:root{
  color-scheme:light;
  --bg:#E4ECF6;
  --bg-top:#EEF3FA;
  --bg-bottom:#DEE7F3;
  --panel:#F7FAFE;
  --panel-2:#D8E3F0;
  --panel-fog:#EAF0F9;
  --feature-bg:#EEF2F8;
  --border:#C9D6E8;
  --border-soft:rgba(201,214,232,.72);
  --groove:rgba(216,227,240,.62);
  --white:#FFFFFF;
  --white-a30:rgba(255,255,255,.30);
  --white-a40:rgba(255,255,255,.40);
  --white-a60:rgba(255,255,255,.60);
  --white-a70:rgba(255,255,255,.70);
  --white-a80:rgba(255,255,255,.80);
  --white-a90:rgba(255,255,255,.90);
  --clear:transparent;
  --accent:#D23C77;
  --accent-dark:#A82259;
  --accent-soft:#FBEAF1;
  --accent-glow:#F28DB5;
  --violet:#7C5CE6;
  --violet-soft:#EFEBFD;
  --violet-ink:#6E67C2;
  --cobalt:#3D6EE0;
  --text:#14203A;
  --text-muted:#4E5D78;
  --text-faint:#7A88A1;
  --mark:#8794AA;
  --success:#1E9E6A;
  --warn:#C98A12;
  --error:#C9372C;
  --accent-a10:rgba(210,60,119,.10);
  --accent-a12:rgba(210,60,119,.12);
  --accent-a16:rgba(210,60,119,.16);
  --accent-a30:rgba(210,60,119,.30);
  --accent-a40:rgba(210,60,119,.40);
  --violet-a10:rgba(124,92,230,.10);
  --violet-a12:rgba(124,92,230,.12);
  --violet-a20:rgba(124,92,230,.20);
  --violet-a24:rgba(124,92,230,.24);
  --cobalt-a08:rgba(61,110,224,.08);
  --cobalt-a10:rgba(61,110,224,.10);
  --cobalt-a40:rgba(61,110,224,.40);
  --success-a20:rgba(30,158,106,.20);
  --ink-a06:rgba(20,32,58,.06);
  --ink-a08:rgba(20,32,58,.08);
  --ink-a10:rgba(20,32,58,.10);
  --veil-bg:rgba(20,32,58,.24);
  --flag-red:#D4343F;
  --flag-blue:#2A4C9C;
  --flag-navy:#27386E;
  --flag-green:#2C8A56;
  --flag-white:#FFFFFF;
  --tyo-1:#9A8BE4;
  --tyo-2:#E6A6C8;
  --tyo-3:#FAD4C3;
  --tyo-sun:#FFEBDD;
  --tyo-mtn:#8C7BCF;
  --tyo-hill:#6E5EB8;
  --tyo-city:#463A88;
  --snow:#F6F3FF;
  --hkg-1:#D6E5FB;
  --hkg-2:#9CBBF0;
  --hkg-3:#6E95E1;
  --hkg-hill:#B1C8F2;
  --hkg-b2:#5B80D2;
  --hkg-b1:#3A5DB4;
  --hkg-water:#2D52A2;
  --hkg-glint:#BFD3F7;
  --lax-1:#5A80E2;
  --lax-2:#B68BD6;
  --lax-3:#F6AA76;
  --lax-sun:#FFDDB0;
  --lax-hill:#7A58A6;
  --lax-city:#5F4790;
  --lax-palm:#35295E;
  --lax-ground:#43337A;
  --sin-1:#D3F3EA;
  --sin-2:#8AD5C5;
  --sin-3:#40AE9C;
  --sin-far:#78C4B4;
  --sin-dome:#F1FCF9;
  --sin-rib:rgba(31,111,102,.35);
  --sin-tree:#1F6F66;
  --sin-ground:#258A7B;
  --light:#FFE6B8;
  --r-xl:32px;
  --r-lg:28px;
  --r-win:18px;
  --r-md:20px;
  --r-sm:12px;
  --r-logo:10px;
  --r-tiny:4px;
  --r-flag-sm:3px;
  --r-hub:22px;
  --r-pill:999px;
  --r-round:50%;
  --font-display:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Apple SD Gothic Neo","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Apple SD Gothic Neo","Malgun Gothic","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,"SFMono-Regular",Menlo,Consolas,monospace;
  --fs-body:16px;
  --fs-small:14px;
  --fs-caption:12px;
  --fs-h1:64px;
  --fs-h2:40px;
  --fs-h3:24px;
  --weight-normal:400;
  --weight-medium:500;
  --weight-strong:600;
  --leading-body:1.6;
  --leading-title:1.12;
  --gutter:32px;
  --shell-width:1264px;
  --header-height:76px;
  --anchor-space:92px;
  --toc-space:152px;
  --space-section:80px;
  --ease-out:cubic-bezier(.2,.7,.2,1);
  --time-fast:.2s;
  --time-reveal:.35s;
  --shadow-panel:0 40px 90px -28px var(--accent-a16),0 16px 40px -24px var(--violet-a20);
  --shadow-win:0 16px 40px -14px var(--accent-a10),0 2px 6px var(--ink-a06);
  --shadow-float:0 14px 32px -12px var(--accent-a16),0 2px 6px var(--ink-a06);
  --shadow-card:0 24px 60px -24px var(--accent-a10),inset 0 1px 0 var(--white);
  --shadow-button:0 14px 30px -12px var(--accent-a40),inset 0 1px 0 var(--white-a30);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-padding-top:var(--anchor-space);scroll-behavior:smooth}
