:root{
  --bg:#FAF3E7;--bg-panel:#FFFCF6;--bg-panel-2:#F2E7D5;--border:#E6D7BF;
  --accent:#C93A6E;--accent-dark:#982550;--coral:#E8785A;
  --text:#2A1F17;--text-muted:#6E5E4F;--ink:#221912;--on-ink:#FFF8EE;
  --success:#2E9D5B;--warn:#D98A12;--error:#B8321F;--white:#FFFFFF;
  --sky-top:#F7D9BE;--sky-mid:#FBEBDD;--cloud:rgba(255,249,240,.96);--cloud-clear:rgba(255,249,240,0);
  --accent-0:rgba(201,58,110,0);--accent-10:rgba(201,58,110,.10);--accent-12:rgba(201,58,110,.12);--accent-18:rgba(201,58,110,.18);
  --ink-06:rgba(42,31,23,.06);--ink-10:rgba(42,31,23,.10);--ink-18:rgba(42,31,23,.18);--ink-30:rgba(34,25,18,.30);
  --hi-line:rgba(255,255,255,.85);--hi-soft:rgba(255,255,255,.55);--hi-ink:rgba(255,255,255,.16);
  --glass:rgba(255,252,246,.72);--glass-weak:rgba(255,252,246,.42);--glare:rgba(255,255,255,.24);--glare-0:rgba(255,255,255,0);
  --success-12:rgba(46,157,91,.12);
  --alu-1:#F2EBE0;--alu-2:#D9CDBC;--alu-3:#BBAD99;--alu-4:#9E907D;--bezel:#1D1611;--bezel-2:#30271F;
  --candy-peach-1:#FDE6D3;--candy-peach-2:#F6C6A3;--candy-mint-1:#E0F2E6;--candy-mint-2:#BCE0C9;
  --candy-sky-1:#E2EEF8;--candy-sky-2:#BCD5EB;--candy-yellow-1:#FFF4CC;--candy-yellow-2:#F0DDA4;
  --candy-pink-1:#F9E3EA;--candy-pink-2:#EBC4D0;
  --flag-red:#D52B3A;--flag-white:#FFFFFF;--flag-blue:#1E3A8A;--flag-edge:rgba(42,31,23,.16);
  --r-pill:999px;--r-xl:28px;--r-lg:24px;--r-md:16px;--r-sm:10px;--r-xs:6px;--r-round:50%;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Apple SD Gothic Neo","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Malgun Gothic","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;
  --size-body:16px;--size-small:14px;--size-tiny:12px;--size-lead:20px;
  --size-h1:clamp(52px,5vw,68px);--size-h2:clamp(28px,3.2vw,40px);--size-h3:24px;
  --line-body:1.6;--line-heading:1.15;--tracking-heading:-.02em;
  --gutter:24px;--content-width:1200px;--reading-width:800px;--header-height:68px;--anchor-offset:84px;--toc-offset:144px;
  --space-1:4px;--space-2:8px;--space-3:12px;--space-4:16px;--space-5:24px;--space-6:32px;--space-7:48px;--space-8:64px;--space-9:88px;
  --ease:ease;--duration:.2s;--reveal-duration:.35s;--focus-width:2px;
  --shadow-float:inset 0 0 0 1px var(--hi-line),0 22px 44px -18px var(--accent-18),0 3px 8px var(--ink-06);
  --shadow-lift:inset 0 1px 0 var(--hi-line),inset 0 12px 10px -10px var(--ink-10),0 16px 30px -14px var(--accent-18),0 2px 4px var(--ink-06);
  --shadow-panel:inset 0 1px 0 var(--hi-line),0 24px 56px -24px var(--accent-12);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:var(--anchor-offset)}
body{margin:0;background:var(--bg);color:var(--text);font:var(--weight-normal) var(--size-body)/var(--line-body) var(--font-body);-webkit-font-smoothing:antialiased}
[hidden]{display:none!important}
a{color:inherit;text-underline-offset:3px}
button,input,select,textarea{font:inherit}
button{color:inherit;cursor:pointer}
button,select,input,textarea{max-width:100%}
img{max-width:100%;height:auto;display:block}
svg{flex-shrink:0}
h1,h2,h3{font-family:var(--font-display);line-height:var(--line-heading);letter-spacing:var(--tracking-heading);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--size-h1);font-weight:var(--weight-display)}
h2{font-size:var(--size-h2);font-weight:var(--weight-display)}
h3{font-size:var(--size-h3);font-weight:var(--weight-heavy)}
p{margin-top:0}
code{font-family:var(--font-mono);overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:var(--space-5);border-radius:var(--r-md);background:var(--bg-panel-2)}
