:root {
  --bg:#FAF5EC;
  --bg-panel:#FFFDF8;
  --bg-panel-2:#F3EBDD;
  --bg-hero-top:#FDF9F2;
  --border:#E6DBC8;
  --accent:#2E66E6;
  --accent-dark:#1B47B8;
  --text:#2A2118;
  --text-muted:#6E6052;
  --success:#2E9A57;
  --warn:#C98A12;
  --error:#C8402F;
  --white:#FFFFFF;
  --c-blue:#2E66E6;
  --c-violet:#7B5CF0;
  --c-pink:#E85BB8;
  --c-green:#3FB86A;
  --c-yellow:#F6C23A;
  --c-orange:#F7873A;
  --flag-red:#D8262E;
  --flag-blue:#2B3F8F;
  --flag-white:#FFFFFF;
  --arrow-black:#17130F;
  --clear:transparent;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --r-gate:44px;
  --r-card:28px;
  --r-panel:20px;
  --r-tile:22px;
  --r-small:8px;
  --r-flag:3px;
  --r-icon:30px;
  --r-key:.2em;
  --r-pill:999px;
  --r-round:50%;
  --nav-h:72px;
  --toc-h:64px;
  --gutter:24px;
  --wrap-width:1240px;
  --reading-width:800px;
  --h1-size:70px;
  --text-body:16px;
  --text-small:14px;
  --text-tiny:12px;
  --text-lede:20px;
  --weight-regular:400;
  --weight-medium:500;
  --weight-semibold:600;
  --weight-bold:700;
  --weight-display:800;
  --shadow-float:0 16px 36px color-mix(in srgb,var(--text) 10%,transparent),0 2px 6px color-mix(in srgb,var(--text) 6%,transparent);
  --shadow-card:0 20px 44px color-mix(in srgb,var(--accent) 9%,transparent),0 4px 12px color-mix(in srgb,var(--text) 5%,transparent);
  --focus-ring:color-mix(in srgb,var(--accent) 65%,transparent);
  --ease: cubic-bezier(.2,.7,.2,1);
  --time-fast:.2s;
  --time-reveal:.35s;
  --noise-opacity:.03;
  --noise-image: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 1.6 -.3'/%3E%3C/filter%3E%3Crect width='180' height='180' filter='url(%23g)'/%3E%3C/svg%3E");
  --k:1;
  --main-w:860px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:calc(var(--nav-h) + 16px)}
body{margin:0;background:var(--bg);color:var(--text);font:var(--weight-regular) var(--text-body)/1.6 var(--font-body);-webkit-font-smoothing:antialiased;overflow-x:clip}
body::after{content:"";position:fixed;inset:0;z-index:60;pointer-events:none;background:var(--text);opacity:var(--noise-opacity);-webkit-mask-image:var(--noise-image);mask-image:var(--noise-image);-webkit-mask-size:180px 180px;mask-size:180px 180px}
[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{cursor:pointer}
button:disabled{cursor:not-allowed}
a{color:inherit;text-underline-offset:.2em}
button,a,input,summary,select,textarea{-webkit-tap-highlight-color:var(--clear)}
:focus-visible{outline:3px solid var(--focus-ring);outline-offset:3px;border-radius:var(--r-small)}
h1,h2,h3,h4,p,ul,ol,blockquote,pre,figure{margin-top:0}
h1,h2,h3{font-family:var(--font-display);text-wrap:balance}
h1{font-size:clamp(52px,5vw,72px);line-height:1.12;letter-spacing:-.02em;font-weight:var(--weight-display);margin-bottom:24px}
h2{font-size:clamp(28px,3.2vw,42px);line-height:1.25;letter-spacing:-.02em;font-weight:var(--weight-display);margin-bottom:24px}
h3{font-size:22px;line-height:1.4;font-weight:var(--weight-bold);margin-bottom:12px}
p{margin-bottom:20px}
small,.small{font-size:var(--text-small)}
strong{font-weight:var(--weight-bold)}
hr{border:0;border-top:1px solid var(--border);margin-block:32px}
code,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere;font-size:.9em;background:var(--bg-panel-2);border-radius:var(--r-small);padding:.12em .35em}
pre{max-width:100%;overflow-x:auto;padding:24px;border-radius:var(--r-panel);background:var(--bg-panel-2);line-height:1.7}
pre code{padding:0;background:var(--clear);white-space:pre;overflow-wrap:normal}
table{border-collapse:collapse}
th{text-align:left}
