:root {
  --bg:#F9F2E5;
  --bg-top:#FCF8EF;
  --bg-bottom:#F4EBDA;
  --panel:#FFFCF6;
  --panel-2:#F1E8D6;
  --white:#FFFEFA;
  --border:#E3D6BF;
  --border-soft:#ECE2CF;
  --ink-line:#3B2F24;
  --accent:#12706E;
  --accent-dark:#0B4D4B;
  --accent-soft:#E1EEEA;
  --teal-light:#4E9C96;
  --teal-mist:#C6E0D9;
  --teal-mist-2:#E5F0EB;
  --accent-07:rgba(18,112,110,.07);
  --accent-10:rgba(18,112,110,.10);
  --accent-18:rgba(18,112,110,.18);
  --accent-30:rgba(18,112,110,.30);
  --violet:#8C8FE0;
  --violet-light:#C0C2F2;
  --lime:#DCE98E;
  --lime-light:#F1F6CC;
  --text:#2A2119;
  --muted:#6E6152;
  --faint:#9A8B78;
  --on-accent:#FFFCF6;
  --success:#2F8F5B;
  --warn:#C48614;
  --error:#C2412D;
  --flag-red:#C2412D;
  --flag-white:#FFFFFF;
  --flag-blue:#34427C;
  --flag-edge:rgba(42,33,25,.16);
  --hl:rgba(255,255,255,.88);
  --frost:rgba(255,252,246,.30);
  --sheen:rgba(255,255,255,.13);
  --sheen-ink:rgba(255,255,255,.42);
  --dot-light:rgba(255,255,255,.16);
  --dot-ink:rgba(42,33,25,.06);
  --paper-ink:rgba(42,33,25,.03);
  --bar-bg:rgba(252,248,239,.90);
  --veil:rgba(42,33,25,.32);
  --mask-solid:#000;
  --clear:transparent;
  --shadow-card:inset 0 1px 0 var(--hl),0 30px 60px -30px rgba(18,112,110,.30),0 10px 26px -14px rgba(18,112,110,.10);
  --shadow-float:inset 0 1px 0 var(--hl),0 0 0 1px rgba(227,214,191,.55),0 16px 34px -12px rgba(11,77,75,.30),0 3px 8px rgba(11,77,75,.08);
  --shadow-chip:0 12px 26px -12px rgba(18,112,110,.34),0 2px 5px rgba(42,33,25,.06);
  --shadow-btn:inset 0 1px 0 rgba(255,255,255,.22),0 12px 24px -12px rgba(11,77,75,.55);
  --r-btn:8px;
  --r-small:6px;
  --r-float:14px;
  --r-card:24px;
  --r-stage:23px;
  --r-mark:10px;
  --r-pill:999px;
  --r-dot:50%;
  --r-zero:0;
  --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","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --gutter:24px;
  --content:1248px;
  --header-height:72px;
  --toc-offset:88px;
  --anchor-offset:160px;
  --space-1:8px;
  --space-2:16px;
  --space-3:24px;
  --space-4:32px;
  --space-5:40px;
  --space-6:48px;
  --space-8:64px;
  --space-9:72px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:88px}
html.nav-open{overflow:hidden}
body{margin:0;background:var(--bg);color:var(--text);font:400 15px/1.6 var(--font-body);-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
body::before{content:"";position:fixed;inset:0;pointer-events:none;z-index:-1;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Cpath filter='url(%23n)' opacity='.03' d='M0 0h160v160H0z'/%3E%3C/svg%3E")}
a{color:inherit;text-underline-offset:3px}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
button,a,input,select,textarea,summary{touch-action:manipulation}
button{color:inherit}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
[hidden]{display:none!important}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
::selection{background:var(--accent-18);color:var(--text)}
h1,h2,h3,h4{font-family:var(--font-display);line-height:1.25;text-wrap:balance}
h1,h2,h3{display:block}
h1{font-size:clamp(52px,4.6vw,68px);font-weight:900;line-height:1.1;letter-spacing:-.02em}
h2{font-size:32px;font-weight:800;letter-spacing:-.02em}
h3{font-size:21px;font-weight:800}
p{margin-top:0}
code{font-family:var(--font-mono);overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:24px;border:1px solid var(--border);border-radius:var(--r-float);background:var(--panel-2)}
pre code{overflow-wrap:normal;white-space:pre}
.wrap{width:100%;max-width:var(--content);margin-inline:auto;padding-inline:var(--gutter)}
.wrap>*{min-width:0}
.section{padding-top:64px;padding-bottom:64px}
.section-title{margin:0 0 24px}
.section-intro{max-width:760px;color:var(--muted);font-size:18px}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.no-break{white-space:nowrap}