pre code{white-space:pre;overflow-wrap:normal}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:var(--focus-width) solid var(--accent-dark);outline-offset:3px}
.no-break{white-space:nowrap}
.wrap{width:100%;max-width:var(--content-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:var(--space-8);padding-bottom:var(--space-8)}
.grid{display:grid;gap:var(--space-5)}
.grid>*{min-width:0}
.grid--three{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--five{grid-template-columns:repeat(5,minmax(0,1fr))}
.stack>*+*{margin-top:var(--space-5)}
.panel,.card{min-width:0;padding:var(--space-6);border-radius:var(--r-xl);background:var(--bg-panel);box-shadow:var(--shadow-panel)}
.panel--inset{background:var(--bg-panel-2)}
.muted{color:var(--text-muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.section-head{text-align:center;max-width:760px;margin:0 auto var(--space-7)}
.section-head h2{margin:0 0 var(--space-4)}
.section-head p{color:var(--text-muted);font-size:18px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:50px;padding:12px 30px;border:0;border-radius:var(--r-pill);font:var(--weight-semibold) 16px/1.4 var(--font-body);text-decoration:none;transition:transform var(--duration) var(--ease),box-shadow var(--duration) var(--ease);flex-shrink:0;white-space:nowrap}
.btn svg{width:16px;height:16px}
.btn--solid,.btn-primary{background:var(--ink);color:var(--on-ink);box-shadow:inset 0 1px 0 var(--hi-ink),0 14px 28px -14px var(--ink-30),0 12px 32px -16px var(--accent-18)}
.btn--line,.btn-secondary{background:var(--bg-panel);color:var(--text);box-shadow:inset 0 0 0 1.5px var(--ink),0 12px 26px -18px var(--accent-18)}
.btn--small{min-height:40px;padding:8px 20px;font-size:var(--size-small)}
.btn:hover{transform:translateY(-2px)}
.btn:active{transform:translateY(0)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.5;cursor:not-allowed;transform:none}
.btn[aria-disabled="true"]{pointer-events:none}
.icon-button{width:44px;height:44px;display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;border:0;border-radius:var(--r-round);background:var(--bg-panel-2)}
.icon-button svg{width:20px;height:20px}
.reveal{transition:opacity var(--reveal-duration) var(--ease),transform var(--reveal-duration) var(--ease)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-height:80px;max-width:100%;overflow:hidden;margin-block:var(--space-5)}
#server-status+*{margin-top:var(--space-6)}
#server-status :where(.grid,ul){min-width:0;max-width:100%}
.paper-grain{position:fixed;inset:0;width:100%;height:100%;pointer-events:none;z-index:100;opacity:.03;mix-blend-mode:multiply}
.grain-ink{flood-color:var(--text)}
.svg-defs{position:absolute;width:0;height:0;overflow:hidden}
.f-red{fill:var(--flag-red)}.f-white{fill:var(--flag-white)}.f-blue{fill:var(--flag-blue)}
.s-white{stroke:var(--flag-white);fill:none}.s-red{stroke:var(--flag-red);fill:none}
.f-edge{fill:none;stroke:var(--flag-edge);stroke-width:.8}
.st-accent{stop-color:var(--accent)}.st-coral{stop-color:var(--coral)}
.s-paper{stroke:var(--bg-panel)}.f-paper{fill:var(--bg-panel)}.f-mint{fill:var(--candy-mint-1)}
.daybreak{position:relative;overflow-x:clip;max-width:100%;background:linear-gradient(180deg,var(--sky-top) 0%,var(--sky-mid) 52%,var(--bg) 97%)}
.sky{position:absolute;inset:0;pointer-events:none;z-index:0}
.cloud{position:absolute;filter:blur(16px)}
.cloud--sw{inset:auto 58% 3% -12%;height:44%;background:radial-gradient(46% 52% at 36% 62%,var(--cloud) 0%,var(--cloud-clear) 100%),radial-gradient(32% 40% at 66% 46%,var(--cloud) 0%,var(--cloud-clear) 100%),radial-gradient(28% 30% at 18% 40%,var(--cloud) 0%,var(--cloud-clear) 100%)}
