:root{
  --c-bg:#F8F2E3;
  --c-hero-a:#FBF7EE;
  --c-hero-b:#F3EADA;
  --c-panel:#FFFCF6;
  --c-panel-glass:rgba(255,252,246,.78);
  --c-groove:#F0E6D2;
  --c-border:#E4D7BF;
  --c-line-strong:rgba(43,33,24,.28);
  --c-accent:#1F9D68;
  --c-accent-2:#22B07A;
  --c-accent-dark:#157A50;
  --c-accent-soft:rgba(31,157,104,.14);
  --c-notice:#DDF1E4;
  --c-text:#2B2118;
  --c-muted:#6E5F4E;
  --c-success:#2F8F4E;
  --c-success-soft:rgba(47,143,78,.13);
  --c-warn:#C9821A;
  --c-error:#C8432F;
  --c-peach:#F7C9B6;
  --c-lavender:#DCD0F2;
  --c-honey:#FBDB8C;
  --c-sea:#B4DFDF;
  --c-hl:#FFFFFF;
  --c-hl-soft:rgba(255,255,255,.55);
  --c-grid:rgba(43,33,24,.03);
  --c-glow:rgba(31,157,104,.06);
  --c-glow-fade:rgba(31,157,104,.025);
  --c-btn-ink:rgba(21,122,80,.45);
  --c-veil:rgba(43,33,24,.28);
  --c-shadow-ink:rgba(43,33,24,.06);
  --flag-red:#D52B2F;
  --flag-navy:#1B2B6B;
  --flag-blue:#23419A;
  --flag-white:#FFFFFF;
  --flag-ring:rgba(43,33,24,.14);
  --sh-soft:0 12px 28px rgba(31,157,104,.12);
  --sh-card:0 22px 48px rgba(31,157,104,.12),0 2px 6px rgba(43,33,24,.05);
  --sh-btn:0 8px 18px rgba(31,157,104,.30);
  --sh-win:0 18px 44px rgba(120,62,38,.16),0 2px 6px rgba(43,33,24,.06);
  --hl-edge:inset 0 1px 0 var(--c-hl);
  --f-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --f-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --f-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --fs-display:68px;
  --fs-body:17px;
  --fs-sub:20px;
  --fs-small:14px;
  --fs-nav:15px;
  --fs-h2:36px;
  --fs-h3:24px;
  --fw-display:800;
  --fw-bold:700;
  --fw-medium:600;
  --r-small:6px;
  --r-label:7px;
  --r-item:12px;
  --r-control:14px;
  --r-compact:16px;
  --r-tile:18px;
  --r-tray:24px;
  --r-card:28px;
  --r-peek:32px;
  --r-win:20px;
  --r-pill:999px;
  --r-round:50%;
  --gutter:24px;
  --wrap-width:1240px;
  --header-height:72px;
  --anchor-offset:88px;
  --toc-offset:96px;
  --overlap:170px;
  --grid-size:48px;
  --ease-time:.2s;
  --reveal-time:.65s;
  --section-space:80px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
html.nav-open{overflow:hidden}
body{margin:0;background:var(--c-bg);color:var(--c-text);font-family:var(--f-body);font-size:var(--fs-body);line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
body{background-image:linear-gradient(var(--c-grid) 1px,transparent 1px),linear-gradient(90deg,var(--c-grid) 1px,transparent 1px);background-size:var(--grid-size) var(--grid-size)}
a{color:inherit;text-underline-offset:4px}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0;vertical-align:middle}
svg:not([width]){width:24px;height:24px}
p{margin:0}
ul,ol{padding-left:1.4em}
h1,h2,h3,h4{font-family:var(--f-display);line-height:1.25;text-wrap:balance;overflow-wrap:break-word}
h1{font-size:clamp(52px,5vw,72px);font-weight:var(--fw-display);letter-spacing:-.02em;line-height:1.1}
h2{font-size:var(--fs-h2);font-weight:var(--fw-display);letter-spacing:-.02em}
h3{font-size:var(--fs-h3);font-weight:var(--fw-bold)}
h1,h2,h3{margin-top:0}
:focus-visible{outline:2px solid var(--c-accent-dark);outline-offset:3px;border-radius:var(--r-small)}
[hidden]{display:none!important}
.no-break{white-space:nowrap}
.wrap{width:100%;max-width:var(--wrap-width);margin-inline:auto;padding-inline:var(--gutter)}
.sec{padding-top:var(--section-space);padding-bottom:var(--section-space)}
.grid{display:grid;gap:24px}
.grid--two{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--three{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid>*{min-width:0}
.stack{display:flex;flex-direction:column;gap:20px;min-width:0}
.row{display:flex;align-items:center;flex-wrap:wrap;gap:14px;min-width:0}
.muted{color:var(--c-muted)}
.mono{font-family:var(--f-mono);font-variant-numeric:tabular-nums}
.section-label{font-size:var(--fs-small);font-weight:var(--fw-bold);letter-spacing:.08em;text-transform:uppercase;color:var(--c-accent-dark)}
