:root{
  color-scheme:light;
  --bg:#E5EEFA;--bg-panel:#F7FAFF;--bg-panel-2:#D8E4F4;--border:#C6D4EA;
  --accent:#FF6150;--accent-dark:#D9402F;--text:#14203A;--text-muted:#56627C;
  --success:#1FA67A;--warn:#E29A12;--error:#C62839;--white:#FFFFFF;
  --lagoon-top:#EEF4FD;--lagoon-bottom:#DCE7F6;--coral-pastel:#FFD9D2;--sun-pastel:#FFE7C2;
  --mint:#34C9A5;--mint-pastel:#D3F4EA;--sky-pastel:#D5E7FF;--star:#9DB1D6;
  --pod-coral-hi:#FFF3EF;--pod-coral:#FFD2C9;--pod-coral-deep:#F2AC9D;--pod-coral-shadow:rgba(242,140,118,.38);
  --pod-sun-hi:#FFF9EC;--pod-sun:#FFE4B6;--pod-sun-deep:#F0C687;--pod-sun-shadow:rgba(226,154,18,.28);
  --pod-sky-hi:#F3F8FF;--pod-sky:#CCE0FB;--pod-sky-deep:#9EBCE8;--pod-sky-shadow:rgba(78,118,190,.30);
  --pod-iris-hi:#F5F5FF;--pod-iris:#D7D9F8;--pod-iris-deep:#ACB0E6;--pod-iris-shadow:rgba(108,114,200,.28);
  --pod-mint-hi:#F0FCF8;--pod-mint:#C2EFE1;--pod-mint-deep:#8ED7C2;--pod-mint-shadow:rgba(31,166,122,.28);
  --flag-red:#D7303B;--flag-blue:#253A7C;--flag-white:#FFFFFF;--flag-edge:rgba(20,32,58,.16);
  --glass:rgba(247,250,255,.66);--glass-strong:rgba(247,250,255,.86);
  --hi-edge:rgba(255,255,255,.92);--hi-soft:rgba(255,255,255,.55);--hi-faint:rgba(255,255,255,.24);
  --hairline:rgba(198,212,234,.78);--blob-coral:rgba(255,97,80,.08);--blob-mint:rgba(52,201,165,.07);
  --coral-10:rgba(255,97,80,.10);--coral-12:rgba(255,97,80,.12);--coral-14:rgba(255,97,80,.14);
  --coral-deep-40:rgba(217,64,47,.40);--navy-05:rgba(20,32,58,.05);--navy-08:rgba(20,32,58,.08);
  --navy-12:rgba(20,32,58,.12);--navy-18:rgba(20,32,58,.18);
  --mint-10:rgba(31,166,122,.10);--mint-16:rgba(52,201,165,.18);
  --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','Malgun Gothic','Microsoft YaHei',system-ui,sans-serif;
  --font-mono:'JetBrains Mono',ui-monospace,'SFMono-Regular',Menlo,Consolas,monospace;
  --r-xl:40px;--r-lg:24px;--r-md:16px;--r-sm:10px;--r-xs:7px;--r-pill:999px;--r-round:50%;
  --r-drawer:20px;--r-item:12px;--r-route:14px;--r-phone:30px;--r-dot:2px;--r-square:1.5px;
  --container:1320px;--reading:860px;--gutter:40px;--nav-h:72px;--toc-h:64px;
  --anchor-gap:16px;--section-space:80px;
  --size-body:16px;--size-small:14px;--size-h1:66px;--size-h2:40px;--size-h3:23px;
  --weight-body:400;--weight-medium:500;--weight-semibold:600;--weight-bold:700;--weight-heavy:800;--weight-display:900;
  --shadow-panel:inset 0 1px 0 var(--hi-edge),0 28px 64px -34px var(--coral-14),0 8px 20px -14px var(--navy-12);
  --ease: cubic-bezier(.2,.7,.2,1);--time-fast:.18s;--time-reveal:.35s;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:calc(var(--nav-h) + var(--anchor-gap));scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-body);font-size:var(--size-body);line-height:1.6;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
[hidden]{display:none!important}
img{display:block;max-width:100%;height:auto}
svg{display:block;flex-shrink:0}
a{color:inherit;text-underline-offset:4px}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
button,a,summary{-webkit-tap-highlight-color:var(--mint-16)}
button{border:0}
p{margin:0}
ul{margin:0;padding:0;list-style:none}
h1,h2,h3,h4{font-family:var(--font-display);color:var(--text);text-wrap:balance}
h1{margin:0 0 24px;font-size:clamp(52px,5vw,72px);font-weight:var(--weight-display);line-height:1.12;letter-spacing:-.02em}
h2{margin:0 0 24px;font-size:var(--size-h2);font-weight:var(--weight-display);line-height:1.2;letter-spacing:-.02em}
h3{margin:0 0 16px;font-size:var(--size-h3);font-weight:var(--weight-heavy);line-height:1.35}
h4{font-size:var(--size-body)}
:focus-visible{outline:3px solid var(--text);outline-offset:3px;border-radius:var(--r-sm)}
::selection{background:var(--coral-pastel);color:var(--text)}
.wrap{width:100%;max-width:var(--container);margin-inline:auto;padding-inline:var(--gutter)}
.reading-wrap{width:100%;max-width:var(--reading);margin-inline:auto;padding-inline:var(--gutter)}
.sec{padding-top:var(--section-space);padding-bottom:var(--section-space)}
.grid{display:grid;gap:24px}
.grid>*{min-width:0}
.grid--three{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--five{grid-template-columns:repeat(5,minmax(0,1fr))}
.stack{display:grid;gap:24px;min-width:0}
.panel,.card{min-width:0;padding:32px;border:1px solid var(--hi-edge);border-radius:var(--r-lg);background:var(--bg-panel);box-shadow:var(--shadow-panel)}
