:root{
  --paper:#F7F1E4;
  --paper-top:#FBF7EE;
  --paper-bottom:#F1E8D6;
  --panel:#FFFBF2;
  --groove:#EFE6D3;
  --line:#E2D6BE;
  --jade:#2FA265;
  --jade-deep:#1C6E44;
  --sprout:#B9E36B;
  --ink:#2A2219;
  --ink-muted:#6E6254;
  --ok:#3B8A3E;
  --warn:#C8861A;
  --err:#C2412F;
  --light:#FFFFFF;
  --clear:transparent;
  --flag-red:#B9473A;
  --flag-blue:#3B4B74;
  --flag-white:#FFFBF2;
  --ink-soft:rgba(42,34,25,.8);
  --ink-a06:rgba(42,34,25,.06);
  --ink-a08:rgba(42,34,25,.08);
  --ink-a30:rgba(42,34,25,.3);
  --jade-a10:rgba(47,162,101,.10);
  --jade-a12:rgba(47,162,101,.12);
  --jade-a14:rgba(47,162,101,.14);
  --jade-a24:rgba(47,162,101,.24);
  --jade-a35:rgba(47,162,101,.35);
  --sprout-a07:rgba(185,227,107,.07);
  --sprout-a18:rgba(185,227,107,.18);
  --panel-a72:rgba(255,251,242,.72);
  --panel-a86:rgba(255,251,242,.86);
  --light-a50:rgba(255,255,255,.5);
  --light-a70:rgba(255,255,255,.7);
  --line-a70:rgba(226,214,190,.7);
  --r-pill:999px;
  --r-panel:20px;
  --r-card:14px;
  --r-tile:10px;
  --r-zero:0px;
  --r-round:50%;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Yu Gothic","Apple SD Gothic Neo","Malgun Gothic","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Yu Gothic","Apple SD Gothic Neo","Malgun Gothic","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --text-xs:12px;
  --text-sm:14px;
  --text-base:16px;
  --text-lede:17px;
  --text-h3:22px;
  --text-h2:32px;
  --text-display:66px;
  --weight-normal:400;
  --weight-medium:500;
  --weight-semibold:600;
  --weight-bold:700;
  --weight-heavy:800;
  --gutter:24px;
  --content-width:1208px;
  --reading-width:800px;
  --anchor-offset:96px;
  --toc-offset:16px;
  --toc-anchor:96px;
  --header-edge:76px;
  --space-section:88px;
  --shadow-panel:0 24px 60px -24px var(--jade-a12),0 2px 8px -4px var(--ink-a08);
  --shadow-card:0 18px 42px -16px var(--jade-a24),0 2px 6px -2px var(--ink-a08),inset 0 1px 0 var(--light);
  --gradient-cta:linear-gradient(105deg,var(--jade) 0%,var(--jade) 38%,var(--sprout) 138%);
  --ease:ease;
  --quick:.2s;
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:var(--anchor-offset)}
body{font-family:var(--font-body);font-size:var(--text-base);font-weight:var(--weight-normal);color:var(--ink);background:var(--paper);line-height:1.6;-webkit-font-smoothing:antialiased}
img,video{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button,a{-webkit-tap-highlight-color:var(--jade-a12)}
button{border:0;background:var(--clear)}
[hidden]{display:none!important}
ul,ol{padding-left:1.5em}
h1,h2,h3{font-family:var(--font-display);font-weight:var(--weight-heavy);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:clamp(52px,5vw,var(--text-display));line-height:1.1;letter-spacing:-.02em}
h2{font-size:var(--text-h2);line-height:1.25;letter-spacing:-.02em}
h3{font-size:var(--text-h3);line-height:1.35}
p{overflow-wrap:break-word}
:where(a,button,input,textarea,select,summary,[tabindex]):focus-visible{outline:2px solid var(--jade-deep);outline-offset:3px}
a:focus-visible,button:focus-visible{border-radius:var(--r-pill)}
.no-break{white-space:nowrap}
.wrap,.shell{width:100%;max-width:var(--content-width);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{width:100%;max-width:var(--reading-width);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:var(--space-section);padding-bottom:var(--space-section)}
.section-head{margin-bottom:32px;max-width:760px}
.section-head p{margin-top:16px;color:var(--ink-muted)}
.grid{display:grid;gap:24px}
.grid>*{min-width:0}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-five{grid-template-columns:repeat(5,minmax(0,1fr))}
.stack>*+*{margin-top:24px}
