:root{
  color-scheme:light;
  --bg:#FAF3E6;
  --hero-top:#FDF8EE;
  --hero-bottom:#F3E8D5;
  --panel:#FFFCF6;
  --panel-2:#F2E7D3;
  --border:#E4D6BE;
  --accent:#1A5F7A;
  --accent-dark:#0F4256;
  --sky:#2FA8C9;
  --sun:#F7DD8A;
  --coral:#EE6C5B;
  --text:#2A2118;
  --muted:#6E6152;
  --success:#2E9E6B;
  --warn:#D9961E;
  --error:#C8442F;
  --white:#FFFFFF;
  --transparent:transparent;
  --mask-ink:#000000;
  --tint-accent:#D7E6EB;
  --tint-sky:#DDF0F5;
  --tint-sun:#FBEEC4;
  --tint-sand:#EEE1C8;
  --flag-red:#D7303A;
  --flag-blue:#24418F;
  --flag-white:#FFFFFF;
  --flag-ring:rgba(42,33,24,.16);
  --accent-rgb:26,95,122;
  --accent-dark-rgb:15,66,86;
  --sky-rgb:47,168,201;
  --ink-rgb:42,33,24;
  --white-rgb:255,255,255;
  --success-rgb:46,158,107;
  --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 Kaku Gothic ProN','Malgun Gothic','Microsoft YaHei',system-ui,sans-serif;
  --font-mono:'JetBrains Mono','SFMono-Regular',Menlo,Consolas,'Liberation Mono',monospace;
  --weight-body:400;
  --weight-medium:500;
  --weight-semibold:600;
  --weight-bold:700;
  --weight-display:800;
  --r-pill:999px;
  --r-card:28px;
  --r-small:14px;
  --r-notice:24px;
  --r-menu:24px;
  --r-float:20px;
  --r-stage:40px;
  --r-core:36px;
  --r-core-sm:26px;
  --r-flag:4px;
  --r-circle:50%;
  --r-square:0;
  --gutter:24px;
  --content-width:1248px;
  --head-height:64px;
  --anchor-offset:80px;
  --toc-offset:144px;
  --space-1:8px;
  --space-2:16px;
  --space-3:24px;
  --space-4:32px;
  --space-6:48px;
  --space-8:64px;
  --space-9:72px;
  --hl:inset 0 1px 0 rgba(var(--white-rgb),.95);
  --shadow-soft:0 28px 48px rgba(var(--accent-rgb),.12),0 2px 6px rgba(var(--accent-rgb),.05);
  --shadow-float:0 18px 40px rgba(var(--accent-rgb),.14),0 2px 4px rgba(var(--accent-rgb),.05);
  --gradient-brand:linear-gradient(135deg,var(--accent),var(--sky));
  --ease-ui:cubic-bezier(.2,.7,.3,1);
  --time-ui:.2s;
  --time-reveal:.35s;
  --grain:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='g'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 .16 0 0 0 0 .13 0 0 0 0 .09 0 0 0 1 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23g)'/%3E%3C/svg%3E");
}
*,*::before,*::after{box-sizing:border-box}
html{background:var(--bg);scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
body{margin:0;font-family:var(--font-body);font-size:16px;font-weight:var(--weight-body);line-height:1.6;color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
body::after{content:"";position:fixed;inset:0;background-image:var(--grain);opacity:.03;pointer-events:none;z-index:80}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
button,a,summary{touch-action:manipulation}
:focus-visible{outline:2px solid var(--sky);outline-offset:3px;border-radius:var(--r-small)}
[hidden]{display:none!important}
h1,h2,h3,h4{font-family:var(--font-display);color:var(--text);text-wrap:balance;overflow-wrap:break-word}
h1{margin:16px 0 0;font-weight:var(--weight-display);font-size:clamp(52px,4.45vw,64px);line-height:1.1;letter-spacing:-.02em}
h2{font-size:clamp(28px,3vw,40px);line-height:1.25;letter-spacing:-.02em;font-weight:var(--weight-bold);margin:0 0 24px}
h3{font-size:22px;line-height:1.4;font-weight:var(--weight-bold);margin:0 0 16px}
p{margin:0 0 16px}
small{font-size:13px}
strong,b{font-weight:var(--weight-bold)}
code,kbd,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere;font-size:.9em}
pre{max-width:100%;overflow-x:auto;padding:24px;border-radius:var(--r-small);background:var(--panel-2)}
pre code{overflow-wrap:normal;white-space:pre}
hr{border:0;border-top:1px solid var(--border);margin:32px 0}
.wrap{width:100%;max-width:var(--content-width);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:var(--space-9);padding-bottom:var(--space-9)}
.section-head{max-width:760px;margin-bottom:32px}
.section-head p,.muted{color:var(--muted)}
.no-break{white-space:nowrap}
.kw{background:linear-gradient(120deg,var(--accent) 8%,var(--sky) 92%);-webkit-background-clip:text;background-clip:text;color:var(--transparent);padding-right:.02em}
.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}
.grid{display:grid;gap:24px}
.grid>*{min-width:0}
.grid-two{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-three{grid-template-columns:repeat(3,minmax(0,1fr))}
.panel,.card{min-width:0;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-card);padding:32px;box-shadow:var(--hl),var(--shadow-soft)}
