:root{
  color-scheme:light;
  --bg:#F8F1E2;
  --bg-top:#FBF7EE;
  --bg-bottom:#F3E9D7;
  --panel:#FFFCF6;
  --panel-2:#F0E6D3;
  --panel-3:#FAF4E8;
  --card:#FFFEFA;
  --border:#E3D6BF;
  --border-strong:#D3C1A2;
  --line:#EFE5D3;
  --accent:#2348C8;
  --accent-dark:#19349A;
  --accent-tint:#E8ECF8;
  --text:#2A231B;
  --muted:#6E6254;
  --faint:#9C8E7B;
  --success:#2E8B57;
  --warn:#C98A0B;
  --error:#C0392B;
  --marker:#FFD54A;
  --marker-soft:#FFEDAA;
  --strip-yellow:#FFF2C9;
  --ochre:#94571A;
  --white:#FFFFFF;
  --hi:rgba(255,255,255,.9);
  --hi-on-accent:rgba(255,255,255,.24);
  --tape:rgba(255,252,246,.58);
  --tape-edge:rgba(211,193,162,.55);
  --veil:rgba(42,35,27,.36);
  --dot-a:#DDB3A2;
  --dot-b:#E6CF9C;
  --dot-c:#B6CDB4;
  --flag-red:#D2232E;
  --flag-blue:#1F3F8E;
  --flag-navy:#2E3170;
  --flag-white:#FFFFFF;
  --flag-edge:rgba(42,35,27,.16);
  --shadow-near:0 6px 12px -6px rgba(84,60,28,.22);
  --shadow-ink:0 26px 48px -6px rgba(35,72,200,.10);
  --shadow-card:0 2px 6px -3px rgba(84,60,28,.16);
  --shadow-chip:0 4px 10px -4px rgba(84,60,28,.20),0 16px 30px -12px rgba(35,72,200,.14);
  --shadow-cta:0 12px 24px -12px rgba(25,52,154,.6);
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --weight-regular:400;
  --weight-medium:500;
  --weight-semibold:600;
  --weight-bold:700;
  --weight-heavy:800;
  --r-xs:4px;
  --r-sm:6px;
  --r-md:10px;
  --r-pill:999px;
  --r-circle:50%;
  --wrap:1312px;
  --gutter:32px;
  --header-height:72px;
  --anchor-offset:88px;
  --toc-offset:152px;
  --duration-fast:.15s;
  --duration-reveal:.35s;
  --grain-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='paper'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.82' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Cpath filter='url(%23paper)' opacity='.035' d='M0 0h160v160H0z'/%3E%3C/svg%3E");
}
*,*::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(--bg);color:var(--text);font-family:var(--font-body);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased}
button,input,select,textarea{font:inherit}
button,summary{cursor:pointer}
button{color:inherit}
a{color:var(--accent);text-underline-offset:4px}
img,svg{vertical-align:middle}
img{max-width:100%;height:auto}
svg{flex-shrink:0}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
[hidden]{display:none!important}
h1,h2,h3,h4{font-family:var(--font-display);color:var(--text);line-height:1.25;text-wrap:balance}
h1{font-size:clamp(52px,4.5vw,64px);font-weight:var(--weight-heavy);letter-spacing:-.02em}
h2{font-size:clamp(28px,3vw,40px);font-weight:var(--weight-heavy);letter-spacing:-.02em}
h3{font-size:22px;font-weight:var(--weight-bold)}
p{margin:0 0 1.25em}
code{font-family:var(--font-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}
button:disabled,.btn[aria-disabled="true"]{opacity:.55;cursor:not-allowed;box-shadow:none}
.wrap{width:100%;max-width:calc(var(--wrap) + var(--gutter)*2);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:64px;padding-bottom:64px}
.reading-wrap{max-width:840px;margin-inline:auto;padding-inline:var(--gutter)}
.no-break{white-space:nowrap}
.mono{font-family:var(--font-mono);letter-spacing:-.02em;font-variant-numeric:tabular-nums}
.muted{color:var(--muted)}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.panel{padding:24px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-sm);box-shadow:inset 0 1px 0 var(--hi),var(--shadow-near),var(--shadow-ink)}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.grid>*{min-width:0}
.badge,.tag{display:inline-block;max-width:100%;padding:3px 10px;border:1px solid var(--border);border-radius:var(--r-pill);background:var(--panel);color:var(--muted);font-size:12px;font-weight:var(--weight-semibold);overflow-wrap:anywhere;vertical-align:middle}
