:root{
  --bg:#E4EAF2;
  --bg-panel:#F6F8FC;
  --bg-panel-2:#D8E0EC;
  --border:#C9D3E2;
  --accent:#E05A2B;
  --accent-dark:#B8431D;
  --text:#1A2233;
  --text-muted:#566178;
  --success:#1F8A5B;
  --warn:#C98A12;
  --error:#C8323A;
  --white:#FFFFFF;
  --wash:#DDE4EE;
  --wash-soft:rgba(175,188,208,.03);
  --ink-2:#2E3C58;
  --on-muted:#AEB9CC;
  --wall-top:#EEF2F8;
  --wall-bottom:#DCE4EF;
  --sky:#D6E2F1;
  --shelf-back-a:#E2E8F1;
  --shelf-back-b:#D3DCE8;
  --board-hi:#D6DEEA;
  --board:#BAC7D9;
  --board-lo:#9DACC2;
  --spine-a:#C9D3E2;
  --spine-b:#AFBCD0;
  --spine-hi:rgba(255,255,255,.45);
  --desk-top:#E8E2DA;
  --desk-bottom:#DCD3C8;
  --desk-edge:#F7F3EE;
  --desk-front:#CEC3B5;
  --desk-front-hi:#EFE9E1;
  --leaf-light:#A2B5AA;
  --leaf-dark:#71887C;
  --pot-hi:#FAFBFD;
  --pot:#E3E8F0;
  --pot-lo:#BEC8D7;
  --alu-1:#F2F4F7;
  --alu-2:#C9CFD8;
  --alu-3:#A6AFBD;
  --slate-1:#4A5468;
  --slate-2:#283041;
  --slate-hi:rgba(255,255,255,.18);
  --screen-1:#2B3B58;
  --screen-2:#131A28;
  --flag-red:#C8323A;
  --flag-white:#FFFFFF;
  --flag-navy:#1A2233;
  --beam:rgba(246,248,252,.5);
  --beam-0:rgba(246,248,252,0);
  --fog:rgba(246,248,252,.72);
  --fog-0:rgba(246,248,252,0);
  --glow:rgba(255,255,255,.9);
  --glow-0:rgba(255,255,255,0);
  --glare:rgba(255,255,255,.07);
  --glare-0:rgba(255,255,255,0);
  --sheen:rgba(255,255,255,.5);
  --sheen-0:rgba(255,255,255,0);
  --chip-bg:rgba(246,248,252,.84);
  --tape:rgba(175,188,208,.5);
  --line-soft:rgba(201,211,226,.75);
  --ink-00:rgba(26,34,51,0);
  --ink-06:rgba(26,34,51,.06);
  --ink-08:rgba(26,34,51,.08);
  --ink-10:rgba(26,34,51,.10);
  --ink-12:rgba(26,34,51,.12);
  --ink-14:rgba(26,34,51,.14);
  --ink-18:rgba(26,34,51,.18);
  --veil:rgba(26,34,51,.38);
  --shadow-deep:rgba(8,12,22,.38);
  --accent-10:rgba(224,90,43,.10);
  --accent-18:rgba(224,90,43,.18);
  --success-18:rgba(31,138,91,.18);
  --btn-hi:rgba(255,255,255,.22);
  --font-display:"Iowan Old Style","Palatino Linotype",Palatino,Georgia,"Songti SC","STSong","Noto Serif CJK SC","Source Han Serif SC",serif;
  --font-body:"Inter","Noto Sans SC",-apple-system,"PingFang SC","Hiragino Sans","Microsoft YaHei","Malgun Gothic",sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --r-btn:6px;
  --r-hero:20px;
  --r-card:10px;
  --r-pill:999px;
  --r-focus:4px;
  --r-small:3px;
  --r-round:50%;
  --gutter:32px;
  --content-width:1200px;
  --reading-width:800px;
  --header-height:64px;
  --anchor-offset:80px;
  --toc-offset:144px;
  --body-size:16px;
  --small-size:13px;
  --h1-size:clamp(52px,4.45vw,64px);
  --h2-size:clamp(28px,3vw,40px);
  --h3-size:22px;
  --weight-normal:400;
  --weight-medium:600;
  --weight-bold:700;
  --shadow-panel:0 18px 40px var(--ink-10);
  --shadow-accent:0 12px 30px var(--accent-10);
  --ease-out:cubic-bezier(.2,.7,.3,1);
  --duration-fast:.15s;
  --duration-reveal:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-offset);scroll-behavior:smooth}
body{margin:0;min-height:100vh;font-family:var(--font-body);font-size:var(--body-size);color:var(--text);line-height:1.7;background-color:var(--bg);background-image:linear-gradient(180deg,var(--wash-soft),var(--ink-00));-webkit-font-smoothing:antialiased}
[hidden]{display:none!important}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button,select,input,textarea{max-width:100%}
button{border:0}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
:focus-visible{outline:2px solid var(--text);outline-offset:2px;border-radius:var(--r-focus)}
h1,h2,h3,h4,p,ul,ol,figure,blockquote{margin-top:0}
h1,h2,h3{font-family:var(--font-display);font-weight:var(--weight-normal);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--h1-size);line-height:1.12;letter-spacing:-.02em;margin-bottom:24px}
h2{font-size:var(--h2-size);line-height:1.25;letter-spacing:-.02em;margin-bottom:24px}
h2::after{content:".";color:var(--accent)}
h3{font-size:var(--h3-size);line-height:1.4;margin-bottom:16px}
p{margin-bottom:20px}
ul,ol{padding-left:1.5em}
li{margin-bottom:6px}
strong{font-weight:var(--weight-medium)}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;border:1px solid var(--border);border-radius:var(--r-btn);background:var(--bg-panel-2)}
pre code{white-space:pre;overflow-wrap:normal}
hr{border:0;border-top:1px solid var(--border);margin:32px 0}
.no-break{white-space:nowrap}