.cloud--ne{inset:5% -10% auto 62%;height:38%;background:radial-gradient(44% 50% at 58% 46%,var(--cloud) 0%,var(--cloud-clear) 100%),radial-gradient(30% 38% at 30% 60%,var(--cloud) 0%,var(--cloud-clear) 100%),radial-gradient(26% 28% at 82% 66%,var(--cloud) 0%,var(--cloud-clear) 100%)}
.topbar{position:relative;z-index:50}
.topbar__inner{max-width:1320px;margin:0 auto;padding:0 40px;height:var(--header-height);display:flex;align-items:center;gap:24px;flex-wrap:nowrap}
.brandmark{display:inline-flex;align-items:center;gap:10px;flex:none;text-decoration:none;color:var(--text);font-family:var(--font-display);font-weight:var(--weight-heavy);font-size:20px;letter-spacing:-.02em;line-height:1}
.brandmark img{width:30px;height:30px;flex:none;filter:drop-shadow(0 4px 8px var(--accent-18))}
.brandmark__zh{font-weight:var(--weight-medium);color:var(--text-muted)}
.mainnav{flex:1;display:flex;justify-content:center;min-width:0}
.mainnav>ul{list-style:none;margin:0;padding:0;display:flex;align-items:center;gap:2px;border-radius:var(--r-pill);background:var(--glass-weak);box-shadow:inset 0 0 0 1px var(--hi-soft)}
.mainnav li{padding-block:4px}
.nav-more{position:relative}
.nav-more__toggle{padding:7px 11px;border:0;border-radius:var(--r-pill);background:transparent;font-size:14px;line-height:20px;white-space:nowrap;cursor:pointer;color:var(--text-muted)}
.mainnav .nav-more__panel{position:absolute;right:0;top:100%;min-width:220px;list-style:none;margin:0;padding:8px;border-radius:var(--r-md);background:var(--bg-panel);box-shadow:var(--shadow-float);z-index:60}
.mainnav .nav-more__panel a{white-space:normal}
.mainnav a{display:block;padding:7px 11px;border-radius:var(--r-pill);font-size:14px;line-height:20px;color:var(--text-muted);text-decoration:none;white-space:nowrap;transition:color var(--duration) var(--ease),background-color var(--duration) var(--ease)}
.mainnav a:hover{color:var(--text);background:var(--glass)}
.mainnav a[aria-current="page"]{background:var(--accent-12);color:var(--accent-dark);font-weight:var(--weight-semibold)}
.topbar__tools{display:flex;align-items:center;gap:10px;flex-shrink:0;position:relative;z-index:4}
.language{position:relative}
.langpick{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;height:38px;padding:0 10px;border:0;border-radius:var(--r-pill);background:transparent;color:var(--text-muted);font:var(--weight-medium) 14px/1 var(--font-body);cursor:pointer}
.langpick span{white-space:nowrap}
.langpick:hover{color:var(--text);background:var(--glass-weak)}
.langpick svg{width:16px;height:16px;flex:none}
.language__panel{position:absolute;right:0;top:calc(100% + 10px);z-index:60;min-width:180px;padding:8px;border-radius:var(--r-md);background:var(--bg-panel);box-shadow:var(--shadow-float)}
.language__panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-sm);text-decoration:none;white-space:nowrap}
.language__panel a:hover,.language__panel a[aria-current="true"]{background:var(--bg-panel-2)}
.login-btn{display:inline-flex;align-items:center;justify-content:center;height:38px;padding:0 20px;border-radius:var(--r-pill);background:var(--ink);color:var(--on-ink);font-size:14px;font-weight:var(--weight-semibold);text-decoration:none;white-space:nowrap;box-shadow:inset 0 1px 0 var(--hi-ink),0 8px 18px -10px var(--ink-30);transition:transform var(--duration) var(--ease)}
.login-btn:hover{transform:translateY(-1px)}
.menu-toggle{display:none;min-width:44px;min-height:44px;align-items:center;justify-content:center;border:0;border-radius:var(--r-pill);background:var(--bg-panel-2);color:var(--text)}
