:root{
  color-scheme:light;
  --bg:#F8F1E4;--bg-panel:#FFFBF4;--bg-panel-2:#F0E6D3;
  --border:#E3D6BF;--border-soft:#EDE3D1;--border-strong:#CDBDA3;
  --accent:#2532E0;--accent-dark:#1A22A8;--accent-tint:#E2E5FB;
  --text:#2A2118;--text-soft:#4A3D2F;--text-muted:#6E6152;--ink-hover:#3B3025;
  --success:#2E8A57;--success-tint:#DCEFE3;--warn:#C9801A;--warn-tint:#F6E6CB;--error:#C93A2E;
  --apricot:#F2A774;--apricot-hi:#F8C29C;--apricot-deep:#D98A57;
  --hero-top:#FBF6EC;--hero-bottom:#F1E7D6;--hero-fade-0:rgba(241,231,214,0);--side:#F7EFE1;
  --on-accent:#FFFFFF;--on-accent-soft:rgba(255,255,255,.84);--on-accent-dim:rgba(255,255,255,.42);--on-accent-line:rgba(255,255,255,.3);
  --glow-apricot:rgba(242,167,116,.42);--glow-blue:rgba(37,50,224,.13);
  --hl:rgba(255,255,255,.72);--hl-edge:rgba(255,255,255,.45);--sheen:rgba(255,255,255,.6);
  --shadow-ink:rgba(26,20,14,.34);--shadow-ink-soft:rgba(42,33,24,.08);--shadow-accent:rgba(37,50,224,.16);
  --shadow-win:0 56px 110px -30px rgba(37,50,224,.10),0 24px 52px -20px rgba(37,50,224,.10);
  --shadow-panel:inset 0 1px 0 var(--hl),0 18px 48px -28px var(--shadow-accent);
  --knob-inset:rgba(26,20,14,.18);--dot-edge:rgba(26,20,14,.14);
  --flag-red:#D52B1E;--flag-blue:#22357A;--flag-white:#FFFFFF;--flag-edge:rgba(42,33,24,.16);
  --mask:#000000;--clear:transparent;--veil:rgba(42,33,24,.34);
  --font-display:Georgia,"Times New Roman","Songti SC","STSong","SimSun","Hiragino Mincho ProN","Nanum Myeongjo",serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Microsoft YaHei","Hiragino Sans","Apple SD Gothic Neo","Malgun Gothic",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --fs-xs:12px;--fs-sm:14px;--fs-body:16px;--fs-lede:18px;--fs-brand:20px;
  --fs-h1:clamp(52px,5.4vw,68px);--fs-h2:clamp(28px,3.2vw,40px);--fs-h3:24px;
  --r-face:5px;--r-tile:6px;--r-sm:8px;--r-md:10px;--r-lg:12px;--r-bubble:16px;--r-pill:999px;--r-circle:50%;
  --gutter:24px;--section-gap:80px;--header-height:77px;--anchor-offset:96px;--toc-offset:88px;
  --ease:cubic-bezier(.2,.7,.3,1);--duration:.35s;
  --grain-paper:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='g'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 .18 -.05'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23g)'/%3E%3C/svg%3E");
  --grain-band:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='g'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 .72 -.22'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23g)'/%3E%3C/svg%3E");
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:var(--anchor-offset)}
html.nav-open{overflow:hidden}
body{margin:0;background:var(--grain-paper),var(--bg);color:var(--text);font-family:var(--font-body);font-size:var(--fs-body);line-height:1.6;-webkit-font-smoothing:antialiased}
img,svg{vertical-align:middle}
img{max-width:100%;height:auto}
svg{flex-shrink:0}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline;text-underline-offset:4px}
button,a,summary{touch-action:manipulation}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:4px}
.topband :focus-visible{outline-color:var(--on-accent)}
button:disabled,[aria-disabled="true"]{cursor:not-allowed;opacity:.55}
[hidden]{display:none!important}
h1,h2,h3{font-family:var(--font-display);line-height:1.2;font-weight:700;text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--fs-h1);line-height:1.1;letter-spacing:-.02em;margin:0 0 24px}
h2{font-size:var(--fs-h2);margin:0 0 24px}
h3{font-size:var(--fs-h3);margin:0 0 16px}
p{margin:0 0 20px}
small{font-size:var(--fs-xs)}
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-sm)}
pre code{overflow-wrap:normal;white-space:pre}
blockquote{margin:24px 0}
ul,ol{padding-left:24px}
li{margin-block:4px}
hr{border:0;border-top:1px solid var(--border);margin-block:32px}
.wrap{width:100%;max-width:1248px;margin-inline:auto;padding-inline:var(--gutter)}
.shell{width:100%;max-width:1248px;margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:var(--section-gap);padding-bottom:var(--section-gap)}
.reading-wrap{max-width:848px}
.prose{overflow-wrap:break-word}
.prose h2{margin-top:56px}
.prose h3{margin-top:32px}
.prose li{margin-block:10px}
.prose a{text-decoration:underline;text-underline-offset:3px}
