:root{
  color-scheme:light;
  --bg:#F7F1E4;
  --bg-panel:#FFFCF5;
  --bg-panel-2:#EFE6D3;
  --bg-soft:#F8F2E6;
  --border:#E2D6BF;
  --border-strong:#D3C4A6;
  --accent:#348F2A;
  --accent-dark:#236B1C;
  --accent-glow:#B4D04F;
  --text:#2A2118;
  --text-muted:#6E6152;
  --text-faint:#9A8B77;
  --success:#2E8A57;
  --warn:#C47F0E;
  --error:#C23B2A;
  --ink-rgb:42 33 24;
  --paper-rgb:255 252 245;
  --accent-rgb:52 143 42;
  --warn-rgb:196 127 14;
  --hero-top:#FBF7EE;
  --hero-bottom:#F1E8D6;
  --stage-a:#E9D9B8;
  --stage-m:#A97F4C;
  --stage-b:#3A2A1E;
  --win:#231B14;
  --win-side:#1C1510;
  --win-raise:#2E241B;
  --win-text:#EFE5D3;
  --win-muted:#A69782;
  --win-faint:#7A6C5C;
  --btn-ink:#231B14;
  --flag-red:#C8372D;
  --flag-blue:#2D3F72;
  --flag-white:#FBF8F1;
  --flag-green:#2F8A4E;
  --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,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,"Liberation Mono",monospace;
  --r-pill:999px;
  --r-stage:28px;
  --r-win:14px;
  --r-card:12px;
  --r-chip:7px;
  --r-row:8px;
  --r-note:10px;
  --r-tiny:3px;
  --r-square:2px;
  --r-type:5px;
  --r-round:50%;
  --r-mobile-stage:22px;
  --max:1200px;
  --gutter:32px;
  --wrap-max:1264px;
  --reading-max:800px;
  --dot-gap:24px;
  --dot-a:.07;
  --body-size:16px;
  --display-size:clamp(52px,4.45vw,64px);
  --section-size:clamp(28px,3vw,40px);
  --small-size:14px;
  --nav-height:64px;
  --anchor-gap:88px;
  --toc-offset:12px;
  --toc-clearance:104px;
  --shadow-paper:inset 0 1px 0 rgb(var(--paper-rgb)),0 16px 40px -16px rgb(var(--ink-rgb) / .12),0 3px 10px rgb(var(--ink-rgb) / .08);
  --ease-ui:.2s ease;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-gap);scroll-behavior:smooth}
body{margin:0;background-color:var(--bg);background-image:radial-gradient(circle at 1px 1px,rgb(var(--ink-rgb) / var(--dot-a)) 1px,transparent 1.5px);background-size:var(--dot-gap) var(--dot-gap);color:var(--text);font-family:var(--font-body);font-size:var(--body-size);line-height:1.6;overflow-x:clip;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
img,video{max-width:100%;height:auto}
svg{flex-shrink:0}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button,a{-webkit-tap-highlight-color:rgb(var(--accent-rgb) / .12)}
a{color:inherit;text-decoration:none}
button:disabled{cursor:not-allowed}
[hidden]{display:none!important}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--accent-dark);outline-offset:4px}
::selection{background:rgb(var(--accent-rgb) / .18);color:var(--text)}
h1,h2,h3{font-family:var(--font-display);text-wrap:balance;overflow-wrap:break-word}
h1{margin:0 0 24px;font-size:var(--display-size);font-weight:900;line-height:1.12;letter-spacing:-.02em}
h2{margin:0 0 24px;font-size:var(--section-size);font-weight:800;line-height:1.25;letter-spacing:-.015em}
h3{margin:0 0 12px;font-size:22px;font-weight:750;line-height:1.4}
p{margin:0 0 20px}
ul,ol{padding-left:1.5em}
li+li{margin-top:6px}
strong{font-weight:650}
small{font-size:var(--small-size)}
code,kbd,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere;word-break:break-word;background:var(--bg-panel-2);border-radius:var(--r-tiny);padding:.1em .3em;font-size:.9em}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--win);color:var(--win-text);border-radius:var(--r-card);line-height:1.7}
pre code{padding:0;background:none;color:inherit;white-space:pre;overflow-wrap:normal;word-break:normal}
hr{margin:32px 0;border:0;border-top:1px solid var(--border)}
.wrap{width:100%;max-width:var(--wrap-max);padding-inline:var(--gutter);margin-inline:auto}
.reading-wrap{width:100%;max-width:calc(var(--reading-max) + var(--gutter) * 2);padding-inline:var(--gutter);margin-inline:auto}
.section{padding-top:80px;padding-bottom:80px}
.section-head{max-width:720px;margin-bottom:32px}
.section-head p,.muted{color:var(--text-muted)}
.kicker{margin:0 0 12px;font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--text-muted)}
.no-break{white-space:nowrap}
.grid{display:grid;gap:24px}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-5{grid-template-columns:repeat(5,minmax(0,1fr))}
.grid>*,.nav>*,.footer-grid>*,.inspector>*{min-width:0}
