:root{
  color-scheme:light;
  --bg:#F6F7F9;
  --panel:#FFFFFF;
  --panel-2:#EEF1F5;
  --line:#DFE3EA;
  --accent:#E21AB8;
  --accent-dark:#A80F87;
  --ink:#12151C;
  --muted:#5A6272;
  --ok:#17A35A;
  --warn:#D98A0B;
  --err:#D6303F;
  --ok-tint:rgba(23,163,90,.10);
  --ink-soft:rgba(18,21,28,.06);
  --ink-shadow:rgba(18,21,28,.42);
  --sky-top:#C2DEFC;
  --sky-1:#CFE6FD;
  --sky-tint:#E7F2FE;
  --sky-2:#94C6F7;
  --sky-3:#4C98E8;
  --sky-shadow:rgba(62,140,226,.12);
  --sky-shadow-2:rgba(62,140,226,.14);
  --win-shadow:rgba(30,78,140,.26);
  --sky-glow:rgba(120,180,245,.55);
  --sky-glow-0:rgba(120,180,245,0);
  --white:#FFFFFF;
  --glass:rgba(255,255,255,.56);
  --glass-line:rgba(255,255,255,.88);
  --gloss:rgba(255,255,255,.20);
  --gloss-0:rgba(255,255,255,0);
  --cloud:rgba(255,255,255,.92);
  --cloud-soft:rgba(255,255,255,.55);
  --cloud-0:rgba(255,255,255,0);
  --silver-1:#EEF1F5;
  --silver-2:#C9CFD8;
  --silver-3:#AEB6C2;
  --graphite:#1B1F27;
  --graphite-2:#2B313C;
  --graphite-edge:rgba(255,255,255,.07);
  --flag-red:#D8283A;
  --flag-blue:#25356F;
  --flag-white:#FFFFFF;
  --flag-edge:rgba(18,21,28,.14);
  --pink-tint:#FCE6F6;
  --mint-tint:#E2F4EA;
  --navy:#14213D;
  --veil:rgba(18,21,28,.28);
  --clear:transparent;
  --font-display:'Inter','Noto Sans SC','PingFang SC','Hiragino Sans','Microsoft YaHei','Apple SD Gothic Neo','Malgun Gothic',system-ui,sans-serif;
  --font-body:'Inter','Noto Sans SC','PingFang SC','Hiragino Sans','Microsoft YaHei','Apple SD Gothic Neo','Malgun Gothic',system-ui,sans-serif;
  --font-mono:'JetBrains Mono','SFMono-Regular',Menlo,Consolas,'Liberation Mono',monospace;
  --text-xs:12px;
  --text-sm:14px;
  --text-base:16px;
  --text-lede:18px;
  --text-h3:24px;
  --text-h2:clamp(28px,3.4vw,44px);
  --text-h1:clamp(52px,5vw,68px);
  --r-pill:999px;
  --r-xl:28px;
  --r-lg:22px;
  --r-md:16px;
  --r-sm:10px;
  --r-dot:50%;
  --r-none:0;
  --r-lid:30px;
  --r-bezel:24px;
  --r-screen:12px;
  --r-notch:0 0 10px 10px;
  --r-deck:4px 4px 22px 22px / 4px 4px 14px 14px;
  --r-grip:0 0 9px 9px;
  --hi-edge:inset 0 1px 0 var(--glass-line),inset 0 0 0 1px var(--glass-line);
  --shadow-float:0 28px 64px -20px var(--sky-shadow-2),0 10px 26px -12px var(--sky-shadow);
  --shadow-lift:0 44px 96px -28px var(--sky-shadow),0 14px 32px -14px var(--sky-shadow-2);
  --gutter:24px;
  --content:1200px;
  --header-height:68px;
  --anchor-space:84px;
  --toc-space:152px;
  --ease:ease;
  --fast:.2s;
  --reveal-time:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:var(--anchor-space)}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font-body);font-size:var(--text-base);line-height:1.65;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
button:disabled,[aria-disabled="true"]{opacity:.45;cursor:not-allowed}
a,button,summary,input,select,textarea{touch-action:manipulation}
:where(a,button,summary,input,select,textarea,[tabindex]):focus-visible{outline:2px solid var(--accent-dark);outline-offset:3px}
[hidden]{display:none!important}
img{max-width:100%;height:auto;display:block}
svg{flex-shrink:0;vertical-align:middle}
h1,h2,h3{font-family:var(--font-display);text-wrap:balance;overflow-wrap:break-word}
h1{font-size:var(--text-h1);line-height:1.12;font-weight:900;letter-spacing:-.02em;margin:0 0 24px}
h2{font-size:var(--text-h2);line-height:1.2;font-weight:900;letter-spacing:-.02em;margin:0 0 20px}
h3{font-size:var(--text-h3);line-height:1.35;font-weight:800;margin:0 0 12px}
p{margin:0 0 20px}
ul,ol{padding-left:24px}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:20px;background:var(--panel-2);border-radius:var(--r-md)}
pre code{overflow-wrap:normal;white-space:pre}
table{border-collapse:collapse}
:where(main,section,article,aside,div,li){min-width:0}
.wrap{width:100%;max-width:var(--content);margin-inline:auto;padding-inline:var(--gutter)}
.sec{padding-top:80px;padding-bottom:80px}
.stack{display:grid;gap:24px}
.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.grid>*{min-width:0}
