:root{
  color-scheme:light;
  --bg:#F5F5F3;--bg-top:#FAFAF8;--bg-bottom:#EEEEEA;--panel:#FFFFFF;--panel-2:#ECECE8;--tray-end:#E2E1DC;--side-dark:#D3D2CC;--border:#DEDDD8;
  --accent:#E5482F;--accent-2:#F2866B;--accent-dark:#B8331F;--text:#15161A;--muted:#5F6068;--mid:#8A8B92;--success:#1E9E61;--warn:#C98A0B;--error:#B3261E;
  --grid-line:rgba(21,22,26,.04);--tint-6:rgba(229,72,47,.06);--tint-10:rgba(229,72,47,.10);--tint-14:rgba(229,72,47,.14);--ink-06:rgba(21,22,26,.06);--ink-10:rgba(21,22,26,.10);--veil:rgba(21,22,26,.32);--hi:rgba(255,255,255,.95);--hi-soft:rgba(255,255,255,.55);--bar-bg:rgba(250,250,248,.88);--success-ring:rgba(30,158,97,.16);--clear:rgba(255,255,255,0);
  --f-display:"Inter","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --f-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --f-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --fs-tiny:10px;--fs-micro:10.5px;--fs-caption:11px;--fs-label:11.5px;--fs-small:12px;--fs-ui:12.5px;--fs-note:13px;--fs-tool:13.5px;--fs-nav:14px;--fs-body:15px;--fs-brand:17px;--fs-lede:19px;--fs-h3:22px;--fs-h2:32px;--fs-manifesto:38px;--fs-h1:64px;--fs-h1-mobile:36px;--fs-price:40px;
  --weight-normal:400;--weight-medium:500;--weight-semi:600;--weight-bold:700;--weight-display:800;
  --r-xs:6px;--r-sm:8px;--r-md:10px;--r-lg:28px;--r-mobile:20px;--r-mini:4px;--r-control:5px;--r-pill:999px;--r-circle:50%;
  --wrap:1200px;--gutter:24px;--header-h:60px;--anchor-offset:136px;
  --shadow-panel:inset 0 1px 0 var(--hi),0 2px 4px var(--ink-06),0 24px 64px var(--tint-10);
  --shadow-small:inset 0 1px 0 var(--hi),0 1px 2px var(--ink-06);
  --ease:150ms ease;--reveal-time:350ms;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:76px}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--f-body);font-size:var(--fs-body);line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
a{color:inherit;text-underline-offset:3px}
img,video{max-width:100%;height:auto}
svg{flex-shrink:0}
button,a,summary,[role="tab"]{-webkit-tap-highlight-color:var(--clear)}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px}
[hidden]{display:none!important}
:where(h1,h2,h3,p,ul,ol,dl,blockquote,pre){margin-top:0}
h1,h2,h3{font-family:var(--f-display);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:clamp(52px,5vw,68px);font-weight:var(--weight-display);line-height:1.12;letter-spacing:-.02em}
h2{font-size:var(--fs-h2);line-height:1.25;letter-spacing:-.02em}
h3{font-size:var(--fs-h3);line-height:1.35}
p{margin-bottom:1.25em}
code,kbd,pre{font-family:var(--f-mono)}
code{overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--panel-2);border:1px solid var(--border);border-radius:var(--r-sm)}
pre code{overflow-wrap:normal;white-space:pre}
:where(.wrap,.panel,.card,.prose,main,section,article,aside,nav,li,div){min-width:0}
.wrap{width:100%;max-width:calc(var(--wrap) + var(--gutter)*2);padding-inline:var(--gutter);margin-inline:auto}
.section{padding-top:72px;padding-bottom:72px}
.reading-wrap{max-width:850px;margin-inline:auto}
.prose{overflow-wrap:break-word;line-height:1.85}
.prose h2{margin-top:2em}
.prose h3{margin-top:1.7em}
.prose li+li{margin-top:.5em}
.no-break{white-space:nowrap}
.muted{color:var(--muted)}
.mono{font-family:var(--f-mono);font-variant-numeric:tabular-nums}
.panel,.card{padding:24px;border:1px solid var(--border);border-radius:var(--r-sm);background:var(--panel);box-shadow:var(--shadow-panel)}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.stack{display:grid;gap:24px}
.decor-region{position:relative;overflow-x:clip;max-width:100%}