.panel--sun{background:linear-gradient(135deg,var(--coral-pastel),var(--sun-pastel))}
.muted{color:var(--text-muted)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.no-break{white-space:nowrap}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.skip{position:absolute;left:16px;top:-64px;z-index:100;padding:10px 18px;border-radius:var(--r-pill);background:var(--text);color:var(--white);font-weight:var(--weight-bold);text-decoration:none}
.skip:focus{top:12px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.prose{min-width:0;overflow-wrap:break-word}
.prose p,.prose ul,.prose ol,.prose pre,.prose blockquote{margin-block:0 24px}
.prose ul{list-style:disc;padding-left:24px}
.prose ol{padding-left:26px}
.prose li+li{margin-top:10px}
.prose h2{margin-top:48px}
.prose h3{margin-top:32px}
code{font-family:var(--font-mono);font-size:.9em;overflow-wrap:anywhere}
pre{max-width:100%;overflow-x:auto;padding:24px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--bg-panel-2)}
pre code{overflow-wrap:normal;white-space:pre}
.btn{display:inline-flex;align-items:center;justify-content:center;flex-shrink:0;gap:10px;height:56px;padding:0 30px;border:0;border-radius:var(--r-pill);font-family:var(--font-body);font-size:16.5px;font-weight:var(--weight-heavy);text-decoration:none;letter-spacing:-.005em;white-space:nowrap;transition:transform var(--time-fast) ease,box-shadow var(--time-fast) ease}
.btn svg{width:18px;height:18px}
.btn--primary,.btn-primary{background:linear-gradient(135deg,var(--accent),var(--accent-dark));color:var(--white);box-shadow:inset 0 1px 0 var(--hi-faint),0 18px 34px -16px var(--coral-deep-40)}
.btn--ghost,.btn-secondary{background:var(--white);color:var(--text);box-shadow:inset 0 0 0 1.5px var(--border),0 12px 24px -16px var(--navy-18)}
.btn--small{height:44px;padding-inline:20px;font-size:var(--size-small)}
.btn:hover{transform:translateY(-2px)}
.btn:active{transform:translateY(0)}
.btn:disabled,.btn[aria-disabled="true"]{cursor:not-allowed;opacity:.6;transform:none;box-shadow:none}
#site-header{position:sticky;top:0;z-index:50}
.topbar{position:sticky;top:0;z-index:50;background:var(--glass);-webkit-backdrop-filter:blur(16px) saturate(140%);backdrop-filter:blur(16px) saturate(140%);border-bottom:1px solid var(--hi-edge);box-shadow:0 1px 0 var(--hairline)}
.topbar__in{max-width:var(--container);margin:0 auto;padding:0 var(--gutter);height:var(--nav-h);display:flex;align-items:center;gap:32px;flex-wrap:nowrap}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text);flex-shrink:0}
.brand__mark{width:34px;height:34px;filter:drop-shadow(0 6px 10px var(--coral-14))}
.brand__en{font-family:var(--font-display);font-weight:var(--weight-display);font-size:21px;letter-spacing:-.03em;line-height:1}
.brand__zh{font-size:var(--size-small);font-weight:var(--weight-medium);color:var(--text-muted);line-height:1}
.nav{flex:1;display:flex;justify-content:center;min-width:0}
.nav__list{display:flex;align-items:center;list-style:none;margin:0;padding:0}
.nav__list li{display:flex;align-items:center}
.nav__list li+li::before{content:"·";margin:0 11px;color:var(--star);font-weight:var(--weight-display)}
.nav__list a{position:relative;display:inline-flex;align-items:center;min-height:32px;padding:6px 1px;font-size:14.5px;font-weight:var(--weight-semibold);color:var(--text-muted);text-decoration:none;white-space:nowrap;transition:color var(--time-fast) ease}
.nav__list a:hover{color:var(--text)}
.nav__list a[aria-current="page"]{color:var(--text);font-weight:var(--weight-heavy)}
.nav__list a[aria-current="page"]::after{content:"";position:absolute;left:0;right:0;bottom:0;height:5px;border-radius:var(--r-pill);background:linear-gradient(90deg,var(--coral-pastel),var(--sun-pastel));z-index:-1}
.tools{display:flex;align-items:center;gap:12px;flex-shrink:0}
.lang-wrap{position:relative}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;height:40px;padding:0 15px;border:1px solid var(--border);border-radius:var(--r-pill);background:var(--hi-soft);color:var(--text);font:var(--weight-semibold) 13.5px/1 var(--font-body);cursor:pointer;white-space:nowrap}
.lang__name{white-space:nowrap}
.lang__arrow{font-size:11px;color:var(--text-muted)}