.card{transition:transform var(--time-ui),box-shadow var(--time-ui)}
.card:hover{transform:translateY(-2px)}
.panel-inset{background:var(--panel-2);border-radius:var(--r-card);padding:24px;min-width:0}
.prose{max-width:840px;min-width:0}
.reading-wrap .prose{margin-inline:auto}
.prose p,.prose li{overflow-wrap:break-word}
.prose h2{margin-top:48px}
.prose h3{margin-top:32px}
.prose a:not(.btn){color:var(--accent);text-decoration:underline;text-underline-offset:3px}
.prose li+li{margin-top:8px}
.prose img{border-radius:var(--r-small)}
.btn{display:inline-flex;align-items:center;justify-content:center;min-width:148px;min-height:48px;padding:10px 30px;border-radius:var(--r-pill);font-size:16px;font-weight:var(--weight-bold);letter-spacing:.01em;line-height:1.5;gap:8px;border:0;flex-shrink:0;white-space:nowrap;transition:transform var(--time-ui),box-shadow var(--time-ui),background-color var(--time-ui)}
.btn-solid,.btn-primary{color:var(--white);background:var(--gradient-brand);box-shadow:inset 0 1px 0 rgba(var(--white-rgb),.35),0 12px 28px rgba(var(--accent-rgb),.28)}
.btn-solid:hover,.btn-primary:hover{transform:translateY(-2px);box-shadow:inset 0 1px 0 rgba(var(--white-rgb),.35),0 16px 32px rgba(var(--accent-rgb),.32)}
.btn-line,.btn-secondary{color:var(--accent);border:2px solid var(--accent);background:rgba(var(--white-rgb),.4)}
.btn-line:hover,.btn-secondary:hover{transform:translateY(-2px);background:var(--panel)}
.btn:active{transform:translateY(0)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.5;cursor:not-allowed;box-shadow:none;transform:none}
.btn-small{min-height:40px;min-width:0;font-size:14px;padding:8px 20px}
.cta-row{margin-top:24px;display:flex;justify-content:center;flex-wrap:wrap;gap:12px}
#site-header{position:relative;z-index:50;min-height:var(--head-height)}
.site-head{position:relative;z-index:52;height:var(--head-height);display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:nowrap}
.brand{display:flex;align-items:center;gap:10px;flex:none}
.brand-mark{width:34px;height:34px;border-radius:var(--r-circle);flex-shrink:0;box-shadow:0 6px 14px rgba(var(--accent-rgb),.22)}
.brand-en{font-family:var(--font-display);font-weight:var(--weight-display);font-size:19px;letter-spacing:-.02em;color:var(--text)}
.desktop-nav{flex:1;min-width:0;display:flex;justify-content:center}
.nav{display:flex;align-items:center;gap:2px;list-style:none;margin:0;padding:0}
.nav-link{display:inline-flex;align-items:center;justify-content:center;gap:4px;min-height:38px;padding:0 14px;border-radius:var(--r-pill);font-size:15px;font-weight:var(--weight-medium);color:var(--text);background:var(--transparent);border:0;cursor:pointer;white-space:nowrap;transition:background-color var(--time-ui),color var(--time-ui)}
.nav-link:hover{background:rgba(var(--accent-rgb),.06);color:var(--accent-dark)}
.nav-link[aria-current="page"]{color:var(--accent-dark);font-weight:var(--weight-bold);background:rgba(var(--accent-rgb),.08)}
.caret{font-size:11px;color:var(--muted)}
.more{position:relative}
.more>summary{list-style:none}
.more>summary::-webkit-details-marker{display:none}
.menu{position:absolute;left:50%;top:calc(100% + 10px);z-index:54;width:264px;padding:10px;border-radius:var(--r-menu);background:var(--panel);border:1px solid var(--border);box-shadow:var(--shadow-float),var(--hl);display:none}
.more.is-open .menu,.more[open] .menu{display:block;transform:translateX(-50%)}
.menu-label{margin:6px 10px 4px;font-size:11px;font-weight:var(--weight-bold);letter-spacing:.06em;color:var(--muted)}
.menu a{display:flex;flex-direction:column;padding:8px 10px;border-radius:var(--r-small);min-height:44px;transition:background-color var(--time-ui)}
.menu a:hover{background:var(--panel-2)}
.menu a b{font-size:14px;line-height:20px}
.menu a span{font-size:12px;color:var(--muted);line-height:18px}
.menu a[aria-current="page"]{background:var(--tint-accent)}
.head-tools{display:flex;align-items:center;gap:8px;flex-shrink:0}
.language{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;min-height:40px;padding:0 12px;border-radius:var(--r-pill);border:0;background:var(--transparent);font-size:14px;color:var(--muted);cursor:pointer;white-space:nowrap}
.lang span{white-space:nowrap}
.lang:hover{background:rgba(var(--accent-rgb),.06)}
.lang svg{display:block;width:16px;height:16px}
.lang-panel{display:none;position:absolute;right:0;top:calc(100% + 10px);z-index:55;width:192px;padding:8px;border-radius:var(--r-menu);border:1px solid var(--border);background:var(--panel);box-shadow:var(--shadow-float)}
