:root {
  --bg:#EAEEF7;
  --bg-top:#F2F4FB;
  --bg-bottom:#E3E8F4;
  --bg-panel:#F8F9FD;
  --bg-panel2:#DDE3F1;
  --bg-side:#F3F5FB;
  --surface:#FFFFFF;
  --border:#CDD5E8;
  --border-soft:#E3E7F2;
  --accent:#B23A95;
  --accent-dark:#8A2573;
  --accent-soft:#E47FB8;
  --berry-50:#F8E8F2;
  --berry-100:#F3DDEC;
  --slate:#4F5F8F;
  --slate-50:#E8ECF7;
  --slate-ink:#272C47;
  --lilac:#CFC7EE;
  --text:#1C1F33;
  --text-muted:#5A6180;
  --success:#1F9D6B;
  --warn:#C4860F;
  --error:#D2394A;
  --flag-red:#D7303B;
  --flag-blue:#2A4390;
  --flag-white:#FFFFFF;
  --flag-edge:rgb(28 31 51 / .14);
  --glow-12:rgb(228 127 184 / .12);
  --pink-18:rgb(228 127 184 / .18);
  --pink-26:rgb(228 127 184 / .26);
  --pink-0:rgb(228 127 184 / 0);
  --berry-0:rgb(243 221 236 / 0);
  --shadow-06:rgb(178 58 149 / .06);
  --shadow-10:rgb(178 58 149 / .10);
  --shadow-16:rgb(178 58 149 / .16);
  --shadow-22:rgb(178 58 149 / .22);
  --hi:rgb(255 255 255 / .9);
  --hi-soft:rgb(255 255 255 / .55);
  --hi-0:rgb(255 255 255 / 0);
  --surface-70:rgb(255 255 255 / .7);
  --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","Apple SD Gothic Neo","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --r-board:16px;
  --r-card:12px;
  --r-btn:10px;
  --r-item:8px;
  --r-tag:6px;
  --r-pill:999px;
  --gutter:40px;
  --head-height:68px;
}
*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:84px;-webkit-text-size-adjust:100%}
html.nav-open{overflow:hidden}
body{margin:0;background:var(--bg);color:var(--text);font:17px/1.65 var(--font-body);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;overflow-x:clip}
a{color:inherit}
button{font:inherit;cursor:pointer}
p{margin:0 0 1em}
ul{margin:0;padding:0;list-style:none}
img,svg{display:block;max-width:100%}
svg{flex-shrink:0}
h1,h2,h3{font-family:var(--font-display);color:var(--text);text-wrap:balance;line-height:1.16;letter-spacing:-.02em}
h1{font-size:clamp(52px,5vw,72px);font-weight:800}
h2{font-size:clamp(32px,3.3vw,48px);font-weight:800}
h3{font-size:clamp(22px,2vw,28px)}
code,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere}
pre{overflow-x:auto;max-width:100%;white-space:pre}
:where(a,button,summary,[role="tab"],input):focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--r-item)}
.wrap{width:100%;max-width:1360px;margin-inline:auto;padding-inline:var(--gutter);min-width:0}
.wrap > *, .grid > *, .hero-in > *{min-width:0}
.sec{padding-top:88px;padding-bottom:88px}
.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}
.no-break{white-space:nowrap}
.reveal{transition:opacity .55s ease,transform .55s ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
.card,.panel{background:var(--bg-panel);border:1px solid var(--border-soft);border-radius:var(--r-card);box-shadow:inset 0 1px 0 var(--hi),0 18px 40px var(--shadow-06)}
.kicker{font-size:13px;font-weight:700;letter-spacing:.04em;color:var(--slate);line-height:1.3}
.kicker-accent{color:var(--accent)}
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:54px;padding:0 30px;border:0;border-radius:var(--r-btn);font:700 17px/1 var(--font-body);text-decoration:none;white-space:nowrap;flex-shrink:0;transition:transform .15s ease,box-shadow .15s ease}
.btn-primary{background:var(--accent);color:var(--surface);box-shadow:0 5px 0 var(--accent-soft),0 18px 30px var(--shadow-22)}
.btn-primary:hover{transform:translateY(2px);box-shadow:0 3px 0 var(--accent-soft),0 12px 22px var(--shadow-22)}
.btn-ghost,.btn-secondary{background:var(--surface);color:var(--text);box-shadow:inset 0 0 0 1.5px var(--border),0 5px 0 var(--bg-panel2)}
.btn-ghost:hover,.btn-secondary:hover{transform:translateY(2px);box-shadow:inset 0 0 0 1.5px var(--text-muted),0 3px 0 var(--bg-panel2)}
.btn:disabled{opacity:.55;cursor:not-allowed;transform:none}
.btn-small{min-height:40px;padding-inline:18px;font-size:14px}
.site-head{height:var(--head-height);position:relative;z-index:30}
.head-in{height:100%;display:flex;align-items:center}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text);flex-shrink:0}
.brand img{width:32px;height:32px}
.brand-word{font:800 21px/1 var(--font-display);letter-spacing:-.02em}
.brand-local{font-size:14px;font-weight:500;color:var(--text-muted)}
.nav{margin-left:auto}
.nav ul{display:flex;align-items:center;gap:30px;list-style:none;margin:0;padding:0}
.nav a{display:inline-flex;align-items:center;min-height:32px;font-size:15px;font-weight:500;color:var(--text-muted);text-decoration:none;white-space:nowrap;transition:color .15s}
