:root{
  --bg:#F9F1E4;--bg-panel:#FFFCF6;--bg-panel-2:#F2E7D5;--border:#E6D9C4;
  --accent:#5A2F96;--accent-dark:#3E1F6B;--text:#2B2118;--text-muted:#6E6052;
  --success:#2F8A5B;--warn:#C27A12;--error:#B8362F;
  --hero-top:#FCF7EE;--hero-bottom:#F3E8D6;--apricot:#E8945C;
  --block-lilac:#EEE6F7;--block-apricot:#F8E3D2;--on-accent:#FFFCF6;
  --hl:#FFFFFF;--hl-soft:rgba(255,255,255,.55);--panel-glass:rgba(255,252,246,.66);
  --tint-accent:rgba(90,47,150,.14);--tint-accent-soft:rgba(90,47,150,.06);
  --tint-apricot:rgba(232,148,92,.16);--tint-edge:rgba(90,47,150,.08);
  --glow-apricot:rgba(240,170,118,.42);--glow-apricot-soft:rgba(240,170,118,.22);
  --glow-lilac:rgba(184,156,226,.38);--glow-clear:rgba(249,241,228,0);
  --shadow-card:0 20px 44px -18px rgba(90,47,150,.10),0 2px 5px rgba(90,47,150,.05);
  --shadow-float:0 30px 64px -20px rgba(62,31,107,.26),0 8px 18px -6px rgba(90,47,150,.12);
  --shadow-float-sm:0 18px 36px -14px rgba(62,31,107,.22),0 3px 8px rgba(90,47,150,.08);
  --shadow-btn:0 14px 30px -12px rgba(90,47,150,.50);
  --shadow-btn-sm:0 10px 22px -10px rgba(90,47,150,.45);
  --success-ring:rgba(47,138,91,.16);--veil:rgba(43,33,24,.24);
  --flag-red:#C8443A;--flag-blue:#2E4785;--flag-white:#FFFCF6;
  --flag-edge:rgba(43,33,24,.14);--flag-shadow:rgba(62,31,107,.16);
  --mask:#000;--mask-clear:rgba(0,0,0,0);
  --r-card:14px;--r-tile:12px;--r-float:20px;--r-block:28px;--r-window:18px;--r-icon:16px;--r-pill:999px;--r-round:50%;
  --font-display:Georgia,'Iowan Old Style','Palatino Linotype','Songti SC','STSong','Source Han Serif SC','SimSun',serif;
  --font-body:'Inter','Noto Sans SC',-apple-system,'PingFang SC','Hiragino Sans GB','Microsoft YaHei',sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,'SFMono-Regular',Menlo,Consolas,monospace;
  --weight-normal:400;--weight-medium:500;--weight-strong:600;--weight-bold:700;
  --size-body:16px;--size-small:14px;--size-display:clamp(52px,4.6vw,64px);
  --gutter:24px;--content:1200px;--reading:780px;--header-height:72px;--anchor-offset:88px;--toc-offset:88px;--chapter-offset:160px;
  --duration:.2s;--reveal-duration:.35s;--paper-opacity:.03;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
body{margin:0;font-family:var(--font-body);font-size:var(--size-body);font-weight:var(--weight-normal);color:var(--text);line-height:1.6;background-color:var(--bg);background-image:linear-gradient(180deg,var(--hero-top) 0,var(--hero-bottom) 860px,var(--bg) 1180px);background-repeat:no-repeat;-webkit-font-smoothing:antialiased}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
button,a,input,select,textarea,summary,[tabindex]{-webkit-tap-highlight-color:var(--tint-accent)}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
a{color:var(--accent);text-underline-offset:4px}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
button:disabled,.btn[aria-disabled="true"]{cursor:not-allowed;opacity:.5}
[hidden]{display:none!important}
h1,h2,h3,h4{color:var(--accent-dark);line-height:1.25;overflow-wrap:break-word}
h1,h2{font-family:var(--font-display);font-weight:var(--weight-normal);text-wrap:balance;letter-spacing:-.02em}
h1{font-size:var(--size-display);line-height:1.12}
h2{font-size:38px}
h3{font-size:22px;font-weight:var(--weight-strong)}
p{margin-top:0;margin-bottom:24px}
.no-break{white-space:nowrap}
code,kbd,pre,.num{font-family:var(--font-mono)}
code{overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;border:1px solid var(--border);border-radius:var(--r-card);background:var(--bg-panel-2)}
pre code{overflow-wrap:normal;white-space:pre}
.wrap{width:100%;max-width:calc(var(--content) + var(--gutter)*2);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{width:100%;max-width:calc(var(--reading) + var(--gutter)*2);margin-inline:auto;padding-inline:var(--gutter)}
.sec{padding-top:72px;padding-bottom:72px}
.wrap>*,.reading-wrap>*,.grid>*,.band>*,.footer-grid>*{min-width:0}
.grid{display:grid;gap:24px}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-five{grid-template-columns:repeat(5,minmax(0,1fr))}
.card,.panel{min-width:0;padding:28px;border:1px solid var(--border);border-radius:var(--r-card);background:var(--bg-panel);box-shadow:inset 0 1px 0 var(--hl),var(--shadow-card)}
.panel-sunken{background:var(--bg-panel-2);box-shadow:inset 0 1px 0 var(--hl-soft)}
.muted{color:var(--text-muted)}
.section-title{margin:0 0 56px;text-align:center;font-family:var(--font-display);font-weight:var(--weight-normal);font-size:38px;line-height:1.2;letter-spacing:-.02em;color:var(--accent-dark)}