.prose img{border-radius:var(--r-sm)}
.no-break{white-space:nowrap}
.muted{color:var(--text-muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.accent{color:var(--accent)}
.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}
.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))}
.panel,.card{padding:28px;border:1px solid var(--border);border-radius:var(--r-lg);background:var(--bg-panel);box-shadow:var(--shadow-panel);min-width:0}
.decorated-section{position:relative;overflow-x:clip}
.btn,.btn-primary,.btn-secondary,.btn-main,.btn-ghost{display:inline-flex;align-items:center;justify-content:center;min-height:44px;gap:10px;border-radius:var(--r-lg);border:1px solid var(--clear);font-weight:600;white-space:nowrap;flex-shrink:0;text-decoration:none}
.btn,.btn-primary{padding:11px 20px;background:var(--text);color:var(--bg-panel);box-shadow:inset 0 1px 0 var(--hl-edge),0 10px 24px -14px var(--shadow-ink)}
.btn:hover,.btn-primary:hover{background:var(--ink-hover);text-decoration:none}
.btn-secondary{padding:11px 20px;background:var(--bg-panel);border-color:var(--border-strong);color:var(--text)}
.btn-secondary:hover{border-color:var(--text-muted);text-decoration:none}
.btn-main{gap:14px;height:56px;padding:0 22px 0 8px;background:var(--text);color:var(--bg-panel);font-size:17px;letter-spacing:.02em;box-shadow:inset 0 1px 0 var(--hl-edge),0 14px 28px -12px var(--shadow-ink)}
.btn-main:hover{background:var(--ink-hover);text-decoration:none}
.btn-ico{display:grid;place-items:center;width:40px;height:40px;border-radius:var(--r-sm);background:var(--bg-panel);box-shadow:inset 0 0 0 1px var(--border);flex-shrink:0}
.btn-ico img,.btn-ico svg{width:24px;height:24px}
.btn-arrow{width:18px;height:18px;opacity:.8}
.btn-ghost{height:56px;padding:0 28px;border-color:var(--border-strong);background:var(--bg-panel);color:var(--text);box-shadow:inset 0 1px 0 var(--hl)}
.btn-ghost:hover{border-color:var(--text-muted);text-decoration:none}
.cta-row{margin-top:24px;display:flex;flex-wrap:wrap;justify-content:center;gap:16px}
#site-header{position:relative;z-index:50}
.topband{position:relative;z-index:53;padding-bottom:7px;color:var(--on-accent)}
.topband::before{content:"";position:absolute;inset:0;z-index:-1;background:var(--grain-band),var(--accent);-webkit-mask:linear-gradient(var(--mask) 0 0) top/100% calc(100% - 6px) no-repeat,radial-gradient(circle at 7px 0,var(--mask) 6.6px,var(--clear) 7.2px) bottom left/14px 7px repeat-x;mask:linear-gradient(var(--mask) 0 0) top/100% calc(100% - 6px) no-repeat,radial-gradient(circle at 7px 0,var(--mask) 6.6px,var(--clear) 7.2px) bottom left/14px 7px repeat-x}
.topband-row{height:70px;display:flex;align-items:center;gap:36px}
.brand{display:inline-flex;align-items:center;gap:10px;font-size:var(--fs-brand);font-weight:700;letter-spacing:.01em;color:inherit;flex:none;white-space:nowrap}
.brand:hover{text-decoration:none}
.brand img{width:28px;height:28px;display:block}
.brand-zh{font-weight:400;color:var(--on-accent-soft)}
.mainnav{flex:1;min-width:0}
.mainnav ul{display:flex;align-items:center;list-style:none;margin:0;padding:0;white-space:nowrap}
.mainnav li{display:flex;align-items:center;font-size:15px;margin:0}
.mainnav li+li::before{content:"·";margin:0 12px;color:var(--on-accent-dim);font-weight:700}
.mainnav a{padding:6px 0;color:var(--on-accent-soft);border-bottom:2px solid var(--clear)}
.mainnav a:hover{color:var(--on-accent);text-decoration:none}
.mainnav a[aria-current="page"]{color:var(--on-accent);font-weight:600;border-bottom-color:var(--on-accent)}
.band-tools{display:flex;align-items:center;gap:12px;flex-shrink:0}
.language{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:36px;width:auto;padding:0 12px;border-radius:var(--r-sm);border:1px solid var(--on-accent-line);background:var(--clear);color:var(--on-accent-soft);font-size:var(--fs-sm);white-space:nowrap}
.lang span{white-space:nowrap}
.lang svg{width:16px;height:16px;display:block}
.lang-panel{position:absolute;top:calc(100% + 12px);right:0;z-index:60;min-width:180px;padding:8px;background:var(--bg-panel);color:var(--text);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:var(--shadow-panel)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;color:var(--text);border-radius:var(--r-sm)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--accent-tint);color:var(--accent-dark);text-decoration:none}