.muted{color:var(--muted)}
.defs{position:absolute;width:0;height:0;overflow:hidden}
.panel,.card{padding:24px;border:1px solid var(--border);border-radius:var(--r-card);background:var(--panel);box-shadow:var(--shadow-card);min-width:0}
.grid-2,.grid-3,.grid-5{display:grid;gap:24px}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-5{grid-template-columns:repeat(5,minmax(0,1fr))}
.grid-2>*,.grid-3>*,.grid-5>*{min-width:0}
.prose{max-width:820px;margin-inline:auto;overflow-wrap:break-word}
.prose p,.prose li{line-height:1.9}
.prose h2{margin-top:48px}
.prose h3{margin-top:32px}
.prose a{color:var(--accent-dark)}
.prose img{border-radius:var(--r-float)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;min-height:52px;padding:10px 26px;border:1px solid var(--clear);border-radius:var(--r-btn);font:700 16px/1.4 var(--font-body);text-decoration:none;white-space:nowrap;flex-shrink:0;transition:background-color .15s ease,border-color .15s ease}
.btn svg{width:19px;height:19px}
.btn-primary{background:linear-gradient(180deg,var(--accent),var(--accent-dark));color:var(--on-accent);box-shadow:var(--shadow-btn)}
.btn-primary:hover,.btn-primary.is-hover{background:var(--accent-dark)}
.btn-primary:active{transform:translateY(1px)}
.btn-ghost,.btn-secondary{background:var(--white);color:var(--text);border-color:var(--ink-line);font-weight:600}
.btn-ghost svg,.btn-secondary svg{color:var(--accent)}
.btn-ghost:hover,.btn-secondary:hover{background:var(--panel-2)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.5;cursor:not-allowed}
.btn-small{min-height:36px;padding:6px 14px;font-size:13px}
.cta-row{display:flex;justify-content:center;align-items:center;gap:12px;margin:0 0 14px}
.arr{font-weight:500}
.topbar{position:relative;z-index:60;background:var(--bar-bg);border-bottom:1px solid var(--border-soft);backdrop-filter:saturate(1.2) blur(8px)}
.topbar-in{height:var(--header-height);display:flex;align-items:center;gap:24px;flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:10px;text-decoration:none;flex:0 0 auto;min-height:36px}
.brand-logo{width:34px;height:34px;border-radius:var(--r-mark)}
.brand-name{font:800 19px/1.2 var(--font-display);letter-spacing:-.02em}
.mainnav{flex:1 1 auto;min-width:0}
.mainnav ul{display:flex;flex-wrap:nowrap;align-items:center;justify-content:center;list-style:none;margin:0;padding:0;gap:0 2px}
.mainnav a{display:inline-flex;align-items:center;gap:6px;min-height:36px;padding:6px 10px;border-radius:var(--r-btn);font-size:14px;font-weight:500;color:var(--muted);text-decoration:none;white-space:nowrap}
.mainnav a svg{width:16px;height:16px}
.mainnav a:hover{background:var(--panel-2);color:var(--text)}
.mainnav a[aria-current="page"]{color:var(--accent-dark);background:var(--accent-soft);font-weight:600}
.topbar-end{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.lang-switch{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:36px;width:auto;padding:6px 12px;border:1px solid var(--border);border-radius:var(--r-btn);background:var(--panel);color:var(--muted);font:500 13.5px/1 var(--font-body)}
.lang svg{width:15px;height:15px}
.lang-text{white-space:nowrap}
.caret{font-size:10px;color:var(--faint)}
.lang-panel{position:absolute;right:0;top:calc(100% + 8px);z-index:90;min-width:180px;padding:8px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-float);box-shadow:var(--shadow-float)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;text-decoration:none;border-radius:var(--r-btn)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--accent-soft);color:var(--accent-dark)}
.login{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:36px;padding:6px 18px;border-radius:var(--r-btn);background:var(--accent-dark);color:var(--on-accent);font-size:14px;font-weight:700;text-decoration:none;box-shadow:inset 0 1px 0 var(--sheen);white-space:nowrap}
