:root{
  color-scheme:light;
  --bg:#F7F1E6;
  --bg-top:#FBF7EF;
  --bg-end:#F1E8D8;
  --panel:#FFFCF6;
  --groove:#EFE6D6;
  --line:#E3D8C5;
  --line-strong:#D3C5AE;
  --accent:#D94F3D;
  --accent-dark:#B23A2B;
  --text:#2A211A;
  --muted:#6E6152;
  --success:#2F8A63;
  --warn:#C08419;
  --error:#A8302A;
  --ink:#2F4F74;
  --on-dark:#F7F1E6;
  --on-dark-muted:#BCAE9B;
  --accent-tint:rgba(217,79,61,.10);
  --accent-line:rgba(217,79,61,.65);
  --halo:rgba(217,79,61,.11);
  --halo-soft:rgba(217,79,61,.05);
  --grain:rgba(42,33,26,.03);
  --shade:rgba(42,33,26,.10);
  --veil:rgba(42,33,26,.38);
  --device:#241B15;
  --device-hi:#352920;
  --device-notch:#17110D;
  --wall-a:#7A3427;
  --wall-b:#3B1A12;
  --wall-glow:rgba(255,252,246,.10);
  --hl:rgba(255,252,246,.30);
  --hl-soft:rgba(255,252,246,.07);
  --sh-device:0 40px 100px -24px rgba(217,79,61,.12),0 16px 30px -16px rgba(42,33,26,.38);
  --sh-window:0 30px 50px -22px rgba(20,10,6,.6),0 0 0 1px rgba(255,252,246,.06);
  --sh-float:0 26px 56px -18px rgba(217,79,61,.16),0 8px 18px -8px rgba(42,33,26,.16);
  --sh-chip:0 1px 0 rgba(255,252,246,.9) inset,0 6px 16px -10px rgba(217,79,61,.14);
  --sh-btn:0 1px 0 rgba(255,252,246,.28) inset,0 12px 26px -12px rgba(178,58,43,.55);
  --flag-red:#D52B2B;
  --flag-white:#FBFAF6;
  --flag-blue:#253E7A;
  --flag-green:#1F8A4E;
  --flag-black:#1E1915;
  --flag-gold:#F2C230;
  --flag-edge:rgba(42,33,26,.18);
  --r-xs:4px;
  --r-sm:6px;
  --r:10px;
  --r-screen:9px;
  --r-device:18px;
  --r-panel:16px;
  --r-pill:999px;
  --r-circle:50%;
  --f-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Microsoft YaHei","Malgun Gothic",system-ui,sans-serif;
  --f-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Microsoft YaHei","Malgun Gothic",system-ui,sans-serif;
  --f-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --gutter:24px;
  --content-max:1288px;
  --reading-max:800px;
  --size-body:16px;
  --size-small:14px;
  --size-h1:clamp(52px,4.6vw,66px);
  --size-h2:clamp(28px,3vw,40px);
  --weight-body:400;
  --weight-medium:500;
  --weight-semibold:600;
  --weight-bold:700;
  --leading-body:1.6;
  --leading-title:1.1;
  --tracking-title:-.02em;
  --section-space:80px;
  --anchor-space:88px;
  --toc-top:12px;
  --toc-anchor:88px;
  --ease: .15s ease;
  --reveal-time:.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;font:var(--weight-body) var(--size-body)/var(--leading-body) var(--f-body);color:var(--text);background:radial-gradient(var(--grain) .5px,transparent 1px) 0 0/3px 3px,radial-gradient(var(--grain) .5px,transparent 1px) 1px 2px/5px 5px,var(--bg);-webkit-font-smoothing:antialiased}
html.nav-open{overflow:hidden}
[hidden]{display:none!important}
img,video{max-width:100%;height:auto}
svg{flex-shrink:0}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button,a,input,summary,select,textarea{-webkit-tap-highlight-color:var(--accent-tint)}
button{border:0}
a{color:inherit;text-underline-offset:4px}
a,button,summary{touch-action:manipulation}
: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);font-weight:var(--weight-bold);letter-spacing:var(--tracking-title);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--size-h1);line-height:var(--leading-title);margin:0 0 24px}
h2{font-size:var(--size-h2);line-height:1.2;margin:0 0 24px}
h3{font-size:22px;line-height:1.35;margin:0 0 16px}
p{margin:0 0 20px}
small{font-size:var(--size-small)}
strong{font-weight:var(--weight-semibold)}
code{font-family:var(--f-mono);overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:24px;border:1px solid var(--line);border-radius:var(--r);background:var(--groove)}
pre code{overflow-wrap:normal;white-space:pre}
input,textarea,select{max-width:100%;border:1px solid var(--line-strong);border-radius:var(--r-sm);background:var(--panel);padding:10px 12px}
:where(main,section,article,aside,nav,div,li){min-width:0}
.wrap{width:100%;max-width:var(--content-max);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{width:100%;max-width:var(--reading-max);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:var(--section-space);padding-bottom:var(--section-space)}
.section-head{max-width:800px;margin-bottom:32px}
.section-head p,.muted{color:var(--muted)}
