:root{
  --bg:#FAF1E6;
  --bg-panel:#FFFBF6;
  --bg-panel-2:#F3E6D6;
  --border:#E6D5C2;
  --border-strong:#CFBBA6;
  --border-soft:rgb(230 213 194 / .72);
  --accent:#3D5FBF;
  --accent-dark:#26408C;
  --accent-soft:#9DB4E8;
  --text:#2A1F18;
  --text-muted:#6E5D50;
  --success:#2F8A57;
  --warn:#B9741A;
  --error:#B83A2E;
  --apricot:#F6DCC6;
  --ochre-rose:#E7B49A;
  --cobalt-mist:#E4EAF8;
  --ink:#2A1F18;
  --ink-hover:#3B2C21;
  --on-ink:#FFFBF6;
  --ink-glass:rgb(42 31 24 / .8);
  --ink-sheen:rgb(255 251 246 / .12);
  --paper-glass:rgb(255 251 246 / .74);
  --highlight:rgb(255 255 255 / .9);
  --highlight-soft:rgb(255 251 246 / .5);
  --highlight-faint:rgb(255 251 246 / .28);
  --apricot-veil:rgb(246 220 198 / .82);
  --rose-veil:rgb(231 180 154 / .34);
  --accent-haze:rgb(61 95 191 / .14);
  --accent-ring:rgb(61 95 191 / .14);
  --success-ring:rgb(47 138 87 / .16);
  --shadow-cobalt:rgb(61 95 191 / .10);
  --shadow-cobalt-2:rgb(61 95 191 / .06);
  --shadow-cobalt-strong:rgb(61 95 191 / .14);
  --shadow-ink:rgb(42 31 24 / .22);
  --clear:transparent;
  --flag-red:var(--error);
  --flag-blue:var(--accent-dark);
  --flag-white:var(--bg-panel);
  --font-display:Georgia,'Times New Roman','Songti SC','STSong','Noto Serif CJK SC','Source Han Serif SC',serif;
  --font-body:'Inter','Noto Sans SC',-apple-system,'PingFang SC','Microsoft YaHei','Hiragino Sans','Malgun Gothic',system-ui,sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,'SFMono-Regular',Menlo,Consolas,monospace;
  --r-xl:28px;
  --r-lg:16px;
  --r-md:12px;
  --r-pill:999px;
  --r-circle:50%;
  --r-none:0;
  --gutter:32px;
  --wrap:1200px;
  --reading:800px;
  --h1-size:68px;
  --h2-size:38px;
  --h3-size:23px;
  --body-size:16px;
  --section-space:88px;
  --anchor-space:88px;
  --toc-top:12px;
  --toc-landing:100px;
  --ease-time:.2s;
  --panel-shadow:inset 0 1px 0 var(--highlight),inset 0 0 0 1px var(--highlight-soft),0 36px 96px var(--shadow-cobalt),0 8px 24px var(--shadow-cobalt-2);
  --grain:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='g'><feTurbulence type='fractalNoise' baseFrequency='.92' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0'/></filter><rect width='100%' height='100%' filter='url(%23g)'/></svg>");
  --grain-opacity:.03;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-space);scroll-behavior:smooth}
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}
body::before{content:"";position:fixed;inset:0;z-index:50;pointer-events:none;background-image:var(--grain);opacity:var(--grain-opacity);mix-blend-mode:multiply}
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,svg{vertical-align:middle;max-width:100%}
img{height:auto}
svg{flex-shrink:0}
ul{list-style:none;margin:0;padding:0}
p{margin:0}
h1,h2,h3,h4{overflow-wrap:break-word;text-wrap:balance}
h1,h2,h3{font-family:var(--font-display);font-weight:400}
h1{font-size:var(--h1-size);line-height:1.1;letter-spacing:-.02em;margin:0 0 16px}
h2{font-size:var(--h2-size);line-height:1.25;margin:0 0 20px}
h3{font-size:var(--h3-size);line-height:1.35;margin:0 0 12px}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
[hidden]{display:none!important}
main,section,article,aside,nav,header,footer,figure,div{min-width:0}
code{font-family:var(--font-mono);overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--bg-panel-2);border-radius:var(--r-md);font-family:var(--font-mono);font-size:14px}
pre code{overflow-wrap:normal;white-space:pre}
.jf-sr{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.jf-skip{position:absolute;left:16px;top:-56px;z-index:60;padding:8px 16px;border-radius:var(--r-pill);background:var(--ink);color:var(--on-ink);font-size:14px}
.jf-skip:focus{top:12px}
.no-break{white-space:nowrap}
.jf-wrap,.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{width:100%;max-width:var(--reading);margin-inline:auto;padding-inline:var(--gutter)}
.jf-section{padding-top:var(--section-space);padding-bottom:var(--section-space)}
