:root{
  color-scheme:light;
  --bg:#F6F6F7;
  --bg-top:#FBFBFC;
  --bg-bottom:#EFEEF1;
  --panel:#FFFFFF;
  --panel-2:#ECECEF;
  --panel-soft:#F2F2F4;
  --chrome-top:#FAFAFB;
  --chrome-bottom:#F3F3F5;
  --border:#DEDDE2;
  --hairline:rgba(23,22,27,.07);
  --hairline-2:rgba(23,22,27,.12);
  --accent:#A51C30;
  --accent-dark:#7A1424;
  --accent-2:#E0525A;
  --accent-a04:rgba(165,28,48,.04);
  --accent-a08:rgba(165,28,48,.08);
  --accent-a10:rgba(165,28,48,.10);
  --accent-a14:rgba(165,28,48,.14);
  --accent-a22:rgba(165,28,48,.22);
  --accent-a30:rgba(165,28,48,.30);
  --accent2-a06:rgba(224,82,90,.06);
  --accent2-a10:rgba(224,82,90,.10);
  --shade-dark:rgba(60,8,16,.32);
  --text:#17161B;
  --muted:#63616B;
  --faint:#9A98A3;
  --on-accent:#FFFFFF;
  --on-accent-a72:rgba(255,255,255,.72);
  --on-accent-a22:rgba(255,255,255,.22);
  --on-accent-a14:rgba(255,255,255,.14);
  --on-ink-hi:rgba(255,255,255,.16);
  --glass:rgba(255,255,255,.52);
  --glass-strong:rgba(255,255,255,.80);
  --glass-edge:rgba(255,255,255,.92);
  --ink-shadow:rgba(23,22,27,.07);
  --ink-shadow-2:rgba(23,22,27,.16);
  --success:#1F8A5B;
  --success-a16:rgba(31,138,91,.16);
  --warn:#B7791F;
  --error:#D0342C;
  --flag-red:#C8102E;
  --flag-navy:#1F2A6B;
  --flag-blue:#21468B;
  --flag-white:#FFFFFF;
  --clear:transparent;
  --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;
  --fs-10:10.5px;
  --fs-11:11px;
  --fs-115:11.5px;
  --fs-12:12px;
  --fs-125:12.5px;
  --fs-13:13px;
  --fs-135:13.5px;
  --fs-14:14px;
  --fs-15:15px;
  --fs-16:16px;
  --fs-17:17px;
  --fs-19:19px;
  --fs-20:20px;
  --fs-24:24px;
  --fs-h2:clamp(28px,3.2vw,40px);
  --fs-h1:clamp(52px,5vw,64px);
  --fs-h1-mobile:36px;
  --r-tiny:1px;
  --r-xs:5px;
  --r-sm:7px;
  --r-md:10px;
  --r-lg:12px;
  --r-xl:14px;
  --r-2xl:18px;
  --r-pill:999px;
  --r-round:50%;
  --gutter:24px;
  --content:1240px;
  --reading:800px;
  --header-edge:82px;
  --anchor-offset:100px;
  --toc-offset:88px;
  --toc-landing:160px;
  --ease-out:cubic-bezier(.2,.7,.25,1);
  --fast:.15s;
  --reveal-time:.35s;
  --lift-frame:0 0 0 1px var(--hairline),0 64px 120px -44px var(--accent-a14),0 30px 60px -34px var(--accent-a10),0 2px 8px var(--ink-shadow);
  --lift-float:0 0 0 1px var(--hairline),0 18px 40px -16px var(--accent-a22),0 4px 10px var(--ink-shadow);
  --lift-chip:inset 0 1px 0 var(--glass-edge),0 0 0 1px var(--hairline),0 2px 4px var(--ink-shadow);
  --lift-panel:inset 0 1px 0 var(--glass-edge),0 24px 56px -32px var(--accent-a14);
  --noise-opacity:.03;
}
*,*::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(--font-body);font-size:var(--fs-16);line-height:1.6;-webkit-font-smoothing:antialiased}
img,svg{vertical-align:middle}
img{max-width:100%;height:auto}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button:disabled{cursor:not-allowed}
a{color:inherit;text-decoration:none}
a,button,summary,input,select,textarea,[tabindex]{-webkit-tap-highlight-color:var(--accent-a10)}
:where(a,button,summary,input,select,textarea,[tabindex]):focus-visible{outline:2px solid var(--accent);outline-offset:3px}
[hidden]{display:none!important}
h1,h2,h3,h4{font-family:var(--font-display);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--fs-h1);font-weight:800;line-height:1.12;letter-spacing:-.02em;margin:0 0 24px}
h2{font-size:var(--fs-h2);line-height:1.2;letter-spacing:-.02em;margin:0 0 24px}
h3{font-size:var(--fs-24);line-height:1.35;margin:0 0 16px}
h4{font-size:var(--fs-19);margin:0 0 12px}
p{margin:0 0 20px}
ul,ol{padding-left:24px}
li+li{margin-top:8px}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere}
:not(pre)>code{padding:2px 5px;background:var(--panel-2);border-radius:var(--r-xs)}
pre{max-width:100%;overflow-x:auto;padding:24px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--panel-2)}
pre code{white-space:pre;overflow-wrap:normal}
hr{border:0;border-top:1px solid var(--border);margin:32px 0}
small{font-size:var(--fs-13)}
.wrap{width:100%;max-width:calc(var(--content) + var(--gutter)*2);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{width:100%;max-width:calc(var(--reading) + var(--gutter)*2);margin-inline:auto;padding-inline:var(--gutter)}
.sec{padding-top:80px;padding-bottom:80px}
.section-head{max-width:760px;margin-bottom:32px}
.section-head p{color:var(--muted);font-size:var(--fs-17)}