.no-break{white-space:nowrap}
.mono{font-family:var(--f-mono)}
.accent{color:var(--accent)}
.panel,.card{border:1px solid var(--line);border-radius:var(--r);background:var(--panel);box-shadow:var(--sh-chip);padding:24px}
.groove{background:var(--groove);border-radius:var(--r);padding:24px}
.grid-three{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.icon{width:20px;height:20px}
.btn,.btn-main,.btn-primary,.btn-secondary{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:48px;padding:12px 26px;border:1px solid transparent;border-radius:var(--r-sm);font:var(--weight-semibold) 16px/1.3 var(--f-body);text-decoration:none;flex-shrink:0;white-space:nowrap;transition:transform var(--ease),background var(--ease)}
.btn-main,.btn-primary{background:linear-gradient(180deg,var(--accent) 0%,var(--accent) 45%,var(--accent-dark) 100%);color:var(--panel);box-shadow:var(--sh-btn)}
.btn-main:hover,.btn-primary:hover{transform:translateY(-1px)}
.btn-main:active,.btn-primary:active{transform:translateY(1px);background:var(--accent-dark)}
.btn-secondary{border-color:var(--line-strong);background:var(--panel);color:var(--text);box-shadow:var(--sh-chip)}
.btn-secondary:hover{background:var(--groove)}
.btn:disabled,.btn-primary:disabled,.btn-secondary:disabled{opacity:.55;cursor:not-allowed;transform:none}
.btn-main svg,.btn-primary svg{width:16px;height:16px}
.btn-link{display:inline-flex;align-items:center;min-height:24px;font:var(--weight-semibold) 16px/1.3 var(--f-body);color:var(--text);text-decoration:underline;text-decoration-thickness:1.5px;text-underline-offset:7px}
.btn-link:hover{text-decoration-color:var(--accent)}
.cta-row{display:flex;align-items:center;justify-content:center;gap:28px;margin-top:24px;flex-wrap:wrap}
.notice{background:var(--text);color:var(--on-dark)}
.notice .wrap{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:38px}
.notice-msg{display:flex;align-items:center;gap:10px;font:var(--weight-medium) 12.5px/1.4 var(--f-mono);letter-spacing:.08em}
.notice-msg svg,.notice-msg img{width:15px;height:15px;flex:none}
.notice-link{display:inline-flex;align-items:center;min-height:24px;font:var(--weight-medium) 12.5px/1.4 var(--f-mono);letter-spacing:.08em;color:var(--on-dark);text-decoration:underline;text-decoration-color:var(--accent-line);text-underline-offset:5px;white-space:nowrap}
.notice-link:hover{color:var(--panel);text-decoration-color:var(--accent)}
#site-header{position:relative;z-index:100}
.masthead{position:relative;z-index:103;background:var(--bg-top);border-bottom:1px solid var(--line)}
.masthead .wrap{display:flex;align-items:center;gap:32px;height:60px;flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:var(--text);font:var(--weight-bold) 19px/1 var(--f-display);letter-spacing:-.02em;flex:none;min-height:28px}
.brand img{width:28px;height:28px;flex:none}
.topnav{flex:1;display:flex;justify-content:center;min-width:0}
.topnav ul,.topnav ol{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:0}
.topnav li{display:flex;align-items:center;white-space:nowrap}
.topnav li+li::before{content:"·";color:var(--line-strong);margin:0 10px;font-weight:var(--weight-bold)}
.topnav a{display:inline-flex;align-items:center;min-height:32px;font-size:14px;color:var(--muted);text-decoration:none;padding:6px 1px;transition:color var(--ease)}
.topnav a:hover{color:var(--text)}
.topnav a[aria-current="page"]{color:var(--text);font-weight:var(--weight-semibold);box-shadow:inset 0 -2px 0 var(--accent)}
.tools{display:flex;align-items:center;gap:14px;flex-shrink:0;margin-left:auto}
.lang-picker{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:5px;min-height:36px;width:auto;border:0;background:none;padding:6px 4px;font:var(--weight-medium) 14px/1 var(--f-body);color:var(--text);white-space:nowrap}
.lang span{white-space:nowrap}
.lang-panel{display:none;position:absolute;right:0;top:calc(100% + 8px);z-index:110;min-width:172px;padding:8px;border:1px solid var(--line);border-radius:var(--r);background:var(--panel);box-shadow:var(--sh-float)}
.lang-picker.is-open .lang-panel{display:block}
.lang-panel a{display:flex;align-items:center;min-height:40px;padding:8px 12px;text-decoration:none;border-radius:var(--r-sm);white-space:nowrap}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--groove);color:var(--accent-dark)}
