:root{
  --bg:#E8EAF9;--bg-wash-top:#EEF0FC;--bg-wash-bottom:#E1E5F6;
  --wash-violet:rgba(98,54,245,.05);--wash-magenta:rgba(224,64,158,.05);
  --panel:#F8F9FE;--panel-2:#DCE0F4;--panel-veil:rgba(248,249,254,.74);
  --border:#CBD0EA;--border-soft:#DADEF1;
  --accent:#6236F5;--accent-dark:#4521C8;--accent-2:#E0409E;
  --accent-tint:rgba(98,54,245,.20);--accent-ring:rgba(98,54,245,.16);
  --text:#15173B;--text-hover:#262A5E;--muted:#5B6084;--faint:#8A8FB2;
  --success:#0E9A6C;--warn:#B8720A;--error:#D23A4F;
  --ink:#1C1F45;--ink-3:#2B2F66;--ink-hi:rgba(236,237,251,.16);
  --ink-edge:rgba(236,237,251,.12);--ink-chip:rgba(236,237,251,.05);
  --on-ink:#ECEDFB;--on-ink-muted:#A0A5CE;
  --lavender:#C4B8FF;--lavender-soft:rgba(196,184,255,.16);
  --lavender-line:rgba(196,184,255,.38);--lavender-fill:rgba(196,184,255,.55);
  --lavender-fill-2:rgba(196,184,255,.22);--lavender-wash:rgba(196,184,255,.30);
  --white:#FFFFFF;--hi:rgba(255,255,255,.92);
  --shadow-10:rgba(98,54,245,.10);--shadow-12:rgba(98,54,245,.12);
  --shadow-18:rgba(98,54,245,.18);--shadow-ink:rgba(21,23,59,.18);
  --flag-red:#D52B3A;--flag-blue:#1F3A8C;--flag-white:#FFFFFF;
  --flag-edge:rgba(21,23,59,.16);
  --grad:linear-gradient(100deg,var(--accent) 0%,var(--accent-2) 100%);
  --font-display:"Inter","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Malgun Gothic","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --r-xs:4px;--r-sm:6px;--r-md:8px;--r-card:12px;--r-win:14px;--r-pill:999px;
  --gutter:64px;--toc-offset:126px
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:84px;-webkit-text-size-adjust:100%}
html.nav-open{overflow:hidden}
body{margin:0;background:var(--bg);color:var(--text);font:15px/1.6 var(--font-body);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:inherit}
a,button,summary,select,[role="tab"]{touch-action:manipulation}
a:focus-visible,button:focus-visible,summary:focus-visible,select:focus-visible,[role="tab"]:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--r-sm)}
button,select{font:inherit}
img,svg{max-width:100%}
img{height:auto}
p{margin:0}
h1,h2,h3{font-family:var(--font-display);line-height:1.2;text-wrap:balance}
h1{font-size:clamp(52px,4.8vw,72px)}
h2{font-size:clamp(26px,3vw,38px)}
h3{font-size:21px}
code,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch}
.no-break{white-space:nowrap}
.shell,.wrap{width:100%;max-width:1440px;margin-inline:auto;padding-inline:var(--gutter);min-width:0}
.wrap{max-width:1200px}
:is(.shell,.wrap)>*,.hero-grid>*,.card-grid>*,.footer-grid>*{min-width:0}
.sec{padding-top:80px;padding-bottom:80px}
.panel,.card{background:var(--panel);border:1px solid var(--border-soft);border-radius:var(--r-card);box-shadow:inset 0 1px 0 var(--white),0 18px 44px -22px var(--shadow-12)}
.reveal{transition:opacity .55s ease,transform .55s ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
.btn-solid,.btn-outline,.btn-login{display:inline-flex;align-items:center;justify-content:center;min-height:46px;padding:0 24px;border-radius:var(--r-sm);font-size:15px;font-weight:700;text-decoration:none;white-space:nowrap;flex-shrink:0;cursor:pointer}
.btn-solid{border:1px solid var(--text);background:var(--text);color:var(--panel)}
.btn-solid:hover{background:var(--text-hover)}
.btn-outline,.btn-login{border:1px solid var(--text);background:transparent;color:var(--text)}
.btn-outline:hover,.btn-login:hover{background:var(--text);color:var(--panel)}
.link-u{text-decoration:underline;text-underline-offset:6px;text-decoration-thickness:1px;font-weight:600}
.link-u:hover{color:var(--accent-dark)}
.badge{display:inline-flex;align-items:center;gap:8px;max-width:100%;min-height:28px;padding:3px 12px 3px 10px;border:1px solid var(--border);border-radius:var(--r-pill);background:var(--panel-veil);box-shadow:inset 0 1px 0 var(--white);font-size:12.5px;font-weight:600;color:var(--muted);overflow-wrap:anywhere}
.badge i{width:7px;height:7px;flex:none;border-radius:50%;background:var(--text);box-shadow:0 0 0 3px var(--accent-ring)}
.kh-top{background:linear-gradient(115deg,var(--wash-violet),var(--wash-magenta)),linear-gradient(180deg,var(--bg-wash-top),var(--bg-wash-bottom));overflow-x:clip;max-width:100%}
.site-top{position:relative;z-index:30}
.nav-row{display:flex;align-items:center;height:68px;gap:28px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;flex:none}
.brand img{width:30px;height:30px;flex:none}
.brand-en{font-family:var(--font-display);font-weight:800;font-size:19px;letter-spacing:-.02em}
.brand-zh{font-size:13px;font-weight:500;color:var(--muted);padding-left:10px;border-left:1px solid var(--border)}
