:root {
  color-scheme: light;
  --c-bg:#F2EFE9;
  --c-panel:#E7E1D6;
  --c-panel-hi:#EEE9E0;
  --c-panel-2:#FBFAF7;
  --c-border:#D6CFC2;
  --c-accent:#2D4B85;
  --c-accent-dark:#1C3263;
  --c-accent-lift:#4A6AA8;
  --c-accent-tint:#A9BCE0;
  --c-text:#1A1917;
  --c-muted:#5F5B54;
  --c-success:#3F7D4E;
  --c-warn:#B7791F;
  --c-error:#B23A2E;
  --c-ink:#1D1C1A;
  --c-ink-2:#24221F;
  --c-ink-3:#2E2C28;
  --c-ink-line:#5A564F;
  --c-ink-quiet:#B9B3A8;
  --c-ink-soft:#9A948A;
  --c-on-ink:#F4F1EA;
  --t-fog-1:#97A6BB;
  --t-fog-2:#71829B;
  --t-clay-1:#B8786A;
  --t-clay-1b:#A66859;
  --t-clay-2:#8E5548;
  --t-sand-1:#D8C9AB;
  --t-sand-2:#BEA982;
  --t-plum-1:#958290;
  --t-plum-2:#74606E;
  --t-sage-1:#9DAE95;
  --t-sage-2:#788A71;
  --t-ochre-1:#D0A65D;
  --t-ochre-2:#AA843F;
  --t-stone-1:#6F6B63;
  --t-stone-2:#4E4B46;
  --t-ochre-stripe:rgba(26,25,23,.07);
  --f-red:#B9402F;
  --f-white:#FBFAF7;
  --f-blue:#2D4B85;
  --f-edge:rgba(26,25,23,.16);
  --glow-sand:rgba(214,198,168,.55);
  --wash-cobalt:rgba(45,75,133,.045);
  --shadow-cobalt:rgba(45,75,133,.12);
  --shadow-cobalt-mid:rgba(45,75,133,.10);
  --shadow-cobalt-soft:rgba(45,75,133,.06);
  --shadow-deep:rgba(0,0,0,.48);
  --shadow-flag:rgba(0,0,0,.26);
  --hl-paper:rgba(255,255,255,.72);
  --hl-ink:rgba(255,255,255,.14);
  --hl-board:rgba(255,255,255,.08);
  --hl-core:rgba(255,255,255,.34);
  --hl-core-edge:rgba(255,255,255,.12);
  --hl-core-sheen:rgba(255,255,255,.17);
  --hl-tile:rgba(255,255,255,.24);
  --accent-ring:rgba(169,188,224,.42);
  --veil:rgba(29,28,26,.42);
  --clear:transparent;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --font-serif:Georgia,"Songti SC","STSong","Noto Serif SC","SimSun",serif;
  --weight-normal:400;
  --weight-medium:500;
  --weight-semibold:600;
  --weight-bold:700;
  --weight-display:800;
  --fs-tiny:10.5px;
  --fs-small:13px;
  --fs-nav:14.5px;
  --fs-body:15px;
  --fs-lede:18px;
  --fs-serif:22px;
  --fs-h1:64px;
  --fs-h1-mobile:36px;
  --fs-h2:34px;
  --fs-h3:22px;
  --r-xs:3px;
  --r-sm:8px;
  --r-md:12px;
  --r-lg:16px;
  --r-core:22px;
  --r-pill:999px;
  --gutter:32px;
  --page-width:1248px;
  --head-height:64px;
  --anchor-offset:80px;
  --toc-offset:144px;
  --space-section:88px;
  --shadow-panel:inset 0 1px 0 var(--hl-paper),0 24px 56px -24px var(--shadow-cobalt-mid),0 2px 6px var(--shadow-cobalt-soft);
  --ease-short:.2s ease;
}
*,*::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-text);font-family:var(--font-body);font-size:var(--fs-body);font-weight:var(--weight-normal);line-height:1.6;-webkit-font-smoothing:antialiased}
[hidden]{display:none!important}
img,video{max-width:100%;height:auto}
svg{vertical-align:middle;flex-shrink:0}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
a{color:inherit;text-underline-offset:.2em}
a:hover{color:var(--c-accent)}
button,a,summary{touch-action:manipulation}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--c-accent);outline-offset:4px}
::selection{background:var(--c-accent-tint);color:var(--c-text)}
h1,h2,h3,h4{font-family:var(--font-display);color:var(--c-text);line-height:1.2;text-wrap:balance}
h1{font-size:var(--fs-h1);font-weight:var(--weight-display);letter-spacing:-.02em;margin:0 0 24px}
h2{font-size:var(--fs-h2);font-weight:var(--weight-bold);margin:0 0 24px}
h3{font-size:var(--fs-h3);font-weight:var(--weight-bold);margin:0 0 16px}
p{margin:0 0 20px}
