:root{
  color-scheme:light;
  --c-bg:#F3F4F1;
  --c-panel:#FFFFFF;
  --c-panel-2:#E8EAE5;
  --c-panel-soft:#F7F8F5;
  --c-border:#D8DBD3;
  --c-accent:#6BE000;
  --c-accent-hi:#A4EE58;
  --c-accent-dark:#3B7F00;
  --c-ink:#121410;
  --c-ink-2:#23271F;
  --c-muted:#5D6258;
  --c-on-ink:#FFFFFF;
  --c-on-ink-2:#9DA396;
  --c-success:#1E9B57;
  --c-warn:#D58A0C;
  --c-error:#D3263C;
  --c-clear:transparent;
  --a-accent-06:rgba(107,224,0,.06);
  --a-accent-10:rgba(107,224,0,.10);
  --a-accent-12:rgba(107,224,0,.12);
  --a-accent-18:rgba(107,224,0,.18);
  --a-accent-28:rgba(107,224,0,.28);
  --a-accent-40:rgba(107,224,0,.40);
  --a-dark-30:rgba(59,127,0,.30);
  --a-ink-06:rgba(18,20,16,.06);
  --a-ink-12:rgba(18,20,16,.12);
  --a-ink-24:rgba(18,20,16,.24);
  --a-ink-40:rgba(18,20,16,.40);
  --a-white-12:rgba(255,255,255,.12);
  --flag-red:#CF2033;
  --flag-blue:#27377F;
  --flag-gold:#F2C230;
  --flag-black:#121410;
  --flag-white:#FFFFFF;
  --font-display:"Inter","Noto Sans SC","Noto Sans JP","Noto Sans KR","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","Noto Sans JP","Noto Sans KR","PingFang SC","Hiragino Sans","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --fs-xs:12px;
  --fs-sm:13px;
  --fs-nav:14px;
  --fs-button:15px;
  --fs-body:16px;
  --fs-lede:18px;
  --fs-h3:22px;
  --fs-h2:clamp(28px,3.2vw,40px);
  --fs-h1:clamp(52px,5.2vw,68px);
  --fs-hero:68px;
  --fs-mobile-h1:40px;
  --fs-caption:11px;
  --fs-chrome:11.5px;
  --fs-detail:12.5px;
  --fs-bubble:13.5px;
  --fs-price:40px;
  --weight-body:400;
  --weight-medium:600;
  --weight-bold:700;
  --weight-brand:800;
  --weight-display:900;
  --tracking-display:-.03em;
  --tracking-cjk:-.02em;
  --tracking-small:-.01em;
  --r-flag:3px;
  --r-flag-lg:5px;
  --r-line:2px;
  --r-xs:6px;
  --r-sm:8px;
  --r-md:10px;
  --r-lg:12px;
  --r-pill:999px;
  --r-circle:50%;
  --gutter:24px;
  --content-max:1248px;
  --header-height:64px;
  --anchor-offset:80px;
  --toc-offset:88px;
  --glow-window:0 0 24px var(--a-accent-28),0 0 80px var(--a-accent-12),0 28px 56px -32px var(--a-dark-30),inset 0 0 0 1px var(--c-panel);
  --shadow-card:0 8px 22px var(--a-accent-10),0 1px 2px var(--a-ink-06);
  --shadow-float:0 8px 24px var(--a-accent-28),0 2px 6px var(--a-ink-06);
  --shadow-ink:0 12px 24px -12px var(--a-ink-40);
  --ease-ui:cubic-bezier(.2,.65,.3,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
body{margin:0;background:var(--c-bg);color:var(--c-ink);font-family:var(--font-body);font-size:var(--fs-body);line-height:1.5;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button{border:0;background:var(--c-clear)}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
p{margin:0}
ul{list-style:none;margin:0;padding:0}
h1,h2,h3{font-family:var(--font-display);font-weight:var(--weight-bold);margin:0 0 20px;text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--fs-h1);font-weight:var(--weight-display);line-height:1.12;letter-spacing:var(--tracking-cjk)}
h2{font-size:var(--fs-h2);line-height:1.2;letter-spacing:var(--tracking-cjk)}
h3{font-size:var(--fs-h3);line-height:1.35}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;border-radius:var(--r-md);background:var(--c-panel-2)}
pre code{overflow-wrap:normal;white-space:pre}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--c-accent-dark);outline-offset:3px}
[hidden]{display:none!important}
.no-break{white-space:nowrap}
.wrap{width:100%;max-width:var(--content-max);padding-inline:var(--gutter);margin-inline:auto}