.wrap{width:100%;max-width:var(--wrap-width);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{width:100%;max-width:var(--reading-width);margin-inline:auto;padding-inline:var(--gutter)}
.sec{padding-top:80px;padding-bottom:80px}
.sec--compact{padding-top:48px;padding-bottom:48px}
.wrap > *,.reading-wrap > *,.grid > *,.topbar__in > *{min-width:0}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.stack > * + *{margin-top:24px}
.center{text-align:center}
.muted{color:var(--text-muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.no-break{white-space:nowrap}
.br-narrow{display:none}
.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}
.skip{position:absolute;left:16px;top:-80px;z-index:80;padding:8px 16px;border-radius:var(--r-pill);background:var(--text);color:var(--bg-panel);text-decoration:none;font-weight:var(--weight-bold)}
.skip:focus{top:12px}
.icon{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.panel,.card{background:var(--bg-panel);border-radius:var(--r-card);padding:32px;box-shadow:var(--shadow-card)}
.panel{border-radius:var(--r-panel);box-shadow:inset 0 0 0 1px var(--border),var(--shadow-card)}
.badge,.chip{display:inline-flex;align-items:center;gap:8px;max-width:100%;min-height:28px;padding:5px 12px;border-radius:var(--r-pill);background:var(--bg-panel-2);color:var(--text);font-size:var(--text-tiny);font-weight:var(--weight-bold);overflow-wrap:anywhere}
.badge--blue{background:var(--accent-dark);color:var(--white)}
.badge--success{color:var(--success)}
.badge__dot{width:7px;height:7px;flex-shrink:0;border-radius:var(--r-round);background:var(--success)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:56px;padding:14px 32px;border:0;border-radius:var(--r-pill);font:var(--weight-bold) 17px/1.3 var(--font-body);text-decoration:none;flex-shrink:0;white-space:nowrap;transition:background-color var(--time-fast),transform var(--time-fast),box-shadow var(--time-fast)}
.btn svg{width:18px;height:18px}
.btn--primary,.btn-primary{background:var(--accent);color:var(--white);box-shadow:inset 0 1px 0 color-mix(in srgb,var(--white) 28%,transparent),0 14px 30px color-mix(in srgb,var(--accent) 26%,transparent),0 2px 6px color-mix(in srgb,var(--accent-dark) 20%,transparent)}
.btn--primary:hover,.btn-primary:hover{background:var(--accent-dark);transform:translateY(-1px)}
.btn--ghost,.btn-secondary{background:var(--bg-panel-2);color:var(--accent);box-shadow:inset 0 0 0 1px color-mix(in srgb,var(--border) 80%,transparent),inset 0 1px 0 color-mix(in srgb,var(--white) 70%,transparent)}
.btn--ghost:hover,.btn-secondary:hover{background:color-mix(in srgb,var(--bg-panel-2) 70%,var(--border));transform:translateY(-1px)}
.btn:active,.btn.is-active{transform:translateY(1px)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.5;box-shadow:none;transform:none;pointer-events:none}
.btn--small{min-height:44px;font-size:var(--text-small);padding:10px 20px}
.btn--focus{outline:3px solid var(--focus-ring);outline-offset:3px}
.cta{display:flex;flex-wrap:wrap;justify-content:center;gap:16px;margin:0 0 24px}
#site-header{position:sticky;top:0;z-index:50;min-height:var(--nav-h)}
.topbar{position:relative;z-index:53;min-height:var(--nav-h);background:color-mix(in srgb,var(--bg-panel) 82%,transparent);-webkit-backdrop-filter:blur(16px) saturate(1.3);backdrop-filter:blur(16px) saturate(1.3);border-bottom:1px solid color-mix(in srgb,var(--border) 72%,transparent)}
.topbar__in{max-width:1392px;margin:0 auto;min-height:var(--nav-h);padding:0 24px;display:flex;align-items:center;gap:24px;flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:var(--text);flex-shrink:0}
