:root{
  --bg:#E7EEF2;--bg-top:#F1F5F8;--bg-bottom:#E1EAF0;--panel:#F7FAFC;--panel-2:#DAE4EB;--border:#C9D6DF;
  --accent:#17463A;--accent-2:#2A6A57;--accent-dark:#0F3329;--apricot:#F6E3CF;--text:#13252B;--muted:#4E6168;--success:#2E8B57;--warn:#C98A1B;--error:#C0392B;--on-accent:#FFFFFF;--white:#FFFFFF;
  --arc:#9DC3B5;--atmo:rgba(23,70,58,.045);--accent-tint:rgba(23,70,58,.07);--accent-line:rgba(23,70,58,.16);--accent-ring:rgba(23,70,58,.14);--line-soft:rgba(19,37,43,.08);
  --nav-bg:rgba(247,250,252,.84);--ghost-hover:rgba(255,255,255,.6);--hl-top:rgba(255,255,255,.95);--hl-edge:rgba(255,255,255,.6);--hl-cta:rgba(255,255,255,.18);--edge-light:rgba(255,255,255,.42);--edge-top:rgba(255,255,255,.55);--tile-hl:rgba(255,255,255,.7);--disc-ring:rgba(19,37,43,.14);--veil:rgba(19,37,43,.28);
  --shadow-card:0 26px 54px -14px rgba(23,70,58,.14),0 8px 18px -8px rgba(23,70,58,.12);
  --shadow-ui:0 22px 48px -16px rgba(23,70,58,.13),0 4px 12px -6px rgba(23,70,58,.10);
  --shadow-tag:0 14px 30px -12px rgba(23,70,58,.14),0 2px 6px -2px rgba(23,70,58,.10);
  --shadow-cta:0 16px 30px -14px rgba(23,70,58,.45);--shadow-chip:0 6px 14px -6px rgba(15,51,41,.32);
  --shadow-dock:0 18px 36px -14px rgba(23,70,58,.30),0 4px 10px -4px rgba(23,70,58,.14);
  --flag-red:#C8352B;--flag-blue:#24406E;--flag-white:#FFFFFF;--flag-edge:rgba(19,37,43,.18);
  --dusk-1:#1D3E4A;--dusk-2:#3A6874;--dusk-3:#93B3B1;--dusk-water-1:#2D5560;--dusk-water-2:#14323C;--dusk-far:#55818A;--dusk-near:#2E5864;--dusk-bld-1:#0F2C35;--dusk-bld-2:#1B4551;--dusk-haze:rgba(246,227,207,.22);--dusk-glow:rgba(246,227,207,.58);
  --dawn-1:#9DB3C1;--dawn-2:#C7D5DD;--dawn-3:#EBF0F2;--dawn-water-1:#A7BAC5;--dawn-water-2:#7A92A0;--dawn-far:#A3B6C2;--dawn-near:#8BA1AE;--dawn-fuji:#8FA6B4;--dawn-bld-1:#4C6573;--dawn-bld-2:#647D8B;--dawn-haze:rgba(255,255,255,.35);--dawn-glow:rgba(255,255,255,.72);--snow:#F4F7F9;--sun:rgba(255,255,255,.82);--shimmer:rgba(246,227,207,.55);--glint:rgba(255,255,255,.5);
  --font-display:Georgia,'Times New Roman','Songti SC','STSong','Noto Serif SC','SimSun',serif;
  --font-body:'Inter','Noto Sans SC','Noto Sans JP','Noto Sans KR',-apple-system,'PingFang SC','Microsoft YaHei',sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,'SFMono-Regular',Menlo,Consolas,monospace;
  --r-sm:10px;--r-md:12px;--r-lg:14px;--r-pill:999px;--r-round:50%;
  --gutter:24px;--wrap:1200px;--header-height:72px;--anchor-offset:88px;--toc-offset:152px;
  --text-xs:12px;--text-sm:14px;--text-body:16px;--text-lead:20px;--text-h1:68px;--text-h2:40px;--text-h3:28px;
  --weight-body:400;--weight-medium:550;--weight-strong:650;--tracking-tight:-.02em;
  --space-1:8px;--space-2:16px;--space-3:24px;--space-4:32px;--space-5:40px;--space-6:48px;--space-8:64px;--space-12:96px;
  --ease-out:cubic-bezier(.2,.7,.2,1);--time-fast:.2s;--time-reveal:.35s;
}
*,*::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(--text-body);line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
[hidden]{display:none!important}
img{display:block;max-width:100%;height:auto}
svg{vertical-align:middle;flex-shrink:0}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button:disabled{cursor:not-allowed}
:where(a,button,summary,input,select,textarea,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px}
p{margin:0 0 var(--space-2)}
ul,ol{padding-left:var(--space-3)}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:var(--weight-body);line-height:1.2;letter-spacing:var(--tracking-tight);text-wrap:balance;margin:0 0 var(--space-3);overflow-wrap:break-word}
h1{font-size:clamp(52px,5vw,68px);line-height:1.1}
h2{font-size:var(--text-h2)}
h3{font-size:var(--text-h3)}
h4{font-size:var(--text-lead)}
code,kbd,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere;font-size:.9em}
pre{max-width:100%;overflow-x:auto;padding:var(--space-3);background:var(--panel-2);border:1px solid var(--border);border-radius:var(--r-sm)}
pre code{overflow-wrap:normal;white-space:pre}
table{border-collapse:collapse}
.no-break{white-space:nowrap}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.kw{color:var(--accent)}
.muted{color:var(--muted)}
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:var(--space-12);padding-bottom:var(--space-12)}