.jf-section__head{text-align:center;margin-bottom:40px}
.jf-section__head p{font-family:var(--font-mono);font-size:13px;color:var(--text-muted)}
.jf-muted{color:var(--text-muted)}
.jf-mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.jf-panel{background:var(--bg-panel);border:1px solid var(--border-soft);border-radius:var(--r-xl);box-shadow:var(--panel-shadow);padding:28px}
.prose{overflow-wrap:break-word}
.prose p,.prose ul,.prose ol,.prose blockquote,.prose pre{margin-bottom:24px}
.prose ul{list-style:disc;padding-left:24px}
.prose ol{padding-left:24px}
.prose li+li{margin-top:8px}
.prose h2{margin-top:48px}
.prose h3{margin-top:28px}
.prose a:not(:where(.jf-btn,.btn)){color:var(--accent-dark);text-decoration:underline;text-underline-offset:4px}
.prose code{background:var(--bg-panel-2);border-radius:var(--r-md);padding:2px 5px;font-size:.9em}
.prose pre code{padding:0;background:var(--clear)}
.jf-top{position:relative;isolation:isolate;overflow-x:clip;overflow-y:clip;max-width:100%;background:linear-gradient(180deg,var(--bg-panel) 0%,var(--bg) 30%,var(--apricot-veil) 72%,var(--apricot) 100%)}
.jf-top::before{content:"";position:absolute;inset:36% 0 0;z-index:-1;pointer-events:none;background:radial-gradient(48% 62% at 50% 72%,var(--rose-veil),var(--clear) 72%),radial-gradient(30% 42% at 6% 62%,var(--apricot-veil),var(--clear) 70%)}
.jf-top__glow{position:absolute;z-index:-1;right:-6%;bottom:-4%;width:42%;max-width:100%;aspect-ratio:1;border-radius:var(--r-circle);pointer-events:none;background:radial-gradient(closest-side,var(--accent-haze),var(--clear));animation:jf-breathe 18s ease-in-out infinite}
@keyframes jf-breathe{0%,100%{transform:scale(1);opacity:.7}50%{transform:scale(1.08);opacity:1}}
.jf-head{position:relative;z-index:20}
.jf-head__in{display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:24px;min-height:64px;position:relative}
.jf-brand{display:inline-flex;align-items:center;gap:10px;border-radius:var(--r-md);min-height:36px}
.jf-brand img{width:30px;height:30px;flex:none}
.jf-brand__word{font-family:var(--font-display);font-size:23px;line-height:1;letter-spacing:-.01em;color:var(--text)}
.jf-brand__zh{font-size:14px;font-weight:400;color:var(--text-muted)}
.jf-nav{justify-self:center}
.jf-nav__list{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:2px}
.jf-nav__link{display:inline-flex;align-items:center;gap:6px;height:36px;padding:0 12px;border-radius:var(--r-pill);border:1px solid var(--clear);font-size:14px;color:var(--text-muted);white-space:nowrap;transition:color var(--ease-time),background-color var(--ease-time),border-color var(--ease-time)}
.jf-nav__link svg{width:15px;height:15px;flex:none}
.jf-nav__link:hover{color:var(--text);background:var(--paper-glass)}
.jf-nav__link[aria-current="page"]{color:var(--text);background:var(--paper-glass);border-color:var(--border);box-shadow:inset 0 1px 0 var(--highlight)}
.jf-head__acts{display:flex;align-items:center;gap:8px}
.jf-language{position:relative}
.jf-lang{appearance:none;border:0;background:var(--clear);display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;height:36px;padding:0 10px;border-radius:var(--r-pill);font-size:14px;color:var(--text-muted);transition:color var(--ease-time),background-color var(--ease-time)}
.jf-lang span{white-space:nowrap}
.jf-lang svg{width:15px;height:15px;flex:none}
.jf-lang:hover{color:var(--text);background:var(--paper-glass)}
.jf-lang__caret{font-size:11px}
.jf-lang-menu{position:absolute;right:0;top:calc(100% + 8px);min-width:180px;padding:8px;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--r-lg);box-shadow:var(--panel-shadow);z-index:25}
.jf-lang-menu a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-md);font-size:14px}
.jf-lang-menu a:hover,.jf-lang-menu a[aria-current]{background:var(--bg-panel-2)}
.jf-acts__rule{width:1px;height:18px;background:var(--border);flex:none}
