:root{
  color-scheme:light;
  --bg:#FBF2E4;
  --bg-top:#FFF8EC;
  --bg-bottom:#F6E8D2;
  --panel:#FFFBF4;
  --panel-2:#F4E5CF;
  --border:#E6D2B4;
  --border-warm:#D6BB95;
  --accent:#E0457B;
  --accent-dark:#B02A5D;
  --text:#2B1D14;
  --text-soft:#4A3527;
  --muted:#6E5A4A;
  --success:#2A9D63;
  --warn:#D98A1C;
  --error:#C8372D;
  --mint:#2BB37A;
  --apricot:#FF9A3C;
  --cobalt:#3D6BE0;
  --white:#FFFFFF;
  --accent-soft:#FBE3EC;
  --accent-mist:#F5C6D6;
  --accent-clay:#EBA5BF;
  --apricot-soft:#FFE6CC;
  --apricot-clay:#FFCB97;
  --mint-soft:#D0EEE6;
  --cobalt-soft:#DCE4FA;
  --success-soft:#D4EEDF;
  --clay-hi:#FFFDF8;
  --clay-mid:#F8EBD8;
  --clay-lo:#EAD4B5;
  --clay-deep:#CBB08C;
  --keyhole:#8C6A4F;
  --wood-light:#EBC9A4;
  --wood-hi:#D7A97C;
  --wood-lo:#A8744A;
  --foil:#DDA95C;
  --stamp-ink:#C46C8C;
  --flag-red:#D7343F;
  --flag-blue:#2E4C93;
  --flag-white:#FFFFFF;
  --flag-edge:rgba(43,29,20,.16);
  --glow-apricot-6:rgba(255,154,60,.06);
  --glow-berry-6:rgba(224,69,123,.06);
  --glow-apricot-18:rgba(255,154,60,.18);
  --glow-berry-14:rgba(224,69,123,.14);
  --shade-berry-10:rgba(224,69,123,.10);
  --shade-berry-14:rgba(224,69,123,.14);
  --shade-berry-30:rgba(224,69,123,.30);
  --shade-brown-06:rgba(43,29,20,.06);
  --shade-brown-10:rgba(43,29,20,.10);
  --shade-brown-16:rgba(43,29,20,.16);
  --shade-brown-24:rgba(43,29,20,.24);
  --hi-white:rgba(255,255,255,.92);
  --hi-white-soft:rgba(255,255,255,.5);
  --hi-white-faint:rgba(255,255,255,.2);
  --glass-streak:rgba(255,255,255,.55);
  --clear:transparent;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","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;
  --fs-tiny:11px;
  --fs-xs:12px;
  --fs-sm:13px;
  --fs-ui:14px;
  --fs-nav:15px;
  --fs-body:16px;
  --fs-lede:17px;
  --fs-subtitle:20px;
  --fs-brand:21px;
  --fs-h3:24px;
  --fs-h2:clamp(28px,3.3vw,44px);
  --fs-h1:clamp(52px,4.85vw,68px);
  --fs-hero:66px;
  --fs-h1-mobile:clamp(28px,8.5vw,40px);
  --weight-normal:400;
  --weight-medium:500;
  --weight-semibold:600;
  --weight-bold:700;
  --weight-heavy:800;
  --weight-display:900;
  --tracking-zh:-.02em;
  --tracking-latin:-.03em;
  --tracking-meta:.06em;
  --r-pill:999px;
  --r-round:50%;
  --r-card:48px;
  --r-panel:20px;
  --r-groove:16px;
  --r-sm:12px;
  --r-flag:4px;
  --r-marker:.16em .32em .2em .36em;
  --container:1360px;
  --content-max:1280px;
  --reading:800px;
  --gutter:40px;
  --head-height:76px;
  --toc-offset:16px;
  --anchor-offset:100px;
  --section-space:80px;
  --shadow-panel:0 24px 48px -16px var(--shade-berry-10),inset 0 1px 0 var(--hi-white);
  --shadow-deep:0 24px 48px -16px var(--shade-berry-14),0 4px 12px var(--shade-brown-06),inset 0 1px 0 var(--hi-white);
  --ease:ease;
  --duration-fast:.18s;
  --duration-reveal:.55s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:var(--fs-body);line-height:1.6;-webkit-font-smoothing:antialiased}
html.nav-open{overflow:hidden}
[hidden]{display:none!important}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
button,input,select,textarea{font:inherit;color:inherit}
button,summary,a{-webkit-tap-highlight-color:var(--clear)}
button{cursor:pointer}
a{color:inherit;text-underline-offset:.2em}
a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,[tabindex]:focus-visible{outline:2px solid var(--text);outline-offset:3px}
button:disabled,.btn[aria-disabled="true"]{opacity:.5;cursor:not-allowed;transform:none;pointer-events:none}
h1,h2,h3{font-family:var(--font-display);color:var(--text);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--fs-h1);font-weight:var(--weight-display);line-height:1.1;letter-spacing:var(--tracking-zh);margin:0 0 32px}
