:root {
  --bg:#F4F4F7;
  --panel:#FFFFFF;
  --panel-2:#EAEAF0;
  --border:#DCDCE5;
  --accent:#2357F5;
  --accent-dark:#163DC4;
  --accent-light:#5B83FF;
  --accent-soft:#E6ECFE;
  --accent-ring:rgba(35,87,245,.30);
  --orange:#F26A2E;
  --apricot:#F9C9AE;
  --mauve:#EBB8E8;
  --mauve-deep:#C67BD6;
  --mauve-ring:rgba(235,184,232,.55);
  --sky:#A9DDF3;
  --text:#12141F;
  --muted:#5A5E70;
  --success:#1E9D62;
  --warn:#D98510;
  --error:#D33B3B;
  --glass:rgba(255,255,255,.62);
  --outline-bg:rgba(255,255,255,.45);
  --hi-white:rgba(255,255,255,.85);
  --sheen:rgba(255,255,255,.42);
  --float-line:rgba(220,220,229,.85);
  --veil:rgba(18,20,31,.36);
  --clear:transparent;
  --win:#14161F;
  --win-side:#1C1F2B;
  --win-bar:#181B26;
  --win-raise:#232737;
  --win-raise-on:#1F2742;
  --win-node:#1A1D29;
  --win-line:rgba(255,255,255,.07);
  --win-line-2:rgba(255,255,255,.14);
  --win-dash:rgba(255,255,255,.18);
  --win-text:#ECEEF6;
  --win-text-2:#C3C7D6;
  --win-muted:#8A8FA6;
  --win-hi:rgba(35,87,245,.22);
  --win-glow:rgba(35,87,245,.16);
  --win-gleam:rgba(255,255,255,.18);
  --win-outline:rgba(10,12,20,.5);
  --status-a:rgba(35,87,245,.30);
  --status-b:rgba(35,87,245,.08);
  --status-line:rgba(91,131,255,.30);
  --success-glow:rgba(30,157,98,.22);
  --shadow-blue:rgba(35,87,245,.12);
  --shadow-blue-strong:rgba(35,87,245,.20);
  --shadow-apricot:rgba(232,120,70,.22);
  --shadow-ink:rgba(18,20,31,.06);
  --flag-red:#DE2B3A;
  --flag-white:#FFFFFF;
  --flag-navy:#273A8C;
  --flag-blue:#2450B5;
  --flag-green:#159152;
  --flag-ring:rgba(18,20,31,.14);
  --flag-ring-d:rgba(255,255,255,.14);
  --font-display:"Inter","Noto Sans SC","Noto Sans JP","Noto Sans KR","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","Noto Sans JP","Noto Sans KR","PingFang SC","Hiragino Sans","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-heavy:800;
  --weight-display:900;
  --r-sm:6px;
  --r-md:8px;
  --r-win:14px;
  --r-xl:24px;
  --r-pill:999px;
  --r-round:50%;
  --r-flag:3px;
  --r-tiny:2px;
  --gutter:24px;
  --wrap:1248px;
  --reading:800px;
  --header-height:64px;
  --anchor-offset:88px;
  --toc-offset:88px;
  --toc-landing:160px;
  --space-1:8px;
  --space-2:16px;
  --space-3:24px;
  --space-4:32px;
  --space-6:48px;
  --space-8:64px;
  --space-10:80px;
  --ease:ease;
  --speed:.2s;
  --shadow-panel:0 16px 40px -24px var(--shadow-blue);
}
*,*::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:16px;font-weight:var(--weight-normal);line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button:disabled{cursor:not-allowed}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
button,a,summary{-webkit-tap-highlight-color:var(--accent-ring)}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
[hidden]{display:none!important}
h1,h2,h3,h4{font-family:var(--font-display);color:var(--text);text-wrap:balance}
h1{margin:14px auto 10px;font-weight:var(--weight-display);font-size:clamp(52px,4.45vw,64px);line-height:1.1;letter-spacing:-.02em}
h2{margin:0 0 24px;font-size:clamp(28px,3.2vw,44px);line-height:1.2;font-weight:var(--weight-display);letter-spacing:-.02em}
h3{margin:0 0 16px;font-size:28px;line-height:1.25;font-weight:var(--weight-display);letter-spacing:-.015em}
h4{font-size:20px;font-weight:var(--weight-heavy)}
p{margin:0 0 16px}
strong{font-weight:var(--weight-bold)}
small{font-size:13px}
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{width:100%;max-width:var(--reading);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:var(--space-10);padding-bottom:var(--space-10)}
.section-tight{padding-top:var(--space-6);padding-bottom:var(--space-6)}
.grid{display:grid;gap:var(--space-3)}
.grid>*{min-width:0}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-5{grid-template-columns:repeat(5,minmax(0,1fr))}
.flex-row{display:flex;align-items:center;flex-wrap:wrap;gap:var(--space-2)}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono)}
.text-link{display:inline-flex;align-items:center;gap:8px;min-height:24px;color:var(--accent);font-weight:var(--weight-semibold)}
.text-link:hover{text-decoration:underline;text-underline-offset:4px}
.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}
.sr-defs{position:absolute;width:0;height:0;overflow:hidden}
.panel,.card{min-width:0;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-md);padding:var(--space-3);box-shadow:var(--shadow-panel)}
.panel-sunken{background:var(--panel-2)}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere}
p code,li code{background:var(--panel-2);border-radius:var(--r-sm);padding:2px 5px}
