:root{
  color-scheme:light;
  --bg:#FAF0E1;
  --hero-top:#FDF6EA;
  --hero-bottom:#F4E6D2;
  --panel:#FFFAF2;
  --panel-2:#F1E3CF;
  --border:#E3D3BD;
  --border-deep:#D5C0A4;
  --accent:#7F2B22;
  --accent-dark:#5A1D17;
  --text:#2A1D17;
  --muted:#6E5B4E;
  --success:#3D7A4F;
  --warn:#B4761C;
  --error:#C8312A;
  --apricot:#F4DCC7;
  --apricot-deep:#E8BFA0;
  --apricot-line:#E0B48E;
  --sand:#ECCFA6;
  --taupe:#B9A28C;
  --taupe-deep:#8B7362;
  --on-accent:#FFFAF2;
  --highlight:rgba(255,255,255,.85);
  --highlight-soft:rgba(255,255,255,.18);
  --sheen:rgba(255,250,242,.38);
  --shadow-tint:rgba(127,43,34,.10);
  --shadow-tint-soft:rgba(127,43,34,.06);
  --accent-wash:rgba(127,43,34,.07);
  --accent-line:rgba(127,43,34,.26);
  --success-wash:rgba(61,122,79,.10);
  --glow:rgba(232,178,134,.30);
  --flag-red:#C8312A;
  --flag-white:#FFFDF8;
  --flag-blue:#2F3F68;
  --flag-black:#2A1D17;
  --flag-gold:#D9A21E;
  --clear:transparent;
  --font-display:Georgia,"Songti SC","STSong","Source Han Serif SC","Noto Serif CJK SC","SimSun",serif;
  --font-body:Inter,"Noto Sans SC",-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --r-s:8px;
  --r-m:12px;
  --r-pill:999px;
  --r-round:50%;
  --r-detail:6px;
  --r-tag:10px;
  --r-scene:6px;
  --r-frame:3px;
  --r-mini:38px;
  --r-mini-inner:34px;
  --r-mini-frame:29px;
  --shadow-panel:0 1px 0 var(--highlight) inset,0 22px 40px var(--shadow-tint),0 2px 6px var(--shadow-tint-soft);
  --shadow-float:0 1px 0 var(--highlight) inset,0 12px 26px var(--shadow-tint-soft);
  --gutter:24px;
  --wrap:1200px;
  --header-height:72px;
  --anchor-offset:88px;
  --toc-offset:156px;
  --ease: .2s ease;
  --paper-grain:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='180' height='180'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0.17 0 0 0 0 0.11 0 0 0 0 0.09 0 0 0 .55 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
}
*,*::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(--bg);color:var(--text);font-family:var(--font-body);font-size:17px;line-height:1.6;-webkit-font-smoothing:antialiased}
body::before{content:"";position:fixed;inset:0;z-index:20;pointer-events:none;opacity:.12;mix-blend-mode:multiply;background-image:var(--paper-grain)}
a{color:inherit;text-underline-offset:.2em}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button:disabled{cursor:not-allowed}
img{max-width:100%;height:auto}
svg{flex-shrink:0}
button svg,a svg{width:20px;height:20px}
[hidden]{display:none!important}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
::selection{background:var(--apricot);color:var(--text)}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:400;line-height:1.2;text-wrap:balance;overflow-wrap:break-word}
h1{font-size:clamp(52px,4.7vw,68px);letter-spacing:-.02em}
h2{font-size:clamp(30px,3.2vw,44px);letter-spacing:-.02em}
h3{font-size:27px}
p{margin:0 0 1.25em}
ul,ol{padding-left:1.4em}
li+li{margin-top:.3em}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;border:1px solid var(--border);border-radius:var(--r-s);background:var(--panel-2)}
pre code{overflow-wrap:normal;white-space:pre}
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{width:100%;max-width:840px;margin-inline:auto;padding-inline:var(--gutter)}
.sec{padding-top:88px;padding-bottom:88px}
.grid{display:grid;gap:24px}
.grid>*{min-width:0}
.grid--three{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--two{grid-template-columns:repeat(2,minmax(0,1fr))}
.no-break{white-space:nowrap}
.num{font-family:var(--font-mono);font-size:.92em;letter-spacing:-.01em;font-variant-numeric:tabular-nums}
.muted{color:var(--muted)}
.eyebrow{font-family:var(--font-mono);font-size:13px;letter-spacing:.06em;color:var(--muted)}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.panel,.card{padding:28px;border:1px solid var(--border);border-radius:var(--r-m);background:var(--panel);box-shadow:var(--shadow-float)}
.card h3{margin-top:0}
.decorated{position:relative;isolation:isolate;overflow-x:clip}
.reveal{transition:opacity .6s ease,transform .6s 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-block:24px}
#server-status+*{margin-top:24px}
#server-status .grid{min-width:0}

