:root {
  --bg:#E7EBF8;
  --bg-hi:#EEF1FB;
  --bg-lo:#DFE5F5;
  --panel:#F7F8FE;
  --panel-sunk:#DAE0F2;
  --border:#C9D1EA;
  --border-soft:#DDE2F2;
  --border-strong:#B4BEDD;
  --accent:#E0336E;
  --accent-mid:#E6427A;
  --accent-dark:#B51E54;
  --accent-2:#FF6F91;
  --accent-soft:#FADDE7;
  --accent-soft-2:#F4C3D5;
  --text:#161A33;
  --text-muted:#59607E;
  --text-faint:#6B7392;
  --on-accent:#FFFFFF;
  --success:#17A673;
  --warn:#E9A410;
  --error:#D64224;
  --sky:#2384DA;
  --sky-ink:#1767B0;
  --sky-soft:#DCEAF9;
  --mint:#13996A;
  --mint-ink:#0B7550;
  --mint-soft:#D5F1E5;
  --sun:#F3B723;
  --sun-ink:#4F3600;
  --sun-soft:#FCEFC6;
  --flag-red:#D52B3C;
  --flag-white:#FFFFFF;
  --flag-blue:#1F3B8C;
  --flag-edge:rgba(22,26,51,.14);
  --hi-edge:rgba(255,255,255,.92);
  --hi-edge-soft:rgba(255,255,255,.28);
  --shadow-accent:rgba(224,51,110,.10);
  --shadow-accent-strong:rgba(224,51,110,.24);
  --shadow-ink:rgba(22,26,51,.08);
  --sky-glow-core:rgba(35,132,218,.10);
  --sky-glow-edge:rgba(35,132,218,.04);
  --clear:transparent;
  --radius-sm:8px;
  --radius-md:12px;
  --radius-lg:20px;
  --radius-card:24px;
  --radius-xl:32px;
  --radius-pill:999px;
  --radius-mark:10px;
  --radius-tiny:3px;
  --radius-dot:50%;
  --radius-keyword:.2em;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Microsoft YaHei","Apple SD Gothic Neo","Malgun Gothic",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Microsoft YaHei","Apple SD Gothic Neo","Malgun Gothic",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --gutter:48px;
  --content-width:1440px;
  --reading-width:820px;
  --header-height:72px;
  --anchor-offset:96px;
  --toc-offset:104px;
  --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);
  --duration-fast:.2s;
  --duration-reveal:.55s;
  --shadow-card:0 24px 56px -32px var(--shadow-accent),inset 0 1px 0 var(--hi-edge);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:var(--anchor-offset)}
html.nav-open{overflow:hidden}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased}
[hidden]{display:none!important}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button:disabled{cursor:not-allowed}
button{border:0}
img{max-width:100%;height:auto}
svg{flex-shrink:0}
button svg,a svg,summary svg{flex-shrink:0}
:focus-visible{outline:2px solid var(--accent-dark);outline-offset:3px}
::selection{background:var(--accent-soft);color:var(--accent-dark)}
h1,h2,h3,h4{font-family:var(--font-display);color:var(--text);overflow-wrap:break-word;text-wrap:balance}
h1{font-size:clamp(52px,4.45vw,64px);font-weight:700;line-height:1.12;letter-spacing:-.02em;margin:0 0 var(--space-3)}
h2{font-size:clamp(28px,3.1vw,44px);line-height:1.2;letter-spacing:-.02em;margin:0 0 var(--space-3)}
h3{font-size:24px;line-height:1.35;margin:0 0 var(--space-2)}
p{margin:0 0 var(--space-3)}
ul,ol{padding-left:1.5em}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere}
pre{max-width:100%;min-width:0;overflow-x:auto;padding:var(--space-3);border:1px solid var(--border);border-radius:var(--radius-md);background:var(--panel-sunk);color:var(--text)}
pre code{white-space:pre;overflow-wrap:normal}
hr{border:0;border-top:1px solid var(--border);margin-block:var(--space-4)}
table{border-collapse:collapse}
th{text-align:left}
.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)}
.section{padding-top:var(--space-12);padding-bottom:var(--space-12)}
.section-title{text-align:center;margin-bottom:var(--space-6)}
.section-intro{max-width:44em;margin:0 auto var(--space-5);text-align:center;color:var(--text-muted)}
.stack{display:grid;gap:var(--space-3)}
.grid{display:grid;gap:var(--space-3)}
.grid>*{min-width:0}
.grid--three{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--five{grid-template-columns:repeat(5,minmax(0,1fr))}
.panel,.card{min-width:0;padding:var(--space-4);border:1px solid var(--border-soft);border-radius:var(--radius-card);background:var(--panel);box-shadow:var(--shadow-card)}
.panel--sunk{background:var(--panel-sunk);border-radius:var(--radius-xl)}
