:root{
  --bg:#F7F0E4;--bg-top:#FBF7EE;--bg-bottom:#F1E8D8;--panel:#FFFCF6;--panel-2:#EFE6D5;--panel-soft:#F9F3E8;
  --border:#E4D9C6;--border-strong:#D2C4AD;--line:#EEE5D6;
  --accent:#4840B8;--accent-2:#7A73E0;--accent-dark:#2F2A85;--accent-deep:#231F5C;
  --text:#2B2218;--muted:#6E6252;--faint:#9A8D7A;--success:#2F8A4E;--warn:#C27A12;--error:#C2402E;
  --on-accent:#FFFCF6;--on-dark:#F7F0E4;--on-dark-muted:rgba(247,240,228,.68);--on-dark-line:rgba(247,240,228,.55);--dot-dark:rgba(247,240,228,.28);
  --accent-soft:rgba(72,64,184,.08);--accent-soft-2:rgba(72,64,184,.16);--accent-line:rgba(72,64,184,.24);
  --frame:rgba(220,216,242,.82);--frame-ring:rgba(122,115,224,.22);--win-edge:rgba(43,34,24,.07);--side-ring:rgba(255,255,255,.07);
  --hl:rgba(255,255,255,.92);--hl-dark:rgba(255,255,255,.07);--grid:rgba(43,34,24,.035);--apricot:rgba(234,186,134,.42);--deco:rgba(72,64,184,.22);--ground:rgba(72,64,184,.12);
  --flag-red:var(--error);--flag-blue:var(--accent-deep);--flag-white:#FFFFFF;--flag-edge:rgba(43,34,24,.14);--veil:rgba(35,31,92,.35);--transparent:transparent;
  --sh-nav:0 14px 34px -22px rgba(72,64,184,.28),0 2px 6px -3px rgba(72,64,184,.08);
  --sh-btn:0 12px 24px -12px rgba(72,64,184,.55),inset 0 1px 0 rgba(255,255,255,.22);
  --sh-pill:0 6px 12px -6px rgba(72,64,184,.55);
  --sh-badge:0 6px 14px -10px rgba(72,64,184,.22);
  --sh-seg:0 1px 3px rgba(43,34,24,.12),0 0 0 1px rgba(43,34,24,.04);
  --sh-knob:0 1px 2px rgba(35,31,92,.35);
  --sh-win:0 36px 80px -34px rgba(72,64,184,.12),0 14px 30px -18px rgba(72,64,184,.10);
  --sh-float:0 40px 70px -26px rgba(72,64,184,.14),0 18px 34px -16px rgba(47,42,133,.16);
  --r-xs:4px;--r-sm:8px;--r-md:10px;--r-lg:12px;--r-xl:16px;--r-pill:999px;
  --f-display:"Inter","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --f-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --f-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --fs-body:16px;--fs-small:14px;--fs-h1:64px;--fs-h2:32px;--fs-h3:22px;
  --gutter:24px;--content-width:1240px;--reading-width:800px;--section-space:72px;
  --toc-top:16px;--anchor-offset:96px;--entry-time:.35s;--quick-time:.2s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:var(--anchor-offset)}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--f-body);font-size:var(--fs-body);line-height:1.5;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
[hidden]{display:none!important}
img{max-width:100%;height:auto}
svg{flex-shrink:0}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
a{color:var(--accent);text-underline-offset:3px}
:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:var(--r-xs)}
button:disabled,[aria-disabled="true"]{cursor:not-allowed;opacity:.55}
h1,h2,h3{font-family:var(--f-display);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:clamp(52px,5vw,72px);line-height:1.1;letter-spacing:-.02em;font-weight:800;color:var(--accent)}
h2{font-size:var(--fs-h2);line-height:1.3;letter-spacing:-.02em}
h3{font-size:var(--fs-h3);line-height:1.4}
p{overflow-wrap:break-word}
code{font-family:var(--f-mono);overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--panel-2);border:1px solid var(--border);border-radius:var(--r-sm)}
pre code{overflow-wrap:normal;white-space:pre}
.no-break{white-space:nowrap}
.wrap{width:100%;max-width:var(--content-width);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{max-width:var(--reading-width);margin-inline:auto;padding-inline:var(--gutter)}
.sec{padding-top:var(--section-space);padding-bottom:var(--section-space)}
.grid{display:grid;gap:24px}
.grid>*{min-width:0}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
.muted{color:var(--muted)}
.mono{font-family:var(--f-mono);font-variant-numeric:tabular-nums}
.panel,.card{min-width:0;padding:24px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-lg);box-shadow:inset 0 1px 0 var(--hl),var(--sh-win)}
.panel-soft{background:var(--panel-soft)}