.btn,.btn-primary,.btn-secondary{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:52px;padding:12px 30px;border:1.5px solid var(--clear);border-radius:var(--r-pill);font-family:var(--font-body);font-size:16px;font-weight:500;line-height:1.4;text-decoration:none;white-space:nowrap;flex-shrink:0;transition:background-color var(--ease),color var(--ease),box-shadow var(--ease),transform var(--ease)}
.btn svg{width:16px;height:16px}
.btn--ghost,.btn-secondary{border-color:var(--text);color:var(--text);background:var(--clear)}
.btn--ghost:hover,.btn-secondary:hover{background:var(--panel)}
.btn--solid,.btn-primary{color:var(--on-accent);background:linear-gradient(160deg,var(--accent) 0%,var(--accent) 55%,var(--accent-dark) 100%);box-shadow:0 1px 0 var(--highlight-soft) inset,0 14px 28px var(--shadow-tint)}
.btn--solid:hover,.btn-primary:hover{background:var(--accent-dark);transform:translateY(-1px)}
.btn:active,.btn-primary:active{transform:translateY(0)}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--panel-2);border-color:var(--border);color:var(--muted);box-shadow:none;transform:none}
.btn--small{min-height:44px;padding:10px 20px;font-size:14px}

.site-head{position:relative;z-index:40;height:var(--header-height);background:var(--panel);border-bottom:1px solid var(--border)}
.site-head__inner{max-width:1440px;height:100%;margin:0 auto;padding:0 48px;display:flex;align-items:center}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:var(--text);flex:none}
.brand img{width:34px;height:34px;display:block}
.brand__word{font-family:var(--font-display);font-size:22px;letter-spacing:.02em;line-height:1}
.brand__zh{font-size:15px;color:var(--muted);font-weight:400}
.nav{margin-left:56px}
.nav ul{display:flex;align-items:center;gap:26px;list-style:none;margin:0;padding:0}
.nav li{margin:0}
.nav a{display:block;padding:6px 0;font-size:15px;color:var(--muted);text-decoration:none;white-space:nowrap;transition:color var(--ease)}
.nav a:hover,.nav a[aria-current="page"]{color:var(--text)}
.nav a[aria-current="page"]{font-weight:600}
.head-tools{margin-left:auto;display:flex;align-items:center;gap:20px;flex:none}
.lang-picker{position:relative}
.lang{appearance:none;border:0;background:var(--clear);padding:6px 2px;min-width:44px;min-height:32px;width:auto;font:inherit;font-size:14px;color:var(--muted);cursor:pointer;white-space:nowrap}
.lang span{white-space:nowrap}
.lang:hover{color:var(--text)}
.lang-menu{position:absolute;right:0;top:calc(100% + 12px);width:180px;padding:8px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-s);box-shadow:var(--shadow-panel)}
.lang-menu a{display:flex;align-items:center;min-height:44px;padding:8px 12px;text-decoration:none;font-size:14px;border-radius:var(--r-detail)}
.lang-menu a:hover,.lang-menu a[aria-current="true"]{background:var(--panel-2)}
.login{display:inline-flex;align-items:center;justify-content:center;height:40px;padding:0 24px;border:1.5px solid var(--text);border-radius:var(--r-pill);font-size:15px;color:var(--text);text-decoration:none;transition:background-color var(--ease),color var(--ease)}
.login:hover{background:var(--text);color:var(--on-accent)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;padding:8px;border:1px solid var(--border);border-radius:var(--r-s);background:var(--panel);font-size:22px;line-height:1}
.mobile-drawer{position:absolute;top:100%;left:0;right:0;background:var(--panel);padding:16px var(--gutter) 24px;border-bottom:1px solid var(--border);box-shadow:var(--shadow-panel);max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain}
.mobile-drawer ul{list-style:none;margin:0;padding:0}
.mobile-drawer li{margin:0}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;text-decoration:none;border-bottom:1px solid var(--border)}
.mobile-drawer a[aria-current]{font-weight:600;background:var(--panel-2)}
.mobile-languages{margin-top:20px}
.nav-veil{position:fixed;inset:var(--header-height) 0 0;background:var(--shadow-tint);z-index:35;border:0;width:100%}

