:root{
  --bg:#F5F7FC;--bg-top:#FAFBFE;--panel:#FFFFFF;--groove:#ECF0F8;--groove-soft:#F3F6FB;
  --line:#DCE2EE;--line-strong:#C6CFDF;--accent:#245EF0;--accent-dark:#1846BF;--sky:#4C8DFF;
  --sky-half:rgba(76,141,255,.55);--hl:#FFE07A;--hl-soft:rgba(255,224,122,.6);
  --text:#1C2433;--muted:#5A6475;--faint:#8A93A3;--success:#1F9D61;--warn:#C98A06;--error:#D2403A;
  --success-12:rgba(31,157,97,.12);--warn-22:rgba(201,138,6,.22);
  --accent-04:rgba(36,94,240,.04);--accent-06:rgba(36,94,240,.06);--accent-10:rgba(36,94,240,.10);
  --accent-14:rgba(36,94,240,.14);--accent-22:rgba(36,94,240,.22);--accent-30:rgba(36,94,240,.30);
  --sky-12:rgba(76,141,255,.12);--sky-18:rgba(76,141,255,.18);
  --ink-08:rgba(28,36,51,.08);--ink-12:rgba(28,36,51,.12);--veil:rgba(28,36,51,.3);
  --white-35:rgba(255,255,255,.35);--white-60:rgba(255,255,255,.6);--white-90:rgba(255,255,255,.9);
  --clear:transparent;
  --f-display:'Inter','Noto Sans SC','PingFang SC','Hiragino Sans','Apple SD Gothic Neo','Microsoft YaHei',system-ui,sans-serif;
  --f-body:'Inter','Noto Sans SC','PingFang SC','Hiragino Sans','Malgun Gothic','Microsoft YaHei',system-ui,sans-serif;
  --f-mono:'JetBrains Mono',ui-monospace,'SFMono-Regular',Menlo,Consolas,monospace;
  --r-win:10px;--r-card:8px;--r-sm:6px;--r-xs:4px;--r-row:5px;--r-note:3px;--r-pill:999px;--r-round:50%;--r-halo:28px;
  --r-marker:.12em .32em .18em .36em / .3em .16em .34em .2em;
  --r-question:10px 10px 10px 3px;--r-answer:10px 10px 3px 10px;
  --gutter:56px;--site-width:1440px;--header-height:68px;--anchor-space:88px;--toc-anchor:156px;
  --shadow-card:0 1px 0 var(--accent-04),0 6px 14px -10px var(--accent-14);
  --shadow-panel:inset 0 0 0 1px var(--white-90),0 1px 2px var(--accent-06),0 24px 56px -14px var(--accent-14),0 60px 120px -48px var(--accent-10);
  --shadow-button:inset 0 1px 0 var(--white-35),0 12px 26px -10px var(--accent-30),0 2px 6px var(--accent-14);
  --gradient-button:linear-gradient(135deg,var(--accent),var(--sky));
  --duration-fast:.15s;--duration-reveal:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-space);scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--f-body);font-size:15px;line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
[hidden]{display:none!important}
img,video{display:block;max-width:100%;height:auto}
svg{vertical-align:middle;flex-shrink:0}
button,input,select,textarea{font:inherit;color:inherit}
button,summary{cursor:pointer}
button{background:var(--panel)}
a{color:var(--accent);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);outline-offset:3px;border-radius:var(--r-xs)}
h1,h2,h3,h4{font-family:var(--f-display);color:var(--text);text-wrap:balance}
h1,.h1{margin:0 0 26px;font-size:clamp(52px,4.45vw,64px);line-height:1.1;font-weight:800;letter-spacing:-.02em}
h2{font-size:32px;line-height:1.25;letter-spacing:-.02em;font-weight:800;margin:0 0 24px}
h3{font-size:21px;line-height:1.4;margin:0 0 16px}
p{margin:0 0 20px}
ul,ol{padding-left:1.5em}
code{font-family:var(--f-mono);overflow-wrap:anywhere;background:var(--groove);border-radius:var(--r-xs);padding:.12em .3em;font-size:.9em}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--groove);border:1px solid var(--line);border-radius:var(--r-card)}
pre code{padding:0;white-space:pre;overflow-wrap:normal}
blockquote{margin-inline:0}
fieldset{min-width:0}
.wrap{width:100%;max-width:var(--site-width);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:72px;padding-bottom:72px}
.section-head{max-width:760px;margin-bottom:32px}
.section-head p,.muted{color:var(--muted)}
.num{font-family:var(--f-mono);font-weight:600;font-variant-numeric:tabular-nums;letter-spacing:-.01em}
.no-break{white-space:nowrap}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.panel,.card{min-width:0;background:var(--panel);border:1px solid var(--line);border-radius:var(--r-card);box-shadow:var(--shadow-card);padding:24px}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.grid>*{min-width:0}