.decorated,.top{position:relative;overflow-x:clip;max-width:100%}
.top{background:linear-gradient(var(--grid) 1px,var(--transparent) 1px) 0 0/32px 32px,linear-gradient(90deg,var(--grid) 1px,var(--transparent) 1px) 0 0/32px 32px,radial-gradient(ellipse 46% 40% at 12% 86%,var(--apricot),var(--transparent) 70%),linear-gradient(180deg,var(--bg-top) 0%,var(--bg) 46%,var(--bg-bottom) 100%)}
.notice{background:var(--accent-deep);color:var(--on-dark);font-size:13.5px;line-height:18px;padding:8px 24px;text-align:center}
.notice a{display:inline-flex;align-items:center;min-height:24px;color:var(--on-dark);font-weight:600;margin-left:10px;text-decoration:underline;text-decoration-color:var(--on-dark-line);text-underline-offset:3px}
.notice a:hover{text-decoration-color:var(--on-dark)}
.hdr{position:relative;z-index:50;padding:10px 24px 0}
.navcard{position:relative;max-width:1240px;height:56px;margin:0 auto;display:flex;align-items:center;gap:24px;padding:0 12px 0 20px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-lg);box-shadow:inset 0 1px 0 var(--hl),var(--sh-nav)}
.brand{display:inline-flex;align-items:center;gap:9px;text-decoration:none;flex:none;min-height:24px}
.brand-mark{width:28px;height:26px;display:block}
.brand-word{font-family:var(--f-display);font-weight:800;font-size:20px;letter-spacing:-.02em;color:var(--text)}
.brand-word em{font-style:normal;color:var(--accent)}
.tabs{flex:1;display:flex;justify-content:center;min-width:0}
.tabs ul{list-style:none;margin:0;padding:0;display:flex;align-items:center;gap:4px;height:56px}
.tabs a{position:relative;display:flex;align-items:center;height:56px;padding:0 12px;color:var(--muted);font-size:14.5px;font-weight:500;text-decoration:none;white-space:nowrap;transition:color var(--quick-time)}
.tabs a:hover{color:var(--text)}
.tabs a.is-on{color:var(--accent);font-weight:600}
.tabs a.is-on::after{content:"";position:absolute;left:12px;right:12px;bottom:-1px;height:3px;border-radius:var(--r-xs) var(--r-xs) 0 0;background:var(--accent)}
.nav-end{display:flex;align-items:center;gap:8px;flex-shrink:0}
.lang-picker{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;height:36px;padding:0 12px;border:0;background:var(--transparent);border-radius:var(--r-sm);color:var(--muted);font-size:13.5px;white-space:nowrap}
.lang span{white-space:nowrap}
.lang svg{width:15px;height:15px;display:block}
.lang-caret{font-size:11px}
.lang-panel{position:absolute;right:0;top:calc(100% + 10px);z-index:70;min-width:168px;padding:8px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-sm);box-shadow:var(--sh-float)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;color:var(--text);text-decoration:none;border-radius:var(--r-xs)}
.lang-panel a:hover,.lang-panel a[aria-current]{background:var(--accent-soft);color:var(--accent)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;height:36px;padding:0 20px;border-radius:var(--r-pill);background:var(--panel);color:var(--accent);font-size:14px;font-weight:600;text-decoration:none;box-shadow:inset 0 0 0 1.5px var(--accent);transition:background var(--quick-time);white-space:nowrap}
.btn-login:hover{background:var(--accent-soft)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;padding:10px;border:0;border-radius:var(--r-sm);background:var(--transparent);color:var(--accent-dark)}
.menu-line{display:block;width:20px;height:2px;background:currentColor;border-radius:var(--r-xs)}
.mobile-drawer{display:none}
.nav-veil{display:none}
html.nav-open{overflow:hidden}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:48px;padding:10px 30px;border:0;border-radius:var(--r-pill);font-size:16px;font-weight:600;text-decoration:none;transition:transform var(--quick-time),box-shadow var(--quick-time),background var(--quick-time);flex-shrink:0;white-space:nowrap}
.btn:hover{transform:translateY(-1px)}
.btn svg{width:16px;height:16px;display:block}
