:root{
  color-scheme:light;
  --bg:#F4F6F8;
  --bg-top:#FAFBFC;
  --bg-panel:#FFFFFF;
  --bg-panel-2:#EAEEF2;
  --border:#DCE1E7;
  --accent:#FF9A1F;
  --accent-dark:#A35400;
  --accent-hi:#FFB347;
  --accent-deep:#FF8A00;
  --accent-soft:#FFD27A;
  --cream:#FFF5E6;
  --flare:#FFFFFF;
  --text:#12161C;
  --text-muted:#5A6472;
  --text-faint:#8C95A2;
  --success:#1F9D61;
  --warn:#B86E00;
  --error:#D2392B;
  --flag-red:#D0283C;
  --flag-navy:#1D2F6B;
  --flag-white:#FFFFFF;
  --clear:transparent;
  --accent-a04:rgba(255,154,31,.04);
  --accent-a10:rgba(255,154,31,.10);
  --accent-a14:rgba(255,154,31,.14);
  --accent-a22:rgba(255,154,31,.22);
  --accent-a30:rgba(255,154,31,.30);
  --accent-a40:rgba(255,154,31,.40);
  --accent-a55:rgba(255,154,31,.55);
  --accent-dark-a28:rgba(163,84,0,.28);
  --white-a55:rgba(255,255,255,.55);
  --white-a70:rgba(255,255,255,.70);
  --white-a90:rgba(255,255,255,.90);
  --ink-a06:rgba(18,22,28,.06);
  --ink-a10:rgba(18,22,28,.10);
  --ink-a40:rgba(18,22,28,.40);
  --ink-a72:rgba(18,22,28,.72);
  --success-a18:rgba(31,157,97,.18);
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Apple SD Gothic Neo","Microsoft YaHei","Malgun Gothic",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Apple SD Gothic Neo","Microsoft YaHei","Malgun Gothic",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --r-pill:999px;
  --r-card:16px;
  --r-mark:9px;
  --r-small:8px;
  --r-circle:50%;
  --page-width:1248px;
  --reading-width:800px;
  --gutter:24px;
  --section-space:96px;
  --toc-offset:16px;
  --anchor-space:96px;
  --header-edge:110px;
  --shadow-float:inset 0 1px 0 var(--white-a90),0 18px 40px -16px var(--accent-a30),0 2px 6px var(--ink-a06);
  --shadow-panel:inset 0 1px 0 var(--flare),0 24px 64px -28px var(--accent-a14);
  --ease-out:cubic-bezier(.2,.7,.25,1);
}
*,*::before,*::after{box-sizing:border-box;margin:0}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-space);scroll-behavior:smooth}
body{background:var(--bg);color:var(--text);font:400 16px/1.75 var(--font-body);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
html.nav-open{overflow:hidden}
[hidden]{display:none!important}
img{display:block;max-width:100%;height:auto}
svg{vertical-align:middle;flex-shrink:0}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
a{color:inherit;text-underline-offset:4px}
a:hover{color:var(--accent-dark)}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--accent-dark);outline-offset:3px}
button:disabled,.btn[aria-disabled="true"]{opacity:.5;cursor:not-allowed;transform:none}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:700;line-height:1.3;text-wrap:balance;overflow-wrap:break-word}
h1{font-size:clamp(52px,5vw,72px);letter-spacing:-.02em;line-height:1.1}
h2{font-size:clamp(28px,3vw,40px);letter-spacing:-.02em}
h3{font-size:22px}
p,li{overflow-wrap:break-word}
ul,ol{padding-left:1.5em}
code,kbd,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere;font-size:.9em}
pre{max-width:100%;overflow-x:auto;padding:24px;background:var(--bg-panel-2);border:1px solid var(--border);border-radius:var(--r-small);line-height:1.65}
pre code{overflow-wrap:normal;white-space:pre}
hr{border:0;border-top:1px solid var(--border);margin-block:32px}
::selection{background:var(--accent-a30);color:var(--text)}
.no-break{white-space:nowrap}
.wrap{width:100%;max-width:var(--page-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(--section-space);padding-bottom:var(--section-space)}
.section-head{max-width:760px;margin-bottom:40px}
.section-head p{margin-top:16px;color:var(--text-muted)}
.stack>*+*{margin-top:24px}
.grid{display:grid;gap:24px}
.grid>*{min-width:0}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
.muted{color:var(--text-muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.kicker{font:600 12px/1.5 var(--font-mono);letter-spacing:.12em;color:var(--accent-dark);margin-bottom:12px}
.panel{padding:32px;border:1px solid var(--border);border-radius:var(--r-card);background:var(--bg-panel);box-shadow:var(--shadow-panel)}
.prose{min-width:0;overflow-wrap:break-word}
.prose>*+*{margin-top:20px}
.prose h2{margin-top:56px}
.prose h3{margin-top:32px}
.prose li+li{margin-top:8px}
.prose a{color:var(--accent-dark)}
.prose blockquote{padding:20px 24px;border-left:3px solid var(--accent);background:var(--accent-a04)}
