:root{
  --bg:#FAF4E9;--bg-top:#FDF9F1;--bg-bottom:#F3EAD9;--panel:#FFFDF8;--panel-warm:#FBF6EC;--panel-2:#F1E7D5;--panel-veil:rgba(255,253,248,.72);--border:#E3D6BF;
  --accent:#1A6E5A;--accent-hi:#2B8A71;--accent-dark:#114A3D;--text:#2A2219;--muted:#6E6252;--success:#2F8F5B;--warn:#C98A12;--error:#C2412E;
  --lime-glow:#DCE77F;--mark-green:rgba(26,110,90,.14);--violet-ink:#5149B8;
  --ink-green:#134F42;--ink-green-hi:#1F6B59;--ink-green-low:#0E3E34;--ink-green-block:#0F4337;
  --mist:#B9B4F0;--mist-hi:#D3CFF7;--mist-low:#A49EE6;--mist-block:#ACA6EC;
  --lime:#E3EC9A;--lime-hi:#F0F4C4;--lime-low:#D5E07F;--lime-block:#D9E38B;
  --paper-deep:#EFE3CC;--paper-deep-hi:#F6EEDF;--paper-deep-low:#E6D5B7;--paper-deep-block:#E7D8BC;
  --grid-dark:rgba(255,253,248,.07);--grid-light:rgba(42,34,25,.035);
  --frame-dark:rgba(255,253,248,.15);--frame-dark-edge:rgba(255,253,248,.3);--frame-light:rgba(255,253,248,.46);--frame-light-edge:rgba(255,253,248,.78);
  --gleam:rgba(255,255,255,.95);--pop-edge:rgba(227,214,191,.7);
  --shadow-green-10:rgba(26,110,90,.10);--shadow-green-12:rgba(26,110,90,.12);--shadow-green-18:rgba(26,110,90,.18);--shadow-ink:rgba(8,40,33,.45);--cta-glow:rgba(26,110,90,.38);--cta-inner:rgba(255,255,255,.18);--veil:rgba(42,34,25,.3);
  --flag-red:#D52B1E;--flag-blue:#22397A;--flag-white:#FFFFFF;--flag-edge:rgba(42,34,25,.18);
  --radius-btn:8px;--radius-sm:6px;--radius-card:16px;--radius-candy:20px;--radius-pill:999px;--radius-focus:4px;--radius-pop:12px;--radius-shell:18px;--radius-round:50%;
  --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,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --fs-xs:12px;--fs-small:13px;--fs-label:14px;--fs-body:16px;--fs-button:17px;--fs-lead:18px;--fs-sub:20px;--fs-h3:24px;--fs-h2:32px;--fs-brand:19px;--fs-display:clamp(40px,4.8vw,68px);--fs-mobile-display:40px;
  --weight-normal:400;--weight-medium:500;--weight-semibold:600;--weight-bold:700;--weight-heavy:800;--weight-display:900;
  --gutter:24px;--page-width:1248px;--header-height:64px;--anchor-offset:80px;--toc-offset:144px;--section-space:64px;--ease: .2s ease;--reveal-duration:.35s;
  --shadow-card:0 30px 60px -28px var(--shadow-green-10),0 2px 6px -2px var(--shadow-green-10);
  --grain:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 .16 0 0 0 0 .13 0 0 0 0 .1 0 0 0 1.2 -.35'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}
*,*::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(--bg);color:var(--text);font-family:var(--font-body);font-size:var(--fs-body);line-height:1.6;-webkit-font-smoothing:antialiased}
body::after{content:"";position:fixed;inset:0;background:var(--grain);opacity:.1;pointer-events:none;z-index:50}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button,a,summary{-webkit-tap-highlight-color:var(--mark-green)}
button{border:0}
img{max-width:100%;height:auto}
svg{flex-shrink:0}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--radius-focus)}
[hidden]{display:none!important}
h1,h2,h3{font-family:var(--font-display);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--fs-display);font-weight:var(--weight-display);line-height:1.1;letter-spacing:-.02em}
h2{font-size:var(--fs-h2);line-height:1.25;letter-spacing:-.02em;font-weight:var(--weight-display)}
h3{font-size:var(--fs-h3);line-height:1.35}
p{margin-top:0}
code{font-family:var(--font-mono);overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;background:var(--panel-2);padding:24px;border:1px solid var(--border);border-radius:var(--radius-card)}
pre code{overflow-wrap:normal;white-space:pre}
main,section,article,aside,nav,div,li{min-width:0}
.no-break{white-space:nowrap}
.wrap{width:100%;max-width:var(--page-width);margin-inline:auto;padding-inline:var(--gutter)}
.sec{padding-top:var(--section-space);padding-bottom:var(--section-space)}
.prose{max-width:800px;overflow-wrap:break-word}
.reading-wrap>.prose{margin-inline:auto}
.prose p,.prose li{line-height:1.85}
.prose a{text-decoration:underline;text-underline-offset:3px;color:var(--accent-dark)}
.prose h2{margin-top:48px}
.prose h3{margin-top:32px}
.muted{color:var(--muted)}
.eyebrow{margin:0 0 8px;font-size:var(--fs-small);font-weight:var(--weight-bold);color:var(--accent);letter-spacing:.04em}
.section-title{margin:0 0 16px}
