:root {
  color-scheme: light;
  --bg:#F9FAFB;
  --panel:#FFFFFF;
  --panel-2:#EEF4FA;
  --border:#DEE5EC;
  --accent:#1D5FAE;
  --accent-dark:#163F73;
  --sky:#1D9BE0;
  --honey:#F7DE8C;
  --text:#17212E;
  --text-muted:#5A6778;
  --text-sub:#40597A;
  --success:#2E9B63;
  --warn:#D99A12;
  --error:#D2453B;
  --white:#FFFFFF;
  --wire:#B5C6D8;
  --tint-accent:#E4EDF8;
  --tint-sky:#E1F1FB;
  --tint-honey:#FCF1CC;
  --ring-1:#FBF4E4;
  --ring-2:#F8EDD6;
  --ring-3:#F5E6C9;
  --ring-4:#F2E0BB;
  --ring-5:#EFD9AE;
  --ring-6:#ECD4A3;
  --ring-7:#EAD09A;
  --bark-1:#8B5B37;
  --bark-2:#5C3920;
  --bark-3:#A9744A;
  --ring-line:color-mix(in srgb,var(--bark-1) 20%,var(--ring-3));
  --flag-red:#C9473F;
  --flag-blue:#2F4B8A;
  --font-display:'Inter','Noto Sans SC','PingFang SC','Hiragino Sans','Yu Gothic','Apple SD Gothic Neo','Malgun Gothic','Microsoft YaHei',system-ui,sans-serif;
  --font-body:'Inter','Noto Sans SC','PingFang SC','Hiragino Sans','Yu Gothic','Apple SD Gothic Neo','Malgun Gothic','Microsoft YaHei',system-ui,sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,'SFMono-Regular',Menlo,Consolas,monospace;
  --weight-normal:400;
  --weight-medium:500;
  --weight-semibold:600;
  --weight-bold:700;
  --weight-display:800;
  --text-xs:12px;
  --text-sm:14px;
  --text-base:16px;
  --text-lead:20px;
  --text-h1:clamp(52px,5vw,68px);
  --text-h2:clamp(28px,3vw,40px);
  --text-h3:24px;
  --r-xs:10px;
  --r-sm:12px;
  --r-md:16px;
  --r-lg:22px;
  --r-bar:24px;
  --r-pill:999px;
  --r-circle:50%;
  --gutter:24px;
  --page-width:1200px;
  --reading-width:820px;
  --header-height:68px;
  --anchor-offset:84px;
  --toc-offset:92px;
  --space-section:72px;
  --ease:cubic-bezier(.2,.65,.3,1);
  --time-fast:.2s;
  --time-reveal:.35s;
  --hl:inset 0 1px 0 color-mix(in srgb,var(--white) 92%,transparent);
  --shadow-soft:0 18px 44px -18px color-mix(in srgb,var(--accent) 26%,transparent),0 4px 12px -6px color-mix(in srgb,var(--accent) 10%,transparent);
  --shadow-card:0 20px 48px -20px color-mix(in srgb,var(--accent) 16%,transparent),var(--hl);
  --shadow-raised:0 24px 52px -18px color-mix(in srgb,var(--accent) 23%,transparent),var(--hl);
  --cta-gradient:linear-gradient(115deg,var(--sky) 0%,var(--accent) 78%);
  --focus-color:color-mix(in srgb,var(--sky) 70%,var(--accent));
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:var(--text-base);line-height:1.6;-webkit-font-smoothing:antialiased}
[hidden]{display:none!important}
img,svg,video{vertical-align:middle;max-width:100%}
img{height:auto}
button,input,select,textarea{font:inherit}
button,a,input,summary{-webkit-tap-highlight-color:transparent}
button{cursor:pointer;color:inherit}
a{color:var(--accent);text-underline-offset:.2em}
a:hover{color:var(--accent-dark)}
button:disabled,.btn[aria-disabled="true"]{cursor:not-allowed;opacity:.55}
:focus-visible{outline:3px solid var(--focus-color);outline-offset:3px}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:var(--weight-display);color:var(--text);text-wrap:balance}
h1{font-size:var(--text-h1);line-height:1.12;letter-spacing:-.02em;margin:0 0 24px}
h2{font-size:var(--text-h2);line-height:1.2;letter-spacing:-.02em;margin:0 0 24px}
h3{font-size:var(--text-h3);line-height:1.3;margin:0 0 16px}
p{margin:0 0 20px}
ul,ol{padding-inline-start:24px}
li+li{margin-top:6px}
hr{border:0;border-top:1px solid var(--border);margin-block:32px}
code,kbd,pre{font-family:var(--font-mono);font-size:.9em}
code{overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--panel-2);border:1px solid var(--border);border-radius:var(--r-sm);white-space:pre}
pre code{overflow-wrap:normal}
table{border-collapse:collapse}
th,td{text-align:start}
