:root{
  --bg:#F6F6F4;
  --bg-top:#FBFBFA;
  --bg-bottom:#F0EFEC;
  --panel:#FFFFFF;
  --panel-2:#EDEDEA;
  --border:#DEDDD8;
  --accent:#E5402B;
  --accent-dark:#B8301E;
  --accent-2:#FF8A4C;
  --peach:#FBE9E3;
  --text:#1C1C1E;
  --ink-2:#3A3A3E;
  --muted:#6B6B70;
  --success:#1F9D55;
  --warn:#C98A0B;
  --error:#9F1D1D;
  --on-dark:#FFFFFF;
  --alu-1:#ECEBE7;
  --alu-2:#CBCAC4;
  --tl-close:#EE6A5F;
  --tl-min:#F2BC52;
  --tl-max:#62C258;
  --flag-red:#D52B1E;
  --flag-blue-us:#2A3B8F;
  --flag-blue-nl:#21468B;
  --glass:rgb(255 255 255 / .84);
  --hi:rgb(255 255 255 / .22);
  --hi-strong:rgb(255 255 255 / .6);
  --veil:rgb(28 28 30 / .22);
  --tint-5:color-mix(in srgb,var(--accent) 5%,transparent);
  --tint-10:color-mix(in srgb,var(--accent) 10%,transparent);
  --tint-14:color-mix(in srgb,var(--accent) 14%,transparent);
  --tint-24:color-mix(in srgb,var(--accent) 24%,transparent);
  --halftone:color-mix(in srgb,var(--accent) 6%,transparent);
  --glow:color-mix(in srgb,var(--accent) 6%,transparent);
  --glow-2:color-mix(in srgb,var(--accent-2) 4%,transparent);
  --screen-a:color-mix(in srgb,var(--accent) 74%,var(--peach));
  --screen-b:color-mix(in srgb,var(--accent-2) 66%,var(--peach));
  --stamp-ring:color-mix(in srgb,var(--accent-dark) 45%,transparent);
  --nav-glass:color-mix(in srgb,var(--panel) 82%,transparent);
  --chip-glass:color-mix(in srgb,var(--panel) 78%,transparent);
  --success-tint:color-mix(in srgb,var(--success) 20%,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","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --r-pill:999px;
  --r-round:50%;
  --r-tray:34px;
  --r-lg:24px;
  --r-md:14px;
  --r-sm:8px;
  --r-xs:4px;
  --r-flag:3px;
  --r-device:32px;
  --r-screen:26px;
  --r-glass:18px;
  --r-lid:13px;
  --r-tiny:6px;
  --r-segment:9px;
  --r-segment-in:7px;
  --r-window:10px;
  --r-line:12px;
  --wrap:1200px;
  --reading:800px;
  --gutter:24px;
  --header-height:104px;
  --toc-height:64px;
  --anchor-offset:calc(var(--header-height) + var(--toc-height) + 16px);
  --shadow-soft:0 22px 40px var(--tint-10);
  --shadow-panel:0 14px 30px var(--tint-10);
  --ease-ui:cubic-bezier(.2,.7,.2,1);
  --duration-ui:.2s;
  --duration-reveal:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{margin:0;scroll-behavior:smooth;scroll-padding-top:calc(var(--header-height) + 16px)}
body{margin:0;font-family:var(--font-body);font-size:16px;line-height:1.7;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
html.nav-open{overflow:hidden}
html.region-dismissed{--header-height:60px}
[hidden]{display:none!important}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0;vertical-align:middle}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button,a,summary{-webkit-tap-highlight-color:var(--tint-10)}
button:disabled{cursor:not-allowed}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
::selection{background:var(--peach);color:var(--text)}
h1,h2,h3,h4{font-family:var(--font-display);color:var(--text);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:clamp(52px,4.5vw,64px);line-height:1.12;letter-spacing:-.02em;font-weight:800}
h2{font-size:clamp(32px,3.6vw,48px);line-height:1.15;letter-spacing:-.02em;font-weight:800}
h3{font-size:24px;line-height:1.35;letter-spacing:-.01em}
p{margin-top:0}
.no-break{white-space:nowrap}
.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)}
.section{padding-top:80px;padding-bottom:88px}
.section-head{max-width:840px;margin:0 auto 40px;text-align:center}
.section-head h2{margin:0}
.section-head p{margin:16px 0 0;font-size:19px;color:var(--muted)}
.grid{display:grid;gap:24px}
.grid>*{min-width:0}
.grid--two{grid-template-columns:repeat(2,minmax(0,1fr))}
.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(--muted)}
.mono{font-family:var(--font-mono)}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.ico{fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.icon{width:20px;height:20px}
.prose{overflow-wrap:break-word;min-width:0}
.prose h2{margin-top:56px;font-size:32px}
.prose h3{margin-top:32px}
.prose p,.prose li{line-height:1.9}
.prose a{color:var(--accent-dark);text-decoration:underline;text-underline-offset:4px}
.prose img{border-radius:var(--r-md)}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere;background:var(--panel-2);border-radius:var(--r-xs);padding:.12em .3em}
pre{max-width:100%;overflow-x:auto;background:var(--panel-2);border-radius:var(--r-md);padding:24px;line-height:1.7}