h2{font-size:var(--fs-h2);font-weight:var(--weight-display);line-height:1.2;letter-spacing:var(--tracking-zh);margin:0 0 24px}
h3{font-size:var(--fs-h3);font-weight:var(--weight-heavy);line-height:1.3;letter-spacing:var(--tracking-zh);margin:0 0 16px}
p{margin:0 0 24px}
ul,ol{padding-inline-start:1.4em}
li{margin-block:6px}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere;background:var(--panel-2);border-radius:var(--r-flag);padding:.12em .3em}
pre{max-width:100%;overflow-x:auto;background:var(--panel-2);border:1px solid var(--border);padding:24px;border-radius:var(--r-groove)}
pre code{padding:0;overflow-wrap:normal;white-space:pre}
hr{border:0;border-top:1px solid var(--border);margin-block:32px}
table{border-collapse:collapse}
th,td{text-align:start}
.wrap{width:100%;max-width:var(--container);margin-inline:auto;padding-inline:var(--gutter);min-width:0}
.reading-wrap{width:100%;max-width:calc(var(--reading) + var(--gutter)*2);margin-inline:auto;padding-inline:var(--gutter);min-width:0}
.section{padding-top:var(--section-space);padding-bottom:var(--section-space)}
.stack{display:grid;gap:24px}
.stack>*{min-width:0}
.panel{padding:32px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-panel);box-shadow:var(--shadow-panel);min-width:0}
.groove{padding:24px;background:var(--panel-2);border-radius:var(--r-groove);box-shadow:inset 0 1px 3px var(--shade-brown-06),0 1px 0 var(--hi-white-soft)}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono)}
.lat{letter-spacing:var(--tracking-latin)}
.no-break{white-space:nowrap}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.reveal{transition:opacity var(--duration-reveal) var(--ease),transform var(--duration-reveal) var(--ease)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
.counter-stat,[data-counter]{display:inline-block;min-width:3ch;font-variant-numeric:tabular-nums;font-family:var(--font-mono)}
#server-status{position:relative;display:block;min-height:160px;min-width:0;max-width:100%;overflow:hidden;margin-block:24px}
#server-status+*{margin-top:24px}
#server-status>*{min-width:0;max-width:100%}
.btn{display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;gap:10px;min-height:56px;padding:16px 28px;border:1px solid var(--clear);border-radius:var(--r-pill);font:var(--weight-bold) var(--fs-body)/1.35 var(--font-body);text-align:center;text-decoration:none;white-space:nowrap;transition:transform var(--duration-fast) var(--ease),box-shadow var(--duration-fast) var(--ease)}
.btn:hover{transform:translateY(-2px)}
.btn svg{width:18px;height:18px;display:block}
.btn-primary{background:linear-gradient(160deg,var(--accent) 45%,var(--accent-dark) 150%);color:var(--panel);box-shadow:0 16px 32px -12px var(--shade-berry-30),inset 0 1px 0 var(--hi-white-soft)}
.btn-primary:active{background:var(--accent-dark);transform:translateY(0)}
.btn-ghost,.btn-secondary{background:var(--panel);color:var(--text);border-color:var(--border-warm);box-shadow:0 10px 24px -16px var(--shade-brown-16),inset 0 1px 0 var(--hi-white)}
.btn-ghost:active,.btn-secondary:active{background:var(--panel-2);transform:translateY(0)}
.btn-small{min-height:44px;padding:12px 20px;font-size:var(--fs-ui)}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin:0 0 32px}
.badge{display:inline-flex;align-items:center;gap:10px;max-width:100%;margin:0 0 24px;padding:7px 16px 7px 10px;border-radius:var(--r-pill);background:var(--panel);border:1px solid var(--border);font:var(--weight-semibold) var(--fs-sm)/1.4 var(--font-body);color:var(--muted);box-shadow:0 8px 20px -12px var(--shade-berry-14),inset 0 1px 0 var(--hi-white);overflow-wrap:anywhere}