.badge-accent{background:var(--accent-tint);color:var(--accent-dark);border-color:var(--accent)}
.badge-marker{background:var(--marker-soft);color:var(--text)}
.mark{background:linear-gradient(176deg,transparent 54%,var(--marker) 54%,var(--marker) 93%,transparent 93%);padding:0 .05em;margin:0 -.02em;-webkit-box-decoration-break:clone;box-decoration-break:clone}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:52px;padding:10px 28px;border:1px solid transparent;border-radius:var(--r-pill);font-size:16px;font-weight:var(--weight-bold);line-height:1.4;text-decoration:none;transition:background-color var(--duration-fast),border-color var(--duration-fast),transform var(--duration-fast)}
.btn svg{width:18px;height:18px;display:block}
.btn-primary{background:linear-gradient(180deg,var(--accent),var(--accent-dark));color:var(--white);box-shadow:inset 0 1px 0 var(--hi-on-accent),var(--shadow-cta)}
.btn-primary:hover{transform:translateY(-1px)}
.btn-ghost,.btn-secondary{background:var(--panel);color:var(--text);border-color:var(--border-strong)}
.btn-ghost:hover,.btn-secondary:hover{border-color:var(--accent);color:var(--accent-dark)}
.btn-small{min-height:40px;padding:8px 18px;font-size:14px}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin:0 0 24px}
.topbar{position:relative;z-index:40}
.topbar-in{display:flex;align-items:center;gap:36px;height:var(--header-height);flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;flex:none;color:var(--text)}
.brand img{width:32px;height:32px;flex:none;display:block}
.brand-en{font-family:var(--font-display);font-weight:var(--weight-heavy);font-size:20px;letter-spacing:-.025em}
.nav{flex:1;min-width:0}
.nav ul{display:flex;align-items:center;gap:2px;margin:0;padding:0;list-style:none}
.nav a{display:block;padding:7px 14px;border-radius:var(--r-pill);font-size:15px;font-weight:var(--weight-medium);color:var(--muted);text-decoration:none;white-space:nowrap;transition:color var(--duration-fast),background-color var(--duration-fast)}
.nav a:hover{color:var(--text);background:color-mix(in srgb,var(--panel-2) 60%,transparent)}
.nav a[aria-current="page"]{background:var(--accent-tint);color:var(--accent-dark);font-weight:var(--weight-bold);box-shadow:inset 0 0 0 1px color-mix(in srgb,var(--accent) 16%,transparent)}
.top-actions{margin-left:auto;display:flex;align-items:center;gap:22px;flex-shrink:0}
.lang-picker{position:relative}
.lang{appearance:none;border:0;background:none;padding:6px 0;min-height:32px;font:inherit;font-size:14px;color:var(--muted);cursor:pointer;display:inline-flex;align-items:center;justify-content:center;gap:4px;width:auto;white-space:nowrap}
.lang:hover{color:var(--text)}
.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(--shadow-chip)}
.lang-panel a{display:flex;align-items:center;min-height:40px;padding:8px 12px;color:var(--text);text-decoration:none;border-radius:var(--r-xs);white-space:nowrap}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--accent-tint);color:var(--accent-dark)}
.top-link{font-size:15px;font-weight:var(--weight-bold);color:var(--accent);text-decoration:none;white-space:nowrap}
.top-link:hover{text-decoration:underline}
.btn-login{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:8px 22px;border-radius:var(--r-pill);background:var(--accent);color:var(--white);font-size:15px;font-weight:var(--weight-bold);text-decoration:none;white-space:nowrap;box-shadow:inset 0 1px 0 var(--hi-on-accent),var(--shadow-cta);transition:background-color var(--duration-fast)}
.btn-login:hover{background:var(--accent-dark)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:5px;min-width:44px;min-height:44px;padding:10px;border:1px solid var(--border);border-radius:var(--r-sm);background:var(--panel);color:var(--accent)}