.section-head{max-width:720px;margin-bottom:var(--space-6)}
.section-head p{color:var(--muted)}
.grid{display:grid;gap:var(--space-3)}
.grid--two{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--three{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid>*{min-width:0}
.panel,.card{min-width:0;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-lg);box-shadow:inset 0 1px 0 var(--hl-top),var(--shadow-ui);padding:var(--space-4)}
.panel--inset{background:var(--panel-2);box-shadow:inset 0 1px 0 var(--hl-edge)}
.prose{max-width:800px}
.prose p,.prose li{line-height:1.85;overflow-wrap:break-word}
.prose h2{margin-top:var(--space-8)}
.prose h3{margin-top:var(--space-5)}
.prose a:not(.btn){color:var(--accent);text-decoration:underline;text-underline-offset:4px}
.prose img{border-radius:var(--r-md)}
.ico{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;height:52px;max-width:100%;padding:0 30px;border:0;border-radius:var(--r-pill);font-size:var(--text-body);font-weight:var(--weight-medium);white-space:nowrap;flex-shrink:0;transition:background-color var(--time-fast),box-shadow var(--time-fast),transform var(--time-fast)}
.btn .ico{width:18px;height:18px}
.btn--ghost,.btn-secondary{border:1.5px solid var(--text);color:var(--text);background:transparent}
.btn--ghost:hover,.btn-secondary:hover{background:var(--ghost-hover)}
.btn--solid,.btn-primary{color:var(--on-accent);background:linear-gradient(180deg,var(--accent-2),var(--accent) 55%,var(--accent));box-shadow:inset 0 1px 0 var(--hl-cta),var(--shadow-cta)}
.btn--solid:hover,.btn-primary:hover{background:linear-gradient(180deg,var(--accent),var(--accent-dark));transform:translateY(-1px)}
.btn--small{height:44px;padding-inline:var(--space-3);font-size:var(--text-sm)}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--panel-2);color:var(--muted);box-shadow:none;transform:none;pointer-events:none}
.cta-row{display:flex;justify-content:center;align-items:center;gap:16px;flex-wrap:wrap;margin-top:32px}
.reveal{transition:opacity var(--time-reveal) var(--ease-out),transform var(--time-reveal) var(--ease-out)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
.decor-zone{position:relative;overflow-x:clip}
#server-status{display:block;position:relative;min-height:80px;max-width:100%;overflow:hidden;margin-block:var(--space-4)}
#server-status+*{margin-top:var(--space-4)}
#server-status :where(.grid,[class*="grid"]){min-width:0;max-width:100%}
.topbar{position:sticky;top:0;z-index:100;min-height:var(--header-height)}
.topbar__surface{position:relative;z-index:103;background:var(--nav-bg);-webkit-backdrop-filter:saturate(1.2) blur(12px);backdrop-filter:saturate(1.2) blur(12px);border-bottom:1px solid var(--line-soft)}
.topbar__in{max-width:1360px;min-height:var(--header-height);margin:0 auto;padding:0 40px;display:flex;align-items:center;gap:24px;flex-wrap:nowrap}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0;min-height:44px}
.brand__mark{display:block;width:32px;height:32px}
.brand__word{font-size:19px;font-weight:var(--weight-strong);letter-spacing:-.01em;color:var(--text);white-space:nowrap}
.brand__zh{font-size:var(--text-sm);font-weight:var(--weight-body);color:var(--muted)}
.desktop-nav{flex:1;min-width:0}
.menu{display:flex;align-items:center;list-style:none;margin:0;padding:0;gap:2px}
.menu li{min-width:0}
.menu a{display:flex;align-items:center;gap:6px;padding:8px 10px;min-height:40px;border-radius:var(--r-sm);font-size:14px;color:var(--text);white-space:nowrap;transition:background-color var(--time-fast),color var(--time-fast)}
.menu a .ico{width:16px;height:16px;color:var(--muted)}
.menu a:hover,.menu a[aria-current="page"]{background:var(--accent-tint);color:var(--accent)}
.menu a[aria-current="page"]{font-weight:var(--weight-medium)}
.menu a:hover .ico,.menu a[aria-current="page"] .ico{color:var(--accent)}
.topbar__end{margin-left:auto;display:flex;align-items:center;gap:14px;flex-shrink:0}
.lang-wrap{position:relative}
.lang{display:flex;align-items:center;justify-content:center;gap:6px;min-height:44px;min-width:44px;width:auto;padding:8px 6px;border:0;background:none;font-size:14px;color:var(--muted);cursor:pointer;white-space:nowrap}
.lang .ico{width:16px;height:16px}