summary{cursor:pointer}
.no-break{white-space:nowrap}
.wrap{max-width:var(--page-width);margin-inline:auto;padding-inline:var(--gutter);width:100%;min-width:0}
.reading-wrap{max-width:var(--reading-width);margin-inline:auto;padding-inline:var(--gutter);min-width:0}
.section{padding-top:var(--space-section);padding-bottom:var(--space-section)}
.section-heading{max-width:780px;margin-bottom:32px}
.section-heading p{color:var(--text-muted);font-size:18px}
.centered{text-align:center}
.muted{color:var(--text-muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.grid{display:grid;gap:24px}
.grid>*{min-width:0}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-five{grid-template-columns:repeat(5,minmax(0,1fr))}
.stack>*+*{margin-top:24px}
.panel,.card{background:var(--panel);border-radius:var(--r-lg);box-shadow:var(--shadow-card);border:1px solid color-mix(in srgb,var(--border) 65%,var(--white));min-width:0}
.panel{padding:32px}
.card{padding:28px}
.panel-secondary{background:var(--panel-2)}
.decor-region{position:relative;overflow-x:clip;max-width:100%}
.prose{min-width:0;overflow-wrap:break-word}
.prose h2{margin-top:48px}
.prose h3{margin-top:32px}
.prose p,.prose li{line-height:1.85}
.prose img{border-radius:var(--r-sm)}
.prose a{overflow-wrap:anywhere}
.skip{position:absolute;left:12px;top:-60px;z-index:100;padding:8px 14px;border-radius:var(--r-pill);background:var(--white);color:var(--accent-dark);font-weight:var(--weight-bold);text-decoration:none;box-shadow:var(--shadow-soft)}
.skip:focus{top:12px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:52px;padding:12px 32px;border-radius:var(--r-pill);font-size:var(--text-base);font-weight:var(--weight-bold);line-height:1.4;text-decoration:none;letter-spacing:.01em;border:1.5px solid transparent;transition:transform var(--time-fast) var(--ease),box-shadow var(--time-fast) var(--ease),background-color var(--time-fast) var(--ease);flex-shrink:0;white-space:nowrap}
.btn svg{width:18px;height:18px;flex-shrink:0}
.btn-primary{color:var(--white);background:var(--cta-gradient);box-shadow:0 14px 30px -12px color-mix(in srgb,var(--accent) 70%,transparent),inset 0 1px 0 color-mix(in srgb,var(--white) 32%,transparent)}
.btn-primary:hover{color:var(--white);transform:translateY(-2px);box-shadow:0 18px 34px -12px color-mix(in srgb,var(--accent) 78%,transparent),var(--hl)}
.btn-ghost,.btn-secondary{color:var(--accent);background:color-mix(in srgb,var(--white) 70%,transparent);border-color:var(--accent)}
.btn-ghost:hover,.btn-secondary:hover{background:var(--white);transform:translateY(-2px)}
.btn-small{min-height:42px;padding:9px 20px;font-size:var(--text-sm)}
.btn:active{transform:translateY(0)}
.btn-demo-hover{transform:translateY(-2px);box-shadow:var(--shadow-raised)}
.btn-demo-focus{outline:3px solid var(--focus-color);outline-offset:3px}
.cta-row{display:flex;justify-content:center;gap:14px;margin-top:24px;flex-wrap:wrap}
.reveal{transition:opacity var(--time-reveal) ease,transform var(--time-reveal) ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-height:120px;min-width:0;max-width:100%;overflow:hidden;margin-top:24px;margin-bottom:32px}
#server-status>*{min-width:0;max-width:100%}
#server-status+*{margin-top:32px}

/* The top bar never establishes a containing block for the fixed drawer. */
#site-header{position:relative;z-index:50}
.site-header{position:relative;z-index:3;background:color-mix(in srgb,var(--white) 94%,var(--bg));border-bottom:1px solid color-mix(in srgb,var(--border) 75%,transparent)}
.head-row{height:var(--header-height);display:flex;align-items:center;gap:24px;flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:var(--text);font-family:var(--font-display);font-weight:var(--weight-display);font-size:20px;letter-spacing:-.02em;flex-shrink:0;white-space:nowrap;min-height:44px}