.badge-dot{width:8px;height:8px;flex-shrink:0;border-radius:var(--r-round);background:var(--success);box-shadow:0 0 0 4px var(--success-soft)}
.site-head,#site-header{position:relative;z-index:20}
.head-inner{max-width:var(--container);width:100%;padding-inline:var(--gutter);margin:0 auto;height:var(--head-height);display:flex;align-items:center;gap:24px}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:var(--text);flex:none;min-height:44px}
.brand-mark{width:36px;height:36px;display:block;filter:drop-shadow(0 6px 12px var(--shade-berry-14))}
.brand-name{font:var(--weight-display) var(--fs-brand)/1 var(--font-display);letter-spacing:var(--tracking-latin)}
.brand-zh{font-weight:var(--weight-medium);color:var(--muted)}
.nav{margin-left:40px}
.nav-list{display:flex;align-items:center;gap:4px;list-style:none;margin:0;padding:0}
.nav-list li{margin:0}
.nav-link{position:relative;display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:44px;padding:10px 14px;border-radius:var(--r-pill);font:var(--weight-semibold) var(--fs-nav)/1 var(--font-body);color:var(--text);text-decoration:none;background:none;border:0;cursor:pointer;white-space:nowrap}
.nav-link:hover{background:var(--panel-2)}
.nav-link[aria-current="page"]::after{content:"";position:absolute;left:50%;bottom:2px;width:4px;height:4px;margin-left:-2px;border-radius:var(--r-round);background:var(--text)}
.nav-caret{font-size:var(--fs-tiny);color:var(--muted)}
.nav-more{position:relative}
.more-panel{position:absolute;top:calc(100% + 8px);left:50%;width:264px;padding:8px;list-style:none;margin:0;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-panel);box-shadow:var(--shadow-deep);z-index:22}
.more-link{display:block;min-height:44px;padding:10px 12px;border-radius:var(--r-sm);text-decoration:none}
.more-link:hover,.more-link:focus-visible,.more-link[aria-current="page"]{background:var(--panel-2)}
.more-title{display:block;font:var(--weight-bold) var(--fs-ui)/1.3 var(--font-body)}
.more-desc{display:block;font:var(--weight-medium) var(--fs-xs)/1.4 var(--font-body);color:var(--muted);margin-top:2px}
.head-actions{margin-left:auto;display:flex;align-items:center;gap:10px;flex:none}
.language-box{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;width:auto;min-width:44px;min-height:44px;padding:9px 12px;border:0;border-radius:var(--r-pill);background:none;font:var(--weight-semibold) var(--fs-ui)/1 var(--font-body);color:var(--muted);cursor:pointer;white-space:nowrap}
.lang:hover{background:var(--panel-2)}
.lang svg{width:16px;height:16px;display:block}
.language-panel{position:absolute;right:0;top:calc(100% + 8px);width:200px;padding:8px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-panel);box-shadow:var(--shadow-deep);z-index:23}
.language-panel a{display:flex;align-items:center;min-height:44px;padding:10px 12px;text-decoration:none;border-radius:var(--r-sm)}
.language-panel a:hover,.language-panel [aria-current="true"]{background:var(--panel-2)}
.login-pill{display:inline-flex;align-items:center;justify-content:center;padding:12px 24px;min-height:44px;border-radius:var(--r-pill);background:linear-gradient(180deg,var(--text-soft),var(--text));color:var(--panel);font:var(--weight-bold) var(--fs-nav)/1 var(--font-body);text-decoration:none;white-space:nowrap;box-shadow:0 12px 24px -12px var(--shade-brown-24),inset 0 1px 0 var(--hi-white-faint)}