.jf-login{display:inline-flex;align-items:center;justify-content:center;height:38px;padding:0 20px;margin-left:4px;border-radius:var(--r-pill);border:1px solid var(--text);background:var(--paper-glass);font-size:14px;font-weight:600;color:var(--text);white-space:nowrap;transition:background-color var(--ease-time),color var(--ease-time)}
.jf-login:hover{background:var(--ink);color:var(--on-ink)}
.jf-menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;background:var(--clear);border-radius:var(--r-pill)}
.jf-menu-toggle svg{width:22px;height:22px}
.jf-drawer{display:none}
html.nav-open{overflow:hidden}
.jf-hero{position:relative;padding-top:24px;padding-bottom:88px}
.jf-hero__copy{position:relative;z-index:2;display:flex;flex-direction:column;align-items:center;text-align:center}
.jf-badge{display:inline-flex;align-items:center;gap:9px;min-height:30px;padding:3px 14px;margin-bottom:18px;border-radius:var(--r-pill);border:1px solid var(--border);background:var(--paper-glass);box-shadow:inset 0 1px 0 var(--highlight);font-size:13px;color:var(--text-muted);max-width:100%}
.jf-badge__dot{width:7px;height:7px;border-radius:var(--r-circle);background:var(--accent);box-shadow:0 0 0 3px var(--accent-ring);flex:none}
.jf-h1{margin:0 0 14px;font-family:var(--font-display);font-weight:400;font-size:var(--h1-size);line-height:1.06;letter-spacing:-.025em;color:var(--text)}
.jf-h1 em{font-style:italic;color:var(--accent);letter-spacing:-.01em;padding-right:.04em}
.jf-lede{max-width:760px;margin-bottom:24px;font-size:19px;line-height:1.55;color:var(--text-muted)}
.jf-lede strong{color:var(--text);font-weight:600}
.jf-ctas{display:flex;flex-wrap:wrap;justify-content:center;gap:12px;margin-bottom:18px}
.jf-btn,.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:52px;padding:12px 28px;border:1px solid var(--clear);border-radius:var(--r-pill);font-size:16px;font-weight:600;line-height:1.5;flex-shrink:0;white-space:nowrap;transition:transform var(--ease-time),background-color var(--ease-time),border-color var(--ease-time)}
.jf-btn svg{width:18px;height:18px;flex:none}
.jf-btn--ink,.btn-primary{background:var(--ink);color:var(--on-ink);box-shadow:0 14px 30px -12px var(--shadow-ink),inset 0 1px 0 var(--ink-sheen)}
.jf-btn--ink svg{color:var(--accent-soft)}
.jf-btn--ink:hover,.btn-primary:hover{background:var(--ink-hover);transform:translateY(-1px)}
.jf-btn--paper,.btn-secondary{border-color:var(--border);background:var(--paper-glass);color:var(--text);box-shadow:inset 0 1px 0 var(--highlight)}
.jf-btn--paper:hover,.btn-secondary:hover{border-color:var(--text-muted);transform:translateY(-1px)}
.jf-btn:active,.btn:active{transform:translateY(1px)}
.jf-btn:disabled,.jf-btn[aria-disabled="true"]{background:var(--bg-panel-2);color:var(--text-muted);border-color:var(--border);box-shadow:none;transform:none}
.jf-trust{display:flex;flex-wrap:wrap;justify-content:center;gap:4px 0;margin-bottom:16px;font-family:var(--font-mono);font-size:13px;line-height:20px;color:var(--text-muted)}
.jf-trust li{display:inline-flex;align-items:center}
.jf-trust li+li::before{content:"";width:4px;height:4px;margin:0 14px;border-radius:var(--r-circle);background:var(--border-strong);flex:none}
.jf-row{display:flex;align-items:center;justify-content:center;gap:16px;flex-wrap:wrap}
.jf-row--os{margin-bottom:10px}
.jf-row--flags{margin-bottom:38px}
.jf-row__label{min-width:64px;padding-right:16px;border-right:1px solid var(--border);font-family:var(--font-mono);font-size:11.5px;line-height:14px;letter-spacing:.08em;color:var(--text-muted);text-align:right}
.jf-row__list{display:flex;flex-wrap:wrap;justify-content:center;gap:6px 22px}
.jf-row__item{display:inline-flex;align-items:center;gap:7px;font-size:13.5px;line-height:24px;color:var(--text-muted)}
.jf-os-ico{width:17px;height:17px;flex:none;color:var(--text-muted);opacity:.78}
.jf-flag{width:22px;height:16px;flex:none;overflow:hidden;border-radius:var(--r-none)}
.f-r{fill:var(--flag-red)}