.shell{position:relative;overflow-x:clip;max-width:100%;background:linear-gradient(180deg,var(--bg-top) 0%,var(--bg) 48%,var(--bg-panel-2) 100%)}
.decorated-section{position:relative;overflow-x:clip;max-width:100%}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.grain{position:fixed;inset:0;width:100%;height:100%;pointer-events:none;z-index:60;opacity:.035;mix-blend-mode:multiply}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:48px;padding:0 26px;border:1px solid var(--clear);border-radius:var(--r-pill);font:600 15px/1 var(--font-body);text-decoration:none;color:var(--text);transition:transform .2s ease,box-shadow .2s ease;flex-shrink:0;white-space:nowrap}
.btn:hover{transform:translateY(-1px);color:var(--text)}
.btn svg{width:16px;height:16px}
.btn-primary{background:linear-gradient(180deg,var(--accent-hi),var(--accent));box-shadow:inset 0 1px 0 var(--white-a55),inset 0 -1px 0 var(--accent-dark-a28),0 12px 28px -12px var(--accent-a55)}
.btn-primary:hover,.btn-primary.is-hover{box-shadow:inset 0 1px 0 var(--white-a55),inset 0 -1px 0 var(--accent-dark-a28),0 16px 32px -12px var(--accent-a55)}
.btn-ghost,.btn-secondary{background:var(--bg-panel);border:1px solid var(--text);box-shadow:0 8px 20px -14px var(--ink-a10)}
.btn-small{height:40px;padding-inline:20px;font-size:14px}
.btn.is-focus{outline:2px solid var(--accent-dark);outline-offset:3px}
.notice{position:relative;z-index:6;background:var(--accent);color:var(--text)}
.notice-inner{max-width:1200px;margin:0 auto;padding:10px 24px;display:flex;justify-content:center;align-items:center;gap:12px;font-size:13.5px;line-height:20px;font-weight:500}
.notice strong{font-weight:700}
.notice-sep{opacity:.55}
.notice a{display:inline-flex;align-items:center;gap:5px;min-height:24px;font-weight:600;text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}
.notice a svg{width:14px;height:14px}
#site-header{position:relative;z-index:30;background:var(--bg-top)}
.masthead{position:relative;z-index:35;padding:14px 24px 0}
.navbar{position:relative;max-width:1200px;height:56px;margin:0 auto;padding:0 9px 0 12px;display:flex;align-items:center;gap:24px;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--r-pill);box-shadow:inset 0 1px 0 var(--flare),inset 0 -1px 0 var(--ink-a06),0 14px 36px -18px var(--accent-a40),0 1px 2px var(--ink-a06)}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:var(--text);flex-shrink:0}
.brand-mark{width:32px;height:32px;border-radius:var(--r-mark);flex-shrink:0}
.brand-word{font:700 18px/1 var(--font-display);letter-spacing:-.02em;white-space:nowrap}
.brand-zh{font-weight:500;color:var(--text-muted)}
.nav-links{list-style:none;margin:0;padding:0;display:flex;align-items:center;justify-content:center;gap:12px;flex:1;min-width:0;flex-wrap:nowrap}
.nav-links li{display:flex;align-items:center;flex-shrink:0}
.nav-more{position:relative}
.more-toggle{padding:6px 8px;border:0;background:var(--clear);font:inherit;font-size:14px;line-height:20px;color:var(--text-muted);cursor:pointer;white-space:nowrap}
.more-toggle:hover{color:var(--text)}
.nav-more-panel{position:absolute;z-index:44;top:calc(100% + 12px);right:0;min-width:240px;max-width:calc(100vw - 48px);margin:0;padding:8px;list-style:none;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--r-card);box-shadow:var(--shadow-float)}
.nav-more-panel li{display:block}
.nav-more-panel a{display:flex;width:100%;min-height:44px;padding:8px 12px;border-radius:var(--r-small)}
.nav-more-panel a:hover{background:var(--accent-a10)}
.nav-links a{position:relative;display:inline-flex;align-items:center;min-height:32px;padding:6px 1px;font-size:14px;line-height:20px;color:var(--text-muted);text-decoration:none;white-space:nowrap;transition:color .2s ease}
.nav-links a:hover{color:var(--text)}
.nav-links a[aria-current="page"]{color:var(--text);font-weight:600}
.nav-links a[aria-current="page"]::after{content:"";position:absolute;left:50%;bottom:-3px;width:4px;height:4px;margin-left:-2px;border-radius:var(--r-circle);background:var(--accent)}
.nav-end{display:flex;align-items:center;gap:6px;flex-shrink:0;margin-left:auto;flex-wrap:nowrap}
.lang-wrap{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;height:36px;min-width:44px;width:auto;padding:0 12px;border:0;border-radius:var(--r-pill);background:var(--clear);font:500 13.5px/1 var(--font-body);color:var(--text-muted);cursor:pointer;transition:background .2s ease}