.login-pill:hover{transform:translateY(-1px)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;border:1px solid var(--border);border-radius:var(--r-pill);background:var(--panel);font-size:var(--fs-subtitle)}
.mobile-drawer{display:none}
.menu-veil{position:fixed;inset:var(--head-height) 0 0;background:var(--shade-brown-24);z-index:18;border:0}
.preview-more>summary{list-style:none}
.preview-more>summary::-webkit-details-marker{display:none}
.preview-more .more-panel{transform:translateX(-50%)}
.paper-top{position:relative;overflow-x:clip;max-width:100%;background:linear-gradient(180deg,var(--bg-top) 0%,var(--bg) 55%,var(--bg-bottom) 100%)}
.halo{position:absolute;pointer-events:none;border-radius:var(--r-round)}
.halo-apricot{inset:-14% 46% 24% -16%;background:radial-gradient(closest-side,var(--glow-apricot-6),var(--clear))}
.halo-berry{inset:6% -12% -8% 38%;background:radial-gradient(closest-side,var(--glow-berry-6),var(--clear))}
.regmarks{position:absolute;inset:0;width:100%;height:100%;opacity:.1;pointer-events:none}
.rg-fill{fill:var(--text)}
.rg-ring{fill:none;stroke:var(--text)}
.hero{position:relative;z-index:1;padding-top:48px;padding-bottom:88px}
.hero-inner{max-width:var(--container);width:100%;padding-inline:var(--gutter);margin:0 auto;display:grid;grid-template-columns:42fr 56fr;column-gap:2%;align-items:center}
.hero-inner>*{min-width:0}
.hero-copy{position:relative;z-index:3}
.hero-title{margin:0 0 32px;font:var(--weight-display) var(--fs-hero)/1.1 var(--font-display);letter-spacing:var(--tracking-zh);isolation:isolate}
.mark{position:relative;display:inline-block;margin-left:.12em;padding:0 .1em;color:var(--panel)}
.mark::before{content:"";position:absolute;z-index:-1;inset:.14em -.06em .02em -.08em;border-radius:var(--r-marker);background:linear-gradient(100deg,var(--accent) 0%,var(--accent) 68%,var(--accent-dark) 140%);transform:rotate(-2deg) skewX(-6deg)}
.hero-lede{margin:0 0 24px;max-width:31em;font:var(--weight-normal) var(--fs-lede)/1.75 var(--font-body);color:var(--muted)}
.hero-lede strong{color:var(--text);font-weight:var(--weight-bold)}
.trust{list-style:none;margin:0 0 24px;padding:12px 16px;display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px 16px;border-radius:var(--r-groove);background:var(--panel-2);box-shadow:inset 0 1px 3px var(--shade-brown-06),0 1px 0 var(--hi-white-soft)}
.trust li{display:inline-flex;align-items:center;gap:6px;margin:0;font:var(--weight-semibold) var(--fs-ui)/1.3 var(--font-body);white-space:nowrap}
.trust svg{width:14px;height:14px;display:block;flex:none;color:var(--success)}
.meta{display:grid;gap:14px}
.meta-row{display:grid;grid-template-columns:72px 1fr;align-items:center}
.meta-row>*{min-width:0}
.meta-label{font:var(--weight-semibold) var(--fs-xs)/1 var(--font-mono);letter-spacing:var(--tracking-meta);color:var(--muted)}
.meta-list{display:flex;flex-wrap:wrap;gap:10px 16px;list-style:none;margin:0;padding:0}
.meta-list li{display:inline-flex;align-items:center;gap:6px;margin:0;font:var(--weight-semibold) var(--fs-sm)/1 var(--font-body);white-space:nowrap}
.plat-ico{width:17px;height:17px;display:block;flex:none;color:var(--muted);fill:currentColor}
.flag{position:relative;display:block;flex:none;width:24px;height:16px;border-radius:var(--r-flag);overflow:hidden;box-shadow:0 1px 3px var(--shade-brown-10)}
.flag::after{content:"";position:absolute;inset:0;border-radius:inherit;box-shadow:inset 0 0 0 1px var(--flag-edge)}
.flag svg{display:block;width:24px;height:16px}
.fx-red{fill:var(--flag-red)}
.fx-white{fill:var(--flag-white)}