.panel,.card{padding:28px;border:1px solid var(--border);border-radius:var(--r-card);background:var(--bg-panel);box-shadow:var(--shadow-paper)}
.panel-inset{padding:24px;background:var(--bg-panel-2);border-radius:var(--r-card);box-shadow:inset 0 1px 3px rgb(var(--ink-rgb) / .08)}
.prose{overflow-wrap:break-word}
.prose p,.prose li{line-height:1.85}
.prose h2{margin-top:56px}
.prose h3{margin-top:32px}
.prose a:not(.btn){text-decoration:underline;text-underline-offset:4px}
.prose section{min-width:0}
.prose ol>li::marker{font-family:var(--font-mono);font-weight:700;color:var(--text-muted)}
.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 .6s ease,transform .6s 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:80px;overflow:hidden;margin-block:24px}
#server-status+*{margin-top:32px}
#server-status>*{min-width:0;max-width:100%}

.btn{min-height:54px;display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:0 28px;border-radius:var(--r-pill);font-family:var(--font-body);font-size:16px;font-weight:600;letter-spacing:.01em;line-height:1.4;white-space:nowrap;flex-shrink:0;transition:transform var(--ease-ui),box-shadow var(--ease-ui),border-color var(--ease-ui)}
.btn svg{width:18px;height:18px;flex:none}
.btn-main,.btn-primary{color:var(--bg-panel);border:0;border-bottom:3px solid transparent;padding-top:3px;background:linear-gradient(var(--btn-ink),var(--btn-ink)) padding-box,linear-gradient(90deg,var(--accent),var(--accent-glow)) border-box;box-shadow:0 12px 24px -12px rgb(var(--accent-rgb) / .6),0 4px 12px rgb(var(--ink-rgb) / .18),inset 0 1px 0 rgb(var(--paper-rgb) / .12)}
.btn-main:hover,.btn-primary:hover,.btn.is-hover{transform:translateY(-1px);box-shadow:0 16px 28px -12px rgb(var(--accent-rgb) / .7),0 6px 14px rgb(var(--ink-rgb) / .2),inset 0 1px 0 rgb(var(--paper-rgb) / .12)}
.btn-ghost,.btn-secondary{color:var(--text);background:rgb(var(--paper-rgb) / .62);border:1.5px solid var(--border-strong);box-shadow:inset 0 1px 0 rgb(var(--paper-rgb))}
.btn-ghost:hover,.btn-secondary:hover{border-color:var(--text-faint);transform:translateY(-1px)}
.btn:active,.btn.is-active{transform:translateY(1px);box-shadow:inset 0 2px 5px rgb(var(--ink-rgb) / .2)}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--bg-panel-2);border:1px solid var(--border);color:var(--text-muted);box-shadow:none;transform:none}
.btn.is-focus{outline:2px solid var(--accent-dark);outline-offset:4px}
.btn-main .arr{width:17px;height:17px;margin-left:2px}
.cta-row{margin-top:24px;display:flex;flex-wrap:wrap;justify-content:center;gap:14px}

#site-header{position:relative;z-index:50}
.nav{height:var(--nav-height);display:flex;align-items:center;gap:28px;position:relative;z-index:50}
.brand{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:800;font-size:19px;letter-spacing:-.02em;color:var(--text);flex:none;min-height:32px}
.brand .logo{width:32px;height:32px;flex:none;filter:drop-shadow(0 4px 8px rgb(var(--ink-rgb) / .16))}
.brand-zh{font-size:15px;font-weight:500;color:var(--text-muted)}
.desktop-nav{margin-inline:auto}
.menu{display:flex;align-items:center;list-style:none;margin:0;padding:0;font-size:14.5px;color:var(--text-muted)}
.menu li{display:flex;align-items:center;flex:none;margin:0}
.menu li+li::before{content:"·";margin:0 13px;color:var(--text-faint);font-weight:700}
.menu a{display:inline-flex;align-items:center;gap:6px;min-height:32px;padding:6px 2px;transition:color var(--ease-ui)}
.menu a:hover{color:var(--text)}
.menu a[aria-current="page"]{color:var(--text);font-weight:600}
.pip{width:7px;height:7px;border-radius:var(--r-round);background:var(--warn);box-shadow:0 0 0 3px rgb(var(--warn-rgb) / .18);flex:none}
.tag-new{font-size:11px;font-weight:600;line-height:1;padding:4px 7px;border-radius:var(--r-pill);background:var(--text);color:var(--bg-panel)}
.nav-end{display:flex;align-items:center;gap:10px;flex:none;margin-left:auto}
.lang-wrap{position:relative}
.lang{appearance:none;border:0;background:none;font:inherit;font-size:14px;color:var(--text-muted);min-width:44px;width:auto;height:38px;padding:0 12px;border-radius:var(--r-pill);cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:6px}
.lang span{white-space:nowrap}