.brand__mark{display:block;width:34px;height:34px;filter:drop-shadow(0 6px 10px color-mix(in srgb,var(--accent) 22%,transparent))}
.brand__word{font:var(--weight-display) 19px/1 var(--font-display);letter-spacing:-.02em}
.desktop-nav{flex:1;min-width:0}
.menu{display:flex;align-items:center;justify-content:center;gap:2px;list-style:none;margin:0;padding:0}
.menu a{display:inline-flex;align-items:center;gap:6px;min-height:36px;padding:8px 12px;border-radius:var(--r-pill);color:var(--text);text-decoration:none;font:var(--weight-semibold) var(--text-small)/1.2 var(--font-body);white-space:nowrap;transition:background-color var(--time-fast),color var(--time-fast)}
.menu svg{width:16px;height:16px;color:var(--text-muted)}
.menu a:hover{background:color-mix(in srgb,var(--bg-panel-2) 80%,transparent)}
.menu a:hover svg,.menu a[aria-current="page"] svg{color:var(--accent)}
.menu a[aria-current="page"]{background:var(--bg-panel-2);box-shadow:inset 0 0 0 1px color-mix(in srgb,var(--border) 70%,transparent)}
.actions{display:flex;align-items:center;gap:8px;flex-shrink:0;margin-left:auto}
.language{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:36px;min-width:44px;width:auto;padding:8px 12px;border:0;border-radius:var(--r-pill);background:var(--clear);color:var(--text-muted);font:var(--weight-semibold) var(--text-small)/1.2 var(--font-body);white-space:nowrap}
.lang span{white-space:nowrap}
.lang svg{width:16px;height:16px}
.lang:hover{background:var(--bg-panel-2);color:var(--text)}
.lang-panel{position:absolute;right:0;top:calc(100% + 12px);z-index:56;width:192px;padding:8px;background:var(--bg-panel);border-radius:var(--r-panel);box-shadow:var(--shadow-float);border:1px solid var(--border)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:10px 14px;border-radius:var(--r-small);text-decoration:none;font-size:var(--text-small)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--bg-panel-2);color:var(--accent-dark)}
.login{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:40px;padding:10px 18px;border-radius:var(--r-pill);background:var(--accent);color:var(--white);text-decoration:none;font:var(--weight-bold) var(--text-small)/1.2 var(--font-body);white-space:nowrap;box-shadow:inset 0 1px 0 color-mix(in srgb,var(--white) 28%,transparent),0 8px 18px color-mix(in srgb,var(--accent) 24%,transparent)}
.login svg{width:16px;height:16px}
.login:hover{background:var(--accent-dark)}
.nav-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;padding:10px;background:var(--bg-panel-2);border:0;border-radius:var(--r-pill);color:var(--text)}
.nav-toggle svg{width:20px;height:20px}
.nav-drawer{position:fixed;top:var(--nav-h);right:0;z-index:52;width:min(420px,100%);height:calc(100dvh - var(--nav-h));max-height:calc(100dvh - var(--nav-h));overflow-y:auto;overscroll-behavior:contain;padding:20px var(--gutter) 32px;background:var(--bg-panel);box-shadow:var(--shadow-float)}
.nav-drawer ul{display:flex;flex-direction:column;align-items:stretch;gap:4px;list-style:none;margin:0;padding:0}
.nav-drawer a{display:flex;align-items:center;gap:12px;width:100%;min-height:48px;padding:12px 16px;border-radius:var(--r-small);text-decoration:none;font-weight:var(--weight-semibold)}
.nav-drawer svg{width:18px;height:18px;color:var(--text-muted)}
.nav-drawer a:hover,.nav-drawer a[aria-current]{background:var(--bg-panel-2);color:var(--accent-dark)}
.drawer-languages{margin-top:20px;padding-top:20px;border-top:1px solid var(--border)}