.brand:hover{color:var(--text)}
.brand-mark{width:34px;height:34px;border-radius:var(--r-xs);flex-shrink:0}
.site-nav{margin-left:auto;flex:1;min-width:0;display:flex;justify-content:flex-end}
.nav-list{display:flex;align-items:center;gap:2px;list-style:none;margin:0;padding:0}
.nav-list>li{margin:0}
.nav-link,.nav-more-btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:40px;padding:8px 14px;border-radius:var(--r-pill);font:inherit;font-size:15px;font-weight:var(--weight-medium);color:var(--text);text-decoration:none;background:none;border:0;cursor:pointer;white-space:nowrap;transition:background-color var(--time-fast) ease,color var(--time-fast) ease}
.nav-link:hover,.nav-more-btn:hover{background:var(--panel-2);color:var(--text)}
.nav-link[aria-current="page"],.nav-more-btn.is-current{color:var(--accent);font-weight:var(--weight-bold);background:color-mix(in srgb,var(--accent) 7%,transparent)}
.nav-more{position:relative}
.nav-more-btn svg{width:12px;height:12px;color:var(--text-muted);flex-shrink:0}
.nav-drop{position:absolute;top:calc(100% + 10px);left:-6px;min-width:236px;margin:0;padding:8px;list-style:none;background:var(--white);border-radius:var(--r-md);box-shadow:var(--shadow-soft),inset 0 0 0 1px var(--border);z-index:8}
.nav-drop li{margin:0}
.nav-drop a{display:block;min-height:44px;padding:9px 12px;border-radius:var(--r-sm);text-decoration:none}
.nav-drop a:hover,.nav-drop a[aria-current="page"]{background:var(--panel-2)}
.drop-name{display:block;font-size:14.5px;font-weight:var(--weight-bold);color:var(--text);line-height:1.3}
.drop-desc{display:block;font-size:12.5px;color:var(--text-muted);line-height:1.4;margin-top:2px}
.nav-disclosure{position:relative}
.nav-disclosure>summary{list-style:none}
.nav-disclosure>summary::-webkit-details-marker{display:none}
.head-tools{display:flex;align-items:center;gap:8px;margin-left:12px;flex-shrink:0}
.lang-control{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:40px;width:auto;padding:8px 12px;border:0;background:none;border-radius:var(--r-pill);font:inherit;font-size:var(--text-sm);color:var(--text-muted);cursor:pointer;white-space:nowrap}
.lang span{white-space:nowrap}
.lang:hover{background:var(--panel-2)}
.lang svg{width:16px;height:16px;flex-shrink:0}
.lang-panel{position:absolute;right:0;top:calc(100% + 10px);min-width:176px;padding:8px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:var(--shadow-soft);z-index:12}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-sm);text-decoration:none;color:var(--text)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--panel-2);color:var(--accent)}
.login{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:8px 22px;border-radius:var(--r-pill);border:1.5px solid var(--border);background:var(--white);color:var(--accent-dark);font-size:14.5px;font-weight:var(--weight-bold);line-height:1.4;text-decoration:none;white-space:nowrap;box-shadow:0 4px 12px -8px color-mix(in srgb,var(--accent) 35%,transparent)}
.login:hover{border-color:var(--accent);color:var(--accent)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;border:1px solid var(--border);border-radius:var(--r-sm);background:var(--panel);color:var(--accent-dark)}
.menu-toggle svg{width:22px;height:22px;flex-shrink:0}
.mobile-drawer{position:fixed;inset-inline:0;top:var(--header-height);height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));padding:20px var(--gutter) 32px;background:var(--panel);overflow-y:auto;overscroll-behavior:contain;z-index:2;border-top:1px solid var(--border)}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:48px;padding:12px 16px;color:var(--text);text-decoration:none;border-radius:var(--r-sm)}