small{font-size:var(--fs-small)}
code,kbd,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:24px;background:var(--c-panel-2);border:1px solid var(--c-border);border-radius:var(--r-sm)}
pre code{overflow-wrap:normal;white-space:pre}
hr{border:0;border-top:1px solid var(--c-border);margin-block:32px}
.no-break{white-space:nowrap}
.wrap{width:100%;max-width:var(--page-width);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:var(--space-section);padding-bottom:var(--space-section)}
.section-head{max-width:760px;margin-bottom:40px}
.reading-wrap{max-width:840px;margin-inline:auto;padding-inline:var(--gutter)}
.prose{overflow-wrap:break-word}
.prose p,.prose li{line-height:1.85}
.prose h2{margin-top:56px}
.prose h3{margin-top:32px}
.prose img{border-radius:var(--r-sm)}
.prose blockquote{margin-inline:0;padding:20px 24px;border-left:3px solid var(--c-accent);background:var(--c-panel)}
.prose ol,.prose ul{padding-left:24px}
.prose li+li{margin-top:10px}
.grid-three{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.grid-two{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:32px}
:where(.grid-three,.grid-two,.hero-top,.footer-grid,.feature-layout)>*{min-width:0}
.panel,.card{padding:28px;border-radius:var(--r-md);background:var(--c-panel);box-shadow:inset 0 1px 0 var(--hl-paper),0 24px 60px -36px var(--shadow-cobalt)}
.panel-raised{background:var(--c-panel-2);border:1px solid var(--c-border);box-shadow:var(--shadow-panel)}
.muted{color:var(--c-muted)}
.mono-label{font-family:var(--font-mono);font-size:var(--fs-tiny);letter-spacing:.12em;text-transform:uppercase;color:var(--c-muted)}
.serif-copy{font-family:var(--font-serif);font-size:var(--fs-serif);line-height:1.65}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:48px;padding:10px 24px;font-family:var(--font-body);font-size:var(--fs-body);font-weight:var(--weight-semibold);text-decoration:none;border:1px solid var(--clear);border-radius:var(--r-pill);transition:transform var(--ease-short),background var(--ease-short),border-color var(--ease-short);flex-shrink:0;white-space:nowrap}
.btn .arr{width:16px;height:16px;transition:transform var(--ease-short)}
.btn:hover .arr{transform:translateX(3px)}
.btn-ink,.btn-primary{color:var(--c-panel-2);background:linear-gradient(180deg,var(--c-ink-3),var(--c-text));box-shadow:inset 0 1px 0 var(--hl-ink),0 14px 28px -14px var(--shadow-cobalt)}
.btn-ink:hover,.btn-primary:hover{color:var(--c-panel-2);transform:translateY(-1px);background:linear-gradient(180deg,var(--c-accent),var(--c-accent-dark))}
.btn-line,.btn-secondary{color:var(--c-text);background:var(--clear);border-color:var(--c-text)}
.btn-line:hover,.btn-secondary:hover{background:var(--c-panel-2);color:var(--c-accent);border-color:var(--c-accent)}
.btn:active{transform:translateY(1px)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.5;cursor:not-allowed;transform:none}
.btn-small{min-height:38px;padding:6px 18px;font-size:14px}
.cta-row{display:flex;align-items:center;gap:12px;margin:0 0 20px}
.cta-note{margin:0 0 0 8px;padding-left:16px;border-left:1px solid var(--c-border);font-size:12.5px;line-height:18px;color:var(--c-muted)}
.badge,.tag{display:inline-flex;align-items:center;gap:7px;min-height:26px;max-width:100%;padding:3px 10px;border-radius:var(--r-pill);background:var(--c-panel-2);color:var(--c-muted);font-family:var(--font-mono);font-size:var(--fs-tiny);overflow-wrap:anywhere}