.no-break{white-space:nowrap}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono)}
.kw{background:linear-gradient(100deg,var(--accent) 10%,var(--accent-2) 95%);-webkit-background-clip:text;background-clip:text;color:var(--clear)}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.icon{width:20px;height:20px;flex-shrink:0}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.grid{display:grid;gap:24px}
.grid>*{min-width:0}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.panel,.card{min-width:0;border:1px solid var(--border);border-radius:var(--r-lg);background:var(--panel);box-shadow:var(--lift-panel)}
.card{padding:24px}
.panel-inset{background:var(--panel-2);border-radius:var(--r-md);padding:24px;min-width:0}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;min-height:42px;padding:10px 18px 10px 15px;border-radius:var(--r-md);font-size:var(--fs-15);font-weight:600;line-height:1.2;flex-shrink:0;white-space:nowrap;transition:transform var(--fast) ease,box-shadow var(--fast) ease}
.btn svg{width:17px;height:17px;flex:none}
.btn-primary{background:linear-gradient(180deg,var(--panel),var(--panel-soft));color:var(--text);border:1px solid var(--border);box-shadow:inset 0 1px 0 var(--glass-edge),0 10px 22px -12px var(--accent-a30),0 1px 2px var(--ink-shadow)}
.btn-primary svg{color:var(--accent)}
.btn-secondary{background:var(--panel-2);color:var(--text);border:1px solid var(--border);box-shadow:inset 0 1px 0 var(--glass-edge),0 1px 2px var(--ink-shadow)}
.btn-secondary svg{color:var(--muted)}
.btn:hover,.btn.is-hover{transform:translateY(-1px);box-shadow:var(--lift-float)}
.btn:active,.btn.is-pressed{transform:translateY(1px);box-shadow:inset 0 1px 3px var(--ink-shadow-2)}
.btn:disabled,.btn[aria-disabled="true"]{opacity:.55;transform:none;box-shadow:none;pointer-events:none}
.btn.is-focus{outline:2px solid var(--accent);outline-offset:3px}
.text-link{display:inline-flex;align-items:center;min-height:24px;color:var(--accent);text-underline-offset:4px}
.text-link:hover{text-decoration:underline}
.cta-row{display:flex;justify-content:center;gap:12px;flex-wrap:wrap}
#site-header{position:relative;z-index:60;padding:14px var(--gutter) 12px}
.fold #site-header{padding:0}
.nav{position:relative;z-index:65;max-width:var(--content);height:56px;margin:0 auto;display:flex;align-items:center;gap:24px;padding:0 10px 0 16px;border:1px solid var(--border);border-radius:var(--r-xl);background:var(--glass-strong);-webkit-backdrop-filter:blur(14px) saturate(140%);backdrop-filter:blur(14px) saturate(140%);box-shadow:inset 0 1px 0 var(--glass-edge),0 10px 28px -18px var(--ink-shadow-2);flex-wrap:nowrap}
.brand{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-display);font-weight:800;font-size:var(--fs-17);letter-spacing:-.02em;color:var(--text);min-height:28px;flex-shrink:0}
.brand img{width:28px;height:28px;flex:none}
.desktop-nav{flex:1;min-width:0}
.nav-links{display:flex;align-items:center;list-style:none;margin:0;padding:0;justify-content:center;gap:30px}
.nav-links li{margin:0;flex-shrink:0}
.nav-links a{display:inline-flex;align-items:center;min-height:44px;font-size:var(--fs-14);font-weight:500;color:var(--muted);transition:color var(--fast) ease;white-space:nowrap}
.nav-links a:hover{color:var(--text)}
.nav-links a[aria-current="page"]{color:var(--text);font-weight:650}
.nav-tools{display:flex;align-items:center;gap:14px;flex-shrink:0}
.lang-switch{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;height:34px;padding:0 10px;border:0;background:var(--clear);border-radius:var(--r-sm);font-size:var(--fs-135);color:var(--muted)}
.lang span{white-space:nowrap}
.lang svg{width:15px;height:15px;flex:none}
.lang-panel{position:absolute;z-index:80;right:0;top:calc(100% + 12px);width:192px;padding:6px;background:var(--panel);border:1px solid var(--border);border-radius:var(--r-md);box-shadow:var(--lift-float)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-sm);font-size:var(--fs-14)}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--panel-2);color:var(--accent)}
.login{display:inline-flex;align-items:center;justify-content:center;min-height:36px;padding:0 18px;border-radius:var(--r-pill);background:var(--text);color:var(--panel);font-size:var(--fs-135);font-weight:600;white-space:nowrap;box-shadow:inset 0 1px 0 var(--on-ink-hi),0 6px 14px -8px var(--ink-shadow-2)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;border:0;border-radius:var(--r-sm);background:var(--clear);color:var(--text)}