.menu-toggle svg{width:20px;height:20px}
.menu-drawer{display:none;position:fixed;inset:var(--header-height) 0 auto;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;background:var(--bg-panel);padding:var(--space-5);z-index:3}
.menu-drawer ul{list-style:none;margin:0;padding:0}
.menu-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;text-decoration:none;border-radius:var(--r-sm)}
.menu-drawer a[aria-current="page"]{background:var(--accent-12);color:var(--accent-dark)}
.menu-drawer a:hover{background:var(--bg-panel-2)}
.menu-drawer__languages{margin-top:var(--space-5);padding-top:var(--space-4);border-top:1px solid var(--border)}
.menu-drawer__languages a[aria-current="true"]{font-weight:var(--weight-bold)}
.menu-veil{position:fixed;inset:var(--header-height) 0 0;background:var(--ink-30);border:0;z-index:2}
html.nav-open{overflow:hidden}
.site-footer{position:relative;background:var(--bg-panel-2);border-top:1px solid var(--hi-line);padding-top:var(--space-8);padding-bottom:var(--space-6)}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:var(--space-7)}
.footer-grid>*{min-width:0}
.footer-brand p{max-width:360px;margin-top:var(--space-5);color:var(--text-muted)}
.footer-heading{font-size:16px;font-weight:var(--weight-bold);margin:0 0 var(--space-4)}
.footer-links{list-style:none;margin:0;padding:0;display:flex;flex-wrap:wrap;gap:8px 16px}
.footer-links li{min-width:0}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;text-decoration:none;font-size:14px;overflow-wrap:anywhere}
.footer-links a:hover{text-decoration:underline}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:var(--space-6)}
.footer-languages a{display:inline-flex;align-items:center;min-height:28px;font-size:14px}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:var(--space-4);margin-top:var(--space-6);padding-top:var(--space-5);border-top:1px solid var(--border);font-size:14px;color:var(--text-muted)}
.prose{min-width:0;overflow-wrap:break-word}
.prose h2{margin-top:var(--space-7)}
.prose h3{margin-top:var(--space-6)}
.prose p,.prose li{line-height:1.85}
.prose img{border-radius:var(--r-md)}
.prose blockquote{margin-inline:0;padding:var(--space-5);background:var(--bg-panel-2);border-left:4px solid var(--text-muted);border-radius:var(--r-sm)}
@media(max-width:1240px){
  .topbar__inner{padding-inline:24px;gap:14px}
  .mainnav a{padding-inline:8px;font-size:13px}
  .topbar__tools{gap:6px}
}
@media(max-width:1100px){
  .mainnav{display:none}
  .topbar__tools{margin-left:auto}
  .menu-toggle{display:inline-flex}
  .menu-drawer:not([hidden]){display:block}
}
@media(max-width:768px){
  :root{--size-h1:clamp(28px,6vw,40px);--gutter:20px;--space-8:48px;--space-9:64px}
  .grid--three{grid-template-columns:1fr}
  .grid--five{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1fr;gap:var(--space-6)}
  .cloud{max-width:100%}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .topbar__inner{padding-inline:16px;gap:8px}
  .brandmark{font-size:16px;gap:6px}
  .brandmark img{width:24px;height:24px}
  .topbar__tools{margin-left:auto;gap:4px}
  .langpick{font-size:11px;padding-inline:4px;gap:3px}
  .langpick svg{width:13px;height:13px}
  .login-btn{padding-inline:12px;font-size:12px}
  .panel,.card{padding:var(--space-5)}
  .tilt,.decorative-tilt,[data-tilt]{transform:none}
  .btn{padding-inline:22px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:0s!important;animation:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}