.center{text-align:center}
.muted{color:var(--muted)}
.mono{font-family:var(--font-mono)}
.no-break{white-space:nowrap}
.section-head{max-width:760px;margin:0 auto 32px;text-align:center}
.section-head p{color:var(--muted);font-size:var(--text-lede)}
.panel,.card{background:var(--panel);border-radius:var(--r-xl);padding:28px;box-shadow:var(--hi-edge),var(--shadow-float)}
.decor-zone{position:relative;overflow-x:clip;max-width:100%}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.ico-s{fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:52px;padding:12px 30px;border-radius:var(--r-pill);font-size:16.5px;font-weight:700;line-height:1.25;text-align:center;flex-shrink:0;white-space:nowrap;transition:transform var(--fast),background-color var(--fast),box-shadow var(--fast)}
.btn:hover{transform:translateY(-1px)}
.btn svg{width:16px;height:16px}
.btn-solid,.btn-primary{background:var(--ink);color:var(--white);box-shadow:0 14px 30px -14px var(--ink-shadow)}
.btn-solid:active,.btn-primary:active{background:var(--graphite-2);transform:translateY(0)}
.btn-line,.btn-secondary{background:var(--panel);color:var(--ink);box-shadow:inset 0 0 0 1.5px var(--ink)}
.btn-line:hover,.btn-secondary:hover{background:var(--panel-2)}
.btn-small{min-height:36px;padding:8px 16px;font-size:var(--text-sm)}
.cta{display:flex;justify-content:center;flex-wrap:wrap;gap:12px;margin-top:22px}
.badge,.tag{display:inline-flex;align-items:center;gap:6px;min-height:28px;max-width:100%;padding:4px 12px;border-radius:var(--r-pill);background:var(--panel-2);font-size:var(--text-xs);font-weight:650;overflow-wrap:anywhere}
.badge-ok{background:var(--ok-tint);color:var(--ink)}
.badge-accent{background:var(--accent);color:var(--white)}
.live{position:relative;display:inline-block;width:7px;height:7px;border-radius:var(--r-dot);background:var(--ok);flex:none}
#site-header{position:relative;z-index:110;min-height:var(--header-height)}
.top{position:relative;z-index:53;display:flex;align-items:center;flex-wrap:nowrap;gap:24px;max-width:1312px;height:var(--header-height);margin:0 auto;padding:0 32px}
.brand{display:inline-flex;align-items:center;gap:10px;flex:none;min-height:40px}
.brand img{width:30px;height:30px;flex:none}
.brand-en{font-family:var(--font-display);font-weight:800;font-size:20px;letter-spacing:-.02em;line-height:1}
.brand-zh{font-size:13.5px;font-weight:500;color:var(--muted);line-height:1;padding-left:10px;border-left:1px solid var(--silver-2)}
.nav{flex:1;display:flex;justify-content:center;min-width:0}
.nav ul{display:flex;align-items:center;gap:2px;list-style:none;margin:0;padding:0;border-radius:var(--r-pill);background:var(--glass);box-shadow:var(--hi-edge);backdrop-filter:blur(12px)}
.nav li{padding-block:4px}
.nav li:first-child{padding-left:4px}
.nav li:last-child{padding-right:4px}
.nav a{display:flex;align-items:center;justify-content:center;padding:8px 14px;border-radius:var(--r-pill);font-size:14.5px;font-weight:500;line-height:20px;color:var(--muted);white-space:nowrap;transition:color var(--fast),background-color var(--fast)}
.nav a:hover{color:var(--ink)}
.nav a.is-on{background:var(--panel);color:var(--ink);font-weight:650;box-shadow:0 6px 16px -8px var(--sky-shadow-2),inset 0 0 0 1px var(--ink-soft)}
.tools{display:flex;align-items:center;gap:8px;flex-shrink:0}
.lang-box{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:40px;width:auto;padding:0 12px;border-radius:var(--r-pill);font-size:var(--text-sm);font-weight:500;white-space:nowrap}
.lang span{white-space:nowrap}
.lang svg{width:16px;height:16px;color:var(--muted)}
.lang:hover{background:var(--glass)}
.lang-panel{position:absolute;right:0;top:calc(100% + 8px);z-index:60;min-width:180px;padding:8px;background:var(--panel);border-radius:var(--r-md);box-shadow:var(--shadow-float),inset 0 0 0 1px var(--line)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-sm)}
.lang-panel a:hover,.lang-panel a[aria-current]{background:var(--panel-2)}