.muted{color:var(--text-muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.no-break{white-space:nowrap}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.skip-link{position:fixed;top:8px;left:16px;z-index:100;transform:translateY(-160%);padding:12px 20px;border-radius:var(--radius-pill);background:var(--text);color:var(--on-accent)}
.skip-link:focus{transform:translateY(0)}
.ico{fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.globe-stroke{fill:none;stroke:var(--on-accent);stroke-width:1.8;stroke-linecap:round}
.st-a{stop-color:var(--accent)}
.st-a2{stop-color:var(--accent-2)}
.st-ad{stop-color:var(--accent-dark)}
.fl-r{fill:var(--flag-red)}
.fl-w{fill:var(--flag-white)}
.fl-b{fill:var(--flag-blue)}
.fl-ws{fill:none;stroke:var(--flag-white)}
.fl-rs{fill:none;stroke:var(--flag-red)}
.fl-edge{fill:none;stroke:var(--flag-edge);stroke-width:.5}
.flag{display:block;width:24px;height:16px;overflow:hidden;border-radius:var(--radius-tiny)}
.pf-icon{display:block;width:18px;height:18px;color:var(--text)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-width:24px;height:56px;padding:0 28px;border:0;border-radius:var(--radius-pill);font-size:18px;font-weight:600;white-space:nowrap;flex-shrink:0;transition:background var(--duration-fast),box-shadow var(--duration-fast)}
.btn--primary,.btn-primary{background:linear-gradient(100deg,var(--accent) 0%,var(--accent) 45%,var(--accent-mid) 100%);color:var(--on-accent);box-shadow:inset 0 1px 0 var(--hi-edge-soft),0 16px 30px -14px var(--shadow-accent-strong)}
.btn--primary:hover,.btn-primary:hover{background:var(--accent-dark)}
.btn--primary:active,.btn-primary:active{box-shadow:inset 0 2px 4px var(--shadow-ink)}
.btn__arrow{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round;transition:transform var(--duration-fast) ease}
.btn--primary:hover .btn__arrow{transform:translateX(3px)}
.btn--ghost,.btn-secondary{background:var(--panel);color:var(--text);box-shadow:inset 0 0 0 1.5px var(--border-strong)}
.btn--ghost:hover,.btn-secondary:hover{box-shadow:inset 0 0 0 1.5px var(--text)}
.btn--small{height:44px;padding-inline:20px;font-size:15px}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--panel-sunk);color:var(--text-muted);box-shadow:inset 0 0 0 1px var(--border);pointer-events:none}
.cta-row{display:flex;align-items:center;gap:12px;margin:0 0 12px}
.text-link{display:inline-flex;align-items:center;gap:8px;min-height:32px;color:var(--accent-dark);font-weight:600}
.text-link:hover{text-decoration:underline;text-underline-offset:4px}
.masthead{position:relative;z-index:20}
.masthead__bar{position:relative;height:var(--header-height);display:flex;align-items:center;gap:40px}
.brand{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:800;font-size:20px;letter-spacing:-.02em;color:var(--text);flex-shrink:0}
.brand__mark{display:block;width:34px;height:34px;border-radius:var(--radius-mark);box-shadow:0 8px 16px -8px var(--shadow-accent-strong)}
.dotnav{display:flex;align-items:center;list-style:none;margin:0;padding:0}
.dotnav li{display:flex;align-items:center}
.dotnav li+li::before{content:"·";color:var(--text-faint);font-weight:700;padding-inline:2px}
.dotnav a{display:inline-flex;align-items:center;justify-content:center;height:36px;padding:0 14px;border-radius:var(--radius-pill);font-size:15px;font-weight:500;color:var(--text-muted);white-space:nowrap}
.dotnav a:hover{color:var(--text)}
.dotnav a[aria-current="page"]{background:var(--accent-soft);color:var(--accent-dark);font-weight:600}
.masthead__end{margin-left:auto;display:flex;align-items:center;gap:12px}
.language-picker{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;height:40px;padding:0 12px;border:0;border-radius:var(--radius-pill);background:var(--clear);font-size:14px;color:var(--text-muted);cursor:pointer}
.lang__text{white-space:nowrap}
.lang svg{width:16px;height:16px}
.lang:hover{color:var(--text)}
.lang-menu{position:absolute;right:0;top:calc(100% + 8px);z-index:25;min-width:180px;margin:0;padding:8px;list-style:none;background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:0 16px 32px -12px var(--shadow-accent-strong)}
.lang-menu a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--radius-sm)}
.lang-menu a:hover,.lang-menu a[aria-current="true"]{background:var(--accent-soft);color:var(--accent-dark)}