.lang:hover{background:rgb(var(--ink-rgb) / .05);color:var(--text)}
.lang svg{width:16px;height:16px}
.lang .caret{font-size:11px}
.lang-menu{position:absolute;right:0;top:calc(100% + 10px);min-width:176px;padding:8px;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--r-card);box-shadow:var(--shadow-paper);z-index:55}
.lang-menu a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-chip);font-size:14px}
.lang-menu a:hover,.lang-menu a[aria-current]{background:var(--bg-panel-2)}
.login{height:38px;padding:0 20px;display:inline-flex;align-items:center;justify-content:center;border-radius:var(--r-pill);background:var(--bg-panel);border:1px solid var(--border-strong);font-size:14px;font-weight:600;color:var(--text);white-space:nowrap;box-shadow:inset 0 1px 0 rgb(var(--paper-rgb)),0 2px 6px rgb(var(--ink-rgb) / .06);transition:border-color var(--ease-ui),box-shadow var(--ease-ui)}
.login:hover{border-color:var(--text-faint);box-shadow:inset 0 1px 0 rgb(var(--paper-rgb)),0 4px 10px rgb(var(--ink-rgb) / .1)}
.burger{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;border:1px solid var(--border-strong);border-radius:var(--r-pill);background:var(--bg-panel)}
.burger svg{width:20px;height:20px}
.mobile-drawer{display:none}
html.nav-open{overflow:hidden}
.nav-veil{position:fixed;inset:var(--nav-height) 0 0;background:rgb(var(--ink-rgb) / .24);z-index:45}
.site-footer{padding-top:56px;padding-bottom:28px;border-top:1px solid var(--border);background:rgb(var(--paper-rgb) / .48)}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:48px}
.footer-brand p{max-width:30em;margin-top:16px;color:var(--text-muted);font-size:14px}
.footer-heading{font-size:14px;font-weight:700;margin-bottom:12px}
.footer-links{display:flex;flex-wrap:wrap;gap:4px 18px;list-style:none;padding:0;margin:0}
.footer-links li{margin:0}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:28px;font-size:14px;color:var(--text-muted)}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{color:var(--text);text-decoration:underline;text-underline-offset:4px}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:32px;padding-top:24px;border-top:1px solid var(--border)}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;margin-top:24px;font-size:13px;color:var(--text-muted)}
.footer-bottom p{margin:0}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px}

@media(max-width:1240px){
  .nav{gap:20px}
  .menu li+li::before{margin:0 9px}
}
@media(max-width:1100px){
  .menu{font-size:14px}
  .lang{padding-inline:8px}
  .nav{gap:16px}
}
@media(max-width:980px){
  .desktop-nav{display:none}
  .nav-end{margin-left:auto}
  .burger{display:inline-flex}
  .mobile-drawer:not([hidden]){display:block;position:absolute;top:100%;left:var(--gutter);right:var(--gutter);max-height:calc(100dvh - var(--nav-height) - 16px);overflow-y:auto;overscroll-behavior:contain;padding:12px;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--r-card);box-shadow:var(--shadow-paper);z-index:52}
  .mobile-drawer a{display:flex;align-items:center;justify-content:space-between;width:100%;min-height:44px;padding:10px 14px;border-radius:var(--r-chip);font-size:15px}
  .mobile-drawer a:hover,.mobile-drawer a[aria-current="page"]{background:var(--bg-panel-2)}
  .drawer-languages{border-top:1px solid var(--border);margin-top:12px;padding-top:12px}
  .grid-5{grid-template-columns:repeat(3,minmax(0,1fr))}
  .footer-grid{gap:28px}
}
@media(max-width:768px){
  h1{font-size:38px}
  .section{padding-top:56px;padding-bottom:56px}
  .grid-3{grid-template-columns:minmax(0,1fr)}
  .grid-5{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:minmax(0,1fr)}
  .footer-bottom{align-items:flex-start;flex-direction:column}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  h1{font-size:34px}
  .nav{gap:8px}
  .nav-end{margin-left:auto;gap:6px}
  .lang{padding-inline:6px}
  .lang-label{display:none}
  .login{padding-inline:14px}
  .brand{font-size:17px;gap:8px}
  .brand-zh{font-size:13px}
  .btn{min-height:50px;padding-inline:22px;font-size:15px}
  .panel,.card{padding:22px}
  .tilt,.note,[data-tilt]{transform:none}
  .decoration,.stripe-halo{max-width:100%}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}