.lang-panel{position:absolute;right:0;top:calc(100% + 12px);z-index:80;width:188px;padding:8px;border:1px solid var(--border);border-radius:var(--r-md);background:var(--bg-panel);box-shadow:var(--shadow-panel)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:10px 14px;border-radius:var(--r-sm);font-size:var(--size-small);text-decoration:none}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{background:var(--bg-panel-2)}
.login{display:inline-flex;align-items:center;justify-content:center;height:42px;padding:0 24px;border-radius:var(--r-pill);background:var(--text);color:var(--white);font-weight:var(--weight-heavy);font-size:14.5px;text-decoration:none;white-space:nowrap;box-shadow:inset 0 1px 0 var(--hi-faint),0 10px 20px -10px var(--navy-18);transition:transform var(--time-fast) ease}
.login:hover{transform:translateY(-1px)}
.menu-button{display:none;align-items:center;justify-content:center;flex-direction:column;gap:5px;min-width:44px;min-height:44px;padding:10px;border:1px solid var(--border);border-radius:var(--r-pill);background:var(--bg-panel);color:var(--text)}
.menu-button__line{display:block;width:20px;height:2px;background:currentColor;border-radius:var(--r-dot)}
.mobile-nav{position:fixed;z-index:49;top:var(--nav-h);left:0;right:0;height:calc(100dvh - var(--nav-h));max-height:calc(100dvh - var(--nav-h));padding:20px var(--gutter) 32px;overflow-y:auto;overscroll-behavior:contain;background:var(--bg-panel);border-top:1px solid var(--border)}
.mobile-nav a{display:flex;align-items:center;width:100%;min-height:48px;padding:12px 16px;border-radius:var(--r-item);text-decoration:none;font-weight:var(--weight-semibold)}
.mobile-nav a:hover,.mobile-nav a[aria-current]{background:var(--bg-panel-2)}
.mobile-nav__languages{padding-top:16px;margin-top:16px;border-top:1px solid var(--border)}
html.nav-open{overflow:hidden}
.site-footer{padding-top:56px;padding-bottom:28px;background:var(--bg-panel-2);border-top:1px solid var(--hi-edge)}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:40px}
.footer-grid>*{min-width:0}
.footer-brand{display:grid;align-content:start;gap:20px}
.footer-title{margin:0 0 16px;font-size:var(--size-body);font-weight:var(--weight-heavy)}
.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:var(--size-small);text-decoration:none}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{text-decoration:underline}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 24px;padding-block:28px}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px;padding-top:20px;border-top:1px solid var(--border);font-size:var(--size-small);color:var(--text-muted)}
.footer-legal{display:flex;flex-wrap:wrap;gap:8px 20px}
.reveal{transition:opacity var(--time-reveal) var(--ease),transform var(--time-reveal) var(--ease)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{display:block;position:relative;min-width:0;width:100%;max-width:100%;min-height:80px;overflow:hidden;margin-block:24px}
#server-status>*{min-width:0;max-width:100%}
#server-status+*{margin-top:24px}
@media(max-width:1270px){
  .topbar__in{gap:20px}
  .nav__list li+li::before{margin-inline:7px}
  .nav__list a{font-size:13px}
  .tools{gap:8px}
  .lang{padding-inline:12px}
}
@media(max-width:1120px){
  .nav{display:none}
  .tools{margin-left:auto}
  .menu-button{display:inline-flex}
}
@media(min-width:1121px){.mobile-nav{display:none}}
@media(max-width:768px){
  :root{--gutter:24px;--section-space:48px;--size-h2:30px;--size-h3:21px}
  h1{font-size:clamp(28px,7vw,40px)}
  .grid--three{grid-template-columns:1fr}
  .grid--five{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .footer-brand{grid-column:1/-1}
  .panel,.card{padding:24px}
}
@media(max-width:640px){
  :root{--gutter:16px;--nav-h:64px}
  .no-break{white-space:normal}
  .topbar__in{gap:10px}
  .brand{gap:6px}
  .brand__mark{width:28px;height:28px}
  .brand__en{font-size:18px}
  .tools{margin-left:auto;gap:6px}
  .lang{height:38px;padding-inline:8px;font-size:11px;gap:4px}
  .login{height:38px;padding-inline:12px;font-size:13px}
  .menu-button{padding:10px;min-width:44px}
  .tilt,.laptop,.sticker,.pod{transform:none}
  .hero,.feature-stage,.atmosphere{max-width:100%;overflow-x:clip}
  .footer-grid{grid-template-columns:1fr}
  .footer-brand{grid-column:auto}
  .btn{font-size:var(--size-body);padding-inline:24px}
  .footer-bottom{align-items:flex-start;flex-direction:column}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{transition-duration:0s!important;animation:none!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}