.btn-login{display:inline-flex;align-items:center;justify-content:center;height:40px;padding:0 22px;border-radius:var(--r-pill);background:var(--ink);color:var(--white);font-size:14.5px;font-weight:650;white-space:nowrap;box-shadow:0 10px 22px -12px var(--ink-shadow)}
.menu-toggle{display:none;align-items:center;justify-content:center;flex-direction:column;gap:4px;min-width:44px;min-height:44px;border-radius:var(--r-pill);background:var(--glass)}
.menu-line{display:block;width:20px;height:2px;background:currentColor;border-radius:var(--r-pill)}
.drawer{position:fixed;z-index:52;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;padding:16px var(--gutter) 32px;background:var(--panel)}
.drawer a{display:flex;align-items:center;width:100%;min-height:48px;padding:12px 16px;border-radius:var(--r-sm)}
.drawer a:hover,.drawer a.is-on{background:var(--panel-2)}
.drawer-languages{display:grid;border-top:1px solid var(--line);margin-top:12px;padding-top:12px}
.nav-veil{position:fixed;z-index:51;inset:var(--header-height) 0 0;background:var(--veil)}
html.nav-open{overflow:hidden}
.footer{background:var(--panel-2);border-top:1px solid var(--glass-line);padding-top:56px;padding-bottom:28px}
.footer-grid{display:grid;grid-template-columns:1.3fr 1fr 1fr;gap:48px}
.footer-brand p{max-width:320px;margin-top:16px;color:var(--muted);font-size:var(--text-sm)}
.footer-title{font-size:var(--text-base);font-weight:750;margin-bottom:12px}
.footer-links{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 16px}
.footer a:not(.brand){display:inline-flex;align-items:center;min-height:32px;font-size:var(--text-sm);overflow-wrap:anywhere}
.footer a:hover{color:var(--accent-dark)}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 20px;margin-top:32px;padding-top:20px;border-top:1px solid var(--line)}
.footer-bottom{display:flex;align-items:center;flex-wrap:wrap;justify-content:space-between;gap:16px;margin-top:20px;font-size:var(--text-xs);color:var(--muted)}
.footer-legal{display:flex;gap:20px}
.reveal{transition:opacity var(--reveal-time) var(--ease),transform var(--reveal-time) var(--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-block:24px}
#server-status+*{margin-top:24px}
#server-status :where(.grid,[class*="grid"]){min-width:0;max-width:100%}
.prose{max-width:820px;margin-inline:auto;overflow-wrap:break-word}
.prose :where(h2,h3){margin-top:40px}
.prose a{color:var(--accent-dark);text-decoration:underline;text-underline-offset:3px}
.prose li{margin-bottom:8px}
section[id]{scroll-margin-top:var(--anchor-space)}
body:has(.toc-tabs) section[id]{scroll-margin-top:var(--toc-space)}
@media(min-width:921px){.drawer,.nav-veil{display:none!important}}
@media(max-width:1259px){.floats{display:none}}
@media(max-width:1140px){
  .brand-zh{display:none}
  .top{gap:16px;padding-inline:24px}
  .nav a{padding:8px 10px;font-size:var(--text-sm)}
}
@media(max-width:920px){
  .nav{display:none}
  .top{gap:12px;padding-inline:var(--gutter)}
  .tools{margin-left:auto}
  .menu-toggle{display:inline-flex}
  .grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media(max-width:768px){
  h1{font-size:38px}
  h2{font-size:30px}
  .sec{padding-top:48px;padding-bottom:48px}
  .btn{min-height:48px;padding:12px 24px;font-size:var(--text-base)}
  .footer-grid{grid-template-columns:1fr;gap:28px}
}
@media(max-width:640px){
  :root{--gutter:16px}
  .no-break{white-space:normal}
  .tilt,.fcard-refund,.fcard-pay,.sticker{transform:none}
  .decor-zone{max-width:100%;overflow-x:clip}
  .top{gap:8px}
  .brand{gap:6px}
  .brand img{width:25px;height:25px}
  .brand-en{font-size:17px}
  .tools{gap:4px;margin-left:auto}
  .lang{padding-inline:7px;font-size:11px;gap:4px}
  .lang svg{width:13px;height:13px}
  .btn-login{padding-inline:13px;font-size:13px}
  .grid{grid-template-columns:1fr}
  .panel,.card{padding:24px}
  .footer-bottom{align-items:flex-start;flex-direction:column}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}