) / .45)}
.bar-x svg{width:14px;height:14px}
.bar-off{position:absolute;width:1px;height:1px;margin:0;opacity:0}
.bar-off:checked+.bar{display:none}
.bar-off:focus-visible+.bar .bar-x{outline:2px solid var(--accent);outline-offset:2px}
#site-header{position:relative;z-index:50}
.nav{position:relative;z-index:50;border-bottom:1px solid var(--border);background:rgb(var(--white-rgb) / .55);backdrop-filter:saturate(1.2) blur(10px)}
.nav-in{display:flex;align-items:center;gap:40px;height:var(--nav-height);flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:10px;font:900 21px/1 var(--font-display);letter-spacing:-.03em;color:var(--ink);white-space:nowrap;flex-shrink:0}
.brand img{width:30px;height:30px}
.brand-zh{font-weight:500;color:var(--text-muted);font-size:var(--text-sm)}
.desktop-nav{flex:1;min-width:0}
.nav-list{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:2px}
.nav-list>li>a,.nav-more-btn{position:relative;display:inline-flex;align-items:center;gap:4px;height:38px;padding:0 14px;border-radius:var(--radius-pill);font-size:15px;font-weight:500;white-space:nowrap}
.nav-list>li>a:hover,.nav-more-btn:hover{background:rgb(var(--ink-rgb) / .05)}
.nav-list a[aria-current="page"],.nav-more-btn.is-current{font-weight:700}
.nav-list>li>a[aria-current="page"]::after{content:"";position:absolute;left:50%;bottom:3px;width:16px;height:2px;margin-left:-8px;border-radius:var(--radius-xs);background:var(--ink)}
.nav-more{position:relative}
.nav-more-btn svg{width:12px;height:12px;transition:transform var(--fast)}
.nav-more.is-open .nav-more-btn svg{transform:rotate(180deg)}
.nav-menu{position:absolute;top:calc(100% + 8px);left:0;min-width:188px;padding:8px;list-style:none;margin:0;border-radius:var(--radius);background:var(--bg-panel);box-shadow:var(--shadow-menu);z-index:70}
.nav-menu a{display:flex;align-items:center;gap:10px;min-height:38px;padding:8px 12px;border-radius:var(--radius-sm);font-size:14px;font-weight:500}
.nav-menu a:hover,.nav-menu a[aria-current="page"]{background:var(--bg-panel-2)}
.nav-menu i{width:8px;height:8px;border-radius:var(--radius-xs);flex:none}
.nav-menu li:nth-child(1) i{background:var(--lemon-face-a)}
.nav-menu li:nth-child(2) i{background:var(--mint-face-a)}
.nav-menu li:nth-child(3) i{background:var(--grape-face-a)}
.nav-menu li:nth-child(4) i{background:var(--sakura-face-a)}
.nav-tools{margin-left:auto;display:flex;align-items:center;gap:8px;flex-shrink:0}
.lang-wrap{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;height:38px;padding:0 12px;border-radius:var(--radius-pill);font-size:14px;color:var(--text-muted);width:auto;min-width:44px}
.lang span{white-space:nowrap}
.lang:hover{background:rgb(var(--ink-rgb) / .05)}
.lang svg{width:16px;height:16px}
.lang .caret{width:10px;height:10px}
.lang-panel{position:absolute;right:0;top:calc(100% + 10px);width:180px;padding:8px;background:var(--bg-panel);border-radius:var(--radius);box-shadow:var(--shadow-menu);z-index:80}
.lang-panel a{display:flex;align-items:center;min-height:40px;padding:8px 12px;border-radius:var(--radius-sm);font-size:14px}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--grape-tag)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;height:38px;padding:0 20px;border-radius:var(--radius-pill);background:var(--bg-panel);box-shadow:inset 0 0 0 1px rgb(var(--ink-rgb) / .18),0 1px 2px rgb(var(--ink-rgb) / .06);font-size:14px;font-weight:600;white-space:nowrap}
.btn-login:hover{box-shadow:inset 0 0 0 1px rgb(var(--ink-rgb) / .5)}