.status-dot{width:6px;height:6px;border-radius:var(--r-pill);background:var(--c-success);flex-shrink:0}
.badge-success{color:var(--c-success)}
.badge-warn{color:var(--c-warn)}
.badge-error{color:var(--c-error)}
.site-head,#site-header{position:relative;z-index:60}
.head-row{height:var(--head-height);display:flex;align-items:center;gap:32px;flex-wrap:nowrap;position:relative}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:var(--c-text);flex-shrink:0}
.brand-mark{width:30px;height:30px;flex:none}
.brand-word{font-family:var(--font-display);font-weight:var(--weight-display);font-size:19px;letter-spacing:-.02em;white-space:nowrap}
.main-nav{margin-left:auto;flex:1;min-width:0}
.nav-list{display:flex;align-items:center;justify-content:flex-end;gap:30px;list-style:none;margin:0;padding:0}
.nav-list>li>a,.more-btn{font-family:var(--font-body);font-size:var(--fs-nav);color:var(--c-text);text-decoration:none;background:var(--clear);border:0;padding:6px 0;cursor:pointer;white-space:nowrap;min-height:32px;transition:color var(--ease-short)}
.nav-list>li>a:hover,.more-btn:hover{color:var(--c-accent)}
.nav-list a[aria-current="page"]{font-weight:var(--weight-semibold);box-shadow:inset 0 -2px 0 var(--c-text)}
.nav-more{position:relative}
.more-btn{display:inline-flex;align-items:center;gap:6px}
.more-caret{font-size:11px;color:var(--c-muted)}
.more-panel{position:absolute;top:calc(100% + 14px);right:-24px;z-index:65;width:340px;display:grid;grid-template-columns:1fr 1fr;gap:4px 20px;padding:18px 20px;background:var(--c-panel-2);border:1px solid var(--c-border);border-radius:var(--r-md);box-shadow:var(--shadow-panel)}
.more-title{margin:0 0 6px;font-family:var(--font-mono);font-size:var(--fs-tiny);letter-spacing:.12em;color:var(--c-muted)}
.more-group{display:flex;flex-direction:column;gap:2px;min-width:0}
.more-group a{display:flex;align-items:center;min-height:36px;font-size:14px;text-decoration:none;padding:5px 0;border-bottom:1px solid var(--c-border)}
.more-group a:last-child{border:0}
.head-tools{display:flex;align-items:center;gap:14px;flex-shrink:0}
.lang-select{position:relative}
.lang-btn{display:inline-flex;align-items:center;justify-content:center;gap:5px;min-height:34px;width:auto;min-width:44px;padding:0 14px;font-family:var(--font-body);font-size:13.5px;color:var(--c-text);background:var(--clear);border:1px solid var(--c-border);border-radius:var(--r-pill);white-space:nowrap}
.lang-btn span{white-space:nowrap}
.lang-btn:hover{border-color:var(--c-text)}
.lang-panel{position:absolute;top:calc(100% + 12px);right:0;z-index:70;min-width:176px;padding:8px;background:var(--c-panel-2);border:1px solid var(--c-border);border-radius:var(--r-md);box-shadow:var(--shadow-panel)}
.lang-panel a{display:flex;align-items:center;min-height:40px;padding:8px 12px;text-decoration:none;border-radius:var(--r-sm)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--c-panel)}
.login-btn{display:inline-flex;align-items:center;justify-content:center;min-height:36px;padding:0 20px;font-size:14px;font-weight:var(--weight-semibold);text-decoration:none;color:var(--c-panel-2);background:var(--c-text);border-radius:var(--r-pill);white-space:nowrap;box-shadow:inset 0 1px 0 var(--hl-ink)}
.login-btn:hover{color:var(--c-panel-2);background:var(--c-accent-dark)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;padding:8px;border:1px solid var(--c-border);border-radius:var(--r-sm);background:var(--c-clear)}