.login svg{width:15px;height:15px}
.login:hover{background:var(--accent)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;border:1px solid var(--border);border-radius:var(--r-btn);background:var(--panel)}
.menu-toggle svg{width:20px;height:20px}
.mobile-drawer{position:fixed;top:var(--header-height);left:0;right:0;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));z-index:55;overflow-y:auto;overscroll-behavior:contain;padding:16px var(--gutter) 32px;background:var(--panel)}
.mobile-drawer ul{list-style:none;margin:0;padding:0}
.mobile-drawer a{display:flex;align-items:center;gap:12px;width:100%;min-height:48px;padding:12px 16px;text-decoration:none;border-radius:var(--r-btn)}
.mobile-drawer a svg{width:18px;height:18px}
.mobile-drawer a:hover,.mobile-drawer a[aria-current="page"]{background:var(--accent-soft);color:var(--accent-dark)}
.drawer-languages{border-top:1px solid var(--border);margin-top:16px;padding-top:16px}
.menu-veil{position:fixed;inset:var(--header-height) 0 0;z-index:50;border:0;background:var(--veil)}
.site-footer{padding-top:48px;padding-bottom:24px;background:var(--panel-2);border-top:1px solid var(--border)}
.footer-grid{display:grid;grid-template-columns:1.35fr 1fr 1fr 1fr;gap:32px}
.footer-grid>*{min-width:0}
.footer-title{font-size:14px;font-weight:700;margin:0 0 12px}
.footer-description{max-width:290px;color:var(--muted);margin:16px 0}
.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;text-decoration:none;color:var(--muted);overflow-wrap:anywhere}
.footer-links a:hover{color:var(--accent-dark);text-decoration:underline}
.footer-bottom{margin-top:32px;padding-top:20px;border-top:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:13px;color:var(--muted)}
.legal-links{display:flex;gap:16px;flex-wrap:wrap}
.legal-links a{display:inline-flex;align-items:center;min-height:28px}
.reveal{transition:opacity .35s ease,transform .35s 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}
.decor-region{position:relative;overflow-x:clip}
.decor-region [data-parallax-decor]{max-width:100%;pointer-events:none}
@media(max-width:1320px){
  .topbar-in{gap:16px}
  .mainnav a{padding-inline:5px;font-size:12px;gap:4px}
}
@media(max-width:1100px){
  .mainnav{display:none}
  .topbar-end{margin-left:auto}
  .menu-toggle{display:inline-flex}
  .grid-5{grid-template-columns:repeat(3,minmax(0,1fr))}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(min-width:1101px){
  .mobile-drawer,.menu-veil{display:none!important}
}
@media(max-width:768px){
  h1{font-size:clamp(28px,6vw,40px)}
  .grid-3{grid-template-columns:1fr}
  .section{padding-top:40px;padding-bottom:40px}
}
@media(max-width:640px){
  :root{--gutter:16px;--header-height:64px}
  .no-break{white-space:normal}
  .wrap{width:100%;padding-inline:var(--gutter)}
  .topbar-in{gap:8px}
  .brand{gap:7px}
  .brand-logo{width:30px;height:30px}
  .brand-name{font-size:17px}
  .topbar-end{gap:6px;margin-left:auto}
  .lang{padding-inline:9px;min-width:36px}
  .lang .lang-text,.lang .caret{display:none}
  .login{padding-inline:12px}
  .login svg{display:none}
  .grid-2,.grid-5,.footer-grid{grid-template-columns:1fr}
  h2{font-size:26px}
  .section-intro{font-size:16px}
  .tilt,.tag-ch{transform:none}
  .decor-region [data-parallax-decor]{max-width:100%;transform:none}
  .panel,.card{padding:20px}
  .cta-row{flex-direction:column;align-items:stretch}
  .cta-row .btn{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}
}.mainnav ul{justify-content:safe center}
@media(min-width:1321px){
  html:is([lang="en"],[lang="ja"]) .topbar-in{gap:16px}
  html:is([lang="en"],[lang="ja"]) .mainnav a{padding-inline:5px;font-size:13px}
}