.panel,.card{min-width:0;padding:28px;background:var(--c-panel);border:1px solid var(--c-border);border-radius:var(--r-card);box-shadow:var(--sh-soft),var(--hl-edge)}
.panel--groove{background:var(--c-groove);box-shadow:var(--hl-edge)}
.decor-section{position:relative;overflow-x:clip;max-width:100%}
code{font-family:var(--f-mono);font-size:.9em;overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--c-groove);border:1px solid var(--c-border);border-radius:var(--r-control)}
pre code{white-space:pre;overflow-wrap:normal}
.prose{min-width:0;overflow-wrap:break-word}
.prose p,.prose ul,.prose ol,.prose pre,.prose blockquote{margin-block:0 24px}
.prose h2{margin-top:48px}
.prose h3{margin-top:32px}
.prose li+li{margin-top:8px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;min-width:24px;padding:10px 24px;border:1.5px solid var(--c-line-strong);border-radius:var(--r-pill);background:var(--c-panel);font-size:var(--fs-nav);font-weight:var(--fw-bold);text-decoration:none;line-height:1.4;white-space:nowrap;flex-shrink:0;transition:transform var(--ease-time),background var(--ease-time),box-shadow var(--ease-time)}
.btn:hover{transform:translateY(-1px);border-color:var(--c-text)}
.btn:active,.btn.is-active{transform:translateY(1px);box-shadow:var(--hl-edge)}
.btn-primary{border-color:var(--c-accent-dark);color:var(--c-panel);background:linear-gradient(135deg,var(--c-accent-2),var(--c-accent));box-shadow:var(--sh-btn),inset 0 1px 0 var(--c-hl-soft)}
.btn-primary:hover,.btn-primary.is-hover{background:linear-gradient(135deg,var(--c-accent),var(--c-accent-dark));box-shadow:var(--sh-soft)}
.btn-secondary{background:var(--c-panel-glass)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.55;cursor:not-allowed;transform:none;box-shadow:none}
.btn.is-focus{outline:2px solid var(--c-accent-dark);outline-offset:3px}
.link-more{display:inline-flex;align-items:center;min-height:28px;font-weight:var(--fw-medium);text-decoration:underline}
.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:relative;display:block;min-width:0;max-width:100%;min-height:120px;overflow:hidden;margin-block:32px}
#server-status>*{min-width:0;max-width:100%}
#server-status+*{margin-top:32px}
.topbar{background:var(--c-hero-a);position:relative;z-index:50}
.topbar__in{max-width:1360px;margin:0 auto;height:var(--header-height);padding:0 40px;display:flex;align-items:center;justify-content:space-between;gap:24px;position:relative}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;flex-shrink:0}
.brand__mark{width:30px;height:30px}
.brand__en{font-family:var(--f-display);font-weight:var(--fw-display);font-size:21px;letter-spacing:-.02em;color:var(--c-text)}
.brand__zh{font-weight:500;font-size:var(--fs-nav);color:var(--c-muted)}
.mainnav{min-width:0}
.mainnav ul{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:30px}
.mainnav a{display:block;padding:8px 0;font-size:var(--fs-nav);font-weight:500;color:var(--c-muted);text-decoration:none;white-space:nowrap;transition:color var(--ease-time)}
.mainnav a:hover{color:var(--c-text)}
.mainnav a[aria-current="page"]{color:var(--c-text);font-weight:var(--fw-bold)}
.topbar__end{display:flex;align-items:center;gap:18px;flex-shrink:0}
.lang-wrap{position:relative}
.lang{appearance:none;border:0;background:none;padding:6px 2px;min-height:32px;min-width:24px;font-size:var(--fs-small);font-weight:500;color:var(--c-muted)}
.lang:hover{color:var(--c-text)}
.lang-menu{position:absolute;right:0;top:calc(100% + 10px);width:180px;padding:8px;background:var(--c-panel);border:1px solid var(--c-border);border-radius:var(--r-control);box-shadow:var(--sh-card);z-index:55}
.lang-menu a{display:flex;align-items:center;min-height:44px;padding:8px 12px;text-decoration:none;border-radius:var(--r-small);font-size:var(--fs-small)}
.lang-menu a:hover,.lang-menu a[aria-current]{background:var(--c-groove)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;height:42px;padding:0 22px;border:1.5px solid var(--c-text);border-radius:var(--r-pill);background:var(--c-panel);font-size:var(--fs-nav);font-weight:var(--fw-bold);color:var(--c-text);text-decoration:none;white-space:nowrap;transition:background var(--ease-time),color var(--ease-time)}
