:root{
  --bg:#F7F1E4;
  --hero-top:#FBF7EE;
  --hero-bot:#F2EADA;
  --panel:#FFFCF6;
  --panel-2:#EFE6D4;
  --panel-2-soft:rgba(239,230,212,.62);
  --border:#E2D6BF;
  --border-a70:rgba(226,214,191,.7);
  --accent:#0F8F6C;
  --accent-dark:#0A6A50;
  --sea:#2AA7A0;
  --text:#2A2219;
  --muted:#6E6252;
  --success:#3A9D4F;
  --warn:#C98A12;
  --error:#C2413A;
  --on-accent:#FFFFFF;
  --clear:transparent;
  --accent-a06:rgba(15,143,108,.06);
  --accent-a10:rgba(15,143,108,.10);
  --accent-a14:rgba(15,143,108,.14);
  --accent-a18:rgba(15,143,108,.18);
  --accent-a24:rgba(15,143,108,.24);
  --accent-a32:rgba(15,143,108,.32);
  --accent-dark-a30:rgba(10,106,80,.30);
  --success-a10:rgba(58,157,79,.10);
  --success-a18:rgba(58,157,79,.18);
  --success-a30:rgba(58,157,79,.30);
  --hi:rgba(255,255,255,.88);
  --hi-soft:rgba(255,255,255,.28);
  --mask:#000000;
  --veil:rgba(42,34,25,.24);
  --flag-red:#CC3340;
  --flag-navy:#25366E;
  --flag-white:#FFFFFF;
  --flag-edge:rgba(42,34,25,.16);
  --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,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-card:24px;
  --r-chip:16px;
  --r-tile:14px;
  --r-tag:8px;
  --r-control:10px;
  --r-focus:6px;
  --r-tray:36px;
  --r-flag:4px;
  --r-pill:999px;
  --r-circle:50%;
  --gutter:32px;
  --page-width:1240px;
  --reading-width:800px;
  --head-height:72px;
  --anchor-offset:88px;
  --toc-offset:88px;
  --toc-landing:164px;
  --display-size:68px;
  --title-size:42px;
  --body-size:16px;
  --small-size:14px;
  --motion-time:.2s;
  --paper-opacity:.03;
  --shadow-card:inset 0 1px 0 var(--hi),inset 0 0 0 1px var(--border-a70),0 24px 46px -20px var(--accent-a10),0 4px 12px -6px var(--accent-a10);
  --gradient-accent:linear-gradient(90deg,var(--accent),var(--sea));
  --grain:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.92' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0  0 0 0 0 0  0 0 0 0 0  0 0 0 1 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
html.nav-open{overflow:hidden}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:var(--body-size);font-weight:var(--weight-normal);line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
body::after{content:"";position:fixed;inset:0;pointer-events:none;z-index:60;background-image:var(--grain);background-size:160px 160px;opacity:var(--paper-opacity);mix-blend-mode:multiply}
[hidden]{display:none!important}
img{display:block;max-width:100%;height:auto}
svg{vertical-align:middle;flex-shrink:0}
a{color:inherit;text-underline-offset:3px}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
button,input,select,textarea{max-width:100%}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--r-focus)}
h1,h2,h3,h4{font-family:var(--font-display);color:var(--text);text-wrap:balance;overflow-wrap:break-word}
h1{font-weight:var(--weight-display);font-size:clamp(52px,5vw,var(--display-size));line-height:1.1;letter-spacing:-.02em}
h2{font-weight:var(--weight-display);font-size:var(--title-size);line-height:1.15;letter-spacing:-.02em}
h3{font-weight:var(--weight-bold);font-size:22px;line-height:1.35}
p{margin:0 0 20px;overflow-wrap:break-word}
code{font-family:var(--font-mono);overflow-wrap:anywhere;font-size:.9em}
pre{max-width:100%;overflow-x:auto;background:var(--panel-2);padding:24px;border-radius:var(--r-chip);line-height:1.7}
pre code{overflow-wrap:normal;white-space:pre}
.no-break{white-space:nowrap}
.wrap{width:100%;max-width:var(--page-width);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{width:100%;max-width:var(--reading-width);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:72px;padding-bottom:72px}
.section-head{margin-bottom:32px}
.section-head h2{margin:12px 0 16px}
.section-head p{max-width:42em;color:var(--muted)}
.eyebrow{margin:0;font-size:15px;font-weight:var(--weight-bold);color:var(--accent-dark);letter-spacing:.04em}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.grid-two,.grid-three,.grid-five{display:grid;gap:24px}
.grid-two{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-five{grid-template-columns:repeat(5,minmax(0,1fr))}
:where(.grid-two,.grid-three,.grid-five,.hero-grid,.footer-grid)>*{min-width:0}
.panel{background:var(--panel);border-radius:var(--r-card);padding:32px;box-shadow:var(--shadow-card);min-width:0}