.menu-line{display:block;width:20px;height:2px;background:currentColor}
.mobile-drawer{position:fixed;top:var(--head-height);right:0;left:0;z-index:62;height:calc(100dvh - var(--head-height));max-height:calc(100dvh - var(--head-height));padding:16px var(--gutter) 40px;background:var(--c-panel-2);overflow-y:auto;overscroll-behavior:contain}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 8px;border-bottom:1px solid var(--c-border);text-decoration:none}
.mobile-drawer a[aria-current="page"]{color:var(--c-accent);font-weight:var(--weight-bold)}
.drawer-title{margin:24px 8px 8px;font-family:var(--font-mono);font-size:var(--fs-small);color:var(--c-muted)}
.nav-veil{position:fixed;inset:var(--head-height) 0 0;z-index:61;background:var(--veil);border:0}
html.nav-open{overflow:hidden}
.site-footer{padding-top:64px;padding-bottom:28px;background:var(--c-ink);color:var(--c-on-ink)}
.site-footer .brand{color:var(--c-on-ink)}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:64px}
.footer-intro{max-width:360px;margin-top:20px;font-family:var(--font-serif);font-size:var(--fs-lede);color:var(--c-ink-quiet)}
.footer-title{font-family:var(--font-mono);font-size:var(--fs-small);font-weight:var(--weight-medium);color:var(--c-ink-quiet);margin:0 0 16px}
.footer-links{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;text-decoration:none;color:var(--c-on-ink);font-size:var(--fs-small)}
.site-footer a:hover{color:var(--c-accent-tint)}
.footer-languages,.footer-legal{display:flex;flex-wrap:wrap;gap:8px 20px}
.footer-languages{margin-top:40px;padding-block:16px;border-top:1px solid var(--c-ink-line);border-bottom:1px solid var(--c-ink-line)}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;padding-top:20px;font-size:var(--fs-small);color:var(--c-ink-quiet)}
.footer-bottom p{margin:0}
.reveal{transition:opacity .35s ease,transform .35s ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-height:160px;max-width:100%;overflow:hidden;margin-block:24px 32px}
#server-status+*{margin-top:32px}
@media(max-width:1190px){
  .head-row{gap:20px}
  .nav-list{gap:20px}
  .head-tools{gap:10px}
}
@media(max-width:1099px){
  .footer-grid{gap:32px}
}
@media(max-width:900px){
  .main-nav{display:none}
  .head-tools{margin-left:auto}
  .menu-toggle{display:inline-flex}
  .head-row{gap:12px}
}
@media(min-width:901px){
  .mobile-drawer,.nav-veil{display:none!important}
}
@media(max-width:768px){
  :root{--gutter:18px;--space-section:56px;--fs-h2:28px;--fs-h3:20px}
  h1{font-size:var(--fs-h1-mobile);line-height:1.12}
  .grid-three,.grid-two{grid-template-columns:minmax(0,1fr)}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:32px}
  .cta-row{flex-wrap:wrap}
  .cta-note{flex-basis:100%;margin:4px 0 0;padding-left:0;border-left:0}
  .lang-btn{min-height:32px;padding:0 10px;font-size:12.5px}
  .login-btn{min-height:32px;padding:0 16px}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .tilt,[data-tilt]{transform:none}
  .decoration,.stripe-halo{max-width:100%}
  .panel,.card{padding:22px}
}
@media(max-width:380px){
  .brand{gap:6px}
  .brand-mark{width:25px;height:25px}
  .brand-word{font-size:16px}
  .head-tools{gap:6px}
  .lang-btn{padding-inline:8px;font-size:11px}
  .login-btn{padding-inline:12px;font-size:var(--fs-small)}
  .head-row{gap:8px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}