.muted{color:var(--ink-muted)}
.accent{color:var(--jade-deep)}
.mono{font-family:var(--font-mono)}
.kicker{font-family:var(--font-mono);font-size:var(--text-xs);letter-spacing:.12em;color:var(--jade-deep)}
.panel,.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--r-panel);box-shadow:var(--shadow-panel),inset 0 1px 0 var(--light);padding:32px;min-width:0}
.groove{background:var(--groove)}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere}
:not(pre)>code{background:var(--groove);padding:2px 5px;border-radius:var(--r-tile)}
pre{max-width:100%;overflow-x:auto;padding:24px;background:var(--groove);border:1px solid var(--line);border-radius:var(--r-panel);font-family:var(--font-mono)}
pre code{white-space:pre;overflow-wrap:normal}
.prose{min-width:0}
.prose p,.prose ul,.prose ol,.prose pre,.prose blockquote,.prose .table-scroll{margin-block:24px}
.prose h2{margin-top:56px;margin-bottom:24px}
.prose h3{margin-top:32px;margin-bottom:16px}
.prose li+li{margin-top:10px}
.prose a{color:var(--jade-deep);text-decoration:underline;text-underline-offset:3px}
.prose section[id]{scroll-margin-top:var(--anchor-offset)}
.btn{min-height:50px;padding:12px 28px;border-radius:var(--r-pill);display:inline-flex;align-items:center;justify-content:center;gap:10px;font-size:var(--text-base);font-weight:var(--weight-bold);letter-spacing:.01em;line-height:1.4;flex-shrink:0;white-space:nowrap;max-width:100%;transition:transform var(--quick) var(--ease),box-shadow var(--quick) var(--ease),background-color var(--quick) var(--ease)}
.btn svg{width:16px;height:16px}
.btn-main,.btn-primary{background:var(--gradient-cta);color:var(--ink);box-shadow:0 14px 30px -12px var(--jade-a35),inset 0 1px 0 var(--light-a50)}
.btn-main:hover,.btn-primary:hover{transform:translateY(-1px);box-shadow:0 18px 34px -12px var(--jade-a35),inset 0 1px 0 var(--light-a50)}
.btn-ghost,.btn-secondary{border:1.5px solid var(--ink);color:var(--ink);background:var(--clear)}
.btn-ghost:hover,.btn-secondary:hover{background:var(--ink-a06)}
.btn:active{transform:translateY(1px)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.5;cursor:not-allowed;transform:none}
.btn-small{min-height:40px;padding:9px 18px;font-size:var(--text-sm)}
.ctas{margin-top:24px;display:flex;justify-content:center;flex-wrap:wrap;gap:14px}
.badge{display:inline-flex;align-items:center;gap:9px;min-height:28px;padding:3px 14px 3px 10px;border-radius:var(--r-pill);background:var(--groove);border:1px solid var(--line);font-size:13px;color:var(--ink-soft);max-width:100%;overflow-wrap:anywhere}
.badge-dot{width:8px;height:8px;flex-shrink:0;border-radius:var(--r-round);background:linear-gradient(160deg,var(--sprout),var(--jade));box-shadow:0 0 0 3px var(--jade-a14)}
.badge-mono{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;color:var(--ink-muted)}
.tag{display:inline-block;padding:4px 12px;max-width:100%;border:1px solid var(--line);border-radius:var(--r-pill);background:var(--groove);color:var(--ink-muted);font-size:var(--text-xs);overflow-wrap:anywhere}
.facts{margin-top:16px;display:flex;justify-content:center;flex-wrap:wrap;gap:10px}
.fact{min-height:32px;display:inline-flex;align-items:center;gap:7px;padding:5px 14px 5px 11px;border-radius:var(--r-pill);background:var(--panel-a72);border:1px solid var(--line);font-size:13px;color:var(--ink-soft);box-shadow:inset 0 1px 0 var(--light-a70);max-width:100%}
.fact svg{width:15px;height:15px;flex-shrink:0;color:var(--jade-deep)}
.fact-m{display:none}
.grain{position:fixed;inset:0;width:100%;height:100%;pointer-events:none;z-index:60;opacity:.12;mix-blend-mode:multiply}