body{margin:0;font-family:var(--font-body);font-size:var(--fs-body);line-height:var(--leading-body);font-weight:var(--weight-normal);color:var(--text);background:var(--bg);-webkit-font-smoothing:antialiased}
a{color:inherit;text-underline-offset:.2em}
button,input,select,textarea{font:inherit}
button{cursor:pointer}
button,input,select,textarea{color:var(--text)}
button{border:0}
img{display:block;max-width:100%;height:auto}
svg{flex-shrink:0}
figure{margin:0}
ul,ol{padding-inline-start:1.5em}
h1,h2,h3,h4,p{overflow-wrap:break-word}
h1,h2,h3{font-family:var(--font-display);font-weight:var(--weight-normal);text-wrap:balance}
h1{font-size:clamp(52px,4.45vw,72px);line-height:var(--leading-title);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-h3);line-height:1.35;margin:0 0 16px}
p{margin:0 0 20px}
strong{font-weight:var(--weight-strong)}
small{font-size:var(--fs-small)}
code,kbd,pre{font-family:var(--font-mono)}
code{overflow-wrap:anywhere;background:var(--panel-2);border-radius:var(--r-tiny);padding:2px 5px}
pre{max-width:100%;overflow-x:auto;padding:24px;background:var(--text);color:var(--panel);border-radius:var(--r-md);line-height:1.7}
pre code{overflow-wrap:normal;white-space:pre;background:var(--clear);padding:0;color:inherit}
hr{border:0;border-top:1px solid var(--border);margin:32px 0}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
[hidden]{display:none!important}
.no-break{white-space:nowrap}
.sr-only{position:absolute;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.shell,.wrap{width:100%;max-width:var(--shell-width);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-top:var(--space-section);padding-bottom:var(--space-section)}
.reading{max-width:860px}
.muted{color:var(--text-muted)}
.hl{color:var(--accent)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.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))}
.panel,.card{min-width:0;padding:32px;background:var(--panel);border-radius:var(--r-lg);box-shadow:var(--shadow-card);border:1px solid var(--white-a80)}
.card{transition:transform var(--time-fast) var(--ease-out)}
.card:hover{transform:translateY(-3px)}
.ambient{position:relative;isolation:isolate;overflow-x:clip;max-width:100%}
.ambient::before{content:"";position:absolute;inset:0 0 20% 35%;z-index:-1;pointer-events:none;background:radial-gradient(ellipse at 85% 25%,var(--accent-a10),var(--clear) 65%),radial-gradient(ellipse at 60% 70%,var(--violet-a10),var(--clear) 70%)}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:52px;padding:0 28px;border:0;border-radius:var(--r-pill);font-size:var(--fs-body);font-weight:var(--weight-medium);text-decoration:none;white-space:nowrap;flex-shrink:0;transition:background-color var(--time-fast),transform var(--time-fast),box-shadow var(--time-fast)}
.btn svg{width:18px;height:18px}
.btn-solid,.btn-primary{background:var(--accent);color:var(--white);box-shadow:var(--shadow-button)}
.btn-solid:hover,.btn-primary:hover{background:var(--accent-dark);transform:translateY(-1px)}
.btn-line,.btn-secondary{background:var(--white);color:var(--accent);box-shadow:inset 0 0 0 1.5px var(--accent)}
.btn-line:hover,.btn-secondary:hover{background:var(--accent-soft)}
.btn-sm{min-height:44px;padding:0 22px;font-size:15px}
.btn:active{transform:translateY(1px)}
.btn:disabled,.btn[aria-disabled="true"]{background:var(--panel-2);color:var(--text-muted);box-shadow:none;cursor:not-allowed;transform:none}
.btn-demo-hover{background:var(--accent-dark);color:var(--white)}
.btn-demo-focus{outline:2px solid var(--accent);outline-offset:3px}