.lang__text{white-space:nowrap}
.lang__caret{font-size:11px}
.lang-panel{position:absolute;z-index:110;right:0;top:calc(100% + 8px);width:184px;padding:8px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:var(--shadow-ui)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-sm)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--accent-tint);color:var(--accent)}
.login{display:inline-flex;align-items:center;justify-content:center;gap:7px;height:40px;min-height:40px;padding:0 20px 0 16px;border:1.5px solid var(--text);border-radius:var(--r-pill);font-size:14px;font-weight:var(--weight-medium);color:var(--text);white-space:nowrap;transition:background-color var(--time-fast)}
.login .ico{width:16px;height:16px}
.login:hover{background:var(--ghost-hover)}
.burger{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;padding:10px;border:1px solid var(--border);border-radius:var(--r-sm);background:var(--panel);color:var(--accent)}
.burger .ico{width:22px;height:22px}
.nav-drawer{display:none;position:fixed;z-index:102;top:var(--header-height);left:0;right:0;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;background:var(--panel);padding:var(--space-3) var(--gutter)}
.nav-drawer a{display:flex;align-items:center;gap:12px;width:100%;min-height:48px;padding:12px 16px;border-radius:var(--r-sm)}
.nav-drawer a:hover,.nav-drawer a[aria-current="page"],.nav-drawer a[aria-current="true"]{background:var(--accent-tint);color:var(--accent)}
.drawer-languages{border-top:1px solid var(--border);margin-top:16px;padding-top:16px}
.nav-veil{position:fixed;z-index:101;inset:var(--header-height) 0 0;background:var(--veil);border:0}
html.nav-open{overflow:hidden}
.footer{background:var(--panel-2);border-top:1px solid var(--border);padding-top:var(--space-8);padding-bottom:var(--space-4)}
.footer__grid{display:grid;grid-template-columns:1.25fr 1fr 1fr;gap:var(--space-6)}
.footer__grid>*{min-width:0}
.footer__intro{max-width:340px;margin-top:var(--space-3);color:var(--muted)}
.footer__title{font:var(--weight-medium) var(--text-body)/1.6 var(--font-body);letter-spacing:normal;margin-bottom:var(--space-2)}
.footer__links{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 16px}
.footer__links a,.footer__languages a,.footer__legal a{display:inline-flex;align-items:center;min-height:32px;font-size:var(--text-sm)}
.footer a:hover{text-decoration:underline;text-underline-offset:4px;color:var(--accent)}
.footer__languages{display:flex;flex-wrap:wrap;gap:8px 24px;margin-top:var(--space-5)}
.footer__bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;margin-top:var(--space-4);padding-top:var(--space-3);border-top:1px solid var(--border);font-size:var(--text-sm);color:var(--muted)}
.footer__legal{display:flex;flex-wrap:wrap;gap:24px}
@media(max-width:1360px){.topbar__in{gap:16px;padding-inline:24px}.menu a{padding-inline:8px}}
@media(max-width:1240px){.desktop-nav{display:none}.burger{display:flex}.nav-drawer:not([hidden]){display:block}.topbar__end{margin-left:auto}}
@media(max-width:768px){
  :root{--text-h2:32px;--text-h3:25px;--gutter:20px}
  h1{font-size:40px;line-height:1.12}
  .grid--three{grid-template-columns:1fr}
  .section{padding-top:var(--space-8);padding-bottom:var(--space-8)}
  .topbar__in{padding-inline:var(--gutter);gap:12px}
  .topbar__end{margin-left:auto;gap:8px}
  .lang__text,.lang__caret{display:none}
  .footer__grid{grid-template-columns:1fr 1fr}
  .footer__grid>:first-child{grid-column:1/-1}
  .btn{height:48px;padding-inline:24px;font-size:15px}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .grid--two,.footer__grid{grid-template-columns:1fr}
  .panel,.card{padding:var(--space-3)}
  .tilt,[data-tilt]{transform:none}
  .decor-zone>[aria-hidden="true"]{max-width:100%}
  .topbar__in{gap:6px}
  .brand{gap:7px}
  .brand__word{font-size:17px}
  .brand__mark{width:28px;height:28px}
  .topbar__end{gap:4px}
  .login{padding-inline:12px;font-size:13px}
  .login .ico{display:none}
  .footer__links{gap:6px 12px}
}
@media(min-width:1241px){.nav-veil,.nav-drawer{display:none!important}}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending{opacity:1;transform:none;transition:none}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
}