.panel-inset{background:var(--panel-2);border-radius:var(--r-chip);padding:24px;min-width:0}
.actions{display:flex;align-items:center;gap:28px;margin-top:36px;flex-wrap:wrap}
.btn,.btn-primary,.btn-secondary{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:54px;padding:12px 32px;border-radius:var(--r-pill);font-size:17px;font-weight:var(--weight-bold);line-height:1.5;text-decoration:none;letter-spacing:.02em;border:0;flex-shrink:0;white-space:nowrap;transition:transform var(--motion-time) ease,box-shadow var(--motion-time) ease}
.btn-primary{background:var(--gradient-accent);color:var(--on-accent);box-shadow:inset 0 1px 0 var(--hi-soft),0 18px 34px -12px var(--accent-a32),0 6px 14px -6px var(--accent-a14)}
.btn-primary:hover,.btn-primary.is-hover{transform:translateY(-1px);box-shadow:inset 0 1px 0 var(--hi-soft),0 22px 40px -12px var(--accent-a32),0 8px 16px -6px var(--accent-a18)}
.btn-primary:active,.btn-primary.is-active{transform:translateY(1px)}
.btn-secondary{background:var(--panel);color:var(--accent-dark);box-shadow:inset 0 0 0 1.5px var(--accent-a32)}
.btn-secondary:hover{box-shadow:inset 0 0 0 1.5px var(--accent)}
.btn-primary:disabled,.btn-secondary:disabled{background:var(--panel-2);color:var(--muted);box-shadow:inset 0 0 0 1px var(--border);cursor:not-allowed;transform:none}
.btn-link{display:inline-flex;align-items:center;gap:8px;min-height:24px;font-size:17px;font-weight:var(--weight-semibold);color:var(--text);text-decoration:none}
.arr{color:var(--accent);transition:transform var(--motion-time) ease}
.btn-link:hover .arr{transform:translateX(3px)}
.button-focus{outline:2px solid var(--accent);outline-offset:3px}
.top{background:linear-gradient(180deg,var(--hero-top),var(--hero-bot));overflow-x:clip;max-width:100%}
.site-head{position:relative;z-index:50;border-bottom:1px solid var(--border-a70);background:var(--hero-top)}
.head-row{display:flex;align-items:center;height:var(--head-height);gap:28px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text);flex-shrink:0}
.brand-mark{width:32px;height:32px;flex-shrink:0;display:block}
.brand-en{font-family:var(--font-display);font-weight:var(--weight-display);font-size:20px;letter-spacing:-.01em}
.brand-zh{font-size:14px;font-weight:var(--weight-medium);color:var(--muted);padding-left:10px;border-left:1px solid var(--border);line-height:1.2}
.tabs-nav{margin-left:auto;min-width:0}
.tabs{display:flex;align-items:center;align-self:stretch;justify-content:center;margin:0;padding:0;list-style:none}
.tabs a{position:relative;display:flex;align-items:center;height:var(--head-height);padding:0 13px;font-size:15px;font-weight:var(--weight-medium);color:var(--muted);text-decoration:none;white-space:nowrap;transition:color var(--motion-time) ease}
.tabs a::after{content:"";position:absolute;left:13px;right:13px;bottom:-1px;height:3px;border-radius:var(--r-focus) var(--r-focus) 0 0;background:var(--clear)}
.tabs a:hover{color:var(--text)}
.tabs a:hover::after{background:var(--border)}
.tabs a[aria-current="page"]{color:var(--text);font-weight:var(--weight-bold)}
.tabs a[aria-current="page"]::after{background:var(--gradient-accent)}
.tools{display:flex;align-items:center;gap:14px;flex-shrink:0}
.language-control{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;min-height:36px;padding:6px 10px;border:0;background:var(--clear);color:var(--muted);font-size:14px;border-radius:var(--r-control)}
.lang-text{white-space:nowrap}
.lang:hover{color:var(--text);background:var(--panel-2-soft)}
.lang svg{width:16px;height:16px}
.gl{fill:none;stroke:currentColor;stroke-width:1.4}
.language-menu{position:absolute;right:0;top:calc(100% + 12px);width:180px;padding:8px;background:var(--panel);border-radius:var(--r-chip);box-shadow:var(--shadow-card);z-index:4}
.language-menu a{display:flex;align-items:center;min-height:44px;padding:8px 12px;text-decoration:none;border-radius:var(--r-control)}
.language-menu a:hover,.language-menu a[aria-current="true"]{background:var(--panel-2);color:var(--accent-dark)}