.nav-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;border-radius:var(--radius-sm)}
.nav-toggle-line{display:block;width:20px;height:2px;background:currentColor}
.mobile-drawer{position:fixed;top:var(--drawer-top);right:0;left:0;height:calc(100dvh - var(--drawer-top));max-height:calc(100dvh - var(--drawer-top));overflow-y:auto;overscroll-behavior:contain;background:var(--bg-panel);padding:16px var(--gutter) 32px;z-index:49}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;border-radius:var(--radius-sm)}
.mobile-drawer a:hover,.mobile-drawer a[aria-current="page"]{background:var(--bg-panel-2)}
.drawer-languages{border-top:1px solid var(--border);padding-top:16px;margin-top:16px}
.nav-veil{position:fixed;inset:var(--drawer-top) 0 0;background:var(--veil);z-index:48}
.site-footer{border-top:1px solid var(--border);background:var(--bg-panel-2);padding-top:var(--space-6);padding-bottom:var(--space-4)}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:var(--space-5)}
.footer-grid>*{min-width:0}
.footer-brand p{margin-top:var(--space-3);max-width:32ch;color:var(--text-muted);font-size:var(--text-sm)}
.footer-title{font-size:var(--text-sm);font-weight:700;margin-bottom:var(--space-2)}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 16px;list-style:none;margin:0;padding:0;font-size:var(--text-sm)}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:28px}
.footer-links a:hover,.footer-legal a:hover{text-decoration:underline;text-underline-offset:4px}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 24px;margin-top:var(--space-5);font-size:var(--text-sm)}
.footer-languages a[aria-current="true"]{font-weight:700}
.footer-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:16px;margin-top:var(--space-3);padding-top:var(--space-3);border-top:1px solid var(--border);font-size:var(--text-xs);color:var(--text-muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:var(--space-3)}
.reveal{transition:opacity var(--reveal-time) var(--ease),transform var(--reveal-time) var(--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:var(--space-3) var(--space-4)}
#server-status+*{margin-top:var(--space-4)}
#server-status>*{min-width:0;max-width:100%}
@media(min-width:961px){.mobile-drawer,.nav-veil{display:none!important}}
@media(max-width:1100px){
  .nav-in{gap:24px}
  .nav-list>li>a,.nav-more-btn{padding-inline:10px}
}
@media(max-width:960px){
  .desktop-nav{display:none}
  .nav-tools{margin-left:auto}
  .nav-toggle{display:flex}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1/-1}
}
@media(max-width:768px){
  :root{--gutter:24px;--size-h1:clamp(28px,5.2vw,40px);--size-h2:32px;--space-7:64px}
  .two-col{grid-template-columns:minmax(0,1fr)}
  .bar-in{grid-template-columns:1fr auto;gap:8px;padding-block:8px}
  .bar-logo{display:none}
  .bar-msg{font-size:12px}
  .bar-msg .dot-sep{margin-inline:4px}
  .bar-act{gap:4px}
  .bar-act .btn-mini{font-size:12px;padding-inline:10px}
  .nav-in{gap:12px}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .tilt,.tilt-card{transform:none}
  .panel{padding:var(--space-3)}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:32px}
  .footer-brand{grid-column:auto}
  .nav-in{gap:8px}
  .brand{font-size:18px;gap:6px}
  .brand img{width:26px;height:26px}
  .nav-tools{gap:2px;margin-left:auto}
  .lang{font-size:12px;padding-inline:6px;gap:4px}
  .lang>svg:first-child{display:none}
  .btn-login{padding-inline:13px;font-size:13px}
  .bar-msg{max-width:100%}
  .bar-act .btn-mini{display:none}
  .sec{padding-top:48px;padding-bottom:48px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}