.btn-login:hover{background:var(--c-text);color:var(--c-panel)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;border:1px solid var(--c-border);background:var(--c-panel);border-radius:var(--r-item);font-size:var(--fs-sub)}
.mobile-nav{display:none;position:absolute;left:0;right:0;top:100%;padding:16px var(--gutter);background:var(--c-panel);border-bottom:1px solid var(--c-border);box-shadow:var(--sh-card);max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;z-index:54}
.mobile-nav ul{list-style:none;margin:0;padding:0}
.mobile-nav a{display:flex;align-items:center;width:100%;min-height:46px;padding:10px 16px;text-decoration:none;border-radius:var(--r-item);font-size:var(--fs-nav)}
.mobile-nav a:hover,.mobile-nav a[aria-current]{background:var(--c-groove);font-weight:var(--fw-bold)}
.mobile-nav__languages{margin-top:12px;padding-top:12px;border-top:1px solid var(--c-border)}
.nav-veil{position:fixed;inset:var(--header-height) 0 0;z-index:40;border:0;background:var(--c-veil)}
.notice{background:var(--c-notice);color:var(--c-accent-dark)}
.notice__in{max-width:1360px;margin:0 auto;min-height:44px;padding:8px 24px;display:flex;align-items:center;justify-content:center;gap:14px;flex-wrap:wrap;font-size:var(--fs-nav)}
.notice__tag{display:inline-flex;align-items:center;height:24px;padding:0 9px;border-radius:var(--r-label);background:var(--c-accent-dark);color:var(--c-panel);font-size:12.5px;font-weight:var(--fw-bold);letter-spacing:.04em}
.notice__txt{min-width:0}
.notice__link{font-weight:var(--fw-bold);text-decoration:underline;text-underline-offset:4px;text-decoration-thickness:1.5px;min-height:24px}
.site-footer{background:var(--c-groove);border-top:1px solid var(--c-border);padding-top:56px;padding-bottom:28px}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1.2fr .8fr;gap:32px}
.footer-grid>*{min-width:0}
.footer-brand p{margin-top:18px;color:var(--c-muted);font-size:var(--fs-nav)}
.footer-heading{font-size:var(--fs-small);font-weight:var(--fw-bold);margin:0 0 12px}
.footer-links{list-style:none;margin:0;padding:0}
.footer-links a{display:inline-flex;align-items:center;min-height:32px;font-size:var(--fs-small);color:var(--c-text);text-decoration:none}
.footer-links a:hover{text-decoration:underline}
.footer-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:16px;margin-top:40px;padding-top:20px;border-top:1px solid var(--c-border);font-size:var(--fs-small);color:var(--c-muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:16px}
.footer-legal a{display:inline-flex;align-items:center;min-height:24px}
@media(max-width:1199px){
  .mainnav ul{gap:20px}
  .mainnav a{font-size:var(--fs-small)}
  .topbar__in{padding-inline:24px;gap:18px}
}
@media(max-width:1023px){
  .mainnav{display:none}
  .topbar__end{margin-left:auto}
  .menu-toggle{display:inline-flex}
  .mobile-nav:not([hidden]){display:block}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:768px){
  :root{--header-height:64px;--overlap:120px;--section-space:56px;--fs-h2:28px;--fs-h3:22px}
  h1{font-size:38px}
  .topbar__in{padding-inline:16px;gap:10px}
  .topbar__end{margin-left:auto;gap:8px}
  .brand__zh{font-size:13px}
  .lang-wrap{display:none}
  .btn-login{height:38px;padding:0 16px;font-size:var(--fs-small)}
  .notice__in{font-size:13.5px;gap:8px 10px}
  .grid--two,.grid--three{grid-template-columns:minmax(0,1fr)}
  .decor-section{max-width:100%;overflow-x:clip}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .tilt,.decor-tilt{transform:none}
  .wrap{padding-inline:var(--gutter)}
  .card,.panel{padding:20px}
  .footer-grid{grid-template-columns:minmax(0,1fr)}
  .footer-bottom{flex-direction:column}
  h1{font-size:clamp(28px,9vw,38px)}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none;transition:none}
  .btn,.btn:hover{transition:none;transform:none}
}