.menu-line{display:block;width:20px;height:2px;background:currentColor}
.menu-drawer{position:fixed;z-index:50;top:var(--header-height);right:0;left:0;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;background:var(--panel);padding:16px var(--gutter) 32px;border-top:1px solid var(--border)}
.menu-drawer ul{list-style:none;margin:0;padding:0}
.menu-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;color:var(--text);text-decoration:none;border-radius:var(--r-sm)}
.menu-drawer a:hover,.menu-drawer a[aria-current]{background:var(--accent-tint);color:var(--accent-dark)}
.drawer-languages{margin-top:16px;padding-top:16px;border-top:1px solid var(--border)}
.menu-veil{position:fixed;z-index:45;inset:var(--header-height) 0 0;border:0;background:var(--veil)}
html.nav-open{overflow:hidden}
html.nav-open .topbar{z-index:60}
.site-footer{border-top:1px solid var(--border);background:var(--panel-2);padding-top:48px;padding-bottom:24px}
.footer-grid{display:grid;grid-template-columns:1.35fr 1fr 1fr;gap:48px}
.footer-grid>*{min-width:0}
.footer-intro{margin-top:16px;max-width:30em;color:var(--muted);font-size:14px}
.footer-title{margin:0 0 14px;font-size:15px;font-weight:var(--weight-bold)}
.footer-links{display:flex;flex-wrap:wrap;gap:8px 18px;list-style:none;padding:0;margin:0}
.footer-links a{display:inline-flex;align-items:center;min-height:28px;color:var(--text);font-size:14px;text-decoration:none}
.footer-links a:hover{color:var(--accent);text-decoration:underline}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:32px;padding-top:20px;border-top:1px solid var(--border)}
.footer-languages a{display:inline-flex;align-items:center;min-height:32px;font-size:14px}
.footer-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px 24px;margin-top:20px;font-size:13px;color:var(--muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:16px}
.footer-legal a{display:inline-flex;min-height:24px;align-items:center;color:var(--muted)}
.reveal{transition:opacity var(--duration-reveal),transform var(--duration-reveal)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{display:block;position:static;min-width:0;max-width:100%;overflow:hidden;margin:24px 0}
#server-status+*{margin-top:24px}
.decor-section{position:relative;overflow-x:clip;isolation:isolate}
[data-parallax-decor]{pointer-events:none;max-width:100%}
@media(max-width:1250px){
  .topbar-in{gap:20px}
  .nav a{padding-inline:9px;font-size:14px}
  .top-actions{gap:14px}
}
@media(max-width:1100px){
  .nav{display:none}
  .menu-toggle{display:inline-flex}
  .top-actions{margin-left:auto}
  .footer-grid{gap:24px}
}
@media(min-width:1101px){
  .menu-drawer,.menu-veil{display:none!important}
}
@media(max-width:768px){
  h1{font-size:40px;line-height:1.15}
  .grid{grid-template-columns:1fr}
  .section{padding-top:40px;padding-bottom:40px}
  .footer-grid{grid-template-columns:1fr}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .wrap{width:100%;padding-inline:var(--gutter)}
  .topbar-in{gap:10px}
  .top-actions{gap:8px;margin-left:auto}
  .brand{gap:6px}
  .brand-en{font-size:18px}
  .brand img{width:28px;height:28px}
  .top-link{display:none}
  .btn-login{padding:8px 14px;font-size:14px}
  .lang{font-size:12px}
  .menu-toggle{padding:8px}
  .btn{padding-inline:20px}
  .tilt,.note{transform:none}
  .decor-section,[data-parallax-decor]{max-width:100%}
  .panel{padding:20px}
}
@media(max-width:360px){
  .brand-en{font-size:16px}
  .brand img{width:24px;height:24px}
  .top-actions{gap:4px}
  .btn-login{padding-inline:10px}
  .lang{font-size:11px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}