.fx-blue{fill:var(--flag-blue)}
.site-footer{background:var(--panel-2);border-top:1px solid var(--border);padding-top:56px;padding-bottom:24px}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:40px}
.footer-grid>*{min-width:0}
.footer-brand p{max-width:27em;margin-top:16px;color:var(--muted)}
.footer-title{font-size:var(--fs-ui);font-weight:var(--weight-bold);margin:0 0 16px}
.footer-links{display:grid;gap:4px;list-style:none;margin:0;padding:0}
.footer-links li{margin:0;min-width:0}
.footer-links a{display:inline-flex;align-items:center;min-height:32px;padding-block:4px;font-size:var(--fs-ui);text-decoration:none;overflow-wrap:anywhere}
.footer-links a:hover{text-decoration:underline}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px;margin-top:40px;padding-top:20px;border-top:1px solid var(--border);font-size:var(--fs-sm);color:var(--muted)}
.footer-bottom p{margin:0}
.legal-links{display:flex;flex-wrap:wrap;gap:20px}
.legal-links a{display:inline-flex;align-items:center;min-height:32px}
.prose{min-width:0;overflow-wrap:break-word}
.prose h2{margin-top:56px}
.prose h3{margin-top:32px}
.prose p,.prose li{line-height:1.85}
@media(min-width:1500px){:root{--fs-hero:68px}}
@media(max-width:1150px){.nav{margin-left:8px}.head-inner{gap:16px}.nav-link{padding-inline:10px}.head-actions{gap:4px}.hero-title{font-size:var(--fs-h1)}}
@media(max-width:1000px){
  :root{--gutter:24px}
  .nav{display:none}
  .menu-toggle{display:inline-flex}
  .head-actions{margin-left:auto}
  .mobile-drawer{position:absolute;z-index:21;top:var(--head-height);left:0;right:0;background:var(--panel);padding:16px var(--gutter) 24px;border-bottom:1px solid var(--border);max-height:calc(100dvh - var(--head-height));overflow-y:auto;overscroll-behavior:contain;box-shadow:var(--shadow-deep)}
  .mobile-drawer:not([hidden]){display:block}
  .mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;border-radius:var(--r-sm);text-decoration:none}
  .mobile-drawer a:hover,.mobile-drawer a[aria-current]{background:var(--panel-2)}
  .drawer-languages{border-top:1px solid var(--border);margin-top:16px;padding-top:16px}
  .hero-title{font-size:var(--fs-h1)}
  .trust{justify-content:flex-start}
  .footer-grid{grid-template-columns:1.3fr 1fr;gap:32px}
}
@media(max-width:768px){
  :root{--section-space:56px}
  h1,.hero-title{font-size:var(--fs-h1-mobile)}
  .hero{padding-top:32px;padding-bottom:40px}
  .hero-inner{grid-template-columns:1fr;gap:24px}
  .hero-copy{max-width:620px}
  .hero-title{margin-bottom:24px}
  .hero .badge{margin-bottom:20px}
  .hero .cta-row{margin-bottom:24px}
  .regmarks{display:none}
  .halo{max-width:100%}
  .hero-lede{max-width:100%}
}
@media(max-width:640px){
  :root{--gutter:20px}
  .no-break{white-space:normal}
  .tilt,[data-tilt]{transform:none}
  .head-inner{gap:8px}
  .head-actions{gap:4px;margin-left:auto}
  .brand{gap:7px}
  .brand-mark{width:30px;height:30px}
  .brand-name{font-size:var(--fs-lede)}
  .login-pill{padding:12px 16px}
  .lang{padding-inline:8px}
  .language-box .lang-label{display:none}
  .panel{padding:24px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:24px}
  .footer-brand{grid-column:1/-1}
  .meta-row{grid-template-columns:1fr;gap:12px}
  .meta-list{gap:12px}
  .trust{gap:12px}
  .hero-lede{font-size:var(--fs-body)}
  .cta-row .btn{padding-inline:22px}
  pre{padding:16px}
}
@media(max-width:360px){:root{--gutter:16px}.head-inner{gap:4px}.login-pill{padding-inline:12px}.brand-name{font-size:var(--fs-body)}.btn{padding-inline:20px}}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}