pre{max-width:100%;overflow-x:auto;padding:var(--space-3);border:1px solid var(--border);border-radius:var(--r-md);background:var(--panel-2);font-family:var(--font-mono);font-size:14px}
pre code{overflow-wrap:normal;white-space:pre}
.prose{min-width:0;overflow-wrap:break-word}
.prose p,.prose li{line-height:1.9}
.prose h2{margin-top:var(--space-8)}
.prose h3{margin-top:var(--space-6)}
.prose a:not(.btn){color:var(--accent);text-decoration:underline;text-underline-offset:3px}
.prose img{border-radius:var(--r-md)}
.prose ol,.prose ul{padding-left:24px}
.prose section[id]{scroll-margin-top:var(--anchor-offset)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:46px;padding:0 28px;border:1px solid var(--clear);border-radius:var(--r-sm);font-family:var(--font-body);font-size:16px;font-weight:var(--weight-bold);letter-spacing:.01em;line-height:1.35;white-space:nowrap;flex-shrink:0;transition:background var(--speed) var(--ease),transform var(--speed) var(--ease),box-shadow var(--speed) var(--ease)}
.btn-primary{background:var(--accent);color:var(--panel);box-shadow:0 10px 24px -10px var(--shadow-blue-strong)}
.btn-primary:hover,.btn-primary.is-hover{background:var(--accent-dark);transform:translateY(-1px)}
.btn-primary:active{transform:translateY(0);box-shadow:none}
.btn-outline,.btn-secondary{background:var(--outline-bg);color:var(--text);border:1.5px solid var(--text)}
.btn-outline:hover,.btn-secondary:hover,.btn-outline.is-hover{background:var(--panel)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.55;pointer-events:none;box-shadow:none;transform:none}
.btn-small{min-height:36px;padding-inline:16px;font-size:14px}
.cta-row{display:flex;justify-content:center;flex-wrap:wrap;gap:12px}
.icon-button{display:inline-flex;align-items:center;justify-content:center;min-width:44px;min-height:44px;border:0;border-radius:var(--r-sm);background:var(--panel-2);color:var(--text)}
.notice{background:var(--panel-2);border-bottom:1px solid var(--border);font-size:13.5px;color:var(--muted)}
.notice .wrap{min-height:36px;display:flex;align-items:center;gap:10px}
.notice-dot{width:10px;height:10px;border-radius:var(--r-round);flex-shrink:0;background:radial-gradient(circle,var(--mauve-deep) 0 36%,var(--mauve) 42%);box-shadow:0 0 0 3px var(--mauve-ring)}
.notice-text{min-width:0}
.notice-text strong{color:var(--text);font-weight:var(--weight-semibold)}
.notice-link{display:inline-flex;align-items:center;gap:6px;min-height:24px;color:var(--accent);font-weight:var(--weight-semibold);white-space:nowrap}
.notice-link span{text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}
.notice-link svg{transition:transform var(--speed) var(--ease)}
.notice-link:hover svg{transform:translateX(3px)}
#site-header{position:relative;z-index:100}
.topnav{position:relative;z-index:103;background:var(--panel);border-bottom:1px solid var(--border)}
.topnav .wrap{height:var(--header-height);display:flex;align-items:center;flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0;font-family:var(--font-display);font-weight:var(--weight-display);font-size:20px;letter-spacing:-.02em;color:var(--text)}
.brand img{width:32px;height:32px;flex-shrink:0}
.brand-zh{color:var(--muted);font-weight:var(--weight-medium)}
.desktop-nav{align-self:stretch;flex:1;min-width:0;margin-left:30px}
.tabs{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:2px;height:100%}
.tabs li{display:flex;height:100%;min-width:0}
.tab{position:relative;display:flex;align-items:center;padding:0 14px;min-height:44px;font-size:15px;font-weight:var(--weight-medium);color:var(--muted);white-space:nowrap;transition:color var(--speed) var(--ease)}
.tab::after{content:"";position:absolute;left:14px;right:14px;bottom:-1px;height:3px;border-radius:var(--r-flag) var(--r-flag) 0 0;background:var(--accent);transform:scaleX(0);transform-origin:center;transition:transform .25s var(--ease)}
.tab:hover{color:var(--text)}
.tab:hover::after{transform:scaleX(.35)}
.tab[aria-current="page"]{color:var(--text);font-weight:var(--weight-bold)}
.tab[aria-current="page"]::after{transform:scaleX(1)}
.nav-end{margin-left:auto;display:flex;align-items:center;gap:10px;flex-shrink:0}
.lang-box{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;height:36px;padding:0 10px;border:0;border-radius:var(--r-sm);background:var(--clear);font-size:14px;color:var(--muted);cursor:pointer}
.lang span{white-space:nowrap}
.lang:hover{background:var(--panel-2);color:var(--text)}
.lang-panel{position:absolute;top:calc(100% + 12px);right:0;z-index:110;min-width:180px;padding:8px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:0 16px 40px var(--shadow-blue)}