pre code{padding:0;white-space:pre;overflow-wrap:normal;background:transparent}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:0 30px;border:0;border-radius:var(--r-pill);font-family:var(--font-body);font-size:17px;line-height:1.3;font-weight:600;letter-spacing:-.005em;flex-shrink:0;white-space:nowrap;transition:background var(--duration-ui),box-shadow var(--duration-ui),transform var(--duration-ui)}
.btn--solid,.btn-primary{background:var(--accent);color:var(--on-dark);box-shadow:0 12px 26px var(--tint-24)}
.btn--solid:hover,.btn-primary:hover,.btn--hover{background:var(--accent-dark)}
.btn--line,.btn-secondary{background:transparent;color:var(--accent-dark);box-shadow:inset 0 0 0 1px var(--accent)}
.btn--line:hover,.btn-secondary:hover{background:var(--tint-10)}
.btn--ink{background:var(--text);color:var(--on-dark)}
.btn--ink:hover{background:var(--ink-2)}
.btn--small{min-height:36px;padding-inline:18px;font-size:14px}
.btn:active{transform:translateY(1px)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.5;box-shadow:none;pointer-events:none}
.cta-pair{margin-top:26px;display:flex;justify-content:center;gap:14px;flex-wrap:wrap}
.panel{padding:32px;background:var(--panel);border-radius:var(--r-lg);box-shadow:inset 0 1px 0 var(--hi-strong),var(--shadow-panel);min-width:0}
.card{padding:28px;background:var(--panel);border-radius:var(--r-md);min-width:0}
.reveal{transition:opacity var(--duration-reveal) var(--ease-ui),transform var(--duration-reveal) var(--ease-ui)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{display:block;position:relative;overflow:hidden;min-width:0;max-width:100%;margin-block:32px}
#server-status+*{margin-top:32px}
#server-status>*{min-width:0;max-width:100%}
[data-parallax-decor],.decor-section{overflow-x:clip}
[data-counter]{display:inline-block;min-width:3ch;font-variant-numeric:tabular-nums;font-family:var(--font-mono);text-align:right}
.locale-strip{background:var(--panel-2);color:var(--muted);font-size:13px}
.locale-strip__in{max-width:var(--wrap);margin:0 auto;padding:0 var(--gutter);min-height:44px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.locale-strip__msg{margin:0;line-height:1.4}
.locale-strip__act{display:flex;align-items:center;gap:10px;flex-shrink:0}
.region-field{display:inline-flex;align-items:center;gap:8px;height:30px;padding:0 12px;border-radius:var(--r-sm);background:var(--panel);color:var(--text);font-size:13px;box-shadow:inset 0 0 0 1px var(--border)}
.region-field svg{width:12px;height:12px}
.ink-pill{display:inline-flex;align-items:center;justify-content:center;min-height:30px;padding:0 16px;border-radius:var(--r-pill);background:var(--text);color:var(--on-dark);font-size:13px;font-weight:600;white-space:nowrap;transition:background var(--duration-ui)}
.ink-pill:hover{background:var(--ink-2)}
.strip-close{width:28px;height:28px;display:grid;place-items:center;border:0;background:transparent;border-radius:var(--r-round);cursor:pointer;color:var(--muted);flex-shrink:0}
.strip-close:hover{background:var(--border)}
.strip-close svg{width:14px;height:14px}
#site-header{position:sticky;top:0;z-index:60}
.topnav{background:var(--nav-glass);border-bottom:1px solid var(--border);position:relative;z-index:60}
.topnav::before{content:"";position:absolute;inset:0;backdrop-filter:blur(14px);z-index:-1;pointer-events:none}
.topnav__in{max-width:var(--wrap);margin:0 auto;padding:0 var(--gutter);height:60px;display:flex;align-items:center;gap:24px;flex-wrap:nowrap}
.brandmark{display:inline-flex;align-items:center;gap:9px;flex:none}
.brandmark img{width:28px;height:28px}
.brandmark__word{font-family:var(--font-display);font-size:19px;font-weight:800;letter-spacing:-.02em;white-space:nowrap}
.brandmark__zh{font-weight:500;color:var(--muted)}
.desktop-nav{flex:1;min-width:0}
.navlist{list-style:none;margin:0;padding:0;display:flex;align-items:center;justify-content:center;gap:2px}
.navlist li{min-width:0}
.navlist a{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:34px;padding:0 11px;border-radius:var(--r-pill);font-size:14px;white-space:nowrap;color:var(--text);transition:background var(--duration-ui)}
.navlist a svg{width:16px;height:16px;color:var(--muted)}
.navlist a:hover{background:var(--panel-2)}
.navlist a[aria-current="page"]{background:var(--panel-2);font-weight:600}
.navlist a[aria-current="page"] svg{color:var(--text)}
.navtail{display:flex;align-items:center;gap:8px;flex:none;margin-left:auto}
.lang-wrap{position:relative}
.lang-pick{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:34px;min-width:44px;width:auto;padding:0 10px;border:0;background:transparent;border-radius:var(--r-pill);font-size:14px;color:var(--muted);white-space:nowrap}