.section-lead{max-width:760px;margin:0 auto 40px;text-align:center;color:var(--text-muted)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:52px;padding:10px 32px;border:0;border-radius:var(--r-pill);font-family:var(--font-body);font-size:16px;font-weight:var(--weight-strong);line-height:1.4;text-decoration:none;flex-shrink:0;white-space:nowrap;transition:transform var(--duration),background-color var(--duration),box-shadow var(--duration)}
.btn-solid,.btn-primary{background:var(--accent);color:var(--on-accent);box-shadow:var(--shadow-btn)}
.btn-solid:hover,.btn-primary:hover{background:var(--accent-dark);transform:translateY(-1px)}
.btn-solid:active,.btn-primary:active{transform:translateY(0);box-shadow:var(--shadow-btn-sm)}
.btn-line,.btn-secondary{background:var(--panel-glass);color:var(--accent);box-shadow:inset 0 0 0 1.5px var(--accent)}
.btn-line:hover,.btn-secondary:hover{background:var(--tint-accent-soft)}
.btn-sm{min-height:46px;padding:10px 26px;font-size:15px}
.text-link{display:inline-flex;align-items:center;min-height:24px;color:var(--accent);font-size:15px;font-weight:var(--weight-strong);text-decoration:none}
.text-link:hover{text-decoration:underline}
.button-row{display:flex;flex-wrap:wrap;align-items:center;gap:14px}
.topbar{position:relative;z-index:50}
.topbar-inner{position:relative;z-index:53;max-width:1280px;margin:0 auto;height:var(--header-height);padding:0 40px;display:flex;align-items:center;gap:32px;flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;color:var(--accent-dark);flex:none}
.brand-mark{width:34px;height:34px;flex:none;display:block}
.brand-word{font-family:var(--font-display);font-size:23px;letter-spacing:-.01em;line-height:1}
.nav{flex:1;display:flex;justify-content:center;min-width:0}
.nav-list{list-style:none;margin:0;padding:0;display:flex;align-items:center}
.nav-list li{display:flex;align-items:center}
.nav-list li+li::before{content:"·";color:var(--text-muted);opacity:.55;padding:0 12px;font-weight:var(--weight-bold)}
.nav-list a{color:var(--text);text-decoration:none;font-size:15px;padding:6px 2px;white-space:nowrap;transition:color var(--duration)}
.nav-list a:hover{color:var(--accent)}
.nav-list a[aria-current="page"]{color:var(--accent-dark);font-weight:var(--weight-strong);text-decoration:underline;text-decoration-color:var(--accent);text-decoration-thickness:2px;text-underline-offset:8px}
.topbar-tools{display:flex;align-items:center;gap:12px;flex-shrink:0;margin-left:auto}
.lang-picker{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:5px;width:auto;min-width:44px;min-height:40px;font:inherit;font-size:14px;color:var(--text-muted);background:transparent;border:1px solid transparent;border-radius:var(--r-pill);padding:7px 12px;white-space:nowrap;transition:background-color var(--duration),border-color var(--duration)}
.lang:hover{background:var(--bg-panel);border-color:var(--border)}
.lang-menu{position:absolute;z-index:60;right:0;top:calc(100% + 8px);min-width:170px;margin:0;padding:8px;list-style:none;border:1px solid var(--border);border-radius:var(--r-card);background:var(--bg-panel);box-shadow:var(--shadow-float-sm)}
.lang-menu a{display:flex;align-items:center;min-height:44px;padding:8px 12px;text-decoration:none;color:var(--text);border-radius:var(--r-tile)}
.lang-menu a:hover,.lang-menu a[aria-current="true"]{background:var(--bg-panel-2);color:var(--accent-dark)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;height:40px;padding:0 22px;border-radius:var(--r-pill);background:var(--accent);color:var(--on-accent);font-size:15px;font-weight:var(--weight-strong);text-decoration:none;box-shadow:var(--shadow-btn-sm);white-space:nowrap;transition:background-color var(--duration)}
.btn-login:hover{background:var(--accent-dark)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;padding:10px;border:1px solid var(--border);border-radius:var(--r-tile);background:var(--bg-panel);color:var(--accent-dark)}
.menu-line{display:block;width:20px;height:2px;background:currentColor}
.mobile-drawer{display:none}
.menu-veil{display:none}
html.nav-open{overflow:hidden}
.site-footer{position:relative;z-index:1;border-top:1px solid var(--border);background:var(--bg-panel-2);padding-top:56px;padding-bottom:28px}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:48px}