.num{font-family:var(--font-mono);font-size:.92em;letter-spacing:-.01em;font-variant-numeric:tabular-nums}
.mute{color:var(--text-muted)}
.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}
.wrap{width:100%;max-width:var(--content-width);margin-inline:auto;padding-inline:var(--gutter);min-width:0}
.reading-wrap{width:100%;max-width:var(--reading-width);margin-inline:auto;padding-inline:var(--gutter);min-width:0}
.sec{padding-top:72px;padding-bottom:72px}
.section-intro{max-width:720px;margin-bottom:40px}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.grid>*{min-width:0}
.panel,.card{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(--white),var(--shadow-panel)}
.panel-recessed{background:var(--bg-panel-2);box-shadow:inset 0 1px 4px var(--ink-06)}
.prose{min-width:0;overflow-wrap:break-word}
.prose p,.prose li{line-height:1.9}
.prose h2{margin-top:56px}
.prose h3{margin-top:32px}
.prose a:not(.btn){text-decoration:underline;text-underline-offset:4px}
.prose section[id]{scroll-margin-top:var(--anchor-offset)}
.decorated-section{position:relative;isolation:isolate;overflow-x:clip}
#server-status{position:relative;display:block;min-width:0;max-width:100%;overflow:hidden;margin-top:24px;margin-bottom:32px}
#server-status>*{min-width:0;max-width:100%}
#server-status+*{margin-top:32px}
.btn{display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;white-space:nowrap;min-width:148px;min-height:46px;padding:10px 26px;border:0;border-radius:var(--r-btn);font-family:var(--font-body);font-size:16px;line-height:1.5;font-weight:var(--weight-medium);letter-spacing:.01em;text-align:center;transition:background-color var(--duration-fast),color var(--duration-fast),box-shadow var(--duration-fast)}
.btn-solid,.btn-primary{color:var(--white);background:linear-gradient(180deg,var(--accent) 0%,var(--accent-dark) 150%);box-shadow:inset 0 1px 0 var(--btn-hi),var(--shadow-accent),0 3px 8px var(--accent-18)}
.btn-solid:hover,.btn-primary:hover{background:var(--accent-dark)}
.btn-line,.btn-secondary{color:var(--accent-dark);background:var(--white);box-shadow:inset 0 0 0 1.5px var(--accent),0 10px 24px var(--ink-08)}
.btn-line:hover,.btn-secondary:hover{box-shadow:inset 0 0 0 1.5px var(--accent-dark),0 10px 24px var(--ink-10)}
.btn:active{transform:translateY(1px)}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--bg-panel-2);color:var(--text-muted);box-shadow:inset 0 0 0 1px var(--border);cursor:not-allowed}
.cta-row{margin-top:22px;display:flex;flex-wrap:wrap;gap:12px;justify-content:center}
.reveal{transition:opacity var(--duration-reveal) var(--ease-out),transform var(--duration-reveal) var(--ease-out)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
.topbar{position:relative;z-index:100;background:var(--white);box-shadow:0 1px 0 var(--border)}
.topbar-in{max-width:1328px;height:var(--header-height);margin:0 auto;padding:0 32px;display:flex;align-items:center;flex-wrap:nowrap;gap:28px}
.brand{display:flex;align-items:center;gap:10px;flex:none;min-height:32px}
.brand img{width:32px;height:32px}
.brand-word{font-weight:var(--weight-bold);font-size:18px;letter-spacing:-.01em;color:var(--text);white-space:nowrap}
.mainnav{flex:1;display:flex;justify-content:center;min-width:0}
.mainnav ul{list-style:none;margin:0;padding:0;display:flex;align-items:center}
.mainnav li{display:flex;align-items:center;margin:0}
.mainnav li+li::before{content:"·";margin:0 12px;color:var(--spine-b);font-weight:var(--weight-bold)}
.mainnav a{display:block;padding:6px 1px;font-size:14.5px;color:var(--text-muted);border-bottom:2px solid var(--ink-00);white-space:nowrap}
.mainnav a:hover{color:var(--text)}
.mainnav a[aria-current="page"]{color:var(--text);font-weight:var(--weight-medium);border-bottom-color:var(--text)}
.tools{display:flex;align-items:center;gap:14px;flex:none;margin-left:auto}
.language{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:36px;min-width:44px;width:auto;padding:6px 4px;border:0;background:var(--ink-00);font-family:inherit;font-size:14px;color:var(--text);cursor:pointer}
.lang span{white-space:nowrap}
.lang svg{display:block;width:16px;height:16px;color:var(--text-muted)}
.language-panel{position:absolute;right:0;top:calc(100% + 10px);z-index:130;min-width:176px;padding:8px;background:var(--white);border:1px solid var(--border);border-radius:var(--r-btn);box-shadow:var(--shadow-panel)}