.lang:hover{background:var(--bg)}
.lang svg{width:15px;height:15px}
.lang-text{white-space:nowrap}
.lang-caret{font-size:11px;opacity:.8}
.lang-panel{position:absolute;z-index:45;right:0;top:calc(100% + 12px);width:184px;padding:8px;list-style:none;background:var(--bg-panel);border:1px solid var(--border);border-radius:var(--r-card);box-shadow:var(--shadow-float)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-small);text-decoration:none;font-size:14px}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--accent-a10);color:var(--text)}
.login{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:38px;padding:0 6px 0 16px;border-radius:var(--r-pill);background:var(--text);color:var(--bg-panel);font:600 14px/1 var(--font-body);text-decoration:none;white-space:nowrap;transition:transform .2s ease;flex-shrink:0}
.login:hover{transform:translateY(-1px);color:var(--bg-panel)}
.login-arrow{width:26px;height:26px;border-radius:var(--r-circle);display:grid;place-items:center;background:var(--accent);color:var(--text)}
.login-arrow svg{width:12px;height:12px}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;padding:10px;border:0;border-radius:var(--r-circle);background:var(--clear);color:var(--text)}
.menu-line{display:block;width:20px;height:2px;background:currentColor}
.menu-toggle[aria-expanded="true"]{background:var(--accent-a14)}
.menu-veil{position:fixed;z-index:31;inset:var(--header-edge) 0 0;background:var(--ink-a40);border:0;width:100%}
.mobile-drawer{position:fixed;z-index:32;top:var(--header-edge);left:0;right:0;height:calc(100dvh - var(--header-edge));max-height:calc(100dvh - var(--header-edge));padding:16px var(--gutter) 40px;background:var(--bg-panel);overflow-y:auto;overscroll-behavior:contain;border-top:1px solid var(--border)}
.mobile-drawer ul{list-style:none;margin:0;padding:0}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:46px;padding:10px 12px;text-decoration:none;color:var(--text)}
.mobile-drawer a:hover,.mobile-drawer a[aria-current]{background:var(--accent-a10);border-radius:var(--r-small)}
.drawer-languages{margin-top:20px;padding-top:16px;border-top:1px solid var(--border)}
.site-footer{border-top:1px solid var(--border);background:var(--bg-panel-2);padding-top:64px;padding-bottom:32px}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:48px}
.footer-grid>*{min-width:0}
.footer-brand p{max-width:320px;margin-top:20px;font-size:14px;color:var(--text-muted)}
.footer-heading{font-size:15px;line-height:1.5;margin-bottom:16px}
.footer-links{list-style:none;padding:0;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:32px;font-size:13px;text-decoration:none}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 24px;margin-top:40px;padding-top:24px;border-top:1px solid var(--border)}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-top:24px;font:400 12px/1.6 var(--font-mono);color:var(--text-muted)}
.footer-legal{display:flex;gap:20px}
.reveal{transition:opacity .35s var(--ease-out),transform .35s var(--ease-out)}
.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%;overflow:hidden;margin-top:24px;margin-bottom:32px}
#server-status+*{margin-top:32px}
@media(max-width:1180px){
  .navbar{gap:16px}
  .nav-links{gap:8px}
  .nav-links a{font-size:13.5px}
}
@media(max-width:1100px){
  .nav-links{display:none}
  .menu-toggle{display:flex}
  .nav-end{margin-left:auto}
}
@media(min-width:1101px){
  .mobile-drawer,.menu-veil{display:none!important}
}
@media(max-width:768px){
  :root{--section-space:64px;--gutter:20px}
  h1{font-size:clamp(28px,6vw,40px)}
  .notice-inner{flex-wrap:wrap;gap:2px 10px;padding:8px 16px;font-size:12.5px}
  .masthead{padding:10px 12px 0}
  .navbar{height:52px;padding:0 7px 0 10px;gap:8px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .footer-brand{grid-column:1/-1}
  .grid-three{grid-template-columns:1fr}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .tilt,[data-tilt]{transform:none}
  .decorated-section{max-width:100%}
  .brand-word{font-size:16px}
  .panel{padding:24px}
  .lang{padding-inline:8px}
  .lang-text{display:none}
  .footer-grid{grid-template-columns:1fr}
  .footer-brand{grid-column:auto}
}
@media(max-width:360px){
  .brand{gap:6px}
  .brand-mark{width:28px;height:28px}
  .brand-word{font-size:14px}
  .nav-end{gap:2px}
  .login{padding-left:12px;gap:5px;font-size:13px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}