.decor-grid{position:absolute;inset:0;pointer-events:none;background-image:linear-gradient(var(--grid-line) 1px,var(--clear) 1px),linear-gradient(90deg,var(--grid-line) 1px,var(--clear) 1px);background-size:44px 44px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:10px 22px;border:1px solid var(--clear);border-radius:var(--r-pill);font-size:var(--fs-body);font-weight:var(--weight-semi);line-height:22px;text-decoration:none;white-space:nowrap;flex-shrink:0;transition:transform var(--ease),box-shadow var(--ease),background-color var(--ease)}
.btn svg{width:14px;height:14px}
.btn-primary{background:var(--text);color:var(--panel);box-shadow:inset 0 1px 0 var(--hi-soft),0 10px 24px var(--tint-14)}
.btn-ghost,.btn-secondary{background:var(--panel);color:var(--text);border-color:var(--border);box-shadow:var(--shadow-small)}
.btn:hover,.btn.is-hover{transform:translateY(-1px);box-shadow:inset 0 1px 0 var(--hi-soft),0 12px 26px var(--tint-14)}
.btn:active,.btn.is-pressed{transform:translateY(0);box-shadow:inset 0 2px 5px var(--ink-10)}
.btn:disabled,.btn[aria-disabled="true"]{cursor:not-allowed;color:var(--muted);background:var(--panel-2);box-shadow:none;transform:none}
.cta-row{display:flex;justify-content:center;gap:12px;margin-bottom:16px;flex-wrap:wrap}
.reveal{transition:opacity var(--reveal-time) ease,transform var(--reveal-time) 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:32px}
#server-status+*{margin-top:24px}
#site-header{position:relative;z-index:100}
.topbar{position:relative;z-index:103;background:var(--bar-bg);border-bottom:1px solid var(--border);-webkit-backdrop-filter:saturate(1.2) blur(10px);backdrop-filter:saturate(1.2) blur(10px)}
.topbar-in{height:var(--header-h);display:flex;align-items:center;gap:24px;flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0;text-decoration:none;color:var(--text);font-family:var(--f-display);font-size:var(--fs-brand);font-weight:var(--weight-bold);letter-spacing:-.015em}
.brand img{display:block;width:28px;height:28px;flex-shrink:0}
.brand-zh{color:var(--muted);font-weight:var(--weight-medium)}
.mainnav{flex:1;min-width:0;margin-left:auto}
.mainnav ul{display:flex;align-items:center;justify-content:flex-end;list-style:none;margin:0;padding:0;gap:2px}
.mainnav li{flex-shrink:0}
.mainnav a{display:flex;align-items:center;justify-content:center;min-height:32px;padding:6px 12px;border-radius:var(--r-pill);color:var(--muted);text-decoration:none;font-size:var(--fs-nav);line-height:20px;white-space:nowrap;transition:color var(--ease),background-color var(--ease)}
.mainnav a:hover{color:var(--text)}
.mainnav a.is-current{background:var(--panel-2);color:var(--text);font-weight:var(--weight-semi)}
.tools{display:flex;align-items:center;gap:16px;flex-shrink:0}
.tools-sep{width:1px;height:18px;background:var(--border);flex-shrink:0}
.language{position:relative}
.lang-button{display:inline-flex;align-items:center;justify-content:center;gap:4px;width:auto;min-width:44px;min-height:32px;padding:4px 0;border:0;background:var(--clear);font-size:var(--fs-tool);color:var(--muted);white-space:nowrap}
.lang-button span{white-space:nowrap}
.lang-caret{font-size:var(--fs-tiny)}
.lang-panel{position:absolute;right:0;top:calc(100% + 10px);z-index:110;min-width:176px;padding:6px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:var(--shadow-panel)}
.lang-panel a{display:flex;align-items:center;min-height:40px;padding:8px 12px;text-decoration:none;border-radius:var(--r-xs);font-size:var(--fs-nav)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--panel-2)}
.login{display:inline-flex;align-items:center;justify-content:center;min-height:32px;padding:5px 16px;border-radius:var(--r-pill);background:var(--text);color:var(--panel);font-size:var(--fs-tool);font-weight:var(--weight-semi);line-height:22px;text-decoration:none;white-space:nowrap;box-shadow:inset 0 1px 0 var(--hi-soft)}