.language-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;white-space:nowrap;border-radius:var(--r-focus);font-size:14px}
.language-panel a:hover,.language-panel a[aria-current="true"]{background:var(--bg-panel-2)}
.login{display:inline-flex;align-items:center;justify-content:center;height:36px;min-width:54px;padding:0 18px;border-radius:var(--r-btn);background:var(--white);box-shadow:inset 0 0 0 1.5px var(--text);font-size:14px;font-weight:var(--weight-medium);white-space:nowrap;color:var(--text);transition:background-color var(--duration-fast),color var(--duration-fast)}
.login:hover{background:var(--text);color:var(--white)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;background:var(--ink-00);border-radius:var(--r-btn)}
.menu-line{display:block;width:20px;height:2px;background:currentColor}
.nav-drawer{display:none}
.nav-veil{position:fixed;inset:var(--header-height) 0 0;z-index:80;background:var(--veil)}
html.nav-open{overflow:hidden}
.site-footer{padding-top:56px;padding-bottom:28px;border-top:1px solid var(--border);background:var(--bg-panel)}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:48px}
.footer-grid>*{min-width:0}
.footer-brand p{max-width:330px;color:var(--text-muted);margin:20px 0}
.footer-title{font-family:var(--font-body);font-size:14px;font-weight:var(--weight-medium);margin-bottom:16px}
.footer-links{display:flex;flex-wrap:wrap;gap:6px 20px;list-style:none;margin:0;padding:0}
.footer-links li{margin:0}
.footer-links a{display:inline-flex;align-items:center;min-height:32px;font-size:14px}
.footer-links a:hover{text-decoration:underline;text-underline-offset:4px}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:32px;padding-top:24px;border-top:1px solid var(--border)}
.footer-languages a{display:inline-flex;align-items:center;min-height:32px;font-size:14px}
.footer-languages a[aria-current="true"]{font-weight:var(--weight-medium)}
.footer-bottom{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px 24px;margin-top:24px;padding-top:20px;border-top:1px solid var(--border);font-size:13px;color:var(--text-muted)}
.footer-bottom p{margin:0}
.footer-legal{display:flex;flex-wrap:wrap;gap:8px 20px}
.footer-legal a{display:inline-flex;align-items:center;min-height:24px}
@media(min-width:1201px) and (max-width:1320px){
  .topbar-in{gap:18px;padding-inline:24px}
  .mainnav li+li::before{margin-inline:8px}
  .tools{gap:10px}
}
@media(max-width:1200px){
  .mainnav{display:none}
  .tools{margin-left:auto}
  .menu-toggle{display:inline-flex}
  .nav-drawer{position:fixed;z-index:90;top:var(--header-height);left:0;right:0;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));padding:16px var(--gutter) 32px;background:var(--bg-panel);overflow-y:auto;overscroll-behavior:contain;border-top:1px solid var(--border)}
  .nav-drawer:not([hidden]){display:block}
  .nav-drawer ul{list-style:none;padding:0;margin:0}
  .nav-drawer li{margin:0;border-bottom:1px solid var(--border)}
  .nav-drawer a{display:flex;align-items:center;width:100%;min-height:44px;padding:12px 8px}
  .nav-drawer a[aria-current]{font-weight:var(--weight-medium);background:var(--bg-panel-2)}
  .drawer-languages{margin-top:24px;border-top:1px solid var(--border)}
}
@media(max-width:768px){
  :root{--gutter:24px;--h1-size:clamp(28px,6vw,40px)}
  .grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .sec{padding-top:48px;padding-bottom:48px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .footer-brand{grid-column:1/-1}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .topbar-in{padding-inline:16px;gap:8px}
  .brand{gap:6px}
  .brand img{width:24px;height:24px}
  .brand-word{font-size:13px}
  .tools{gap:4px;margin-left:auto}
  .lang{font-size:11px;gap:2px;padding-inline:2px}
  .lang svg{width:12px;height:12px}
  .login{font-size:12px;min-width:44px;padding-inline:9px}
  .grid{grid-template-columns:minmax(0,1fr)}
  .panel,.card{padding:22px}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:28px}
  .footer-brand{grid-column:auto}
  .tilt,.decorative-tilt,.tablet,.note{transform:none}
  .decorated-section{max-width:100%;overflow-x:clip}
  .btn{min-width:128px;padding-inline:18px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal,.reveal.pending,.reveal.shown{opacity:1;transform:none;transition:none}
  .btn,.login{transition:none}
}