.nav-main{margin-left:auto}
.nav-main ul{display:flex;align-items:center;list-style:none;margin:0;padding:0}
.nav-main li{display:flex;align-items:center}
.nav-main li+li::before{content:"·";color:var(--faint);padding:0 11px;font-weight:700}
.nav-main a{text-decoration:none;font-size:14px;font-weight:500;color:var(--muted);padding:6px 0}
.nav-main a:hover,.nav-main a[aria-current="page"]{color:var(--text)}
.nav-main a[aria-current="page"]{font-weight:700}
.nav-tools{display:flex;align-items:center;gap:14px;padding-left:22px;border-left:1px solid var(--border);flex:none}
.lang-button{border:0;background:none;padding:6px 2px;min-height:36px;color:var(--text);font-size:13.5px;font-weight:500;cursor:pointer;white-space:nowrap}
.lang-button span{color:var(--faint);padding-left:2px}
.lang-holder{position:relative}
.lang-menu{position:absolute;right:0;top:100%;width:max-content;min-width:140px;padding:6px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--panel);box-shadow:0 16px 34px var(--shadow-12)}
.lang-menu[hidden],.nav-drawer[hidden],.nav-veil[hidden]{display:none!important}
.lang-menu a{display:flex;align-items:center;min-height:38px;padding:5px 10px;border-radius:var(--r-sm);text-decoration:none;font-size:13px}
.lang-menu a:hover,.lang-menu a[aria-current]{background:var(--panel-2)}
.btn-login{min-height:36px;padding:0 16px;font-size:14px;font-weight:600}
.nav-toggle{display:none;min-width:44px;min-height:44px;align-items:center;justify-content:center;border:1px solid var(--border);border-radius:var(--r-sm);background:var(--panel);color:var(--text);cursor:pointer}
.nav-toggle svg{width:20px;height:20px}
.nav-drawer{display:none}
.nav-veil{display:none}
.site-footer{padding-top:64px;background:var(--ink);color:var(--on-ink)}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1.35fr 1fr;gap:36px}
.footer-brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:19px;text-decoration:none}
.footer-brand img{width:30px;height:30px}
.footer-description{margin-top:16px;color:var(--on-ink-muted);max-width:290px}
.footer-title{margin:0 0 15px;font-size:13px;color:var(--on-ink);font-weight:700}
.footer-links{display:flex;flex-wrap:wrap;gap:5px 16px}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;color:var(--on-ink-muted);font-size:13px;text-decoration:none}
.footer-links a:hover{color:var(--on-ink);text-decoration:underline}
.footer-links-column{flex-direction:column;align-items:flex-start}
.footer-bottom{margin-top:52px;padding-top:18px;padding-bottom:22px;border-top:1px solid var(--ink-edge);font-size:12px;color:var(--on-ink-muted)}
#server-status{position:relative;display:block;max-width:100%;overflow:hidden;margin-bottom:32px}
#server-status+*{margin-top:24px}
body:has(.toc-tabs) section[id]{scroll-margin-top:var(--toc-offset)}
@media(max-width:1180px){.nav-main li+li::before{padding:0 7px}.nav-main a{font-size:13px}.brand-zh{display:none}}
@media(max-width:1024px){
  :root{--gutter:40px}
  .nav-main{display:none}
  .nav-tools{margin-left:auto}
  .nav-toggle{display:inline-flex}
  .nav-drawer{position:absolute;display:block;top:68px;left:0;right:0;max-height:calc(100dvh - 68px);overflow-y:auto;overscroll-behavior:contain;background:var(--panel);border-top:1px solid var(--border);box-shadow:0 20px 40px var(--shadow-12);padding:10px var(--gutter) 20px;z-index:32}
  .nav-drawer a{display:flex;width:100%;align-items:center;min-height:44px;padding:10px 12px;text-decoration:none;border-bottom:1px solid var(--border-soft)}
  .nav-drawer a[aria-current]{color:var(--accent-dark);font-weight:700}
  .drawer-label{margin:14px 12px 3px;font-size:12px;color:var(--muted)}
  .nav-veil{position:fixed;display:block;inset:68px 0 0;background:var(--shadow-ink);z-index:20}
}
@media(max-width:768px){
  :root{--gutter:20px}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  h1{font-size:clamp(28px,9vw,40px);line-height:1.12;letter-spacing:-.02em}
  .sec{padding-top:56px;padding-bottom:56px}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .brand-en{font-size:17px}
  .nav-row{gap:9px}
  .nav-tools{gap:7px;padding-left:9px}
  .lang-button{font-size:12px}
  .btn-login{padding-inline:10px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:28px 16px}
  .tilt,[class*="tilt-"]{transform:none!important}
}
@media(max-width:380px){.lang-button{font-size:11px}.nav-tools{gap:4px}.brand img{width:26px;height:26px}}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending{opacity:1;transform:none;transition:none}
  *,*::before,*::after{animation-duration:0s!important;transition-duration:0s!important}
}