.nav-veil{position:fixed;inset:var(--nav-h) 0 0;z-index:51;border:0;background:color-mix(in srgb,var(--text) 30%,transparent);cursor:pointer}
html.nav-open{overflow:hidden}
.site-footer{background:var(--bg-panel-2);border-top:1px solid var(--border);padding-top:56px;padding-bottom:24px}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:48px}
.footer-brand p{max-width:340px;color:var(--text-muted);margin-top:20px}
.footer-title{font-size:var(--text-small);font-weight:var(--weight-bold);margin-bottom:16px}
.footer-links{display:flex;flex-wrap:wrap;gap:8px 20px;list-style:none;margin:0;padding:0}
.footer-links li{min-width:0}
.footer-links a{display:inline-flex;align-items:center;min-height:32px;font-size:var(--text-small);text-decoration:none;overflow-wrap:anywhere}
.footer-links a:hover{color:var(--accent-dark);text-decoration:underline}
.footer-languages{margin-top:32px;padding-top:24px;border-top:1px solid var(--border)}
.footer-bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;margin-top:24px;color:var(--text-muted);font-size:var(--text-tiny)}
.footer-bottom p{margin:0}
.prose{overflow-wrap:anywhere}
.prose p,.prose li{line-height:1.9}
.prose h2{margin-top:56px}
.prose h3{margin-top:32px}
.prose a{color:var(--accent-dark)}
.prose a.btn--primary,.prose a.btn-primary{color:var(--white)}
.prose li + li{margin-top:8px}
.prose section{min-width:0}
.reveal{transition:opacity var(--time-reveal) var(--ease),transform var(--time-reveal) var(--ease)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{display:block;position:relative;min-height:120px;min-width:0;max-width:100%;overflow:hidden;margin-block:24px}
#server-status + *{margin-top:32px}
#server-status > *{min-width:0;max-width:100%}
.fl-red{fill:var(--flag-red)}
.fl-white{fill:var(--flag-white)}
.fl-blue{fill:var(--flag-blue)}
.fl-edge{fill:none;stroke:var(--text);stroke-opacity:.14;stroke-width:.5}
.flag{display:block;width:24px;height:16px;border-radius:var(--r-flag);overflow:hidden}
.flag--sq{width:16px;height:16px}
@media(min-width:1261px) and (max-width:1390px){
  .topbar__in{gap:14px;padding-inline:20px}
  .menu a{padding-inline:8px;font-size:13px}
  .menu{gap:3px}
  .lang{padding-inline:8px}
}
@media(max-width:1260px){
  .desktop-nav{display:none}
  .nav-toggle{display:inline-flex}
  .actions{margin-left:auto}
}
@media(min-width:1261px){
  .nav-drawer,.nav-veil{display:none!important}
  html.nav-open{overflow:auto}
}
@media(max-width:768px){
  h1{font-size:clamp(28px,6vw,40px)}
  .grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .footer-brand{grid-column:1/-1}
  .sec{padding-top:56px;padding-bottom:56px}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .br-narrow{display:block}
  .grid,.footer-grid{grid-template-columns:minmax(0,1fr)}
  .topbar__in{padding-inline:var(--gutter);gap:8px}
  .brand{gap:7px}
  .brand__mark{width:28px;height:28px}
  .brand__word{font-size:16px}
  .actions{gap:4px;margin-left:auto}
  .login{min-height:36px;padding:8px 12px;font-size:13px}
  .login svg{display:none}
  .lang{padding-inline:7px;font-size:12px}
  .lang svg{display:none}
  .nav-toggle{padding:10px}
  .panel,.card{padding:24px}
  .tilt,[data-tilt]{transform:none}
  .hero,.preview,.decor-section{max-width:100%;overflow-x:clip}
  .footer-grid{gap:24px}
  .footer-bottom{align-items:flex-start;flex-direction:column}
}
@media(max-width:359px){
  .brand__mark{width:24px;height:24px}
  .brand__word{font-size:14px}
  .brand{gap:5px}
  .topbar__in{gap:4px}
  .lang{padding-inline:5px;font-size:11px}
  .login{padding-inline:10px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}