.menu-button{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;padding:8px;border:0;border-radius:var(--r-xs);background:var(--clear);color:var(--text)}
.menu-line{display:block;width:20px;height:2px;background:currentColor}
.menu-button[aria-expanded="true"] .menu-line:first-child{transform:translateY(6px) rotate(45deg)}
.menu-button[aria-expanded="true"] .menu-line:nth-child(2){opacity:0}
.menu-button[aria-expanded="true"] .menu-line:last-child{transform:translateY(-6px) rotate(-45deg)}
.nav-drawer{position:fixed;top:var(--header-h);right:0;left:0;z-index:102;height:calc(100dvh - var(--header-h));max-height:calc(100dvh - var(--header-h));padding:20px var(--gutter) 40px;background:var(--panel);overflow-y:auto;overscroll-behavior:contain}
.nav-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;border-radius:var(--r-sm);text-decoration:none}
.nav-drawer a:hover,.nav-drawer a.is-current{background:var(--panel-2)}
.drawer-languages{display:grid;border-top:1px solid var(--border);margin-top:16px;padding-top:16px}
.nav-veil{position:fixed;inset:var(--header-h) 0 0;z-index:101;border:0;background:var(--veil)}
html.nav-open{overflow:hidden}
.site-footer{padding-top:56px;padding-bottom:24px;border-top:1px solid var(--border);background:var(--bg-top)}
.footer-grid{display:grid;grid-template-columns:1.35fr 1fr 1fr;gap:48px}
.footer-brand p{max-width:340px;margin-top:20px;color:var(--muted)}
.footer-heading{margin-bottom:16px;font-size:var(--fs-note);font-family:var(--f-mono);font-weight:var(--weight-medium);color:var(--muted)}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 16px}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:28px;font-size:var(--fs-note);text-decoration:none;overflow-wrap:anywhere}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{color:var(--accent-dark)}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 24px;margin-top:32px}
.footer-languages a[aria-current="true"]{font-weight:var(--weight-bold)}
.footer-bottom{display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-top:24px;padding-top:20px;border-top:1px solid var(--border);color:var(--muted);font-size:var(--fs-note)}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px}
.footer-bottom p{margin:0}
@media(max-width:1200px){
  .mainnav a{padding-inline:9px}
  .topbar-in{gap:20px}
}
@media(max-width:1100px){
  .mainnav{display:none}
  .tools{margin-left:auto;gap:12px}
  .menu-button{display:inline-flex}
}
@media(min-width:1101px){
  .nav-drawer,.nav-veil{display:none!important}
}
@media(max-width:768px){
  h1{font-size:var(--fs-h1-mobile)}
  h2{font-size:28px}
  .section{padding-top:48px;padding-bottom:48px}
  .grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px}
  .footer-brand{grid-column:1/-1}
  .tools-sep{display:none}
  .tools{gap:8px;margin-left:auto}
  .lang-button{font-size:var(--fs-small)}
  .topbar-in{gap:12px}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .tilt{transform:none}
  .decor-region,.decor-grid{max-width:100%}
  .brand{gap:7px;font-size:var(--fs-body)}
  .brand img{width:24px;height:24px}
  .login{padding-inline:12px;font-size:var(--fs-note)}
  .topbar-in{gap:8px}
  .tools{gap:5px}
  .lang-button{gap:2px}
  .panel,.card{padding:20px}
  .footer-grid{grid-template-columns:1fr}
  .footer-brand{grid-column:auto}
}
@media(max-width:359px){
  .brand{font-size:var(--fs-nav);gap:5px}
  .tools{gap:2px}
  .login{padding-inline:9px}
  .lang-button{font-size:var(--fs-caption)}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none;transition:none}
  .btn,.mainnav a{transition:none}
  .btn:hover{transform:none}
}