.section{padding-top:72px;padding-bottom:72px}
.section-head{margin-bottom:28px}
.section-head p{color:var(--c-muted);max-width:72ch}
.reading-wrap{max-width:880px}
.prose{overflow-wrap:break-word;line-height:1.85}
.prose p,.prose ul,.prose ol{margin-bottom:20px}
.prose ul{list-style:disc;padding-left:24px}
.prose h2{margin-top:48px}
.prose h3{margin-top:28px}
.prose a,.text-link{color:var(--c-accent-dark);text-decoration:underline;text-underline-offset:4px}
.prose li+li{margin-top:8px}
.muted{color:var(--c-muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.card,.panel{min-width:0;padding:24px;border:1px solid var(--c-border);border-radius:var(--r-lg);background:var(--c-panel);box-shadow:var(--shadow-card)}
.panel{background:var(--c-panel-2);box-shadow:inset 0 1px 0 var(--c-panel)}
.card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.card-grid>*{min-width:0}
.btns{display:flex;gap:10px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;height:46px;padding:0 22px;border-radius:var(--r-pill);font-size:var(--fs-button);font-weight:var(--weight-medium);flex-shrink:0;white-space:nowrap;transition:transform .15s var(--ease-ui),box-shadow .15s var(--ease-ui)}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn-primary{background:var(--c-ink);color:var(--c-on-ink);box-shadow:var(--shadow-ink)}
.btn-primary .ico{color:var(--c-accent)}
.btn-ghost,.btn-secondary{background:var(--c-panel);color:var(--c-ink);border:1px solid var(--c-border)}
.btn[disabled],.btn[aria-disabled="true"]{background:var(--c-panel-2);color:var(--c-muted);box-shadow:none;cursor:not-allowed;transform:none}
.ico{width:14px;height:14px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.screen{position:relative;overflow-x:clip;max-width:100%;background:linear-gradient(180deg,var(--a-accent-06) 0,var(--c-clear) 620px)}
#site-header{position:relative;z-index:40;min-height:var(--header-height)}
.topbar{position:relative;z-index:41;display:flex;align-items:center;justify-content:space-between;gap:24px;height:var(--header-height)}
.topbar-left{display:flex;align-items:center;gap:28px;min-width:0}
.brand{display:inline-flex;align-items:center;gap:10px;flex-shrink:0;min-height:30px}
.brand-mark{width:30px;height:30px;display:block;flex-shrink:0}
.brand-name{font-family:var(--font-display);font-weight:var(--weight-brand);font-size:var(--fs-lede);letter-spacing:var(--tracking-cjk)}
.brand-zh{color:var(--c-muted);font-weight:var(--weight-medium)}
.desktop-nav{min-width:0}
.nav-list{display:flex;align-items:center;list-style:none;margin:0;padding:4px;gap:2px;background:var(--c-panel);border:1px solid var(--c-border);border-radius:var(--r-pill)}
.nav-list a{display:block;padding:6px 14px;border-radius:var(--r-pill);font-size:var(--fs-nav);color:var(--c-muted);white-space:nowrap;transition:color .15s var(--ease-ui),background-color .15s var(--ease-ui)}
.nav-list a:hover{color:var(--c-ink)}
.nav-list a[aria-current="page"]{background:var(--c-panel-2);color:var(--c-ink);font-weight:var(--weight-medium)}
.topbar-tools{display:flex;align-items:center;gap:8px;margin-left:auto}
.lang-box{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:36px;width:auto;padding:7px 12px;border-radius:var(--r-pill);font-size:var(--fs-nav);color:var(--c-muted);white-space:nowrap}
.lang-caret{font-size:var(--fs-caption)}