.lang-panel a{display:flex;align-items:center;width:100%;min-height:44px;padding:8px 12px;border-radius:var(--r-sm);font-size:14px}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--accent-soft);color:var(--accent)}
.login{display:inline-flex;align-items:center;justify-content:center;height:36px;min-width:60px;padding:0 18px;border-radius:var(--r-sm);background:var(--accent);color:var(--panel);font-size:14px;font-weight:var(--weight-bold);white-space:nowrap;transition:background var(--speed) var(--ease)}
.login:hover{background:var(--accent-dark)}
.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-sm);background:var(--clear);color:var(--text)}
.menu-line{display:block;width:20px;height:2px;background:currentColor;border-radius:var(--r-tiny)}
.menu-toggle[aria-expanded="true"]{background:var(--accent-soft);color:var(--accent)}
.mobile-drawer{display:none}
.nav-veil{display:none}
html.nav-open{overflow:hidden}
.site-footer{margin-top:var(--space-8);padding-top:var(--space-8);padding-bottom:var(--space-3);background:var(--panel-2);border-top:1px solid var(--border)}
.footer-grid{display:grid;grid-template-columns:1.25fr 1fr 1fr 1fr;gap:var(--space-6)}
.footer-grid>*{min-width:0}
.footer-brand p{max-width:300px;margin-top:16px;color:var(--muted);font-size:14px}
.footer-heading{margin:0 0 12px;font-size:15px;font-weight:var(--weight-heavy)}
.footer-links{list-style:none;padding:0;margin:0;display:grid;gap:4px}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;font-size:14px;color:var(--muted);overflow-wrap:anywhere}
.footer-links a:hover{color:var(--accent);text-decoration:underline;text-underline-offset:3px}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px;margin-top:var(--space-6);padding-top:var(--space-3);border-top:1px solid var(--border);color:var(--muted);font-size:13px}
.footer-legal{display:flex;flex-wrap:wrap;gap:8px 20px}
.footer-legal a{display:inline-flex;align-items:center;min-height:24px}
.footer-legal a:hover{color:var(--accent)}
.reveal{transition:opacity .35s var(--ease),transform .35s var(--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%;overflow:hidden;margin-top:var(--space-3);margin-bottom:var(--space-3)}
#server-status>*{min-width:0;max-width:100%}
#server-status+*{margin-top:var(--space-3)}
[data-count]{display:inline-block;min-width:3ch;font-variant-numeric:tabular-nums;font-family:var(--font-mono)}
@media(max-width:1100px){
  .desktop-nav{margin-left:16px}
  .tab{padding-inline:9px;font-size:14px}
  .tab::after{left:9px;right:9px}
  .nav-end{gap:6px}
}
@media(max-width:1000px){
  .desktop-nav{display:none}
  .nav-end{margin-left:auto}
  .menu-toggle{display:inline-flex}
  .mobile-drawer{display:block;position:fixed;top:var(--header-height);right:0;bottom:0;z-index:102;width:min(420px,100%);height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;padding:16px var(--gutter) 32px;background:var(--panel);border-left:1px solid var(--border)}
  .mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;border-radius:var(--r-sm);color:var(--text);font-weight:var(--weight-medium)}
  .mobile-drawer a:hover,.mobile-drawer a[aria-current]{background:var(--accent-soft);color:var(--accent)}
  .drawer-links{list-style:none;margin:0;padding:0}
  .drawer-languages{margin-top:16px;padding-top:16px;border-top:1px solid var(--border)}
  .nav-veil{display:block;position:fixed;inset:var(--header-height) 0 0;z-index:101;border:0;background:var(--veil);width:100%;height:calc(100dvh - var(--header-height))}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid-5{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media(max-width:768px){
  h1{font-size:38px;line-height:1.18}
  h2{font-size:30px}
  h3{font-size:24px}
  .grid-3{grid-template-columns:1fr}
  .section{padding-top:56px;padding-bottom:56px}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  h1{font-size:34px}
  .grid-2,.grid-5{grid-template-columns:1fr}
  .notice-text{font-size:12px}
  .notice .wrap{gap:8px;flex-wrap:wrap;padding-block:6px}
  .brand{font-size:18px;gap:7px}
  .brand img{width:28px;height:28px}
  .lang span{display:none}
  .lang{padding-inline:6px}
  .login{padding-inline:12px;min-width:52px}
  .nav-end{margin-left:auto;gap:2px}
  .btn{min-height:44px;padding-inline:20px;font-size:15px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:24px 16px}
  .footer-brand{grid-column:1/-1}
  .tilt{transform:none!important}
  .decorated{overflow-x:clip;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}
}