.login{display:inline-flex;align-items:center;justify-content:center;min-height:36px;padding:0 20px;border-radius:var(--r-sm);background:var(--bg-panel);color:var(--accent-dark);font-size:var(--fs-sm);font-weight:700;white-space:nowrap;box-shadow:inset 0 1px 0 var(--hl),0 6px 16px -6px var(--shadow-ink)}
.login:hover{background:var(--on-accent);text-decoration:none}
.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(--on-accent-line);border-radius:var(--r-sm);background:var(--clear);color:var(--on-accent)}
.menu-line{display:block;width:20px;height:2px;background:currentColor;flex-shrink:0}
.menu-toggle[aria-expanded="true"]{background:var(--accent-dark)}
.nav-drawer{display:none;position:fixed;top:var(--header-height);inset-inline:0;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;background:var(--bg-panel);z-index:52;padding:16px var(--gutter) 32px}
.nav-drawer.is-open{display:block}
.nav-drawer ul{list-style:none;margin:0;padding:0}
.nav-drawer li{margin:0}
.nav-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;color:var(--text);border-bottom:1px solid var(--border-soft)}
.nav-drawer a[aria-current]{color:var(--accent);font-weight:600}
.drawer-languages{margin-top:24px;border-top:1px solid var(--border)}
.nav-veil{position:fixed;inset:var(--header-height) 0 0;z-index:51;background:var(--veil)}
.site-footer{padding-top:56px;padding-bottom:32px;border-top:1px solid var(--border);background:var(--grain-paper),var(--bg-panel-2)}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:48px}
.footer-grid>*{min-width:0}
.footer-brand .brand{color:var(--text)}
.footer-brand p{margin-top:20px;max-width:30em;color:var(--text-muted)}
.footer-heading{font-family:var(--font-body);font-size:var(--fs-body);margin-bottom:16px}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 16px;list-style:none;padding:0;margin:0}
.footer-links li{margin:0}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;color:var(--text-soft)}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:32px}
.footer-languages a{display:inline-flex;align-items:center;min-height:28px}
.footer-bottom{display:flex;flex-wrap:wrap;gap:12px 24px;justify-content:space-between;border-top:1px solid var(--border-strong);margin-top:24px;padding-top:24px;font-size:var(--fs-sm);color:var(--text-muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px}
.footer-legal a{min-height:24px;color:var(--text-soft)}
.reveal{transition:opacity var(--duration) var(--ease),transform var(--duration) var(--ease)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:static;display:grid;grid-template-columns:minmax(0,1fr);min-height:120px;max-width:100%;overflow:hidden;margin-top:24px;margin-bottom:32px}
#server-status>*{min-width:0;max-width:100%}
#server-status+*{margin-top:32px}
@media(min-width:1041px) and (max-width:1279px){
  .topband-row{gap:20px}
  .mainnav li{font-size:var(--fs-sm)}
  .mainnav li+li::before{margin-inline:8px}
  .band-tools{gap:8px}
  .lang{padding-inline:8px}
}
@media(max-width:1040px){
  :root{--header-height:79px}
  .topband-row{height:72px;gap:16px;flex-wrap:nowrap}
  .mainnav{display:none}
  .band-tools{margin-left:auto}
  .menu-toggle{display:flex}
  .grid-five{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media(max-width:768px){
  :root{--section-gap:48px;--fs-h1:34px;--fs-h2:28px}
  h1{line-height:1.18}
  .grid-three,.grid-five,.footer-grid{grid-template-columns:minmax(0,1fr)}
  .footer-grid{gap:32px}
  .btn-main,.btn-ghost{height:52px}
  .panel,.card{padding:24px}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .decorative-tilt,.tilt-decoration{transform:none}
  .decorated-section{max-width:100%}
  .lang span{display:none}
  .lang{min-width:36px;padding-inline:8px}
  .topband-row{gap:8px}
  .band-tools{gap:6px;margin-left:auto}
  .brand{font-size:var(--fs-body);gap:7px}
  .brand img{width:24px;height:24px}
  .login{padding-inline:12px}
  .footer-links{gap:8px}
  pre{padding:16px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}