.footer-brand p{max-width:340px;margin:22px 0;color:var(--text-muted)}
.footer-heading{margin:0 0 16px;font-family:var(--font-body);font-size:16px;font-weight:var(--weight-strong)}
.footer-links{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:5px 16px}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:32px;color:var(--text-muted);text-decoration:none;overflow-wrap:anywhere}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{color:var(--accent);text-decoration:underline}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:32px;padding-top:24px;border-top:1px solid var(--border)}
.footer-languages [aria-current="true"]{color:var(--accent-dark);font-weight:var(--weight-strong)}
.footer-bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;margin-top:24px;color:var(--text-muted);font-size:14px}
.footer-bottom p{margin:0}
.footer-legal{display:flex;flex-wrap:wrap;gap:16px}
.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:relative;display:block;min-width:0;max-width:100%;overflow:hidden;margin-top:24px;margin-bottom:32px}
#server-status+*{margin-top:32px}
.decor-section{position:relative;overflow-x:clip}
.grain{position:fixed;inset:0;width:100%;height:100%;z-index:0;opacity:var(--paper-opacity);pointer-events:none;mix-blend-mode:multiply}
.svg-defs{position:absolute;width:0;height:0;overflow:hidden}
.fl-red{fill:var(--flag-red)}.fl-blue{fill:var(--flag-blue)}.fl-white{fill:var(--flag-white)}
.fl-edge{fill:none;stroke:var(--flag-edge);stroke-width:1}
.prose{min-width:0;overflow-wrap:break-word}
.prose h2{margin-top:56px;margin-bottom:24px;font-size:32px}
.prose h3{margin-top:32px;margin-bottom:16px}
.prose li{margin-bottom:10px}
.prose blockquote{margin-inline:0}
.prose img{border-radius:var(--r-card)}
body:has(.toc-tabs) section[id]{scroll-margin-top:var(--chapter-offset)}
@media(max-width:1280px){
  .topbar-inner{padding:0 28px;gap:20px}
  .nav-list li+li::before{padding:0 8px}
  .nav-list a{font-size:14px}
}
@media(max-width:1120px){
  .topbar-inner{gap:16px}
  .topbar-tools{gap:8px}
  .nav-list li+li::before{padding:0 6px}
  .lang{padding-inline:8px}
}
@media(max-width:960px){
  .topbar-inner{padding:0 20px}
  .nav{display:none}
  .topbar-tools{margin-left:auto}
  .menu-toggle{display:inline-flex}
  .mobile-drawer{display:block;position:fixed;z-index:52;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;padding:16px 24px 40px;background:var(--bg-panel);border-top:1px solid var(--border)}
  .mobile-drawer a{display:flex;align-items:center;width:100%;min-height:48px;padding:12px 16px;color:var(--text);text-decoration:none;border-bottom:1px solid var(--border)}
  .mobile-drawer a:hover,.mobile-drawer a[aria-current]{background:var(--bg-panel-2);color:var(--accent-dark)}
  .drawer-languages{margin-top:20px;border-top:1px solid var(--border)}
  .menu-veil{display:block;position:fixed;z-index:51;inset:var(--header-height) 0 0;background:var(--veil);border:0}
  .grid-five{grid-template-columns:repeat(3,minmax(0,1fr))}
  .footer-grid{gap:28px;grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1/-1}
}
@media(max-width:768px){
  h1{font-size:38px}
  .grid-three{grid-template-columns:1fr}
}
@media(max-width:640px){
  :root{--gutter:16px;--header-height:64px;--anchor-offset:80px;--toc-offset:16px;--chapter-offset:104px}
  .no-break{white-space:normal}
  .tilt,[data-tilt]{transform:none}
  .decor-section,.hero{max-width:100%;overflow-x:clip}
  .decor-section [aria-hidden="true"]{max-width:100%}
  .topbar-inner{padding-inline:16px;gap:8px}
  .brand{gap:7px}
  .brand-mark{width:28px;height:28px}
  .brand-word{font-size:20px}
  .topbar-tools{gap:4px;margin-left:auto}
  .btn-login{padding-inline:13px;font-size:14px}
  .lang{font-size:12px;padding-inline:5px}
  h1{font-size:34px}h2{font-size:28px}
  .section-title{font-size:28px;margin-bottom:36px}
  .sec{padding-top:48px;padding-bottom:48px}
  .card,.panel{padding:22px}
  .footer-grid{grid-template-columns:1fr}
  .footer-brand{grid-column:auto}
  .grid-five{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-bottom{align-items:flex-start;flex-direction:column}
}
@media(max-width:360px){
  .topbar-inner{padding-inline:12px}
  .brand-word{font-size:18px}
  .brand-mark{width:26px;height:26px}
  .brand{gap:5px}
  .btn-login{padding-inline:10px}
  .lang{font-size:11px;padding-inline:3px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none;transition:none}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
}