.grain-ink{flood-color:var(--ink)}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.notice{position:relative;z-index:6;min-height:38px;display:flex;align-items:center;justify-content:center;gap:10px;background:var(--jade);color:var(--ink);font-size:var(--text-sm);font-weight:var(--weight-medium);padding-inline:16px}
.notice-sep{opacity:.55}
.notice a{font-weight:var(--weight-semibold);text-decoration:underline;text-decoration-thickness:1.5px;text-underline-offset:3px;display:inline-flex;align-items:center;gap:6px;min-height:24px}
.notice-arrow{display:inline-block;transition:transform var(--quick) var(--ease)}
.notice a:hover .notice-arrow{transform:translateX(3px)}
.screen{position:relative;background:linear-gradient(180deg,var(--paper-top) 0%,var(--paper) 52%,var(--paper-bottom) 100%)}
#site-header{position:relative;z-index:40}
.masthead{position:relative;z-index:45;padding-top:12px}
.navbar{display:flex;align-items:center;flex-wrap:nowrap;height:52px;padding:0 8px 0 16px;border-radius:var(--r-pill);background:var(--panel-a72);border:1px solid var(--line-a70);box-shadow:var(--shadow-panel);backdrop-filter:blur(14px) saturate(1.15);-webkit-backdrop-filter:blur(14px) saturate(1.15)}
.brand{display:inline-flex;align-items:center;gap:10px;flex:none;min-height:30px}
.brand img{width:30px;height:30px;flex-shrink:0}
.brand-en{font-family:var(--font-display);font-weight:var(--weight-heavy);font-size:18px;letter-spacing:-.02em;color:var(--ink)}
.brand-zh{font-size:var(--text-sm);font-weight:var(--weight-medium);color:var(--ink-muted)}
.desktop-nav{flex:1;min-width:0}
.menu{display:flex;align-items:center;justify-content:center;list-style:none;margin:0;padding:0;gap:clamp(12px,2.1vw,30px)}
.menu li{flex-shrink:0}
.menu a{display:inline-flex;align-items:center;min-height:36px;font-size:15px;font-weight:var(--weight-medium);color:var(--ink-soft);transition:color var(--quick) var(--ease)}
.menu a:hover{color:var(--ink)}
.menu a[aria-current="page"]{font-weight:var(--weight-bold);color:var(--ink)}
.nav-end{display:flex;align-items:center;gap:12px;flex-shrink:0;margin-left:16px}
.login{min-height:36px;padding:7px 20px;border-radius:var(--r-pill);background:var(--ink);color:var(--panel);font-size:var(--text-sm);font-weight:var(--weight-semibold);display:inline-flex;align-items:center;justify-content:center;white-space:nowrap;transition:transform var(--quick) var(--ease)}
.login:hover{transform:translateY(-1px)}
.language{position:relative}
.lang-button,.lang{min-width:44px;min-height:36px;width:auto;display:inline-flex;align-items:center;justify-content:center;padding:6px;gap:5px;font-size:var(--text-sm);color:var(--ink-muted);white-space:nowrap}
.lang-button span{white-space:nowrap}
.lang-panel{position:absolute;z-index:55;top:calc(100% + 12px);right:0;width:192px;background:var(--panel);border:1px solid var(--line);border-radius:var(--r-panel);padding:8px;box-shadow:var(--shadow-card)}
.lang-panel a{display:flex;align-items:center;min-height:40px;padding:8px 12px;border-radius:var(--r-tile);font-size:var(--text-sm)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{color:var(--jade-deep);background:var(--groove)}
.menu-toggle{display:none;min-width:44px;min-height:44px;align-items:center;justify-content:center;flex-direction:column;gap:5px;color:var(--ink)}
.menu-line{display:block;width:20px;height:2px;background:currentColor;border-radius:var(--r-pill)}
.mobile-drawer{display:none}
.menu-veil{display:none}
html.nav-open{overflow:hidden}
.site-footer{border-top:1px solid var(--line);background:var(--groove);padding-top:56px;padding-bottom:24px}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:48px}
.footer-grid>*{min-width:0}
.footer-brand p{color:var(--ink-muted);max-width:34ch;margin-top:18px}