.icon{width:24px;height:24px;flex-shrink:0}
.btn,.btn-main,.btn-ghost,.btn-login,.btn-pill{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  min-height:44px;padding:10px 20px;border:1px solid var(--line-strong);border-radius:var(--r-pill);
  background:var(--panel);color:var(--text);font-weight:600;text-decoration:none;line-height:1.4;
  flex-shrink:0;white-space:nowrap;transition:border-color var(--duration-fast),color var(--duration-fast),box-shadow var(--duration-fast);
}
.btn:hover,.btn-ghost:hover,.btn-login:hover{border-color:var(--accent);color:var(--accent-dark)}
.btn-main,.btn-primary{min-height:52px;padding:0 24px 0 28px;border:0;background:var(--gradient-button);color:var(--panel);font-size:16px;font-weight:700;box-shadow:var(--shadow-button)}
.btn-main:hover,.btn-primary:hover{color:var(--panel);box-shadow:inset 0 1px 0 var(--white-35),0 16px 32px -10px var(--accent-30),0 2px 6px var(--accent-22)}
.btn-main svg{width:18px;height:18px}
.btn-ghost{height:52px;padding-inline:24px;font-size:16px}
.btn-login{min-height:36px;height:36px;padding:0 16px;border-radius:var(--r-card);font-size:14px}
.btn-pill{min-height:36px;height:36px;padding:0 18px;background:var(--accent);border:0;color:var(--panel);font-size:14px;font-weight:700;box-shadow:inset 0 1px 0 var(--white-35),0 6px 16px -6px var(--accent-30)}
.btn-pill:hover{background:var(--accent-dark);color:var(--panel)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.55;cursor:not-allowed;box-shadow:none}
.cta-row{display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin-bottom:26px}
.topbar,#site-header{position:relative;z-index:100}
.topbar-in{display:flex;align-items:center;flex-wrap:nowrap;gap:32px;min-height:var(--header-height)}
.brand{display:inline-flex;align-items:center;gap:10px;color:var(--text);text-decoration:none;flex-shrink:0;min-height:32px}
.brand-mark{width:32px;height:32px;filter:drop-shadow(0 4px 8px var(--accent-22))}
.brand-word{font-family:var(--f-display);font-size:19px;font-weight:800;letter-spacing:-.025em;line-height:1}
.brand-word span{color:var(--accent)}
.mainnav{flex:1;min-width:0}
.mainnav ul{display:flex;align-items:center;justify-content:center;list-style:none;margin:0;padding:0;gap:24px}
.mainnav li{flex-shrink:0}
.mainnav a{display:inline-block;min-height:28px;padding:6px 0;font-size:14.5px;font-weight:500;color:var(--muted);text-decoration:none;white-space:nowrap}
.mainnav a:hover{color:var(--text)}
.mainnav a[aria-current="page"]{color:var(--text);font-weight:700}
.tools{display:flex;align-items:center;gap:10px;flex-shrink:0;position:relative;z-index:104}
.language{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;min-height:36px;min-width:44px;width:auto;font:inherit;font-size:13.5px;color:var(--muted);background:var(--clear);border:0;padding:6px 8px;border-radius:var(--r-sm);white-space:nowrap}
.lang:hover{background:var(--groove);color:var(--text)}
.language-panel{position:absolute;right:0;top:calc(100% + 8px);z-index:120;min-width:160px;padding:8px;background:var(--panel);border:1px solid var(--line);border-radius:var(--r-card);box-shadow:0 12px 30px var(--accent-14)}
.language-panel a{display:flex;align-items:center;min-height:40px;padding:8px 12px;color:var(--text);text-decoration:none;border-radius:var(--r-xs);white-space:nowrap}
.language-panel a:hover,.language-panel a[aria-current="true"]{background:var(--groove);color:var(--accent-dark)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;border:1px solid var(--line);border-radius:var(--r-sm);background:var(--panel);color:var(--text)}
.menu-line{display:block;width:20px;height:2px;background:currentColor}
.mobile-drawer{display:none;position:fixed;z-index:102;top:var(--header-height);right:0;left:0;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;padding:20px var(--gutter) 40px;background:var(--panel);border-top:1px solid var(--line)}