.site-foot{background:var(--panel);border-top:1px solid var(--border);padding-top:64px;padding-bottom:32px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:48px}
.foot-grid>*{min-width:0}
.foot-brand p{color:var(--muted);font-size:15px;max-width:340px;margin-top:20px}
.foot-heading{margin:0 0 18px;font-family:var(--font-display);font-size:21px}
.foot-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 20px;list-style:none;margin:0;padding:0}
.foot-links li{margin:0}
.foot-links a,.foot-languages a,.foot-legal a{display:inline-flex;align-items:center;min-height:32px;font-size:14px;text-decoration:none}
.foot-links a:hover,.foot-legal a:hover{text-decoration:underline}
.foot-languages{display:flex;flex-wrap:wrap;gap:10px 24px;margin-top:36px;padding-top:24px;border-top:1px solid var(--border)}
.foot-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;margin-top:20px;font-size:13px;color:var(--muted)}
.foot-legal{display:flex;flex-wrap:wrap;gap:20px}

.f-paper{fill:var(--panel)}
.f-paper2{fill:var(--panel-2)}
.f-apricot{fill:var(--apricot)}
.f-accent{fill:var(--accent)}
.f-accent-dark{fill:var(--accent-dark)}
.f-taupe{fill:var(--taupe)}
.f-taupe-deep{fill:var(--taupe-deep)}
.s-paper{fill:none;stroke:var(--panel)}
.s-accent{fill:none;stroke:var(--accent)}
.st-hi{stop-color:var(--hero-top)}
.st-apricot{stop-color:var(--apricot)}
.st-apricot-deep{stop-color:var(--apricot-deep)}
.st-sand{stop-color:var(--sand)}
.st-paper2{stop-color:var(--panel-2)}
.st-taupe{stop-color:var(--taupe)}
.st-accent{stop-color:var(--accent)}
.st-accent-dark{stop-color:var(--accent-dark)}
.fl-r{fill:var(--flag-red)}
.fl-w{fill:var(--flag-white)}
.fl-b{fill:var(--flag-blue)}
.fl-k{fill:var(--flag-black)}
.fl-g{fill:var(--flag-gold)}
.fl-edge{fill:none;stroke:var(--border-deep);stroke-width:.8}
.ico-line{fill:none;stroke:currentColor;stroke-width:1.6;stroke-linecap:round;stroke-linejoin:round}
.ico-dot{fill:currentColor;stroke:none}
.flag{width:24px;height:16px;flex:none;display:block;border-radius:var(--r-frame);overflow:hidden}
.flag--s{width:18px;height:12px}

@media(max-width:1400px){
  .site-head__inner{padding-inline:24px}
  .nav{margin-left:28px}
  .nav ul{gap:18px}
  .head-tools{gap:14px}
}
@media(max-width:1200px){
  .nav{margin-left:24px}
  .nav ul{gap:14px}
  .nav a{font-size:14px}
  .login{padding-inline:20px}
}
@media(max-width:1080px){
  .nav{display:none}
  .menu-toggle{display:inline-flex}
  .head-tools{margin-left:auto}
}
@media(min-width:1081px){.mobile-drawer,.nav-veil{display:none!important}}
@media(max-width:768px){
  h1{font-size:clamp(28px,8.4vw,40px)}
  h2{font-size:32px}
  h3{font-size:25px}
  .sec{padding-top:56px;padding-bottom:56px}
  .grid--three{grid-template-columns:minmax(0,1fr)}
  .foot-grid{grid-template-columns:minmax(0,1fr);gap:32px}
  .foot-brand p{max-width:100%}
  .head-tools{gap:12px;margin-left:auto}
  .lang-picker{display:none}
  .btn,.btn-primary,.btn-secondary{min-height:48px;padding:11px 24px}
}
@media(max-width:640px){
  :root{--gutter:20px}
  .no-break{white-space:normal}
  .site-head__inner{padding-inline:var(--gutter)}
  .brand__word{font-size:20px}
  .head-tools{gap:8px;margin-left:auto}
  .login{padding-inline:18px}
  .grid--two{grid-template-columns:minmax(0,1fr)}
  .panel,.card{padding:22px}
  .tilt,[data-tilt]{transform:none!important}
  .decorated{max-width:100%}
  .foot-links{gap:6px 16px}
}
@media(max-width:360px){
  :root{--gutter:16px}
  .brand{gap:7px}
  .brand img{width:30px;height:30px}
  .login{padding-inline:14px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:0s!important;animation-duration:0s!important;animation-iteration-count:1!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}