.login{display:inline-flex;align-items:center;justify-content:center;height:40px;padding:0 22px;border-radius:var(--radius-pill);background:var(--text);color:var(--on-accent);font-size:15px;font-weight:600;white-space:nowrap;box-shadow:inset 0 1px 0 var(--hi-edge-soft),0 10px 20px -12px var(--shadow-ink)}
.login:hover{background:var(--accent-dark)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;padding:10px;border-radius:var(--radius-md);background:var(--panel);box-shadow:inset 0 0 0 1px var(--border)}
.menu-toggle svg{width:24px;height:24px}
.mobile-drawer{display:none}
.site-footer{padding-top:var(--space-8);padding-bottom:var(--space-4);background:var(--panel-sunk);border-top:1px solid var(--border);box-shadow:inset 0 1px 0 var(--hi-edge)}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:var(--space-6)}
.footer-grid>*{min-width:0}
.footer-brand p{max-width:30em;margin-top:var(--space-3);color:var(--text-muted)}
.footer-heading{font-size:16px;font-weight:700;margin:0 0 12px}
.footer-links{display:flex;flex-wrap:wrap;gap:4px 16px;list-style:none;padding:0;margin:0}
.footer-links a{display:inline-flex;align-items:center;min-height:32px;font-size:14px;color:var(--text-muted)}
.footer-links a:hover{color:var(--accent-dark);text-decoration:underline}
.footer-bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;margin-top:var(--space-6);padding-top:var(--space-3);border-top:1px solid var(--border);font-size:13px;color:var(--text-muted)}
.prose{min-width:0;line-height:1.85;overflow-wrap:break-word}
.prose h2{margin-top:var(--space-8);font-size:32px}
.prose h3{margin-top:var(--space-5)}
.prose a:not(.btn){color:var(--accent-dark);text-decoration:underline;text-underline-offset:3px}
.prose li+li{margin-top:8px}
.prose img{display:block;border-radius:var(--radius-md)}
.reveal{transition:opacity var(--duration-reveal) var(--ease-out),transform var(--duration-reveal) var(--ease-out)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-width:0;max-width:100%;overflow:hidden;margin-block:var(--space-4)}
#server-status>*{min-width:0;max-width:100%}
#server-status+*{margin-top:var(--space-4)}
.decorated,.top{position:relative;overflow-x:clip;max-width:100%}
@media(max-width:1200px){
  .masthead__bar{gap:24px}
  .dotnav a{padding-inline:10px}
}
@media(max-width:1080px){
  .desktop-nav{display:none}
  .masthead__end{margin-left:auto}
  .menu-toggle{display:inline-flex}
  .mobile-drawer{position:absolute;top:100%;left:var(--gutter);right:var(--gutter);z-index:24;display:block;max-height:calc(100dvh - var(--header-height) - 16px);overflow-y:auto;overscroll-behavior:contain;padding:16px;background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-card);box-shadow:0 24px 60px -24px var(--shadow-accent-strong)}
  .mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;border-radius:var(--radius-md)}
  .mobile-drawer a:hover,.mobile-drawer a[aria-current]{background:var(--accent-soft);color:var(--accent-dark)}
  .mobile-drawer__languages{border-top:1px solid var(--border);margin-top:12px;padding-top:12px}
  .grid--five{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media(max-width:768px){
  h1{font-size:clamp(28px,6vw,40px)}
  .grid--three{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1/-1}
}
@media(max-width:640px){
  :root{--gutter:20px;--space-12:64px;--toc-offset:104px}
  .no-break{white-space:normal}
  .wrap,.reading-wrap{padding-inline:var(--gutter)}
  .masthead__bar{gap:8px}
  .masthead__end{margin-left:auto;gap:4px}
  .lang{padding-inline:8px}
  .lang__text{display:none}
  .login{padding-inline:16px}
  .brand{gap:8px;font-size:18px}
  .brand__mark{width:30px;height:30px}
  .cta-row{flex-wrap:wrap}
  .btn{height:52px;padding-inline:22px;font-size:17px}
  .btn--small{height:44px;font-size:15px}
  .panel,.card{padding:24px}
  .grid--five{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:32px}
  .footer-bottom{align-items:flex-start;flex-direction:column}
  .tilt,[data-tilt]{transform:none!important}
  .decorated,.top,[data-hero-visual]{max-width:100%}
  .prose h2{font-size:28px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}