.mobile-drawer ul{list-style:none;padding:0;margin:0}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:10px 12px;color:var(--text);text-decoration:none;border-radius:var(--r-sm)}
.mobile-drawer a:hover,.mobile-drawer a[aria-current="page"]{background:var(--accent-06);color:var(--accent-dark)}
.drawer-languages{border-top:1px solid var(--line);margin-top:20px;padding-top:16px}
.menu-veil{display:none;position:fixed;z-index:101;inset:var(--header-height) 0 0;background:var(--veil);border:0}
html.nav-open{overflow:hidden}
.site-footer{border-top:1px solid var(--line);background:linear-gradient(180deg,var(--groove-soft),var(--groove));padding-top:48px;padding-bottom:28px}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:48px}
.footer-brand{min-width:0}
.footer-brand p{max-width:360px;margin-top:20px;color:var(--muted);font-size:14px}
.footer-title{font-size:14px;margin:0 0 14px;font-weight:700}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 20px;list-style:none;padding:0;margin:0}
.footer-links a{display:inline-flex;align-items:center;min-height:30px;font-size:13px;color:var(--muted);text-decoration:none}
.footer-links a:hover{color:var(--accent-dark);text-decoration:underline}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 24px;margin-top:32px;padding-top:24px;border-top:1px solid var(--line)}
.footer-languages a{display:inline-flex;align-items:center;min-height:28px;color:var(--muted);font-size:13px}
.footer-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px 24px;margin-top:24px;color:var(--muted);font-size:12px}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px}
.footer-legal a{min-height:24px;color:var(--muted)}
.reveal{transition:opacity var(--duration-reveal) ease,transform var(--duration-reveal) ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:static;display:flow-root;min-width:0;max-width:100%;overflow:hidden;margin-top:24px;margin-bottom:24px}
#server-status+*{margin-top:24px}
body:has(.toc-tabs) section[id]{scroll-margin-top:var(--toc-anchor)}
.prose{min-width:0;max-width:820px;overflow-wrap:break-word}
.prose p,.prose li{line-height:1.9}
.prose h2{margin-top:48px}
.prose h3{margin-top:28px}
.decorated,.stage{overflow-x:clip;max-width:100%}
@media(min-width:1101px) and (max-width:1430px){
  .topbar-in{gap:18px}.mainnav ul{gap:14px}.mainnav a{font-size:13px}.tools{gap:6px}
}
@media(max-width:1100px){
  :root{--gutter:32px}
  .mainnav{display:none}
  .tools{margin-left:auto}
  .topbar-in{gap:12px}
  .menu-toggle{display:inline-flex}
  html.nav-open .mobile-drawer{display:block}
  html.nav-open .menu-veil{display:block}
  .footer-grid{gap:24px}
}
@media(max-width:768px){
  h1,.h1{font-size:40px;line-height:1.12}
  h2{font-size:28px}
  .section{padding-top:48px;padding-bottom:48px}
  .grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
  .tools .btn-pill{display:none}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1/-1}
}
@media(max-width:640px){
  :root{--gutter:20px}
  .no-break{white-space:normal}
  .tilt,.sticky{transform:none}
  .decorated,.stage{max-width:100%;overflow-x:clip}
  .brand{gap:6px}.brand-mark{width:26px;height:26px}.brand-word{font-size:16px}
  .topbar-in{gap:6px}.tools{gap:4px;margin-left:auto}
  .btn-login{padding-inline:10px;font-size:13px}
  .lang{padding-inline:5px;font-size:12px}
  .grid{grid-template-columns:1fr}
  .panel,.card{padding:20px}
  .footer-grid{grid-template-columns:1fr}
  .footer-brand{grid-column:auto}
}
@media(max-width:360px){
  :root{--gutter:16px}
  .brand-word{font-size:14px}.brand-mark{width:24px;height:24px}
  .tools{gap:2px}.topbar-in{gap:4px}
  .btn-login{padding-inline:8px}.lang{font-size:11px;padding-inline:4px}
  h1,.h1{font-size:36px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none;transition:none}
  *,*::before,*::after{animation-duration:.001ms!important;animation-delay:0ms!important;transition-duration:.001ms!important}
}