.footer-title{font-size:var(--text-sm);font-weight:var(--weight-bold);margin-bottom:16px}
.footer-links{list-style:none;padding:0;margin:0;display:flex;flex-wrap:wrap;gap:8px 20px}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:28px;font-size:var(--text-sm)}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{color:var(--jade-deep);text-decoration:underline;text-underline-offset:4px}
.footer-languages{display:flex;flex-wrap:wrap;gap:12px 24px;margin-top:40px;padding-top:24px;border-top:1px solid var(--line)}
.footer-languages a[aria-current="true"]{font-weight:var(--weight-bold);color:var(--jade-deep)}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px;margin-top:24px;font-size:var(--text-xs);color:var(--ink-muted)}
.footer-legal{display:flex;gap:20px}
.reveal{transition:opacity .35s var(--ease),transform .35s var(--ease)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{display:block;position:static;overflow:hidden;min-width:0;max-width:100%;margin-top:32px;margin-bottom:32px}
#server-status+*{margin-top:32px}
#server-status>*{min-width:0;max-width:100%}
[data-count]{font-family:var(--font-mono);font-variant-numeric:tabular-nums;display:inline-block;min-width:3ch;text-align:right}
.skip-link{position:absolute;z-index:70;left:var(--gutter);top:8px;transform:translateY(-200%);padding:10px 18px;background:var(--panel);color:var(--ink);border-radius:var(--r-pill)}
.skip-link:focus{transform:none}
@media(max-width:1100px){
  .menu{gap:16px}
  .menu a{font-size:var(--text-sm)}
  .brand-zh{display:none}
  .nav-end{gap:8px;margin-left:12px}
}
@media(max-width:1024px){
  .desktop-nav{display:none}
  .nav-end{margin-left:auto}
  .menu-toggle{display:flex}
  .mobile-drawer{display:block;position:fixed;z-index:43;top:var(--header-edge);left:0;right:0;height:calc(100dvh - var(--header-edge));max-height:calc(100dvh - var(--header-edge));overflow-y:auto;overscroll-behavior:contain;background:var(--panel);padding:16px var(--gutter) 32px;border-top:1px solid var(--line)}
  .mobile-drawer ul{list-style:none;margin:0;padding:0}
  .mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;border-bottom:1px solid var(--line);font-weight:var(--weight-medium)}
  .mobile-drawer a[aria-current]{color:var(--jade-deep);font-weight:var(--weight-bold)}
  .drawer-languages{margin-top:24px}
  .menu-veil{display:block;position:fixed;z-index:41;inset:var(--header-edge) 0 0;background:var(--ink-a30)}
}
@media(max-width:768px){
  :root{--gutter:20px;--space-section:56px;--text-h2:28px}
  h1{font-size:38px;line-height:1.12}
  .grid-three{grid-template-columns:1fr}
  .grid-five{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1fr;gap:32px}
  .panel,.card{padding:24px}
  .notice{padding-top:9px;padding-bottom:9px;font-size:12.5px;flex-wrap:wrap;text-align:center;gap:4px 8px}
  .fact-m{display:inline-flex}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .tilt,[data-tilt]{transform:none}
  .decorative,.device-aura,.device-shadow,.device-sprout{max-width:100%}
  .brand{gap:7px}
  .brand-en{font-size:16px}
  .brand img{width:27px;height:27px}
  .nav-end{gap:2px}
  .navbar{padding-left:10px;padding-right:4px}
  .login{padding-inline:12px;font-size:13px}
  .lang-button{font-size:var(--text-xs);padding-inline:4px}
  .lang{display:none}
  .btn{padding-inline:24px}
}
@media(max-width:359px){
  .brand-en{font-size:var(--text-sm)}
  .brand img{width:24px;height:24px}
  .lang-button{font-size:11px}
  .login{padding-inline:9px}
  .nav-end{gap:0}
  .grid-five{grid-template-columns:1fr}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none;transition:none}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
}