.login{display:inline-flex;align-items:center;justify-content:center;min-height:36px;padding:8px 18px;border-radius:var(--r-sm);background:var(--text);color:var(--panel);font-size:14px;line-height:1.3;font-weight:var(--weight-semibold);text-decoration:none;box-shadow:0 1px 0 var(--hl) inset;white-space:nowrap}
.login:hover{background:var(--device-hi)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;padding:10px;border:1px solid var(--line);border-radius:var(--r-sm);color:var(--text);background:var(--panel)}
.menu-line{display:block;width:20px;height:2px;background:currentColor}
.nav-drawer{display:none;position:fixed;inset-inline:0;top:var(--header-bottom,98px);z-index:102;height:calc(100dvh - var(--header-bottom,98px));max-height:calc(100dvh - var(--header-bottom,98px));overflow-y:auto;overscroll-behavior:contain;background:var(--panel);padding:16px var(--gutter) 32px}
.nav-drawer a{display:flex;align-items:center;min-height:44px;width:100%;padding:12px 16px;text-decoration:none;border-bottom:1px solid var(--line)}
.nav-drawer a[aria-current="page"]{background:var(--groove);color:var(--accent-dark)}
.drawer-languages{display:grid;margin-top:20px;border-top:1px solid var(--line)}
.nav-veil{display:none;position:fixed;inset:var(--header-bottom,98px) 0 0;z-index:101;background:var(--veil);width:100%;cursor:pointer}
.site-footer{border-top:1px solid var(--line);background:var(--bg-end);padding-top:56px;padding-bottom:28px}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:48px}
.footer-brand p{max-width:340px;margin-top:20px;color:var(--muted);font-size:14px}
.footer-title{font-size:15px;letter-spacing:0;margin-bottom:16px}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 16px}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:28px;font-size:14px;text-decoration:none}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{text-decoration:underline;text-decoration-color:var(--accent)}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 24px;margin-top:32px;padding-top:24px;border-top:1px solid var(--line-strong)}
.footer-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:16px;margin-top:24px;font-size:13px;color:var(--muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px}
.prose{overflow-wrap:break-word}
.prose h2{margin-top:56px}
.prose h3{margin-top:32px}
.prose li{margin-bottom:8px}
.prose a{overflow-wrap:anywhere}
.reveal{transition:opacity var(--reveal-time) ease,transform var(--reveal-time) ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:static;display:block;overflow:hidden;max-width:100%;margin-top:24px;margin-bottom:24px}
#server-status+*{margin-top:24px}
.decorated,.stripe-halo{overflow-x:clip;max-width:100%}
@media(min-width:961px) and (max-width:1279px){
  .masthead .wrap{gap:20px}
  .topnav li+li::before{margin:0 6px}
  .topnav a{font-size:13px}
}
@media(max-width:1100px){
  .masthead .wrap{gap:16px}
  .topnav li+li::before{margin:0 5px}
  .tools{gap:10px}
}
@media(max-width:960px){
  .topnav{display:none}
  .menu-toggle{display:flex}
  .tools{margin-left:auto}
  .nav-drawer.is-open,.nav-veil.is-open{display:block}
  .footer-grid{gap:32px;grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1/-1}
}
@media(max-width:768px){
  :root{--section-space:48px;--size-h1:34px}
  h1{line-height:1.2}
  .grid-three{grid-template-columns:1fr}
  .notice .wrap{padding-block:10px;flex-wrap:wrap;gap:6px 16px}
  .footer-grid{grid-template-columns:1fr}
  .footer-brand{grid-column:auto}
  .section-head{margin-bottom:24px}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .tilt,.note{transform:none}
  .decorated,.stripe-halo{max-width:100%}
  .masthead .wrap{gap:8px}
  .brand{font-size:17px;gap:6px}
  .brand img{width:25px;height:25px}
  .tools{gap:6px;margin-left:auto}
  .lang{font-size:12px;padding-inline:3px}
  .login{padding:8px 12px;font-size:13px}
  .footer-bottom{flex-direction:column}
}
@media(max-width:359px){
  .brand{font-size:15px;gap:4px}
  .brand img{width:23px;height:23px}
  .tools{gap:4px}
  .login{padding-inline:9px}
  .lang{font-size:11px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}