.mobile-drawer a:hover,.mobile-drawer a[aria-current="page"]{background:var(--panel-2);color:var(--accent)}
.drawer-list{list-style:none;margin:0;padding:0}
.drawer-list li{margin:0}
.drawer-languages{border-top:1px solid var(--border);margin-top:16px;padding-top:16px}
.drawer-label{margin:8px 16px;font-size:var(--text-sm);color:var(--text-muted);font-weight:var(--weight-bold)}
.nav-veil{position:fixed;inset:var(--header-height) 0 0;background:color-mix(in srgb,var(--accent-dark) 18%,transparent);z-index:1;border:0}
html.nav-open{overflow:hidden}

.site-footer{padding-top:56px;padding-bottom:28px;background:var(--panel-2);border-top:1px solid var(--border)}
.footer-grid{display:grid;grid-template-columns:1.35fr 1fr 1fr;gap:48px}
.footer-grid>*{min-width:0}
.footer-brand p{max-width:360px;margin-top:16px;color:var(--text-muted);font-size:var(--text-sm)}
.footer-title{font-size:var(--text-base);margin:6px 0 16px;font-weight:var(--weight-bold)}
.footer-links{list-style:none;margin:0;padding:0;display:grid;gap:4px}
.footer-links li{margin:0}
.footer-links a{display:inline-flex;align-items:center;min-height:32px;color:var(--text-sub);text-decoration:none;font-size:var(--text-sm)}
.footer-links a:hover{text-decoration:underline;color:var(--accent)}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;border-top:1px solid var(--border);margin-top:32px;padding-top:24px}
.footer-languages a{display:inline-flex;align-items:center;min-height:32px;font-size:var(--text-sm);text-decoration:none;color:var(--text-sub)}
.footer-languages a[aria-current="true"]{font-weight:var(--weight-bold);color:var(--accent)}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:12px;margin-top:20px;color:var(--text-muted);font-size:var(--text-xs)}
.footer-bottom p{margin:0}
.footer-legal{display:flex;flex-wrap:wrap;gap:16px}
.footer-legal a{display:inline-flex;align-items:center;min-height:28px;color:var(--text-sub);text-decoration:none}
@media(min-width:1440px){
  :root{--text-h1:68px}
}
@media(max-width:1100px){
  .head-row{gap:14px}
  .nav-link,.nav-more-btn{padding-inline:10px;font-size:var(--text-sm)}
  .head-tools{margin-left:0;gap:4px}
  .lang{padding-inline:8px}
}
@media(max-width:960px){
  .site-nav{display:none}
  .head-tools{margin-left:auto}
  .menu-toggle{display:inline-flex}
  .grid-five{grid-template-columns:repeat(3,minmax(0,1fr))}
  .footer-grid{gap:28px;grid-template-columns:1.2fr 1fr 1fr}
}
@media(min-width:961px){
  .mobile-drawer,.nav-veil{display:none!important}
  html.nav-open{overflow:auto}
}
@media(max-width:768px){
  :root{--text-h1:clamp(28px,7vw,40px);--space-section:48px}
  .grid-three{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1/-1}
  .panel{padding:24px}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .head-row{gap:8px}
  .brand{font-size:17px;gap:7px}
  .brand-mark{width:30px;height:30px}
  .head-tools{margin-left:auto;gap:4px}
  .lang{font-size:var(--text-xs);padding-inline:6px;min-height:40px}
  .lang svg{display:none}
  .login{padding-inline:13px;font-size:var(--text-sm)}
  .menu-toggle{min-width:44px}
  .card{padding:22px}
  .grid-five{grid-template-columns:1fr}
  .tilt,.tilt-decor{transform:none}
  .decor-region{max-width:100%;overflow-x:clip}
  .btn{padding-inline:24px}
  .footer-grid{gap:24px}
  .footer-bottom{align-items:flex-start;flex-direction:column}
}
@media(max-width:359px){
  .brand{font-size:15px;gap:5px}
  .brand-mark{width:26px;height:26px}
  .login{padding-inline:10px}
  .lang{font-size:11px;padding-inline:4px}
  .head-tools{gap:2px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none}
}