.language.is-open .lang-panel{display:block}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-small)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--panel-2);color:var(--accent-dark)}
.login{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:0 22px;border-radius:var(--r-pill);font-size:15px;font-weight:var(--weight-bold);color:var(--accent-dark);background:var(--panel);border:1.5px solid rgba(var(--accent-rgb),.35);box-shadow:var(--hl),0 4px 12px rgba(var(--accent-rgb),.08);white-space:nowrap;transition:transform var(--time-ui),border-color var(--time-ui)}
.login:hover{transform:translateY(-1px);border-color:var(--accent)}
.hamburger{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;padding:10px;background:var(--transparent);border:1px solid var(--border);border-radius:var(--r-pill)}
.hamburger-line{display:block;width:20px;height:2px;background:currentColor;border-radius:var(--r-pill)}
.mobile-drawer{display:none;position:fixed;z-index:51;top:var(--head-height);right:0;left:0;height:calc(100dvh - var(--head-height));max-height:calc(100dvh - var(--head-height));overflow-y:auto;overscroll-behavior:contain;background:var(--panel);padding:16px var(--gutter) 32px}
.mobile-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 16px;border-radius:var(--r-small)}
.mobile-drawer a:hover,.mobile-drawer a[aria-current="page"]{background:var(--panel-2);color:var(--accent-dark)}
.drawer-label{margin:24px 16px 8px;color:var(--muted);font-size:13px;font-weight:var(--weight-bold)}
.nav-veil{display:none;position:fixed;z-index:49;inset:var(--head-height) 0 0;background:rgba(var(--ink-rgb),.2);border:0}
html.nav-open{overflow:hidden}
.site-footer{margin-top:48px;border-top:1px solid var(--border);background:var(--panel-2);padding-top:56px;padding-bottom:24px}
.footer-grid{display:grid;grid-template-columns:1.15fr 1fr 1fr;gap:48px}
.footer-grid>*{min-width:0}
.footer-brand p{max-width:320px;margin-top:20px;color:var(--muted);font-size:14px}
.footer-title{font-size:15px;margin-bottom:16px}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 16px}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:32px;font-size:14px;overflow-wrap:anywhere}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{color:var(--accent);text-decoration:underline;text-underline-offset:3px}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 24px;margin-top:32px}
.footer-languages a[aria-current="true"]{font-weight:var(--weight-bold);color:var(--accent-dark)}
.footer-bottom{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px;margin-top:24px;padding-top:24px;border-top:1px solid var(--border);font-size:13px;color:var(--muted)}
.footer-legal{display:flex;gap:20px;flex-wrap:wrap}
.reveal{transition:opacity var(--time-reveal) var(--ease-ui),transform var(--time-reveal) var(--ease-ui)}
.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%;min-height:80px;overflow:hidden;margin-top:24px;margin-bottom:32px}
#server-status+*{margin-top:32px}
#server-status>*{min-width:0;max-width:100%}
@media(max-width:1100px){
  .site-head{gap:16px}
  .nav-link{padding-inline:10px}
  .lang{padding-inline:8px}
  h1{font-size:56px}
}
@media(max-width:960px){
  .desktop-nav{display:none}
  .head-tools{margin-left:auto}
  .hamburger{display:flex}
  .mobile-drawer.is-open{display:block}
  .nav-veil.is-open{display:block}
  html.nav-open .site-head{background:var(--panel)}
  .footer-grid{gap:24px}
}
@media(max-width:768px){
  h1{font-size:32px;line-height:1.2}
  h2{font-size:28px}
  .section{padding-top:48px;padding-bottom:48px}
  .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:16px}
  .no-break{white-space:normal}
  .tilt,.tilted,[data-tilt]{transform:none}
  .grid-two{grid-template-columns:1fr}
  .panel,.card{padding:24px}
  .site-head{gap:8px}
  .brand{gap:6px}
  .brand-mark{width:28px;height:28px}
  .brand-en{font-size:16px}
  .head-tools{gap:4px;margin-left:auto}
  .lang{font-size:12px;padding-inline:6px;gap:4px}
  .lang svg{display:none}
  .login{font-size:13px;padding-inline:12px}
  .footer-grid{grid-template-columns:1fr;gap:24px}
  .footer-brand{grid-column:auto}
  .footer-bottom{align-items:flex-start;flex-direction:column}
  .cta-row{gap:10px}
  .btn{padding-inline:24px;min-width:132px}
  .stripe-halo,.decorative-halo{max-width:100%}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}