.lead{font-size:var(--fs-lead);color:var(--muted)}
.skip{position:absolute;left:16px;top:-64px;z-index:100;padding:8px 14px;border-radius:var(--radius-btn);background:var(--text);color:var(--panel);font-size:var(--fs-label)}
.skip:focus{top:12px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.stage{position:relative;overflow-x:clip;max-width:100%;background:linear-gradient(180deg,var(--bg-top) 0%,var(--bg) 46%,var(--bg-bottom) 100%)}
.top{position:relative;z-index:80;border-bottom:1px solid var(--border)}
.top__inner{height:var(--header-height);display:flex;align-items:center;gap:24px;flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:10px;flex:none}
.brand__mark{width:34px;height:34px;flex:none}
.brand__en{font-family:var(--font-display);font-weight:var(--weight-display);font-size:var(--fs-brand);letter-spacing:-.02em}
.brand__zh{font-size:var(--fs-label);font-weight:var(--weight-medium);color:var(--muted)}
.nav{flex:1;display:flex;justify-content:center;min-width:0}
.nav__list{display:flex;align-items:center;gap:2px;margin:0;padding:0;list-style:none;border-radius:var(--radius-pill);background:var(--panel-veil);border:1px solid var(--border)}
.nav__link{display:block;padding:10px 14px;border-radius:var(--radius-pill);font-size:var(--fs-label);font-weight:var(--weight-medium);line-height:22px;color:var(--muted);white-space:nowrap;transition:color var(--ease),background-color var(--ease)}
.nav__link:hover{color:var(--text);background:var(--panel-2)}
.nav__link[aria-current="page"]{background:var(--text);color:var(--panel);font-weight:var(--weight-bold)}
.top__acts{display:flex;align-items:center;gap:10px;flex-shrink:0}
.lang-picker{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;height:36px;width:auto;min-width:44px;padding:0 10px;border:0;background:none;border-radius:var(--radius-btn);font:inherit;font-size:var(--fs-label);color:var(--muted);cursor:pointer}
.lang span{white-space:nowrap}
.lang:hover{color:var(--text);background:var(--panel-2)}
.lang svg{width:16px;height:16px}
.lang-panel{position:absolute;right:0;top:calc(100% + 10px);z-index:100;width:max-content;min-width:160px;padding:8px;background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-pop);box-shadow:var(--shadow-card)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--radius-btn);font-size:var(--fs-label)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--panel-2);color:var(--accent-dark)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;height:36px;padding:0 18px;border:1px solid var(--text);border-radius:var(--radius-btn);background:var(--panel);font-size:var(--fs-label);font-weight:var(--weight-bold);white-space:nowrap;transition:background-color var(--ease)}
.btn-login:hover{background:var(--panel-2)}
.menu-toggle{display:none;min-width:44px;min-height:44px;align-items:center;justify-content:center;flex-direction:column;gap:5px;background:var(--panel);color:var(--accent-dark);border:1px solid var(--border);border-radius:var(--radius-btn)}
.menu-line{display:block;width:20px;height:2px;background:currentColor}
.mobile-drawer{position:fixed;z-index:75;top:var(--header-height);right:0;width:min(420px,100%);height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;background:var(--panel);padding:16px var(--gutter) 32px;border-left:1px solid var(--border)}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;border-radius:var(--radius-btn)}
.mobile-drawer a:hover,.mobile-drawer a[aria-current="page"]{background:var(--panel-2);color:var(--accent-dark)}
.drawer-label{margin:20px 16px 8px;font-size:var(--fs-small);color:var(--muted)}
.menu-veil{position:fixed;z-index:70;inset:var(--header-height) 0 0;background:var(--veil)}
html.nav-open{overflow:hidden}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:52px;padding:12px 28px;border:1px solid transparent;border-radius:var(--radius-btn);font-size:var(--fs-button);font-weight:var(--weight-bold);line-height:1.25;white-space:nowrap;flex-shrink:0;transition:background-color var(--ease),transform var(--ease)}
.btn svg{width:18px;height:18px}
.btn--primary,.btn-primary{background:var(--accent);color:var(--panel);box-shadow:inset 0 1px 0 var(--cta-inner),0 12px 26px -12px var(--cta-glow)}
.prose .btn--primary,.article-body .btn--primary{color:var(--panel)}