.login{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:8px 22px;border-radius:var(--r-pill);color:var(--accent-dark);font-weight:var(--weight-bold);font-size:15px;text-decoration:none;background:var(--panel);white-space:nowrap;box-shadow:inset 0 0 0 1.5px var(--accent-a32),0 8px 18px -12px var(--accent-a24)}
.login:hover{box-shadow:inset 0 0 0 1.5px var(--accent),0 10px 22px -12px var(--accent-a32)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;padding:8px;border:0;border-radius:var(--r-control);background:var(--panel-2);color:var(--text)}
.menu-toggle svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round}
.mobile-drawer{display:none}
.menu-veil{position:fixed;inset:var(--head-height) 0 0;background:var(--veil);z-index:-1;border:0;width:100%;height:calc(100dvh - var(--head-height));padding:0}
.site-footer{background:var(--panel-2);border-top:1px solid var(--border);padding-top:56px;padding-bottom:28px}
.footer-grid{display:grid;grid-template-columns:1.35fr 1fr 1fr 1fr;gap:40px}
.footer-brand p{margin:20px 0 0;max-width:26em;font-size:14px;color:var(--muted)}
.footer-title{margin:0 0 14px;font-size:15px;font-weight:var(--weight-bold)}
.footer-links{display:grid;gap:6px;list-style:none;margin:0;padding:0}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;padding-block:2px;text-decoration:none;font-size:14px;color:var(--muted)}
.footer-links a:hover{color:var(--accent-dark);text-decoration:underline}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;border-top:1px solid var(--border);margin-top:36px;padding-top:22px;font-size:13px;color:var(--muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px}
.footer-legal a{display:inline-flex;min-height:24px;align-items:center}
.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%;min-height:120px;overflow:hidden;margin-top:24px;margin-bottom:24px}
#server-status>*{min-width:0;max-width:100%}
#server-status+*{margin-top:24px}
.prose{min-width:0;overflow-wrap:break-word}
.prose h2{margin-top:48px;font-size:30px}
.prose h3{margin-top:32px}
.prose li{margin-block:8px}
.prose :where(ul,ol){padding-left:24px}
.help-section{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,2fr);gap:40px}
.help-section>*{min-width:0}
.decorated-section{position:relative;overflow-x:clip;max-width:100%}
@media(max-width:1180px){
  .head-row{gap:20px}
  .tabs a{padding-inline:9px;font-size:14px}
  .tabs a::after{left:9px;right:9px}
  .brand-zh{display:none}
  :root{--display-size:60px}
}
@media(max-width:1040px){
  .tabs-nav{display:none}
  .tools{margin-left:auto}
  .menu-toggle{display:inline-flex}
  .mobile-drawer:not([hidden]){display:block;position:absolute;left:0;right:0;top:100%;background:var(--panel);padding:16px var(--gutter) 24px;max-height:calc(100dvh - var(--head-height));overflow-y:auto;overscroll-behavior:contain;z-index:2;border-bottom:1px solid var(--border)}
  .mobile-drawer a{display:flex;align-items:center;width:100%;min-height:48px;padding:12px 16px;text-decoration:none;border-radius:var(--r-control)}
  .mobile-drawer a:hover,.mobile-drawer a[aria-current="page"]{background:var(--panel-2);color:var(--accent-dark)}
  .drawer-language-title{margin:16px 16px 8px;font-size:13px;color:var(--muted)}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid-five{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media(max-width:768px){
  :root{--display-size:40px;--title-size:32px}
  h1{font-size:clamp(28px,6vw,40px)}
  .grid-three{grid-template-columns:1fr}
  .help-section{grid-template-columns:1fr}
}
@media(max-width:640px){
  :root{--gutter:16px;--head-height:64px;--anchor-offset:80px;--toc-offset:12px;--toc-landing:88px}
  .no-break{white-space:normal}
  .head-row{gap:12px}
  .brand-en{font-size:18px}
  .tools{margin-left:auto;gap:4px}
  .lang-text{display:none}
  .lang{padding-inline:8px}
  .login{min-height:36px;padding:7px 16px;font-size:14px}
  .grid-two,.grid-five,.footer-grid{grid-template-columns:1fr}
  .section{padding-top:48px;padding-bottom:48px}
  .panel{padding:24px}
  .actions{gap:20px;margin-top:24px}
  .btn,.btn-primary,.btn-secondary{min-height:50px;padding:12px 28px;font-size:16px}
  .btn-link{font-size:16px}
  .tilt,.import-tilt{transform:none!important}
  .decorated-section,.stripe-halo{max-width:100%}
  .footer-grid{gap:28px}
  .footer-bottom{align-items:flex-start}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}