.btn-solid,.btn-primary{background:linear-gradient(120deg,var(--accent) 0%,var(--accent) 34%,var(--accent-2) 100%);color:var(--on-accent);box-shadow:var(--sh-btn)}
.btn-line,.btn-secondary{background:var(--panel);color:var(--accent-dark);box-shadow:inset 0 0 0 1.5px var(--accent)}
.btn-line:hover,.btn-secondary:hover{background:var(--accent-soft)}
.btn:active{transform:translateY(0)}
.btn-small{min-height:36px;padding:6px 18px;font-size:var(--fs-small)}
.reveal{transition:opacity var(--entry-time) ease,transform var(--entry-time) ease}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:block;min-height:120px;max-width:100%;overflow:hidden;margin-top:24px;margin-bottom:24px}
#server-status>*{min-width:0;max-width:100%}
#server-status+*{margin-top:24px}
.site-footer{background:var(--panel-2);border-top:1px solid var(--border);padding-top:48px;padding-bottom:32px}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr 1fr;gap:32px}
.footer-grid>*{min-width:0}
.footer-brand p{max-width:30ch;color:var(--muted);line-height:1.8}
.footer-title{margin:0 0 12px;font-size:16px;font-weight:700}
.footer-links{list-style:none;margin:0;padding:0;display:grid;gap:4px}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;color:var(--muted);text-decoration:none;overflow-wrap:anywhere}
.footer-links a:hover{color:var(--accent);text-decoration:underline}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-top:32px;padding-top:20px;border-top:1px solid var(--border);font-size:13px;color:var(--muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:16px}
.footer-legal a{display:inline-flex;align-items:center;min-height:28px;color:var(--muted)}
@media(max-width:1180px){
 .navcard{gap:14px}.tabs a{padding:0 9px;font-size:14px}.tabs a.is-on::after{left:9px;right:9px}
}
@media(max-width:1024px){
 .hdr{padding-inline:16px}
 .navcard{height:56px;padding:0 10px;gap:8px;flex-wrap:nowrap}
 .tabs{display:none}
 .nav-end{margin-left:auto}
 .menu-toggle{display:inline-flex}
 .mobile-drawer{position:fixed;left:0;right:0;top:var(--drawer-top,110px);height:calc(100dvh - var(--drawer-top,110px));max-height:calc(100dvh - var(--drawer-top,110px));overflow-y:auto;overscroll-behavior:contain;z-index:45;background:var(--panel);padding:16px var(--gutter) 32px;border-top:1px solid var(--border)}
 .mobile-drawer:not([hidden]){display:block}
 .mobile-drawer ul{list-style:none;margin:0;padding:0;display:block}
 .mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px;color:var(--text);text-decoration:none;border-radius:var(--r-sm)}
 .mobile-drawer a.is-on,.mobile-drawer a[aria-current]{background:var(--accent-soft);color:var(--accent)}
 .drawer-languages{display:grid;border-top:1px solid var(--border);margin-top:16px;padding-top:16px}
 .nav-veil{position:fixed;inset:var(--drawer-top,110px) 0 0;z-index:40;background:var(--veil);border:0}
 .nav-veil:not([hidden]){display:block}
 .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:768px){
 h1{font-size:clamp(28px,7vw,40px)}
 .grid-three{grid-template-columns:1fr}
 :root{--section-space:48px;--fs-h2:28px}
}
@media(max-width:640px){
 :root{--gutter:16px}
 .no-break{white-space:normal}
 .tilt,.tilt-card,[data-tilt]{transform:none}
 .decorated,.top{max-width:100%;overflow-x:clip}
 .notice{padding:8px 16px;font-size:12px}
 .navcard{gap:4px}
 .brand{gap:5px}.brand-mark{width:24px;height:24px}.brand-word{font-size:18px}
 .nav-end{gap:2px;margin-left:auto}
 .lang{padding:0 6px;font-size:12px;gap:3px}
 .lang svg{display:none}
 .btn-login{padding:0 12px;font-size:13px}
 .footer-grid{grid-template-columns:1fr}
 .panel,.card{padding:20px}
 .wrap,.reading-wrap{padding-inline:var(--gutter)}
}
@media(prefers-reduced-motion:reduce){
 html{scroll-behavior:auto}
 *,*::before,*::after{transition-duration:0s!important;animation-duration:0s!important;animation-iteration-count:1!important}
 .reveal,.reveal.pending{opacity:1;transform:none}
}