.cta-pair{display:flex;flex-wrap:wrap;gap:14px;margin-top:32px}
.masthead{position:relative;z-index:40}
#site-header{position:relative;z-index:40;min-height:var(--header-height)}
.masthead-row{height:var(--header-height);display:flex;align-items:center;gap:28px;flex-wrap:nowrap;position:relative;z-index:43}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text);flex:none;min-height:44px}
.brand-logo{width:34px;height:34px;border-radius:var(--r-logo);flex-shrink:0}
.brand-en{font-family:var(--font-display);font-size:19px;font-weight:var(--weight-strong);letter-spacing:-.01em;white-space:nowrap}
.brand-zh{font-size:var(--fs-small);font-weight:var(--weight-normal);color:var(--text-muted);padding-left:10px;border-left:1px solid var(--border);white-space:nowrap}
.mainnav{flex:1;min-width:0}
.mainnav ul{display:flex;align-items:center;justify-content:center;list-style:none;margin:0;padding:0;gap:2px}
.mainnav li{min-width:0}
.mainnav a{display:flex;align-items:center;gap:6px;padding:8px 11px;border-radius:var(--r-pill);font-size:14.5px;color:var(--text-muted);text-decoration:none;white-space:nowrap;min-height:40px;transition:color var(--time-fast),background-color var(--time-fast)}
.mainnav a svg{width:16px;height:16px;flex:none}
.mainnav a:hover{color:var(--text);background:var(--white-a60)}
.mainnav a[aria-current="page"],.mobile-drawer a[aria-current="page"]{color:var(--text);background:var(--white-a80);box-shadow:inset 0 0 0 1px var(--white),0 6px 14px -8px var(--accent-a16)}
.masthead-tools{display:flex;align-items:center;gap:8px;flex-shrink:0}
.lang-switch{position:relative;flex-shrink:0}
.lang{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-width:44px;width:auto;height:40px;padding:0 12px;border:0;border-radius:var(--r-pill);background:var(--clear);color:var(--text-muted);font-size:var(--fs-small);cursor:pointer;white-space:nowrap}
.lang span{white-space:nowrap}
.lang svg{width:16px;height:16px}
.lang:hover{background:var(--white-a60);color:var(--text)}
.lang-panel{position:absolute;top:calc(100% + 10px);right:0;z-index:60;min-width:180px;padding:8px;border-radius:var(--r-md);background:var(--panel);border:1px solid var(--white);box-shadow:var(--shadow-float)}
.lang-panel a{display:flex;align-items:center;min-height:44px;padding:8px 12px;border-radius:var(--r-sm);text-decoration:none;color:var(--text-muted);white-space:nowrap}
.lang-panel a:hover,.lang-panel a[aria-current="true"]{color:var(--accent-dark);background:var(--accent-soft)}
.login{display:inline-flex;align-items:center;justify-content:center;gap:7px;height:40px;padding:0 18px;border-radius:var(--r-pill);background:var(--text);color:var(--white);font-size:var(--fs-small);font-weight:var(--weight-medium);text-decoration:none;white-space:nowrap;box-shadow:0 8px 18px -10px var(--ink-a10),inset 0 1px 0 var(--white-a30);transition:background-color var(--time-fast)}
.login svg{width:16px;height:16px}
.login:hover{background:var(--text-muted)}
.menu-toggle{display:none;align-items:center;justify-content:center;min-width:44px;min-height:44px;background:var(--white-a80);color:var(--text);border-radius:var(--r-sm);padding:10px}
.menu-toggle svg{display:block;width:22px;height:22px}
.mobile-drawer{display:none;position:fixed;top:var(--header-height);left:0;right:0;height:calc(100dvh - var(--header-height));max-height:calc(100dvh - var(--header-height));overflow-y:auto;overscroll-behavior:contain;background:var(--panel);padding:20px var(--gutter) 40px;z-index:42;border-top:1px solid var(--border)}
.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-sm);color:var(--text)}