.nav a:hover,.nav a[aria-current="page"]{color:var(--text)}
.nav a[aria-current="page"]{font-weight:700}
.head-tools{display:flex;align-items:center;gap:16px;margin-left:32px;padding-left:24px;border-left:1px solid var(--border)}
.login{display:inline-flex;align-items:center;justify-content:center;min-height:38px;padding:0 20px;border-radius:var(--r-item);border:1.5px solid var(--text);background:var(--surface);color:var(--text);font-size:15px;font-weight:700;text-decoration:none;white-space:nowrap}
.login:hover{background:var(--text);color:var(--surface)}
.lang-control{position:relative}
.lang-button,.menu-button{display:inline-flex;align-items:center;justify-content:center;min-width:44px;min-height:44px;width:auto;border:0;background:transparent;color:var(--text-muted);font-size:14px;font-weight:600;white-space:nowrap}
.lang-button span{white-space:nowrap}
.lang-menu{position:absolute;right:0;top:100%;min-width:158px;padding:6px;background:var(--surface);border:1px solid var(--border);border-radius:var(--r-card);box-shadow:0 16px 36px var(--shadow-10)}
.lang-menu[hidden],.mobile-nav[hidden],.nav-veil[hidden]{display:none}
.lang-menu a{display:flex;align-items:center;min-height:40px;padding:6px 12px;border-radius:var(--r-item);font-size:14px;text-decoration:none}
.lang-menu a:hover,.lang-menu a[aria-current="true"]{background:var(--berry-50);color:var(--accent-dark)}
.menu-button{display:none}
.mobile-nav{display:none}
.nav-veil{display:none}
.site-footer{padding-top:64px;padding-bottom:28px;background:var(--slate-ink);color:var(--surface);overflow-x:clip}
.footer-grid{display:grid;grid-template-columns:minmax(0,1.35fr) repeat(3,minmax(0,1fr));gap:48px}
.site-footer .brand,.site-footer h2{color:var(--surface)}
.site-footer .brand-local,.site-footer p{color:var(--lilac)}
.site-footer h2{margin:0 0 18px;font-size:17px}
.site-footer a:not(.brand){display:inline-flex;align-items:center;min-height:28px;text-decoration:none;color:var(--bg-panel)}
.site-footer a:hover{text-decoration:underline;text-underline-offset:3px}
.footer-links{display:grid;gap:4px}
.footer-bottom{margin-top:48px;padding-top:20px;border-top:1px solid var(--slate);font-size:14px;color:var(--lilac)}
#server-status{position:relative;display:block;overflow:hidden;max-width:100%;margin-bottom:32px}
body:has(.toc-tabs) section[id]{scroll-margin-top:124px}
@media(max-width:1180px){.nav ul{gap:16px}.head-tools{gap:8px;margin-left:18px;padding-left:16px}}
@media(max-width:1040px){
  .nav{display:none}
  .head-tools{margin-left:auto;border-left:0;padding-left:0}
  .menu-button{display:inline-flex}
  .mobile-nav{display:block;position:absolute;top:var(--head-height);left:var(--gutter);right:var(--gutter);max-height:calc(100dvh - var(--head-height) - 12px);overflow-y:auto;overscroll-behavior:contain;padding:12px;background:var(--surface);border:1px solid var(--border);border-radius:var(--r-card);box-shadow:0 20px 48px var(--shadow-16)}
  .mobile-nav ul{list-style:none;margin:0;padding:0}
  .mobile-nav a{display:flex;width:100%;align-items:center;min-height:44px;padding:10px 14px;border-radius:var(--r-item);text-decoration:none;font-weight:600}
  .mobile-nav a:hover,.mobile-nav a[aria-current="page"]{background:var(--berry-50);color:var(--accent-dark)}
  .mobile-nav-label{padding:16px 14px 4px;font-size:12px;color:var(--text-muted)}
  .nav-veil:not([hidden]){display:block;position:fixed;inset:var(--head-height) 0 0;background:var(--shadow-16);z-index:20}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:768px){h1{font-size:clamp(28px,8vw,40px)}.sec{padding-top:64px;padding-bottom:64px}}
@media(max-width:640px){
  :root{--gutter:20px}
  .no-break{white-space:normal}
  .wrap{padding-inline:var(--gutter)}
  .brand-word{font-size:19px}
  .brand img{width:28px;height:28px}
  .head-tools{gap:2px}
  .head-tools > .lang-control{display:none}
  .login{padding-inline:12px;min-height:36px;font-size:14px}
  .mobile-nav{left:var(--gutter);right:var(--gutter)}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:30px}
  .tilt,.phone.tilt{transform:none}
}
@media(max-width:360px){:root{--gutter:16px}.brand-local{display:none}}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending{opacity:1;transform:none;transition:none}
  *,*::before,*::after{animation-duration:0s!important;transition-duration:0s!important}
}