.lang-menu{position:absolute;right:0;top:calc(100% + 8px);min-width:180px;padding:6px;background:var(--c-panel);border:1px solid var(--c-border);border-radius:var(--r-md);box-shadow:var(--shadow-card);z-index:8}
.lang-menu a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-xs);font-size:var(--fs-nav)}
.lang-menu a[aria-current="true"]{background:var(--c-panel-2)}
.login{display:inline-flex;align-items:center;justify-content:center;height:36px;padding:0 18px;border-radius:var(--r-pill);background:var(--c-ink);color:var(--c-on-ink);font-size:var(--fs-nav);font-weight:var(--weight-medium);box-shadow:var(--shadow-ink);white-space:nowrap}
.menu-toggle{display:none;min-width:44px;min-height:44px;align-items:center;justify-content:center;border-radius:var(--r-sm);background:var(--c-panel-2)}
.menu-toggle svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round}
.mobile-drawer{display:none;position:fixed;top:var(--header-height);inset-inline:0;z-index:42;background:var(--c-panel);padding:16px var(--gutter) 24px;max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;border-bottom:1px solid var(--c-border)}
.mobile-drawer a{display:flex;width:100%;align-items:center;min-height:44px;padding:12px 16px;border-radius:var(--r-sm)}
.mobile-drawer a[aria-current]{background:var(--c-panel-2)}
.drawer-label{padding:16px;font-size:var(--fs-xs);color:var(--c-muted);font-family:var(--font-mono)}
.nav-veil{position:fixed;inset:var(--header-height) 0 0;z-index:39;background:var(--a-ink-24)}
html.nav-open{overflow:hidden}
.site-footer{margin-top:48px;padding-top:48px;padding-bottom:32px;border-top:1px solid var(--c-border);background:var(--c-panel-2)}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:32px}
.footer-grid>*{min-width:0}
.footer-brand p{margin-top:16px;color:var(--c-muted);font-size:var(--fs-nav);max-width:32ch}
.footer-heading{font-size:var(--fs-nav);font-weight:var(--weight-bold);margin-bottom:12px}
.footer-links{display:grid;gap:4px}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;font-size:var(--fs-nav);color:var(--c-muted)}
.footer-links a:hover{color:var(--c-accent-dark)}
.footer-bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;margin-top:32px;padding-top:20px;border-top:1px solid var(--c-border);font-size:var(--fs-sm);color:var(--c-muted)}
.legal-links{display:flex;flex-wrap:wrap;gap:8px 20px}
.legal-links a{display:inline-flex;align-items:center;min-height:28px}
.reveal{transition:opacity .55s var(--ease-ui),transform .55s var(--ease-ui)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-height:120px;max-width:100%;min-width:0;overflow:hidden;margin-top:24px;margin-bottom:32px}
#server-status>*{min-width:0;max-width:100%}
.decoration-zone{position:relative;overflow-x:clip;max-width:100%}
@media(max-width:1100px){
  .desktop-nav{display:none}
  .topbar-left .nav-list{display:none}
  .menu-toggle{display:inline-flex}
  .topbar-tools{margin-left:auto}
  .mobile-drawer:not([hidden]){display:block}
}
@media(max-width:768px){
  :root{--gutter:16px}
  h1{font-size:var(--fs-mobile-h1)}
  .section{padding-top:48px;padding-bottom:48px}
  .card-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .topbar{gap:12px}
  .topbar-tools{gap:4px;margin-left:auto}
  .lang-box{display:none}
  .btn{height:44px;padding:0 18px}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .tilt,.tilt-card{transform:none}
  .decoration-zone{max-width:100%}
  .footer-grid{grid-template-columns:1fr}
  .card,.panel{padding:20px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}