.mobile-drawer svg{width:18px;height:18px}
.drawer-label{margin:24px 16px 8px;color:var(--text-muted);font-size:var(--fs-small)}
.nav-veil{display:none;position:fixed;inset:var(--header-height) 0 0;background:var(--veil-bg);z-index:41;border:0}
html.nav-open{overflow:hidden}
.reveal{transition:opacity var(--time-reveal) var(--ease-out),transform var(--time-reveal) var(--ease-out)}
.reveal.pending{opacity:0;transform:translateY(16px)}
.reveal.shown{opacity:1;transform:none}
#server-status{display:block;position:relative;min-width:0;max-width:100%;overflow:hidden;margin:24px 0}
#server-status>*{min-width:0;max-width:100%}
#server-status+*{margin-top:24px}
.site-footer{padding-top:56px;padding-bottom:32px;background:var(--panel-2);border-top:1px solid var(--white-a70)}
.footer-grid{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:48px}
.footer-brand p{margin:20px 0 0;max-width:28em;color:var(--text-muted);font-size:var(--fs-small);line-height:1.8}
.footer-title{margin:0 0 16px;font-size:var(--fs-body);font-weight:var(--weight-medium)}
.footer-links{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px 20px}
.footer-links a,.footer-languages a,.footer-legal a{display:inline-flex;align-items:center;min-height:32px;text-decoration:none;font-size:var(--fs-small);color:var(--text-muted)}
.footer-links a:hover,.footer-languages a:hover,.footer-legal a:hover{color:var(--accent-dark)}
.footer-languages{display:flex;flex-wrap:wrap;gap:8px 24px;margin-top:32px;padding-top:24px;border-top:1px solid var(--border)}
.footer-languages a[aria-current="true"]{color:var(--accent-dark)}
.footer-bottom{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:16px;margin-top:24px;padding-top:24px;border-top:1px solid var(--border);font-size:var(--fs-small);color:var(--text-muted)}
.footer-bottom p{margin:0}
.footer-legal{display:flex;flex-wrap:wrap;gap:20px}
@media(max-width:1240px){
  .masthead-row{gap:20px}
  .mainnav a{padding:8px}
}
@media(max-width:1120px){
  .mainnav a{padding:9px}
  .mainnav a span{position:absolute;width:1px;height:1px;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
  .mainnav a svg{width:18px;height:18px}
}
@media(max-width:900px){
  .grid-five{grid-template-columns:repeat(3,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .footer-brand{grid-column:1/-1}
}
@media(max-width:768px){
  :root{--gutter:20px;--space-section:48px;--fs-h2:30px;--fs-h3:22px}
  h1{font-size:36px;letter-spacing:-.02em}
  .mainnav{display:none}
  .masthead-tools{margin-left:auto;gap:4px}
  .masthead-row{gap:12px}
  .menu-toggle{display:inline-flex}
  html.nav-open .mobile-drawer{display:block}
  html.nav-open .nav-veil{display:block}
  .grid-three{grid-template-columns:minmax(0,1fr)}
  .panel,.card{padding:24px}
  .ambient{max-width:100%}
}
@media(max-width:640px){
  .no-break{white-space:normal}
  .tilt,.tilt-card,[data-tilt]{transform:none}
  .grid-five{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:minmax(0,1fr)}
  .footer-brand{grid-column:auto}
  .footer-bottom{align-items:flex-start;flex-direction:column}
  .lang{padding:0 8px;font-size:12px}
  .brand-en{font-size:17px}
  .brand-logo{width:30px;height:30px}
  .brand{gap:7px}
  .login{padding:0 12px;font-size:13px}
  .login svg{display:none}
  .lang>svg{display:none}
}
@media(max-width:360px){
  :root{--gutter:16px}
  .masthead-row{gap:6px}
  .brand-en{font-size:16px}
  .brand-logo{width:26px;height:26px}
  .masthead-tools{gap:2px}
  .lang{padding:0 5px}
  .login{padding:0 10px}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition-duration:0s!important}
  .reveal,.reveal.pending{opacity:1;transform:none}
}