.lang-pick span{white-space:nowrap}
.lang-pick svg{width:16px;height:16px}
.lang-pick:hover{background:var(--panel-2)}
.lang-panel{position:absolute;right:0;top:calc(100% + 12px);z-index:100;width:184px;padding:8px;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:44px;padding:8px 12px;border-radius:var(--r-sm);font-size:14px}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--panel-2)}
.login-btn{display:inline-flex;align-items:center;justify-content:center;min-height:34px;padding:0 18px;border-radius:var(--r-pill);background:var(--text);color:var(--on-dark);font-size:14px;font-weight:600;white-space:nowrap;transition:background var(--duration-ui)}
.login-btn:hover{background:var(--ink-2)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;padding:0;border:0;background:transparent;border-radius:var(--r-sm)}
.menu-toggle svg{width:22px;height:22px}
.mobile-drawer{position:fixed;top:var(--header-height);right:0;left:0;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;background:var(--panel);z-index:55;padding:20px var(--gutter) 40px}
.mobile-drawer a{display:flex;align-items:center;gap:12px;width:100%;min-height:48px;padding:12px 16px;border-radius:var(--r-sm)}
.mobile-drawer a svg{width:18px;height:18px}
.mobile-drawer a:hover,.mobile-drawer a[aria-current="page"]{background:var(--panel-2)}
.drawer-languages{border-top:1px solid var(--border);margin-top:16px;padding-top:16px}
.drawer-languages a[aria-current="true"]{font-weight:700;color:var(--accent-dark)}
.nav-veil{position:fixed;inset:var(--header-height) 0 0;background:var(--veil);z-index:50;border:0;width:100%}
.site-footer{background:var(--panel-2);padding-top:56px;padding-bottom:24px;font-size:14px}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:48px}
.footer-grid>*{min-width:0}
.footer-brand p{max-width:340px;margin:18px 0 0;color:var(--muted)}
.footer-title{font-size:14px;font-weight:700;margin:0 0 12px}
.footer-links{list-style:none;margin:0;padding:0;display:grid;gap:4px}
.footer-links a{display:inline-flex;align-items:center;min-height:30px}
.footer-links a:hover,.footer-languages a:hover,.footer-bottom a:hover{color:var(--accent-dark);text-decoration:underline;text-underline-offset:4px}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:32px}
.footer-languages a{min-height:30px;display:inline-flex;align-items:center}
.footer-languages a[aria-current="true"]{font-weight:700}
.footer-bottom{border-top:1px solid var(--border);margin-top:24px;padding-top:20px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;color:var(--muted)}
.footer-bottom p{margin:0}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px}
.footer-legal a{display:inline-flex;min-height:24px;align-items:center}
@media(min-width:1101px){.mobile-drawer,.nav-veil{display:none!important}}
@media(max-width:1100px){
  .desktop-nav{display:none}
  .menu-toggle{display:inline-flex}
  .navtail{margin-left:auto}
  .topnav__in{gap:16px}
}
@media(max-width:768px){
  h1{font-size:clamp(28px,5.2vw,40px)}
  h2{font-size:34px}
  .grid--three{grid-template-columns:1fr}
  .grid--five{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .footer-brand{grid-column:1/-1}
  .section{padding-top:56px;padding-bottom:64px}
}
@media(max-width:640px){
  :root{--gutter:16px;--header-height:112px}
  html.region-dismissed{--header-height:60px}
  .no-break{white-space:normal}
  .locale-strip__in{min-height:52px;gap:8px}
  .locale-strip__msg{font-size:11px;max-width:190px}
  .locale-strip__act{gap:4px}
  .region-field{display:none}
  .ink-pill{font-size:11px;padding-inline:10px}
  .topnav__in{gap:8px}
  .brandmark{gap:6px}
  .brandmark img{width:24px;height:24px}
  .brandmark__word{font-size:17px}
  .navtail{gap:2px;margin-left:auto}
  .lang-pick{font-size:12px;padding-inline:6px;gap:4px}
  .lang-pick svg{width:14px;height:14px}
  .login-btn{font-size:13px;padding-inline:12px}
  .grid--two{grid-template-columns:1fr}
  .panel,.card{padding:24px}
  .tilt,.tilt-decor{transform:none}
  [data-parallax-decor],.decor-section{max-width:100%}
  .footer-grid{grid-template-columns:1fr 1fr;gap:24px}
  .footer-bottom{display:block}
  .footer-legal{margin-top:12px}
  .prose h2{font-size:28px}
  .btn{padding-inline:24px;font-size:16px}
}
@media(max-width:359px){
  .brandmark__word{font-size:15px}
  .brandmark img{width:22px;height:22px}
  .lang-pick{font-size:11px;padding-inline:4px}
  .lang-pick svg{display:none}
  .login-btn{padding-inline:10px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}