.f-b{fill:var(--flag-blue)}
.f-w{fill:var(--flag-white)}
.f-edge{fill:none;stroke:var(--border);stroke-width:1}
.jf-footer{border-top:1px solid var(--border);background:linear-gradient(180deg,var(--bg),var(--bg-panel-2));padding-top:64px;padding-bottom:28px}
.jf-footer__grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:48px}
.jf-footer__brand p{max-width:320px;margin-top:18px;color:var(--text-muted);font-size:14px}
.jf-footer__title{font-family:var(--font-body);font-weight:600;font-size:14px;margin:0 0 16px}
.jf-footer__links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 16px}
.jf-footer__links a,.jf-footer__languages a,.jf-footer__legal a{display:inline-flex;align-items:center;min-height:32px;font-size:13px;color:var(--text-muted)}
.jf-footer a:hover{color:var(--accent-dark)}
.jf-footer__languages{display:flex;flex-wrap:wrap;gap:8px 24px;margin-top:40px;padding-top:20px;border-top:1px solid var(--border)}
.jf-footer__bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;margin-top:20px;font-family:var(--font-mono);font-size:12px;color:var(--text-muted)}
.jf-footer__legal{display:flex;flex-wrap:wrap;gap:20px}
.reveal{transition:opacity .65s ease,transform .65s ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:static;display:block;min-height:80px;max-width:100%;overflow:hidden;margin-top:24px;margin-bottom:24px}
#server-status+*{margin-top:24px}
@media(max-width:1100px){
  .jf-head__in{gap:16px}
  .jf-nav__link{padding:0 9px}
}
@media(min-width:769px) and (max-width:920px){
  .jf-head__in{grid-template-columns:auto 1fr;grid-template-areas:"brand acts" "nav nav";row-gap:6px;padding-block:10px}
  .jf-brand{grid-area:brand}
  .jf-head__acts{grid-area:acts;justify-self:end}
  .jf-nav{grid-area:nav;justify-self:stretch;overflow-x:auto;scrollbar-width:none;margin-inline:-8px}
  .jf-nav__list{width:max-content;padding-inline:8px}
}
@media(max-width:768px){
  :root{--h1-size:40px;--h2-size:32px;--section-space:56px}
  .jf-h1{font-size:40px}
  .jf-head__in{display:flex;gap:12px;min-height:64px}
  .jf-head__in>.jf-nav{display:none}
  .jf-head__acts{margin-left:auto;gap:4px}
  .jf-menu-toggle{display:inline-flex}
  .jf-drawer:not([hidden]){display:block;position:absolute;top:100%;left:var(--gutter);right:var(--gutter);z-index:30;padding:12px;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--r-xl);box-shadow:var(--panel-shadow);max-height:calc(100dvh - 80px);overflow-y:auto;overscroll-behavior:contain}
  .jf-drawer a{display:flex;align-items:center;gap:10px;width:100%;min-height:44px;padding:10px 14px;border-radius:var(--r-md);font-size:14px}
  .jf-drawer a svg{width:16px;height:16px}
  .jf-drawer a:hover,.jf-drawer a[aria-current]{background:var(--bg-panel-2)}
  .jf-drawer__languages{margin-top:12px;padding-top:12px;border-top:1px solid var(--border)}
  .jf-footer__grid{grid-template-columns:1fr 1fr;gap:32px}
  .jf-footer__brand{grid-column:1/-1}
}
@media(max-width:640px){
  :root{--gutter:20px}
  .no-break{white-space:normal}
  .jf-hero{padding-top:16px;padding-bottom:56px}
  .jf-h1{line-height:1.12}
  .jf-lede{font-size:16.5px}
  .jf-btn,.btn{min-height:48px;padding:11px 22px;font-size:15px}
  .jf-trust{font-size:12px}
  .jf-trust li+li::before{margin:0 10px}
  .jf-row{flex-direction:column;gap:6px}
  .jf-row__label{min-width:0;padding-right:0;border-right:0;text-align:center}
  .jf-panel{padding:20px}
  .tilt,[data-tilt]{transform:none}
  .jf-top__glow{max-width:100%}
}
@media(max-width:480px){
  .jf-lang__text,.jf-acts__rule{display:none}
  .jf-login{padding:0 14px;margin-left:0}
  .jf-brand{gap:7px}
  .jf-head__in{gap:6px}
  .jf-footer__grid{grid-template-columns:1fr}
  .jf-footer__brand{grid-column:auto}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .jf-top__glow{animation:none}
  .reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none;transition:none}
  .jf-btn,.btn,.jf-login,.jf-nav__link,.jf-lang{transition:none}
}