.menu-line{display:block;width:20px;height:2px;background:currentColor;border-radius:var(--r-tiny)}
.mobile-drawer{display:none}
.nav-veil{display:none}
html.nav-open{overflow:hidden}
.site-footer{padding-top:64px;padding-bottom:24px;background:linear-gradient(180deg,var(--bg),var(--bg-bottom));border-top:1px solid var(--border)}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:48px}
.footer-grid>*{min-width:0}
.footer-brand p{max-width:360px;margin-top:20px;color:var(--muted);font-size:var(--fs-14)}
.footer-title{font-size:var(--fs-14);font-weight:650;margin:0 0 14px}
.footer-links{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 16px}
.footer-links li{margin:0;min-width:0}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:28px;font-size:var(--fs-13);color:var(--muted)}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{color:var(--accent)}
.footer-languages{display:flex;flex-wrap:wrap;gap:12px 24px;margin-top:32px;padding-top:24px;border-top:1px solid var(--border)}
.footer-languages a[aria-current="true"]{color:var(--accent)}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px;margin-top:20px;font-size:var(--fs-12);color:var(--muted)}
.footer-bottom p{margin:0}
.footer-legal{display:flex;gap:24px;flex-wrap:wrap}
.reveal{transition:opacity var(--reveal-time) var(--ease-out),transform var(--reveal-time) var(--ease-out)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{position:relative;display:flow-root;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}
.prose{min-width:0;overflow-wrap:break-word}
.prose h2{margin-top:48px}
.prose h3{margin-top:32px}
.prose p,.prose li{line-height:1.85}
.prose a:not(.btn){color:var(--accent);text-decoration:underline;text-underline-offset:3px}
.prose img{border-radius:var(--r-md)}
@media(max-width:1200px){
  .nav{gap:16px}
  .nav-links{gap:20px}
  .nav-tools{gap:8px}
}
@media(max-width:1080px){
  .nav-links{gap:16px}
  .nav-links a{font-size:var(--fs-13)}
}
@media(max-width:1024px){
  .desktop-nav{display:none}
  .nav-tools{margin-left:auto}
  .menu-toggle{display:inline-flex}
  .mobile-drawer{display:block;position:fixed;z-index:62;top:var(--header-edge);left:0;right:0;height:calc(100dvh - var(--header-edge));max-height:calc(100dvh - var(--header-edge));overflow-y:auto;overscroll-behavior:contain;background:var(--panel);padding:16px var(--gutter) 32px;border-top:1px solid var(--border);box-shadow:var(--lift-panel)}
  .mobile-drawer a{display:flex;align-items:center;justify-content:space-between;width:100%;min-height:44px;padding:12px 16px;border-radius:var(--r-sm);font-size:var(--fs-16)}
  .mobile-drawer a:hover,.mobile-drawer a[aria-current="page"]{background:var(--panel-2);color:var(--accent)}
  .drawer-links{list-style:none;padding:0;margin:0}
  .drawer-links li{margin:0}
  .drawer-languages{border-top:1px solid var(--border);margin-top:16px;padding-top:16px}
  .drawer-languages a{font-size:var(--fs-14)}
  .drawer-languages a[aria-current="true"]{color:var(--accent);background:var(--panel-soft)}
  .nav-veil{display:block;position:fixed;z-index:61;top:var(--header-edge);right:0;bottom:0;left:0;background:var(--ink-shadow-2);border:0}
}
@media(max-width:768px){
  :root{--gutter:16px;--header-edge:72px}
  h1{font-size:var(--fs-h1-mobile);line-height:1.18}
  h3{font-size:var(--fs-20)}
  .sec{padding-top:56px;padding-bottom:56px}
  #site-header{padding:10px var(--gutter)}
  .nav{height:52px;padding:0 8px 0 12px;gap:8px}
  .nav-tools{gap:4px;margin-left:auto}
  .lang span{display:none}
  .lang{padding:0 6px}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .footer-brand{grid-column:1/-1}
  .grid-3,.grid-2{grid-template-columns:1fr}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .tilt,.refund-badge{transform:none}
  .decoration,.aura,.beam{max-width:100%}
  .footer-grid{grid-template-columns:1fr}
  .footer-brand{grid-column:auto}
  .brand{gap:7px;font-size:var(--fs-15)}
  .brand img{width:25px;height:25px}
  .login{padding:0 13px;font-size:var(--fs-13)}
  .card{padding:20px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition:none!important;animation:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}