.btn--primary:hover,.btn-primary:hover{background:var(--accent-dark)}
.btn--primary:active,.btn-primary:active{transform:translateY(1px)}
.btn--ghost{background:var(--panel);color:var(--text);border:1px solid var(--text);font-weight:var(--weight-semibold)}
.btn--ghost:hover{background:var(--panel-2)}
.btn--ghost svg{color:var(--accent)}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--panel-2);color:var(--muted);box-shadow:none;cursor:not-allowed}
.btn-xs{display:inline-flex;align-items:center;justify-content:center;min-height:26px;padding:3px 12px;border-radius:var(--radius-sm);background:var(--accent);color:var(--panel);font-size:var(--fs-small);font-weight:var(--weight-bold);white-space:nowrap}
.btn-xs:hover{background:var(--accent-dark)}
.btn-txt{display:inline-flex;align-items:center;justify-content:center;min-height:26px;padding:3px 0;font-size:var(--fs-small);font-weight:var(--weight-semibold);color:var(--muted);background:none}
.btn-txt:hover{color:var(--accent-dark)}
.ctas{display:flex;justify-content:center;flex-wrap:wrap;gap:16px;margin-bottom:14px}
.panel,.card{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-card);padding:24px;box-shadow:var(--shadow-card)}
.panel--inset{background:var(--panel-2);box-shadow:inset 0 1px 0 var(--gleam)}
.card-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.badge{display:inline-flex;align-items:center;gap:8px;min-height:28px;margin:0 0 16px;padding:3px 14px 3px 10px;border-radius:var(--radius-pill);background:var(--panel);border:1px solid var(--border);font-size:var(--fs-small);font-weight:var(--weight-semibold);color:var(--muted);max-width:100%;overflow-wrap:anywhere}
.badge__dot{width:8px;height:8px;flex-shrink:0;border-radius:var(--radius-round);background:var(--accent);box-shadow:0 0 0 3px var(--mark-green)}
.badge b{font-family:var(--font-mono);font-weight:var(--weight-semibold);color:var(--text);font-size:var(--fs-xs)}
.reveal{transition:opacity var(--reveal-duration) ease,transform var(--reveal-duration) ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:static;display:block;max-width:100%;min-height:80px;overflow:hidden;margin-top:24px;margin-bottom:32px}
#server-status>*{min-width:0;max-width:100%}
.footer{border-top:1px solid var(--border);background:var(--panel-2);padding-top:48px;padding-bottom:24px}
.footer__grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:40px}
.footer__intro{max-width:340px;margin:16px 0;color:var(--muted);font-size:var(--fs-label)}
.footer__title{margin:0 0 12px;font-size:var(--fs-label);font-weight:var(--weight-bold)}
.footer__links{display:flex;flex-wrap:wrap;gap:4px 16px;list-style:none;margin:0;padding:0}
.footer__links a{display:inline-flex;align-items:center;min-height:32px;font-size:var(--fs-label);color:var(--muted)}
.footer__links a:hover{color:var(--accent-dark);text-decoration:underline}
.footer__bottom{margin-top:32px;padding-top:20px;border-top:1px solid var(--border);display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;font-size:var(--fs-small);color:var(--muted)}
@media(min-width:961px){.mobile-drawer,.menu-veil{display:none!important}}
@media(max-width:1100px){.brand__zh{display:none}.nav__link{padding-inline:10px}.top__inner{gap:16px}}
@media(max-width:960px){.nav{display:none}.top__acts{margin-left:auto}.menu-toggle{display:inline-flex}.top__inner{gap:12px}.card-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:768px){h1{font-size:var(--fs-mobile-display)}.btn{min-height:48px;padding:12px 22px;font-size:var(--fs-body)}.footer__grid{grid-template-columns:1fr 1fr}.footer__grid>:first-child{grid-column:1/-1}}
@media(max-width:640px){
  :root{--gutter:16px;--section-space:40px;--fs-h2:26px;--fs-h3:21px}
  .no-break{white-space:normal}.tilt,[data-tilt]{transform:none!important}
  .stage,.decoration-zone{max-width:100%;overflow-x:clip}
  .top__inner{gap:8px}.brand{gap:6px}.brand__mark{width:28px;height:28px}.brand__en{font-size:var(--fs-body)}
  .top__acts{gap:4px;margin-left:auto}.lang{font-size:var(--fs-xs);padding-inline:5px;gap:4px}.lang svg{width:14px;height:14px}.btn-login{padding-inline:10px;font-size:var(--fs-small)}
  .card-grid,.footer__grid{grid-template-columns:minmax(0,1fr)}.panel,.card{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}
}